Patent ID: 6796707
Filing Date: 2004-09-28
Classification: B01F

Abstract:
An impeller for use in a mixing vessel, comprising:a hub; an inner blade portion extending directly from the hub and angled in a first direction, and said inner blade portion comprising a planar first portion and a twisted second portion, wherein the angle of attack of the inner blade portion gradually changes along a radial length of the twisted second portion; an outer blade portion disposed radially outward from the inner blade portion, the outer blade portion being twisted to have a gradually changing angle of attack along its radial length less than the angle of attack of said inner blade portion; and a connector element connected to both said inner and outer blade portions providing radial spacing between respective inner and outer blade portions, wherein the inner blade portion has a radial length that is longer than a radial length of the outer blade portion, and wherein the outer blade portion is angled in a second direction opposite to the first direction.