Air-gap-type thermal switch applied to extremely low temperature refrigerator and heat conducting method thereof

Abstract

The invention discloses an air-gap-type thermal switch applied to an extremely low temperature refrigerator. The air-gap-type thermal switch applied to the extremely low temperature refrigerator comprises an adsorption pump; a first cylinder; a second cylinder; a heating meter installed on the adsorption pump; a support cylinder located between the first cylinder and the second cylinder and for connecting the both, wherein a gap is installed in the support cylinder; the adsorption pump communicates with the gap through a connecting pipe and forms a closed cavity, and the closed cavity is filled with the working medium gas. The air-gap-type thermal switch is capable of achieving the long-playing, high frequency and reliable alternate breakover and disconnection of the thermal transmission between the extremely low temperature refrigerator and a previous pre-cooler, and is extensively applied to the technical field of the space extremely low temperature refrigeration. In addition, the invention further provides a method for achieving the heat-conducting by using the air-gap-type thermal switch, and the method develops a new route for the long-playing and reliable alternate breakover and disconnection of the thermal transmission under the extremely low temperature conditions.

Description

technical field [0001] The invention relates to the technical field of ultra-low temperature refrigeration, in particular to an air-gap thermal switch applied to an ultra-low temperature refrigerator and a heat conduction method thereof. Background technique [0002] Extremely low temperature refrigeration technology is an important branch of cryogenic engineering, which mainly provides cold sources with a temperature below 1K for relevant application places (note: extremely low temperature in this article refers to mK-level temperature, 1mK=0.001K). [0003] With the continuous development of space technology, the extremely low temperature of space refrigeration is increasingly becoming a necessity for many researches in the fields of microgravity basic physics, space astronomy, space environment and space physics, earth science, new technologies for space applications, and deep space exploration. One of the conditions, for example: using the space infrared detection system...

AI Technical Summary

Problems solved by technology

[0005] Due to the large number of alternate conduction and disconnection of heat transfer between the ultra-low temperature refrigerator and the pre-cooling refrigerator, the reliability and life of the thermal switch are very high. However, the existing thermal switch, whether it is an air-gap type , memory alloy type, or two-way shifting type cannot work reliably for a long time under extremely low temperature conditions.

Images