Gas drainage device for air return corner of coal face

Abstract

The invention provides a gas drainage device for an air return corner of a coal face, and relates to the technical field of gas drainage equipment.The gas drainage device comprises a liquid storage tank, an air exhaust assembly and an exhaust fan, and the liquid storage tank is provided with a first containing cavity used for containing a liquid medium; the air exhaust assembly comprises an air exhaust box and an air inlet pipe, the air exhaust box is arranged on the outer side of the liquid storage box and provided with a second containing cavity with an opening, the air inlet pipe communicates with the second containing cavity, and the end, deviating from the second containing cavity, of the air inlet pipe extends into the liquid medium of the first containing cavity; the exhaust fan is arranged on the outer side of the liquid storage tank, an exhaust opening of the exhaust fan is communicated with the first containing cavity so as to extract gas in the first containing cavity, and an exhaust outlet of the exhaust fan is suitable for being communicated with a gas drainage pipe. The coal powder-containing gas in the coal mining area environment can be treated, the problem that the opening of the gas drainage pipe is easily blocked by coal powder is effectively solved, the maintenance cost is reduced, and the gas drainage operation efficiency is favorably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas drainage equipment, and in particular to a gas drainage device for a return air corner of a coal mining face. Background Art

[0002] The return air corner of the coal mining face is close to the coal wall and the goaf. When the airflow passes through the upper end of the working face, the wind speed near the coal wall is reduced due to the sudden vertical turn of the tunnel. At the same time, vortexes will appear in the local area of the return air corner of the working face, causing gas to accumulate in the return air corner and not easily carried away by the airflow.

[0003] In related technologies, gas is usually extracted using a buried pipe extraction process. However, there is a lot of coal powder in the coal mining area. After the gas extraction pipe has been working for a long time, its opening will be blocked by coal powder, affecting the gas extraction effect. This poses a great safety hazard and high subsequent maintenance costs, which is not conducive to gas extraction operations. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a gas extraction device at the return air corner of a coal mining working face. The gas extraction device at the return air corner of the coal mining working face can process the coal powder-containing gas in the coal mining area environment, effectively solving the problem that the opening of the gas extraction pipe is easily blocked by coal powder, reducing maintenance costs, and helping to improve the efficiency of gas extraction operations.

[0006] According to an embodiment of the present invention, a gas extraction device at the return air corner of a coal mining working face includes a liquid storage tank, an exhaust assembly and an exhaust fan, wherein the liquid storage tank has a first accommodating chamber for accommodating a liquid medium; the exhaust assembly includes an exhaust box and an air inlet pipe, the exhaust box is arranged outside the liquid storage tank and has an open second accommodating chamber, the air inlet pipe is connected to the second accommodating chamber, and the end of the air inlet pipe away from the second accommodating chamber extends into the liquid medium in the first accommodating chamber; the exhaust fan is arranged outside the liquid storage tank, the exhaust port of the exhaust fan is connected to the first accommodating chamber to extract the gas in the first accommodating chamber, and the exhaust port of the exhaust fan is suitable for being connected to the gas extraction pipe.

[0007] According to the gas extraction device at the return air corner of the coal mining working face according to the embodiment of the present invention, after the gas extraction device is placed at the return air corner, the opening and closing status of the exhaust fan can be determined according to the gas content in the coal mining area environment. When the exhaust fan is started to extract the gas in the first accommodating chamber, because the first accommodating chamber is a closed space, the coal powder-containing gas in the coal mining area environment will enter the liquid medium in the first accommodating chamber through the second accommodating chamber and the air inlet pipe in sequence under the action of the pressure difference. At this time, the coal powder in the gas will be adsorbed by the liquid medium to obtain gas with higher purity, and the gas with higher purity will rise above the liquid level of the liquid medium, and the exhaust fan can extract the gas with higher purity. High-purity gas is extracted and introduced into the gas extraction pipe, so that the gas with higher purity is introduced into the gas extraction system for storage by the gas extraction pipe, thereby effectively avoiding the problem that the opening of the gas extraction pipe will be blocked by coal powder in the gas after working for a long time, thereby affecting the gas extraction effect, reducing safety hazards, and there is no need to manually clean each gas extraction pipe regularly, which greatly reduces the later maintenance and the time for cleaning coal powder. Therefore, compared with related technologies, the present invention can process coal-containing gas in the coal mining area environment, effectively solves the problem that the opening of the gas extraction pipe is easily blocked by coal powder, reduces maintenance costs, and is conducive to improving the efficiency of gas extraction operations.

[0008] In some embodiments, the gas extraction device further includes a fan blade assembly, which is engaged with the opening of the second accommodating cavity. The fan blade assembly has a first state of opening the opening of the second accommodating cavity and a second state of closing the opening of the second accommodating cavity.

[0009] In some embodiments, the fan blade assembly includes a connecting rod and a blade.

[0010] Wherein, the connecting rod is movably connected to the second accommodating cavity along the up and down directions;

[0011] The blade extends in a first direction, the first direction being orthogonal to the up-down direction, the end of the blade in the first direction being pivotally connected to the air extraction box to form a connection, and the side of the blade facing away from the connection is connected to the connecting rod so that the blade can rotate relative to the opening of the second accommodating cavity;

[0012] There are a plurality of blades arranged in sequence along the up-down direction. In the first state, the plurality of blades are spaced apart in sequence along the up-down direction and are butted or overlapped in sequence along the up-down direction in the second state.

[0013] In some embodiments, the vacuum box is provided with a telescopic portion, at least a portion of the connecting rod is movably connected to the telescopic portion along the up-down direction, and the telescopic portion is capable of pushing and pulling the connecting rod to move relative to the second accommodating cavity along a second direction, wherein the second direction is orthogonal to the up-down direction and the first direction;

[0014] The fan blade assembly further includes a first elastic member, which is sandwiched between the telescopic portion and the connecting rod. The first elastic member can push and pull the connecting rod along the up and down directions to move relative to the second accommodating cavity.

