Rotary screen of the vertical pressure type having pulp stock fe

Details Rotary screen of the vertical pressure type having pulp stock fe Rotary screen of the vertical pressure type having pulp stock fe

1985-02-20

1987-02-10

Fisher, Richard V.

Liquid purification or separation

Filter

Movable prefilt distributor

162 55, 209240, 209273, 210413, 415121G, 416198R, B01D 2942, B07B 120

Patent

active

046421890

ABSTRACT:
A rotary pulp screening device of the vertical type is disclosed having a high screening efficiency and high capacity. The screen provides a streamline flow of pulpstock, and aims to supply a fairly constant flow of pulp through the screen from top to bottom, thus utilizing the full height of the screen. The screening device includes a cylindrical housing with a vertical cylindrical screen therein, a rotary impeller mounted for rotation within the screen, the impeller having a body whose top is substantially level with the disc ring and bottom is adjacent the lower end of the cylindrical screen, the body having a shape with circular axial cross section from the top to the bottom, whose diameter increases from the top to the bottom thus leaving a larger annular space at the top, and impeller blades radiating from at least a portion of the body of the impeller and extending to within a short distance from the screen for the height of the screen. The improvement comprises at least one substantially frusto-conical shaped baffle concentric with the body of the impeller, extending down from the top of the screen adapted to divide flow of pulp stock entering the screening device, and direct the divided flows to different vertical locations on the pulp screen.

REFERENCES:
patent: 68356 (1867-09-01), Evans
patent: 310469 (1885-01-01), Schlatter
patent: 1134304 (1915-04-01), Westbye
patent: 3081873 (1963-03-01), Cowan et al.
patent: 3400820 (1968-09-01), Nelson
patent: 3713536 (1973-01-01), Hooper
patent: 4066547 (1978-01-01), Hoks
patent: 4268381 (1981-05-01), Hooper
patent: 4374728 (1983-02-01), Gauld

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