Simulation Analysis And Experimental Research On New Type Hydraulic Rubber Sealing Ring

The sealing ring is an important component in the hydraulic cylinder to prevent leakage and improve work efficiency.Therefore,in the development of hydraulic technology,it is of great significance to carry out the research on the sealing mechanism and performance of the sealing ring.In this research,hydraulic seals were the research object.According to the transformation relationship between the kinetic energy and elastic potential energy of the spring and the spiral structure of the spring,the numerical analysis model of the new N-shaped seal was established by the finite element method,and the sealing performance of the reciprocating seal was studied;And set up a reciprocating sealed test bench for verification.(1)The optimization analysis was carried out through the controlled variable method and the orthogonal experiment,and the changed law of each stress of the optimized N-shaped sealing ring under static sealing conditions was discussed.The research shows that when the chamfer of the main sealing surface is 0.7 mm,the chamfer at the top of the groove is 0.2 mm,the chamfer at the bottom of the groove is 0 mm,the groove depth is 3.0 mm,and the groove spacing is 0.9mm,the N-shaped sealing ring was on the basis of ensuring the seal,the values of the mechanical parameters were small.At this time,the maximum Von-Mises stress generated is 7.9 MPa,the maximum shear stress is 4.5 MPa,and the maximum contact stress is 11.3 MPa.(2)By changing the material parameters,moving speed,medium pressure and friction coefficient,analyzed the stress change law of the N-shaped sealing ring during the inner and outer strokes under the dynamic sealing conditions.Studies had shown that with the increase of material hardness,the contact stress of the N-shaped sealing ring continues to increase.The VonMises stress had a larger gap during the inner stroke and a smaller gap during the outer stroke;when the piston rod moved at a low speed,it would produced the creeping phenomenon caused the Von-Mises stress and contact stress to be large,which was easy to aggravate the wear of the sealing ring and cause stress concentration;the Von-Mises stress and contact pressure increase with the increase of the medium pressure,and the fluctuations generated when the inner and outer strokes alternate.Large;the greater the friction coefficient,the greater the starting friction,and the more obvious the stress relaxation of the N-shaped sealing ring.If the friction coefficient was too small,the contact stress would be smaller,and leakage would easily occurred during the reciprocating motion.(3)Use the indirect coupling method to conduct thermal-structural coupling analysis of Nshaped seal ring,O-shaped seal ring,Y-shaped seal ring,and rectangular seal ring,and conduct comparative research in combination with related simulation data.Studies had shown that: the temperature rise caused by frictional heat was dominant under dynamic sealing conditions;when the medium pressure is 1-2 MPa,the stress values of the N-shaped sealing ring were smaller than other commonly used sealing rings.At this time,the sealing performance of the N-shaped sealing ring was better and the service life was longer.When the medium pressure is 1-7 MPa,the contact stress of the N-shaped sealing ring maintained a linear growth.Under the premise of ensuring the sealing,the contact stress was smaller than other sealing rings and the energy loss was smaller,which was beneficial to the long-term use of the sealing ring.(4)In order to verify the theoretical analysis results,the tension and pressure distribution test experiment of the N-shaped sealing ring was carried out based on the reciprocating sealing experimental device.The results showed that when the moving speed of the piston rod was low,the N-shaped sealing ring was prone to crawling,and the friction force between the piston rod and the piston rod increased;with the speed increased,the friction force first decreased and then slowly rose;When the moving speed of the piston rod is 0.4 m/s,the surface of the N-shaped sealing ring was covered with a uniform oil film,which could effectively reduced the sudden change of friction;when the medium pressure is 5 MPa,the N-shaped sealing ring Compared with the O-shaped sealing ring and the Y-shaped sealing ring,the friction force was relatively small and the change amplitude was relatively stable,which was consistent with the theoretical analysis and verifies the correctness of the theoretical analysis.