Centrifugal pump

F - Mech Eng,Light,Heat,Weapons – 04 – D

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Details

F04D 7/04 (2006.01) F04D 29/44 (2006.01)

Patent

CA 2541927

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.

La présente invention concerne une pompe centrifuge destinée à pomper des liquides contenant des contaminants essentiellement sous forme de particules solides. Cette pompe comprend une unité d'entraînement et une unité hydraulique. L'unité hydraulique comporte un corps de pompe (20) et une turbine de pompe (12) disposée rotative à l'intérieur du corps, cette turbine de pompe possédant un disque de recouvrement supérieur (14) et inférieur (16) et une pluralité d'aubes intermédiaires (18). L'invention se caractérise en ce qu'une paroi inférieure (22) du corps de pompe comportant une ouverture d'entrée centrale (24) possède au moins une unité de modification de contre-courant s'étendant en spirale (32, 34) sur le côté faisant face au disque de recouvrement inférieur qui s'étend partiellement ou entièrement autour de l'ouverture d'entrée.

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