Coal seam gas sampling device

Abstract

A coal seam gas sampling device, comprising: a gas extraction pipe for extracting gas, the gas extraction pipe is provided with a gas outlet pipe on the side wall; an air inlet head detachably connected to the bottom of the gas extraction pipe; a joint mechanism slidably connected to the side wall of the air inlet head; a gas extraction mechanism slidably connected to the inner wall of the gas extraction pipe; an auxiliary mechanism provided at the bottom of the gas extraction mechanism, the auxiliary mechanism comprising a suction fan; and a gas collection bag detachably connected to the gas outlet pipe. When sampling, the air inlet head is pushed downward, so that the valve ball moves upward, thereby forming a gap between the valve ball and the opening, at this time the collected gas can enter the gas extraction pipe through the gap. When the sampling is completed, the gas extraction pipe is pulled upward, so that the conical pipe also moves upward, at this time the valve rod is separated from the opening, and the valve ball is re-sealed due to gravity. The output end of the motor is fixedly connected with the suction fan, and the motor drives the suction fan to rotate after starting, thereby accelerating the speed of the airflow and improving the speed of gas collection.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and more specifically, to a coal seam gas sampling device. Background Technology

[0002] Methane gas is a mixture of gases, including methane, carbon dioxide, and nitrogen, that escape from coal and surrounding rocks. Currently, when sampling methane gas in coal mines, it is necessary to use a coal mine methane sampler to sample the methane gas being transported at the methane pipeline.

[0003] Existing gas samplers require the sampling head to be inserted into the pipeline sampling port during sampling, and the sampler must be removed and resealed after sampling. This process can cause leakage of the sampled material, resulting in inaccurate concentration detection. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this invention aims to provide a coal seam gas sampling device that can quickly start and stop sampling, preventing gas leakage from the sampler after sampling is stopped.

[0005] A coal seam gas sampling device includes: an extraction pipe for extracting gas, wherein an outlet pipe is provided on the side wall of the extraction pipe; an inlet head detachably attached to the bottom of the extraction pipe; a connector mechanism slidably connected to the side wall of the inlet head; an extraction mechanism slidably connected to the inner wall of the extraction pipe; an auxiliary mechanism located at the bottom of the extraction mechanism, wherein the auxiliary mechanism includes a suction fan; and a gas collecting bag detachably connected to the outlet pipe.

[0006] Furthermore, the air intake head includes a connecting post, a slide tube, a conical tube, and a valve ball. The connecting post is screwed to the bottom of the air extraction tube, the slide tube is fixed to the bottom of the connecting post, the conical tube is fixed to the lower part of the slide tube, and the valve ball is located at the bottom of the conical tube.

[0007] Furthermore, the small end face of the tapered tube faces downward, the bottom of the tapered tube has an opening, and the diameter of the valve ball is larger than the diameter of the opening.

[0008] Furthermore, the joint mechanism includes a sliding pipe and a gas sampling pipe. The sliding pipe is slidably connected to the slide rail pipe, and the gas sampling pipe is rotatably connected to the bottom of the sliding pipe. The gas sampling pipe is screwed to the gas pipeline.

[0009] Furthermore, the outer wall of the slide tube is provided with a protruding slider, the inner wall of the slide tube is provided with a sliding groove, and the outer wall of the slide tube is in contact with the inner wall of the slide tube.

[0010] Furthermore, a crossbar is fixed to the inner wall of the gas sampling pipe, and a valve opening rod is provided in the middle of the crossbar. The valve opening rod is vertically upward and located below the valve ball. The valve opening rod can push the valve ball.

[0011] Furthermore, the air extraction mechanism includes a sealing plate and a push-pull rod. The sealing plate has a sealing ring on its side wall, which is slidably connected to the inner wall of the air extraction pipe. The push-pull rod is fixed to the upper part of the sealing plate and passes through the top of the air extraction pipe.

[0012] Furthermore, the auxiliary mechanism also includes a motor and a protective cover. The fixed end of the motor is fixed to the bottom of the enclosed plate, the output end of the motor is fixed to the suction fan, the protective cover surrounds the motor and the suction fan, and the bottom of the protective cover is provided with air holes.

