Pump casing

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

Patent

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Details

F04D 29/66 (2006.01) F04D 7/04 (2006.01) F04D 29/42 (2006.01) F04D 29/44 (2006.01) F04D 29/68 (2006.01)

Patent

CA 2726843

A pump casing for a centrifugal pump, which comprises an inlet opening, a discharge outlet, and a transition sur-face extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface arranged for separating an in use exit flow of material in the discharge outlet from an in use recircula-tion flow of material in the main pumping chamber. The transition surface has a cutwater having a profiled section which compris-es a protrusion which extends irregularly from an otherwise generally rounded arched or U-shaped transition surface and is con-figured such that, in use, the velocity and/or turbulence resulting from the in use flow of the material being pumped in the main pumping chamber is reduced.

L'invention concerne un corps de pompe pour pompe centrifuge qui comporte une ouverture d'entrée, une sortie de refoulement et une surface de transition s'étendant entre une surface périphérique interne de la chambre de pompage principale et une surface périphérique interne de la sortie de refoulement, la surface de transition étant agencée pour séparer un flux de matière en sortie en service dans la sortie de refoulement d'un flux de matière en recirculation en service dans la chambre de pompage principale. La surface de transition comporte un bec de volute ayant une section profilée qui possède une protubérance qui s'étend de façon irrégulière depuis une surface de transition en forme de U ou voûtée généralement arrondie et est configurée de sorte qu'en service la vitesse et/ou les turbulences résultant du flux en service de la matière pompée dans la chambre de pompage principale soient réduites.

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