Gas drilling gas leakage detection device

Abstract

The utility model discloses a gas leakage detection device for a gas drilling hole. The gas leakage detection device for the gas drilling hole comprises a base installed at an opening of a hole and a rubber plug located in the base. The base comprises a wing ring, a sleeve is fixedly arranged at one end of the wing ring, and a sealing gasket is arranged on the side wall of the wing ring; the rubber plug comprises a plug, a capillary tube is mounted on the plug, and a through hole for an exhaust pipe for extracting gas to penetrate through is formed in the plug; and the plug is fixedly mounted in the sleeve. According to the gas drilling gas leakage detection device provided by the utility model, the capillary tube is arranged to assist a worker in judging the pressure intensity condition in the hole so as to judge whether gas leakage exists in the gas extraction process, and compared with the prior art, the device is simpler in structure and higher in working stability.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and in particular to a gas borehole leakage detection device. Background Technology

[0002] Gas drilling and extraction is one of the key technologies for safe production in coal mines. It aims to reduce the concentration of gas in the mine and prevent gas explosions and poisoning accidents. This technology involves drilling holes in the coal seam and using extraction equipment to extract the gas.

[0003] The prior art discloses a gas extraction borehole sealing pipe leakage detection device, including a main connecting pipe. The inlet end of the main connecting pipe is connected to the sealing pipe via a rubber tube, and the outlet end of the main connecting pipe is connected to a duct connector. A valve plate mechanism is provided inside the main connecting pipe. A rotating shaft and a lead screw shaft are fixedly connected to the edge of the valve plate mechanism. The rotating shaft and the lead screw shaft pass through the main connecting pipe respectively. An outer protective pipe is connected to the main connecting pipe at the position where the rotating shaft passes through. A valve seat is connected to the end of the outer protective pipe. The rotating shaft extends into the valve seat and is connected to the handle on the outer wall of the valve seat. A duct is connected to the main connecting pipe at the position where the lead screw shaft passes through. A pressure gauge is connected to the end of the duct. An opening is also provided on the side wall of the main connecting pipe where it connects to the duct. The lead screw shaft passes through the duct and is screwed onto a slider. A plug is connected to the slider.

[0004] The aforementioned device contains complex structures such as a rotor, a lead screw, a rotor shaft, a lead screw, and a pressure gauge. The working environment in mines is complex and contains a large amount of dust particles. Dust falling onto the surface of the components may cause problems such as inflexible operation.

[0005] Therefore, it is necessary to provide a gas borehole leakage detection device to solve the above-mentioned technical problems. Utility Model Content

[0006] In view of the above situation and to overcome the defects of the existing technology, this utility model provides a gas borehole leakage detection device that can achieve the effect of detecting leakage at the borehole opening with a simpler structure.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A gas borehole leakage detection device includes: a base installed at the borehole opening, and a rubber plug located inside the base; the base includes a wing ring, one end of which is fixedly provided with a sleeve, and the side wall of the wing ring is provided with a sealing gasket; the rubber plug includes a plug, a capillary tube is installed on the plug, and a through hole is opened on the plug for a gas extraction pipe to pass through; the plug is fixedly installed in the sleeve.

[0009] Preferably, an extension tube extends outward from the through hole of the plug, and a reducing sleeve is fitted around the extension tube.

[0010] Preferably, one end of the plug is provided with a sealing cap, the diameter of which is larger than that of the plug, and the inner diameter of the wing ring is the same as that of the sealing cap.

[0011] Preferably, the wing ring and the rubber plug are provided with small holes for the expansion bolts to pass through, and the expansion bolts are fixed to the rock wall.

[0012] Preferably, the capillary is L-shaped, with one section inside the plug being horizontal and the other section on one side of the plug opening downwards.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) This utility model enables workers to judge the pressure in the orifice by setting a capillary tube, thereby judging whether there is a gas leak during the extraction of gas. The structure of this device is simpler and the working stability is higher than that of the prior art.

[0015] (2) By setting an extension tube, the contact area between the plug and the suction pipe can be increased. At the same time, the contact pressure between the extension tube and the suction pipe can be increased by using a variable diameter cylinder, thereby improving the sealing effect between the two.

