The Design and Analysis of the Fully Smooth Rotor Profile of Twin-Screw Vacuum Pump

Yongqi Li; Wang Xu; Yichao Sun; Yuefei Zheng

doi:10.54691/j6h86n51

Authors

Yongqi Li
Wang Xu
Yichao Sun
Yuefei Zheng

DOI:

https://doi.org/10.54691/j6h86n51

Keywords:

End Face Profile; Elliptical Arc; Concentric Circular Arc; Leakage Passage.

Abstract

To address the issues of discontinuous contact lines and sharp points on the tips of the gears in the cycloidal-involute rotor end profile of existing twin-screw vacuum pumps, a fully smooth rotor profile for twin-screw vacuum pumps is proposed. A concentric arc meshing model and a tip elliptical arc correction model are established, and the rotor profile equation is derived. Three-dimensional modeling is completed along with dynamic interference analysis. Furthermore, a comparative analysis of the rotor's geometric characteristics is conducted, focusing on aspects such as the leakage triangle and area utilization rate. The research results indicate that after the correction of the concentric arc meshing model, the area of the leakage triangle is reduced to 51.1% of that before correction, and the effective area utilization rate of the rotor end face is significantly improved.

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