[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5757/ASCT.2015.24.1.9

Analysis of Pumping Characteristics of a Multistage Roots Pump

In, S.R. (Korea Atomic Energy Research Institute)
Kang, S.P. (Woosung Vacuum Co. Ltd.)

Publication Information

Applied Science and Convergence Technology / v.24, no.1, 2015 , pp. 9-15 More about this Journal

Abstract

The practical pumping speed of a dry pump is considerably lower than the intrinsic speed because of back-streaming through finite gaps of the rotor assembly. The maximum compression ratio and the ultimate pressure of the pump are also directly influenced by the back-streaming rate. Therefore, information on the gap conductance, which determines the back-streaming characteristics of the rotor assembly, is the most important key for estimating the pumping performance of a dry pump. In this paper, the feasibility of calculating analytically the pumping performance of a multi-stage Roots pump, one of the most popular types of dry pumps, by quantifying the gap conductance in a rational way, is discussed.

Keywords

Roots pump; Gap conductance; Back-streaming; Multi-stage;

Citations & Related Records

Reference

1	B. N. Cole, J. F. Groves, and B. W. Imrie, Proc. Instrn. Mech. Engrs. 184, Pt3R, 114 (1969-70)
2	L. C. Valdes, R. Theis, B. Barthod, and B. Desmet, Vacuum 48, 839 (1997). DOI ScienceOn
3	A. Burmistrov, L. Bolyaev, P. Ossipov, M. Fomina, and R. Khannanov, Vacuum 62, 331 (2001). DOI ScienceOn
4	A. M. Joshi, D. I. Blekhman, J. D. Felske, J. A. Lori, and J. C. Mollendeof, Inter. J. of Rotating Machinery, Article ID79084, 1 (2006).
5	S. H. Bae, S. R. In, K. H. Chung, Y. H. Shin, Y. P. Lee, Vacuum Technology (New Books on Science and Technology 18, The Korea Economic Daily, Seoul, 2004), pp 87.
6	J. M. Lafferty Ed., Foundations of Vacuum Science and Technology (John Wiley & Sons, N.Y., 1999) pp 129.