Heat-preservation die and heat-preservation construction method for ultra-low temperature pipeline

Abstract

The invention relates to a heat-preservation die and a heat-preservation construction method for an ultra-low temperature pipeline, and particularly discloses a heat-preservation die and a heat-preservation construction method for an ultra-low temperature pipeline, which are applied to a hydrogen-fueled system of a rocket. By the heat-preservation construction method for the ultra-low temperature pipeline, the phenomena of dropping, cracking, frosting and the like of a heat-preservation layer and the pipeline caused by the cooling shrinkage of the pipeline can be prevented. The method comprises the following steps: a, mounting the heat-preservation die for the ultra-low temperature pipeline on the ultra-low temperature pipeline; b, filling heat-preservation pulp into the heat-preservation die for the ultra-low temperature pipeline; c, after the heat-preservation pulp is solidified to form the heat-preservation layer, disassembling the heat-preservation die for the ultra-low temperature pipeline. According to the heat-preservation die and the heat-preservation construction method for the ultra-low temperature pipeline, a release agent and release cloth are used as a release lining, and the release time is strictly controlled, so that the forming quality of a heat-preservation material is ensured; during heat-preservation construction, the whole pipeline is coated with a special anti-freezing solution, so that the synchronism of contraction and expansion processes between different materials is ensured.

Description

technical field [0001] The invention relates to an ultra-low temperature pipeline insulation mold and an ultra-low temperature pipeline insulation construction method, in particular to an ultra-low temperature pipeline insulation mold and an ultra-low temperature pipeline insulation construction method applied to a rocket hydrogen combustion system. Background technique [0002] Fuel is the energy source for rocket launch. Internationally, liquid hydrogen is usually used as rocket fuel. After the rocket fuel is filled, the remaining hydrogen will be discharged into the atmosphere for combustion. During the discharge to combustion process, liquid hydrogen gradually turns into gas after decompression, and will absorb a large amount of heat during the process of changing from liquid to gas, causing the temperature of the transportation pipeline to drop rapidly, with a minimum of -250 °C. If the insulation of the pipeline is not in place or if it is damaged, the surface of the p...

AI Technical Summary

Problems solved by technology

During the use of the system, due to the sudden drop in temperature, the shrinkage and expansion rates of the insulation layer and the pipe are not synchronized, resulting in the insulation layer being easily broken, cracked, and falling off, resulting in frostin

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