Cooling device for coal bed gas drainage and mining pump

Abstract

A cooling device of a coal bed gas drainage and mining pump comprises a coal gas channel, a double-shaft motor and a cooling protective shell. The top of the coal gas channel is provided with a water outlet, and the bottom of the coal gas channel is closed; the double-shaft motor is arranged in the coal gas channel, a partition plate is arranged on the side, close to the water outlet, of the double-shaft motor to form a cooling cavity and a confluence cavity, the double-shaft motor is located in the cooling cavity, a circulating pipe is connected to the outer wall of the coal gas channel and used for communicating the cooling cavity with the confluence cavity, and a first water inlet hole is formed in the side wall of the cooling cavity. A second water inlet hole is formed in the side wall of the confluence cavity; the double-shaft motor is sleeved with the cooling protective shell, the cooling protective shell is connected with the inner wall of the gas channel, and a circulating hole is formed in the cooling protective shell and penetrates through the cooling protective shell in the axial direction of the cooling protective shell; wherein one end of the double-shaft motor is connected with a first fluid driving device, and the first fluid driving device is located on the side, away from the water outlet, of the double-shaft motor; the other end of the double-shaft motor penetrates through the isolation plate through a rotating shaft and is connected with a second fluid driving device.

Description

Technical Field

[0001] The present application belongs to the technical field of coalbed methane extraction, and specifically relates to a cooling device for a coalbed methane extraction pump. Background Art

[0002] In coalbed methane (CBM) extraction operations, drainage pumps are key equipment for efficient CBM collection. Their operating principle is to continuously extract groundwater from the coal seam, thereby reducing the pore pressure within the coal seam. This allows CBM previously adsorbed on the coal matrix to be desorbed and transported along gas production pathways to the surface collection system. Therefore, the stable operation of drainage pumps is directly related to the efficiency and safety of CBM extraction.

[0003] However, the motor of the drainage pump, as the core drive, is constantly exposed to the complex operating conditions within the coal seam. On the one hand, the coal seam environment is often characterized by high temperature, high humidity, and corrosive media. On the other hand, the motor itself continuously generates heat during operation, requiring effective heat dissipation to maintain normal operating temperature. If this heat cannot be dissipated promptly, the motor winding temperature will rise abnormally, causing problems such as accelerated insulation aging and increased wear of mechanical components. In severe cases, it may even cause the motor to burn out, requiring not only downtime for maintenance and increasing maintenance costs, but also potential fluctuations in coal seam pressure due to sudden downtime, disrupting the stability of the coal structure and further impacting subsequent mining operations. Summary of the Invention

[0004] In view of this, the present application provides a coalbed methane extraction pump cooling device, which improves the heat dissipation effect by constructing an active circulation heat dissipation system, thereby extending the service life of the motor and reducing the frequency of shutdown and maintenance.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions:

[0006] The present application provides a coalbed methane drainage pump cooling device, comprising:

[0007] A gas channel, the gas channel being located inside the coal seam, the top of the gas channel being provided with a water outlet, and the bottom of the gas channel being a closed structure;

[0008] A dual-shaft motor is disposed in the gas channel, an isolation plate is provided on a side of the dual-shaft motor near the water outlet, the isolation plate is used to separate the interior of the gas channel into a cooling chamber and a confluence chamber, the dual-shaft motor is located in the cooling chamber, a circulation pipe is connected to the outer peripheral wall of the gas channel, the two ends of the circulation pipe are respectively connected to the cooling chamber and the confluence chamber, a plurality of first water inlet holes are opened on the side wall of the cooling chamber, and a plurality of second water inlet holes are opened on the side wall of the confluence chamber;

[0009] a cooling shield, which is sleeved on the outside of the dual-shaft motor and fixedly connected to the inner wall of the gas channel, and has a plurality of circulation holes formed on the cooling shield. The plurality of circulation holes are spaced apart along the circumference of the cooling shield and penetrate the cooling shield in the axial direction of the cooling shield;

[0010] In which, the first output end of the dual-axis motor is connected to a first fluid driving device, and the first fluid driving device is located on a side of the dual-axis motor away from the water outlet. The first fluid driving device is used to drive the fluid entering the cooling chamber through multiple first water inlet holes, flowing through multiple circulation holes and exchanging heat with the dual-axis motor; the second output end of the dual-axis motor is connected to a rotating shaft, and the rotating shaft extends along the direction of the dual-axis motor toward the water outlet and passes through the isolation plate. The end of the rotating shaft away from the dual-axis motor is connected to a second fluid driving device, and the second fluid driving device is used to drive the fluid that completes heat exchange in the cooling chamber to flow into the confluence chamber through the circulation pipe, and drive the fluid flowing into the confluence chamber through the circulation pipe and the fluid entering the confluence chamber through multiple second water inlets to be discharged through the water outlet together.

[0011] Optionally, a sealing plate is provided on the side of the isolation plate close to the water outlet, and the sealing plate is used to separate the confluence chamber into a boost chamber and a drainage chamber. The drainage chamber is located on the side of the boost chamber close to the water outlet. A drain pipe is also connected to the outer peripheral wall of the gas channel, and the two ends of the drain pipe are respectively connected to the drainage chamber and the boost chamber. A boost mechanism is provided in the boost chamber, and the boost mechanism is connected to the rotating shaft. The boost mechanism is used to drive the fluid flowing into the boost chamber through the circulation pipe and the fluid entering the boost chamber through multiple second water inlet holes to be pressed into the drainage chamber through the drain pipe. A third fluid driving device is provided in the drainage chamber, and the rotating shaft also passes through the sealing plate and is connected to the third fluid driving device. The third fluid driving device is used to drive the fluid in the drainage chamber to be discharged through the water outlet.

[0012] Optionally, the boosting mechanism includes:

[0013] a reciprocating screw, wherein at least a portion of the rotating shaft located between the sealing plate and the isolation plate is the reciprocating screw;

[0014] a slider, the slider being threadedly connected to the reciprocating screw;

[0015] An extrusion plate is fixedly connected to the slider, and the outer peripheral wall of the extrusion plate is in sealed sliding cooperation with the inner wall of the boost chamber. The extrusion plate is used to move back and forth along the axial direction of the boost chamber under the drive of the reciprocating screw to apply pressure to the fluid in the boost chamber.

[0016] Optionally, a plurality of ventilation holes are provided on the side wall of the pressurization chamber and located near the drainage chamber.

