Drainage device, drainage pump and coalbed methane mining equipment

Abstract

The embodiment of the present application relates to the field of coalbed methane drainage technology, and particularly discloses a drainage device, a drainage pump and coalbed methane mining equipment, including a pipe body, a piston and a one-way valve, the pipe body is provided with a receiving cavity inside, one end of the pipe body is provided with a liquid outlet connected to the receiving cavity, the other end of the pipe body is used to connect with a lifting device, the peripheral wall of the pipe body is also provided with a drainage hole, the drainage hole can connect the receiving cavity with the outside of the pipe body, the piston is movably arranged in the receiving cavity, a liquid hole is provided in the piston, the end of the liquid hole away from the liquid outlet is used to communicate with the lifting device, the one-way valve is arranged in the receiving cavity, the one-way valve is connected to the end of the piston facing the liquid outlet, the one-way valve is connected to the liquid hole, the piston can move between a first position and a second position relative to the pipe body, in the first state, the fluid can be discharged from the liquid outlet of the pipe body, and in the second state, the fluid can be discharged from the drainage hole of the pipe body. In the above manner, the embodiment of the present application can reduce the deposition of solid particles in the pipe body.

Description

Technical Field

[0001] The present application relates to the technical field of coalbed methane drainage, and in particular to a drainage device, a drainage pump and coalbed methane mining equipment. Background Art

[0002] The drainage and gas production process of coalbed methane refers to a technology that reduces the pressure of coal seams by draining water during the development of coalbed methane, thereby increasing the extraction of coalbed methane. Coalbed methane is an unconventional natural gas resource adsorbed in coal seams, and its main component is methane. The drainage and gas production process is one of the key steps to improve the recovery rate of coalbed methane. In related technologies, pumps are usually used for drainage. During the drainage process, solid particles such as sand, coal powder, paraffin and inorganic salts in the well fluid are continuously deposited in the pump, which can easily cause pump blockage accidents and affect normal production. Summary of the invention

[0003] In view of the above problems, the embodiments of the present application provide a drainage device, a drainage pump and coalbed methane extraction equipment, which overcome the above problems or at least partially solve the above problems.

[0004] According to one aspect of the present application, a liquid discharge device is provided, including a tube body, a accommodating chamber is provided inside the tube body, a liquid outlet communicated with the accommodating chamber is provided at one end of the tube body, the other end of the tube body is used to connect with the lifting device, and a liquid discharge hole is also provided on the peripheral wall of the tube body, and the liquid discharge hole can connect the accommodating chamber with the outside of the tube body; a piston, the piston is movably arranged in the accommodating chamber, a liquid passage hole is provided in the piston, and the end of the liquid passage hole away from the liquid outlet is used to communicate with the lifting device; a one-way valve, the one-way valve is arranged in the accommodating chamber, the one-way valve is connected to the end of the piston facing the liquid outlet, and the one-way valve is communicated with the liquid passage hole; wherein, the piston can be moved relative to the tube body The lifting device can move between a first position and a second position. When the piston moves to the first position, the drainage hole and the accommodating chamber are closed, and when the piston moves to the second position, the drainage hole and the accommodating chamber are connected. In the first state, the lifting device inputs fluid into the liquid hole, and the fluid pushes the piston to move toward the one-way valve to the first position, and the fluid passes through the liquid hole, the one-way valve, and the accommodating chamber in sequence and is discharged from the liquid outlet. In the second state, the lifting device stops inputting fluid into the liquid hole, and the fluid in the accommodating chamber pushes the piston to move in the direction away from the one-way valve to the second position, and the fluid in the accommodating chamber is discharged through the drainage hole.

[0005] In an optional manner, the piston includes a first piston section and a second piston section that are connected to each other, and the end of the first piston section that faces away from the second piston section is connected to the one-way valve; a liquid gap is provided between the outer peripheral wall of the first piston section and the inner cavity wall of the accommodating cavity, and the outer peripheral wall of the second piston section abuts against the inner cavity wall of the accommodating cavity; when the piston moves to the first position, the second piston section can close the drainage hole; when the piston moves to the second position, the liquid gap can connect the accommodating cavity and the drainage hole.

[0006] In an optional manner, the accommodating chamber includes a first chamber section and a second chamber section that are connected to each other, wherein one end of the first chamber section facing away from the second chamber section is connected to the liquid outlet, and the second chamber section is connected to the drainage hole; the first piston section can move between the first chamber section and the second chamber section, and the second piston section can be movably arranged in the second chamber section; when the piston moves to the first position, the first piston section is arranged in the first chamber section, and the second piston section closes the drainage hole; when the piston moves to the second position, the first piston section is at least partially arranged in the second chamber section, and the liquid gap can connect the accommodating chamber and the drainage hole.

[0007] In an optional manner, the piston also includes a third piston segment, which is connected between the first piston segment and the second piston segment, and the liquid gap is provided between the first piston segment and the first cavity segment; when the piston moves to the first position, the third piston segment is arranged in the first cavity segment, so that the liquid gap is not connected to the drainage hole; when the piston moves to the second position, the third piston segment is arranged in the second cavity segment, so that the liquid gap is connected to the drainage hole.

[0008] In an optional manner, a first sealing ring is provided between the second piston segment and the second chamber segment, and the first sealing ring is arranged on the side of the drainage hole away from the one-way valve; and / or a second sealing ring is provided on the outer sleeve of the third piston segment, and when the piston moves to the first position, the second sealing ring abuts against the inner wall of the first chamber segment.

