| O-rings are widely used in sealing devices due to their superior sealing performance,simple sealing structure and relatively low manufacturing cost.The durability of the O-ring can play a key role in the effective sealing of the sealing device.At the same time,the nonlinear factors such as the mechanical,thermodynamic and tribological properties of the O-ring are extremely important for the durability of the O-ring.The impact of the O-ring seal on the sealing device is therefore of great significance.This paper takes the O-ring seal independently as the research object,supplemented by the seal ring durability test system independently in the Institute of Advanced Manufacturing and Automation Technology of Northeastern University School of Mechanical Engineering and Automation.Based on the principle of hydraulic sealing,the analysis model of O-ring durability test system was established.The temperature field and force deformation and sealing leakage result of O-ring were obtained.Finally,the O-ring temperature and seal leakage were measured.The experimental data were compared with the theoretical analysis results and simulation results.The feasibility of the model was verified and the durability test system of the seal was optimized.The specific work is as follows:(1)The research status and recent progress of the durability of O-rings at home and abroad in recent years are reviewed,including the research on the leakage performance and service life of O-rings,and the main research contents,research methods and research of this paper are determined.(2)The movement and stress of O-rings during reciprocating motion,as well as the mechanical structure and working principle of the durability test system of the seals were studied.The durability test system was studied under the O-ring seal due to the force generated.The theoretical relationship between the gap size and the amount of leakage caused,and the leakage formula of the test system under the force is derived.The frictional heat generation of the seal due to friction was studied,and the relationship between frictional heat generation and force was obtained,and the influence of temperature on the life of the O-ring was analyzed.(3)The three-dimensional model of the seal durability test system is established,and the reciprocating motion law is analyzed based on this.Based on the theory of elastic mechanics,the deformation of the seal is analyzed,and the frictional heat generation of the seal is analyzed based on tribology.(4)The simulation analysis of the test system when loading the seal was completed.The finite element model of the seal was established by using large-scale finite element simulation software.The static analysis and force deformation analysis of the seal were realized.The stress distribution and force deformation distribution of the seal were obtained,and the external force was leaked to the seal.The impact of the relationship.Based on this model,the frictional heat generation simulation analysis was carried out,and the influence of external force on the life of O-ring was obtained.(5)The sealing leakage and temperature measurement experiments of the O-ring were carried out.The experimental data of the actual leakage and temperature change of the O-ring under working conditions were obtained through experiments.The variation of O-ring leakage and temperature with time was analyzed.Comparing the experimental results with the theoretical analysis results and the simulation analysis results,the reliability of the model establishment is verified,and the data support is provided for the next model optimization.In this paper,the establishment of theoretical analysis model,the establishment of simulation analysis model and the combination of experiments,the durability of O-rings are studied,and the leakage and temperature changes of O-rings under working conditions are obtained.The experimental results are compared with the theoretical and simulation results.The correctness of the analytical model is verified.It provides a basis for further study of the sealing performance of the O-ring and provides data for the study of the O-ring sealing structure. |
