EP3921071B1 - Dynamischer mischer, abgabeanordnung und verfahren zur abgabe von mehrkomponentenmaterial aus einer kartusche - Google Patents

Dynamischer mischer, abgabeanordnung und verfahren zur abgabe von mehrkomponentenmaterial aus einer kartusche Download PDF

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Publication number
EP3921071B1
EP3921071B1 EP20713897.5A EP20713897A EP3921071B1 EP 3921071 B1 EP3921071 B1 EP 3921071B1 EP 20713897 A EP20713897 A EP 20713897A EP 3921071 B1 EP3921071 B1 EP 3921071B1
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EP
European Patent Office
Prior art keywords
rotor blades
mixer
row
dynamic mixer
rotor
Prior art date
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Active
Application number
EP20713897.5A
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English (en)
French (fr)
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EP3921071A1 (de
Inventor
Lorenz Schenk
Samira JAFARI
Josef Moser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medmix Switzerland AG
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Medmix Switzerland AG
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Publication of EP3921071A1 publication Critical patent/EP3921071A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2721—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces provided with intermeshing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2722—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces provided with ribs, ridges or grooves on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2723—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces the surfaces having a conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles
    • B01F35/52—Receptacles with two or more compartments
    • B01F35/522—Receptacles with two or more compartments comprising compartments keeping the materials to be mixed separated until the mixing is initiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/2305—Mixers of the two-component package type, i.e. where at least two components are separately stored, and are mixed in the moment of application

Definitions

  • the present invention relates to a dynamic mixer having two or more inlets arranged at an inlet side of the dynamic mixer and an outlet arranged at an outlet side of the dynamic mixer, wherein the mixing element of the dynamic mixer is configured to be coupled to a drive shaft to drive the mixing element about a longitudinal axis of the mixing element.
  • the invention further relates to a dispensing assembly comprising a dispenser, a cartridge, optionally filed with a multi-component material, received in the dispenser and a dynamic mixer and to a method of dispensing multi-component material from a cartridge using a dynamic mixer.
  • Dynamic mixers respectively mixing tips, as they are also known as, are used to mix multi-component material dispensed from a multi-component cartridge.
  • Such mixers are used in a plethora of fields of application ranging from industrial applications, such as the use of adhesives to bond structural components one to another, or as protective coatings for buildings or vehicles, to medical and dental applications, for example, to make dental molds.
  • the multi-component material is, for example, a two-component adhesive comprising a filler material and a hardener.
  • a two-component adhesive comprising a filler material and a hardener.
  • the multi-component material has to be thoroughly mixed.
  • the dynamic mixers are structured to repeatedly divide and recombine part flows of the multi-component material to thoroughly mix the multi-component material.
  • EP0135219A1 discloses a dynamic mixer as per the preamble of claim 1.
  • Such a dynamic mixer may have two or more inlets arranged at an inlet side of the dynamic mixer and an outlet arranged at an outlet side of the dynamic mixer, wherein the mixing element of the dynamic mixer is configured to be coupled to a drive shaft via a coupling to drive the mixing element about a longitudinal axis of the mixing element, the mixing element comprising a rotor body and a two or more rows of rotor blades projecting radially from the rotor body away from the longitudinal axis between the rotor body, with a first row of rotor blades being arranged closer to the two or more inlets than the second row of rotor blades, the dynamic mixer further comprising a housing accommodating the mixing element, wherein an area between two directly adjacent rotor blades of the first row of rotor blades, the rotor body and the housing is an open area at a mixing inlet end, wherein each of the inlets is formed by a passage having an inlet opening and a mixer entry opening, with the inlet opening being remote from the rot
  • the slice of the first component is then brought into contact with a slice of the second component of the multi-component material if a two-component material is to be mixed with the dynamic mixer, this process is repeated several times as the mixing element rotates further to mix the respective components.
  • Such slices of uniform shapes and size also reduces the pressure loss within the dynamic mixer as less air pockets are caught between pairs of rotor blades.
