阅读说明：本技术 一种盘式螺旋蒸汽涡轮机 (Disc type spiral steam turbine ) 是由 于洪涛 于 2021-09-13 设计创作，主要内容包括：一种盘式螺旋蒸汽涡轮机,属于涡轮机设备制造技术领域,包括壳体、与壳体同轴设置的上转盘和下转盘,上转盘的上表面围绕圆心设有平面螺旋形凸楞A和平面螺旋形凸楞B,平面螺旋形凸楞A和平面螺旋形凸楞B为中心对称,平面螺旋形凸楞A和平面螺旋形凸楞B相互嵌入彼此之间的间隙内,下转盘的上表面对应平面螺旋形凸楞A和平面螺旋形凸楞B设有平面螺旋形凸楞a和平面螺旋形凸楞b,中心轴壳体和上转盘与下转盘,中心轴内对应上转盘和下转盘分别设有通气装置,解决了现有的汽轮机技术不利于汽轮机的小型化应用以及现有的涡轮机在大负载下的转换效率损失。(A disk spiral steam turbine belongs to the technical field of turbine equipment manufacturing, and comprises a shell, the upper surface of the upper rotary table is provided with a plane spiral convex arris A and a plane spiral convex arris B around the circle center, the plane spiral convex arris A and the plane spiral convex arris B are centrosymmetric, the plane spiral convex arris A and the plane spiral convex arris B are embedded into a gap between the plane spiral convex arris A and the plane spiral convex arris B, the upper surface of the lower rotary table is provided with a plane spiral convex arris a and a plane spiral convex arris B corresponding to the plane spiral convex arris A and the plane spiral convex arris B, the central shaft shell, the upper rotary table and the lower rotary table are respectively provided with a ventilation device corresponding to the upper rotary table and the lower rotary table in the central shaft, and the problems that the existing steam turbine technology is not beneficial to the miniaturization application of a steam turbine and the conversion efficiency loss of the existing steam turbine under large load are solved.)

1. A disc type spiral steam turbine is characterized by comprising a circular shell (1), a circular upper rotary disc (2) and a circular lower rotary disc (3), wherein the circular upper rotary disc (2) and the circular lower rotary disc (3) are coaxially arranged with the shell (1), the upper surface of the upper rotary disc (2) is provided with a plane spiral convex arris A (4) and a plane spiral convex arris B (5) around the circle center, the plane spiral convex arris A (4) and the plane spiral convex arris B (5) are in central symmetry, the plane spiral convex arris A (4) and the plane spiral convex arris B (5) are embedded into a gap between the plane spiral convex arris A (4) and the plane spiral convex arris B (5), a gap (6) is preset between the plane spiral convex arris A (4) and the plane spiral convex arris B (5), the upper surface of the lower rotary disc (3) is provided with a plane spiral convex arris a (7) and a plane spiral convex arris B (8) corresponding to the plane spiral convex arris A (4) and the plane spiral convex arris B (5), the spiral direction of the protruding stupefied a (7) of plane spiral shape with the spiral direction of the protruding stupefied A (4) of plane spiral shape is opposite, the spiral direction of the protruding stupefied B (8) of plane spiral shape is opposite with the spiral direction of the protruding stupefied B (5) of plane spiral shape, go up the lower surface of carousel (2) with the last fixed surface of carousel (3) down is connected, go up carousel (2) go up in the gap between protruding stupefied A (4) of plane spiral shape and the protruding stupefied B (5) of plane spiral shape is inherent to be kept away from the one end in carousel (2) axle center and is equipped with and runs through go up venthole (9) of carousel (2) and carousel (3) down, go up carousel (2) and all coaxial shaft hole (10) of locating in the centre of a circle of carousel (3) down, go up carousel (2) and locate in casing (1) down, also be equipped with shaft hole (10) in the centre of a circle department of casing (1) on casing (1), the central shaft (17) penetrates through the shell (1) and the upper rotary table (2) and the lower rotary table (3) through the shaft hole (10), an air passage A (11) and an air passage B (12) are respectively arranged in the central shaft (17) corresponding to the upper turntable (2) and the lower turntable (3), one end of the air passage A (11) is communicated with the starting end of a gap (6) between the plane spiral convex edge A (4) and the plane spiral convex edge B (5), the other end of the air passage A penetrates through the side wall of the central shaft (17) which is positioned outside the shell (1), one end of the air passage B (12) is communicated with the starting end of the gap (6) between the plane spiral convex edge a (7) and the plane spiral convex edge B (8), the other end extends out of the central shaft (17), the central shaft (17) is fixedly connected with the shell (1), the upper rotary table (2) and the lower rotary table (3).

