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1故障现象一台FB561－60型医用低温箱，使用多年后，发现两台压缩机都能启动运转，但不制冷。高温级压缩机低压回气管结了很厚的霜，低温级压缩机外壳很烫手，排气管不热，压缩机壳内有“吱吱”气流声，箱内蒸发器流水声消失。2分析与检修这种低温箱实质上相当于两组单级制冷系
1 Fault phenomenon A FB561-60 medical cryostat, after many years of use, it was found that both compressors can be started but not cooled. The high-pressure compressor has a very thick frost on the low-pressure gas return tube. The compressor shell of the low-temperature compressor is very hot and the exhaust pipe is not hot. The compressor shell has “sudden” airflow noise and the sound of the evaporator water in the tank disappears. 2 Analysis and Maintenance This kind of cryogenic chamber is essentially equivalent to two single-stage refrigeration systems.