Negative-pressure self-adaptive gas extraction hole sealing device

Abstract

The utility model belongs to the technical field of gas extraction, and particularly relates to a negative-pressure self-adaption gas extraction hole sealing device which comprises a gas extraction pipe, a high-pressure air bag is connected to the surface of the outer side of the bottom end of the gas extraction pipe, and a gas guide pipe is connected to the surface of the top of the high-pressure air bag. Through mutual cooperation of the high-pressure air bag, the air guide pipe, the connecting pipe, the air pump, the pressure sensor and the anti-explosion electromagnetic valve, when a drill hole deforms due to changes of mining-induced stress and crustal stress, the pressure sensor monitors the pressure in the high-pressure air bag in real time through the connecting pipe, and if the pressure changes abnormally, the PLC control switch can control the pressure in the high-pressure air bag according to a preset program. The air pump and the anti-explosion electromagnetic valve are controlled to adjust the air pressure in the high-pressure air bag, so that the high-pressure air bag adjusts deformation in a self-adaptive mode, gaps generated by drill hole deformation are filled, the hole sealing effect is ensured, good sealing performance is continuously kept, and the situation that external air permeates into a drill hole, and consequently the negative pressure stability of an extraction system is affected is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of gas extraction technology, specifically relating to a negative pressure adaptive gas extraction sealing device. Background Technology

[0002] Gas extraction refers to the process of extracting gas from coal seams using specialized equipment and technology. This is an important measure for safe coal mine production and the utilization of gas resources.

[0003] During gas extraction, operators use gas extraction sealing devices to seal the borehole, preventing outside air from entering and ensuring gas extraction. However, traditional gas extraction sealing devices typically use rigid or semi-rigid materials such as cement mortar or polyurethane for sealing. When the borehole deforms due to mining stress or changes in ground stress, the rigid material is prone to cracking, leading to seal failure and affecting gas extraction operations.

[0004] Therefore, this utility model provides a negative pressure adaptive gas extraction sealing device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a negative pressure adaptive gas extraction sealing device, which aims to solve the problem that existing traditional gas extraction sealing devices generally use rigid or semi-rigid materials such as cement mortar and polyurethane for sealing. When the borehole is deformed by factors such as mining stress and changes in ground stress, the rigid material is prone to cracking, leading to sealing failure and affecting gas extraction operations.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a negative pressure adaptive gas extraction and sealing device, comprising a gas extraction pipe, a high-pressure airbag connected to the outer surface of the bottom end of the gas extraction pipe, a gas guide pipe connected to the top surface of the high-pressure airbag, the other end of the gas guide pipe connected to a connecting pipe, one end of the connecting pipe connected to the output end of an air pump, and the other end of the connecting pipe connected to the input end of an air pump, a pressure sensor connected to the outer surface of one end of the connecting pipe, and an explosion-proof solenoid valve penetratingly connected to the other end of the connecting pipe, an extraction head connected to the bottom surface of the gas extraction pipe, a placement groove formed on the top surface of the extraction head, a filter basket slidably placed inside the placement groove, a sealing gasket placed between the filter basket and the placement groove, and the sealing gasket forming a sliding connection with the extraction head through the placement groove.

[0007] In a preferred embodiment of the negative pressure adaptive gas extraction sealing device of this utility model, the internal space of the gas guide pipe is connected to the internal space of the high-pressure airbag.

[0008] In a preferred embodiment of the negative pressure adaptive gas extraction and sealing device of this utility model, the air pump, pressure sensor and explosion-proof solenoid valve are electrically connected to an external power supply via a PLC control switch.

[0009] As a preferred embodiment of the negative pressure adaptive gas extraction sealing device of this utility model, a bolt is connected through the top surface of the filter basket, one end of the bolt is connected through a through hole opened on the top surface of the sealing gasket, and the other end of the bolt is threadedly connected to the fixing hole, which is opened on the bottom surface of the placement groove.

[0010] As a preferred embodiment of the negative pressure adaptive gas extraction sealing device of this utility model, a threaded ring is connected to the top surface of the extraction head, and one end of the threaded ring forms a threaded connection with the threaded groove, which is opened on the bottom surface of the gas extraction pipe.