2. A disc-screw steam turbine according to claim 1, characterised in that the side walls of the flat spiral ridges a (4), B (5), a (7) and B (8) are provided with raised grains (13).

3. A disc-type helical steam turbine according to claim 1, wherein a plurality of air holes (14) communicating with the air passage a (11) are provided at both ends of the air passage a (11) on the circumferential surface of the central shaft (17), and the air passage a (11) communicates with the starting end of the gap (6) between the flat helical ridge a (4) and the flat helical ridge B (5) through the air holes (14).

4. A disc-type helical steam turbine according to claim 1, wherein a plurality of air holes (14) are provided at the starting end of the gap (6) between the flat helical ridge a (7) and the flat helical ridge B (8) on the circumferential surface of the central shaft (17), and the air passage B (12) communicates with the starting end of the gap (6) between the flat helical ridge a (7) and the flat helical ridge B (8) through the air holes (14).

5. A disc-screw steam turbine according to claim 1, characterised in that the projection of the edge of the flat spiral ridge a (4), the edge of the flat spiral ridge B (5), the edge of the flat spiral ridge a (7), the edge of the flat spiral ridge B (8) on the upper surface of the upper disc (2) has a wave (13).

6. A disc-type spiral steam turbine according to claim 1, characterized in that a gas seal bearing (15) is arranged on the central shaft (17) corresponding to the gas passage a (11), a gas passage C (6) is radially arranged on the gas seal bearing (15), one end of the gas passage C (6) close to the central shaft (17) is communicated with the gas passage a (11), and the other end extends out of the side wall of the gas seal bearing (15).

7. A disc-spiral steam turbine according to claim 4, characterized in that the end of the flue B (12) remote from the lower rotor disc (3) extends outside the central shaft (17) along the axis of the central shaft (17).

8. A disc-spiral steam turbine according to claim 7, characterized in that the central shaft (17) is provided with a bearing (18) at a section facing the lower rotor disc (3).

Technical Field

A disk spiral steam turbine belongs to the technical field of turbine equipment manufacturing.

Background

The existing steam turbine system mainly utilizes impulse generated by high-speed airflow impacting a rotating blade to realize kinetic energy conversion, and in the process, the corresponding high-speed airflow is obtained by decompression and expansion, so that the entropy value of the system is increased. And because the air flow direction and the rotating shaft of the steam turbine form an included angle of 90 degrees, the integral energy conversion stage number cannot be too much. The low grade steam formed at the end of the exhaust still has a large amount of unusable heat energy. The improvement of the conversion efficiency of the internal energy and the mechanical energy of the steam can be realized only by improving the temperature and the pressure of the front-end steam and reducing the temperature of the tail-end steam. In summary, the existing steam turbine technology is not favorable for the miniaturization application of the steam turbine;

another efficient tesla turbine requires a very small disc pitch. The steam powered model must maintain a 0.4 mm disc spacing. The disks must be maximally smooth to minimize surface friction and shear loss. The discs must also be maximally thin to prevent mutual attraction and turbulence at the edges of the discs. This type of turbine requires considerable precision in the manufacture and materials of the disks. And because no fluid channel is bound between the disks, in the process of disk rotation, steam fluid in the central shaft area can generate mutual impact friction under different flow velocities, so that local turbulence and air resistance effect are generated, and finally, the speed reduction and pressurization phenomena occur at the exhaust end of the central shaft. The greater the tesla turbine load the lower the efficiency. When the load is small, the fluid undergoes a large rotation from the inlet to the outlet, which decreases in number and becomes progressively shorter under large loads. This will increase shear losses and also reduce efficiency because there is less gas to disc contact.