[0015] In some embodiments, the fan blade assembly further includes a baffle and a second elastic member, and the outermost blades in the vertical direction, the baffle and the second elastic member are arranged in sequence along the vertical direction;

[0016] The baffle is rotatably connected to the air pumping box, the second elastic member is connected to the air pumping box, and the end of the second elastic member facing away from the air pumping box is connected to the baffle to press the baffle against the outermost blade.

[0017] In some embodiments, the first accommodating chamber is provided with a partition, the partition dividing the first accommodating chamber into an upper chamber and a lower chamber in the vertical direction, the second end of the air inlet pipe is located in the upper chamber, the lower chamber includes a filter area and a non-filter area that are connected, and the filter area is connected to the upper chamber;

[0018] The gas extraction device further includes a filter assembly, which is disposed in the filter area and is used to filter waste residue in the liquid medium and introduce the filtered liquid medium into the non-filter area.

[0019] In some embodiments, the gas extraction device further includes a drive motor, which is disposed outside the liquid storage tank; the filter assembly includes a rotating shaft, a turbine, and a filter plate.

[0020] Wherein, the rotating shaft is pivotally mounted on the filtering area and is transmission-connected to the driving motor;

[0021] Wherein, the turbine is sleeved on the rotating shaft and is rotatable relative to the filtering area;

[0022] Wherein, the filter plate is arranged in the filter area and is spaced apart from the turbine along the axial direction of the rotating shaft. The filter plate is connected to the non-filter area and has a third accommodating chamber and a first side facing the turbine. The third accommodating chamber is used to accommodate waste residue filtered from the liquid medium. The first side is provided with a waste residue inlet connected to the third accommodating chamber. The rotating shaft passes through the waste residue inlet and is rotatably connected to the filter plate.

[0023] In some embodiments, the filter assembly further comprises a vortex disk, which is sleeved on the rotating shaft and fitted in the filter area. The vortex disk is fitted with the first side surface and can collect waste residue adhering to the first side surface to the waste residue inlet.

[0024] In some embodiments, the filter assembly further includes a waste pipe and a delivery shaft.

[0025] The waste discharge pipe is connected to the filter plate and communicates with the third accommodating chamber, and the end of the waste discharge pipe facing away from the filter plate extends to the outside of the liquid storage tank;

[0026] The delivery shaft is pivotally connected to the inner cavity of the waste pipe, the axial direction of the delivery shaft is consistent with the axial direction of the waste pipe, and at least a portion of the delivery shaft extends to the outside of the liquid storage tank.

[0027] In some embodiments, the gas extraction device further includes a housing and a fan.

[0028] The shell is arranged outside the liquid storage tank and below the air extraction box, the shell has a fourth accommodating chamber and is provided with an air inlet and an air outlet communicating with the fourth accommodating chamber, the liquid storage tank is provided with a liquid outlet communicating with the non-filtering area, and the fourth accommodating chamber is communicated with the liquid outlet;

[0029] Wherein, the fan is pivotally mounted in the fourth accommodating chamber.

[0030] In some embodiments, the gas extraction device further includes a liquid inlet regulating component, which is disposed at the liquid outlet to control the amount of liquid medium injected into the fourth accommodating chamber.

[0031] In some embodiments, the liquid inlet regulating assembly includes a water inlet cylinder, a piston rod, an elastic threaded bone and a third elastic member.

[0032] Wherein, the water inlet cylinder is arranged in the non-filtering area and blocks the liquid outlet, and the water inlet cylinder is provided with a through hole communicating with the non-filtering area;

[0033] Wherein, the piston rod passes through the water inlet cylinder and the liquid outlet, and the piston rod is movably connected to the water inlet cylinder and the liquid outlet along the up and down direction;

[0034] Wherein, the elastic threaded bone sleeve is sleeved on the piston rod and located in the inner cavity of the water inlet cylinder. The bottom of the elastic threaded bone is connected to the liquid storage tank, the top of the elastic threaded bone is connected to the outer peripheral surface of the piston rod, and a water passage is defined between the outer peripheral surface of the elastic threaded bone and the inner peripheral surface of the water inlet cylinder. The water passage is communicated with the inner cavity of the water inlet cylinder and the liquid outlet, and the third elastic member is clamped between the inner top surface of the water inlet cylinder and the top of the elastic threaded bone.

[0035] In some embodiments, the drive motor is in transmission connection with the fan. An auxiliary plate is provided at the bottom of the piston rod, and the liquid inlet regulation assembly further includes a collar and a telescopic member.

[0036] Wherein, the collar is sleeved on the motor shaft of the drive motor, and the auxiliary plate and the collar are arranged at intervals in the radial direction of the motor shaft of the drive motor;

[0037] Wherein, the installation end of the telescopic member is connected to the collar, the telescopic end of the telescopic member is provided with a pressing plate, the telescopic member pushes and pulls the pressing plate in the radial direction of the motor shaft of the drive motor, the pressing plate can abut against the bottom of the auxiliary plate, there are a plurality of telescopic members arranged at intervals in the circumferential direction of the collar, and there are a plurality of pressing plates corresponding to the telescopic members one by one.

[0038] In some embodiments, the liquid inlet regulation assembly further includes a fourth elastic member. The first end of the fourth elastic member is connected to the installation end of the telescopic member, the second end of the fourth elastic member is connected to the pressing plate, and there are a plurality of fourth elastic members corresponding to the pressing plates and the telescopic members one by one.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of the first perspective of the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention.

[0041] Figure 2 is a schematic structural diagram of the second perspective of the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention.

[0042] Figure 3 is a schematic cross-sectional structural diagram of the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention.

[0043] Figure 4 is a schematic partial structural diagram of the first position of the impeller assembly of the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention.

[0044] Figure 5 It is a partial structural schematic diagram at the second position of the wind blade assembly in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention.

