液膜润滑非接触式密封在胶乳泵上的开发应用

针对国内外胶乳泵用盘根密封及接触式机械密封存在的问题,提出采用新型液膜润滑非接触式密封。介绍了液膜密封的工作原理及基本结构,并进行了工业应用。结果表明,新型液膜密封不仅彻底解决胶乳泵密封泄漏严重、使用寿命短、能耗高的问题,而且降低了维修维护成本。

胶乳泵机械密封失效分析及解决方案

采用Meridium软件、六西格玛方法对胶乳泵机械密封故障数据进行分析,并制定改进方案。在泵的密封腔前端安装喉套,并控制喉套与泵轴的间隙。在原有机械密封冲洗方案(Plan 53A)的基础上,增加外部冲洗方案(Plan 32)。该改造方案实施后,该泵机械密封平均失效间隔时间从小于1个月延长到2年以上,取得了较好的经济效益。

胶乳泵故障分析及应对措施

介绍胶乳泵发生故障的基本特征,分析了该泵发生故障的原因,提出通过改造其内部结构,增设密封冷却水限流孔板的措施,消除了故障。

Wear fault diagnosis of an emulsion pump crank bearing

The total load on a crank bearing was calculated by performing a load analysis of the crank connecting rod mechanism. The Reynolds equation for hydrodynamic lubrication of the crank bearing was established at the Reynolds boundary condition and was then solved using the Holland method. From this the regular track of the beating axis was obtained. As the crank beating gradually wears the eccentricity ratio corresponding to the minimum oil film thickness increases gradually. The oil-bound film eventually breaks down, which allows friction and collision between the metal surfaces of the crank pin and the bearing. The rigid impact leads to excitation of high frequency vibrations at the natural frequencies of the connecting rod. The experiments show that the wear condition of the crank beating can be identified correctly through the vibration signature at the natural frequencies of the connecting rod. The degree of wear can be predicted accurately through the energy content of the high frequency bands.