Downhole vulcanizer pressurizing and maintaining device and pressurizing, regulating and maintaining method thereof

Abstract

The present invention relates to a pressurizing and pressure-maintaining device for an underground vulcanizer and a pressurizing, pressure-regulating and pressure-maintaining method thereof. The existing underground vulcanizer is inconvenient to regulate and maintain pressure. To this end, the pressurizing and pressure-maintaining device for an underground vulcanizer comprises a pressure bag, a water inlet pipe, a water inlet valve, a water return pipe, a water return valve, a pressure gauge, a second water inlet valve, a front valve, a rear valve and a stepped piston pressure regulating mechanism, wherein the second water inlet valve is arranged on the water inlet pipe between the water inlet valve and the water return pipe, and the stepped piston pressure regulating mechanism comprises a housing and a stepped piston rod, wherein the stepped piston rod comprises a thick cylinder and a thin cylinder, and the ratio of the cross-sectional areas of the two is equal to 4:1.8, and the stepped piston rod is arranged in the housing, and interfaces are respectively provided on the housing side walls at the outer ends of the thick cylindrical cavity and the housing side walls at the outer ends of the thin cylindrical cavity, and the two interfaces are respectively communicated with the water inlet pipes before and after the second water inlet valve, and O-type sealing rings are provided on the thick and thin cylinders. The present invention is convenient for regulating and maintaining pressure, and is suitable for pressurizing and maintaining pressure for underground vulcanizers in coal mines.

Description

Technical Field

[0001] The invention relates to a downhole vulcanizer pressurizing and maintaining device and a pressurizing, pressure regulating and pressure maintaining method thereof. Background Art

[0002] There are many equipments in the mine that need to be pressurized, such as hydraulic props, vulcanizers, hydraulic clamps, etc. The traditional pressurization method is electric pressurization, which uses switches and cables to supply power to the pump station, and uses the pump station to pressurize the equipment that needs to be pressurized. The pressurization process is complicated, and the equipment and electricity investment are large. The cost must include the pump station, switches, cables, electricity, and the labor time for personnel installation. At the same time, the use of electricity has the risk of electric shock to personnel, and the pressure of the pump station is not easy to adjust. When the pressure is too large, there will be a risk of pipeline collapse and injury to personnel.

[0003] The Chinese utility model disclosed on March 22, 2017 with publication number: CN 206030332 U discloses a static pressure device for a vulcanized steel wire rope core tape joint, which is connected to a water inlet pipe on a pressure bag, and the water inlet pipe is connected to an underground dustproof water pipe; starting from the water inlet of the water inlet pipe, the water inlet pipe is provided with a first valve, a first tee, a second tee and a water pressure gauge in sequence; the second valve is connected through the first tee, and the second valve is connected to a return pipe; the third valve is connected through the second tee, and a safety valve is installed on the third valve, and the adjustment pressure of the safety valve is the pressure when the steel wire rope core tape joint is vulcanized.

[0004] The utility model has certain progress, but still has the following problems:

[0005] 1. After the first valve is opened, the pressure bag is connected to the 4 MPa high-pressure water source commonly used underground. You must always pay attention to the water pressure gauge. When the water pressure reaches 1.8 MPa, close the first valve in time. Otherwise, the pressure bag will continue to increase pressure until the safety valve trips.

[0006] 2. During the vulcanization process, you must always pay attention to the indication of the water pressure gauge. When the pressure drops, you need to open the first valve again to pressurize the pressure bag. Otherwise, due to unstable pressure, the rubber inside the pressure bag will not flow smoothly, and air gaps will be generated in some parts of the tape, affecting the quality of the vulcanized tape. Summary of the invention

[0007] The technical problem to be solved by the present invention is how to overcome the defects of the prior art and provide a downhole vulcanizer pressurizing and pressure-maintaining device and a pressurizing, pressure-regulating and pressure-maintaining method thereof which is convenient for pressure regulation and pressure maintenance.

[0008] In order to solve the above technical problems, the downhole vulcanizer pressurization and pressure maintaining device includes a pressure bag, an inlet pipe, an inlet valve, a return pipe, a return valve and a pressure gauge, one end of the inlet pipe is connected to the pressure bag, and the other end is connected to a 4 MPa high-pressure water source commonly used underground, the inlet valve is arranged on the inlet pipe, the return pipe is connected to the inlet pipe downstream of the inlet valve, the return valve is arranged on the return pipe, and the pressure gauge is connected to the inlet pipe downstream of the return pipe. It is characterized in that: it also includes a second inlet valve, a front valve, a rear valve and a stepped piston pressure regulating mechanism, wherein the second inlet valve is arranged on the inlet pipe between the inlet valve and the return pipe, the stepped piston pressure regulating mechanism includes a shell and a stepped piston rod, wherein the stepped piston The rod includes a thick cylinder and a thin cylinder, which are coaxially fixedly connected, and the ratio of their cross-sectional areas is equal to 4:1.8. A thick cylindrical cavity and a thin cylindrical cavity are provided in the shell, and the inner ends of the two are connected, and the center lines coincide. The stepped piston rod is arranged in the shell, and interfaces are respectively provided on the shell side walls at the outer ends of the thick cylindrical cavity and the shell side walls at the outer ends of the thin cylindrical cavity. The interface of the thick cylindrical cavity is connected to the water inlet pipe between the second water inlet valve and the return pipe through the rear valve, the matching pipeline and the tee, and the interface of the thin cylindrical cavity is connected to the water inlet pipe between the second water inlet valve and the water inlet valve through the front valve, the matching pipeline and the tee. Annular grooves are respectively provided on the thick cylinder and the thin cylinder, and O-rings are provided in the annular grooves.

