Patent ID: 7584916
Filing Date: 2009-09-08
Classification: F04D

Abstract:
1. A centrifugal pump having a pump casing and a drive mechanism, comprising: a pump casing; an impeller having a central opening for attachment to a drive mechanism of a pump, a periphery and a drive side on which said central opening is located, said impeller having at least one vane radiating outwardly from a central axis of said impeller; at least one cutting structure positioned on said drive side of said impeller located proximate said periphery of said impeller; and a cutting ring element positioned adjacent said drive side of said impeller and having an outer circumferential edge and an inner circumferential edge that is radially distanced from said central opening and positioned proximate said periphery of said impeller, said cutting element ring having at least one cutting member extending between said outer circumferential edge and said inner circumferential edge to be radially distanced from said central opening of said impeller and positioned adjacent said at least one cutting structure of said impeller at said periphery of said impeller, said at least one cutting member being structured and positioned to interact with said at least one cutting structure of said impeller at said periphery of said impeller to effect cutting of solids near the periphery, and on said drive side, of said impeller.