[0017] Optionally, the coalbed methane drainage pump cooling device further includes:

[0018] At least two anti-blocking mechanisms, wherein the at least two anti-blocking mechanisms are respectively provided on a side surface of the isolation plate facing the cooling chamber and a side surface facing the confluence chamber;

[0019] Among them, the working range of the anti-blocking mechanism located on the side surface of the isolation plate facing the cooling chamber covers multiple first water inlet holes; the working range of the anti-blocking mechanism located on the side surface of the isolation plate facing the confluence chamber covers multiple second water inlet holes.

[0020] Optionally, the anti-blocking mechanism includes a driving half gear, a driven half gear, a rotating arm, a cleaning roller, a full-circumference gear and an arc-shaped gear ring;

[0021] The driving half gear is fixedly sleeved on the rotating shaft and rotates synchronously with the rotating shaft; the driven half gear is rotatably arranged on the isolation plate through a fixed shaft and meshes with the driving half gear, and the driven half gear can reciprocate under the drive of the driving half gear; one end of the rotating arm is fixedly connected to the driven half gear, and the rotating arm can swing synchronously with the rotation of the driven half gear; the cleaning roller is rotatably arranged at one end of the rotating arm away from the driven half gear, and the outer peripheral surface of the cleaning roller is evenly distributed with A plurality of stopper rods are provided, wherein the stopper rods are used to clear the corresponding first water inlet hole or the second water inlet hole; the full-circumference gear and the cleaning roller are relatively fixed and coaxially arranged, and the cleaning roller can rotate synchronously with the rotation of the full-circumference gear; the arc-shaped gear ring is provided on the isolation plate, and the curvature of the arc-shaped gear ring is adapted to the swing trajectory of the rotating arm, and the arc-shaped gear ring is used to engage with the full-circumference gear, so that during the swinging process of the rotating arm, the cleaning roller is driven to rotate during the swinging process through the meshing transmission of the arc-shaped gear ring and the full-circumference gear.

[0022] Optionally, a return torsion spring is sleeved on the fixed shaft, a first end of the return torsion spring is connected to the driven half gear, and a second end of the return torsion spring is fixed relative to the isolation plate.

[0023] Optionally, when the driving half gear follows the rotation of the rotating shaft, it drives the driven half gear to rotate when it engages with the driven half gear, causing the reset torsion spring to deform to accumulate elastic potential energy; when the driving half gear rotates to a state of disengagement from the driven half gear, the reset torsion spring releases the accumulated elastic potential energy, driving the driven half gear to rotate in the opposite direction, so that the rotating arm drives the cleaning roller to reset.

[0024] Optionally, the coalbed methane drainage pump cooling device further includes:

[0025] A blocking mechanism is provided at the top of the gas channel and is used to block the water outlet.

[0026] Optionally, the blocking mechanism includes:

[0027] at least two limiting holes, each of which is opened at the top of the gas channel along the axial direction of the gas channel, and at least two of the limiting holes are spaced apart along the circumference of the water outlet;

[0028] At least two fixing posts, each of which is provided in a one-to-one correspondence with the limiting holes, each of which extends axially along the corresponding limiting hole, and one end of each fixing post is fixedly connected to the bottom wall of the limiting hole;

[0029] a blocking plate, the blocking plate being a plate-shaped structure and covering a side of the water outlet away from the dual-axis motor, the blocking plate being provided with sliding holes equal in number to the number of the fixing posts, the blocking plate being slidably engaged with the corresponding fixing posts through each of the sliding holes, so as to slide along the axial direction of the fixing posts and having a first position covering the water outlet and a second position opening the water outlet;

[0030] At least two return springs are arranged in a one-to-one correspondence with the fixing columns, and each return spring is sleeved on the corresponding fixing column. The first end of the return spring is connected to the side surface of the blocking plate facing the bottom wall of the limiting hole, and the second end of the return spring is relatively fixed to the bottom wall of the limiting hole. The return spring is used to be in a compressed state when the blocking plate is in the second position to accumulate elastic potential energy, and release the elastic potential energy after the external force acting on the blocking plate disappears, thereby driving the blocking plate to return from the second position to the first position.

[0031] By means of the above technical solution, this application has at least the following beneficial effects:

[0032] In the coalbed methane pump cooling device provided in the embodiments of the present application, a dual-axis motor synchronously drives a first fluid drive device and a second fluid drive device, thereby constructing a heat dissipation system for active circulation of coalbed water. When the production and drainage rate is normal, i.e., there is sufficient coalbed water, with coalbed water as the primary cooling medium, the first fluid drive device drives the coalbed water into the cooling chamber through the first water inlet, where it fully exchanges heat with the dual-axis motor through the circulation hole. The second fluid drive device directs the hot water after heat exchange into the confluence chamber through the circulation pipe, where it is mixed with the new coalbed water from the second water inlet before being discharged, forming an efficient liquid heat dissipation cycle. When the production and drainage rate is close to zero or zero, i.e., little or no coalbed water enters the cooling chamber, the cooling mode automatically switches to air cooling mode. The first fluid drive device accelerates the air circulation speed in the circulation hole through high-speed rotation, using air convection to remove heat from the dual-axis motor. At the same time, the second fluid drive device drives the hot air into the confluence chamber through the circulation pipe, and then discharges it through the water outlet, forming an independent gaseous forced circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of a coalbed methane drainage pump cooling device according to an optional embodiment of the present application from one perspective;

[0034] Figure 2 This is a structural schematic diagram of a coalbed methane drainage pump cooling device according to an optional embodiment of the present application from another perspective;

[0035] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0036] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0037] Figure 5 This is a schematic diagram of the internal structure of a coalbed methane drainage pump cooling device according to an optional embodiment of the present application;

[0038] Figure 6 for Figure 5 A partial enlarged view of point C in the middle.

