Negative pressure gas recovery device

Abstract

The present invention relates to the field of negative pressure gas recovery devices. Disclosed is a negative pressure gas recovery device, which solves the problems of existing gas recovery devices involving complicated operation and an internal sealing ring being prone to leaking during a wear process and thus affecting the pressurization efficiency. The negative pressure gas recovery device comprises a hydraulic oil tank, a gas recovery mechanism, sealing mechanisms, a conveying-in pipe and a conveying-out pipe, wherein the gas recovery mechanism comprises pressurizing cylinders, sealing rings, first mounting disks and second mounting disks. In the present invention, the gas recovery mechanism drives the first mounting disks and the second mounting disks to slide back and forth in the pressurizing cylinders, such that a low-pressure oil-gas-water mixture in the conveying-in pipe is pressurized and conveyed into the conveying-out pipe for discharging; and when the first mounting disks and the second mounting disks slide back and forth, the sealing mechanisms push the sealing rings against the inner walls of the pressurizing cylinders, thereby improving the sealing performance, and the sealing rings are intermittently driven to rotate, thereby changing the positions where the sealing rings fit with the inner walls of the pressurizing cylinders, such that the wearing at the peripheries of the sealing rings is more uniform, thereby prolonging the service lives of the sealing rings.

Description

A negative pressure gas extraction device Technical Field

[0001] This invention relates to the field of negative pressure gas extraction device technology, specifically a negative pressure gas extraction device. Background Technology

[0002] As extraction continues, formation energy gradually decreases, reducing the well's own fluid-carrying capacity and leading to water flooding in some wells. The presence of accumulated fluid increases back pressure on the gas layer, limiting well production capacity and sometimes even completely shutting down the well. To extend the gas production cycle, methods such as foam drainage and reducing wellhead back pressure are commonly used to achieve drainage and gas production. In the later stages of extraction, many gas wells experience excessively low formation energy and insufficient output pressure, failing to meet the requirements of the pipeline network.

[0003] For wells that experience a significant pressure drop but can still produce gas, yet cannot independently deliver it into the pipeline network, the traditional solution is to install a large, fixed compressor to continuously compress natural gas 24 hours a day. This requires gas-liquid separation of the gas entering the compressor and timely treatment of the discharged liquid, resulting in high manual maintenance costs. Additionally, during pump operation, the sealing ring on the outer wall of the piston reciprocates against the inner wall of the pump, which can easily lead to wear of the sealing ring and affect the efficiency of fluid pressurization and delivery. Summary of the Invention

[0004] The purpose of this invention is to provide a negative pressure gas extraction device that facilitates improved gas extraction and transportation efficiency and extended equipment lifespan, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a negative pressure gas sampling device, comprising a hydraulic oil tank, a gas sampling mechanism, a sealing mechanism, an input pipe, and an output pipe. Multiple sets of oil pumps are connected to the hydraulic oil tank. The input pipe is used to input a low-pressure oil-gas-water mixture, and the output pipe is used to output a pressurized high-pressure oil-gas-water mixture. The gas sampling mechanism includes multiple pressurizing cylinders. A first mounting plate and a second mounting plate are slidably connected inside the pressurizing cylinder. A sealing ring is provided between the first mounting plate and the second mounting plate, slidingly fitting against the inner wall of the pressurizing cylinder. This sealing ring is used to drive the first mounting plate to... The second mounting plate slides back and forth within the pressurizing cylinder, thereby pressurizing the low-pressure oil-gas-water mixture in the input pipe and outputting it into the output pipe for discharge. The sealing mechanism is installed within the pressurizing cylinder and is used to push the sealing ring against the inner wall of the pressurizing cylinder when the first and second mounting plates slide back and forth, thereby improving the sealing performance. It also intermittently drives the sealing ring to rotate, changing the position of the sealing ring against the inner wall of the pressurizing cylinder, making the wear of the sealing ring more uniform around its perimeter, extending the service life of the sealing ring, and facilitating the improvement of gas extraction and transportation efficiency and equipment lifespan.

