A miniature gas collecting device capable of automatic cut-off

Abstract

This utility model discloses an automatically shut-off micro gas collecting device, belonging to the field of coalbed methane extraction technology. It includes a first main pipeline connected to a pumping station; a second main pipeline connected to the first main pipeline; a rotary valve positioned between the first and second main pipelines; a control mechanism fixedly mounted on the first main pipeline; and a gas collecting tank connected to the second main pipeline. This utility model, through the rotary valve positioned between the first and second main pipelines, can automatically shut off when the gas pressure exceeds a set safety threshold, preventing high-pressure gas from flowing into the gas collecting tank. This solves the technical problem in existing technologies where the gas flow cannot be automatically and quickly shut off when pressure rises sharply during coalbed methane extraction, achieving rapid response to high-pressure gas flow and improving equipment and operational safety.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane extraction, and in particular to a micro gas collection device that can automatically cut off gas flow. Background Technology

[0002] In gas field development, negative pressure extraction technology is widely used in low-pressure, low-production gas wells or coalbed methane wells. By reducing the pressure at the wellhead or downhole, it utilizes the pressure difference to extract natural gas resources from the formation. Coalbed methane, as an important unconventional natural gas resource, also commonly employs negative pressure extraction technology. In this type of gas extraction process, gas gathering devices (such as small gas collection cylinders) need to be installed at specific nodes such as the wellhead, downhole, or surface gathering and transmission pipelines to collect, guide, or meter the produced gas.

[0003] In existing technologies, during the actual operation of coalbed methane (CBM) gathering devices, due to geological factors or engineering limitations, sudden pressure surges may occur during collection, causing the CBM pressure to far exceed the set safety threshold. If the high-pressure gas is not stopped in time, the gathering device may continue to supply high-pressure gas, potentially leading to expansion and explosion, or other safety accidents. For remote and dispersed CBM gathering devices lacking automation systems, the detection and handling of abnormal conditions rely on centralized monitoring and control systems at the well site or in the region to detect anomalies and remotely shut them off. This approach suffers from response delays; for example, information collection and command issuance take time, which is not only inefficient but also poses significant safety hazards and risks of delayed response, impacting operational safety and increasing the risk of accidents. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies that cannot automatically and quickly cut off the gas flow when the pressure rises sharply during coalbed methane extraction, leading to safety hazards and equipment risks. Therefore, this invention proposes a micro gas collection device that can automatically cut off the gas flow.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A micro gas collection device capable of automatic shut-off includes a first main pipeline connected to a pumping station. The second main pipeline is connected to the first main pipeline, and a manual valve is installed on the second main pipeline; A rotary valve is provided between the first main pipeline and the second main pipeline, and the rotary valve is connected to both the first main pipeline and the second main pipeline. A control mechanism is fixedly installed on the first main pipeline and connected to the first main pipeline. The control mechanism is also connected to the rotary valve. A gas collection tank, which is connected to the second main pipeline, is used to collect the gas extracted from the extraction pump station.

[0006] Furthermore, the rotary valve includes: A valve body is fixedly disposed between the first main pipeline and the second main pipeline, and both ends of the valve body are respectively connected to the first main pipeline and the second main pipeline; A valve plate, which is rotatably assembled into the valve body, and the valve plate is a plate-shaped structure adapted to the valve body.

[0007] Furthermore, the valve body is also provided with two sealing rings, which are symmetrically arranged in the valve body and adapted to the valve plate.

[0008] Furthermore, the control mechanism includes: A branch pipe is provided on the first main pipeline and is connected to the first main pipeline. A pressure relief valve is also provided on the branch pipe. A pushing component is disposed on the branch pipe and is connected to the branch pipe; A rotating assembly, one end of which is connected to a rotating valve, and the other end of which is connected to the pushing assembly.

[0009] Furthermore, the actuating component includes: The mounting box is a closed box structure with an internally hollow interior. It is mounted on the branch pipe and is connected to the branch pipe. Two guide posts are also symmetrically arranged inside the mounting box. A push plate is disposed inside the mounting box and is slidably connected to the two guide posts. A sealing plug is also provided at the bottom end of the push plate. A push rod is disposed on the push plate and extends toward the top of the mounting box and through the mounting box. A rack is provided on the push rod. Two elastic elements are disposed between the top of the push plate and the mounting box, and the two elastic elements are respectively covered and disposed outside the two guide posts; The sum of the maximum elastic force of the two elastic elements and the weight of the push plate itself is the same as the set safe air pressure threshold.

