Drainage device for gas control

Abstract

The invention discloses a drainage device for gas control, which is provided with a sealing mechanism, so that a drainage pipe can be well sealed, and the suction effect of subsequent negative pressure suction can be conveniently ensured. The uniform grouting assembly is used for uniformly injecting an expansion curing agent into each injection sealing cavity, so that the uniform sealing performance of the outer circumferential side of the drainage pipe is effectively ensured, the problem of poor local sealing effect is prevented, and the sealing capability and the sealing convenience are improved; during sealing, the annular grouting main pipe is arranged, and the sealing grouting branch pipes are used for uniformly injecting an expansion curing agent into each injection sealing cavity, so that uniform sealing of each position is effectively guaranteed, and the sealing effect and sealing capacity of each position are guaranteed; and the problems of poor sealing and long-time waiting for repeated injection caused by non-uniform flowing of the curing agent are prevented.

Description

Technical Field

[0001] The present invention specifically relates to a gas drainage device for gas management and relates to the field of gas drainage equipment. Background Art

[0002] During coal mining, various technical means are used to remove gas from the coal seam or surrounding rock to prevent accidents caused by gas accumulation. Currently, ventilation and gas extraction are the most widely used methods. Ventilation can only dilute and remove relatively low-density gas. When the gas outflow is large and ventilation alone is difficult to dilute and remove, extraction is generally used to remove the gas and reduce the ventilation burden. During gas extraction, a drainage hole is usually formed by drilling, and then a drainage pipe is inserted into the hole. A vacuum pump is then connected to the drainage pipe to pump the gas from the coal seam or mining area to the surface.

[0003] In gas extraction, since it is a negative pressure extraction, the sealing performance between the extraction pipe and the extraction hole is one of the factors that directly affect the extraction effect. At the same time, since the extraction hole is drilled, its depth is generally deep. During gas extraction and when the extraction pipe is inserted into the extraction hole, it is easy for the extraction hole to be blocked. In particular, as the extraction process progresses, the suction effect will cause the dust in the fracture gap to be blocked and accumulated. Over time, it is easy for the extraction point to be blocked and other problems to occur, affecting the extraction effect. Summary of the Invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a gas drainage device for gas treatment.

[0005] The present invention is achieved in this way: a gas treatment extraction device is constructed, which includes an extraction pipe, a sealing mechanism and a backwash mechanism. The extraction pipe is sealed and penetrates into the extraction hole from the center of the sealing mechanism; the sealing mechanism is connected to the backwash mechanism, which is characterized in that the sealing mechanism is sealed and installed between the inner wall of the end of the extraction hole and the outer wall of the extraction pipe. The backwash mechanism can allow the backwash liquid to flow into the extraction hole from the cavity between the outer wall of the extraction pipe and the inner wall of the extraction hole, and the backwash liquid can be extracted from the inner tube hole of the extraction pipe to flush the extraction hole.

[0006] Further, as a preference, the sealing mechanism includes a pressure-equalizing sealing cover assembly and an upper connecting cover assembly, the pressure-equalizing sealing cover assembly is coaxially sleeved at the port of the pumping hole, a plurality of pressure-equalizing isolation plates are arranged in an inner circumferential array of the pressure-equalizing sealing cover assembly, an injection sealing cavity is constructed between two adjacent pressure-equalizing isolation plates, and an expansion curing agent is injected into the injection sealing cavity, and an upper connecting cover assembly is connected to the side of the pressure-equalizing sealing cover assembly facing the outer end of the pumping hole, the upper connecting cover assembly can be connected to the injection sealing cavity, and the backwash mechanism is connected to the upper connecting cover assembly, and the upper connecting cover assembly can be connected to the cavity between the outer wall of the pumping pipe and the inner wall of the pumping hole.

[0007] Further, as a preference, the pressure-equalizing sealing cover assembly includes an outer annular cover, an inner annular cover and an outer convex cover, the outer annular cover and the inner annular cover are coaxially arranged and axially spaced, the two ends of a plurality of the pressure-equalizing isolation plates are respectively connected between the outer annular cover and the inner annular cover, the centers of the outer annular cover, the inner annular cover and the outer convex cover are all provided with coaxial through holes, the outer convex cover is a cylindrical ring structure protruding from the inner annular cover, and the outer convex cover is axially protruding outward along the inner wall of the through hole, the inner annular cover is coaxially provided with an installation positioning groove on the outside of the outer convex cover, the installation positioning groove is provided with a uniform grouting assembly, and the uniform grouting assembly is used to uniformly inject expansion curing agent into each injection sealing cavity.

