WO2011069704A2

WO2011069704A2 - Disperger iv

Info

Publication number: WO2011069704A2
Application number: PCT/EP2010/064899
Authority: WO
Inventors: Oliver Lüdtke; Roland Rauch; Werner Brettscneider; Bernd Kraft
Original assignee: Voith Patent Gmbh
Priority date: 2009-12-08
Filing date: 2010-10-06
Publication date: 2011-06-16
Also published as: DE212010000171U1; DE102009047659A1; AT12916U1; WO2011069704A3; CN203080348U

Abstract

The invention relates to a disperging device for disperging fibrous material (1), comprising a housing (2), in which a first treatment tool (3) and a second treatment tool (4) are arranged. The treatment tools (3,4) respectively have a rotationally symmetrical form, are arranged coaxially in relation to each other, have teeth (6) which are arranged in several annular-shaped rows (5) which are concentric to the centre thereof, between which tooth gaps are located, are radially traversed by the fibrous material (1), and annular-shaped intermediate chambers are disposed between the rows of teeth (5) and arranged such that at least one row of teeth (5) of a treatment tool (3,4) extends into an annular-shaped intermediate chamber of the other, complementary treatment tool (4, 3). Disperging is therefor improved by the fact that at least some teeth (6) of at least one treatment tool (3,4) have at least one radially extending groove (9) which extends at least over the tip of the tooth (10).

Description

Disperger IV

The invention relates to a dispersing device for dispersing pulp with a housing, in which a first treatment tool and a second treatment tool is arranged, wherein the treatment tools each have a rotationally symmetrical shape, are arranged coaxially to each other, each arranged in a plurality of annular, concentric to their center rows Teeth between which there are tooth gaps, which are flowed through radially by the fibrous material and annular spaces are present between the rows of teeth, which are arranged so that at least one row of teeth of a treatment tool extends into an annular space of the other, complementary treatment tool.

Devices of the above-mentioned Art be z. B. used to improve the quality of pulp, which was obtained from waste paper. It is known that paper pulp can be homogenized by dispersing and thereby significantly improved. In many cases, a pulp is used which has a dry content of between 15 and 35% and has been brought to a temperature which is far above the ambient temperature. It makes sense, the heating then

if the pulp already has its consistency required for dispersion.

However, often the result of the dispersion is not satisfactory.

In addition, the treatment tools wear out relatively quickly. The object of the invention is therefore to improve the dispersion with the least possible wear of the treatment tools.

According to the invention, this object is achieved in that at least some teeth of at least one treatment tool have at least one radially extending groove which extends at least partially over the tooth tip.

As radially extending grooves are understood that at least with a directional component perpendicular to the circumferential direction of the treatment tool run.

The pulp suspension flows through the gap between the

Treatment tools usually from the inside out. While the treatment tools move relative to each other, the radially extending grooves, in particular because they extend at least over the tooth head, additional working edges, which improves the dispersion, in particular the Schmutzpunktzerkleinerung, the ink separation and the Stickyzerkleinerung.

In this way, the energy consumption and wear can be significantly reduced.

To obtain this effect as comprehensively as possible, the vast majority, preferably all teeth of at least one row of teeth, preferably one

Treatment tool and in particular all teeth of the disperser at least one, at least partially over the tooth head extending, radially extending groove possess.

In many cases, it is sufficient for this purpose if a part of the teeth, preferably all teeth only have a radially extending groove.

However, high demands can be made to create as many as possible

Working edges be advantageous if a part of the teeth, preferably all the teeth have a plurality of radially extending grooves.

It is advantageous if the radially inner and outer tooth flank of a tooth and / or the opposite tooth flanks of adjacent tooth rows have at least one, in particular only over a part of the distance between the tooth base and the tooth head extending radially extending groove.

The area of the tooth head is particularly sensitive, because there the layer thickness of the pulp suspension is usually higher than in the region of the tooth flanks.

Because of the high wear, the radial groove in the tooth tip should be as deep as possible. Therefore, it is advantageous if the maximum depth of the radial groove in the tooth tip between 4 and 12 mm, preferably between 5 and 8 mm.

Often it is sufficient if the radial groove extends at least for a part of the teeth, preferably for all teeth only over the tooth tip.

However, to counteract clogging of the radial groove, the radial groove should extend beyond at least a portion of the teeth, preferably all teeth beyond the tooth tip. It is advantageous if the radial groove on both sides, i. extends into the region of the radially inner and outer tooth flank.

In addition, the wear can be reduced and the flow of material can be improved if the groove bottom of the radial groove in the region of the tooth head is convexly curved.

If the teeth are wide enough in the circumferential direction, a plurality of radial grooves in the circumferential direction can be arranged side by side.

However, it may also be advantageous if the radially extending grooves are arranged radially one behind the other and / or radially offset from each other.

For the effectiveness of the radial grooves, but also in the production, in particular during casting, it is advantageous if the width of the radial grooves in the direction

Tooth surface remains constant or preferably enlarged.

Furthermore, it may be advantageous if at least one radially extending groove is located in the tooth base. As a counter surface for the tooth head of the tooth base is particularly important, especially for the creation of counter-working edges.