[0039] The reference numerals indicate:

[0040] 100, gas channel; 101, cooling chamber; 1011, first water inlet; 102, confluence chamber; 1021, pressurization chamber; 10211, second water inlet; 10212, ventilation hole; 1022, drainage chamber;

[0041] 200, dual-axis motor;

[0042] 300, isolation board;

[0043] 400, circulation pipe;

[0044] 500, cooling shell; 501, circulation hole;

[0045] 600, first fluid driving device;

[0046] 700, shaft;

[0047] 800, second fluid driving device;

[0048] 900, sealing plate;

[0049] 1000, drainage pipe;

[0050] 1100, boosting mechanism; 1101, reciprocating screw; 1102, slider; 1103, extrusion plate;

[0051] 1200, third fluid driving device;

[0052] 1300, anti-blocking mechanism; 1301, driving half gear; 1302, driven half gear; 1303, rotating arm; 1304, cleaning roller; 13041, stopper rod; 1305, full-circumference gear; 1306, arc-shaped gear ring; 1307, return torsion spring; 1308, fixed shaft;

[0053] 1400, blocking mechanism; 1401, limiting hole; 1402, fixing column; 1403, blocking plate; 1404, return spring. DETAILED DESCRIPTION

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0055] Furthermore, 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 number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0056] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0058] See also Figures 1 to 6As shown, according to an embodiment of the present application, a coalbed methane extraction pump cooling device is provided, comprising a gas channel 100, a dual-axis motor 200, and a cooling casing 500; the gas channel 100 is located inside the coal seam, a water outlet is provided at the top of the gas channel 100, and the bottom of the gas channel 100 is a closed structure; the dual-axis motor 200 is arranged in the gas channel 100, and an isolation plate 300 is provided on the side of the dual-axis motor 200 close to the water outlet, and the isolation plate 300 is used to separate the interior of the gas channel 100 into a cooling chamber 101 and a confluence chamber 102 The dual-axis motor 200 is located in the cooling chamber 101. A circulation pipe 400 is connected to the outer wall of the gas channel 100. The two ends of the circulation pipe 400 are connected to the cooling chamber 101 and the confluence chamber 102 respectively. The side wall of the cooling chamber 101 is provided with a plurality of first water inlet holes 1011, and the side wall of the confluence chamber 102 is provided with a plurality of second water inlet holes 10211. The cooling shell 500 is sleeved on the outside of the dual-axis motor 200 and fixedly connected to the inner wall of the gas channel 100. The cooling shell 500 is provided with a plurality of circulation holes 501. The holes 501 are distributed at intervals along the circumference of the cooling shell 500 and penetrate the cooling shell 500 along the axial direction of the cooling shell 500; wherein, the first output end of the dual-axis motor 200 is connected to the first fluid driving device 600, and the first fluid driving device 600 is located on the side of the dual-axis motor 200 away from the water outlet. The first fluid driving device is used to drive the fluid entering the cooling chamber 101 through the multiple first water inlet holes 1011, flowing through the multiple circulation holes 501 and exchanging heat with the dual-axis motor 200; the second output end of the dual-axis motor 200 is connected to the first fluid driving device 600. A rotating shaft 700 is connected, and the rotating shaft 700 extends along the direction of the dual-axis motor 200 toward the water outlet and passes through the isolation plate 300. The end of the rotating shaft 700 away from the dual-axis motor 200 is connected to a second fluid driving device 800. The second fluid driving device 800 is used to drive the fluid that completes heat exchange in the cooling chamber 101 to flow into the confluence chamber 102 through the circulation pipe 400, and drive the fluid that flows into the confluence chamber 102 through the circulation pipe 400 and the fluid that enters the confluence chamber 102 through multiple second water inlet holes 10211 to be discharged together through the water outlet.

[0059] In the coalbed methane extraction pump cooling device provided in the embodiments of the present application, a dual-axis motor 200 synchronously drives a first fluid drive device 600 and a second fluid drive device 800, thereby constructing a heat dissipation system for active circulation of coalbed water. When the extraction and extraction rate is normal, i.e., there is sufficient coalbed water, the coalbed water is used as the primary cooling medium. The first fluid drive device 600 drives the coalbed water into the cooling chamber 101 through the first water inlet 1011, where it fully exchanges heat with the dual-axis motor 200 through the circulation hole 501. The second fluid drive device 800 then directs the hot water after heat exchange into the confluence chamber 102 through the circulation pipe 400. The hot water is then mixed with the new coalbed water from the second water inlet 10211 and discharged, forming an efficient liquid heat dissipation cycle. When the extraction and drainage volume is close to zero or is zero, that is, less coalbed water or no coalbed water enters the cooling chamber 101, it automatically switches to air cooling mode. The first fluid driving device 600 accelerates the circulation speed of the air in the circulation hole 501 through high-speed rotation, and uses air convection to take away the heat of the dual-axis motor 200. At the same time, the second fluid driving device 800 drives the hot air through the circulation pipe 400 into the confluence chamber 102, and then discharged through the water outlet, forming an independent gaseous forced circulation.

[0060] The gas channel 100 is a roughly tubular structure and can be used as the main channel inside the coal seam. A water outlet is provided on the top and the bottom is closed. The interior is divided into two upper and lower chambers by an isolation plate 300.

[0061] Specifically, in this coalbed methane extraction pump cooling device, the water outlet at the top of the gas channel 100 serves both as a drainage and exhaust channel, meaning it serves as a channel for both liquid and gaseous media. Inside the gas channel 100, a partition 300 divides it into two independent spaces: a cooling chamber 101 in the lower space and a confluence chamber 102 in the upper space.

[0062] The cooling chamber 101 is the installation area for the dual-axis motor 200 and the location where the cooling medium exchanges heat with the dual-axis motor 200. Its sidewalls are provided with multiple first water inlet holes 1011 for introducing external coalbed water or air. Here, the coalbed water is the liquid cooling medium, and the air is the gaseous cooling medium. It is understood that both the coalbed water and the air are fluids.

[0063] The confluence chamber 102 is used to collect the fluids that have completed heat exchange and the newly introduced fluids, and finally discharge them uniformly through the water outlet at the top. For example, the confluence chamber 102 collects the hot water or hot air flowing in through the circulation pipe 400 and the coal seam water entering through the second water inlet 10211.

[0064] Among them, the dual-axis motor 200 is the power core of the coalbed methane production pump cooling device. It has two output ends, which drive different fluid devices respectively, and is covered with a cooling shell on the outside.

[0065] Among them, the cooling shell is fixed on the inner wall of the gas channel 100 and is sleeved on the outside of the dual-axis motor 200. It is provided with a plurality of circulation holes 501 that penetrate along the axial direction. The plurality of circulation holes 501 are evenly distributed along the circumference of the cooling shell and are used to guide the fluid to pass through and exchange heat with the dual-axis motor 200 to increase the heat exchange area.

[0066] Among them, the first fluid driving device 600 is connected to the first output end of the dual-axis motor 200. The first fluid driving device 600 is located below the dual-axis motor 200 and is used to drive the fluid flow in the cooling chamber 101 so that it exchanges heat with the dual-axis motor 200 through the circulation hole 501.

[0067] Among them, the second output end of the dual-axis motor 200 is connected to the second fluid driving device 800, which is located in the confluence chamber 102 and is used to send the fluid after heat exchange in the cooling chamber 101 into the confluence chamber 102 through the circulation pipe 400, and discharge the mixed fluid in the confluence chamber 102 through the water outlet.

