A self-compensating A-type sealing ring

Abstract

The invention provides a novel self-compensation A-shaped seal ring. The seal ring comprises a seal ring substrate as well as a stainless steel metal framework and an inflation cavity which are arranged in the seal ring substrate; the cross section of the seal ring substrate is in a shape similar to A, the cavity between one end of a cross beam and the tip part of A is the inflation cavity, the stainless steel metal framework is arranged in the cross beam and the other end of A, and the tip part, namely, the lip position, of the seal ring substrate has a non-symmetrical structure; an air inlet and an air outlet are formed in positions, in the cross beam of A at the two radial ends, of the seal ring substrate, and the air inlet and the air outlet are connected with an air inlet tube and an air outlet tube respectively; the inflation cavity is connected with the air inlet tube and the air outlet tube, certain pressure is maintained in the inflation cavity all the time to extrude the lip, and self-compensation is realized; the inner wall of the inflation cavity is coated with a polyethylene plastic film, and the air tightness of the inflation cavity is guaranteed. The seal ring can perform self-compensation on reduced contact pressure in a sealed contact region due to abrasion, and the service life of a seal component is greatly prolonged.

Description

technical field [0001] The invention relates to a rubber and plastic sealing ring, in particular to a self-compensating A-type sealing ring. Background technique [0002] Sealing is an important technology used in modern mechanical engineering. The two most important indicators for evaluating sealing performance are leakage rate and friction. Seal leakage will increase system maintenance costs, pollute the environment, and cause fatal disasters such as the launch explosion of the US Space Shuttle Challenger; the wear and tear of seals not only leads to increased seal leakage, but also shortens the service life of seals, seriously restricting The realization of the design life of the service mechanical system has also caused energy waste and economic losses. According to statistics in the petrochemical field, 60% of unplanned shutdowns are caused by sealing failures, and the high incidence of sealing accidents has caused huge economic losses. [0003] Rubber and plastic dyna...

AI Technical Summary

Problems solved by technology

Seal leakage will increase system maintenance costs, pollute the environment, and cause fatal disasters such as the launch explosion of the US Space Shuttle Challenger; the wear and tear of seals not only leads to increased seal leakage, shortens the service life of seals, and seriously restricts The realization of the design life of the service mechanical system has also caused energy waste and economic losses. According to statistics in the petrochemical field, 60% of unplanned shutdowns are caused by sealing failures, and the high incidence of sealing accidents has caused huge economic losses.

[0003] Rubber and plastic dynamic seals generally adopt interference fit during installation, so there is a certain contact pressure in the seal contact area. As the running time increases, the seal will inevitably wear out, resulting in a decrease in the contact pressure in the contact area.

Reduced contact pressure increases leakage and shortens seal life

However, the existing lip seal (rotary shaft lip seal) determines that it does not have the ability to self-compensate the impact of wear from its structure.

With the complexity and extremes of the sealing application environment, the seals often work at high speed, high pressure and extreme temperature, which further aggravates the wear of the seals

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