EP3391969B1 - Dimensionally stable ring element for a heat exchange jacket - Google Patents

Description

The present invention relates to a dimensionally stable ring element for a heat exchange jacket, a heat exchange jacket with a plurality of such ring elements, and a stirred ball mill with such a heat exchange jacket.

Agitator ball mills are used in many fields, but above all in those areas in which a ground material is to be ground especially fine, such as. in pigment processing in the paint and coatings industry. An agitating ball mill is used to crush and disperse color pigments and fillers to a very small particle size (such as nanoparticles). The milling process generates heat in the grinding container of the agitator ball mill. In order to achieve the best possible grinding result, it may be advantageous to be able to dissipate or recover excess heat or to allow a desired temperature control of the grinding process. For this reason, agitator ball mills can be provided with a heat exchange jacket, through which a heat transfer medium can flow, whereby a desired temperature control of the milling process is possible. Controlled temperature control of processes in containers may also be desirable in many other applications and is therefore not limited to grinding processes or stirred ball mills.

DE-202015101859-U1 discloses a fluid guide mat for directionally directing fluid flow in an agitated ball mill. At one of DE-2920758-B1 Known agitator ball mill, the heat exchanger shell is formed as a one-piece hollow cylindrical sleeve (eg stainless steel), which extends over the entire length of the grinding container and encloses it. The inner wall of the hollow cylindrical sleeve is provided with a groove which extends helically from one end of the sleeve to the other end of the sleeve. In the groove, a flexible partition is attached, the inner end of the grinding container is applied, so that a helically extending around the grinding container running channel is formed. Both the introduction of the helical groove as well as the attachment of the flexible partition is complex and requires costly manufacturing processes.

Since, on cooling or heating, a heat transfer medium (e.g., water) flows through the helical channel, deposits may occur over time that may be detrimental to temperature control and therefore must be removed. Also, the partition may wear out over time, so they must be replaced, otherwise the heat transfer medium no longer flows uniformly through the helical channel around the grinding container. Both the removal of such deposits as well as an exchange of the partition wall is very complex, because first the over the entire length of the grinding container extending hollow cylindrical sleeve must be completely stripped from the grinding container, which can be difficult because the deposits such stripping of Hollow cylinder difficult or even impossible, without causing the partition is damaged. An exchange of the partition wall is very complex because to the new partition laboriously over the entire course along the inner wall of the hollow cylinder helical groove must be pressed into this, which on the one hand handcraft is difficult to accomplish and on the other is associated with great expenditure of time.

Here, the invention is intended to remedy the situation and eliminate the disadvantages mentioned above.

This object is achieved by the erfindungsmäß dimensionally stable ring member for a heat exchange jacket, as defined by the features of independent claim 1. Advantageous aspects of the dimensionally stable ring element according to the invention will become apparent from the features of the corresponding dependent claims.

• eine zylindrische Hülse mit einer Zylinderachse, einem ersten Ende und einem dem ersten Ende abgewandten zweiten Ende, sowie mit einer Innenwand,
• eine Trennwand, die von der Innenwand der Hülse nach innen absteht und sich entlang der Innenwand vom ersten Ende der Hülse bis zum zweiten Ende der Hülse wendelförmig um die Zylinderachse herum erstreckt.

According to the invention, a dimensionally stable ring element for a heat exchange jacket is proposed, which comprises:

• a cylindrical sleeve having a cylinder axis, a first end and a second end facing away from the first end, and having an inner wall,
• a divider wall projecting inwardly from the inner wall of the sleeve and extending helically along the inner wall from the first end of the sleeve to the second end of the sleeve about the cylinder axis.

The sleeve comprises at its first end a parallel to the cylinder axis extending projection which is arranged in a predetermined circumferential position on the sleeve. At its second end, the sleeve comprises a recess extending parallel to the cylinder axis and having a shape complementary to the projection and being disposed in the same predetermined circumferential position on the sleeve as the projection.

The term "dimensionally stable" with respect to the ring member means that the ring element as a whole, ie considered as a whole component is not changed in a proper use of the ring member in its outer shape, so it is stable in shape. This does not mean that individual parts of the ring element can not be deformable (for example, the partition may have a flexible and thus deformable sealing lip, but it need not, see discussion below), but the ring element as a whole is in intended use of the ring element in stable in its outer form.