[0068] The circulation pipe 400 is a pipe connecting the cooling chamber 101 and the confluence chamber 102 , and is used to transport the fluid after heat exchange in the cooling chamber 101 to the confluence chamber 102 .

[0069] Specifically, the first fluid drive device 600 can be a fan, and the second fluid drive device 800 can be an impeller. In liquid cooling mode (i.e., when the production and drainage rates are normal and sufficient coal seam water is present in the coal seam), the first fluid drive device 600 is activated, drawing the coal seam water into the cooling chamber 101 through the first water inlet 1011. The coal seam water is driven into the circulation holes 501 of the cooling housing 500. Because the circulation holes 501 are adjacent to the dual-axis motor 200 and are densely distributed, the water flow can fully exchange heat with the dual-axis motor 200, absorbing the heat generated by the operation of the dual-axis motor 200. After heat exchange, the hot water, under the action of the second fluid drive device 800, flows through the circulation pipe 400 into the confluence chamber 102. Simultaneously, the second water inlet 10211 of the confluence chamber 102 introduces new low-temperature coalbed water. After mixing, the two are discharged through the outlet by the second fluid drive device 800, forming a liquid cycle of water intake, heat exchange, and water discharge, efficiently removing heat. In gaseous cooling mode, i.e., when the extraction and discharge rate is close to zero, insufficient or no coalbed water is present, and the first water inlet 1011 cannot introduce sufficient water. At this point, the cooling chamber 101 is primarily filled with air, and air cooling is automatically switched to. The first fluid drive device 600 rotates at high speed, accelerating the air flow within the circulation holes 501 of the cooling shell 500, removing heat through convection between the air and the dual-axis motor 200. After heat exchange, the hot air, driven by the second fluid drive device 800, enters the confluence chamber 102 through the circulation pipe 400. At this point, no new water may enter the second water inlet 10211. The hot air is directly discharged through the water outlet by the second fluid drive device 800, forming a forced gaseous cycle of air intake, convective heat exchange, and hot air exhaust, ensuring that the dual-axis motor 200 does not overheat. This solves the problem of heat dissipation failure when there is insufficient coalbed water.

[0070] In some possible implementations disclosed in this application, see Figure 3 and Figure 5As shown, a sealing plate 900 is provided on the side of the isolation plate 300 close to the water outlet. The sealing plate 900 is used to separate the confluence chamber 102 into a pressurized chamber 1021 and a drainage chamber 1022. The drainage chamber 1022 is located on the side of the pressurized chamber 1021 close to the water outlet. A drainage pipe 1000 is also connected to the outer peripheral wall of the gas channel 100. The two ends of the drainage pipe 1000 are respectively connected to the drainage chamber 1022 and the pressurized chamber 1021. A pressurizing mechanism 1100 is provided in the pressurizing chamber 1021. The pressurizing mechanism 1100 is connected to the rotary The shaft 700 is connected, and the boosting mechanism 1100 is used to drive the fluid flowing into the boosting chamber 1021 through the circulation pipe 400 and the fluid entering the boosting chamber 1021 through multiple second water inlet holes 10211, and is pressed into the drainage chamber 1022 through the drain pipe 1000. A third fluid driving device 1200 is provided in the drainage chamber 1022. The rotating shaft 700 also passes through the sealing plate 900 and is connected to the third fluid driving device 1200. The third fluid driving device 1200 is used to drive the fluid in the drainage chamber 1022 to be discharged through the water outlet.

[0071] In this embodiment, a pressurizing mechanism 1100 is provided within pressurizing chamber 1021 to pressurize the fluid entering therein, allowing the fluid to flow more smoothly through drain pipe 1000 into drainage chamber 1022, ensuring continuous discharge. Simultaneously, a third fluid drive device 1200 is provided within drainage chamber 1022 to discharge the fluid through the outlet, forming a relay with pressurizing mechanism 1100, further improving drainage efficiency and maintaining good heat dissipation.

[0072] The addition of a sealing plate 900 to the confluence chamber 102 divides the confluence chamber 102 into two independent spaces: a pressurization chamber 1021 located in the lower space and a drainage chamber 1022 located in the upper space. The pressurization chamber 1021 receives the hot fluid flowing in through the circulation pipe 400 and the new fluid entering through the second water inlet 10211. The drainage chamber 1022, located adjacent to the water outlet, is used to ultimately discharge the mixed fluid.

[0073] A drainage pipe 1000 is provided on the outer peripheral wall of the gas channel 100 , which can connect the pressurization chamber 1021 with the drainage chamber 1022 to form a fluid transmission path.

[0074] Among them, the boosting mechanism 1100 is located in the boosting chamber 1021, and is connected to the second output end of the dual-axis motor 200 through the rotating shaft 700, so as to obtain power synchronously to mix and pressurize the two fluids entering the boosting chamber 1021, thereby achieving the purpose of pressing the mixed fluid into the drainage chamber 1022 through the drain pipe 1000, thereby increasing the fluid circulation speed.

[0075] The third fluid drive device 1200 is located within the drainage chamber 1022 and is driven by the rotating shaft 700 that penetrates the sealing plate 900. This device forms a relay mechanism for pressurization and drainage, ensuring continuous and efficient fluid discharge. In gaseous cooling mode, forced air circulation is maintained through high-speed rotation.

[0076] Specifically, the third fluid drive device 1200 may be a spiral plate. In liquid cooling mode, coalbed water sequentially passes through the first water inlet 1011, the cooling chamber 101, the circulation hole 501 for heat exchange, and the circulation pipe 400 to the pressurization chamber 1021. New coalbed water passes through the second water inlet 10211 to the pressurization chamber 1021. The two fluids are mixed and pressurized in the pressurization chamber 1021, then pass through the drain pipe 1000 to the drain chamber 1022. Under the action of the third fluid drive device 1200, they are accelerated and discharged through the water outlet. In gaseous cooling mode, air sequentially passes through the first water inlet 1011, the cooling chamber 101, the circulation hole 501 for heat exchange, and the circulation pipe 400 to the pressurization chamber 1021. If a small amount of air or water passes through the second water inlet 10211 to the pressurization chamber 1021, the pressure is too high. The mixed gas is pressurized in the pressurizing chamber 1021 , passes through the drain pipe 1000 to the drain chamber 1022 , and is forcibly exhausted through the water outlet under the action of the third fluid driving device 1200 .

