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The impeller is an important accessory of the canned pump, and its shape, size, processing technology, etc. have a decisive influence on the performance of the water circulator pump.

The function of the impeller is to transfer the energy input from the prime mover to the liquid. There are three main structural forms of water pump impellers: those with front and rear cover plates are called closed impeller; those with only rear cover plates are called semi-open impeller and those without front and rear cover plates are called open impeller. In addition, the structure of the blades can also be divided into cylindrical blades and twisted blades. Generally, closed-type impeller have 2-12 back-curved blades, which have high operating efficiency, for example, single-suction and double-suction centrifugal pump use this impeller, among them, the single-stage single-suction centrifugal pump impeller has axial force, so some impellers have balance holes at the roots of the blades. Half-open and open impellers have a small number of blades, generally 2 to 5, are mostly used for pumping slurry or granular liquid or sewage, such as the impeller of a sewage pump.

The impeller material of the water pump must have sufficient mechanical strength, and a certain degree of wear resistance and corrosion resistance. According to the requirements of the conveying medium, cast iron, cast steel, stainless steel or, for example, oil pump products, are usually used to convey flammable and explosive oils. Bronze impellers are used.