Pulp screening device
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsHiromi Fukudome, Koukichi Maedera
Life of this patent
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Abstract
The present invention is a pulp screening device which is capable of screening a large quantity of pulp with low power, by preventing clogging of a screen cylinder. The device is provided with one or a plurality of vanes which revolve within an agitation chamber formed between a pair of inner and outer screen cylinders, holding a predetermined small space from each of the inner and outer screen cylinders. The agitation chamber is practically partitioned in the circumferential direction by the vanes.
Claims14
A pulp screening device, comprising:
- an inner screen cylinder;
- an outer screen cylinder located outside the inner screen cylinder;
- an agitation chamber formed between said inner screen cylinder and said outer screen cylinder, into which a pulp suspension is fed;
- an inner exit chamber formed inside said inner screen cylinder into which a pulp suspension screened by said inner screen cylinder is discharged;
- an outer exit chamber formed outside said outer screen cylinder into which a pulp suspension screened by said outer screen cylinder is discharged;
- and
- one or a plurality of vanes which revolve within said agitation chamber, holding a predetermined small space from each of said inner and outer screen cylinders.
A pulp screening device, comprising:
- a pair of inner and outer screen cylinders;
- and
- one or a plurality of vanes which revolve within an agitation chamber formed between said inner and outer screen cylinders, holding a predetermined small space from each of said inner and outer screen cylinders;
- wherein the cross section of said vane is formed into the shape of a wedge extending at an acute angle from a revolution-direction tip end to both proximity portions closest to said inner and outer screen cylinders.
A pulp screening device, comprising:
- a pair of inner and outer screen cylinders;
- and
- one or a plurality of vanes which revolve within an agitation chamber formed between said inner and outer screen cylinders, holding a predetermined small space from each of said inner and outer screen cylinders;
- wherein the cross section of an inner discharge tube at a point where said inner discharge tube joins an outer discharge tube is set greater than the cross section of said outer discharge tube, pulp being passed through said inner screen cylinder and flowing in said inner discharge tube and also being passed through said outer screen cylinder and flowing in said outer discharge tube.
A pulp screening device, comprising:
- a screen cylinder;
- and
- one or a plurality of vanes which revolve within an agitation chamber formed outside or inside said screen cylinder, holding a predetermined small space from said screen cylinder;
- wherein a revolution-direction front portion of said vane includes a deflection wall for changing the circumferential flow of a pulp suspension in said agitation chamber to a radial flow, and said vane is formed so that a spacing between said vane and said screen cylinder widens gradually from a portion near said screen cylinder of said deflection wall toward a revolution-direction rear end.
A pulp screening device, comprising:
- a screen cylinder having a plurality of filter holes;
- and
- one or a plurality of vanes which revolve within an agitation chamber formed outside or inside said screen cylinder, holding a predetermined small space from said screen cylinder;
- wherein a plurality of conical hollows are provided in the peripheral surface of said screen cylinder which faces said agitation chamber, said conical hollows comprising respective conical surfaces intersecting with the agitation chamber side edge of said filter hole and the peripheral surface of said screen cylinder at at least one point;
- and
- said filter holes are formed to be offset from the center of said conical hollow in the direction opposite to the direction in which said vane revolves.
Dependencies are inferred from the claim text.