[0010] Furthermore, the pushing component also includes two magnetic suction components, which are respectively fixedly disposed on the inner wall of the top of the mounting box and the top of the push plate; Among them, the attraction force of the two magnetic components is less than the elastic force of the two elastic components.

[0011] Furthermore, the rotating assembly includes: Support pipes are fixedly assembled onto the mounting box; A rotating rod is rotatably assembled inside the support pipe. The rotating rod is perpendicular to the push rod. A toothed ring is fixedly installed on the rotating rod. The toothed ring meshes with the rack. When the push rod moves, it can drive the rotating rod to rotate. One end of the rotating rod is fixedly connected to a rotating valve.

[0012] Furthermore, a manual wheel is also provided on the rotating rod.

[0013] The beneficial effects of this utility model are as follows: This application solves the technical problem in the prior art that the gas flow cannot be automatically and quickly cut off when the pressure rises suddenly during coalbed methane mining by installing a rotary valve between the first main pipeline and the second main pipeline. This achieves the technical effect of quickly responding to high-pressure gas flow and improving the safety of equipment and operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a micro gas collection device capable of automatic cut-off provided in an embodiment of this utility model; Figure 2 This is a partial cross-sectional view of a micro gas collection device capable of automatic cutting off provided in an embodiment of the present utility model; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 for Figure 2 Enlarged structural diagram at point B.

[0015] The markings in the diagram are as follows: 1. The first main road; 2. Second main pipeline; 21. Manual valve; 3. Rotate the valve; 31. Valve body; 32. Valve plate; 33. Sealing ring; 4. Control mechanism; 41. Branch pipe; 411. Pressure relief valve; 42. Push assembly; 421. Mounting box; 422. Push plate; 423. Push rod; 424. Elastic element; 425. Magnetic suction element; 43. Rotating assembly; 431. Support pipe; 432. Rotating rod; 433. Manual wheel; 5. Gas collection tank. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Reference Figures 1 to 4 As shown, an automatic shut-off micro gas collection device, in practical applications, is used to cut off the flow of high-pressure gas and prevent the gas collection device from expanding and exploding. It includes a first main pipeline 1, a second main pipeline 2 connected to the first main pipeline 1, a rotary valve 3 disposed between the first main pipeline 1 and the second main pipeline 2, a control mechanism 4 connected to the rotary valve 3, and a gas collection tank 5 connected to the second main pipeline 2.

[0021] Specifically, one end of the first main pipeline 1 is connected to an extraction pumping station. Coalbed methane is extracted into the first main pipeline 1 by the extraction pumping station. For example, the extraction pumping station creates negative pressure to drive the coalbed methane to flow from the coal seam to the surface via the first main pipeline 1. The second main pipeline 2 is connected to the first main pipeline 1. Gas flowing out of the first main pipeline 1 can flow into the second main pipeline 2. A manual valve 21 is also provided on the second main pipeline 2 to allow workers to manually control the flow of gas within it. It should be understood that the connection gaps between the connected components described in this application are all sealed using sealing elements such as gaskets and sealing rings. The rotary valve 3 is located between the first main pipeline 1 and the second main pipeline 2, and is connected to both. When the gas pressure exceeds a set gas pressure safety threshold, the rotary valve 3 controls the flow of gas in the first main pipeline 1. For example, when the rotary valve 3 is closed, it prevents gas in the first main pipeline 1 from flowing into the second main pipeline 2. It should be understood that the gas pressure safety threshold is the maximum pressure value that the gas storage terminal can withstand, which can be set based on databases, historical data, or experimental analysis. The control mechanism 4 is fixedly installed on and connected to the first main pipeline 1. The control mechanism 4 is connected to the rotary valve 3 and is used to control the rotary valve 3. The control mechanism 4 is adapted to the gas pressure in the first main pipeline 1, meaning that the control mechanism 4 can control the opening and closing of the rotary valve 3 according to the gas pressure in the first main pipeline 1. The gas collecting tank 5 is connected to the second main pipeline 2 and is used to collect the gas extracted from the extraction pump station. That is, the gas extracted from the extraction pump flows into the gas collecting tank 5 through the first main pipeline 1 and the second main pipeline 2 for collection. Preferably, the gas collecting tank 5 is made of low-alloy steel and its interior is coated with a metal-ceramic composite coating material to increase the pressure resistance of the gas collecting tank 5 and improve its corrosion resistance.

