气动流量阀阀座密封性能研究及结构优化

Valve Seat Sealing Performance Study and Structure Optimization of Pneumatic Flow Valve

利用有限元软件ANSYS建立气动流量阀阀座密封结构的二维轴对称模型,以流体渗透压力(Fluid Pressure-Penetration)的加载方式模拟阀座密封结构的介质压力负载,研究介质压力、预紧弹簧力、阀座结构参数等对阀座密封结构密封性能的影响。结果表明:弹簧力与最大有效密封压力及无介质压力最大等效应变呈正相关;密封面外径及斜面倾角与最大有效密封压力及无介质压力最大等效应变呈负相关;密封面内径不影响最大有效密封压力。利用正交试验对关键密封参数进行了优化,优化后最大有效密封介质压力提高了14.14%,提高了阀座密封结构密封性能,而最大等效应变仅增大1.87%,对密封结构寿命影响很小。

In view of the valve seat sealing structure of pneumatic flow valve,the two-dimensional axisymmetric model was established with the finite element software ANSYS,and the medium pressure load of valve seat sealing structure was simulated with the loading mode of Fluid Pressure-Penetration.The influence of different sealing parameters including medium pressure,preloaded spring force and valve seat structure parameters on its sealing characteristics was studied.The results show that the spring force is positively correlated with the maximum effective sealing pressure and maximum effective strain of the medium-free pressure.The outer diameter of the sealing surface and inclination angle of the sealing surface are negatively correlated with the maximum effective sealing pressure and maximum effective strain of the medium-free pressure.The inner diameter of the cover does not affect the maximum effective sealing pressure.The critical sealing parameters were optimized using the method of orthogonal experiment.After optimization,the maximum effective sealing medium pressure is increased by 14.14%,improving the sealing performance of the valve seat sealing structure.While the maximum equivalent strain is only increased by 1.87%,which has little impact on the sealing structure life.