常规螺杆泵定子有限元求解策略

FEM ANALYSIS POLICY FOR A GENERAL SCREW-PUMP'S STATOR

螺杆泵定子橡胶不仅是易损构件,而且它与转子的配合状况对螺杆泵的工作性能影响显著,为此需要围绕上述问题开展相关的研究工作。目前,还没有能够直接对实际工况下的定子橡胶的变形和受力状态进行测试的有效手段,因此对螺杆泵定子进行有限元分析自然是有益的尝试。利用有限元分析软件ABAQUS,对螺杆泵定子进行研究,得出了螺杆泵定子在不同工况下的受力状态和变形规律。针对常规螺杆泵受均匀和非均匀内压情况,对空间模型与平面应变模型所求出的定子的应力、应变和内轮廓节点位移进行了比较。通过对比分析论证了三维模型和平面应变模型所求出的定子橡胶衬垫在内压作用下其内轮廓线位移是一致的。因此,在这种情况下可以用平面模型来代替三维模型,从而大幅度提高了求解效率。

The rubber in a screw-pump's stator is not only susceptible to damage, but also to affect a screw-pump's work- ing performance by the conjugate situation between its stator and rotor.Recently, the effective method has been not found for testing the deformation and forced state of the rubber of a stator under a real working condition. The deformation principle of an inner contour line of the rubber is studied mainly and its stress and strain state subordinately. For a screw-pump's working situation, its forced state and deformation principle is re- searched firstly under an even inner pressure and secondly un- der a working pressure difference and under different assemble between its stator and rotor.The stress state and deformation principle of a screw-pump's stator has been obtained by FEM analysis software (ABAQUS) under different workng condi- tions. The stresses and strains of the stator and displacements of its inner-contour line under 3D model and plane strain model is verified to be almost coincident. Therefore, the plane model can replace 3D one and improve analysis efficiency.