Abstract: Theoretical investigation of friction characteristics of a mud pump rubber piston was made by using inverse solution of hydrodynamic lubrication,and stable temperature field in the piston was calculated with finite element method.The friction force and temperature field of a 3NB-80 triplex pump piston were measured under actual working condition.The results of both theoretical and experimental investigation showed that the piston was in a mixedlubricating state,and extremely tiny particles in the mud could enter the piston and cylinder contact surface,resulting in abrasive wear.The friction work consumed during relative movement batween piston and cylinder not only remarkably decreased the mechanical efficiency of the pump but also caused considerable temperature rise in the piston.

摘要： 本文作者用流体动力润滑理论逆解法对钻井泵橡胶活塞的摩擦特性进行了理论研究,用有限单元法计算了活塞的稳态温度场,并在现场实际工况下实测了三缸单作用泵3NB-80活塞的摩擦力及温度场.理论及试验研究结果均表明:活塞在工作中处于混合润滑状态,泥浆中的特细颗粒能够进入活塞与缸套的接触表面,形成磨砺性磨损.活塞和缸套相对运动过程中所消耗的摩擦功不仅使泵的机械效率明显降低,而且也使活塞的温升达到可观的数值.

关键词: 活塞杆, 橡胶活塞, 温度特性, 钻井泵, 摩擦力, 润滑状态, 流体动力润滑理论, 有限单元法, 液膜厚度, 摩擦功