[0006] Preferably, the gas sampling mechanism further includes a pressure cylinder mounted on the ground via a bracket. Both ends of the pressure cylinder are fixedly connected to fixing plates, and both fixing plates are respectively fixedly connected to the pressure cylinder. The pressure cylinder has two sets of air inlet pipes connected to the input pipe and two sets of exhaust pipes connected to the output pipe. The two sets of air inlet pipes and exhaust pipes on the same pressure cylinder are located on both sides of the sealing ring. The pressure cylinder is equipped with a driving component for reciprocating sliding of the first mounting plate and the second mounting plate, facilitating the reciprocating sliding of the first mounting plate and the second mounting plate within the pressure cylinder, thereby pressurizing and outputting the low-pressure oil-gas-water mixture in the input pipe to the output pipe for discharge.

[0007] Preferably, the driving component includes a driving disc slidably connected to the inner wall of the pressure cylinder, a driving rod fixedly connected to the driving disc, the driving rod passing through the two fixed plates on both sides and slidably connected to the inner wall of the fixed plates, the two ends of the driving rod being fixedly connected to the first mounting discs on both sides respectively, and two sets of oil supply pipes connected to the pressure cylinder through electromagnetic reversing valves and connected to the oil pump and the hydraulic oil tank, which facilitates driving the first mounting disc and the second mounting disc to reciprocate.

[0008] Preferably, the sealing mechanism further includes a threaded rod rotatably connected to the second mounting plate, the threaded rod being threadedly connected to the first mounting plate, a first mounting ring rotatably connected to the side of the first mounting plate, and a second mounting ring rotatably connected to the side of the second mounting plate. The sealing ring is movably sleeved with the outer walls of the first and second mounting rings. The first and second mounting rings are provided with sealing elements for controlling the sealing state of the sealing ring, so that when the first and second mounting plates reciprocate, the sealing ring is pushed against the inner wall of the pressure cylinder to improve the sealing performance, and the sealing ring is intermittently rotated to change the position of the sealing ring against the inner wall of the pressure cylinder, so that the wear around the sealing ring is more uniform and the service life of the sealing ring is extended.

[0009] Preferably, the sealing element includes multiple sets of push blocks mounted on the second mounting ring. Both the first and second mounting rings have multiple sets of sliding grooves that can slide and connect with the outer wall of the push blocks. A first tension spring that is fixedly connected to the second mounting ring is fixedly connected to the push block. The push block can be inserted into the sliding groove on the first mounting ring. The first and second mounting plates are provided with control components for driving the push blocks to move and controlling the rotation of the sealing ring, so as to facilitate control of the sealing state of the sealing ring.

[0010] Preferably, the control component includes two sets of bellows respectively fixedly installed on the first mounting plate and the second mounting plate. A first drive plate is slidably connected in the horizontal direction to one end of the bellows on the first mounting plate, and a second drive plate is slidably connected in the horizontal direction to one end of the bellows on the second mounting plate. The bellows are used to store hydraulic oil. The first drive plate and the second drive plate are provided with rotating parts for driving the sealing ring to rotate, so as to drive the push block to move and control the rotation of the sealing ring.

[0011] Preferably, the rotating component includes two sets of first helical toothed rings fixedly connected to the first driving plate and the second driving plate respectively. A second helical toothed ring is fixedly connected to both the first mounting ring and the second mounting ring. The inclined surfaces of the first helical toothed rings on both sides can alternately slide and abut against the inclined surfaces of the second helical toothed rings on both sides. The second helical toothed ring is provided with a pushing element for pushing the pushing block against the inner wall of the sealing ring during rotation, so as to facilitate the rotation of the sealing ring.

[0012] Preferably, the pushing component includes multiple sets of first push rods installed in the first mounting ring. Both the first and second mounting plates have annular grooves. The first and second mounting plates also have first pipes for connecting the annular grooves to the bellows. The first, second, and second helical toothed rings have second pipes communicating with the annular grooves. The first push rods are slidably connected to the second pipes in the first mounting ring. A second push rod is slidably connected inside the second pipes on the second mounting ring, facilitating the pushing block to abut against the inner wall of the sealing ring during rotation.

[0013] Preferably, a fixing ring is fixedly connected inside the second pipe, and a second tension spring is fixedly connected to one end of the first push rod and the second push rod, which is fixedly connected to the fixing ring, so as to facilitate control of the reset state of the first push rod and the second push rod. A reset spring is fixedly connected to the first mounting plate and the second mounting plate, which is fixedly connected to the first mounting plate and the second mounting plate, so as to facilitate control of the first drive plate and the second drive plate on both sides to reset and slide out.