[0077] In some possible implementations disclosed in this application, see Figure 5 As shown, the boosting mechanism 1100 includes a reciprocating screw, a slider 1102 and an extrusion plate 1103; at least the portion of the rotating shaft 700 located between the sealing plate 900 and the isolation plate 300 is a reciprocating screw; the slider 1102 is threadedly connected to the reciprocating screw; the extrusion plate 1103 is fixedly connected to the slider 1102, and the outer peripheral wall of the extrusion plate 1103 is sealed and slidably matched with the inner wall of the boosting chamber 1021, and the extrusion plate 1103 is used to move back and forth along the axial direction of the boosting chamber 1021 under the drive of the reciprocating screw to apply pressure to the fluid in the boosting chamber 1021.

[0078] In this embodiment, when the reciprocating screw rotates, it drives the slider 1102 to reciprocate along the axis of the reciprocating screw, thereby driving the extrusion plate 1103 to slide back and forth axially within the pressurization chamber 1021. Because the outer peripheral wall of the extrusion plate 1103 slides in a sealed manner with the inner wall of the pressurization chamber 1021, its reciprocating motion can periodically squeeze the fluid within the pressurization chamber 1021, converting mechanical energy into fluid pressure energy, significantly increasing the fluid pressure. This ensures that the fluid after heat exchange can efficiently pass through the drain pipe 1000 and enter the drain chamber 1022, avoiding circulation stagnation caused by resistance.

[0079] The outer peripheral surface of at least a portion of the rotating shaft 700 between the sealing plate 900 and the isolation plate 300 is in a reciprocating spiral shape to form a reciprocating screw, which rotates synchronously with the dual-axis motor 200 .

[0080] The slider 1102 is connected to the reciprocating screw by a thread and is an intermediate component that converts the rotational motion of the reciprocating screw into linear motion. When the reciprocating screw rotates, the slider 1102 moves back and forth along the axial direction of the reciprocating screw.

[0081] The extrusion plate 1103 is fixedly connected to the slider 1102, such as by welding or bolting, so that the reciprocating motion of the slider 1102 directly drives the synchronous movement of the extrusion plate 1103. Here, the outer peripheral wall of the extrusion plate 1103 and the inner wall of the pressurizing chamber 1021 can be sealed and slidably engaged by installing a sealing ring, etc., to ensure that fluid does not leak through the gap and that the extrusion plate 1103 can move smoothly along the axial direction of the pressurizing chamber 1021.

[0082] Specifically, when the extrusion plate 1103 moves toward the second fluid drive device 800, the effective volume of the pressurization chamber 1021 decreases, compressing the fluid between the extrusion plate 1103 and the second fluid drive device 800 and increasing the pressure. When the extrusion plate 1103 moves away from the second fluid drive device 800, the effective volume of the pressurization chamber 1021 increases, allowing more fluid to be drawn in. It should be noted that the space between the extrusion plate 1103 and the second fluid drive device 800 is a semi-enclosed structure. However, due to the restriction of the second fluid drive device 800, fluid can only flow toward the extrusion plate 1103. Consequently, under the action of the extrusion plate 1103, fluid is pressed through the drain pipe 1000 into the drainage chamber 1022.

[0083] In some possible implementations disclosed in this application, see Figure 3 and Figure 5 As shown, a plurality of ventilation holes 10212 are provided on the side wall of the pressurization chamber 1021 and located near the drainage chamber 1022 .

[0084] In this embodiment, by providing a plurality of ventilation holes 10212 on the sidewall of the pressurizing chamber 1021, near the drainage chamber 1022, it is possible to effectively prevent gas from accumulating and forming air resistance in the space on the side of the extrusion plate 1103 facing away from the second fluid driving device 800, thereby preventing this air resistance from hindering the reciprocating movement of the extrusion plate 1103. Specifically, when the extrusion plate 1103 moves away from the second fluid driving device 800 driven by the reciprocating screw, the volume of the space on the side facing away from the second fluid driving device 800 decreases. If gas exists in this space and cannot be discharged in time, it will easily accumulate and form air resistance. The ventilation hole 10212 arranged near the drainage chamber 1022 can provide a circulation channel for the gas in the side space at the extreme position during the movement of the extrusion plate 1103, so that the gas can be discharged smoothly through the ventilation hole 10212, thereby eliminating the adverse effects of air resistance on the reciprocating movement of the extrusion plate 1103 and ensuring the smooth movement of the extrusion plate 1103.

[0085] In some possible implementations disclosed in this application, see Figure 3 and Figure 5 As shown, the coalbed methane extraction pump cooling device also includes at least two anti-blocking mechanisms 1300, and the at least two anti-blocking mechanisms 1300 are respectively arranged on the side surface of the isolation plate 300 facing the cooling chamber 101 and the side surface facing the confluence chamber 102; wherein, the working range of the anti-blocking mechanism 1300 located on the side surface of the isolation plate 300 facing the cooling chamber 101 covers multiple first water inlet holes 1011; the working range of the anti-blocking mechanism 1300 located on the side surface of the isolation plate 300 facing the confluence chamber 102 covers multiple second water inlet holes 10211.

[0086] In this embodiment, the anti-blocking mechanism 1300 directly acts on the coverage area of ​​the first water inlet hole 1011 and the second water inlet hole 10211, effectively removing impurities such as coal slag and sand that may accumulate at the orifices, thereby preventing the cooling medium from being unable to normally enter the cooling chamber 101 and the confluence chamber 102 due to blockage. This ensures an adequate supply of coalbed water in the liquid cooling mode and smooth air circulation in the gas cooling mode, providing a foundation for stable switching and efficient operation of the two cooling modes.

[0087] Among them, the multiple first water inlet holes 1011 and the multiple second water inlet holes 10211 are symmetrically distributed up and down, providing a unified range of action and layout basis for the anti-blocking mechanism 1300, so that the two anti-blocking mechanisms 1300 can adopt the same structural form and movement trajectory.

[0088] Specifically, from a spatial perspective, along the axial direction (i.e., vertical direction) of gas channel 100, first water inlet 1011 is located on the sidewall of cooling chamber 101 below isolation plate 300, while second water inlet 10211 is located on the sidewall of confluence chamber 102 above isolation plate 300. Their horizontal projections overlap. This allows the anti-clogging mechanisms 1300 on both sides to operate in the same manner at symmetrical locations, ensuring uniform coverage of each of the first and second water inlet holes 1011, 10211, and preventing issues with misaligned locations that could prevent some holes from being left uncovered.