Disclosure of Invention

Aiming at the defects of the prior art, the invention designs a disc type spiral steam turbine by adopting the air blast principle, namely the mode that the rotation direction is consistent with the gas flow direction, and the disc type spiral steam turbine has the characteristics of low rotating speed and high torque. The dependence on the design difficulty and the material process is small, the work-doing stages are dense, the volume diffusion ratio is small, the thermal conversion efficiency can be accurately controlled by adjusting the air inflow and the output torque, and the problems that the existing steam turbine technology is not beneficial to the miniaturization application of a steam turbine and the conversion efficiency of the existing steam turbine is reduced under a large load are solved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a disc-type spiral steam turbine comprises a circular shell, a circular upper rotary disc and a circular lower rotary disc, wherein the circular upper rotary disc and the circular lower rotary disc are coaxially arranged with the shell, the upper surface of the upper rotary disc is provided with a plane spiral convex edge A and a plane spiral convex edge B around the circle center, the plane spiral convex edge A and the plane spiral convex edge B are centrosymmetric, the plane spiral convex edge A and the plane spiral convex edge B are embedded into a gap between the plane spiral convex edge A and the plane spiral convex edge B, a gap is preset between the plane spiral convex edge A and the plane spiral convex edge B, the upper surface of the lower rotary disc is provided with a plane spiral convex edge a and a plane spiral convex edge B corresponding to the plane spiral convex edge A and the plane spiral convex edge B, the spiral direction of the plane spiral convex edge a is opposite to the spiral direction of the plane spiral convex edge A, and the spiral direction of the plane spiral convex edge B is opposite to the spiral direction of the plane spiral convex edge B, go up the lower surface of carousel with the last fixed surface of carousel is connected down, go up on the carousel be in the one end of keeping away from the carousel axle center in the gap between the protruding stupefied A of plane spiral and the protruding stupefied B of plane spiral is equipped with and runs through go up the venthole of carousel and lower carousel, it locates with the centre of a circle of carousel down all coaxial shaft holes to go up the carousel, go up carousel and lower carousel and locate in the casing, also be equipped with the shaft hole in the centre of a circle department of casing on the casing, the center pin passes through the shaft hole runs through the casing with go up carousel and lower carousel, correspond in the center pin go up the carousel and be equipped with air flue A and air flue B respectively with lower carousel, the one end of air flue A communicates with the initiating terminal in the gap between the protruding stupefied A of plane spiral and the protruding stupefied B of plane spiral, and the other end runs through lie in on the center pin lateral wall outside the casing, the one end of air flue B with the gap between the protruding stupefied a of plane spiral and the protruding stupefied B of plane spiral is stupefied a of plane spiral is stupefied B The other end of the central shaft extends out of the central shaft, and the central shaft is fixedly connected with the shell and the upper rotary table and the lower rotary table.

