轧机轴承新型防水密封结构的数值分析

摘要

Based on the multiphase flow k-ε model of CFD numerical method,the sealing performance of a new waterproof seal structure for rolling mill bearing was simulated by using the FLUENT software.The cause of sealing failure was analyzed,and the influences of the wear of waterproof seal felt,the rotating speed,the throttling gap on waterproof sealing effect were studied.The results show that the waterproof effect of the new waterproof seal structure can be improved by reducing the wear of waterproof seal felt,increasing the rotational speed and reducing the throttling gap.In order to improve the waterproofing performance of the new waterproof seal structure,the schemes of adding a sealing ring at the gap outlet and transforming the outlet of the exhausting water into a groove structure were proposed.The results show that the sealing ring added at the gap outlet can play a role of waterproofing,but the effect is not obvious.The water discharge at the gap outlet under the same conditions is reduced and the waterproofing effect is greatly improved after transforming the outlet of the exhausting water into a groove structure.%基于CFD数值方法多相流k-ε模型,利用FLUENT软件对某钢厂轧机轴承新型防水密封结构的性能进行数值模拟,分析其失效原因,研究防水密封毡圈磨损量、转速、防水节流间隙对防水效果的影响.结果表明,减少防水密封毡圈磨损量、增大转速和减小节流间隙,可提升新型防水密封结构的防水效果.为改善新型防水密封结构的防水性能,提出在间隙出口增设密封圈和将甩水出口改造为槽状结构的方案.结果表明:在间隙出口处增设密封圈可以起到一定的防水作用,但是效果不明显;而将甩水出口改造为槽状结构时,相同条件下间隙出口排水量减少,防水效果有较大改善.