Patent ID: 9657975
Date: 2017-05-23
CPC Classifications: F01M,F04B,F04C,F16N,F25B

Claim:
1. An oil balancing apparatus, comprising; at least three compressors connected in parallel, with at least two of said compressors being oil-rich compressors, and at least one of said compressors being an oil-starved compressor; and the oil balancing apparatus comprises a first oil balancing pipe and a second oil balancing pipe, the first oil balancing pipe directly connecting oil sumps of all the compressors, the second oil balancing pipe directly connecting oil sumps of said at least two oil-rich compressors and not an oil sump of said at least one oil-starved compressor, such that oil may always flow freely between the at least two oil-rich compressors to equalize pressure between said at least two oil-rich compressors, wherein each of the oil-rich compressors has a predetermined standard oil level, and ports at which the first oil balancing pipe and the second oil balancing pipe are respectively connected to the oil sumps of the oil-rich compressors are at a same height as the predetermined standard oil level in the oil sumps of the compressors.