| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigeration system that can increase the durability of a compressor using a CO<SB>2</SB>refrigerant. SOLUTION: A refrigeration circuit 6 in which a CO<SB>2</SB>refrigerant including lubricating oil circulates comprises at least the compressor 20, a gas cooler 22, an expansion valve 24 and an evaporator 26 interposed in the circulation path in sequence in the refrigerant flow direction; and refrigerant outflow prevention means 28 and 30 for preventing movements of the CO<SB>2</SB>refrigerant from the compressor to the gas cooler and to the evaporator, respectively, while the compressor is stopped, between the compressor and the gas cooler and between the evaporator and the compressor. COPYRIGHT: (C)2007,JPO&INPIT
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