Chemistry: physical processes
Patent
1972-06-21
1976-05-11
Krizmanich, George H.
Chemistry: physical processes
233 46, B04b 120, B04b 702
Patent
active
039557561
ABSTRACT:
A screw conveyor centrifuge of the type having a hollow cylindrical and/or conical shaped bowl or shell and a conveyor screw extending through the bowl. The bowl and the screw are both rotatable, but at different rotative velocities. A solid-liquid mixture is fed into one end of the conveyor and the solid portion thereof is transferred away from the opposite end after being separated out of the liquid as it is conveyed along the centrifugally rotating bowl by the screw. The liquid portion of the mixture is conducted away from a receiving point intermediate the ends of the conveyor by way of fluid drain structure disposed immediately adjacent the outside surface of the hub of the screw means. In several embodiments, the fluid drain structure consists of pipes extending axially from the receiving point through holes in portions of the flights of the screw to a drain chamber disposed immediately adjacent the beginning end of the conveyor screw. These pipes are detachably mounted and interchangeable with pipes of varying cross-section and lengths. Also, the radial position of the pipes may be changed to adapt to varying liquid levels in the bowl. Other embodiments use a multiple helix screw with alternate channels serving as the fluid drain structure. The flights intermediate the alternate channels may be interrupted at their rims or have apertures therethrough in the area of the receiving point.
REFERENCES:
patent: 3268159 (1966-08-01), Kern
patent: 3285507 (1966-11-01), Shapiro
patent: 3620442 (1971-11-01), Halloran
Flottweg-Werk Dr. Georg Bruckmayer GmbH & Co. KG
Krizmanich George H.
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