  • volume of space within a dynamic mixer having such inlets can be reduced such that the waste volume can be reduced with such dynamic mixers.
  • dynamic mixers having such inlets can yield an improvement of efficiency of up to 20% in comparison to prior art dynamic mixers.
  • dynamic mixers can be produced in an injection molding process and also in a 3D printing process.
  • the mixer inlet area may be the area of the opening of the inlet passage at the end of the passage directly adjacent to the rotor blades.
  • the open area may be the area between two rotor blades that are arranged next to one another, specifically in the region of the mixer inlet area.
  • the mixer inlet area may be less than twice the open area. If the mixer inlet area is selected too large, then more material may be retained in the dynamic mixer which increases the residual waste volume present in the dynamic mixer.
  • Each inlet may have a cross-sectional size and/or shape that may change between the inlet opening and the mixer entry opening, with the inlet opening optionally having a circular shape.
  • the mixer entry opening can be formed such that it has a shape and size that is ideally suited for forming as uniform as possible slices of multi-component material between two directly adjacent rotor blades to obtain as good as possible mixing results and to reduce the pressure loss within the dynamic mixer.
  • a variation of the cross-sectional size may in some embodiments be a continuous increase or decrease in size or also a variation between increase and decrease in size over the length of the passage.
  • a variation in the shape of the cross-section may in some embodiments be a change from a circular cross-section of the passage to that of a ring segment, or from circular to polygonal or the like.
  • the inlet opening may have an inlet area that is smaller than the mixer inlet area of the mixer entry opening.
  • Different cartridges have different outlet sizes and in order to obtain as good a mixing result as possible it may be beneficial to increase the diameter of the flow of the respective component exiting the multi-component cartridge so that the ideal amount of multi-component material can be made available at the mixer entry opening.
  • the tooling required for the production of the inlets can be simplified as the inlets can be easily removed e.g. from an injection mold if they have a shape which reduces in size between two ends of the inlets.
  • the inlet opening may thus be the opening into the dynamic mixer that is furthest away from the outlet opening and that is arranged at the end of the passage forming the inlet into the dynamic mixer.
  • the cross-sectional size of the inlet may increase, in particular continuously increases, between the inlet opening and the mixer entry opening. In this way a particularly good flow of the multi-component material can be achieved in the respective inlet leading to a reduced pressure loss within the dynamic mixer.
  • the change in size and/or shape of the respective inlet passage is selected in dependence on a size of the outlet of a corresponding cartridge or the like connected to the inlet of the dynamic mixer and the actual size of the housing and the mixing element arranged within the housing of the dynamic mixer.
  • the inlet opening may be arranged in parallel to the mixer entry opening, optionally with the inlet opening and the mixer entry opening being arranged in parallel with an outlet opening of the outlet, i.e. the inlet opening and the mixer entry opening are arranged at an angle of 90° with respect to the longitudinal axis. In this way an as uniform as possible flow of material can be made available at the mixer entry opening which improves the mixing results of the multi-component material.
  • the inlet opening may be arranged inclined with respect to the mixer entry opening at angles of less than 60°, preferably less than 45° with respect to the longitudinal axis, whereas the mixer entry opening is then still arranged at an angle of 90° with respect to the longitudinal axis.
  • the mixer entry opening may have a curved shape in a cross-section thereof, in particular wherein the mixer entry opening has one of an arc shape and a shape resembling a ring shaped section perpendicular to the longitudinal axis, the ring shaped section having inner and outer curved side surfaces and planar side surfaces.
  • Forming the mixer entry opening in this way means that it is adapted such that it resembles the space present between two rotor blades of the first row of rotor blades ensuring that an as uniform as possible slice of multi-component material is entrained by the pair of rotor blades every time a pair of rotor blades passes the respective mixer entry opening.