[0045] Figure 6 It is a connection structural schematic diagram of the air extraction box, blades, baffle plate and the second elastic member in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention.

[0046] Figure 7 It is a connection structural schematic diagram of the liquid storage tank, filtration assembly, drive motor, housing, fan and liquid inlet regulation assembly in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention (the liquid storage tank and the housing are sectioned in the figure).

[0047] Figure 8 It is a connection structural schematic diagram of the liquid storage tank, filtration assembly, drive motor and liquid inlet regulation assembly in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention (the filtration assembly and the liquid inlet regulation assembly are sectioned in the figure).

[0048] Figure 9 It is a connection structural schematic diagram of the liquid storage tank, filtration assembly and liquid inlet regulation assembly in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention (the filtration assembly and the liquid inlet regulation assembly are sectioned in the figure).

[0049] Figure 10 It is a connection structural schematic diagram of the liquid storage tank, filter plate, spiral disk, waste discharge pipe, conveying shaft and liquid inlet regulation assembly in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention (the liquid storage tank, filter plate and liquid inlet regulation assembly are sectioned in the figure).

[0050] Figure 11 It is an exploded structural schematic diagram of the waste discharge pipe, conveying shaft and threaded cap in the gas drainage device at the return air corner of the coal mining face according to an embodiment of the present invention (the waste discharge pipe and the conveying shaft are sectioned in the figure).

[0051] Reference numerals:

[0052] 1. Liquid storage tank; 11. First accommodation cavity; 111. Partition board; 112. Upper chamber; 113. Lower chamber; 1131. Filtration area; 1132. Non-filtration area; 12. Liquid level scale line; 13. Liquid injection port; 14. Liquid outlet; 15. Liquid outlet pipe;

[0053] 2. Air extraction assembly; 21. Air extraction box; 211. Second accommodation cavity, 212. Telescopic part; 22. Intake pipe;

[0054] 3. Exhaust fan; 31. Exhaust fan outlet; 32. Exhaust fan outlet;

[0055] 4. Fan blade assembly; 41. Connecting rod; 411. First rod; 412. Second rod; 42. Blade; 421. Connection; 43. First elastic member; 44. Baffle; 45. Second elastic member;

[0056] 5. Filter assembly; 51. Rotating shaft; 52. Turbine; 53. Filter plate; 531. Third accommodating chamber; 532. First side; 533. Waste residue inlet; 54. Filter housing; 55. Vortex disk; 56. Waste discharge pipe; 57. Delivery shaft; 571. Threaded delivery rod; 58. Threaded cover;

[0057] 6. Drive motor;

[0058] 7. Housing; 71. Fourth accommodating chamber; 72. Air inlet; 73. Air outlet;

[0059] 8. Fan;

[0060] 9. Liquid inlet control assembly; 91. Water inlet cylinder; 911. Through port; 92. Piston rod; 921. Auxiliary plate; 93. Elastic threaded bone; 94. Third elastic member; 95. Ring; 96. Telescopic member; 961. Pressing plate; 97. Fourth elastic member. DETAILED DESCRIPTION

[0061] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0062] like Figures 1 to 3 As shown, a gas extraction device for the return air corner of a coal mining face according to an embodiment of the present invention comprises a liquid storage tank 1, an exhaust assembly 2 and an exhaust fan 3. The liquid storage tank 1 has a first accommodating chamber 11 for accommodating a liquid medium; the exhaust assembly 2 comprises an exhaust box 21 and an air inlet pipe 22. The exhaust box 21 is arranged outside the liquid storage tank 1 and has an open second accommodating chamber 211. The air inlet pipe 22 is connected to the second accommodating chamber 211. The end of the air inlet pipe 22 away from the second accommodating chamber 211 extends into the liquid medium in the first accommodating chamber 11; the exhaust fan 3 is arranged outside the liquid storage tank 1, and the exhaust port 31 of the exhaust fan is connected to the first accommodating chamber 11 to extract the gas in the first accommodating chamber 11. The exhaust port 32 of the exhaust fan is suitable for being connected to the gas extraction pipe.

[0063] According to the gas drainage device at the return air corner of the coal mining face in the embodiment of the present invention, after the gas drainage device is placed at the return air corner, the opening and closing condition of the exhaust fan 3 can be determined according to the gas content in the coal mining area environment. When the exhaust fan 3 is started to extract the gas in the first accommodating cavity 11, since the first accommodating cavity 11 is a closed space, the pulverized coal-containing gas in the coal mining area environment will, under the action of the pressure difference, sequentially enter the liquid medium in the first accommodating cavity 11 through the second accommodating cavity 211 and the air inlet pipe 22. At this time, the pulverized coal in the gas will be adsorbed by the liquid medium to obtain a gas with a higher purity. The gas with a higher purity will rise above the liquid level of the liquid medium, and the exhaust fan 3 can extract the gas with a higher purity and introduce it into the gas drainage pipe, so that the gas drainage pipe can introduce the gas with a higher purity into the gas extraction system for storage. Thus, it effectively avoids the problem that the opening of the gas drainage pipe will be blocked by the pulverized coal in the gas after long-term operation, which affects the gas drainage effect, reduces the safety hazard, and there is no need to manually clean each gas drainage pipe regularly, greatly reducing the later maintenance and the cleaning time of the pulverized coal. Therefore, compared with the related technology, the present invention can process the pulverized coal-containing gas in the coal mining area environment, effectively solve the problem that the opening of the gas drainage pipe is easily blocked by the pulverized coal, reduce the maintenance cost, and is beneficial to improving the gas drainage operation efficiency.

