| 摘要 |
An object of the present invention is to make it possible to impart an adequate degree of subcooling to the refrigerant that has passed through the first expansion mechanism, and to maintain the proper degree of superheating of the refrigerant sucked into the compressor in a refrigerant circuit that is provided with a two-stage expansion mechanism. The refrigeration device (1) of the present invention is provided with a compression mechanism (11), a radiator (14), a first expansion mechanism (16), a second expansion mechanism (20), an evaporator (31), a first internal heat exchanger (15), a branch pipe (4), a third expansion mechanism (19), and a second internal heat exchanger (18). The first internal heat exchanger causes heat to be exchanged between refrigerant that flows from the exit side of the radiator to the inflow side of the first expansion mechanism, and refrigerant that flows from the exit side of the evaporator to the refrigerant inflow side of the compression mechanism. The branch pipe branches from a third refrigerant pipe for connecting the exit side of the radiator and the refrigerant inflow side of the second expansion mechanism, and merges with the second refrigerant pipe. A third expansion mechanism is provided to the branch pipe. The second internal heat exchanger causes heat to be exchanged between refrigerant that flows out from the first expansion mechanism, and refrigerant that flows out from the third expansion mechanism. |
