流体机械2025，Vol.53Issue(1)：25-32,40,9.DOI:10.3969/j.issn.1005-0329.2025.01.004
内设回流槽的罗茨真空泵流动特性研究
The investigation of flow characteristics in Roots vacuum pump with internal return cavity
摘要
Abstract
In order to solve gas dynamic noise of Roots vacuum pump due to gas pulsation,return cavity models of four different structures,such as constant rectangular,expanding rectangular,constant depth arc and expanding arc cavities,were designed.The effects of return cavity structure on exhaust pressure,flow rate and internal flow field were analyzed by using the RNG k-ε turbulence model and dynamic mesh method,and were verified by experiment.The research results show that the return cavity can increase the pressure of primitives volume in the pump chamber,which effectively suppresses high-pressure gas backflow and improve pressure and flow fluctuation at the outlet.Meanwhile,it can cause lower volumetric flow at inlet.When the inlet pressure is 30～76 kPa,compared with other three return cavities,the fluctuation amplitude of exhaust pressure and flow rate are the lowest at the outlet of constant depth rectangular return cavity(1.31～6.97 kPa and 0.39～1.48 m3/s,respectively).The research results can provide a theoretical basis for noise reduction and structural optimization of the Roots vacuum pump.关键词
罗茨真空泵/回流槽/压力/流量/波动幅度Key words
Roots vacuum pump/return cavity/pressure/flow rate/fluctuation amplitude分类
机械制造引用本文复制引用
刘建停,李杨,李晓配,李海强..内设回流槽的罗茨真空泵流动特性研究[J].流体机械,2025,53(1):25-32,40,9.基金项目
国家重点研发计划项目(2021YFC3090404) （2021YFC3090404）
