倾斜菱形孔端面密封的性能研究

基于流体润滑理论模型,采用数值模拟的方法分析几何参数和操作参数对机械密封泄漏率、液膜刚 度和开启力的影响规律,探讨倾斜菱形孔上、下游泵送效应对密封性能的影响机理。结果表明,双向倾斜菱形孔织 构端面能够使机械密封的动压效应显著增强,泄漏率明显降低及液膜稳定性更可靠;在较低转速时,双向倾斜菱形 孔织构可使密封端面迅速打开,能够有效减少启动时两端面间的摩擦和磨损,同时还能降低倾斜菱形孔织构密封的 泄漏率;在研究的工况条件下,非倾斜菱形孔织构密封的液膜稳定性(即变工况自适应能力)在三者(即双向、单向与 非倾斜菱形孔织构密封)中是最佳的;并得到了倾斜菱形孔端面密封的反向开孔比、孔倾角、面积比和孔深等几何参 数的优化取值范围。

Performance of End Face Seal with Inclined Diamond Pores

Based on a liquid lubrication theory, influence of operating parameters and texturing parameters on open force, film stiffness and leakage was numerically investigated. Then upstream and downstream pumping principles of the inclined diamond pores were discussed. Results show that the liquid seal with bidirectional inclined diamond pores had larger hydrodynamic open force, more reliable liquid membrane stability and lower leakage than those with unidirectional. At low speed, bidirectional inclined diamond pores texture can make seal end faces opened quickly, and can effectively reduce the friction and wear between two end faces in the startup phase. At the same time, the leakage of the inclined diamond pores texture seal can also be reduced; Under the operation conditions of research, the liquid membrane stability (Self adaptive capacity of the variable conditions) of the non inclined diamonds texture seal was the best in the three (the bidirectional, unidirectional and non inclined diamond pores texture seals); And optimization range of reverse pores ratio, pores inclination angle, pores area rate and pores depth was obtained.