Patent ID: 6068772
Filing Date: 2000-05-30
Classification: D21D

Abstract:
An apparatus for processing fiber suspensions, said fiber suspensions containing particles to be separated off from the usable fibers of the suspension, the specific weight of said particles differing distinctly from that of said usable fibers, comprising an essentially drum-shaped outer housing accommodating in the zone of its one inflow end a body which is essentially rotationally symmetrical in relation to the housing axis, said outer housing being provided with an inlet for the fiber suspension to be processed and accommodating in the zone of its other outflow end a stationary outlet pipe concentric with the housing axis for a lightweight dirt portion of the suspension containing particles to be separated off and having a specific weight less than the specific weight of said usable fibers, and said outer housing being provided with an accepted stock outlet for an accepted stock portion of the suspension containing essentially usable fibers, and further comprising a rotary drive for generating in the annular chamber between said outer housing and said rotationally symmetrical body a flow component which is rotatory in relation to the housing axis, wherein said outer housing and said accepted stock outlet are stationary, and said rotationally symmetrical body is in the form of a rotor rotationally drivable about said housing axis, wherein a separating wall rotationally symmetrical with said housing axis is provided, said separating wall forming together with a circumferential wall of said outer housing an outer annular chamber which is open at its end facing said rotor and is closed in the opposite direction, said outer annular chamber being provided at an axial distance from its open end with an outlet for a heavy dirt portion of the suspension containing particles to be separated off and having a specific weight greater than the specific weight of said usable fibers, and wherein said accepted stock outlet communicates with the outflow end of an inner annular chamber located between said separating wall and said outlet pipe for lightweight dirt.