[0009] With this design, the pressure in the pressure bag can be maintained at 1.8 MPa, effectively ensuring the vulcanization quality of the tape.

[0010] As an optimization, a branch pipe is provided on the water inlet pipe downstream of the return pipe, and a valve is provided on the branch pipe. The outer end of the branch pipe is connected to a safety valve, and the tripping pressure of the safety valve is 2.0 MPa. Such a design can prevent the deformation of the pressure bag caused by excessive pressurization.

[0011] The pressurizing, regulating and maintaining method of the pressurizing and maintaining device of the downhole vulcanizer of the present invention comprises the following steps:

[0012] ①. Pressurization: First make sure the front valve, rear valve and return valve are in the closed state, then open the second water inlet valve first, and then slowly open the water inlet valve to fill the pressure bag with water and pressurize it;

[0013] ②. Pressure regulation: After the pressure gauge shows that the internal pressure of the pressure bag reaches 1.9 MPa, close the second water inlet valve, open the front valve and the rear valve, and move the stepped piston rod toward the thin cylindrical cavity to reduce the liquid in the pressure bag, so that the pressure in the pressure bag is reduced and maintained at 1.8 MPa;

[0014] ③. Maintaining pressure: When the pressure in the pressure bag drops, the stepped piston rod moves toward the thick cylindrical cavity to add liquid into the pressure bag, causing the pressure inside the pressure bag to rise and remain at 1.8 MPa.

[0015] The underground vulcanizer pressurizing and maintaining device and the pressurizing, pressure regulating and pressure maintaining method of the invention have simple structure, good pressurizing and pressure maintaining effects, are easy to use, and are suitable for pressurizing and maintaining the underground vulcanizer in coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The downhole vulcanizer pressurizing and maintaining device and the pressurizing, pressure regulating and pressure maintaining method thereof of the present invention are further described below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a structural schematic diagram of the pressure-adding and pressure-maintaining device of the downhole vulcanizer (the stepped piston pressure regulating mechanism is cut along the vertical bisecting plane).

[0018] In the figure: 1 is a pressure bag, 2 is an inlet pipe, 3 is an inlet valve, 4 is a return pipe, 5 is a return valve, 6 is a pressure gauge, 7 is a second inlet valve, 8 is a front valve, 9 is a rear valve, 10 is a shell, 101 is a thick cylindrical cavity, 102 is a thin cylindrical cavity, 11 is a thick cylinder, 12 is a thin cylinder, 13 is an interface, 14 is a matching pipeline, 15 is a tee, 16 is an O-ring, 17 is a branch pipe, 18 is a valve, and 19 is a safety valve. DETAILED DESCRIPTION

[0019] Implementation method 1: Figure 1 As shown, the downhole vulcanizer pressurization and pressure maintaining device includes a pressure bag 1, an inlet pipe 2, an inlet valve 3, a return pipe 4, a return valve 5 and a pressure gauge 6. One end of the inlet pipe 2 is connected to the pressure bag 1, and the other end is connected to a 4 MPa high-pressure water source commonly used underground (not shown in the figure). The inlet valve 3 is arranged on the inlet pipe 2, the return pipe 4 is connected to the inlet pipe 2 downstream of the inlet valve 3, the return valve 5 is arranged on the return pipe 4, and the pressure gauge 6 is connected to the inlet pipe 2 downstream of the return pipe 4. It is characterized in that it also includes a second inlet valve 7, a front valve 8, a rear valve 9 and a stepped piston pressure regulating mechanism, wherein the second inlet valve 7 is arranged on the inlet pipe 2 between the inlet valve 3 and the return pipe 4, and the stepped piston pressure regulating mechanism includes a shell 10 and a stepped piston rod, wherein the stepped piston rod includes a thick cylinder 11 and The thin cylinder 12 is coaxially fixedly connected, and the ratio of their cross-sectional areas is equal to 4:1.8. A thick cylindrical cavity 101 and a thin cylindrical cavity 102 are provided in the shell 10. The inner ends of the two are connected and the center lines coincide. The stepped piston rod is arranged in the shell 10. The shell side walls at the outer ends of the thick cylindrical cavity and the shell side walls at the outer ends of the thin cylindrical cavity are respectively provided with interfaces 13. The interface 13 of the thick cylindrical cavity 101 is communicated with the water inlet pipe 2 between the second water inlet valve 7 and the return pipe 5 through the rear valve 9 and the matching pipeline 14 and the tee 15. The interface 13 of the thin cylindrical cavity 102 is communicated with the water inlet pipe 2 between the second water inlet valve 7 and the water inlet valve 3 through the front valve 8 and the matching pipeline 14 and the tee 15. The thick cylinder 11 and the thin cylinder 12 are respectively provided with annular grooves, and O-rings 16 are provided in the annular grooves.

