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VACUUM ›› 2025, Vol. 62 ›› Issue (3): 42-46.doi: 10.13385/j.cnki.vacuum.2025.03.08

• Vacuum Acquisition System • Previous Articles     Next Articles

Study on Volume Utilization Rate of Rotor Profiles of Roots Vacuum Pumps

LI Zhengqing, LI Xiaojin, CHENG Yongjun, SUN Wenjun, YANG Jianbin, LIU Xiaowen, MA Fengying   

  1. Lanzhou Institute of Physics, Lanzhou 730000, China
  • Received:2024-08-26 Online:2025-05-25 Published:2025-05-23

Abstract: Volume utilization rate is one of the important contents of rotor profile for Roots vacuum pumps. In order to select reasonable parameters of rotor profile, the relationship between volume utilization rate and variable parameters of rotor profiles is analyzed, so that the as-designed rotor has the advantages of short length and small volume under the same geometric pumping speed. The results show that the volume utilization rate of the single variable rotor profile is a constant, and the volume utilization rate of two-variable and three-variable profiles increases with the ratio of top and pitch circle radii. When the ratio of top and pitch circle radii can take a larger value, the optimized cycloid and circular arc rotor profiles may be selected. If the value is small, the involute rotor profile is preferred. For the three-variable profile, the volume utilization rate of the top elliptical rotor profile is higher than that of the waist elliptical rotor profile, and the elliptic eccentricity also affects the volume utilization rate. Under the given pumping conditions, a larger rotor radius may be designed to reduce the length and volume of the rotor.

Key words: Roots vacuum pump, rotor profile, volume utilization rate, top circle radius, pitch circle radius

CLC Number:  TB752

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