Patent ID: 8109111

Claim:
A refrigerating apparatus comprising a refrigerant circuit including a first compressor, a second compressor, and an intermediate-pressure refrigerant gas-liquid separator for performing a refrigeration cycle, said gas-liquid separator separating flowed-in refrigerant into a gas refrigerant and a liquid refrigerant, wherein the refrigerant circuit is switched from/to a heating cycle to/from a defrosting cycle, refrigerant being subjected to two-stage compression/two-stage expansion in the heating cycle in which refrigerant discharged from the first compressor is compressed in the second compressor, condensed refrigerant flows into the gas-liquid separator, and gas refrigerant in the gas-liquid separator is sucked into the second compressor, and in the defrosting cycle, part of the refrigerant discharged from the first compressor and then condensed flowing into the gas-liquid separator while both of the first compressor and the second compressor are operated, and the refrigerant circuit includes an injection pipe for injecting part of refrigerant discharged from the second compressor into a suction side of the second compressor in the defrosting cycle so as to merge the refrigerant with refrigerant from the gas-liquid separator.