PURPOSE: To prevent each of compressors from being damaged due to a lack of lubrication by a method wherein when all of or a part of a plurality of compressors is operated, lowering of a the level of lubricant oil within the housing of each of the compressors is prevented.
CONSTITUTION: An oil reserve tank 31 is concentrically arranged with an accumulator 30. A plurality of low pressure housing closed type compressors 11 to 15 having the same specification are arranged concentrically around the oil reserve tank 31. Outlet pipes 30a to 30e of the accumulator 30 and housings of a plurality of compressors 11 to 15 are connected through respective suction pipes 38 to 42 having the same size and same shape to each other. The oil reserve tank 31 and the housings of a plurality of compressors 11 to 15 are connected to each other through respective uniform oil pipes 43 to 47 having the same size and same shape.
KITAGAWA KATSUTOSHI
SASAKURA MASAHIKO
