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US 4,571,090 AGranted
Mixing systems
AssigneeGeneral Signal Corporation
InventorsRonald J. Weetman, Jerry A. Carpenter, Chandler K. Coyle, Keith T. McDermott, Roger N. Voss
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AssigneeGeneral Signal Corporation
InventorsRonald J. Weetman, Jerry A. Carpenter, Chandler K. Coyle, Keith T. McDermott, Roger N. Voss
Estimating the term…
Mixing systems for liquids having fibers suspended therein wherein the fibers tenaciously adhere to and accumulate on the leading edge of the impeller, thereby increasing the drag of the liquid on the impeller as it rotates and the consequent increase in the power required to rotate the impeller. Axial flow of the liquid in a tank is produced by the impeller within a draft tube. The leading edge of the blades of the impeller are inclined with respect to radial lines extending from the axis of rotation of the impeller beyond the angle of repose of the fibers on the leading edge. Also, the coefficient of friction of the portion of the impeller, extending from the leading edge toward the trailing edge thereof, to which the fibers adhere is reduced by providing the surface thereof with a low coefficient of friction material.
Apparatus for circulating liquids having fibers suspended therein in a region containing said liquids which comprises a draft tube disposed in said region containing said liquids, a shaft, an axial flow impeller having a plurality of blades, said impeller being disposed in said draft tube on said shaft, said shaft and said impeller being coaxial with said tube, said blades having opposite edges one of which leads the other as said impeller rotates, said leading edges being inclined with respect to radial lines from the axis of said impeller in planes perpendicular to said axis at angles greater than the angle of repose of said fibers on said impeller as said impeller rotates through said liquids and said liquids flow in the direction axially of said impeller through said draft tube thereby preventing the accumulation of said fibers on said leading edge and the increase of drag on said impeller which prevents the rotation thereof at sufficient speed to circulate said liquids without increasing the power applied to rotate said shaft.
Apparatus for circulating liquids having fibers suspended therein in a region containing said liquids which comprises a shaft in said region containing said liquids, an axial flow impeller having a plurality of blades, said impeller being disposed in said tank on said shaft, said blades having opposite edges one of which leads the other as said impeller rotates, said leading edges being inclined with respect to radial lines from the axis of said impeller in planes perpendicular to said axis at angles greater than the angle of repose of said fibers on said impeller as said impeller rotates through said liquids and said liquids flow in the direction axially of said impeller thereby preventing the accumulation of said fibers on said leading edge and the increase of drag on said impeller which prevents the rotation thereof at sufficient speed to circulate said liquids without increasing the power applied to rotate said shaft.
Dependencies are inferred from the claim text.