Structural Design Optimization On A Type Of Elastic Energy Storage Seal Ring

With the development of China’s industrial modernization,the requirements for the sealing accuracy of industrial equipment in various high-tech fields are becoming increasingly stringent.The energy storage sealing technology,which combines the excellent self-lubricating performance of PTFE materials and the high resilience of metal springs,has been widely used.The combination of the two can achieve high reliability sealing in a wide range of pressure.In this paper,the elastic energy storage seal system on the exhaust valve of an aerplane engine is taken as the research object.Adopt the method of finite element simulation analysis and experimental verification.Carry out all-round and multiangle comprehensive sealing performance reserch on elastic energy storage seal ring.The support height,lip thickness,root fillet radius and outer lip angle of the elastic energy storage seal ring are the four key structural dimensions related to the sealing performance.According to the four key structural dimensions,the MSN.marc three-dimensional finite element model of 16 seal jackets is designed.At the same time,Von Mises stress,maximum contact stress and contact width of the seal jacket were analyzed in the assembly and pressurization load stages respectively,and the influence of key structural dimension parameters on the sealing characteristics was obtained.The results show that the higher the support height,the thinner the lip thickness,and the larger the angle of the outer lip,the better the sealing performance.However,the size of the root fillet has little influence on the sealing performance,but has more obvious influence on Von Mises stress.In addition,for the support structure of elastic energy storage seal ring,two types of O type energy storage spring,including steel strip spring and steel wire spring,are constructed MSN.marc three-dimensional finite element model.The Von Mises stress and compression reaction force of energy storage spring under different compression amount are analyzed,and the influence rules of key structural dimension parameters on energy storage characteristics are obtained.It is found that for the steel band spring,the width of the steel band has little effect on the compression reaction,but it will affect the Von Mises stress,With the increase of the steel band thickness,the compression reaction and Von Mises stress will increase.For wire springs,Von Mises stress and compression reaction force increase with the increase of wire diameter.Finally,the optimized elastic energy storage seal ring is developed,the targeted test tooling is designed,the test verification platform is built,and the sealing and friction resistance tests are carried out for this type of seal ring.The results show that the sealing performance is improved with the increase of compression;With the increase of pressure load,the sealing performance is improved,but the friction resistance is decreased;At the same time,the test results also verify the reliability of the finite element analysis results.