Reparation av skadat pumphjul på axialfläktar

If the impeller corrosion is not severe or there are not many blisters, it can be repaired by repair welding. Brass is used for repair welding of copper impeller, and brass is also used for iron impeller. Repair welding is to heat the weldment to about 600 degree , hang tin at the repair welding place, and then use the gas welding flame to melt the brass rod into the blisters. When the thickness of the weldment is 14-20mm, use the No. 6 welding tip, and when the thickness is 20-30 mm, use the No. 7 welding tip. After welding, remove the heat source, cover it with asbestos board to keep it warm, and let it cool slowly to avoid cracks. After cooling, it can be machined. 

If the wear groove marks or partial wear is not serious, it can be polished with emery cloth, and it can also be polished if the thickness allows. The new or repaired impeller may be overweight during casting or machining, hindering the normal operation of the pump, or even damaging the shaft. Therefore, it is necessary to carry out static balance experiments to eliminate or reduce the focus phenomenon. The static balance method of the impeller is to use the weight removal method. 

The thickness of the iron sheet used for the impeller counterweight should be selected to be 3mm thinner than the wheel wall. The shape should be made into a circular arc ring concentric with the wheel rim, and made into several pieces of different lengths. The material of the iron sheet should be the same as the impeller or the density. flat. Then scribe the shape of the iron sheet, put the impeller after the experiment on the milling machine, and mill the iron filings equal to the weight of the central object on the lighter side according to the scribed shape. 

För varje nytt pumphjul eller reparerat pumphjul för en flerstegsfläkt ska ett enda statiskt balanstest utföras. Och trimma inloppet och utloppet på pumphjulet för att ta bort grader

https://www.jnblower.com/