EP0692311B1 - Continuously operating centrifugal strainer for sugar massecuites - Google Patents

Description

The invention relates to a continuously operating centrifuge for the extraction of Sugar filling masses, with a conically widening sieve basket that has a vertical The axis rotates and has a throwing edge from which the sugar particles are thrown outwards and caught there in a processing facility and on to be edited.

Such centrifuges are for example from DE 22 07 663 C3, DE 25 50 496 A1, DE 90 04 952 U1 or EP 0 487 780 B1. The sugar filling mass will first entered in the central area of the centrifuge and then by means of a Distributor pot or otherwise in the narrower, inner area of the strainer basket guided, thereby to a peripheral speed in the distributor or in an acceleration bell accelerated and then thrown outwards.

The particles then hit in the narrower, inner, usually lower area of the conically widening strainer basket and slowly "wander" this inner wall up to the discharge edge. If you have achieved this, you will flung outwards.

There are three forms of variation in the prior art. Generate the centrifuges either dry sugar, dissolved sugar or mashed sugar operated either as dissolving, mashing or dry centrifuges. In the former case the separated and cleaned sugar crystals are again in different ways dissolved. In the second case, a mashing process is additionally activated in which the crystals are retained, but the syrup shell surrounding them is dissolved and is ultimately exchanged for a purer syrup cover. In the third case, the dry sugar crystals discharged downwards and via a transport device promoted.

The three modes of operation each require different centrifuges and it is not without restrictions, a centrifuge designed for one of these purposes for the others. This means limited flexibility for the user and for the centrifuge manufacturer disadvantages with a stockpile.

It has therefore already been proposed, for example in DE 90 04 952 U1 or also DE 29 10 625 A1, two centrifuges - approximately one operated as a mashing centrifuge and the second as a disintegration centrifuge - to be arranged one above the other, in order to Available unit and available to save space. This is beneficial, but costly.

In contrast, the object of the invention is a continuously operating centrifuge to propose to throw off sugar filling masses for several applications suitable is.

This object is achieved in that the further treatment device preferably one Removable collecting channel with at least one outlet nozzle on the bottom has and that there is a removable and in the area of the outlet re-attachable overflow nozzle.

Due to the special design of the collecting channel, the use of the invention Centrifuge possible as a mashing as well as a dissolving centrifuge, too use as a dry centrifuge is part of the application.

For use as a dissolving centrifuge, the drain of the collecting channel is put on of the overflow nozzle blocked. The dissolution medium, that is water and / or thin juice, and the sugar crystals already formed are collected and solved. The clarification sump becomes in the collecting channel through the overflow connection educated. This creates a time to redeem. Not resolved Crystals sink to the bottom of the collecting channel.

The increased liquid level over the overflow nozzle then flows over the Overflow nozzle in the outlet nozzle and can be collected there.

It is still possible to adjust the level by using different heights of the overflow nozzle regulate the sewage sump. The overflow nozzle is preferably infinitely adjustable or overflow nozzles of different heights can be used.

The disintegration centrifuge known from DE 25 50 496 A1 also captures the first centrifuged sugar crystals, but not in a collecting channel. As a mash centrifuge it wouldn't be useful because the viscous magma immediately clogged everything would.

If the centrifuge according to the invention is to work as a mash centrifuge, the Overflow nozzle removed. In contrast to a clarifier, it flows off very slowly Affection magma is then derived directly without the risk of constipation consists. The mashing medium is preferably an external one Ring line placed on a baffle, the wall facing away from the strainer of the collecting channel or forms from this. Spreads on the baffle like this a layer of the mash medium into which the spun off sugar crystals are immersed.

The further processing device preferably surrounds the sieve basket in a ring. Thereby is an even further treatment of the sugar crystals in all applications guaranteed.

It is also preferably provided that a feed device, in particular a Ring line that feeds the dissolving medium in the area of the discharge edge of the sieve basket. This ring line runs at a relatively short distance above the discharge edge and sprays or guides the dissolving medium in another way Sugar crystals too. The rotating drum of the strainer basket will Dissolving medium strongly swirled and together with the sugar crystals tangentially from Sieve basket away and over the collecting channel against a baffle behind thrown. The turbulence favors the already during this flight phase Dissolving effect and the even distribution of sugar crystals and dissolving medium. The sugar crystals and dissolving medium then slide down from the baffle during the operation with dissolving medium and sugar crystals dissolved in it filled collecting channel. In this channel dissolve during the static residence time the sugar crystals continue and the clarifier then flows over the overflow nozzle into the Outlet connection.

