Coal mine gas extraction and sealing device

Abstract

The present invention discloses a coal mine gas extraction and sealing device, which relates to the technical field of gas extraction; it comprises a sealing tube; an inner liner is provided in the sealing tube, and the inner liner is connected to a drill hole for gas extraction; a locking assembly and an extrusion assembly are provided in a cavity between the inner liner and the sealing tube; a through hole is provided on the tube wall of the sealing tube; the locking assembly is movably connected to the inner wall of the sealing tube; the extrusion assembly comprises a rotating rod movably connected to the sealing tube; the rotating rod is connected to an extrusion block in contact with the locking assembly; the extrusion block is pushed by the rotating rod to extend or retract the locking assembly from the through hole; the present invention ensures that the sealing tube can be in a static and stable sealing state by arranging the extrusion assembly and the locking assembly in the sealing tube, thereby enhancing the effect of gas extraction and sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of gas extraction, and in particular to a coal mine gas extraction and sealing device. Background Art

[0002] During the coal mining process, a large amount of gas in the coal seam needs to be extracted through extraction technology for reuse; the basic steps of gas extraction technology are to first drill a hole into the coal seam, then send the gas extraction pipe into the borehole, and then seal the hole; since there is a certain gap between the gas extraction pipe and the borehole wall, if this gap is not sealed and the seal is not guaranteed to be dense, otherwise there will be air-permeable gaps and the gas in the coal seam cannot be extracted.

[0003] Chinese patent announcement number: CN114396242A discloses "A coal mine gas extraction and sealing device that is easy to adjust", which includes a lifting control console, a liquid extraction pump, an external pipe seat, a gas extraction and sealing mechanism, an adjusting screw and a fixed-point switchable ground plug-in component; the liquid extraction pump is fixedly installed on the top of the lifting control console; the external pipe seat is welded to the top of the lifting control console, and the gas extraction and sealing mechanism is installed on the external pipe seat; the fixed-point switchable ground plug-in component is built-in with a mining explosion-proof motor, and the adjusting screw is installed between the output shafts of the mining explosion-proof motors built-in on the two fixed-point switchable ground plug-in components, and the lifting control console is threaded through the adjusting screw.

[0004] When the existing gas extraction sealing device is installed inside the borehole, the distribution of the force points between the sealing device and the borehole is not uniform. As a result, when the sealing device is subjected to long-term impact of high-pressure gas, it is easy for the sealing device to shift or shake in the borehole, resulting in a gap between the sealing device and the inner wall of the borehole, thereby reducing the sealing effect. Summary of the Invention

[0005] The present invention overcomes the shortcomings of the existing technology and proposes a coal mine gas extraction sealing device; through the combined locking method of the extrusion component and the locking component, the stability of the connection between the sealing pipe and the drill hole is improved, and shaking at the connection is avoided.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0007] A coal mine gas extraction and sealing device comprises a sealing tube; an inner liner is provided in the sealing tube, and the inner liner is connected to a drill hole for gas extraction; a locking assembly and an extrusion assembly are provided in a cavity between the inner liner and the sealing tube; a through hole is provided on the tube wall of the sealing tube; the locking assembly is movably connected to the inner wall of the sealing tube; the extrusion assembly comprises a rotating rod movably connected to the sealing tube; the rotating rod is connected to an extrusion block in contact with the locking assembly; the locking assembly is extended or retracted from the through hole by pushing the extrusion block by the rotating rod.

[0008] Furthermore, the locking assembly includes a locking block, a limiting plate is provided on the locking block, and the limiting plate is elastically connected to the inner wall of the sealing tube through a spring.

[0009] Furthermore, the locking block is composed of a conical locking portion and a wedge-shaped force-bearing portion, wherein the inclined edge of the force-bearing portion is adapted to the inclined edge of the extrusion block.

[0010] Furthermore, the rotating rod is spirally connected to the sealing tube, and the bottom of the rotating rod is rotatably connected to the transmission rod, and an extrusion block is provided on the transmission rod.