[0011] As a preferred embodiment of the negative pressure adaptive gas extraction sealing device of this utility model, a sealing ring is connected around the outer surface of the bottom end of the threaded ring, one end of the sealing ring is engaged in the interior of the sealing groove, and the sealing groove is opened on the inner surface of the bottom end of the threaded groove.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention utilizes the coordinated operation of a high-pressure airbag, a gas guide pipe, a connecting pipe, an air pump, a pressure sensor, and an explosion-proof solenoid valve. When the borehole deforms due to changes in mining stress and ground stress, the pressure sensor monitors the pressure inside the high-pressure airbag in real time through the connecting pipe. If the pressure changes abnormally, the PLC control switch will adjust the gas pressure inside the high-pressure airbag according to a preset program, controlling the air pump and the explosion-proof solenoid valve. This allows the high-pressure airbag to adaptively adjust its deformation, filling the gaps caused by borehole deformation and ensuring a sealing effect. This maintains good sealing performance and prevents outside air from seeping into the borehole, thus affecting the negative pressure stability of the extraction system.

[0014] This invention, through the cooperation of an extraction head, a sealing gasket, a filter basket, bolts, and a threaded ring, allows an extraction head with a filter basket to be installed at one end of a gas extraction pipe. In this way, during the gas extraction process, the filter basket can effectively filter impurities in the gas, thereby improving the quality of extracted gas and facilitating its subsequent utilization. Attached Figure Description

[0015] 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:

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a partial bottom view of the structure of this utility model;

[0018] Figure 3 This is a partial cross-sectional exploded structural diagram of the present invention;

[0019] Figure 4 This is a schematic diagram of the exploded structure of the extraction head of this utility model.

[0020] In the diagram: 1. Gas extraction pipe; 2. High-pressure airbag; 3. Air guide pipe; 4. Connecting pipe; 5. Air pump; 6. Pressure sensor; 7. Explosion-proof solenoid valve; 8. Extraction head; 9. Placement slot; 10. Sealing gasket; 11. Filter basket; 12. Bolt; 13. Through hole; 14. Fixing hole; 15. Threaded ring; 16. Threaded groove; 17. Sealing ring; 18. Sealing groove. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-4 The present invention provides the following technical solution: a negative pressure adaptive gas extraction and sealing device, comprising a gas extraction pipe 1, a high-pressure airbag 2 connected to the outer surface of the bottom end of the gas extraction pipe 1, a gas guide pipe 3 connected to the top surface of the high-pressure airbag 2, the other end of the gas guide pipe 3 connected to a connecting pipe 4, one end of the connecting pipe 4 connected to the output end of an air pump 5, and the other end of the connecting pipe 4 connected to the input end of the air pump 5, a pressure sensor 6 connected to the outer surface of one end of the connecting pipe 4, and an explosion-proof solenoid valve 7 connected through the other end of the connecting pipe 4, an extraction head 8 connected to the bottom surface of the gas extraction pipe 1, a placement groove 9 opened on the top surface of the extraction head 8, a filter basket 11 slidably placed inside the placement groove 9, a sealing gasket 10 placed between the filter basket 11 and the placement groove 9, and the sealing gasket 10 forming a sliding connection with the extraction head 8 through the placement groove 9.

[0023] The high-pressure airbag 2 is made of nitrile rubber.

[0024] Preferably, the internal space of the air duct 3 is connected to the internal space of the high-pressure airbag 2.

[0025] In practical use, the air guide tube 3 can supply and evacuate air into the high-pressure airbag 2, thereby changing the pressure inside the high-pressure airbag 2. The connection between the air guide tube 3 and the high-pressure airbag 2 adopts an embedded sealing structure and is fixed by a threaded interface. It is reinforced with sealant to enhance airtightness and prevent gas leakage from affecting the pressure regulation accuracy. In addition, the surface of the air guide tube 3 is covered with an anti-static layer to prevent static electricity generated by friction from causing safety hazards.

[0026] Preferably, the air pump 5, pressure sensor 6, and explosion-proof solenoid valve 7 are electrically connected to an external power supply via a PLC control switch.