  • the rotor body may comprise three or four or more rows of rotor blades arranged one after the other along the longitudinal axis of the mixing element, with the first row of the three or four or more rows of rotor blades being able to be arranged directly adjacent to the mixer entry opening, the second row of the three or four or more rows of rotor blades being able to be arranged between the first and the third or fourth or more rows of rotor blades and the third or fourth or further row of rotor blades being able to be arranged closer to the outlet than the first row of rotor blades.
  • a row of stator blades may be arranged between at least one of the rows of the two or more rows of rotor blades, optionally with a row of stator blades being able to be arranged between each row of the two or more rows of rotor blades, and/or optionally with the stator blades being arranged at an inner surface of the housing.
  • two rows of stator blades that are arranged directly adjacent to one another with a gap therebetween may be considered a single row of stator blades provided the height of the two rows of stator blades is less than a height of the adjacent rows of rotor blades.
  • two rows of rotor blades that are arranged directly adjacent to one another with a gap therebetween may be considered a single row of rotor blades provided that the height of the two rotor blades arranged directly adjacent to one another does not exceed 400% of a height of a directly adjacent stator blade.
  • the third and optionally the fourth row of rotor blades may have a different axial position and/or outer size along the longitudinal axis of the mixing element with respect to the first row of rotor blades.
  • the rotor body may reduce in diameter along the longitudinal axis between the first row of rotor blades and the outlet. By reducing the size of the rotor body one can direct the flow of the rotating multi-component material onto a single flow path so that the mixed multi-component material can exit the outlet on the shortest possible flow path to minimize the residual waste in the dynamic mixer.
  • the rotor body may have a front end in the region of the mixer entry opening and a rear end in the region of the outlet, wherein the rotor body may have a conical outer shape at a rear end thereof, with rotor blades projecting therefrom, optionally with third and/or fourth rows of rotor blades projecting therefrom.
  • a conical outer shape enables the formation of particularly short flow paths for the multi-component material.
  • the coupling may be formed at or in the rotor body. By forming the coupling in or at the rotor body the coupling can be integrally produced therewith reducing the number of components of a dynamic mixer.
  • the first row of rotor blades may comprise more rotor blades than the third row of rotor blades.
  • the rotor body is formed such that the diameter of the rotor body reduces between the inlets and the outlets, the reduction in the number of rotor blades at the thinner part of the rotor body ensures a reduction in the size of the flow path of the multi-component material leading to less air volume present in the dynamic mixer in which waste material can be left behind.
  • the size of the flow path reduces, in particular continuously reduces between the mixer inlet area and the outlet.
  • rotor blades in particular half as many rotor blades, may be provided in the third row of rotor blades as rotor blades may be provided in the first row of rotor blades, optionally with as many rotor blades being able to be provided in the second row of rotor blades as are provided in the first row of rotor blades. In this way a particularly beneficial design of the dynamic mixer can be achieved.
  • the number of stator blades is typically selected to create the best possible shear forces on the rotating multi-component material to achieve beneficial mixing results for this reason the number of stator blades may be equal to or less than the number of rotor blades.
  • a height in parallel to the longitudinal axis of the first row of rotor blades may be at least 5 mm, preferably at least 6 mm. Selecting a height of less than 5 mm results in reduced quality mixing results which is not desirable.
  • a height of the stator blades arranged directly adjacent to a rotor blade is less than a height of the rotor blades measured in parallel to the longitudinal axis, in particular wherein a height of the stator blades may be less than half a height of the directly adjacent rotor blade.
  • the present invention relates to a dispensing assembly comprising a dispenser, a cartridge, optionally filed with a multi-component material, received in the dispenser and a dynamic mixer, wherein the dispenser comprises a drive shaft that can be coupled to the mixing element of the dynamic mixer to drive the mixing element about a longitudinal axis of the mixing element on dispensing said multi-component material from said cartridge.
  • the multi-component material stored in the dynamic mixer may be mixed with particularly advantageous mixing results.
  • the multi-component cartridge can thus be filled with materials selected from the group of members consisting of topical medications, medical fluids, wound care fluids, cosmetic and/or skin care preparations, dental fluids, veterinary fluids, adhesive fluids, disinfectant fluids, protective fluids, paints and combinations of the foregoing.
