基于Archard理论的硬密封磨损寿命分析

Analysis of hard seal wear life based on Archard theory

针对硬密封阀门因密封面磨损而导致其密封失效的问题,采用Archard磨损模型,并借助ANSYS有限元软件模拟密封面的接触,以密封副初始挤压量为0.08 mm的硬密封为例,利用离散化的计算方法逐步对0.02,0.04,0.06 mm磨损深度下的密封面接触压力进行仿真求解,计算出不同磨损深度下密封面的正压力及穿透量并进行分析,推测其磨损趋势并得到密封面的磨损寿命,计算得到当密封失效时即密封副不再有挤压量时,阀门的使用寿命可达5 854次启闭,并发现硬密封的磨损可大致分为3个阶段进行。通过此类方法预测阀门使用寿命,可为硬密封阀门的结构设计及相关密封磨损的寿命研究提供一定的基础和参考。

For the problem of hard seal valve’s sealing failure due to the wear of the sealing surface,the Archard wear model was used,and the contact of the sealing surface was simulated with the help of ANSYS finite element software.Taking the O-shaped hard seal with the initial extrusion amount of 0.08 mm as an example,the contact pressure of the sealing surface under the wear depth of 0.02,0.04 and 0.06 mm was simulated and solved step by step by using the discrete calculation method to calculate the positive pressure and penetration of the sealing surface under different wear depth,speculate the wear trend and obtain wear life of the sealing surface.Through calculation,it is concluded that the service life of the valve can reach 5 854 times of opening and closing when the seal fails,that is,when the seal pair no longer has extrusion,and it is found that the wear of the hard seal can be roughly divided into three stages.Predicting the service life of the valve by this method can provide a certain basis and reference for the structural design of the hard seal valve and the life study related to seal wear.