A coal mine underground drilling gas extraction pipe gas sampling and measuring device

Abstract

The utility model discloses a kind of coal mine underground drilling gas extraction pipe gas sampling determination device, including connecting pipeline, two detectors are equipped on connecting pipeline, connecting pipeline includes first detection channel and second detection channel, first detection channel two ends are respectively communicated with extraction main pipe and extraction branch pipe, one detector is connected with first detection channel, second detection channel one end is inserted into extraction main pipe, and the other end extends to the coal body drilling hole sealing section of extraction branch pipe, another detector is connected with second detection channel.The utility model in the present application, by setting bypass connecting pipeline on extraction main pipe and extraction branch pipe, and connecting pipeline is divided into two detection channels, utilize the pipeline flow resistance formed by the airflow in gas extraction pipe, overcome pipeline negative pressure sampling, can be quickly determined to the gas of extraction pipe orifice and drilling deep part, to determine whether drilling, namely extraction main pipe leaks.

Description

Technical Field

[0001] This utility model relates to the field of coal mine tunnel engineering technology, and more specifically to a gas sampling and measuring device for underground coal mine borehole gas extraction pipes. Background Technology

[0002] In underground gas extraction in coal mines, it is necessary to measure the gas parameters inside the borehole extraction pipe. Each time the gas inside the extraction pipe is measured, the gas inside the extraction pipe must first be extracted with a sampling gas cylinder before the measurement is performed. The process is cumbersome. Due to the negative pressure effect of the extraction pipeline, it is easy to cause gas leakage during sampling, which increases the measurement error. For the part inside the borehole sealing section, it is impossible to measure the gas concentration deep inside the borehole by connecting with ordinary rubber hoses, so it is impossible to know the gas leakage situation in the borehole.

[0003] To address the aforementioned issues, the flow resistance within the gas extraction pipe itself is utilized to employ a bypass sampling method using a rubber hose. This overcomes the negative pressure in the pipeline, enabling rapid sampling and measurement while reducing leakage and improving accuracy. Furthermore, a metal capillary tube is placed inside the sampling hose and inserted through a nozzle into the sealed section of the coal borehole for sampling and detection, allowing for the determination of the original gas concentration deep within the borehole. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to determine the sealing performance of a borehole.

[0005] This utility model solves the above-mentioned technical problems through the following technical means: a gas sampling and measuring device for underground coal mine borehole gas extraction pipe, including a connecting pipeline, two detectors on the connecting pipeline, the connecting pipeline including a first detection channel and a second detection channel, the two ends of the first detection channel being connected to the main extraction pipe and the extraction branch pipe respectively, one detector being connected to the first detection channel, one end of the second detection channel extending into the main extraction pipe, and the other end extending into the coal body borehole sealing section of the extraction branch pipe, and the other detector being connected to the second detection channel.

[0006] As a preferred technical solution, the connecting pipeline includes an inner pipe and an outer pipe sleeved on the outside of the inner pipe. The inner wall of the inner pipe forms a second detection channel, and the inner pipe and the outer pipe form a first detection channel.

[0007] As a preferred technical solution, it also includes a gas storage box, which has two non-communicating detection chambers, with two detectors located in the two detection chambers respectively.

[0008] As a preferred technical solution, the first detection channel is located outside the second detection channel.

[0009] As a preferred technical solution, it also includes a gas-water separation box, and both the first detection channel and the second detection channel are connected to the gas-water separation box.

[0010] As a preferred technical solution, valves are provided at the connection ends of the first and second detection channels with the main extraction pipe and the branch extraction pipe.

[0011] As a preferred technical solution, the main extraction pipe is equipped with a detection valve one, and the extraction branch pipe is equipped with a detection valve two.

[0012] As a preferred technical solution, the inner tube includes a metal capillary tube, and the outer tube includes a connecting rubber tube.

[0013] As a preferred technical solution, the inner tube and the outer tube may be coaxial or non-coaxial.

[0014] As a preferred technical solution, the first detection channel, the second detection channel, and the main extraction pipe and the branch extraction pipe are detachably connected.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) In this utility model, by setting a bypass connecting pipeline on the main extraction pipe and the branch extraction pipe, and dividing the connecting pipeline into two detection channels, the pipeline flow resistance formed by the airflow in the gas extraction pipe is used to overcome the negative pressure of the pipeline for sampling. This allows for rapid measurement of the gas at the orifice of the extraction pipe and the depth of the borehole. By comparing the gas concentration at the depth of the borehole with the gas concentration in the extraction pipe, the leakage of the borehole can be determined, and it can be determined whether the borehole, i.e. the main extraction pipe, is leaking.

[0017] (2) In this utility model, by setting the first detection channel, the second detection channel and the main extraction pipe and the extraction branch pipe to a detachable connection method, it is convenient to connect and detect the main extraction pipe and different extraction branch pipes.

