EP3658265A1

EP3658265A1 - Mixer

Info

Publication number: EP3658265A1
Application number: EP18746915.0A
Authority: EP
Inventors: Alexander Bublewitz; Jens-Peter Reber
Original assignee: 3lmed GmbH
Current assignee: 3lmed GmbH
Priority date: 2017-07-28
Filing date: 2018-07-26
Publication date: 2020-06-03
Also published as: CN111050893A; JP2020529317A; JP6994112B2; CA3070174C; JP2020530390A; US20210154628A1; EP3658266B1; KR102431025B1; CA3070174A1; US20200171448A1; US11986785B2; WO2019020768A1; US11717794B2; KR20200035096A; KR20200032731A; KR102513669B1; WO2019020764A1; CN111050894A; JP7100127B2; BR112019024621A2

Abstract

The invention relates to a mixer for mixing pasty components, comprising a mixing case (1) extending along a longitudinal axis (L) and having at least one inlet, preferably two inlets (7), and an outlet (8), and comprising at least one mixing element (2) received in the mixing case (1), which defines a plurality of chambers (20, 21) together with the mixing case (1), said chambers being arranged successively and/or adjacently along a flow path from the inlets (7) to the outlet (8). The chambers (20, 21) are defined by transverse walls (17), each extending perpendicularly to the longitudinal axis (L), and four side walls (13, 14, 18) that each extend parallel to the longitudinal axis (L), and adjacent chambers (20, 21) are interconnected by a flow by means of through-openings (15, 16, 19) provided in the side walls (14, 18), the mixing element (2) comprising two strips (13) forming side walls, which are connected by a web that forms other side walls and is perpendicularly arranged in relation to the strips (13), a first group of chambers (20) having first through-openings (15) arranged in the web (14), which extend up to a strip (13), and a second group of chambers (21) comprising second through-openings (16) positioned at a distance to at least one strip (13) in the web (14).

Description

mixer

The invention relates to a mixer for mixing pasty and / or flowable components. In particular, the invention relates to a static mixer, i. a mixer in which the components to be mixed are not mixed by an actively driven mixing element, but to flow past a mixing element and are mixed in this case.

Such mixers are used inter alia for mixing with one another, in particular curing, components also in the dental field. These components are usually stored in containers or chambers of a cartridge to which the fixed or replaceable mixer is attachable. By discharging the components from the containers of the cartridge they are passed through the mixer and emerge from this mixed.

Examples of such mixers are described in EP 0 815 929 B1, EP 1 125 626 B1, EP 1 312 409 B1, EP 1 588 757 B1, EP 2 133 138 B1, EP 2 599 540 A1, EP 2 301 656 B1, WO 201 1 / 1 19820 A1, US 2017/0 036 179 A1 and EP 1 426 099 B1.

DE 10 2006 047 81 1 A1 describes a multicomponent cartridge having a fixedly connected mixing element and a dispensing tube, wherein the mixer element is designed as a guide element for the axial displacement of the dispensing tube.

Thus EP 0 815 929 B1 discloses a mixer with a mixing sleeve which extends along a longitudinal axis and at least two inlets and one Has outlet. The mixer further includes a mixing element received in the mixing sleeve which, together with the mixing sleeve, defines a plurality of chambers disposed behind and / or side by side along a flow path from the inlets to the outlet. The chambers are delimited by transverse walls each extending transversely to the longitudinal axis, as well as four side walls each extending parallel to the longitudinal axis. Adjacent chambers are in fluid communication with one another via passage openings provided in the side walls. However, the described mixers are sometimes difficult to produce by injection molding. Furthermore, it has been found that running along the side walls along the side walls of the components to be mixed has an adverse effect on the mixing result.

Depending on the components to be mixed, this known mixer can lead to an unsatisfactory mixing result if, for example, streaks of individual components pass through the entire mixer and escape from the outlet substantially unmixed.