Such a dimensionally stable ring element allows a particularly simple assembly and disassembly of a quasi-modular heat exchange jacket, which is formed of several individual successively arranged in a row dimensionally stable ring elements, and also makes the complex replacement of the partition obsolete. By the projection and the recess a positioning aid is created during assembly. This positioning aid allows a simple, error-free, fast and correct position assembly of several such ring elements in a row in a row to one Form heat exchange jacket. In addition, the projection and the recess, since they are complementary in shape, allow a positive engagement between a plurality of such successively arranged in a row ring elements. As a result, a rotation of the individual ring elements of the heat exchanger jacket relative to each other can be prevented. In the event that the partition wall of a single ring element is damaged, needs to be replaced in the maintenance of the heat exchange jacket, only the damaged ring element, which makes the technically complex and time-consuming associated replacement of the partition obsolete. The maintenance is thus limited to the replacement of each damaged ring elements, which is possible easily and without much time.

According to one aspect of the dimensionally stable ring element according to the invention, the projection at the first end of the sleeve has a tooth with a tooth length and a tooth width, and the recess at the second end of the sleeve has a gap with a gap depth and a gap width. The tooth has a complementary shape to the gap, the tooth length corresponds to the gap depth and the tooth width of the gap width.

The tooth and the complementary gap allow a simple and reliable fit of successively arranged in a row ring elements. A possible rotation of two successively arranged in a row ring elements relative to each other is prevented in this way. The gap is dimensioned so that the tooth can be inserted into the gap during assembly and pulled out of the gap during disassembly. In addition, the combination of tooth and gap allows easy and quick recognition of the correct mounting position.

According to a further aspect of the dimensionally stable ring element according to the invention, the projection at the first end of the sleeve has a projection extending along the circumference of the sleeve, which has a projection length in the direction of the sleeve circumference and has a projection width in the direction of the cylinder axis. The recess at the second end of the sleeve comprises a recess extending in the direction of the sleeve circumference, which has a recess length in the direction of the sleeve circumference and a recess depth in the direction of the cylinder axis. The supernatant has a complementary shape to the recess, and the protrusion length corresponds to the recess length and the protrusion width of the recess depth.

The protrusion extending along the sleeve circumference and the recess complementary in shape and likewise extending along the circumference of the sleeve also enable a torsion-proof positive connection of ring elements arranged one behind the other in a row and also determine the positionally correct arrangement of the individual ring elements relative to one another.

According to a further aspect of the dimensionally stable ring element according to the invention, the partition wall extends from the projection at the first end of the sleeve to the recess at the second end of the sleeve helically around the cylinder axis, wherein the partition has a parallel to the cylinder axis extending partition wall width, which is smaller or equal is like the overhang width.

A partition width predetermined in this way relative to the projection width (or correspondingly to the recess depth) makes it possible for the dividing wall of a ring element to abut congruently with its partition wall beginning at the dividing wall end against the recess of a ring element arranged immediately adjacent in the row, so that a quasi-spiral, Continuously continuous partition is formed.

According to a further aspect of the dimensionally stable annular element according to the invention, the dividing wall has a flexible sealing lip on its end facing away from the inner wall of the sleeve.

When mounting the ring member or the heat exchanger sheath of several such ring elements, the flexible sealing lip can create the container wall of the process container or grinding container, whereby an optimal sealing effect is achieved.

According to a further aspect of the dimensionally stable annular element according to the invention, the sleeve is made of a first material having a first modulus of elasticity and the partition of a second material having a second modulus of elasticity, wherein the first modulus of elasticity of the material of the sleeve is greater than the second modulus of elasticity of the material of the partition ,

This makes it possible that during assembly, the partition can be bent and thus firmly abut the process container or grinding container, while the sleeve and thus the ring element considered as a whole remains stable in its outer shape. For example, the first material from which the sleeve is made may be polyamide or fiber reinforced polyamide. The second material from which the partition wall is made may be, for example, a thermoplastic elastomer. Both the first material, from which the sleeve is made, and the second material, from which the partition wall is made, are for example injection-moldable materials.

Thus, according to a further aspect of the dimensionally stable ring element according to the invention, the sleeve of the first material with the dividing wall of the second material is produced by a two-component injection molding process. A partition wall produced in this way has a contour adapted to the contour of the container wall of the process container or grinding container.

Due to the production by injection molding, the contact surface of the partition, which comes into contact with the container wall of the process container or grinding container, wrinkle-free, so that the heat transfer medium flows uniformly through the channel around the process container or grinding container, while it is pressed in dividing walls, as shown Known in the prior art, such a wrinkling can occur.

With the aid of a two-component injection molding process, a cost-effective, reliable and time-saving manner of producing the dimensionally stable ring element according to the invention is possible. The partition does not need to be installed in a separate step in the sleeve, but the ring member can be made using a two-component injection molding same as a complete component. Accordingly, when a replacement is required, only the ring element to be exchanged according to the invention is replaced by a new ring element, which is cost-effective (favorable production of the ring element, time-saving and simple replacement of a worn ring element by a new ring element). In addition, this also the time required for the exchange, during which the process container is unused, comparatively short.

