Negative pressure gas extraction device

Abstract

The present invention discloses a negative pressure gas extraction device, which relates to the field of negative pressure gas extraction devices and solves the problem that the existing gas extraction devices are complicated to operate and the internal sealing ring is prone to leakage during the wear process, thereby affecting the pressurization efficiency. The present invention comprises a hydraulic oil tank, a gas extraction mechanism, a sealing mechanism, an input pipe and an output pipe. The gas extraction mechanism comprises a pressurizing cylinder, a sealing ring, a first mounting plate and a second mounting plate. The present invention drives the first mounting plate and the second mounting plate to slide back and forth in the pressurizing cylinder through the gas extraction mechanism, so that the low-pressure oil, gas and water mixture in the input pipe is pressurized and output to the output pipe for discharge. When the first mounting plate and the second mounting plate slide back and forth through the sealing mechanism, the sealing ring is pushed toward the inner wall of the pressurizing cylinder to improve the sealing performance, and the sealing ring is intermittently driven to rotate to change the position where the sealing ring fits the inner wall of the pressurizing cylinder, so that the wear around the sealing ring is more uniform, thereby extending the service life of the sealing ring.

Description

Technical Field

[0001] The invention relates to the technical field of negative pressure gas collection devices, in particular to a negative pressure gas collection device. Background Art

[0002] As the exploitation time goes on, the formation energy gradually decreases, and the gas well's own liquid carrying capacity decreases, resulting in water flooding in some gas wells. The presence of accumulated liquid will increase the back pressure on the gas layer and limit the production capacity of the well, and sometimes even completely crush the well and shut it down. In order to extend the gas production cycle of the gas well, methods such as foam drainage and reducing wellhead back pressure are currently used to achieve the effect of drainage and gas production. In the later stages of exploitation of many gas wells, the formation energy is too low and the output pressure is insufficient, so that it cannot meet the requirements of the input pipeline network.

[0003] For wells where the pressure has dropped significantly and production is still possible but the gas cannot be transported into the pipeline network independently, the traditional solution is to add a fixed large compressor to compress the natural gas 24 hours a day. The gas entering the compressor needs to be separated into gas and liquid, and the discharged liquid must be handled in time. The manual maintenance cost is high. At the same time, when the pump body is working, the sealing ring on the outer wall of the piston and the inner wall of the pump body reciprocate, which can easily cause wear of the sealing ring and affect the pressurized delivery efficiency of the fluid. Summary of the invention

[0004] The purpose of the present invention is to provide a negative pressure gas collection device that is convenient for improving gas collection and transportation efficiency and equipment service life, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a negative pressure gas extraction device, comprising a hydraulic oil tank, a gas extraction mechanism, a sealing mechanism, an input pipe and an output pipe, wherein the hydraulic oil tank is connected to multiple groups of oil pumps, 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 extraction mechanism comprises multiple groups of pressurized cylinders, a first mounting plate and a second mounting plate are slidably connected in the pressurized cylinder, a sealing ring which is slidably fitted with the inner wall of the pressurized cylinder is provided between the first mounting plate and the second mounting plate, and is used to drive the first mounting plate and the second mounting plate to slide with each other to form a sealing ring. The second mounting disk slides back and forth in the pressurizing cylinder, thereby pressurizing the low-pressure oil-gas-water mixture in the input pipe and outputting it to the output pipe for discharge. The sealing mechanism is installed in the pressurizing cylinder, and is used to push the sealing ring toward the inner wall of the pressurizing cylinder when the first mounting disk and the second mounting disk slide back and forth, so as to improve the sealing performance, and intermittently drive the sealing ring to rotate, so as to change the position where the sealing ring fits with the inner wall of the pressurizing cylinder, so as to make the wear of the sealing ring around it more uniform, thereby extending the service life of the sealing ring, and facilitating the improvement of gas production and transportation efficiency and equipment service life.

[0006] Preferably, the gas extraction mechanism also includes a pressure cylinder installed on the ground by a bracket, both ends of the pressure cylinder are fixedly connected with fixing plates, the fixing plates on both sides are respectively fixedly connected to the pressure cylinder, the pressure cylinder is connected with two groups of air intake pipes connected with the input pipe, the pressure cylinder is connected with two groups of exhaust pipes connected with the output pipe, the two groups of air intake pipes and exhaust pipes on the same pressure cylinder are respectively located on both sides of the sealing ring, and a driving member for driving the first mounting disk and the second mounting disk to slide back and forth is provided in the pressure cylinder, so that the low-pressure oil-gas-water mixture in the input pipe is pressurized and output to the output pipe for discharge by driving the first mounting disk and the second mounting disk to slide back and forth in the pressure cylinder.

