阅读说明：本技术 一种嵌套式气液固旋流分离装置 (Nested gas-liquid-solid cyclone separation device ) 是由 邢雷 李枫 蒋明虎 赵立新 刘海龙 刘洋 于 2020-12-30 设计创作，主要内容包括：一种嵌套式气液固旋流分离装置。其特征在于：所述外套筒内含有气相分离模块、液相分离模块和固相分离模块,气液固三相混合液从外套筒进液口进入旋流分离装置后,通过气相分离模块嵌套的外螺旋流道与内螺旋流道使得气相被优先排出,同时分离出的液相依次通过螺旋流道内部、回流控制单元后重新回流到外套筒内,再经过液相分离模块旋流从而排出三相混合液中的密度较轻的溢流,环绕在外套筒内壁砂相最后经过固相分离模块使得砂相被分离,底流液通过内套管流出。本种旋流分离装置可对三相混合液的进行处理,实现气相、固相、溢流液、底流液的单相分离。(A nested gas-liquid-solid cyclone separation device. The method is characterized in that: the outer sleeve is internally provided with a gas phase separation module, a liquid phase separation module and a solid phase separation module, gas-liquid-solid three-phase mixed liquid enters the cyclone separation device from a liquid inlet of the outer sleeve, gas phases are preferentially discharged through an outer spiral flow channel and an inner spiral flow channel which are nested in the gas phase separation module, the separated liquid phases sequentially pass through the inside of the spiral flow channel and flow back to the outer sleeve again after the backflow control unit, overflow with light density in the three-phase mixed liquid is discharged through cyclone of the liquid phase separation module, sand phases surrounding the inner wall of the outer sleeve are finally separated through the solid phase separation module, and underflow liquid flows out through the inner sleeve. The cyclone separation device can treat three-phase mixed liquid and realize single-phase separation of gas phase, solid phase, overflow liquid and underflow liquid.)

1. A nested gas-liquid-solid cyclone separation device comprises an outer sleeve (1), and is characterized in that:

the device also comprises a gas phase separation module (2), a liquid phase separation module (3) and a solid phase separation module (4);

the outer sleeve (1) is cylindrical with two different end diameters and a variable diameter middle section, threads are formed on the inner walls of two end surfaces, the liquid inlet (22) and the sand discharge port (23) are distributed at two ends of the outer sleeve (1) and the directions of openings are opposite, and the direction of an overflow hole (24) at the middle end of the outer sleeve (1) is the same as that of the opening of the liquid inlet;

the gas phase separation module (2) comprises an external spiral flow passage (5), an internal spiral flow passage (6), a stepped sealing disc (7), an exhaust pipe (8), an outer end sealing disc (9), an internal spiral flow passage positioning unit (10) and a backflow control unit (11); the external spiral flow passage (5) is provided with an inner gas core hole (25), an inner ring cylinder (26), a liquid removal hole (27), a positioning hole (28), a reinjection hole (29), a flow stabilizing pipe (30) and a protective cover (31); a built-in spiral flow channel (6) is arranged in the inner ring cylinder (26), 3 rows of liquid removing holes are circumferentially distributed on the surface of the inner ring cylinder, 4 liquid removing holes are arranged in each row, the positioning holes (28) are matched with the holes of the dome positioning pin (12) to realize the positioning of the built-in spiral flow channel (6), and the reinjection hole (29) is in threaded connection with the shrinkage through column (14); the end face of the built-in spiral flow channel (6) is provided with a central hole in threaded connection with the positioning flow distribution cone (13), the circumference of the inner wall face of the central hole is provided with 3 through long holes, the stepped sealing disc (7) is in threaded connection with the external spiral flow channel (5), and the central round hole of the stepped sealing disc (7) is in threaded connection with the exhaust pipe (8); one end of the exhaust pipe (8) is in threaded connection with the stepped sealing disc (7), and the other end of the exhaust pipe is in threaded connection with the outer end sealing disc (9); the outer end sealing disc (9) is in threaded connection with the outer sleeve (1), and an axis exhaust pipe matching hole (32) is in threaded connection with the exhaust pipe (8); the built-in spiral flow channel positioning unit (10) comprises a dome positioning pin (12) and a positioning flow distribution cone (13), wherein the dome positioning pin (12) slides in a through long hole (33) of the built-in spiral flow channel (6); the positioning shunting cone (13) is in threaded connection with the built-in spiral flow channel (6); the backflow control unit (11) comprises a contraction through column (14), a flow blocking cover (15), an impact cone (16) and a fastening ring (17), one end of the contraction through column (14) is in threaded connection with an inner backflow hole (29) of the external spiral flow channel (5), and 4 fastening ring matching holes (34) are distributed on the circumference of the end face of the other end at equal intervals; the flow resisting cover (15) is provided with a main sliding rod (35) and auxiliary sliding rods (36), and the inner end faces of the 4 auxiliary sliding rods (36) are circumferentially distributed and matched with fastening ring matching holes (34) on the end faces of the contraction through columns (14); the central hole of the bottom end surface of the impact cone (16) is in threaded connection with a main sliding rod (35) in the flow resisting cover (15); the fastening ring (17) is a cylinder with a hole at one end, and the inner hole wall surface is provided with threads and is connected with an auxiliary sliding rod (36) of the flow resisting cover (15) through the threads;

