To detect generation of surplus oil only by simple temperature detection, preventing flowing-out of oil from an oil separator, and ensuring reliability of a compressor.
The compressor 11, the oil separator 12, a condenser 13, a pressure reducing means 14 and an evaporator 15 are annularly connected, these refrigeration cycle components are connected by refrigerant piping 16, further the oil separator 12 has a first opening/closing valve 19, an oil storage container 20, a second opening/closing valve 21 and a second capillary tube 22 in parallel with a first capillary tube 17, and an outlet of the second capillary tube 22 is joined to a connection pipe 18. The refrigerant piping 16 is provided with a first temperature sensor 23, and a second temperature sensor 23 is disposed on a connection pipe 18 between an outlet of the first capillary tube 17 and a joining section of the second capillary tube 22. Further, a first opening/closing valve control means 25 is disposed to control opening/closing of the first opening/closing valve 19 and the second opening/closing valve 21 according to the temperatures detected by the first temperature sensor 23 and the second temperature sensor 24.
| JP2008209019A | 2008-09-11 | |||
| JPH05264110A | 1993-10-12 | |||
| JP2007147208A | 2007-06-14 | |||
| JPS60245967A | 1985-12-05 | |||
| JPS62130370U | 1987-08-18 |
Daisuke Nagano
Kentaro Fujii
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