[0007] Preferably, the driving member includes a driving disk slidably connected to the inner wall of the pressure cylinder, a driving rod is fixedly connected to the driving disk, the driving rod passes through the fixed plates on both sides and is slidably connected to the inner walls of the fixed plates, both ends of the driving rod are respectively fixedly connected to the first mounting disks on both sides, and the pressure cylinder is connected to two groups of oil pipes connected to the oil pump and the hydraulic oil tank through an electromagnetic reversing valve, so as to facilitate driving the first mounting disk and the second mounting disk to slide back and forth.

[0008] Preferably, the sealing mechanism also includes a threaded rod rotatably connected to the second mounting disk, the threaded rod can be threadedly connected to the first mounting disk, the side of the first mounting disk is rotatably connected to a first mounting ring, the side of the second mounting disk is rotatably connected to a second mounting ring, the sealing ring can be movably sleeved with the outer walls of the first mounting ring and the second mounting ring, the first mounting ring and the second mounting ring are provided with sealing members for controlling the sealing state of the sealing ring, so that when the first mounting disk and the second mounting disk slide back and forth, the sealing ring is pushed toward the inner wall of the pressurizing cylinder to improve the sealing performance, and the sealing ring is intermittently driven to rotate, thereby changing the position of the sealing ring in contact with the inner wall of the pressurizing cylinder, so that the wear on all sides of the sealing ring is more uniform, thereby extending the service life of the sealing ring.

[0009] Preferably, the sealing member comprises a plurality of pushing blocks mounted on the second mounting ring, the first mounting ring and the second mounting ring are provided with a plurality of sliding grooves that can be slidably connected to the outer wall of the pushing block, the pushing block is fixedly connected to a first tension spring that is fixedly connected to the second mounting ring, the pushing block can be plugged into the sliding groove on the first mounting ring, and the first mounting plate and the second mounting plate are provided with a control member for driving the pushing block to move and controlling the sealing ring to rotate, thereby facilitating controlling the sealing state of the sealing ring.

[0010] Preferably, the control component includes two groups of bellows fixedly mounted on the first mounting plate and the second mounting plate, respectively; a first driving plate fixedly connected to one end of the bellows on the first mounting plate is slidably connected on the first mounting plate in a horizontal direction; a second driving plate fixedly connected to one end of the bellows on the second mounting plate is slidably connected on the second mounting plate in a horizontal direction; the bellows are used to store hydraulic oil; a rotating component for driving the sealing ring to rotate is provided on the first driving plate and the second driving plate, thereby driving the push block to move and controlling the sealing ring to rotate.

[0011] Preferably, the rotating member includes two groups of first beveled gear rings fixedly connected to the first drive plate and the second drive plate respectively, and the first mounting ring and the second mounting ring are respectively fixedly connected with second beveled gear rings, and the inclined surfaces of the first beveled gear rings on both sides can alternately slide and contact with the inclined surfaces of the second beveled gear rings on both sides, and the second beveled gear ring is provided with a pushing member for pushing the pushing block to contact the inner wall of the sealing ring during rotation, so as to drive the sealing ring to rotate.

[0012] Preferably, the pushing member includes multiple groups of first push rods installed in the first mounting ring, the first mounting plate and the second mounting plate are respectively provided with annular grooves, the first mounting plate and the second mounting plate are provided with first pipes for connecting the annular grooves with the bellows, the first mounting ring, the second mounting ring and the second bevel gear ring are provided with second pipes connected to the annular grooves, the first push rod is slidably connected to the second pipe in the first mounting ring, and the second push rod is slidably connected to the second pipe on the second mounting ring, so as to push the pushing block to contact the inner wall of the sealing ring during rotation.

