多头螺杆钻具等壁厚定子衬套的性能分析

Capacity Analysis of Multi-lobe Screw Drill with Iso-wall Thickness Stator

研究了多头螺杆钻具定子及其衬套的变形规律和应力分布,对其应力和应变的分布情况作了理论分析;研究了静压和压差耦合作用(实际工况)下,定子与转子啮合引起橡胶衬套的变形和应力的变化。对等壁厚定子及其衬套进行有限元分析,并与常规定子衬套的有限元结果对比,得出了其力学性能和密封性能优势的量化。结果表明:均匀压力下,等壁厚衬套的法相变形比常规衬套减小约50%且变化均匀;静压和压差耦合作用下,等壁厚定子衬套比常规定子衬套的临界接触压力大,减小速度慢;提高了螺杆钻具的工作性能和密封能力,为等壁厚定转子的优化设计提供了理论基础。

The strain and stress of stator and bushing in multi-lobe screw drill were analyzed theoretically to gain its deformation law and stress distribution. Meanwhile, pressure and pressure difference coupling were imposed to research the deformation and stress of rubber bushing caused by meshing under real working condition. The mechanical property and the superiority quantization of iso-wall thickness stator and bushing were acquired by contrasting the results of finite element calculation. The result shows that the method for the deformation of iso-waU thickness stator bushing is 50% smaller than the ordinary one under the same pressure. Under pressure and pressure difference coupling, the critical contact pressure of iso-wall thickness stator bushing is bigger than the ordinary one, redning speed slower than the ordinary one. It can improve the working and sealing performance, which provides the theoretical foundation for multi-lobe iso-wall thickness screw drill optimum design.