CN216043860U - Gas extraction device - Google Patents

Abstract

The invention discloses a gas extraction device, which comprises an extraction head and an extraction pipe; the extraction head comprises a double-layer reducing cross joint, a built-in bent pipe is arranged in the double-layer reducing cross joint, the extraction pipe comprises a pipe body and a plug, the pipe body comprises an inner pipe and an outer pipe which are concentrically arranged and separated from each other, a gas channel is formed between the inner pipe and the outer pipe, and a plurality of gas collecting holes are formed in the outer pipe; the pipe body is detachably connected to one end, provided with an internal bent pipe, of the double-layer reducing four-way, the end extends out of the internal bent pipe, the internal bent pipe is communicated with the inner pipe to form a gas channel, and the gas channel is communicated with the inner space of the double-layer reducing four-way; one end of the pipe body, which is far away from the double-layer reducing cross joint, is provided with a connecting socket, and the plug can be movably inserted into the connecting socket. Adopt the device in this practicality, can effectively solve the technical problem that drilling construction volume is big and gas drainage difficulty.

Description

Gas extraction device

Technical Field

The invention belongs to the technical field of mining, and particularly relates to a gas extraction device.

Background

Along with the continuous improvement of the mechanization degree of a coal mine, the production capacity and the production efficiency of the coal mine are increased, and serious potential safety hazards such as gas overrun and coal and gas outburst bring great threats to property and personal safety of the coal mine. In order to eliminate the potential safety hazard of gas, gas extraction is required. In gas extraction, downward borehole extraction is difficult. The current successful downlink borehole extraction method comprises the following steps: and (3) after the drill rod drills to the designed position, withdrawing the drill rod, and sealing holes by adopting a mode of 'casing pipe and water blowing pipe' in the whole process. The 'sleeve and water blowing pipe' means that one water blowing pipe is arranged on one side of the sleeve so as to blow out accumulated water and drill cuttings in a drill hole; and connecting one side of the sleeve close to the orifice with a main gas extraction pipeline for extraction.

The existing down-hole drilling 'compressed air and water blowing' pipe discharging process is that after a drilling construction is finished and a rod is withdrawn, a 4-branch rubber pipe is installed and is discharged into the bottom of a drilling hole along with a drawing and discharging pipe during hole sealing. The 4-branch rubber pipe is wound and fixed outside the gas drainage pipe, so that the aperture of the drilled hole is increased, the drilling construction amount is increased, and the drilling construction cost is increased. And when the sleeve is pumped back and forth in the pore channel, the 4-branch rubber pipe is easy to bend and deform, the back and forth pumping construction difficulty is increased, and the resistance is applied to the air-pressing and water-blowing process, so that the water-blowing effect is influenced, and the gas extraction quality is influenced.

Disclosure of Invention

Aiming at the prior art, the invention provides a gas extraction device, which aims to solve the technical problems of large drilling construction quantity and difficult gas extraction.

In order to achieve the purpose, the invention adopts the technical scheme that: the gas extraction device comprises an extraction head and an extraction pipe; the extraction head comprises a double-layer reducing cross joint, the double-layer reducing cross joint comprises an outer sleeve and a built-in bent pipe, an air inlet and a water outlet are arranged on the outer sleeve in a staggered mode, one end of the built-in bent pipe is connected with the air inlet, and the other end of the built-in bent pipe is flush with the end portion of the outer sleeve; the extraction pipe comprises a pipe body and a plug, the pipe body comprises an inner pipe and an outer pipe which are concentrically arranged and separated from each other, a gas channel is formed between the inner pipe and the outer pipe, and a plurality of gas collecting holes are formed in the outer pipe; the pipe body is detachably connected to one end, provided with an internal bent pipe, of the double-layer reducing four-way, the internal bent pipe is communicated with the inner pipe to form a gas channel, and the gas channel is communicated with the inner space of the double-layer reducing four-way; one end of the pipe body, which is far away from the double-layer reducing cross joint, is provided with a connecting socket, and the plug can be movably inserted into the connecting socket.

