초록 ▼

A refrigeration cycle is switched from a refrigeration cycle circuit to a hot gas heater circuit to make the hot gas discharged from a compressor flow into an evaporator and heat the vehicle passenger compartment, at which time, when a suction pressure (Ps) of the compressor becomes a low pressure b

A refrigeration cycle is switched from a refrigeration cycle circuit to a hot gas heater circuit to make the hot gas discharged from a compressor flow into an evaporator and heat the vehicle passenger compartment, at which time, when a suction pressure (Ps) of the compressor becomes a low pressure below a first predetermined pressure, the discharge volume (Vc) of the compressor is made larger to ensure a sufficient auxiliary heating performance. Further, when the hot gas is made to flow into the evaporator to heat the vehicle passenger compartment, if the suction pressure (Ps) of the compressor becomes a higher pressure over a second predetermined pressure, the discharge volume (Vc) of the compressor is made smaller to protect the refrigeration cycle parts and lighten the ON, OFF shock.

대표청구항 ▼

[ What is claimed is:] [1.] A refrigeration cycle apparatus comprising:(a) a refrigerant compressor driven in rotation by an internal combustion engine so as to compress the refrigerant,(b) a refrigerant condenser arranged to perform heat exchange with a cooling medium on the inflowing refrigerant t

[ What is claimed is:] [1.] A refrigeration cycle apparatus comprising:(a) a refrigerant compressor driven in rotation by an internal combustion engine so as to compress the refrigerant,(b) a refrigerant condenser arranged to perform heat exchange with a cooling medium on the inflowing refrigerant to cause it to condense and liquefy,(c) a refrigerant evaporator arranged to perform heat exchange with air on the inflowing refrigerant to cause it to evaporate and vaporize,(d) a first refrigerant circulation circuit arranged to allow the refrigerant discharged by said refrigerant compressor to pass through said refrigerant condenser, circulate to said refrigerant evaporator, and return to said refrigerant compressor,(e) a second refrigerant circulation circuit arranged to allow the refrigerant discharged by said refrigerant compressor to bypass said refrigerant condenser, to circulate to said refrigerant evaporator, and return to said refrigerant compressor,(f) a circulation circuit switch constructed and arranged to switch between said first refrigeration circulation circuit and said second refrigeration circulation circuit, and(g) a variable discharge volume controller constructed and arranged to reduce the discharge from said refrigeration cycle apparatus when the suction pressure into said refrigeration cycle apparatus becomes lower than a predetermined value when switched to said first refrigerant circulation circuit and reducing the discharge from the refrigeration cycle apparatus when an suction pressure into said refrigeration cycle apparatus when an suction pressure into said refrigeration cycle apparatus becomes higher than a predetermined value when switched to said second refrigerant circulation circuit.