PROFILES OF SCREW-TYPE ROTORS FOR ROTARY MACHINES CONVEYING A GASEOUS FLUID

摘要

The profiles of screw-type rotors for rotary machines conveying a gaseous fluid involve at least for the teeth (13) of the male rotor (11) an apex (SM) characterized in that it is offset by an angle ( gamma M) in the rotational direction (f1), by a chamfer (13a) making an angle ( alpha M) open in the rotational direction and defined between, on the one hand, a tangent (TM) to the apex (SM), perpendicular to a straight line (DM) joining said apex to the rotational center (CM) of the male rotor (11) and, on the other hand, a straight line (dM) tangent to the apex (SM) and perpendicular to a straight line (D2M) joining said apex to the instantaneous rotational center (CI). Application to air compressors.