| 摘要 |
PURPOSE:To prevent defective librication for parallel compressors in single running by providing a check valve in a uniform-pressure uniform-oil piping to return positively oil to one compressor. CONSTITUTION:When only a second compressor 2 is run, refrigerant gas and oil flow into a motor chamber 2c through an intake branch pipe 7 of the second comprssor 2 from an intake pipe 5, during which pressure in the motor chamber 2c is reduced. Since a check valve 4 is provided in an uniform-oil pipe 3, gas flow from a first compressor 1 to a compression element chamber 2d of the second compressor 2 is blocked, and pressure in the comression element chamber 2d is maintained at the same level as the motor chamber 2c by the action of an uniform-pressure differntial valve 2h to provide a constant oil level so that defective lubrication can be prevented in signal running. |