According to another aspect of the dimensionally stable annular element according to the invention, the dividing wall is formed as a helically shaped, dimensionally stable bead which surrounds the cylinder axis and projects inwards from the inner wall of the sleeve. The term "dimensionally stable" in relation to the bead again means that in a proper use of the ring member of the bead does not change in shape, so is stable in shape.

A partition with such a dimensionally stable bead is robust and resistant to wear. On the other hand, the dimensionally stable bead must be prepared so that it can not rest against the container wall, but a small radial gap between the container wall and the partition wall remains. Otherwise, at the Mounting the dimensionally stable bead to be damaged (he can break, for example).

According to a further aspect of the dimensionally stable ring element according to the invention, in such a case the sleeve and the dividing wall can be made of the same material by means of a one-component injection molding process.

The one-component injection molding process is a particularly cost-effective, reliable and time-saving way of producing the dimensionally stable ring element according to the invention.

According to the invention, a heat exchange jacket is furthermore proposed, in which a plurality of dimensionally stable ring elements according to the invention, as described above, are arranged one behind the other in a row, wherein the projection of a subsequently arranged in the row ring element positively into the recess of the respective preceding in the row ring element intervenes.

In such a heat exchange jacket, the ring elements arranged one behind the other in a row can not rotate relative to one another, they are thus arranged rotationally fixed. This is achieved by a positive connection between the projection of a respective front ring element in the row and the recess of the respective subsequent rear ring element. Such a heat exchange jacket is further cost-effective to maintain, since not necessarily all ring elements of the heat exchange jacket must be replaced, but only those ring elements can be replaced, which actually require a replacement. Such a heat exchange jacket can also be installed quickly, since the partition wall of the ring elements does not have to be laboriously drawn into the heat exchange jacket, but is already integrated in the ring elements.

• einen Mahlbehälter mit einer zylindrischen Behälterwand und
• einen erfindungsgemässen Wärmetauschmantel wie vorstehend beschrieben umfasst.

As already mentioned, the application is basically conceivable for many types of process containers, but especially for agitator ball mills. According to the invention, therefore, an agitator ball mill is proposed, which

• a grinding container with a cylindrical container wall and
• a heat exchange jacket according to the invention as described above.

The heat exchange jacket is arranged around the container wall, so that a helical channel is formed by the helically extending around the cylinder axis around partitions of the ring elements of the heat exchange jacket and through the container wall.

The agitator ball mill according to the invention further comprises an inlet and an outlet for a heat transfer medium, the inlet being connected to a first end of the helical channel and the outlet being connected to a second end of the helical channel of the heat exchange jacket facing away from the first end.

Such an agitating ball mill has the advantage that it can be mounted and maintained in a simple manner. Furthermore, this agitator ball mill allows efficient temperature control of the process in the grinding container. When mounting the heat exchanger sheath can be easily attached to the grinding container by the grinding container is introduced into the heat exchanger shell of the composite and in series successively arranged ring elements or the heat exchanger sheath is pushed over the grinding container. During maintenance, the heat exchanger jacket can be disassembled in the reverse manner from the grinding container (pulling out the grinding container from the heat exchanger jacket or removing the heat exchanger jacket from the grinding container). By placing the heat exchange jacket around the container wall, optimum heat exchange between the grinding container and allows a heat transfer medium flowing through the heat exchange jacket, since the channel for guiding the heat transfer medium is formed so that the heat transfer medium comes into direct contact with the container wall of the grinding container. Depending on the application, the heat transfer medium can serve as a cooling medium or as a heating medium.

According to a further aspect of the agitator ball mill according to the invention, this further comprises a cylindrical outer shell, which encloses the heat exchange jacket.

The cylindrical outer shell makes it possible to increase the stability of the heat exchange jacket in addition, since it encloses the heat exchange jacket and thus holds the individual ring elements in addition in position. Between the heat exchange jacket and the cylindrical outer shell, there is preferably a slight radial play, which allows the ring elements of the heat exchanger sheath to be inserted into the cylindrical outer sheath and then to insert the grinding container into the heat exchanger sheath with the cylindrical outer sheath enclosing it or the heat sheath arranged in the cylindrical outer sheath to slide over the grinding container.

According to one aspect of the agitator ball mill according to the invention, this comprises a heat exchange jacket of ring elements according to the invention with a partition wall with a flexible sealing lip as described above. The flexible sealing lip has an inner edge with an inner diameter and the container wall of the grinding container an outer diameter. The inner diameter of the sealing lip is smaller than the outer diameter of the container wall of the grinding container, so that the flexible sealing lip is bent and rests against the container wall of the grinding container.

