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

作　　者：刘建停 李杨 李晓配 李海强 LIU Jianting;LI Yang;LI Xiaopei;LI Haiqiang(Jiangsu XCMG Construction Machinery Research Institute Co.,Ltd.,Xuzhou 221001,China;State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery,Xuzhou 221001,China)

机构地区：[1]江苏徐工工程机械研究院有限公司,江苏徐州221001 [2]高端工程机械智能制造全国重点实验室,江苏徐州221001

出　　处：《流体机械》2025年第1期25-32,40,共9页Fluid Machinery

基　　金：国家重点研发计划项目(2021YFC3090404)。

摘　　要：针对罗茨真空泵因排气脉动引起的气体动力性噪声问题,设计等深矩形、渐扩矩形、等深弧形、渐扩弧形4种不同结构的回流槽模型,运用RNG k-ε湍流模型和动网格技术分析回流槽结构对排气压力、流量及内部流场的影响,并通过试验对模型进行验证。研究结果表明,回流槽结构可提高泵腔内基元容积的压力,有效抑制出口处高压气体返流,改善排气侧压力和流量波动,但同时会引起进口流量减小;当入口压力为30~76 kPa时,与其他3种回流槽相比,等深矩形回流槽的排气压力和流量的波动幅度最小,分别为1.31~6.97 kPa和0.39~1.48 m^(3)/s。研究结果可为罗茨真空泵降噪的结构设计优化提供理论依据。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-εturbulence 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 m^(3)/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 

分 类 号：TH36[机械工程—机械制造及自动化]