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(11)    Patent No :    AP 2131   
(21)    Application No :    AP/P/2006/003574   
(22)    Filing Date :    20.10.2004   
(24)    Date of Grant &    07.07.2010   
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
SE    0302752-1    20.10.2003

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
(73) Applicant(s)


Market Street, Wilmington, DE 19801,
United States of America

(72) Inventors

LINDSKOG Martin, Sweden

(74) Representative


(51)  International  Classification   F04D7/04 (2006.01)    F04D29/16 (2006.01)

(54)    Title

Centrifugal pump

(57)    Abstract

The present invention relates to a centrifugal pump for pumping of liquids containing pollutions mainly in the form of solid particles, which pump comprises a drive unit, a hydraulic unit, whereby the hydraulic unit comprises a pump housing (20) and a pump impeller (12) rotationally arranged inside the housing, the pump impeller comprising an upper (14) and a lower (16) cover disc and a number of intermediate vanes (18). The invention is characterised in that a bottom wall (22) of the pump housing, having a central inlet opening (24), is arranged with at least one spirally extending back flow affecting means (32, 34) on the side facing the lower cover disc extending parts of or full turns around the inlet opening.

(56)    Documents Cited :    US 5516261 A    US 1879803 A


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