1. School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
The wear of the sealing surface is the key factor resulting in the declination of sealing performance and the loss of seal-life under the condition of oil free lubrication. A numerical simulation method of wear-thermal-stress coupling between seal and piston rod in the process of cap-seal (CL) sealing was established based on the finite element technique and the modified Archard wear model, and the change rule of seal performance and life in the process of wear and the effect of medium pressure on sealing characteristics were analyzed. The key structure parameters of C-ring in CL seal were optimized by applying the orthogonal design method based on the established simulation model, in order to realize the optimization target of getting minimum drop of maximum contact pressure in seal face and maximum seal-life, and the best parameter combination scheme was obtained. The results of numerical simulation and optimization design were verified by the experimental platform of Stirling engine piston rod seal performance test device, and the wear condition of contact surface of CL seal after wear was measured. The result of wear test was consistent with that of numerical simulation, and the sealing performance and life of the CL seal have been greatly improved after optimization, which confirms the accuracy of the numerical simulation method.
Wen-han CAO,Jun GONG,Hong-gang WANG,Gui GAO,Yuan QI,Dong-ya YANG. Numerical simulation on wear-thermal-stress coupling behavior of cap-seal seal and optimization design. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 258-267.
Fig.1Geometric model and key structural parameters of cap-seal seal
Fig.2Finite element model of cap-seal seal
Fig.3Von Mises stress distribution of cap-seal seal under three working conditions
Fig.4Contact pressure distribution of cap-seal seal under three working conditions
Fig.5Contact pressure distribution of C-ring under different medium pressures
Fig.6Von Mises stress distribution evolution of cap-seal seal in wear operation process
Fig.7Contact pressure distribution curve of C-ring in wear operation process
Fig.8Node temperature curve of C-ring in wear operation process
Fig.9Wear profile curve of C-ring in wear operation process
Fig.10Maximum contact pressure curve of C-ring in wear operation process under different medium pressures
N
A/mm
β/（°）
B/mm
α/（°）
1
1.6
4
1.6
8
2
1.7
2
1.7
4
3
1.8
0
1.8
0
4
1.9
?2
1.9
?4
5
2.0
?4
2.0
?8
Tab.1Level schedule of orthogonal experiment
Fig.11Orthogonal experiment results of C-ring structure parameters
Fig.12Range analysis of C-ring structural parameters
结构参数
A/mm
β/（°）
B/mm
α/（°）
优化前
1.8
0
1.8
0
优化后
1.6
?4
1.9
?8
Tab.2Comparison of structural parameters of C-ring before and after optimization
Fig.13Structure outline of C-ring after optimal design
Fig.14Comparison of sealing performance of C-ring before and after optimization
Fig.15Physical map of components for cap-seal seal
Fig.16Schematic diagram of sealing performance experimental platform for piston rod cap-seal
Fig.17Curve of medium pressure of sealing chamber versus time
Fig.18Comparison of wear profile of C-ring before and after optimization
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