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Apparatus-for-separating-impurities-from-fiber-suspensions

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Apparatus for separating impurities from fiber suspensions

Details

Inventors: Musselmann, Walter; Rienecker, Reimund; Kinzler, Herbert; Tra, Josef;
Assignee: J. M. Voith GmbH (DE)
Primary Examiner: Cuchlinski, Jr.; William A.
Assistant Examiner:
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen

The disclosure concerns an apparatus for separating impurities from a fibrous suspension. The apparatus includes a tiltable housing having a screen basket supported coaxially therein. A rotor is supported inside the screen basket. The rotor has three zones. There is an upstream zone communicating with the fiber suspension inlet, and inlet in the upstream zone is into the interior of the rotor and then outward past sorting vanes formed at the exterior of the rotor in the first zone and inside of the basket. Downstream of the transport vanes is a second baffle zone defined by a closed drum having transport vanes on the outside thereof. The suspension and impurities are moved downstream by the transport vanes in the second zone. Downstream of the second zone is a third zone with further means for moving impurities downstream, comprising either a centrifugal impeller in the form of vanes or a helical ring. The impurities outlet from the housing is downstream of the rotor and at the other end of the housing away from the inlet. The outlet for purified suspension is outside the screen basket nearer the inlet. A weir establishes a level of suspension in the housing.

DETAILED DESCRIPTION It is the object of the invention to effectively separate impurities from a fiber suspension, and particularly to separate, transport and properly thicken the impurities.
Desirable water removal from the impurities is another object.
The present invention provides an apparatus for separating impurities from fiber suspensions and comprises a housing having a horizontal axis or a tilted axis.
The housing contains a rotation-symmetrical screen basket.
There is an inlet at one end of the apparatus for suspension to be cleaned and it leads into the interior of the screen basket.
There is an impurities outlet for separated impurities at the other end of the apparatus.
There is a suspension outlet for the discharge of cleaned suspension from the region between the screen basket and the wall of the housing.
The suspension outlet is provided with weir means which maintain a minimum suspension level in the housing.
The level of the liquid in the housing can be adjusted via the weir means.
A rotor is disposed coaxially within the screen basket.
Preferably, the rotor is mounted in cantilever fashion only at one end thereof, namely, the end at which the inlet to the apparatus is situated, so that the outlet end of the rotor remains free of disturbing components which facilitates better control.
The interior of the screen basket contains a first, upstream zone.
In this zone, the rotor is open in that the inlet to the apparatus communicates into the rotor, and the rotor is essentially open so that suspension flows out of it.
The rotor in the first zone is provided with generally axially extending sorting vanes that are positioned at a radial distance from the axis of the open rotor and these vanes are arranged so that a screen gap is formed between the sorting vanes and the screen basket.
The upstream zone is followed by a second zone provided with baffle means.
The residence time of the suspension in the first zone is increased by the baffle means, which helps separation and thickening of the impurities

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