Plug valve suitable for high-pressure gas conveying

Abstract

The utility model discloses a plug valve suitable for high-pressure gas conveying. The plug valve comprises a valve body and a high-pressure protection mechanism. Connecting flanges are arranged at the left end and the right end of the valve body, a cock groove is formed in the middle of the valve body, a cock lining is arranged on the inner wall of the cock groove, a cock column is rotationally connected into the cock lining, a circulation hole is formed in the outer arc face of the cock column, a rotating column is arranged in the middle of the upper surface of the cock column, and the upper end of the valve body is connected with a valve deck through a bolt. The high-pressure protection mechanism is arranged at the left end of the valve body. According to the plug valve, the sealing effect between the plug column and the lining is improved through the pressure of conveyed gas, leakage-proof protection is provided for the plug valve, when the gas pressure exceeds the specified range, air pressure in the plug valve is automatically released, explosion-proof protection is provided for the plug valve, the plug valve is safer to use, and the safety of the plug valve is improved. And the plug valve is more suitable for conveying high-pressure gas.

Description

Technical Field

[0001] The utility model relates to the technical field of plug valves, in particular to a plug valve suitable for high-pressure gas delivery. Background Art

[0002] A plug valve is a rotary valve with a plunger-shaped closing piece. It is a valve that is opened or closed by rotating 90 degrees to connect or separate the channel port on the valve plug with the channel port on the valve body. There are many types of plug valves. According to the structural form, they can be divided into four types: tight-fitting plug valves, self-sealing plug valves, plug valves and oil-filled plug valves. According to the channel form, they can be divided into three types: straight-through plug valves, three-way plug valves and four-way plug valves. They have the advantages of simple structure, fast switching and small fluid resistance. They are widely used in petrochemical, chemical, coal gas, natural gas, liquefied petroleum gas, HVAC industry and general industry.

[0003] In the prior art, in order to prevent the medium from leaking from the gap between the plug column and the valve body, a plug liner is often provided on the inner wall of the valve body to seal the plug column and the valve body to prevent the leakage of the medium. However, the plug column and the plug liner are rotatably connected. When the air pressure transported in the plug valve is too high, the high-pressure gas is likely to leak from between the plug column and the plug liner. Moreover, when some plug valves are transporting high-pressure gas, the air pressure is likely to be too high inside the plug valve, which has low safety and is not suitable for transporting high-pressure gas. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a plug valve suitable for high-pressure gas delivery, provide leakage and explosion-proof protection for the plug valve, make the use of the plug valve safer, and be more suitable for high-pressure gas delivery work, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a plug valve suitable for high-pressure gas delivery, comprising a valve body and a high-pressure protection mechanism;

[0006] Valve body: Both left and right ends of the valve body are provided with connecting flanges, a plug groove is provided in the middle of the valve body, a plug bushing is provided on the inner wall of the plug groove, a plug column is rotatably connected inside the plug bushing, a flow hole is provided on the outer arc surface of the plug column, a rotating column is provided in the middle of the upper surface of the plug column, and a valve cover is connected to the upper end of the valve body by bolts;

[0007] High-pressure protection mechanism: It is set at the left end of the valve body. It uses the pressure of the conveying gas to increase the sealing effect between the plug column and the lining, providing leakage protection for the plug valve. When the gas pressure exceeds the specified range, it automatically releases the gas pressure inside the plug valve, providing explosion-proof protection for the plug valve. The use of the plug valve is safer and the plug valve is more suitable for the delivery of high-pressure gas.

[0008] Furthermore, the high-pressure protection mechanism includes an annular guide hole and an annular leak-proof groove, the annular guide hole is arranged at the left end of the plug sleeve, the annular leak-proof groove is arranged at the left end of the plug groove, the annular guide hole and the annular leak-proof groove are connected, the central axis of the valve body, the central axis of the annular guide hole and the central axis of the annular leak-proof groove are collinear, and the pressure of the conveying gas is used to increase the sealing effect between the plug column and the liner.

