Patent ID: 7062929

Claim:
An air-conditioner with a vapor-compression refrigerant cycle comprising: a compressor for sucking and compressing refrigerant and for variably controlling an amount of the refrigerant discharged from the compressor per unit of time; a radiator for radiating heat and cooling high-pressure refrigerant compressed by the compressor; an evaporator for cooling air blowing into a passenger compartment of a vehicle by evaporating the refrigerant; an ejector having a nozzle with an opening degree of a throttle for jetting the refrigerant at high speed by decompressing and expanding the high-pressure refrigerant at the nozzle so that low-pressure refrigerant is circulated by jetting the refrigerant and that suction pressure of the compressor is increased by converting expansion energy to pressure energy; and a separator for separating the refrigerant jetted from the ejector into gas refrigerant and liquid refrigerant so that the gas refrigerant is supplied to a suction side of the compressor and the liquid refrigerant is supplied to the evaporator, wherein the opening degree of the throttle of the nozzle in the ejector becomes larger so as to increase a cooling performance of the air-conditioner when the amount of the refrigerant discharged from the compressor is smaller than a maximum amount of the refrigerant discharged from the compressor.