阅读说明：本技术 一种五阶段梯级原位地热发电系统 (Five-stage step in-situ geothermal power generation system ) 是由 李碧雄 莫思特 于 2020-12-09 设计创作，主要内容包括：一种五阶段梯级原位地热发电系统。系统由入水段、换向器、水流段、井内热伏发电模块、传热段、顶部热伏发电模块和透平发电模块构成。入水段由多跟入水管连接而成,换向器将水流段外管与内管之间的回灌水引入入水段,进而引入地下；水流段的井用潜水泵装在水流段内管正中间；井内热伏发电模块内设有相变型热伏发电基础模块和管壁型热伏发电基础模块。传热段设有磁悬浮发电段。顶部热伏发电模块顶部热伏发电模块底端与传热段连接管旋合。透平发电模块采用ORC有机朗肯发电机。本发明满足施工需求的深地原位地热发电；在原位地热发电过程中,地热水原地回灌；实现磁悬浮、透平、管壁、相变热伏、顶部热伏五阶段梯级地热发电,最大效率利用热能。(A five-stage step in-situ geothermal power generation system. The system consists of a water inlet section, a commutator, a water flow section, an in-well thermovoltaic power generation module, a heat transfer section, a top thermovoltaic power generation module and a turbine power generation module. The water inlet section is formed by connecting a plurality of water inlet pipes, and the water returning water between the outer pipe and the inner pipe of the water flow section is introduced into the water inlet section by the commutator and further introduced into the ground; the well of the water flow section is provided with a submersible pump in the middle of the inner pipe of the water flow section; and a phase-change type thermovoltaic power generation base module and a pipe wall type thermovoltaic power generation base module are arranged in the well thermovoltaic power generation module. The heat transfer section is provided with a magnetic suspension power generation section. The bottom end of the top thermovoltaic power generation module is screwed with the heat transfer section connecting pipe. The turbine power generation module adopts an ORC organic Rankine generator. The invention meets the construction requirement of deep in-situ geothermal power generation; in the in-situ geothermal power generation process, geothermal water is recharged in situ; the step geothermal power generation of five stages of magnetic suspension, turbine, pipe wall, phase change thermovoltaic and top thermovoltaic is realized, and the heat energy is utilized at the maximum efficiency.)

1. The five-stage step in-situ geothermal power generation system is characterized in that: the geothermal power generation system has five stages: magnetic suspension power generation, turbine power generation, pipe wall power generation, phase change thermovoltaic power generation and top thermovoltaic power generation;

the system consists of a water inlet section (1), a commutator (2), a water flow section (3), an in-well thermovoltaic power generation module (4), a heat transfer section (5), a top thermovoltaic power generation module (6) and a turbine power generation module (7), wherein the water inlet section, the commutator, the water flow section, the in-well thermovoltaic power generation module and the heat transfer section are all underground and are sequentially butted in sequence from deep ground to ground surface; the top thermovoltaic power generation module is partially arranged underground, partially arranged on the ground, and the turbine power generation module is arranged on the ground;

the water inlet section (1) is formed by connecting a plurality of water inlet pipes (110), one end of each water inlet pipe is processed into a water inlet external thread (112), and the other end of each water inlet pipe is processed into a water inlet internal thread (113); the external threads and the internal threads at the two ends have the same major diameter, minor diameter and thread pitch, and the adjacent water inlet pipes are connected in a screwing way through the external threads and the internal threads at the two ends to form a water inlet section with the required length; the top end interface of the water inlet section is tightly connected with the water inlet pipe connecting thread (213) of the water inlet section connecting port (210) of the commutator (2) through screwing; the lowest part of the water inlet section (1) is a recharging inlet, and the highest part of the water inlet section is a top end interface of the water inlet section; the top end interface of the water inlet section is an external thread, and the recharge inlet is an internal thread;

the commutator is formed by connecting a water inlet section connecting port (210), four recharging water communicating vessels (220-1-220-4) and a water flow section connecting interface (230); the water returning between the outer pipe and the inner pipe of the water flow section is guided to the water inlet section connecting interface by the water returning communicating device, is rotatably connected with the top end interface of the water inlet section by the water inlet section, is guided into the water inlet section and is guided into the ground from the water returning inlet by the water returning communicating device;

the water flow section (3) consists of an axial flow water pump section, a water flow section connector and a water flow section pipeline, wherein the water flow connector is connected with the adjacent water flow section pipeline and is connected into any length according to the requirement;

the axial flow water pump section consists of a water flow section inner pipe and a well submersible pump, the well submersible pump is arranged in the middle of the water flow section inner pipe, and an axial flow water pump sealing ring is sealed between a well submersible pump suction pipe and the water flow section inner pipe;

the water flow section connector consists of a water flow section outer pipe connector (350), a water flow section inner pipe connector (340) and a water flow section clamping piece;

the water flow section pipeline is composed of a water flow section inner pipe (310) and a water flow section outer pipe (320); the lengths of the inner pipe of the water flow section and the outer pipe of the water flow section are equal, and the lengths are Hn;

the underground thermovoltaic power generation module (4) is divided into an underground thermovoltaic power generation bottom end section (410), an underground thermovoltaic power generation middle section (420) and an underground thermovoltaic power generation top end section (430) from bottom to top;

a phase-change type thermovoltaic power generation base module and a pipe wall type thermovoltaic power generation base module are arranged in the well thermovoltaic power generation module 4;

the phase-change type thermovoltaic power generation base module is composed of a phase-change type thermovoltaic base module shell (401), a phase-change type thermovoltaic base module heat transfer layer (402), a phase-change type thermovoltaic power generation module (403), a phase-change type thermovoltaic base module inner layer (404) and phase-change type thermovoltaic power generation module sealing rings (405-1 and 405-2), and is provided with a phase-change type thermovoltaic power generation base module top cover;

the tube wall type thermovoltaic power generation base module is composed of a tube wall type thermovoltaic power generation base module shell (471), a tube wall type thermovoltaic power generation module (472), a tube wall type thermovoltaic power generation base module inner layer (473) and tube wall type thermovoltaic power generation base module sealing rings (474-1, 474-2):

the heat transfer section (5) comprises a heat transfer section connecting pipe (510) and a magnetic suspension power generation section;

the inner diameter of the heat transfer section connecting pipe (510) is the same as that of the inner layer of the phase-change thermovoltaic base module;

the generator (521) of the magnetic suspension power generation section is arranged in the middle of the heat transfer section connecting pipe, the generator (521) is arranged in a generator fastening bracket (532) of the generator support frame, and the supporting magnet (524) is arranged in a supporting magnet fastening bracket (542); a pipe wall support frame (531) of the generator support frame is bonded on the inner side of the heat transfer section connecting pipe; a supporting magnet pipe wall supporting frame (541) is bonded on the inner side of the heat transfer section connecting pipe;

the top thermovoltaic power generation module (6) is composed of a top thermovoltaic power generation bottom end connector, a top thermovoltaic power generation inner pipe, a top thermovoltaic power generation outer pipe connector, a top thermovoltaic power generation top cover inner layer and a top thermovoltaic power generation top cover outer layer, and the bottom end of the top thermovoltaic power generation module is screwed with the heat transfer section connecting pipe (510);

the turbine power generation module (7) is an ORC organic Rankine generator, and working media output by a working medium pump of the generator are input into a turbine working medium inflow pipe of the top thermovoltaic power generation top cover inner layer; the turbine working medium outflow pipe on the outer layer of the top thermovoltaic power generation top cover outputs the heated working medium and is connected to an expander working medium input interface of the ORC generator;

after the working medium of the ORC generator is heated by the top thermovoltaic power generation inner pipe, an expansion machine of the ORC generator is driven to work, so that the ORC generator outputs electric energy.

2. The five-stage step in situ geothermal power generation system of claim 1, wherein: the water inlet section connecting port (210) of the commutator is composed of a water inlet section connecting shell (212) and a water return connecting top cover (214);

the water inlet section connecting shell (212) is of a metal material tubular structure, the upper side is welded with a reinjection water connecting top cover (214), and the lower side is processed into a water inlet pipe connecting thread (213); the water inlet pipe connecting thread is an internal thread and is screwed with the water inlet external thread (112) of the water inlet pipe;

the recharge water connecting top cover (214) is disc-shaped, has the radius of Ra, is made of metal materials, and four recharge water communicating interfaces (211-1-211-4) with the same shape and size are uniformly distributed on the upper side; the recharge water communication interfaces (211-1-211-4) are hollow fan rings, the circle centers of the fan rings are the same as those of the recharge water connection top cover, and the central angle is slightly smaller than 90 degrees; the half inner diameter of the fan ring is R0, and the outer radius is R0; the hollowed outer edge of the recharging water communicating interface is welded with the bottom surface of the recharging water communicating device;

the four recharge water communicating vessels (220-1-220-4) are made of metal material fan ring columns, and hollow fan ring columns (223) are hollowed in the four recharge water communicating vessels; the fan ring column entity is called a main body fan ring column (224); the top surface of the main body fan-shaped column is called as the top surface (222) of the back-irrigation water communicating vessel; the bottom surface of the main body fan-shaped column is called as the bottom surface (221) of the recharge water communicating vessel;

the bottom surface (221) of the recharge water communicating vessel is welded with a recharge water connecting top cover (214), and recharge water communicating interfaces (211-1-211-4) are aligned with the hollow fan ring column (223) during welding; the top surface (222) of the recharge water communicating vessel and the water flow section connecting interface (230) are welded by a water flow section interface bottom plate (234), and a central fan ring column (223) is aligned with water flow section recharge water inlets (233-1-233-4) of the water flow section interface bottom plate (234) during welding; the recharge water flows in from the recharge water inlet (233-1-233-4) of the water flow section, flows through the hollow fan-ring column (223), flows out from the bottom surface of the recharge water communicating vessel and flows into the water inlet pipe through the recharge water communicating interface (211-1-211-4);

the inner circle radius and the outer circle radius of the cross section of the hollow fan ring column (223) are equal to those of the recharge water communication interfaces (211-1-211-4), and are R0 and R0 respectively; the outer circle radius of the cross section fan ring of the main body fan ring column (224) is R1, and the inner circle radius is R1; then R1 is greater than R0, R1 is less than R0; the central angle of the cross section of the main fan ring column (224) is larger than that of the cross section of the hollow fan ring column (223);

the water flow section connecting interface (230) is composed of a water flow section interface bottom plate (234), a water flow section outer pipe interface (231) and a water flow section inner pipe interface (232), and the water flow section interface bottom plate (234), the water flow section outer pipe interface (231) and the water flow section inner pipe interface (232) are all made of metal materials; the water flow section outer pipe connector and the water flow section inner pipe connector are welded on the water flow section connector bottom plate, and the welding positions are sealed;

the water flow section joint bottom plate (234) is disc-shaped, the radius of the disc is the same as that of the reinjection water connecting top cover (214), the disc is Ra, and the disc is made of metal materials; four hollowed water flow section recharging water inlets (233-1-233-4) are uniformly distributed on the upper side; the shape and the size of the four water flow section recharging water inlets are the same as those of the recharging water communicating interface of the recharging water connecting top cover, and the hollowed position is also the same as that of a recharging water communicating device (211-1-211-4) of the recharging water connecting top cover;

the lower edge of the water flow section interface bottom plate (234) is welded with a water recharging communicating vessel; ensuring that the reinjection water inlets of the four water flow sections are aligned with the annular columns of the emptying sectors of the reinjection water communicating device during welding;

the outermost side of the water flow section joint bottom plate is a welding position of a water flow section outer pipe joint (231), and the welding position (235) is used for welding the water flow section outer pipe joint; the middle of the water flow section joint bottom plate is hollowed into a circular shape, the hollowed area is called as a water flow section hot water inlet (244), and the radius of the water flow section hot water inlet is r 2; the outer side of the water flow section hot water inlet (244) is provided with a water flow section inner pipe interface (232) welding part (236);

the water flow section outer pipe joint (231) is of a metal tubular structure, the outer radius of the water flow section outer pipe joint is the same as the radius of a water flow section joint bottom plate (234), the outer radius is Ra, the inner radius is R6, and the inner radius R6 is larger than the outer radius R1 of the cross section of the recharge water communicating vessel; the lower side of the water flow section is welded with a water flow section joint bottom plate, the upper side of the water flow section joint bottom plate is processed into an internal thread which is called as a water flow section outer pipe joint internal thread (237), and the water flow section outer pipe is screwed with the water flow section outer pipe through the internal thread; setting the height of the interface of the outer pipe of the water flow section as H1; the height of the internal thread of the water flow section outer pipe connector is H2, the small diameter of the internal thread is 2r4, and r4 is larger than the inner radius r6 of the water flow section outer pipe connector;

the water flow section inner pipe joint (232) is of a metal tubular structure, the inner radius of the water flow section inner pipe joint is the same as the radius of a geothermal water inlet (244) on a water flow section joint bottom plate (234), the radius is r2, the outer radius is r5, and the outer radius r5 is smaller than the inner circle radius r0 of a water flow section recharging water inlet; the lower side of the water flow section is welded with the water flow section interface bottom plate, the upper side of the water flow section interface bottom plate is processed into external threads, namely water flow section inner pipe interface external threads (239), and the water flow section inner pipe interface external threads are screwed with the water flow section inner pipe through the external threads; the height of the interface of the inner pipe of the water flow section is the same as that of the interface of the outer pipe of the water flow section, and is H1; the height of the water flow section inner pipe connector external thread (239) is the same as that of the water flow section outer pipe connector internal thread (237), namely H2, the major diameter of the water flow section inner pipe connector external thread is 2r3, and r3 is smaller than the water flow section outer pipe connector external radius r 5.