[0011] Furthermore, it also includes a sealing component; the sealing component includes a partition arranged on the outer wall of the sealing tube, the inner wall of the partition is provided with an expansion bag, and the expansion bag is provided with a pouring tube extending to the outside of the sealing tube, and the end of the pouring tube is provided with a pouring head.

[0012] Furthermore, a blocking component is slidably connected to the inner wall of the inner tank, and a guide block is provided on the inner wall of the inner tank; the inner tank is closed and opened by moving the blocking component to contact or separate from the guide block.

[0013] Furthermore, the plugging assembly includes an adjusting rod spirally connected to the sealing tube, and the bottom of the adjusting rod is rotatably connected to a plugging head.

[0014] Furthermore, an outer sealing ring is provided on the inclined end of the plugging head, and an inner sealing ring is provided on the inner wall of the inclined end of the guide block.

[0015] Furthermore, a connecting pipe for connecting to an external gas extraction pipeline is provided on the top of the sealing pipe, and the connecting pipe is connected to the inner liner.

[0016] The beneficial effects of the present invention compared to the prior art are:

[0017] 1. The present invention provides an extrusion assembly and a locking assembly, so that when the sealing tube is embedded in the extraction borehole, the extrusion assembly drives the locking assembly to move out of the through hole and insert it into the inner wall of the borehole for locking. The sealing position and state of the sealing tube can be locked stably and at multiple points, thereby reducing the continuous reaction effect of high-pressure gas on the sealing tube, ensuring that the sealing tube can be in a static and stable sealing state, and enhancing the effect of gas extraction sealing.

[0018] 2. The present invention provides a sealing assembly, which can be used to fix and lock the sealing tube in position, and then pour sealing slurry into the sealing assembly to cause the sealing assembly to expand and deform, thereby sealing and filling the gap between the sealing tube and the drilled hole, preventing soil and rocks on the inner wall of the drilled hole from entering the gap space between the sealing tube and the drilled hole and causing the drilled hole to become loose, and also improving the sealing performance of the connection between the drilled hole and the sealing tube.

[0019] 3. The present invention provides a guide block with an arc-shaped bottom and an inclined top, so that the inclined structure can provide a linear contact surface for contact and locking with the locking assembly, thereby achieving an efficient and tight sealing effect for the inner liner. At the same time, the arc-shaped structure can also guide the gas, reduce the impact of high-pressure gas on the guide block, and ensure that the high-pressure gas can be effectively blocked and controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a coal mine gas extraction and sealing device provided in an embodiment;

[0021] Figure 2 A schematic diagram of the partial structure of the connection between the sealing tube, the extrusion assembly and the locking assembly provided in the embodiment;

[0022] Figure 3 A schematic structural diagram of a locking block provided in an embodiment;

[0023] Figure 4 A schematic diagram of the partial structure of the connection between the sealing tube, the inner liner and the plugging assembly provided in the embodiment;

[0024] Figure 5 A schematic structural diagram of a sealing assembly provided in an embodiment.

[0025] Description of reference numerals:

[0026] 1. Sealing tube; 2. Active cavity;

[0027] 3. Extrusion assembly; 31. Rotating rod; 32. Transmission rod; 33. Extrusion block;

[0028] 4. Locking assembly; 41. Locking block; 411. Force-bearing portion; 412. Locking portion; 42. Limiting plate; 43. Spring;

[0029] 5. Through hole; 6. Inner liner;

[0030] 7. Guide block; 71. Inner sealing ring;

[0031] 8. Sealing assembly; 81. Adjusting rod; 82. Sealing head; 83. External sealing ring;

[0032] 9. Connecting pipe;