It is possible to make the collecting channel ring-shaped as a continuous channel around the To let the strainer run around. However, it is preferred if the further treatment device has a plurality of collecting channels, each having at least one bottom-side Have outlet spouts, with overflow spouts in the area of the outlet spouts are attachable. This enables more targeted access and more precise quantities Recordings of the respective products.

It is particularly preferred if there are inclined surfaces between every two collecting channels are arranged, which slip on them lying particles in the neighboring Ensure reception camp.

If there are several operating options, this is due to the fact that they form above the further treatment device stray particles. It should also be borne in mind that the thrown off Sugar crystals with the adhering syrup residues are not radial, but tangential are thrown out and also have appropriate movement components.

It is conceivable for the plurality of collecting channels to follow one another in the circumferential direction to group around the strainer. However, it is particularly preferred if the ring-shaped further processing device surrounding the strainer in a constant Distance from the screen basket axis has a sawtooth-like profile, the outlet connections are arranged at the lowest points.

The result of this is that the collecting channels are each basin-like from the inside of the strainer basket seen lying next to each other, each at the same distance from the screen basket axis, and separated from each other by inclined surfaces or connected to each other via these are.

The catchment channels and the sloping ones between them are then on the outside Areas (these are located below the drop edge of the screen basket, too at its highest points) closed by a baffle.

In the following, an embodiment of the invention will be described in detail with reference to the drawing described.

Fig. 1

einen schematischen Schnitt durch eine erfindungsgemäße Zentrifuge;

Fig. 2

eine Draufsicht auf eine Zentrifuge mit Weiterbehandlungseinrichtung;

Fig. 3

einen Schnitt durch den Bereich des Auffangkanales;

Fig. 4

schematisch einen Schnitt mit der Funktion einer Einmaischzentrifuge;

Fig. 5

schematisch einen Schnitt mit der Funktion einer Auflösezentrifuge,

Fig. 6

einen vergrößerten Ausschnitt aus Figur 4 mit einem Prallkonus;

Fig. 7

einen vergrößerten Ausschnitt aus Figur 5 mit einem Prallkonus;

Fig. 8

schematisch eine Montageeinheit für den Prallkonus.

Show it:

Fig. 1

a schematic section through a centrifuge according to the invention;

Fig. 2

a plan view of a centrifuge with further processing device;

Fig. 3

a section through the area of the collecting channel;

Fig. 4

schematically shows a section with the function of a mash centrifuge;

Fig. 5

schematically a section with the function of a dissolving centrifuge,

Fig. 6

an enlarged section of Figure 4 with an impact cone;

Fig. 7

an enlarged section of Figure 5 with an impact cone;

Fig. 8

schematically an assembly unit for the impact cone.

The centrifuge shown has a fixed frame 10 with a base 11, side walls 12, a cover 13 above the actual screen basket 20 and a filling funnel 14. The sugar filling mass falls through the filling funnel 14 and a likewise stationary shaft 15 into the distribution pot 30.

The screen basket 20, the distributor pot 30 and a product distributor 40 rotate around a common one vertical axis 16.

The sugar filling masses given in the hopper 14 are through the distributor pot 30 and the product distributor 40 promoted and thereby on the peripheral speed of the Product distributor accelerated.

Finally, they strive towards the discharge edge of the lowest element of the product distributor 40 and are thrown out from there, where they hit the bottom of the Hit the baffle of the strainer basket 20 which widens conically upwards. From there they come to a firmly connected to the basket bottom and this baffle 21 Sieve and move upwards due to the centrifugal force on the sieve.

The sieve basket 20 is closed at the top by a discharge rim 22, which together the sieve basket rotates at a known speed. From the discharge edge 22 the sugar particles are thrown outwards and in a further treatment facility 60 collected and further processed.