[0009] In an optional manner, a first limiting step is provided at one end of the second piston segment facing the first piston segment, and a second limiting step is provided between the first cavity segment and the second cavity segment; when the piston moves to the first position, the first limiting step abuts against the second limiting step.

[0010] In an optional manner, the liquid-passing hole includes a first hole segment and a second hole segment that are connected to each other, wherein one end of the first hole segment facing away from the second hole segment is connected to the one-way valve, and one end of the second hole segment facing away from the first hole segment is used to connect to the lifting device; wherein, the inner diameter of the first hole segment is smaller than the inner diameter of the second hole segment, and a push surface is formed between the first hole segment and the second hole segment, and the fluid input into the liquid-passing hole can apply a thrust to the push surface to drive the piston to move toward the direction of the one-way valve.

[0011] In an optional manner, the liquid discharge device further includes a sand discharge assembly, which is disposed in the accommodating chamber and on a side of the one-way valve away from the piston, and is used to stir the fluid in the accommodating chamber.

[0012] In an optional manner, the sand removal component includes a spiral blade, which is rotatably disposed in the accommodating chamber; in the second state, the fluid in the accommodating chamber can drive the spiral blade to rotate, so that the spiral blade stirs the fluid in the accommodating chamber.

[0013] In an optional manner, the sand removal assembly also includes a spiral blade, a driving member and an energy accumulator, and the driving member is respectively connected to the energy accumulator and the spiral blade; in the first state, the fluid in the accommodating chamber can drive the spiral blade to rotate, so that the spiral blade charges the energy accumulator through the driving member; in the third state, the lifting device stops inputting fluid into the liquid hole, the piston moves to the second position, and the energy accumulator can power the driving member so that the driving member drives the spiral blade to rotate.

[0014] In an optional manner, the sand removal component also includes a fixed sleeve, which is connected to the tube body, and the spiral blade is rotatably connected to the fixed sleeve, and the fixed sleeve is provided with a connecting hole for fluid to pass through, and both ends of the connecting hole are respectively connected to the accommodating cavity; and / or the sand removal component also includes a flange seat, which is respectively connected to the driving member and the tube body; and / or the sand removal component also includes a coupling, which is respectively connected to the driving member and the spiral blade.

[0015] In an optional manner, the liquid discharge device further includes a driving assembly, wherein the driving assembly is connected to the piston, and the driving assembly can drive the piston to move relative to the tube body.

[0016] In an optional manner, the drive assembly includes a piston cylinder, the piston is movably disposed in the piston cylinder, and a first piston chamber is provided between the piston and the piston cylinder; pressure fluid can be input into the first piston chamber to push the piston to move toward the one-way valve.

[0017] In an optional manner, a second piston chamber is further provided between the piston cylinder and the piston, and the second piston chamber is provided on the side of the first piston chamber facing the one-way valve; the drive assembly also includes a pressure pump, and the pressure pump is connected to the first piston chamber and the second piston chamber respectively; in the first state and the second state, the first piston chamber and the second piston chamber are connected, and when the piston moves in a direction away from the one-way valve, the pressure fluid in the first piston chamber can be discharged; in the fourth state, the lifting device stops inputting fluid into the liquid hole, and the pressure pump inputs pressure fluid into the first piston chamber to push the piston to move in the direction of the one-way valve.

[0018] According to another aspect of the present application, a liquid displacement pump is provided, comprising a pump body and the liquid displacement device as described above, wherein the liquid displacement device is connected to the pump body.

[0019] According to another aspect of the present application, there is provided a coalbed methane mining device, comprising a lifting device and the drainage device as described above, wherein the drainage device is connected to the lifting device.

[0020] The beneficial effects of the embodiment of the present application are as follows: Different from the prior art, the embodiment of the present application is provided with a tube body, a piston and a one-way valve. Among them, the interior of the tube body is provided with a accommodating chamber and a liquid outlet connected to the accommodating chamber, the peripheral wall of the tube body is provided with a drainage hole, and the drainage hole can connect the accommodating chamber with the outside of the tube body, the piston is movably arranged in the accommodating chamber, and a liquid hole is provided in the piston, and the end of the liquid hole away from the liquid outlet is used to communicate with the lifting device, the one-way valve is arranged in the accommodating chamber, the one-way valve is connected to the end of the piston facing the liquid outlet, the one-way valve is connected to the piston, and the piston can move between a first position and a second position relative to the tube body. When the piston moves to the first position, the drainage hole and the accommodating chamber can be closed, and when the piston moves to the second position, the drainage hole and the accommodating chamber can be connected. In the first state, the lifting device inputs fluid into the direction of the piston, and the fluid pushes the piston to move toward the one-way valve to the first position, and the fluid passes through the liquid hole, the one-way valve, the accommodating chamber in sequence and is discharged from the liquid outlet. In the second state, the lifting device stops inputting fluid into the liquid hole, and the fluid in the accommodating chamber pushes the piston to move in the direction away from the one-way valve to the second position, and the fluid in the accommodating chamber is discharged through the discharge hole. At this time, solid particles in the accommodating chamber can be washed away by the fluid and discharged from the discharge hole when the fluid flows, thereby reducing the deposition of solid particles in the tube body, thereby reducing the blockage of the pump to ensure the normal production of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 This is a schematic diagram of a use state of the liquid discharge device according to an embodiment of the present application;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure enlargement in the middle;

[0024] Figure 3 is a schematic diagram of another use state of the liquid discharge device according to an embodiment of the present application;

[0025] Figure 4 yes Figure 3 Enlarged schematic diagram of the structure at point B in the middle. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] It should be noted that: in the present application, the liquid discharge device 1000 is used to be connected to the lifting device 2000, and the lifting device 2000 is used to lift the liquid in the well to the ground, and the liquid lifted by the lifting device 2000 can flow to a preset position through the liquid discharge device 1000. The lifting device 2000 includes but is not limited to a screw pump, a centrifugal pump, a gear pump, a reciprocating pump, etc.