the liquid phase separation module (3) comprises a gradual change spiral flow passage (18) and an overflow through pipe (19), the inclination angles of two sections of cones of the gradual change spiral flow passage (18) are different, an axis hole (37) is formed in the axis of the gradual change spiral flow passage (18), a vertical hole (38) is formed in the direction of the vertical axis, and the overflow through pipe (19) is connected into the vertical hole (38) of the gradual change spiral flow passage (18) in a threaded mode;

the solid-phase separation module (4) comprises an inner sleeve (20) and a thread bottom cone (21), the inner sleeve (20) is provided with a sand separation disc (39), a bottom flow pipe (40), a bottom cone matching hole (41) and a petal rotating handle (42), a through cavity is formed inside the inner sleeve, the opposite end face of the sand separation disc (39) is provided with the bottom cone matching hole (41) and a thread on the inner wall of the bottom cone matching hole, the outer surface of the inner sleeve (20) is provided with a end thread and is in threaded connection with the outer sleeve (1), the front end of the thread bottom cone (21) is conical, the middle end of the thread bottom cone (21) is cylindrical, the surface of the thread bottom cone is provided with a section of thread, the rear end of the thread bottom cone (21) is a concave;

the gas phase separation module (2) is in threaded connection with one end of the exhaust pipe (8), the other end of the exhaust pipe (8) is in threaded connection with the outer end sealing disc (9), and the outer end sealing disc (9) is in threaded connection with the outer sleeve (1); a vertical hole (38) in the gradual change spiral flow passage (18) is in threaded connection with the overflow through pipe (19), and the overflow through pipe (19) is in threaded connection with an overflow hole (24) on the outer sleeve (1); the inner sleeve (20) is in threaded connection with the outer sleeve (1), and the threaded bottom cone (21) is in threaded connection with the inner sleeve (20).

Technical Field

The invention relates to a gas-liquid-solid three-phase cyclone separation device applied to the fields of petrochemical industry and water treatment.

Background

Along with continuous exploitation of an oil field, the problem of sand and gas in produced liquid of the oil field is increasingly serious, the gas in the produced liquid can not only increase the cost of part of artificial lifting, but also can affect the environment if the accompanied gas cannot be well treated, more importantly, the efficiency of injection-production cyclone separation of a high-water-cut oil field from a well can be seriously affected, if the gas in mixed liquid can be collected and recycled, the low-efficiency cyclone separation can be avoided, and meanwhile, the waste of energy sources can be reduced; on the other hand contains sand problem also can not be in a small number, and a certain amount of sand can influence the efficiency of separation, and the phenomenon that the siltation was blockked up then can appear in a large amount of sand, consequently very necessary development gas-liquid-solid three-phase separator, and gas-liquid-solid three-phase separation swirler utilizes each interphase density difference to carry out cyclone separation usually, for example three-phase separation swirler, patent number: 2015108694142, the device designed by the invention patent can realize the separation of gas, liquid and solid phases, but still has more defects, firstly, the device realizes the solid phase separation, the spiral structure processing is complex and is not easy to realize, more importantly, the device can not realize the separation between underflow and overflow which are both liquid phases, thus needing to develop the multifunctional cyclone separation device which can realize the sand removal, the gas exhaust, the underflow separation and the overflow separation.

