A liquid nitrogen refrigeration device composite variable temperature refrigeration temperature coupling mechanism

Abstract

The invention relates to a refrigeration temperature coupling mechanism of a refrigerator, in particular to a compound variable temperature refrigeration temperature coupling mechanism of a liquid nitrogen refrigeration device; it belongs to the field of space low temperature technology. It includes a detector Dewar, a flexible composite heat-conducting material, and a cold head axial compression mechanism, wherein the detector Dewar includes a fixed screw compression nut 2, a temperature adjustment gap composition 7, a detector 9, and a detector Dewar outer barrel 10 , inner core 11 and vacuum insulation space 12; the axial compression mechanism of the cold head includes a dynamic compression screw sleeve 1, a guide positioning ring 3, a cold storage tube 4, liquid nitrogen 5, and a cold head 6; flexible composite heat-conducting materials include more than 2 kinds Metal cotton and non-metal cotton are combined; due to the use of adjustable axial cold storage tubes and cold head compression mechanisms, the axial displacement of the cold head is increased and the transmission path of cold energy is reduced. The vacuum degree is better than 1×10-2Pa, so that the heat leakage of interstitial gas molecules is only on the order of milliwatts, avoiding the temperature loss caused by heat conduction of residual gas molecules, improving the cooling efficiency, and obtaining lower cooling temperature and larger cooling capacity .

Description

technical field [0001] The invention relates to a refrigeration temperature coupling mechanism of a refrigerator, in particular to a compound variable temperature refrigeration temperature coupling mechanism of a liquid nitrogen refrigeration device; it 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 usin...

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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