A Mechanical Vibration-Isolated Extremely Low Temperature Refrigeration System Without Liquid Helium Consumption

Abstract

The invention belongs to the technical field of ultra-low temperature refrigeration equipment, in particular to a mechanical vibration isolation non-liquid helium consumption ultra-low temperature refrigeration system. The system of the invention includes: a closed-cycle refrigerator system, a helium heat exchange gas refrigeration vibration isolation system, a very low temperature throttle valve refrigeration system and a temperature feedback control system. The refrigeration method provided by the present invention can achieve extremely low temperatures as low as 1.4 K (based on helium 4 medium) or 0.2 K (based on helium 3 medium) without consuming liquid helium, and can effectively isolate closed-cycle refrigerators The inherent mechanical vibration of the system; the variable temperature regulation can be realized through the temperature feedback control system. The invention is also applicable to the ultra-high vacuum environment requiring high-temperature baking.

Description

technical field [0001] The invention belongs to the technical field of extremely low temperature refrigeration equipment, and particularly relates to a liquid helium consumption-free extremely low temperature refrigeration device for mechanical vibration isolation. Background technique [0002] The extremely low temperature environment refers to the environment that is lower than the gas-liquid phase transition temperature of helium 4 under normal pressure, which is 4.2 K. It has important applications in the fields of physics, chemistry, materials, biology, national defense, and information. Many high-end precision scientific research and technical applications require not only an extremely low temperature environment but also a low vibration environment and a vacuum, or even an ultra-high vacuum environment. At present, in the field of extremely low temperature equipment, there are refrigeration systems that can obtain extremely low temperature environments and low vibrati...

AI Technical Summary

Problems solved by technology

However, the operation of this type of closed-cycle refrigerator system itself will introduce non-negligible low-frequency mechanical vibrations, which limits its application in fields that require low vibration and extremely low temperature environments at the same time.

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