| 摘要 |
PROBLEM TO BE SOLVED: To suppress pulsation of refrigerant which is caused at the time of cycle switching. SOLUTION: A high temperature-side refrigerant circuit 20 is connected to a low temperature-side refrigerant circuit 30 through a cascade heat exchanger 40. The low temperature-side circuit 30 comprises a low temperature-side condenser 32 connected in parallel to the cascade heat exchanger 40. The refrigerant of the low temperature-side refrigerant circuit 30 is condensed in a low-temperature side condenser 32 in single-stage refrigerating cycle, and condensed in the cascade heat exchanger 40 in secondary refrigerating cycle. A liquid storage 33 which absorbs the pulsation of refrigerant caused by pressure fluctuation in cycle switching is provided on the upstream of low temperature-side expansion valves 34a and 34b. COPYRIGHT: (C)2006,JPO&NCIPI
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