After long term use of centrifugal pump, because the medium will contain trace impurities, friction with impeller will cause damage to different extent. Therefore, repair of impeller of centrifugal pump is also a part of maintenance.
To do well in impeller maintenance, we first need to know the material of the impeller. The common impeller material is determined by the medium and the pump structure. There are many kinds. For example, cast iron, cast steel, stainless steel, cast copper and so on. There are many specific brands in each category. According to different material impeller, common repair methods are mainly as follows:
1. copper wire repair method (for the impeller of copper material)
For pinhole cavitation, as long as the hole is not connected into available copper hit the pinhole, with a file to file. First with the blade surface grinder remove rust and dirt before treatment, and then use the oxygen acetylene flame blowing in the air and debris to the hole filling the appropriate thickness of the copper wire and copper wire tip hammer, will be squeezed, to Kong Zhong, finally using a file. Stainless steel chemical pump
2. epoxy resin repair method
According to the mixture ratio, the heat pump in order to take the amount of epoxy resin, ethylene diamine, dibutyl phthalate, acetone mixed, mix in glass. When mixing, pay attention to the viscosity of the adhesive and the dosage of acetone in proper amount. The prepared epoxy resin is best used in 20-30min. The epoxy resin used for wool brush, brush blade surface blisters, stomata, brush with cone blisters, gently squeeze out the air hole in the center of the bubble, as far as possible evenly coated, and gently scraping compaction scraper. After curing the epoxy resin 1-2h, brush it 2~3 times. When the last one is painted, make sure that the blade surface is smooth and smooth. After the end of the brush, the impeller is placed at 20-30 centigrade and low relative humidity, and the 48h is cured slowly. To be fully cured epoxy resin, trimming the impeller contour line and the convex surface layer on the file or polishing machine.
3. speed steel repair method
Single stage single suction centrifugal pump is a kind of adhesive curing clay like repairing agent, after curing, high strength, high hardness, no shrinkage, no rust, suitable for steel, iron and other metal materials have pores, cracks, voids at filling and repair, has a strong binding effect. Before repairing, the floating rust and dirt around the repair place are cleaned and roughened. Remove crash colloid in a plastic tube steel, will hand them into a fast fully with the core and skin in two different colors of the colloidal materials (1 ~ 2min), reached a fever soft as well. In the crash of steel before solidification to colloid, hard to repair cement, and the curing process with colloidal force (hands or tools) repeatedly compaction, enhanced adhesive and blade adhesion. Quick hardening steel, using a file.
4. welding repair method
The impeller is heated up to 400-500 DEG C in the charcoal, hanging tin in welding, and then the oxygen acetylene flame to melt into the groove or hole Huang Tongsi need repair, welding after removal of charcoal, with asbestos insulation cover, let the leaves slowly cooled, so as to avoid cracks. After welding, with a file for processing and repairing according to the original contour line.
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