[0089] In some possible implementations disclosed in this application, see Figure 6 As shown, the anti-blocking mechanism 1300 includes a driving half gear 1301, a driven half gear 1302, a rotating arm 1303, a cleaning roller 1304, a full-circumference gear 1305 and an arc-shaped gear ring 1306; the driving half gear 1301 is fixedly sleeved on the rotating shaft 700 and rotates synchronously with the rotating shaft 700; the driven half gear 1302 is rotatably set on the isolation plate 300 through a fixed shaft 1308 and meshes with the driving half gear 1301. The driven half gear 1302 can reciprocate under the drive of the driving half gear 1301; one end of the rotating arm 1303 is fixedly connected to the driven half gear 1302, and the rotating arm 1303 can swing synchronously with the rotation of the driven half gear 1302; the cleaning roller 1304 is rotatably set on the rotating arm 1303 away from the driven half gear At one end of the half gear 1302, a plurality of stopper rods 13041 are evenly distributed on the outer circumferential surface of the cleaning roller 1304, and the stopper rods 13041 are used to dredge the corresponding first water inlet hole 1011 or the second water inlet hole 10211; the full-circle gear 1305 and the cleaning roller 1304 are relatively fixed and coaxially arranged, and the cleaning roller 1304 can rotate synchronously with the rotation of the full-circle gear 1305; the arc-shaped gear ring 1306 is arranged on the isolation plate 300, and the curvature of the arc-shaped gear ring 1306 is adapted to the swing trajectory of the rotating arm 1303, and the arc-shaped gear ring 1306 is used to engage with the full-circle gear 1305, so that during the swinging process of the rotating arm 1303, the meshing transmission of the arc-shaped gear ring 1306 and the full-circle gear 1305 is used to drive the cleaning roller 1304 to rotate during the swinging process.

[0090] In this embodiment, when the driving half-gear 1301 meshes with the driven half-gear 1302, the driven half-gear 1302 swings back and forth with the rotation of the driving half-gear 1301, driving the pivot arm 1303 and cleaning roller 1304 to swing along an arc. This ensures that the working range of the cleaning roller 1304 fully covers multiple water inlets, preventing partial omissions. Simultaneously, as the pivot arm 1303 swings, the full-circumference gear 1305 on the cleaning roller 1304 continuously meshes with the fixed arc-shaped gear ring 1306, driving the cleaning roller 1304 to rotate synchronously. The stopper rod 13041 on the outer periphery of the cleaning roller 1304 alternately inserts into each water inlet as it rotates. This not only physically removes clogged coal slag and sand from the holes, but also scrapes away impurities adhering to the periphery of the holes through its rotation. This dual cleaning effect of swinging coverage and rotating dredging significantly improves the dredging effect.

[0091] The driving half gear 1301 is the power input shaft of the anti-blocking mechanism 1300, which is fixed to the rotating shaft 700 and rotates synchronously with the rotating shaft 700. Here, the driving half gear 1301 has teeth on only half of its circumference, and the other half is toothless. Therefore, during rotation, it periodically engages and disengages with the driven half gear 1302.

[0092] Driven half-gear 1302 is mounted on isolation plate 300 via fixed shaft 1308, allowing for free rotation and meshing with driving half-gear 1301. Driven by driving half-gear 1301, the latter is partially toothed. When the toothless portion of driving half-gear 1301 engages, driven half-gear 1302 loses power and, due to its own inertia or reset mechanism, reciprocates, resulting in a side-to-side swing.

[0093] Among them, the rotating arm 1303 is equivalent to a connecting rod, one end of which is fixed to the driven half gear 1302, and the other end is equipped with a cleaning roller 1304. Here, the rotating arm 1303 swings synchronously with the reciprocating rotation of the driven half gear 1302, and the trajectory is an arc, driving the cleaning roller 1304 to move back and forth in the area where the water inlet is located.

[0094] The cleaning roller 1304 is rotatably mounted at the end of the rotating arm 1303, and has a plurality of stopper rods 13041 evenly distributed around the periphery. The stopper rods 13041 are similar to small cylinders or spikes. Here, the stopper rods 13041 are inserted into the corresponding first water inlet hole 1011 or second water inlet hole 10211 to clear the blockage.

[0095] Wherein, the full circumference gear 1305 is a complete gear, is positioned at the extension shaft of the cleaning roller 1304, and the two rotate synchronously. Here, the full circumference gear 1305 is used for external power transmission to the cleaning roller 1304, drives its rotation.

[0096] The curved toothed ring 1306 is fixed to the isolation plate 300, and its curvature matches the swing trajectory of the pivot arm 1303. This means that when the pivot arm 1303 swings, the full-circumference gear 1305 is always in contact with the curved toothed ring 1306. The meshing of the curved toothed ring 1306 and the full-circumference gear 1305 provides the power source for the rotation of the cleaning roller 1304. As the pivot arm 1303 swings, the full-circumference gear 1305 rolls along the curved toothed ring 1306, forcing the cleaning roller 1304 to rotate through this meshing transmission.

[0097] In the above embodiment, see Figure 6 As shown, a return torsion spring 1307 is sleeved on the fixed shaft 1308 , a first end of the return torsion spring 1307 is connected to the driven half gear 1302 , and a second end of the return torsion spring 1307 is fixed relative to the isolation plate 300 .

[0098] It should be noted that when driving half-gear 1301 rotates to the toothless portion, its meshing relationship with driven half-gear 1302 is interrupted. At this point, the return torsion spring 1307, through its own elastic deformation, generates a restoring force, driving the driven half-gear 1302 to rotate in the opposite direction and reset itself. This allows the driven half-gear 1302 to form a regular and stable reciprocating oscillation, driven by the driving half-gear 1301 and reset by the torsion spring. This ensures that the rotating arm 1303 and cleaning roller 1304 can move back and forth along an arc to cover all water inlet holes, avoiding blind spots in the cleaning process caused by stuck or misaligned movement of the driven half-gear 1302.

[0099] In the above embodiment, see Figure 6 As shown, when the driving half gear 1301 follows the rotation of the rotating shaft 700, it drives the driven half gear 1302 to rotate when it is engaged with the driven half gear 1302, causing the reset torsion spring 1307 to deform to accumulate elastic potential energy; when the driving half gear 1301 rotates to a state of disengagement from the driven half gear 1302, the reset torsion spring 1307 releases the accumulated elastic potential energy, driving the driven half gear 1302 to rotate in the opposite direction, causing the rotating arm 1303 to drive the cleaning roller 1304 to reset.

