基于Archard理论的浮动密封结构磨损特性试验研究

Wear characteristics of floating seal structure based on Archard theory

管线闸阀工作过程中,常常会因密封接触面的磨损而导致其密封失效。针对这一问题,以代号为Z943Y-300Lb的高压管线平板闸阀为例,对其浮动密封结构的磨损特性进行了理论推导、仿真分析和试验测试研究。首先,运用了任意拉格朗日-欧拉(ALE)方法和Archard磨损模型,对浮动密封结构启闭后的接触面磨损厚度进行了理论推导;然后,根据浮动密封结构特点,提出了以全局磨损量均方根值(RMS)为评价指标的方法;接着,利用ABAQUS软件,对浮动密封结构进行了摩擦动力学仿真分析,并研究了不同启闭次数、密封面宽度对浮动密封结构磨损特性的影响问题;最后,采用最小二乘法建立了高压管线平板闸阀密封面磨损量预测模型,预测磨损等厚度时所允许的磨损寿命,并根据试验测试结果对仿真结果的准确性进行了验证。研究结果表明:相对于其他区域,区域Ⅰ、区域Ⅱ的磨损量较大;启闭速度对闸阀密封结构的磨损寿命影响较大,随着启闭速度的增加,密封结构的区间磨损寿命呈现先增加、后减小的趋势;启闭速度为210 mm/s时,闸阀密封结构的磨损寿命最大;在一定的范围内,其磨损寿命随着密封面宽度增大而增加。该研究分析可为闸阀密封结构的优化设计及寿命预测提供理论基础。

Aiming at the problem of sealing failure of pipeline gate valves due to the wear of the contact surfaces of the sealing structure,taking the code Z943Y-300Lb high-pressure pipeline flat gate valve as an example,the wear characteristics of its floating seal structure were executed by means of theoretical derivation,simulation and experiment analysis.Firstly,by using the arbitrary Lagrangian-Euler(ALE)method and Archard wear model,the thickness of contact surface wear after opening and closing of the floating seal structure was executed by means of theoretical derivation.Then,according to the characteristics of the floating seal structure,a global wear root mean square value was proposed as an evaluation index.Based on the ABAQUS software,the friction dynamics simulation analysis of the floating seal structure was carried out,and the effect of different opening and closing speeds and seal face widths on the wear characteristics was explored.Finally,the predictive model for the amount of seal surface wear of high-pressure pipeline flat gate valve was established,the allowable wear life at the equal thickness of wear was predicted,and the simulation results were verified with the least squares method.The results indicate that comparing with the other areas,areaⅠand areaⅡhave a higher amount of wear.The opening speed has a large influence on the wear life of the seal structure of flat gate valve.As the opening speed increases,the interval wear life of the seal structure tends to first increase and then decrease.When the opening speed is 210 mm/s,the seal structure has the maximum wear life.Within a certain range,wear life increases as the width of the sealing surface increases.The research and analysis can provide a theoretical basis for the optimal design and life prediction of the seal structure of flat gate valve.