Development of Helium Oil Free Screw Compressor

Development of an oil-free swing vane compressor with liquid refrigerant injection

“…Similarly, the design of the oil-free screw compressor for helium compression by Kitagawa et al [51] also uses timing-gears to maintain non-contact operation between the rotors. In addition, Kitagawa et al applied high rotational cylindrical roller bearings for radial support of the timing-gears because of its high accuracy of positioning to maintain an infinitesimal rotor-lobe clearance during operation.…”