Improvements relating to centrifugal pump impellers

Details Improvements relating to centrifugal pump impellers Improvements relating to centrifugal pump impellers

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 29/22 (2006.01) F04D 7/04 (2006.01) F04D 29/24 (2006.01)

Patent

CA 2725539

A centrifugal pump impeller includes front and back shrouds and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face having a radius of curvature (Rs) in the range from 0.05 to 0.16 of the outer diameter of the impeller (D2) The back shroud includes an inner main face and a nose having a curved profile with a nose apex in the region of the central axis which extends towards the front shroud, there being a curved transition region between the inner main face and the nose. Fr is the radius of curvature of the transition region and the ratio Fr/D2 is from 0.32 to 0.65. Other ratios of various dimensions of the impeller are also described.

Linvention concerne une turbine de pompe centrifuge qui comprend un flasque avant et un flasque arrière et plusieurs aubes de pompage disposées entre les flasques. Chaque aube de pompage comprend un bord d'attaque dans la zone d'un orifice d'admission de la turbine et un bord de fuite. Le flasque avant présente, dans la zone de l'orifice d'admission de la turbine, une face intérieure arciforme dont le rayon de courbure (Rs) représente 0,05 à 0,16 du diamètre extérieur de la turbine (D2). Le flasque arrière présente, dans la zone de l'axe central, une face intérieure principale et un nez à profil incurvé muni d'une pointe du nez, qui s'étend vers le flasque avant, une zone de transition incurvée séparant la face intérieure principale et le nez. Fr représente le rayon de courbure de la zone de transition, et le rapport Fr/D2 est compris entre 0,32 et 0,65. On décrit en outre d'autres rapports de diverses dimensions de la turbine.

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