3. The five-stage step in situ geothermal power generation system of claim 1, wherein: the water flow section (3) is composed of a water flow section pipeline, a water flow section connector and an axial flow water pump section, wherein the water flow section pipeline is composed of a water flow section inner pipe (310) and a water flow section outer pipe (320); the water flow section connector comprises a water flow section outer pipe connector (350), a water flow section inner pipe connector (340) and water flow section clamping pieces (330-1-330-4), and the axial flow water pump section comprises a water flow section inner pipe and a submersible pump (361) for a well;

the lengths of the inner pipe (310) of the water flow section and the outer pipe of the water flow section are equal, and the lengths are Hn; the inner pipe of the water flow section is of a tubular structure and is made of a material with low heat conductivity coefficient and high elastic modulus; the inner radius of the inner pipe of the water flow section is the same as the inner radius of a connector (232) of the inner pipe of the water flow section and is r 2; the outer radius of the inner pipe of the water flow section is the same as the outer radius of a connector (232) of the inner pipe of the water flow section and is r 5; the two ends of the inner pipe of the water flow section are processed into internal threads (311-1 and 311-2) which are matched with the external threads (239) of the interface of the inner pipe of the water flow section; the water flow section inner pipe at the lowest edge is screwed with the water flow section inner pipe interface external thread through the water flow section inner pipe internal thread to form a whole;

the outer pipe (320) of the water flow section is of a tubular structure and is made of metal materials; the inner radius of the outer pipe of the water flow section is the same as the inner radius of a connector (231) of the outer pipe of the water flow section and is r 6; the outer radius of the outer pipe of the water flow section is the same as the outer radius of the interface (231) of the outer pipe of the water flow section and is Ra; the two ends of the outer pipe of the water flow section are processed into outer pipe external threads (321-1, 321-2) of the water flow section, and the outer pipe external threads are matched with the outer pipe interface internal threads (237) of the water flow section; the water flow section outer pipe at the lowest side is screwed with the water flow section outer pipe interface inner thread (237) through the water flow section outer pipe outer thread to form a whole;

the water flow section clamping piece of the water flow section connector consists of a water flow section outer pipe clamping piece (331), an inner pipe and outer pipe positioning piece (332) and a water flow section inner pipe clamping piece (333); the water flow section clamping piece is used for fixing the axis between the water flow section outer pipe connector and the water flow section inner pipe connector;

the water flow section outer pipe clamping piece, the inner pipe and outer pipe positioning piece and the water flow section inner pipe clamping piece are all made of metal materials; the outer tube clamping and fixing sheet (331) is in a column shape with an arc section, and the height of the column shape is h 1; the radius of the arc is larger than the inner radius r6 of the inner radius of the outer pipe of the water flow section and is slightly smaller than r 4; the inner tube clamping and fixing sheet (333) is in a column shape with an arc section, and the height of the column shape is h 1; the radius of the arc is larger than r3 and is slightly smaller than the outer radius r5 of the inner pipe of the water flow section; the outer pipe clamping and fixing sheet and the inner pipe clamping and fixing sheet are respectively welded on the two sides of the inner pipe positioning sheet and the outer pipe positioning sheet (332), so that the inner pipe positioning sheet, the outer pipe clamping and fixing sheet and the inner pipe clamping and fixing sheet are integrated;

the water flow section inner pipe connector (340) is connected with adjacent water flow section inner pipes, is tubular and is made of a material with low heat conductivity coefficient and high elastic modulus; the inner radius of the pipe connector in the water flow section is the same as the inner radius of an interface (232) of an inner pipe in the water flow section, and is r 2; the outer radius of the inner pipe connector of the water flow section is the same as the outer radius of an inner pipe connector (232) of the water flow section and is r 5; the two ends of the water flow section inner pipe connector are processed into water flow section inner pipe connector external threads (341-1 and 341-2) which are matched with the water flow section inner pipe internal threads (311-1 and 311-2); the height of the external thread of the inner pipe connector of the water flow section is equal to the height of the internal thread of the outer pipe connector of the water flow section, and is H2, and the major diameter of the external thread of the inner pipe connector of the water flow section is 2r 3;

a water flow section inner pipe connector support body (342) is arranged between the outer threads of the water flow section inner pipe connectors at the two ends; if the height of the inner pipe connector support body is h3, h3 is greater than the height h1 of the water flow section clamp fastener;

four water flow section inner pipe clamping grooves (343-1-343-4) are uniformly distributed on the water flow section inner pipe connector support body (342) and are used for embedding water flow section clamping pieces; the water flow section inner pipe clamping groove is hollowed out according to the shape of the water flow section inner pipe clamping piece (333);

the water flow section outer pipe connector (350) is used for connecting adjacent water flow section outer pipes and is a metal tubular body; the inner radius of the water flow section outer pipe connector is the same as the inner radius of the water flow section outer pipe connector (231), and is r 6; the outer radius of the water flow section outer pipe connector is the same as that of the water flow section outer pipe connector (231), and is Ra; the two ends of the water flow section outer pipe connector are processed into water flow section outer pipe connector internal threads (351-1, 351-2) which are matched with the water flow section outer pipe external threads (321-1, 321-2); the height of the internal thread of the water flow section outer pipe connector is equal to the height of the internal thread of the water flow section outer pipe connector (231), the height is H2, and the small diameter of the internal thread of the water flow section outer pipe connector is 2r 4;

a water flow section outer pipe connector support body (352) is arranged between the internal threads of the water flow section outer pipe connectors at the two ends; if the height of the supporting body of the outer pipe connector is h3, h3 is greater than the height h1 of the water flow section clamping piece;

four water flow section outer pipe clamping grooves (353-1-353-4) are uniformly distributed on the water flow section outer pipe connector support body (352) and used for embedding a water flow section clamping piece; the water flow section outer pipe clamping groove is hollowed out according to the shape of the water flow section outer pipe clamping piece (331);

the axial flow water pump section is provided with a submersible pump (361) at the middle of the inner pipe of the water flow section, an axial flow water pump sealing ring is sealed between the suction pipe of the submersible pump and the inner pipe of the water flow section, and the axial flow water pump is sealed.

4. The five-stage step in situ geothermal power generation system of claim 1, wherein: the phase-change type thermovoltaic power generation base module in the well thermovoltaic power generation module (4) consists of a phase-change type thermovoltaic base module shell (401), a phase-change type thermovoltaic base module heat transfer layer (402), a phase-change type thermovoltaic power generation module (403), a phase-change type thermovoltaic base module inner layer (404), a thermovoltaic module support frame and phase-change type thermovoltaic power generation module sealing rings (405-1 and 405-2);

the shell (401) of the phase-change type thermovoltaic basic module is of a tubular structure and is made of a material with low heat conductivity coefficient and high elastic modulus; the inner radius of the shell of the phase-change thermovoltaic basic module is the same as the inner radius of the interface of the inner pipe of the water flow section, and is r 2; the outer radius of the outer shell of the phase-change thermovoltaic basic module is the same as the outer radius of the interface of the inner pipe of the water flow section, and is r 5; the lower end of the shell of the phase-change type thermovolt basic module is processed into an internal thread (406) of the phase-change type thermovolt basic module; the upper end of the shell of the phase-change thermovoltaic foundation module is processed into an external thread (407) of the phase-change thermovoltaic foundation module, and the specification of the external thread is the same as that of an external thread (239) of an inner pipe interface of the water flow section; the internal thread of the phase-change type thermovoltaic foundation module is matched with the external thread of the phase-change type thermovoltaic foundation module, so that the shells of the adjacent thermovoltaic foundation modules are screwed to form a tubular structure; the height of the internal thread of the phase-change type thermovoltaic basic module and the external thread of the phase-change type thermovoltaic basic module is H2; the height of the phase-change type thermovoltaic basic module shell is Hn + H3+ H2;

the phase-change type thermovoltaic base module heat transfer layer (402) is arranged on the inner side of the shell of the phase-change type thermovoltaic base module and is of a metal tubular structure, the outer diameter of the phase-change type thermovoltaic base module heat transfer layer is the same as the inner diameter of the shell (401) of the phase-change type thermovoltaic base module, the height of the phase-change type thermovoltaic base module heat transfer layer is slightly smaller than Hn, the upper end of the phase-change type thermovoltaic base; a plurality of hollowed heat transfer water flow holes (451-1, 451-2, 451-i) are formed in the pipe wall of the heat transfer layer of the phase-change thermovoltaic base module;

the phase-change type thermovoltaic power generation module (403) is composed of a plurality of thermoelectric power generation chips; the cold end of the thermoelectric power generation chip is welded on the outer side of the inner layer (404) of the phase-change type thermovoltaic basic module, and the hot end of the thermoelectric power generation chip is welded on the inner side of the heat transfer layer (402) of the phase-change type thermovoltaic basic module; the thermoelectric generation chips are aligned in the horizontal direction and the vertical direction, and the thermoelectric generation chips are arranged in rows in the horizontal direction and in columns in the vertical direction; the number of the thermoelectric generation chips in each row is the same, and the number of the thermoelectric generation chips in each column is the same; the thermoelectric generation chips in each row are connected in series; after the thermoelectric generation chips of each row are connected in series, the output power lines of each row are connected in parallel; forming a power supply output end of the thermovoltaic power generation basic module;

the upper end and the lower end of the phase-change type thermovoltaic power generation module are provided with phase-change type thermovoltaic power generation module sealing rings (405-1 and 405-2) which are embedded between a phase-change type thermovoltaic base module heat transfer layer (402) and a phase-change type thermovoltaic base module inner layer (404) to seal the phase-change type thermovoltaic power generation module;

the phase-change type thermovoltaic base module inner layer (404) is of a tubular structure, is made of metal materials and has the height of Hn + h 3; the lower end of the heat transfer layer is flush with the lower end of the heat transfer layer of the thermovoltaic base module; setting the inner diameter of the inner layer of the phase-change type thermovoltaic basic module as Dn and the outer diameter as Dn;

processing the pipe wall on the inner side of the lower end to form a circular truncated cone shape with the diameter of the upper bottom surface Dn, the diameter of the lower bottom surface Dn and the height of hn, which is called a thermovoltaic base module inner layer lower bevel opening (408); processing the pipe wall on the outer side of the upper end to form a circular truncated cone shape with the diameter of the upper bottom surface Dn, the diameter of the lower bottom surface Dn and the height of hn, which is called as an upper bevel opening (409) of the inner layer of the thermovoltaic base module;

the thermovoltaic module support frame is composed of a thermovoltaic module support frame main body (461) and four thermovoltaic module support frame side lugs (462-1-462-4), and is made of metal materials; the shape of the side lug of the thermovoltaic module support frame is the same as that of the water flow section clamping piece, and the thermovoltaic module support frame is symmetrically welded on the outer side of the thermovoltaic module support frame main body; the main body of the thermovoltaic module support frame is of a tubular structure, and the height of the thermovoltaic module support frame is h 1; the thermovoltaic support frame is used for limiting the distance between the phase-change type thermovoltaic power generation base module or the pipe wall type thermovoltaic power generation module and the outer pipe of the water flow section and is matched with the outer pipe connector of the water flow section for use;

the tube wall type thermovoltaic power generation base module shell (471) is of a metal tubular structure, the inner radius of the tube wall type thermovoltaic power generation base module shell is the same as that of the water flow section inner tube connector (232), and r2 is obtained; the outer radius is the same as the outer radius of the water flow section inner pipe connector (232) and is r 5; the lower end of the water flow section is processed into a pipe wall type thermovoltaic power generation base module shell internal thread (475) which is matched with a water flow section inner pipe interface external thread (239); the upper end of the shell is processed into a pipe wall type thermovoltaic power generation basic module shell external thread (476); the internal threads (475) of the shell of the tube wall type thermovoltaic power generation base module are matched with the external threads (476) of the shell of the tube wall type thermovoltaic power generation base module, and a plurality of tube wall type thermovoltaic power generation base module shells are screwed to form a tubular structure; the height of the internal thread (475) of the tube wall type thermovoltaic power generation base module and the external thread (476) of the tube wall type thermovoltaic power generation base module is H2; the height of the shell of the tube wall type thermovoltaic power generation base module is Hn + H3+ H2;

the tube wall type thermovoltaic power generation module (472) is composed of a plurality of thermoelectric power generation chips; the cold end of the thermoelectric generation chip is welded on the inner side of the shell of the tube wall type thermovoltaic generation base module, and the hot end of the thermoelectric generation chip is welded on the outer side of the inner layer of the tube wall type thermovoltaic generation base module; the thermoelectric generation chips are aligned in the horizontal direction and the vertical direction, and the thermoelectric generation chips are arranged in rows in the horizontal direction and in columns in the vertical direction; the number of the thermoelectric generation chips in each row is the same, and the number of the thermoelectric generation chips in each column is the same; the thermoelectric generation chips in each row are connected in series; after the thermoelectric generation chips of each row are connected in series, the output power lines of each row are connected in parallel; forming a power supply output end of the tube wall type thermovoltaic power generation basic module;

the upper end and the lower end of the pipe wall type thermovoltaic power generation module are provided with pipe wall type thermovoltaic power generation base module sealing rings (474-1 and 474-2) which are embedded into the middle of the shell of the pipe wall type thermovoltaic power generation base module and the inner layer of the pipe wall type thermovoltaic power generation base module to seal the pipe wall type thermovoltaic power generation module;

the inner layer (473) of the tube wall type thermovoltaic power generation base module is of a metal tubular structure, and the height of the inner layer is Hn + h 3; the upper end of the tube wall type thermovoltaic power generation base module is flush with the shell of the tube wall type thermovoltaic power generation base module; the outer diameter is r2 minus 2 times of the thickness of the tube wall type thermovoltaic power generation module;

the top cover of the phase-change thermovoltaic power generation base module is formed by combining an outer top cover ring (481), an inner top cover ring (482) and a top cover top plate (483); the outer ring of the top cover and the inner ring of the top cover are equal in height; the top cover outer ring, the top cover inner ring and the top cover top plate are all made of materials with low heat conductivity coefficient and high elastic modulus;

the outer ring of the top cover is of a tubular structure, the inner diameter and the outer diameter of the outer ring of the water flow section are the same as those of the outer pipe of the water flow section, and the lower end of the outer ring of the top cover is processed into an outer thread (484) of the outer ring of the top cover; the specification of the external thread of the outer ring of the top cover is the same as that of the external thread of the outer pipe of the water flow section;

the top cover inner ring (482) is of a tubular structure, the inner diameter and the outer diameter of the top cover inner ring are the same as those of the inner diameter and the outer diameter of the inner layer (404) of the phase-change thermovoltaic base module, and the shape of the lower end of the top cover inner ring is the same as that of a lower bevel opening (408) of the inner layer of the phase-change thermovoltaic base module and is called as a top cover inner ring lower; the upper end is processed into a top cover inner ring internal thread (486);

the top cover top plate (483) is annular, the inner diameter of the top cover top plate is the same as the inner diameter of the top cover inner ring, and the outer diameter of the top cover top plate is the same as the outer diameter of the top cover outer ring; the top cover top plate is arranged on the upper side and is bonded with the top cover inner ring and the top cover outer ring to form a whole;

the external thread of the outer ring of the top cover is screwed with the connector of the outer water flow section pipe at the uppermost end, and a sealing ring is added between the lower inclined opening of the inner ring of the top cover and the upper inclined opening of the inner layer of the phase-change thermovoltaic basic module at the uppermost end to seal the inner ring.

