OIL EQUALIZING SYSTEM OF PLURAL COMPRESSORS

PROBLEM TO BE SOLVED: To solve the problem that in the case of two low-pressure shell compressors different in displacement, or in the case where one compressor is a variable displacement compressor, the pressure in the shell of the high displacement compressor becomes low, and the pressure in the shell of the low displacement compressor becomes high, so that refrigerator oil moves from the low displacement compressor to the high displacement compressor to decrease the oil quantity of the low displacement compressor. SOLUTION: The vicinity of the standard oil level of the shell of the low displacement compressor 1 and a suction pipe 3 of the high displacement compressor 2 are communicated with each other, oil separated by oil separators 6a, 6b is stored in a storage tank 7. From the bottom of the storage tank 7, one is communicated with a suction pipe 8 of the low displacement compressor, and the other is communicated with the suction pipe 3 of the high displacement compressor to control the oil quantity in the shells of the respective compressors 1, 2 to a proper quantity.