Patent ID: 7674099

Claim:
An oil lubricated compressor operating horizontally wherein oil flows into a compression chamber inlet by gravity, comprising: a first oil sump at the pressure of a return gas, wherein said return gas is Helium; a first return oil fraction impinging on a first end of a drive shaft and flowing to a compression chamber internal to the compressor; a motor which turns the drive shaft located between said first end of said drive shaft and a second end; said compression chamber, driven by the second end of said drive shaft; a second oil fraction flowing into said first oil sump located in a compressor shell between the motor and the compression chamber inlet, said second oil fraction flowing into the compression chamber with said return gas; and an oil bypass line external to the compressor shell, wherein the oil bypass line returns said second oil fraction to the first oil sump at the pressure of said return gas, and said second oil fraction is greater than said first return oil fraction.