[0013] Preferably, a fixing ring is fixedly connected inside the second pipe, and one end of the first push rod and the second push rod are respectively fixedly connected with a second tension spring fixedly connected to the fixing ring, so as to facilitate controlling the reset state of the first push rod and the second push rod, and the first driving plate and the second driving plate are respectively fixedly connected with a reset spring fixedly connected to the first mounting disk and the second mounting disk, so as to facilitate controlling the first driving plate and the second driving plate on both sides to reset and slide out.

[0014] Preferably, the intake pipe and the exhaust pipe are each provided with a one-way valve for controlling the one-way input of the fluid from the intake pipe into the pressurizing cylinder and the one-way output of the fluid to the exhaust pipe after pressurization.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The negative pressure gas extraction device provided by the present invention solves the problems that the existing gas extraction devices are complicated to operate and the internal sealing ring is prone to leakage during wear, thereby affecting the pressurization efficiency. The gas extraction mechanism drives the first mounting plate and the second mounting plate to slide back and forth in the pressurization cylinder, so that the low-pressure oil, gas and water mixture in the input pipe is pressurized and output to the output pipe for discharge. When the first mounting plate and the second mounting plate slide back and forth through the sealing mechanism, the sealing ring is pushed toward the inner wall of the pressurization cylinder to improve the sealing performance, and the sealing ring is intermittently driven to rotate, changing the position of the sealing ring and the inner wall of the pressurization cylinder, so that the wear of the sealing ring is more uniform around the four sides, and the service life of the sealing ring is extended. There is no need to separate gas and liquid, and the gas extraction efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0019] Figure 3 It is a schematic diagram of the local structure of the gas extraction mechanism of the present invention;

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

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

[0022] Figure 6 for Figure 5 A magnified image of area A;

[0023] Figure 7 for Figure 6 Enlarged view of area B;

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

[0025] Fig. 9 for Figure 8 Enlarged view of area C.

[0026] In the figure: 1. hydraulic oil tank; 2. input pipe; 3. output pipe; 4. oil pump; 5. pressurizing cylinder; 6. first mounting plate; 7. second mounting plate; 8. sealing ring; 9. pressurizing cylinder; 10. fixing plate; 11. intake pipe; 12. exhaust pipe; 13. driving plate; 15. driving rod; 16. oil delivery pipe; 17. threaded rod; 18. first mounting ring; 19. second mounting ring; 20. pushing block; 21. sliding groove; 22. first tension spring; 23. bellows; 24. first driving plate; 25. second driving plate; 26. first oblique gear ring; 27. second oblique gear ring; 28. first push rod; 29. ​​annular groove; 30. first pipeline; 31. second pipeline; 32. second push rod; 33. fixing ring; 34. second tension spring; 35. return spring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1

[0029] See also Figure 1-Figure 4 , a negative pressure gas extraction device shown in the figure includes a hydraulic oil tank 1, a gas extraction mechanism, a sealing mechanism, an input pipe 2 and an output pipe 3. The hydraulic oil tank 1 is connected to multiple groups of oil pumps 4. 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 extraction mechanism includes multiple groups of pressurizing cylinders 5. The pressurizing cylinders 5 are slidably connected with a first mounting plate 6 and a second mounting plate 7. A sealing ring 8 that is slidably fitted with the inner wall of the pressurizing cylinder 5 is provided between the first mounting plate 6 and the second mounting plate 7. It is used to drive the first mounting plate 6 to move the second mounting plate 7 to the inner wall of the pressurizing cylinder 5. The first mounting plate 6 and the second mounting plate 7 slide back and forth in the pressurizing cylinder 5, thereby pressurizing the low-pressure oil-gas-water mixture in the input pipe 2 and outputting it to the output pipe 3 for discharge. The sealing mechanism is installed in the pressurizing cylinder 5, and is used to push the sealing ring 8 to the inner wall of the pressurizing cylinder 5 when the first mounting plate 6 and the second mounting plate 7 slide back and forth, so as to improve the sealing performance, and intermittently drive the sealing ring 8 to rotate, so as to change the position where the sealing ring 8 fits the inner wall of the pressurizing cylinder 5, so that the wear around the sealing ring 8 is more uniform, thereby extending the service life of the sealing ring 8.