Preferably, the sealing lip is bent in a direction opposite to the flow direction of the heat transfer medium through the helical channel. Characterized the sealing lip is pressed by the heat transfer medium even more firmly against the container wall, whereby the helical channel is well sealed and thus can flow during operation, the heat transfer medium without leakage evenly through the helical channel, which in turn provides a good and uniform heat exchange between the container wall and heat transfer medium can be done.

According to another aspect of the agitator ball mill according to the invention, the latter has a heat exchange jacket of ring elements according to the invention with a partition wall with a dimensionally stable bead as described above. The dimensionally stable bead has an inner edge with an inner diameter and the container wall of the grinding container an outer diameter. The inner diameter of the bead is larger than the outer diameter of the container wall of the grinding container, so that a gap is formed between the inner edge of the bead and the container wall of the grinding container.

Due to this difference in diameter between the bead and the container wall of the grinding container, the dimensionally stable bead does not rest on the container wall of the grinding container, otherwise the bead could be damaged during assembly of the heat exchanger jacket (see discussion above). Accordingly, the heat exchange jacket can be easily removed from the grinding container during disassembly.

The assembly of the heat exchange jacket on the agitator ball mill can be carried out, for example, as follows. First, all ring elements are aligned in the same circumferential position with respect to the cylindrical outer shell and inserted in a row in a form-fitting manner in a row in the cylindrical outer shell. The projection and the recess of the respective ring element serve as positioning aids. The lead of each one rear ring element in the series engages after insertion of the ring elements in the cylindrical outer shell form-fitting manner in the recess of a respective immediately before this rear ring element arranged front ring element in the series. The successively arranged in series ring elements thus form the heat exchange jacket. Then, the grinding container in the heat exchange jacket, which is surrounded by the cylindrical outer shell, introduced, or the arranged in the cylindrical outer shell heat transfer jacket is pushed over the grinding container. This means that in the case of ring elements with a partition wall with a flexible sealing lip, the flexible sealing lip of the respective ring element is bent and abuts against the container wall of the grinding container, so that a dense helical channel is formed. In ring elements with a partition wall with a dimensionally stable bead, the bead does not touch the container wall, so that here a small radial gap between the container wall and the partition remains, but also the helical channel is formed. During maintenance, the grinding container is pulled out of the heat exchange jacket or the heat exchange jacket arranged in the cylindrical outer envelope is removed from the grinding container. Subsequently, the ring elements of the heat exchange jacket are taken from the outer shell of the agitator ball mill and the worn ring elements are replaced by appropriate new ring elements (or in principle all ring elements are replaced during maintenance). The reassembly then takes place as already described.

Fig. 1

einen Längsschnitt durch eine erfindungsgemässe Rührwerkskugelmühle mit einem erfindungsgemässen Wärmetauschmantel mit erfindungsgemässen formstabilen Ringelementen;

Fig. 2

eine perspektivische Ansicht eines ersten Ausführungsbeispiels eines erfindungsgemässen formstabilen Ringelements;

Fig. 3

eine Seitenansicht des formstabilen Ringelements aus Fig. 2;

Fig. 4

einen Längsschnitt durch das formstabile Ringelement aus Fig. 2;

Fig. 5

den Ausschnitt V aus Fig. 4 in einer vergrösserten Ansicht;

Fig. 6

eine perspektivische Ansicht des Wärmetauschmantels mit einer zylindrischen Aussenhülle;

Fig. 7

einen Längsschnitt des Wärmetauschmantels mit der zylindrischen Aussenhülle aus Fig. 6 auf einem Mahlbehälter;

Fig. 8

den Ausschnitt VIII aus Fig. 7 in einer vergrösserten Ansicht;

Fig. 9

einen Längsschnitt durch ein zweites Ausführungsbeispiel des erfindungsgemässen formstabilen Ringelements;

Fig. 10

eine Seitenansicht des zweiten Ausführungsbeispiels des erfindungsgemässen formstabilen Ringelements, und

Fig. 11

einen Längsschnitt eines Wärmetauschmantels des zweiten Ausführungsbeispiels des erfindungsgemässen formstabilen Ringelements auf einem Mahlbehälter.

In the following the invention will be described in more detail with reference to the attached drawings by means of embodiments. They show, partly in schematic representation:

Fig. 1

a longitudinal section through an inventive agitator ball mill with a heat exchange jacket according to the invention with dimensionally stable ring elements according to the invention;

Fig. 2

a perspective view of a first embodiment of a dimensionally stable ring element according to the invention;

Fig. 3

a side view of the dimensionally stable ring member Fig. 2 ;

Fig. 4

a longitudinal section through the dimensionally stable ring element Fig. 2 ;

Fig. 5

the section V off Fig. 4 in an enlarged view;

Fig. 6

a perspective view of the heat exchange jacket with a cylindrical outer shell;

Fig. 7

a longitudinal section of the heat exchange jacket with the cylindrical outer shell Fig. 6 on a grinding container;

Fig. 8

the neckline VIII Fig. 7 in an enlarged view;

Fig. 9

a longitudinal section through a second embodiment of the inventive dimensionally stable ring member;

Fig. 10

a side view of the second embodiment of the inventive dimensionally stable annular element, and

Fig. 11

a longitudinal section of a heat exchange jacket of the second embodiment of the inventive dimensionally stable annular element on a grinding container.