[0014] Preferably, both the intake pipe and the exhaust pipe are provided with a one-way valve for controlling the fluid to flow unidirectionally from the intake pipe into the pressurization cylinder and then unidirectionally out to the exhaust pipe after pressurization.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention provides a negative pressure gas sampling device that solves the problems of complex operation and easy leakage of internal sealing rings during wear in existing gas sampling devices, which affects pressurization efficiency. The gas sampling mechanism drives the first and second mounting plates to slide back and forth in the pressurization cylinder, thereby pressurizing the low-pressure oil-gas-water mixture in the input pipe and outputting it to the output pipe for discharge. When the first and second mounting plates slide back and forth, the sealing mechanism pushes the sealing ring against the inner wall of the pressurization cylinder, improving the sealing performance. It also intermittently drives the sealing ring to rotate, changing the position of the sealing ring against the inner wall of the pressurization cylinder, making the wear of the sealing ring more uniform and extending its service life. Gas-liquid separation is not required, effectively improving the gas sampling efficiency. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a top view of the overall structure of the present invention;

[0019] Figure 3 is a partial structural schematic diagram of the gas extraction mechanism of the present invention;

[0020] Figure 4 is a partial structural schematic diagram of the sealing mechanism of the present invention;

[0021] Figure 5 is a partial structural cross-sectional view of the sealing mechanism of the present invention;

[0022] Figure 6 is an enlarged view of region A in Figure 5;

[0023] Figure 7 is an enlarged view of region B in Figure 6;

[0024] Figure 8 is an exploded view of a partial structure of the sealing mechanism of the present invention;

[0025] Figure 9 is an enlarged view of region C in Figure 8.

[0026] In the diagram: 1. Hydraulic oil tank; 2. Input pipe; 3. Output pipe; 4. Oil pump; 5. Pressure cylinder; 6. First mounting plate; 7. Second mounting plate; 8. Sealing ring; 9. Pressure cylinder; 10. Fixing plate; 11. Air inlet pipe; 12. Exhaust pipe; 13. Drive plate; 15. Drive rod; 16. Oil supply pipe; 17. Threaded rod; 18. First mounting ring; 19. Second mounting ring; 20. Push block; 21. Sliding groove; 22. First tension spring; 23. Bellows; 24. First drive plate; 25. Second drive plate; 26. First helical toothed ring; 27. Second helical toothed ring; 28. First push rod; 29. ​​Annular groove; 30. First pipe; 31. Second pipe; 32. Second push rod; 33. Fixing ring; 34. Second tension spring; 35. Return spring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] Please refer to Figures 1-4. The figures illustrate a negative pressure gas sampling device, including a hydraulic oil tank 1, a gas sampling mechanism, a sealing mechanism, an input pipe 2, and an output pipe 3. Multiple sets of oil pumps 4 are connected to the hydraulic oil tank 1. The input pipe 2 is used to input a low-pressure oil-gas-water mixture, and the output pipe 3 is used to output a pressurized high-pressure oil-gas-water mixture. The gas sampling mechanism includes multiple sets of pressurizing cylinders 5. A first mounting plate 6 and a second mounting plate 7 are slidably connected inside each pressurizing cylinder 5. A sealing ring 8 is provided between the first mounting plate 6 and the second mounting plate 7, slidingly fitting against the inner wall of the pressurizing cylinder 5, for ventilation. The first mounting plate 6 and the second mounting plate 7 reciprocate within the pressurizing cylinder 5, thereby pressurizing the low-pressure oil-gas-water mixture in the input pipe 2 and discharging it into the output pipe 3. The sealing mechanism is installed within the pressurizing cylinder 5 and is used to push the sealing ring 8 against the inner wall of the pressurizing cylinder 5 when the first mounting plate 6 and the second mounting plate 7 reciprocate, thereby improving the sealing performance. It also intermittently drives the sealing ring 8 to rotate, changing the position of the sealing ring 8 against the inner wall of the pressurizing cylinder 5, making the wear of the sealing ring 8 more uniform and extending the service life of the sealing ring 8.

