Patent ID: 8512019

Claim:
A screw compression apparatus comprising: a screw compressor housing providing a rotor chamber; a plurality of rotors provided in said rotor chamber, each of said rotors being rotatably supported on a rotor shaft, wherein the rotors are provided in a male/female interlocking arrangement to compress a target gas in the rotor chamber by rotation of the rotors on the respective rotor shafts; a bearing space formed in the compressor housing adjacent to the rotor chamber; a bearing provided in said bearing space and rotatably supporting one of said rotor shafts; a shaft sealing member provided in the bearing space between the bearing and the rotor chamber; a lubricating fluid separating collector which separates rotor lubricating fluid discharged from the rotor chamber from the target gas discharged from the rotor chamber; rotor lubricating fluid feeding means which introduces the rotor lubricating fluid separated by the lubricating fluid separating collector into the rotor chamber; and a bearing lubricating system which supplies a bearing lubricating fluid to the bearing space, and returns bearing lubricating fluid discharged from the bearing space back into the bearing space, wherein the bearing lubricating system is fluidically isolated from the lubricating fluid separating collector and the rotor lubricating fluid feeding means.