[0030] See also Figure 1 and Figure 2 The liquid discharge device 1000 includes a tube body 10, a piston 20 and a one-way valve 30. The piston 20 is movably disposed in the tube body 10, and the one-way valve 30 is disposed in the tube body 10. The one-way valve 30 is connected to one end of the piston 20 facing the liquid outlet 10b of the tube body 10, and one end of the tube body 10 away from the liquid outlet 10b is connected to the lifting device 2000, and the one-way valve 30 is communicated with the piston 20. The fluid input into the tube body 10 by the lifting device 2000 can flow through the piston 20 and the one-way valve 30 and be discharged from the liquid outlet 10b of the tube body 10.

[0031] For the above-mentioned tube body 10, if Figure 1 As shown, a accommodating cavity 10a is provided inside the tube body 10, a liquid outlet 10b connected to the accommodating cavity 10a is provided at one end of the tube body 10, and the other end of the tube body 10 is used to connect with the lifting device 2000. The peripheral wall of the tube body 10 is also provided with a drainage hole 10c, which can connect the accommodating cavity 10a with the outside of the tube body 10.

[0032] Specifically, the pipe body 10 includes a first connecting pipe 101, a second connecting pipe 102 and a third connecting pipe 103, one end of the second connecting pipe 102 is detachably connected to the first connecting pipe 101, the other end of the second connecting pipe 102 is detachably connected to the third connecting pipe 103, and the second connecting pipe 102 is located between the first connecting pipe 101 and the third connecting pipe 103. The lifting device 2000 is at least partially located in the third connecting pipe 103. In some embodiments, the drain hole 10c is located on the second connecting pipe 102.

[0033] In some embodiments, the accommodating chamber 10a includes a first chamber section 101a and a second chamber section 102a that are connected to each other. The end of the first chamber section 101a that is away from the second chamber section 102a is connected to the liquid outlet 10b, and the second chamber section 102a is connected to the liquid discharge hole 10c. Part of the piston 20 can move between the first chamber section 101a and the second chamber section 102a. In some embodiments, the first chamber section 101a is located in the first connecting tube 101, and the second chamber section 102a is located in the second connecting tube 102.

[0034] For the one-way valve 30, Figure 1-Figure 3 As shown, the one-way valve 30 is arranged in the accommodating chamber 10a, and the one-way valve 30 is connected to one end of the piston 20 facing the liquid outlet 10b, and the one-way valve 30 and the piston 20 are internally connected. The one-way valve 30 includes a valve housing 301, an elastic member 302 and a valve flap 303. The valve housing 301 is connected to the piston 20, and the valve housing 301 is provided with a mounting chamber 301a and a liquid flow port 301b connected to the mounting chamber 301a. The interior of the piston 20 is connected to the accommodating chamber 10a through the liquid flow port 301b. One end of the elastic member 302 is connected to the bottom of the mounting chamber 301a, and the other end of the elastic member 302 is connected to the valve flap 303. When the lifting device 2000 moves toward the piston 20, the one-way valve 301a is connected to the piston 20. After the fluid is input from the direction of the plug 20, the fluid pushes the valve flap 303 to compress the elastic member 302, and the valve flap 303 no longer blocks the liquid flow port 301b. At this time, the fluid can flow into the accommodating chamber 10a through the liquid flow port 301b and be discharged from the liquid outlet 10b. After the lifting device 2000 stops moving, the valve flap 303 rebounds to its initial state under the action of the rebound force of the elastic member 302, and the valve flap 303 blocks the liquid flow port 301b. At this time, the inside of the piston 20 is not connected to the accommodating chamber 10a.

[0035] For the above piston 20, if Figure 1 and Figure 2As shown, the piston 20 is movably disposed in the accommodating chamber 10a, and a liquid hole 20a is provided in the piston 20. The end of the liquid hole 20a away from the liquid outlet 10b is used to communicate with the lifting device 2000, and the liquid hole 20a is connected with the accommodating chamber 10a through the liquid flow port 301b. The piston 20 can move between a first position and a second position relative to the tube body 10. When the piston 20 moves to the first position, the drainage hole 10c and the accommodating chamber 10a can be closed. At this time, the fluid can be normally circulated in the accommodating chamber 10a to the liquid outlet 10b for discharge. When the piston 20 moves to the second position, the drainage hole 10c and the accommodating chamber 10a can be connected. The solid particles in the accommodating chamber 10a can be washed away by the fluid and discharged from the drainage hole 10c when the fluid flows, thereby reducing the deposition of solid particles in the tube body 10.

[0036] Please also refer to Figure 3 and Figure 4 In the first state, the lifting device 2000 inputs fluid into the liquid hole 20a, and the fluid pushes the piston 20 to move to the first position in the direction of the one-way valve 30. The fluid passes through the liquid hole 20a, the one-way valve 30, the accommodating chamber 10a in sequence and is discharged from the liquid outlet 10b. It can be understood that the flow direction of the fluid input by the lifting device 2000 is from bottom to top, so that the fluid pushes the piston 20 to move upward a preset distance to reach the first position. The specific data of the preset distance can be set by the user according to actual needs and is not specifically limited in this application. In addition, it should be noted that the first state refers to the state in which the discharge device 1000 discharges normally.

