双唇型油封的密封性能及其结构优化

利用有限元分析软件模拟分析双唇油封主唇区域的静态接触压力分布,并与单唇油封的静态接触压力进行比较;同时分析双唇油封安装后副唇的位移和变形。结果表明:油封的腰部结构不同导致双唇油封主唇区域密封效果低于单唇油封;副唇的位移和变形导致在实际运行中副唇与旋转轴存在空隙,影响防尘效果。为改善双唇油封的性能,提出采用渐进式腰部结构代替原弓形腰部结构和采用较长的防尘唇的双唇型油封结构优化方案。结果表明:采用渐进式腰部结构的双唇油封的主唇口接触压力曲线更接近单唇油封,密封效果优于普通双唇油封;采用较长的防尘唇,且安装时使防尘唇与旋转轴之间具有一定的过盈量,可以使防尘唇在油封装配变形后仍保持与旋转轴接触,减少了防尘唇唇尖与旋转轴之间的空隙,能够有效地提升防尘效果。

The Sealing Performance and Structure Optimization of Double Lip Oil Seal

The static contact pressure distribution in the main lip area of the double lip oil seal was simulated and analyzed by finite element analysis software,and the static contact pressure was compared with that of the single lip oil seal.The displacement and deformation of the minor lip after the installation of the double lip oil seal were analyzed.The results show that the sealing effect of the main lip area of the double lip oil seal is lower than that of the single lip oil seal due to the different waist structure of the oil seal,and the displacement and deformation of the minor lip cause the gap between the minor lip and the rotating shaft during actual operation,which affects the dust proof effect.In order to improve the performance of the lip seal,an optimized scheme was proposed,in which the the original bow waist structure was replaced by progressive waist structure and a long dust proof minor lip was adopted.The results show that the main lip contact pressure curve of the double lip seal after adopting the progressive waist structure is closer to that of the single lip oil seal,and the sealing effect is better than that of the ordinary double lip seal.By adopting a long dust proof lip and ensuring that there is a certain interference between the dust lip and the rotating shaft during installation,which can make the dust proof lip keep contact with the rotating shaft after the oil seal is deformed,so the gap between the dust proof lip tip and the rotating shaft is reduced,and the dust proof effect can be effectively improved.