Axial static sealing ring structure for GIS (Gas Insulated Switchgear)

Abstract

The axial static sealing ring structure for the GIS comprises a sealing ring body, and the hole wall of an inner hole of the sealing ring body is provided with an air pressure side upper one-way valve type sealing lip extending upwards in an inclined mode towards the gas side of the GIS and an air pressure side lower one-way valve type sealing lip extending downwards in an inclined mode. The plane where the upper edge of the air pressure side upper one-way valve type sealing lip is located is higher than or flush with the plane where the upper edge of the sealing ring body is located. The plane where the lower edge of the air pressure side lower one-way valve type sealing lip is located is lower than the plane where the lower edge of the sealing ring body is located. First sealing is formed by arranging the air pressure side upper one-way valve type sealing lip and the air pressure side lower one-way valve type sealing lip, second sealing is formed by arranging the sealing ring body to be an O-shaped ring, and third sealing is formed by arranging the outer side upper end face static sealing lip and the outer side lower end face static sealing lip. And the advantage of good rebound resilience of the O-shaped ring is reserved, and three seals are formed, so that the sealing effect is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switch technology, and in particular to the field of sealing of high-voltage switchgear, specifically referring to an axial static sealing ring structure for GIS. Background Technology

[0002] A sealing ring is a component used to seal the gap between two connected parts. Depending on the dynamic and static conditions of the installation location, they are mainly divided into dynamic sealing rings and static sealing rings. For static sealing rings, O-rings are usually used because they have a simple structure, are easy to process, and have relatively mature technology.

[0003] GIS is a type of switchgear that combines circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers, and surge arresters, and is enclosed in a metal casing and gas-insulated. It is widely used due to its strong environmental adaptability.

[0004] The static sealing rings used in existing GIS systems, especially those at the main sealing positions, are mainly conventional O-rings. While this structure is technologically mature, simple in design, and easy to manufacture, the increasing emphasis on carbon emissions and the urgent need to control greenhouse gas emissions, coupled with the growing trend towards environmentally friendly GIS equipment, have led to increased internal gas pressure and greater control challenges. To improve gas leakage control and meet the requirements of new standards from State Grid and China Southern Power Grid, a new axial sealing structure is needed to better achieve GIS sealing. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing an axial static sealing ring structure for GIS, achieving triple sealing and thus greatly improving the sealing effect.

[0006] This utility model is achieved through the following technical solution: it provides an axial static sealing ring structure for GIS, including a sealing ring body that is closed in the circumferential direction. The inner wall of the sealing ring body is provided with an upper one-way valve type sealing lip on the pressure side that extends upward towards the GIS gas side and a lower one-way valve type sealing lip on the pressure side that extends downward. Both the upper one-way valve type sealing lip and the lower one-way valve type sealing lip on the pressure side are closed in the circumferential direction.

[0007] Along the thickness direction of the sealing ring body, the plane containing the upper edge of the one-way valve sealing lip on the pneumatic side is higher than or flush with the plane containing the upper edge of the sealing ring body; the plane containing the lower edge of the one-way valve sealing lip on the pneumatic side is lower than or flush with the plane containing the lower edge of the sealing ring body.

[0008] In use, the sealing ring structure is installed within the sealing groove formed by the sealing cover flange and the sealing groove flange. The upper edge of the upper one-way valve sealing lip on the pressure side is in sealing contact with the sealing cover flange, and the lower edge of the lower one-way valve sealing lip on the pressure side is in sealing contact with the bottom of the sealing groove, achieving the first seal. By setting the upper and lower one-way valve sealing lips on the pressure side to extend downwards, the upper and lower one-way valve sealing lips on the pressure side are deformed under pressure, thereby... The upper and lower edges of the sealing ring body are made to make sealing contact with the sealing cover flange and the bottom of the sealing groove, respectively, thus forming a second seal and improving the sealing effect. Furthermore, the inclined setting of the upper one-way valve type sealing lip and the lower one-way valve type sealing lip on the pressure side ensures that when the gas inside the GIS impacts the sealing ring structure, the upper one-way valve type sealing lip and the lower one-way valve type sealing lip on the pressure side are pressed even tighter against the sealing cover flange and the bottom of the sealing groove, further ensuring the reliability of the seal and preventing GIS gas leakage.

