| 摘要 |
PROBLEM TO BE SOLVED: To provide a supercritical refrigerating cycle capable of combining improvement of cooling capacity by internal heat exchange and prevention of liquefaction of a refrigerant supplied to a compressor by controlling a refrigerant flow rate to an internal heat exchanger on the basis of a refrigerant temperature while reducing the number of components and costs, and improving reliability. SOLUTION: In a CO<SB>2</SB>refrigerating cycle constituted by successively annularly connecting the compressor 1, a gas cooler 2, an expansion valve 3, an evaporator 4 and an accumulator 5, and comprising the internal heat exchanger 6 exchanging heat between a high-pressure refrigerant from the gas cooler 2 and a low-pressure refrigerant from the accumulator 5, a bypass passage 7 bypassing at least a passage at one side of the internal heat exchanger 6, is disposed, and the bypass passage 7 is provided with a first flow rate adjustment valve 8 and a second flow rate adjustment valve 9 sensing the refrigerant temperature to perform valve motion for closing when the high-pressure refrigerant from the gas cooler 2 is cooled by the internal heat exchange, and opening when the low-pressure refrigerant from the accumulator 5 is cooled by the internal heat exchange. COPYRIGHT: (C)2009,JPO&INPIT
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