A cryogenic refrigeration system with ultra-low disturbance and its control method

By designing an ultra-low disturbance cryogenic refrigeration system, utilizing a vacuum environment and active temperature control, the problems of vibration interference and heat loss in highly vibration-sensitive experiments with cryogenic refrigeration technology were solved, achieving precision refrigeration and low-cost control below -150℃.

CN117168042BActive Publication Date: 2026-03-06NATIONAL INSTITUTE OF METROLOGY CHINA
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Patent Information

Application Number
CN202311327921.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-13
Publication Date
2026-03-06
Estimated Expiration
2043-10-13

AI Technical Summary

Technical Problem

Existing cryogenic refrigeration technology introduces vibration interference in experiments with high vibration sensitivity, and the turbulent vibration caused by liquid nitrogen flow affects the stability and precision of the system. At the same time, the heat loss during the transmission process is large and the cost is high.

Method used

An ultra-low disturbance cryogenic refrigeration system was designed, including a cryogenic gas generator, a cryogenic gas transmission system, and a cryogenic working space. By using a vacuum environment and active temperature control, transmission loss is reduced, and cryogenic gas is used for refrigeration. Precise temperature control is achieved by combining temperature sensors and control circuits.

Benefits of technology

It achieves ultra-low temperature refrigeration below -150℃, reduces the vibration impact of the refrigeration structure on the working space, reduces heat loss during transmission, improves temperature control accuracy, and reduces operating costs.

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Abstract

A cryogenic refrigeration system and control method with ultra-low disturbance can reduce the impact of vibration on the workspace, reduce heat loss during transmission, and achieve cryogenic cooling of the controlled object to -150°C. o Below 100°C and under long-term precise control, this system avoids vibration interference caused by cryogenic liquid refrigeration, resulting in lower operating costs and high temperature control accuracy. The gas collection pipe is placed in liquid refrigerant. Power is supplied to the gas generator to vaporize the liquid refrigerant, producing cryogenic refrigeration gas, which is collected through the gas collection pipe. A cryogenic gas insulated transmission pipe introduces the refrigeration gas into the ultra-low temperature refrigeration working space. The object being refrigerated is placed in an ultra-high vacuum environment. Temperature control is achieved through heat exchange between the active temperature control layer and the object via thermal radiation. A temperature sensor measures the temperature of the active temperature control layer, and the control signal output by the temperature controller is fed back to the power supply of the cryogenic gas generator through the refrigeration logic control circuit, achieving high-precision ultra-low temperature control of the object.
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