[0016] (3) By setting a sealing cap, the contact surface between the rubber plug and the sleeve and the wing ring is increased, which can increase the sealing effect. Attached Figure Description

[0017] Figure 1 A schematic diagram of the installation of the gas borehole leakage detection device provided by this utility model;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 A schematic diagram of the gas borehole leakage detection device provided by this utility model;

[0020] Figure 4 Exploded view from the first perspective of the gas borehole leakage detection device provided by this utility model;

[0021] Figure 5 Exploded view from a second perspective of the gas borehole leakage detection device provided by this utility model;

[0022] Figure 6 A schematic diagram of the structure of the rubber stopper of the gas borehole leakage detection device provided by this utility model.

[0023] The corresponding names of the reference numerals in the attached drawings are as follows: 10, base; 11, wing ring; 12, sleeve; 13, sealing gasket; 14, expansion bolt; 20, rubber plug; 21, plug; 211, sealing cap; 22, extension tube; 23, reducing cylinder; 24, nut; 25, capillary tube. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0025] Coal seams contain large amounts of methane gas, which, when mixed with air, is highly prone to explosion. Therefore, methane gas extraction during coal mining is a crucial and indispensable measure to ensure mine safety. Current methane extraction methods involve drilling holes in the coal seam walls to extract the gas. Figure 1 As shown, firstly, a hole is drilled in the coal mine wall using drilling machinery. Then, an extraction pipe is buried in the hole. At the same time, high-pressure concrete or other materials are poured into the appropriate part of the hole to form a sealed surface in the gaps within the coal seam. Finally, a pump is used to connect to the extraction pipe to extract the gas. However, sealing is one of the key factors to ensure the efficiency of this extraction process. If the concrete or other materials are not properly sealed, air may enter the hole and mix with the gas, which also poses a potential danger. The inventors discovered that if a device is installed at the opening of the hole to detect whether air is flowing in, it can help workers judge the working status of gas extraction and thus take timely countermeasures.

[0026] First embodiment:

[0027] like Figure 1-6 As shown, the gas borehole leakage detection device provided by this utility model includes: a base 10 installed at the borehole opening, the base 10 being installed and fixed at the borehole opening and connected to a rubber plug 20 located inside the base 10.

[0028] Specifically, the base 10 consists of the following parts: a circular wing ring 11 and a cylindrical sleeve 12 that is perpendicular to the side of the wing ring 11 and welded thereon. A rubber circular sealing gasket 13 is fitted on the side wall of the wing ring 11 near the rock layer. Through holes for expansion bolts 14 to pass through are opened at corresponding positions of the wing ring 11 and the sealing gasket 13.

[0029] On the other hand, such as Figure 3-4As shown, the rubber stopper 20 includes a plug 21, which is a cylindrical structure made of rubber. An axially oriented suction tube for extracting gas passes through a circular through hole. The diameter of the plug 21 is the same as that of the inner wall of the sleeve 12. The two are glued together and fixed to keep their end faces aligned. A transparent glass capillary tube 25 is inserted into the plug 21. One end of the capillary tube 25 is located on the left side of the plug 21, and the other end is located on the right side of the plug 21.

[0030] In use, first pass the air extraction pipe through the through hole on the plug 21, then place the sleeve 12 into the hole opening, and use an impact drill to drill a hole on the coal seam wall according to the position of the through hole on the wing ring 11. Then pass the expansion bolt 14 through the through holes of the wing ring 11 and the sealing gasket 13 and finally into the hole on the coal seam wall. Finally, fix the expansion bolt 14 so that the wing ring 11 and the sealing gasket 13 are installed on the rock wall. The sealing gasket 13 is located between the wing ring 11 and the sealing rock wall to seal the gap between them. Finally, inject a small amount of red ink into the end of the capillary tube 25. When the sealed section formed by the concrete leaks air, the negative pressure zone formed in the hole due to the air extraction pipe spreads to the hole port. When a pressure difference is generated on the left and right sides of the capillary tube 25, the red ink in the capillary tube 25 moves towards the negative pressure zone. The operator can judge whether there is an air leak in the hole based on the movement of the ink.