A ring line 66 is located above the discharge edge 22. This ring line sprays dissolving medium in the area just below it, from which the sugar crystals are thrown outwards. The ring line is stationary and rotates not with the drop margin 22; through the rotating drum and the moving sugar crystals however, the solvent medium is swirled and mixed with the sugar crystals. Together with them, the dissolving medium is thrown out, namely through the treatment device 60 against a collecting channel 61 a preferably removable baffle 64, the wall of the sieve basket Collecting channel 61 rises upwards from this. Then slide off the baffle 64 Dissolving medium, especially water and / or thin juice, together with it again partially dissolved sugar crystals into the collecting channel 61. Has already been in this Dissolution medium collected with sugar crystals. The collecting channel 61 has one Drain connector 62, but this is in the example shown (see. Fig. 3) by a Overflow nozzle 63 blocked. So, as a sewage sump, liquid builds up until it reached the edge of the overflow nozzle 63 and then over this edge into the overflow nozzle can run in and from there down into the drain port 62.

This further treatment device 60 surrounds the screen basket 20 in an annular manner (see FIG. 2). It can be seen that several basin-like collecting channels 61 are provided together form the annular treatment device 60. Every single one of the Collection channels 61 are approximately the same size and have the same distance from the screen basket axis. At its lowest point is the drain pipe 62. On one Side protrudes from the collecting channel on a boundary wall 67 on the other side a significantly less steep, but sufficiently sloping surface, the in the direction of the adjacent collecting channel 61 and there with the latter towering steep flank 67 is connected.

The sloping surfaces make it possible for those coming to lie on them to slide Particles in the collecting channels, but at the same time they increase the average length of stay of particles in this area.

A steam line 68 runs in the bottom area of the collecting channel 61 Steam are led into the clarification sump to further improve the solution. The Steam line 68 can be dismantled in order to use the centrifuge as a mashing centrifuge to prevent clogging and crusting.

This representation describes the use of the centrifuge according to the invention as Dissolving centrifuge.

If it is to be used as a mashing centrifuge, the overflow nozzle (s) will be used 63 removed. In addition, the supply of dissolving medium through the ring line 65 stopped.

Instead, mash medium is fed through a second ring line 66. This second, outer ring line concentrically surrounds the strainer basket 20 and the other ring line 65; it runs approximately above the baffle 64 and releases mash medium. On the baffle 64, which is now inclined downwards outwards,
In this way, a layer of the mash medium spreads out, into which the sugar crystals thrown off the throwing edge 22 and this time not loaded with dissolving medium strike and immerse. Immersion results in an even distribution of the sugar crystals, and at the same time a movement relative to the mash medium. The mashing medium also prevents the sugar crystals from bursting, which would be very undesirable in this mode of operation.

With the mashing medium, the sugar crystals slowly slide in accordingly Direction of the outlet nozzle 62 of the collecting channel 61 in the further treatment device 60. The affection magma thus formed, which flows off very slowly, flows without Formation of a sump through the outlet nozzle (s) 62.

The reduced speed of the movement process is due to the sloping surface further favored between the collecting channels 61. Slides off the baffle 64 the mash medium together with the sugar crystals embedded in it statistically to a large extent not directly in the collecting channel 61, but initially on the inclined surface 69 and only slowly on this in the direction of the outlet connection 62.

It should be emphasized again that the two preferred ring lines 65 and 66 a very have different effects and each with one of the two possible uses Dissolving centrifuge or mashing centrifuge are used and at their deliver very different media depending on the intended use.

In this very simple way, the same centrifuge is used once for mashing and once for dissolving; the additionally to be provided Components (a second ring line, a special profile for a further processing facility and various overflow nozzles) are of no importance.

The further treatment device 60 with the collecting channel 61 as the core is as a structural unit manufactured and easy to assemble or disassemble. You can in the rack 10 -a standard housing- hung and between the housing flange and the Cover 13 are attached. It can be removed at any time if the centrifuge be used neither as a mashing nor as a dissolving centrifuge, but dry To carry out sugar. It arises from it without major modifications Centrifuge a third type of centrifuge with a completely different field of application.