[0009] Furthermore, the high-pressure protection mechanism also includes an explosion-proof cylinder and a pressure relief pipe. The explosion-proof cylinder is arranged at the left end of the valve body, the explosion-proof cylinder is connected to the annular leak-proof groove, and a pressure relief pipe is provided at the exhaust port of the outer arc surface of the explosion-proof cylinder to provide space for pressure relief.

[0010] Furthermore, the high-pressure protection mechanism also includes a sliding column, a sealing pad and a spring. The sliding column is slidably connected to the inside of the pressure relief pipe. The outer arc surface of the disk at the rear end of the sliding column is provided with a sealing pad. The sealing pad fits with the inner arc surface of the pressure relief pipe. The movable sleeve on the outer arc surface of the sliding column is provided with a spring. The front end of the spring is fixedly connected to the pressure relief pipe, and the rear end of the spring is fixedly connected to the disk at the rear end of the sliding column to automatically relieve pressure.

[0011] Furthermore, the outer side wall of the annular guide hole is a conical arc surface, which facilitates the high-pressure gas to exert force on the plug bushing.

[0012] Furthermore, the inner arc surface of the pressure relief pipe is a conical arc surface, which improves the sealing effect between the pressure relief pipe and the sliding column.

[0013] Furthermore, the upper end of the rotating column passes through the interior of the valve cover and is provided with a rectangular column to facilitate the rotation of the rotating column.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. When in use, turn the plug column. When the flow hole coincides with the channel opening of the valve body, the high-pressure gas flows inside the valve body. When the flow hole and the channel opening of the valve body are misaligned, the flow of high-pressure gas inside the valve body is blocked by the cooperation of the plug column and the plug bushing. During use, when the pressure of the delivered gas is too high, the high-pressure gas will enter the annular guide hole and the annular leak-proof groove through the gap between the plug bushing and the plug column. When the annular leak-proof groove is completely filled with high-pressure gas, under the action of air pressure, a force is applied to the outer arc surface of the plug bushing, so that the contact between the plug bushing and the plug column is closer, and the pressure of the delivered gas is used to increase the sealing effect between the plug column and the lining, thereby providing leak-proof protection for the plug valve and making the plug valve more suitable for the delivery of high-pressure gas.

[0016] 2. When the pressure of the conveyed gas exceeds the safe value, the air pressure will overcome the elastic force of the spring and push the sliding column forward. When the sealing rubber pad is located in front of the pressure relief pipe, the high-pressure gas will be discharged into the external collection equipment through the pressure relief pipe to prevent the plug valve from exploding due to excessive air pressure inside. When the gas pressure exceeds the specified range, the air pressure inside the plug valve is automatically released to provide explosion-proof protection for the plug valve. The use of the plug valve is safer and the plug valve is more suitable for the transportation of high-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the front view cross section of the overall device of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the overall device of the utility model in a top view;

[0020] Figure 4 It is a schematic diagram of the enlarged structure of point A of the utility model.

[0021] In the figure: 1 valve body, 2 connecting flange, 3 plug groove, 4 plug bushing, 5 plug column, 6 flow hole, 7 rotating column, 8 valve cover, 9 high pressure protection mechanism, 91 annular guide hole, 92 annular leak-proof groove, 93 explosion-proof cylinder, 94 pressure relief pipe, 95 sliding column, 96 sealing rubber pad, 97 spring, 10 rectangular column. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] See also Figure 1-4 , This embodiment provides a technical solution: a plug valve suitable for high-pressure gas delivery, comprising a valve body 1 and a high-pressure protection mechanism 9;