[0031] By setting up a capillary tube 25, the operator can make a judgment on the pressure in the orifice, and thus determine whether there is a gas leak during the gas extraction process. The structure of this device is simpler and the operation is more stable than the existing technology.

[0032] Second embodiment:

[0033] like Figure 2 , Figure 6 As shown, an extension tube 22 of the same material extends outward from the through hole of the plug 21. The inner diameter of the extension tube 22 is the same as the inner diameter of the through hole. A reducing cylinder 23 is fitted around the extension tube 22. The shape of the reducing cylinder 23 is as shown. Figure 6 As shown, it is approximately cylindrical with an external thread that fits the nut 24. It has axially spaced gaps and the outer diameter linearly decreases from one end near the plug 21 to the far end. Therefore, when the nut 24 rotates on it, the diameter of the variable diameter cylinder 23 is circumferentially compressed by the nut 24. During compression, the inner wall of the variable diameter cylinder 23 squeezes the extension tube 22. The extension tube 22 is compressed and deformed inside the suction pipe and the variable diameter cylinder 23 and comes into close contact with the two.

[0034] By setting the extension tube 22, the contact area between the plug 21 and the suction pipe can be increased. At the same time, the contact pressure between the extension tube 22 and the suction pipe can be increased by using the reducing cylinder 23, thereby improving the sealing effect between the two.

[0035] Third embodiment:

[0036] like Figure 4 As shown, a sealing cap 211 is provided at one end of the plug 21. The diameter of the sealing cap 211 is larger than that of the plug 21. The inner diameter of the wing ring 11 is the same as that of the sealing cap 211. At the same time, the inner diameter of the wing ring 11 is between the inner diameter and the outer diameter of the sleeve 12. That is to say, the connection position between the wing ring 11 and the sleeve 12 is stepped. The sealing cap 211 is fitted into the groove formed by the wing ring 11 and the sleeve 12.

[0037] By setting a sealing cap 211 to increase the contact area between the rubber plug 20, the sleeve 12, and the wing ring 11, the sealing effect can be increased.

[0038] Fourth embodiment:

[0039] like Figure 4 As shown, the capillary tube 25 is L-shaped. One section of it is horizontal inside the plug 21, and the other section on one side of the plug 21 has an opening facing downwards. Workers can connect a water bag of a certain capacity to the downward opening of the capillary tube 25. If the water in the water bag is drawn out and the volume decreases, it indicates that the other end of the capillary tube 25 is a negative pressure zone.

[0040] Working principle: When the sealed section formed by the concrete leaks air, the negative pressure zone formed in the hole due to the air extraction pipe spreads to the hole port. When a pressure difference is generated on the left and right sides of the capillary tube 25, the red ink in the capillary tube 25 moves towards the negative pressure zone. The staff can judge whether there is an air leak in the hole based on the movement of the ink.

[0041] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A gas leakage detecting device for a gas drilling, characterized by comprising: include: A base (10) installed at the opening of the orifice, and a rubber plug (20) located inside the base (10); the base (10) includes a wing ring (11), one end of which is fixedly provided with a sleeve (12), and the side wall of the wing ring (11) is provided with a sealing gasket (13); the rubber plug (20) includes a plug (21), on which a capillary tube (25) is installed, and a through hole is opened on the plug (21) for a gas extraction pipe to pass through; the plug (21) is fixedly installed in the sleeve (12).

2. The gas loss detection device of claim 1, wherein, An extension tube (22) extends outward from the through hole of the plug (21), and a variable diameter sleeve (23) is fitted around the extension tube (22).

3. The gas leak detection apparatus of claim 1, wherein, The plug (21) has a sealing cap (211) at one end. The diameter of the sealing cap (211) is larger than that of the plug (21), and the inner diameter of the wing ring (11) is the same as that of the sealing cap (211).

4. The apparatus according to claim 1 or 3, wherein The wing ring (11) and the rubber plug (20) are provided with small holes for the expansion bolt (14) to pass through, and the expansion bolt (14) is fixed to the rock wall.

5. The apparatus of claim 1, wherein, The capillary tube (25) is L-shaped, with one section inside the plug (21) being horizontal and the other section on one side of the plug (21) opening downwards.

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