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(11)    Patent No :    AP 2035   
(21)    Application No :    AP/P/2006/003612   
(22)    Filing Date :    13.03.2006   
(24)    Date of Grant &    02.09.2009   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2004/7454    16.03.2005

(84)    Designated State

BW    GH   NA   ZM   ZW
 
(73) Applicant(s)

WEIR MINERALS AFRICA (PROPRIETARY) LIMITED, 31

Isando Road, Isando, Gauteng,
South Africa

(72) Inventors

GELDENHUYS Siegfried, South Africa

(74) Representative

HONEY & BLANCKENBERG
 
(51)  International  Classification   F04D29/24 (2006.01)    F04D 5/00 (2006.01)

(54)    Title

An impeller for a centrifugal pump

(57)    Abstract

A centrifugal pump (10) includes a pump casing (12) within which an impeller

(14) is mounted for rotation, cantilever fashion, on a shaft (16). The casing (12) has an axial inlet (20), and a peripheral volute (22) around the impeller

(14) leading to an outlet (24). The impeller (14) has axially spaced annular sides (26, 28) with radially outwardly arranged, rearwardly curved, vanes

(30)

between the sides. Outwardly of the sides, clearing corresponding sides of the

casing (12), auxiliary vanes (32, 34) are provided to generate a pressure gradient to prevent or counteract leakage of working fluid. Leading faces of


(56)    Documents Cited :    DE 3 246 605 A   DE 88 11 026 A

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