弹簧比压对机械密封性能影响的分形分析

在考虑磨损引起端面表面形貌变化的基础上,引入分形理论分析了弹簧比压对平衡型机械密封泄漏率和端面摩擦特性的影响,并针对GY-70平衡型机械密封进行了试验研究。理论分析和试验结果表明,尽管弹簧比压的变化有时不足以改变机械密封的端面摩擦状态,但随着弹簧比压的增大,摩擦副之间的润滑介质已相对减少,端面摩擦特性逐渐恶化。机械密封存在一最佳弹簧比压,不同的工况条件下,最佳弹簧比压是不相同的。正确选择弹簧比压是实现机械密封长寿命低泄漏率的关键。

Analysis of Influence of Spring Pressure on Performance of Mechanical Seals by Fractal Theory

While the fact that abrasion leads to change of surface topography was taken into consideration,the influence of spring pressure on both leakage rate and friction characteristic of balanced mechanical seals was investigated by fractal theory.Several GY-70 type balanced mechanical seals were tested.Both theoretic analysis and test results indicate that as spring pressure increases,the friction is more serious because lubrication medium between two end faces reduces,though the increase of the spring pressure may not be enough to change the face friction state of mechanical seal.There exists an optimum spring pressure for mechanical seal operation.Under different operating conditions,identical type mechanical seals may possess different spring pressure.Appropriate selection of spring pressure is key to the mechanical seal operation under the best condition.