[0024] Valve body 1: Both left and right ends thereof are provided with connecting flanges 2, which are convenient for connecting the plug valve with an external pipeline. A plug groove 3 is provided in the middle of the valve body 1, and a plug bushing 4 is provided on the inner wall of the plug groove 3. A plug column 5 is rotatably connected inside the plug bushing 4. A flow hole 6 is provided on the outer arc surface of the plug column 5. A rotating column 7 is provided in the middle of the upper surface of the plug column 5. The plug column 5 is rotated by the rotating column 7. When the flow hole 6 coincides with the passage opening of the valve body 1, high-pressure gas flows inside the valve body 1. When the flow hole 6 is misaligned with the passage opening of the valve body 1, the flow of high-pressure gas inside the valve body 1 is blocked by the cooperation of the plug column 5 and the plug bushing 4. A valve cover 8 is connected to the upper end of the valve body 1 by bolts to close the opening at the upper end of the valve body 1. A sealing ring is provided inside the valve cover 8 to seal between the rotating column 7 and the valve cover 8. The upper end of the rotating column 7 passes through the interior of the valve cover 8 and is provided with a rectangular column 10, which is convenient for rotating the rotating column 7.

[0025] High-pressure protection mechanism 9: arranged at the left end of the valve body 1, the high-pressure protection mechanism 9 includes an annular guide hole 91 and an annular anti-leakage groove 92, the annular guide hole 91 is arranged at the left end of the plug bushing 4, the annular anti-leakage groove 92 is arranged at the left end of the plug groove 3, the annular guide hole 91 and the annular anti-leakage groove 92 are connected, the central axis of the valve body 1, the central axis of the annular guide hole 91 and the central axis of the annular anti-leakage groove 92 are collinear, when the pressure of the delivered gas is too large, the high-pressure gas will enter the annular guide hole 91 and the annular anti-leakage groove through the gap between the plug bushing 4 and the plug column 5 92, when the annular leakproof groove 92 is completely filled with high-pressure gas, under the action of air pressure, a force is applied to the outer arc surface of the plug bushing 4, so that the contact between the plug bushing 4 and the plug column 5 is closer, the sealing effect is improved, and leakage protection is provided for the plug valve. The greater the air pressure, the higher the sealing effect. The high-pressure protection mechanism 9 also includes an explosion-proof cylinder 93 and a pressure relief pipe 94. The explosion-proof cylinder 93 is arranged at the left end of the valve body 1, and the explosion-proof cylinder 93 is connected to the annular leakproof groove 92. The exhaust port of the outer arc surface of the explosion-proof cylinder 93 is provided with a pressure relief pipe 94. The protective mechanism 9 also includes a slide post 95, a sealing pad 96 and a spring 97. The slide post 95 is slidably connected to the inside of the pressure relief pipe 94. The outer arc surface of the disc at the rear end of the slide post 95 is provided with a sealing pad 96. The sealing pad 96 fits with the inner arc surface of the pressure relief pipe 94. The outer arc surface movable sleeve of the slide post 95 is provided with a spring 97. The front end of the spring 97 is fixedly connected to the pressure relief pipe 94, and the rear end of the spring 97 is fixedly connected to the disc at the rear end of the slide post 95. When the gas pressure of the conveyed gas exceeds the safe value, the elastic force of the spring 97 will be overcome under the action of the gas pressure, pushing the slide post 95 forward. When the sealing rubber pad 96 is located in front of the pressure relief pipe 94, the high-pressure gas will be discharged to the outside collecting device through the pressure relief pipe 94 to prevent the internal gas pressure of the plug valve from being too high and causing explosion. The outer wall of the annular guide hole 91 is a conical arc surface, which is convenient for the high-pressure gas to apply force to the plug bushing 4. The inner arc surface of the pressure relief pipe 94 is a conical arc surface. The diameter of the inner arc surface of the pressure relief pipe 94 gradually decreases from back to front. As the sealing rubber pad 96 moves forward, the deformation amplitude of the sealing rubber pad 96 gradually increases, and the sealing effect between the sealing rubber pad 96 and the pressure relief pipe 94 is better.

[0026] The working principle of the utility model is as follows:

[0027] When in use, the plug post 5 is rotated by the rotating column 7. When the flow hole 6 coincides with the passage opening of the valve body 1, the high-pressure gas flows inside the valve body 1. When the flow hole 6 is misaligned with the passage opening of the valve body 1, the flow of the high-pressure gas inside the valve body 1 is blocked by the cooperation of the plug post 5 and the plug bushing 4.