Disclosure of Invention

The invention provides a nested gas-liquid-solid cyclone separation device, wherein an exhaust mechanism of the device is composed of an internal nested spiral flow passage and an external nested spiral flow passage, so that overflow liquid is refluxed while accurate degassing is realized, the overflow liquid is discharged through a gradual change type spiral flow passage, and finally, the separation of a heavy sand phase is realized according to a density difference separation principle, and the nested gas-liquid-solid cyclone separation device has strong capacity of separating media of various phases.

The technical scheme of the invention is as follows: the nested gas-liquid-solid cyclone separator is provided with an outer sleeve, a gas phase separation module, a liquid phase separation module and a solid phase separation module.

The outer sleeve is cylindrical with two different outer diameters at two ends and a variable diameter at the middle section, threads are formed on the inner walls of two end surfaces, the liquid inlet and the sand discharge port are distributed at two ends of the outer sleeve, the directions of the through ports are opposite, and an overflow hole at the middle end of the outer sleeve is in the same direction as the through port of the liquid inlet;

the gas phase separation module comprises an external spiral flow channel, an internal spiral flow channel, a stepped sealing disc, an exhaust pipe, an outer end sealing disc, an internal spiral flow channel positioning unit and a backflow control unit; the main structure of the external spiral flow passage comprises an internal gas core hole, an internal ring cylinder, liquid removing holes, positioning holes, a reinjection hole, a flow stabilizing pipe and a protective cover, wherein the internal spiral flow passage is arranged in the internal ring cylinder, 3 rows of liquid removing holes are circumferentially distributed on the surface of the internal ring cylinder, each row is provided with 4 liquid removing holes, the positioning holes are matched with dome positioning pin holes to realize positioning of the internal spiral flow passage, and the reinjection hole is in threaded connection with a contraction through column; the end face of the built-in spiral runner is provided with a central hole which is in threaded connection with a positioning spreader cone, 3 through holes are circumferentially distributed on the inner wall surface of the central hole, the stepped sealing disc is in threaded connection with the external spiral runner, and a central circular hole of the stepped sealing disc is in threaded connection with the exhaust pipe; one end of the exhaust pipe is in threaded connection with the stepped sealing disc, and the other end of the exhaust pipe is in threaded connection with the outer end sealing disc; the outer end sealing disc is in threaded connection with the outer sleeve, a through hole is formed in the center of the outer end sealing disc and is in threaded connection with the exhaust pipe, the built-in spiral flow channel positioning unit comprises a dome positioning pin and a positioning flow-dividing cone, and the dome positioning pin slides in the built-in spiral flow through hole; the positioning spreader cone is in threaded connection with the built-in spiral runner; the backflow control unit comprises a contraction through column, a flow blocking cover, an impact cone and a fastening ring, wherein one end of the contraction through column is in threaded connection with a reinjection hole in the external spiral flow channel, and 4 through holes are distributed on the circumference of the end face of the other end of the contraction through column at equal intervals; the main structure of the flow resisting cover is provided with a main slide bar and auxiliary slide bars, wherein 4 auxiliary slide bars are circumferentially distributed on the inner end faces of the auxiliary slide bars and are matched with the matching holes of the fastening ring on the end face of the shrinkage through column; the central hole of the bottom end surface of the impact cone is in threaded connection with the main sliding rod in the flow resisting cover; the fastening ring is a cylinder with a hole at one end, and the inner hole wall surface is provided with threads and is connected with the auxiliary sliding rod of the flow resisting cover through the threads;

the liquid phase separation module comprises a gradual change spiral runner and an overflow through pipe, the inclination angles of two sections of cones of the gradual change spiral runner are different, an axial hole is formed in the axis of the gradual change spiral runner, a vertical hole is formed in the direction of the vertical axis, and the overflow through pipe is connected into the vertical hole of the gradual change spiral runner in a threaded mode;

the solid phase separation module comprises an inner sleeve and a thread bottom cone, the inner sleeve is mainly structurally provided with a sand separation disc, a bottom flow pipe and a petal rotating handle, a through cavity is arranged inside the inner sleeve, the opposite end face of the sand separation disc is provided with a bottom cone matching hole, threads are arranged on the inner wall of the sand separation disc, one end of the outer surface of the inner sleeve is provided with one end of threads and is in threaded connection with the outer sleeve, the front end of the thread bottom cone is a cone, the middle end of the thread bottom cone is cylindrical, the surface of the thread bottom cone is provided with one section of threads, the rear end of the;

