EP2212015B1 - Rotor-stator-device for dispersing or homogenising - Google Patents

Abstract

The invention relates to a device (1) that is used to disperse or homogenise according to the flow-through principle. Said device comprises at least one tool that comprises a rotor (2) and a stator (3), expediently, several tools of said type that are arranged in an axial manner behind one another, that are arranged in a chamber (4) through which a medium that is to be treated flows. The rotor(s) is/are driven by a motor (6) via a magnetic coupling (5) and the magnetic coupling (5) comprises a stationary separating can (9) between a drive-sided, rotationally-driven drive coupling part (7) and a driven coupling part (8), such that expensive cooled shaft sealings can be avoided. The drive coupling part (7) that is on the drive side engages in a recess-shaped or hollow-shaped cylindrical driven coupling part (8) that is on the driven side and the separating can (9) is arranged between both coupling parts. As a result, the driven coupling part (8) and the separating can (9) are cooled by the medium that is to be treated.

Description

The invention relates to a device for dispersing or homogenizing in the continuous flow principle, with at least one consisting of at least two coaxial rotors each with associated stator tool which is disposed within a chamber through which the medium to be processed chamber, wherein the bearing of the rotors arranged in the chamber and the rotors are driven via a magnetic coupling, which magnetic coupling between a drive-side rotationally driven drive coupling part and a secondary output coupling part has a fixed, the chamber in the coupling region final gap shell.

In such known from practice, continuously operating devices for dispersing or homogenizing, the problem is that between the medium flowed through the chamber or the medium flowed through the working space and the drive a seal is necessary, especially at high speeds, pressures and high temperatures makes it difficult and can be very expensive.

From the EP-A-0 291 820 a device for mixing two flowable materials with rotor disks and stator disks is known, but the bearing of the rotors or rotor disks is not arranged in the chamber through which flows through the media.

From the DE 20 2006 005 189 U1 is a centrifugal pump with coaxial magnetic coupling known whose storage on the Medium side facing away from the pump impeller is arranged so that it is practically not touched by the medium and at least not flowed through.

When driven by magnetic clutches devices and devices, the problem may arise that especially at high powers, pressures and speeds, the resulting high temperatures especially in the range of bearings and in the region of the arranged between the parts of the magnetic clutch gap shell because of the eddy currents occurring there only difficult to control.

It is therefore an object to provide a device of the type mentioned or a dispersing device, wherein the problem of sealing between the drive and working chamber in a conventional manner eliminated by a magnetic coupling and yet storage is to be made possible, even under high pressures, Speeds and temperatures can work satisfactorily.

This object is achieved with the means and features of claim 1.

It is particularly favorable for the transmission of the drive power when the drive coupling part is cylindrical and the output coupling part to fit hollow cylindrical.

In this way it can be achieved that the bearing of this medium itself lubricated and cooled by the promotion of the medium during its processing, so that even high pressures, speeds and temperatures can be handled. You can achieve greater performance than with only one rotor and stator.

It is important that the bearings are arranged in the flow area of the medium, so that they are exposed directly to this medium and cooled accordingly. An expedient and advantageous embodiment of the invention may be that at least one groove or the like indentation for conveying medium to be dispersed through the bearing is provided on at least one of the relatively movable bearing parts. By this measure, the lubrication and cooling of the bearing or be further promoted.

For a precise storage and in particular high speeds, it is advantageous if both sides of at least one rotor in each case a bearing or sliding bearing is provided. Thus, such a rotor is not flying, but stored correspondingly precise on both sides, which allows narrower gap between rotor and stator and thus a better dispersing or homogenizing effect.

It may be particularly favorable for a high performance when the shaft engaging the drive coupling part supports two bearings and two rotors therebetween, as well as a third rotor, which faces away from the coupling and projects beyond the second bearing. So there are only two camps to provide and cool and yet there may be three rotors with their stators. Correspondingly effective can be to disperse or homogenize a medium in the course, wherein the coaxial arrangement of the plurality of rotors inevitably results in a corresponding flow direction of the medium through the chamber or through the working space and thereby to the corresponding bearings.

