双头单螺杆泵定子衬套力学行为分析

Analysis of Mechanical Behavior for Double Helix Single Screw Pump Stator Lining

为研究双头单螺杆泵定子衬套的受力状态及内轮廓线的变形规律,分析了内压、压差、材料非线性、橡胶泊松比等多种因素对定子衬套应力、应变及内轮廓线变形规律的影响,并拟合出双头单螺杆泵定子衬套在均匀内压作用下内轮廓线位移的方程式及非均匀内压下内轮廓线最大位移公式。分析结果表明:均匀压力下,衬套应力、应变呈周期性变化,内轮廓线位移呈正弦规律变化,位移与内压成线性关系;压差作用下,衬套应力、应变最大值向压差作用处转移,内轮廓线变形规律发生改变,位移及其变形幅度均增大;衬套橡胶泊松比微小的变化即会对衬套变形产生非常大的影响。因此,实际生产中应注意注胶工艺及泊松比的变化。研究结果为定子、转子过盈量的选取及线型的优化设计提供了理论基础,对提高双头单螺杆泵工作效率和使用寿命具有重要工程实际意义。

In order to study the forced state and deformation regularity of an inner contour line of a double helix single screw pump stator lining,then analysing the internal pressure,pressure difference, material nonlinearity and Poisson＆#39;s ratio of the rubber by FEM analysis software,the effects of the factors on stress and srain of a stator lining and deformation regularity of the inner contour line were analysed,and a displacement equation under uniformity internal pressure and maximum displacement formula under heterogeneous internal pressure of the inner contour line of a stator lining were fitted. The results show that the stress and strain of the stator lining vary periodically and the displacement is by sinusoidally varying of the stator lining inner contour line under uniform internal pressure,and displacement varying is linear relation as internal pressure varying.Under pressure difference,the maximum of stress and strain transfer to the location of pressure difference,and the deformation reg-ularity is changed,moreover,the values and varying ranges of displacement increase together.A tiny change of Poisson＆#39;s ratio of the rubber can cause great effect on the deformation of the stator lining. Therefore,the rubberizing and varying of Poisson＆#39;s ratio must be payed close attention during pro-duction,so as to enhancing the mechanical property of rubber.The work herein establishes a theoret-ical foundation for the choice of interference fit and linetype optimization design,and it has significant purport in engineering for improving work efficiency and useful life of the double helix single screw pump.