| 摘要 |
PURPOSE:To prevent the supply of oil from being interrupted by a method wherein a closing valve, intercepting the returning of the oil upon stopping of a compressor, is provided in an oil returning pipe for an oil separator connected to the discharging side of the compressor, in the titled system utilized for a cooler or the like for vehicles such as a bus and the like in which a plurality of compressors are connected in parallel. CONSTITUTION:Suction pipes 34, 35 introduced out of an evaporator 32 are connected to the suction ports of two sets of small capacity compressors 30, 31 while discharging pipes 36, 37 of each compressors 30, 31, interposed with non- return valves 49, 50, are joined to a joining pipeline 38 to connect them to the oil separator 39. The oil separator 39 is connected to a condenser 41 through a discharged gas pipe 40 while the condenser 41 is connected to the evaporator 32 through an expansion valve 48. The oil returning pipe 42, provided in the oil separator 39, is connected to the compressors 30, 31 through branched oil pipes 43, 44 while respective branched oil pipes 43, 44 are provided with oil injection closing valves 45, 46 which are closed when the compressors are stopped. |
