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

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.