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Centrifugal pump impeller maintenance work to do first of all to understand the impeller material, the common impeller material is based on medium conditions combined with the pump structure to determine, there are many. Such as cast iron, cast steel, stainless steel, bronze, etc., each category there are many specific grades according to different materials impeller common methods of repair are the following:
1: copper repair method (for copper impeller)
For the pinhole-like cavitation, as long as its holes are not connected into a film, can be used to hit the pinhole of copper wire, file rasp light can be. Before treatment, first with a grinder to remove the blade surface rust, dirt, and then use an oxygen-acetylene flame blown vent debris, and then to the hole filled with the appropriate thickness of copper wire, while hammering with a sharp hand, the copper Squeeze the wire, squeeze it into the hole, and finally file it flat with a file.
2: epoxy repair method according to the mix, the order of insulation gear pump take the right amount of epoxy resin, ethylenediamine, dibutyl phthalate, acetone on a glassware, mix well. Pay attention to the viscosity of the adhesive stirring, adding the amount of acetone appropriate. Prepared a good epoxy resin is best used within 20-30min. With a wool brush dipped in epoxy resin, brush the surface of the leaves trachoma, pores at the brush with a sharp cone gently out of the trachoma, stomata in the middle of the bubble, try to spread evenly coated at the same time with the scraper gently screed real. After curing epoxy resin 1-2h, then painted 2 to 3 times. Brush the last time, be sure to smooth the blade surface smooth. After brushing, the impeller placed in 20-30 ℃ and lower relative humidity environment, slowly curing 48h. After the epoxy is completely cured, the profile of the impeller and the protrusions on the finish are trimmed with a file or sander.
3: Rapid steel repair method Single-stage single suction centrifugal pump is a cement before curing adhesive repair, high strength after curing, high hardness, no shrinkage, no corrosion, suitable for steel, iron and other metal materials appear Of the pores, cracks, trachoma fill and repair, etc., with a strong bonding effect. Before the repair, it will clean up and roughen the rust, dirt, etc. around the site to be repaired. Take out the plastic tube in the plastic tube of the speed steel tube, knead the two different colors of the gel core and the outer skin quickly and thoroughly into one color (about 1 ~ 2min) quickly and reach the softness of heating. Before the rapid steel colloid to be solidified, the force glued to the repair, and with the gel curing process (hand or tool) multiple compaction, enhance glue and leaf adhesion. Fast steel hardened, rasp file flat.
4: Gas welding repair method The impeller on the charcoal fire heated to 400-500 ℃, at the repair welding of tin, and then the oxygen-acetylene flame to the brass wire to repair the need to repair the groove or hole, welding after the move To charcoal, with asbestos cover insulation, let the leaves slowly cooling, so as to avoid cracks. Welding after filing press the original contour for processing trimming.
Centrifugal pump impeller repair method
Centrifugal oil pump after long-term use, due to the media will contain trace impurities, friction with the impeller will wear damage to varying degrees, so the centrifugal pump impeller repair is also part of the maintenance work.