| 摘要 |
PROBLEM TO BE SOLVED: To suppress abnormal rising of a high pressure side pressure of a refrigerating cycle in its starting, even when the refrigerating cycle is provided with a fixed displacement type compressor and a supercritical fluid such as carbon dioxide is used as coolant. SOLUTION: The refrigerating cycle 1 has a subordinate passage 9 different from a main passage 7 comprised by serially joining the compressor 2, a heat radiator 3, an expansion device 4, an evaporator 5, and an accumulator 6 in sequence. In the subordinate passage 9, its upstream end is connected to a high pressure side 7A of the main passage 7 in an upstream side of the expansion device 4, and its downstream end is connected to a low pressure side 7B of the main passage 7 between the evaporator 5 and the accumulator 6. A relief valve 10 is positioned on the subordinate passage 9. The coolant passing through the relief valve 10 bypasses not only a pressure reduction regulating valve 8 of the expansion device 4, but also the evaporator 5. COPYRIGHT: (C)2008,JPO&INPIT
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