5. The five-stage step in situ geothermal power generation system of claim 1, wherein: the lower end of a heat transfer section connecting pipe (510) in the heat transfer section (5) is processed into a heat transfer section connecting pipe external thread (511) which is matched with a top cover inner ring internal thread (486) of a top cover of the phase-change thermovoltaic power generation basic module, and the upper end of the heat transfer section connecting pipe internal thread (512) is processed into a heat transfer section connecting pipe internal thread (512) which has the same specification with the top cover inner ring internal thread (486) of the top cover of the phase-change thermovoltaic;

the magnetic suspension power generation section consists of a heat transfer section connecting pipe, a power generator, an upper magnet, a lower magnet, a supporting magnet, an impeller, a supporting magnet supporting frame and a power generator supporting frame;

a generator bearing (522) of the magnetic suspension generator section generator (521) is cylindrical and is made of a metal material with low magnetic permeability; the lower end of the bearing is provided with an impeller; an upper magnet (523) and a lower magnet (525) are arranged on a generator bearing; the upper magnet and the lower magnet are tubular, the inner diameter of the upper magnet is the same as the outer diameter of the generator bearing, the outer diameters of the upper magnet and the lower magnet are the same, the upper magnet and the lower magnet are fixedly arranged on the generator bearing, the polarity directions are up and down, the polarity directions are the same, and the upper magnet, the lower magnet and the lower magnet are the same, or the lower magnet, the upper magnet and the lower;

the supporting magnet (524) is tubular, has an inner diameter larger than the outer diameter of the bearing and smaller than the outer diameter of the upper magnet, penetrates through the bearing, is positioned between the upper magnet and the lower magnet, has a polarity direction in the vertical direction and is opposite to that of the upper magnet; the impeller (526) is arranged at the lowest edge of the generator bearing (522);

the supporting magnet support frame consists of a supporting magnet pipe wall support frame (541), a supporting magnet fastening support (542) and supporting magnet support plates (543-1-543-4); the supporting magnet pipe wall supporting frame and the supporting magnet fastening bracket are of tubular structures; the outer diameter of the supporting frame for supporting the wall of the magnet tube is the same as the inner diameter of the connecting tube of the heat transfer section, and the supporting frame is bonded on the inner side of the connecting tube of the heat transfer section; the inner diameter of the support magnet fastening bracket is the same as the outer diameter of the support magnet; the four supporting magnet supporting plates are arranged at 90 degrees and are connected with the supporting magnet pipe wall supporting frame and the supporting magnet fastening bracket to form a whole;

the generator support frame is composed of a pipe wall support frame (531), a generator fastening support frame (532) and generator support plates (533-1-533-4); the pipe wall support frame (531) and the generator fastening support frame (532) are tubular structures; the outer diameter of the pipe wall support frame (531) is the same as the inner diameter of the heat transfer section connecting pipe (510), and the pipe wall support frame is bonded on the inner side of the heat transfer section connecting pipe; the inner diameter of the generator fastening bracket (532) is the same as the outer diameter of the generator; the generator supporting plates are four and are arranged at ninety degrees, and the pipe wall supporting frame and the generator fastening support are connected to form a whole.

6. The five-stage step in situ geothermal power generation system of claim 1, wherein: in the top thermovoltaic power generation module (6), the top thermovoltaic power generation bottom end connector is formed by combining an outer layer (611) of the top bottom end connector, a middle layer (612) of the top bottom end connector, an inner layer (613) of the top bottom end connector and a bottom layer (614) of the top bottom end connector; the material with low heat conductivity coefficient and high elastic modulus is adopted for manufacturing;

the outer layer (611) of the top bottom end connector is of a tubular structure, and the inner diameter and the outer diameter of the outer layer (320) of the water flow section are the same as those of the outer layer; the upper end is processed into a top bottom outer layer internal thread (615), and the top bottom outer layer internal thread is matched with the outer pipe external threads (321-1, 321-2) of the water flow section;

the middle layer (612) of the top bottom end connector is of a tubular structure, and the inner diameter and the outer diameter of the middle layer are the same as those of the shell of the phase-change type thermovoltaic base module; the upper end is processed into a middle-layer external thread (616) at the top and the bottom; the middle-layer external thread at the bottom end of the top part is matched with the internal thread (406) of the phase-change type thermovoltaic foundation module; processing a plurality of round holes called as top bottom middle layer through flow holes (619) below the top bottom middle layer external threads;

the inner layer (613) of the top bottom end connector is of a tubular structure, and the inner diameter of the inner layer is the same as that of the inner layer of the phase-change thermovoltaic base module; the outer diameter is the same as that of the connecting pipe of the heat transfer section; the lower end is processed into a top inner layer external thread (618) and a bottom inner layer external thread, and the top inner layer external thread is matched with the internal thread (512) of the heat transfer section connecting pipe (510); the outer side of the upper end is processed into a circular truncated cone shape, called as an upper inclined opening (617) of the inner layer at the bottom end of the top part and matched with a lower inclined opening (408) of the inner layer of the phase-change thermovoltaic base module;

the bottom layer (614) of the top bottom connector is annular, the inner diameter of the bottom layer is the same as the outer diameter of the inner layer (613) of the top bottom connector, and the outer diameter of the bottom layer is the same as the outer diameter of the outer layer (611) of the top bottom connector; the top bottom end connector outer layer (611), the top bottom end connector middle layer (612) and the top bottom end connector inner layer (613) are arranged on the shaft cores, are vertical to the bottom layer of the top bottom end connector and pass through the circle center of the bottom layer of the top bottom end connector; the bottom of the top bottom end connector outer layer (611) and the bottom of the top bottom end connector middle layer (612) are bonded with the top bottom end connector bottom layer (614), and the outer side of the top bottom end connector inner layer is bonded with the top bottom end connector bottom layer;

the top thermovoltaic power generation inner pipe is composed of a top inner pipe outer shell (621), a top inner pipe heat transfer layer (622), a top inner pipe thermovoltaic power generation module (623), a top inner pipe inner layer (624) and top inner pipe thermovoltaic power generation module sealing rings (625-1 and 625-2); the structure and the material of the top inner pipe outer shell (621) are completely the same as those of the phase-change type thermovoltaic base module outer shell; the external thread at the upper end is called as the external thread (627) of the outer shell of the top inner pipe; the internal thread at the lower end is called as top inner pipe shell internal thread (626);

the structure and the material of the top inner pipe heat transfer layer (622) and the phase-change type thermovoltaic base module heat transfer layer (402) are completely the same; the top inner tube inner layer (624) is identical to the phase-change thermovoltaic base module inner layer (404) in structure and material;

the circular truncated cone shape processed on the outer side of the upper end of the inner layer (624) of the top inner tube is called an upper bevel opening (629) of the inner layer of the top inner tube, and the circular truncated cone shape processed on the inner side of the lower end is called a lower bevel opening (628) of the inner layer of the top inner tube;

the top inner pipe thermovoltaic power generation module (623) is composed of a plurality of thermoelectric power generation chips; the cold end of the thermoelectric generation chip is welded on the inner side of the heat transfer layer (622) of the top inner pipe, and the hot end of the thermoelectric generation chip is welded on the outer side of the inner layer (624) of the top inner pipe;

the thermoelectric generation chips are aligned in the horizontal direction and the vertical direction, and the thermoelectric generation chips are arranged in rows in the horizontal direction and in columns in the vertical direction; the number of the thermoelectric generation chips in each row is the same, and the number of the thermoelectric generation chips in each column is the same;

the thermoelectric generation chips in each row are connected in series; after the thermoelectric generation chips of each row are connected in series, the output power lines of each row are connected in parallel; forming a power supply output end of the thermovoltaic power generation basic module;

sealing rings (625-1, 625-2) of the top inner tube thermovoltaic power generation module are arranged at the upper end and the lower end of the top inner tube thermovoltaic power generation module and embedded between a heat transfer layer (622) of the top inner tube and an inner layer (624) of the top inner tube to seal the top inner tube thermovoltaic power generation module (623);

the top thermovoltaic power generation outer pipe and the water flow section outer pipe (320) are identical in shape and structure and are made of materials with low heat conductivity coefficient and high elastic modulus; the external threads at the two ends are called external threads of the top thermovoltaic power generation outer tube;

the top thermovoltaic power generation outer pipe connector and the water flow section outer pipe connector are the same in shape and structure and are made of materials with low heat conductivity coefficient and high elastic modulus; the internal threads at the two ends are called as the internal threads of the top thermovoltaic power generation outer pipe connector;

the top thermovoltaic power generation top cover inner layer is formed by combining a top cover inner layer outer ring (631), a top cover inner layer inner ring (632) and a top cover inner layer cover plate (633), and the top cover inner layer cover plate is provided with a turbine working medium inflow pipe (634), a phase change working medium injection pipe (635) and a phase change vacuum suction pipe (636); the top cover inner layer outer ring (631), the top cover inner layer inner ring (632), the top cover inner layer cover plate (633), the turbine working medium inflow pipe, the phase change working medium injection pipe and the phase change vacuum suction pipe are made of materials with low heat conductivity coefficient and high elastic modulus;

the outer ring (631) of the inner layer of the top cover is of a tubular structure, and the inner diameter and the outer diameter of the outer ring are the same as those of the outer shell (621) of the inner pipe at the top; the lower end is processed into internal threads which are called top cover inner layer outer ring internal threads (638); the internal thread of the outer ring of the inner layer of the top cover has the same specification with the internal thread (626) of the outer shell of the inner pipe at the top;

the inner ring (632) of the inner layer of the top cover is of a tubular structure, and the inner diameter and the outer diameter of the inner ring are the same as those of the inner layer (624) of the inner pipe at the top; the inner side of the lower end is processed into a round table shape and is called as a lower bevel opening of the inner ring of the top cover inner layer; the inner ring lower bevel opening of the top cover inner layer has the same specification with the inner layer lower bevel opening (628) of the top inner tube;

the top cover inner layer cover plate (633) is disc-shaped, and the diameter of the top cover inner layer cover plate is the same as that of the top cover inner layer outer ring; the axes of the top cover inner layer outer ring and the top cover inner layer inner ring pass through the center of the top cover inner layer cover plate, and the top ends of the top cover inner layer outer ring (631) and the top cover inner layer inner ring (632) are bonded with the top cover inner layer cover plate;

a turbine working medium inflow pipe (634) is arranged between the inner side of the top cover inner layer outer ring (631) and the outer side of the top cover inner layer inner ring (632) on the top cover inner layer cover plate (633);

a phase change working medium injection pipe (635) and a phase change vacuum suction pipe (636) are arranged on the top cover inner layer cover plate (633) and on the inner side of the top cover inner layer inner ring (632);

the top thermovoltaic power generation top cover outer layer is composed of a top cover outer layer shell (641), a top cover outer layer top end (642) and a turbine working medium outflow pipe (643), and is made of materials with low heat conductivity coefficient and high elastic modulus;

the outer shell (641) of the top cover outer layer is of a tubular structure, and the inner diameter and the outer diameter of the outer shell are the same as those of the top thermovoltaic power generation outer tube; the lower end is processed into an external thread which is called a top cover outer layer external thread (644); the external thread of the outer layer of the top cover has the same specification with the external thread of the top thermovoltaic power generation outer tube; the top end of the outer layer of the top cover is in a circular ring shape, the outer diameter of the top cover is the same as the outer diameter of the outer shell of the outer layer of the top cover, and the inner diameter of the top cover is slightly smaller than the outer diameter of the outer ring of the inner layer of the top cover; the upper end of the outer shell of the top cover is bonded with the lower edge of the top end of the outer layer of the top cover, and the axle center of the outer shell of the top cover passes through the circle center of the top end of the outer layer of the top cover during bonding; the turbine working medium outflow pipe (643) is arranged on the top end of the outer layer of the top cover and is positioned on the inner side of the outer shell of the top cover.

7. The five-stage step in situ geothermal power generation system of claim 1, wherein: the turbine working medium flow passage of the turbine power generation module ORC generator is as follows:

turbine working medium output by a working medium pump of the turbine power generation module ORC generator flows in from a turbine working medium inflow pipe (634) of the top thermovoltaic power generation top cover inner layer, flows through a top inner pipe heat transfer layer (622) of each top thermovoltaic power generation inner pipe, reaches the inner side of a top bottom end connector middle layer (612) of the top thermovoltaic power generation bottom end connector, flows to the outer side of the top bottom end connector middle layer (612) through a top bottom end middle layer through hole (619), flows to a turbine working medium outflow pipe (643) along the inner side of the top thermovoltaic power generation outer pipe, and then flows into an expander working medium input interface of the OR.

8. The five-stage step in situ geothermal power generation system of claim 3, wherein: the installation and connection relationship of the water flow section (3) is as follows:

(1) the lower end of the axial flow water pump section is screwed with a water flow section inner pipe interface (232) of a water flow section connecting interface (230); the lower end of the outer pipe of the bottommost water flow section is screwed with a water flow section outer pipe connector (231) of the water flow section connecting connector (230);

(2) the upper end of the axial flow water pump section is screwed with a water flow section inner pipe connector (340), the upper end of the bottommost water flow section outer pipe is screwed with a water flow section outer pipe connector (350), and four water flow section clamping pieces are embedded between the water flow section inner pipe connector and the water flow section outer pipe connector;

(3) the lower end of the inner pipe (310) of the bottommost water flow section is screwed with the inner pipe connector (340) of the water flow section; the lower end of the outer pipe (320) of the water flow section at the secondary bottom end is screwed with the pipe connector (350) of the water flow section;

(4) the upper end of the inner pipe of the water flow section is screwed with the connector of the inner pipe of the water flow section; the upper end of the outer pipe of the water flow section is screwed with the connector of the outer pipe of the water flow section; four water flow section clamping pieces are embedded between the water flow section inner pipe connector and the water flow section outer pipe connector;

(5) the lower end of the inner pipe of the next water flow section is screwed with the pipe connector in the water flow section; the lower end of the outer pipe of the next water flow section is screwed with the connector of the outer pipe of the water flow section;

(6) the upper end of the inner pipe of the water flow section is screwed with the inner pipe connector of the next water flow section; the upper end of the outer pipe of the water flow section is screwed with the outer pipe connector of the next water flow section; and (5) embedding four water flow section clamping pieces between the water flow section inner pipe connector and the water flow section outer pipe connector, repeating the steps (5) and (6), and connecting the water flow section inner pipe and the water flow section outer pipe with required lengths according to the requirements.