This practicality adopts above-mentioned technical scheme's beneficial effect is: the extraction device in the utility model comprises an extraction head and an extraction pipe which are matched with each other. The gas extraction head is a reducing cross joint and is provided with four different connectors, external equipment with different functions such as inflation, drainage and gas extraction can be integrated together, the purposes such as water blowing, drainage and gas extraction can be achieved through one set of device, the gas extraction flow is simplified, and the gas extraction is safer and more efficient. The internal elbow in the reducing cross divides the internal space of the reducing cross into two different fluid passages, and different types of fluids flow in the two passages, so that the purpose of gas extraction is achieved. The pipe of taking out in this practicality is two-layer sleeve structure, with take out the first back of being connected, can take out the inside fluid passage who forms many intercommunications of device, need not additionally when carrying out gas drainage and take out the outside blowing pipe of tying up of gas drainage pipe, takes out the whole size of taking out the pipe and reduces, consequently can correspondingly reduce the diameter of drilling, drilling work load can reduce.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the outer sleeve and the inner bend are integrally formed.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: the double-layer reducing cross joint is manufactured in an integrated forming mode, the obtained product is a complete whole body, the connection weak point does not exist, the strength of the double-layer reducing cross joint is higher, fluid leakage in the working process can be effectively avoided, and the safety performance is better.

Furthermore, a drain valve is arranged at the water outlet, and a drain scale joint is arranged at the water outlet end of the drain valve.

Furthermore, an air inlet bent pipe is connected to the air inlet, an air inlet valve is arranged on the air inlet bent pipe, and an air inlet fish scale joint is arranged at the air inlet end of the air inlet valve.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: this practicality sets up control flap on corresponding pipeline, controls fluidic flow direction and state through opening and shutting of valve. The fish scale joint is arranged at the tail end of the valve, so that the pipeline is more firmly connected with other components, and the connection stability and the air tightness can be ensured.

Further, a negative pressure valve is arranged at one end of the double-layer reducing four-way joint, which is far away from the extraction pipe, and a negative pressure fish scaling joint is arranged at the air outlet end of the negative pressure valve; a support strip is arranged between the air inlet bent pipe and the negative pressure valve.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: when air is blown, the device swings greatly due to large pressure, the air inlet bent pipe swings for a long time and is easy to damage, and the relative movement between the devices is reduced after the supporting strips are added, so that the service life of the device is longer.

Further, a concentration detection port is arranged on the double-layer reducing cross joint and is provided with a plugging bolt.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: this practicality sets up the concentration detection mouth on double-deck reducing cross, can detect gas drainage concentration at any time through this detection mouth.

Further, the inner pipe is fixed inside the outer pipe through an inner pipe supporting ring; the inner pipe support ring comprises an outer ring, an inner ring and a support block for connecting the outer ring and the inner ring, the outer ring is fixed on the inner wall of the outer pipe, and the inner pipe penetrates through the inner ring.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: the inner pipe support ring is used for stably fixing the inner pipe inside the outer pipe, so that the inner pipe and the outer pipe are separated from each other and form a gas channel, two different fluid passages are formed inside the inner pipe and the gas channel, and the purposes of drainage and gas extraction can be achieved by controlling the opening and closing states of different valves.

Furthermore, a plurality of groups of anti-skid grooves are arranged on the outer surface of the outer pipe, and each group of anti-skid grooves comprises two annular grooves; the inner wall of the outer pipe is provided with a baffle ring opposite to the annular groove, and the outer ring is fixed between the baffle rings.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: the anti-slip groove is formed in the surface of the outer pipe, so that the extraction pipe cannot slip when being connected, and the connection stability and the connection tightness can be guaranteed. Set up at the outer tube inner wall and keep off the ring, two keep off and form spacing draw-in groove between the ring, the outer lane clamps in spacing draw-in groove, not only connects more stably, in the course of the work in addition, even receive big vibration, the skew can not take place yet in the inner tube support ring, can guarantee that the fluid is carried smoothly.

Further, the body is formed by connecting a plurality of tube joints end to end, and the tube joint afterbody is provided with the connection bellmouth.

This practicality adopts above-mentioned further technical scheme's beneficial effect to be: the pipe body of the extraction pipe is formed by connecting a plurality of pipe joints, the number of the pipe joints can be flexibly controlled according to the depth of a well, and gas in bottom layers with different depths can be extracted.