The following definition applies to the following description: If reference signs have been given in a figure for the purpose of clarity of drawing, but are not mentioned in the directly related part of the description, their explanation will be given in the preceding or following description directed. Conversely, less relevant reference numerals are not included in all figures to avoid overcharging graphic for the immediate understanding. For this purpose, reference is made to the other figures.

Like from the Fig. 1 it can be seen, an embodiment of an agitator ball mill 4 according to the invention comprises a grinding container 5, in which an agitator for grinding the ground material is arranged. The agitator can be connected via a belt drive with a motor driving the agitator. The grinding container has a Mahlguteingang for grinding material to be ground and a Mahlgutausgang for the ground millbase. The agitator ball mill 4 also comprises a heat exchange jacket 3, which is arranged around a cylindrical container wall 50 of the grinding container 5 around. The heat exchange jacket 3 comprises a plurality of dimensionally stable ring elements 1 (see Fig. 2-5 ), or a plurality of dimensionally stable ring elements 2 (see FIGS. 9 and 10 ), which in the direction of a cylinder axis 102 (see, eg Fig. 3 ), or in the direction of a cylinder axis 202 (see, eg Fig. 10 ) are arranged one behind the other in a row. The plurality of ring elements 1, and the plurality of ring elements 2 comprehensive heat exchange jacket 3 is in the Fig. 6 to 8 and Fig. 11 and will be described in more detail below. In addition, the agitator ball mill 4 has an inlet 40 and an outlet 42 for a heat transfer medium, for example water. On the inlet 40 and the outlet 42 will be discussed in more detail below in connection with the heat exchanger shell 3.

Fig. 2 . 3, 4 and 5 Such a dimensionally stable ring element 1 comprises a cylindrical sleeve 10 with the cylinder axis 102 and a first end 104 and a second end 106 facing away from the first end 104. The dimensionally stable ring element 1 further includes a partition wall 11 projecting inwardly from an inner wall 108 of the cylindrical sleeve 10 and extending therealong the inner wall 108 extends helically about the cylinder axis 102 from the first end 104 to the second end 106. The cylindrical sleeve 10 may be made of polyamide, for example, which has a first modulus of elasticity. A good dimensional stability of the sleeve 10 can be achieved if fiber-reinforced, for example glass fiber reinforced, polyamide is selected as the material for the cylindrical sleeve 10.

The cylindrical sleeve 10 has at its first end 104 a parallel to the cylinder axis 102 extending tooth 109, which is particularly good Fig. 4 becomes apparent. Furthermore, the cylindrical sleeve 10 has at its second end 106 a parallel to the cylinder axis 102 extending and the tooth 109 complementary shape gap 113. The tooth 109 has a tooth length 112 and a tooth width 110, and the gap has a void depth 115 corresponding to the tooth length 112 and a void width 114 corresponding to the tooth width 110.

Furthermore, the cylindrical sleeve 10 at the first end 104 has a protrusion 116 extending along the circumference of the sleeve, which protrusion is in the Fig. 3 easy to recognize. Furthermore, the cylindrical sleeve 10 at its second end 106 to a projection complementary to the recess 119, which in Fig. 3 is shown in dashed lines. The projection 116 has a projection length 118 (see Fig. 2 ) in the direction of the sleeve circumference and a projection width 117 in the direction of the cylinder axis 102 (see Fig. 3 ). The recess 119 has a protrusion length 122 corresponding to the projection length 118 (see FIG Fig. 2 ) and a recess depth 120 corresponding to the projection width 117 (see FIG Fig. 3 ).

Fig. 5 shows the section V from Fig. 4 slightly enlarged, so that you better recognize the partition 11 of the dimensionally stable ring member 1. The partition 11 may extend helically about the cylinder axis 102 from the projection 116 at the first end 104 of the sleeve 10 to the recess 119 at the second end 106 of the sleeve 10. The partition wall 11 has a partition wall width 126, which is smaller than or equal to the protrusion width 117 of the protrusion 116. Furthermore, the partition wall 11 has at its end remote from the inner wall 108 of the cylindrical sleeve 10 end a flexible sealing lip 128, as well as in Fig. 8 is recognizable.

