Title: Optimal compensation approach of roots vacuum pump rotor considering pumping performance and dimensional accuracy

Authors: Can Yuan; Sitong Xiang; Cheng Wu; Xin Pan; Jianguo Yang

Addresses: School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, 315211, China ' School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, 315211, China ' School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, 315211, China ' Zhejiang Qiantang Robot and Intelligent Equipment Research Co., Ltd., Hangzhou, 310018, China ' School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

Abstract: Roots vacuum pumps are vital in scientific and industrial applications. Traditional performance optimisation focuses on rotor profile design but neglects machining errors, limiting real-world effectiveness. This paper proposes a rotor compensation optimisation method considering both pumping performance and dimensional accuracy. Firstly, a nonlinear mapping model of rotor radial clearance and pumping performance is established. Then, the radial clearance of the traditional mirror compensation (MC) surface is optimised using a genetic algorithm to obtain the optimised clearance and compensation surface. Experimental results show a 91.83% reduction in average dimensional deviation, a 4.23% increase in flow rate, and a 7.01% decrease in exhaust temperature. Compared to MC, the optimised method improves dimensional error compensation by 30.23%, flow rate by 1.78%, and lowers exhaust temperature by 3.46%. This method significantly enhances rotor accuracy and performance.

Keywords: roots vacuum pump; pumping performance; dimensional accuracy; rotor clearance; optimal compensation.

DOI: 10.1504/IJMMS.2025.153444

International Journal of Mechatronics and Manufacturing Systems, 2025 Vol.18 No.3, pp.201 - 220

Received: 29 Jul 2025
Accepted: 19 Oct 2025
Published online: 08 May 2026 *

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