水下湿式电连接器密封件寿命预测

摘要

Underwater wet electrical connector is a connecting device used to connect underwater equipment in the working environment of sea water,oil and drilling fluid.Due to its harsh working environment,its sealing technology is of great importance.The service life of the connector is largely determined by its seal's lifetime.Taking the compression set ratio as the indicator of degradation performance,the lifetime calculation of underwater wet electrical connector under constant temperature has been studied.By establishing the finite element model of thermoelectric coupling,the seal's temperature distribution under working condition has been attained.The life prediction model based on Arrhenius formula has been built.Based on the seal lifetime and compression set ratio measured at different temperatures in national standard test,using step by step search method programming formula's coefficients,the life prediction algorithm under the effect of temperature has been compiled.The relation of service life and permanent compression deformation rate under different temperatures could be attained by substituting the result of finite element calculation into the algorithm.The proposed method is of great importance for the life prediction of underwater wet electrical connectors.%水下湿式电连接器是一种工作在海水、油液及钻井液中的连接水下设备的连接装置,基于严酷的工作环境,其密封技术极其重要,因此密封件的寿命很大程度上决定了水下湿式电连接器的工作寿命.以压缩永久变形率作为老化特性指标,研究基于恒定温度作用下的水下湿式电连接器寿命计算方法.通过建立热电耦合的有限元模型,分析得到工况下密封件的温度分布.同时建立了基于阿伦尼乌斯公式的寿命预测模型,依据国标试验中测量出的不同温度下密封件寿命和压缩永久率对应的数据,通过逐步搜索法编程计算公式的系数,编写了温度作用下的寿命预测算法,将有限元计算结果代入算法,得到橡胶密封件的压缩永久变形率和温度对应与其寿命值的曲线关系图.该方法对水下湿式电连接器寿命预测具有重要意义..