초록 ▼

Heat exchange is performed between a discharge side refrigerant and a suction side refrigerant also at the time of a heating operation. By this, a liquid phase refrigerant containing lubricating oil in the suction side refrigerant is heated by the discharge side refrigerant, and the liquid phase ref

Heat exchange is performed between a discharge side refrigerant and a suction side refrigerant also at the time of a heating operation. By this, a liquid phase refrigerant containing lubricating oil in the suction side refrigerant is heated by the discharge side refrigerant, and the liquid phase refrigerant is vaporized also at the time of the heating operation, so that the amount of the liquid phase refrigerant sucked into a compressor is decreased. Accordingly, the increase of compression work of the compressor is prevented, and an opening area of an oil return hole can be expanded to such a degree that an optimum amount of lubricating oil is attained at the time of the heating operation.

대표청구항 ▼

Heat exchange is performed between a discharge side refrigerant and a suction side refrigerant also at the time of a heating operation. By this, a liquid phase refrigerant containing lubricating oil in the suction side refrigerant is heated by the discharge side refrigerant, and the liquid phase ref

Heat exchange is performed between a discharge side refrigerant and a suction side refrigerant also at the time of a heating operation. By this, a liquid phase refrigerant containing lubricating oil in the suction side refrigerant is heated by the discharge side refrigerant, and the liquid phase refrigerant is vaporized also at the time of the heating operation, so that the amount of the liquid phase refrigerant sucked into a compressor is decreased. Accordingly, the increase of compression work of the compressor is prevented, and an opening area of an oil return hole can be expanded to such a degree that an optimum amount of lubricating oil is attained at the time of the heating operation. 054697, 19771000, Reed et al., 428/040; US-4091925, 19780500, Griffo et al., 206/423; US-4113100, 19780900, Soja et al., 206/602; US-4118890, 19781000, Shore, 047/028; US-4149339, 19790400, Hall et al., 047/067; US-4189868, 19800200, Tymchuck et al., 047/084; US-4216620, 19800800, Weder et al., 047/072; US-4248347, 19810200, Trimbee, 206/423; US-D259333, 19810500, Charbonneau, D09/306; US-4265049, 19810500, Gorewitz, 047/026; US-4280314, 19810700, Stuck, 053/241; US-4297811, 19811100, Weder, 047/072; US-4333267, 19820600, Witte, 047/084; US-4347686, 19820900, Wood, 047/073; US-4380564, 19830400, Cancio et al., 428/167; US-4400910, 19830800, Koudstall et al., 047/084; US-4413623, 19831100, Pieniak, 156/160; US-4413725, 19831100, Bruno et al., 206/045.33; US-D279279, 19850600, Wagner, D11/143; US-4546875, 19851000, Zweber, 206/000.82; US-4621733, 19861100, Harris, 206/423; US-4640079, 19870200, Stuck, 053/390; US-4717262, 19880100, Roen et al., 383/120; US-4733521, 19880300, Weder et al., 053/580; US-4765464, 19880800, Ristvedt, 206/000.82; US-4771573, 19880900, Stengel, 047/067; US-4773182, 19880900, Weder et al., 047/072; US-4801014, 19890100, Meadows, 206/423; US-4810109, 19890300, Castel, 383/105; US-4835834, 19890600, Weder, 029/525; US-D301991, 19890700, Van Sant, D11/149; US-4941572, 19900700, Harris, 206/423; US-4946290, 19900800, M