Mixer, multi-component dispenser, and method of dispensing multi-component material from a multi-component dispenser

Abstract

A mixer for mixing multi-component materials includes a mixing element and an inlet. The mixing element is arranged at a longitudinal axis of the mixer for mixing multi-component materials. The inlet section is arranged at the longitudinal axis.

Claims

1. A mixer for mixing multi-component materials, the mixer comprising: a mixing element arranged at a longitudinal axis of the mixer for mixing the multi-component materials; and an inlet section arranged at the longitudinal axis, the inlet section comprising a first channel configured to conduct a first component from an inlet side to an outlet side, the first channel splitting up into a set of sub-channels within the inlet section, the set of sub-channels opening into a set of first outlets arranged at the outlet side and the first outlets being configured to direct a flow of the first component of the multi-component materials to the mixing element arranged at the outlet side, the first channel splitting up into a set of sub-passages prior to splitting up into the set of sub-channels within the inlet section, with the set of sub-channels comprising more sub-channels than the set of sub-passages comprises sub-passages.

2. The mixer according to claim 1, wherein at least some of the sub-channels are of cylindrical shape over at least a part of a length of the at least some of the sub-channels.

3. The mixer according to claim 2, wherein a ratio of a length of each of the sub-channels of the cylindrical shape to an inner diameter of each of the sub-channels is at least 8.

4. The mixer according to claim 1, wherein the set of first outlets have at least a circular outer or inner shape at the outlet side.

5. The mixer according to claim 1, wherein the set of sub-channels comprises between 3 and 12 sub-channels.

6. The mixer according to claim 1, wherein an area of the first channel perpendicular to the longitudinal axis is greater than a sum of the areas of the set of sub-channels perpendicular to the longitudinal axis.

7. The mixer according to claim 1, wherein the set of sub-passages extends between the first channel and the set of sub-channels inclined with respect to the longitudinal axis, or the set of sub-passages are arranged in an intermediate section arranged between the inlet side and the outlet side, with a transition between the intermediate section and the outlet side of the inlet section comprising an outlet conversion of the set of sub-passages to the set of sub-channels, or with a transition between the intermediate section and the inlet side of the inlet section comprising an inlet conversion of the first channel to the set of sub-passages.

8. The mixer according to claim 7, wherein the inlet section comprises an outlet region and the set of sub-channels are distributed over the outlet region, the set of sub-channels having the first outlets project from a base section arranged at a base of the outlet region, and the set of sub-passages split up into the set of sub-channels within the base section.

9. The mixer according to claim 1, wherein the inlet section comprises an outlet region and the set of sub-channels are distributed over the outlet region.

10. The mixer according to claim 9, wherein the set of sub-channels having the first outlets project from the outlet region.

11. The mixer according to claim 9, wherein the mixing element has a mixing element area perpendicular to the longitudinal axis that is less than an area of the outlet region perpendicular to the longitudinal axis, and the first outlets are arranged projecting from a base section and distributed over an area corresponding to the mixing element area of the mixing element.

12. The mixer according to claim 9, wherein the inlet section comprises a second channel for conducting a second component from the inlet side to the outlet side, the second channel has a second outlet at the outlet region, with the second outlet surrounding the first outlets.

13. The mixer according to claim 12, wherein the first outlets project from the outlet region beyond a height of the second outlet, or an area of the second channel perpendicular to the longitudinal axis at the inlet side is less than an area of the second outlet perpendicular to the longitudinal axis, or the first and second channels comprise first and second inlets configured to connect the mixer to a cartridge comprising first and second containers for storage of the multi-component materials.

14. The mixer according to claim 9, wherein the inlet section comprises a single second channel for conducting a second component from the inlet side to the outlet side, the second channel has a second outlet at the outlet region, with the second outlet surrounding the first outlets.

15. The mixer according to claim 1, wherein a spacing between the first outlets and a first mixing segment of the mixing element is selected in the range of 0.1 to 1 times a height of the first mixing segment along the longitudinal axis.

16. A multi-component dispenser comprising: the mixer in accordance with claim 1; a cartridge; and a dispensing mechanism configured to move the multi-component materials from the cartridge and through the mixer.

17. A method of dispensing the multi-component materials from the multi-component dispenser according to claim 16, the method comprising: moving the multi-component materials from the cartridge into the mixer, with the first component being guided in the first channel; conducting the first component through the first channel and splitting up a flow of the first component such that a set of separated partial-streams of the first component result that subsequently exit the set of first outlets in a direction of the mixing element.

18. The mixer according to claim 1, wherein at least some of the sub-channels are of cylindrical shape over at least a part of a length of the at least some of the sub-channels and are arranged to extend in parallel to the longitudinal axis.