The flexible sealing lip 128 has an inner edge 130, which has an inner diameter 132 (see Fig. 4 ) defining the helically around the cylinder axis 102 running around partition wall 11. This inner diameter 132 in the embodiment shown is smaller than the outer diameter 500 of the cylindrical container wall 50 of the grinding container 5. This difference in diameter results in that when the dimensionally stable ring element 1 is arranged around the container wall 50, the flexible sealing lip 128 is bent on the container wall 50 of the grinding container 5 is present, as in Fig. 8 you can see.

The partition wall 11 may be made of a thermoplastic elastomer having a second modulus of elasticity, wherein the second elastic modulus of the thermoplastic elastomer of the partition wall 11 is smaller than the first modulus of elasticity of the polyamide of the sleeve 10. The sleeve 10 and the partition wall 11 may, for example, by Two-component injection molding process to be made.

In such a two-component injection molding process, the sleeve 10 is injected from polyamide in a first step and then the partition wall 11 is injected in a second step. In order to achieve a tight fit of the partition wall 11 in the sleeve 10, various measures can be taken. For example, the sleeve 10 may have a contact area with the partition wall 11, which forms an insoluble positive connection with the partition wall 11 after spraying the partition wall 11.

A heat exchange jacket 3 is formed by a plurality of dimensionally stable ring elements 1, which are arranged one behind the other in a row in the direction of the cylinder axis 102. This allows both a positive engagement of the tooth 109 and the supernatant 116 of a subsequently arranged in the row ring element 1 in the gap 113 and in the recess 119 of each preceding in the row ring element. 1 Fig. 6 shows such a series of interlocking dimensionally stable ring elements 1, which are inserted into an outer shell 43. For this purpose, a "window" is shown in the outer shell 43 for the purpose of better understanding, through which the engagement of the teeth is visible in the gaps of successively arranged in a row dimensionally stable ring elements 1. Fig. 6 FIG. 2 also shows that the first dimensionally stable ring element 1 introduced into the outer shell 43 engages with its tooth 109 in a precisely fitting gap present in the outer shell 43 (or in a flange of the outer shell). This engagement of the tooth 109 of the first dimensionally stable ring element 1 in the gap in the flange of the outer shell 43 allows to secure the entire series of dimensionally stable ring elements 1 against rotation.

The outer shell 43 is further screwed at its opposite ends with a first end ring 44 and a second end ring 45 (see Fig. 7 ), which at the respective end of the container wall 50 from the outside seal and thus ensure that the heat transfer medium through the inlet 40 into the one end 101 of the helical channel 100, through the helical channel 100 and through the other end 103 of the helical channel 100 flows out through the outlet 42 out again. In addition, the dimensionally stable ring elements 1 of the heat exchange jacket 3 are held together in the axial direction by the second end ring 45, so that the safeguard against rotation (engagement of the tooth in the outer shell 43 at the other end) is ensured.

FIGS. 7 and 8 show that when the heat exchange jacket 3 is arranged around the container wall 50 of the grinding container 5 around, the dimensionally stable ring elements 1 with the helically around the cylinder axis extending partitions 11 together with the container wall 50 form a helical channel 100. The helical channel 100 has a first end 101 and a second end 103 remote from the first end. The agitator ball mill 4 heat transfer medium inlet 40 is connected to the first end 101 of the helical channel 100, and the heat transfer medium outlet 42 is connected to the first second end 103 of the helical channel 100 connected. Thus, the heat transfer medium, for example, Waser, from the inlet 40 to the outlet 42 through the helical channel 100 to flow. The water is in direct contact with the container wall 50 of the grinding container 5, whereby a particularly good heat exchange (eg cooling) of the container wall 50 can be achieved. The direction of flow of the water through the helical channel 100 may be opposite to the bending direction of the flexible sealing lip 128. As a result, the flexible sealing lip 128 is pressed even more firmly against the container wall 50 by the water flowing in the opposite direction to the bending direction of the sealing lip 128 through the helical channel 100, which further enhances the tightness of the helical channel 100.

FIGS. 9, 10 and 11 shows in each case a second embodiment of the dimensionally stable ring member 2, and a heat exchange jacket 3 with dimensionally stable ring elements 2 of the second embodiment of the invention. Some of the aspects already discussed with regard to the first embodiment also apply to the second embodiment, so that these aspects and their function will not be explained again here. In this regard, reference is made to the corresponding parts of the description of the first embodiment.

