罗茨真空机组预抽阶段的抽气特性比较研究

doi:10.13385/j.cnki.vacuum.2022.01.01

Abstract

Abstract: In view of the three working modes of the Roots vacuum pump unit in the start-up process, namely bypass mode, straight through mode and frequency conversion mode, the simplified calculation models are established respectively. The effective pumping speed calculation formula of the Roots vacuum pump unit are derived before the Roots pump enters the normal steady-state operation, as well as the calculation method of the pumping time of the pumped container. Through an example, the pressure time curves of three different start-up modes are obtained. It is proved that the pumping time of the container decreases in turn under the working modes of frequency conversion, bypass and straight through, and the frequency conversion start-up mode can save 46.58% of the pumping time compared with that of the straight through start-up mode.

Key words: Roots vacuum pump unit, start-up process, pumping speed calculation, frequency conversion

CLC Number:

TB751

ZHANG Shi-wei, GAO Lei-ming, LI Run-da, MAN Yong-kui, DU Yuan-peng, WANG Bo, XU Zu-jin. Comparative Study on Pumping Characteristics of the Roots Vacuum Unit in Start-up Process[J].VACUUM, 2022, 59(1): 1-6.

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Comparative Study on Pumping Characteristics of the Roots Vacuum Unit in Start-up Process

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