19. The mixer according to claim 1, wherein the inlet section comprises an outlet region and the set of sub-channels are unevenly distributed over the outlet region.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be explained in more detail hereinafter with reference to the drawings.

(2) FIGS. 1A and 1B are perspective views of a mixer;

(3) FIG. 2 is a perspective view of dispenser;

(4) FIG. 3A is a part schematic view of the mixer of FIG. 1A;

(5) FIG. 3B is an enlarged view of an inlet section of the mixer of FIG. 3A; and

(6) FIG. 3C is a part schematic part sectional view of the inlet section of the mixer of FIG. 3A.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(7) In the following the same reference numerals will be used for parts having the same or equivalent function. Any statements made having regard to the direction of a component are made relative to the position shown in the drawing and can naturally vary in the actual position of application.

(8) FIG. 1A shows a side view of a first type of mixer 10 having a first type of mixer housing 12. The mixer 10 has a longitudinal axis A extending from an inlet section 14 through the housing 12 to an outlet 22 from the housing 12. A mixing element 16 (see FIG. 3A) and part of the inlet section 14 (see FIG. 3A) are arranged within the mixer housing 12. One inlet 18a into the inlet section 14 can be seen, as an aligner or alignment device (or means) 20a, 20b by which the inlet section 14 is aligned relative to a cartridge 100 (see FIG. 2).

(9) FIG. 1B shows a second type of mixer 10′ in a second type of mixer housing 12′. The mixer of FIG. 1B can for example be used for low ratio mixing of components such as 1:1 or 2:1 mixing ratios.

(10) FIG. 2 shows a multi-component dispenser 98 comprising a multi-component cartridge 100 and the mixer 10. The multi-component cartridge 100 is filled with respective multi-component materials 102a, 102b. The multi-component materials 102a, 102b are stored in respective containers 104a, 104b and can be discharged from the cartridge 100 by a plunger (not shown) as a dispensing mechanism configured to bring about a movement of said multi-component material 102a, 102b from the cartridge 100 and into the inlets 18a, 18b of the inlet section 14 of the mixer 10.

(11) The mixer 10 is connected to the cartridge 100, on the one hand, by the alignment device 20a, 20b for a coded alignment between the mixer 10 and the cartridge 100. On the other hand, the mixer 10 is connected to the cartridge 100 by a retainer nut (not shown). The retainer nut is adapted to cooperate with the cartridge 100 and engages the mixer housing 12 of the mixer 10 in order to fix the mixer 10 to the cartridge 100.

(12) The mixer 10 could also be connected to the cartridge 100 by other forms of connection means or connectors, such as a bayonet connection or a plug-on connection. Similarly further alignment devices 20a, 20b, or alignment devices 20a, 20b different from the ones shown in the drawings can be used to connect the mixer 10 to the cartridge 100 in an aligned manner.

(13) In this connection it should be noted that the following description of the mixer 10 relates to a static mixer 10, it is however possible to employ the inlet section 14 described in the following in a dynamic mixer (not shown).

(14) FIG. 3A shows a part schematic view of the mixer 10 of FIG. 1A without the housing 12. The housing 12 is typically attached to the inlet section 14 via an annular protrusion 24 that engages a recess (not shown) formed in the inner surface of the housing 12 and two noses 26 that engage corresponding cut outs (also not shown) present at the housing 12.

(15) The mixer 10 is configured to mix multi-component materials 102a, 102b. For this purpose, the mixer 10 comprises the mixing element 16 arranged at the longitudinal axis A of the mixer 10 and the inlet section 14 also arranged at the longitudinal axis A. The mixing element 16 is configured to mix multi-component materials.

(16) For the purpose of mixing the multi-component material 102a, 102b, the mixing element 16 comprises several mixing segments 16′ arranged one after the other along the longitudinal axis A. Each mixing segment 16′ is configured to divide and re-combine part flows of the multi-component material 102a, 102b along the longitudinal axis A. In this way the part flows of the multi-component material 102a, 102b are repeatedly divided and re-combined by the mixing element 16 and the several mixing segments 16′ along the longitudinal axis A so that the multi-component material 102a, 102b is thoroughly mixed prior to this exiting the outlet 22.

(17) In this connection it should be noted that each mixing segment 16′ of the mixing element 16 can have a height in the direction in parallel to the longitudinal axis A selected in the range of 2 to 18 mm, preferably in the range of 4 to 15 mm.

(18) In this connection it should further be noted that a mixing element 16 is typically composed of between 2 and 20, especially of between 4 and 16 mixing segments 16′. The number of mixing segments 16′ used for a mixing element 16 depends on the multi-component material 102a, 102b, i.e. the viscosities thereof, to be mixed by the mixing element 16.