9. The five-stage step in situ geothermal power generation system of claim 6, wherein: the top thermovoltaic power generation module has the following connection relationship among the components:

(1) the external thread (618) on the inner layer of the top bottom end of the top thermovoltaic power generation bottom end connector is screwed with the internal thread (512) of the heat transfer section connecting pipe on the top edge;

(2) the internal thread (626) of the outer shell of the top inner tube of the top thermovoltaic power generation inner tube is screwed with the external thread (616) of the middle layer of the top bottom end of the top thermovoltaic power generation bottom end connector, and when the top inner tube and the top thermovoltaic power generation inner tube are screwed, a sealing ring is added between the lower inclined opening (628) of the inner layer of the top inner tube and the upper inclined opening (617) of the inner layer of the top bottom end, so that the lower inclined opening of the inner layer of the top;

(3) the external thread of the top thermovoltaic power generation outer pipe is screwed with the internal thread (615) of the outer layer of the bottom end of the top thermovoltaic power generation bottom end connector; the top thermovoltaic power generation outer pipe connector is screwed with the top thermovoltaic power generation outer pipe at the upper end of the top thermovoltaic power generation outer pipe; a thermovoltaic module support frame is embedded in the top thermovoltaic power generation outer pipe connector;

(4) the internal thread (626) of the top inner tube shell of the next top thermovoltaic power generation inner tube is screwed with the external thread (627) of the top inner tube shell of the top thermovoltaic power generation inner tube adjacent to the lower edge; when in screwing, a sealing ring is connected between a lower bevel opening (628) of the inner layer of the top inner tube of the top thermovoltaic power generation inner tube and an upper bevel opening (629) of the inner layer of the top inner tube of the top thermovoltaic power generation inner tube adjacent to the lower bevel opening, so that the lower bevel opening of the inner layer of the top inner tube of the adjacent top thermovoltaic power generation inner tube and the upper bevel opening of the inner layer of the top inner tube are sealed

(5) The external thread of the top thermovoltaic power generation outer pipe of the next top thermovoltaic power generation outer pipe is screwed with the top thermovoltaic power generation outer pipe connector, the next top thermovoltaic power generation outer pipe connector is screwed on the top thermovoltaic power generation outer pipe, and a thermovoltaic module support frame is embedded in the top thermovoltaic power generation outer pipe connector;

(6) repeating the connection of (4) - (5) according to the required length;

(7) the inner ring outer ring (638) and the top inner tube inner ring outer ring (627) of the top thermovoltaic power generation inner tube are screwed together, and when the top thermovoltaic power generation inner ring inner;

(8) the external threads (644) of the outer layer of the top cover of the top thermovoltaic power generation top cover are screwed with the connectors of the top thermovoltaic power generation outer pipe on the uppermost edge, and sealing rings are added at the lower part of the top end of the outer layer of the top cover and the upper part of the cover plate of the inner layer of the top cover, so that the top end of the outer layer of the top cover and the cover plate of the inner layer;

(9) injecting a phase change working medium through a phase change working medium injection pipe, connecting a phase change vacuum suction pipe to a vacuum pump, and vacuumizing after injecting the phase change working medium; the phase-change working medium injection pipe and the phase-change vacuum suction pipe are sealed.

10. The five-stage step in situ geothermal power generation system of claim 4, wherein: in the in-well thermovoltaic power generation module, the connection relationship of the components of each section is as follows;

firstly, a pipe wall type thermovoltaic power generation basic module section:

assembling the tube wall type thermovoltaic power generation basic module section at the upper end of the water flow section:

(1) screwing a water flow section inner pipe connector (340) on the water flow section inner pipe at the topmost end, screwing a water flow section outer pipe connector (350) on the water flow section outer pipe at the topmost end, and embedding four water flow section clamping pieces between the water flow section inner pipe connector and the water flow section outer pipe connector;

(2) the upper end of the pipe connector in the water flow section is screwed with a pipe wall type thermovoltaic power generation base module;

(3) screwing the water flow section outer pipe on the upper end of the water flow section outer pipe connector, and screwing the water flow section outer pipe connector on the water flow section outer pipe; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(4) the upper end of the pipe wall type thermovoltaic power generation base module is screwed with the next pipe wall type thermovoltaic power generation base module;

(5) screwing the water flow section outer pipe on the upper end of the water flow section outer pipe connector, and screwing the water flow section outer pipe connector on the water flow section outer pipe; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(6) determining the number of the tube wall type thermovoltaic power generation base modules according to the required height of the tube wall type thermovoltaic power generation base module sections, and determining the times of repeating the steps (4) to (5) according to the number of the tube wall type thermovoltaic power generation base modules;

II, the lower end section of the phase-change thermovoltaic power generation base module:

phase change type thermovoltaic power generation base module lower end section is assembled at upper end of assembled pipe wall type thermovoltaic power generation base module section

(1) Manufacturing a circular truncated cone-shaped metal circular truncated cone with the diameter of Dn at the upper bottom surface, the diameter of Dn at the lower bottom surface and the height of hn, and calling the circular truncated cone-shaped metal circular truncated cone as a thermovoltaic power generation base module bottom cover;

(2) welding a bottom cover of the thermovoltaic power generation base module on a lower inclined opening (408) of an inner layer of the phase-change type thermovoltaic base module of the phase-change type thermovoltaic power generation base module at the lowest end, so that the lower end of the inner layer of the phase-change type thermovoltaic base module at the lowest end is sealed;

(3) screwing the lowest end phase-change type thermovoltaic power generation base module and the pipe wall type thermovoltaic power generation base module at the uppermost end of the pipe wall type thermovoltaic power generation base module section;

(4) screwing the outer pipe of the water flow section with the outer pipe connector of the water flow section at the uppermost end of the pipe wall type thermovoltaic power generation basic module section; and the outer pipe connector of the water flow section is screwed on the outer pipe of the water flow section;

(5) embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

thirdly, a phase-change thermovoltaic power generation basic module middle section:

the middle section of the phase-change thermovoltaic power generation basic module is arranged at the upper end of the lower end section of the phase-change thermovoltaic power generation basic module;

(1) the phase-change type thermovolt power generation base module is screwed with the phase-change type thermovolt power generation base module at the lower end section of the phase-change type thermovolt power generation base module; a sealing ring is added between the lower bevel opening (408) of the inner layer of the adjacent thermovoltaic base module and the upper bevel opening (409) of the inner layer of the thermovoltaic base module;

(2) screwing the lower end of the outer pipe of the water flow section with the outer pipe connector of the water flow section; and the outer pipe connector of the water flow section is screwed on the outer pipe of the water flow section; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(3) a sealing ring is arranged on an upper bevel opening (409) of an inner layer of the phase-change type thermovoltaic power generation base module, and the next phase-change type thermovoltaic power generation base module is screwed;

(4) the upper end of the outer pipe of the water flow section is screwed with the outer pipe of the next water flow section; screwing the outer pipe connector of the next water flow section on the outer pipe of the water flow section; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(5) determining the number of the phase-change type thermovoltaic power generation basic modules according to the required height of the middle section of the phase-change type thermovoltaic power generation basic modules, and determining the times of repeating the steps (3) to (4) according to the number of the phase-change type thermovoltaic power generation basic modules;

fourthly, a top cover of the phase-change thermovoltaic power generation basic module:

the external threads (484) of the outer ring of the top cover of the phase-change thermovoltaic power generation basic module top cover are screwed with the connector of the outer water flow section pipe at the uppermost end, and a sealing ring is added between a lower inclined opening (485) of the inner ring of the top cover and an upper inclined opening 409 of the inner layer of the phase-change thermovoltaic basic module at the uppermost end to seal the inclined openings;

fifth, heat transfer section

(1) The external thread (511) of the heat transfer section connecting pipe of the bottommost heat transfer section connecting pipe (510) is screwed with the internal thread (486) of the top cover inner ring of the top cover of the phase-change type thermovoltaic power generation basic module;

(2) according to the required length, a plurality of heat transfer section connecting pipes are screwed through the internal threads (512) of the heat transfer section connecting pipe and the external threads (511) of the heat transfer section connecting pipe to form a lower section of the heat transfer section;

(3) the lower section of the heat transfer section is screwed with the magnetic suspension power generation section;

(4) on the magnetic suspension power generation section, a plurality of heat transfer section connecting pipes (510) are screwed through heat transfer section connecting pipe internal threads (512) and heat transfer section connecting pipe external threads (511) according to the required length to form a heat transfer section upper section;

sixthly, geothermal water path:

geothermal water flows in through an geothermal water inlet (244) of the commutator, flows upwards through an inner pipe of the water flow section under the action of a well submersible pump, flows into an inner layer of a pipe wall type thermovoltaic power generation base module of the pipe wall type thermovoltaic power generation base module section, then flows through a heat transfer water flow hole of a heat transfer layer of a phase change type thermovoltaic power generation base module, flows downwards along the inner side of an outer pipe of the water flow section at the top cover of the phase change type thermovoltaic power generation base module, flows through a recharge water communicating vessel of the commutator, and flows back to the deep ground through a water inlet section.

One, the technical field

The invention relates to the field of geothermal power generation, in particular to a five-stage step in-situ geothermal power generation system.

Second, background Art

Geothermal energy is a novel clean energy source, is widely distributed and has abundant reserves. The geothermal energy is used for generating power and taking heat, the generated pollution is little, the energy sources can be regenerated, and the unit cost of the power generation and the heat taking is low. Therefore, geothermal power generation is receiving increasing attention and utilizing heat. The application number CN202010112988.6 'an in-situ geothermal power generation system', provides an in-situ geothermal power generation system, which comprises a heat pipe, a thermoelectric temperature difference power generation device and a magnetic suspension power generation device. The heat pipe is directly buried underground, the heat pipe is located at a geothermal source, on one hand, a thermoelectric temperature difference power generation device located at the lower section of the heat pipe can directly convert geothermal energy into electric energy, on the other hand, in the process that the circulating working medium is changed into a gaseous working medium, the formed upward gaseous working medium can drive a magnetic suspension power generation device located in the middle of the heat pipe, the geothermal energy is converted into mechanical energy and then converted into electric energy, and the geothermal energy-in-situ power generation device has the advantages of low energy loss, high power generation efficiency and the like. Application No.: CN201711393103.9 Integrated System for in-situ geothermal thermoelectric Power Generation device provides an integrated System for in-situ geothermal thermoelectric Power Generation device, which comprises an outermost protective layer, a highly heat conductive gel layer in the middle for heat transfer, and an innermost cold water circulation pipe. The thermoelectric device has no mechanical rotating part, has no noise during working, directly converts heat energy into electric energy, does not generate mechanical energy loss, and can generate electricity by thermoelectric conversion at different grade heat sources such as deep ground, surface hot springs and the like. Although the above applications have unique advantages, they all have the following common problems:

(1) the construction requirement of the deep geothermal well is not considered; (2) geothermal water recharge is not considered.

Third, the invention

The invention aims to provide a deep in-situ geothermal power generation system which can meet construction requirements and recharge geothermal water in situ in the in-situ geothermal power generation process aiming at the defects of the prior art.

The purpose of the invention is achieved by the following steps: the geothermal power generation system has five stages of magnetic suspension power generation, turbine power generation, pipe wall power generation, phase change thermovoltaic power generation and top thermovoltaic power generation. The system consists of a water inlet section, a commutator, a water flow section, an in-well thermovoltaic power generation module, a heat transfer section, a top thermovoltaic power generation module and a turbine power generation module. The water inlet section, the commutator, the water flow section, the in-well thermovoltaic power generation module and the heat transfer section are all underground and are sequentially butted in sequence from the deep ground to the ground surface. The top thermovoltaic power generation module is partially installed underground, partially installed on the ground, and the turbine power generation module is installed on the ground.

The water inlet section is formed by connecting a plurality of water inlet pipes, one end of each water inlet pipe is processed into a water inlet external thread, and the other end of each water inlet pipe is processed into a water inlet internal thread; the external threads and the internal threads at the two ends have the same major diameter, minor diameter and thread pitch, and the adjacent water inlet pipes are connected in a screwing way through the external threads and the internal threads at the two ends to form a water inlet section with the required length; the top end interface of the water inlet section is tightly connected with the water inlet section connecting port of the commutator through screwing. The lowest part of the water inlet section is a recharge inlet, and the highest part of the water inlet section is a top end interface of the water inlet section; the top end interface of the water inlet section is an external thread, and the recharge inlet is an internal thread.

The commutator is formed by connecting a water inlet section connecting port, four recharging water communicating vessels and a water flow section connecting interface. The water returning from the outer pipe to the inner pipe of the water flow section is led to the water inlet section connecting interface by the commutator, and is led to the water inlet section by being screwed with the top end interface of the water inlet section, and the water returning is led to the underground from the water returning inlet.

The water flow section is composed of an axial flow water pump section, a water flow section connector and a water flow section pipeline, and the water flow connector is connected with the adjacent water flow section pipelines to be connected into any length according to needs.

The axial-flow water pump section is composed of a water flow section inner pipe and a well submersible pump, the well submersible pump is arranged in the middle of the water flow section inner pipe, and an axial-flow water pump sealing ring is sealed between a well submersible pump suction pipe and the water flow section inner pipe.

The water flow section connector consists of a water flow section outer pipe connector, a water flow section inner pipe connector and a water flow section clamping and fixing piece;

the water flow section pipeline consists of a water flow section inner pipe and a water flow section outer pipe; the lengths of the inner pipe and the outer pipe of the water flow section are equal, and the length is Hn.

The in-well thermovoltaic power generation module is divided into an in-well thermovoltaic power generation bottom end section, an in-well thermovoltaic power generation middle section and an in-well thermovoltaic power generation top end section from bottom to top. And a phase-change type thermovoltaic power generation base module and a pipe wall type thermovoltaic power generation base module are arranged in the well thermovoltaic power generation module.

The phase-change type thermovoltaic power generation foundation module is composed of a phase-change type thermovoltaic foundation module shell, a phase-change type thermovoltaic foundation module heat transfer layer, a phase-change type thermovoltaic power generation module, a phase-change type thermovoltaic foundation module inner layer and a phase-change type thermovoltaic power generation module sealing ring, and is provided with a phase-change type thermovoltaic power generation foundation module top cover.

The pipe wall type thermovoltaic power generation base module is composed of a pipe wall type thermovoltaic power generation base module shell, a pipe wall type thermovoltaic power generation module, a pipe wall type thermovoltaic power generation base module inner layer and a pipe wall type thermovoltaic power generation base module sealing ring.

The heat transfer section comprises a heat transfer section connecting pipe and a magnetic suspension power generation section. The inner diameter of the heat transfer section connecting pipe is the same as the inner diameter of the phase-change thermovoltaic base module. The generator of the magnetic suspension power generation section is arranged in the middle of the heat transfer section connecting pipe, the generator is arranged in a generator fastening bracket of a generator supporting frame, and the supporting magnet is arranged on the supporting magnet fastening bracket; the pipe wall support frame of the generator support frame is bonded on the inner side of the heat transfer section connecting pipe; the supporting magnet pipe wall supporting frame is bonded on the inner side of the heat transfer section connecting pipe.

The top thermovoltaic power generation module is composed of a top thermovoltaic power generation bottom end connector, a top thermovoltaic power generation inner pipe, a top thermovoltaic power generation outer pipe connector, a top thermovoltaic power generation top cover inner layer and a top thermovoltaic power generation top cover outer layer, and the bottom end of the top thermovoltaic power generation module is screwed with the heat transfer section connecting pipe.

The turbine power generation module is an ORC organic Rankine generator, and working media output by a working medium pump of the generator are input into a turbine working medium inflow pipe in the top thermovoltaic power generation top cover inner layer; the turbine working medium outflow pipe on the outer layer of the top thermovoltaic power generation top cover outputs the heated working medium and is connected to an expander working medium input interface of the ORC generator;

after the working medium of the ORC generator is heated by the top thermovoltaic power generation inner pipe, an expansion machine of the ORC generator is driven to work, so that the ORC generator outputs electric energy.

