AIR-CONDITIONING APPARATUS

摘要

An air-conditioning apparatus capable of storing a surplus of refrigerating machine oil and returning a necessary amount of the refrigerating machine oil to a compressor as required. In an air-conditioning apparatus, a controller determines the amount of refrigerating machine oil that is present in a compressor by measuring power of the compressor and controls opening and closing of a solenoid valve on the basis of the measurement results.

主权项

1. An air-conditioning apparatus comprising:
a compressor that compresses and discharges a refrigerant; a condenser that exchanges heat between a refrigerant that is discharged from the compressor and a heat medium; an expansion valve that depressurizes a refrigerant that has flowed out from the condenser; an evaporator that exchanges heat between a refrigerant that is depressurized by the expansion valve and a heat medium; an oil separator that is disposed on a discharge side of the compressor and that separates refrigerating machine oil from the refrigerant that is discharged by the compressor; an oil reservoir that is disposed on a downstream side of the oil separator and that stores refrigerating machine oil that is separated by the oil separator, a first connection pipe that connects a bottom portion of the oil reservoir and a suction side of the compressor; a second connection pipe that connects a portion of the oil reservoir that is more above than a portion thereof to which the first connection pipe is connected and the suction side of the compressor; a solenoid valve that is provided to the first connection pipe and that opens and closes the first connection pipe; and a controller that controls opening and closing of the solenoid valve on the basis of an amount of refrigerating machine oil that is present in the compressor.