Pressure release valve of inflatable high-pressure switch

Abstract

The utility model relates to the technical field of pressure release valves, in particular to a pressure release valve of an inflatable high-pressure switch. Comprising a sealing plate and a fixing flange, a sealing groove is formed in the inner side surface of the sealing plate, a circular pressure relief hole is formed in the middle of the sealing plate, threaded holes are evenly formed in the outer side of the sealing plate, a rectangular sealing ring is arranged on the inner side of the sealing plate and located in the sealing groove, an anti-explosion piece is arranged at the pressure relief hole of the sealing plate, and a limiting ring is arranged on the outer side of the anti-explosion piece. An O-shaped sealing ring is arranged on the inner side of the limiting ring, a fixing flange is arranged on the limiting ring, the fixing flange is connected to the sealing plate through a bolt, and the anti-explosion piece, the limiting ring and the O-shaped sealing ring are limited on the inner side of the fixing flange and connected to the sealing plate at the same time. The device is mainly applied to inflatable switch cabinets and ring main units, can effectively eradicate explosion risks caused by internal faults of the switch cabinets, and is simple and convenient to arrange and reliable to use. The cover plate can be used for pressure relief and can also be used as a maintenance channel cover plate of an air chamber.

Description

Technical Field

[0001] The utility model relates to a pressure relief valve, in particular to a pressure relief valve for an inflatable high-voltage switch. Background Art

[0002] In a gas-insulated metal-enclosed switchgear, it is particularly crucial to achieve timely and effective pressure relief. If a large amount of energy cannot be released normally due to an internal fault in the enclosed box, there is a high risk of fire and explosion. During design, if the strength of the explosion-proof film is low, air leakage will occur, resulting in a decline in insulation performance; if the strength of the explosion-proof film is high, it will not be able to break through when the pressure value is reached, thus leading to the risk of air chamber deformation and explosion. For a double-air chamber structure, each air chamber also requires a pressure relief device. Summary of the Utility Model

[0003] The utility model aims to solve the above defects and provides a pressure relief valve for an inflatable high-voltage switch.

[0004] To overcome the defects in the background art, the technical solution adopted by the utility model to solve its technical problems is: this pressure relief valve for an inflatable high-voltage switch includes a sealing plate and a fixed flange. The inner surface of the sealing plate is provided with a sealing groove, and there is a circular pressure relief hole in the middle. The outer side of the sealing plate is provided with evenly arranged threaded holes. A rectangular sealing ring is arranged inside the sealing plate, and the rectangular sealing ring is located in the sealing groove. An explosion-proof film is arranged at the pressure relief hole of the sealing plate. A limiting ring is arranged outside the explosion-proof film, and an O-ring is arranged inside the limiting ring. The limiting ring is provided with a fixed flange, and the fixed flange is connected to the sealing plate through bolts, and the explosion-proof film, the limiting ring, and the O-ring are limited inside the fixed flange and simultaneously connected to the sealing plate.

[0005] According to another embodiment of the utility model, it further includes that the outer shape of the sealing plate is rectangular and is made of high-strength aluminum alloy material with a thickness of 15 mm.

[0006] According to another embodiment of the utility model, it further includes that the threaded holes on the sealing plate are blind holes.

[0007] According to another embodiment of the utility model, it further includes that the cross-section of the rectangular sealing ring is circular.

[0008] According to another embodiment of the utility model, it further includes that the cross-section of the limiting ring is square.

[0009] According to another embodiment of the utility model, it further includes that the cross-section of the fixed flange is L-shaped and is integrally annular. There is a step inside the fixed flange, and a super-sealing plate for pressing the O-ring is arranged at the step, and at the same time, the outside of the O-ring is limited. The end face of the fixed flange is provided with evenly arranged through bolt holes.

[0010] According to another embodiment of the present utility model, it further includes that the explosion-proof sheet is provided with a concave spherical surface, and its material is a 0.5-mm stainless steel plate. The convex surface of the explosion-proof sheet faces the inside of the gas chamber.

[0011] The beneficial effects of the present utility model are as follows: It is mainly applied to gas-insulated switchgear and ring main units, and can effectively eliminate the explosion risk caused by internal faults in the switchgear. The device is simple in arrangement and reliable in use. It can not only be used for pressure relief, but also can be used as the maintenance channel cover plate of the gas chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0013] Figure 1 is a schematic structural diagram of the explosion diagram of the present utility model;

[0014] Figure 2 is a schematic structural diagram of the present utility model;

[0015] Figure 3 is Figure 2 the schematic structural diagram in the A-A direction in

[0016] Among them: 1. Sealing plate, 2. Rectangular sealing ring, 3. Explosion-proof sheet, 4. Limiting ring, 5. Fixed flange, 6. O-ring, 7. Bolt, 8. Sealing groove, 9. Pressure relief hole DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are some, rather than all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0018] As Figures 1-3 shown, the pressure relief valve is a pressure relief device applied to gas-insulated switchgear, and the pressure relief device is applied to a circular pressure relief channel. It mainly consists of a sealing plate 1, a rectangular sealing ring 2, an explosion-proof sheet 3, a fixed flange 5, etc.

