Importance

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Abstract

A vortex cleaner for separating fibre-liquid-suspensions, and in particular paper-pulp suspensions, into fractions, comprises an elongate vortex chamber (1) of circular cross-section, which over a part (3) of its length tapers towards its one end. At the wider end of the chamber there is provided a substantially tangentially directed inlet (4) for the suspension to be treated, and an axially directed outlet (6) for a lighter fraction of the treated suspension. At the narrower end of the chamber there is provided a second, axially directed outlet (7) for a heavier fraction of the treated suspension. The chamber is provided, within its narrowing part (3), with a plurality of baffles (9) which project radially into the chamber from the inner surface of the chamber wall, and which are inclined relative to the axial direction of the chamber substantially in concordance with the helical flow of suspension fed through the tangential inlet (7) and passing nearest the chamber wall towards the narrower end of the chamber. These baffles are mutually spaced apart when seen in both the axial and peripheral direction, in a manner such that the upstream end of a given baffle is located at a peripheral and/or axial distance from and downstream of the downstream end of the immediately preceding baffle. In this way, the baffles ensure that the heavier fraction is discharged through the reject outlet (7) at the narrower end of the chamber, so as to obviate the risk of the vortex cleaner being blocked, without impairing the fractionating process in the vortex cleaner at the same time.

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First Claim