WO2011069703A2 - Disperger iii - Google Patents

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 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 only over one part of the area between the base of the tooth (14) and the tip of the tooth (10).

Description

 Disperger III

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 fiber and between the rows of teeth there are annular spaces 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 only over a part of the distance between tooth base and tooth tip.

As radially extending grooves are understood that at least one Directional component perpendicular to the circumferential direction of the treatment tool.

 The pulp suspension flows through the gap between the

Treatment tools usually from the inside out. As the treatment tools move relative to each other, the radially extending grooves, especially because they only extend over part of the distance between

Tooth base and tooth head run, additional working edges, what the

Dispersion, in particular dirt-spot comminution,

Improved ink separation and sticky crushing.

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 the teeth of the disperser at least one, only over a part of the distance between the tooth base and the tooth head extending, radially extending groove. 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, in the case of high demands, it can be advantageous if a part of the teeth, preferably all teeth, have a plurality of radially extending grooves extending only over a part of the distance between tooth base and tooth head.

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

It is usually sufficient if several, preferably all tooth flanks only each have a radially extending groove. To maximize the number of additional working edges, it may be advantageous if several, preferably all tooth flanks each have a plurality of radially extending grooves.

 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 of a tooth flank offset radially one behind the other and / or radially to each other

are arranged. In the interests of a uniform effect of the grooves should have several, preferably all radially extending grooves in the radial direction of the same depth.

However, it can be advantageous, in particular, in the production or specific designs of the treatment tool, if the depth of a plurality of, preferably all, radially extending grooves changes in the radial 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.

This, in turn, makes it possible to simplify the production of the grooves, that the depth of the radially extending grooves increases in the direction of the tooth root, wherein the groove base preferably extends approximately perpendicular to the radial direction.

Regardless of the design of the radial groove, it may be advantageous that at least one radial groove on the tooth base or at least one radial groove on the tooth tip ends.

 However, it can also be advantageous to create an effective working edge if all the radial grooves of the tooth flanks terminate in front of the tooth tip or tooth root.

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

Tooth flank remains constant or preferably enlarged.

On the other hand, it may also be advantageous if the radial grooves are formed by holes in the tooth flank. It is not necessary that the bore up towards the end to the respective tooth flank is open.

Furthermore, it may be advantageous if at least one radially extending groove is located on the tooth tip or in the base of the tooth.

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.

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-c: different tooth cross-sections in the radial direction;

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

FIGS. 5a-c: further tooth cross sections in the radial direction;

Figures 6a + b: the two views according to section in Figure 5 and

Figure 7: another preferred variant.

The high-consistency paper pulp 1 is pressed according to Figure 1 directly into the central region of the Dispergergarnitur, 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 heated by heating steam before. 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 one another, the gap between them also changes, as a result of which 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, of the fibrous material. 1 flowed through radially outwards.

 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 FIGS. 2 to 7, the truncated pyramid-shaped teeth 6 have grooves 8, 9, 15, 16 extending radially and partially also in the circumferential direction 7. These grooves 8,9, 15, 16 form additional working edges, which improves the dispersion.

According to FIG. 2, all or, for example, only every second radially inner or outer tooth flank 1 1 can have one or more in the circumferential direction 7

have extending grooves 8. The circumferential groove 8 can also be located on the tooth head 10. In addition, the teeth 6 also each have a centrally in the radially inner and outer tooth flanks 1 1 of the rows of teeth 5 from the tooth base 14 to the tooth head 10 radially extending groove. 9

 Significant for the invention are the radial grooves 9 which extend only over part of the distance between the tooth base 14 and the tooth tip 10 and which can occur alone or in combination with other radial grooves 15, 16 and / or circumferential grooves 8.

 With a minimum tooth width of about 4 mm, the width of the radial grooves 9, 15, 16 should be approximately between 1, 5 and 2.5 mm.

In the teeth 6 shown in Figures 3 to 7, the depth of the radial groove 9 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 to the tooth base 14 increases continuously. In this way, the casting of the treatment tool 3.4 considerably simplified, with a slight inclination of the groove bottom 13 with respect to the perpendicular to the tooth base 14, for example, 4 °, should be included.

The radial grooves 9 of the tooth flanks 1 1 but also as in the figures 5c and 6b of holes in the tooth flank 1 1 are formed, which extend approximately perpendicular to the radial direction or the plane of rotation of the treatment tool 3.4. These holes can end in the tooth flank 1 1 and form cavities there. Holes are particularly advantageous if the teeth have a low height and / or are relatively wide.

The teeth 6 shown in FIGS. 3 each have a maximum of only one radial groove 9 on a tooth flank 11.

 While the radial groove 9 of both tooth flanks 1 1 ends at the tooth 6 according to FIG. 3 a at the tooth tip 10, this runs according to FIG. 3 b to the tooth root 14.

 In FIG. 3 c, only one tooth flank 1 1 of the tooth 6 has a radial groove 9, which, however, is objected to by the tooth head 10 and the tooth base 14.

In addition, runs on the tooth tip 10 of this tooth 6, a circumferential groove. 8

In the side views of the teeth 6 shown in Figure 4a and b according to the section in Figure 3 it can be seen that between the adjacent teeth 6 in the circumferential direction 7 from the tooth base 14 outgoing elevations 17, so-called hills, extend, which ensure that the paper pulp 1 is pressed from the tooth base 14 directly into the next passing tooth gap. In contrast, FIGS. 5 a to c show different teeth 6 whose tooth flanks 1 1 have a plurality of radial grooves 9 arranged radially one behind the other. As in FIG. 3, the radial grooves 9 in FIGS. 5 a and b each have a groove base 13 extending approximately perpendicular to the radial direction or the plane of rotation of the treatment tool 3,4.