[0064] Specifically, the liquid medium is not limited to water. The liquid storage tank 1 also has a liquid level scale line 12 and is provided with a liquid injection port 13. The liquid injection port 13 can be located at the top of the liquid storage tank 1. The liquid medium can be injected into the first accommodating cavity 11 through the liquid injection port 13, and the liquid level condition of the liquid medium in the first accommodating cavity 11 can be observed in real time through the liquid level scale line 12 to ensure that the injection amount of the liquid medium meets the use requirements. The gas drainage device may further include a knob cover, which is detachably connected to the liquid injection port 13 to facilitate opening or blocking the liquid injection port 13 by screwing the knob cover. The air extraction box 21 and the exhaust fan 3 can be respectively arranged on both sides of the liquid storage tank 1. The part of the air inlet pipe 22 located in the second accommodating cavity 211 can extend in the vertical direction, and this part is provided with an air inlet slot extending in the vertical direction, which increases the air inlet efficiency of the gas. At the same time, compared with the smaller hole-shaped air inlet structure, the air inlet slot structure can also prevent the pulverized coal-containing gas from blocking the air inlet slot. The end of the air inlet pipe 22 facing away from the second accommodating cavity 211 is located below the liquid level of the liquid medium to ensure that the pulverized coal-containing gas is in full contact with the liquid medium, so that the liquid medium can adsorb the pulverized coal. The air extraction port can be communicated with the first accommodating cavity 11 through an air extraction pipe, and the end of the air extraction pipe facing away from the air extraction port is located above the liquid level of the liquid medium.

[0065] For example, a vertical groove communicating with the first accommodating cavity 11 can be opened on the side wall surface of the liquid storage tank 1, and the vertical groove is blocked by a transparent sheet (such as a plastic sheet), and the liquid level scale line 12 is provided on the transparent sheet.

[0066] Furthermore, the gas extraction device may also include a base, and the liquid storage tank 1 may be installed on the base to facilitate the transportation and transfer of the gas extraction device and its stable placement in the return air corner.

[0067] It should be noted that when the gas content in the coal mining area environment exceeds the standard, the exhaust fan 3 is started to work, and after the gas content in the coal mining area environment decreases, the exhaust fan 3 can be turned off.

[0068] In addition, since there is a lot of coal powder in the coal mining area and it floats in the air, the opening of the extraction pipe will be blocked by coal powder after working for a long time, which makes it impossible to completely extract the gas, and forms a gas-enriched area and an extraction blind spot. This will lead to great safety hazards in the future. Each gas extraction pipe needs to be manually cleaned and maintained, which prolongs the maintenance time, increases the labor intensity, and is not conducive to gas extraction operations.

[0069] like Figure 3 As shown, in some embodiments, the gas extraction device further includes a fan blade assembly 4, which is fitted into the opening of the second accommodating cavity 211, and the fan blade assembly 4 has a first state of opening the opening of the second accommodating cavity 211 and a second state of closing the opening of the second accommodating cavity 211.

[0070] It can be understood that the opening and closing of the opening of the second accommodating chamber 211 can be controlled by the fan blade assembly 4, so that when the fan blade assembly 4 opens the opening of the second accommodating chamber 211, the coal powder-containing gas can enter the second accommodating chamber 211, and when the fan blade assembly 4 closes the opening of the second accommodating chamber 211, the second accommodating chamber 211 is isolated from the external environment.

[0071] like Figures 3 to 6 As shown, in some embodiments, the fan blade assembly 4 includes a connecting rod 41 and a blade 42 .

[0072] The connecting rod 41 is movably connected to the second accommodating cavity 211 along the up-down direction.

[0073] Among them, the blade 42 extends along a first direction, which is orthogonal to the up and down directions. The blade 42 is pivotally connected to the vacuum box 21 at the end in the first direction and forms a connection 421. The side of the blade 42 facing away from the connection 421 is connected to the connecting rod 41 so that the blade 42 can rotate relative to the opening of the second accommodating chamber 211.

[0074] There are multiple blades 42 and they are arranged sequentially in the up-down direction. The multiple blades 42 are sequentially spaced apart in the up-down direction in the first state and are sequentially butted or overlapped in the up-down direction in the second state.

[0075] It can be understood that when the connecting rod 41 moves in the up and down direction, a plurality of blades 42 can be pulled to rotate relative to the opening of the second accommodating cavity 211 simultaneously, so as to realize the rapid opening and closing of the opening of the second accommodating cavity 211 by the blades 42.

[0076] Specifically, the connecting rod 41 extends in the up and down direction. There may be two connecting rods 41, which are respectively arranged at both ends of the blade 42 in the first direction, so as to further enable the blade 42 to rotate smoothly relative to the opening of the second accommodating cavity 211. The first direction may be the width direction of the air extraction box 21. The direction of the line of the pivot shaft 51 of the blade 42 is the first direction. A plurality of blades 42 are arranged at equal intervals in the up and down direction.

[0077] As Figure 5 shown, in some embodiments, the air extraction box 21 is provided with a telescopic part 212, at least part of the connecting rod 41 is movably connected to the telescopic part 212 in the up and down direction, and the telescopic part 212 can push and pull the connecting rod 41 to move relative to the second accommodating cavity 211 in the second direction, and the second direction is orthogonal to the up and down direction and the first direction.

[0078] The wind blade assembly 4 further includes a first elastic member 43. The first elastic member 43 is clamped between the telescopic part 212 and the connecting rod 41, and the first elastic member 43 can push and pull the connecting rod 41 to move relative to the second accommodating cavity 211 in the up and down direction.

[0079] It can be understood that when the gas content in the coal mining area environment exceeds the standard and the exhaust fan 3 is started to work, the blades 42 will be driven by the airflow to rotate and be in an open state. At this time, the connecting rod 41 descends under the action of the airflow and drives the blades 42 to move, and the first elastic member 43 is compressed. When the gas content in the coal mining area environment decreases and the exhaust fan 3 is turned off, the elastic action of the first elastic member 43 can push the connecting rod 41 to rise, so that all the blades 42 are butted or overlapped (or said to be fitted) in sequence to close the opening of the second accommodating cavity 211. Therefore, the foregoing structures cooperate to realize the automatic control of the opening and closing conditions of the wind blade assembly 4, and the overall structure is simple and the cost is low.

