Memory alloy ring sealing device

Abstract

The invention discloses a memory alloy ring sealing device which mainly comprises an outer cylinder, a memory alloy ring and an end cover, wherein the memory alloy ring is divided into an outer memory alloy ring and an inner memory alloy ring. During temperature raising phase change, the memory alloy ring turns into the shape of the high temperature phase, the shape of the outer memory alloy ring is shrunk on the whole, and the shape of the inner memory alloy ring is swelled on the whole, so that a sealing role can be played for a liquid or gas medium in the thin-wall outer cylinder device. During temperature reducing phase change, the memory alloy ring turns into the shape of the low temperature phase, the shape of the outer memory alloy ring is swelled on the whole, and the shape of the inner memory alloy ring is shrunk on the whole, so that the sealing device can be freely disassembled. In the sealing state, the theoretical resultant force value generated on the inner surface and the outer surface of the thin-wall outer cylinder by the outer memory alloy ring and the inner memory alloy ring is zero, so that leakage risk caused by single side load deformation of the thin-wall outer cylinder can be avoided. The memory alloy ring sealing device is long in sealing life, and the sealing effect on the medium in the thin-wall outer cylinder device cannot be reduced.

Description

technical field [0001] The invention belongs to the technical field of sealing, and in particular relates to a memory alloy ring sealing device. Background technique [0002] At present, there are mainly two sealing methods for the liquid medium or gas medium in the thin-walled outer cylinder device. One is the sealing method with a built-in elastic rubber ring. First, put the elastic rubber ring into the radial sealing groove of the shaft parts; then, insert the shaft parts and the elastic rubber ring into the inner hole of the thin-walled outer cylinder together, and realize radial sealing on the inner cylindrical surface of the thin-walled outer cylinder. seal against contact. When the radial contact pressure is too large, it will cause the inner side of the sealing interface of the thin-walled outer cylinder to be deformed by force and cause leakage risk. Leakage risk, these consequences will reduce its sealing performance. Second, the sealing method of the external m...

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Problems solved by technology

However, the sealing methods involved in these patents are mainly suitable for thick-walled connected pipes, but cannot be applied to the sealing of thin-walled outer cylinder devices

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