In order to improve the mixing result and to prevent unmixed areas, EP 2 301 656 B1 proposes to provide first flow parts and second flow parts. While the first flow portions guide the components from the center to the exterior of the mixing element, the second flow portions direct the components from the exterior to the center of the mixing element. These flow parts are intended to reverse the direction of flow of parts of the components, but are extremely expensive to manufacture.

EP 2 614 883 A1 also describes a static mixer which has an improved mixing result. For this purpose, in addition to deflecting elements, so-called detaching elements are arranged on the radially outer sides of the mixing element, the detaching elements pointing inwards in the radial direction. This should compensate for different flow velocities of the components in the mixing element.

From EP 2 133 138 B1 a mixer is known, which has a first series of mixing elements for dividing the component streams in a first direction, and a second series of mixing elements for dividing the component streams in a second direction.

A mixer known from EP 1 125 626 B1 has several modifications of a rectangular basic structure of mixing chambers, which have inputs and outputs. One modification has a web inclined to the tube axis, which connects an input to an output in a mixing chamber in such a way that the flow through the web is deflected from the tube wall in the direction of the tube axis or vice versa from the tube axis in the direction of the tube wall. Alternatively, the lengths of three adjacent chambers can be shortened, so that the number of inputs or outputs is reduced. The thus formed three modified chambers are arranged so that a pair of chambers, which are arranged along the tube axis in a row, two of these chambers and a third chamber, which is arranged laterally from the chamber pair, via two openings a connection between the two chambers of the couple.

The aforementioned mixers have very complex mixing elements to solve the occurring problem of streaking, which are correspondingly expensive and expensive to produce. Such mixers are therefore only conditionally suitable for applications in which the components mixed with one another cure and the mixer is therefore used as a disposable product.

Based on this, it is an object of the present invention to provide a mixer of the type described above, which has a simple structure has and allows thorough mixing pasty and / or flowable components.

This object is essentially achieved with a mixer according to claim 1. The mixer has, in particular cuboidal, chambers which are arranged behind and next to each other and communicate with each other via passage openings. Along a flow path from the inlets to the outlet, i. along the path of the components through the mixer, the components flow through some of the chambers and are thereby mixed together.

According to a first aspect of the present invention, the mixing element in this case has two strips which each form, in particular substantially closed, side walls and, in particular parallel to one another or tapering towards one another, extend at a distance from one another in the direction of the longitudinal axis of the mixer. The strips are connected by a further side walls forming and perpendicular to the strip web arranged. The strips form preferably radially, ie, starting from the center or center of gravity and laterally projecting from the longitudinal axis of the mixer, outer side walls of the chambers, which can rest against the inner wall of the mixing sleeve. By contrast, the web can divide the mixing space of the mixing sleeve into two areas as a separating element running parallel to the longitudinal axis. The strips and the web are preferably arranged to each other so that they form an H-shaped cross section (perpendicular to the longitudinal axis), wherein the web connects the strips in particular centrally. This basic structure of the mixing element with two strips and a web is comparatively simple and inexpensive to produce, for example by injection molding. At the same time, this structure causes the mixing element to be comparatively stiff and stable, which facilitates the assembly of the mixing element into the mixing sleeve. According to a further aspect of the invention, a first group of chambers, also chambers of the first group, have first passages arranged in the web, which extend up to the strips, and a second group of chambers, also chambers of the second group, have second ones Through openings, which are positioned at a distance from at least one strip in the web. In other words, the first passage openings extend to a radially outer region of the mixing space formed by the mixing sleeve, as defined by one of the strips, whereas the second passage openings are offset radially inward by one of the strips in the mixing space due to their arrangement. This different arrangement of the passage openings can effectively prevent streaks of the components to be mixed in the outer region of the mixing chamber can pass unmixed to the outlet. In particular, the first passage openings may be designed so that they, optionally interrupted by a further side wall, extend over the entire width of the mixing space from one of the strips to the other of the strips. The second passage openings may for example be designed such that they extend at a distance from the two strips, in turn optionally interrupted by a further side wall, over a radially inner region of the mixing space.