[0030] The gas extraction mechanism also includes a pressure cylinder 9 mounted on the ground via a bracket. Both ends of the pressure cylinder 9 are fixedly connected to a fixing plate 10. Both fixing plates 10 are fixedly connected to a pressure cylinder 5. The pressure cylinder 5 is connected to two sets of air inlet pipes 11 that are connected to the input pipe 2. The pressure cylinder 5 is also connected to two sets of exhaust pipes 12 that are connected to the output pipe 3. The two sets of air inlet pipes 11 and exhaust pipes 12 on the same pressure cylinder 5 are located on both sides of the sealing ring 8. The pressure cylinder 9 is equipped with a driving component for driving the first mounting plate 6 and the second mounting plate 7 to slide back and forth.

[0031] The driving component includes a driving disc 13 that is slidably connected to the inner wall of the pressure cylinder 9. A driving rod 15 is fixedly connected to the driving disc 13. The driving rod 15 passes through the two fixed plates 10 and is slidably connected to the inner wall of the fixed plates 10. The two ends of the driving rod 15 are fixedly connected to the two first mounting discs 6 on both sides. Two sets of oil supply pipes 16 are connected to the pressure cylinder 9 through electromagnetic reversing valves and connected to the oil pump 4 and the hydraulic oil tank 1. The air inlet pipe 11 and the exhaust pipe 12 are each provided with a one-way valve for controlling the fluid to be unidirectionally input into the pressure cylinder 5 from the air inlet pipe 11 and unidirectionally output to the exhaust pipe 12 after pressurization.

[0032] In this embodiment, hydraulic oil is pressurized and transported through the hydraulic oil tank 1 and the oil delivery pipe 16 by the oil pump 4. The connection between the two sets of oil delivery pipes 16 and the hydraulic oil tank 1 and the oil pump 4 is controlled by the solenoid reversing valve. When one oil delivery pipe 16 is connected to the oil pump 4, the other oil delivery pipe 16 is connected to the hydraulic oil tank 1. At this time, the oil pump 4 pressurizes the hydraulic oil and delivers it to the pressure cylinder 9 through the oil delivery pipe 16, pushing the drive disc 13 to slide to the other side, thereby squeezing the hydraulic oil on the other side into the hydraulic oil tank 1 for storage through the oil delivery pipe 16. When the drive disc 13 reaches one end of the pressure cylinder 9, the solenoid reversing valve switches the connection between the two sets of oil delivery pipes 16 and the oil pump 4 and the hydraulic oil tank 1, thereby driving the drive disc 13 to slide in the opposite direction. This process is repeated, and the drive disc 13 drives the drive rod 15 to slide back and forth, driving the first mounting disc 6 and the second mounting disc 7 at both ends to slide back and forth in the pressure cylinder 5.

[0033] When the first mounting plate 6 and the second mounting plate 7 move together with the sealing ring 8 to slide back and forth in the pressurizing cylinder 5, the fluid input from the input pipe 2 will be transported to the two pressurizing cylinders 5 through the air inlet pipe 11. In the pressurizing cylinder 5, the fluid on one side is pressurized and discharged into the exhaust pipe 12 through the one-way valve. At this time, the space on the other side of the first mounting plate 6 increases, generating negative pressure, which draws the fluid in the air inlet pipe 11 into the pressurizing cylinder 5 on that side through the one-way valve. After that, the first mounting plate 6 changes its moving direction, and the fluid on that side can be pressurized again and transported to the exhaust pipe 12 for output into the output pipe 3 through the one-way valve. The device has a stable and efficient structure, does not require gas-liquid separation and pressurization, and is more convenient to operate.

[0034] Example 2

[0035] Please refer to Figures 3-9. This embodiment further illustrates Embodiment 1. The sealing mechanism shown in the figures also includes a threaded rod 17 rotatably connected to the second mounting plate 7. The threaded rod 17 can be threadedly connected to the first mounting plate 6. A first mounting ring 18 is rotatably connected to the side of the first mounting plate 6, and a second mounting ring 19 is rotatably connected to the side of the second mounting plate 7. The sealing ring 8 can be movably sleeved with the outer walls of the first mounting ring 18 and the second mounting ring 19. The first mounting ring 18 and the second mounting ring 19 are provided with sealing elements for controlling the sealing state of the sealing ring 8.

