Patent ID: 9422938
Filing Date: 2016-08-23
CPC Classification: F01D,F04D,Y10S

Claim Text:
1. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face has a profile defined by the following: where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 , wherein x and y define the actual coordinates of an impeller front shroud arcuate inner face, and D 2 (which is the impeller outside diameter) is 550 mm, and B 2 (which is the impeller outlet width) is 72 mm.