[0008] Further, as a preference, the uniform grouting assembly includes an annular grouting main pipe, a sealed grouting branch pipe and a grouting inlet joint. The annular grouting main pipe positioning card is arranged at the installation positioning groove. A plurality of sealed grouting branches are arranged in a circular array on the side of the annular grouting main pipe facing the injection sealing cavity. Each of the injection sealing cavities is connected with at least one sealed grouting branch pipe. At least two grouting inlet joints are arranged on the side of the annular grouting main pipe away from the sealed grouting branch pipe. The grouting inlet joints are connected to the upper connecting cover assembly.

[0009] Furthermore, preferably, a plurality of avoidance holes are arranged in a circumferential array on the installation positioning groove, and each of the sealing grouting branch pipes is arranged through its own avoidance hole.

[0010] Further, as a preference, the upper connecting cover assembly includes an annular cover, which is coaxially fixed on the outside of the outer annular cover, and is provided with a first sealed grouting connecting pipe and a second sealed grouting connecting pipe, and the first sealed grouting connecting pipe and the second sealed grouting connecting pipe are respectively connected to the slurry inlet joint.

[0011] Furthermore, as a preference, a first backwash liquid inlet pipe and a second backwash liquid inlet pipe are connected to the annular cover, and the first backwash liquid inlet pipe and the second backwash liquid inlet pipe pass through the annular cover and the pressure equalizing sealing cover assembly in sequence and are connected to the cavity between the outer wall of the pumping pipe and the inner wall of the pumping hole, and a high-pressure flushing nozzle connected to the inner ends of the first backwash liquid inlet pipe and the second backwash liquid inlet pipe is provided on the inner side of the inner annular cover, and the backwash mechanism includes a backwash high-pressure pump and a suction flushing pump, and the backwash high-pressure pump is connected to the first backwash liquid inlet pipe and the second backwash liquid inlet pipe through a high-pressure pipeline, and the suction flushing pump is connected to the outer end of the pumping pipe.

[0012] Furthermore, as a preference, an axial force sealing assembly is also provided between the inner wall of the through hole of the pressure equalizing sealing cover assembly and the outer wall of the pumping and discharge pipe. When the expansion curing agent is injected into the sealing cavity and expands, the expansion force of the expansion curing agent can enable the axial force sealing assembly to seal against the inner wall of the through hole and the outer wall of the pumping and discharge pipe.

[0013] Further, as a preference, the axial force sealing assembly includes an outer abutting sealing cone sleeve, an inner abutting sealing cone sleeve, an intermediate cylindrical sleeve, an outer pressure sleeve and an inner pressure sleeve, the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are respectively integrally formed and connected at the axial ends of the intermediate cylindrical sleeve, the pumping and discharge pipe is arranged through the center holes of the outer abutting sealing cone sleeve, the intermediate cylindrical sleeve and the inner abutting sealing cone sleeve in sequence, the outer pressure sleeve is provided on the intermediate cylindrical sleeve at one side of the outer abutting sealing cone sleeve, the inner pressure sleeve is provided on the intermediate cylindrical sleeve at one side of the inner abutting sealing cone sleeve, the inner hole of the outer pressure sleeve is a conical structure that cooperates with the outer cone wall of the outer abutting sealing cone sleeve, and the inner hole of the inner pressure sleeve is a conical structure that cooperates with the outer cone wall of the inner abutting sealing cone sleeve.

[0014] Furthermore, as a preference, the center holes of the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are both circular structures, and the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are both provided with open deformation grooves extending along the axial direction, and the axial force sealing assembly also includes an axial limit ring, which is fixedly sleeved on the pumping pipe, and the axial limit ring is used to limit the axial direction of the inner abutting sealing cone sleeve.