In the invention, the round upper rotary table is placed (or installed) on the upper surface of the round lower rotary table, the upper turntable and the lower turntable are coaxial, the upper surface of the upper turntable (namely the surface deviating from the lower turntable) is provided with a plane spiral convex arris A and a plane spiral convex arris B, the plane spiral convex arris A4 and the plane spiral convex arris B are set to be centrosymmetric at the center of the circle of the turntable, meanwhile, the mutual embedding of the plane spiral convex edge A and the plane spiral convex edge B into a gap between the plane spiral convex edge A and the plane spiral convex edge B is ensured, a gap is preset between the plane spiral convex edge A4 and the plane spiral convex edge B and is used for fluid to pass through when in use, the upper surface of lower carousel corresponds plane spiral protruding stupefied A and plane spiral protruding stupefied B and is equipped with plane spiral protruding stupefied a and plane spiral protruding stupefied B, wherein, corresponds the meaning of a word and is: the pattern formed by the plane spiral convex edge A and the plane spiral convex edge B displayed by the top view of the upper turntable and the pattern formed by the plane spiral convex edge a and the plane spiral convex edge B displayed by the top view of the lower turntable 3 are exactly symmetrical, so that the outer end of the gap in the upper turntable and the outer end of the gap in the lower turntable can be just projected in the horizontal plane to form a connection state; and the end of the gap between the upper turntable and the lower turntable is provided with an air outlet hole, after the central shaft is arranged in the center of the whole body formed by the upper turntable and the lower turntable through the shaft hole, because the central shaft is internally provided with an air passage A and an air passage B corresponding to the upper turntable and the lower turntable respectively, when the air-conditioning device is installed, one end of the air passage A is communicated with the starting end of the gap between the plane spiral convex edge A and the plane spiral convex edge B (namely, the end of the gap close to the circle center of the upper turntable), and one end of the air passage B is communicated with the starting end of the gap between the plane spiral convex edge a and the plane spiral convex edge B, when the air-conditioning device is arranged in this way, fluid is introduced from one end of the air passage A, which penetrates through the side wall of the central shaft and is positioned outside the shell, and air flow enters the upper turntable from one end of the gap in the upper turntable, which is close to the circle center of the upper turntable, the rotating directions of the plane spiral convex arris a and the plane spiral convex arris B in the lower rotary disc are opposite to the rotating directions of the plane spiral convex arris A and the plane spiral convex arris B in the upper rotary disc, so that the fluid passes through the gap in the lower rotary disc and the gap in the upper rotary disc in the same direction, and the fluid drives the upper rotary disc, the lower rotary disc and the shell to rotate again in the process of passing through the gap in the lower rotary disc.

Preferably, the side walls of the planar spiral convex edge a, the planar spiral convex edge B, the planar spiral convex edge a and the planar spiral convex edge B are provided with raised grains.

As a preferable mode, a plurality of air holes communicated with the air passage a are arranged at two ends of the air passage a on the circumferential surface of the central shaft, and the air passage a is communicated with the starting end of the gap between the plane spiral convex edge a and the plane spiral convex edge B through the air holes.

As a preferable mode, a plurality of air holes are arranged at the starting end of the gap between the plane spiral convex edge a and the plane spiral convex edge B on the circumferential surface of the central shaft, and the air passage B is communicated with the starting end of the gap between the plane spiral convex edge a and the plane spiral convex edge B through the air holes.

Preferably, projections of the edge of the planar spiral ridge a, the edge of the planar spiral ridge B, the edge of the planar spiral ridge a and the edge of the planar spiral ridge B on the upper surface of the upper turntable have raised grains.

As a preferable mode, an air seal bearing is arranged on the central shaft corresponding to the air passage a, an air passage C is radially arranged on the air seal bearing, one end of the air passage C close to the central shaft is communicated with the air passage a, and the other end of the air passage C extends out of the side wall of the air seal bearing.

Preferably, one end of the air duct B away from the lower rotary disc extends to the outside of the central shaft along the axis of the central shaft.

Preferably, a bearing is sleeved on the central shaft at a section facing the lower rotating disc.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention designs a disk type spiral steam turbine by adopting the air blast principle, namely the mode that the rotation direction is consistent with the gas flow direction, and the disk type spiral steam turbine has the characteristics of low rotating speed and high torque. The dependence degree on the design difficulty and the material process is small, the work-doing stages are dense, the volume diffusion ratio is small, the thermal conversion efficiency can be accurately controlled by adjusting the air inflow and the output torque, and the problems that the existing steam turbine technology is not beneficial to the miniaturization application of a steam turbine and the conversion efficiency of the existing steam turbine is reduced under the condition of large load are solved.

