| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerating system capable of preventing impairing of cooling performance. SOLUTION: In this refrigerating system 2 in which a CO<SB>2</SB>refrigerant is circulated in a circulation passage, a compressor 18, a gas cooler 20, an expansion valve 22 and an evaporator 26 are successively disposed in the circulation passage when observed from the refrigerant flowing direction, an oil separator 24 is disposed between the expansion valve and the evaporator for separating the oil for the compressor from the refrigerant, and further an oil returning passage 16 is formed for connecting the oil separator and the compressor in a state of bypassing the evaporator, and returning the separated oil from the oil separator to the compressor. COPYRIGHT: (C)2007,JPO&INPIT
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