In the second embodiment, the dimensionally stable ring element 2 comprises a cylindrical sleeve 20 with the cylinder axis 202 and a first end 204 and a first end facing away from the second end 206. The dimensionally stable ring member 2 comprises a (dimensionally stable) partition wall 21 which projects inwardly from an inner wall 208 of the cylindrical sleeve 20 and along the inner wall 208 from the first end 204 to the second end 206 helically extends around the cylinder axis 202 around. The cylindrical sleeve 20 may be made of polyamide, for example. In particular, the sleeve 20 and the partition wall 21 can both be molded from polyamide by means of a one-component injection molding process in a single step.

The cylindrical sleeve 20 has at its first end 204 a parallel to the cylinder axis 202 extending tooth 209. Likewise, the cylindrical sleeve 20 at its second end 206 on a parallel to the cylinder axis 202 extending and complementary to the tooth 209 gap 213. The tooth 209 has a tooth length 212 and a tooth width 210, and the gap has a gap depth 215 corresponding to the tooth length 212 and a gap width 214 corresponding to the tooth width 210.

Furthermore, the cylindrical sleeve 20 at the first end 204 comprises a projection 216 extending along the sleeve circumference. The sleeve likewise has a recess 219 complementary to the projection at the second end. The projection 216 has a protrusion length 218 (see Fig. 10 ) in the direction of the sleeve circumference and a protrusion width 217 in the direction of the cylinder axis 202. The recess 219 has a protrusion length 222 corresponding to the protrusion length 218 (see FIG Fig. 10 ) and one of the protrusion width 217 corresponding recess depth 220th

The partition wall 21 extends helically about the cylinder axis 202 from the projection 216 at the first end 204 of the sleeve 20 to the recess 219 at the second end of the sleeve 20 and has a partition wall width 226 (see FIG Fig. 9 ), which is smaller or equal to the protrusion width 217 of the supernatant 216. Furthermore, the partition wall 21 has a dimensionally stable bead 228, which projects from the inner wall 208 of the sleeve 20 inwardly.

The dimensionally stable bead 228 has an inner edge 230 with an inner diameter 232, wherein this inner diameter 232 is greater than the outer diameter 500 of the container wall 50 of the grinding container 5, so that between the inner edge 230 of the dimensionally stable bead 228 and the container wall 50 of the grinding container 5, a narrow gap is formed. The slightly larger inner diameter 232 at the inner edge 230 of the dimensionally stable bead 228 prevents the (dimensionally stable and therefore inflexible) dividing wall 21 of the cylindrical sleeve 20 from being damaged during assembly onto the grinding container 5. Although a small leakage is possible through the narrow gap formed in this way, the heat transfer medium nevertheless flows through the helical channel, similar to the first embodiment except for this slight leakage, so that the mode of operation is basically the same as in the first exemplary embodiment.

The assembly of the heat exchange jacket 3 with dimensionally stable ring elements 2 according to the second embodiment is identical to the mounting of the heat exchange jacket 3 with dimensionally stable ring elements 1 according to the first embodiment.

The invention has been explained above with the aid of exemplary embodiments. However, it is clear that the invention is not limited to these embodiments, but these embodiments are only for understanding the invention, so that changes and / or additional aspects may be provided without departing from the teachings of the invention. The scope of protection is therefore defined by the following claims.

Claims (14)

1. Dimensionally stable ring element (1, 2) for a heat exchanger casing (3), comprising:

   - a cylindrical sleeve (10, 20) having a cylinder axis (102, 202), a first end (104, 204) and a second end (106, 206) remote from the first end, and having an inner wall (108, 208),

   - a dividing wall (11, 21) which projects inwards from the inner wall (108, 208) of the sleeve (10, 20) and extends helically around the cylinder axis (102, 202) along the inner wall (108, 208) from the first end (104, 204) of the sleeve (10, 20) to the second end (106, 206) of the sleeve (10, 20),