(19) The inlet section 14 is configured to guide the multi-component materials 102a, 102b to the mixing element 16 in such a way that a mixing result of the multi-component materials 102a, 102b is improved in the mixer 10.

(20) The specific type of mixing element 16 used can be varied and can be selected as e.g. a quadro mixer, or a T-mixer sold by Sulzer Mixpac Ltd. The present invention is not limited to the specific type of mixing element 16.

(21) The inlet section 14 comprises a first channel 28 (see also FIG. 3A) for conducting a first component 102a of the multi-component material from an inlet side 30 to an outlet side 32.

(22) The first channel 28 splits up into a set of sub-channels 34 within the inlet section 14, with the set of sub-channels 34 opening into a set of first outlets 36 arranged at the outlet side 32. The first outlets 36 are configured to direct a flow of the multi-component material 102a to the mixing element 16 arranged at the outlet side 32.

(23) In this connection it should be noted that the inlet side 30 does not denote a specific surface, but rather relates to that part of the inlet section 14 comprising the inlets 18a, 18b, similarly the outlet side 32 does not denote a specific surface, but rather relates to that part of the inlet section 14 comprising the inlets 18a, 18b the first outlets 36 and a second outlet 54 (see FIG. 3C).

(24) The mixing element 16 has a mixing element area perpendicular to the longitudinal axis A that is less than an area of an outlet region 50 perpendicular to the longitudinal axis A. The first outlets 36 are arranged distributed over an area corresponding to the mixing element area of the mixing element 16 in order to ensure that a flow of streams of the first component 102a, i.e. the low viscosity material, is directed, preferably directly, at the mixing element 16.

(25) In this connection it should be noted that spacing between the first outlets 36 and the mixing element 16, i.e. a first mixing segment 16′ of the several mixing segments 16′ of the mixing element 16, along the longitudinal axis A is selected in the range of 0.1 to 1, preferably 0.4 to 0.6, especially around 0.5, times the height of the first mixing segment 16′ along the longitudinal axis A. In this connection it should further be noted that the spacing between the first outlets 36 and the first mixing segment 16′ is selected in the range of range of 0 to 18 mm, in particular in the range of 0 to 15 mm, preferably in the range of 0.2 to 10 mm, especially preferably in the range of 0.4 to 5 mm, particularly in the range of 0.5 to 4 mm, especially of 1 to 3 mm.

(26) In this way a spacing of the first outlets 36 to the mixing element 16 can be set. The spacing can be set in dependence on the difference in viscosities between the low viscosity component 102a and the high viscosity component 102b. For a large difference in viscosities the spacing between the first outlets 36 and the mixing element 16 is not allowed to be set too large, as the low viscosity component 102a then follows pathways as if the sub-channels 34 are not present. This is because the low viscosity component 102a can then flow close to walls 17 of the mixing element 16 which leads to a reduction in the mixing result of the multi-component materials 102a, 102b.

(27) If the distance is selected as too small or if the first outlets 36 penetrate the mixing segment for a smaller difference in viscosities, then the walls 17 of the mixing element 16 may partly block the first outlets 36. In this connection it should also be noted that if the spacing between the first outlets 36 and the mixing segment is too small then the low viscosity component 102a can also flow too close to the walls 17.

(28) FIG. 3B shows an enlarged view of the inlet section 14 of the mixer 10 of FIG. 3A. The sub-channels 34 are of cylindrical shape over their length between a base section 38 and the first outlets 36 and extend in parallel to the longitudinal axis A.

(29) A web 40 of material is arranged between each pair of sub-channels 34. The webs 40 of material are respectively provided to connect two sub-channels 34 one to another in order to increase their stability and ensure their alignment with respect to the mixing element 16. The webs 40 of material project from the base section 38 between the respective pair of sub-channels 34.

(30) In this connection it should be noted that a ratio of length of the sub-channels 34 of cylindrical shape to inner diameter of each sub-channel 34 is 10. The first outlets 36 have a circular outer and inner shape at the outlet side 32.

(31) It should further be noted that the length of each sub-channel 34 can be selected in the range of 5 to 20 mm, preferably in the range of 7 to 13 mm and especially around 10 mm.

(32) It should further be noted that an internal diameter of each of the sub-channels 34 and of each of the first outlets 36 is adapted to the viscosity of the low viscosity material 102a. In this connection diameters in the range of 0.1 to 2 mm, in particular of 0.7 to 1.3 mm and especially of around 1 mm have been found to be advantageous.

(33) These parameters are selected in order to ensure a uniform guiding of partial streams of the first component 102a of the multi-component material directed at the mixing element 16 arranged at the outlet side 32. In this connection it should be noted that it is also important that the diameter of each sub-channel 34 is made with low tolerances.

