Patent attributes
The impeller has a bottom disk, a top disk, and impeller blades sandwiched between the two. The top disk has an inner opening edge that defines an axial inlet opening. The impeller blades have a first radial inward section that extends radially inward beyond the opening edge. A blade contour on each impeller blade points toward the inlet side of the impeller. The blade contour first radial inward section extends from a transition portion near the opening edge under the top disk. The blade contour on the first radially inward section of the impeller blade extends radially inward yond the opening edge and forms a specified formula geometrical edge design. A second portion of the impeller blades extends radially outward from the transition portion, the transition portion and the second portion of the impeller blade are covered entirely by the top disk from the first formula impeller blade contour.
