A telescopic compensation structure suitable for cryogenic insulation pipes

Abstract

The invention relates to a telescopic compensation structure suitable for a low-temperature heat insulation tube. The telescopic compensation structure comprises a protecting sleeve tube component arranged between inner tubes and an outer tube of the low-temperature heat insulation tube. The protecting sleeve tube component comprises a corrugated-tube-shaped expansion joint and a protecting sleeve tube. The expansion joint is arranged in the protecting sleeve tube. The expansion joint is used for connecting of the two sections of inner tubes, and sealing is carried out at the connecting portion. The two ends of the protecting sleeve tube are provided with annular supporting plates and fixing plates respectively and are connected with the inner tubes. The supporting plates are fixedly connected with the inner tubes in a spot-welding mode. The fixing plates are fixedly connected with the inner tubes in a full-welding mode. At least two through holes which are distributed in the periphery direction are formed in the tube wall of the protecting sleeve tube. A plurality of evenly-formed through holes are formed in the supporting plates and the fixing plates. Good telescopic compensating capacity is achieved, the basic rigidity using requirements can be met, complete washing can be conveniently carried out on the outer portion of the expanding joint, so that impurities such as grease are removed, and the problem that a dead corner evacuating cannot be solved easily is effectively avoided.

Description

technical field [0001] The invention relates to the fields of long-distance and large-flow transportation of various low-temperature media such as air separation equipment and LNG filling stations, such as liquid oxygen, liquid nitrogen, and liquid argon, and particularly relates to a telescopic compensation structure suitable for low-temperature insulation pipes. Background technique [0002] In order to compensate the thermal expansion and contraction caused by the influence of temperature difference on the cryogenic insulation pipe, expansion and contraction compensation devices are usually installed on the inner or outer pipe. The traditional compensation structure generally uses metal corrugated hoses. in the attached figure 1 In the metal corrugated hose, because the corrugated net sleeve is added to the outside, although it has played a certain role in improving the rigidity, but at the same time, because both ends have been fixed, it has lost its due compensation fun...

AI Technical Summary

Problems solved by technology

in the attached figure 1 In the metal corrugated hose, because the corrugated net sleeve is added to the outside, although it has played a certain role in improving the rigidity, but at the same time, because both ends have been fixed, it has lost its due compensation function, that is, it is difficult to have sufficient expansion and contraction. In addition, due to the existence of these corrugated mesh sleeves, there is no way to check and clean the grease on the internal corrugated section. When vacuuming the insulation tube, there will be local dead corners that are difficult to evacuate completely, which will affect the vacuuming effect.

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