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.