Preferably, the transverse walls are connected to the web and one of the strips. The transverse walls extend according to an embodiment not over the entire width of the web but, for example, only one of the strips to the middle of the web. As a result, about a quarter of the cross section of the mixing chamber is closed in the direction of the longitudinal axis. Transverse walls can be provided on both sides of the web in a cross-sectional plane of the mixer, ie at the same position along the longitudinal axis. It is preferred if the transverse walls are arranged offset to one another, ie, a transverse wall extends on one side of the web of one of the strips to to the middle of the mixing space and another transverse wall extends on the other side of the bridge from the other strip to the middle.

Further side walls of the chambers may extend parallel to the strips from the transverse walls in the direction of the inlets, ie counter to the flow direction of the components. These further side walls are preferably arranged centrally on the web in order to subdivide the halves of the mixing space divided by the web once again, for example then into quarters of the mixing space. Preferably, in this design of the mixing element in the region along the longitudinal axis, in which these further side walls are provided, one of the passage openings provided in the web. Conversely, for example, in the area along the longitudinal axis, in which the web is closed, passage openings in the other side walls available. According to a preferred embodiment, the chambers of the first group and the chambers of the second group each have exactly four Durchtrittsöffnun- gene, of which two passage openings are formed in the web and two further passage openings parallel to the web in the other side walls, so that in particular the parallel to the web extending passage openings open a parallel to the web extending flow direction. In other words, in these chambers, the passage openings, which are preferably arranged offset from one another along the longitudinal axis, are arranged in directions which are perpendicular to the longitudinal axis and to each other. Thus, a mixing of the components takes place through the entry of the components into the respective chamber from chambers which are located in the respective chamber in different quadrants (seen in a cross section perpendicular to the longitudinal axis) and by the exit of the components from the respective chamber Chambers instead, which lie to the respective chamber in different quadrants (seen in a cross section perpendicular to the longitudinal axis). In particular, the two formed in the web passages provided as recesses in the web, while the two other parallel to the web extending passage openings can be provided as recesses in the walls extending perpendicular to the web. Some known mixers have the problem that at the beginning of the mixing process, one of the components enters the mixing chamber faster or in an excessive amount, so that an initial amount of the mixture does not consist of the desired mixing ratio of the components. This problem can be met, inter alia, that the mixing sleeve and the mixing element form a third group of at least one chamber, the side walls closed as a stowage chamber and only one opening, which is formed as an inlet opening in a transverse wall. In this stowage chamber, an initial amount of the components flowing into the mixer can be collected, so that only subsequent quantities of the components, which then usually have the correct mixing ratio, are mixed in and discharged from the mixer. Since the stowage chamber according to the invention has only one inlet opening, but otherwise is not fluidly connected to the other chambers, the components entering the stowage chamber are held there, so that they essentially no longer participate in the further mixing process.

It has been found to be particularly useful if at least one storage chamber is provided at the inlet end of the mixing element. In this embodiment, the leading component is not first passed through other chambers. In the above-exemplified division of the mixing space into four quadrants (seen in a cross section perpendicular to the longitudinal axis), two quadrants offset from one another may be provided with storage chambers, while chambers of the first group or second group are provided in the other two quadrants. The mixing sleeve and the mixing element preferably each form, in cross-section, four chambers arranged next to one another which are at least partially offset from one another in the direction of the longitudinal axis. In principle, however, more than four chambers can be arranged side by side.

