Connecting structure of low-temperature pipeline and valve

Abstract

The invention discloses a connecting structure of a low-temperature pipeline and a valve, and the connecting structure has a good cold-insulation effect and can release the stress in the connecting part of a valve body and the low-temperature pipeline. The connecting structure comprises the valve body, an inner pipe fitting, an outer pipe fitting, a vacuum heat-insulation chamber and an end socket, wherein the vacuum heat-insulation chamber is arranged between the inner pipe fitting and the outer pipe fitting; the end socket is used for blocking the vacuum heat-insulation chamber; a joint is sleeved on the outer pipe fitting; a seal glue is arranged between the joint and the end socket; the joint is provided with a mounting plate and an extending boss; the valve body is provided with a connecting plate and a mounting hole; the mounting plate and the connecting plate are tightened together; the extending boss, the inner pipe fitting, the outer pipe fitting and the end socket extend into the mounting hole; an end surface seal ring is arranged among the extending boss and the end socket as well as the bottom of the mounting hole; a side surface seal ring is arranged between the extending boss and the side wall of the mounting hole; the outer wall of the end part of the extending boss is provided with a step at the outer surface of the side surface seal ring; a buffer chamber is arranged among the step, the end socket and the side wall of the mounting hole; and the side wall of the mounting hole is provided with a pressure leakage hole. The connecting structure ensures that the connection between the valve body and the low-temperature pipeline is more safe and reliable.

Description

technical field [0001] The invention relates to a low temperature pipeline, in particular to a connection structure between a low temperature pipeline and a valve. Background technique [0002] Liquefied Natural Gas (Liquefied Natural Gas, usually abbreviated as LNG) filling stations need to use a large number of valves. The reliability, safety and cold preservation effect of the connection between valves and low-temperature pipelines are important factors to measure the connection structure of valves and low-temperature pipelines. index. The connection structure between the valve and the low-temperature pipeline currently used is relatively simple, and it is usually directly welded. The end of the welding seam will fail due to the rapid temperature change, and it will also cause the leakage of the cryogenic pipeline. As we all know, after the cryogenic pipeline leaks, the natural gas in the cryogenic pipeline escapes into the atmosphere, which not only causes waste of res...

AI Technical Summary

Problems solved by technology

The connection structure between the valve and the low-temperature pipeline currently used is relatively simple, and it is usually directly welded. The end of the weld fails due to the sharp change in temperature, and it will also cause leakage of the cryogenic pipeline

As we all know, after the low-temperature pipeline leaks, the natural gas in the low-temperature pipeline escapes into the atmosphere, which not only causes waste of resources, but also pollutes the surrounding environment

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