[0080] Specifically, the connecting rod 41 may include a connected first rod body 411 and a second rod body 412. The first rod body 411 and the second rod body 412 are arranged at intervals in the first direction. One side of the blade 42 facing away from the connection part 421 is connected to the first rod body 411. The telescopic part 212 may be a telescopic rod structure. The installation end of the telescopic rod may be connected to the inner peripheral surface of the second accommodation cavity 211. The second rod body 412 is slidably connected to the telescopic end of the telescopic rod in the up and down direction. For example, a jack is provided at the telescopic end of the telescopic rod, and at least part of the second rod body 412 is slidably fitted in the jack in the up and down direction. The second direction may be the thickness direction of the air extraction box 21. The first elastic member 43 may not be limited to a columnar spring. The bottom end of the first elastic member 43 may be connected to the top of the telescopic end of the telescopic rod, and the top end of the first elastic member 43 may be connected to the outer peripheral surface of the second rod body 412.

[0081] As Figure 6 shown, in some embodiments, the wind blade assembly 4 further includes a baffle 44 and a second elastic member 45. Among the plurality of blades 42, the outermost blade 42 in the up and down direction, the baffle 44, and the second elastic member 45 are arranged in sequence in the up and down direction.

[0082] The baffle 44 is rotatably connected to the air extraction box 21. The second elastic member 45 is connected to the air extraction box 21. The end of the second elastic member 45 facing away from the air extraction box 21 is connected to the baffle 44 to press the baffle 44 against the outermost blade 42.

[0083] It can be understood that the second elastic member 45 can reliably press the baffle 44 against the bottom of the outermost blade 42 by means of elastic force, so as to cooperate with all the blades 42 after the exhaust fan 3 is turned off, achieve a good seal of the opening of the second accommodation cavity 211, and isolate the second accommodation cavity 211 from the external environment.

[0084] Specifically, both the baffle 44 and the second elastic member 45 may extend in the first direction. The baffle 44 and the second elastic member 45 may be sequentially located below the outermost blade 42. In other words, the baffle 44 is located below the bottom blade 42, and the second elastic member 45 is located below the baffle 44. The bottom end of the baffle 44 may be hinged to the air extraction box 21. The top end of the second elastic member 45 may be hinged to the wall surface of the baffle 44 facing away from the outermost blade 42, and the bottom end of the second elastic member 45 may be fixedly connected to the air extraction box 21. The second elastic member 45 may not be limited to a spring sheet.

[0085] As Figures 7 to 10 shown, in some embodiments, the first accommodation cavity 11 is provided with a partition 111. The partition 111 divides the first accommodation cavity 11 into an upper chamber 112 and a lower chamber 113 in the up and down direction. The second end of the air inlet pipe 22 is located in the upper chamber 112. The lower chamber 113 includes a connected filtration area 1131 and a non-filtration area 1132. The filtration area 1131 is communicated with the upper chamber 112.

[0086] The gas drainage device further includes a filtering component 5, which is arranged in the filtering area 1131 and is used for filtering the waste residue in the liquid medium and guiding the filtered liquid medium into the non-filtering area 1132.

[0087] It can be understood that by integrating the filtering component 5 in the first accommodating cavity 11, the purification treatment of the liquid medium adsorbed with coal powder and other impurities can be realized, and the service performance of the gas drainage device can be further improved.

[0088] Specifically, the liquid medium is located in the upper chamber 112. The waste residue may include coal powder and other impurities.

[0089] Such as Figures 7 to 10 As shown, in some embodiments, the gas drainage device further includes a driving motor 6, which is arranged outside the liquid storage tank 1; the filtering component 5 includes a rotating shaft 51, a turbine 52 and a filter plate 53.

[0090] Wherein, the rotating shaft 51 is pivotally installed in the filtering area 1131 and is in transmission connection with the driving motor 6.

[0091] Wherein, the turbine 52 is sleeved on the rotating shaft 51 and is rotatable relative to the filtering area 1131.

[0092] Wherein, the filter plate 53 is arranged in the filtering area 1131 and is arranged at an axial interval along the rotating shaft 51 with the turbine 52. The filter plate 53 is communicated with the non-filtering area 1132 and has a third accommodating cavity 531 and a first side surface 532 facing the turbine 52. The third accommodating cavity 531 is used for accommodating the waste residue filtered from the liquid medium. The first side surface 532 is provided with a waste residue inlet 533 communicating with the third accommodating cavity 531, and the rotating shaft 51 passes through the waste residue inlet 533 and is rotatably connected with the filter plate 53.

[0093] It can be understood that the driving motor 6 can drive the rotating shaft 51 to rotate, so that the rotating shaft 51 can drive the turbine 52 to rotate. At this time, the coal powder-containing liquid medium in the filtering area 1131 is driven by the turbine 52 and impacts the filter plate 53, so that the coal powder and impurities attached to the liquid medium are filtered by the filter plate 53. The coal powder and impurities will adhere to the first side surface 532 and can be collected into the third accommodating cavity 531 through the waste residue inlet 533.

[0094] Specifically, the drive motor 6 can be arranged at the bottom of the liquid storage tank 1 and on the base to improve the integration of the gas drainage device and reduce the overall structural volume. The turbine 52 can be located in the middle of the rotating shaft 51 and adjacent to the notch communicating with the upper chamber 112. The waste residue inlet 533 can be located at the center of the first side surface 532. The filter assembly 5 can further include a filter housing 54. The filter housing 54 is fixed to the lower chamber 113 and divides the lower chamber 113 into a filtering area 1131 and a non-filtering area 1132. Among them, the inner cavity of the filter housing 54 is the filtering area 1131. The filter assembly 5 is arranged in the inner cavity of the filter housing 54. The filter housing 54 is provided with a notch communicating with the upper chamber 112 and a notch communicating with the non-filtering area 1132, so that the liquid medium adsorbed with pulverized coal in the upper chamber 112 can enter the filtering area 1131 through the notch communicating with the upper chamber 112 for filtering treatment, and the filtered liquid medium enters the non-filtering area 1132 through the notch communicating with the non-filtering area 1132 for temporary storage.

