Comparison Analysis and Verification on Spur and Helical Three-lobe Rotors with Novel Tooth Profile in Roots Blower

This paper proposes a novel three-lobe rotor tooth profile with the cross section of a combination of eccentric arcs and cycloidal curves for the Roots blower. Based on the geometric modelling of this new tooth profile, a helical tooth profile and a comparative study between the spur and the helical three lobes have been presented. The study reveals the advantages of the new helical tooth profile design which creates greater air flow and reduces the peak of the blower pressure. The tooth profile machining and testing are provided at the end of this paper.