Research on 35 K Cryogenic Refrigeration and Heat Transfer Integrated System

Cryogenic systems play an important role in space applications such as astronomical devices and deep space exploration.Lowering the refrigeration temperature can improve the measurement accuracy of the detection system,thereby obtaining a higher signal-to-noise ratio.An integrated system based on pulse tube cooler and cryogenic loop heat pipe is designed and manufactured.The integrated connection design is adopted and the installation interface is omitted.Two 35 K pulse tube coolers are used as heat sinks for two sets of 35 K neon cryogenic loop heat pipes.The heat pipe evaporators can be coupled to the same detector to realize the backup redundancy design of the system.A low-temperature heat-insulating cold shield is designed to reduce the parasitic heat leakage in the surrounding environment,and the 80 K pulse tube refrigerator is used as the cold shield heat sink.The loop heat pipe of the integrated system can realize the heat transmission of about 2 W,with a maximum transmission distance of 510 mm,which provides technical support for future deep space exploration technology.