(34) The inlet section 14 comprises 6 sub-channels 34 in the present instance. It should be noted in this connection that the set of sub-channels 34 could comprise between 3 and 12 sub-channels 34, preferably between 5 and 10 sub-channels 34.

(35) An area of the first channel 28 perpendicular to the longitudinal axis A is greater than a sum of the areas of the set of sub-channels 34 perpendicular to the longitudinal axis A. In the present instance the sum of the areas of the sub-channels 34 amounts to 18.85 mm.sup.2 (1 mm diameter for each sub-channel 34), whereas that of the first channel 28 amounts to 28.3 mm.sup.2 (3 mm diameter for the first channel 28).

(36) FIG. 3C shows a part schematic part sectional view of the inlet section 14 of the mixer 10 of FIG. 3A. The first channel 28 splits up into a set of sub-passages 42 (of which only one is visible in the section of FIG. 3C) prior to splitting up into said set of sub-channels 34 within the inlet section 14. In the embodiment shown twice as many sub-channels 34 are provided as sub-passages 42.

(37) The set of sub-passages 42 extend between the first channel 28 and the set of sub-channels 34 inclined with respect to the longitudinal axis A. For this purpose the set of sub-passages 42 are arranged in an intermediate section 44 arranged between the inlet side 30 and the outlet side 32.

(38) A transition between the intermediate section 44 and the outlet side 32 comprises an outlet conversion 46 of the set of sub-passages 42 to the set of sub-channels 34.

(39) A transition between the intermediate section 44 and the inlet side 30 comprises an inlet conversion 48 of the first channel 28 to the set of sub-passages 42.

(40) The inlet section 14 further comprises the outlet region 50 and the set of sub-channels 34 are unevenly distributed over the outlet region 50. The set of sub-channels 34 are arranged to project from the outlet region 50. More specifically the set of sub-channels 34 project from the base section 38 arranged at a base 52 of the outlet region 50. The set of sub-passages 42 split up into said set of sub-channels 34 within the base section 38.

(41) The inlet section 14 further comprises a second channel 56 for conducting a second component 102b of the multi-component material from the inlet side 30 to the outlet side 32. The second channel has the second outlet 54 at the outlet region 50. The second outlet 54 is designed such that the material 102b flowing through the second channel that has a higher viscosity than the material 102a flowing through the first channel 28 arrives at the first outlets 36 at approximately the same time as the low viscosity material 102a, such that the low viscosity material that has been split up in several partial streams is fed into the high viscosity material 102b at spatially different locations prior to entering the mixing element 16, with the first and second materials 102a, 102b entering the mixing element 16 at approximately the same time and speed and at a desired mixing ratio. For this purpose the second outlet 54 is designed to surround each of the first outlets 36. To ensure an improved mixing the first outlets 36 project from the outlet region 50 beyond a height of the second outlet 54 so that the first component 102a can be injected into the second component in an efficient manner.

(42) An area of the second channel 56 perpendicular to the longitudinal axis A at the inlet side 30 is less than an area of the second outlet 54 perpendicular to the longitudinal axis A.

(43) As indicated in FIG. 3C the first and second channels 28, 56 comprise the first and second inlets 18a, 18b for connecting the mixer 10 to the cartridge 100 comprising first and second containers 104a, 104b for the storage of the multi-component materials 102a, 102b.

(44) In use of the mixer 10 the multi-component material 102a, 102b, is dispensed via the multi-component dispenser 98. For this purpose the multi-component material 102a, 102b is guided from the cartridge 100 into the inlets 18a, 18b of the inlet section 14 of the mixer 10.

(45) The first component 102a having a lower viscosity than the second component 102b is guided in the first channel 28. The first component 102a is then conducted through the first channel 28 and split up into partial-flows in the sub-passages 42 present in the intermediate section 44 following the conductance of the first component 102a through the sub-passages 42, the first component 102a is again split up into the set of sub-channels 34 in such a way that a set of separated partial-streams result that subsequently exit said set of first outlets 36 in the direction of the mixing element 16 for a thorough through mixing with the second component 102b.

(46) The second component 102b, i.e. the component having a higher viscosity than the first component 102a, is conducted through the second channel 56 to the second outlet 54 such that a single stream of material of the second component surrounds each partial-stream of the set of partial-streams of the first component 102a in order to feed the first component 102a of low viscosity material into the second component 102b of high viscosity material such that a pre-mixing of the multi-component material 102a, 102b takes place before introducing the multi-component material 102a, 102b into the mixing element 16. Thereby the mixing results achievable with the mixer 10 can be improved considerably in contrast to prior art mixers.