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建立了X形(星形)密封圈的有限元计算模型,研究了预压缩量、摩擦因数、介质压力、橡胶硬度对其密封性能和力学性能的影响。为提高密封圈的密封性能,延长使用寿命,对其横截面形状进行了改进,并对其静密封和往复动密封性能进行了分析。研究结果表明,X形密封圈的Von Mises应力和接触应力随着摩擦因数的增大而逐渐降低,但随介质压力、橡胶硬度的增大而增大;而结构的特殊性使得X形密封圈Von Mises应力随预压缩量的增大而减小;改进密封圈不但继承X形密封圈的优点,而且实现了三道密封功能,在保持良好密封性能的同时改善了结构的应力集中现象;特别是在往复动密封中,改进密封圈的应力波动较小,密封性能优于X形密封圈,避免了X形结构触角过早发生疲劳失效和撕裂,延长了密封圈的使用寿命。
A finite element model of X-shaped (star) seal was established. The effects of pre-compression, friction factor, medium pressure and rubber hardness on the sealing performance and mechanical properties were studied. In order to improve the sealing performance of the sealing ring, prolong the service life, improve its cross-sectional shape and analyze its static sealing and reciprocating sealing performance. The results show that the Von Mises stress and contact stress of the X-ring decrease gradually with the increase of the friction coefficient, but increase with the increase of the medium pressure and the hardness of the rubber. The special structure of the X-ring seals Von Mises stress decreases with the increase of pre-compression. Improved ring not only inherits the advantages of X-ring, but also achieves three sealing functions to improve the stress concentration of the structure while maintaining good sealing performance. In particular, In the reciprocating seal, to improve the seal ring less stress fluctuations, sealing performance is superior to the X-ring, to avoid premature X-shaped structure tentacles fatigue failure and tear, extending the service life of the seal ring.