[0027] In practical use, air pump 5 is a 2QB810-SAH27 high-pressure vortex air pump, enabling it to operate in both suction and delivery modes. Pressure sensor 6 is an XF807-GPD10 mining pressure sensor. Explosion-proof solenoid valve 7 is a WZE explosion-proof solenoid valve. The PLC control switch is an S7-1200 PLC control switch. Operators can program the PLC control switch according to their needs. Simultaneously, the forward and reverse control circuit of air pump 5 is connected to the digital output port of the PLC control switch, working in conjunction with an intermediate relay to realize the air pump... 5. Switching between air supply and air extraction modes: Pressure sensor 6 is connected to the analog input module of the PLC control switch. Its output 4-20mA standard signal is converted into a digital signal by the module, which can be used by the PLC control switch for pressure data acquisition and analysis. The control coil of explosion-proof solenoid valve 7 is connected to the digital output module of the PLC control switch. The 24V DC signal output by the PLC control switch drives the opening and closing of explosion-proof solenoid valve 7. In this way, the PLC control switch can control the operation of air pump 5, pressure sensor 6 and explosion-proof solenoid valve 7 through a pre-written program.

[0028] Preferably, a bolt 12 is connected through the top surface of the filter basket 11, and a through hole 13 is connected through the top surface of the sealing gasket 10 at one end of the bolt 12. The other end of the bolt 12 is threadedly connected to the fixing hole 14, which is located on the bottom surface of the placement groove 9.

[0029] In practical use, slide the sealing gasket 10 into the placement groove 9 on the extraction head 8, aligning the through hole 13 on the sealing gasket 10 with the fixing hole 14. Then slide the filter basket 11 into the placement groove 9, and screw the bolt 12 through the filter basket 11 and the through hole 13 into the fixing hole 14. This will fix the position of the filter basket 11 in the placement groove 9 on the extraction head 8. At the same time, the filter basket 11 will compress the sealing gasket 10, thereby improving the sealing between the filter basket 11 and the extraction head 8. By unscrewing the bolt 12, the filter basket 11 can be removed from the placement groove 9 for maintenance.

[0030] Preferably, a threaded ring 15 is connected to the top surface of the extraction head 8, and one end of the threaded ring 15 is connected to a threaded groove 16. The threaded groove 16 is opened on the bottom surface of the gas extraction pipe 1.

[0031] In practical use, the threaded ring 15 on the extraction head 8 can be screwed into the threaded groove 16 at the bottom of the gas extraction pipe 1, so that the extraction head 8 can be fixed at the bottom of the gas extraction pipe 1. By twisting the extraction head 8 in the opposite direction, the threaded ring 15 can be separated from the threaded groove 16, so that the extraction head 8 can be removed from the gas extraction pipe 1.

[0032] Preferably, a sealing ring 17 is connected around the outer surface of the bottom end of the threaded ring 15, and one end of the sealing ring 17 is engaged inside the sealing groove 18, which is located on the inner surface of the bottom end of the threaded groove 16.

[0033] In practical use, the sealing ring 17 is made of nitrile rubber. When the threaded ring 15 on the extraction head 8 is screwed into the threaded groove 16 at the bottom of the gas extraction pipe 1, the threaded ring 15 will also move the sealing ring 17 to the position of the sealing groove 18. At this time, the sealing ring 17 will be elastically engaged in the sealing groove 18 to ensure the sealing between the threaded ring 15 and the gas extraction pipe 1.