[0030] The gas extraction mechanism also includes a pressure cylinder 9 installed on the ground through a bracket. Both ends of the pressure cylinder 9 are fixedly connected with fixed plates 10. The fixed plates 10 on both sides are respectively fixedly connected to the pressure cylinder 5. The pressure cylinder 5 is connected with two groups of intake pipes 11 connected to the input pipe 2. The pressure cylinder 5 is connected with two groups of exhaust pipes 12 connected to the output pipe 3. The two groups of intake pipes 11 and exhaust pipes 12 on the same pressure cylinder 5 are respectively located on both sides of the sealing ring 8. A driving member for driving the first mounting plate 6 and the second mounting plate 7 to slide back and forth is provided in the pressure cylinder 9.

[0031] The driving member includes a driving disk 13 which is slidably connected to the inner wall of the pressurizing cylinder 9, and a driving rod 15 is fixedly connected to the driving disk 13. The driving rod 15 passes through the fixed plates 10 on both sides and is slidably connected to the inner walls of the fixed plates 10. The two ends of the driving rod 15 are respectively fixedly connected to the first mounting disks 6 on both sides. The pressurizing cylinder 9 is connected with two groups of oil pipes 16 which are connected to the oil pump 4 and the hydraulic oil tank 1 through electromagnetic reversing valves. The intake pipe 11 and the exhaust pipe 12 are respectively provided with one-way valves for controlling the one-way input of the fluid from the intake pipe 11 into the pressurizing cylinder 5 and the one-way output to the exhaust pipe 12 after pressurization.

[0032] When the oil pump 4 is turned on, the oil pump 4 and the oil pump 4 are turned on and the oil is turned off, so the oil pump 4 will be turned on and the oil is turned off.

[0033] When the first mounting disk 6 and the second mounting disk 7 drive 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 pressurizing cylinders 5 on both sides through the intake pipe 11. In the pressurizing cylinder 5, the fluid on one side will be 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 disk 6 increases, generating negative pressure, and the fluid in the intake pipe 11 is drawn into the pressurizing cylinder 5 on that side through the one-way valve. After that, the first mounting disk 6 switches the moving direction, and the fluid on that side can be pressurized again and transported to the exhaust pipe 12 through the one-way valve for output to the output pipe 3. The device has a stable and efficient structure, does not need to separate and pressurize the gas and liquid, and is more convenient to operate.

[0034] Embodiment 2

[0035] See also Figure 3-Figure 9 The present embodiment further illustrates the first embodiment. The sealing mechanism shown in the figure further includes a threaded rod 17 rotatably connected to the second mounting disk 7. The threaded rod 17 can be threadedly connected to the first mounting disk 6. A first mounting ring 18 is rotatably connected to the side of the first mounting disk 6. A second mounting ring 19 is rotatably connected to the side of the second mounting disk 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 members for controlling the sealing state of the sealing ring 8.

[0036] The sealing member includes a plurality of push blocks 20 mounted on the second mounting ring 19. The first mounting ring 18 and the second mounting ring 19 are provided with a plurality of sliding grooves 21 that can be slidably connected to 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 plugged 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 a control member for driving the push block 20 to move and controlling the sealing ring 8 to rotate.

[0037] The control component includes two groups of bellows 23 fixedly mounted on the first mounting plate 6 and the second mounting plate 7 respectively. The first mounting plate 6 is slidably connected in the horizontal direction with 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 with 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.

[0038] The rotating member includes two groups of first bevel gear 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 respectively fixedly connected to the second bevel gear rings 27. The inclined surfaces of the first bevel gear rings 26 on both sides can alternately slide and contact with the inclined surfaces of the second bevel gear rings 27 on both sides. The second bevel gear rings 27 are provided with a pushing member for pushing the pushing block 20 to contact the inner wall of the sealing ring 8 during rotation.

[0039] The pushing member includes multiple groups of first push rods 28 installed in the first mounting ring 18, and annular grooves 29 are respectively provided on the first mounting plate 6 and the second mounting plate 7. The first mounting plate 6 and the second mounting plate 7 are provided with a first pipe 30 for connecting the annular groove 29 and the bellows 23. The first mounting ring 18, the second mounting ring 19 and the second bevel gear ring 27 are provided with a second pipe 31 connected to the annular groove 29. The first push rod 28 is slidably connected to the second pipe 31 in the first mounting ring 18, and a second push rod 32 is slidably connected in the second pipe 31 on the second mounting ring 19.

