After long-term use of the centrifugal pump, due to the trace impurities contained in the medium, the friction with the impeller will cause damage to the mill to different degrees, so the repair of the centrifugal pump impeller is also part of the maintenance work.
To do the maintenance of the centrifugal pump impeller, we must first understand the impeller material. The common impeller material is determined by the medium condition combined with the pump structure type. There are many kinds. For example, cast iron, cast steel, stainless steel, cast copper, etc., there are many specific grades in each category. The common repair methods for impellers according to different materials are as follows:
1: Copper wire repair method (for copper impeller)
For pinhole-shaped cavitation, as long as the holes are not connected into a piece, the pinhole can be punched with a copper wire, and the trowel can be used to smear. Before the treatment, the surface of the blade should be cleaned with rust and dirt. Then, the impurities in the pores are blown off with an oxygen-acetylene flame, and then the appropriate thickness of the copper wire is filled into the hole, and the copper is tapped with a pointed hammer. The wire is squeezed and squeezed into the hole, and then rubbed with a file.
2: Epoxy resin repair method According to the mix ratio, heat preservation gear pump order, take appropriate amount of epoxy resin, ethylenediamine, dibutyl phthalate, acetone in glassware, mix and mix well. Pay attention to the viscosity of the adhesive when mixing, and add the amount of acetone in an appropriate amount. The prepared epoxy resin is ready to be used within 20-30 minutes. Use a wool brush to draw epoxy resin, brush the surface of the blade with blisters and pores. When brushing, use a sharp cone to gently squeeze out the blisters and the bubbles in the middle of the pores. Apply as much as possible and gently scrape with a scraper. real. After the epoxy resin is cured for 1-2 hours, brush it again for 2 to 3 times. Be sure to make the surface of the blade smooth and smooth when painting after zui. After the painting is finished, the impeller is placed in an environment of 20-30 ° C and a relatively low relative humidity, and is slowly maintained for 48 hours. After the epoxy resin is completely cured, the contour of the impeller and the projections on the surface layer are trimmed with a file or a sander.
3: Accelerated steel repair method Single-stage single-suction centrifugal pump is a kind of cement-like adhesive repairing agent before curing. It has high strength, high hardness, no shrinkage and no rust after curing. It is suitable for steel, iron and other metal materials. The pores, cracks, and blisters are filled and repaired, and have a strong bonding effect. Before repairing, clean the rough rust and dirt around the repaired area and roughen it. The colloid in the plastic tube of the quick-form steel is taken out, and the two different colors of the inner core and the outer skin of the gel are quickly and fully smashed into one color (about 1 to 2 min) to achieve heat generation and softness. Before the colloidal steel colloid is to be solidified, it is firmly adhered to the repairing place, and is compacted with force (hand or tool) several times with the colloidal solidification process to enhance the adhesion of the adhesive to the blade. After the fusible steel is hardened, it is flattened with a file.
4: Gas welding repair method The impeller is placed on a charcoal fire and heated to 400-500 ° C. The tin is hanged at the repair welding place, and then the brass wire is melted into the groove or hole to be repaired by the oxygen-acetylene flame. Remove the charcoal fire, cover the insulation with asbestos board, and let the blades cool slowly to avoid cracks. After welding, the boring tool is used to finish the machining according to the original contour.
To do the maintenance of the centrifugal pump impeller, we must first understand the impeller material. The common impeller material is determined by the medium condition combined with the pump structure type. There are many kinds. For example, cast iron, cast steel, stainless steel, cast copper, etc., there are many specific grades in each category. The common repair methods for impellers according to different materials are as follows:
1: Copper wire repair method (for copper impeller)
For pinhole-shaped cavitation, as long as the holes are not connected into a piece, the pinhole can be punched with a copper wire, and the trowel can be used to smear. Before the treatment, the surface of the blade should be cleaned with rust and dirt. Then, the impurities in the pores are blown off with an oxygen-acetylene flame, and then the appropriate thickness of the copper wire is filled into the hole, and the copper is tapped with a pointed hammer. The wire is squeezed and squeezed into the hole, and then rubbed with a file.
2: Epoxy resin repair method According to the mix ratio, heat preservation gear pump order, take appropriate amount of epoxy resin, ethylenediamine, dibutyl phthalate, acetone in glassware, mix and mix well. Pay attention to the viscosity of the adhesive when mixing, and add the amount of acetone in an appropriate amount. The prepared epoxy resin is ready to be used within 20-30 minutes. Use a wool brush to draw epoxy resin, brush the surface of the blade with blisters and pores. When brushing, use a sharp cone to gently squeeze out the blisters and the bubbles in the middle of the pores. Apply as much as possible and gently scrape with a scraper. real. After the epoxy resin is cured for 1-2 hours, brush it again for 2 to 3 times. Be sure to make the surface of the blade smooth and smooth when painting after zui. After the painting is finished, the impeller is placed in an environment of 20-30 ° C and a relatively low relative humidity, and is slowly maintained for 48 hours. After the epoxy resin is completely cured, the contour of the impeller and the projections on the surface layer are trimmed with a file or a sander.
3: Accelerated steel repair method Single-stage single-suction centrifugal pump is a kind of cement-like adhesive repairing agent before curing. It has high strength, high hardness, no shrinkage and no rust after curing. It is suitable for steel, iron and other metal materials. The pores, cracks, and blisters are filled and repaired, and have a strong bonding effect. Before repairing, clean the rough rust and dirt around the repaired area and roughen it. The colloid in the plastic tube of the quick-form steel is taken out, and the two different colors of the inner core and the outer skin of the gel are quickly and fully smashed into one color (about 1 to 2 min) to achieve heat generation and softness. Before the colloidal steel colloid is to be solidified, it is firmly adhered to the repairing place, and is compacted with force (hand or tool) several times with the colloidal solidification process to enhance the adhesion of the adhesive to the blade. After the fusible steel is hardened, it is flattened with a file.
4: Gas welding repair method The impeller is placed on a charcoal fire and heated to 400-500 ° C. The tin is hanged at the repair welding place, and then the brass wire is melted into the groove or hole to be repaired by the oxygen-acetylene flame. Remove the charcoal fire, cover the insulation with asbestos board, and let the blades cool slowly to avoid cracks. After welding, the boring tool is used to finish the machining according to the original contour.
Testing Method:
step 1: Remove a test strip, taking care not to touch the reaction fields.
step 2: Immediately close the container again.
This protects the remaining test strips from humidity and guarantees strip integrity up to the expiry date indicated.
step 3: Dip the test strip for about 1 second into the fresh urine specimen.
Wipe off any excess urine on the rim of the vessel and blot the edge of the test strip on tissue paper.
step 4: Read the result by comparing the test fields with the color scale on the test pack after 30 to 60 seconds.
step 2: Immediately close the container again.
This protects the remaining test strips from humidity and guarantees strip integrity up to the expiry date indicated.
step 3: Dip the test strip for about 1 second into the fresh urine specimen.
Wipe off any excess urine on the rim of the vessel and blot the edge of the test strip on tissue paper.
step 4: Read the result by comparing the test fields with the color scale on the test pack after 30 to 60 seconds.
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