[0036] The sealing element includes multiple sets of push blocks 20 mounted on the second mounting ring 19. Both the first mounting ring 18 and the second mounting ring 19 have multiple sets of sliding grooves 21 that can slide and connect with the outer wall of the push block 20. A first tension spring 22 that is fixedly connected to the second mounting ring 19 is fixedly connected to the push block 20. The push block 20 can be inserted into the sliding groove 21 on the first mounting ring 18. The first mounting plate 6 and the second mounting plate 7 are provided with control components for driving the push block 20 to move and controlling the sealing ring 8 to rotate.

[0037] The control unit includes two sets of bellows 23 respectively fixedly installed on the first mounting plate 6 and the second mounting plate 7. A first drive plate 24 is slidably connected to the first mounting plate 6 along the horizontal direction and fixedly connected to one end of the bellows 23 on the first mounting plate 6. A second drive plate 25 is slidably connected to the second mounting plate 7 along the horizontal direction and fixedly connected to one end of the bellows 23 on the second mounting plate 7. The bellows 23 is used to store hydraulic oil. The first drive plate 24 and the second drive plate 25 are provided with rotating parts for driving the sealing ring 8 to rotate.

[0038] The rotating component includes two sets of first helical toothed rings 26 that are fixedly connected to the first drive plate 24 and the second drive plate 25 respectively. The first mounting ring 18 and the second mounting ring 19 are each fixedly connected to a second helical toothed ring 27. The inclined surfaces of the first helical toothed rings 26 on both sides can alternately slide and abut against the inclined surfaces of the second helical toothed rings 27 on both sides. The second helical toothed ring 27 is provided with a pusher for pushing the pusher block 20 to abut against the inner wall of the sealing ring 8 during rotation.

[0039] The pushing component includes multiple sets of first push rods 28 installed in the first mounting ring 18. The first mounting plate 6 and the second mounting plate 7 are each provided with annular grooves 29. The first mounting plate 6 and the second mounting plate 7 are provided with first pipes 30 for connecting the annular grooves 29 and the bellows 23. The first mounting ring 18, the second mounting ring 19 and the second helical tooth ring 27 are provided with second pipes 31 that communicate with the annular grooves 29. The first push rods 28 are slidably connected to the second pipes 31 in the first mounting ring 18. The second push rods 32 are slidably connected in the second pipes 31 on the second mounting ring 19.

[0040] A fixing ring 33 is fixedly connected inside the second pipe 31. One end of the first push rod 28 and the second push rod 32 are respectively fixedly connected to a second tension spring 34 that is fixedly connected to the fixing ring 33. The first drive plate 24 and the second drive plate 25 are respectively fixedly connected to a return spring 35 that is fixedly connected to the first mounting plate 6 and the second mounting plate 7.

[0041] In this embodiment, during installation, the sealing ring 8 is first placed on the outside of the second mounting ring 19, and the second mounting plate 7 is aligned and brought close to the first mounting plate 6 so that the sealing ring 8 is attached to the outside of the first mounting ring 18. At the same time, the pushing block 20 is inserted into the sliding groove 21 on the first mounting ring 18. Then, the threaded rod 17 is rotated to fix the first mounting plate 6 and the second mounting plate 7, which also ensures the fixed position of the sealing ring 8. Similarly, during disassembly, the threaded rod 17 is unscrewed to remove the second mounting plate 7 and the sealing ring 8 for easy replacement.

[0042] During use, as the first mounting plate 6 and the second mounting plate 7 reciprocate within the pressure cylinder 5, the pressure on the second mounting plate 7 side is greater than that on the first mounting plate 6 side when sliding towards the second mounting plate 7 side. At this time, the fluid within the pressure cylinder 5 pushes the second drive plate 25, compressing the bellows 23 on that side. Simultaneously, the first helical toothed ring 26 on the second drive plate 25 is pushed towards the second helical toothed ring 27 on the second mounting ring 19, causing the second helical toothed ring 27 to be pushed by the inclined surface of the first helical toothed ring 26. This causes the second mounting ring 19 and the sealing ring 8 to rotate slightly, thereby changing the sliding position of the sealing ring 8 against the inner wall of the pressure cylinder 5. This prevents the sealing position on the sealing ring 8 from being continuously worn due to unevenness of the inner wall of the pressure cylinder 5 or the presence of particulate impurities at the bottom of the pressure cylinder 5, thus affecting the sealing performance of that position.