[0013] Furthermore, a first valve is provided in the middle of the side wall of the air outlet pipe.

[0014] Furthermore, the side wall of the air collecting bladder is provided with a collecting tube, the end of which is screwed to the air outlet tube, and a second valve is provided in the middle of the collecting tube.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] ① During sampling, push the air inlet head downwards to move the valve ball upwards, creating a gap between the valve ball and the opening. The collected gas can then enter the extraction tube through this gap. After sampling, pull the extraction tube upwards to move the conical tube upwards as well. At this point, the valve stem disengages from the opening, and the valve ball re-seals the opening due to gravity. Sampling can be quickly started and stopped by sliding the extraction tube up and down, enhancing the convenience of sampling.

[0017] ②The output end of the motor is fixedly connected to the suction fan. After the motor starts, it drives the suction fan to rotate, thereby accelerating the airflow speed and increasing the gas collection speed. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a coal seam gas sampling device.

[0020] Figure 2 This is a cross-sectional view of a coal seam gas sampling device.

[0021] Figure 3 This is a schematic diagram of the air inlet head of a coal seam gas sampling device.

[0022] Figure 4 This is a schematic diagram of an auxiliary mechanism in a coal seam gas sampling device.

[0023] In the diagram: 1. Suction pipe; 11. Exhaust pipe; 12. First valve; 2. Inlet head; 21. Connecting column; 22. Slide pipe; 221. Slider; 23. Conical pipe; 231. Opening; 24. Valve ball; 3. Connector mechanism; 31. Sliding pipe; 311. Slide groove; 32. Gas collection pipe; 321. Crossbar; 322. Opening valve stem; 4. Suction mechanism; 41. Sealing plate; 411. Sealing ring; 42. Push-pull rod; 5. Auxiliary mechanism; 51. Suction fan; 52. Motor; 53. Protective cover; 6. Gas collection bag; 61. Collection pipe; 62. Second valve. Detailed Implementation

[0024] 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.

[0025] like Figure 1 , Figure 2 As shown, a coal seam gas sampling device includes: an extraction pipe 1 for extracting gas, with an outlet pipe 11 on the side wall of the extraction pipe 1; an inlet head 2 detachably attached to the bottom of the extraction pipe 1; a connector mechanism 3 slidably connected to the side wall of the inlet head 2; an extraction mechanism 4 slidably connected to the inner wall of the extraction pipe 1; an auxiliary mechanism 5 located at the bottom of the extraction mechanism 4, the auxiliary mechanism 5 including a suction fan 51; and a gas collecting bag 6 detachably connected to the outlet pipe 11.

[0026] like Figure 3 As shown, the air inlet head 2 includes a connecting column 21, a slide tube 22, a conical tube 23, and a valve ball 24. The side wall of the connecting column 21 is provided with external threads. The connecting column 21 is screwed to the bottom of the suction pipe 1. The internal parts of the suction pipe 1 can be quickly disassembled and inspected by screwing. The diameter of the slide tube 31 is smaller than the diameter of the connecting column 21. The slide tube 22 is fixed to the bottom of the connecting column 21, and the conical tube 23 is fixed to the lower part of the slide tube 22. An air passage runs through the connecting column 21, the slide tube 22, and the conical tube 23. The collected gas enters the suction pipe 1 from the air passage. The valve ball 24 is located at the bottom of the conical tube 23.

[0027] The small end face of the conical tube 23 faces downward, and the bottom of the conical tube 23 is provided with an opening 231, which is the bottom of the air passage. The diameter of the valve ball 24 is larger than the diameter of the opening 231. When the device is in a vertical state, the valve ball 24 blocks the lower part of the conical tube 23 under the action of gravity, so that the gas below cannot enter the air passage, and the suction pipe 1 is in a closed state.