The mixing sleeve may have a first section which is rectangular in cross-section, in which the mixing element is accommodated, and a second cross-sectionally circular section, on which the outlet is provided. Also the e.g. can be connected with a cartridge end of the mixing sleeve may have a circular cross-section section. This cartridge-side section can be provided with connecting means for fastening the mixer to the cartridge, for example with bayonet elements or a thread, in particular a male threaded section. Preferably, the mixing sleeve has an inlet section in which an insert, which has at least two nozzles forming the inlets, is sealed in the axial direction. The sealing of the insert relative to the mixing sleeve can be carried out such that the insert is pressed firmly into the mixing sleeve when the application pressure increases. It can also be provided circumferential lips, which invest more tightly depending on the internal pressure in the mixer to a sealing surface. When the insert is freely rotatable relative to the mixing sleeve, the sockets of the insert may engage corresponding sockets or openings of the cartridge without obstructing any relative rotation of the mixing sleeve required to secure the mixer to the cartridge.

Preferably, the nozzles of the insert via at least one compensation chamber forming and / or at least partially radially inwardly extending channels with the chambers flow connected. The arrangement and design of the channels can thus also contribute to the above-described bene problem known mixers with a leading component at the beginning to solve or minimize.

If necessary, a plurality of first groups of chambers and a plurality of second groups of chambers may also be arranged in the mixing element. It has been found particularly favorable to provide one to three first groups and one to three second groups of chambers in the mixing element.

It is further preferred to arrange the first group of chambers and the second group of chambers in the upper and / or middle region of the mixing element, viewed in the direction of discharge of the components. In other words, the first and the second group of chambers are arranged in the region of above 50% or above 70% of the axial length, again in the delivery direction of the components, of the mixing element. Particularly preferably, the first and the second group of chambers are arranged in the range of 50 to 95% of the length of the mixing element, again considered in the direction of application of the components.

It is further preferred if the mixing element has a flow chamber adjacent to the jam chamber, wherein the flow chamber has a passage opening extending parallel to the web. In particular, it is preferable if the cross-section of the flow chamber lying perpendicular to the material discharge direction is 80% to 120% of the cross section of the passage opening of the flow chamber. This improves the flow behavior of the components in the region of the stagnation chamber and the flow chamber, since there is no increased pressure build-up in the area of the passage opening. For this purpose, for example, the length of the mixer as a whole or in sections in the material discharge direction can be adapted, which influences the cross section of the passage opening. In particular, the total length of the mixer can be increased, which also increases the cross section of the passage opening. Alternatively or in addition to this, the blocking chamber can also be shortened in the material discharge direction, which likewise increases the cross section of the passage opening. In continuation of this idea, it can be provided that the flow chamber in the material discharge direction is bounded by a transverse wall and that the transverse wall comprises a transverse wall opening, so that the components can flow at least partially through the transverse wall opening. This reduces the discharge pressure as the components discharge through the mixer, resulting in a higher ease of use during discharge.

It is further preferred if the cross section of the mixing element lying perpendicular to the longitudinal axis in the section of the storage chamber and / or throughflow chamber is 105% to 150%, preferably 105% to 120%, particularly preferably 1 10% ± 5%, of the cross section perpendicular to the longitudinal axis of the mixing element in the material discharge direction is considered subsequent section of the mixing element. In other words, the mixing element is enlarged in a region of the stagnation chamber and / or flow chamber. As a result, a higher flow cross-section can be achieved with the same stability of the mixing element in this area, which is advantageous for reducing the discharge pressures, in particular in the case of highly viscous components. Furthermore, the capacity of the storage chamber is improved so that a large volume flow can be recorded. The stagnation chamber and / or flow chamber are preferably provided in the section which overlies the inlet section of the mixing sleeve, which has the advantage that in this section a broadening of the mixing element can be accommodated by a corresponding adaptation of the inner contour of the inlet section of the mixing sleeve. Otherwise, can Of course, the mixing sleeve itself be adjusted according to the widened contour of the mixing element.

The invention will be explained in more detail by means of embodiments and with reference to the drawings. All described and / or illustrated features alone or in any combination form the subject matter of the invention, regardless of their combination in the claims or their relationships. They show schematically:

Figure 1 a, the individual parts of a mixer according to the invention after a first

1 b shows the individual parts of the mixer according to FIG. 1 a in a further side view, FIG.

