泵用顶突抛物线转子的高能组合型线构造方法  

Construction of Parabolic Rotor Profile with Rostellum Geometry for Roots Pump:A Simulation Study

作　　者：李玉龙 孙付春 冉光泽 Li Yulong;Sun Fucun;Ran Guangze(School of Mechanical and Electrical Engineering ,Suqian College ,Suqian 223800 .China;College of Industrial Engineering, Chengdu University, Chengdu 610106 ,China)

机构地区：[1]宿迁学院机电工程学院,宿迁223800 [2]成都大学机械工程学院,成都610106

出　　处：《真空科学与技术学报》2019年第3期226-229,共4页Chinese Journal of Vacuum Science and Technology

基　　金：四川省自然科学重点资助项目(16ZA0382);宿迁学院高层次人才资助项目(201805)

摘　　要：为兼顾罗茨泵的高容积利用率和高容积效率及动平衡要求,基于普通抛物线转子型线,通过由密封用同心顶突圆弧的设计,大幅提高形状系数和容积利用率;并就顶突抛物线转子的形状系数和容积利用率等,进行与常见圆弧、渐开线转子的对比实例运算。结果表明:顶突转子的"头轻脚重"截面特征,迎合了转子系统动平衡要求等;顶突转子的最大形状系数随顶突半角具有明显的线性递减规律,且对叶数变化的灵敏不高,3°顶突半角时分别为1.58、1.48、1.41;2叶顶突转子较普通转子在1°～8°顶突半角间的最大形状系数增效为0.6%～8.16%,最大容积利用率增效2.68%～16.79%;3、4叶顶突转子的最大形状系数、最大容积利用率及容积效率均优于常见的圆弧、渐开线转子;顶突转子增效明显,且结构简单,易加工。为罗茨泵其它型线的增效设计,提供一种创新途径和方法。A new rostellum parabolic rotor with an arc-shaped top was developed to enhance the shape coefficient and volume utilization rate.The shape coefficients and volume utilization rates of both the novel rostellum and conventional circular(or involute) rotors were numerically calculated.The calculated results show that the rostellum-rotor significantly outperforms the conventional circular rotor.To be specific,the bottom-heavy cross-section of rostellum-rotor improves the dynamic balance of Roots pump;as the half-angle increases,its max shape coefficient decreases,depending weakly on the lobe number(1.58,1.48 and 1.41 for 2,3 and 4 lobes,respectively).For 2 lobes and in 1°~8° range,the max shape-coefficient and volume-utilization rate of the rostellum-rotor are 0.6%~8.16% and 2.68%~16.79%,respectively,higher than those of the conventional ones.Besides,for 3 and 4 lobes,the rostellum-rotor has higher max shape-coefficient/volume utilization-rate/volume-efficiency than the circular(or involute) rotor does.

关 键 词：罗茨泵 抛物线转子 最大形状系数 最大容积利用率 密封突顶 

分 类 号：TB752.26[一般工业技术—真空技术] TH166[机械工程—机械制造及自动化]