In this case, the width of the radial grooves 9 in the direction of the tooth flank 1 1 increases slightly, which facilitates the casting of the grooves 9.

The radial grooves 9 a tooth flank 1 1 can be sequentially strung together as in Figure 5 a and b, so that there is a step-shaped course.

In FIG. 5 a, the first radial groove 9 of a tooth flank 1 1 on the tooth head 10 begins while the last radial groove 9 ends before the tooth base 14.

In contrast, the last radial groove 9 of the tooth flanks 1 1 extends in Figure 5b to To the tooth base 14. In addition, the tooth 6 shown in Figure 5b has a radially extending groove 15 in the tooth head 10th

The tooth 6 shown in FIG. 5 c likewise has a radial groove 15 in the tooth head 10, although, as mentioned, the radial grooves 9 of the tooth flanks 11 are formed by bores.

Furthermore, between the teeth 6 of Figures 5 b and c is a radial

running groove 16 in the tooth base 14 realized.

FIGS. 6 show the corresponding side views according to the section in FIG. 5.

 The variant shown in Figure 7 preferably has only one, namely the counter to the flow direction of the pulp suspension 1 facing tooth flank 1 1 from the tooth base 14 and the tooth head 10 offensive radial groove 9. Bei

However, a radial groove 9 can also be introduced in the case of the other tooth flank 11.

 In addition, the tooth head 10 still has a radially extending groove 15, which merges into the radial groove 9 of the tooth flank 1 1.

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  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 only over part of the distance between the tooth base (14) and Tooth head (10) extends. 2. Dispergiervorrichtung according to claim 1, characterized in that the predominant part, preferably all teeth (6) at least one row of teeth (5) at least one, only over a part of the distance between the tooth base (14) and the tooth head (10) extending radially have extending groove (9). 3. Dispersing device according to claim 1 or 2, characterized in that the predominant part of the teeth (6), preferably all teeth (6) at least one treatment tool (3,4) at least one, only over a part of the distance between the tooth base (14 ) and the tooth head (10) extending radially extending groove (9) have. 4. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the majority of the teeth (6), preferably all the teeth (6) at least one, only over part of the distance between Tooth base (14) and the tooth head (10) extending radially extending groove (9) have. 5. Dispergiervorrichtung 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. Dispergiervorrichtung 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 (9). 7. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the radially inner and outer tooth flank (1 1) of a tooth (6) have at least one radially extending groove (9). 8. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the opposite tooth flanks (1 1) of adjacent rows of teeth (5) have at least one radially extending groove (9). 9. dispersing device according to one of the preceding claims, characterized in that a plurality, preferably all tooth flanks (1 1) only each have a radially extending groove (9). 10. Dispergiervorrichtung according to any one of the preceding claims, characterized in that a plurality, preferably all tooth flanks (1 1) each have a plurality of radially extending grooves (9). 1 1 .Dispergiervorrichtung according to claim 10, characterized in that the radially extending grooves (9) of a tooth flank (1 1) are arranged radially behind one another. 12. Dispersing device according to claim 10, characterized in that the radially extending grooves (9) of a tooth flank (1 1) are arranged radially offset from one another. 13. Dispergiervorrichtung according to any one of the preceding claims, characterized in that a plurality, preferably all radially extending grooves (9) in the radial direction have the same depth. 14. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the depth of a plurality, preferably all radially extending grooves (9) changes in the radial direction. 15. Dispersing device according to one of the preceding claims, characterized in that the radial cross section of the teeth (6)  is formed truncated pyramid. 16. dispersing device according to claim 14 and 15, characterized in that the depth of the radially extending grooves (9) towards the tooth base (14) increases. 17. Dispersing device according to claim 16, characterized in that the groove base (13) extends approximately perpendicular to the radial direction. 18. Dispergiervorrichtung according to any one of the preceding claims, characterized in that at least one radial groove (9) ends at the tooth base (14). 19.Dispegiervorrichtung according to any one of the preceding claims, characterized in that at least one radial groove (9) on the tooth head (10) ends. 20.Dispegiervorrichtung according to any one of claims 1 to 18, characterized  in that all radial grooves (9) terminate before the tooth head (10). 21 .Dispergiervorrichtung according to any one of claims, characterized in that the width of the radial grooves (9) in the direction of tooth flank (1 1) remains constant or preferably enlarged. 22. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the radial grooves (9) of holes in the tooth flank (1 1) are formed. 23. Dispergiervorrichtung according to any one of the preceding claims, characterized in that there is at least one radially extending groove (15) on the tooth head (10). 24. Dispergiervorrichtung according to any one of the preceding claims, characterized in that some teeth (6), preferably the majority of teeth (6) and in particular all the teeth (6) at least one row of teeth (5) at least one in the circumferential direction (7) extending groove ( 8) possess. 25. dispersing device according to claim 24, characterized in that in the circumferential direction (7) extending groove (8) on the tooth head (10). 26. Dispersing device according to claim 24, characterized in that in the circumferential direction (7) extending groove (8) at a radially inner or outer Tooth flank (1 1) is located. 27. Dispersing device according to one of claims 24 to 26, characterized  in that the radially extending grooves (9) are not deeper than the grooves (8) running in the circumferential direction (7). 28. Dispergiervorrichtung according to any one of the preceding claims, characterized in that the tooth base (14) has radially extending grooves (16). 29.Dispergiervorrichtung according to any one of the preceding claims, characterized in that both treatment tools (3,4) are formed by oppositely driven rotors. .Dispergiervorrichtung according to any one of claims 1 to 28, characterized in that a treatment tool (4) is formed by a drivable rotor and the second treatment tool (3) by a stationary stator.