[0020] A branch pipe 17 is also provided on the water inlet pipe 2 downstream of the return pipe 5. A valve 18 is provided on the branch pipe 17. The outer end of the branch pipe 17 is connected to a safety valve 19. The tripping pressure of the safety valve 19 is 2.0 MPa.

[0021] The pressurizing, regulating and maintaining method of the downhole vulcanizer pressurizing and maintaining device in the first embodiment comprises the following steps:

[0022] ①. Pressurization: First ensure that the front valve 8, the rear valve 9 and the return valve 5 are in the closed state, then open the second water inlet valve 7, and then slowly open the water inlet valve 3 to fill the pressure bag 1 with water and pressurize it.

[0023] ②. Pressure regulation: After the pressure gauge 6 shows that the internal pressure of the pressure bag 1 reaches 1.9 MPa, close the second water inlet valve 7, open the front valve 8 and the rear valve 9, and move the stepped piston rod toward the thin cylindrical cavity 102 ( Figure 1 It is very convenient to reduce the liquid in the pressure bag 1, so that the pressure in the pressure bag 1 is reduced and maintained at 1.8 MPa. In this way, the stable 4 MPa high-pressure water source in the well is fully utilized.

[0024] ③. Maintaining pressure: When the pressure in the pressure bag 1 drops, the stepped piston rod automatically moves toward the thick cylindrical cavity 101 ( Figure 1 Add liquid to the pressure bag 1 to increase the pressure inside the pressure bag 1 and maintain it at 1.8 MPa.

[0025] Note: The pressure unit in this patent is MPa, which is actually pressure. According to industrial practice, it is called pressure.

Claims

1. A downhole vulcanizer pressurizing and maintaining device, comprising a pressure bag, a water inlet pipe, a water inlet valve, a water return pipe, a water return valve and a pressure gauge, wherein one end of the water inlet pipe is connected to the pressure bag, and the other end is connected to a 4 MPa high-pressure water source commonly used downhole, the water inlet valve is arranged on the water inlet pipe, the water return pipe is connected to the water inlet pipe downstream of the water inlet valve, the water return valve is arranged on the water return pipe, and the pressure gauge is connected to the water inlet pipe downstream of the water return pipe, characterized in that: It also includes a second water inlet valve, a front valve, a rear valve and a stepped piston pressure regulating mechanism, wherein the second water inlet valve is arranged on the water inlet pipe between the water inlet valve and the return pipe, the stepped piston pressure regulating mechanism includes a shell and a stepped piston rod, wherein the stepped piston rod includes a thick cylinder and a thin cylinder, the two are coaxially fixed, and the ratio of the cross-sectional areas of the two is equal to 4:1.8, a thick cylindrical cavity and a thin cylindrical cavity are arranged in the shell, the inner ends of the two are connected, and the center lines coincide, the stepped piston The plug rod is arranged in the shell body, and interfaces are respectively opened on the shell side walls at the outer ends of the thick cylindrical cavity and the shell side walls at the outer ends of the thin cylindrical cavity. The interface of the thick cylindrical cavity is communicated with the water inlet pipe between the second water inlet valve and the return pipe through the rear valve and the matching pipeline and the tee, and the interface of the thin cylindrical cavity is communicated with the water inlet pipe between the second water inlet valve and the water inlet valve through the front valve and the matching pipeline and the tee. Annular grooves are respectively opened on the thick cylinder and the thin cylinder, and O-rings are arranged in the annular grooves.

2. The downhole vulcanizer pressurizing and maintaining device according to claim 1, characterized in that: A branch pipe is also provided on the water inlet pipe downstream of the return pipe. A valve is provided on the branch pipe. The outer end of the branch pipe is connected to a safety valve, and the tripping pressure of the safety valve is 2.0 MPa.

3. A method for pressurizing, regulating and maintaining pressure of the downhole vulcanizer pressurizing and maintaining pressure device according to claim 1 or 2, comprising the following steps: ①. Pressurization: First make sure the front valve, rear valve and return valve are in the closed state, then open the second water inlet valve first, and then slowly open the water inlet valve to fill the pressure bag with water and pressurize it; ②. Pressure regulation: After the pressure gauge shows that the internal pressure of the pressure bag reaches 1.9 MPa, close the second water inlet valve, open the front valve and the rear valve, and move the stepped piston rod toward the thin cylindrical cavity to reduce the liquid in the pressure bag, so that the pressure in the pressure bag is reduced and maintained at 1.8 MPa; ③. Maintaining pressure: When the pressure in the pressure bag drops, the stepped piston rod moves toward the thick cylindrical cavity to add liquid into the pressure bag, causing the pressure inside the pressure bag to rise and remain at 1.8 MPa.

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