(2) The side walls of the plane spiral convex edge A, the plane spiral convex edge B, the plane spiral convex edge a and the plane spiral convex edge B are provided with the raised grains, so that after the design, high-temperature and high-pressure gas molecular groups are subjected to continuous decompression expansion in the flowing process to accelerate to form steam fluid lamination, the middle layer flows back in a lamination mode due to the fact that the pressure intensity in front of the operation of the gas is increased, the fluid below and the fluid in a diffusion area generate speed difference, turbulence is generated in the middle area, and finally a stage air resistance effect is generated under the relative flow speed difference of the working gas, so that the movement speed of the working gas and the movement speed of a turbine shell generate relative speed difference, and further a driving force consistent with the movement direction of the gas is obtained.

(3) The two ends of the air passage A are provided with a plurality of air holes communicated with the air passage A on the circumferential surface of the central shaft, and the air passage A is communicated with the starting end of a gap between the plane spiral convex edge A and the plane spiral convex edge B through the air holes so as to facilitate the fluid to pass through.

(4) Compared with the existing steam turbine system, the tail end steam utilization rate is high. Because the steam flow rate at the tail end of the existing steam turbine needs to provide shearing force for the blades at the tail end of the steam turbine, and further needs higher steam expansion rate and higher steam flow speed, the processed steam still has a large amount of waste heat entropy values, so that the tail end condensation process needs to provide higher vacuum degree. The disc type layout adopted by the invention promotes the linear velocity of the tail end steam to be reduced, and the steam flow velocity is not higher, so the entropy value of the waste heat carried by the processed gas is lower, the conversion efficiency of the hot steam and the mechanical energy is further increased, the workload of a tail end condenser is reduced, and the volume of a condensing system is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an upper turntable in the present invention;

FIG. 2 is a schematic structural view of a lower turntable according to the present invention;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a wave-shaped cross-section shell of an upper rotary disc or a lower rotary disc under the action of pressure potential energy of steam.

Wherein, 1, a shell; 2. an upper turntable; 3. a lower turntable; 4. a plane spiral convex edge A; 5. a plane spiral convex edge B; 6. a gap; 7. a plane spiral convex edge a; 8. a plane spiral convex edge b; 9. an air outlet; 10. a shaft hole; 11. an airway A; 12. an airway B; 13. wave lines; 14. air holes; 15. a gas seal bearing; 16. an airway C; 17. a central shaft; 18. and a bearing.

Detailed Description

As shown in fig. 1 to 4, a spiral steam turbine of a disc type includes a circular casing 1, a circular upper rotor disc 2 and a circular lower rotor disc 3 coaxially disposed with the casing 1, the upper surface of the upper rotor disc 2 is provided with a spiral flat ridge a4 and a spiral flat ridge B5 around the center of a circle, the spiral flat ridge a4 and the spiral flat ridge B5 are centrosymmetric, the spiral flat ridge a4 and the spiral flat ridge B5 are embedded into a gap therebetween, a gap 6 is preset between the spiral flat ridge a4 and the spiral flat ridge B5, the upper surface of the lower rotor disc 3 is provided with a spiral flat ridge a7 and a spiral ridge B8 corresponding to the spiral flat ridge a4 and the spiral flat ridge B5, the spiral direction of the spiral flat ridge a7 is opposite to the spiral direction of the spiral flat ridge a4, the spiral ridge B8 of the spiral flat ridge B8 is opposite to the spiral flat ridge B5, go up the lower surface of carousel 2 with the last fixed surface of carousel 3 connects down, go up on the carousel 2 the one end of keeping away from last carousel 2 axle center in the protruding stupefied A4 of plane spiral and the protruding stupefied B5 of plane spiral is equipped with and runs through go up carousel 2 and the venthole of carousel 3 down, go up carousel 2 and the equal coaxial shaft hole 10 that is equipped with in centre of a circle department of carousel 3 down, go up carousel 2 and carousel 3 down and locate in the casing 1, also be equipped with shaft hole 10 in the centre of a circle department of casing 1 on the casing 1, center pin 17 passes through shaft hole 10 runs through casing 1 with go up carousel 2 and carousel 3 down, correspond in the center pin 17 go up carousel 2 and carousel 3 down and be equipped with air flue A11 and air flue B12 respectively, the one end of air flue A11 communicates with the initiating terminal of the protruding stupefied A4 of plane spiral and the protruding stupefied B5 of plane spiral's gap 6, the other end of the air passage B12 penetrates through the side wall of the central shaft 17 which is positioned outside the shell 1, one end of the air passage B12 is communicated with the starting end of the gap 6 between the plane spiral convex edge a7 and the plane spiral convex edge B8, the other end of the air passage B12 extends out of the central shaft 17, and the central shaft 17 is fixedly connected with the shell 1 and the upper rotary table 2 and the lower rotary table 3.