[0037] In the second state, if Figure 1 and Figure 2 As shown, the lifting device 2000 stops inputting fluid into the fluid hole 20a, and the fluid in the accommodating chamber 10a pushes the piston 20 to move to the second position in the direction away from the one-way valve 30, and the fluid in the accommodating chamber 10a is discharged through the drainage hole 10c. After the lifting device 2000 stops inputting fluid into the fluid hole 20a, there is still fluid in the accommodating chamber 10a. At this time, the fluid flows from top to bottom under the action of gravity, thereby pushing the piston 20 to move downward by a preset distance to reach the second position. Since the one-way valve 30 is in a closed state, the fluid flowing downward can only flow out from the drainage hole 10c. The solid particles in the accommodating chamber 10a can be washed away by the fluid and discharged from the drainage hole 10c when the fluid flows downward, thereby reducing the deposition of solid particles in the tube body 10. It should be noted that the second state refers to the state in which the drainage device 1000 is in the state of discharging sand (solid particles).

[0038] In some embodiments, the piston 20 includes a first piston segment 201 and a second piston segment 202 connected to each other, and the end of the first piston segment 201 facing away from the second piston segment 202 is connected to the one-way valve 30. A liquid gap 201a is provided between the outer peripheral wall of the first piston segment 201 and the inner cavity wall of the accommodating chamber 10a, and the outer peripheral wall of the second piston segment 202 abuts against the inner cavity wall of the accommodating chamber 10a. When the piston 20 moves to the first position, the second piston segment 202 can close the drainage hole 10c. When the piston 20 moves to the second position, the liquid gap 201a can connect the accommodating chamber 10a and the drainage hole 10c. The solid particles located in the accommodating chamber 10a can flow through the liquid gap 201a and be discharged from the drainage hole 10c when the fluid flows downward. Among them, the first piston segment 201 can play the role of connecting the one-way valve 30, and a liquid gap 201a is formed between the outer wall of the first piston segment 201 and the inner wall of the accommodating chamber 10a. The liquid gap 201a can facilitate the liquid or fixed particles or solid-liquid mixture in the accommodating chamber 10a to flow to the drainage hole 10c for discharge, and the second piston segment 202 can play the role of blocking the drainage hole 10c.

[0039] In some embodiments, the first piston segment 201 can move between the first cavity segment 101a and the second cavity segment 102a, and the second piston segment 202 can be movably disposed in the second cavity segment 102a. When the piston 20 moves to the first position, the first piston segment 201 is disposed in the first cavity segment 101a, and the second piston segment 202 closes the drainage hole 10c. When the piston 20 moves to the second position, the first piston segment 201 is at least partially disposed in the second cavity segment 102a, and the liquid gap 201a can connect the accommodating cavity 10a and the drainage hole 10c. Wherein, the first cavity segment 101a is located above the second cavity segment 102a. When the piston 20 moves to the first position, at this time, the piston 20 moves from bottom to top, and the first piston segment 201 moves from the second cavity segment 102a to the first cavity segment 101a until the first piston segment 201 is located in the first cavity segment 101a, and at this time, the second piston segment 202 closes the drainage hole 10c.

[0040] In some embodiments, the piston 20 further includes a third piston segment 203, the third piston segment 203 is connected between the first piston segment 201 and the second piston segment 202, and a liquid gap 201a is provided between the first piston segment 201 and the first cavity segment 101a. When the piston 20 moves to the first position, the third piston segment 203 is arranged in the first cavity segment 101a, so that the liquid gap 201a is not connected to the drainage hole 10c. When the piston 20 moves to the second position, the third piston segment 203 is arranged in the second cavity segment 102a, so that the liquid gap 201a is connected to the drainage hole 10c. 203 is located between the first piston section 201 and the second piston section 202. When the piston 20 moves to the first position, the piston 20 moves from bottom to top, and the third piston section 203 moves into the first cavity section 101a and abuts against the inner wall of the first cavity section 101a. At this time, the liquid gap 201a is disconnected from the drainage hole 10c. When the piston 20 moves to the second position, the piston 20 moves from top to bottom, and the third piston section 203 moves into the second cavity section 102a. The third piston section 203 no longer abuts against the inner wall of the first cavity section 101a. At this time, the liquid gap 201a and the drainage hole 10c are in a connected state.

[0041] In some embodiments, a first sealing ring 2021 is provided between the second piston segment 202 and the second chamber segment 102a, and the first sealing ring 2021 is provided on the side of the drainage hole 10c away from the one-way valve 30. The first sealing ring 2021 can ensure the tightness between the second piston segment 202 and the inner wall of the second chamber segment 102a, and reduce the flow of the fluid flowing to the drainage hole 10c into the second chamber segment 102a. It can be understood that in some other embodiments, the first sealing ring 2021 can also be omitted, and the second piston segment 202 directly abuts against the second chamber segment 102a.

[0042] In some embodiments, the outer sleeve of the third piston section 203 is provided with a second sealing ring 2031. When the piston 20 moves to the first position, the second sealing ring 2031 abuts against the inner wall of the first cavity section 101a. The second sealing ring 2031 can ensure the tightness between the third piston section 203 and the inner wall of the first cavity section 101a. When the piston 20 moves to the first position, the second sealing ring 2031 can reduce the leakage of the liquid gap 201a to ensure that the fluid in the liquid discharge device 1000 can flow normally to the liquid outlet 10b. It can be understood that in some other embodiments, the second sealing ring 2031 can also be omitted. When the piston 20 moves to the first position, the third piston section 203 directly abuts against the inner wall of the first cavity section 101a.

