What is a Water Pump Impeller?

Impeller is the core part of the pump, is the main influence of efficiency, in specific working conditions, if the impeller design is not good will produce hydraulic loss and clearance loss at the pump inlet and vane. Then in the selection must choose a professional pump impeller manufacturer.

Centrifugal Pump Impeller Mainly Has the Following Three Forms.

1. Closed Impeller

Composed of vanes and front and rear cover plates. Closed impeller is more efficient and more difficult to manufacture. In the centrifugal pump is most used. Suitable for conveying clean water, solutions and other small viscosity of clean liquid without particles.

2. Semi-open Impeller

Generally there are two structures one for the front half-open, by the back cover plate and vane composition, this structure impeller efficiency is low, in order to improve efficiency need to be equipped with adjustable gap sealing ring another for the back half-open, by the front cover plate and vane composition, due to the application and closed pump impeller the same sealing ring? Efficiency and closed impeller is basically the same, and the blade in addition to conveying liquid, but also has: back blade or vice impeller sealing role. Semi-open impeller is suitable for conveying liquids containing solid particles, fibers and other suspended matters. Semi-open impeller is less difficult to manufacture, lower cost, and adaptable, in recent years in the refinery chemical centrifugal pump application gradually increased, and used to transport clear water and near clear water liquid.

3. Open Impeller

Only the blade and blade reinforcement, no front and rear cover impeller. The number of open impeller blades is less than 2-5 pieces. Water pump impeller efficiency is low, the application is less, mainly used for conveying high viscosity liquid and slurry liquid.
Centrifugal pump impeller impeller blade is generally back-bending blade. Blade has cylindrical and twisted two, the application of twisted blade can reduce the load of the blade, and can improve the suction performance of the centrifugal pump, improve the ability to resist cavitation, but the manufacturing difficulty is larger, the cost is higher. Water pump impeller refining chemical centrifugal pumps require impeller for casting or full welding seam welding of the overall water pump impeller. Welded water pump impeller is developed in recent years, mostly used for casting poor performance of metal materials, such as iron and its alloys, manufacturing of chemical special centrifugal pumps. The geometric accuracy and surface finish of the welded water pump impeller are better than the cast impeller, which is conducive to improving the efficiency of the centrifugal pump.

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