  • Such fluids and hence the dispensing assembly can therefore be expediently used in the treatment of target areas such as the nose (e.g. anti-histaminic creams etc.), ears, teeth (e.g. molds for implants or buccal applications (e.g. aphtas, gum treatment, mouth sores etc.), eyes (e.g. the precise deposition of drugs on eyelids (e.g. chalazion, infection, anti-inflammatory, antibiotics etc.), lips (e.g. herpes), mouth, skin (e.g.
  • the fluids and hence the dispensing assembly can also be used in an industrial sector both for the production of products as well as for the repair and maintenance of existing products, e.g. in the building industry, the automotive industry, the aerospace industry, in the energy sector, e.g. for windturbines, etc.
  • the dispensing assembly can, for example, be used for the dispensing of construction material, sealants, bonding material, adhesives, paints, coatings and/or protective coatings.
  • the present invention relates to a method of dispensing multi-component material from a cartridge using a dynamic mixer, the method comprising the steps of:
  • Fig. 1 shows a perspective part sectional view of a first type of dynamic mixer 10.
  • the dynamic mixer 10 has two inlets 12 arranged at an inlet side 14 of the dynamic mixer 10.
  • the dynamic mixer has an outlet 16 arranged at an outlet side 18 of the dynamic mixer 10.
  • a mixing element 20 of the dynamic mixer 10 is arranged between the two inlets 12 and the outlet 16.
  • the mixing element 20 is configured to be coupled to a drive shaft 22 (see Fig. 9 ) via a coupling 24 to drive the mixing element about a longitudinal axis A of the mixing element 20.
  • the coupling 24 may either be formed in the rotor body 26 or at the rotor body 26, e.g. within a shaft extending from the rotor body 26, with the shaft being integrally formed with the rotor body 26.
  • the mixing element 20 comprises a rotor body 26 arranged between the inlets 12 and the outlet side 18.
  • a first and a second row of rotor blades 28, 30 can be seen in Fig. 1 each comprising a plurality of rotor blades 28', 30'.
  • the respective rotor blades 28', 30' project radially from the rotor body 26 away from the longitudinal axis A.
  • the first row of rotor blades 28 is arranged closer to the two inlets 12 than the second row of rotor blades 30.
  • the dynamic mixer 10 further comprises a housing 32 accommodating the mixing element 20.
  • the housing 32 is formed of two parts, a base part 34 and a top part 36.
  • the top part 36 being received in the base part by a press fit.
  • a nose 38 of the top part 36 presses against a collar 40 of the base part 34.
  • the parts could also be connected by way of a weld.
  • the inlets 12 of the dynamic mixer 10 are integrally formed in one piece with the base part 34.
  • the mixing element 20 is journaled with respect to the base part 34 as indicated e.g. relative to Fig. 4 .
  • the inlets 12 each comprise a passage 42 that extends between an inlet opening 44 and a mixer entry opening 46, i.e. the inlet opening 44 is arranged remote from the first row of rotor blades 28.
  • the mixer entry opening 46 is arranged directly adjacent to the first row of rotor blades 28.
  • Each inlet 12 has a cross-sectional size and shape that changes between the inlet opening 44 and the mixer entry opening 46.
  • the inlet opening 44 may be formed as having a circular shape. In this connection it should be noted that also other shapes different from the circular shape are possible.
  • the cross-sectional size of each inlet 12 increases between the inlet opening 44 and the mixer entry opening 46.
  • First and second stator blades 48, 50 are also visible in the cut-away part of the housing 32.
  • the first stator blade 48 is arranged between the first and second row of rotor blades 28, 30.
  • the first and second stator blades 48, 50 are arranged at an inner surface 52 of the housing 32.
  • Fig. 2 shows a top view of the dynamic mixer of Fig. 1 .
  • the outlet 16 has a circular shaped outlet opening 54 via which components mixed using the mixing element 20 of the dynamic mixer 10 exit the dynamic mixer 10.
