外加压静压型机械密封均压槽设计对动态性能的影响

摘要

Externally pressurized hydrostatic gas seal show good performance with low speed.Additionally,it can be easily adjusted by controlling gas source pressure.A good tracing ability keeps a seal away from malfunctioning when affected by misalignment and axial runout of non-floating ring.A perturbation method is applied to calculate dynamic coefficients of seal with integral and divided equalizing groove(s),and then tracing performance is calculated.The comparison of results between seal employing integral and divided equalizing groove(s) shows that although there is no obvious difference in axial properties,seal with divided equalizing grooves works with significantly higher angular direct dynamic stiffness and traces misalignment of non-floating ring better.%外加压静压气体密封在启停等低速运转状态下具有良好的性能,并且便于通过调节气源进行干预.密封在运行过程中会受到非浮动环的窜动和偏摆的影响,故需要良好的追随性以维持密封稳定有效工作.本文采用小扰动法分别计算了采用整周和分区均压槽的外加压静压气体密封的动特性系数,然后进一步计算追随性,并进行了对比.结果表明,采用不同均压槽形式的密封在轴向上的性质差别不大,但相比于采用整周均压槽,采用分区均压槽的静压气体密封具有显著更高的角向直接动刚度、更好的对非浮动环偏摆的追随性.