[0022] For more details, please refer to Figure 4As shown, the rotary valve 3 includes a valve body 31 and a valve plate 32 disposed within the valve body 31. The valve body 31 is a hollow spherical cavity structure. The valve body 31 is fixedly disposed between the first main pipeline 1 and the second main pipeline 2, and both ends of the valve body 31 are respectively connected to the first main pipeline 1 and the second main pipeline 2, meaning that the gas in the first main pipeline 1 must flow into the second main pipeline 2 through the valve body 31. The valve plate 32 is rotatably mounted within the valve body 31. The valve plate 32 is used to control the flow state of the gas between the first main pipeline 1 and the second main pipeline 2. For example, when the valve plate 32 is perpendicular to the first main pipeline 1, the flow channels of the first main pipeline 1 and the second main pipeline 2 are interconnected, so the gas in the first main pipeline 1 can flow into the second main pipeline 2. When the valve plate 32 is parallel to the first main pipeline 1, it blocks the flow channels of the first main pipeline 1 and the second main pipeline 2, and the gas in the first main pipeline 1 no longer flows into the second main pipeline 2. Furthermore, the valve plate 32 is a plate-shaped structure adapted to the valve body 31 to reduce the possibility of leakage when the valve plate 32 blocks the gas.

[0023] In some preferred embodiments, to further improve the sealing performance between the valve body 31 and the valve plate 32, two sealing rings 33 are also provided inside the valve body 31. Both sealing rings 33 are arc-shaped strip structures and are fixedly disposed on the inner wall of the valve body 31. The two sealing rings 33 are symmetrically arranged about the rotation axis of the valve plate 32 and are adapted to the valve plate 32. That is, the two sealing rings 33 are arranged at different heights inside the valve body 31 to avoid obstructing the rotation of the valve plate 32. In other words, when the valve plate 32 is in a state of gas blocking, one sealing ring 33 abuts against the top of the valve body 31, and the other sealing ring 33 abuts against the bottom of the valve body 31, thereby forming a state of complete sealing around the valve body 31 and improving the blocking efficiency of the rotating valve 3.

[0024] Please refer to Figures 2 to 3As shown, in this embodiment, the control mechanism 4 includes a branch pipe 41, a pushing component 42 disposed on the branch pipe 41, and a rotating component 43 adapted to the pushing component 42. The branch pipe 41 is fixedly disposed on the first main pipeline 1, and one end of the branch pipe 41 is connected to the first main pipeline 1, allowing coalbed methane to flow into the branch pipe 41 from the first main pipeline 1. A pressure relief valve 411 is also disposed on the branch pipe 41 to release gas pressure within the branch pipe 41. The pushing component 42 is fixedly disposed on the end of the branch pipe 41 away from the end connected to the first main pipeline 1, and the pushing component 42 is connected to the branch pipe 41, allowing gas in the first main pipeline 1 to flow into the pushing component 42 through the branch pipe 41. One end of the rotating component 43 is connected to a rotating valve 3, and the other end is connected to the pushing component 42; the rotating component 43 is used to control the opening and closing of the rotating valve 3. That is, the pushing component 42 uses the high-pressure gas flowing into the branch pipe 41 as power to drive the rotating component 43 to rotate, thereby closing the rotating valve 3 and blocking the high-pressure gas from flowing into the second main pipeline 2, thus preventing the high-pressure gas from flowing into the gas collecting tank 5.

