基于三维的双螺杆压缩机转子干涉研究

提出一个数学方法来考察三维空间中螺杆驱动面处于接触状态下的螺杆转子齿间间隙分布,可以将机壳加工误差、壳体受热变形和滚动轴承游隙等几种误差统一考虑在内,计算各种位置偏差下转子齿间间隙分布的变化,进行螵杆转子干涉分析。计算结果表明,轴承孔加工误差、壳体受热变形和滚动轴承游隙引起转子轴位置变化,从而导致齿间间隙分布显著变化。其中部分位置关系使接触线上密封段的齿间间隙显著减小,从而增加了该种位置关系下转子擦伤、咬死的可能性。

STUDY OF ROTOR INTERFERENCE IN SCREW COMPRESSORS BASED ON THREE DIMENSIONS

A mathematical procedure is proposed to calculate the inter-lobe clearance between two mating screw rotors in contact state, in which the affect due to the bearing clearance and the imperfections in compressor housing manufacturing can be quantified with a higher accuracy. So the mathematical procedure can be used to quantify eventual rotor interference in screw compressors due to the bearing clearance and the imperfections in compressor housing manufacturing. The results show that the bearing clearances and the imperfections in casing manufacturing change the position of rotor shaft, consequently alter the inter-lobe clearance distribution along the contact line greatly. Some of the positions of rotor shaft minimize the inter-lobe clearance along the contact line which is in the hermetic segment, therefore they cause rotor interference possibly which lead to rotor abrasion or rotor seizing-up.