Air conditioning apparatus.

摘要

An air conditioning apparatus comprises a switching valve (2) for switching the flowing direction of a refrigerant discharged from a compressor (1) to carry out either cooling operation, heating operation or defrosting operation; an outdoor heat exchanger (3) for receiving the refrigerant supplied by the compressor (1) through the switching valve (2) to make the refrigerant heat exchange with air to be heat exchanged; an indoor heat exchanger (7) for making the refrigerant heat exchange with a fluid to be heat exchagned; an oil separator (10) which is arranged in a discharging side refrigerant pipe connecting the switching valve (2) and the discharge port of the compressor (1) to separate the refrigerant and a refrigerating machine oil which are discharged form the compressor (1); a first and second accumulators (9, 13) which are connected in series in an intake side refrigerant pipe connecting the switching valve (2) and the intake port of the compressor (1); a first bypass passage (11) for connecting the oil separator (10) and the second accumulator (13) through a solenoid valve (12); and a second bypass passage (14) for connecting the oil separator (10) and the intake port of the compressor (1) through a metering device (15). As a result, the refrigerating machine oil is returned to the compressor (1) through the first bypass passage (11) or the first and second bypass passages (11, 14) to prevent the compressor (1) from failing due to shortage of the refrigerating machine oil.