[0040] A fixing ring 33 is fixedly connected in the second pipe 31, and one end of the first push rod 28 and the second push rod 32 are respectively fixedly connected to a second tension spring 34 fixedly connected to the fixing ring 33, and the first drive plate 24 and the second drive plate 25 are respectively fixedly connected to a return spring 35 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 sleeved on the outside of the second mounting ring 19, and the second mounting plate 7 is aligned and close to the first mounting plate 6, so that the sealing ring 8 is sleeved on the outside of the first mounting ring 18, and at the same time, the push block 20 is inserted into the sliding groove 21 on the first mounting ring 18, and then the threaded rod 17 is rotated to fix the first mounting plate 6 and the second mounting plate 7, while also ensuring the fixation of the position of the sealing ring 8. Similarly, when disassembling, the threaded rod 17 can be directly unscrewed to remove the second mounting plate 7 and the sealing ring 8, which is convenient for replacement and use.

[0042] During use, as the first mounting plate 6 and the second mounting plate 7 slide back and forth in the pressurizing cylinder 5, when sliding toward the side of the second mounting plate 7, the pressure on the side of the second mounting plate 7 is greater, and the pressure on the side of the first mounting plate 6 is smaller. At this time, the fluid in the pressurizing cylinder 5 pushes the second driving plate 25, so that the bellows 23 on this side is compressed, and at the same time, the first bevel gear ring 26 on the second driving plate 25 is pushed toward the second bevel gear ring 27 on the second mounting ring 19, so that the second bevel gear ring 27 is pushed by the inclined surface of the first bevel gear ring 26, driving the second mounting ring 19 and the sealing ring 8 to rotate slightly, thereby changing the position in which the sealing ring 8 slides against the inner wall of the pressurizing cylinder 5, and avoiding the situation in which the fixed position on the sealing ring 8 is continuously worn due to the uneven inner wall of the pressurizing cylinder 5 or the presence of granular impurities at the bottom of the pressurizing cylinder 5, thereby affecting the sealing performance of this position.

[0043] At this time, the second driving plate 25 on the other side is in a state of being pushed out by the return spring 35, and the first bevel gear ring 26 on this side is not in contact with the second bevel gear ring 27. The second mounting ring 19 will drive the pushing block 20 to rotate together with the first bevel gear ring 18 in the process of driving the sealing ring 8 to rotate. The first mounting ring 18 drives the second bevel gear ring 27 on this side to rotate, so that the first bevel gear ring 26 on this side can push the second bevel gear ring 27 to rotate slightly through the inclined surface when it approaches the second bevel gear ring 27 next time. This reciprocating process can intermittently drive the first mounting ring 18, the second mounting ring 19 and the sealing ring 8 to rotate and switch together during the reciprocating movement of the sealing ring 8.

[0044] It is worth noting that: when the bellows 23 on one side is compressed, the internal hydraulic oil 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 up, so 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, and the sealing strength with the inner wall of the pressurizing cylinder 5 is improved. At this time, the bellows 23 on the other side is in a suction state, and the second tension spring 34 is pulled back, so that the first push rod 28 and the second push rod 32 alternately push the push block 20 to slide outward, thereby improving the supporting force on the sealing ring 8. Through the design of the annular groove 29, the second pipe 31 can always maintain a connected state with the annular groove 29 during the rotation of the second bevel gear ring 27.