the gas phase separation module is in threaded connection with one end of the exhaust pipe, the other end of the exhaust pipe is in threaded connection with the outer end sealing disc, and the outer end sealing disc is in threaded connection with the outer sleeve; the vertical hole in the gradual change spiral runner is in threaded connection with the overflow through pipe, and the overflow through pipe is in threaded connection with the overflow hole in the outer sleeve; the inner sleeve is in threaded connection with the outer sleeve, and the threaded bottom cone is in threaded connection with the inner sleeve.

The invention has the following beneficial effects: the device utilizes density difference among phases to carry out cyclone separation, can realize separation of gas phase, sand phase, overflow and underflow, gas-liquid-solid three-phase mixed liquid flows through an external spiral runner to generate strong cyclone so that light gas phase and partial overflow flow into a gas phase separation module, the gas phase separation module is mainly formed by nesting the internal spiral runner and the external spiral runner, a cam mechanism is adopted as an actuating mechanism of a positioning unit of the internal spiral runner, the gas phase is discharged through a secondary cyclone through an exhaust pipe, the rest overflow flows into an inner cavity of the external spiral runner from a liquid removal hole and then flows into an outer sleeve through a backflow control unit, the backflow control unit effectively controls liquid backflow according to the fluid pressure, a solid-liquid mixed phase after the gas phase is discharged generates strong cyclone through a liquid phase separation module so that the overflow is completely discharged through a gradual spiral runner, and the sand phase of a heavy phase surrounds the inner wall, the outer sleeve is in threaded connection with the inner sleeve, linear motion of the inner sleeve is achieved by rotating the inner sleeve, the size of a sand phase inlet passage (sand phase inlet) between the inner sleeve and the middle section of the outer sleeve is adjusted, so that sand phases flow into annular cavities of the inner sleeve and the outer sleeve and are discharged through a sand discharge port of the outer sleeve, and underflow liquid flows out of the underflow pipe after passing through a cavity inside the inner sleeve.

The following is a detailed description:

firstly, the nested gas-liquid-solid cyclone separator is attractive in appearance structure and innovative in function versatility, can separate each phase contained in a gas-liquid-solid three-phase mixed solution in an independent mode, and the whole separation process still maintains the efficient separation of overflow liquid and underflow liquid.

Secondly, the backflow control unit of the nested gas-liquid-solid cyclone separator is simple in structure, but can achieve powerful functions, liquid flowing out of the liquid removal hole can flow into the outer sleeve through the backflow control unit by ingeniously utilizing pressure difference among the liquid, and reverse inflow of the liquid in the outer sleeve is avoided.

And the device discharges gas by using secondary rotational flow generated by the internally and externally nested spiral flow channel for the first time, the liquid content in the discharged gas is minimum, the external spiral flow channel has a novel structure, and the flow stabilizing pipe and the protective cover play an important role in stabilizing the backflow control unit.

Then, the gradient spiral flow channel and the built-in spiral flow channel of the nested gas-liquid-solid cyclone separation device both adopt novel variable cone angle type flow channels, and the effective flow area of liquid at the end of the flow channel is far smaller than that of the initial end, so that the speed of the liquid flowing at the end in unit time is higher, and stronger swirling force can be generated, thereby being beneficial to the separation of all phases, and in addition, a cam mechanism is innovatively applied to realize the positioning of the built-in spiral flow channel.

Finally, the embedded gas-liquid-solid cyclone separator can adjust the desanding proportion according to actual requirements, and adjust the effective length of the inner sleeve in the outer sleeve by rotating the inner sleeve, so that the flow area of the annular inlet (namely a sand phase inlet) at the middle section of the sand separating disc and the outer sleeve is indirectly controlled, the length of the inner sleeve can be adjusted according to the actual desanding requirements, the desanding cannot be performed when the effective length of the inner sleeve in the outer sleeve is shortest, and the waste of underflow liquid under the condition of no sand is avoided; and the length of the thread bottom cone in the inner sleeve can be adjusted so as to adjust the effective length of the overflow core at the axis.