The invention has the beneficial effects that: this practicality will take out the gas drainage pipe and set to the bilayer, and the body is inside to have two different fluid passage, can realize aerifing through a pipeline, operations such as drainage, gas drainage, avoid additionally increasing the pipeline, and not only the operation is more simple and convenient, takes out the whole size reduction of taking out the gas drainage pipe moreover, only needs the drilling of less diameter to take out the gas drainage, has reduced the drilling degree of difficulty and work load. The extraction head is provided with a plurality of passages and can be connected with different functional devices, so that water blowing and gas extraction operations can be carried out quickly and efficiently.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a front view of a double-layer reducing cross;

FIG. 3 is a cross-sectional view of a double-layer reducing cross-joint;

FIG. 4 is a front view of an extraction pipe;

FIG. 5 is a cross-sectional view of a drainage tube;

FIG. 6 is a schematic view of the connection of the extraction head to other piping;

FIG. 7 is a front view of the inner tube support ring;

FIG. 8 is a front view of a pipe section;

FIG. 9 is a schematic diagram of a gas extraction operation performed by the present apparatus;

FIG. 10 is a schematic diagram of the operation of draining water using the present invention;

wherein, 1, extracting head; 101. an outer sleeve; 102. an air inlet pipe; 103. a water outlet pipe; 104. a bent pipe is arranged inside; 105. a concentration detection port; 106. an air inlet bent pipe; 107. an intake valve; 108. carrying out air inlet fish scaling; 109. a drain valve; 110. draining water and scaling; 111. a negative pressure valve; 112. carrying out negative pressure fish scaling; 113. a supporting strip;

2. extracting pipes; 201. a pipe body; 202. a plug; 203. a gas collection hole; 204. connecting the bellmouth; 205. an anti-slip groove; 206. an outer tube; 207. an inner tube; 208. a gas passage; 209. a baffle ring; 210. pipe joints;

3. an inner tube support ring; 301. an outer ring; 302. an inner ring; 303. a support block;

I. positive pressure air; II. Water accumulation; III, gas.

Detailed Description

The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.

In the embodiment of the present application, as shown in fig. 1 to 10, a gas extraction device is provided. The overall structure of the gas extraction device is shown in fig. 1, and the gas extraction device comprises an extraction head 1 and an extraction pipe 2. The extraction head 1 comprises a double-layer reducing cross joint, as shown in fig. 2 and 3, the double-layer reducing cross joint comprises an outer sleeve 101 and a built-in bent pipe 104, and an air inlet 102 and an water outlet 103 communicated with the outer sleeve 101 are arranged on the outer sleeve 101 in a staggered mode; the air inlet 102 and the water outlet 103 are staggered as shown in fig. 2, the air inlet and the water outlet are positioned at two sides of the outer sleeve 101, and the central lines of the air inlet and the water outlet are not coincident; the inner bend 104 is a right angle bend with one end sealingly connected to the air inlet 102 and the other end extending to and flush with the end of the outer sleeve 101, and the inner bend 104 is concentric with the outer sleeve 101. The outer sleeve 101 and the inner bend 104 are made of high-strength plastic and can be connected by a sealant, but in order to ensure the overall stability and sealing performance of the device, it is preferable to integrally form the outer sleeve 101 and the inner bend 104. In order to facilitate monitoring of the gas concentration in the gas extraction process, a concentration detection port 105 is formed in the outer casing 101, the concentration detection port 105 is a threaded through hole and is provided with a plugging bolt, the plugging bolt is screwed in the concentration detection port 105 in the gas extraction process, and when the concentration needs to be monitored, the plugging bolt is unscrewed, so that the gas concentration can be detected.

As shown in fig. 4 and 5, the extraction pipe 2 of the present invention includes a pipe body 201 and a plug 202. The pipe body 201 comprises an inner pipe 207 and an outer pipe 206 which are concentrically arranged and separated from each other, a gas channel 208 is formed between the inner pipe 207 and the outer pipe 206, a plurality of gas collecting holes 203 are formed in the outer pipe 206, and the gas collecting holes 203 are circular or quincunx. The extraction pipe 2 is made of high-strength plastic, and in order to ensure the stability of the inner pipe 207 in the outer pipe 206, the inner pipe support ring shown in fig. 7 is used for connecting the inner pipe 207 and the outer pipe 206. The inner pipe support ring 3 comprises an outer ring 301, an inner ring 302 and a support block 303 which is integrally formed and is used for connecting the outer ring 301 and the inner ring 302; the width of outer lane 301 is 1 ~ 5cm, and its external diameter is equivalent with the internal diameter of outer tube 206, and the width of inner circle 302 is 1 ~ 5cm, and its internal diameter is equivalent with the external diameter of inner tube 207, and supporting shoe 303 is provided with 2 ~ 4, and equidistant distribution is between outer lane 301 and inner circle 302, is fluid passage between the supporting shoe 303. When the device is installed, the outer ring 301 is fixed on the inner wall of the outer tube 206, and the inner tube 207 passes through the inner ring 302.