  • each inlet 12 is arranged in parallel to the mixer entry opening 46 and to the outlet opening 54 of the outlet 16.
  • Fig. 3 shows a sectional view of the dynamic mixer of Fig. 1 taken along the sectional line A : A of Fig. 2 .
  • the rotor body 26 comprises a third row of rotor blades 56 arranged adjacent to the second row of rotor blades 30 along the longitudinal axis A of the mixing element 20.
  • the third row of rotor blades 56 is arranged closer to the outlet 16 than the first row of rotor blades 28.
  • the rotor blades 56' of the third row of rotor blades 56 each have a different axial position and outer size along the longitudinal axis A of the mixing element 20 in comparison to the rotor blades 28' of the first row of rotor blades 28.
  • the rotor blades 56' of the third row of rotor blades 56 is arranged at a conical shaped part 26' of the rotor body 26.
  • the angle of the conical shaped part 26' of the rotor body 26 relative to the longitudinal axis A is 25°.
  • the angle of the conical shaped part 26' and the longitudinal axis A can be selected in the range of 10 to 70°.
  • the rotor body 26 reduces in diameter along the longitudinal axis A between the first row of rotor blades 28 and the outlet 16.
  • An area between two directly adjacent rotor blades 28' of the first row of rotor blades 28, the rotor body 26 and the housing 32 is an open area 58 at a mixing inlet end 60.
  • the mixer entry opening 46 is arranged directly adjacent to the open area 58 and hence to the mixing inlet end 60.
  • the mixer entry opening 46 has a mixer inlet area 46', with the mixer inlet area being greater than the open area 58. More specifically the mixer inlet area 46' is less than twice the open area 58.
  • the inlet opening 44 of each inlet 12 has an inlet area 44' that is smaller than the mixer inlet area 46' of the mixer entry opening 46.
  • the respective mixer inlet area 46' of the mixer entry opening 46 has a size which corresponds to 1.4 to 1.6, preferably 1.5 or at least substantially 1.5, times the area of the respective inlet area 44' of one of the inlet openings 44.
  • an area of the outlet opening 54 is selected in the range of 0.5 to 1.5 times the sum of the inlet areas 44' of each inlet opening 44 of each inlet 12.
  • a width of the mixer entry opening 46 is selected in the range of 1.3 to 1.8, preferably 1.5 or at least substantially 1.5, times a spacing between the first blades 28' of the first row of rotor blades 28 at the radial most outer point of the respective rotor blades 28'.
  • the mixer inlet area 46' corresponds to 1.4 to 1.6, preferably 1.5 or at least substantially 1.5, times the open area 58.
  • the area of one of the two mixer inlet areas 46' respectively the inlet area 44' of one of the inlet openings 44 of the two inlets 12 can be smaller in size than the other one of the corresponding inlets in order to permit an adaptation of the dynamic mixer to high and low viscosity liquids.
  • the mixer entry opening 46 has a shape resembling a ring shaped section 62 perpendicular to the longitudinal axis A.
  • the ring shaped section 62 having inner and outer curved side surfaces 64, 64' and planar side surfaces 66, 66'.
  • a row of stator blades 48' is arranged between the first and second rows of rotor blades 28, 30, a second row of stator blades 50' is arranged between the second and third rows of rotor blades 30, 56 and a third row of stator blades 68 is arranged between the third row of rotor blades 56 and the outlet 16.
  • the first row of rotor blades 28 comprises more rotor blades 28' than the third row of rotor blades 56. It is preferred if less rotor blades 56', in particular half as many rotor blades 56', are provided in the third row of rotor blades 56 as rotor blades 28' are provided in the first row of rotor blades 28. As also shown in Figs. 3 and 5 as many rotor blades 30' are provided in the second row of rotor blades 30 as are provided in the first row of rotor blades 28.
  • the first and second row of rotor blades 28, 30 comprise rotor blades 28', 30' having a like shape, in particular a rectangular shape, and size, i.e. a height of 6 mm measured in parallel to the longitudinal axis A.
