Patent ID: 7415838

Claim:
A second-refrigerant pump driving type air conditioner, comprising: an indoor unit having an indoor heat exchanger that heat-exchanges a refrigerant containing no oil with indoor air; a first circulator including a compressor that compresses and discharges a refrigerant containing oil, a first outdoor heat exchanger connected to a first side of the compressor that heat-exchanges the refrigerant discharged from the compressor with the refrigerant containing no oil, a second outdoor heat exchanger connected to a second side of the compressor that heat-exchanges the refrigerant discharged from the compressor with outdoor air, and an outdoor expander connected to the first outdoor heat exchanger and the second outdoor heat exchanger to depressurize and expand the refrigerant discharged from the compressor; and a second circulator including an intermediate heat exchanger connected to a first side of the indoor heat exchanger to heat-exchange the refrigerant containing no oil with the refrigerant inside the first outdoor heat exchanger, a receiver connected to a second side of the indoor heat exchanger that receives the refrigerant discharged from the indoor heat exchanger, and a pump that pumps the refrigerant received by the receiver so that it is circulated.