Device for testing performance of low-temperature vacuum multilayer heat-insulation material based on thermal protection

Abstract

The invention discloses a device for testing performance of a low-temperature vacuum multilayer heat-insulation material based on thermal protection. The device comprises a vacuum outer cover, a blind plate end cover flange, an upper protective cavity, a testing cavity, a lower protective cavity, a back pressure stabilizing device, a controllable electric heating system, a temperature and flow-rate sensing system, a liquid nitrogen filling system, a data collecting-processing system and a vacuum pumping system, wherein the upper protective cavity and the lower protective cavity are used for insulating heat leakage in the vertical direction and connected with the blind plate end cover flange of the vacuum outer cover through thin-wall steel tubes; the testing cavity is connected with the blind plate end cover flange through the same thin-wall steel tube structure as the protective cavities. An insulating material testing sample of the device can be replaced at will, the temperature distribution inside the insulating material and the evaporation rate of stored liquid under different thermal boundary temperature conditions can be measured, and the heat leakage percentage and the material apparent thermal conductivity can be further obtained by the evaporation rate.

Description

technical field [0001] The invention relates to a device for testing the performance of vacuum multilayer heat insulation materials, in particular to a performance test device for low temperature vacuum multilayer heat insulation materials based on thermal protection method. Background technique [0002] With the continuous development of industries such as aerospace, liquefied natural gas, metallurgy and chemical industry, the demand for cryogenic liquids is increasing, thus driving the demand for storage and transportation of cryogenic liquids. Vacuum multilayer insulation technology has been widely used in the field of cryogenic liquid storage due to its excellent performance. In addition, for the on-orbit storage scheme of low-Earth orbit propellant, the natural high vacuum environment of space can effectively eliminate the heat flow caused by gas heat conduction and convection, and the radiation shield in the multi-layer insulation can greatly reduce the radiation heat ...

AI Technical Summary

Problems solved by technology

Many current patents on thermal insulation test systems either measure the thermal insulation performance of thermal insulation materials in a high temperature environment, or conduct tests in a purely low temperature environment, and none of them involve vacuum multilayer thermal insulation

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