Method and device for dewatering of suspensions in movement

Details Method and device for dewatering of suspensions in movement Method and device for dewatering of suspensions in movement

1976-04-13

1977-08-16

Fisher, Richard V.

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Special forms and forming

68181R, 162 60, 162251, 210 77, 210 82, 210388, 210391, B01D 3300, D21C 918, D21D 522

Patent

active

040415600

ABSTRACT:
A method and apparatus for the thickening of a suspension of comminuted fiber material and liquid. A reciprocal screen assembly having a variable volume interior chamber is mounted for movement along the axis of a container through which suspension to be dewatered flows. Mechanical apparatus, such as a hydraulic cylinder actuated rod, moves the screen assembly in either the direction of flow of suspension in the container, or in the direction opposite thereto, and the screen assembly is relatively rotatable with respect to the container. During movement of the screen assembly in the direction of flow of the suspension (at about the same velocity as the suspension flow), liquid passes through the screen assembly into the interior chamber, and is expelled from the container. The screen assembly is moved more quickly in the direction opposite to the direction of suspension flow, and the variable volume of the interior chamber thereof decreases quickly so that backflushing of the screen assembly is effected. Even during backflushing, however, liquid is continuously moved from the interior screen chamber to be expelled from the container. Fins mounted on the screen assembly effect relative rotational movement of the screen assembly with respect to the container (to facilitate cleaning of the screen assembly) during movement in the direction opposite to the direction of suspension flow.

REFERENCES:
patent: 3372087 (1968-03-01), Richter
patent: 3579420 (1971-05-01), Richter
patent: 3595038 (1971-07-01), Bergholm et al.

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