| 摘要 |
PROBLEM TO BE SOLVED: To provide a supercritical vapor compression type refrigerating cycle capable of improving a coefficient of performance by applying an internal heat exchanger without weakening an effect of a gas injection. SOLUTION: A compressor 1, a high pressure radiator 2, a first expansion unit 3, a first gas-liquid separator 4, a second expansion unit 7, an evaporator 8 and a second gas-liquid separator 9 are sequentially connected. A main route for returning a gas phase refrigerator separated from the separator 9 to a suction port side of the compressor is constituted. In a gas injection cycle for returning the gas phase refrigerator of the first separator to an injection port of the compressor through gas injection piping, an internal heat exchanger for heat exchanging a high temperature refrigerant with a low temperature refrigerant is disposed at the downstream side of the first separator for not directly effecting an influence to the dryness of the refrigerant, thereby improving a coefficient of performance of the cycle.
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