Axial compensation reinforced connection structure of ultralow temperature compensator

Abstract

The invention discloses an axial compensation reinforced connection structure of an ultralow temperature compensator. The axial compensation reinforced connection structure is arranged in a shell consisting of a shell body, a left end cover and a right end cover. The axial compensation reinforced connection structure consists of a corrugated pipe and connection pipes hermetically connected at two ends. The connection pipe of the left end is fixedly connected with the left end cover, and the connection pipe of the right end is in clearance fit with an inner hole of the right end cover. One end of the connection pipe is in flange structure, and is connected with the corrugated pipe through the flange edge. Two ends of the corrugated pipe are in outwards extended axial flanging structures, the inner hole of the corrugated pipe is matched with the flange edge of the connection pipe, and a ring is sleeved on the outer edge of the flanging and hermetically connected. Through the thickened reinforced structure, the flanging of the middle-wall corrugated pipe in the middle is fully fused with a fitting, the connectors have no remarkable temperature difference during welding on the structure, and welded seam crack and internal stress are not formed, so that the strength of the welded seam is improved and the service life of the welded seam is prolonged.

Description

technical field [0001] The invention relates to a connection structure of pipe fittings, in particular, the invention relates to a connection structure of thin-wall corrugated pipes and thick-wall pipe fittings. Background technique [0002] Liquid nitrogen and liquid hydrogen are commonly used ultra-low temperature liquids. The boiling point of these liquids is very low at atmospheric pressure. For example, the boiling point temperature of liquid nitrogen at atmospheric pressure is -196°C. Due to the large temperature difference between the pipeline transporting ultra-low temperature liquid and the environment, large physical changes will inevitably occur. In order to ensure the safe operation of such pipelines in the equipment, appropriate pipeline compensation devices are installed in the pipeline to absorb or compensate the physical changes caused by the pipeline. The resulting axial displacement and stress. Usually, the axial compensation device configured in the pipel...

AI Technical Summary

Problems solved by technology

However, the prior art product is damaged because the connection joint between the bellows and the connecting pipe is easy to crack

The reason is that in the prior art, the thin-walled corrugated pipe is directly connected with the thicker pipe wall. Due to the large disparity in wall thickness, the welding structure is unreasonable, resulting in poor fusion of the welded joint. In addition, under ultra-low temperature conditions The toughness of the weld becomes poor, so the products of the prior art are prone to leakage accidents

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