The invention has the positive effects that:

(1) a deep in-situ geothermal power generation design scheme meeting construction requirements is provided;

(2) in the process of in-situ geothermal power generation, geothermal water is recharged in situ;

(3) the geothermal power generation has five stages in total, including magnetic suspension power generation, turbine power generation, pipe wall power generation, phase change thermovoltaic power generation and top thermovoltaic power generation; the maximum efficiency utilizes heat energy.

Description of the drawings

Fig. 1 is a schematic view of the general structure of the present invention.

FIG. 2 is a schematic view of a single water inlet pipe of the water inlet section.

Fig. 3 is a schematic view of a commutator structure.

Fig. 4 is a schematic view of the connection port of the water inlet section of the diverter.

FIG. 5 is a schematic view of the water communication interface of the diverter.

Figure 6 is a schematic view of the recharge water communication of the diverter.

Fig. 7 is a top view of the recharge water communicator.

Fig. 8 is a schematic view of a water flow section connection interface.

Fig. 9 is a schematic view of a water flow section interface base plate.

FIG. 10 is a schematic view of an outer tube interface of a water flow section.

FIG. 11 is a cross-sectional view of the outer tube interface of the water flow section.

FIG. 12 is a schematic view of an internal pipe interface of a water flow section.

FIG. 13 is a cross-sectional view of the tube interface in the flow section.

FIG. 14 is a schematic view of the inner tube of the water flow section.

FIG. 15 is a schematic view of the outer tube of the water flow section.

FIG. 16 is a schematic view of a water flow segment clamp.

FIG. 17 is a connection diagram of the water flow segment clamp, the water flow segment outer tube connector, and the water flow segment inner tube connector.

FIG. 18 is a schematic view of a water flow section internal pipe connector.

FIG. 19 is a top view of a water flow section inner tube connector support.

FIG. 20 is a schematic view of a water flow section outer tube connector.

FIG. 21 is a top view of the outer tube connector support at the water flow section.

FIG. 22 is a cross-sectional view of an axial flow water pump segment.

FIG. 23 is a schematic diagram of a three-stage structure of a thermovoltaic power generation module in a well.

Fig. 24 is a cross-sectional view of a phase-change thermovoltaic power generation base module.

Fig. 25 is a cross-sectional view of a phase-change thermovoltaic power generation base module.

FIG. 26 is a cross-sectional view of a heat transfer layer of a phase-change type thermovoltaic base module.

FIG. 27 is a schematic diagram of the phase change type thermovoltaic foundation module inner layer.

Fig. 28 is an installation cross-sectional view when the phase-change type thermovoltaic power generation base module is used.

FIG. 29 is a schematic view of a tube wall type thermovoltaic power generation base module.

FIG. 30 is a schematic diagram of a top cover structure of a phase-change thermovoltaic power generation base module.

FIG. 31 is a schematic diagram of the structure of the inner ring of the top cover of the phase-change thermovoltaic power generation base module.

FIG. 32 is a schematic diagram of the structure of the outer ring of the top cover of the phase-change thermovoltaic power generation base module.

FIG. 33 is a schematic view of a heat transfer section connecting tube.

Fig. 34 is a schematic structural diagram of a magnetic levitation generator.

Fig. 35 is a schematic diagram of a generator support frame of a magnetic levitation generator.

Figure 36 is a schematic view of a supporting magnet support frame of a magnetic levitation generator.

FIG. 37 is a schematic view of a top thermovoltaic bottom end connector.

FIG. 38 is a schematic view of the top thermovoltaic bottom end connector on the left side in cross section.

FIG. 39 is a schematic view of the right side of the top thermovoltaic power bottom connector section.

FIG. 40 is a top view, bottom view, middle layer expanded to a flat surface against the vessel wall.

FIG. 41 is a schematic view of a top thermovoltaic power generation internal tube structure.

FIG. 42 is a cross-sectional view of the inner layer of the top thermovoltaic power generation cap.

FIG. 43 is a schematic view of the top thermovoltaic power generation top cover inner layer.

FIG. 44 is a schematic view of the top thermovoltaic power generation cap outer layer.

In the figure, 1 water inlet section, 2 commutator, 3 water flow section, 4 well heat-volt power generation module, 5 heat transfer section, 6 top heat-volt power generation module, 7 turbine power generation module, 901 earth, 902 geothermal water, 110 water inlet pipe 111 water inlet pipe body, 112 water inlet external thread, 113 water inlet pipe internal thread, 210 water inlet section connecting port, 211-1, 211-2-211-3, 211-4 recharging water communicating interface, 220-1, 220-2, 220-3, 220-4 recharging water communicating device, 230 water flow section connecting interface, 231 water flow section external pipe interface, 232 water flow section internal pipe interface, 233-1, 233-2, 233-3, 233-4 water flow section recharging water inlet, 212 water inlet section connecting shell, 213 water inlet pipe connecting thread, 214 recharging water connecting top cover, 221 recharging water communicating device bottom surface, 222 recharging water communicating device top surface, 223 hollowing out a fan ring column, 224 a main body fan ring column, 234 a water flow section joint bottom plate, 235 a water flow section outer pipe joint welding part, 236 a water flow section inner pipe joint welding part, 237 a water flow section outer pipe joint inner thread, 239 a water flow section inner pipe joint outer thread, 244 a water flow section geothermal water inlet, 310 a water flow section inner pipe, 311-1, 311-2 a water flow section inner pipe inner thread, 320 a water flow section outer pipe, 321-1, 321-2 a water flow section outer pipe outer thread, 331 a water flow section outer pipe clamping piece, 332 an inner pipe positioning piece, 333 a water flow section inner pipe clamping piece, 330-1, 330-2, 330-3, 330-4 a water flow section clamping piece, 340 a water flow section inner pipe connector, 350 a water flow section outer pipe connector, 351-1, 351-2 a water flow section outer pipe connector and 352 a water flow section outer pipe connector support; 343-1, 343-2, 343-3, 343-4 water flow section inner pipe clamping groove, 353-1, 353-2, 353-3, 353-4 water flow section outer pipe clamping groove, 361 submersible axial flow pump, 362 axial flow water pump seal ring, 410 well heat volt power generation bottom end section, 420 well heat volt power generation middle section, 430 well heat volt power generation top end section, 401 phase-change heat volt base module shell, 402 phase-change heat volt base module heat transfer layer, 403 phase-change heat volt power generation module, 404 phase-change heat volt base module inner layer, 405-1, 405-2 phase-change heat volt power generation module seal ring, 406 phase-change heat volt base module internal thread, 407 phase-change heat volt base module external thread, 408 phase-change heat volt base module inner layer lower bevel opening, 409 phase-change heat volt base module inner layer upper bevel opening, 451-1, 451-2, ....451-i heat transfer water flow holes, 461 thermovoltaic module support frame main body, 462-1, 462-2, 462-3, 462-4 thermovoltaic module support frame side ear, 471 tube wall type thermovoltaic power generation base module shell, 472 tube wall type thermovoltaic power generation module, 473 tube wall type thermovoltaic power generation base module inner layer, 474-1, 474-2 tube wall type thermovoltaic power generation base module sealing ring, 475 tube wall type thermovoltaic power generation base module internal thread, 476 tube wall type thermovoltaic power generation base module external thread, 481 top cover outer ring 482, top cover inner ring, top cover top plate, 484 top cover outer ring external thread, top cover 485 inner ring lower bevel, 486 top cover inner ring internal thread, 510 heat transfer section connecting pipe, 511 heat transfer section connecting pipe external thread, 512 heat transfer section connecting pipe internal thread, 521 generator, 522 generator bearing, 523 bearing upper magnet, 483 support magnet, 525 lower magnet, 526 impeller, 531 pipe wall support frame, 532 generator fastening support frame, 533-1, 533-2, 533-3, 533-4 generator support plate, 541 support magnet pipe wall support frame, 542 support magnet fastening support frame, 543-1, 543-2, 543-3, 543-4 support magnet support plate, 611 top bottom end connector outer layer, 612 top bottom end connector middle layer, 613 top bottom end connector inner layer, 614 top bottom end connector bottom layer, 615 top bottom end outer layer internal thread, 616 top bottom end middle layer external thread, 617 top bottom end inner layer upper oblique opening, 618 top bottom end inner layer external thread, 619 top bottom end middle layer through flow void, 621 top inner pipe housing, 622 top inner pipe heat transfer layer, 623 top inner pipe thermovoltaic power generation module, 624 top inner pipe inner layer, 625-1, 625-2 top inner pipe thermovoltaic power generation module sealing ring, 626 top inner tube shell internal thread, 627 top inner tube shell external thread, 628 top inner tube inner layer lower bevel connection, 629 top inner tube inner layer upper bevel connection, 631 top cover inner layer outer ring, 632 top cover inner layer inner ring, 633 top cover inner layer cover plate, 634 turbine working medium inflow pipe, 635 phase change working medium injection pipe, 636 phase change vacuum suction pipe, 637 top cover inner layer inner ring lower bevel connection, 638 top cover inner layer outer ring internal thread, 641 top cover outer shell, 642 top cover outer top end, 643 turbine working medium outflow pipe, 644 top cover outer layer external thread.

Fifth, detailed description of the invention

The accompanying drawings show one embodiment of the present invention.

See figure 1.

The system consists of a water inlet section 1, a commutator 2, a water flow section 3, an in-well thermovoltaic power generation module 4, a heat transfer section 5, a top thermovoltaic power generation module 6 and a turbine power generation module 7, wherein the water inlet section, the commutator, the water flow section, the in-well thermovoltaic power generation module and the heat transfer section are all underground and are sequentially butted in sequence from deep ground to ground surface; the top thermovoltaic power generation module is partially installed underground, partially installed on the ground, and the turbine power generation module is installed on the ground. The step in-situ geothermal power generation of five stages, namely magnetic suspension power generation, turbine power generation, pipe wall power generation, phase-change thermovoltaic power generation and top thermovoltaic power generation geothermal power generation, is realized.

See figure 2.

The water inlet section 1 is formed by connecting a plurality of water inlet pipes 110, one end of each water inlet pipe is processed into a water inlet external thread 112, and the other end of each water inlet pipe is processed into a water inlet internal thread 113; the external threads and the internal threads at the two ends have the same major diameter, minor diameter and thread pitch, and the adjacent water inlet pipes are connected in a screwing way through the external threads and the internal threads at the two ends to form a water inlet section with the required length; the top end interface of the water inlet section is tightly connected with the water inlet section connecting port 210 of the commutator 2 through screwing. The lowest part of the water inlet section 1 is a recharge inlet, and the highest part of the water inlet section is a top end interface of the water inlet section; the top end interface of the water inlet section is an external thread, and the recharge inlet is an internal thread.

Figures 3-13 show the overall construction of the commutator.

The commutator is formed by connecting a water inlet section connecting port 210, four recharging water communicating vessels 220-1, 220-2, 220-3 and 220-4 and a water flow section connecting interface 230. The water returning from the outer pipe to the inner pipe of the water flow section is led to the water inlet section connecting interface by the commutator, and is led to the water inlet section by being screwed with the top end interface of the water inlet section, and the water returning is led to the underground from the water returning inlet.

See fig. 4 and 5. The inlet section connection port 210 of the diverter is formed by an inlet section connection housing 212 and a recharge water connection top cover 214. The water inlet section connecting shell 212 and the water return connecting top cover 214 are both made of metal materials, and stainless steel is adopted in the embodiment.

The water inlet section connecting shell 212 is of a metal material tubular structure, the upper side is welded with a recharge water connecting top cover 214, and the lower side is processed into a water inlet pipe connecting thread 213; the water inlet pipe connecting thread is an internal thread and is screwed with the water inlet external thread of the water inlet pipe;

the recharge water connecting top cover 214 is disc-shaped, has a radius of Ra, and is uniformly distributed with four recharge water communicating ports 211-1-211-4 with the same shape and size on the upper side; the recharge water communication interfaces 211-1-211-4 are hollow fan rings, the circle centers of the fan rings are the same as those of the recharge water connection top cover, and the circle center angle is slightly smaller than 90 degrees; the half inner diameter of the fan ring is R0, and the outer radius is R0; the hollowed outer edge of the recharging water communicating interface is welded with the bottom surface of the recharging water communicating device.

See fig. 6 and 7.

The four recharge water communicating vessels 220-1-220-4 are made of metal material fan ring columns, and hollow fan ring columns 223 are hollowed in the recharge water communicating vessels; the fan ring column entity is referred to as the body fan ring column 224; the top surface of the main body fan-shaped column is called as the top surface 222 of the recharge water communicating vessel; the bottom surface of the main body fan-shaped column is called as the bottom surface 221 of the back-irrigation water communicating vessel.

The bottom surface 221 of the recharge water communicating vessel is welded with the recharge water connecting top cover 214, and recharge water communicating interfaces 211-1-211-4 are aligned with the hollow fan ring column 223 during welding; the top surface 222 of the recharge water communicating vessel and a water flow section connecting interface (230) are welded by a water flow section interface bottom plate 234, and when the joint is welded, a central fan ring column 223 is aligned with water flow section recharge water inlets 233-1-233-4 of the water flow section interface bottom plate 234; the recharge water flows in from the recharge water inlets 233-1 to 233-4 of the water flow section, flows through the hollow fan-ring column 223, flows out from the bottom surface of the recharge water communicating vessel, and flows into the water inlet pipe through the recharge water communicating connectors 211-1 to 211-4.

The inner circle radius and the outer circle radius of the cross section of the hollow fan-ring column 223 are equal to those of the recharge water communication interfaces 211-1-211-4, and are R0 and R0 respectively; the outer circle radius of the cross section fan ring of the main body fan ring column 224 is R1, and the inner circle radius is R1; then R1 is greater than R0, R1 is less than R0; the central angle of the cross section of the main body sector ring column 224 is larger than that of the hollow sector ring column 223.

See fig. 8-13.

The water flow section connection interface 230 is composed of a water flow section interface bottom plate 234, a water flow section outer pipe interface 231 and a water flow section inner pipe interface 232, the water flow section interface bottom plate 234, the water flow section outer pipe interface 231 and the water flow section inner pipe interface 232 are all made of metal materials, and stainless steel is adopted in the embodiment. The water flow section outer pipe connector and the water flow section inner pipe connector are welded on the water flow section connector bottom plate, and the welding position is sealed.

The water flow section interface bottom plate 234 is disc-shaped, the radius of the disc is the same as that of the reinjection water connecting top cover 214, the disc is Ra, the disc is made of metal materials, and stainless steel is adopted in the embodiment; four water flow section reinjection water inlets 233-1, 233-2, 233-3 and 233-4 which are uniformly distributed and hollowed at the upper side; the shape and the size of the four water flow section recharging water inlets are the same as those of the recharging water communicating interface of the recharging water connecting top cover, and the hollowed positions are also the same as those of the recharging water communicating devices 211-1-211-4 of the recharging water connecting top cover. The lower side of the water flow section interface bottom plate 234 is welded with a recharging water communicating vessel; and the four water flow section recharging water inlets are ensured to be aligned with the emptying fan ring columns of the recharging water communicating device during welding.

