Refrigeration cycle apparatus

摘要

In a dehumidification-air heating mode, a refrigerant circuit is configured such that a refrigerant outlet side of an exterior heat exchanger communicates with a heating side refrigerant suction port of a heating side ejector as a refrigerant decompression means, and that a refrigerant inlet side of an interior evaporator communicates with an outlet side of a heating side diffuser of the heating side ejector. A refrigerant evaporation temperature in the exterior heat exchanger is set lower than that of the interior evaporator by a pressurizing effect of the heating side ejector. Thus, the amount of heat absorption by the refrigerant at the exterior heat exchanger is increased to improve the heating capacity of the air in an interior condenser.

主权项

1. A refrigeration cycle apparatus to be applied to an air conditioner, the refrigeration cycle apparatus comprising:
a compressor compressing and discharging a low-pressure refrigerant; a heating heat exchanger that heats air to be blown into a space to be air-conditioned, using a high-pressure refrigerant discharged from the compressor as a heat source; a branch portion that branches a flow of the refrigerant flowing out of the heating heat exchanger; a heating side ejector that draws a refrigerant from a heating side refrigerant suction port by a suction effect of an injection refrigerant injected from a heating side nozzle portion that decompresses one of the refrigerants branched by the branch portion, the heating side ejector including a heating side pressure-increasing portion that raises a pressure of a mixed refrigerant including the injection refrigerant and a suction refrigerant drawn from the heating side refrigerant suction port; an exterior heat exchanger that exchanges heat between a refrigerant on a downstream side of the heating side pressure-increasing portion and outside air to evaporate the refrigerant, and allows the refrigerant to flow out toward a side of the heating side refrigerant suction port; a cooling side decompressor decompressing the refrigerant; and a cooling heat exchanger that evaporates the refrigerant decompressed by the cooling side decompressor to cool the air before passing through the heating heat exchanger, wherein in a dehumidification-air heating mode in which the heating heat exchanger reheats the air cooled by the cooling heat exchanger, the other refrigerant branched by the branch portion flows into the cooling side decompressor, and the refrigerant on a downstream side of the heating side ejector and the refrigerant on a downstream side of the cooling side decompressor are drawn into the compressor.