FIG. 1 c shows the individual parts of the mixer according to FIG. 1 a in perspective view, FIG. 2 a shows the mixer according to FIG. 1 a in sectional view,

FIG. 2 b shows the mixer according to FIG. 1 a in a further sectional view, FIG. 2 c shows the mixer according to FIG. 1 a in plan view,

3 shows a perspective view of components of the mixer according to FIG. 1a with enlarged details, FIG.

4a shows the mixing element of a mixer according to a second embodiment of the invention in perspective view, FIG. 4b shows the mixing element according to FIG. 4a in a sectional view,

FIG. 5 shows a perspective view of a mixer with a third mixing element, an insert and a mixing sleeve,

6a to 6c show a perspective view (FIG. 6a), a side view (FIG. 6b) and a longitudinal section (FIG. 6c) along the sectional plane A-A of a fourth mixing element,

Figure 7a to 7c is a perspective view (Figure 7a) and a side view

7b) and a longitudinal section (FIG. 7c) along the sectional plane B-B of a fifth mixing element,

FIGS. 8a to 8c show a perspective view (FIG. 8a) and a side view

(Figure 8b) and a longitudinal section (Figure 8c) along the cutting plane C-C of a sixth mixing element,

FIGS. 9a to 9c show a perspective view (FIG. 9a) and a side view

9b) and a longitudinal section (FIG. 9c) along the sectional plane D-D of a seventh mixing element,

10a to 10c a perspective view (Figure 10a) and a side view

(FIG. 10b) and a longitudinal section (FIG. 10c) along the sectional plane E-E of an eighth mixing element, and FIG

Figure 1 1 a to 1 1 c is a perspective view (Figure 1 1 a) and a side view

(Figure 1 1 b) and a longitudinal section (Figure 1 1 c) along the sectional plane FF of a ninth mixing element. The static mixer shown in the first embodiment according to Figures 1 a to 3 is composed essentially of three components, namely a mixing sleeve 1, a mixing element 2 and an insert 3. The mixing sleeve 1 is an elongated member which extends along a longitudinal axis L. extends. The mixing sleeve 1 has a lower inlet region 4 with a substantially circular cross section, a middle region with a rectangular cross section, which defines a mixing chamber 5, and a discharge end 6, which in turn has a substantially circular cross section. As indicated in the illustrated embodiment, the inlet region 4 can be provided with a threaded portion or the like fastening means for connecting the mixer to a cartridge and with an external profiling. The insert 3 is freely rotatable in the inlet area 4 but axially fixed and, for example, latched. The insert 3 is provided with two nozzles 7, which form inlets of the mixer. The application 3 opposite discharge end 6 is provided with an outlet 8. In the illustrated embodiment, a partition wall 9 is formed between the nozzle 7, which is provided with a projecting beyond the mixing sleeve 1 coding element 10 that in a manner not shown for guiding the mixer during the preparation of the compound with a cartridge in a corresponding opening of the Cartridge can intervene. The connecting pieces 7 are fluidically connected to the mixing chamber 5 via channels 1 1, which in some cases lead radially inwardly or arcuately inwardly.

The mixing element 2 is accommodated in the rectangular section of the mixing sleeve 1 and has at its lower end in FIGS. 1 a to 1 c a plate 12 with a central inlet opening 12 a, through which the components to be mixed from the channels 1 1 into the Get mixing chamber 5. In particular the mixing element 2 in the mixing sleeve 1 can be inserted and is held by the plate 12 in the axial direction so that a displacement of the mixing element 2 in the direction of the discharge end 6 of the mixing sleeve 1, for example. By the application pressure of the components prevented. Extending parallel to the longitudinal axis L are two strips 13 of the mixing element 2, which are connected to one another via a web 14 such that in a cross section perpendicular to the longitudinal axis L, the mixing element 2 is H-shaped. The strips 13 extend in the illustrated embodiment over the entire width of the mixing chamber 5 in the region of the mixing sleeve with a rectangular cross-section.

