Impeller eccentricity

The volute type pump has its impeller mounted eccentrically within the volute. The degree of eccentricity governs the pressure that the pump can generate. If the impeller were concentric inside the volute, or equidistant, the pump would generate flow, but not much pressure or head (Figure 9-1). 

The mash is conveyed from the fruit mill to the press, and to and from the heat exchanger, by means of valveless eccentric spiral pumps, large impeller pumps or slow-running piston pumps. 

The Eirich miser granulator is a unique design commonly employed in ceramics and clay industries (Fig. 21-1616 ). Here both impeller blades and the chopper rotate on eccentrically mounted vertical shafts, while in addition the cylindrical bowl rotates. This provides a hybrid of mixer and tumbling granulation, and generally more spherical granules are produced than those achieved in other batch mixer processes. 

Sliding vane. Positive displacement pumps in which a multi-bladed impeller rotates inside an eccentric pump cavity. They are self-priming and deliver a non-pulsating flow. 

Gyratory Crushers Eccentrically rotating solid-cone impellers. High capacity usually finer grirHfing than jaw crushers. 

A rotary vane vacuum pump (Figure 5.5) is a rotating type of positive displacement vacuum pump in which an eccentrically suspended impeller slides tangentially past the inside wall of the stator (casing). Two or more vanes with the capability... 

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