[0019] As Figures 1-3As shown in the figure, the figure includes a sealing plate 1 and a fixed flange 5. The inner surface of the sealing plate 1 is provided with a sealing groove 8, and a circular pressure relief hole 9 is provided in the middle. The outer side of the sealing plate 1 is provided with uniformly arranged threaded holes. A rectangular sealing ring 2 is provided on the inner side of the sealing plate 1. The rectangular sealing ring 2 is located in the sealing groove 8. An explosion-proof sheet 3 is provided at the pressure relief hole 9 of the sealing plate 1. A limiting ring 4 is provided on the outer side of the explosion-proof sheet 3. An O-ring 6 is provided on the inner side of the limiting ring 4. A fixed flange 5 is provided on the limiting ring 4. The fixed flange 5 is connected to the sealing plate 1 through bolts 7, and the explosion-proof sheet 3, the limiting ring 4 and the O-ring 6 are limited inside the fixed flange 5 and are simultaneously connected to the sealing plate 1.

[0020] The outer shape of the sealing plate 1 is rectangular and is made of 15 mm thick high-strength aluminum alloy. The inner surface of the sealing plate 1 is provided with a sealing groove 8, and a circular pressure relief hole 9 is provided in the middle. Blind threaded holes are provided uniformly on the back of the sealing plate 1. A rectangular sealing ring 2 is installed in the sealing groove 8 on the inner side of the sealing plate 1. Its cross-section is circular, and its outer shape is rectangular like the sealing groove, mainly used for the sealing between the sealing plate 1 and the air chamber equipment. The explosion-proof sheet 3 is a key component of the pressure relief device, with an inwardly concave spherical surface, and the material is 0.5 mm stainless steel plate. When installed, the convex surface faces the inside of the air chamber. A limiting ring 4 is provided on the outer side of the explosion-proof sheet 3. The cross-section of the limiting ring 4 is square, used for limiting the inner side of the O-ring 6 to prevent the sealing ring from deforming. The cross-section of the fixed flange 5 is L-shaped and is integrally annular. When installed, the step part faces the sealing plate, used to press the sealing ring, and at the same time limit the outer side of the O-ring 6. Through holes for bolts are provided uniformly on the end face of the fixed flange 5. The O-ring 6 is sandwiched between the limiting ring 4 and the fixed flange 5 as seen from the sectional view, used for the sealing between the sealing plate and the explosion-proof sheet. The bolts 7 are used for the installation of the fixed flange 5, and there are 8 bolts evenly distributed. The parts are installed from the outside to the inside in turn as bolts, fixed flange, explosion-proof sheet, O-ring, limiting ring, sealing plate, rectangular sealing ring.

[0021] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A pressure relief valve for an inflatable high-pressure switch, comprising a sealing plate (1) and a fixing flange (5), characterized in that: The inner surface of the sealing plate (1) is provided with a sealing groove (8) and a circular pressure relief hole (9) in the middle. The outer side of the sealing plate (1) is provided with evenly arranged threaded holes. The inner side of the sealing plate (1) is provided with a rectangular sealing ring (2), and the rectangular sealing ring (2) is located in the sealing groove (8). The pressure relief hole (9) of the sealing plate (1) is provided with an explosion-proof disk (3). The outer side of the explosion-proof disk (3) is provided with a limiting ring (4), and the inner side of the limiting ring (4) is provided with an O-type sealing ring (6). A fixing flange (5) is provided on the limiting ring (4), and the fixing flange (5) is connected to the sealing plate (1) by bolts (7), so that the explosion-proof disk (3), the limiting ring (4) and the O-type sealing ring (6) are limited on the inner side of the fixing flange (5) and connected to the sealing plate (1) at the same time.

2. A pressure relief valve for an inflatable high-pressure switch according to claim 1, characterized in that: The sealing plate (1) is rectangular in shape and is made of a high-strength aluminum alloy material with a thickness of 15 mm.

3. The pressure relief valve of an inflatable high-pressure switch according to claim 1, characterized in that: The threaded hole on the sealing plate (1) is a blind hole.

4. The pressure relief valve of an inflatable high-pressure switch according to claim 1, characterized in that: The cross section of the rectangular sealing ring (2) is circular.

5. The pressure relief valve of an inflatable high-pressure switch according to claim 1, characterized in that: The cross section of the limiting ring (4) is square.

6. The pressure relief valve of an inflatable high-pressure switch according to claim 1, characterized in that: The fixing flange (5) has an L-shaped cross section and is annular as a whole. A step is provided inside the fixing flange (5). An over-sealing plate for pressing the O-ring (6) is provided at the step and limiting the outer side of the O-ring (6). The end surface of the fixing flange (5) is provided with bolt holes that are evenly arranged and penetrate through the fixing flange (5).

7. The pressure relief valve of an inflatable high-pressure switch according to claim 1, characterized in that: The explosion-proof disc (3) is provided with an inwardly concave spherical surface, and is made of a 0.5 mm stainless steel plate; the convex surface of the explosion-proof disc (3) faces the interior of the air chamber.

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