[0025] Specifically, the pushing assembly 42 includes a mounting box 421, a push plate 422 disposed within the mounting box 421, a push rod 423 connected to the push plate 422, and two elastic elements 424 disposed on the push plate 422. The mounting box 421 is a hollow, sealed box structure, fixedly mounted on the branch pipe 41, with its bottom end connected to the branch pipe 41. Specifically, the bottom end of the mounting box 421 has an air inlet, which connects it to the branch pipe 41, allowing gas from the branch pipe 41 to flow into the mounting box 421. Two guide posts are symmetrically arranged within the mounting box 421. The push plate 422 is disposed within the mounting box 421 and slidably connected to the two guide posts, allowing the push plate 422 to slide along the path of the two guide posts. The bottom end of the push plate 422 is also fixedly provided with a sealing plug adapted to the air inlet. The sealing plug is used to seal the air inlet to reduce the possibility of gas flowing into the mounting box 421 from the branch pipe 41. The push plate 422 is adapted to the mounting box 421, that is, the area of ​​the push plate 422 and the internal cross-section of the mounting box 421 are adapted to reduce the possibility of gas entering the space above the push plate 422 and avoid obstructing the movement of the push plate 422. Preferably, the push plate 422 is made of a rigid alloy material, such as chromium-molybdenum steel or nickel-based alloy, to improve the rigidity and impact resistance of the push plate 422. One end of the push rod 423 is fixedly provided on the push plate 422, and the other end extends towards the top of the mounting box 421 and passes through the mounting box 421. That is, the push rod 423 is slidably connected to the mounting box 421 in a sealed manner. When the push plate 422 moves, it can drive the push rod 423 to move vertically at the same time. Two elastic elements 424 are disposed between the top end of the push plate 422 and the mounting box 421. The two elastic elements 424 apply pressure to the push plate 422, and each elastic element 424 is respectively disposed over the two guide posts to provide support and guidance for the elastic elements 424, reducing the possibility of tilting or jamming. In this embodiment, the elastic element 424 is a spring.The sum of the maximum elastic force of the two elastic elements 424 and the weight of the push plate 422 is the same as the set safe air pressure threshold. That is, when the gas pressure in the first main pipeline 1 is at the safe air pressure threshold, the two elastic elements 424 are at their maximum contraction. For example, when the gas pressure in the first main pipeline 1 rises sharply and the gas pressure is greater than the set safe air pressure threshold, some gas flows into the branch pipe 41. At this time, under the action of the air pressure, the gas pressure on the push plate 422 is converted into a thrust. Since the resultant force of the two elastic elements 424 is less than the gas pressure flowing into the mounting box 421 at this time, the push plate 422 is pushed towards the top of the mounting box 421 under the action of the gas pressure, so that the elastic elements 424 contract and deform, and the push rod 423 moves simultaneously with the push plate 422. After the air pressure in the first main pipeline 1 drops below the set safe threshold, the elastic force of the elastic elements 424 can drive the push plate 422 to reset, so that the push plate 422 moves towards the air inlet and re-closes the branch pipe 41 through the sealing plug.

[0026] Please refer to Figure 3 As shown, in some preferred embodiments, the pushing assembly 42 further includes two magnetic suction members 425, which are respectively fixedly disposed on the inner wall of the top of the mounting box 421 and the top of the push plate 422. The attraction force of the two magnetic suction members 425 is less than the elastic force of the two elastic members 424. For example, when high-pressure gas pushes the push plate 422 to move close to the top of the mounting box 421, the two magnetic suction members 425 attract each other. When the gas pressure drops to a set safe gas pressure threshold, the two magnetic suction members 425 are still attracted to each other, so the two elastic members 424 will not immediately reset. When the gas pressure drops below the set safe threshold, the elastic force of the elastic members 424 can separate the two magnetic suction members 425 to improve the safety of the equipment.

[0027] In this embodiment, the rotating assembly 43 includes a support pipe 431 and a rotating rod 432 disposed within the support pipe 431. Specifically, the support pipe 431 is fixedly assembled onto the mounting box 421 and has a cross-shaped structure. The support pipe 431 is used to protect internal components and improve the service life of the equipment. The rotating rod 432 is rotatably mounted within the support pipe 431. A rotating disk is fixedly mounted on the rotating rod 432, and a turntable bearing adapted to the rotating disk is mounted on the support pipe 431. The rotating rod 432 rotates within the support pipe 431 through the cooperation of the rotating disk and the turntable bearing. The rotating rod 432 is perpendicular to and adapted to the push rod 423. A toothed ring is fixedly mounted on the rotating rod 432, and a rack adapted to the toothed ring is fixedly mounted on the push rod 423. The toothed ring and rack mesh, causing the rotating rod 432 to rotate as the push rod 423 moves. Furthermore, one end of the rotating rod 432 is fixedly connected to the rotary valve 3. The end of the rotating rod 432 near the valve body 31 extends into the valve body 31 and is fixedly connected to the valve plate 32. Rotating the rotating rod 432 causes the valve plate 32 to rotate. In this embodiment, when the gas pressure in the first main pipeline 1 suddenly rises and exceeds the set safe gas pressure threshold, the gas flows into the mounting box 421 through the branch pipe 41 and pushes the push plate 422, thereby causing the push rod 423 to move with the push plate 422. This causes the rotating rod 432 to rotate under the action of the gear ring and the rack, which in turn drives the valve plate 32 to rotate, blocking the flow of gas in the first main pipeline 1. The pressure is continuously released through the pressure relief valve 411. When the gas pressure in the first main pipeline 1 drops below the set safe threshold, the elastic force of the elastic element 424 can drive the push plate 422 to reset, thereby causing the valve plate 32 to rotate again, reconnecting the first main pipeline 1 and the second main pipeline 2, and allowing the extracted gas to flow into the gas collection tank 5.

[0028] In some preferred embodiments, a manual wheel 433 is also fixedly installed on the rotating rod 432. The manual wheel 433 is located on the rotating rod 432 away from the end connected to the rotating valve 3. The rotating rod 432 is driven to rotate by the operator rotating the manual wheel 433, so as to prevent the rotation of the rotating rod 432 from being hindered due to mechanical failure of various components, thereby improving the safety of the equipment.