[0100] It should be noted that when driving half-gear 1301 rotates with rotating shaft 700, its toothed portion meshes with driven half-gear 1302, driving driven half-gear 1302 to rotate, simultaneously deforming return torsion spring 1307 and accumulating elastic potential energy. When driving half-gear 1301 rotates to the toothless portion and disengages from driven half-gear 1302, return torsion spring 1307 releases its elastic potential energy, driving driven half-gear 1302 to rotate in the opposite direction, thereby resetting rotating arm 1303 and cleaning roller 1304. This process creates a regular and stable reciprocating motion, ensuring that cleaning roller 1304 can swing back and forth within the coverage area of ​​first water inlet hole 1011 or second water inlet hole 10211, avoiding the problem of cleaning roller 1304 stagnation caused by power transmission interruption. Furthermore, because the driven half-gear 1302 can swing back and forth under the drive of the driving half-gear 1301 and the action of the return torsion spring 1307, the rotating arm 1303 drives the cleaning roller 1304 to continuously move back and forth along an arc-shaped trajectory. This movement allows the stopper rod 13041 on the cleaning roller 1304 to cover all of the first water inlet holes 1011 or the second water inlet holes 10211, eliminating blind spots and effectively preventing clogging of some holes due to not being cleaned.

[0101] In some possible implementations disclosed in this application, see Figure 2 and Figure 3 As shown, the coalbed methane drainage pump cooling device further includes a blocking mechanism 1400 . The blocking mechanism 1400 is disposed at the top of the gas channel 100 , and is used to block the water outlet.

[0102] In this embodiment, by providing a blocking mechanism 1400 to block and open the water outlet, the discharge state of the cooling medium can be flexibly controlled according to actual operating conditions. For example, when equipment is undergoing overhaul or maintenance, or when drainage operations need to be suspended, closing the blocking mechanism 1400 can prevent external impurities from entering the device through the water outlet, preventing contamination or blockage of internal components and ensuring internal cleanliness of the device.

[0103] In some possible implementations disclosed in this application, see Figure 4As shown, the blocking mechanism 1400 includes at least two limiting holes 1401, at least two fixing columns 1402, a blocking plate 1403 and at least two return springs 1404; the limiting holes 1401 are opened at the top of the gas channel 100 along the axial direction of the gas channel 100, and at least two limiting holes 1401 are distributed at intervals along the circumference of the water outlet; the fixing columns 1402 are arranged in a one-to-one correspondence with the limiting holes 1401, and each fixing column 1402 extends along the axial direction of the corresponding limiting hole 1401, and one end of the fixing column 1402 is fixedly connected to the bottom wall of the limiting hole 1401; the blocking plate 1403 is a plate-shaped structure and covers the side of the water outlet away from the dual-axis motor 200, and the blocking plate 1403 is provided with sliding holes equal to the number of the fixing columns 1402. The holes are respectively slidably matched with the corresponding fixed columns 1402 to slide along the axial direction of the fixed columns 1402 and have a first position covering the water outlet and a second position opening the water outlet; the return springs 1404 are arranged in a one-to-one correspondence with the fixed columns 1402, and each return spring 1404 is sleeved on the corresponding fixed column 1402. The first end of the return spring 1404 is connected to the side surface of the sealing plate 1403 facing the bottom wall of the limiting hole 1401, and the second end of the return spring 1404 is relatively fixed to the bottom wall of the limiting hole 1401. The return spring 1404 is used to be in a compressed state when the sealing plate 1403 is in the second position to accumulate elastic potential energy, and release the elastic potential energy after the external force acting on the sealing plate 1403 disappears, driving the sealing plate 1403 to reset from the second position to the first position.

[0104] In this embodiment, by sliding the blocking plate 1403 along the fixed column 1402, it is possible to switch between the first position covering the water outlet and the second position opening the water outlet to meet the needs of different working conditions. For example, during operation, the blocking plate 1403 is in the second position to open the water outlet to ensure smooth discharge of the fluid; when maintenance or suspension of operation, the blocking plate 1403 is reset to the first position to close the water outlet to prevent external impurities from entering the interior of the device. The reset spring 1404 is mounted on the fixed column 1402. When the blocking plate 1403 is in the second position, that is, the open state, the reset spring 1404 is compressed and accumulates elastic potential energy. Once the external force acting on the blocking plate 1403 disappears, the reset spring 1404 will release the elastic potential energy and drive the blocking plate 1403 to automatically reset from the second position to the first position, thereby realizing automatic blocking of the water outlet. No additional power is required, the structure is simple, and the reliability is high. The limiting hole 1401 is opened axially along the top of the gas channel 100, the fixing column 1402 corresponds to the limiting hole 1401 one by one and one end is fixed to the bottom wall of the limiting hole 1401, and the blocking plate 1403 slides with the fixing column 1402 through the sliding hole. This structural design provides a stable guide for the sliding of the blocking plate 1403, avoiding the blocking plate 1403 from offsetting or getting stuck during the movement, and ensuring that it can accurately cover or open the water outlet.

[0105] Specifically, during the drainage process, when the fluid pressure in the drainage chamber 1022 is sufficient, the sealing plate 1403 will be pushed to overcome the elastic force of the return spring 1404 and slide to the second position, allowing the fluid to be discharged smoothly; when the fluid pressure is insufficient, the elastic force of the return spring 1404 will lead the sealing plate 1403 to reset and achieve automatic closing. It can adaptively adjust the water outlet state according to the fluid pressure to adapt to different drainage pressure conditions.

[0106] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0107] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A coalbed methane extraction pump cooling device, characterized in that: include: A gas channel, the gas channel being located inside the coal seam, the top of the gas channel being provided with a water outlet, and the bottom of the gas channel being a closed structure; A dual-shaft motor is disposed in the gas channel, an isolation plate is provided on a side of the dual-shaft motor near the water outlet, the isolation plate is used to separate the interior of the gas channel into a cooling chamber and a confluence chamber, the dual-shaft motor is located in the cooling chamber, a circulation pipe is connected to the outer peripheral wall of the gas channel, the two ends of the circulation pipe are respectively connected to the cooling chamber and the confluence chamber, a plurality of first water inlet holes are opened on the side wall of the cooling chamber, and a plurality of second water inlet holes are opened on the side wall of the confluence chamber; a cooling shield, which is sleeved on the outside of the dual-shaft motor and fixedly connected to the inner wall of the gas channel, and has a plurality of circulation holes formed on the cooling shield. The plurality of circulation holes are spaced apart along the circumference of the cooling shield and penetrate the cooling shield in the axial direction of the cooling shield; In which, the first output end of the dual-axis motor is connected to a first fluid driving device, and the first fluid driving device is located on a side of the dual-axis motor away from the water outlet. The first fluid driving device is used to drive the fluid entering the cooling chamber through multiple first water inlet holes, flowing through multiple circulation holes and exchanging heat with the dual-axis motor; the second output end of the dual-axis motor is connected to a rotating shaft, and the rotating shaft extends along the direction of the dual-axis motor toward the water outlet and passes through the isolation plate. The end of the rotating shaft away from the dual-axis motor is connected to a second fluid driving device, and the second fluid driving device is used to drive the fluid that completes heat exchange in the cooling chamber to flow into the confluence chamber through the circulation pipe, and drive the fluid flowing into the confluence chamber through the circulation pipe and the fluid entering the confluence chamber through multiple second water inlets to be discharged through the water outlet together.