To extend the operating time, it is also advantageous if some teeth, preferably the majority of teeth and in particular all teeth of at least one row of teeth, preferably at least one treatment tool and

In particular, all teeth of the disperser have at least one groove running in the circumferential direction. According to the requirements, it may be sufficient if a part of the teeth, preferably all teeth have only one groove running in the circumferential direction. However, it may also be necessary for a portion of the teeth, preferably all teeth, to have a plurality of circumferentially extending grooves.

In this case, the groove extending in the circumferential direction can be located on the tooth tip and / or on a radially inner or outer tooth flank.

Again, it may be advantageous if the radially inner and outer tooth flank of a tooth or the opposite tooth flanks of adjacent rows of teeth have at least one groove extending in the circumferential direction.

So that the pulp is not accelerated too much in the circumferential direction, the radially extending grooves should not be deeper than the grooves extending in the circumferential direction.

Since most treatment tools are cast, it is advantageous if the radial cross section of the teeth is formed in the shape of a truncated pyramid.

Depending on the requirements and the nature of the

Pulp suspension both treatment tools can be formed by oppositely driven rotors. In most cases, however, a treatment tool is formed by a drivable rotor and the second treatment tool by a stationary stator. The invention will be explained in more detail below with reference to several exemplary embodiments. In the attached drawing show:

FIG. 1 shows a schematic cross section through a dispersing device;

FIG. 2 shows a plan view of a treatment tool 3;

FIGS. 3a + b: different tooth cross sections in the radial direction;

Figures 4a + b: the two views according to the section in Figure 3;

FIGS. 5a + b: further tooth cross sections in the radial direction;

Figures 6a + b: the two views according to section in Figure 5. According to FIG. 1, the highly consistent paper pulp 1 is pressed directly into the central area of the disperser set, which is formed by the two treatment tools 3, 4.

While a treatment tool 3 is stationary and thus designed as a stator, the other treatment tool 4 is rotatably mounted in the housing 2 of the disperser.

The Dispergergarnitur with the stator and the rotor is thus fed radially inward. As is well known, dispersion is effected by moving teeth 6 relatively close together relatively close together and subjecting the fibrous material 1 therebetween to strong shear forces.

For this purpose, the pulp 1 can be previously heated by superheated steam. After dispersion, the dispersed pulp 1 falls down through the outlet 12.

As a result, when the axial position of the stator and the rotor is changed relative to each other, the gap between them also changes, whereby the performance of the disperser can be controlled in a manner known per se. The treatment tools 3,4 each have a rotationally symmetrical shape. In this case, the coaxially arranged treatment tools 3,4 each have in a plurality of annular, concentric to their center rows 5 arranged teeth 6, between which there are tooth gaps, which are flowed through by the pulp 1 radially outward.

Between the rows of teeth 5 annular spaces are provided, which are arranged so that at least one row of teeth 5 of a treatment tool 3,4 in an annular space of the other, complementary

Treatment Tool 4.3 extends. As shown in Figures 2 to 6, have the truncated pyramidal teeth 6 radially extending grooves 8,9,15. These grooves 8,9,15 form additional

Working edges, which improves the dispersion. Essential for the invention are the radial grooves 9 that extend at least over the tooth tip 10 and that can occur alone or in combination with other radial grooves 8, 15 and / or circumferential grooves.

With a minimum tooth width of approximately 4 mm, the width of the radial grooves 8, 9, 15 should be approximately between 1, 5 and 2.5 mm.

Even just because of the increased wear on the tooth head 10, the existing radial groove 9 should be as deep as possible. In the interest of a casting production, the maximum depth of the radial groove 9 in the tooth tip 10 should be between 4 and 12 mm, preferably between 5 and 8 mm.

To improve the material flow and thus also to reduce the

Wear the groove base 13 of the radial groove 9 in the region of the tooth head 10 is convexly curved. It may, as shown in Figure 3b and Figure 4b, already suffice if the radial groove 9 extends only over the tooth tip 10.

In order to counteract a blockage of the radial groove 9, it is advantageous if the radial groove 9, as shown in Figure 3a and 4a, extends beyond the tooth tip 10 in the region of the radially inner and outer tooth flank 1 1 addition.

In this case, FIG. 3a indicates the possibility of extending the radial groove 9 of the tooth head 10 to different degrees into the tooth flank 11. For example, a longer extent may be opposite to the direction of flow, i. at the radially inner

Tooth flank 1 1 be advantageous. In general, over the groove extension of the flow can be more or less promoted, and it is also important whether this is a stator or a rotor.

Furthermore, a radially extending groove 15 in the tooth base 14 is realized between the teeth 6 of FIGS. 3 to 6, which creates counter-working edges opposite the tooth head 10 of the other treatment tool 3. 4.

It can also be seen in FIGS. 3 to 6 that there is a difference between the adjacent teeth 6 extend in the circumferential direction 7 outgoing from the tooth base 14 elevations 16, which positively affect the strength of the teeth 6.

