A pressure-conducting four-way blowout preventer device for borehole construction in coal mines

Abstract

The present invention belongs to the field of coal mines, and relates to a pressure-conducting four-way blowout prevention device for underground drilling construction in coal mines, comprising a four-way main shell, wherein the four-way main shell comprises a first flange, a sealing mechanism pipe body, a large belly space, a transition pipe and a second flange, and the sealing mechanism pipe body is also respectively provided with a first sealing body and a second sealing body; the present invention aims at the problem that the existing orifice blowout four-way is not tightly sealed, resulting in leakage of high-pressure gas, and utilizes a designed pressure conduction mechanism to directly act on the mechanism with the ejected gas, thereby improving the linkage control of the mechanism on the sealing component, and realizing the compaction of the drilling rod by the sealing component; at the same time, the greater the gas pressure ejected in the hole, the greater the force acting on the conduction mechanism, and the better the sealing effect of the sealing component, and finally solves the problem of leakage of high-pressure gas through the drilling rod and the four-way annulus.

Description

Technical Field

[0001] The present invention belongs to the field of coal mines and relates to a pressure-conducting four-way blowout preventer for borehole construction underground in coal mines. Background Art

[0002] During the borehole construction process underground in coal mines, in order to prevent safety accidents caused by the ejection of gas or high-pressure water in the borehole, a four-way blowout preventer is generally installed at the borehole opening. When gas or high-pressure water suddenly ejects from the borehole, a buffer can be formed in the cavity of the blowout preventer, and the gas and water can be drained to the discharge pipeline through the gas and liquid diversion pipes. However, due to the structural limitations of the device, there is always a certain gap between the four-way device and the drill pipe. When the pressure of the gas or water ejected from the borehole exceeds a certain limit value, it will gush out from the gap, resulting in the over-limit of gas in the drill field and posing a major safety hazard. To solve this problem, some four-way blowout preventers are optimized in structure, and sealing components are added inside, which can alleviate the gas gushing volume to a certain extent. However, with the rotation of the drill tool during the drilling process, the actual effect of the sealing components will be greatly reduced. Therefore, the current borehole opening blowout preventer still cannot effectively solve the ejection of high-pressure gas and water during the drilling process, and there is always a safety hazard. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a pressure-conducting four-way blowout preventer for borehole construction underground in coal mines, which realizes the linkage between the ejection pressure of gas or water and the sealing components on the basis of installing the sealing components.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A pressure-conducting four-way blowout preventer for borehole construction underground in coal mines, including a four-way main housing, the four-way main housing includes a first flange, a sealing mechanism pipe body, a large-belly space, a transition pipe and a second flange, and a first sealing body and a second sealing body are respectively arranged inside the sealing mechanism pipe body;

[0005] The first sealing body includes a gasket arranged on the inner shoulder of the sealing mechanism pipe body, a circular rubber gasket and a fourth flange are installed on the gasket along the direction away from the large-belly space of the sealing mechanism pipe body, brushes are respectively arranged at both ends of the circular rubber gasket, and the fourth flange is fixed on the first flange of the four-way main housing through bolts;

[0006] The second sealing body includes a conical rubber gasket, a fixing pin, a retaining ring, a spring, a spring seat, a distance sleeve, a conical extrusion sleeve, a locking nut and a bearing plate installed on the right half of the four-way main housing.

[0007] Optionally, the upper part of the four-way main housing is a gas connection outlet, which is connected to the underground negative pressure pipe in the coal mine and consists of a third flange and a transition pipe; the lower part of the four-way main housing is a return slag water outlet, which consists of a conical hopper-shaped housing and a barbed flange, and drains the slag water in the borehole to the slag water treatment system.

[0008] Optionally, the flange barbs are fixed on the third flange of the four-way main housing by bolts for directly sleeving the negative pressure pipe.

[0009] Optionally, the retaining ring is fixed on the pipe body of the packer mechanism by a fixing pin. Its left annular surface serves as the axial position control end of the conical extrusion sleeve, and its right end surface serves as the spring positioning surface.

[0010] Optionally, one end of the conical rubber pad is placed on the inner surface of the conical extrusion sleeve. The two are in conical surface fit, and one end abuts against the gasket. When the conical extrusion sleeve moves axially to the left, the conical rubber pad radially contracts under the action of the conical surface.

