Flexible composite heat conducting material for liquid nitrogen refrigerating apparatus

Abstract

The invention relates to a composite material for a liquid nitrogen refrigerating device, which belongs to the technical field of space low temperature. A flexible composite heat conducting material 8 consists of micron level copper wire cotton, aluminum wire cotton and degreased cotton and is prepared by the following processes: using an electronic scale with the precision of 1 milligram to weigh certain quantity of the copper wire cotton, the aluminum wire cotton and the degreased cotton to perform more than 50 times of even mixing, and making use of the resistance thermal effect of the degreased cotton to perform the coupling at a refrigerating temperature of between 140 and 150 K under the action of the same pressing force. The compounding of the copper wire cotton and the aluminum wire cotton comprises more than 50 times of even mixing and is applicable to the coupling at a refrigerating temperature of between 96 and 105 K; and the compounding of the copper wire cotton, the degreased cotton and the aluminum wire cotton is suitable for the coupling at the refrigerating temperature of between 140 and 150 K. The lengths of the copper wire cotton and the aluminum wire cotton in the mixing process is kept between 8 and 10 millimeters; the flexible composite heat conducting materials with different mixture ratios are made into 'cake' shapes with the diameter phi of 12 millimeters to perform filling; besides, the composite material changes the components of the heat conducting material between the cold end and the hot end of a multi-way detector and the thickness of an equivalent weight layer simultaneously to generate different coupling temperatures.

Description

technical field [0001] The invention relates to a flexible composite material, in particular to a flexible composite heat-conducting material for a liquid nitrogen refrigeration device, and belongs to the field of space low temperature technology. Background technique [0002] Liquid nitrogen refrigeration devices and detectors require coupling mechanisms with small geometric dimensions, high transmission efficiency, and adjustable refrigeration temperature. The key to achieving this goal is to use axial pressing force to change or maintain flexible composite heat-conducting materials in a limited space. Equivalent layer thickness, to achieve the best coupling of different refrigeration temperature points. It is difficult to achieve the refrigeration temperature above 140K by using a single metal wool heat-conducting material structure, but it is possible to achieve a refrigeration temperature above 140K by using a single non-metallic wool heat-conducting material, but the c...

AI Technical Summary

Problems solved by technology

It is difficult to achieve the purpose of cooling above 140K by using a single metal wool heat-conducting material structure, while using a single non-metallic cotton heat-conducting material can reach a refrigeration temperature above 140K, but the cooling time needs to be more than 5 hours, and the loss of liquid nitrogen increases

Reduce effective working time, not suitable for use in refrigeration devices with multiple outputs and different refrigeration temperatures, such as liquid nitrogen refrigeration devices, micro throttling refrigerators and solid refrigerators

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