The teeth 6 shown in Figures 5 and 6 each have one or more separate, radially extending grooves 8 in the region of the tooth flanks 1 1 to form further working edges. In this case, the depth of the radial groove 8 of the tooth flanks 1 1 changes in the longitudinal direction.

Because of the truncated pyramidal cross section of the teeth 6, this can be achieved simply by the fact that the groove bottom 13 extends approximately perpendicular to the tooth base 14, so that the depth increases continuously towards the tooth base 14. In this way, the casting of the treatment tool 3.4 considerably simplified.

In FIGS. 5a and 6a, the radially inner and outer tooth flanks 11 of the tooth 6 each have a radial groove 8 which, however, is spaced from the tooth tip 10 and the tooth base 14.

In contrast, have the tooth flanks 1 1 of the teeth 6 in Figure 5b and 6b, two radial radially arranged one behind the other radial grooves. 8

Again, the radial grooves 8 each have an approximately perpendicular to the radial direction or the plane of rotation of the treatment tool 3.4 groove bottom 13th

In this case, the width of the radial grooves 8 in the direction of the tooth flank 1 1 increases slightly, which facilitates the casting of the grooves 8.

The juxtaposition of the radial grooves 8 of the tooth flanks 1 1 results in a step-shaped course.

Claims

claims

1 . Dispersing apparatus for dispersing pulp (1) with a housing (2) in which a first treatment tool (3) and a second treatment tool (3) are provided

Treatment tool (4) is arranged, wherein the treatment tools (3,4) each have a rotationally symmetrical shape, are arranged coaxially to each other, in each case in a plurality of annular, concentric to their center rows (5) arranged teeth (6), between which tooth gaps are radially through which the fibrous material (1) and between the rows of teeth (5) annular spaces are provided, which are arranged so that at least one row of teeth (5) of a treatment tool (3,4) in an annular space of the other, complementary

A treatment tool (4,3) extends, characterized in that at least some teeth (6) of at least one treatment tool (3,4) have at least one radially extending groove (9) which extends at least over the tooth head (10).

2. Dispergiervorrichtung according to claim 1, characterized in that the majority of the teeth (6), preferably all the teeth (6) at least one row of teeth (5) at least one, at least over the tooth head (10).

have extending, radially extending groove (9).

3. Dispergiervorrichtung according to claim 1 or 2, characterized in that the vast majority of the teeth (6), preferably all the teeth (6) at least one treatment tool (3,4) at least one, at least over the tooth tip (10) extending radially have extending groove (9).

4. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the majority of the teeth (6), preferably all the teeth (6) of the disperser at least one, at least over the tooth head (10) extending radially extending groove (9) have ,

5. Dispergiervornchtung according to any one of the preceding claims, characterized in that a part of the teeth (6), preferably all the teeth (6) have only one radially extending groove (9).

6. Dispergiervornchtung according to any one of the preceding claims, characterized in that the maximum depth of the radial groove (9) in the tooth head (10) between 4 and 12 mm, preferably between 5 and 8 mm.

7. Dispergiervornchtung according to any one of the preceding claims, characterized in that the radial groove (9) extends at least in a part of the teeth (6), preferably in all teeth (6) only over the tooth head (10).

8. Dispergiervornchtung according to any one of the preceding claims, characterized in that the radial groove (9) extends at least in a part of the teeth (6), preferably in all teeth (6) beyond the tooth head (10) addition.

9. Dispergiervornchtung according to claim 8, characterized in that the radial groove (9) in the region of the radially inner and outer tooth flank (1 1) extends.

10. Dispergiervornchtung according to any one of the preceding claims, characterized in that the groove base (13) of the radial groove (9) in the region of the tooth head (10) is convexly curved.

1 1 .Dispergiervornchtung according to any one of the preceding claims, characterized in that a part of the teeth (6), preferably all the teeth (6) have a plurality of radially extending grooves (8,9).

12. Dispergiervornchtung according to any one of the preceding claims, characterized in that the tooth base (14) has radially extending grooves (15).

13. Dispergiervornchtung according to any one of the preceding claims, characterized in that some teeth (6), preferably the majority of the teeth (6) and in particular all teeth (6) of at least one row of teeth (5) have at least one groove running in the circumferential direction (7).

14.Dispergiervorrichtung according to claim 13, characterized in that in the circumferential direction (7) extending groove on the tooth head (10).

15. Dispergiervorrichtung according to claim 13, characterized in that in the circumferential direction (7) extending groove on a radially inner or outer tooth flank (1 1).

16. Dispersing device according to one of claims 13 to 15, characterized

characterized in that the radially extending grooves (9) are not deeper than the grooves extending in the circumferential direction (7).

17. dispersing device according to one of the preceding claims, characterized in that the radial cross section of the teeth (6)

is formed truncated pyramid.

18.Dispergiervorrichtung according to any one of the preceding claims, characterized in that both treatment tools (3,4) are formed by oppositely driven rotors.

19.Dispergiervorrichtung according to any one of claims 1 to 17, characterized

characterized in that a treatment tool (4) by a drivable

Rotor and the second treatment tool (3) is formed by a fixed stator.