US 5,257,698 AGranted

Cleaner for stock suspensions

AssigneeSulzer-Escher Wyss GmbH

InventorsAlfred Christ, Herbert Holik, Erich Linck, Wolfgang Siewert

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Abstract

Pump-like inlet blading has operatively connected therewith a multi-stage stepped diffusor axially opening into a separation chamber. For the removal of light particles, openings or recesses are provided at the outlet side of an inner cylinder and such merge with withdrawal channels at the inner cylinder. If necessary, there are provided for the heavy particles a collecting groove at least in front of turbine-like outlet blading and from which lead openings, so-called saveall openings towards the outside. These saveall openings are briefly alternatingly opened and closed during operation of the stock suspension cleaner. The fluid stream of the cleaned stock suspension is removed by the turbine-like outlet blading. At least one part of the inner cylinder which delimits the separation chamber is separately rotatable relative to the outer cylinder, so that such inner cylinder part can be rotated at a different rotational speed than the outer cylinder. The inner cylinder part carries at least one scraper which, during operation, clears the inner wall of the outer cylinder to preclude any caking thereat of heavy particle accumulations and promoting further conveyance of the heavy particles. The rotating inner cylinder part also carries a pusher ring which revolving moves in the collecting groove, pushes the heavy particles towards the saveall openings and alternately opens and closes these saveall openings.

A cleaner for stock suspensions, especially for fiber stock suspensions formed from waste paper, from which there are be eliminated particles, such as light particles or light and heavy particles, comprising:

a rotatable hollow outer cylinder;
an inner cylinder coaxially arranged for rotation within said rotatable hollow outer cylinder;
said inner cylinder having a wall surrounding an internal chamber and an outlet side;
an annular separation chamber located between the rotatable hollow outer cylinder and the inner cylinder;
the stock suspension moving in a predetermined direction of flow in substantially axial direction through said separation chamber;
pump-like inlet blade means provided for the separation chamber for the transport of the stock suspension into the separation chamber;
turbine-like outlet blade means provided for the separation chamber downstream of the pump-like inlet blade means;
a separate discharge for the light particles leading from the separation chamber;
a multi-stage stepped diffusor arranged directly downstream of the pump-like inlet blade means with respect to the predetermined direction of flow of the stock suspension;
said multi-stage stepped diffusor flow communicating with the separation chamber;
means defining discharge openings provided at an end of the inner cylinder located at the region of the outlet side of said inner cylinder;
said discharge openings serving for the removal of the light particles;
said discharge openings being located upstream of the turbine-like outlet blade means with respect to the predetermined direction of flow of the stock suspension;
said discharge openings extending through the wall of the inner cylinder into said internal chamber of said inner cylinder for the throughput of the separated light particles together with a liquid constituent;
and
the turbine-like outlet blade means being structured for receiving and transporting a main stream of cleaned stock suspension.

13 more elements

Abstract

Claims30