A further advantageous and advantageous embodiment of the invention may provide that the output coupling part has at least one passage or more passages to the containment shell and at least one outlet to an outlet opening of the chamber or the working space. As a result, it is possible that the medium also acts on or flows around the containment shell before it reaches the exit from the chamber or the working space, so that the containment pot can also be cooled by the medium.

It is important, especially in fast-running dispersing machines and the associated high eddy currents in metallic containment pans their good cooling.

In this case, the outlet on the output coupling part may be the opening on the free edge of this output coupling part, into which opening the containment shell engages. Thus results as an outlet, an annular gap on the gap pot facing the end or edge of the output coupling part.

By conveying the medium with the aid of the rotors processing it through the chamber or the working space, virtually any orientation of this working space, for example a horizontal arrangement, is possible.

However, a modified embodiment may provide that the rotor shaft facing upward above the drive and the Magnetic coupling is arranged and the inlet is provided through an inlet opening in the chamber or the working space above the top rotor in this arrangement. This results in a downward path for the medium to be processed, which can also be vertical, for example. This is particularly favorable for the cooling effect on the split pot, because this can then be acted upon intensively by the processed medium.

In order for the device to be especially suitable for high temperatures without the need for using unsuitable or very expensive or complicated rolling bearings, it is expedient if the bearings have slide bearings, in particular ceramic bearings, e.g. made of silicon carbide, wherein the bearing sleeve, which rotates in each case with the shaft, is arranged on a metal stub located between it and the shaft, which over a part of the bearing width has an inner diameter somewhat enlarged relative to the shaft and / or at least one extending in the axial direction or obliquely thereto Slit whose width is in particular greater than the expected thermal expansion. Thus, thermal expansion and thereby different thermal expansion coefficients can be compensated, since the different inner diameter and / or slot allow different thermal expansion of the actually cooperating parts, so that, for example, an inner steel stub part does not break up a ceramic bearing sleeve. Advantageously, therefore, ceramic bearing sleeves can be used, which have a high temperature and wear resistance.

The rotors and the bearing sleeves can be coaxially arranged side by side and / or touching each other on the drive shaft and clamped together in the axial direction by a compressive force. This results in easy installation and allows one practically with respect to their diameter continuous drive shaft, on which on the one hand the rotors and on the other hand, the bearing sleeves can be arranged coaxially side by side. It is possible that the bearing sleeves have on one of their end faces a stop and a bevel or rounding, which has the stop in negative form, so that the axial pressing of the bearing sleeve to the stop can also result in a radial fixation and centering.

The particular existing ceramic bearing bushing of the respective sliding bearing can be arranged in a metallic holder which recedes when heated due to its greater thermal expansion coefficient of the bearing bush to the outside, and on the outside of the bearing bush, a slotted or multiply divided outer ring may be provided by means of Spring force or springs is pressed against the bearing bush. Thus, also for the bearing bush with different thermal expansion in each expansion phase, a good radial fixation or the outside resilient against spring or restoring forces holder can compensate for the different thermal expansion of the bearing bush.

For the axial clamping of the rotors and the bearings on the free end of the shaft facing away from the magnetic coupling, an expansion screw engaging in it can be provided, which engages over an expansion sleeve which is supported on the parts lined up on the shaft. Thus, a strain of the expansion screw can cause the desired compressive force in the axial direction of the strung on the shaft parts. The use of an expansion screw can take into account from the outset that this bias even at high temperatures and should be maintained appropriate thermal expansion.

The transport of the medium through the chamber or the working space can be facilitated by the fact that the holders of the bearing have openings or are formed from single webs. Correspondingly well, the medium can also be conveyed through these supports of the camp.

Especially when combining one or more of the above-described features and measures results in a device for dispersing or homogenizing, which allows high performance, because high temperatures can be considered without the sealing of the working space consuming, optionally cooled shaft seals, for example in the form of Mechanical seals, requires.