[0095] As Figure 9 and Figure 10 shown, in some embodiments, the filter assembly 5 further includes a vortex disk 55. The vortex disk 55 is sleeved on the rotating shaft 51 and is fitted in the filtering area 1131. The vortex disk 55 is attached to the first side surface 532. The vortex disk 55 can scrape and collect the waste residue adhering to the first side surface 532 to the waste residue inlet 533.

[0096] It can be understood that the rotating shaft 51 can drive the vortex disk 55 to rotate, so as to scrape and collect the pulverized coal and impurities on the first side surface 532 to the waste residue inlet 533 through the rotating vortex disk 55, extend the water change interval time of the gas drainage device, reduce the subsequent manual maintenance time, and improve the gas drainage efficiency.

[0097] As Figure 10 and Figure 11 shown, in some embodiments, the filter assembly 5 further includes a waste discharge pipe 56 and a conveying shaft 57.

[0098] Among them, the waste discharge pipe 56 is connected to the filter plate 53 and communicates with the third accommodation cavity 531. The end of the waste discharge pipe 56 facing away from the filter plate 53 extends to the outside of the liquid storage tank 1.

[0099] Among them, the conveying shaft 57 is pivotally connected to the inner cavity of the waste discharge pipe 56. The axial direction of the conveying shaft 57 is the same as the axial direction of the waste discharge pipe 56. At least part of the conveying shaft 57 extends to the outside of the liquid storage tank 1.

[0100] It can be understood that by rotating the conveying shaft 57, the waste residue (i.e., pulverized coal and other impurities) can be discharged from the waste discharge pipe 56 to the outside of the liquid storage tank 1, further simplifying the treatment method of the waste residue. The waste residue cleaning operation is convenient and fast, which is beneficial to extending the service life of the filter plate 53 and reducing the maintenance cost.

[0101] Specifically, the outer circumference of the conveying shaft 57 is provided with a threaded conveying bone 571 along its axial direction, so that the threaded conveying bone 571 can rotate and move the waste residue to the outside of the liquid storage tank 1. The filter assembly 5 may also include a threaded cover 58, which can be mounted on the end of the conveying shaft 57 away from the filter plate 53, and at least the outer circumference of the threaded cover 58 can be threadedly connected to the inner circumference of the exhaust pipe 56, so that the exhaust pipe 56 is blocked by the threaded cover 58 to ensure smooth completion of the filtration treatment of the liquid medium containing coal powder. Alternatively, the exhaust pipe 56 can be opened by the threaded cover 58 to facilitate manual rotation of the conveying shaft 57 to transport the waste residue in the exhaust pipe 56 out of the outside of the liquid storage tank 1.

[0102] like Figures 1 to 7 As shown, in some embodiments, the gas extraction device further includes a housing 7 and a fan 8.

[0103] Among them, the shell 7 is arranged on the outside of the liquid storage tank 1 and is located below the vacuum box 21. The shell 7 has a fourth accommodating chamber 71 and is provided with an air inlet 72 and an air outlet 73 connected to the fourth accommodating chamber 71. The liquid storage tank 1 is provided with a liquid outlet 14 connected to the non-filtering area 1132, and the fourth accommodating chamber 71 is connected to the liquid outlet 14.

[0104] The fan 8 is pivotally mounted in the fourth accommodating chamber 71 .

[0105] It can be understood that the shell 7 and the fan 8 cooperate to form an exhaust assembly, so that the filtered liquid medium enters the fourth accommodating chamber 71 through the liquid outlet 14, and is dispersed and discharged into the external environment under the action of the fan 8. Since the exhaust assembly is located below the exhaust assembly 2, the wind force generated by the fan 8 will accelerate the flow of gas, which is conducive to the mixing of the dispersed liquid medium and the gas, and increase the mixing density of the two, so that most of the gas can be located above the exhaust assembly, that is, directly in front of the exhaust assembly 2, thereby further accelerating the exhaust fan 3 to extract the gas.

[0106] Specifically, the housing 7 can be fixedly mounted on the top of the base. The housing 7 is provided with a water inlet, which is communicated with the liquid outlet 14 via a liquid outlet pipe 15.

[0107] It should be noted that the density of gas is lower than that of air, and gas will always be mixed in the air. When the fan 8 rotates, the wind force it generates will accelerate the flow of air, while extracting the filtered liquid medium and dispersing it in the air.

[0108] like Figure 3As shown, in some embodiments, the gas drainage device further includes a liquid inlet regulation assembly 9. The liquid inlet regulation assembly 9 is arranged at the liquid outlet 14 to control the injection amount of the liquid medium into the fourth accommodation cavity 71, so as to reasonably control the injection amount of the liquid medium and the rotation speed of the fan 8 according to the gas concentration in the coal mining area environment, effectively avoiding the problem that excessive injection of the liquid medium causes the fan 8 to be unable to blow out the liquid medium in time, the liquid medium accumulates at the bottom of the housing 7, affecting the rotation of the fan 8, and causing energy waste.

[0109] As Figures 3 to 10 shown, in some embodiments, the liquid inlet regulation assembly 9 includes a water inlet cylinder 91, a piston rod 92, an elastic threaded bone 93 and a third elastic member 94.

[0110] Among them, the water inlet cylinder 91 is arranged in the non-filtering area 1132 and blocks the liquid outlet 14. The water inlet cylinder 91 is provided with a through hole 911 communicating with the non-filtering area 1132.

