FREEZING APPARATUS

摘要

In a refrigerant circuit (20), a circuit (110) in a refrigerating chamber and a freezing circuit (30) are connected in parallel to an outdoor circuit (40), and in the freezing circuit (30), a circuit (130) in a freezing chamber and a booster circuit (140) are connected in series. The booster circuit (140) has a booster compressor (141) and three-way switching mechanisms (142, 160). During cooling operation of a freezing heat exchanger (131), a first operation is performed by the three-way switching mechanisms (142, 160), where, in the first operation, a refrigerant evaporated at the freezing heat exchanger (131) is compressed by the booster compressor (141) and sucked to a variable displacement compressor (41). During defrosting of the freezing heat exchanger (131), a second operation is performed by the three-way switching mechanisms (142, 160), where, in the second operation, the refrigerant evaporated at a refrigerating heat exchanger (111) is compressed by the booster compressor (141), supplied to the freezing heat exchanger (131), and returned to the refrigerating heat exchanger (111).