[0011] Optionally, one end of the spring seat is installed on the shoulder of the conical extrusion sleeve to control the other end of the spring. Starting from the spring seat, a distance sleeve and a bearing plate are sequentially sleeved along the central axis direction of the packer mechanism pipe body, and finally axially locked by the locking thread, that is, the conical extrusion sleeve, the spring seat, the distance sleeve, the bearing plate and the locking nut are an integral body for pressure conduction.

[0012] The beneficial effects of the present invention are as follows: The pressure-conducting four-way blowout preventer for coal mine underground drilling construction in the present invention aims at the problem of poor sealing of the existing orifice blowout four-way, resulting in high-pressure gas leakage. By using the designed pressure-conducting mechanism, the ejected gas acts directly on the mechanism, thereby improving the linkage control of the mechanism on the sealing component and realizing the compaction of the sealing component on the drill pipe. At the same time, the greater the gas pressure ejected from the hole, the greater the force acting on the conduction mechanism, and the better the sealing effect of the sealing component, finally solving the problem of high-pressure gas leaking through the annulus between the drill pipe and the four-way.

[0013] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in preferred detail below in conjunction with the drawings, where:

[0015] Figure 1 is the overall schematic diagram of the present invention;

[0016] Figure 2 is the schematic diagram of the four-way main housing of the present invention;

[0017] Figure 3 is the three-dimensional schematic diagram of the four-way main housing of the present invention;

[0018] Figure 4Schematic diagram of the spring seat of the present invention;

[0019] Figure 5 is Figure 1 an enlarged view of B in

[0020] Reference numerals: fourth flange 1, brush 2, annular rubber gasket 3, gasket 4, tapered rubber gasket 5, fixing pin 6, retaining ring 7, spring 8, flange barb 9, spring seat 10, distance sleeve 11, tapered extrusion sleeve 12, four-way main housing 13, locking nut 14, bearing plate 15, first flange 131, packer mechanism tube body 132, conical hopper-shaped housing 133, large-belly space 134, barbed flange 135, third flange 136, transition pipe 137, transition pipe 138, second flange 139. Detailed implementation manners

[0021] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0022] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] Please refer to Figure 1, mainly including a fourth flange 1, a brush 2, an annular rubber gasket 3, a gasket 4, a conical rubber gasket 5, a fixing pin 6, a retaining ring 7, a spring 8, a flange barb 9, a spring seat 10, a distance sleeve 11, a conical extrusion sleeve 12, a four-way main housing 13, a locking nut 14, a bearing plate 15, a first flange 131, a packer mechanism pipe body 132, a conical hopper-shaped housing 133, a large-belly space 134, a barb flange 135, a third flange 136, a transition pipe 137, a transition pipe 138, and a second flange 139.

[0025] The four-way main housing 13 is as Figure 2 shown, and the 3D drawing is as Figure 3 shown. It is an integrally welded part. The channel in the horizontal axis direction is the channel for the drill tool to pass through, and it is composed of a first flange 131, a packer mechanism pipe body 132, a large-belly space 134, a transition pipe 138, and a second flange 139; above the four-way main housing 13 is the gas connection outlet, which is connected to the negative pressure pipe in the coal mine, and is composed of a third flange 136 and a transition pipe 137; below the four-way main housing 13 is the slag return water outlet, which is composed of a conical hopper-shaped housing 133 and a barb flange 135, and drains the slag water in the hole to the slag water treatment system. The large-belly space 134 is mainly used for pressure release and buffering.

[0026] The gasket 4 is installed on the inner shoulder of the packer mechanism pipe body 132 of the four-way main housing 13. Then, a brush 2, an annular rubber gasket 3, and a brush 2 are sequentially installed on the gasket 4 along the packer mechanism pipe body 132 to the left. Finally, it is pressed by the fourth flange 1. The fourth flange 1 is fixed on the first flange 131 of the four-way main housing 13 through bolts, thus forming the first sealing body; the conical rubber gasket 5, the fixing pin 6, the retaining ring 7, the spring 8, the spring seat 10, the distance sleeve 11, the conical extrusion sleeve 12, the locking nut 14, and the bearing plate 15 are installed in the right half of the packer mechanism pipe body 132 of the four-way main housing 13, which is the second sealing body and also the pressure conduction mechanism.

