大一分析化學K1

1、What is wrong with the modern What is wrong with the modern centrifugal pumpcentrifugal pump? ?現在的離心泵有現在的離心泵有什么什么問題3Steven_TianjinTHERE IS NO DOUBLE VOLUTE TO PREVENT RADIAL THERE IS NO DOUBLE VOLUTE TO PREVENT RADIAL LOADING OF THE LOADING OF THE IMPELLERIMPELLER這里沒有雙螺旋來預防葉輪的徑向負載這里沒有雙螺旋來預防葉輪的徑向負載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這已經引起客戶安裝效率底的 “旁路”管線來防止在啟動時或運行在離泵的最佳效率點很遠的情況時軸的破壞和密封的損壞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.這意味著濕端留在管線上,并且沿著適配器的功率端被帶回到車間進行密封更換和維修.除非你安裝一個密封筒,或你使用分離密封設計,對于今天使用的大多數敞開式葉輪設計,對于進行一個初始的葉輪調整你將有一些麻煩.調整的方向根據不同的制造商不同MOST OF THESE PUMPS ARE OF THE BACK PULL OUT MOST OF THESE PUMPS ARE OF THE BACK PULL OUT DESIGNDESIGN. .大多數這些泵是后拽出設計大多數這些泵是后拽出設計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. .葉輪調整大多數從泵的軸承端進行葉輪調整大多數從泵的軸承端進行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.這意味著為了補償磨損(在泵送摩擦性物體時是很通常的問題),軸必須向泵的前蝸殼移動或,或在DURCO泵的情況下,向后板移動.這個移動能夠總共0.250英寸.無論在每種設置,密封的設置被擾亂并且緊接著是短的密封壽命.大多數工廠有這兩種類型的設計,它經常引起機械工的混淆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、供錯誤的機械密封由泵的制造商提供提供錯誤的機械密封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.除非你已經規(guī)定了一個特定的密封品牌和型號,否則密封通常是不平衡的設計,并且有不知道等級的材料,有非常限制性的應用并能引起大量的備件Most original equipment manufacturer (O.E.M.) seals will damage shafts (fretting) causing the use of shaft sleeves that will weaken the