| 摘要 |
PROBLEM TO BE SOLVED: To inhibit the excessive compression loss and reverse flow loss of a first compression mechanism comprising a specific compression ratio type fluid machine in a refrigeration device provided with a compressor including a second compression mechanism and the first compression mechanism comprising a displacement type fluid machine. SOLUTION: The specific compression ratio type first compression mechanism (41) is used as a low stage side compression mechanism in a refrigerant circuit (11). An injection passage (26) for injecting refrigerant is provided between the first compression mechanism (41) and the second compression mechanism (42) in the refrigerant circuit (11). Discharge volume of the first compression mechanism (41) and suction volume of the second compression mechanism (42) are set to keep volume of refrigerant discharged from the first compression mechanism (41) during one rotation of a drive shaft (50) smaller than the volume of refrigerant sucked to the second compression mechanism (42) during one rotation of the drive shaft (50). COPYRIGHT: (C)2010,JPO&INPIT |