The web 14 is provided with a plurality of through openings, which are rectangular in the illustrated embodiment. First passage openings 15 extend over the entire width of the web 14 and thus adjoin the two strips 13. Second passage openings 16, however, do not extend over the entire width of the web 14 and are thus positioned at a distance from the strips 13. This is also evident from FIG. 2a and the enlarged detail A of FIG.

On the web 14, a plurality of transverse walls 17, which are offset relative to one another in the direction of the longitudinal axis L, are formed, which in the illustrated embodiment extend from one of the strips 13 to approximately the middle of the web 14. In a cross-sectional plane perpendicular to the longitudinal axis L, a first transverse wall 17 is present on one side of the web 14, while on the other side of the web 14 a transverse wall 17 offset from the first transverse wall is provided. In other words, for example, in the enlarged detail view in Figure 3, the front transverse wall 17 is connected to the right strip 13, while provided on the back of the web 14 transverse wall 17 is connected to the left strip 13. From the transverse walls 17 side walls 18 extend parallel to the longitudinal axis L and perpendicular to the web 14 in the figures downwards, ie in the direction of the inlet region 4 of the mixer. In the axial direction, these side walls 18 do not extend to the following transverse wall 17, but are interrupted by further passage openings 19, wherein the passage openings 15, 16 and the passage openings 19 are arranged offset to one another in the direction of the longitudinal axis L, that the passage openings 19 in the areas are provided in which the web 14 is closed, that has no openings 15, 16 has. Conversely, the passage openings 15, 16 are arranged in the regions in which no passage openings 19 are present in the side walls 18.

The mixing sleeve 1, the strips 13, the web 14, the transverse walls 17 and the side walls 18 thus define chambers 20, 21 which are flowed through by the components to be mixed in the flow path from the inlets to the outlet. The length of the chambers 20, 21 in the direction of the longitudinal axis L is defined by the distance between two transverse walls 17 arranged parallel to the longitudinal axis L. The chambers differ essentially by the differences between the passage openings 15, 16 in first chambers 20 and second chambers 21 and by their arrangement within the mixer. Thus, adjacent chambers are arranged offset in the direction of the longitudinal axis L to each other by half a chamber length.

In this arrangement, each of the chambers is provided with two passage openings 15 and 16 and with two passage openings 19. In this case, each of the chambers via the passage openings 15 and 16 with a along the longitudinal axis L recessed by half a chamber length chamber and a vorversetzten half a chamber chamber chamber on the other side of the web 14 in flow communication. In addition, each chamber is above the passage openings 19 with a longitudinal axis L of half a chamber Long recessed chamber and a vorversetzte half a chamber chamber on the same side of the web 14 in flow communication. Thus, each chamber is connected via the four passage openings 15, 16, 19 with four different other chambers. The deflection, splitting into partial flows and bringing together the partial flows of the components during the passage through the various chambers causes an intensive mixing of the components.

In addition to these essentially identical chambers 20, 21, correspondingly incomplete chambers with only one or with only two passage openings are present in the region of the inlet end and the outlet end of the mixer.

In the second embodiment of FIGS. 4a and 4b, the mixing element 2 is modified from the first embodiment in that, in the vicinity of the plate 12, storage chambers 22 are formed which have only one inlet but no outlets. In these storage chambers 22, the initial amount of prone to precursor component can be collected and stored before entering the chambers 20, 21, without this initial amount participates in the further mixing process.