The outermost side of the water flow section joint bottom plate is provided with a water flow section outer pipe joint 231, and a welding part 235 is used for welding the water flow section outer pipe joint; the middle of the water flow section joint bottom plate is hollowed into a circular shape, the hollowed area is called as a water flow section hot water inlet 244, and the radius of the water flow section hot water inlet is r 2; outside the flow section hot water inlet 244 is the flow section inner pipe interface 232 weld 236.

The outer radius of the water flow section outer pipe joint 231 is the same as the radius of the water flow section joint bottom plate 234, is Ra, and the inner radius is R6, so that the inner radius R6 is larger than the outer radius R1 of the cross section of the recharge water communicating vessel; the lower side of the water flow section is welded with a water flow section joint bottom plate, the upper side of the water flow section joint bottom plate is processed into an internal thread which is called as a water flow section outer pipe joint internal thread 237, and the water flow section outer pipe is screwed with the water flow section outer pipe through the internal thread; setting the height of the interface of the outer pipe of the water flow section as H1; the height of the internal thread of the water flow section outer pipe connector is H2, the small diameter of the internal thread is 2r4, and r4 is larger than the inner radius r6 of the water flow section outer pipe connector.

The inner pipe joint 232 of the water flow section is of a metal tubular structure, the inner radius of the inner pipe joint is the same as the radius of the geothermal water inlet 244 on the water flow section joint bottom plate 234 and is r2, and the outer radius is r5, so that the outer radius r5 is smaller than the inner circle radius r0 of the reinjection water inlet of the water flow section; the lower side of the water flow section is welded with the water flow section interface bottom plate, the upper side of the water flow section interface bottom plate is processed into external threads which are called as water flow section inner pipe interface external threads 239, and the water flow section inner pipe is screwed with the water flow section inner pipe through the external threads; the height of the interface of the inner pipe of the water flow section is the same as that of the interface of the outer pipe of the water flow section, and is H1; the height of the water flow section inner pipe connector external thread 239 is the same as that of the water flow section outer pipe connector internal thread 237, namely H2, and the major diameter of the water flow section inner pipe connector external thread is 2r 3.

Fig. 14-22 show the overall structure of the water flow section.

The water flow section 3 is composed of an axial flow water pump section, a water flow section connector and a water flow section pipeline, wherein the water flow connector is connected with the adjacent water flow section pipeline to form any length according to needs. Wherein, the water flow section pipeline is composed of a water flow section inner pipe 310 and a water flow section outer pipe 320. The water flow section connector is composed of a water flow section outer pipe connector 350, a water flow section inner pipe connector 340 and water flow section clamping and fixing pieces 330-1, 330-2, 330-3 and 330-4, and the axial flow water pump section is composed of a water flow section inner pipe and a well submersible pump 361.

The water flow section connector is composed of a water flow section outer pipe connector, a water flow section inner pipe connector and a water flow section clamping and fixing piece.

The lengths of the inner pipe and the outer pipe of the water flow section are equal, and the length is Hn.

The flow section pipe is composed of a flow section inner pipe 310 and a flow section outer pipe 320. The water flow section connector is composed of a water flow section outer pipe connector 350, a water flow section inner pipe connector 340 and water flow section clamping and fixing pieces 330-1, 330-2, 330-3 and 330-4, and the axial flow water pump section is composed of a water flow section inner pipe and a well submersible pump 361.

The lengths of the inner pipe 310 of the water flow section and the outer pipe of the water flow section are equal, and the lengths are Hn; the inner pipe of the water flow section is of a tubular structure and is made of a material with low heat conductivity coefficient and high elastic modulus; the inner radius of the inner pipe of the water flow section is the same as the inner radius of the connector 232 of the inner pipe of the water flow section, and is r 2; the outer radius of the inner pipe of the water flow section is the same as the outer radius of the connector 232 of the inner pipe of the water flow section, and is r 5; the two ends of the inner pipe of the water flow section are processed into internal threads, called as inner threads 311-1 and 311-2 of the inner pipe of the water flow section, and matched with the outer threads 239 of the interface of the inner pipe of the water flow section; the water flow section inner pipe at the bottommost side is screwed with the water flow section inner pipe connector external thread through the water flow section inner pipe internal thread to form a whole.

The outer pipe 320 of the water flow section is of a tubular structure and is made of metal materials; the inner radius of the outer pipe of the water flow section is the same as the inner radius of the joint 231 of the outer pipe of the water flow section, and is r 6; the outer radius of the outer pipe of the water flow section is the same as the outer radius of the joint 231 of the outer pipe of the water flow section, and is Ra; the two ends of the outer pipe of the water flow section are processed into outer threads 321-1 and 321-2 of the outer pipe of the water flow section, and the outer threads are matched with the inner threads 237 of the outer pipe connector of the water flow section; the outer pipe of the water flow section at the lowest side is screwed with the inner thread 237 of the joint of the outer pipe of the water flow section through the outer thread of the outer pipe of the water flow section to form a whole.

The water flow section clamping piece of the water flow section connector consists of a water flow section outer pipe clamping piece 331, an inner and outer pipe positioning piece 332 and a water flow section inner pipe clamping piece 333; the water flow section clamping piece is used for fixing the axis between the water flow section outer pipe connector and the water flow section inner pipe connector. The water flow section outer pipe clamping piece, the inner pipe and outer pipe positioning piece and the water flow section inner pipe clamping piece are all made of metal materials; the outer tube clamping piece 331 is columnar with an arc-shaped section, and the columnar height is h 1; the radius of the arc is larger than the inner radius r6 of the inner radius of the outer pipe of the water flow section and is slightly smaller than r 4; the inner tube clamping sheet 333 is in a column shape with an arc section, and the height of the column shape is h 1; the radius of the arc is larger than r3 and is slightly smaller than the outer radius r5 of the inner pipe of the water flow section; the inner and outer tube positioning pieces 332 are welded with the outer tube fixing piece and the inner tube fixing piece respectively at two sides, so that the inner and outer tube positioning pieces, the outer tube fixing piece and the inner tube fixing piece are integrated.

See fig. 18, 19.

The inner pipe of the water flow section adjacent to the pipe connector 340 in the water flow section is tubular and is made of a material with low heat conductivity coefficient and high elastic modulus; the inner radius of the water flow section inner pipe connector is the same as the inner radius of the water flow section inner pipe connector 232 and is r 2; the outer radius of the inner pipe connector of the water flow section is the same as the outer radius of the inner pipe connector 232 of the water flow section, and is r 5; the two ends of the water flow section inner pipe connector are processed into water flow section inner pipe connector external threads 341-1 and 341-2 which are matched with the water flow section inner pipe internal threads 311-1 and 311-2; the height of the external thread of the inner pipe connector of the water flow section is equal to the height of the internal thread of the outer pipe connector of the water flow section, and is H2, and the major diameter of the external thread of the inner pipe connector of the water flow section is 2r 3. A water flow section inner pipe connector support body 342 is arranged between the outer threads of the water flow section inner pipe connectors at the two ends; if the height of the inner pipe connector support is h3, h3 is greater than the height h1 of the water flow section clamp.

Four water flow section inner pipe clamping grooves 343-1, 343-2, 343-3 and 343-4 are uniformly distributed on the water flow section inner pipe connector support body 342 and are used for embedding a water flow section clamping piece; the water flow section inner pipe clamping groove is hollowed out according to the shape of the water flow section inner pipe clamping piece 333.

See fig. 20, 21.

The water flow section outer pipe connector 350 is used for connecting adjacent water flow section outer pipes and is a metal tubular body; the inner radius of the water flow section outer pipe connector is the same as the inner radius of the water flow section outer pipe connector 231 and is r 6; the outer radius of the water flow section outer pipe connector is the same as the outer radius of the water flow section outer pipe connector 231 and is Ra; the two ends of the water flow section outer pipe connector are processed into water flow section outer pipe connector internal threads 351-1 and 351-2 which are matched with the water flow section outer pipe external threads 321-1 and 321-2; the height of the internal thread of the water flow section outer pipe connector is equal to the height of the internal thread of the water flow section outer pipe connector 231, the height is H2, and the small diameter of the internal thread of the water flow section outer pipe connector is 2r 4.

A water flow section outer pipe connector support 352 is arranged between the internal threads of the water flow section outer pipe connectors at the two ends; if the height of the support body of the outer pipe connector is h3, h3 is greater than the height h1 of the water flow section clamp.

Four water flow section outer pipe clamping grooves 353-1, 353-2, 353-3 and 353-4 are uniformly distributed on the water flow section outer pipe connector support body 352 and used for embedding a water flow section clamping piece; the water flow section outer pipe clamping groove is hollowed out according to the shape of the water flow section outer pipe clamping piece 331.

The axial flow water pump section is provided with a submersible pump 361 in the middle of the inner pipe of the water flow section, an axial flow water pump sealing ring is sealed between the suction pipe of the submersible pump and the inner pipe of the water flow section, and the axial flow water pump is sealed. The submersible pump for the well of the embodiment adopts a submersible pump for a 600QJR hot water well, which is manufactured by Tianjin, Inc. The cross-sectional view is shown in fig. 22.

When the device is installed, the connection relationship of the components is as follows:

(1) the lower end of the axial flow water pump section is screwed with a water flow section inner pipe interface 232 of the water flow section connecting interface 230; the lower end of the outer pipe of the bottommost water flow section is screwed with a water flow section outer pipe connector 231 of the water flow section connecting connector 230;

(2) the upper end of the axial flow water pump section is screwed with the water flow section inner pipe connector 340, the upper end of the water flow section outer pipe at the bottommost end is screwed with the water flow section outer pipe connector 350, and four water flow section clamping pieces are embedded between the water flow section inner pipe connector and the water flow section outer pipe connector;

(3) the lower end of the inner pipe 310 of the bottommost water flow section is screwed with the inner pipe connector 340 of the water flow section; the lower end of the outer pipe 320 of the secondary bottom water flow section is screwed with the outer pipe connector 350 of the water flow section;

(4) the upper end of the inner pipe of the water flow section is screwed with the connector of the inner pipe of the water flow section; the upper end of the outer pipe of the water flow section is screwed with the connector of the outer pipe of the water flow section; four water flow section clamping pieces are embedded between the water flow section inner pipe connector and the water flow section outer pipe connector;

(5) the lower end of the inner pipe of the water flow section is screwed with the pipe connector in the water flow section; the lower end of the outer pipe of the water flow section is screwed with the connector of the outer pipe of the water flow section;

(6) the upper end of the inner pipe of the water flow section is screwed with the connector of the inner pipe of the water flow section; the upper end of the outer pipe of the water flow section is screwed with the connector of the outer pipe of the water flow section; and (5) embedding four water flow section clamping pieces between the water flow section inner pipe connector and the water flow section outer pipe connector, repeating the steps (5) and (6), and connecting the water flow section inner pipe and the water flow section outer pipe with required lengths according to the requirements.

Fig. 23-32 show the overall structure of the downhole thermovoltaic power generation module 4.

The downhole thermovoltaic power generation module 4 is divided into a downhole thermovoltaic power generation bottom end section 410, a downhole thermovoltaic power generation middle section 420 and a downhole thermovoltaic power generation top end section 430 from bottom to top.

The phase-change type thermovoltaic power generation base module and the pipe wall type thermovoltaic power generation base module are arranged in the well thermovoltaic power generation module 4. The phase-change type thermovoltaic power generation base module is composed of a phase-change type thermovoltaic base module shell 401, a phase-change type thermovoltaic base module heat transfer layer 402, a phase-change type thermovoltaic power generation module 403, a phase-change type thermovoltaic base module inner layer 404, phase-change type thermovoltaic power generation module sealing rings 405-1 and 405-2, and is provided with a phase-change type thermovoltaic power generation base module top cover.

See fig. 24-26.

The phase-change type thermovoltaic power generation basic module is composed of a phase-change type thermovoltaic basic module shell 401, a phase-change type thermovoltaic basic module heat transfer layer 402, a phase-change type thermovoltaic power generation module 403, a phase-change type thermovoltaic basic module inner layer 404, a thermovoltaic module support frame and phase-change type thermovoltaic power generation module sealing rings 405-1 and 405-2.

The shell 401 of the phase-change thermovoltaic basic module is of a tubular structure and is made of a material with low heat conductivity coefficient and high elastic modulus; the inner radius of the shell of the phase-change thermovoltaic basic module is the same as the inner radius of the interface of the inner pipe of the water flow section, and is r 2; the outer radius of the outer shell of the phase-change thermovoltaic basic module is the same as the outer radius of the interface of the inner pipe of the water flow section, and is r 5; the lower end of the shell of the phase-change type thermovolt basic module is processed into an internal thread 406 of the phase-change type thermovolt basic module; the upper end of the phase-change type thermovoltaic base module shell is processed into a phase-change type thermovoltaic base module external thread 407; the internal thread of the phase-change type thermovoltaic foundation module is matched with the external thread of the phase-change type thermovoltaic foundation module, so that the shells of the adjacent thermovoltaic foundation modules are screwed to form a tubular structure; the height of the internal thread of the phase-change type thermovoltaic basic module and the external thread of the phase-change type thermovoltaic basic module is H2; the phase-change type thermovoltaic basic module shell has the height Hn + H3+ H2.

The phase-change type thermovoltaic base module heat transfer layer 402 is arranged on the inner side of the phase-change type thermovoltaic base module shell and is of a metal tubular structure, the outer diameter of the phase-change type thermovoltaic base module shell is the same as the inner diameter of the phase-change type thermovoltaic base module shell 401, the height of the phase-change type thermovoltaic base module shell is slightly smaller than Hn, the upper end of the phase-change type thermovoltaic base module heat transfer layer is flush with; a plurality of hollowed heat transfer water flow holes 451-1, 451-2, 451-i are formed in the wall of the heat transfer layer of the phase-change thermovoltaic base module.

See fig. 27-29.

The phase-change thermovoltaic power generation module 403 is composed of a plurality of thermoelectric power generation chips; the cold end of the thermoelectric power generation chip is welded on the outer side of the inner layer 404 of the phase-change type thermovoltaic base module, and the hot end of the thermoelectric power generation chip is welded on the inner side of the heat transfer layer 402 of the phase-change type thermovoltaic base module; the thermoelectric generation chips are aligned in the horizontal direction and the vertical direction, and the thermoelectric generation chips are arranged in rows in the horizontal direction and in columns in the vertical direction; the number of the thermoelectric generation chips in each row is the same, and the number of the thermoelectric generation chips in each column is the same; the thermoelectric generation chips in each row are connected in series; after the thermoelectric generation chips of each row are connected in series, the output power lines of each row are connected in parallel; and the power output end of the thermovoltaic power generation basic module is formed.

