| 摘要 |
An outdoor unit (11), comprising a compression mechanism (40) having a fixed displacement high-pressure dome type first compressor (41) and a variable displacement high-pressure dome type second compressor (42), wherein an oil separator (51) is installed at the delivery side of the compression mechanism (40), an oil return pipe (52) having an oil return solenoid valve (53) and returning the oil separated by the oil separator (51) to the compression mechanism (40) is connected between the oil separator (51) and the suction side of the compression mechanism (40), an oil equalizing pipe (54) having an oil equalizing solenoid valve (55) and, when the oil stored in the first compressor (41) increases to a specified level or higher, feeding excess oil to the suction side of a second compressor (42) is connected between the first compressor (41) and the suction side of the second compressor (42) and, when the first compressor (41) is driven together with the second compressor (42), the oil return solenoid valve (53) is synchronized with the oil equalizing solenoid valve (55) to perform an oil return control so as to switch between a communicated state and an interrupted state at specified intervals. |