[0111] Among them, the piston rod 92 passes through the water inlet cylinder 91 and the liquid outlet 14, and the piston rod 92 is movably connected to the water inlet cylinder 91 and the liquid outlet 14 in the vertical direction;

[0112] Among them, the elastic threaded bone 93 is sleeved on the piston rod 92 and located in the inner cavity of the water inlet cylinder 91. The bottom of the elastic threaded bone 93 is connected to the liquid storage tank 1, the top of the elastic threaded bone 93 is connected to the outer peripheral surface of the piston rod 92, and a water passage is defined between the outer peripheral surface of the elastic threaded bone 93 and the inner peripheral surface of the water inlet cylinder 91. The water passage extends in the vertical direction and is communicated with the inner cavity of the water inlet cylinder 91 and the liquid outlet 14. The third elastic member 94 is clamped between the inner top surface of the water inlet cylinder 91 and the top of the elastic threaded bone 93 to facilitate pushing and pulling the elastic threaded bone 93 by the third elastic member 94.

[0113] It can be understood that the filtered liquid medium temporarily stored in the non-filtering area 1132 will enter the inner cavity of the water inlet cylinder 91 through the through hole 911, and then enter the fourth accommodation cavity 71 through the water passage and the liquid outlet 14. During this process, due to the blocking effect of the elastic threaded bone 93, the filtered liquid medium will slowly flow into the fourth accommodation cavity 71 to avoid excessive flow rate, the fan 8 being unable to blow out the liquid medium in time, which easily causes the problem of energy waste caused by the accumulation of the liquid medium at the bottom of the housing 7. In addition, by the sliding of the piston rod 92 in the water inlet cylinder 91 and the liquid outlet 14 in the vertical direction, the elastic threaded bone 93 can be pulled to expand and contract, so as to change the distance between the threaded gaps of the elastic threaded bone 93, thereby adjusting the size of the water passage and realizing the control of the outflow speed of the filtered liquid medium from the liquid outlet 14.

[0114] Specifically, the water inlet cylinder 91 can be covered on the liquid outlet 14 and connected to the inner bottom surface of the liquid storage tank 1. The through-hole 911 can be located on the side wall of the water inlet cylinder 91. There are at least two through-holes 911 and they are spaced apart along the circumference of the water inlet cylinder 91. The axial direction of the piston rod 92 can be consistent with the up-down direction. The lower end of the piston rod 92 can pass through the liquid outlet pipe 15 and be slidably connected to the liquid outlet pipe 15 along the up-down direction. The elastic threaded bone 93 can be coaxially sleeved on the piston rod 92. The elastic threaded bone 93 and the third elastic member 94 can both be telescopic in the up-down direction. The elastic threaded bone 93 is not limited to a rubber threaded bone. The third elastic member 94 is not limited to a columnar spring. The bottom of the third elastic member 94 can be connected to the top of the elastic threaded bone 93, and the top of the third elastic member 94 can be connected to the inner top surface of the water inlet cylinder 91; or, the bottom of the third elastic member 94 can be connected to the top of the elastic threaded bone 93, and the top of the third elastic member 94 can abut against the inner top surface of the water inlet cylinder 91; or, the bottom of the third elastic member 94 can abut against the top of the elastic threaded bone 93, and the top of the third elastic member 94 can be connected to the inner top surface of the water inlet cylinder 91.

[0115] like Figures 3 to 8 As shown, in some embodiments, the drive motor 6 is transmission-connected to the fan 8 , an auxiliary plate 921 is provided at the bottom of the piston rod 92 , and the liquid inlet regulating assembly 9 further includes a collar 95 and a telescopic member 96 .

[0116] The collar 95 is sleeved on the motor shaft of the driving motor 6 , and the auxiliary plate 921 and the collar 95 are spaced apart along the radial direction of the motor shaft of the driving motor 6 .

[0117] Among them, the mounting end of the telescopic member 96 is connected to the ring 95, and the telescopic end of the telescopic member 96 is provided with a pressure plate 961. The telescopic member 96 pushes and pulls the pressure plate 961 along the radial direction of the motor shaft of the drive motor 6. The pressure plate 961 can abut against the bottom of the auxiliary plate 921. There are multiple telescopic members 96 and they are arranged at intervals along the circumference of the ring 95. There are multiple pressure plates 961 and they correspond one to one with the telescopic members 96. Multiple pressure plates 961 can act on the auxiliary plate 921 in turn, so that the auxiliary plate 921 can move intermittently, further controlling the amount of filtered liquid medium injected into the fourth accommodating chamber 71.

[0118] It can be understood that the driving motor 6 drives the rotating shaft 51 and the fan 8 to rotate simultaneously, which further simplifies the overall structure of the gas drainage device and can reduce costs. During the rotation of the motor shaft of the driving motor 6, a centrifugal force will be generated on the pressing plate 961. The pressing plate 961 gradually moves away from the collar 95 along the radial direction of the motor shaft of the driving motor 6. When the pressing plate 961 abuts against the bottom of the auxiliary plate 921, a thrust will be generated on the auxiliary plate 921. Since the auxiliary plate 921 is connected to the piston rod 92, the piston rod 92 will be pushed upward. The piston rod 92 drives the elastic threaded bone 93 to stretch, and the distance between the threaded gaps of the elastic threaded bone 93 increases, so as to facilitate the rapid passage of water through the water passage and enter the fourth accommodation cavity 71 via the water inlet cylinder 91, improving the working efficiency of the exhaust component while ensuring no waste of energy.

[0119] Specifically, the auxiliary plate 921 can be an arc-shaped plate. The pressing plate 961 can be an arc-shaped plate to increase the contact area between the pressing plate 961 and the auxiliary plate 921 and improve the driving force exerted by the pressing plate 961 on the auxiliary plate 921. The installation end of the telescopic member 96 can be connected to the outer peripheral surface of the collar 95. The telescopic member 96 can be not limited to a telescopic rod.

[0120] As Figure 7 and Figure 8 shown, in some embodiments, the liquid inlet regulation assembly 9 further includes a fourth elastic member 97. The first end of the fourth elastic member 97 is connected to the installation end of the telescopic member 96, and the second end of the fourth elastic member 97 is connected to the pressing plate 961. There are multiple fourth elastic members 97, which correspond to the pressing plate 961 and the telescopic member 9 to assist the telescopic member 96 to automatically expand and contract, further simplifying the structure of the gas drainage device and ensuring the expansion and contraction reliability of the telescopic member 96 at the same time.