[0015] The present invention has the following advantages: Compared with similar equipment, the gas drainage device provided by the present invention has the following advantages:

[0016] (1) The gas treatment extraction device described in the present invention can achieve good sealing of the extraction pipe by setting a sealing mechanism, which is convenient for ensuring the suction effect of subsequent negative pressure suction. The present invention provides multiple injection sealing cavities constructed by setting a pressure-equalizing isolation plate, and uses a uniform grouting component to uniformly inject an expansion curing agent into each injection sealing cavity, effectively ensuring the uniform sealing performance of the outer circumference of the extraction pipe, preventing the problem of poor local sealing effect, and improving the sealing ability and sealing convenience;

[0017] (2) During sealing, the present invention provides an annular grouting main pipe and utilizes a sealing grouting branch pipe to uniformly inject the expansion curing agent into each injection sealing cavity, thereby effectively ensuring uniform sealing at each position, ensuring the sealing effect and sealing capacity at each position, and preventing the problem of poor sealing caused by uneven curing agent flow and the need to wait for multiple injections for a long time;

[0018] (3) The present invention provides an axial force sealing component. When the expansion curing agent is injected into the sealing cavity and expands, the expansion force of the expansion curing agent can make the axial force sealing component seal against the inner wall of the through hole and the outer wall of the pumping tube, effectively ensuring the sealing ability and sealing effect at the outer wall of the pumping tube, improving the sealing reliability, and its conical matching structure can effectively expand and squeeze the seal after deformation;

[0019] (4) The present invention can effectively flush the extraction hole by setting a backwash mechanism, prevent problems such as blockage, and improve the extraction capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the top-down three-dimensional structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the extraction and discharge device and the extraction and discharge hole in the present invention in cooperation and sealing;

[0023] Figure 4 It is a schematic structural diagram of the axial force sealing assembly of the present invention;

[0024] Figure 5 It is a schematic diagram of the disassembled structure of the uniform grouting assembly and the pressure-equalizing sealing cover assembly of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the uniform grouting assembly of the present invention;

[0026] Among them, 1. the first backwash inlet pipe; 2. the first sealing grouting connecting pipe; 3. the upper connecting cover assembly; 4. the pressure-equalizing sealing cover assembly; 5. the pumping pipe; 6. the second sealing grouting connecting pipe; 7. the second backwash inlet pipe; 8. the cavity between the outer wall of the pumping pipe and the inner wall of the pumping hole; 9. the inner wall of the end of the pumping hole; 10. the high-pressure flushing nozzle; 11. the through hole; 12. the outer pressure sleeve; 13. the outer abutting sealing cone sleeve; 14. the middle cylindrical sleeve; 15. the inner pressure sleeve; 16. the inner abutting sealing cone sleeve; 40. the outer convex cover; 41. the avoidance hole; 42. the installation positioning groove; 43. the outer annular cover; 44. the pressure-equalizing isolation plate; 45. the inner annular cover; 46. the injection sealing cavity; 47. the slurry inlet joint; 48. the annular grouting main pipe; 49. the sealing grouting branch pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the Figure 1-6 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] The present invention provides an improved extraction device for gas treatment, which includes: an extraction pipe 5, a sealing mechanism and a backwashing mechanism, wherein the extraction pipe 5 is sealed and penetrates into the extraction hole from the center of the sealing mechanism; the sealing mechanism is connected to the backwashing mechanism, and the sealing mechanism is sealed and installed between the inner wall 9 of the end of the extraction hole and the outer wall of the extraction pipe 5. The backwashing mechanism can make the backwashing liquid flow into the extraction hole from the cavity 8 between the outer wall of the extraction pipe 5 and the inner wall of the extraction hole, and the backwashing liquid can be extracted from the inner tube hole of the extraction pipe 5 to flush the extraction hole 5.

[0029] In this embodiment, the sealing mechanism includes a pressure-equalizing sealing cover assembly 4 and an upper connecting cover assembly 3. The pressure-equalizing sealing cover assembly 4 is coaxially sleeved at the port of the pumping hole. A plurality of pressure-equalizing isolation plates 44 are arranged in an inner circumferential array of the pressure-equalizing sealing cover assembly 4. An injection sealing cavity 46 is constructed between two adjacent pressure-equalizing isolation plates 44. An expansion curing agent is injected into the injection sealing cavity 45. The side of the pressure-equalizing sealing cover assembly 4 facing the outer end of the pumping hole is connected to the upper connecting cover assembly 3. The upper connecting cover assembly 3 can be connected to the injection sealing cavity 45, and the backwash mechanism is connected to the upper connecting cover assembly 3, and the upper connecting cover assembly 3 can be connected to the cavity 8 between the outer wall of the pumping pipe 5 and the inner wall of the pumping hole.