In conclusion, the nested gas-liquid-solid rotational flow separation device provided by the invention can realize the separation of gas-liquid-solid three-phase mixed liquid and can also simultaneously separate overflow and underflow, the built-in spiral flow channel is innovatively placed in the external spiral flow channel to form a nested combination, liquid contained in gas is fully separated and flows back, the amount of liquid attached in the discharged gas is greatly reduced, the back-flowing liquid flows into the outer sleeve through the back flow control unit and then passes through the gradual spiral flow channel, the gradual reduction of the effective overflow area of the gradual spiral flow channel can generate strong rotational flow and all overflow flows out of the overflow through pipe, the length of the inner sleeve in the outer sleeve can be dynamically adjusted according to the actual sand content, the overflow area of the sand phase inlet is indirectly changed, when the length of the inner sleeve in the outer sleeve is the smallest, the gas-liquid-solid rotational flow separator is high in actual applicability, the traditional gas-liquid-solid separation device can not realize the separation of overflow and underflow and has a fixed structure, but the invention can realize the complete separation of gas phase, sand phase, overflow and underflow and does not need to rotate an inner sleeve during desanding.

Description of the drawings:

FIG. 1 is an overall appearance view of a nested gas-liquid-solid cyclone separator.

FIG. 2 is an exploded view of a nested gas-liquid-solid cyclone separator.

FIG. 3 is a cross-sectional view of a nested gas-liquid-solid cyclone separator.

Figure 4 is a view of the outer sleeve.

FIG. 5 is an appearance diagram of the gas phase separation module assembly.

FIG. 6 is an exploded view of the gas phase separation module assembly.

FIG. 7 is a sectional view of the gas phase separation module assembly.

Fig. 8 is a sectional view of an external spiral flow passage.

Fig. 9 is a sectional view of the end face of the external spiral flow passage.

Fig. 10 is a structure view of a built-in spiral flow path.

Fig. 11 is a view of the positioning tap structure.

Fig. 12 is a schematic view of the positioning completion of the positioning unit of the built-in spiral flow channel.

Fig. 13 is a schematic view of the positioning cancellation of the positioning unit of the built-in spiral flow channel.

FIG. 14 is a view showing a structure of a stepped closing disk.

Fig. 15 is a structure view of an exhaust pipe.

FIG. 16 is a view showing the construction of the outer end closing disk.

Fig. 17 is an overall assembly view of the backflow control unit.

Fig. 18 is an exploded view of the backflow control unit.

Fig. 19 is an overall sectional view of the backflow control unit.

FIG. 20 is a view showing a structure of a contracted column.

Fig. 21 is a view showing a structure of a choke cover.

FIG. 22 is a sectional view of the interior of the impact cone.

Fig. 23 is a view showing a structure of a gradient spiral flow path.

Fig. 24 is a cross-sectional view of a tapered spiral flow channel.

Fig. 25 is a structure view of the overflow pipe.

Fig. 26 is a view showing the structure of the inner tube.

FIG. 27 is a view showing the structure of a bottom cone.

FIG. 28 is a schematic diagram of solid phase separation module separation with a small amount of sand phase.

FIG. 29 is a schematic diagram of solid phase separation module separation when a large amount of sand phase is contained.

FIG. 30 is a schematic diagram of solid phase separation module separation in the absence of a sand phase.

In the figure, 1-an outer sleeve, 2-a gas phase separation module, 3-a liquid phase separation module, 4-a solid phase separation module, 5-an external spiral flow channel, 6-an internal spiral flow channel, 7-a stepped sealing disc, 8-an exhaust pipe, 9-an external end sealing disc, 10-an internal spiral flow channel positioning unit, 11-a backflow control unit, 12-a dome positioning pin, 13-a positioning splitter cone, 14-a shrinkage through column, 15-a flow blocking cover, 16-an impact cone, 17-a fastening ring, 18-a gradual change spiral flow channel, 19-an overflow through pipe, 20-an inner sleeve, 21-a threaded bottom cone, 22-a liquid inlet, 23-a sand outlet, 24-an overflow hole, 25-an internal gas core hole, 26-an inner ring cylinder, 27-a liquid removal hole and 28-a positioning hole, 29-refill hole, 30-flow stabilizer, 31-protective cover, 32 exhaust pipe matching hole, 33-through long hole, 34-fastening ring matching hole, 35-main slide bar, 36-auxiliary slide bar, 37-axial hole, 38-vertical hole, 39-sand separation disc, 40-underflow pipe, 41-bottom cone matching hole, 42-petal rotating handle and 43-concave ball.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings in which:

