A Study on Synthesis Design and Optimization Analysis on Scroll Profiles for Scroll Vacuum Pump

Licun Wang*, 1, 2, 3, 4, Xudong Wang1, 2, Li Du1, Xianming Zhang1, Bin Chen1, Sinan H. Hussain2, 5
1 Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing, 400067, China
2 State Key Laboratory of Mechanic Transmission, Chongqing University, Chongqing 400030, China
3 State Key Laboratory of Tribology, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China
4 National Engineering Research Center of Fluid Machinery and Compressor, Xi’an Jiaotong University, Xi’an 710049, China
5 Mechanical Engineering Department, Mosul University, Mosul 31313, Iraq

© 2010 Wang et al

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the College of Mechanical Engineering, No. 19, Xuefu Ave., Nan’an Ditrict, Chongqing Technology and Business University, Chongqing 400067, China; Tel: +86-13983836979 (Mobile), +86-23-62768469(office); Fax: +86-23-62769374; E-mail:


The scroll profile plays a very important role in the design of a scroll vacuum pump in oil filter. Therefore, a geometric general form of the scrolls based on Whewell equation was developed in this study. The general planar curve form of the scrolls was specified using the Whewell equation, which consists of three segments and it is easy to analyze and optimize. The analysis reveals that the general model can contain most scrolls based on circle. A general design and multi-objective optimization process for the profile of scroll vacuum pumps was proposed. The design and optimization process was developed based on geometric and multi-objective considerations. The Nondominated Sorting Genetic Algorithm was applied to this multi-objective optimization question. The finite element method/FEM is the kernel of the approach. The scroll components work in a high pressure and high temperature environment, which results in the deformation of the scroll wall. The FEM and optimization can evaluate the deformation due to the cutting force and compensate accordingly.

Keywords: Scroll vacuum pump, oil filter, scroll profiles, integration design, optimizationanalysis.