| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner preventing the lowering of concentration of refrigerating machine oil by a refrigerant flooding state in a compressor.SOLUTION: An air conditioner is provided with an inside high pressure type compressor 10; a receiver 70 capable of collecting refrigerating machine oil 15; oil concentration detecting means 121 and 122. During the operation of the compressor, a detection value detected by the oil concentration detecting means become a set value or more, a part of the refrigerating machine oil in the compressor is collected in the receiver by oil level difference between the compressor and the receiver. When the compressor is started, if the detection value detected by the oil concentration detecting means is the set value or less, the refrigerating machine oil of high concentration collected in the receiver is supplied to the compressor by differential pressure between the compressor and the receiver. While the operation of the compressor is stopped, the receiver is insulated from a cycle. |
