Trapping-Free Rotors for High-Sealing Lobe Pumps

[+] Author and Article Information
Hung-Cheng Liu, Shih-Hsi Tong, Daniel C. H. Yang

Mechanical and Aerospace Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, CA 90095

J. Mech. Des 122(4), 536-542 (Jul 01, 1999) (7 pages) doi:10.1115/1.1311611 History: Received July 01, 1999
Copyright © 2000 by ASME
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Dickenson, T. C., 1995, Pumping Manual, Elsevier Science LTD.
Warring, R. H., 1984, Pumps: Selection, Systems and Applications, 2nd Ed., Gulf Publishing Company.
Cheremisiroff, N. P., and Cheremisiroff, P. N., 1992, Pumps and Pumping Operations, Prentice Hall, Englewood Cliffs, NJ.
Mimmi, G. C., and Pennacchi, P. E., 1998, “Computation of Pressure Loads in the Three-Lobe Supercharger,” MECH 5832, ASME Design Engineering Technical Conferences, Sep. 13–16, Atlanta, GA.
Fox, R. W., and McDonald, A. T., 1992, Introduction to Fluid Mechanics, John Wiley & Sons, New York.
Yang,  D. C. H., Tong,  S. H., and Lin,  J., 1999, “Deviation-Function Based Pitch Curve Modification for Conjugate Pair Design,” ASME J. Mech. Des., 121, No. 4, pp. 579–586.
Tong, S.-H., 1998, “New Conjugate Pair Design—Theory and Application,” dissertation UCLA, Department of Mechanical and Aerospace Engineering.


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(a) Mechanism of lobe pump, (b) Illustration of the slip (or leakage) through the clearance gap
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Rotor profile with better conformity (ρ: radius)
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Pitch pairs and generated pairs
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Generated rotor profile and design parameters
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(a) Designed rotor profile: (b) The corresponding lobe pump
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Values of e(0) and e′ (0)
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Different rotor positions of the designed pump
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(a) Rotor profiles according to different β values; (b) Enlarged graph showing different intersection angles to pitch circle
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e(0) values, e(45°)=r, i.e., β=1
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(a) Expressions of δt; (b) Expressions of δr
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The involute rotor profile and the designed rotor profiles



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