[0030] Among them, the pressure-equalizing sealing cover assembly includes an outer annular cover 43, an inner annular cover 45 and an outer convex cover 40, and the outer annular cover 43 and the inner annular cover 45 are coaxially and axially spaced. The two ends of multiple pressure-equalizing isolation plates 44 are respectively connected between the outer annular cover 43 and the inner annular cover 45. The centers of the outer annular cover 43, the inner annular cover 45 and the outer convex cover 40 are all provided with coaxial through holes 11. The outer convex cover 40 is a cylindrical ring structure protruding from the inner annular cover, and the outer convex cover 40 is axially protruding outward along the inner wall of the through hole. The inner annular cover 45 is coaxially provided with an installation positioning groove 42 on the outside of the outer convex cover, and a uniform grouting assembly is provided on the installation positioning groove 42. The uniform grouting assembly is used to uniformly inject expansion curing agent into each injection sealing cavity.

[0031] In the present invention, the uniform grouting assembly includes an annular grouting main pipe 48, a sealed grouting branch pipe 49 and a grouting joint 47. The annular grouting main pipe 48 is positioned at the installation positioning groove 42. A plurality of sealed grouting branches 49 are arranged in a circular array on the side of the annular grouting main pipe 48 facing the injection sealing cavity. Each injection sealing cavity is connected to at least one sealed grouting branch pipe 49. At least two grouting joints 47 are arranged on the side of the annular grouting main pipe away from the sealed grouting branch pipe. The grouting joints are connected to the upper connecting cover assembly.

[0032] As a preferred embodiment, a plurality of avoidance holes 41 are arranged in a circumferential array on the installation positioning groove 42 , and each of the sealing grouting branch pipes is arranged through its own avoidance hole 41 .

[0033] The upper connecting cover assembly 3 includes an annular cover, which is coaxially fixed on the outside of the outer annular cover. The annular cover is provided with a first sealing grouting connection pipe 2 and a second sealing grouting connection pipe 6. The first sealing grouting connection pipe 2 and the second sealing grouting connection pipe 6 are respectively connected to the slurry inlet joint 47.

[0034] As a better embodiment, the annular cover is connected to a first backwash liquid inlet pipe 1 and a second backwash liquid inlet pipe 7, and the first backwash liquid inlet pipe 1 and the second backwash liquid inlet pipe 7 pass through the annular cover and the pressure equalizing sealing cover assembly in sequence and are connected to the cavity between the outer wall of the pumping pipe and the inner wall of the pumping hole. The inner side of the inner annular cover is provided with a high-pressure flushing nozzle 10 connected to the inner ends of the first backwash liquid inlet pipe and the second backwash liquid inlet pipe. The backwash mechanism includes a backwash high-pressure pump and a suction flushing pump. The backwash high-pressure pump is connected to the first backwash liquid inlet pipe and the second backwash liquid inlet pipe through a high-pressure pipeline, and the suction flushing pump is connected to the outer end of the pumping pipe.

[0035] In addition, in the present invention, an axial force sealing assembly is further provided between the inner wall of the through hole of the pressure equalizing sealing cover assembly and the outer wall of the pumping and discharge pipe. When the expansion curing agent is injected into the sealing cavity and expands, the expansion force of the expansion curing agent can enable the axial force sealing assembly to seal against the inner wall of the through hole and the outer wall of the pumping and discharge pipe.

[0036] As one of the preferred embodiments, the axial force sealing assembly includes an outer abutting sealing cone sleeve 13, an inner abutting sealing cone sleeve 16, an intermediate cylindrical sleeve 14, an outer pressure sleeve 12 and an inner pressure sleeve 15. The outer abutting sealing cone sleeve 13 and the inner abutting sealing cone sleeve 16 are respectively integrally formed and connected to the axial ends of the intermediate cylindrical sleeve 14. The pumping pipe 5 is arranged through the center holes of the outer abutting sealing cone sleeve 13, the intermediate cylindrical sleeve 14 and the inner abutting sealing cone sleeve 16 in sequence. The outer pressure sleeve 12 is provided on the intermediate cylindrical sleeve 14 on one side of the outer abutting sealing cone sleeve, and the inner pressure sleeve 15 is provided on the intermediate cylindrical sleeve on one side of the inner abutting sealing cone sleeve. The inner hole of the outer pressure sleeve 12 is a conical structure that cooperates with the outer cone wall of the outer abutting sealing cone sleeve 13, and the inner hole of the inner pressure sleeve 15 is a conical structure that cooperates with the outer cone wall of the inner abutting sealing cone sleeve.

