A sealing structure for a cavity hole

Abstract

The invention discloses a structure for sealing a cavity hole. The structure comprises an annular groove (101) machined on a cavity (1), a shape memory alloy ring (3) and a sealing cap (4), wherein the sealing cap is provided with the lower edge (401) with the wall thickness of 0.1-0.3 mm and can be matched with the annular groove (101) of the cavity, the shape memory alloy ring (3) is arranged outside the lower edge (401) of the sealing cap in a sleeving mode, after being heated, the inner diameter of the shape memory alloy ring (3) is shrunk so as to extrude the lower edge (401) of the sealing cap, the inner wall of the sealing cap and the inner wall of the annular groove (101) of the cavity form a sealing surface, so that the cavity hole is sealed, and corresponding shape memory alloy rings and sealing caps can be selected according to the shapes of the annular grooves for sealing different section holes. According to the structure for sealing the cavity hole, the structure is simple, the heating temperature is low, the influence on the performance and the service life of parts in the cavity is small, sealing is still reliable when the environment temperature changes, and the sealed hole can be prevented from being polluted by the outside environment.

Description

technical field [0001] The invention relates to sealing technology, in particular to a sealing structure for cavity holes. The sealing structure is easy to operate, the heating temperature is low, and has little effect on the performance and life of the parts in the cavity, and the sealing is still reliable when the ambient temperature changes. Background technique [0002] In engineering applications, there are often high requirements for the airtightness of the assembly cavity in many occasions. For example, in the packaging of electronic components, good airtightness plays a very important role in improving its life and anti-interference from the environment. At present, in such occasions where packaging is required, the local airtight packaging of screws and pin holes is mainly realized by rubber sealing rings or glue sealing. This sealing method not only has low air sealing performance, but also has the problem of aging of the rubber sealing ring and sealant and its s...

AI Technical Summary

Problems solved by technology

[0004] In short, the existing cavity hole sealing technology has the following problems: 1) The high and low temperature sealing reliability of the rubber ring seal and the glued seal is poor; Rework; 3) Direct use of shape memory alloy rings to seal the cavity and fittings is easily affected by the difference in thermal expansion coefficient between the two

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