the nested gas-liquid-solid cyclone separator has the overall appearance as shown in figure 1, gas-liquid-solid three-phase mixed liquid enters the outer sleeve 1 from the liquid inlet 22 for separation, gas phase is discharged through the gas exhaust pipe 8, sand phase is discharged through the sand discharge port 23, overflow liquid is discharged through the overflow through pipe 19, and underflow liquid is discharged through the underflow pipe 40. An explosion diagram of the nested gas-liquid-solid cyclone separator is shown in fig. 2 and mainly comprises an outer sleeve 1, a gas-phase separation module 2, an exhaust pipe 8, an outer end sealing disc 9, a gradual spiral flow passage 18, an overflow through pipe 19, an inner sleeve 20 and a threaded bottom cone 21. Fig. 3 is a cross-sectional view of the nested gas-liquid-solid cyclone separator, and after entering from the liquid inlet 22, the gas-liquid-solid three-phase mixed liquid sequentially passes through the gas phase separation module 2, so that the gas is discharged from the gas discharge pipe 8, the overflow is discharged through the overflow pipe 19 through the liquid phase separation module 3, and the solid phase is discharged from the sand discharge port 23 through the solid phase separation module 4. Fig. 4 is a structure diagram of the outer sleeve 1, one side end surface of the liquid inlet 22 is in threaded connection with the outer end sealing disc 9, and an end overflow hole 24 in the outer sleeve 1 is matched with the overflow through pipe 19 to position the liquid phase separation module 3.

Fig. 5 is an external view of the assembly of the vapor separation module 2. An exploded view of an assembly body of the gas phase separation module 2 is shown in fig. 6 and mainly comprises an external spiral flow channel 5, an internal spiral flow channel 6, a stepped sealing disc 7, an exhaust pipe 8, a backflow control unit 11, a dome positioning pin 12 and a positioning spreader 13. The cross-sectional view of the assembly body of the gas phase separation module 2 is shown in fig. 7, a backflow control unit 11 is connected to an external spiral flow channel 5 in a threaded manner, the internal spiral flow channel 6 is assembled inside the external spiral flow channel 5, a positioning flow-dividing cone 13 controls the positioning of the internal spiral flow channel 6, a stepped sealing disc 7 is connected with the external spiral flow channel 5 in a threaded manner to enable the internal sealing of the external spiral flow channel 5, and an exhaust pipe 8 is connected with the stepped sealing disc 7 in a threaded manner to enable a gas phase to be exhausted through the. Fig. 8 is a cross-sectional view of the external spiral flow channel 5, the light-phase gas and part of overflow enters the internal cylinder 26 of the external spiral flow channel 5 through the internal gas core hole, the internal spiral flow channel 6 is assembled in the internal cylinder 26 to enable the gas-liquid mixed phase to secondarily swirl, so that the liquid content of the separated gas phase is greatly reduced and is discharged through the exhaust pipe 8, the rest of the liquid phase is swirled to the inner wall of the internal cylinder 26 and flows into the backflow control unit 11 through the liquid-removing hole 27 to flow back into the outer sleeve 1, the flow-stabilizing pipe 30 can stabilize the flow field pressure near the backflow control unit 11 and reduce the liquid backflow resistance, the protective cover 31 can reduce the convection pressure of the swirling pressure generated inside the outer sleeve 1 on the backflow control unit 11, the front impact force on the backflow control unit 11 is reduced, and the dome positioning pin 12 is matched with the positioning hole. Fig. 9 is a cross-sectional view of the end face of the external spiral flow channel 5, and the number of the refill holes 29 and the flow stabilizing tubes 30 is 4, and the refill holes and the flow stabilizing tubes are circumferentially distributed on the same end face of the external spiral flow channel. The structure of the built-in spiral flow channel 6 is shown in fig. 10, a central hole is arranged on the end surface and is in threaded connection with the positioning spreader 13, and 3 through long holes 33 are distributed on the circumference of the inner wall surface of the round hole and are used as positioning slideways of the dome positioning pins 12. Fig. 11 is a view showing a positioning structure of a tap 13, the end of which is screwed to the built-in spiral flow passage 6, the cam structure at the bottom end is used for controlling the positioning of the built-in spiral flow passage 6, and the groove at the top end is used as a rotary driving force application point. The initial installation schematic diagram and the positioning schematic diagram of the internal spiral flow channel positioning unit are shown in fig. 12 and 13, the dome positioning pin 12 is located in the through long hole 33 in the internal spiral flow channel 6, so that the dome positioning pin 12 can achieve reciprocating extension, after the relative concave part of the cam at the bottom end of the positioning spreader 13 is aligned with the dome of the dome positioning pin 12 in the same horizontal line, the positioning spreader 13 is rotated clockwise for half a circle to enable the convex end of the cam to be in contact with the dome of the dome positioning pin 12, and in the process, the dome positioning pin 12 is lifted along with the situation to be matched into the positioning hole 28 of the external spiral flow channel 5, so. Fig. 14 is a structural diagram of the stepped sealing disk 7, the stepped sealing disk 7 is in threaded connection with the external spiral flow passage 5 to realize the sealing of the external spiral flow passage 5, and a central circular hole of the stepped sealing disk 7 is in threaded connection with the exhaust pipe 8. Fig. 15 is a view showing the structure of the exhaust pipe 8, which is screwed with the stepped closing disk 7 next to the end screw end and is screwed with the outer end closing disk 9 at the other end. Fig. 16 is a structural view of the outer end sealing disk 9, the outer end sealing disk 9 is screwed with the outer sleeve 1 to seal the outer sleeve 1, and the axial exhaust pipe fitting hole 32 is screwed with the exhaust pipe 8 to fix the gas phase separation module 2 and the outer sleeve 1 together.