[0037] The center holes of the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are both circular structures, and the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are both provided with open deformation grooves extending along the axial direction. The axial force sealing assembly also includes an axial limit ring 17, which is fixedly sleeved on the pumping pipe 5, and the axial limit ring 17 is used to limit the axial direction of the inner abutting sealing cone sleeve 16.

[0038] The present invention relates to a gas treatment and extraction device, which can achieve good sealing treatment of the extraction pipe by setting a sealing mechanism, so as to ensure the suction effect of subsequent negative pressure suction. The present invention provides a plurality of injection sealing cavities constructed by arranging pressure-equalizing isolation plates, and uses a uniform grouting component to uniformly inject an expansion curing agent into each injection sealing cavity, thereby effectively ensuring the uniform sealing performance of the outer circumference side of the extraction pipe, preventing the problem of poor local sealing effect, and improving the sealing ability and sealing convenience. When sealing, the present invention provides an annular grouting main pipe, and uses a sealing grouting branch pipe to uniformly inject an expansion curing agent into each injection sealing cavity, thereby effectively ensuring uniform sealing at each position. Uniform sealing ensures the sealing effect and sealing ability of each position, prevents the problem of poor sealing caused by uneven flow of curing agent and the need to wait for multiple injections for a long time; the present invention sets an axial force sealing component, and when the expansion curing agent is injected into the sealing cavity and expands, the expansion force of the expansion curing agent can make the axial force sealing component seal against the inner wall of the through hole and the outer wall of the extraction and discharge pipe, effectively ensuring the sealing ability and sealing effect at the outer wall of the extraction and discharge pipe, and improving the sealing reliability. Its conical matching structure can effectively expand the seal after extrusion deformation; the present invention sets a backwashing mechanism, which can effectively realize the flushing in the extraction and discharge hole, prevent problems such as blockage, and improve the extraction capacity.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0040] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas treatment extraction device, comprising an extraction pipe (5), a sealing mechanism and a backwash mechanism, wherein the extraction pipe (5) is sealed and penetrates into the extraction hole from the center of the sealing mechanism; the sealing mechanism is connected to the backwash mechanism, characterized in that: The sealing mechanism is sealingly installed between the inner wall (9) of the end of the extraction hole and the outer wall of the extraction pipe (5); the backwashing mechanism can allow the backwashing liquid to flow into the extraction hole from the cavity (8) between the outer wall of the extraction pipe (5) and the inner wall of the extraction hole, and the backwashing liquid can be extracted from the inner tube hole of the extraction pipe (5) to flush the extraction hole.

2. A gas drainage device for gas treatment according to claim 1, characterized in that: The sealing mechanism includes a pressure-equalizing sealing cover assembly (4) and an upper connecting cover assembly (3), wherein the pressure-equalizing sealing cover assembly (4) is coaxially sleeved at the port of the pumping hole, and a plurality of pressure-equalizing isolation plates (44) are arranged in an array on the inner circumference of the pressure-equalizing sealing cover assembly, and an injection sealing cavity (45) is constructed between two adjacent pressure-equalizing isolation plates (44), and an expansion curing agent is injected into the injection sealing cavity. The side of the pressure-equalizing sealing cover assembly facing the outer end of the pumping hole is connected to the upper connecting cover assembly, and the upper connecting cover assembly (3) can be connected to the injection sealing cavity, and the backwash mechanism is connected to the upper connecting cover assembly (3), and the upper connecting cover assembly can be connected to the cavity between the outer wall of the pumping pipe and the inner wall of the pumping hole.

3. A gas drainage device for gas treatment according to claim 2, characterized in that: The pressure-equalizing sealing cover assembly comprises an outer annular cover (43), an inner annular cover (45) and an outer convex cover (40), wherein the outer annular cover (43) and the inner annular cover (45) are coaxially arranged and axially spaced, and the two ends of a plurality of pressure-equalizing isolation plates (44) are respectively connected between the outer annular cover and the inner annular cover, and the centers of the outer annular cover, the inner annular cover and the outer convex cover are all provided with a coaxial through hole (11), and the outer convex cover is a cylindrical ring structure protruding from the inner annular cover, and the outer convex cover is axially protruding outward along the inner wall of the through hole, and the inner annular cover (45) is coaxially provided with an installation positioning groove (42) on the outer side of the outer convex cover, and the installation positioning groove (42) is provided with a uniform grouting assembly, and the uniform grouting assembly is used to uniformly inject an expansion curing agent into each injection sealing cavity.