The upper end and the lower end of the phase-change type thermovoltaic power generation module are provided with phase-change type thermovoltaic power generation module sealing rings 405-1 and 405-2 which are embedded between a phase-change type thermovoltaic base module heat transfer layer 402 and a phase-change type thermovoltaic base module inner layer 404 to seal the phase-change type thermovoltaic power generation module.

The phase-change thermovoltaic foundation module inner layer 404 is a tubular structure, and is made of a metal material, and an aluminum alloy is adopted in this embodiment. Height Hn + h 3; the lower end of the heat transfer layer is flush with the lower end of the heat transfer layer of the thermovoltaic base module; the inner diameter of the inner layer of the phase-change type thermovoltaic basic module is Dn, and the outer diameter is Dn. The tube wall is machined on the inner side of the lower end to form a circular truncated cone shape with the diameter of the upper bottom surface Dn, the diameter of the upper bottom surface Dn and the height hn, namely a thermovoltaic foundation module inner layer lower bevel 408, on the outer side of the upper end, and the tube wall is machined to form a circular truncated cone shape with the diameter of the upper bottom surface Dn, the diameter of the upper bottom surface Dn and the height hn, namely a thermovoltaic foundation module inner layer upper bevel 409.

As shown in fig. 27 and 28, the pv module support frame is composed of a pv module support frame main body 461 and four pv module support frame side ears 462-1, 462-2, 462-3 and 462-4, which are made of metal materials; the shape of the side lug of the thermovoltaic module support frame is the same as that of the water flow section clamping piece, and the thermovoltaic module support frame is symmetrically welded on the outer side of the thermovoltaic module support frame main body; the main body of the thermovoltaic module support frame is of a tubular structure, and the height of the thermovoltaic module support frame is h 1; the thermovoltaic support frame is used for limiting the distance between the phase-change type thermovoltaic power generation base module or the pipe wall type thermovoltaic power generation module and the outer pipe of the water flow section, and is matched with the outer pipe connector of the water flow section for use.

See fig. 29. The tube wall type thermovoltaic power generation base module casing 471 is a metal tubular structure, and the inner radius of the metal tubular structure is r2, which is the same as the inner radius of the water flow section inner tube interface 232; the outer radius is the same as the outer radius of the water flow section inner pipe interface 232 and is r 5; the lower end of the water flow section is processed into a pipe wall type thermovoltaic power generation base module shell internal thread 475 which is matched with the water flow section inner pipe interface external thread 239; the upper end of the housing is machined into a pipe wall type thermovoltaic power generation base module housing external thread 476; the pipe wall type thermovoltaic power generation base module shell internal threads 475 are matched with the pipe wall type thermovoltaic power generation base module shell external threads 476, and a plurality of pipe wall type thermovoltaic power generation base module shells are screwed to form a tubular structure. The height of the pipe wall type thermovoltaic power generation base module internal thread 475 and the pipe wall type thermovoltaic power generation base module external thread 476 is H2; the height of the shell of the tube wall type thermovoltaic power generation basic module is Hn + H3+ H2.

The tube wall type thermovoltaic power generation module 472 is composed of a plurality of thermoelectric power generation chips; the cold end of the thermoelectric generation chip is welded on the inner side of the shell of the tube wall type thermovoltaic generation base module, and the hot end of the thermoelectric generation chip is welded on the outer side of the inner layer of the tube wall type thermovoltaic generation base module; the thermoelectric generation chips are aligned in the horizontal direction and the vertical direction, and the thermoelectric generation chips are arranged in rows in the horizontal direction and in columns in the vertical direction; the number of the thermoelectric generation chips in each row is the same, and the number of the thermoelectric generation chips in each column is the same; the thermoelectric generation chips in each row are connected in series. After the thermoelectric generation chips of each row are connected in series, the output power lines of each row are connected in parallel; the power output end of the tube wall type thermovoltaic power generation basic module is formed. The upper end and the lower end of the pipe wall type thermovoltaic power generation module are provided with pipe wall type thermovoltaic power generation base module sealing rings 474-1 and 474-2 which are embedded in the middle of the shell of the pipe wall type thermovoltaic power generation base module and the inner layer of the pipe wall type thermovoltaic power generation base module to seal the pipe wall type thermovoltaic power generation module.

The inner layer 473 of the tube wall type thermovoltaic power generation base module is of a metal tubular structure and has the height Hn + h 3; the upper end of the tube wall type thermovoltaic power generation base module is flush with the shell of the tube wall type thermovoltaic power generation base module; the outer diameter is r2 minus 2 times the thickness of the tube wall type thermovoltaic power generation module.

See fig. 30-32.

The top cover of the phase-change thermovoltaic power generation base module is formed by combining an outer top cover ring 481, an inner top cover ring 482 and a top cover top plate 483; the outer ring of the top cover and the inner ring of the top cover are equal in height; the top cover outer ring, the top cover inner ring and the top cover top plate are all made of materials with low heat conductivity coefficient and high elastic modulus.

The top cover outer ring 481 is of a tubular structure, the inner diameter and the outer diameter of the top cover outer ring are the same as those of the outer pipe of the water flow section, and the lower end of the top cover outer ring 481 is processed into a top cover outer ring external thread 484; the specification of the external thread of the outer ring of the top cover is the same as that of the external thread of the outer pipe of the water flow section.

The inner ring 482 of the top cover is of a tubular structure, the inner diameter and the outer diameter of the inner ring are the same as those of the inner layer of the phase-change thermovoltaic base module, and the shape of the lower end of the inner ring is the same as that of a lower bevel opening of the inner layer of the phase-change thermovoltaic base module and is called as a lower bevel opening 485 of the inner ring of the top cover; the upper end is machined into a top cap inner ring internal thread 486.

The top cover top plate 483 is annular, the inner diameter of the top cover top plate 483 is the same as the inner diameter of the top cover inner ring, and the outer diameter of the top cover top plate; the top cover top plate is arranged on the upper side and is bonded with the top cover inner ring and the top cover outer ring to form a whole.

The external thread of the outer ring of the top cover is screwed with the connector of the outer water flow section pipe at the uppermost end, and a sealing ring is added between the lower inclined opening of the inner ring of the top cover and the upper inclined opening of the inner layer of the phase-change thermovoltaic basic module at the uppermost end to seal the inner ring.

See fig. 33-36.

The heat transfer section 5 comprises a heat transfer section connecting pipe 510 and a magnetic suspension power generation section.

The lower end of the heat transfer section connecting pipe 510 is processed into a heat transfer section connecting pipe external thread 511 which is matched with a top cover inner ring internal thread 486 of the top cover of the phase-change type thermovoltaic power generation basic module, and the upper end of the heat transfer section connecting pipe internal thread 512 is processed into a heat transfer section connecting pipe internal thread which has the same specification with the top cover inner ring internal thread 486 of the top cover of the phase-change type thermovoltaic power generation.

The inner diameter of the heat transfer section connection pipe 510 is the same as the inner diameter of the phase-change type thermovoltaic base module inner layer as shown in fig. 33. The glass fiber reinforced plastic composite material is made of materials with low thermal conductivity and high elastic modulus, and the glass fiber composite material is adopted in the embodiment.

The lower end of the heat transfer section connecting pipe 510 is processed into a heat transfer section connecting pipe external thread 511 which is matched with a top cover inner ring internal thread of the top cover of the phase-change thermovoltaic power generation basic module, and the upper end of the heat transfer section connecting pipe internal thread 512 is processed into a heat transfer section connecting pipe internal thread which has the same specification as the top cover inner ring internal thread of the top cover of the phase-change thermovoltaic power generation basic module. The examples employ glass fiber composites.

The magnetic suspension power generation section is composed of a heat transfer section connecting pipe, a power generator, an upper magnet, a lower magnet, a supporting magnet, an impeller, a supporting magnet support frame and a power generator support frame. As shown in fig. 34-36.

The generator bearing 522 of the magnetic suspension generator section generator 521 is cylindrical and is made of a metal material with low magnetic permeability; the lower end of the bearing is provided with an impeller; an upper magnet 523 and a lower magnet 525 are mounted on the generator bearing; go up magnet and lower magnet and be the tubulose, the internal diameter is the same with generator bearing external diameter, and the external diameter equals, and the fastening is installed on generator bearing, and the polarity direction is upper and lower direction, and the polarity direction is the same, and north about the upper and lower north together, perhaps north about the north.

The supporting magnet 524 is tubular, has an inner diameter larger than the outer diameter of the bearing and smaller than the outer diameter of the upper magnet, penetrates through the bearing, is positioned between the upper magnet and the lower magnet, has a polarity in the up-down direction, and is opposite to the upper magnet; the impeller 526 is mounted lowermost in the generator bearing 522.

The supporting magnet support frame consists of a supporting magnet pipe wall support frame 541, a supporting magnet fastening bracket 542 and supporting magnet supporting plates 543-1, 543-2, 543-3 and 543-4; the supporting magnet pipe wall supporting frame and the supporting magnet fastening bracket are of tubular structures; the outer diameter of the supporting frame for supporting the wall of the magnet tube is the same as the inner diameter of the connecting tube of the heat transfer section, and the supporting frame is bonded on the inner side of the connecting tube of the heat transfer section; the inner diameter of the support magnet fastening bracket is the same as the outer diameter of the support magnet; the number of the supporting magnet supporting plates is four, the supporting magnet supporting plates are arranged at ninety degrees and are connected with the supporting magnet pipe wall supporting frame and the supporting magnet fastening support to form a whole.

The generator support frame is composed of a pipe wall support frame 531, a generator fastening support frame 532, generator support plates 533-1, 533-2, 533-3 and 533-4; the pipe wall support frame 531 and the generator fastening support 532 are tubular structures; the outer diameter of the tube wall support 531 is the same as the inner diameter of the heat transfer section connecting tube 510, and is bonded to the inner side of the heat transfer section connecting tube; the inner diameter of the generator fastening bracket 532 is the same as the outer diameter of the generator; the generator supporting plates are four and are arranged at ninety degrees, and the pipe wall supporting frame and the generator fastening support are connected to form a whole.

When the phase-change type thermovoltaic power generation base module is installed and connected, the external threads of the heat transfer section connecting pipe at the lowest end and the internal threads of the top cover inner ring of the top cover of the phase-change type thermovoltaic power generation base module are connected; the connecting pipes of the adjacent heat transfer sections are connected to the required length in a screwing mode. And a magnetic suspension power generation section is arranged on the middle section.

FIGS. 37-44 show the overall configuration of the top thermovoltaic power generation module.

The top thermovoltaic power generation module 6 is composed of a top thermovoltaic power generation bottom end connector, a top thermovoltaic power generation inner pipe, a top thermovoltaic power generation outer pipe connector, a top thermovoltaic power generation top cover inner layer and a top thermovoltaic power generation top cover outer layer, and the bottom end of the top thermovoltaic power generation module is screwed with the heat transfer section connecting pipe 510.

See fig. 37-40. The top thermovoltaic power generation bottom end connector is formed by combining an outer layer 611 of the top bottom end connector, a middle layer 612 of the top bottom end connector, an inner layer 613 of the top bottom end connector and a bottom layer 614 of the top bottom end connector. The material with low thermal conductivity and high elastic modulus is adopted for manufacturing, and the glass fiber composite material is adopted in the embodiment.

The outer layer 611 of the top bottom end connector is of a tubular structure, and the inner diameter and the outer diameter of the outer layer of the top bottom end connector are the same as those of the outer pipe of the water flow section; the upper end is machined into top bottom outer layer internal threads 615 which are matched with the outer pipe external threads of the water flow section.

The middle layer 612 of the top bottom end connector is of a tubular structure, and the inner diameter and the outer diameter of the middle layer are the same as those of the shell of the phase-change thermovoltaic base module; the upper end is processed into a top end middle layer external thread 616; the middle-layer external thread at the bottom end of the top part is matched with the internal thread of the phase-change type thermovoltaic foundation module; below the top bottom middle thread, round holes called top bottom middle through-flow holes 619 are machined, as shown in fig. 40.

The top bottom end connector inner layer 613 is a tubular structure with an inner diameter the same as the inner diameter of the phase change type thermovoltaic base module; the outer diameter is the same as that of the connecting pipe of the heat transfer section; the lower end is processed into a top inner layer external thread 618 which is matched with the internal thread 512 of the heat transfer section connecting pipe 510; the outer side of the upper end is processed into a circular truncated cone shape, which is called as an upper inclined opening 617 of the inner layer at the bottom of the top part and is matched with a lower inclined opening of the inner layer of the phase-change thermovoltaic foundation module.

The bottom layer 614 of the top bottom connector is annular, the inner diameter of the bottom layer 614 is the same as the outer diameter of the inner layer 613 of the top bottom connector, and the outer diameter of the bottom layer 614 of the top bottom connector is the same as the outer diameter of the outer layer 611 of the top bottom connector; the top bottom end connector outer layer 611, the top bottom end connector middle layer 612 and the top bottom end connector inner layer 613 are arranged at the centers of the top bottom end connector bottom layers in a vertical mode; the outer layer 611 of the top bottom connector and the bottom of the middle layer 612 of the top bottom connector are bonded to the bottom layer 614 of the top bottom connector, and the outer side of the inner layer of the top bottom connector is bonded to the bottom layer of the top bottom connector.

See fig. 41.

The top thermovoltaic power generation inner tube consists of a top inner tube outer shell 621, a top inner tube heat transfer layer 622, a top inner tube thermovoltaic power generation module 623, a top inner tube inner layer 624 and top inner tube thermovoltaic power generation module sealing rings 625-1 and 625-2; the top inner tube outer shell 621 is completely the same as the phase-change type thermovoltaic base module outer shell in structure and material; the external threads on the upper end are referred to as top inner tube outer shell external threads 627; the internal threads of the lower end are referred to as top inner tube housing internal threads 626.

The top inner tube heat transfer layer 622 is identical in structure and material to the phase-change type thermovoltaic base module heat transfer layer 402; top inner tube inner layer 624 is identical in structure and material to phase-change type thermovoltaic base module inner layer 404.

The truncated cone shape formed on the outer side of the upper end of the inner layer 624 of the top inner tube is called an upper bevel 629 of the inner layer of the top inner tube, and the truncated cone shape formed on the inner side of the lower end is called a lower bevel 628 of the inner layer of the top inner tube.

The top inner tube thermovoltaic power generation module 623 is composed of a plurality of thermoelectric power generation chips; the cold end of the thermoelectric generation chip is welded on the inner side of the heat transfer layer 622 of the top inner tube, and the hot end of the thermoelectric generation chip is welded on the outer side of the inner layer 624 of the top inner tube. The thermoelectric generation chips are aligned in the horizontal direction and the vertical direction, and the thermoelectric generation chips are arranged in rows in the horizontal direction and in columns in the vertical direction; the number of the thermoelectric generation chips in each row is the same, and the number of the thermoelectric generation chips in each column is the same. The thermoelectric generation chips in each row are connected in series; after the thermoelectric generation chips of each row are connected in series, the output power lines of each row are connected in parallel; and the power output end of the thermovoltaic power generation basic module is formed. The top inner tube thermovoltaic power generation module is provided with sealing rings 625-1 and 625-2 at the upper end and the lower end, and the sealing rings are embedded between the top inner tube heat transfer layer 622 and the top inner tube inner layer 624 to seal the top inner tube thermovoltaic power generation module 623.

