REFRIGERATION DEVICE

摘要

A refrigeration device (20) has an intermediate-pressure heat exchanger (40) and a gas-liquid separator (51). In cooling operation, that portion of refrigerant which is condensed in an outdoor heat exchanger (36) flows into injection piping (43). The pressure of the refrigerant flowed into the injection piping (43) is reduced to an intermediate pressure when the refrigerant passes an injection expansion valve (44), and then the refrigerant is supplied to an intermediate pressure port (32) of a compressor (31) after evaporating at the intermediate- pressure heat exchanger (40). In heating operation, the pressure of the refrigerant condensed at an indoor heat exchanger (71) is reduced to an intermediate pressure when the refrigerant passes an indoor expansion valve (72), and then the refrigerant flows into the gas-liquid separator (51). The intermediate-pressure gas refrigerant in the gas-liquid separator (51) is supplied to the intermediate pressure port (32) of the compressor (31).