Krauss-Maffei Aktiengesellschaft

Helmut Wilkesmann

Gunther Hultsch

A centrifuge filter has a sieve drum normally rotated about its axis and normally fed internally with a filtrand that is separated when the drum rotates into solids lying on the inner surface of the drum and a filtrate that passes radially outwardly through the drum. A pusher plate is axially displaceable in the drum and has an outer edge closely juxtaposed with the drum's inner surface so that it can scrape solids from the surface. A cylinder is rotationally fixed to the drum and has a cylinder chamber that is axially subdivided by a piston into a front compartment and a rear compartment. This piston is jointly axially displaceable with the pusher plate and is axially biased backward. A liquid is introduced into one compartment to fill it as it rotates so that the liquid will be forced radially outward by centrifugal force and will urge the piston axially forward. This liquid is periodically drained off so that the force it exerts is less than that of the biasing means. In this manner the piston will move back and forth each time the rear compartment is filled and drained.

Pusher-type centrifuge filters

A wobble centrifuge of the type in which a centrifuge drum is rotated about an axis and, in addition, has its axis gyrated about another axis for the controlled discharge of the solids from the large-diameter end of the frustoconical drum structure. The latter comprises a support arrangement of bars and rings which retain the rods forming the drum wall and defining between them openings through which the liquid is centrifugally forced. According to the invention, means is provided for imparting a periodic relative longitudinal displacement to these latter rods thereby dislodging solids which may become wedged into the gaps between the rods.

Wobble centrifuge

A centrifuge, preferably of the type having an upright axis, e.g. a wobble centrifuge, is provided with a distributor for the product to be centrifuged. The distributor, which is rotatable with the shaft, e.g. by being connected to the drum or basket or to the drive shaft proper, is formed with a circular array of ribs which are concave in the direction of rotation and form acute angles with a circle centered on the axis of the distributor along the inner portion of the array, thereby improving the distribution of the product to the drum and accelerating the product in the direction of rotation while directing it outwardly onto the drum.

Centrifuge with product accelerator

A centrifuge has a drum to which a wobble or nutating motion is applied to discharge the centrifuged material over the edge of a wall of the perforated basket. The wobble or nutation is caused by tilting the axis of this wall relative to the axis rotation of the assembly. According to the invention, the basket is rotatably driven by an inner shaft and ride upon an inclined member driven by an outer shaft. The ratio n.sub.2 /n.sub.1 of the rotating speed n.sub.1 of the inner shaft and the rotating speed n.sub.2 of the outer shaft can be varied between values of -5 and +7 preferably -5 to +6 excluding values of about 0, 0.9, 1 and 2. The ratio determines the effective nutating angle.

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Munich, Germany

Helmut Wilkesmann