Fig. 17 is an assembled view of the backflow control unit 11 as a whole, and the backflow control unit 11 is screwed into the backflow hole 29 of the external spiral flow passage 5. Fig. 18 is an exploded view of the backflow control unit 11, which mainly comprises a contraction through column 14, a choke cover 15, a shock cone 16 and a fastening ring 17. Fig. 19 is an overall sectional view of the reflux control unit 11, the refluxed liquid phase passes through the constricted column 14, then the flow resisting cover 15 is impacted under the action of liquid pressure to enable the auxiliary slide rod 36 to slide in the fastening ring matching hole 34, so that the gap between the flow resisting cover 15 and the contraction through column 14 is enlarged to further discharge liquid phase needing backflow, the fastening ring 17 is used for preventing the auxiliary slide rod 36 from being separated from the fastening ring matching hole 34 in the sliding process, if the external flow field pressure of the backflow control unit 11 is larger than the internal pressure, the external liquid phase flows into the flow resisting cover 15 through the gap between the flow resisting cover 15 and the contraction through column 14, then the liquid phase applies pressure to the bottom end face of the impact cone 16, and at the moment, the impact cone 16 drives the main slide rod 35 to reversely slide, the gap between the flow resisting cover 15 and the contraction through column 14 is reduced, external liquid is effectively isolated from entering the reflux control unit 11, and the normal gap between the flow resisting cover 15 and the contraction through column 14 is restored until the liquid phase reflux pressure is greater than the external liquid phase pressure. Fig. 20 is a structural view of the contraction column 14, in which the contraction column 14 is screwed to the refill hole 29 to fix the backflow control unit 11 to the external spiral flow path 5. Fig. 21 is a structure diagram of the choke cover 15, wherein 4 auxiliary sliding rods 36 are circumferentially distributed on the inner end surface and are matched with fastening ring matching holes 34 on the end surface of the contraction through column 14, and a main sliding rod 35 is connected with an impact cone 16 through threads. Fig. 22 is a cross-sectional view of the inside of the impact cone 16, in which the bottom end surface of the impact cone 16 facing one end of the spoiler 15 can dynamically adjust the gap between the spoiler 15 and the retractable through post 14 according to the actual internal and external pressures of the backflow control unit 11, and the inside of the impact cone 16 is a hollow cavity so that the dead weight does not affect the sliding adjustment process of the impact cone 16.

