Modernization of centrifugal impeller blades

Abstract

The increase of the energy intensity of the pumping equipment reflects general tendency of technology development: to transmit more energy without significant increase of mass and size parameters of their working bodies. It is represented in the “Directive on Determining the Requirements for the Design of Products Consuming Electricity” that forwards a claim for a 40% reduction of energy consumption in Europe by 2020. Considering the task as for the increase of energy intensity of the pump stage, the possibility of creating a higher head and efficiency increase with the same overall dimensions, flow rates and speed of rotation has been considered as a way of solving the task. This can be achieved by replacing the spatial blade system of a centrifugal impeller of low (ns = 65) specific speed by cylindrical blades, since such working bodies perform the process of energy transfer from impeller to working liquid in the most intensive way. It will provide for the head rise of impeller and for the simplification of its manufacturing technology.