초록 ▼

In a vehicle air conditioner, during a cooling mode of a refrigerant cycle, refrigerant discharged from a compressor passes through a condenser and flows into a heat exchanger used as an evaporator after being press-reduced in a first press-reducing unit. On the other hand, during a heating mode of

In a vehicle air conditioner, during a cooling mode of a refrigerant cycle, refrigerant discharged from a compressor passes through a condenser and flows into a heat exchanger used as an evaporator after being press-reduced in a first press-reducing unit. On the other hand, during a heating mode of the refrigerant cycle, refrigerant discharged from the compressor is directly introduced into the heat exchanger used as a radiator after being press-reduced in a second press-reducing unit, while bypassing the condenser and the first press-reducing unit. During the heating mode or during the cooling mode when outside air temperature is low, a double layer flow mode is set so that outside air flows toward a defroster opening through a first air passage and inside air flows toward a foot opening through a second air passage partitioned from the first air passage. Thus, it can prevent a windshield from being fogged due to vaporization of condensed water on the heater exchanger during the heating mode.

대표청구항 ▼

1. An air conditioner for a vehicle having an engine and a passenger compartment, said air conditioner comprising:an air conditioning case for defining an air passage through which air is blown into the passenger compartment, said air conditioning case having a first opening through which air is blo

1. An air conditioner for a vehicle having an engine and a passenger compartment, said air conditioner comprising:an air conditioning case for defining an air passage through which air is blown into the passenger compartment, said air conditioning case having a first opening through which air is blown toward a windshield and a second opening through which air is blown toward a lower side of the passenger compartment; a partition member for partitioning said air passage into a first air passage through which outside air outside the passenger compartment flows into said first opening and a second air passage through which inside air inside the passenger compartment flows into said second opening, during a double layer flow mode; a compressor for compressing and discharging refrigerant; a condenser for condensing refrigerant discharged from said compressor during a cooling mode; a first press-reducing unit for decompressing refrigerant from said condenser; a heat exchanger disposed in said air conditioning case, for cooling air passing therethrough and for evaporating refrigerant from said first press-reducing unit during said cooling mode; a refrigerant duct for defining a hot-gas bypass passage through which refrigerant discharged from said compressor is directly introduced into said heat exchanger while bypassing said condenser and said first press-reducing unit during a heating mode; a second press-reducing unit, disposed in said hot-gas bypass passage, for decompressing refrigerant discharged from said compressor; a valve unit for switching a communication between a refrigerant discharged side of said compressor and a refrigerant inlet side of said compressor and a refrigerant inlet side of said condenser, and a communication between the refrigerant discharge side of said compressor and a refrigerant inlet side of said hot-gas bypass passage; and a control unit for setting said double layer flow mode during said heat mode; wherein: in said cooling mode, said control unit sets said double layer flow mode only when temperature of outside air is lower than a predetermined temperature.