Fig.1

eine teilweise im Längsschnitt gehaltene erfindungsgemäße Vorrichtung zum Dispergieren oder Homogenisieren mit einem Antriebsmotor und einer von dem Medium durchströmten Kammer, in welcher aus Rotor und Stator bestehende Werkzeuge angeordnet sind, wobei zwischen dem Antrieb und den Werkzeugen eine Magnetkupplung vorgesehen ist, sowie

Fig.2 in

vergrößertem Maßstab einen Längsschnitt der erfindungsgemäßen Vorrichtung ohne den zugehörigen Antriebsmotor.

Eine

im Ganzen mit 1 bezeichnete Vorrichtung dient zum

An embodiment of the invention will be described in more detail below with reference to the drawing. It shows in part in a schematic representation:

Fig.1

a device according to the invention, partly held in longitudinal section, for dispersing or homogenizing with a drive motor and a chamber through which the medium flows, in which tools consisting of rotor and stator are arranged, wherein a magnetic coupling is provided between the drive and the tools;

2 in

enlarged scale a longitudinal section of the device according to the invention without the associated drive motor.

A

as a whole with 1 designated device is used for

Dispersing or homogenizing in a continuous flow principle and is also referred to below as a dispersing device 1. For the machining of a medium, it has a total of three tools consisting of rotor 2 and stator 3, which are arranged within a chamber 4 through which the medium to be processed, also referred to below as "working space 4", is located.

The still to be described storage of the rotors 2 is disposed in the chamber 4 and the rotors 2 are driven by a designated as a whole with 5 magnetic coupling by the drive motor 6. The magnetic coupling 5 has between a drive-side rotationally driven drive coupling part 7 and a driven coupling part 8 a fixed, the chamber 4 in the coupling region hermetically sealed containment shell 9, so that with the disperser 1, even at high temperature and high pressures, a high performance can be achieved without specially cooled shaft seals, eg Mechanical seals, to provide.

Especially in FIG. 2 it can be seen that the drive-side drive coupling part 7 engages as a magnetic carrier in the recessed or hollow output-side output coupling part 8 and disposed between the two coupling parts of the split pot 9. The recessed or hollow output coupling part 8 is thus facing the chamber 4 or is located in this, so it can be acted upon and cooled by the medium to be processed.

This outer output coupling part 8 is connected to a drive shaft 10 located in the chamber 4 for the rotors 2 and also the bearings 11 for the rotors 2 carried by the drive shaft 10 are adjacent to the rotors 2 within the chamber 4 through which the medium flows arranged, are thus flows around and cooled by the medium to be processed.

One recognizes especially in FIG. 2 in that the drive coupling part 7 is cylindrical and the output coupling part 8 is hollow cylindrical in shape, so that the drive coupling part 7 can engage in the output coupling part 8, but as mentioned, between these two coupling parts the containment shell 9 ensures a hermetic separation and sealing.

If one considers the inlet opening 12 and the outlet opening 13 of the chamber 4, it becomes clear that the bearings 11 are arranged in the flow area of the medium within the chamber 4, that is, acted upon by the medium and cooled accordingly by the transport of the medium through the chamber 4 can, so that correspondingly high speeds are possible. In a manner not shown may be provided at least one groove or the like indentation for conveying medium to be dispersed through the respective bearing 11 at the respective bearings 11 on at least one of the relatively movable bearing parts, which improves the lubricating and cooling effect.

In the exemplary embodiment, it is provided that the arranged on the output coupling member 8 or associated shaft 10 has two bearings 11 and between these two bearings 11 two rotors 2 and on its side facing away from the coupling 5, over the second bearing 11 projecting end cantilevered a third rotor 2 carries. Overall, therefore, the dispersing device 1 contains three rotors 2 with associated stators 3, the two of which are mounted on both sides, so that only the foremost in the flow direction, the inlet opening 12 nearest rotor 2 is cantilevered. The storage conditions are correspondingly precise and the gaps between rotors 2 and stators 3 can be correspondingly narrow.

In the drawings, it can be seen that the output coupling part 8 has at least one passage 14 or several such passages 14 to the containment shell 9 and at least one outlet 15 to the output port 13 of the chamber 4 or the working space, so that the split pot 9 despite the him largely enclosing output coupling part 8 can be acted upon by the medium and cooled.

