CN111396555A

CN111396555A - Special-shaped sealing ring

Info

Publication number: CN111396555A
Application number: CN202010304249.7A
Authority: CN
Inventors: 李明道; 王志成; 杨磊; 赵岩; 史善哲; 翟登辉; 路光辉; 雍明超; 包伟; 许丹; 曾国辉; 王行; 云亚文; 高培源; 陈磊; 戚振伟; 卢声
Original assignee: State Grid Corp of China SGCC; Xuji Group Co Ltd; State Grid Hebei Electric Power Co Ltd; XJ Electric Co Ltd; Xuchang XJ Software Technology Co Ltd
Current assignee: State Grid Corp of China SGCC; Xuji Group Co Ltd; State Grid Hebei Electric Power Co Ltd; XJ Electric Co Ltd; Xuchang XJ Software Technology Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-07-10

Abstract

The invention relates to a sealing ring for sealing the inside and outside of the connecting surface of a container, the cross section of the base body of the sealing ring is O-shaped, and the front end surface and the rear end surface of the O-shaped base body are respectively provided with a plane characteristic. In the using process, under the condition of the same material, hardness and compression ratio, compared with a common O-shaped sealing ring and a rectangular O-shaped sealing ring, the surface contact pressure of the base material of the sealing ring is larger, and the specific surface pressure is achieved (related experiments at home and abroad show that the surface contact pressure for ensuring good rubber sealing is generally in the range of 0.5-1.5MPa, and experiments show that the pressure is preferably 1.3MPa for common rubber) more areas are obtained, so that the better sealing effect is ensured. The invention has simple structure and reliable sealing, and is not only suitable for static sealing, but also suitable for dynamic sealing.

Description

Special-shaped sealing ring

Technical Field

The invention relates to the technical field of sealing, in particular to a special-shaped O-shaped sealing ring which is particularly suitable for application occasions of detachable static sealing and dynamic sealing. Such as: gas insulated switchgear (medium-pressure gas-filled gas insulated switchgear (C-GIS), GIS, HGIS, etc.), sensors applied in high-temperature and high-humidity occasions, or secondary equipment, etc.

Technical Field

Gas insulated switchgear is a switchgear that encloses high voltage components such as bus bars, circuit breakers, disconnectors, transformers, power cables, etc. within a housing filled with a gas at a relatively low pressure. It has the following advantages: firstly, SF6, N2, CO2 or environment-friendly gas insulation are utilized, the size and the occupied area of the gas-filled cabinet are greatly reduced, and the development towards miniaturization is facilitated. And secondly, the high-voltage element is sealed in the shell filled with SF6 gas or other gases, so that the high-voltage element is not influenced by the external environment. And a maintenance-free vacuum circuit breaker is matched, so that the reliability is greatly improved.

Gas insulated switchgear can be used in extremely harsh environmental conditions. Such as large temperature change and high humidity environment (such as a wet and hot area), high temperature and low temperature area (such as desert area and south and north polar area), places containing natural substances (such as coastal salt fog and industrial dust) or chemical corrosive substances (chemical plants and oil refineries) in the environment, seismic regions, places with vibration, high altitude areas and places with limited installation. The service life of the gas insulated switchgear is generally about 30 years. The annual leakage rate of the insulating gas (typically 0.5%/Y and below) has been the focus of attention of various manufacturers and users. A common element to achieve a reliable seal is a seal ring. Structurally, single-layer sealing is used as a main part, and the compression rate is generally 10% -20%. There are also those that employ a double seal structure.

After the gas insulated switchgear operates for a period of time, the problem that annual leakage amount exceeds the standard often occurs, and even the gas insulated switchgear operates in a fault. Analysis shows that the common sealing ring is easy to deform after being extruded by external force due to simple structure, low strength and insufficient elasticity, and is easy to age after being used for a long time, and the hardness of the aged sealing ring is increased and the elasticity is weakened, so that the sealing performance is reduced and even the sealing ring is ineffective. Therefore, it is necessary to provide a seal ring having a stronger sealing performance to solve the above problems, based on the conventional seal ring.

SUMMARY OF THE PATENT FOR INVENTION

The technical problem solved by the invention is as follows: on the basis of the existing O-shaped sealing ring, the sealing ring with better sealing effect is provided.

The technical scheme of the invention is as follows: the sealing ring is provided with an annular base body with a rectangular circular section, the inner end surface and the outer end surface of the annular base body are respectively provided with a linear cambered surface, and the straight lines on the inner side and the outer side of the rectangular circular section can be parallel or present a specific angle.