[0043] At this time, the second drive plate 25 on the other side is in the state of being pushed out by the reset spring 35. The first helical tooth ring 26 and the second helical tooth ring 27 on this side are not in contact. When the second mounting ring 19 drives the sealing ring 8 to rotate, the push block 20 will drive the first mounting ring 18 to rotate together. The first mounting ring 18 drives the second helical tooth ring 27 on this side to rotate, so that when the first helical tooth ring 26 on this side approaches the second helical tooth ring 27 again, it can push the second helical tooth ring 27 to rotate slightly through the inclined surface. This process is repeated, so that during the reciprocating movement of the sealing ring 8, the first mounting ring 18, the second mounting ring 19 and the sealing ring 8 are intermittently driven to rotate together.

[0044] It is worth noting that when the bellows 23 on one side is compressed, the hydraulic oil inside enters the annular groove 29 through the first pipe 30, and then flows into the second pipe 31 through the annular groove 29, thereby pushing the first push rod 28 or the second push rod 32 to lift it up. This ensures that no matter which side the sealing ring 8 slides to, the first push rod 28 or the second push rod 32 will lift the push frame, so that the sealing ring 8 is supported in all directions, improving the sealing strength with the inner wall of the pressure cylinder 5. At this time, the bellows 23 on the other side is in a suction state, and the second tension spring 34 pulls back, so that the first push rod 28 and the second push rod 32 alternately push the push block 20 to slide outward, improving the support force on the sealing ring 8. Through the design of the annular groove 29, the second pipe 31 can always maintain a communication state with the annular groove 29 as the second helical toothed ring 27 rotates.

[0045] This device requires no motors, chips, or other components for control and drive. It has a simple and stable structure and can automatically switch and engage during the reciprocating sliding of the sealing ring 8, ensuring a good sealing effect during use and effectively extending the service life of the equipment.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A negative pressure gas extraction device, characterized in that, include: The hydraulic oil tank (1), input pipe (2) and output pipe (3) are connected to multiple sets of oil pumps (4). The input pipe (2) is used to input low-pressure oil-gas-water mixture, and the output pipe (3) is used to output high-pressure oil-gas-water mixture after pressurization. Also includes: The gas extraction mechanism includes multiple sets of pressurizing cylinders (5). A first mounting plate (6) and a second mounting plate (7) are slidably connected inside the pressurizing cylinder (5). A sealing ring (8) is provided between the first mounting plate (6) and the second mounting plate (7) to slide against the inner wall of the pressurizing cylinder (5). The sealing ring is used to pressurize and output the low-pressure oil-gas-water mixture in the input pipe (2) to the output pipe (3) for discharge by driving the first mounting plate (6) and the second mounting plate (7) to slide back and forth inside the pressurizing cylinder (5). The sealing mechanism is installed inside the pressure cylinder (5) and is used to push the sealing ring (8) against the inner wall of the pressure cylinder (5) when the first mounting plate (6) and the second mounting plate (7) slide back and forth, thereby improving the sealing performance. It also intermittently drives the sealing ring (8) to rotate, changing the position of the sealing ring (8) against the inner wall of the pressure cylinder (5), so that the wear around the sealing ring (8) is more uniform and the service life of the sealing ring (8) is extended. The sealing mechanism further includes a threaded rod (17) rotatably connected to the second mounting plate (7), the threaded rod (17) being threadedly connected to the first mounting plate (6), a first mounting ring (18) being rotatably connected to the side of the first mounting plate (6), a second mounting ring (19) being rotatably connected to the side of the second mounting plate (7), the sealing ring (8) being movably sleeved with the outer walls of the first mounting ring (18) and the second mounting ring (19), and the first mounting ring (18) and the second mounting ring (19) being provided with sealing elements for controlling the sealing state of the sealing ring (8); The sealing element includes multiple sets of push blocks (20) mounted on the second mounting ring (19). Both the first mounting ring (18) and the second mounting ring (19) have multiple sets of sliding grooves (21) that can slide and connect with the outer wall of the push block (20). The push block (20) is fixedly connected to a first tension spring (22) that is fixedly connected to the second mounting ring (19). The push block (20) can be inserted into the sliding groove (21) on the first mounting ring (18). The first mounting plate (6) and the second mounting plate (7) are provided with control components for driving the push block (20) to move and controlling the sealing ring (8) to rotate. The control unit includes two sets of bellows (23) respectively fixedly installed on the first mounting plate (6) and the second mounting plate (7). The first mounting plate (6) is slidably connected in the horizontal direction to a first drive plate (24) fixedly connected to one end of the bellows (23) on the first mounting plate (6). The second mounting plate (7) is slidably connected in the horizontal direction to a second drive plate (25) fixedly connected to one end of the bellows (23) on the second mounting plate (7). The bellows (23) is used to store hydraulic oil. The first drive plate (24) and the second drive plate (25) are provided with rotating parts for driving the sealing ring (8) to rotate. The rotating component includes two sets of first helical toothed rings (26) fixedly connected to the first drive plate (24) and the second drive plate (25) respectively. The first mounting ring (18) and the second mounting ring (19) are each fixedly connected with a second helical toothed ring (27). The inclined surfaces of the first helical toothed rings (26) on both sides can alternately slide and abut against the inclined surfaces of the second helical toothed rings (27) on both sides. The second helical toothed ring (27) is provided with a pusher for pushing the pusher block (20) to abut against the inner wall of the sealing ring (8) during rotation.

