Hole sealing device for gas control

Abstract

The utility model relates to the technical field of gas extraction, in particular to a hole sealing device for gas control, which comprises a gas pipe, a corrugated pipe and an adjusting part, the corrugated pipe is sleeved on the gas pipe, the adjusting part is in threaded connection with the gas pipe, one end of the gas pipe is provided with a baffle, and the corrugated pipe is provided with a plurality of plugging components; a first working area is arranged between the corrugated pipe and the hole wall of the drill hole, a second working area is arranged between the corrugated pipe and the air pipe, and the plugging assembly comprises a plurality of first bags and a plurality of second bags which are fixedly installed on the corrugated pipe. The device has the beneficial effects that by arranging the air pipe, the corrugated pipe, the adjusting piece and the plugging assembly, polyurethane can react and expand in an annular space formed by the corrugated pipe, the sealing ring and the drill hole and an annular space formed by the corrugated pipe and the air pipe, and due to the fact that the polyurethane is blocked by the corrugated pipe and the sealing ring in the axial direction, the polyurethane can expand in the radial direction in the reaction process; and the water permeates into coal seam cracks at the hole wall of the drill hole, so that the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas extraction, in particular to a sealing device for gas management. Background Art

[0002] Coal mine gas is one of the main dangerous factors threatening coal mine safety. In order to eliminate the gas threat during comprehensive mining of coal mines, the method of pre-extraction of gas is generally used to control coal seam gas. For gas extraction, it is generally necessary to seal the hole between the hole mouth and the extraction pipe after drilling the gas extraction hole.

[0003] The coal seam gas extraction sealing device disclosed in the Chinese patent announcement number CN208220708U includes a sealing member, which includes a sealing tube, a first bag and a second bag; the first bag contains polyurethane A liquid, and the second bag contains polyurethane B liquid; the first bag and the second bag are longitudinally bonded to the outer wall of the sealing tube. The sealing member is covered with a puncture assembly, which includes connecting rings, and each connecting ring is connected by a longitudinal rod; a plurality of transverse blades are arranged on the inner side of the longitudinal rod.

[0004] However, compared with the existing technology and the comparative scheme, it can be seen that the coal seam gas extraction sealing device still has the following problems in actual use:

[0005] In order to facilitate insertion into the borehole, the outer diameter of the sealing device needs to be smaller than the borehole diameter. In the prior art, after the sealing device is inserted into the borehole, the purpose of sealing the hole is generally achieved by relying on the chemical reaction and expansion of polyurethane. However, after drilling the gas extraction hole, cracks will appear in the coal seam at the borehole wall due to the drilling. When the polyurethane undergoes a chemical reaction, it will expand along the axial direction of the borehole, making it difficult to penetrate into the coal seam cracks at the borehole wall, so that the gas may leak out along the coal seam cracks at the borehole wall, resulting in poor sealing effect of the sealing device. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background technology, and provide a sealing device for gas management.

[0007] The purpose of the utility model is achieved through the following technical solutions: a sealing device for gas treatment, including an air pipe, a bellows and an adjusting piece, the bellows is sleeved on the air pipe, the adjusting piece is threadedly connected to the air pipe, a baffle is arranged at one end of the air pipe, and a plurality of plugging components are arranged on the bellows; a first working area is between the bellows and the wall of the drilled hole, a second working area is between the bellows and the air pipe, the plugging components include a plurality of first bags and a plurality of second bags fixedly mounted on the bellows, the first bags and the second bags are staggered in the first working area and the second working area, the first bags and the second bags are filled with liquids having an expansion function that undergo a chemical reaction after mixing, and a plurality of cone thorns with a piercing function are fixedly arranged on the inner and outer sides of the bellows.

[0008] Preferably, the bellows is wavy in axial section, and sealing rings are provided at the positions of the wave crests.

[0009] Preferably, a thread is provided at a position of the air pipe corresponding to the adjusting member, and a thread groove matching the thread is provided on the inner wall of the adjusting member.

[0010] Preferably, the chemical liquid inside the first bag is polyurethane A liquid, and the chemical liquid inside the second bag is polyurethane B liquid.

