热机耦合作用下冲击螺杆钻具传动轴密封性能分析  

Sealing Performance Analysis of Impact Positive Displacement Motor Drive Shaft under the Action of Thermal Mechanical Coupling

作　　者：石昌帅[1] 赵念刚 邓娟 付玉坤[3] SHI Changshuai;ZHAO Niangang;DENG Juan;FU Yukun(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China;AECC Chengdu Engine Co.,Ltd.,Chengdu Sichuan 610500,China;Engineering Technology Research Institute of PetroChina Southwest Oil and Gas Field Company,Chengdu Sichuan 610017,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]中国航发成都发动机有限公司,四川成都610500 [3]中国石油西南油气田分公司工程技术研究院,四川成都610017

出　　处：《润滑与密封》2021年第3期34-43,共10页Lubrication Engineering

基　　金：四川省应用基础研究项目(19YYJC1058);西南石油大学青年科技创新团队项目(2018CXTD03)。

摘　　要：针对高温、三维复合运动(往复+旋转)耦合作用下冲击螺杆钻具传动轴总成密封失效问题,设计氢化丁腈橡胶热老化试验,基于热老化试验数据建立热老化效应冲击螺杆钻具传动轴总成O形密封圈三维有限元模型,采用有限元方法研究流体压力、温度、摩擦因数和往复速度对传动轴总成O形密封圈静密封及动密封性能的影响。结果表明:静密封状态下高应力区位于O形密封圈右侧,高接触压力区位于O形密封圈内接触面、外接触面和侧面,最大von Mises应力和最大接触压力随着流体压力和温度的增大而增大,最大接触压力整体上随着摩擦因数的增大而减小;动密封状态下最大von Mises应力和最大接触压力在往复速度为0.4 m/s和摩擦因数为0.25出现异常规律,最大von Mises应力和最大接触压力随着流体压力和温度的增大而增大。由此建议密封圈在静密封和动密封状态,在往复速度小于0.4 m/s和较小摩擦因数下运行。Aimed at the sealing failure of drive shaft assembly of impact positive displacement motor under the coupling of high temperature three-dimensional compound motion(reciprocation+rotation),the heat aging test of hydrogenated nitrile butadiene rubber was designed.Based on the data of thermal aging test,the three-dimensional finite element model of O-ring seal of drive shaft assembly of impact positive displacement motor with thermal aging effect was established.The finite element method was used to study the influence of fluid pressure,temperature,friction coefficient and reciprocating velocity on the static and dynamic sealing performance of O-ring.The results indicate that under the static sealing condition,the high stress zone is located on the right side of the O-ring,the high contact pressure zone is located on the inside contact surface,the side contact surface and outside contact surface of the O-ring,the maximum von Mises stress and the maximum contact pressure are increased with the increasing of fluid pressure and temperature,and the maximum contact pressure is decreased with the increasing of friction coefficient.Under the dynamic sealing condition,the maximum von Mises stress and the maximum contact pressure have abnormal regularity when the reciprocating velocity is 0.4 m/s and the friction coefficient is 0.25,and the maximum von Mises stress and the maximum contact pressure are increased with the increasing of fluid pressure and temperature.Therefore,it is suggested that the sealing ring should be operated in a reciprocating speed less than 0.4 m/s and a small friction coefficient under the static and dynamic sealing states.

关 键 词：冲击螺杆钻具 传动轴总成 密封性能 接触压力 

分 类 号：TB42[一般工业技术]