Water pump is a kind of machinery to transport liquid or pressurize liquid. It transmits the mechanical energy or other external energy of the prime mover to the liquid to increase the energy of the liquid. It is mainly used to transport liquid, including water, oil, acid-base liquid, emulsion, suspended lotion and liquid metal.

It can also transport liquid, gas mixture and liquid containing suspended solids. Technical parameters of pump performance include flow, suction head, head, shaft power, water power, efficiency, etc; According to different working principles, it can be divided into volume pumps, vane pumps and other types. The positive displacement pump uses the change of the volume of its working chamber to transfer energy; Vane pump uses the interaction between rotating blades and water to transfer energy, including centrifugal pump, axial flow pump and mixed flow pump.

During the working process of the pump, the water flowing in the pump is affected by the friction between it and the surface of the flow passage and pump impeller, as well as the viscosity of the water body. The energy consumed by the pump is mainly used to resist the flow friction and eddy current resistance of the water surface. The energy (head loss) consumed by water in the flow process is used to overcome the internal friction and the friction between water and equipment interface. If the surface of pump and impeller is smooth (this surface is called hydraulic smooth surface), the surface resistance is small. The energy consumption is small. Polymer composite materials are sprayed on the overflow surface and impeller of the pump to form a hydraulically smooth surface. The surface finish of the super smooth surface coating is 20 times that of the polished stainless steel. This extremely smooth surface reduces the stratification of the fluid in the pump, thereby reducing the turbulence in the pump, reducing the volume loss and hydraulic loss in the pump, and reducing the power consumption. The purpose of reducing the flow resistance loss is achieved, so as to improve the hydraulic efficiency of the pump. At the same time, the mechanical efficiency and volumetric efficiency can be improved to a certain extent. The density of the coating molecular structure can isolate the contact between air, water and other media and the base metal of the pump impeller, and minimize electrochemical corrosion and corrosion. In addition, the polymer composite material is a polymer with chemical corrosion resistance, which can improve the corrosion resistance of the pump and greatly enhance the ability of the pump to resist erosion and corrosion.