The beneficial technical effects of the invention are as follows: because the inner end and the outer end of the traditional O-shaped sealing ring are provided with straight line cambered surfaces. During use, the two arc line parts are respectively pressed on the two contact surfaces to form two annular closed areas. Under the condition of the same material, hardness and compression ratio, compared with a common O-shaped sealing ring and a rectangular O-shaped sealing ring, the surface contact pressure of a base material of the sealing ring is larger, and the area reaching the specific surface pressure (related experiments at home and abroad show that the surface contact pressure for ensuring the good sealing of rubber is generally in the range of 0.5-1.5MPa, and experiments show that the pressure is preferably 1.3MPa for the common rubber) is larger and more continuous, so that the better sealing effect is ensured.

Drawings

FIG. 1 is a schematic view of a contour seal ring;

FIG. 2 is a further embodiment of a contour seal ring;

FIG. 3 is a further embodiment of a contour seal ring;

FIG. 4 is a further embodiment of a contour seal ring;

description of reference numerals: the base body comprises a cross section 1, an arc line 2, a straight line 3 and an arc transition 4.

Detailed Description

As shown in fig. 5, an application of the special-shaped sealing ring mainly includes a cover plate 5, a sealing ring 6, and a fixing disc 7.

The sealing ring 6 is placed in a sealing groove in the fixed disk 7, the cover plate 5 is fixedly connected with the fixed disk 7 through screws, and the sealing ring 6 is compressed and deformed. The sealing ring 6, the cover plate 5 and the fixed disc 7 are contacted and deformed to generate contact pressure, and the area more than 1.3MPa is continuous, so that the sealing is reliable.

Fig. 2, 3 and 4 show other embodiments of the invention.

The seal shown in fig. 1 is modified based on a rectangular O-ring. According to the specific improvement scheme, an arc line 1 is additionally arranged on and below the rectangular cross section of the rectangular O-shaped sealing ring respectively, and the contact positions of the arc line 1 and the straight line 3 have the characteristic of arc transition 4, so that the cross section is in an oblong shape (the circle is tangent to the straight line), the oblong sealing ring can obtain a larger compression ratio, and the purpose of more reliable sealing is achieved. The invention is improved on the basis of the common rectangular sealing ring. Compared with a rectangular sealing ring and an O-shaped sealing ring, the compression ratio of the rectangular sealing ring is equivalent, the pressure of the sealing contact surface is larger, the area of specific surface pressure is larger and more continuous, and the purpose of more reliable sealing performance compared with the common rectangular sealing ring is achieved. The arc transition 4 can effectively avoid the occurrence of the squeezing condition formed by the contact surfaces of the cover plate 5 and the fixed disk 7 during the installation process. The sealing ring shown in fig. 1 is suitable for the occasion of detachable static sealing.

Fig. 2 is a transverse arrangement of fig. 1. The seal ring shown in fig. 2 is suitable for dynamic sealing applications.

Fig. 3 is a modification of the seal ring shown in fig. 1. Characterized in that the straight lines (2) on both sides of the cross section (4) of the oblong substrate exhibit a specific angle. The compression ratio of the arc line 1, the straight line 3 and the arc transition 4 on the section of the sealing ring is larger, and the sealing is more reliable. The application is similar to the seal ring shown in fig. 1. Fig. 3 may also have a transverse arrangement. Application similar to the sealing ring shown in figure 2

Fig. 4 is another modification of the seal ring shown in fig. 1. The device is characterized in that a cavity is arranged at the geometric center of the cross section (4) of the rectangular circular substrate, and high-pressure gas is filled in the cavity. The high-pressure gas can obviously improve the contact pressure distribution condition between the contact surface and the inner part of the sealing ring substrate, so that the contact pressure is more uniform, the sealing area is more continuous, and the sealing effect is better.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes and modifications can be made by workers without departing from the spirit and scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and the scope of protection thereof must be determined by the scope of claims.

Claims

1. A special-shaped sealing ring is provided with a rectangular and circular base body section (4), and is characterized by comprising an arc line (1), a straight line (2), an arc transition (3) and the like; the upper arc line and the lower arc line (1) are respectively pressed on the two contact surfaces to form an annular sealing area.

2. Rectangular-round base section (4) according to claim 1, characterized in that the inside of the rectangular-round section (4) is entirely of rubber material. The center position can be provided with a cavity, and the cavity is filled with high-pressure gas.

3. Rectangular-round base section (4) according to claim 1, characterized in that the rectangular-round section (4) can be arranged transversely to adapt to the dynamic sealing conditions.

4. An arc (1) as claimed in claim 1, characterized in that the arc (1) has its centre at the vertical of the geometric centre of the rectangular circular base section (4).

5. A line (2) as claimed in claim 1, characterized in that the lines (2) on both sides of the rectangular circular base section (4) are either parallel or exhibit a certain angle.

6. The circular arc transition (3) as claimed in claim 1, wherein the circular arc transition (3) is provided at the intersection of the arc line (1) and the straight line (2).