[0043] In some embodiments, a first limiting step 2022 is provided at one end of the second piston section 202 facing the first piston section 201, and a second limiting step 1011 is provided between the first cavity section 101a and the second cavity section 102a. When the piston 20 moves to the first position, the first limiting step 2022 abuts against the second limiting step 1011. In particular, since the flow direction of the fluid input by the lifting device 2000 is from bottom to top, the fluid pushes the piston 20 to move upward by a preset distance to reach the first position. To ensure that the piston 20 can accurately reach the first position, when the piston 20 moves to the first position, the first limiting step 2022 abuts against the second limiting step 1011, and the piston 20 is limited and cannot continue to move upward, thereby ensuring that the piston 20 can accurately reach the first position. In some embodiments, the second limiting step 1011 is located at one end of the first connecting pipe 101 close to the second connecting pipe 102, and the second limiting step 1011 is located close to the connection between the first connecting pipe 101 and the second connecting pipe 102.

[0044] In some embodiments, the liquid hole 20a includes a first hole segment 20aa and a second hole segment 20ab that are connected to each other. The end of the first hole segment 20aa away from the second hole segment 20ab is connected to the one-way valve 30, and the end of the second hole segment 20ab away from the first hole segment 20aa is used to communicate with the lifting device 2000. The fluid input by the lifting device 2000 can flow through the second hole segment 20ab and the first hole segment 20aa in sequence.

[0045] In some embodiments, the inner diameter of the first hole segment 20aa is smaller than the inner diameter of the second hole segment 20ab, and a push surface 20ac is formed between the first hole segment 20aa and the second hole segment 20ab. The fluid input into the liquid hole 20a can apply a thrust to the push surface 20ac to drive the piston 20 to move toward the direction of the one-way valve 30. The fluid input into the lifting device 2000 flows through the second hole segment 20ab, the push surface 20ac and the first hole segment 20aa in sequence, and the input fluid applies a thrust to the push surface 20ac to ensure that the piston 20 can move to the first position in the direction of the one-way valve 30 in the first state. It can be understood that the driving force that enables the piston 20 to move in the direction of the one-way valve 30 includes but is not limited to fluid driving force, hydraulic driving force, pneumatic driving force, spring force, motor driving force, electromagnetic force, etc.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the liquid discharge device 1000 further includes a sand discharge assembly 40, which is disposed in the accommodating chamber 10a and on the side of the one-way valve 30 away from the piston 20, and is used to stir the fluid in the accommodating chamber 10a.

[0047] In some embodiments, the sand discharge component 40 includes a spiral blade 401, which is rotatably disposed in the accommodating chamber 10a. In the first state, the lifting device 2000 inputs fluid into the liquid hole 20a, and the fluid passes through the liquid hole 20a, the one-way valve 30, the accommodating chamber 10a, the spiral blade 401 in sequence, and is discharged from the liquid outlet 10b. The fluid can increase the upward flow rate under the rotation of the spiral blade 401, thereby improving the discharge efficiency of the discharge device 1000. In the second state, the fluid in the accommodating chamber 10a can be brought to the bottom of the liquid discharge port 10b. The movable spiral blade 401 rotates so that the spiral blade 401 stirs the fluid in the accommodating chamber 10a. At this time, the rotation direction of the spiral blade 401 in the second state is opposite to the rotation direction of the spiral blade 401 in the first state. In the second state, the fluid in the accommodating chamber 10a moves from top to bottom and drives the spiral blade 401 to rotate. The spiral blade 401 increases the downward flow rate of the liquid and solid particles to reduce the accumulation of solid particles in the fluid, while ensuring that the liquid and solid particles in the accommodating chamber 10a can be discharged from the drainage hole 10c.

[0048] In some embodiments, the sand removal assembly 40 further includes a driving member 402 and an energy storage device 403. The driving member 402 is connected to the energy storage device 403 and the spiral blade 401, respectively. In the first state, the fluid in the accommodating chamber 10a can drive the spiral blade 401 to rotate, so that the spiral blade 401 charges the energy storage device 403 through the driving member 402, and the electric energy stored in the energy storage device 403 is prepared for subsequent use, for example, the energy storage device 403 provides electricity to rotate the spiral blade 401. In the third state, the lifting device 2000 stops inputting fluid into the liquid hole 20a, the piston 20 moves to the second position, and the energy storage device 403 can supply power to the driving member 402, so that the driving member 402 drives the spiral blade 401 to rotate. It should be noted that the third state refers to a state in which the current in the drainage device 1000 increases significantly, it is difficult for the drainage device 1000 to drain upward, and a blockage occurs in the tube body 10. In this state, the spiral blade 401 is required to actively discharge sand, wherein the electric energy stored in the energy storage device 403 can power the driving member 402, so that the driving member 402 drives the spiral blade 401 to rotate, thereby realizing the active sand discharge of the drainage device 1000.

