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(11)    Patent No :    AP 1938   
(21)    Application No :    AP/P/2005/003410   
(22)    Filing Date :    15.06.2004   
(24)    Date of Grant &    16.01.2009   
(45)    Publication :

(30)  Priority Data
(33) Country    (31) Number    (32) Date
AU    2003903024    16.06.2003

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
(73) Applicant(s) WEIR MINERALS AUSTRALIA LTD, 1 Marden Street, Artarmon, New South Wales 2064, Australia

(72) Inventors

WALKER Craig I., Australia

WATERMANN Anton, Australia

(74) Representative



(51)  International  Classification   F04D 29/38 (2006.01)    F04D 29/22 (2006.01)
F04D 29/44 (2006.01)   

(54)    Title

Improved pump impeller

(57)    Abstract

An impeller for use in a centrifugal pump, the impeller (20) including a shroud having opposed faces, an outer peripheral edge portion and a rotation axis, a plurality of pumping vanes on one of the faces of the shroud and extending away from the rotation axis each pumping vane having an outer peripheral edge portion, and a plurality of auxiliary vanes (26) on the other face of the shroud, the auxiliary vanes of each having an outer edge portion wherein the dimension Da from the rotation axis to the outer peripheral edge portion of the shroud is greater than the dimension Db from the rotation axis to the outer edge portion of the auxiliary vanes.


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