大一分析化学K1

1、What is wrong with the modern What is wrong with the modern centrifugal pumpcentrifugal pump? ?现在的离心泵有现在的离心泵有什么什么问题3Steven_TianjinTHERE IS NO DOUBLE VOLUTE TO PREVENT RADIAL THERE IS NO DOUBLE VOLUTE TO PREVENT RADIAL LOADING OF THE LOADING OF THE IMPELLERIMPELLER这里没有双螺旋来预防叶轮的径向负载这里没有双螺旋来预防叶轮的径向负载Th

2、is has caused customers to install inefficient by pass lines to prevent shaft breakage and seal damage at start up or when running too far off of the best efficiency point of the pump这已经引起客户安装效率底的 “旁路”管线来防止在启动时或运行在离泵的最佳效率点很远的情况时轴的破坏和密封的损坏This means that the wet end is left on the piping and the powe

3、r end along with the adapter are brought back to the shop for seal replacement and repair. Unless you have a seal cartridge mounted, or you are using a split seal design, you will have trouble making an initial impeller adjustment with most of the open impeller designs in use today. The direction of

4、 adjustment varies with manufacturers.这意味着湿端留在管线上,并且沿着适配器的功率端被带回到车间进行密封更换和维修.除非你安装一个密封筒,或你使用分离密封设计,对于今天使用的大多数敞开式叶轮设计,对于进行一个初始的叶轮调整你将有一些麻烦.调整的方向根据不同的制造商不同MOST OF THESE PUMPS ARE OF THE BACK PULL OUT MOST OF THESE PUMPS ARE OF THE BACK PULL OUT DESIGNDESIGN. .大多数这些泵是后拽出设计大多数这些泵是后拽出设计THE IMPELLER ADJUS

5、TMENT IS ALMOST ALWAYS MADE THE IMPELLER ADJUSTMENT IS ALMOST ALWAYS MADE FROM THE BEARING END OF THE PUMPFROM THE BEARING END OF THE PUMP. .叶轮调整大多数从泵的轴承端进行叶轮调整大多数从泵的轴承端进行This means that to compensate for wear (a very common problem when pumping abrasives) the shaft has to be moved either towards th

6、e front of the pump volute or, as in the case of the Durco pump, back towards the back plate. This movement can be as much as a total of .250 inches (6 millimeter). In either case the seal setting is disturbed and short seal life follows. Most plants have both types of designs that causes confusion

7、with the mechanics.这意味着为了补偿磨损(在泵送摩擦性物体时是很通常的问题),轴必须向泵的前蜗壳移动或,或在DURCO泵的情况下,向后板移动.这个移动能够总共0.250英寸.无论在每种设置,密封的设置被扰乱并且紧接着是短的密封寿命.大多数工厂有这两种类型的设计,它经常引起机械工的混淆THE WRONG MECHANICAL SEALS ARE BEING THE WRONG MECHANICAL SEALS ARE BEING SUPPLIED BY THE PUMP SUPPLIED BY THE PUMP MANUFACTURERMANUFACTURER由泵的制造商提供提

8、供错误的机械密封由泵的制造商提供提供错误的机械密封Unless you have specified a particular seal brand and model number the seals are always unbalanced designs with unknown grades of materials, having very limited application and causing a profusion of spare parts.除非你已经规定了一个特定的密封品牌和型号,否则密封通常是不平衡的设计,并且有不知道等级的材料,有非常限制性的应用并能引起大量的备件Most original equipment manufacturer (O.E.M.) seals will damage shafts (fretting) causing the use of shaft sleeves that will weaken the