Modifying the Casing Geometry
By the term casing we understand two, seemingly different configurations: the volute casing (Fig. 27–1) and the diffusor provided with guide vanes (Fig. 27–2). These two configurations, while seemingly quite different, are based on the same design principles and serve the same purpose. Their task is to guide liquid from the impeller into the discharge nozzle of the pump. At the same time, they are usually designed so as to convert a part of the kinetic energy of the liquid that is exiting the impeller into pressure energy.
Unable to display preview. Download preview PDF.