[0027] The retaining ring 7 is fixed on the packer mechanism pipe body 132 through the fixing pin 6. Its left annular surface serves as the axial position control end of the conical extrusion sleeve 12, and its right end surface serves as the spring 8 positioning surface; one end of the conical rubber gasket 5 is placed on the inner surface of the conical extrusion sleeve 12, and the two are in conical surface fit. One end abuts against the gasket 4. When the conical extrusion sleeve 12 moves axially to the left, the conical rubber gasket 5 radially contracts under the action of the conical surface; the 3D drawing of the spring seat 10 is as Figure 4As shown, one end is installed on the shoulder of the conical extrusion sleeve 12. As the other end control of the spring 8, starting from the spring seat, the distance sleeve 11 and the bearing plate 15 are sequentially sleeved along the central axis direction of the packer mechanism pipe body 132, and finally axially locked by the locking thread 14. That is, the conical extrusion sleeve 12, the spring seat 10, the distance sleeve 11, the bearing plate 15 and the locking nut 14 are an integral pressure conduction unit. When gas or high-pressure water in the hole ejects, the gas or high-pressure water pressure will be applied to the bearing plate 15, thereby driving the integral pressure conduction unit to move, that is, move along the axis direction of the packer mechanism pipe body 132. The moving distance is controlled by the gasket 4 and the retaining ring 7 to realize the control of the clamping degree of the conical rubber pad 5; that is, the clamping degree is transmitted according to the pressure magnitude. Its partial enlarged view is as Figure 5 shown.

[0028] The combined seal is formed by the first packer body and the second packer body to block the ejection of gas or high-pressure water in the hole from the gap between the drill tool and the blowout preventer four-way.

[0029] The flange barbs 9 are fixed on the third flange 136 of the four-way main housing 13 by bolts for directly sleeving the negative pressure pipe.

[0030] Compared with the prior art, a pressure conduction type four-way blowout preventer for coal mine underground drilling construction provided by this patent realizes the linkage control of the mechanism on the sealing component through the design of the pressure conduction mechanism. Moreover, the greater the gas pressure ejected from the hole, the better the sealing effect of the sealing component, which can effectively solve the safety hazard problem of gas outburst during the drilling process.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A pressure-conducting four-way blowout preventer device for borehole construction in coal mines, characterized in that: It includes a four-way main housing, which includes a first flange, a packer mechanism pipe body, a large-belly space, a transition pipe and a second flange. A first packer body and a second packer body are respectively arranged in the packer mechanism pipe body; The first packer body includes a gasket arranged on the inner shoulder of the packer mechanism pipe body. A circular rubber gasket and a fourth flange are installed on the gasket along the direction away from the large-belly space of the packer mechanism pipe body. Brushes are respectively arranged at both ends of the circular rubber gasket. The fourth flange is fixed on the first flange of the four-way main housing by bolts; The second packer body includes a conical rubber gasket, a fixing pin, a retaining ring, a spring, a spring seat, a distance sleeve, a conical extrusion sleeve, a locking nut and a bearing plate installed in the right half of the four-way main housing; The retaining ring is fixed on the packer mechanism pipe body by a fixing pin. Its left annular surface serves as the axial position control end of the conical extrusion sleeve, and its right end surface serves as the spring positioning surface. One end of the conical rubber gasket is placed on the inner surface of the conical extrusion sleeve, and the two are in conical surface fit. One end abuts against the gasket. When the conical extrusion sleeve moves axially to the left, the conical rubber gasket radially contracts under the action of the conical surface. One end of the spring seat is installed on the shoulder of the conical extrusion sleeve to control the other end of the spring. Starting from the spring seat, a distance sleeve and a bearing plate are sequentially sleeved along the central axis direction of the packer mechanism pipe body, and finally axially locked by a locking thread, that is, the conical extrusion sleeve, the spring seat, the distance sleeve, the bearing plate and the locking nut are a pressure conduction whole.

2. The pressure conduction type four-way blowout preventer device for underground coal mine drilling construction according to claim 1, characterized in that: Above the four-way main housing is a gas connection outlet, which is connected to the negative pressure pipe in the coal mine and consists of a third flange and a transition pipe; below the four-way main housing is a slag return water outlet, which consists of a hopper-shaped housing and a barbed flange to drain the slag water in the hole to the slag water treatment system.

3. The pressure-conducting four-way blowout preventer device for borehole construction in coal mines according to claim 2, wherein: The flange barb is fixed on the third flange of the four-way main housing by bolts for directly sleeving the negative pressure pipe.

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