Patent ID: 9022732
Filing Date: 2015-05-05
Classification: F04D,F05C,F05D

Abstract:
1. A concrete volute pump, comprising: a centrifugal impeller having blades, the impeller being arranged for rotation about an axis and operable to direct a liquid towards a concrete volute arranged around the impeller, wherein the pump further comprises fixed elements arranged between the impeller and the volute, said fixed elements comprising a discontinuous barrier around the impeller, wherein for each fixed element, the difference between a radial distance from the rotational axis of the impeller to an end of the fixed element closest to the impeller, and the radial distance from the rotational axis of the impeller to an end of a blade furthest away from the axis of the impeller, represents from 1 to 10% of the radial distance from the rotational axis of the impeller to a periphery of the impeller, and wherein, for each fixed element, the difference between the radial distance from the rotational axis of the impeller to a volute nozzle and the radial distance from the rotational axis of the impeller to an end of the fixed element furthest away from the rotational axis of impeller, represents from 3 to 10% of the radial distance from the rotational axis of the impeller to said end of the fixed element furthest away from the impeller.