A large gap compensation type sealing device for high temperature and autoclave

Abstract

The invention belongs to the ultra-high pressure and high temperature test technology of steel pipes, and relates to a large-gap compensation type sealing device for high-temperature and high-pressure kettles. The invention includes a sealing groove, a baffle, an auxiliary O-shaped sealing combination, an outer main sealing structure, and an inner sealing structure; the sealing groove plays the role of installing and fixing the sealing ring; the baffle plays the role of limiting and pre-tightening; The auxiliary O-ring seal combination is composed of an outer auxiliary PTFE retaining ring and a fluororubber O-ring, which acts as an auxiliary seal; the outer main seal structure includes an outer conical aluminum anti-flow ring, an outer PTFE retaining ring, and an outer large-diameter O-ring ; The inner sealing structure is composed of a single-side concave PTFE retaining ring integrated with a compensating sealing structure and an inner large-diameter O-ring. The high-temperature and autoclave large-gap compensation type sealing device of the present invention is suitable for sealing environments such as ultra-high pressure high temperature, large gap, fretting, rough surfaces, etc., and solves technical problems in the field of simulating oil casing deep well environment tests at home and abroad.

Description

technical field [0001] The invention belongs to the ultra-high pressure and high temperature test technology of steel pipes, and relates to a large-gap compensation type sealing device for high-temperature and high-pressure kettles. Background technique [0002] In the ultra-high pressure and high temperature test of petroleum steel pipes, it is necessary to apply an external pressure of 280MPa to the steel pipes, continue high temperature at 180°C, and conduct tests under complex working conditions such as tension, compression, and three-point bending at the same time. The test requires designing a radial sealing structure that can meet the following conditions at the same time: (1) The sealing surface is a rough surface; (2) It is suitable for large gap sealing (it can meet all dimensions within the error range of a certain specification test piece); (3) ) resistant to ultra-high pressure and high temperature; (4) resistant to fatigue, and the seal will not be damaged afte...

AI Technical Summary

Problems solved by technology

This type of test is still in the exploratory stage, and there is no mature sealing structure at home and abroad that can meet the test environment requirements

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