Centrifugal pump impeller (also known as the work wheel) The role of the impeller is to pass the mechanical energy of the prime mover through high-speed rotary motion to the liquid is to be pumping liquid to obtain energy, it is the core components of the centrifugal pump. Select the impeller material, in addition to considering the centrifugal force has sufficient mechanical strength, but also consider the material wear resistance, corrosion resistance. At present, most of the impeller cast iron, cast steel, bronze, hard plastic and alloy steel and other materials also have some applications. The shape and size of the impeller are determined experimentally and hydraulically. According to the way into the water can be divided into single suction impeller and double suction impeller. Single-suction impeller front cover opened with a hole in the water, the rear cover is not imported, impeller front cover and rear cover were asymmetric shape. Double-suction impeller front and rear covers are open hole water, it is absorbent on both sides, before and after the cover is symmetrical shape, generally used for large flow centrifugal pump. Impeller according to its cover is divided into closed impeller, semi-open impeller and open impeller in three forms. Has two front and rear covers, known as the enclosed impeller. This type of impeller is the most widely used, the aforementioned single suction impeller and double suction impeller belong to this type of impeller, the blade is generally more, usually 6 to 8, and more to 12; only the rear cover without the front Cover, known as semi-open impeller; there is no complete front and rear cover, known as the open impeller. In the transport of sewage pumps containing suspended solids, in order to avoid clogging, often using semi-open impeller or open impeller, which is characterized by fewer leaves, usually only 2 to 5 pieces.
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