Donald W Russell

US Patent:

7810747, Oct 12, 2010

Filed:

Oct 3, 2008

Appl. No.:

12/245038

Inventors:

Jason Douglas Allaire - Methuen MA, US
Donald Paul Russell - Kingston NH, US

Assignee:

Lawrence Pumps, Inc. - Lawrence MA

International Classification:

B02C 23/36
B02B 1/00
B07B 4/00

US Classification:

241 4606, 241241, 2412601, 241261

Abstract:

A device for reducing solids and increasing pressure in a fluid handling system has comminution and inducer sections in a housing upstream of a pump impeller. A rotor has a hub with a small inlet diameter and a larger outlet diameter and a helical rotor blade with its blade pitch angle progressively increasing from inlet to outlet as a polynomial function. The comminutor section has a larger diameter than the inducer section and comminutor vanes extending inward forming a vane edge effective diameter equal to the inducer section diameter. The rotor blade turning within the closing fitting cage of vane edges provides a crushing and shearing action to solids in the fluid flow. Cutouts on the blade edge provide additional crushing and shearing action against the vanes. The fluid passageway sectional area at the outlet is bigger than the throat of the downstream main impeller.