Seal ring

Abstract

The invention discloses a seal ring, which comprises a ring body. A gap extending along the circumference direction is arranged on the inner side of the ring body, two circumferential sides of the gap form a large outer ring face and a small outer ring face respectively, and the radial width of the large outer ring face is larger than that of the small outer ring face. The seal ring has pressure sealing performance and active sealing performance. When abnormal situations occur in sealing connection and designed sealing conditions are not met to enable normal pressure sealing to be invalid, the seal ring can compensate, generate secondary sealing and enable a sealing structure to have large 'redundancy', thereby improving reliability. Even if other structural parts cannot exert design functions, a sealing function of an originally-designed rectangular ring body can be kept. The rectangular seal ring replaces an existing flange completely, and is reasonable in structure, convenient to use and low in cost, can be used for a novel seal flange and the existing flange, and can be used for sealing connection of a pressure gas pipeline except a flange connector.

Description

technical field [0001] The invention relates to a sealing ring. Background technique [0002] There are various structural forms of flange joints. Most of the joints are "passive" seals under the premise of ensuring that the sealing structure meets the requirements of design, manufacture and maintenance, that is, the necessary compression of the sealing ring in the joint must be maintained under working conditions. Rate. Once the compression rate is reduced due to installation problems or loose installation, the sealing effect of the joint will be reduced, and this phenomenon is more significant for the most difficult airtight seal. Once the seal of the joint fails during use, it will cause leakage. For example, the air brake piping system of the railway wagon running on the line in our country is affected by the installation, use and maintenance. Leakage is common, especially in the cold areas of our country. The problem that cannot be solved for a long time has seriously...

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is: when the installation conditions meet the design requirements, after the "E"-shaped sealing ring is installed in the corresponding part of the flange, because the joint body is rigidly connected, the sealing ring is compacted and the "E"-shaped ring is compressed , shaped into a "rectangular" rubber gasket

When there is a gap in the sealing due to installation problems, deformation of the flange body or loosening of the fastening bolts, the pressure gas enters the gap between the two joint bodies and cannot enter the ventilation groove, so the pressure air can only exert pressure on the upper lip , so that there is a gap between the sealing ring and the joint body and a large amount of leakage occurs. It can be seen that the leakage is mainly caused by the unreasonable design of the sealing ring and the joint body

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