[0009] As an optimization, the outer circumference of the sealing ring body is provided with an upper outer static sealing lip extending upward along the thickness direction and a lower outer static sealing lip extending downward. Both the upper and lower outer static sealing lips are circumferentially closed. Along the thickness direction of the sealing ring body, the plane containing the upper edge of the upper outer static sealing lip is higher than or flush with the plane containing the upper edge of the sealing ring body, and the plane containing the lower edge of the lower outer static sealing lip is lower than or flush with the plane containing the lower edge of the sealing ring body. This optimized solution, by setting the upper and lower outer static sealing lips, ensures that after the sealing cover flange is placed on the sealing groove, the upper outer static sealing lip is in sealing contact with the sealing cover flange, and the lower outer static sealing lip is in sealing contact with the bottom of the sealing groove, thus achieving a third seal and further improving the sealing effect.

[0010] As an optimization, the main body of the sealing ring is an O-ring, and the upper one-way valve sealing lip on the pressure side, the lower one-way valve sealing lip on the pressure side, and the O-ring are integrally molded. This optimized solution uses an O-ring as the main body of the sealing ring, retaining the good resilience of the O-ring, and the three parts are integrally molded to ensure the integrity of the sealing ring structure.

[0011] As an optimization, a downwardly recessed first arc-shaped groove is provided between the upper one-way valve-type sealing lip on the pressure side and the upper arc-shaped apex of the O-ring, and an upwardly recessed second arc-shaped groove is provided between the lower one-way valve-type sealing lip on the pressure side and the lower arc-shaped apex of the O-ring. This optimized design, by providing the first and second arc-shaped grooves, facilitates tighter contact between the upper one-way valve-type sealing lip and the upper arc-shaped apex of the O-ring and the sealing cover flange, respectively, and also facilitates tighter contact between the lower one-way valve-type sealing lip and the lower arc-shaped apex of the O-ring and the bottom of the sealing groove, thereby further improving the sealing effect.

[0012] As an optimization, a third concave arc-shaped groove is provided between the upper outer end face static sealing lip and the upper arc apex of the O-ring, and a fourth concave arc-shaped groove is provided between the lower outer end face static sealing lip and the lower arc apex of the O-ring. This optimized design, by providing the third and fourth arc-shaped grooves, facilitates tighter contact between the upper outer end face static sealing lip and the upper arc apex of the O-ring with the sealing cover flange, and also facilitates tighter contact between the lower outer end face static sealing lip and the lower arc apex of the O-ring with the bottom of the sealing groove.

[0013] As an optimization, the angle between the upper one-way valve sealing lip on the pressure side and the plane where the sealing ring body is located is 45°~60°, and the angle between the lower one-way valve sealing lip on the pressure side and the plane where the sealing ring body is located is 45°~60°. This optimized design not only ensures better sealing performance of the upper and lower one-way valve sealing lips on the pressure side under the internal gas pressure of the GIS, but also avoids the problem of the upper and lower one-way valve sealing lips on the pressure side being difficult to compress along the thickness direction due to excessively large angles between them, thus ensuring the sealing performance of the sealing ring body.

[0014] The beneficial effects of this utility model are as follows: by setting an upper one-way valve-type sealing lip on the air pressure side and a lower one-way valve-type sealing lip on the air pressure side, a first seal is formed; by setting the sealing ring body as an O-ring, a second seal is formed; and by setting an upper outer end face static sealing lip and a lower outer end face static sealing lip, a third seal is formed. This not only retains the advantage of good resilience of the O-ring, but also forms three seals, greatly improving the sealing effect. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0016] Figure 2 for Figure 1 Enlarged view of a portion of the image;

[0017] Figure 3This is a schematic diagram of the usage state of this utility model;

[0018] Figure 4 This is a schematic diagram of the three-layer seal of this utility model;

[0019] As shown in the figure:

[0020] 1. Upper one-way valve sealing lip on the air pressure side; 2. Lower one-way valve sealing lip on the air pressure side; 3. Sealing ring body; 4. Upper outer static sealing lip; 5. Lower outer static sealing lip; 6. First seal; 7. Second seal; 8. Third seal; 9. Sealing cover flange; 10. Sealing groove flange. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0022] The sealing structure in this embodiment is the main sealing structure at the GIS insulator and housing flange. It is used for the axial static sealing of the GIS in high-voltage switch. The sealing ring material is consistent with the original O-ring, which is rubber. It can adapt to different pressure environments such as SF6, C4F7N mixed gas, and air.

[0023] Specifically, such as Figure 1 and 2 The diagram shows an axial static sealing ring structure for GIS, comprising a sealing ring body 3 that is closed circumferentially. The inner wall of the sealing ring body 3 is provided with an upper one-way valve type sealing lip 1 on the pressure side that extends upward toward the GIS gas side and is inclined upward, and a lower one-way valve type sealing lip 2 on the pressure side that extends downward toward the GIS gas side. Both the upper one-way valve type sealing lip 1 and the lower one-way valve type sealing lip 2 on the pressure side are closed circumferentially.