In the invention, a round upper rotary disc 2 is placed (or mounted) on the upper surface of a round lower rotary disc 3, the upper rotary disc 2 and the lower rotary disc 3 are coaxial, a plane spiral convex edge A4 and a plane spiral convex edge B5 are arranged on the upper surface of the upper rotary disc 2 (namely, the surface of the upper rotary disc facing away from the lower rotary disc 3), the plane spiral convex edge A4 and the plane spiral convex edge B5 are arranged to be in central symmetry at the center of the upper rotary disc 2, a gap 6 is arranged between the plane spiral convex edge A4 and the plane spiral convex edge B5 and is ensured to be embedded into a gap between the plane spiral convex edge A4 and the plane spiral convex edge B5, the gap 6 is used for fluid to pass through in use, the upper surface of the lower rotary disc 3 is provided with a plane spiral convex edge a7 and a plane spiral convex edge B8 corresponding to the plane spiral convex edge A4 and the plane spiral convex edge B5, wherein, corresponding to a word means: the figure formed by the plane spiral convex edge A4 and the plane spiral convex edge B5 shown in the top view of the upper rotary table 2 is exactly symmetrical to the figure formed by the plane spiral convex edge a7 and the plane spiral convex edge B8 shown in the top view of the lower rotary table 3, so that the outer end of the gap 6 in the upper rotary table 2 and the outer end of the gap 6 in the lower rotary table can just form a connection state in the projection in the horizontal plane; moreover, after the central shaft 17 is arranged in the center of the whole body formed by the upper rotary disc 2 and the lower rotary disc 3 through the shaft hole 10, because the central shaft 17 is internally provided with the air passage A11 and the air passage B12 corresponding to the upper rotary disc 2 and the lower rotary disc 3 respectively, when the air-conditioning device is installed, one end of the air passage A11 is communicated with the starting end of the gap 6 between the plane spiral convex edge A4 and the plane spiral convex edge B5 (namely, the end of the gap 6 close to the center of the upper rotary disc 2), one end of the air passage B12 is communicated with the starting end of the gap 6 between the plane spiral convex edge a7 and the plane spiral convex edge B8), and after the air-conditioning device is arranged, when the air-conditioning device is used, fluid is introduced from one end of the air passage A11 penetrating through the side wall of the central shaft 17 which is positioned outside the shell 1, and air flow enters the upper rotary disc 2 from one end of the gap 6 in the upper rotary disc 2 close to the center of the upper rotary disc 2, therefore, the fluid shuttles through the gap 6 in the upper rotary disc 2 to drive the upper rotary disc 2 to rotate, then the airflow in the gap 6 in the upper rotary disc 2 flows through the air outlet hole 9 and enters the gap 6 in the lower rotary disc 3, because the rotating directions of the plane spiral convex edge a7 and the plane spiral convex edge B8 in the lower rotary disc 3 are opposite to the rotating directions of the plane spiral convex edge A4 and the plane spiral convex edge B5 in the upper rotary disc 2, the fluid passes through the gap 6 in the lower rotary disc 3 and the gap 6 in the upper rotary disc 2 in the same direction, and therefore, the fluid drives the upper rotary disc 2, the lower rotary disc 3 and the shell 1 to rotate once more in the process of passing through the gap 6 in the lower rotary disc 3. The steam working form adopted by the invention utilizes the motion characteristic of steam fluid, namely the air resistance effect generated in the flow direction of the gas by the diffusion-acceleration-aggregation-turbulence-friction process, so that each working process can generate the release of steam pressure and temperature and the conversion of mechanical energy. As shown in fig. 4, steam flows from a to b in the wavy shell of the upper turntable or the lower turntable under the action of pressure potential energy, high-temperature and high-pressure gas molecular groups are expanded in a continuous decompression manner in the flowing process to accelerate to form steam fluid lamination, the interlayer flows back in a lamination manner due to the increase of the pressure in front of the gas operation, so that the fluid below and the fluid in the diffusion area generate speed difference, further turbulence is generated in the intermediate area, and finally a stage air resistance effect is generated under the relative flow speed difference of the gas, so that the movement direction of the gas and the relative speed difference of the shell are promoted to obtain a driving force consistent with the movement direction of the gas. The vapor fluid produced during the period forms a relative speed difference with the shell, and the larger the speed difference is, the larger the driving force is produced.