[0049] In some embodiments, the sand removal assembly 40 further includes a fixed sleeve 404, which is connected to the pipe body 10, and the spiral blade 401 is rotatably connected to the fixed sleeve 404, and the fixed sleeve 404 is provided with a connecting hole 404a for fluid to pass through, and the two ends of the connecting hole 404a are respectively connected to the accommodating chamber 10a, and the fixed sleeve 404 can limit and fix the spiral blade in the accommodating chamber 10a, and the connecting hole 404a on the fixed sleeve 404 can allow the fluid flowing from bottom to top to pass through and flow to the liquid outlet 10b, and the connecting hole 404a can allow the fluid flowing from top to bottom to pass through and flow to the liquid discharge hole 10c. In some embodiments, the number of fixed sleeves 404 is two, and the two fixed sleeves 404 are respectively connected to the two ends of the spiral blade 401, and the spiral blade 401 is located between the two fixed sleeves 404. It can be understood that in some other embodiments, the fixed sleeve 404 can be omitted, and the two ends of the spiral blade 401 are directly rotatably connected to the pipe body 10.

[0050] In some embodiments, the sand removal assembly 40 also includes a limit retaining ring 405, which is arranged on the inner wall of the pipe body 10, and the limit retaining ring 405 is located on the side of the fixed sleeve 404 away from the one-way valve 30. The limit retaining ring 405 can limit and block the fixed sleeve 404, reduce the axial displacement of the fixed sleeve 404, and at the same time, facilitate the installation and fixation of the fixed sleeve 404 at a preset position, thereby improving the installation efficiency of the fixed sleeve 404.

[0051] In some embodiments, the sand removal assembly 40 further includes a flange seat 406, which is respectively connected to the driving member 402 and the pipe body 10. The flange seat 406 can realize the relative fixation of the driving member 402 in the pipe body 10. At the same time, the flange seat 406 can cover and protect the driving member 402, thereby reducing the damage to the driving member 402 caused by the fluid. The flange seat 406 includes an upper cover 4061, a lower cover 4062, and a connecting screw 4063. The upper cover 4061 is covered on the lower cover 4062. An installation space (not marked) is provided between the upper cover 4061 and the lower cover 4062. The driving member 402 is located in the installation space. The connecting screw 4063 passes through the upper cover 4061 and the lower cover 4062 and is screwed to the pipe body 10. Among them, the flange seat 406 is provided with a liquid port 406a, which is connected to the accommodating chamber 10a. The fluid in the accommodating chamber 10a can flow from the liquid port 406a to the liquid outlet 10b. It is understandable that in some other embodiments, the flange seat 406 may be omitted, and the driving member 402 may be relatively fixed in the tube body 10 in other ways.

[0052] In some embodiments, the sand removal assembly 40 further includes a coupling 407, which connects the driving member 402 and the spiral blade 401 respectively, and the coupling 407 can realize the connection between the driving member 402 and the spiral blade 401, so that the driving member 402 can drive the spiral blade 401 to rotate. It can be understood that in some other embodiments, the coupling 407 can be omitted, and the driving member 402 and the spiral blade 401 can be directly connected or connected in other ways, such as: belt drive, gear drive, chain drive, etc.

[0053] In the above embodiment, the fluid input by the lifting device 2000 drives the piston 20 to move in the tube body 10, and the driving force of the piston 20 in the tube body 10 mainly relies on the driving force of the fluid. Figure 1 and Figure 2 As shown, the liquid discharge device 1000 further includes a drive assembly 50, which is connected to the piston 20 and can drive the piston 20 to move relative to the tube body 10. The drive assembly 50 is used to drive the piston 20 to move relative to the tube body 10. It can be understood that the driving principle of the drive assembly 50 includes but is not limited to hydraulic drive, pneumatic drive, spring force, motor drive, etc.

[0054] In some embodiments, the driving assembly 50 includes a piston cylinder 501, the piston 20 is movably disposed in the piston cylinder 501, a first piston chamber 501a is provided between the piston 20 and the piston cylinder 501, and a pressure fluid can be input into the first piston chamber 501a to push the piston 20 to move toward the one-way valve 30. By inputting a pressure fluid into the first piston chamber 501a, the piston 20 can also be pushed to move toward the one-way valve 30.

[0055] In some embodiments, a second piston chamber 501b is further provided between the piston cylinder 501 and the piston 20, and the second piston chamber 501b is provided on the side of the first piston chamber 501a facing the one-way valve 30. The driving assembly 50 further includes a pressure pump (not shown), which is connected to the first piston chamber 501a and the second piston chamber 501b respectively, and pressure fluid can be input into the first piston chamber 501a or the second piston chamber 501b respectively through the pressure pump to push the piston 20 to move upward or downward relative to the piston cylinder 501. In the first state and the second state, the first piston chamber 501a and the second piston chamber 501b are connected, and when the piston 20 moves in the direction away from the one-way valve 30, the pressure fluid in the first piston chamber 501a can be discharged.

[0056] In some embodiments, in the fourth state, the lifting device 2000 stops inputting fluid into the liquid passage hole 20a, and the pressure pump inputs pressure fluid into the first piston chamber 501a to push the piston 20 to move toward the one-way valve 30. It should be noted that the fourth state refers to the state in which the operating current in the discharge device 1000 is low and the channel between the discharge hole 10c and the liquid passage gap 201a is blocked. At this time, the third piston segment 203 cannot enter the first chamber segment 101a under normal fluid driving force, and it is necessary to input pressure fluid into the first piston chamber 501a with the help of the pressure pump, and use the pressure fluid to push the piston 20 to move toward the one-way valve 30, so as to squeeze the solid particles in the channel between the discharge hole 10c and the liquid passage gap 201a to be discharged to the discharge hole 10c until the third piston segment 203 enters the first chamber segment 101a. It can be understood that, in some embodiments, a position sensor or a displacement sensor is also provided in the piston cylinder 501, and the position sensor or the displacement sensor is connected to the piston 20. The position sensor can be used to monitor whether the third piston segment 203 on the piston 20 enters the first cavity segment 101a, and the displacement sensor is used to monitor the movement distance of the piston 20. The user can judge whether the third piston segment 203 enters the first cavity segment 101a based on this.