2. The cooling device for coalbed methane drainage pump according to claim 1, characterized in that: A sealing plate is provided on the side of the isolation plate close to the water outlet, and the sealing plate is used to separate the confluence chamber into a boost chamber and a drainage chamber. The drainage chamber is located on the side of the boost chamber close to the water outlet. A drainage pipe is also connected to the outer peripheral wall of the gas channel, and the two ends of the drainage pipe are respectively connected to the drainage chamber and the boost chamber. A boost mechanism is provided in the boost chamber, and the boost mechanism is connected to the rotating shaft. The boost mechanism is used to drive the fluid flowing into the boost chamber through the circulation pipe and the fluid entering the boost chamber through multiple second water inlet holes to be pressed into the drainage chamber through the drain pipe. A third fluid driving device is provided in the drainage chamber, and the rotating shaft also passes through the sealing plate and is connected to the third fluid driving device. The third fluid driving device is used to drive the fluid in the drainage chamber to be discharged through the water outlet.

3. The cooling device for coalbed methane drainage pump according to claim 2, characterized in that: The boosting mechanism comprises: a reciprocating screw, wherein at least a portion of the rotating shaft located between the sealing plate and the isolation plate is the reciprocating screw; a slider, the slider being threadedly connected to the reciprocating screw; An extrusion plate is fixedly connected to the slider, and the outer peripheral wall of the extrusion plate is in sealed sliding cooperation with the inner wall of the boost chamber. The extrusion plate is used to move back and forth along the axial direction of the boost chamber under the drive of the reciprocating screw to apply pressure to the fluid in the boost chamber.

4. The cooling device for coalbed methane drainage pump according to claim 2, characterized in that: A plurality of ventilation holes are provided on the side wall of the pressurizing chamber and located near the drainage chamber.

5. The cooling device for coalbed methane drainage pump according to claim 1, characterized in that: Also includes: At least two anti-blocking mechanisms, wherein the at least two anti-blocking mechanisms are respectively provided on a side surface of the isolation plate facing the cooling chamber and a side surface facing the confluence chamber; Among them, the working range of the anti-blocking mechanism located on the side surface of the isolation plate facing the cooling chamber covers multiple first water inlet holes; the working range of the anti-blocking mechanism located on the side surface of the isolation plate facing the confluence chamber covers multiple second water inlet holes.

6. The cooling device for coalbed methane drainage pump according to claim 5, characterized in that: The anti-blocking mechanism includes a driving half gear, a driven half gear, a rotating arm, a cleaning roller, a full-circumference gear and an arc-shaped gear ring; The driving half gear is fixedly sleeved on the rotating shaft and rotates synchronously with the rotating shaft; the driven half gear is rotatably arranged on the isolation plate through a fixed shaft and meshes with the driving half gear, and the driven half gear can reciprocate under the drive of the driving half gear; one end of the rotating arm is fixedly connected to the driven half gear, and the rotating arm can swing synchronously with the rotation of the driven half gear; the cleaning roller is rotatably arranged at one end of the rotating arm away from the driven half gear, and the outer peripheral surface of the cleaning roller is evenly distributed with A plurality of stopper rods are provided, wherein the stopper rods are used to clear the corresponding first water inlet hole or the second water inlet hole; the full-circumference gear and the cleaning roller are relatively fixed and coaxially arranged, and the cleaning roller can rotate synchronously with the rotation of the full-circumference gear; the arc-shaped gear ring is provided on the isolation plate, and the curvature of the arc-shaped gear ring is adapted to the swing trajectory of the rotating arm, and the arc-shaped gear ring is used to engage with the full-circumference gear, so that during the swinging process of the rotating arm, the cleaning roller is driven to rotate during the swinging process through the meshing transmission of the arc-shaped gear ring and the full-circumference gear.

7. The cooling device for coalbed methane drainage pump according to claim 6, characterized in that: A return torsion spring is sleeved on the fixed shaft, a first end of the return torsion spring is connected to the driven half gear, and a second end of the return torsion spring is fixed relatively to the isolation plate.

8. The cooling device for coalbed methane drainage pump according to claim 7, characterized in that: When the driving half gear follows the rotation of the rotating shaft, it drives the driven half gear to rotate when it is engaged with the driven half gear, causing the return torsion spring to deform to accumulate elastic potential energy; when the driving half gear rotates to a state of disengagement from the driven half gear, the return torsion spring releases the accumulated elastic potential energy, driving the driven half gear to rotate in the opposite direction, so that the rotating arm drives the cleaning roller to reset.

9. The cooling device for coalbed methane drainage pump according to claim 1, characterized in that: Also includes: A blocking mechanism is provided at the top of the gas channel and is used to block the water outlet.

10. The cooling device for coalbed methane drainage pump according to claim 9, characterized in that: The blocking mechanism comprises: at least two limiting holes, each of which is opened at the top of the gas channel along the axial direction of the gas channel, and at least two of the limiting holes are spaced apart along the circumference of the water outlet; At least two fixing posts, each of which is provided in a one-to-one correspondence with the limiting holes, each of which extends axially along the corresponding limiting hole, and one end of each fixing post is fixedly connected to the bottom wall of the limiting hole; a blocking plate, the blocking plate being a plate-shaped structure and covering a side of the water outlet away from the dual-axis motor, the blocking plate being provided with sliding holes equal in number to the number of the fixing posts, the blocking plate being slidably engaged with the corresponding fixing posts through each of the sliding holes, so as to slide along the axial direction of the fixing posts and having a first position covering the water outlet and a second position opening the water outlet; At least two return springs are arranged in a one-to-one correspondence with the fixing columns, and each return spring is sleeved on the corresponding fixing column. The first end of the return spring is connected to the side surface of the blocking plate facing the bottom wall of the limiting hole, and the second end of the return spring is relatively fixed to the bottom wall of the limiting hole. The return spring is used to be in a compressed state when the blocking plate is in the second position to accumulate elastic potential energy, and release the elastic potential energy after the external force acting on the blocking plate disappears, thereby driving the blocking plate to return from the second position to the first position.

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