The preferred embodiment of the centrifuge is also equipped with a variable baffle cone 70 for further optimization of the baffle surface 64 which adapts it even better to the different requirements. For this purpose, the basic physical idea is shown schematically in FIG. 4 and FIG. 5:
Since in a mashing centrifuge the sugar crystals or particles P are to be transferred into the mash from their horizontal movement after being centrifuged relatively gently, it is advantageous if a cone is provided radially circumferentially above the collecting channel for deflecting downwards by 90 ° or approximately 90 ° whose slope is directed inwards, i.e. would have its virtual cone tip above the centrifuge (FIG. 4).

The opposite is intended for a dissolving centrifuge. Here are the sugar crystals yes dissolved and destroyed. Surprisingly, one can support this Concept are made available: Figure 5 shows an impact cone 70 with virtual Cone tip below the centrifuge. On the sloping surface Impacting particles P are deflected upwards and slide against the slope gravity upwards, then slide back down and hit it but frontally against the next impinging particle P, so that there is a constant Mixing with other abruptly decelerated particles P results until they enter the collecting channels 61 fall.

These opposing elements can be achieved by simple conversion : The impact cone 70 is simply removed and installed the other way round. The assembly is carried out by two loose pipe sections 71, 72, which fit out obliquely cut the same tube, taking into account the slope of the impact cone 70. The latter contains holes which run horizontally when installed; a screw 73 is through the two pipe sections 71, 72 and the bore of the intermediate baffle cone 70 inserted and horizontally in the outer wall of the Collecting channel 61 or the side wall 12 of the frame 10 anchored.

By exchanging the pipe sections 71, 72 from the outside in and turning the Impact cone 70 is adapted to the dissolving centrifuge or mashing centrifuge.

Claims (14)

1. A continuously operating centrifuge for separating out sugar massecuite, with a perforated basket (20) which widens conically, rotates about a vertical axis (16) and has an ejection edge (22) from which the sugar particles are flung outwardly and are then collected in a further processing device (60) and undergo additional treatment, characterized in that the further processing device (60) has a collecting channel (61) with at least one discharge nozzle (62) at the base, and an overflow nozzle (63) which can be removed and re-attached is provided in the region of the discharge nozzle (62).
2. A centrifuge according to Claim 1, characterized in that the further processing device (60) surrounds the perforated basket (20) annularly.
3. A centrifuge according to Claim 1 or 2, characterized in that the further processing device has a plurality of collecting channels (61) each having at least one discharge nozzle (62) at the base thereof, wherein removable and re-attachable overflow nozzles (63) are provided in the region of the discharge nozzles (62).
4. A centrifuge according to Claim 3, characterized in that oblique surfaces are arranged between each two adjacent collecting channels (61) and ensure that particles coming to rest thereon will slide into the adjacent collecting channel (61).
5. A centrifuge according to Claim 4, characterized in that the further processing device (60) annularly surrounding the perforated basket has a serrated profile when seen in section at a constant distance from the axis of the perforated basket, and the respective discharge nozzles (62) are arranged at the deepest points of the said profile.
6. A centrifuge according to one of the preceding Claims, characterized in that on the side of the collecting channels (61) remote from the perforated basket, the further processing device (60) has a preferably removable rebounding wall (64) and a supply device for a magmatizing medium, which device delivers the said medium to the rebounding wall (64).
7. A centrifuge according to one of the preceding Claims, characterized in that a supply device (66) for a dissolving medium is provided in the region of the ejection edge (22).
8. A centrifuge according to one of Claims 6 or 7, characterized in that the supply devices (65, 66) have ring conduits.
9. A centrifuge according to one of the preceding Claims, characterized in that a steam conduit is arranged in the collecting channel (61) adjacent to the discharge nozzles (62).
10. A centrifuge according to one of the preceding Claims, characterized in that the overflow nozzles (63) are verticially adjustable or interchangeable in various dimensions.
11. A centrifuge according to one of the preceding Claims, characterized in that the further processing device (60) is provided as a separately attachable constructional unit, and is suspended in the housing (10) in a removable manner.
12. A centrifuge according to one of the preceding Claims, characterized in that a rebounding cone portion (64) is provided above the collecting channel (61) to divert the arriving particles (P).
13. A centrifuge according to Claim 12, characterized in that the rebounding cone portion (64) is removable and can be installed so that its pitch is inverted.
14. A centrifuge according to Claim 13, characterized in that the rebounding cone portion (64) can be installed with inverted pitch by means of pipe portions (71, 72) which can be attached at both sides.

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