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Screw Rotor Profiles of Variable Lead Vacuum and Multiphase Machines and Their Calculation Models

[+] Author Affiliations
Nikola Stosic, Sham Rane, Ahmed Kovacevic, Ian K. Smith

City University of London, London, UK

Paper No. IMECE2016-66314, pp. V06AT08A047; 11 pages
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 6A: Energy
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5058-9
  • Copyright © 2016 by ASME


Twin screw machines are mechanically simple and reliable, having only two moving parts, while their manufacturing cost is low and, as a result of optimization of their rotor proportions and profiles, their efficiency is high. Consequently, they are now used widely both as multiphase and vacuum pumps.

This study gives the results of an investigation of how their performance is affected by changing the rotor lead, i.e. the axial step along the rotor wrap, from a constant value to a variable one. A number of different configurations have been considered and it is shown that, for machines with a large wrap angle, a variable lead results in greater displacement and improved efficiency.

Copyright © 2016 by ASME
Topics: Machinery , Vacuum , Screws , Rotors



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