罗茨泵极限真空度及其预抽时间预测模型研究
李玉龙,宋陆昊,刘天涯,宋安然

Research on prediction models for limiting vacuum degree and its pre-pumping time of Roots pump
Yulong LI,Luhao SONG,Tianya LIU,Anran SONG
图1 转子轮廓构造及其坐标系构建
Fig.1 Rotor contour structure and its coordinate system construction