To improve performance of an air conditioner by returning a suitable amount of refrigerating machine oil from an oil separator to a compressor according to an operating condition of an air conditioner.
The air conditioner includes the operation frequency variable type compressor 1, a four-way valve 8, an outdoor unit A including an outdoor heat exchanger 2 and an outdoor expansion valve 3a, an indoor unit B including an indoor heat exchanger 4 and an indoor expansion valve 3b, and a refrigerant pipe connecting the outdoor unit and the indoor unit. Further, the air conditioner includes the oil separator 10 provided on a discharge side of the compressor, an oil-returning circuit 15 connecting an intake side pipe 6c of the compressor and the oil separator, an electronic expansion valve 3c provided for the oil-returning pipe, and a control means for controlling an opening degree of the electronic expansion valve of the oil-returning circuit according to the operation frequency of the compressor and pressure difference between the intake side and the discharge side of the compressor.
| JP4599764 | Scroll type fluid machine and refrigeration system |
| JP2008180447 | COOLANT CIRCUIT |
AJIKI NAOJI
MAEHARA HIROAKI
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