[0045] The device does not require motors, chips and other components for control and drive, has a simple and stable structure, and can automatically realize the functions of switching and resisting during the reciprocating sliding of the sealing ring 8, thereby ensuring a good sealing effect during use and effectively extending the service life of the equipment.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A negative pressure gas collection device, characterized in that: include: A hydraulic oil tank (1), an input pipe (2) and an output pipe (3), wherein the hydraulic oil tank (1) is connected to a plurality of oil pumps (4), 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; Also includes: A gas extraction mechanism, comprising a plurality of groups of pressurizing cylinders (5), wherein a first mounting plate (6) and a second mounting plate (7) are slidably connected in the pressurizing cylinders (5), and a sealing ring (8) is provided between the first mounting plate (6) and the second mounting plate (7) and is slidably fitted with the inner wall of the pressurizing cylinder (5), and is used to drive the first mounting plate (6) and the second mounting plate (7) to slide back and forth in the pressurizing cylinder (5), thereby pressurizing the low-pressure oil-gas-water mixture in the input pipe (2) and outputting it into the output pipe (3) for discharge; A sealing mechanism, which is installed in the pressurizing cylinder (5) and is used to push the sealing ring (8) toward the inner wall of the pressurizing cylinder (5) when the first mounting plate (6) and the second mounting plate (7) slide back and forth to improve the sealing performance, and intermittently drive the sealing ring (8) to rotate to change the position where the sealing ring (8) fits the inner wall of the pressurizing cylinder (5), so that the wear around the sealing ring (8) is more uniform, thereby extending the service life of the sealing ring (8); The sealing mechanism further comprises 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 a side surface of the first mounting plate (6), a second mounting ring (19) being rotatably connected to a side surface of the second mounting plate (7), the sealing ring (8) being able to be movably sleeved with outer walls of the first mounting ring (18) and the second mounting ring (19), and a sealing member for controlling the sealing state of the sealing ring (8) being provided on the first mounting ring (18) and the second mounting ring (19); The sealing member comprises a plurality of push blocks (20) mounted on the second mounting ring (19); the first mounting ring (18) and the second mounting ring (19) are provided with a plurality of sliding grooves (21) capable of being slidably connected to the outer wall of the push block (20); the push block (20) is fixedly connected to a first tension spring (22) fixedly connected to the second mounting ring (19); the push block (20) can be plugged into the sliding groove (21) on the first mounting ring (18); and the first mounting plate (6) and the second mounting plate (7) are provided with a control member for driving the push block (20) to move and controlling the sealing ring (8) to rotate; The control component comprises two groups of bellows (23) respectively fixedly mounted on the first mounting plate (6) and the second mounting plate (7); a first drive plate (24) fixedly connected to one end of the bellows (23) on the first mounting plate (6) is slidably connected in a horizontal direction on the first mounting plate (6); a second drive plate (25) fixedly connected to one end of the bellows (23) on the second mounting plate (7) is slidably connected in a horizontal direction on the second mounting plate (7); hydraulic oil is stored in the bellows (23); and a rotating member for driving the sealing ring (8) to rotate is provided on the first drive plate (24) and the second drive plate (25); The rotating member comprises two groups of first beveled gear rings (26) respectively fixedly connected to the first drive plate (24) and the second drive plate (25); the first mounting ring (18) and the second mounting ring (19) are respectively fixedly connected with second beveled gear rings (27); the inclined surfaces of the first beveled gear rings (26) on both sides can alternately slide against the inclined surfaces of the second beveled gear rings (27) on both sides; and the second beveled gear rings (27) are provided with a pushing member for pushing the pushing block (20) to contact the inner wall of the sealing ring (8) during the rotation process.

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

3. A negative pressure gas extraction device according to claim 2, characterized in that: The driving member comprises a driving disk (13) slidably connected to the inner wall of the pressurizing cylinder (9), a driving rod (15) fixedly connected to the driving disk (13), the driving rod (15) passing through the fixing plates (10) on both sides and slidably connected to the inner walls of the fixing plates (10), the two ends of the driving rod (15) being fixedly connected to the first mounting disks (6) on both sides respectively, and the pressurizing cylinder (9) is connected to two groups of oil delivery pipes (16) connected to the oil pump (4) and the hydraulic oil tank (1) through electromagnetic reversing valves.

4. A negative pressure gas extraction device according to claim 1, characterized in that: The pushing member comprises a plurality of first push rods (28) mounted in the first mounting ring (18); an annular groove (29) is respectively formed on the first mounting plate (6) and the second mounting plate (7); a first pipe (30) for connecting the annular groove (29) and the corrugated pipe (23) is formed on the first mounting plate (6) and the second mounting plate (7); a second pipe (31) connected to the annular groove (29) is formed on the first mounting ring (18), the second mounting ring (19) and the second bevel gear ring (27); the first push rod (28) is slidably connected to the second pipe (31) in the first mounting ring (18); and a second push rod (32) is slidably connected to the second pipe (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) fixedly connected to the fixing ring (33); and the first drive plate (24) and the second drive plate (25) are respectively fixedly connected to a return spring (35) 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: The air intake pipe (11) and the exhaust pipe (12) are each provided with a one-way valve for controlling the one-way input of fluid from the air intake pipe (11) into the pressurizing cylinder (5) and the one-way output of fluid to the exhaust pipe (12) after pressurization.

Images