高温高压球阀主密封结构自补偿设计研究

Self-compensation design of main seal structure of high temperature and high pressure ball valve

为解决球阀在高温高压等苛刻运行工况中遇到的主密封结构密封面受到的摩擦磨损,导致的阀门泄露、密封性能降低等问题,从球阀的密封原理出发,针对现有密封结构优缺点进行了研究。将计算机辅助设计以及有限元分析技术应用到球阀的结构设计过程中,根据密封性能对密封比压的要求,分析了密封面宽度与密封比压的关系,提出了利用流体介质自身压力提供阀座轴向推力迫使阀座补偿摩擦损失的方法,从而达到了自补偿密封效果,并利用建模软件Solid Works设计了自补偿主密封结构三维模型,利用自带网格划分插件进行了有限元仿真分析。研究结果表明:在产生摩擦磨损时,该设计能够通过自我补偿功能增加主密封结构的密封面宽度,从而降低了密封面上的密封比压,使得阀门密封性能得到提高。

In order to solve the ball valve in the harsh conditions encountered in the main sealing structure,the sealing surface of the friction and wear,resulting in leakage of the valve,sealing performance and other issues,based on the sealing principle of ball valve,the advantages and disadvantages of the existing sealing structure were studied,CAD and finite element analysis technique were applied to the design of the ball valve,requirements for sealing specific pressure based on sealing performance,the relation between sealing surface width and seal specific pressure was analyzed,a method was presented that used the pressure of fluid medium to provide axial thrust of valve seat and force the valve seat to compensate for the loss of friction,so as to achieve self compensation sealing effect,the model of self-compensation main seal structure was designed by using modeling software Solid Works,and the finite element simulation analysis was carried out by using the grid partition plug-in. The results show that in the friction wear,the design can through the self compensation function to increase the width of the sealing surface and sealing structure,there by reducing the sealing surface than the pressure seal,the valve sealing performance is improved.