螺杆马达过盈量对输出性能影响研究

Study on Effect of Magnitude-of-interference on Output Performance of Screw Motor

螺杆马达是螺杆钻具的动力来源,其定转子之间的过盈量对螺杆马达的工作性能和使用寿命起着至关重要的作用。文中提出了螺杆马达性能评价准则,建立了螺杆马达流固耦合三维有限元模型,基于显式非线性瞬态动力学对0.1 mm、0.2 mm和0.3 mm这3种过盈量螺杆马达的接触力值、机械效率、容积效率、密封腔成腔稳定性进行了有限元分析。结果表明:随着过盈量的增加,定转子接触力值逐渐增大,螺杆马达容积效率逐渐升高,机械效率逐渐降低,高负载情况下0.2 mm过盈量螺杆马达密封腔稳定性较好,并且马达整体性能最好,在较低负载情况下,0.1 mm过盈量螺杆马达密封腔稳定性较好,其整体性能较好。研究结果可为螺杆马达的过盈量设计以及优选提供一定的参考。

Screw motor is the power source of screw drilling tool,and the interference between its fixed rotors plays an important role in the performance and service life of screw motor.The performance evaluation criteria of the screw motor are proposed.A three-dimensional finite element model for screw motor is established based on the explicit nonlinear transient dynamics.The contact force,mechanical efficiency,volumetric efficiency and cavity forming stability at the screw motors interferences of 0.1 mm,0.2 mm and 0.3 mm were analyzed by using the finite element method.The results show that with the increase in amount of interference,stator contact force value increases gradually,the screw motor volume increased efficiency,mechanical efficiency to reduce gradually,the motor seal chamber stability at an interference of 0.2 mm under high load condition is better,and motor best overall performance,he motor seal chamber stability at an interference of 0.1 mm under the condition of low load is good,its overall performance is better.The present results can provide reference for interference design and optimization of screw motor.