In the running process of the pump, impeller driven liquid rotation in the pump, impeller surface with a liquid, liquid and the pump shell, the liquid motion internal have friction loss, and liquid movement in the vortex loss, impact damage, the liquid in the pump circulation due to overcome the gap resistance to consume the volume loss. Due to various losses in the pump, the effective power of water is always less than the shaft power. Only as much as possible to reduce the loss of the pump, in order to improve the efficiency of the pump.
In the three loss of horizontal multi-stage centrifugal pump, the mechanical loss and hydraulic loss are directly related to the roughness of the pump flow surface, the more rough the flow surface, the greater the loss. For the centrifugal pump with low specific speed, the loss is more serious, when n1=30, the friction loss of the main part of the mechanical loss can be increased to nearly 30% of the effective power. The mechanical loss and hydraulic loss of the pump can be reduced significantly if the surface roughness of the transition surface and the outer surface of the impeller can be reduced directly. Based on the above principles, the use of super - sliding metal coatings, can achieve the purpose of reducing the surface roughness to reduce the power loss of pump.
Due to the erosion of sediment, water flow, the corrosion of the medium, horizontal multi-stage centrifugal pump impeller will gradually wear and corrosion. The blade surface often form grooves or striations, or by cavitation damage, blade honeycomb holes, and even perforation. If the blade casting with holes, sand holes or slag, running after the surface is easy to appear the blowhole, even cracks.
Horizontal multi-stage centrifugal pump impeller repair in a variety of ways, impeller cavitation repair, there are many kinds of methods, such as the use of arc macromolecular composite coating support, powder spraying (welding), epoxy resin coated lip and rubber, nylon composite repair etc., as well as the use of stainless steel mosaic, such as welding. The use of epoxy resin polymer material coating has the advantages of simple construction method, low cost, etc., and the effect is good. By optimizing the proportion, to adjust the material performance, showing that the toughness of high strength of adhesion and absorption of impact energy, with a high resistance to cavitation and abrasion damage strength and hardness
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