  • the height of the rotor blades 28' should be at least 5 mm and is preferably selected in the range of 5 to 10 mm.
  • the height of the stator blades 48 of the first row of stator blades 48' is less than the height of the rotor blades 28', 30' and is especially less than half the height of the rotor blades 28', 30' and is generally selected in the range of 20% to 50% of the height of the rotor blades 28', 30'.
  • a height of the rotor blades 56' of the third row of rotor blades 56 is greater than a height of the rotor blades 28', 30' of the first or second row of rotor blades 28, 30.
  • the height of the rotor blades 56' is selected in the range of 8 to 20 mm, especially of 10 to 12 mm.
  • the rotor blades 56' of the third row of rotor blades 56 have a wedge shaped design.
  • the design of the rotor blades 56' of the third row of rotor blades 56 may deviate from the wedge shaped design as shown e.g. in connection with Fig. 8 .
  • an axial gap along the longitudinal axis A between directly adjacent rotor blades 28', 30', 56' and stator blades 48, 50, 68' is generally selected in the range of 0.01 to 0.4 mm, and preferably is selected as 0.2 mm as shown in Figs. 3 , 4 and 8 .
  • a radial gap between the inner surface 52 of the housing 32 and one of the rotor blades 28', 30', 56' respectively between one of the stator blades 48, 50, 68' and the rotor body 26 is selected in the range of 0.01 to 0.4 mm, and preferably is selected as 0.2 mm as shown in Figs. 3 , 4 and 8 .
  • each of the rotor blades 28', 30', 50' may have a wedge shaped outer contour, with the wedge becoming smaller as the wedge extends away from the longitudinal axis A.
  • stator blades 48', 50', 68' that project radially between the rotor body 26 and the housing 32 also have a wedge like outer shape, with the wedge becoming smaller as the wedge extends away from the longitudinal axis A.
  • first row of stator blades 48' has a smaller outer circumference in comparison to the second row of stator blades 50'.
  • the rotor body 26 Directly adjoining the conical shaped part 26' the rotor body 26 also has a cylindrical shaped part 26" at its front end 70, with the first and second row of rotor blades 28, 30 projecting from the cylindrical shaped part 26".
  • a passage 74 extends between two directly adjacent rotor blades 30' of the second row of rotor blades 30 and two directly adjacent rotor blades 56' of the third row of rotor blades 56 between the conical shaped part 26' and the cylindrical shaped part 26".
  • a base 74' of the respective passage 74 extends in parallel with the longitudinal axis A and as can be seen in Fig. 5 the passage 74 has a rectangular cross-section in parallel with the longitudinal axis A.
  • the passages 74 are provided in order to ensure a reliable assembly of the dynamic mixer 10.
  • Fig. 4 shows a sectional view of a further dynamic mixer 10 similar to the view of Fig. 3 .
  • the angle of the conical shaped part 26' of the rotor body 26 relative to the longitudinal axis A is 45°.
  • the rotor body 26 of Fig. 4 has a front end 70 in the region of the mixer entry opening 46 and a rear end 72 in the region of the outlet 16.
  • the rotor body 26 has the conical outer shaped part 26' at the rear end 72, with the third row of rotor blades 56 projecting from the conical outer shaped part 26'.
  • the dynamic mixers 10 shown in Figs. 3 and 5 each comprise three rows of rotor blades 28, 30, 56, with the first and second row of rotor blades 28, 30 comprising the same number of rotor blades 28', 30' and the third row of rotor blades 56 comprising less rotor blades 56' than either of the first and second rows of rotor blades 28, 30.
  • first and second rows of rotor blades 28, 30 may each comprise between 10 and 20, preferably between 12 and 16, especially 14 rotor blades 28', 30' and the third row of rotor blades 56 may comprise between 5 and 9, preferably between 6 and 8 and especially 7, rotor blades 56'.
  • the rotor body 26 is journaled at the base part 34 of the housing 32 via two annular projections 76, 78 respectively engaging ring-shaped grooves 80, 82 present in the rotor body 26.