[0028] During use, when the pressure of the delivered gas is too high, the high-pressure gas will enter the annular guide hole 91 and the annular anti-leakage groove 92 through the gap between the plug bushing 4 and the plug column 5. When the annular anti-leakage groove 92 is completely filled with high-pressure gas, under the action of the air pressure, a force is applied to the outer arc surface of the plug bushing 4, so that the contact between the plug bushing 4 and the plug column 5 is closer, thereby improving the sealing effect and providing anti-leakage protection for the plug valve. The greater the air pressure, the higher the sealing effect.

[0029] When the pressure of the conveying gas exceeds the safe value, the air pressure will overcome the elastic force of the spring 97 and push the sliding column 95 forward. When the sealing gasket 96 is located in front of the pressure relief pipe 94, the high-pressure gas will be discharged into the external collection device through the pressure relief pipe 94 to prevent the plug valve from exploding due to excessive air pressure inside.

[0030] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A plug valve suitable for high-pressure gas delivery, characterized in that: It comprises a valve body (1) and a high-pressure protection mechanism (9); The left and right ends of the valve body (1) are both provided with connecting flanges (2), the middle of the valve body (1) is provided with a plug groove (3), the inner wall of the plug groove (3) is provided with a plug bushing (4), the inside of the plug bushing (4) is rotatably connected with a plug column (5), the outer arc surface of the plug column (5) is provided with a flow hole (6), the middle of the upper surface of the plug column (5) is provided with a rotating column (7), and the upper end of the valve body (1) is connected to a valve cover (8) by bolts; The high-pressure protection mechanism (9) is arranged at the left end of the valve body (1); The high-pressure protection mechanism (9) comprises an annular flow guide hole (91) and an annular leakage-proof groove (92); the annular flow guide hole (91) is arranged at the left end of the plug bushing (4); the annular leakage-proof groove (92) is arranged at the left end of the plug groove (3); the annular flow guide hole (91) and the annular leakage-proof groove (92) are connected; and the central axis of the valve body (1), the central axis of the annular flow guide hole (91) and the central axis of the annular leakage-proof groove (92) are collinear.

2. A plug valve suitable for high-pressure gas delivery according to claim 1, characterized in that: The high-pressure protection mechanism (9) further comprises an explosion-proof cylinder (93) and a pressure relief pipe (94); the explosion-proof cylinder (93) is arranged at the left end of the valve body (1); the explosion-proof cylinder (93) is connected to the annular anti-leakage groove (92); and the pressure relief pipe (94) is arranged at the exhaust port of the outer arc surface of the explosion-proof cylinder (93).

3. A plug valve suitable for high-pressure gas delivery according to claim 2, characterized in that: The high-pressure protection mechanism (9) also includes a sliding column (95), a sealing rubber pad (96) and a spring (97). The sliding column (95) is slidably connected to the inside of the pressure relief pipe (94). The outer arc surface of the disc at the rear end of the sliding column (95) is provided with a sealing rubber pad (96). The sealing rubber pad (96) fits with the inner arc surface of the pressure relief pipe (94). The outer arc surface movable sleeve of the sliding column (95) is provided with a spring (97). The front end of the spring (97) is fixedly connected to the pressure relief pipe (94), and the rear end of the spring (97) is fixedly connected to the disc at the rear end of the sliding column (95).

4. A plug valve suitable for high-pressure gas delivery according to claim 1, characterized in that: The outer side wall of the annular guide hole (91) is a conical arc surface.

5. A plug valve suitable for high-pressure gas delivery according to claim 2, characterized in that: The inner arc surface of the pressure relief pipe (94) is a conical arc surface.

6. A plug valve suitable for high-pressure gas delivery according to claim 1, characterized in that: The upper end of the rotating column (7) passes through the interior of the valve cover (8) and is provided with a rectangular column (10).

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