[0057] In some embodiments, a support seat 5011 is further provided on the side of the piston cylinder 501 away from the one-way valve 30, and the support seat 5011 and the tube body 10 are relatively fixed. The lifting device 2000 is located on the side of the support seat 5011 away from the piston cylinder 501, and a third sealing ring 5011a is provided between the peripheral wall of the support seat 5011 and the tube body 10, and a fourth sealing ring 5011b is also provided between the piston cylinder 501 and the support seat 5011. The third sealing ring 5011a can reduce the fluid from entering the second connecting tube 102 in the axial direction, and the fourth sealing ring 5011b can reduce the fluid from entering the second connecting tube 102 in the radial direction.

[0058] In the embodiment of the present application, a tube body 10, a piston 20 and a one-way valve 30 are provided. The tube body 10 is provided with a receiving chamber 10a and a liquid outlet 10b connected to the receiving chamber 10a, and a drainage hole 10c is provided on the peripheral wall of the tube body 10. The drainage hole 10c can connect the receiving chamber 10a with the outside of the tube body 10. The piston 20 is movably arranged in the receiving chamber 10a. A liquid hole 20a is provided in the piston 20. The end of the liquid hole 20a away from the liquid outlet 10b is used to communicate with the lifting device 2000. The one-way valve 30 is arranged in the receiving chamber 10a. The one-way valve 30 is connected to the end of the piston 20 facing the liquid outlet 10b. The one-way valve 30 is connected to the piston 20. The piston 20 can move between a first position and a second position relative to the tube body 10. When the piston 20 moves to the first position, the drainage hole 10c and the receiving chamber 10a can be closed. When the piston 20 moves to the second position, the drainage hole 10c can be closed. The hole 10c is connected to the accommodating chamber 10a. In the first state, the lifting device 2000 inputs fluid into the direction of the piston 20, and the fluid pushes the piston 20 to move to the first position in the direction of the one-way valve 30. The fluid passes through the liquid hole 20a, the one-way valve 30, and the accommodating chamber 10a in sequence and is discharged from the liquid outlet 10b. In the second state, the lifting device 2000 stops inputting fluid into the liquid hole 20a, and the fluid in the accommodating chamber 10a pushes the piston 20 to move to the second position away from the one-way valve 30, and the fluid in the accommodating chamber 10a is discharged through the drainage hole 10c. At this time, the solid particles in the accommodating chamber 10a can be washed away by the fluid and discharged from the drainage hole 10c when the fluid flows, thereby reducing the deposition of solid particles in the tube body 10, thereby reducing the blockage of the pump to ensure the normal production of the pump.

[0059] The present application also provides an embodiment of a liquid displacement pump, which includes a pump body and the liquid displacement device 1000 as described above, wherein the liquid displacement device 1000 is connected to the pump body. The function and structure of the liquid displacement device 1000 can be referred to the above embodiment, and will not be described one by one here.

[0060] The present application also provides an embodiment of a coalbed methane extraction device, which includes a lifting device 2000 and a drainage device 1000 as described above, wherein the drainage device 1000 is connected to the lifting device 2000. The function and structure of the drainage device 1000 can be referred to the above embodiment, and will not be described one by one here.

[0061] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A liquid discharge device, used to be connected to a lifting device, characterized in that: include: A tube body, wherein a receiving cavity is provided inside the tube body, a liquid outlet is provided at one end of the tube body and is connected to the receiving cavity, and the other end of the tube body is used to be connected to the lifting device, and a liquid discharge hole is also provided on the peripheral wall of the tube body, and the liquid discharge hole can connect the receiving cavity with the outside of the tube body; A piston, the piston is movably disposed in the accommodating chamber, a liquid passage hole is provided in the piston, and an end of the liquid passage hole away from the liquid outlet is used to communicate with the lifting device; A one-way valve, the one-way valve is arranged in the accommodating chamber, the one-way valve is connected to one end of the piston facing the liquid outlet, and the one-way valve is communicated with the liquid hole; The liquid passage hole comprises a first hole section and a second hole section which are connected to each other, wherein one end of the first hole section which is away from the second hole section is connected to the one-way valve, and one end of the second hole section which is away from the first hole section is used to be connected to the lifting device; The inner diameter of the first hole segment is smaller than the inner diameter of the second hole segment, a push surface is formed between the first hole segment and the second hole segment, and the fluid input into the liquid hole can apply a thrust to the push surface to drive the piston to move toward the one-way valve; The piston can move between a first position and a second position relative to the tube body. When the piston moves to the first position, the drainage hole and the accommodating chamber are closed. When the piston moves to the second position, the drainage hole and the accommodating chamber are connected. In the first state, the lifting device inputs fluid into the liquid hole, and the fluid pushes the piston to move toward the one-way valve to the first position, and the fluid sequentially passes through the liquid hole, the one-way valve, the accommodating chamber, and is discharged from the liquid outlet; In the second state, the lifting device stops inputting fluid into the liquid passage hole, the fluid in the accommodating chamber pushes the piston to move to the second position in a direction away from the one-way valve, and the fluid in the accommodating chamber is discharged through the drainage hole.