  • the first annular projection 76 is generally rectangular in shape and projects into the first ring-shaped groove 80.
  • the second annular projection 78 tapers towards the longitudinal axis A and thereby engages a sidewall of the second ring-shaped groove 80. In this way a seal is formed between the rotor body 26 and the base part 34 of the housing 32 in order to avoid multi-component material from exiting the dynamic mixer 10 in the region of the coupling 24.
  • Fig. 5 shows a schematic top view of the dynamic mixer of Fig. 4 with the top part 36 of the housing 32 removed.
  • each of the mixer entry openings 46 has a shape resembling the ring shaped section 62 perpendicular to the longitudinal axis A.
  • the area of the mixer entry openings 46 is larger than the open area 58 between directly adjacent rotor blades 28' of the first row of rotor blades 28, the rotor body 26 and the housing 32.
  • Fig. 6 shows a perspective part sectional view of a further type of dynamic mixer 10.
  • the design differs with regard to the design shown in Figs. 1 to 5 .
  • the differences are due to the different design of mixing element 20 which will be discussed in the following and due to the difference in design of the housing 32.
  • the housing 32 is a two-part housing comprising the top part 36 and the base part 34.
  • a collar 36' of the top part 36 engages over a ring-shaped projection 34" of the base part 34 and engages a nose 34' of the base part 34 to bring about a seal between the top and bottom parts 36, 34 of the housing 32.
  • the housing 32 also comprises wings 84.
  • the wings 84 are provided to stiffen the housing 32 from the outside in order to maintain the seal between the top and bottom parts 36, 34 of the housing 32.
  • Fig. 7 shows a top view of the dynamic mixer of Fig. 6 .
  • wings 84 are provided.
  • the designs of Figs. 1 to 5 do not show wings 84, it should however be noted that also the designs of Figs. 1 to 5 could have wings 84 provided on the outside of the top part 36 of the housing 32. Generally speaking between 3 and 10 such wings 84 can be provided.
  • Fig. 8 shows a sectional view of the dynamic mixer of Fig. 6 taken along the sectional line A:A of Fig. 7 .
  • the mixing element 20 comprises four rows of rotor blades 28, 30, 56, 86 arranged one after another and projecting radially from the rotor body 26 away from the longitudinal axis A between the rotor body 26 and the housing 32 accommodating the mixing element 20 of the dynamic mixer 10.
  • the rotor body 26 decreases in size from the inlets 12 towards the outlet 16 at the position of each of the rotor blades 28', 30', 56', 86' of each of the four rows of rotor blades 28, 30, 56, 86.
  • Each row of rotor blades 28, 30, 56, 86 is thus arranged at a different axial position along the longitudinal axis A of the mixing element 20.
  • Four rows of stator blades 48', 50', 68, 88 are arranged at the inner surface 52 of the housing 32.
  • the four rows of stator blades 48', 50', 68, 88 are arranged in alternating arrangement with said four rows of rotor blades 28, 30, 56, 86.
  • the alternating arrangement starting at the mixer entry opening 46 is the first row of rotor blades 28 followed by the first row of stator blades 48', followed by the second row of rotor blades 30 followed by the second row of stator blades 50' followed by the third row of rotor blades 56, followed by the third row of stator blades 68, followed by the fourth row of rotor blades 86, followed by the fourth row of stator blades 88.
  • the fourth row of rotor blades 86 comprises less rotor blades 86' than either of the first, second or third row of rotor blades, 28, 30, 56. It may be the case that half as many rotor blades 86' are provided as in the first, second or third row of rotor blades, 28, 30, 56.
  • An outer diameter of the rotor body 26 reduces in size between each of the four rows of rotor blades 28, 30, 56, 86, such that the rotor body 26 decreases in size between the inlets 12 and the outlet 16.
  • Each of the rotor blades 28', 30', 56', 86' of each of the four rows of rotor blades 28, 30, 56, 86 comprises a vertical wall 90 that extends in parallel with the longitudinal axis A and a top wall 92 that extends inclined with the vertical wall 90.