FIG. 5 shows a third embodiment of the mixing element 2. In comparison to the above-described embodiments, the mixing element 2 shown here comprises both a rectangular region 2 a and a helical region 2 b, which adjoins the rectangular region 2 a in the direction of the delivery direction of the components. This has the advantage that the length of the mixing element 2 can be adapted to the respective application requirements. Since the rectangular region 2a has a good mixing, but a high discharge pressure, while the helical region 2b provides a lower discharge pressure, by adjusting the lengths of the rectangular region 2a and the helical region 2b, the mixing effect, the length and the Ausbrindruck be adapted to the respective application requirements. FIGS. 6a to 11c show further embodiments of a mixing element 2 with a storage chamber 22. The components to be mixed can flow out of the insert 3 (not shown) through the inlet opening 12a provided centrally in the collar 15. FIGS. 6a to 6c show a mixing element 2 according to a fourth embodiment. From the longitudinal view of Figure 6b, the arrangement of the storage chamber 22 in, as viewed in Materialaustragsrichtung, first part of the mixing element 2 can be seen. In addition, the sectional plane AA is shown, while the corresponding longitudinal section is shown in the figure 6c.

As the components flow in through the inlet port 12a, they are split at a sidewall 18 and partially flow into a stagnation chamber 22 and partially into a flow chamber 23. From the flow chamber 23, the components flow through a passage 19 to the chambers 20, 21 of the mixing element 2.

In the fourth embodiment shown here, the cross section of the passage opening 19 is smaller than the cross section of the flow chamber 23. The smaller cross section, in this case the cross section of the passage opening 19, is decisive for the pressure drop during discharge of the components.

This can lead to relatively high discharge pressures, wherein the discharge pressure is also influenced by the specific configuration of the mixing element 2 and the specific viscosity of the components. FIGS. 7a to 7c show a fifth mixing element 2 in a perspective view, a side view and as a longitudinal section along the sectional plane BB. In comparison with the example shown in FIGS. 6a to 6c, the mixing element 2 has been shortened at its end located in the material discharge direction. This reduces the discharge pressure, so this embodiment is suitable for higher viscosity components.

FIGS. 8a to 8c show a mixing element 2 in a sixth embodiment. Compared to the fourth embodiment according to FIGS. 6a to 6c, the draft angles on open sides of the mixing element were increased here. The draft angles in particular have an angle range of 0.1 ° to 2 °, preferably 0.1 ° to 1 ° and particularly preferably 0.5 ° ± 0.1 °. FIGS. 9a to 9c show a seventh mixing element widened in the region of the stagnation chamber 22 and the flow chamber 23. As a result, the pressure during discharge of the components is reduced, since the total flow cross section is increased in this area. Therefore, this embodiment is particularly advantageous for high-viscosity components. In addition, the volume of the storage chamber 22 increases, so that larger heats can be compensated.

An eighth mixing element 2 is shown in FIGS. 10a to 10c. Here, in comparison to the previous embodiments, the storage chamber 22 is reduced in size such that the passage opening 19 has been increased. Here, the flow cross-section of the flow chamber 23 and the passage opening 19 is the same size. This in turn means that the discharge pressure is reduced compared to other embodiments. FIGS. 11a to 11c show a ninth mixing element. Here, a transverse wall opening 24 has been added in a transverse wall 17 terminating the flow chamber 23 in the material discharge direction. This allows some of the components to flow through the transverse wall opening 24 directly into the adjacent mixing space without the passage opening 19 having to be passed. Thereby, the discharge pressure of the components is reduced because a part thereof does not need to change its flow direction to flow through the passage opening 19.

LIST OF REFERENCE NUMBERS

1 mixing sleeve

2 mixing element

2a rectangular area

2b helical area

3 use

4 inlet area

5 mixing room

6 dispensers

7 nozzles (inlet)

8 outlet

9 partition

10 coding element

1 1 channel

12 plates

12a central entrance opening

13 strips

14 footbridge

15 passage opening

16 passage opening

17 transverse wall

18 side wall

19 passage opening

20 chamber

21 chamber

22 stowage chamber

23 flow chamber

24 transverse wall opening

L longitudinal axis

Claims

Claims:

1 . Mixer for mixing pasty components with a mixing sleeve (1) extending along a longitudinal axis (L) and having at least one inlet, preferably two inlets (7), and an outlet (8), and at least one in the mixing sleeve (1) accommodated mixing element (2), which defines together with the mixing sleeve (1) a plurality of chambers (20, 21) which are arranged along a flow path from the inlets (7) to the outlet (8) behind and / or next to each other the chambers (20, 21) are delimited by transverse walls (17) extending transversely to the longitudinal axis (L) and by four side walls (13, 14, 18) each extending parallel to the longitudinal axis (L), and wherein adjacent chambers (20, 21) are in fluid communication with one another via passage openings (15, 16, 19) provided in the side walls (14, 18), characterized in that the mixing element (2) has two side walls forming strips (13) through a white tere side walls forming and perpendicular to the strips (13) arranged web (14) are connected, and in that a first group of chambers (20) in the web (14) arranged first passage openings (15) extending up to a strip ( 13), and a second group of chambers (21) having second passage openings (16) which are positioned at a distance from at least one strip (13) in the web (14).

2. Mixer according to claim 1, characterized in that the mixing sleeve (1) and the mixing element (2) form a third group of at least one chamber (22) as the storage chamber (22) closed side walls (13, 14, 18) and only one opening, which is formed as an inlet opening in a transverse wall (17) has.

3. Mixer according to claim 2, characterized in that at least one Staukannner (22) at the inlet end of the mixing element (2) is provided.

4. Mixer according to one of the preceding claims, characterized in that the web (14) connects the strips (13) centrally.

5. Mixer according to one of the preceding claims, characterized in that the transverse walls (17) with the web (14) and one of the strips (13) are connected, and that from the transverse walls (17) in the direction of the inlets (7 ) extend parallel to the strips (13) side walls (18).

6. Mixer according to one of the preceding claims, characterized in that chambers (20) of the first group and the chambers (21) of the second group each have exactly four passage openings (15, 16, 19), of which two passage openings (15, 16 ) are formed in the web (14) and two further passage openings (19) parallel to the web (14) extend.

7. Mixer according to one of the preceding claims, characterized in that the mixing sleeve (1) has a first rectangular cross section in which the mixing element (2) is accommodated, and a second circular cross-section portion (6), on which the outlet (8) is provided.

8. Mixer according to one of the preceding claims, characterized in that the mixing sleeve (1) and the mixing element (2) in cross-section in each case four juxtaposed chambers (20, 21, 22) form, at least partially in the direction of the longitudinal axis (L) offset from each other.

9. Mixer according to one of the preceding claims, characterized in that the mixing sleeve (1) has an inlet portion (4) in which an insert (3) having at least two inlets forming the nozzle (7), sealed, and preferably opposite the mixing sleeve (1) freely rotatable, is fixed.

10. Mixer according to claim 9, characterized in that the connecting piece (7) of the insert (3) via at least one compensation chamber forming and / or at least partially radially inwardly extending channels (1 1) with the chambers (20, 21, 22) are fluidly connected.

1 1. Mixer according to one of the preceding claims, characterized in that the chambers (20) of the first group and the chambers (21) of the second group are arranged in the delivery direction of the components, middle and / or upper region of the mixing element (2).

12. Mixer according to one of claims 2 to 1 1, characterized in that the mixing element (2) has at least one of the storage chamber (22) adjacent flow chamber (23), wherein the at least one flow chamber (23) at least one parallel to the web (14 ) extending through opening (19).

13. Mixer according to claim 12, characterized in that the cross section of the flow chamber (23) lying perpendicular to the material discharge direction is 80% to 120% of the cross section of the passage opening (19) of the flow chamber (23).

14. Mixer according to one of claims 12 or 13, characterized in that the flow chamber (23) in Materialaustragsrichtung by a Transverse wall (17) is limited, and that the transverse wall (26) has a transverse wall opening (27).

15. Mixer according to one of claims 2 to 14, characterized in that the perpendicular to the longitudinal axis (L) lying cross-section of the mixing element (2) in the section of the storage chamber (22) and / or flow chamber (23) 105% to 150% of the vertical to the longitudinal axis (L) lying cross section of the mixing element (2) viewed in the material discharge direction subsequent section of the mixing element (2).