To enhance efficiency of operation, in a refrigerating device capable of switching between a cooling operation and a heating operation.
An air conditioner 10 has a four-stage compressor 20, a fourth heat exchanger 44, an indoor heat exchanger 12a, an expanding mechanism 70, a bridge circuit 55, an inside heat exchanger 62, an injection piping 61a, and an economizer heat exchanger 61. The fourth heat exchanger 44 functions as an heat radiator during cooling operation and functions as an evaporator during worming operation. The indoor heat exchanger 12a functions as an evaporator during cooling operation and functions as a heat radiator during warming operation. The indoor heat exchanger 62 exchanges heat between refrigerant supplied from the indoor heat exchanger 12a to the four-stage compressor 20 and refrigerant supplied from the fourth heat exchanger 44 to the expanding mechanic 70. The economizer heat exchanger 61 exchanges heat between refrigerant supplied from the heat radiator to the expansion mechanism 70 and refrigerant in a middle pressure flowing an injection piping 61a. The economizer heat exchanger 61 and the inside heat exchanger 62 are arranged in the first bridge piping 56a where refrigerant does not flow when warming the bridge circuit 55.
KOSHO KAZUHIRO
IWATA YASUHIRO
YO KUNITADA