In a preferred embodiment of the present invention, as shown in fig. 4 and 5, a plurality of sets of anti-slip grooves 205 are provided on the outer surface of the outer tube 206, each set of anti-slip grooves 205 includes two annular grooves, and the distance between the two annular grooves is equal to the width of the outer ring 301 in the inner tube support ring 3. The inner wall of the outer tube 206 is provided with a retaining ring 209 opposite to the annular groove, and the outer ring 301 is fixed between the retaining rings 209.

In a further preferred embodiment of the present invention, the pipe body 201 is formed by connecting a plurality of pipe joints 210 with a length of 1-10 m end to end, the connection mode is socket connection or direct connection, and when the socket connection is adopted, a connection socket 204 is disposed at the tail of the pipe joint 210.

As shown in fig. 1, the pipe body 201 is detachably connected to the end of the double-layer reducing cross with the extended built-in elbow 104 in a manner of inserting, etc., the outer diameter of the outer pipe 206 at the end where the pipe body 201 is connected to the double-layer reducing cross is equivalent to the inner diameter of the outer casing 101, the outer diameter of the inner pipe 207 is equivalent to the inner diameter of the built-in elbow 104, and after the pipe body 201 is inserted into the double-layer reducing cross, a tight fit can be formed, and a good connection sealing effect can be achieved by adding a small amount of sealant. After the pipe body 201 is connected with the double-layer reducing four-way, the built-in bent pipe 104 is communicated with the inner pipe 207 to form a gas channel, and the gas channel 208 is communicated with the inner space of the double-layer reducing four-way. One end of the pipe body 201, which is far away from the double-layer reducing cross, is provided with a connecting bell mouth 204, and the connecting bell mouth 204 is formed by flaring; the plug 202 is a tapered housing that can be removably inserted into the connection socket 204, and after insertion, a cavity is formed at the end of the tube 201.

The double-layer reducing cross joint in the gas extraction device is connected with multiple functional external devices to perform operations such as inflation, drainage, gas extraction and the like. In order to facilitate connection with other devices and control the flow direction of fluid, as shown in fig. 6, a drain valve 109 is arranged at the water outlet 103 on the double-layer reducing cross, and a drain scale 110 is arranged at the water outlet end of the drain valve 109; an air inlet bent pipe 106 is connected to an air inlet 102 on the double-layer reducing four-way joint, an air inlet valve 107 is arranged on the air inlet bent pipe 106, and an air inlet fish scaling 108 is arranged at the air inlet end of the air inlet valve 107; one end of the double-layer reducing four-way joint, which is far away from the extraction pipe 2, is provided with a negative pressure valve 111, and the air outlet end of the negative pressure valve 111 is provided with a negative pressure fish scaling joint 112; wherein, the air inlet valve 107, the drain valve 109 and the negative pressure valve 111 are all ball valves; a support strip 113 is arranged between the inlet manifold 106 and the vacuum valve 111.

The gas flow direction when utilizing this practical gas drainage device to take out gas drainage is as shown in fig. 9, specifically the operation as follows:

under the condition that gas extraction is normal, the gas inlet valve 107 and the drain valve 109 are both in a closed state, the negative pressure valve 112 is opened, negative pressure is applied to the extraction head 1 and the extraction pipe 2 at the moment, gas III in the coal seam is extracted into the gas channel 208 by negative pressure through the gas collecting hole 203 on the outer pipe 206 in the extraction pipe 2 and then enters the double-layer reducing cross joint, and then enters the gas extraction main pipeline connected to the negative pressure fish scaling joint 112 through the negative pressure valve 111, so that gas extraction is completed.