4. A gas drainage device for gas treatment according to claim 3, characterized in that: The uniform grouting assembly comprises an annular grouting main pipe (48), a sealed grouting branch pipe (49) and a grouting joint (47); the annular grouting main pipe (48) is positioned at the installation positioning groove (42); a plurality of sealed grouting branch pipes (49) are arranged in a circumferential array on the side of the annular grouting main pipe (48) facing the injection sealing cavity; each injection sealing cavity is connected to at least one of the sealed grouting branch pipes; at least two grouting joints (47) are arranged on the side of the annular grouting main pipe away from the sealed grouting branch pipe; the grouting joints are connected to the upper connection cover assembly.

5. A gas drainage device for gas treatment according to claim 4, characterized in that: A plurality of avoidance holes (41) are arranged in a circumferential array on the installation positioning groove, and each of the sealing grouting branch pipes is arranged through its own avoidance hole (41).

6. The gas drainage device according to claim 3, characterized in that: The upper connection cover assembly (3) comprises an annular cover, which is coaxially fixed on the outside of the outer annular cover. A first sealed grouting connection pipe and a second sealed grouting connection pipe are provided on the annular cover. The first sealed grouting connection pipe (2) and the second sealed grouting connection pipe (6) are respectively connected to the grouting joint (47).

7. A gas drainage device for gas treatment according to claim 6, characterized in that: The annular cover is connected to a first backwash liquid inlet pipe (1) and a second backwash liquid inlet pipe (7). The first backwash liquid inlet pipe (1) and the second backwash liquid inlet pipe (7) pass through the annular cover and the pressure-equalizing sealing cover assembly in sequence and are connected to the cavity between the outer wall of the pumping pipe and the inner wall of the pumping hole. The inner side of the inner annular cover is provided with a high-pressure flushing nozzle (10) connected to the inner ends of the first backwash liquid inlet pipe and the second backwash liquid inlet pipe. The backwash mechanism includes a backwash high-pressure pump and a suction flushing pump. The backwash high-pressure pump is connected to the first backwash liquid inlet pipe and the second backwash liquid inlet pipe through a high-pressure pipeline, and the suction flushing pump is connected to the outer end of the pumping pipe.

8. A gas drainage device for gas treatment according to claim 7, characterized in that: An axial force sealing assembly is also provided between the inner wall of the through hole of the pressure equalizing sealing cover assembly and the outer wall of the pumping and discharge pipe. When the expansion curing agent is injected into the sealing cavity and expands, the expansion force of the expansion curing agent can enable the axial force sealing assembly to seal against the inner wall of the through hole and the outer wall of the pumping and discharge pipe.

9. A gas drainage device for gas treatment according to claim 8, characterized in that: The axial force sealing assembly includes an outer abutting sealing cone sleeve (13), an inner abutting sealing cone sleeve (16), an intermediate cylindrical sleeve (14), an outer pressure sleeve (12) and an inner pressure sleeve (15), the outer abutting sealing cone sleeve (13) and the inner abutting sealing cone sleeve (16) are respectively integrally formed and connected to the axial ends of the intermediate cylindrical sleeve, the pumping pipe (5) is sequentially passed through the center holes of the outer abutting sealing cone sleeve, the intermediate cylindrical sleeve and the inner abutting sealing cone sleeve, the outer pressure sleeve (12) is provided on the intermediate cylindrical sleeve (14) on one side of the outer abutting sealing cone sleeve, and the inner pressure sleeve (15) is provided on the intermediate cylindrical sleeve on one side of the inner abutting sealing cone sleeve, the inner hole of the outer pressure sleeve (12) is a conical structure matched with the outer cone wall of the outer abutting sealing cone sleeve, and the inner hole of the inner pressure sleeve (15) is a conical structure matched with the outer cone wall of the inner abutting sealing cone sleeve.

10. A gas drainage device for gas treatment according to claim 9, characterized in that: The center holes of the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are both circular structures, and the outer abutting sealing cone sleeve and the inner abutting sealing cone sleeve are both provided with an open deformation groove extending along the axial direction. The axial force sealing component also includes an axial limiting ring (17), and the axial limiting ring (17) is fixedly sleeved on the pumping pipe, and the axial limiting ring (17) is used to limit the axial direction of the inner abutting sealing cone sleeve.

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