| 摘要 |
PROBLEM TO BE SOLVED: To balance a passing refrigerant quantity of a compressing mechanism and a passing refrigerant quantity of an expanding mechanism regardless of an operating state without reducing power capable of being recovered by the expanding mechanism. SOLUTION: This refrigerating device comprises a refrigerant circuit (20) formed by connecting the compressing mechanism (40), a heat source-side heat exchanger (21), the expanding mechanism (60) and a use-side heat exchanger (22) to implement a steam compression-type refrigerating cycle, and the expanding mechanism (60) and the compressing mechanism (40) are connected with each other. The expanding mechanism (60) comprises a first expander (61) for expanding a refrigerant and a second expander (62) for further expanding the refrigerant expanded by the first expander (61). In the refrigerant circuit (20), an expansion-side bypass passage (70) comprising a flow controllable expansion side-control valve (71) is connected in parallel with the first expander (61). A high-pressure refrigerant before flowing into the first expander (61) is partially introduced to the second expander (62) when the pressure of the high pressure refrigerant rises. COPYRIGHT: (C)2007,JPO&INPIT
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