Abstract:The deformation and stress distribution characteristics of Yshaped rubber seal ring of an autoclave were analyzed by using finite element method (FEM),under the conditions of preinstallation,precompression and working state.The results show that the sealing of the sealing groove and cavity of the autoclave is mainly depended on the lip tip of the Yring,which is also the most vulnerable part.The relation of changes between the structural parameters and the stress of Yring was analyzed,and the structural parameters that had larger impact on the sealing performance of the Yring were obtained.Morevover,structure optimization of Yring was carried out by orthogonal test method.The results show that through optimization the Vonmises stress is reduced under the condition of ensuring the safe contact pressure of the contact surface,and the location of the maximum Vonmises stress is transfered from the original tip of the sealing lip to the inner side of the sealing lip,which effectively reduces the possibility of damage to the sealing lip tip.The increase in the angle of the lip and the decrease in the length of the Yring can save the material quantity.Therefore,the optimization of the Yring can reach the purpose of prolonging the service life and saving the material quantity.