[0029] In some preferred embodiments, a pressure detector is also provided on the first main pipeline 1. The pressure detector is used to detect the gas pressure in the first main pipeline 1. For example, the pressure detector is an electronic pressure sensor, which consists of a pressure-sensitive element, a signal circuit, and a data output unit. The electronic pressure sensor converts the pressure into an electrical signal through the pressure-sensitive element and outputs a standard signal through the data transmission unit so that the operator can perform the detection.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A micro gas collection device capable of automatically cutting off gas flow, characterized in that, include: The first main pipeline (1) is connected to the extraction pumping station; The second main pipeline (2) is connected to the first main pipeline (1), and a manual valve (21) is provided on the second main pipeline (2). Rotate valve (3), which is located between the first main pipeline (1) and the second main pipeline (2), and is connected to the first main pipeline (1) and the second main pipeline (2); The control mechanism (4) is fixedly installed on the first main pipeline (1) and connected to the first main pipeline (1). The control mechanism (4) is connected to the rotary valve (3). Gas collection tank (5), which is connected to the second main pipeline (2), is used to collect gas extracted from the extraction pump station.

2. The automatically cut-off micro gas collection device according to claim 1, characterized in that, The rotary valve (3) includes: Valve body (31), the valve body (31) is fixedly disposed between the first main pipeline (1) and the second main pipeline (2), and the two ends of the valve body (31) are respectively connected to the first main pipeline (1) and the second main pipeline (2); Valve plate (32), which is rotatably assembled inside the valve body (31), and the valve plate (32) is a plate-shaped structure adapted to the valve body (31).

3. The automatically shut-off micro gas collection device according to claim 2, characterized in that, The valve body (31) is also provided with two sealing rings (33). The two sealing rings (33) are symmetrically arranged in the valve body (31) and are adapted to the valve plate (32).

4. The automatically cut-off micro gas collection device according to claim 1, characterized in that, The control mechanism (4) includes: Branch pipe (41), the branch pipe (41) is provided on the first main pipeline (1), and the branch pipe (41) is connected to the first main pipeline (1). A pressure relief valve (411) is also provided on the branch pipe (41). A push component (42) is disposed on the branch pipe (41) and is connected to the branch pipe (41); Rotating assembly (43), one end of which is connected to the rotating valve (3) and the other end of which is connected to the pushing assembly (42).

5. The automatically shut-off micro gas collection device according to claim 4, characterized in that, The actuating component (42) includes: Mounting box (421), the mounting box (421) is a closed box structure with an internal hollow structure, which is set on the branch pipe (41) and the mounting box (421) is connected to the branch pipe (41). Two guide posts are also symmetrically arranged inside the mounting box (421). Push plate (422), the push plate (422) is disposed in the mounting box (421), and the push plate (422) is slidably connected to the two guide posts. The bottom end of the push plate (422) is also provided with a sealing plug. A push rod (423) is disposed on the push plate (422), and the push rod (423) extends toward the top of the mounting box (421) and passes through the mounting box (421). A rack is provided on the push rod (423). Two elastic elements (424) are disposed between the top of the push plate (422) and the mounting box (421), and the two elastic elements (424) are respectively disposed over the two guide posts; Among them, the sum of the maximum elastic force of the two elastic elements (424) and the weight of the push plate (422) is the same as the set safe air pressure threshold.

6. The automatically cut-off micro gas collection device according to claim 5, characterized in that, The pushing assembly (42) also includes two magnetic suction components (425), which are respectively fixedly disposed on the inner wall of the top of the mounting box (421) and the top of the push plate (422); Among them, the attraction force of the two magnetic elements (425) is less than the elastic force of the two elastic elements (424).

7. The automatically shut-off micro gas collection device according to claim 5, characterized in that, The rotating assembly (43) includes: Support pipe (431), the support pipe (431) is fixedly assembled on the mounting box (421); Rotating rod (432), the rotating rod (432) is rotatably assembled in the supporting pipe (431), the rotating rod (432) is perpendicular to the push rod (423), a toothed ring is fixedly provided on the rotating rod (432), the toothed ring meshes with the rack, and the rotating rod (432) can be driven to rotate when the push rod (423) moves. One end of the rotating rod (432) is fixedly connected to the rotating valve (3).

8. The automatically shut-off micro gas collection device according to claim 7, characterized in that, The rotating rod (432) is also equipped with a manual wheel (433).

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