2. The negative pressure gas extraction device according to claim 1, characterized in that: The gas extraction mechanism also includes a pressure cylinder (9) mounted on the ground via a bracket. Both ends of the pressure cylinder (9) are fixedly connected to a fixing plate (10). The fixing plates (10) on both sides are fixedly connected to the pressure cylinder (5). The pressure cylinder (5) is connected to two sets of air inlet pipes (11) that are connected to the input pipe (2). The pressure cylinder (5) is connected to two sets of exhaust pipes (12) that are connected to the output pipe (3). The two sets of air inlet pipes (11) and exhaust pipes (12) on the same pressure cylinder (5) are located on both sides of the sealing ring (8). The pressure cylinder (9) is provided with a driving component for driving the first mounting plate (6) and the second mounting plate (7) to slide back and forth.

3. The negative pressure gas extraction device according to claim 2, characterized in that: The driving component includes a driving disc (13) that is slidably connected to the inner wall of the pressure cylinder (9). A driving rod (15) is fixedly connected to the driving disc (13). The driving rod (15) passes through the two fixed plates (10) on both sides and is slidably connected to the inner wall of the fixed plate (10). The two ends of the driving rod (15) are fixedly connected to the first mounting discs (6) on both sides respectively. Two sets of oil supply pipes (16) are connected to the pressure cylinder (9) and connected to the oil pump (4) and the hydraulic oil tank (1) through electromagnetic reversing valves.

4. The negative pressure gas extraction device according to claim 1, characterized in that: The pusher includes multiple sets of first push rods (28) installed in the first mounting ring (18). The first mounting plate (6) and the second mounting plate (7) are respectively provided with annular grooves (29). The first mounting plate (6) and the second mounting plate (7) are provided with first pipes (30) for connecting the annular grooves (29) and the corrugated pipe (23). The first mounting ring (18), the second mounting ring (19) and the second helical tooth ring (27) are provided with second pipes (31) connected to the annular grooves (29). The first push rods (28) are slidably connected to the second pipes (31) in the first mounting ring (18). The second push rod (32) is slidably connected in the second pipes (31) on the second mounting ring (19).

5. A negative pressure gas extraction device according to claim 4, characterized in that: A fixing ring (33) is fixedly connected inside the second pipe (31). One end of the first push rod (28) and the second push rod (32) are respectively fixedly connected to a second tension spring (34) that is fixedly connected to the fixing ring (33). The first drive plate (24) and the second drive plate (25) are respectively fixedly connected to a return spring (35) that is fixedly connected to the first mounting plate (6) and the second mounting plate (7).

6. A negative pressure gas extraction device according to claim 2, characterized in that: Both the intake pipe (11) and the exhaust pipe (12) are equipped with one-way valves for controlling the fluid to flow unidirectionally from the intake pipe (11) into the pressurizing cylinder (5) and then unidirectionally output to the exhaust pipe (12) after pressurization.

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