[0033] 10. Sealing assembly; 101. Pouring head; 102. Pouring tube; 103. Partition; 104. Expansion bag. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0035] like Figure 1-Figure 5 As shown, this embodiment provides a coal mine gas extraction sealing device, including a sealing tube 1: the outer wall of the sealing tube 1 is provided with a through hole 5, the inner wall of the sealing tube 1 is movably connected with a locking component 4, and the through hole 5 has a locking position and a pick-up position; the locking component 4 can be moved out of the locking position of the through hole 5 and contact the inner wall of the drill hole during its stroke, and can also be moved into the pick-up position in the through hole 5 and separated from the inner wall of the drill hole; the sealing tube 1 is movably connected with an extrusion component 3 that drives the locking component 4 to move from the pick-up position to the locking position. When the extrusion component 3 is not in contact with the locking component 4 When touched, the locking component 4 is in the pick-and-place position moved into the through hole 5, so that the sealing tube 1 can be conveniently embedded in the inner wall of the gas extraction borehole. When the sealing tube 1 is embedded in the inner wall of the gas extraction borehole, the extrusion component 3 is driven to make it contact with the locking component 4, and the locking component 4 is driven from the pick-and-place position to the locking position, so that the sealing tube 1 and the inner wall of the gas extraction borehole can be stably and multi-point locked and fixed, thereby enhancing the position stability of the sealing tube 1 and avoiding the phenomenon of shaking or insufficient sealing of the sealing tube 1 after high-pressure gas exerts pressure on the sealing tube 1 for a long time.

[0036] The inner wall of the sealing tube 1 is provided with an inner liner 6, and the inner wall of the inner liner 6 is provided with a guide block 7. The bottom of the guide block 7 is an arc-shaped structure, which is used to guide the gas, and the top is an inclined structure. The sealing tube 1 and the inner liner 6 are combined to form an active cavity 2, so that the active cavity 2 can form a closed space in the sealing tube 1, providing sufficient operating space for the locking assembly 4 and the extrusion assembly 3, so that the extrusion assembly 3 and the locking assembly 4 can be flexibly and freely operated and adjusted.

[0037] A connecting pipe 9 is provided at the top of the sealing pipe 1. The connecting pipe 9 is used to connect to an external gas extraction pipeline, so that the gas in the borehole can be extracted and collected outward through the connecting pipe 9. A sealing component 8 that contacts or separates from the guide block 7 is movably connected to the sealing pipe 1. By adjusting the sealing component 8 to contact or separate from the guide block 7, the opening and closing state of the gas extraction channel in the sealing pipe 1 can be controlled, thereby controlling the gas extraction.

[0038] The locking assembly 4 includes a locking block 41, a limiting plate 42 is provided on the locking block 41, and the limiting plate 42 is elastically connected to the inner wall of the sealing tube 1 through a spring 43, and the extrusion assembly 3 includes a rotating rod 31 spirally connected to the sealing tube 1, the bottom of the rotating rod 31 is rotatably connected to the transmission rod 32, and the transmission rod 32 is provided with an extrusion block 33 in contact with the locking block 41, and the locking block 41 is composed of a conical locking portion 412 and a wedge-shaped force-bearing portion 411, wherein the inclined edge of the force-bearing portion 411 is adapted to the inclined edge of the extrusion block 33, the number of the locking blocks 41 and the extrusion blocks 33 is the same and both are multiple, and the spacing between adjacent two is large. When the locking block 41 is not in contact with the extrusion block 33, the spring 43 is in a normal state. At this time, the locking block 41 will move into the through hole 5. When the rotating rod 31 is rotated to drive the transmission rod 32 to move linearly downward, the transmission rod 32 will drive the extrusion block 33 to move downward synchronously, and make the extrusion block 33 contact with the locking block 41. At this time, under the contact friction of the inclined surface, the locking portion 412 of the locking block 41 is moved out of the through hole 5 and inserted into the inner wall of the borehole, which can play the role of multi-point reinforcement support for the sealing tube 1 and the inner wall of the borehole, thereby improving the stability of the position of the sealing tube 1 and preventing the sealing tube 1 from shaking under the action of high-pressure gas.

