DEVICE TO THE DISPERSION OF HIGH-CONSISTENT PULP AS WELL AS SETS FOR THIS DEVICE

The invention concerns a device for dispersion gemäß the generic term of the requirement 1.

A similar device for dispersing is for example well-known from the DE-PS 30 47 013. It serves to work on waste paper pulp intensively mechanically and thermally whereby the breakdown materials contained in it can be replaced, cut up from the fibers and/or brought under the visibility border. Differently than for example with stuff Mahlrefinern with such machines the fibrous material is worked on not in a pumpable suspension, but in form of a doughy or krümeligen high consistency material, preferably with a Trockengehalt between 20 and 35%. In this way considerably higher shearing stresses can be transferred into the fibrous material, whereby the goals mentioned are attainable, without thereby a substantial change of the Faserlänge takes place. Strengthened in many cases the effect of the mechanical treatment by heat further, e.g. by adjusting a fibrous material temperature of 90° Celsius or still over it.

By the high consistency, which the fibrous material has with the treatment, an intensive mechanical treatment is possible, although itself the teeth relatively to each other of the movable treatment tools, which so-called sets do not affect, but move by themselves together rather in a distance of approx. 0.5 mm or more with relatively high speed. It is favorable that with sets of this kind one very groß e number of teeth is involved, so that the pulp is divided by many slots (tooth spacings) into small component currents. There is easily e.g. one behind the other possible twelve for stages (tooth rows). The arrangement of the tooth rows within the dispersion range with Zahnfüß EN on one level has the special advantage that the radial river of the material is optimal in the dispersion range.

Sets of this kind are compact and have an excellent Dispergierwirkung. Usually in a dispersion device standing Statorund a moved rotor set are used. Sets can be compound from ring segments to a complete circle.

With devices of the kind treated here the distance between the sets can be changed, as the sets are moved axially against each other. This adjustment procedure permits it to vary the effect of the device in such a way that it corresponds to the requirements. It is plausible that with more closely becoming distances the transferred mechanical achievement rises. The possibility of the axial adjustment is of advantage particularly if itself by longer use of the set a certain Verschleiß adjusted, that to a Vergröß erung the distances leads. The width of the distances affects the capacity and also the mass flow of the high consistency material by the Disperger. Well-known placing behind can create remedy, it is nevertheless not possible however, with advanced Verschleiß to operate the Dispergiermaschine as optimally as with new sets. Consequently the sets must often be exchanged, although they are not yet worn.

From the DE 29 31 375 A is well-known with tooth rows of equipped Mahlrefiner for high-consistent stuff and for stückiges material such as wood chips. Used for fibers, he serves careful grinding, with which without fiber shortening the water absorption and elasticity of the fibers are to be increased. The “meal teeth” are arranged for this purpose wedge-shaped. A pretreatment with some more strongly trained teeth precedes actual grinding, their distances at the teeth profiles considerably größ it are as the appropriate in the meal zone. Such Refiner is not suitable for effective dispersing.

In the CSU 1,238,782 A of descriptive Scheibenhomogenisierer is also with a high number from axially into one another seizing teeth equipped, can however only pasty, well sliding materials and not high-consistent pulp process.

The task is appropriate for the invention to reason to improve the devices in such a way for the dispersion of high-consistent pulp that a longer life span of the sets up to the exchange is obtained, without an inadmissible degradation of the dispersion effect must be taken in purchase.

This task is solved by the characteristics specified in the characteristic of the requirement 1.

With that erfindungsgemäß it out-arranged dispersion device is considered that within the radially internal range of the sets a smaller Verschleiß appears as in radially äuß eren. This effect is to be attributed to the main thing to the fact that the peripheral speed from the inside after auß EN constantly increases, which then also to one größ eren relative velocity with one another cooperating of the sets leads. The high relative velocity essential for the dispersion effect causes a higher Verschleiß straight in the places, at those that größ Te portion of the dispersion work is carried out. Because of that erfindungsgemäß EN of characteristics exists the possibility, this Verschleiß to adjust by axial adjustment.

Possibly can due to that when new größ do not eren axial distances within the radially internal range of the sets a certain portion of or only weakly dispersed material this range happen. Because of the following radially äuß eren dispersion zone can however be accepted. When new these parts of the set disperse anyway particularly well. Altogether the set will thus serve also when new its purpose. So regarded can by those erfindungsgemäß EN Maß the sets took over a long length of time to be optimally used and used, so that a far better compromise was found here, than it was so far the case.

The invention and its advantages described on the basis of designs. Show:

Fig. 1

a part of one erfindungsgemäß EN device in cut side view;

Fig. 2

Supervision on a set;

Fig. 3 and 4

Scrap view of a set set in two different positions to each other;

Fig. 5

a detail opinion of two to each other sets standing in working position.

Fig. 1 shows a part of a dispersion device with two relatively to each other complementary sets 1, 2, in such a way with one another in interference movable in circumferential direction, that they can cooperate. They are arranged so to each other that everywhere a minimum distance between moved surfaces is kept relatively to each other; this can with advantage größ it as 1 mm its. The selected representation in form of a cut in side view shows that itself radially from the inside after auß EN the teeth 3, 4, 3 belonging to the different sets ', 4 ' etc. up to that äuß eren teeth 3 ", 4 " alternate. The Zahnfüß e stand themselves thereby to the part outweighing far on one level E1 for a set in each case a 1 and/or a E2 of the second set 2. thereby can the material flow in radially äuß eren part of the sets particularly well train and is not inclined not to getting stuck and/or caking on. Deviations from this even arrangement can be meaningful however in the direct central intake range (tooth rows with the teeth 3 and/or 4). The tooth row of a set is enough in each case into the gap of the complementary set, whereby to bestimmungsgemäß EN enterprise of the device between the teeth by complementary sets of distances to be kept must.

