Patent ID: 6082890
Filing Date: 2000-07-04
Classification: B01F

Abstract:
A glass coated axial flow impeller, said impeller comprising a hub, having a centrally located hole, said hole having a central axis, said hole being sized for passage over a drive shaft having a longitudinal axis so that the central axis of the centrally located hole corresponds with the longitudinal axis of the shaft, said impeller having a plurality of angles and edges, all of which have a rounded configuration, said impeller further comprising at least two variable pitch blades, each blade having front and rear surfaces both defined by an inside edge having a leading end and a trailing end, an outside edge having a leading end and a trailing end, a leading edge connecting the leading end of the inside edge to the leading end of the outside edge and a trailing edge that connects the trailing end of the inside edge to the trailing end of the outside edge, said outside edge of each blade being from about 1.5 to 2.5 times the length of the inside edge, said blades being symmetrically attached to said hub at their inside edges so that the inside edges are at an angle of from about 45 to about 60 degrees from the central axis of the attached hub and their outside edges are at an angle of from about 50 to about 70 degrees from the central axis of said hub; provided that, the angle of the inside edges to the central axis of said hub is from about 6 to about 12 degrees less than the angle of the outside edges to the central axis of said hub, said hub and its attached blades being covered by a contiguous coating of glass.