The top thermovoltaic power generation outer pipe is the same as the water flow section outer pipe 320 in shape and structure, and is made of a material with low thermal conductivity and high elastic modulus, and the glass fiber composite material is adopted in the embodiment. The external threads at the two ends are called as external threads of the top thermovoltaic power generation outer pipe.

See fig. 42, 43.

The top thermovoltaic power generation top cover inner layer is formed by combining a top cover inner layer outer ring 631, a top cover inner layer inner ring 632 and a top cover inner layer cover plate 633, and the top cover inner layer cover plate is provided with a turbine working medium inflow pipe 634, a phase change working medium injection pipe 635 and a phase change vacuum suction pipe 636; the top cover inner layer outer ring 631, the top cover inner layer inner ring 632, the top cover inner layer cover plate 633, the turbine working medium inflow pipe, the phase change working medium injection pipe and the phase change vacuum suction pipe are made of materials with low heat conductivity coefficient and high elastic modulus, and the embodiment adopts glass fiber composite materials.

The outer ring 631 of the inner layer of the top cover is of a tubular structure, and the inner diameter and the outer diameter of the outer ring of the inner layer of the top cover are the same as those of the outer shell of the inner pipe at the top; the lower end is processed into internal threads which are called top cover inner layer outer ring internal threads 638; the internal thread of the outer ring of the inner layer of the top cover has the same specification with the internal thread of the outer shell of the inner pipe at the top. The top cover inner cover plate 633 is disc-shaped, and the diameter of the top cover inner cover plate is the same as that of the top cover inner outer ring; the axes of the top cover inner layer outer ring and the top cover inner layer inner ring pass through the circle center of the top cover inner layer cover plate, and the top ends of the top cover inner layer outer ring and the top cover inner layer inner ring are bonded with the top cover inner layer cover plate.

The turbine working medium inflow pipe 634 is arranged between the inner side of the top cover inner layer outer ring 631 and the outer side of the top cover inner layer inner ring 632 on the top cover inner layer cover plate 633. And a phase change working medium injection pipe 635 and a phase change vacuum suction pipe 636 are arranged on the top cover inner layer cover plate 633 and on the inner side of the top cover inner layer inner ring 632.

The inner ring 632 of the top cover inner layer is of a tubular structure, and the inner diameter and the outer diameter of the inner ring and the inner layer of the top inner pipe are the same; the inner side of the lower end is processed into a round table shape and is called as a lower bevel opening of the inner ring of the top cover inner layer; the inner ring lower bevel opening of the top cover inner layer has the same specification with the inner layer lower bevel opening of the top inner pipe.

See fig. 44.

The top thermovoltaic power generation top cover outer layer is composed of a top cover outer layer shell 641, a top cover outer layer top end 642 and a turbine working medium outflow pipe 643, and is made of materials with low thermal conductivity and high elastic modulus, and the top thermovoltaic power generation top cover outer layer is made of glass fiber composite materials.

The outer shell 641 of the top cover outer layer is of a tubular structure, and the inner diameter and the outer diameter of the outer shell are the same as those of the top thermovoltaic power generation outer tube; the lower end is processed into an external thread which is called a top cover outer layer external thread 644; the external thread of the outer layer of the top cover has the same specification with the external thread of the top thermovoltaic power generation outer tube; the top end of the outer layer of the top cover is in a circular ring shape, the outer diameter of the top cover is the same as the outer diameter of the outer shell of the outer layer of the top cover, and the inner diameter of the top cover is slightly smaller than the outer diameter of the outer ring of the inner layer of the top cover; the upper end of the outer shell of the top cover is bonded with the lower edge of the top end of the outer layer of the top cover, and the axle center of the outer shell of the top cover passes through the circle center of the top end of the outer layer of the top cover during bonding; the turbine working medium outlet pipe is arranged at the top end of the outer layer of the top cover and is positioned at the inner side of the outer shell of the top cover.

When the top thermovoltaic power generation top cover is installed:

(1) the external threads of the inner layer at the bottom end of the top thermovoltaic power generation bottom end connector are screwed with the heat transfer section connecting pipe at the top edge;

(2) the internal thread of the outer shell of the top inner tube of the top thermovoltaic power generation inner tube is screwed with the external thread of the middle layer of the top bottom end of the top thermovoltaic power generation bottom end connector, and when the internal thread is screwed, a sealing ring is added between the lower inclined opening of the inner layer of the top inner tube and the upper inclined opening of the inner layer of the top bottom end, so that the lower inclined opening of the inner layer of the top inner tube and the upper inclined opening of the inner layer of;

(3) the external thread of the top thermovoltaic power generation outer pipe is screwed with the internal thread of the outer layer of the bottom end of the top thermovoltaic power generation bottom end connector; the top thermovoltaic power generation outer pipe connector is screwed with the top thermovoltaic power generation outer pipe at the upper end of the top thermovoltaic power generation outer pipe; a thermovoltaic module support frame is embedded in the top thermovoltaic power generation outer pipe connector;

(4) the internal thread of the top inner tube shell of the top thermovoltaic power generation inner tube is adjacent to the external thread of the top inner tube shell of the top thermovoltaic power generation inner tube at the lower side; during screwing, a sealing ring is connected between a lower bevel opening of the inner layer of the top inner tube of the top thermovoltaic power generation inner tube and an upper bevel opening of the inner layer of the top inner tube of the top thermovoltaic power generation inner tube adjacent to the lower bevel opening, so that the lower bevel opening of the inner layer of the top inner tube of the adjacent top thermovoltaic power generation inner tube and the upper bevel opening of the inner layer of the top inner tube are sealed;

(5) the external thread of the top thermovoltaic power generation outer pipe of the next top thermovoltaic power generation outer pipe is screwed with the top thermovoltaic power generation outer pipe connector of the step (3), the next top thermovoltaic power generation outer pipe connector is screwed on the top thermovoltaic power generation outer pipe, and a thermovoltaic module support frame is embedded in the top thermovoltaic power generation outer pipe connector;

(6) repeating (4) - (5) according to the required length;

(7) the inner ring lower bevel of the inner ring of the top cover inner layer and the upper bevel of the inner layer of the top inner tube are connected with a sealing ring, so that the lower bevel of the inner ring of the top cover inner layer and the upper bevel of the inner layer of the top inner tube are sealed;

(8) the outer top cover outer layer external thread 644 of the top thermovoltaic power generation top cover outer layer is screwed with the top thermovoltaic power generation outer pipe connector on the uppermost edge, and sealing rings are added on the lower portion of the top cover outer layer top end and the upper portion of the top cover inner layer cover plate, so that the top cover outer layer top end and the top cover inner layer cover plate are sealed.

(9) Injecting a phase change working medium through a phase change working medium injection pipe, wherein methanol is adopted in the embodiment; a phase-change vacuum suction pipe is connected to a vacuum pump, and the vacuum pump is vacuumized after methanol is injected; and the pipe orifices of the phase-change material injection pipe and the phase-change vacuum suction pipe are sealed.

The turbine generation module 7 of the present embodiment is an ORC organic rankine generator, and an ORC magnetic levitation generator produced by guangzhou wine fast energy cooling and heating equipment limited company is adopted, and the model is as follows: VWTWNC.

Working medium output by a working medium pump of the generator is input into a turbine working medium inflow pipe on the inner layer of the top thermovoltaic power generation top cover; and the turbine working medium outlet pipe on the outer layer of the top thermovoltaic power generation top cover outputs the heated working medium and is connected to an expander working medium input interface of the ORC generator. After the working medium of the ORC generator is heated by the top thermovoltaic power generation inner pipe, an expansion machine of the ORC generator is driven to work, so that the ORC generator outputs electric energy.

The turbine working medium flow passage of the turbine power generation module ORC generator is as follows: the turbine working medium output by the working medium pump of the turbine power generation module ORC generator flows in from the turbine working medium inflow pipe of the top thermovoltaic power generation top cover inner layer, flows through the top inner pipe heat transfer layer of each top thermovoltaic power generation inner pipe, reaches the inner side of the middle layer of the top bottom end connector of the top thermovoltaic power generation bottom end connector, flows to the outer side of the middle layer of the top bottom end connector through the through-flow air of the middle layer of the top bottom end, flows to the turbine working medium outflow pipe along the inner side of the top thermovoltaic power generation outer pipe, and then flows.

In the embodiment, in the downhole thermovoltaic power generation module, three sections, namely a downhole thermovoltaic power generation bottom section 410, a downhole thermovoltaic power generation middle section 420 and a downhole thermovoltaic power generation top section 430, are involved, and a phase-change type thermovoltaic power generation base module and a tube wall type thermovoltaic power generation base module are provided. When the thermovoltaic power generation section is assembled, the connection relationship of each component is as follows;

firstly, a pipe wall type thermovoltaic power generation basic module section:

assembling the tube wall type thermovoltaic power generation basic module section at the upper end of the water flow section:

(1) screwing a water flow section inner pipe connector on the water flow section inner pipe at the topmost end, screwing a water flow section outer pipe connector on the water flow section outer pipe at the topmost end, and embedding four water flow section clamping pieces between the water flow section inner pipe connector and the water flow section outer pipe connector;

(2) the upper end of the pipe connector in the water flow section is screwed with a pipe wall type thermovoltaic power generation base module;

(3) screwing the water flow section outer pipe on the upper end of the water flow section outer pipe connector, and screwing the water flow section outer pipe connector on the water flow section outer pipe; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(4) the upper end of the pipe wall type thermovoltaic power generation base module is screwed with the next pipe wall type thermovoltaic power generation base module;

(5) screwing the water flow section outer pipe on the upper end of the water flow section outer pipe connector, and screwing the water flow section outer pipe connector on the water flow section outer pipe; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(6) and (4) determining the number of the tube wall type thermovoltaic power generation base modules according to the required height of the tube wall type thermovoltaic power generation base module sections, and determining the times of repeating the steps (4) to (5) according to the number of the tube wall type thermovoltaic power generation base modules.

II, the lower end section of the phase-change thermovoltaic power generation base module:

phase transition type thermovoltaic power generation foundation module lower extreme section assembles in equipment pipe wall type thermovoltaic power generation foundation module section upper end:

(1) manufacturing a circular truncated cone-shaped metal circular truncated cone with the diameter of Dn at the upper bottom surface, the diameter of Dn at the upper bottom surface and the height of hn, and calling the circular truncated cone-shaped metal circular truncated cone as a thermovoltaic power generation base module bottom cover; the examples use aluminum alloys.

(2) Welding a bottom cover of the phase-change type thermovoltaic base module on a lower inclined opening of an inner layer of the phase-change type thermovoltaic base module at the lowest end to seal the lower end of the inner layer of the phase-change type thermovoltaic base module;

(3) screwing the lowest end phase-change type thermovoltaic power generation base module and the pipe wall type thermovoltaic power generation base module at the uppermost end of the pipe wall type thermovoltaic power generation base module section;

(4) screwing the outer pipe of the water flow section with the outer pipe connector of the water flow section at the uppermost end of the pipe wall type thermovoltaic power generation basic module section; and the outer pipe connector of the water flow section is screwed on the outer pipe of the water flow section;

(5) and a thermovoltaic module support frame is embedded in the water flow section outer pipe connector.

Thirdly, a phase-change thermovoltaic power generation basic module middle section:

the middle section of the phase-change thermovoltaic power generation basic module is arranged at the upper end of the lower end section of the phase-change thermovoltaic power generation basic module;

(1) the phase-change type thermovolt power generation base module is screwed with the phase-change type thermovolt power generation base module at the lower end section of the phase-change type thermovolt power generation base module;

(2) installing a sealing ring on an upper inclined opening of an inner layer of the phase-change thermovoltaic basic module at the upper ends of the outer pipe of the water flow section and the lower end section of the phase-change thermovoltaic basic module, and screwing the upper end of the phase-change thermovoltaic basic module with the outer pipe connector of the water flow section; and the outer pipe connector of the water flow section is screwed on the outer pipe of the water flow section; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(3) a sealing ring is arranged on an inclined opening on the inner layer of the phase-change type thermovoltaic power generation base module, and the next phase-change type thermovoltaic power generation base module is screwed;

(4) the upper end of the outer pipe of the water flow section is screwed with the outer pipe of the next water flow section; the outer pipe connector of the water flow section is screwed on the outer pipe of the water flow section; embedding a thermovoltaic module support frame in the water flow section outer pipe connector;

(5) and (4) determining the number of the phase-change type thermovoltaic power generation basic modules according to the required middle section height of the phase-change type thermovoltaic power generation basic modules, and determining the times of repeating the steps (3) to (4) according to the number of the phase-change type thermovoltaic power generation basic modules.

Fourthly, a top cover of the phase-change thermovoltaic power generation basic module:

the external thread of the outer ring of the top cover of the phase-change thermovoltaic power generation basic module top cover is screwed with the connector of the water flow section outer pipe at the uppermost end, and a sealing ring is added between the lower inclined opening of the inner ring of the top cover and the upper inclined opening of the inner layer of the phase-change thermovoltaic basic module at the uppermost end to seal the top cover.

Five, geothermal water path

Geothermal water flows in through an geothermal water inlet 244 of the commutator, flows upwards through an inner pipe of the water flow section under the action of a well submersible pump, flows into an inner layer of a pipe wall type thermovoltaic power generation base module of the pipe wall type thermovoltaic power generation base module section, then flows through heat transfer water flow holes of a heat transfer layer of a phase change type thermovoltaic power generation base module of the phase change type thermovoltaic power generation base module, flows downwards along the inner side of an outer pipe of the water flow section at a top cover of the phase change type thermovoltaic power generation base module, flows through a recharge water communicating vessel of the commutator, and flows back to the deep ground through a water inlet section.

In the embodiment of the invention, all the thermoelectric generation chips are selected from thermoelectric generation chips produced by Hubei Sauguery New energy science and technology Limited, and the types are as follows: TEG 1-19913.

In the embodiment of the invention, the materials which are not particularly described and have low thermal conductivity and high elastic modulus are all made of glass fiber composite materials; the metal materials not specifically described are all aluminum alloys or stainless steel.

After the installation of the five-stage step in-situ geothermal power generation system is completed, the phase change working medium injection pipe is sealed after the phase change working medium injection pipe 635 inputs working media, and the phase change vacuum suction pipe is sealed after the phase change vacuum suction pipe 636 exhausts air; the input working medium is different according to the temperature of geothermal water, and can be water or ammonia, methanol, R1234ze, R245fa and the like.