Jun 06, 2020
Centrifugal pump impeller is also called working wheel or runner. It is a component that converts energy. Its geometry and size have a decisive influence on the performance of the centrifugal pump, which is determined by hydraulic calculation. When choosing the impeller material, in addition to considering the machine under the action of centrifugal force
Mechanical strength. Also consider the wear and corrosion resistance of the material. At present, most centrifugal pump impellers are made of cast iron, cast steel and bronze.
The form of centrifugal pump impeller is divided into two types of single suction type and double suction type according to the structure. The single-suction impeller is shown in Figure 2-3. It absorbs water on one side, and the front and rear covers of the impeller are asymmetric. Single-suction impeller is used for single-suction centrifugal pump. The double-suction impeller absorbs water on both sides as shown in Figure 2-4, and the impeller cover is symmetrical. Double-suction impeller is used for double-suction centrifugal pump.
The form of the centrifugal pump impeller is divided into three types: closed type, open type and semi-open type according to its cover plate. An impeller with two cover plates is called a closed impeller, as shown in Figure 2-5(a). There are 6-12 blades bent backwards between the cover plates. This type of impeller has high efficiency and wide application. Only the back cover. The impeller without the front cover. Called a half-open impeller. As shown in Figure 2-5(b). An impeller with only blades and no cover is called an open impeller, as shown in Figure 2-5(c). The semi-open and open impeller blades are few, generally only 2 to 5 pieces. It is mostly used to transport sewage pumps containing solids, fibers, and suspended solids.