A large diameter ultra-low temperature dynamic rotary sealing joint

Abstract

The invention discloses a large-diameter ultra-low temperature dynamic rotary sealing joint, which includes an inner ring flange, an inner ring, an outer ring, an outer ring flange, balls, an isolation ring, a replaceable slideway, and a medium flow blocking ring; the inner ring method The flange is fixed on the inner ring by bolts, and there is a fluid medium seal and a nitrogen seal between the inner ring flange and the inner ring; the outer ring flange is fixed on the outer ring by bolts, and a nitrogen seal is provided between the outer ring flange and the outer ring; The inner ring and the outer ring are respectively provided with slideway fixing grooves, and the replaceable slideways are set in the slideway fixing grooves to form a ball movement slideway; the balls are placed in the replaceable slideways; the inner and outer rings are equipped with medium flow blocking rings ; There is a seal between the outer ring and the inner ring flange to avoid the entry of dust and water vapor; the inner and outer ring flanges are respectively equipped with leak detection ports for dynamic and static main seals; the inner ring flange and the outer ring are equipped with nitrogen purge channels, through The flow of nitrogen gas between the inner ring cavity and the slideway forms a nitrogen purge circuit. The invention improves the reliability of joint use.

Description

technical field [0001] The invention belongs to the core component field of an LNG loading and unloading arm, in particular to a large-diameter ultra-low temperature dynamic rotary sealing joint. Background technique [0002] At present, the transportation and loading and unloading of media between LNG ships and storage areas are mainly realized through large-caliber loading and unloading arms. During the transportation process, the loading and unloading arms are required to be able to rotate with multiple degrees of freedom. It adapts to the LNG ultra-low temperature environment and the working condition of rotating dynamic seal to prevent the leakage of cryogenic fluid. [0003] The structure of the rotary joint essentially determines its bearing capacity and performance. Chinese patent CN103104767A discloses a special ultra-low temperature rotary joint. The structure of the nitrogen purge channel of the joint is complicated, and the ball is arranged between the outer ring...

AI Technical Summary

Problems solved by technology

[0003] The structure of the rotary joint essentially determines its bearing capacity and performance. Chinese patent CN103104767A discloses a special ultra-low temperature rotary joint. The structure of the nitrogen purge channel of the joint is complicated, and the ball is arranged between the outer ring and the inner ring. On the road, the friction between the balls in the rotary joint may easily cause motion jamming, and at the same time, long-term work may easily cause serious wear of the raceway between the inner ring and the outer ring, reducing the service life; under low temperature conditions, the cold deformation of the raceway is large, and it is easy to get stuck Balls, which affect the movement of the balls

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