[0024] The upper one-way valve sealing lip on the air pressure side and the lower one-way valve sealing lip on the air pressure side are distributed along the thickness direction of the sealing ring body, with the upper one-way valve sealing lip on the air pressure side located below the lower one-way valve sealing lip on the air pressure side.

[0025] Along the thickness direction of the sealing ring body 3, the plane containing the upper edge of the upper one-way valve sealing lip on the pressure side is higher than or flush with the plane containing the upper edge of the sealing ring body; the plane containing the lower edge of the lower one-way valve sealing lip on the pressure side is lower than or flush with the plane containing the lower edge of the sealing ring body. In this embodiment, the plane containing the upper edge of the upper one-way valve sealing lip on the pressure side is higher than the plane containing the upper edge of the sealing ring body, and the plane containing the lower edge of the lower one-way valve sealing lip on the pressure side is lower than the plane containing the lower edge of the sealing ring body. After the upper and lower one-way valve sealing lips on the pressure side are compressed in the vertical direction, the sealing ring body can achieve a second seal. At the same time, the rebound of the upper and lower one-way valve sealing lips on the pressure side ensures the reliability of the first seal.

[0026] The angle between the upper one-way valve type sealing lip 1 on the pressure side and the plane containing the sealing ring body is 45°~60°, and the angle between the lower one-way valve type sealing lip 2 on the pressure side and the plane containing the sealing ring body is 45°~60°. In this embodiment, the angle between the upper one-way valve type sealing lip 1 on the pressure side and the plane containing the sealing ring body is 45°, and the angle between the lower one-way valve type sealing lip 2 on the pressure side and the plane containing the sealing ring body is 45°. That is, the upper one-way valve type sealing lip 1 on the pressure side extends obliquely upward at 45°, and the lower one-way valve type sealing lip 2 on the pressure side extends obliquely downward at 45°.

[0027] The outer circular surface of the sealing ring body is provided with an outer upper end static sealing lip 4 extending upward along the thickness direction and an outer lower end static sealing lip 5 extending downward along the thickness direction. Both the outer upper end static sealing lip 4 and the outer lower end static sealing lip 5 are closed circumferentially.

[0028] Along the thickness direction of the sealing ring body 3, the plane containing the upper edge of the static sealing lip on the outer upper end face is higher than or flush with the plane containing the upper edge of the sealing ring body, and the plane containing the lower edge of the static sealing lip on the outer lower end face is lower than or flush with the plane containing the lower edge of the sealing ring body.

[0029] The main body 3 of the sealing ring is an O-ring. The upper one-way valve sealing lip 1 and the lower one-way valve sealing lip 2 on the air pressure side are integrally formed with the O-ring. The upper static sealing lip 4 and the lower static sealing lip 5 on the outer side are also integrally formed with the O-ring, which ensures the integrity of the sealing ring structure and avoids gaps at the connection between the parts.

[0030] A first arc-shaped groove, recessed downwards along the thickness direction, is provided between the upper one-way valve-type sealing lip 1 on the pneumatic side and the upper arc apex of the O-ring. A second arc-shaped groove, recessed upwards along the thickness direction, is provided between the lower one-way valve-type sealing lip 2 on the pneumatic side and the lower arc apex of the O-ring. A third arc-shaped groove, recessed downwards along the thickness direction, is provided between the upper outer end face static sealing lip 4 and the upper arc apex of the O-ring. A fourth arc-shaped groove, recessed upwards along the thickness direction, is provided between the lower outer end face static sealing lip 5 and the lower arc apex of the O-ring. By providing the first arc-shaped groove and the third arc-shaped groove, it is beneficial for the upper one-way valve-type sealing lip 1 on the pneumatic side, the upper arc apex of the O-ring, and the upper outer end face static sealing lip 4 to have tight contact with the sealing cover flange. By providing the second arc-shaped groove and the fourth arc-shaped groove, it is beneficial for the lower one-way valve-type sealing lip 2 on the pneumatic side, the lower arc apex of the O-ring, and the lower outer end face static sealing lip 5 to have tight contact with the bottom of the sealing groove.

