Oil injected screw compressor component, has second groove provided in rotor shaft to improve rotor shaft bearing lubrication

摘要

Each rotor (10B) has at least one second groove (21) on the outlet side of the rotor shaft between the rotor chamber (9) and a first groove (19). The second groove is connected via at least one channel (22) to a location in the rotor chamber where the pressure is lower than the oil injection pressure during normal compressor operation. The component (1) comprises a casing (8) containing a rotor chamber with an inlet (12), an outlet (13) and two rotors, each rotor comprising a body with shafts on opposite sides mounted in the casing via at least one bearing (17). An oil collection groove is provided in the rotor shaft on the outlet side, between the rotor body and bearing. The groove is connected via at least one channel (20) with an oil supply system for injecting oil into the rotor chamber.