On the left of drawn set 2 belonged to the stator the 6 and on the right of drawn set 1 to the rotor 5. these by a wave 10 one holds and one shifts in rotation. The high-consistent pulp arrives by the inlet pipe 9 with the help of an auger 12 central into the Disperger. Such a material relatively toughly, differently than e.g. is a pumpable paper fiber suspension, as it is processed in Entstippem or Refinern. It is seized first by the centrifuge cross 11 and promoted then to the sets. The radially internal tooth row belongs to the rotor set and those radially äuß first to the stator set. The rotation axle of the rotor 5 lies here horizontally, and the radial transportation direction of the high-consistent pulp lies in senkrechten levels. The sets are accommodated in a housing 13.

The set 2 belonging to the stator 6 can be adjusted with the help of a shifter 8 in axial direction by some millimeters. As was already implemented, thereby the distance between the complementary sets 1 and 2 can be stopped according to requirements. Erfindungsgemäß the sets 1 and 2 are in such a way out-arranged that them radially inside größ ere axial distances have as radially auß EN. One recognizes here that e.g. at the internal tooth 3 between tip of a tooth and axially facing set surface a distance A exists, that significantly größ it is as the distance C, which forms at the radially last tooth 3 ''' for the set 1 to the opposite set 2. Also at the teeth profiles the axial distances b and D are drawn in, which likewise change by the adjustment procedure, if they - as here drawn - are diagonal in relation to the axial direction. Therefore here also the axial distances b are radially inside größ it as the axial distances D radially auß EN. The axial distances at the teeth profiles do not have however always gemäß these criteria arranged its. Due to the bevel is grö&szlig at the flanks anyway already; erer adjusting path up to the contact of the Gegenfläche available as at the tips of a tooth.

Fig. thus Rotorund a stator set shows 2 in supervision a Dispergergarnitursatz. One recognizes the circular gaps 14. Also the teeth 3, 3 ', 3 ", 4, 4 ', 4 " (cut drawn) are arranged in circular rows and are enough into the appropriate gaps 14 the Gegengarnitur inside. By the multiplicity of the teeth are only some represented. Between neighbouring teeth tooth spacings 7 for the flow of the fibrous material remain free. The form of the teeth depends on the intended purpose of the set. With advantage the cross section 21, which is formed by cut in radial level, is a square, in particular a rectangle. The cross sections 21 can be at the corners easily rounded, e.g. with sets, their tooth spacings 7 already with the Gieß EN to be formed. Teeth with such cross sections are generally optimal for dispersing high-consistent fibrous material.

Also in Fig. 3 shown set set consists of two sets 1 and 2, not in the interference stands here, but are to each other aligned. I.e. they can be brought by movement on the allocation lines 21 directed axially in the Disperger in interference. These sets point a concrete practical example to the realization of the invention. Like that e.g. the height of H2 of the internal tooth 3 of the set 1 is equivalent as those of the three äuß eren teeth 3 ', 3 ". The height is measured in each case over the back bearing surface 20 of the set. The radially internal tooth 3 of the set 1 is just as highly as e.g. the teeth of the three äu&szlig with this example; eren tooth rows; nevertheless the task posed can be solved, since the baseplate of the Gegengarnitur is here thinner 2. The set 2 belonging to the stator has two tooth rows with a smaller height of H3 than the four, lying radially inside, further auß EN lying tooth rows, which exhibit the smaller height of H4. How was already implemented, it concerns an example here, which those erfindungsgemäß e arrangement of the dispersion device clarifies. There is naturally one größ ere number of different possibilities, in order to co-ordinate Dispergergarnituren so that they exhibit the demanded different distances as set set.

The set set gemäß Fig. 3 is in Fig. represented, like it by direct superimposing results 4 in a situation to reach (without thereby a meaningful working position). One sees that itself that radially äuß ere part at the tips of a tooth affects, while the radially internal part at the tips of a tooth exhibits distances g.

In Fig. 5 is somewhat more in detail drawn for two sets in the interference, without revealing however all constructional characteristics. The radially internal range 17, a middle range 18 and that is shown radially äuß ere range 19. Usually sets of this kind between three and twelve tooth rows have. With the teeth 3 ' and/or 4 ', those within the middle range 17, thus between the teeth 3 and/or 4 of the internal tooth rows and the teeth 3 " and/or 4 " that äuß first tooth rows are appropriate, can for “temporary solutions” with the choice of the distances e and/or f be selected. Thereby values are meant which lie between those for the distances A, b, C and D already mentioned. Here the concretely determined Verschlei&szlig can; held back to be considered.

For the accurate centring of the set 1 belonging to the rotor a centring federation 16 is intended, however not at the Auß more endurchmesser is appropriate for this set, so that a radial projection forms there. This contains a number of axial projections/leads 15, which accelerate and would drive off the fibrous material withdrawing from the Gamitursatz. Such axial projections/leads can be from the same material as the set, e.g. without groß EN additional expenditure with to be cast on.