The outlet 15 from the output coupling part 8 is the opening at the free edge 16 of this output coupling part 8, in which opening the containment shell 9 and in the interior of which the drive coupling part 7 engage. Thus, with the device 1 running, the medium introduced into the output coupling part 8 can be distributed well and evenly to the gap pot 9 and cool it.

In the exemplary embodiment, the rotor shaft 10 is arranged horizontally, but it could also be arranged facing upwards or vertically above the drive 6 and the magnetic coupling 5, so that the inlet opening 12 into the chamber 4 or the Working space above the rotors 2 would be provided. This is possible because of the good hermetic sealing of the chamber 4 by means of the split pot 9, so that the transport of the medium through the device 1 are supported by gravity and the chamber 4 can be better emptied, as they can easily idle, which is the case Cleaning and processing of products that cure on cooling is beneficial.

In FIG. 2 It is shown that the respectively co-rotating with the shaft 10 bearing sleeve 17 of the respective bearing 11 is disposed on a between her and the shaft 10 metal nozzle 18, over a part of the bearing width with respect to the shaft 10 slightly larger inner diameter or according to the embodiment a extending in the axial direction slot 19 whose dimension is in particular greater than the expected thermal expansion. Thus, the different thermal expansion coefficients on the one hand, the bearing sleeve 17 and on the other hand, the shaft 10 can be compensated.

Furthermore one recognizes in FIG. 2 in that the rotors 2 and the bearing sleeves 17 of the bearings 11 are arranged coaxially next to each other on the drive shaft 10 and clamped together in the axial direction in a manner to be described by a compressive force, so that a simple assembly results. The likewise made of ceramic, stationary, cooperating with the bearing sleeve 17 bearing bush 20 of the respective slide bearing 11 is disposed in a metallic holder 21 which can shrink when heated due to its larger thermal expansion coefficient of the bearing bush 20 radially outward. One recognizes especially in FIG. 2 on the outside of the bearing bush 20 a slotted or repeatedly divided outer ring 22 which is pressed by spring force of springs 23 to the bearing bush 20 and thus between the holder 21 and the bearing bush 20 is located. In this way, different thermal expansion coefficients and high temperatures can be compensated at this point.

For the already mentioned axial tension of the rotors 2 and the bearings 11 and their bearing sleeves 17 is provided at the magnetic coupling 5 facing away from the free end of the shaft 10 in this axially engaging expansion screw 24, with its external thread into an internal thread in the shaft 10th engages and with its outer head 25 an expansion sleeve 26 axially overlaps, which is supported on the lined up on the shaft 10 parts, so the rotors 2 and the bearings. In FIG. 2 It can be seen clearly how these compressible in the axial direction expansion sleeve 26 is overlapped by the head 25 of the expansion screw 24 and allows a tension of the parts, which remains even with thermal expansion due to the use of a correspondingly biased expansion screw 24.

It should be noted that the holders 21 of the bearings 11 have openings 27 through which the medium can be conveyed from the inlet opening 12 to the outlet opening 13. Concentric to the working space or to the chamber 4 can still be seen a heating chamber 28, with which the temperature in the chamber 4 can be influenced.

The device 1 is used for dispersing or homogenizing in a continuous flow principle and has at least one of rotor 2 and stator 3 existing tool, expediently several such tools axially one behind the other, in one of the to be processed medium through-flow chamber 4 are arranged. The one or more rotors 2 are driven by a motor 6 via a magnetic coupling 5, wherein the magnetic coupling 5 between a drive-side rotationally driven drive coupling part 7 and a driven coupling part 8 has a fixed containment shell 9, so that complex cooled shaft seals can be avoided. The drive-side drive coupling part 7 engages in the recessed or hollow, expediently cylindrical output-side output coupling part 8 and between two coupling parts is the containment shell 9. Thus, the output coupling part 8 and the containment shell 9 can be cooled by the medium to be processed.

