Special rotating joint for ultra-low-temperature fluid loading and unloading arm

Abstract

The invention discloses a special rotating joint for an ultra-low-temperature fluid loading and unloading arm. The rotating joint comprises an inner ring and an outer ring, wherein a steel ball raceway is arranged between the inner ring and the outer ring; a steel ball is arranged in the steel ball raceway; the left end of the outer ring is connected with an outer ring flange; the right end of the inner ring is connected with an inner ring flange; a nitrogen circulation sweeping mechanism is arranged at the steel ball raceway between the inner ring and the outer ring; a main sealing ring is arranged between the inner wall of the outer ring flange and the outer wall of the inner ring and is connected with a butterfly-shaped spring between the outer ring and the inner ring through a pressure graph; a method for separating a sealing material from a compensation piece is adopted; the main sealing ring is a tendon-groove combined type sealing ring. In an ultra-low-temperature environment, the rotating joint is still high in compensation property even if the sealing piece is contracted in cold, and the sealing reliability is guaranteed, so that the problem of leakage caused by poor sealing of a conventional rotating joint is thoroughly solved, and real zero leakage is realized.

Description

Technical field [0001] The invention relates to a fluid handling equipment, in particular to a special rotary joint for an ultra-low temperature fluid handling arm. Background technique [0002] Traditional fluid conveying equipment rotary joints are generally composed of inner ring, outer ring, balls, main seal, and auxiliary seal. The main seal generally adopts a herringbone structure with a built-in stainless steel card. Theoretically, under the action of the stainless steel card, this structure should be able to be compensated after being worn or contracted in the ultra-low temperature state, so as to ensure the tightness, but during use, it cannot achieve the ideal As a result, the reason is that if the stainless steel card is immersed in the ultra-low temperature liquid, its elasticity will be greatly reduced, and its compensation will not reach the ideal state. As a result, leakage often occurs during use, which brings hidden dangers to safe production and also causes En...

AI Technical Summary

Problems solved by technology

Theoretically, under the action of the stainless steel card, the seal should be compensated after wear or shrinkage at ultra-low temperature, so as to ensure the sealing performance, but it cannot achieve the ideal sealing performance during use. As a result, the reason is that if the stainless steel card is immersed in the ultra-low temperature liquid, its elasticity will be greatly reduced, so that its compensation cannot reach the ideal state, so that leakage often occurs during use, which brings hidden dangers to safe production and also causes environmental pollution

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