[0028] The connector mechanism 3 is used to connect the sampling port of the coal seam gas exhaust pipe. The connector mechanism 3 includes a sliding pipe 31 and a gas sampling pipe 32. The sliding pipe 31 is slidably connected to the slide pipe 22. The slide pipe 22 can extend and retract relative to the sliding pipe 31. The gas sampling pipe 32 is rotatably connected to the bottom of the sliding pipe 31. The inner wall of the gas sampling pipe 32 is provided with internal threads. The gas sampling pipe 32 is screwed to the gas pipeline. The contact area between the gas sampling pipe 32 and the sampling port is increased by the screwing method, which reduces the amount of gas leakage.

[0029] The outer wall of the slide tube 22 is provided with a protruding slider 221, and the inner wall of the sliding tube 31 is provided with a groove 311. The slider 221 slides in the groove 311. The groove 311 restricts the movement direction of the slider 221, so that the slide tube 22 moves vertically on the sliding tube 31. The outer wall of the slide tube 22 is in contact with the inner wall of the sliding tube 31. Both the outer wall of the slide tube 22 and the inner wall of the sliding tube 31 are coated with rubber, thereby reducing the emission of gas and ensuring the purity of the gas collected.

[0030] A crossbar 321 is fixed to the inner wall of the gas sampling pipe 32, passing through the axis of the gas sampling pipe 32. A valve stem 322 is located in the middle of the crossbar 321. The diameter of the valve stem 322 is smaller than the diameter of the opening 231. The valve stem 322 is vertically upward and located below the valve ball 24. The valve stem 322 can push the valve ball 24. During sampling, pushing the air inlet head 2 downward causes the valve ball 24 to move upward, creating a gap between the valve ball 24 and the opening 231. The collected gas can then enter the extraction pipe 1 through this gap. After sampling, pulling the extraction pipe 1 upward causes the conical pipe 23 to move upward as well. At this point, the valve stem 322 disengages from the opening 231, and the valve ball 24 re-seals the opening 231 due to gravity. Sampling can be quickly started and stopped by sliding the extraction pipe 1 up and down, enhancing the convenience of sampling.

[0031] The suction mechanism 4 creates a negative pressure inside the suction pipe 1, facilitating the entry of collected methane gas into the suction pipe 1. The suction mechanism 4 includes a sealing plate 41 and a push-pull rod 42. A sealing ring 411 is provided on the side wall of the sealing plate 41, slidably connected to the inner wall of the suction pipe 1. The sealing ring 411 is tightly fitted against the inner wall of the suction pipe 1 to prevent leakage. The sealing ring 411 needs to be replaced promptly when it is severely worn. The push-pull rod 42 is fixed to the upper part of the sealing plate 41 and passes through the top of the suction pipe 1. During use, pulling the push-pull rod 42 moves the sealing plate 41 up and down. A scale line is provided on the side wall of the push-pull rod 42. When the scale line is located outside the suction pipe 1, the auxiliary mechanism 5 is located above the outlet pipe 11, allowing methane gas to enter the outlet pipe 11.

[0032] like Figure 4As shown, the auxiliary mechanism 5 also includes a motor 52 and a protective cover 53. The fixed end of the motor 52 is fixed to the bottom of the enclosed plate 41, and the output end of the motor 52 is fixed to the suction fan 51. After the motor 52 starts, it drives the suction fan 51 to rotate, thereby increasing the airflow speed and improving the gas collection speed. The protective cover 53 surrounds the motor 52 and the suction fan 51. The bottom of the protective cover 53 is provided with air holes. The protective cover 53 protects the suction fan 51 from being damaged by the impact of coal slag entering the suction pipe 1 on the fan blades. The air holes allow the suction fan 51 to draw air and accelerate gas circulation.

[0033] A first valve 12 is provided in the middle of the side wall of the vent pipe 11. When the first valve 12 is closed, the vent pipe 11 cannot emit gas. When the first valve 12 is opened, the gas in the suction pipe 1 flows out from the vent pipe 11. When only a small amount of gas is collected, the first valve 12 is closed, so that the collected gas is stored in the suction pipe 1. When a large amount of gas is collected, a gas collecting bag 6 is installed at the vent pipe 11 to transfer the gas into the gas collecting bag 6.