2. The liquid discharge device according to claim 1, characterized in that: The piston comprises a first piston section and a second piston section connected to each other, and an end of the first piston section facing away from the second piston section is connected to the one-way valve; A liquid gap is provided between the outer peripheral wall of the first piston section and the inner cavity wall of the accommodating cavity, and the outer peripheral wall of the second piston section abuts against the inner cavity wall of the accommodating cavity; When the piston moves to the first position, the second piston section can close the drainage hole; When the piston moves to the second position, the liquid gap can connect the accommodating chamber and the liquid discharge hole.

3. The liquid discharge device according to claim 2, characterized in that: The accommodating cavity comprises a first cavity section and a second cavity section which are connected to each other, wherein one end of the first cavity section which is away from the second cavity section is connected to the liquid outlet, and the second cavity section is connected to the liquid discharge hole; The first piston section is movable between the first cavity section and the second cavity section, and the second piston section is movably disposed in the second cavity section; When the piston moves to the first position, the first piston section is disposed in the first cavity section, and the second piston section closes the drainage hole; When the piston moves to the second position, the first piston section is at least partially disposed in the second cavity section, and the liquid gap can connect the accommodating cavity and the liquid discharge hole.

4. The liquid discharge device according to claim 3, characterized in that: The piston further comprises a third piston segment, the third piston segment is connected between the first piston segment and the second piston segment, and the liquid gap is provided between the first piston segment and the first cavity segment; When the piston moves to the first position, the third piston section is disposed in the first cavity section, so that the liquid gap is not connected to the liquid discharge hole; When the piston moves to the second position, the third piston section is disposed in the second cavity section so that the liquid gap is communicated with the liquid discharge hole.

5. The liquid discharge device according to claim 4, characterized in that: A first sealing ring is provided between the second piston section and the second chamber section, and the first sealing ring is arranged on a side of the drain hole away from the one-way valve; and / or The outer sleeve of the third piston section is provided with a second sealing ring. When the piston moves to the first position, the second sealing ring abuts against the inner cavity wall of the first cavity section.

6. The liquid discharge device according to claim 3, characterized in that: A first limiting step is provided at one end of the second piston segment facing the first piston segment, and a second limiting step is provided between the first cavity segment and the second cavity segment; When the piston moves to the first position, the first limiting step abuts against the second limiting step.

7. The liquid discharge device according to claim 1, characterized in that: The liquid discharge device further comprises a sand discharge assembly, which is arranged in the accommodating chamber and on a side of the one-way valve away from the piston, and is used to stir the fluid in the accommodating chamber.

8. The liquid discharge device according to claim 7, characterized in that: The sand removal assembly includes a spiral blade, and the spiral blade is rotatably disposed in the accommodating chamber; In the second state, the fluid in the accommodating chamber can drive the spiral blade to rotate, so that the spiral blade stirs the fluid in the accommodating chamber.

9. The liquid discharge device according to claim 7, characterized in that: The sand removal assembly further comprises a spiral blade, a driving member and an energy accumulator, wherein the driving member is respectively connected to the energy accumulator and the spiral blade; In the first state, the fluid in the accommodating chamber can drive the spiral blade to rotate, so that the spiral blade charges the energy storage device through the driving member; In the third state, the lifting device stops inputting fluid into the liquid passage hole, the piston moves to the second position, and the energy storage device can supply power to the driving member so that the driving member drives the spiral blade to rotate.

10. The liquid discharge device according to claim 9, characterized in that: The sand removal assembly further comprises a fixing sleeve, the fixing sleeve is connected to the pipe body, and the spiral blade is rotatably connected to the fixing sleeve, the fixing sleeve is provided with a connecting hole for fluid to pass through, and both ends of the connecting hole are respectively connected to the accommodating cavity; and / or The sand removal assembly further comprises a flange seat, wherein the flange seat is respectively connected to the driving member and the pipe body; and / or The sand removal assembly further comprises a coupling, and the coupling is respectively connected to the driving member and the spiral blade.

11. The liquid discharge device according to any one of claims 1-6, 7-10, characterized in that: The liquid discharge device further comprises a driving assembly, wherein the driving assembly is connected to the piston and can drive the piston to move relative to the tube body.

12. The liquid discharge device according to claim 11, characterized in that: The driving assembly comprises a piston cylinder, the piston is movably arranged in the piston cylinder, and a first piston chamber is provided between the piston and the piston cylinder; A pressure fluid can be input into the first piston chamber to push the piston to move toward the one-way valve.

13. The liquid discharge device according to claim 12, characterized in that: A second piston chamber is further provided between the piston cylinder and the piston, and the second piston chamber is provided on a side of the first piston chamber facing the one-way valve; The driving assembly further comprises a pressure pump, wherein the pressure pump is respectively connected to the first piston chamber and the second piston chamber; In the first state and the second state, the first piston chamber is connected to the second piston chamber, and when the piston moves in a direction away from the one-way valve, the pressure fluid in the first piston chamber can be discharged; In the fourth state, the lifting device stops inputting fluid into the liquid passage hole, and the pressure pump inputs pressure fluid into the first piston chamber to push the piston to move toward the one-way valve.

14. A liquid displacement pump, characterized in that: include: Pump body; The liquid discharge device according to any one of claims 1 to 13, wherein the liquid discharge device is connected to the pump body.

15. A coalbed methane mining device, characterized in that: include: Lifting device; The liquid discharge device according to any one of claims 1 to 13, wherein the liquid discharge device is connected to the lifting device.

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