Structural Parameters Optimization of Rectangular Sealing Ring Based on Orthogonal Test

The rectangular sealing ring mainly used in static sealing structure is usually subject to sealing failure, permanent deformation and other problems in practical use. The two-dimensional axis-symmetrical finite element analytical model of rectangular sealing ring during working is established to deal with the above prominent problems based on Von Mises yield principle, virtual work principle, axial symmetry principle and nonlinear contact theory, and orthogonal optimization is used to optimize the key structural parameters of rectangular sealing ring such as section width, section thickness and chamfer size to acquire the optimal combination scheme for key parameters of sealing ring, and contrastive analysis is done on the mechanical property of sealing ring before and after optimization. The research results indicate that: First the ranking of the factors affecting the performance of rectangular sealing ring in descending order is: section width, chamfer size, section thickness; Second the optimal combination for key structural parameters of rectangular sealing ring is: section width of 4 mm, section thickness of 3.5 mm, and chamfer size of 0.3 mm; Third compared with that before optimization, the maximum contact stress of rectangular sealing ring after optimization is improved by 21.87% on average, amount of compression reduced by 11.59% on average, and the maximum Mises stress increased only by 7.72% on average; fourth under the same axial assembly force, the optimized rectangular sealing ring has the contact stress increased, the amount of compression reduced and the risk of permanent deformation lowered; Fifth, Mises stress and contact stress of the optimized rectangular sealing ring are uniformly distributed, beneficial to improving the sealing performance. According to the conclusion, the rectangular sealing ring after parameter optimization can better satisfy the requirements on sealing performance and avoid permanent deformation.