[0039] The sealing assembly 8 includes an adjusting rod 81 that is spirally connected to the sealing tube 1. The bottom of the adjusting rod 81 is rotatably connected to a sealing head 82, and the inclined end of the sealing head 82 is provided with an outer sealing ring 83. The inner wall of the inclined end of the guide block 7 is provided with an inner sealing ring 71. When the adjusting rod 81 is rotated to drive the sealing head 82 to move linearly downward, the sealing head 82 will contact and squeeze the inclined inner wall of the guide block 7, so that the two are in a relatively sealed state. When the two are squeezed against each other, the outer sealing ring 83 and the inner sealing ring 71 will be squeezed and deformed respectively, which can play a double sealing protection role between the sealing head 82 and the guide block 7, avoiding gas leakage. When the adjusting rod 81 is rotated in the opposite direction, the sealing head 82 will be separated from the guide block 7, which can play a conductive role in the inner cavity of the inner liner 6, allowing high-pressure gas to flow.

[0040] It also includes a sealing component 10, which includes a partition 103 arranged on the outer wall of the sealing tube 1, an expansion bag 104 is provided on the inner wall of the partition 103, and a pouring tube 102 extending to the outside of the sealing tube 1 is provided on the expansion bag 104, and a pouring head 101 is provided at the end of the pouring tube 102, and the expansion bag 104 is located between two adjacent locking blocks 41. When the position of the sealing tube 1 is fixed and locked, the sealing slurry is poured into the pouring tube 102 through the pouring head 101, so that the sealing slurry enters the expansion bag 104 and forces the expansion bag 104 to expand and deform, so as to fill and seal the gap between the sealing tube 1 and the inner wall of the borehole, thereby further improving the sealing between the inner wall of the borehole and the outer wall of the sealing tube 1.

[0041] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be considered that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims

1. A coal mine gas extraction sealing device, comprising a sealing pipe (1); characterized in that: The sealing tube (1) is provided with an inner liner (6), which is connected to the borehole for gas extraction; a locking assembly (4) and an extrusion assembly (3) are provided in the cavity between the inner liner (6) and the sealing tube (1); a through hole (5) is provided on the tube wall of the sealing tube (1); the locking assembly (4) is movably connected to the inner wall of the sealing tube (1); the extrusion assembly (3) includes a rotating rod (31) movably connected to the sealing tube (1); the rotating rod (31) is spirally connected to the sealing tube (1), and the bottom of the rotating rod (31) is rotatably connected to a transmission rod (32), and an extrusion block (33) is provided on the transmission rod (32); the extrusion block (33) contacts the locking assembly (4); the rotating rod (31) pushes the extrusion block (33) to make the locking assembly (4) extend from or retract from the through hole (5); The locking assembly (4) comprises a locking block (41), a limiting plate (42) is provided on the locking block (41), and the limiting plate (42) is elastically connected to the inner wall of the sealing tube (1) via a spring (43); It also includes a sealing assembly (10); the sealing assembly (10) includes a partition (103) arranged on the outer wall of the sealing tube (1), an expansion bag (104) is arranged on the inner wall of the partition (103), and a pouring pipe (102) extending to the outside of the sealing tube (1) is arranged on the expansion bag (104), and a pouring head (101) is arranged at the end of the pouring pipe (102); The inner wall of the inner liner (6) is slidably connected to a plugging assembly (8), and the inner wall of the inner liner (6) is provided with a guide block (7); the inner liner (6) is closed and opened by moving the plugging assembly (8) to contact or separate from the guide block (7); the plugging assembly (8) includes an adjusting rod (81) spirally connected to the sealing tube (1), and the bottom of the adjusting rod (81) is rotatably connected to a plugging head (82); the top of the sealing tube (1) is provided with a connecting pipe (9) for connecting to an external gas extraction pipeline, and the connecting pipe (9) is connected to the inner liner (6).

2. A coal mine gas extraction and sealing device according to claim 1, characterized in that: The locking block (41) is composed of a conical locking portion (412) and a wedge-shaped force-bearing portion (411), wherein the inclined edge of the force-bearing portion (411) is adapted to the inclined edge of the extrusion block (33).

3. A coal mine gas extraction and sealing device according to claim 1, characterized in that: An outer sealing ring (83) is provided at the inclined end of the plugging head (82), and an inner sealing ring (71) is provided on the inner wall of the inclined end of the guide block (7).

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