[0011] Preferably, the first bladder bag and the second bladder bag are both located in the same trough of the corrugated tube, and the cone thorns correspond to the positions of the first bladder bag and the second bladder bag.

[0012] Preferably, when the bellows contracts, the cone thorns will pierce the first bag and the second bag, so that the polyurethane A liquid and the polyurethane B liquid mix and chemically react and expand.

[0013] Preferably, the first bladder bag and the second bladder bag are both made of rubber, and have thin walls on the side corresponding to the cone thorn.

[0014] Beneficial effects:

[0015] The sealing device for gas control is provided with an air pipe, a bellows, an adjusting piece and a sealing assembly, so that polyurethane can react and expand in an annular space composed of the bellows, the sealing ring and the borehole, and in an annular space composed of the bellows and the air pipe. Since the polyurethane is blocked by the bellows and the sealing ring in the axial direction, it will expand radially during the reaction and penetrate into the coal seam cracks at the borehole wall, thereby preventing gas from leaking outward along the coal seam cracks at the borehole wall, thereby improving the sealing effect.

[0016] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of the device of the utility model;

[0019] Figure 2 This is a schematic diagram of the first axial side of the bellows of the utility model;

[0020] Figure 3 This is a schematic diagram of the second axial side of the bellows of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the trachea of ​​the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the plugging assembly of the utility model;

[0023] Figure 6 This is a schematic diagram of the state of the utility model bellows before contraction;

[0024] Figure 7 It is a schematic diagram of the state of the bellows of the utility model when it is contracted.

[0025] In the figure: 1. trachea; 2. bellows; 21. sealing ring; 3. adjusting member; 4. baffle; 5. blocking assembly; 51. first bag; 52. second bag; 53. cone; A. first working area; B. second working area. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] Additional aspects and advantages of the present invention will be further described below in conjunction with the accompanying drawings, and some will become apparent from the following description or be learned through practice of the present invention.

[0028] like Figures 1 to 7As shown, a sealing device for gas management includes an air pipe 1, a bellows 2 and an adjusting member 3. The bellows 2 is sleeved on the air pipe 1, and the adjusting member 3 is threadedly connected to the air pipe 1. The air pipe 1 is provided with threads at positions corresponding to the adjusting member 3, and the inner wall of the adjusting member 3 is provided with thread grooves matched with the threads. A baffle 4 is provided at one end of the air pipe 1, and a plurality of sealing components 5 are provided on the bellows 2.

[0029] The first working area is between the bellows 2 and the borehole wall, and the second working area is between the bellows 2 and the trachea 1. The plugging assembly 5 includes a plurality of first bags 51 and a plurality of second bags 52 fixedly mounted on the bellows 2. The first bags 51 and the second bags 52 are alternately arranged in the first working area and the second working area. Figure 5 As shown, the first working area is A, and the second working area is B. The first working area A and the second working area B are staggered on the bellows 2. The first bag 51 and the second bag 52 are filled with liquids that undergo chemical reactions after mixing and have an expansion function. The inner and outer sides of the bellows 2 are fixed with a plurality of cone thorns 53 with a piercing function. The adjusting member 3 is rotated to shrink the bellows 2. As the bellows 2 continues to shrink, the cone thorns 53 on the bellows 2 will pierce the first bag 51 and the second bag 52, and then the chemical liquids inside the first bag 51 and the second bag 52 will be mixed.

[0030] As a preferred technical solution of the utility model, the bellows 2 is wavy in axial section, and sealing rings 21 are provided at the positions of the wave crests.

