FI85882C - RAFFINOER FOER RAFFINERING AV PAPPERSMASSOR ELLER DYLIKA. - Google Patents

Abstract

A refiner for the refining of paper pulps or the like, comprising oppositely placed refiner blades (2, 3), at least one of which rotates, an intake (11) for the pulp to be refined and an outlet (12) for the refined pulp. A drawback with conventional refiners is that the pulp fed into the refiner is not refined uniformly because there is no provision for selecting the pulp fractions to be refined. The invention solves this problem in that one or more of the refiner blades (2, 3) are provided with one or more top separators (6) which are at least partially conical and fixedly connected to the blades.

Description

85882

GRINDER FOR THE GRINDING OF PAPER PULP OR THE LIKE -RAFFINÖR FÖR RAFFINERING AV PAPPERSMASSOR ELLER DYLIKA

The present invention relates to a grinder for grinding paper pulps or the like, which grinder comprises opposing grinding blades, at least one of which is rotatable, an inlet for grinding pulp and an outlet for ground pulp.

10 The refiners can be roughly divided into two groups: disc refiners and conical refiners and are already well known, so their exact structure will not be explained in this context. A major drawback of the known refiners is that the pulp fed to the refining is unevenly ground because the refining cannot be applied to the desired fiber fractions.

The object of the present invention is to provide a refiner which does not have the above-mentioned drawback, because during the grinding-20 operation, part of the pulp mixture is separated into two different fractions, one of which is returned to the feed side and the other to the refiner outlet. The refiner according to the invention is characterized in that one or more at least partially conical vortex separators are fixedly connected to one or more refiner blades, and that the upper part of the cone of the vortex separator opens into the space between the refiner blades, whereby the speed difference between the blades pulp to the vortex separator and provides the required 30 rotational movements for the pulp in the vortex separator.

By means of the invention, e.g. the advantage that the grinding can be applied to the desired fiber fractions.

In the following, the invention will be explained in detail with reference to the accompanying drawings, in which 2 85882

Figure 1 shows a cross-section of the structural principle of a selective grinding grinder according to the invention.

Figure 2 shows a vertical section of a selective grinding cone refiner according to the invention, in which the different placement possibilities of the vortex separators are shown.

Figure 3 is a schematic and partial view of the stator and rotor blades and the vortex separators connected thereto, viewed in the axial direction of the refiner.

Figure 1 shows a selective grinding grinder 1 according to the invention, which may be a disc or cone 15 grinder, and which consists of a grinding blade 2, 3. At least one of the grinding blades is rotatable, whereby a grinding gap is formed in the small space between the respective blade grooves 4, 5 or zone 9. In the exemplary embodiment shown in Fig. 1, a fixedly conical vortex separator 6 is connected to one grinding blade 2, for example a stator blade 6. The upper part of the cone of the vortex separator opens into the space 4, 5, 9 between the grinding blades 2, 3. to the separator 6 to provide the necessary rotational movement for the mass in the vortex separator. The vortex separator may be any conventional vortex separator having at least two different fraction outlets 7, 6. In the case of Figure 1, the upper outlet 7 acts as an outlet end for the lighter fraction and the lower outlet 8 as the outlet end for the heavier fraction.

Figure 2 shows a conical grinder comprising truncated cone-shaped grinder blades 2, 3. In this case, the outer blade 2 is stationary, i.e. the stator blade, and the inner blade 3 is a rotating rotor blade whose axis of rotation 10 is mounted on the grinder body 17. The conical grinder 14, into which the pulp is fed mainly through the inlet 11, and an outlet pulp space 13, from which the ground pulp exits through the outlet 12. In Fig. 2, both the stator and rotor blades 2, 3 are provided with vortex separators 6 according to Fig. 1. As can be seen from Fig. 2, the feed opening of the vortex separator 6 can be located at a desired position 5 in the grinding zone and The outlets of the vortex separator can open inside the refiner, as is arranged in Fig. 2 in the case of the three upper vortex separators. Instead, looking at the pattern, the outlets 15, 16 of the lowest vortex-10 separator open outside the refiner.

Figure 3 shows, in the direction of the axis of rotation of the rotor, a partial and schematic view of essentially the same solution as in Figure 2. The arrow 18 indicates the direction of rotation of the rotor 3.

It will be clear to a person skilled in the art that the invention is not limited to the above-mentioned exemplary embodiments, but can be varied within the scope of the appended claim.

Claims (1)

CLAIM 4 85882 A grinder for grinding pulps or the like, 5 which comprises opposing grinding blades (2, 3), at least one of which is rotatable, a pulp inlet (11) and a pulp outlet (12), characterized in that one or more one or more at least partially conical vortex separators (6) are fixedly connected to the refining blade (2, 3), and that the upper part of the cone of the vortex separator (6) opens into the space between the refining blades (2, 3), whereby the blades (2, 3) the speed difference between it both feeds the pulp to the vortex separator (6) and provides the necessary rotational movement for the pulp in the vortex separator. 5 85882 Refiners for refining with paper pulp and parts, account for refining with refining pulp (2, 3), for use 5 refinements for rotation and intranet (11) for refining with refining and refining (12) for refining , which can be used as an account for a number of devices (2, 3), and for a number of data for a conveyor belt (6); varvid hastighetsdifferensen mellan Bladen (2, 3) Bade inmatar massan account virvelavskiljaren (6) och ästadkommer den erforderliga rotationsrörelsen för massan i virvelavskiljaren. •. .