Design and Cutting of Three-Lobe Helical Rotor in Roots Blower

摘要

For circular arced rotors in Roots blower, there are three different kinds of profile of the transverse section. The equations of the profiles of these three kinds of three-lobe circular arced rotor are derived in details in this article. The explicit expression of the radius of curvature of the profile and the maximum ratio of r_a/a are derived. The characteristics of these three different kinds of circular arced rotors are discussed and compared. The equations of the helicoids of the helical rotor and the axial section of the milling cutter are derived. The cutting parameters and interference problem during cutting are discussed deeply.