When more accumulated water exists in the extraction pipe 2 and the monitoring personnel find that the extraction concentration is insufficient through the detection port 105, the monitoring personnel immediately close the negative pressure valve 111, open the drain valve 109 and finally open the air inlet valve 107. Introducing positive pressure air I into the extraction device through an inflation device, wherein the positive pressure air I sequentially passes through the air inlet elbow 106, the air inlet 102, the built-in elbow 104, the inner pipe 207 and the plug 204 and turns in the plug 204 to enter the gas channel 208, accumulated water II in the extraction pipe 2 is discharged through the gas channel 208, the double-layer reducing cross joint and the water outlet 103 until the accumulated water is discharged, and the water blowing process is as shown in FIG. 10.

While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims (9)

1. The utility model provides a gas drainage device which characterized in that: comprises an extraction head (1) and an extraction pipe (2); the extraction head (1) comprises a double-layer reducing cross joint, the double-layer reducing cross joint comprises an outer sleeve (101) and a built-in bent pipe (104), an air inlet (102) and a water outlet (103) are arranged on the outer sleeve (101) in a staggered mode, one end of the built-in bent pipe (104) is connected with the air inlet (102), and the other end of the built-in bent pipe is flush with the end part of the outer sleeve (101); the extraction pipe (2) comprises a pipe body (201) and a plug (202), the pipe body (201) comprises an inner pipe (207) and an outer pipe (206) which are concentrically arranged and separated from each other, a gas channel (208) is formed between the inner pipe (207) and the outer pipe (206), and a plurality of gas collecting holes (203) are formed in the outer pipe (206); the pipe body (201) is detachably connected to one end, extending out, of the double-layer reducing cross joint, wherein a built-in bent pipe (104) is arranged on the double-layer reducing cross joint, the built-in bent pipe (104) is communicated with an inner pipe (207) to form a gas channel, and the gas channel (208) is communicated with the inner space of the double-layer reducing cross joint; one end, far away from the double-layer reducing cross, of the pipe body (201) is provided with a connecting socket (204), and the plug (202) can be movably inserted into the connecting socket (204).

2. The gas extraction device according to claim 1, wherein: the outer sleeve (101) and the inner bend (104) are integrally formed.

3. The gas extraction device according to claim 1, wherein: a drain valve (109) is arranged at the water outlet (103), and a drain scale joint (110) is arranged at the water outlet end of the drain valve (109).

4. The gas extraction device according to claim 1, wherein: air inlet (102) department is connected with air inlet elbow (106), be provided with air intake valve (107) on air inlet elbow (106), the air inlet end of air intake valve (107) is provided with air inlet fish scale and connects (108).

5. The gas extraction device according to claim 4, wherein: one end of the double-layer reducing four-way joint, which is far away from the extraction pipe (2), is provided with a negative pressure valve (111), and the air outlet end of the negative pressure valve (111) is provided with a negative pressure fish scaling joint (112); and a support strip (113) is arranged between the air inlet bent pipe (106) and the negative pressure valve (111).

6. The gas extraction device according to claim 1, wherein: the double-layer reducing four-way joint is provided with a concentration detection port (105), and the concentration detection port (105) is provided with a plugging bolt.

7. The gas extraction device according to claim 1, wherein: the inner pipe (207) is fixed inside the outer pipe (206) through an inner pipe supporting ring (3); the inner pipe supporting ring (3) comprises an outer ring (301), an inner ring (302) and a supporting block (303) connected with the outer ring (301) and the inner ring (302), the outer ring (301) is fixed on the inner wall of the outer pipe (206), and the inner pipe (207) penetrates through the inner ring (302).

8. The gas extraction device according to claim 7, wherein: the outer surface of the outer pipe (206) is provided with a plurality of groups of anti-skid grooves (205), and each group of anti-skid grooves (205) comprises two annular grooves; the inner wall of the outer pipe (206) is opposite to the annular groove, a retaining ring (209) is arranged at the annular groove, and the outer ring (301) is fixed between the retaining rings (209).

9. The gas extraction device according to claim 1, wherein: the pipe body (201) is formed by connecting a plurality of pipe joints (210) end to end, and a connecting socket (204) is arranged at the tail part of each pipe joint (210).

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