[0031] As a preferred technical solution of the utility model, the chemical liquid inside the first bag 51 is polyurethane A liquid, and the chemical liquid inside the second bag 52 is polyurethane B liquid. The first bag 51 and the second bag 52 are both located in the same trough of the bellows 2, and the cone thorns 53 correspond to the positions of the first bag 51 and the second bag 52. When the bellows 2 contracts, the cone thorns 53 will pierce the first bag 51 and the second bag 52, so that the polyurethane A liquid and the polyurethane B liquid mix to undergo a chemical reaction and expand. The polyurethane reacts and expands in the annular space composed of the bellows 2, the sealing ring 21 and the drill hole, and the annular space composed of the bellows 2 and the trachea 1. Since the polyurethane is blocked axially by the bellows 2 and the sealing ring 21, it will expand radially during the reaction (the chemical reaction and expansion of the polyurethane A liquid and the polyurethane B liquid mixed in this article is a well-known technology, so its specific components are not described).

[0032] As a preferred technical solution of the utility model, the first bag 51 and the second bag 52 are both made of rubber, and the side corresponding to the cone thorn 53 is thin-walled, so that the first bag 51 and the second bag 52 are easily punctured when they come into contact with the cone thorn 53.

[0033] The working process is as follows:

[0034] S1. When in use, after inserting the device into the borehole, rotate the adjusting member 3 to shrink the bellows 2. At this time, the sealing ring 21 will abut against the inner wall of the borehole, thereby dividing the borehole into annular spaces;

[0035] S2, as the bellows 2 continues to shrink, the thorns 53 on the bellows 2 will puncture the first bag 51 and the second bag 52;

[0036] S3, when the first bag 51 and the second bag 52 are punctured, the polyurethane A liquid and the polyurethane B liquid will automatically flow out and mix to undergo a chemical reaction and expand;

[0037] S4. Polyurethane reacts and expands in the annular space composed of the bellows 2, the sealing ring 21 and the borehole, and the annular space composed of the bellows 2 and the air pipe 1. Since it is blocked by the bellows 2 and the sealing ring 21 in the axial direction, the polyurethane will expand radially during the reaction and penetrate into the coal seam cracks at the borehole wall, preventing gas from leaking outward along the coal seam cracks at the borehole wall, thereby improving the sealing effect.

[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A sealing device for gas management, characterized in that: It comprises an air pipe (1), a bellows (2) and an adjusting member (3), wherein the bellows (2) is sleeved on the air pipe (1), the adjusting member (3) is threadedly connected to the air pipe (1), a baffle (4) is provided at one end of the air pipe (1), and a plurality of blocking components (5) are provided on the bellows (2); The first working area is between the bellows (2) and the wall of the drilled hole, and the second working area is between the bellows (2) and the trachea (1). The blocking assembly (5) comprises a plurality of first bags (51) and a plurality of second bags (52) fixedly mounted on the bellows (2). The first bags (51) and the second bags (52) are arranged alternately in the first working area and the second working area. The first bags (51) and the second bags (52) are filled with liquids that undergo a chemical reaction after mixing and have an expansion function. A plurality of cone spikes (53) with a piercing function are fixedly arranged on the inner side and the outer side of the bellows (2).

2. A sealing device for gas treatment according to claim 1, characterized in that: The bellows (2) is wavy in shape when viewed in axial section, and sealing rings (21) are provided at the positions of the wave crests.

3. A sealing device for gas treatment according to claim 1, characterized in that: The air pipe (1) is provided with a thread at a position corresponding to the adjusting member (3), and the inner wall of the adjusting member (3) is provided with a thread groove matching the thread.

4. A sealing device for gas treatment according to claim 1, characterized in that: The chemical liquid inside the first bag (51) is polyurethane A liquid, and the chemical liquid inside the second bag (52) is polyurethane B liquid.

5. A sealing device for gas treatment according to claim 4, characterized in that: The first bag (51) and the second bag (52) are both located in the same wave valley of the corrugated tube (2), and the cone thorns (53) correspond to the positions of the first bag (51) and the second bag (52).

6. A sealing device for gas treatment according to claim 5, characterized in that: When the bellows (2) contracts, the cone thorns (53) pierce the first bag (51) and the second bag (52), so that the polyurethane liquid A and the polyurethane liquid B mix and undergo a chemical reaction to expand.

7. A sealing device for gas treatment according to claim 6, characterized in that: The first sac (51) and the second sac (52) are both made of rubber, and have a thin wall on the side corresponding to the cone thorn (53).

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