Centrifugal separator
OwnerBenjamin V. Knelsoninventor
Life of this patent
Estimating the term…
Abstract
A centrifugal separator for use for example with the extraction of gold of the type comprising a bowl with a plurality of rings on the inner peripheral surface between which are provided openings for the injection of water between the rings into the interior of the bowl is modified by a number of further features. Thus firstly the rings and recesses between the rings are molded from a plastics inner which is cast in place within an outer rigid bowl. The openings are formed by punched depressions in the outer wall formed prior to the casting and then drilled subsequent to the casting to form a tangential opening. The shape of the recesses defines sides tapered outwardly toward a flat base at a shallow angle of the order of 15 degrees with the width of the base wider than the width of the injection openings.
Claims15
Apparatus for centrifugally separating intermixed materials of different specific gravities comprising a centrifuge bowl having a base and a peripheral wall surrounding an axis passing through the base and generally upstanding from the base to an open mouth, axially spaced inwardly projecting peripherally extending members defined on an inner surface of the peripheral wall so as to provide a peripherally extending recess between each member and the next adjacent member, and a plurality of openings extending through the peripheral wall from an outer surface to the inner surface thereof, the openings being arranged in the recess between each member and the next adjacent member and in spaced relation around the peripheral wall, means mounting the bowl for rotation about the axis, means for feeding materials into the bowl such that during rotation of the bowl they flow over the peripheral wall for discharge from the open mouth, and means for applying fluid to the outer surface of the bowl so as to pass through the openings and fluidize the materials in the recesses, each recess being shaped in cross section to define a pair of sidewalls extending generally outwardly from said axis and converging toward an imaginary apex, and a base wall transverse to and interconnecting the sidewalls through which said openings extend, the angle subtended between the sidewalls at the apex being less than 45.degree. and the dimension of the base wall from one sidewall to the other of the sidewalls is greater than the diameter of the openings and greater than 1/4 inch.
Apparatus for centrifugally separating intermixed materials of different specific gravities comprising a centrifuge bowl having a base and a peripheral wall surrounding an axis passing through the base and generally upstanding from the base to an open mouth, and axially spaced inwardly projecting peripherally extending members defined on an inner surface of the peripheral wall so as to provide a peripherally extending recess between each member and the next adjacent member, means mounting the bowl for rotation about the axis, means for feeding materials into the bowl such that during rotation of the bowl they flow over the peripheral wall for discharge from the open mouth, said bowl comprising an outer rigid metal support layer having an inner surface which is free from said members and recesses, said support layer having a plurality of openings formed by deformed portions punched in said support layer and a cast plastics inner layer having an outer surface lying in contact with and following exactly by casting therein the shape of the inner surface of the support layer and an inner surface defining said members and recesses whereby the members and recesses are formed wholly in and by the plastics material, said inner layer having holes therein drilled through said inner layer and through said deformed portions of said support layer.
Apparatus for centrifugally separating intermixed materials of different specific gravities comprising a centrifuge bowl having a base and a peripheral wall surrounding an axis passing through the base and generally upstanding from the base to an open mouth, axially spaced inwardly projecting peripherally extending members defined on an inner surface of the peripheral wall so as to provide a peripherally extending recess between each member and the next adjacent member, means mounting the bowl for rotation about the axis, means for feeding materials into the bowl such that during rotation of the bowl they flow over the peripheral wall for discharge from the open mouth, a housing surrounding the open mouth for collecting and confining the material discharged therefrom, said housing defining an annular channel which directs the material to an outlet duct and a liner for said channel which is a unitary integral molding from a wear resistant plastics material.
Dependencies are inferred from the claim text.