The structure of the gradual spiral flow passage 18 is shown in fig. 23, and the gradual spiral conical passage can make the mixed liquid generate larger centrifugal force. Fig. 24 is a sectional view of the gradual change spiral flow passage 18, the overflow pipe 19 is in threaded connection with the vertical hole 38 of the gradual change spiral flow passage 18, and overflow liquid is discharged through the axial hole 37 and the vertical hole 38 in sequence. Fig. 25 is a structural view of the overflow pipe 19, which is screwed with the vertical hole 38 in the gradual change spiral flow passage 18, and the other end is screwed with the overflow hole 24 of the outer sleeve 1 to position the liquid phase separation module 3. Fig. 26 is a structural diagram of the inner sleeve 20, the sand separating disc 39 plays a role in separating sand phases and liquid phases with different densities in the mixed liquid, underflow liquid of a relatively light phase enters the inner cavity of the inner sleeve 20 and then is discharged through the underflow pipe 40, the inner sleeve 20 is in threaded connection with the outer sleeve 1, linear motion of the inner sleeve 20 is realized by rotating the petal rotating handle 42, so that the size of a passage (sand phase inlet) between the sand separating disc 39 and the outer sleeve 1 is changed, accurate regulation and control of treatment of different sand contents are realized, and a bottom cone matching hole is in threaded connection with the thread bottom cone 21. Fig. 27 is a structure diagram of the bottom tap 21, the bottom tap 21 is connected to the inner sleeve 20 in a threaded manner, and the effective length of the bottom tap 21 in the inner sleeve 20 is regulated by rotating the concave ball 43, so that the separation efficiency is improved. The schematic diagram of the separation of the solid-phase separation module 4 when a small amount of sand phase is contained is shown in fig. 28, heavy sand phase is attached to the inner wall of the outer sleeve 1 under the action of the centrifugal force, then enters the annular cavity between the outer sleeve 1 and the inner sleeve 20 and is discharged through the sand discharge port 23, relatively light underflow liquid is screwed into the inner sleeve 20 and is discharged through the underflow pipe 40, the inner sleeve 20 and the bottom cone 21 of the thread can be independently and freely adjusted, the sand separation disc 39 of the inner sleeve 20 is ensured to be positioned at the middle section reducing section of the outer sleeve 1, the sand removal function can be realized, the effective length of the inner sleeve 20 in the outer sleeve 1 can be changed by rotating the petal rotating handle 42, and the effective length of the bottom cone 21 in. Fig. 29 is a schematic view showing the separation of the solid phase separation module 4 when a large amount of sand phase is contained, and the effective length of the rotating inner sleeve 20 in the outer sleeve 1 is the largest, compared with the case that the gap (sand phase inlet) between the sand-separating disc 39 in the inner sleeve 20 and the outer sleeve 1 is obviously enlarged, so that more sand phase is separated. Fig. 30 is a schematic diagram of the separation of the solid-phase separation module 4 when no sand phase exists, when the effective length of the rotary inner sleeve 20 in the outer sleeve 1 is minimum, the sand-separating disc 39 is screwed into the cylindrical part at the bottom end of the outer sleeve 1, the diameter of the outer end of the sand-separating disc is the same as that of the bottom end of the outer sleeve 1, at this time, the sand phase inlet is closed, and all the underflow liquid is discharged from the underflow pipe 40 through the inner cavity of the inner sleeve 20.

The nested gas-liquid-solid multiphase integrated cyclone separation device can perform gas-liquid-solid three-phase separation under the condition of a complex flow field and still realize effective separation between underflow liquid and overflow liquid, compared with a conventional degassing device, an internal and external nested tapered section flow passage is innovatively adopted to greatly reduce the internal liquid content of the discharged gas phase, a cam mechanism is used as a regulating mechanism of a built-in spiral flow passage positioning unit, the operation is simple, the positioning is accurate, a backflow control unit can effectively control liquid backflow according to the internal and external hydraulic pressures, a solid phase separation module can also dynamically regulate according to the actual sand content to reduce the separated solid phase liquid content to the minimum, the solid phase separation module can be closed under the condition of no sand phase to ensure that the whole device only performs gas-liquid interphase separation, the actual separation efficiency is greatly improved, and the ineffective discharge of the underflow liquid is avoided, the multifunctional desk has powerful functions, can realize multiple purposes and has strong practical application value.