Brayton refrigeration cycle low-temperature box

Abstract

The invention discloses a Brayton refrigeration cycle low-temperature box. The Brayton refrigeration cycle low-temperature box comprises a box body, a heat regenerator used for heat exchange between low-temperature nitrogen and high-temperature nitrogen, a turbine compressor, an expansion machine, an aftercooler, a cooler and a high-speed motor, wherein the heat regenerator is provided with a high-temperature inlet, a high-temperature outlet, a low-temperature inlet and a low-temperature outlet; a power shaft of the high-speed motor is connected with a shaft of the turbine compressor and drives the turbine compressor; the other end of the power shaft of the high-speed motor stretches into the expansion machine and is connected with an impeller; and an inlet of the expansion machine faces the impeller. According to the Brayton refrigeration cycle low-temperature box, nitrogen serves as a refrigeration working medium, and pollution is avoided; and the pneumatic bearing suspension technology is adopted, friction is completely avoided, and the efficiency is higher than that of an oil lubrication compressor. The rotating speed of the turbine compressor is adjustable, a system is stableand reliable, the requirement for the wider temperature in the box is met, and the requirement for various refrigeration temperatures can be met through one box. According to the Brayton refrigerationcycle low-temperature box, the power shaft of the high-speed motor is driven to rotate when nitrogen expands, and therefore the power of the high-speed motor can be reduced.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a low-temperature box. Background technique [0002] The current low temperature box usually adopts simple cascade refrigeration or mixed working medium natural cascade refrigeration to achieve a low temperature below -80°C. [0003] Simple cascade refrigeration requires at least two sets of refrigeration cycles to work together, with complex structure, poor reliability, and difficult maintenance and maintenance. [0004] Mixed working fluid natural cascade refrigeration uses mixed working fluid, the control system is relatively complicated, and once the mixed working fluid leaks, the refrigerant composition will change, which will have a great impact on the refrigeration effect and cannot be supplemented. Drain all the refrigerant and add it again. [0005] Existing low-temperature boxes generally have problems such as complex structure, high energy consumption, large vi...

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Problems solved by technology

[0003] Simple cascade refrigeration requires at least two sets of refrigeration cycles to work together, with complex structure, poor reliability, and difficult maintenance

[0004] Mixed working fluid natural cascade refrigeration uses mixed working fluid, the control system is relatively complicated, and once the mixed working fluid leaks, the refrigerant composition will change, which will have a great impact on the refrigeration effect and cannot be supplemented. Drain all the refrigerant and add it again

[0005] Existing low-temperature boxes generally have problems such as complex structure, high energy consumption, large vibration, poor reliability, low operating efficiency, low stability control accuracy, and possible pollution caused by refrigerants.

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