The pump fitting impeller can be designed with different structures, wherein the closed impeller is mainly composed of the blade and the front and rear cover plates. The closed impeller has high efficiency and is difficult to manufacture, and is most widely used in centrifugal pumps. It is suitable for conveying clean water without particles, such as clean water and solution.
There is also a semi-open impeller that can be used to deliver liquids containing suspended solids such as solid particles, fibers, etc. in practical applications. The semi-open impeller is less difficult to manufacture, lower in cost, and more adaptable. It is gradually used in centrifugal pumps for refining and chemical industry, and is used to transport clean water and liquids with similar water.
The other is an open impeller, consisting only of blades and blade stiffeners. The impeller of this pump fitting has low efficiency and low application, and is mainly used for conveying liquid with high viscosity and slurry liquid. The blades of the centrifugal pump impeller are generally back-bent blades. The blade has two kinds of cylindrical and twisted shapes. The application of the twisted blade can reduce the load of the blade, and can improve the suction performance of the centrifugal pump and improve the anti-cavitation ability.http://www.pump-casting.com/