[0031] In this embodiment, the axial static sealing ring for GIS maintains the basic structure of an O-ring, retaining its mature advantages and good resilience. One-way valve-type sealing lips are provided at the upper and lower ends of the main body on the gas side. The upper one-way valve-type sealing lip on the pressure side is interference-fitted with the sealing cover flange, forming a new sealing surface and simultaneously creating a one-way valve port with the end face. Due to the lip angle design, high-pressure gas is less likely to impact and open the one-way valve port from inside the GIS, thus preventing leakage to the outside. The lower one-way valve-type sealing lip on the pressure side is interference-fitted with the sealing groove flange, forming a new sealing surface and simultaneously creating a one-way valve port with the end face. Similarly, high-pressure gas is less likely to impact and open the one-way valve port from inside the GIS, thus preventing leakage to the outside. The upper and lower static sealing lips on the outer side serve as a third static seal design. Considering the size of the sealing ring, the outward-expanding lip of the X-ring is abandoned, replaced by a small-lip static end face design, resulting in good pressure resistance. The first seal uses a one-way valve lip design, which ensures that the gas side withstands pressure in one direction exceeding that of the other. The second seal is an O-ring body, inheriting the advantages of surface sealing. The third seal, located on the outermost side, has a small lip on its end face, providing supplementary support to the first two seals. The rubber material of the sealing rings remains consistent with the original design, using EPDM rubber.

[0032] like Figure 3 As shown, in this embodiment, during use, it is installed in the sealing groove formed by the sealing cover flange 9 and the sealing groove flange 10. The upper edge of the one-way valve type sealing lip on the pneumatic side, the upper arc apex of the O-ring, and the outer upper end face static sealing lip 4 are in sealing contact with the sealing cover flange, respectively. The lower edge of the one-way valve type sealing lip on the pneumatic side, the lower arc apex of the O-ring, and the outer lower end face static sealing lip 5 are in sealing contact with the bottom of the sealing groove, thus achieving the following: Figure 4The first seal 6, the second seal 7, and the third seal 8 are shown. The upper and lower one-way valve-type sealing lips on the pressure side deform under pressure, utilizing the resulting rebound force to ensure a sealing effect. Simultaneously, the upper and lower edges of the sealing ring body make sealing contact with the sealing cover flange and the bottom of the sealing groove, respectively. The sealing ring structure of this embodiment ensures that when the gas inside the GIS exerts force on the sealing ring structure, the upper and lower one-way valve-type sealing lips on the pressure side are pressed even tighter against the sealing cover flange and the bottom of the sealing groove, further guaranteeing the reliability of the seal and preventing GIS gas leakage.

[0033] Compared with O-rings and X-rings, the sealing ring structure of this utility model has enhanced pressure resistance and, under the condition of unchanged resilience, the lip still exceeds the main seal, thereby improving sealing reliability and service life.

[0034] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. An axial static seal ring structure for GIS, characterized by: The sealing ring body (3) is provided with an upper air pressure side one-way valve type sealing lip (1) extending upwardly and obliquely toward the GIS gas side and a lower air pressure side one-way valve type sealing lip (2) extending downwardly. In the thickness direction of the sealing ring body (3), the plane where the upper edge of the upper air pressure side one-way valve type sealing lip is located is higher than or flush with the plane where the upper edge of the sealing ring body is located; the plane where the lower edge of the lower air pressure side one-way valve type sealing lip is located is lower than or flush with the plane where the lower edge of the sealing ring body is located.

2. The axial static sealing ring structure for GIS according to claim 1, characterized in that: The outer circular surface of the sealing ring body is provided with an outer side upper end surface static sealing lip (4) extending upwardly and an outer side lower end surface static sealing lip (5) extending downwardly, both of which are circumferentially closed. In the thickness direction of the sealing ring body (3), the plane where the upper edge of the outer side upper end surface static sealing lip is located is higher than or flush with the plane where the upper edge of the sealing ring body is located, and the plane where the lower edge of the outer side lower end surface static sealing lip is located is lower than or flush with the plane where the lower edge of the sealing ring body is located.

3. The axial static sealing ring structure for GIS according to claim 2, characterized in that: The sealing ring body (3) is an O-ring, and the upper air pressure side one-way valve type sealing lip (1), the lower air pressure side one-way valve type sealing lip (2) and the O-ring are integrally formed.

4. The axial static sealing ring structure for GIS according to claim 3, characterized in that: The upper air pressure side one-way valve type sealing lip (1) and the upper arc top of the O-ring are provided with a first arc-shaped groove recessed downwardly, and the lower air pressure side one-way valve type sealing lip (2) and the lower arc top of the O-ring are provided with a second arc-shaped groove recessed upwardly.

5. The axial static sealing ring structure for GIS according to claim 3, characterized in that: The outer side upper end surface static sealing lip (4) and the upper arc top of the O-ring are provided with a third arc-shaped groove recessed downwardly, and the outer side lower end surface static sealing lip (5) and the lower arc top of the O-ring are provided with a fourth arc-shaped groove recessed upwardly.

6. The axial static sealing ring structure for GIS according to claim 1, characterized in that: The angle between the upper air pressure side one-way valve type sealing lip (1) and the plane where the sealing ring body is located is 45°-60°, and the angle between the lower air pressure side one-way valve type sealing lip (2) and the plane where the sealing ring body is located is 45°-60°.

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