[0018] (3) In this utility model, the gas storage box provides two independent cavities, which improves the accuracy of detection. Attached Figure Description

[0019] Figure 1 A schematic diagram illustrating the application of the device provided in this embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the device provided in an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the connecting pipeline structure provided in an embodiment of the present utility model;

[0022] Reference numerals: 1. Connecting pipeline; 11. Connecting hose; 12. Metal capillary tube; 2. Gas storage box; 3. Gas-water separation box; 4. Detector; 5. Detection gas valve one; 6. Detection gas valve two; 7. Coal body. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] See Figure 1 , Figure 2 A gas sampling and measuring device for a coal mine underground borehole gas extraction pipe includes a connecting pipe 1, on which a gas-water separation box 3 and a gas storage box 2 are provided. The gas-water separation box 3 is used to separate gas and water. The connecting pipe 1 is divided into three connecting sections: connecting section one, connecting section two, and connecting section three. One end of connecting section one is detachably connected to the main extraction pipe, and the other end is connected to the input end of the gas storage box 2. One end of connecting section two is connected to the output end of the gas storage box 2, and the other end of connecting section two is connected to the input end of the gas-water separation box 3. The other end is detachably connected to an extraction branch pipe. The main extraction pipe and the extraction branch pipe are connected, and a shut-off valve is provided between the extraction branch pipe and the main extraction pipe. The extraction branch pipe extends into the extraction hole of the coal body 7.

[0025] The connecting pipe 1 includes a first detection channel and a second detection channel set inside and outside. In this embodiment, the first detection channel is located outside the second detection channel. Connecting section one, connecting section two, and connecting section three are all structures with the first detection channel and the second detection channel set inside and outside the layers.

[0026] The gas storage box 2 has two independent detection chambers, each containing a detector 4. The detector is a commercially available component, such as the Zhuoan brand CD4 multi-parameter mine gas detector. In this embodiment, detection chamber one and detection chamber two are used as examples. Detection chamber one and detection chamber two are not connected to each other. One end of the second detection channel of connecting section two is connected to the output end of detection chamber one, and the second detection channel of connecting section one is connected to the input end of detection chamber one. The first detection channel of connecting section one is connected to the input end of detection chamber two, and the first detection channel of connecting section two is connected to the output end of detection chamber two. This allows for the measurement of the gas at the orifice of the extraction pipe.

[0027] One end of the second detection channel of the connecting section one extends into the main extraction pipe, and the second detection channel of the connecting section three extends into the borehole sealing section of the coal body 7 of the extraction branch pipe, so that the gas at the depth of the borehole can be measured.

[0028] See Figure 3The connecting pipe 1 includes an inner pipe and an outer pipe sleeved on the outside of the inner pipe. The inner wall of the inner pipe forms a second detection channel, and the inner pipe and the outer pipe form a first detection channel. The inner pipe includes a metal capillary tube 12, and the outer pipe includes a connecting hose 11. The main extraction pipe and the branch extraction pipe are respectively equipped with a detection air valve 1 5 and a detection air valve 2 6, which facilitates the disassembly and assembly of the interface between the connecting hose 11 and the detection air valve 1 5 and the detection air valve 2 6.

[0029] Because the connecting hose 11 of the connecting pipe 1 has a certain degree of flexibility, the metal capillary tube 12 may be coaxial or non-coaxial with the axis of the connecting hose 11.

[0030] How to use:

[0031] First, the metal capillary tube 12 inside the connecting hose 11 is inserted into the stop valve to reach the depth of the borehole. Then, the connecting hose 11 is connected to the detection nozzle valve 6 on the extraction main pipe. The metal capillary tube 12 of the connecting section 1 is inserted into the detection nozzle valve 5, and the connecting hose 11 is connected at the same time. The airflow in the depth of the borehole and the extraction pipe at the orifice will enter the two detection chambers in the gas storage box 2 through the first and second detection channels, and finally flow back to the extraction branch pipe. The detector 4 in the gas storage box 2 detects parameters such as methane, carbon dioxide, carbon monoxide, and oxygen in the depth of the extraction borehole and the extraction pipe. After the measurement of one in-seam borehole is completed, the rubber tube on the detection nozzle valve 6 is removed, the metal capillary tube 12 is pulled out, and then inserted into the detection nozzle valve of another in-seam borehole for detection. This allows for continuous detection of gas in the depth of each extraction borehole and the orifice pipeline.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gas sampling and measuring device for underground coal mine borehole gas extraction pipes, characterized in that, The system includes a connecting pipeline with two detectors. The connecting pipeline includes a first detection channel and a second detection channel. The first detection channel is connected to the main extraction pipe and the extraction branch pipe at both ends, respectively. One detector is connected to the first detection channel. One end of the second detection channel extends into the main extraction pipe, and the other end extends into the coal borehole sealing section of the extraction branch pipe. The other detector is connected to the second detection channel.

2. The gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 1, characterized in that, The connecting pipeline includes an inner pipe and an outer pipe sleeved on the outside of the inner pipe. The inner wall of the inner pipe forms a second detection channel, and the inner pipe and the outer pipe form a first detection channel.

3. The gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 1, characterized in that, It also includes a gas storage box, which contains two non-connected detection chambers, with two detectors located in the two detection chambers respectively.

4. The gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 1, characterized in that, The first detection channel is located outside the second detection channel.

5. The gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 1, characterized in that, It also includes a gas-water separation box, and both the first and second detection channels are connected to the gas-water separation box.

6. The gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 1, characterized in that, Valves are installed at the connection points of the first and second detection channels with the main and branch pipes of the extraction pipeline.

7. A gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 6, characterized in that, The main extraction pipe is equipped with a detection valve one, and the extraction branch pipe is equipped with a detection valve two.

8. A gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 2, characterized in that, The inner tube includes a metal capillary tube, and the outer tube includes a connecting rubber tube.

9. A gas sampling and measuring device for a coal mine underground borehole gas extraction pipe according to claim 2, characterized in that, The inner tube and the outer tube may be coaxial or non-coaxial.

10. A gas sampling and measuring device for underground coal mine borehole gas extraction pipes according to claim 1, characterized in that, The first and second detection channels are detachably connected to the main and branch pipes of the sampling system.

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