Continuous vacuum insulation double-wall pipe

Abstract

The invention discloses a continuous vacuum insulation double-wall pipe. The continuous vacuum insulation double-wall pipe comprises a plurality of inner pipes and a plurality of outer pipes; the outer pipes sleeve the inner pipes; the two adjacent inner pipes are welded; a half pipe is welded between the two adjacent outer pipes; and a plurality of groups of insulation sliding supports and a plurality of groups of insulation fixed supports are arranged between the inner pipes and the outer pipes. The double-wall pipe is adopted and is continuous, that is, cavities between the inner pipes andthe outer pipes are continuous, so that heat loss caused by contact between the inner pipes and the outer pipes is reduced; and meanwhile, the inner pipes and the outer pipes can slide relative to each other, so that the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of double-wall pipes, and more specifically relates to a continuous vacuum heat-insulating double-wall pipe. Background technique [0002] There are ultra-low temperature pipelines (design temperature is -165°C) in the ship's LNG main engine fuel storage and supply system. At present, for pipelines of this temperature level, stainless steel tubes are used to outsource thermal insulation materials to transport low-temperature media. This method has many problems, such as it is difficult to detect pipeline leakage; the volume of pipelines with outsourcing insulation is too large. It is easy to age and damage. [0003] Some ships also use double-wall pipes, which are multi-section double-wall pipes spliced ​​together through flanges. However, when working on ships, they are in a state of long-term vibration and movement, and the flange joints are prone to displacement. At the same time, the temperature difference betwe...

AI Technical Summary

Problems solved by technology

At present, for pipelines of this temperature level, stainless steel tubes are used to outsource thermal insulation materials to transport low-temperature media. This method has many problems, such as it is difficult to detect pipeline leakage; the volume of pipelines with outsourcing insulation is too large. Easy to age and damage

[0003] Some ships also use double-wall pipes, which are multi-section double-wall pipes spliced ​​together through flanges. However, when working on ships, they are in a state of long-term vibration and movement, and the flange joints are prone to displacement. At the same time, the temperature difference between the inside and outside of the double-wall pipe is large, resulting in the difference in the expansion and contraction of the double-wall pipe inside and outside, and there is a difference in movement in the axial direction. In addition, the connection of the flange makes the inner pipe and the outer pipe connected here, which cannot achieve heat insulation effect, poor thermal insulation performance

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