CN201258756Y - Telescopic type hole packer for coal mine downhole - Google Patents

Abstract

The utility model discloses a retractable hole sealing device for water injection, dust prevention and gas drainage of underground coal seams in coal mines, comprising: Diameter screws are connected to the end seats at both ends, and the inner tube is spiraled inside. Because the utility model adopts the spiral inner tube structure, when the outer casing radially expands under the action of high-pressure water and is in close contact with the coal seam, the inner tube shrinks along the axial direction of the outer casing along with the outer casing, which can realize pre-sealing Water injection after the hole has a good sealing effect. It also has the characteristics of simple structure, convenient carrying and operation, and wide application. It can be applied to both water injection and gas drainage sealing.

Description

A retractable hole sealing device for underground coal mine

technical field

The utility model belongs to the field of coal mine production, and relates to a retractable hole sealing device used for water injection and dust prevention and gas drainage of underground coal seams in coal mines.

technical background

With the rapid development of the coal industry and the mechanization of coal mine production, the problem of dust damage in coal mine production is still severe. The incidence of pneumoconiosis among coal miners is relatively high, and coal dust explosions occur from time to time. Coal and gas outburst is a serious problem in coal mines. Natural disasters seriously restrict the safe production of coal mines. Coal seam water injection is one of the more advanced measures to solve the problem of dust pollution. Gas drainage in advance is an effective method to solve coal and gas outburst. Both coal seam water injection and gas drainage need to be sealed. The currently used sealing methods mainly include cement mortar sealing method, polyurethane sealing method and hole sealing device sealing method. The cement mortar sealing method is labor-intensive, low in efficiency, and the sealing effect is poor. After the water injection steel pipe is buried, it cannot be retrieved, leaving hidden dangers for coal mining operations; the polyurethane sealing method has low sealing strength and short sealing distance. Air leakage; the inner pipe of the hole sealer used in the ordinary hole sealing method is also made of steel pipe, and the two ends of the outer casing are fixed on the water injection steel pipe. When the pressure is sealed, the outer casing expands longitudinally and shrinks axially, which is easy The connection between the outer casing and the water injection steel pipe is broken, the hole sealing device is damaged, and the hole sealing effect cannot be achieved.

Contents of the invention

The purpose of this utility model is to provide a kind of inner pipe that can expand and contract axially with the outer casing, can realize sealing first and then injecting water, has a simple structure, is easy to carry and operate, and is suitable for both coal seam water injection sealing and gas drainage sealing A retractable hole sealer for underground coal mines.

In order to achieve the above object, the utility model includes an end seat with a through hole, an outer sleeve, an inner tube, a long-diameter screw, and an auxiliary water injection pipe connected with the through hole on the end seat. The inner pipe is connected with the end seats at both ends through long-diameter screws, and a pressurized chamber is formed between the inner pipe, the outer casing and the end seats at both ends, and the pressurized chamber communicates with the auxiliary water injection pipe.

The inner tube in the utility model adopts a high-pressure resistant rubber tube, which is arranged in a spiral shape and has a certain degree of elasticity. When the outer casing expands and seals the hole in the longitudinal direction under the action of pressure water, the inner tube can follow the outer casing. The tube shrinks axially. The pressure water of the outer casing is provided by an independent pressure supply device, which can seal the hole immediately after drilling, and then inject water or drain the gas after sealing, and the sealing effect has nothing to do with whether water is injected or not, and the pressure of water injection.

The working principle of the utility model is as follows: when in use, put the hole sealing device into the predetermined position in the borehole, connect the auxiliary water injection pipe with the independent pressure water pump, and the pressure water enters the pressurization chamber through the auxiliary water injection pipe, when the specified pressure is reached At this time, the outer casing will expand rapidly, and the diameter of the pipe will increase while the axial direction will shorten. With the help of the large frictional resistance generated by the rubber material, the outer casing of the hole sealer will be tightly attached to the coal seam hole wall to achieve hole sealing. For the coal seam water injection operation, after sealing the hole, connect the high-pressure water injection pipeline to the through hole of the seat for water injection operation, whether continuous water injection or intermittent water injection will not affect the sealing effect; for gas drainage operations, after sealing the hole, the The gas drainage system is connected with the sitting through hole for gas drainage operation. When the operation is completed, open the pipe valve on the auxiliary water injection pipe to release the pressure water in the pressurized chamber, and the hole sealer will recover to its original state under the action of its own recovery ability, and can be taken out from the borehole for repeated use.

Because the utility model adopts the spiral inner tube structure, when the outer casing radially expands under the action of high-pressure water and comes into close contact with the coal seam, the inner tube shrinks axially along with the outer casing along the outer casing, which can realize pre-sealing Water injection after the hole has a good sealing effect. It also has the characteristics of simple structure, convenient carrying and operation, and wide application. It can be applied to both water injection and gas drainage sealing.

Description of drawings:

Fig. 1 is a schematic diagram of a half-section structure of the utility model.

Detailed ways:

As can be seen from Fig. 1, the utility model includes an end seat 1 with a through hole, an outer casing 2, an inner tube 3, a long-diameter screw 4, and an auxiliary water injection pipe 5 connected to the through hole on the end seat. The inner pipe 3 is connected with the end seats 1 at both ends through long-diameter screws 4, and the end seats 1 are used for connecting a high-pressure water injection system or a gas drainage system. The outer casing 4 is closely connected with the end seat 1 , and a pressurized chamber 6 is formed between the inner tube 3 , the outer casing 4 and the end seats 1 at both ends. The pressurized chamber 6 communicates with the auxiliary water injection pipe 5 . The inner tube 3 adopts a high-pressure resistant rubber tube, and the outer casing 2 adopts rubber.

Claims (3)

1. A retractable hole sealer for underground coal mines, characterized in that it is composed of an end seat (1) with a through hole, an outer casing (2), an inner tube (3), a long-diameter screw (4 ), an auxiliary water injection pipe (5) connected to the through hole on the end seat (1); the inner pipe (3) is connected to the end seats (1) at both ends through a long-diameter screw (4), and the inner pipe ( 3) A pressurized chamber (6) is formed between the outer casing (2) and the end seats at both ends, and the pressurized chamber (6) communicates with the auxiliary water injection pipe (5). 2. The retractable hole sealer for underground coal mines according to claim 1. It is characterized in that: the inner pipe (3) is arranged in a spiral shape. 3. The retractable hole sealer for underground coal mines according to claim 1. It is characterized in that: the inner tube (3) is a high-pressure resistant rubber tube, and the material of the outer casing (2) is rubber.

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