Performance testing device for MLI (multilayer insulation) material and composite insulation material

Abstract

The invention discloses a performance testing device for an MLI (multilayer insulation) material and a composite insulation material. The device comprises a low-temperature device, cold radiation screens and a calorimeter, wherein the low-temperature device comprises a vacuum cover forming an accommodating cavity and a refrigerator provided with a primary cold head and a secondary cold head, and the primary cold head and the secondary cold head are located in the vacuum cover; the cold radiation cold screens are located between a primary cold screen and a secondary cold screen; the calorimetercomprises the primary cold screen suspended inside the vacuum cover and thermally connected with the primary cold head through a copper braid, the secondary cold screen located inside the primary cold screen and a heat conducting rod with one end connected with the secondary cold head and the other end connected with the inner side surface of the secondary cold screen; the measured MLI material covers the outer side surface of the secondary cold shield, and thermal insulation performance of the measured MLI material is obtained by measuring the heat flow rate of the heat conducting rod. The problems of resource waste and large testing error caused by the fact that apparent thermal conductivity is tested according to low-temperature liquid evaporation rate of an existing composite multilayer insulation material performance testing system can be effectively solved.

Description

technical field [0001] The invention relates to the field of low-temperature heat insulation, and more specifically relates to a performance testing device for multilayer heat insulation materials and composite heat insulation materials. Background technique [0002] Cryogenic technology is widely used in the fields of life, scientific research, industry and aerospace. Cryogenic liquid storage is the basis for the application of cryogenic technology. During the storage of deep cryogenic liquids such as liquid hydrogen and liquid helium, the ordinary vacuum insulation method cannot effectively control the heat transfer. Generally, the method of coating multi-layer insulation materials under vacuum and adding a radiation copper screen is used to reduce radiation. Heat leakage to eliminate gas convection heat transfer. Passive insulation technology is the basis for cryogenic liquid storage. High-vacuum composite insulation not only has excellent thermal insulation effect, bu...

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Problems solved by technology

The equipment that can measure this composite insulation method has not yet appeared, and the existing ones can only evaluate the insulation performance of Dewar through the rough estimation of internal low-temperature liquid evaporation

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