   wherein at its first end (104, 204) the sleeve (10, 20) comprises a projection (109, 116, 209, 216) extending parallel to the cylinder axis (102, 202), which projection is arranged in a predetermined circumferential position on the sleeve (10, 20), and wherein at its second end (106, 206) the sleeve (10, 20) comprises a recess (113, 119, 213, 219) extending parallel to the cylinder axis (102, 202), which recess has a shape complementary to the projection (109, 116, 209, 216) and is arranged on the sleeve (10, 20) in the same predetermined circumferential position as the projection (109, 116, 209, 216).
2. Ring element (1, 2) according to claim 1, wherein the projection at the first end (104, 204) of the sleeve (10, 20) has a tooth (109, 209) having a tooth length (112, 212) and a tooth width (110, 210), and wherein the recess at the second end (106, 206) of the sleeve (10, 20) has a notch (113, 213) having a notch depth (115, 215) and a notch width (114, 214), the tooth (109, 209) having a shape complementary to the notch (113, 213), and the tooth length (112, 212) corresponding to the notch depth (115, 215) and the tooth width (110, 210) corresponding to the notch width (114, 214).
3. Ring element (1, 2) according to any one of claims 1 and 2, wherein the projection at the first end (104, 204) of the sleeve (10, 20) comprises an overhang (116, 216) extending along the circumference of the sleeve, which overhang has an overhang length (118, 218) in the direction of the circumference of the sleeve and an overhang width (117, 217) in the direction of the cylinder axis (102, 202), and wherein the recess at the second end (106, 206) of the sleeve (10, 20) comprises a cutaway (119, 219) extending in the direction of the circumference of the sleeve (10, 20), which cutaway has a cutaway length (122, 222) in the direction of the circumference of the sleeve and a cutaway depth (120, 220) in the direction of the cylinder axis (102, 202), the overhang (116, 216) having a shape complementary to the cutaway (119, 219), and the overhang length (118, 218) corresponding to the cutaway length (122, 222) and the overhang width (117, 217) corresponding to the cutaway depth (120, 220).
4. Ring element (1, 2) according to claim 3, wherein the dividing wall (11, 21) extends helically around the cylinder axis (102, 202) from the overhang (116, 216) at the first end (104, 204) of the sleeve (10, 20) to the cutaway (119, 219) at the second end (106, 206) of the sleeve (10, 20), and wherein the dividing wall (11, 21) has a dividing wall width (126, 226) extending parallel to the cylinder axis (102, 202), which dividing wall width is smaller than or equal to the overhang width (117, 217).
5. Ring element (1) according to any one of the preceding claims, wherein the dividing wall (11) has a flexible sealing lip (128) at its end remote from the inner wall (108) of the sleeve (10).
6. Ring element (1) according to claim 5, wherein the sleeve (10) is made from a first material having a first modulus of elasticity and the dividing wall (11) is made from a second material having a second modulus of elasticity, the first modulus of elasticity of the material of the sleeve (10) being greater than the second modulus of elasticity of the material of the dividing wall (11).
7. Ring element (1) according to claim 6, wherein the sleeve (10) made from the first material with the dividing wall (11) made from the second material is manufactured by a two-component injection-moulding process.
8. Ring element (2) according to any one of claims 1 to 4, wherein the dividing wall (21) is in the form of a dimensionally stable bead (228) running helically around the cylinder axis (202), which bead projects inwards from the inner wall (208) of the sleeve (20).
9. Ring element (2) according to claim 8, wherein the sleeve (20) and the dividing wall (21) are manufactured from the same material by a one-component injection-moulding process.
10. Heat exchanger casing having a plurality of ring elements (1, 2) according to any one of claims 1 to 9, which are arranged one after the other in a row in the direction of the cylinder axis (102, 202), wherein the projection (109, 116, 209, 216) of a ring element (1, 2) that is arranged subsequently in the row engages interlockingly in the recess (113, 119, 213, 219) of the respective preceding ring element (1, 2) in the row.
11. Agitator ball mill (4), comprising:

    - a grinding container (5) having a cylindrical container wall (50),

    - a heat exchanger casing (3) according to claim 10,
    wherein the heat exchanger casing (3) is arranged around the container wall (50), so that a helical channel (100, 200) is formed by the dividing walls (11, 21) of the ring elements (1, 2) of the heat exchanger casing (3) extending helically around the cylinder axis and by the container wall (50),

    - an inlet (40) and an outlet (42) for a heat transfer medium, the inlet (40) being connected to a first end (101, 201) of the helical channel (100, 200) and the outlet (42) being connected to a second end (103, 203) of the helical channel (100, 200) of the heat exchanger casing (3), which second end is remote from the first end.
12. Agitator ball mill according to claim 11, further comprising a cylindrical outer cover (43) which encompasses the heat exchanger casing (3).
13. Agitator ball mill according to any one of claims 11 and 12 having a heat exchanger casing composed of ring elements (1) according to any one of claims 5 to 7, wherein the flexible sealing lip (128) has an inner edge (130) having an internal diameter (132) and the container wall (50) of the grinding container (5) has an external diameter (500), the internal diameter (132) of the sealing lip (128) being smaller than the external diameter (500) of the container wall (50) of the grinding container (5), so that the flexible sealing lip (128) is bent and rests against the container wall (50) of the grinding container (5).
14. Agitator ball mill according to any one of claims 11 and 12 having a heat exchanger casing composed of ring elements (2) according to any one of claims 8 and 9, wherein the dimensionally stable bead (228) has an inner edge (230) having an internal diameter (232) and the container wall (50) of the grinding container (5) has an external diameter (500), the internal diameter (232) of the bead (228) being larger than the external diameter (500) of the container wall (50) of the grinding container (5), so that a gap is formed between the inner edge (230) of the bead (228) and the container wall (50) of the grinding container (5).

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