Claims (14)

1. Apparatus (1) for dispersion or homogenisation by the throughflow principle, having at least one tool consisting of at least two coaxially mounted rotors (2) each with an associated stator (3), which is arranged inside a chamber (4) through which the medium to be processed flows, the mounting for the rotors (2) being arranged in the chamber (4) and the rotors (2) being driven by means of a magnetic coupling (5), the magnetic coupling (5) comprising a fixed separating can (9) that closes off the chamber (4) in the coupling region, between a rotationally driven driving coupling part (7) on the drive side and a driven coupling part (8), characterised in that the driving coupling part (7) on the drive side engages as a magnet carrier in the recessed or hollow driven coupling part (8) on the power take-off side, the separating can (9) is arranged between the two coupling parts, the outer driven coupling part (8) carries, or is connected to, the drive shaft (10) for the rotors (2) that is located in the chamber (4), and the bearings (11) for the rotors (2) carried by the drive shaft (10) are arranged inside the chamber (4) through which the medium flows, adjacent to the rotors (2), one of the rotors (2) being overhung or both rotors (2) being arranged between at least two bearings (11).
2. Apparatus according to claim 1, characterised in that the driving coupling part (7) is cylindrical in construction and the driven coupling part (8) is of a mating hollow cylindrical construction.
3. Apparatus according to claim 1 or 2, characterised in that the bearing(s) is or are arranged in the flow region of the medium.
4. Apparatus according to one of claims 1 to 3, characterised in that on at least one of the bearing parts that are movable relative to one another is provided at least one groove or similar indentation for conveying medium that is to be dispersed through the bearing (11).
5. Apparatus according to one of claims 1 to 4, characterised in that a bearing (11) or friction bearing is provided on both sides of at least one rotor (2).
6. Apparatus according to one of claims 1 to 5, characterised in that the shaft (10) arranged on the driven coupling part (8) comprises two bearings (11) and between them two rotors (2) and on their end remote from the coupling (5) and projecting over the second bearing a third, overhung, rotor (2).
7. Apparatus according to one of claims 1 to 6, characterised in that the driven coupling part (8) has at least one passage (14) or a plurality of passages to the separating can (9) and at least one outlet (15) to the exit opening (13) of the chamber (4) or of the working chamber.
8. Apparatus according to one of claims 1 to 7, characterised in that the outlet (15) is on the driven coupling part (8), the opening of which is on the free edge (16) of this driven coupling part (8), the separating can (9) engaging in said opening.
9. Apparatus according to one of claims 1 to 8, characterised in that the rotor shaft (10) is arranged facing upwards above the drive and the magnetic coupling (5) and the entry opening (12) into the chamber (14) or the working chamber is provided above the rotor (2) which is uppermost in this arrangement.
10. Apparatus according to one of claims 1 to 9, characterised in that the bearings are friction bearings, the bearing sleeve (17) that co-rotates with the shaft (10) being arranged on a metal connector (18) located between itself and the shaft (10), said metal connector (18) having over part of the width of the bearing an internal diameter that is somewhat greater than that of the shaft and/or at least one slot (19) that extends axially or diagonally thereto, the width of which is, more particularly, greater than the expected thermal expansion.
11. Apparatus according to one of claims 1 to 10, characterised in that the rotors (2) and the bearing sleeves (17) are arranged coaxially adjacent to one another on the drive shaft (10) and are jointly braced in the axial direction by a compressive force.
12. Apparatus according to one of claims 1 to 11, characterised in that the stationary bearing bushing (20) of the friction bearing (11), which is made particularly of ceramics, is arranged in a metallic holder (21) which when heated moves outwardly away from the bearing bushing, as a result of its greater thermal expansion coefficient, and in that, on the outside of the bearing bushing (20), is provided an outer ring that is slotted or divided into several sections which is pressed against the bearing bushing (20) by spring force or springs (23).
13. Apparatus according to one of claims 1 to 12, characterised in that for the axial bracing of the rotors (2) and the bearings (11) on the free end of the shaft (10) remote from the magnetic coupling (5) an expansion screw (24) engaging in said shaft (10) is provided which engages over an expansion sleeve (26) that rests on the parts that are lined up on the shaft (10).
14. Apparatus according to one of claims 1 to 13, characterised in that the holders (21) of the bearings (11) have openings (27) or are formed from individual strips.

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