In each centrifugal pump class, component characteristics vary according to the desired function of the pump. The impeller, usually made of brass, bronze, or iron, can be open or closed. Closed impellers have front and rear protective covers, while open impellers do not.

Open impellers are often used in low-power applications, and most of the weight of the impeller is supported by the hub. Open impellers are more efficient than closed impellers operating at the same speed because closed impellers suffer disc friction due to the close relationship between the rotating impeller shield and the fixed housing wall. However, open impellers are more prone to wear. Because the closed impeller maintains a small relative speed between itself and the fluid, wear is reduced. In addition, the enclosed impeller can handle moderate wear without affecting the general performance of the centrifugal pump.

In addition to open or closed specifications, the impeller can also be single or double suction. In a single-suction impeller, fluid enters the impeller from one side. In a double-suction impeller, fluid enters the impeller from both sides. The single suction impeller can be open or closed, but the double suction impeller is always closed. Single-suction impellers are the most common of the two.

Double-suction impellers, on the other hand, are usually used in the early stages of horizontal split pumps or vertical turbopump systems. In addition, the double volute can be used to reduce the radial bearing load, which is much higher in high flow pumps.

In applications where thrust is important, impellers can be designed with pumping blades to help remove water from behind the impeller to improve flow stability in high-flow applications. As the impeller rotates, the pumping blade pushes the fluid out, reducing the axial thrust on the back of the impeller and reducing the pressure. The pumping vane can also be used to remove abrasive.

The above content introduces the matters for attention of the impeller of the KNOLL centrifugal pump assembly. In addition, Shenzhen Oudejie Technology specializes in selling new original German imported KNOLL Kono pump, and promises to sell products are new original imported, while providing our customers with quotation, selection, product information and other services.