[0121] Specifically, the fourth elastic member 97 can be not limited to a columnar spring. Taking the figure as an example, a fourth elastic member 97 can be provided on each side of each telescopic member 96 to further ensure the pushing and pulling reliability of the pressing plate 961.

[0122] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0123] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0124] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0125] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0126] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0127] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas drainage device for the return air corner of a coal mining face, characterized in that, include: A liquid storage tank having a first accommodating chamber for accommodating a liquid medium; an air extraction assembly, the air extraction assembly comprising an air extraction box and an air intake pipe, the air extraction box being disposed outside the liquid storage tank and having an open second accommodating chamber, the air intake pipe being in communication with the second accommodating chamber, the end of the air intake pipe facing away from the second accommodating chamber extending into the liquid medium in the first accommodating chamber; and An exhaust fan is arranged outside the liquid storage tank, an exhaust port of the exhaust fan is connected to the first accommodating chamber to extract the gas in the first accommodating chamber, and an exhaust port of the exhaust fan is suitable for connecting to a gas extraction pipe.

2. The gas drainage device for the return air corner of the coal mining face according to claim 1, wherein It also includes a fan blade assembly, which is fitted into the opening of the second accommodating cavity. The fan blade assembly has a first state of opening the opening of the second accommodating cavity and a second state of closing the opening of the second accommodating cavity.

3. The gas drainage device for the return air corner of the coal mining face according to claim 2, characterized in that, The fan blade assembly includes: a connecting rod movably connected to the second accommodating cavity in an up-down direction; and a blade, the blade extending in a first direction, the first direction being orthogonal to the up-down direction, the end of the blade in the first direction being pivotally connected to the air extraction box to form a connection, and the side of the blade facing away from the connection being connected to the connecting rod so that the blade can rotate relative to the opening of the second accommodating chamber; There are a plurality of blades arranged in sequence along the up-down direction. In the first state, the plurality of blades are spaced apart in sequence along the up-down direction and are butted or overlapped in sequence along the up-down direction in the second state.

4. The gas drainage device for the return air corner of the coal mining face according to claim 3, characterized in that, The vacuum box is provided with a telescopic portion, at least a portion of the connecting rod is movably connected to the telescopic portion along the up-down direction, and the telescopic portion is capable of pushing and pulling the connecting rod to move relative to the second accommodating cavity along a second direction, the second direction being orthogonal to the up-down direction and the first direction; The fan blade assembly further includes a first elastic member, which is sandwiched between the telescopic portion and the connecting rod. The first elastic member can push and pull the connecting rod along the up and down directions to move relative to the second accommodating cavity.

5. The gas drainage device for the return air corner of the coal mining face according to claim 3, characterized in that, The fan blade assembly further includes a baffle and a second elastic member, wherein the outermost blades in the vertical direction, the baffle and the second elastic member are sequentially arranged in the vertical direction; The baffle is rotatably connected to the air pumping box, the second elastic member is connected to the air pumping box, and the end of the second elastic member facing away from the air pumping box is connected to the baffle to press the baffle against the outermost blade.

6. The gas drainage device for the return air corner of the coal mining face according to any one of claims 1-5, characterized in that, The first accommodating chamber is provided with a partition, which divides the first accommodating chamber into an upper chamber and a lower chamber in the vertical direction, the second end of the air inlet pipe is located in the upper chamber, and the lower chamber includes a filter area and a non-filter area that are connected to each other, and the filter area is connected to the upper chamber; The gas extraction device further includes a filter assembly, which is disposed in the filter area and is used to filter waste residue in the liquid medium and introduce the filtered liquid medium into the non-filter area.

7. The gas drainage device for the return air corner of the coal mining face according to claim 6, characterized in that, It also includes a drive motor, which is arranged outside the liquid storage tank; The filter assembly comprises: A rotating shaft, which is pivotally mounted in the filtration area and is in transmission connection with the drive motor; A turbine, which is sleeved on the rotating shaft and is rotatable relative to the filtration area; and A filter plate, which is arranged in the filtration area and is axially spaced from the turbine along the rotating shaft. The filter plate communicates with the non-filtration area and has a third accommodation cavity and a first side facing the turbine. The third accommodation cavity is used for accommodating the waste residue filtered from the liquid medium. The first side is provided with a waste residue inlet communicating with the third accommodation cavity, and the rotating shaft passes through the waste residue inlet and is rotatably connected to the filter plate.

8. The gas drainage device for the return air corner of the coal mining face according to claim 7, characterized in that, The filtration assembly further includes: A waste discharge pipe, which is connected to the filter plate and communicates with the third accommodation cavity. The end of the waste discharge pipe facing away from the filter plate extends to the outside of the liquid storage tank; and A conveying shaft, which is pivotally connected to the inner cavity of the waste discharge pipe. The axial direction of the conveying shaft is the same as the axial direction of the waste discharge pipe, and at least part of the conveying shaft extends to the outside of the liquid storage tank.

9. The gas drainage device for the return air corner of the coal mining face according to claim 6, characterized in that, It further includes: A housing, which is arranged outside the liquid storage tank and is located below the air extraction box. The housing has a fourth accommodation cavity and is provided with an air inlet and an air outlet communicating with the fourth accommodation cavity. The liquid storage tank is provided with a liquid outlet communicating with the non-filtration area, and the fourth accommodation cavity communicates with the liquid outlet; and A fan, which is pivotally mounted in the fourth accommodation cavity.

10. The gas drainage device for the return air corner of the coal mining face according to claim 9, characterized in that, It further includes a liquid inlet regulation assembly, which is arranged at the liquid outlet to control the injection amount of the liquid medium into the fourth accommodation cavity.

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