The side walls of the plane spiral convex edge A4, the plane spiral convex edge B5, the plane spiral convex edge a7 and the plane spiral convex edge B8 are provided with the raised grains 13, so that after the design, high-temperature and high-pressure gas molecular groups are subjected to continuous decompression expansion in the flowing process to accelerate to form steam fluid lamination, the middle layer flows back in lamination due to the increase of the pressure in front of the operation of gas, the fluid below and the fluid in a diffusion area generate speed difference, turbulence is generated in the middle area, and finally a stage air resistance effect is generated under the relative flow speed difference of the gas, so that the moving direction of the gas and the relative speed difference of a turbine shell are promoted to obtain a driving force consistent with the moving direction of the gas.

The circumferential surface of the central shaft 17 is provided with a plurality of air holes 14 communicated with the air passage A11 at two ends of the air passage A11, and the air passage A11 is communicated with the starting end of the gap 6 between the plane spiral convex edge A4 and the plane spiral convex edge B5 through the air holes 14, so that the fluid can pass through the air holes conveniently.

The circumferential surface of the central shaft 17 is provided with a plurality of air holes 14 at the starting end of the gap 6 between the plane spiral convex edge a7 and the plane spiral convex edge B8, and the air passage B12 is communicated with the starting end of the gap 6 between the plane spiral convex edge a7 and the plane spiral convex edge B8 through the air holes 14.

The projections of the edge 4 of the plane spiral convex edge A, the edge of the plane spiral convex edge B5, the edge of the plane spiral convex edge a7 and the edge of the plane spiral convex edge B8 on the upper surface of the upper rotating disc 2 are provided with raised grains 13, so that after the design, the high-temperature and high-pressure gas molecular groups are continuously decompressed and expanded in the flowing process to form steam fluid lamination, the middle layer flows back in a lamination mode due to the fact that the pressure in front of gas operation is increased, the fluid below and the fluid in a diffusion area generate speed difference, turbulence is generated in the middle area, and finally stage air resistance effect is generated under the relative flow speed difference of the gas, the moving direction of the gas and the relative speed difference of a turbine shell are promoted, and further the driving force consistent with the moving direction of the gas is obtained.

The central shaft 17 is provided with an air seal bearing 15 corresponding to the air passage A11, the upper radial direction of the air seal bearing 15 is provided with an air passage C6, one end of the air passage C6 close to the central shaft 17 is communicated with the air passage A11, and the other end extends out of the side wall of the air seal bearing 15, so that the rotation of the central shaft 17 can be ensured, and the air tightness of the air passage A11 can also be ensured after the air seal bearing 15 is arranged.

The end of the air duct B2 far away from the lower rotary table 3 extends out of the central shaft 17 along the axis of the central shaft 17, so that the air duct B2 is convenient to assemble with other parts.

A bearing 18 is sleeved on the section of the central shaft 17 facing the lower rotary table 3.