[0034] The gas collecting bladder 6 has a collecting tube 61 on its side wall. The end of the collecting tube 61 is screwed to the gas outlet tube 11. The middle part of the collecting tube 61 has a second valve 62. When a large amount of gas needs to be collected, the collecting tube 61 is screwed into the gas outlet tube 11. After collection is completed, the first valve 12 and the second valve 62 are closed in sequence. Then the collecting tube 61 can be removed from the gas outlet tube 11.

[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A coal seam gas sampling device, characterized in that, include: A gas extraction pipe (1) for extracting gas, wherein a gas outlet pipe (11) is provided on the side wall of the gas extraction pipe (1); An air inlet head (2) is detachable from the bottom of the air extraction pipe (1); A connector mechanism (3) is slidably connected to the side wall of the air intake head (2); A suction mechanism (4) is slidably connected to the inner wall of the suction pipe (1); An auxiliary mechanism (5) is provided at the bottom of the suction mechanism (4), the auxiliary mechanism (5) including a suction fan (51); and The air-collecting airbag (6) is detachably connected to the air outlet pipe (11).

2. The coal seam gas sampling device according to claim 1, characterized in that: The air inlet head (2) includes a connecting post (21), a slide tube (22), a conical tube (23), and a valve ball (24). The connecting post (21) is screwed to the bottom of the air extraction tube (1), the slide tube (22) is fixed to the bottom of the connecting post (21), the conical tube (23) is fixed to the lower part of the slide tube (22), and the valve ball (24) is located at the bottom of the conical tube (23).

3. The coal seam gas sampling device according to claim 2, characterized in that: The small end face of the tapered tube (23) is facing downwards, and the bottom of the tapered tube (23) is provided with an opening (231). The diameter of the valve ball (24) is larger than the diameter of the opening (231).

4. The coal seam gas sampling device according to claim 3, characterized in that: The joint mechanism (3) includes a sliding tube (31) and a gas sampling tube (32). The sliding tube (31) is slidably connected to the slide tube (22), and the gas sampling tube (32) is rotatably connected to the bottom of the sliding tube (31). The gas sampling tube (32) is screwed to the gas pipeline.

5. A coal seam gas sampling device according to claim 4, characterized in that: The outer wall of the slide tube (22) is provided with a protruding slider (221), and the inner wall of the slide tube (31) is provided with a sliding groove (311). The outer wall of the slide tube (22) is in contact with the inner wall of the slide tube (31).

6. The coal seam gas sampling device according to claim 5, characterized in that: A crossbar (321) is fixed to the inner wall of the gas sampling pipe (32). A valve opening rod (322) is provided in the middle of the crossbar (321). The valve opening rod (322) is vertically upward and is located below the valve ball (24). The valve opening rod (322) can push the valve ball (24).

7. A coal seam gas sampling device according to claim 6, characterized in that: The air extraction mechanism (4) includes a sealing plate (41) and a push-pull rod (42). The sealing plate (41) has a sealing ring (411) on its side wall. The sealing ring (411) is slidably connected to the inner wall of the air extraction pipe (1). The push-pull rod (42) is fixed to the upper part of the sealing plate (41) and passes through the top of the air extraction pipe (1).

8. A coal seam gas sampling device according to claim 7, characterized in that: The auxiliary mechanism (5) also includes a motor (52) and a protective cover (53). The fixed end of the motor (52) is fixed to the bottom of the closed plate (41), and the output end of the motor (52) is fixed to the suction fan (51). The protective cover (53) surrounds the motor (52) and the suction fan (51), and the bottom of the protective cover (53) is provided with air holes.

9. A coal seam gas sampling device according to claim 8, characterized in that: A first valve (12) is provided in the middle of the side wall of the air outlet pipe (11).

10. A coal seam gas sampling device according to claim 9, characterized in that: The side wall of the gas collecting bag (6) is provided with a collecting tube (61), the end of the collecting tube (61) is screwed to the air outlet tube (11), and a second valve (62) is provided in the middle of the collecting tube (61).

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