[0034] Working principle: When using this negative pressure adaptive gas extraction and sealing device, first insert the gas extraction pipe 1 into the borehole to be extracted. At this time, the high-pressure airbag 2 on the gas extraction pipe 1 will enter the borehole. Then, start the air pump 5, allowing the connecting pipe 4 connected to the output end of the air pump 5 to inflate the high-pressure airbag 2 through the air guide pipe 3. This causes the high-pressure airbag 2 to gradually expand and tightly adhere to the inner wall of the borehole. When the pressure inside the high-pressure airbag 2 reaches the preset value, close the explosion-proof solenoid valve 7 and the air pump 5, thus completing the initial sealing operation. The operator can then connect a pipeline to one end of the gas extraction pipe 1 to perform gas extraction. At this time, the pressure sensor 6 on the air guide pipe 3 immediately enters real-time monitoring mode, continuously tracking the pressure changes inside the high-pressure airbag 2 and transmitting the data uninterruptedly to the PLC. When the borehole deforms due to mining stress and ground stress, the external pressure on the high-pressure airbag 2 changes, directly reflected in the pressure value within the connecting pipe 4. When the pressure sensor 6 detects abnormal pressure fluctuations, it quickly sends a signal to the PLC control switch. The PLC control switch, according to a preset program, immediately issues commands to control the operation of the air pump 5 and the explosion-proof solenoid valve 7. If the pressure value is lower than the set threshold, it indicates that a gap has appeared in the high-pressure airbag 2 due to borehole deformation. In this case, the air pump 5 is started and the explosion-proof solenoid valve 7 is opened, replenishing gas into the high-pressure airbag 2 through the connecting pipe 4 and the air guide pipe 3, causing it to expand again and fill the gap. If the pressure value is higher than the threshold, the air pump 5 is started again and the explosion-proof solenoid valve 7 is opened again, allowing gas to be drawn from the input end of the air pump 5 into the high-pressure airbag 2 through the connecting pipe 4 and the air guide pipe 3, preventing excessive internal pressure and damage to the high-pressure airbag 2. This setup enables adaptive deformation adjustment of the high-pressure airbag 2, continuously ensuring the sealing of the borehole and preventing the infiltration of external air. Drilling can affect the negative pressure stability of the extraction system. Secondly, the extraction head 8 is screwed into the threaded groove 16 at the bottom of the gas extraction pipe 1 using a threaded ring 15. The threaded ring 15 will also move with the sealing ring 17 to the position of the sealing groove 18. At this time, the sealing ring 17 will be elastically engaged in the sealing groove 18 to ensure the sealing between the threaded ring 15 and the gas extraction pipe 1. In this way, when the operator performs gas extraction through the gas extraction pipe 1, the gas will first pass through the extraction head 8 and then enter the gas extraction pipe 1. The filter basket 11 in the extraction head 8 will filter and intercept impurities in the gas, preventing impurities from being extracted along with the gas, thereby improving the quality of gas extraction and facilitating subsequent gas utilization.

[0035] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are 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 negative pressure adaptive gas extraction sealing device, comprising a gas extraction pipe (1), characterized in that: A high-pressure airbag (2) is connected to the outer surface of the bottom end of the gas extraction pipe (1). A gas guide pipe (3) is connected to the top surface of the high-pressure airbag (2). The other end of the gas guide pipe (3) is connected to the connecting pipe (4). One end of the connecting pipe (4) is connected to the output end of the air pump (5), and the other end of the connecting pipe (4) is connected to the input end of the air pump (5). A pressure sensor (6) is connected to the outer surface of one end of the connecting pipe (4), and an explosion-proof solenoid valve (7) is connected through the other end of the connecting pipe (4). An extraction head (8) is connected to the bottom surface of the gas extraction pipe (1). A placement groove (9) is opened on the top surface of the extraction head (8). A filter basket (11) is slidably placed inside the placement groove (9). A sealing gasket (10) is placed between the filter basket (11) and the placement groove (9). The sealing gasket (10) is slidably connected to the extraction head (8) through the placement groove (9).

2. The negative pressure adaptive gas extraction sealing device according to claim 1, characterized in that: The internal space of the air duct (3) is connected to the internal space of the high-pressure airbag (2).

3. The negative pressure adaptive gas extraction sealing device according to claim 1, characterized in that: The air pump (5), pressure sensor (6) and explosion-proof solenoid valve (7) are electrically connected to an external power supply via a PLC control switch.

4. The negative pressure adaptive gas extraction sealing device according to claim 1, characterized in that: The top surface of the filter basket (11) is connected to a bolt (12), one end of which is connected to a through hole (13) opened on the top surface of the sealing gasket (10), and the other end of the bolt (12) is connected to a fixing hole (14) in a threaded connection. The fixing hole (14) is opened on the bottom surface of the placement groove (9).

5. The negative pressure adaptive gas extraction sealing device according to claim 1, characterized in that: The top surface of the extraction head (8) is connected to a threaded ring (15), one end of which is connected to a threaded groove (16), which is located on the bottom surface of the gas extraction pipe (1).

6. The negative pressure adaptive gas extraction sealing device according to claim 5, characterized in that: A sealing ring (17) is connected around the outer surface of the bottom end of the threaded ring (15). One end of the sealing ring (17) is engaged inside the sealing groove (18). The sealing groove (18) is opened on the inner surface of the bottom end of the threaded groove (16).

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