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采用有限单元法建立了机械密封O形辅助密封圈的数值分析模型.利用非线性有限元软件MSC.MARC计算了VonMises应力和接触密封界面之间的接触应力.采用高频疲劳试验机和高压水润滑O形密封圈试验单元组成的试验装置测得了摩擦力,并结合数值计算结果求得了摩擦系数.分析了O形辅助密封圈的压缩量及滑移速度对摩擦力的影响,讨论了O形辅助密封圈对机械密封的密封能力、泄漏特性的影响.结果表明:O形密封圈用于机械密封中的补偿机构会有微量泄漏;水润滑状态下接触密封界面能形成润滑水膜,摩擦力较小,有利于密封稳定运转.
The finite element method is used to establish the numerical analysis model of the O-shaped auxiliary seal of the mechanical seal. The contact stress between the Von Mises stress and the contact seal interface is calculated by the nonlinear finite element software MSC.MARC.Using high-frequency fatigue testing machine and high pressure water The friction coefficient was measured by the test device composed of the lubricating O-ring test unit and the friction coefficient was obtained by numerical calculation.The influence of the compression amount and sliding speed of the O-shaped auxiliary ring on the friction force was analyzed, and the O-shape The results show that there is a small amount of leakage in the compensation mechanism used for the mechanical seal in the O-ring seal, and the lubricating water film can be formed on the contact seal interface under the water-lubricated condition. The frictional force Small, conducive to seal stable operation.