  • the angle of inclination between the top wall 92 and the vertical wall 90 may generally be selected in the range of 10 to 80° and in the example shown in Fig. 8 is 30°.
  • Each stator blade 48, 50, 68', 88' of the four rows of stator blades 48', 50', 68, 88 has a bottom wall 94 that extends in parallel with the top wall 92 and a side wall 96 that extends in parallel with the longitudinal axis A.
  • the angle of inclination between the bottom wall 94 and the side wall 96 may generally be selected in the range of 100 to 170° and in the example shown in Fig. 8 is 120°.
  • the respective axial gap thus extends between the side walls 96 and the vertical walls 90.
  • the respective radial gap thus extends between the top walls 92 and the bottom walls 94.
  • Each of the inlets 12 is formed by the passage 42.
  • the respective inlet opening 44 and the mixer entry opening 46 are arranged in parallel to one another and to to the outlet opening 54 of the outlet 16.
  • stator blades 48, 50, 68', 88' may be arranged in each row of stator blades 48', 50', 68, 88.
  • stator blades 48, 50, 68', 88' are provided than rotor blades 28', 30', 56', 86'.
  • Fig. 9 shows a schematic view of a dispensing assembly 98.
  • the dispensing assembly comprises a dispenser 100, a cartridge 102, filed with a multi-component material M, M', received in the dispenser 100 and a dynamic mixer 10.
  • the dispenser 100 comprises the drive shaft 22 that can be coupled to the coupling 24 of the mixing element 20 of the dynamic mixer 10 to drive the mixing element 20 about the longitudinal axis A of the mixing element 20 on dispensing said multi-component material M, M' from said cartridge.
  • the dispenser 100 further comprises a motor 104 to drive the drive shaft 22 and a receptacle 106 configured to receive the multi-component cartridge 102.
  • the mixing element 20 is rotated while the flow of material is guided through the dynamic mixer 10 in order to constantly move slices of the flow of material of the respective components of the multi-component material M, M' not only in the direction of the outlet 16, but also in a radial direction, so that the different slices of components of the multi-component material M, M' come into contact with one another and are thereby mixed prior to exiting the outlet 16.
  • a diameter of the flow of material is expanded in the direction towards said mixing element 20 of the dynamic mixer 10 between the inlets 12 and the mixing element 20, in order to reduce the flow speed of the multi-component material M, M' for an improvement of the mixing quality.
  • passages 74 are provided between different rows of rotor blades 30, 56, these can further improve the mixing results of the mixed multi-component material M, M' as the flow of material can be interrupted at further dedicated positions introducing further vortices to bring about a momentary stop of the flow of the multi-component material M, M' which ensures an improved through mixing of the multi-component material M, M'.
  • the dynamic mixers 10 taught in the foregoing may be formed e.g. in an injection molding process or using a 3D printer from a plastic material. This means that the housing 32 and the mixing element 20 are each formed from a plastic material.
  • the material of the mixing element 20 may be selected harder than a material of the housing 32.
  • the base part 34 and the top part 36 of the housing may be formed from the same material or a different material.
  • a material of the mixing element 20 and hence that of the rotor blades 28', 30', 56', 86' of the mixing element 20 and/or a material of the housing 32 and hence that of the stator blades 48, 50, 68', 88' can be selected having a SHORE D hardness in the range of 50 to 90, preferred materials for these components are Polypropylene (PP) and Polyoxymethylene (POM) and hence the preferred range of the SHORE D hardness is selected in the range of 60 to 88.
  • PP Polypropylene
  • POM Polyoxymethylene

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (15)

  1. Dynamischer Mischer (10) mit zwei oder mehr Einlässen (12), die an einer Einlassseite (14) des dynamischen Mischers (10) angeordnet sind, und einem Auslass (16), der an einer Auslassseite (18) des dynamischen Mischers (10) angeordnet ist, wobei ein Mischelement (20) des dynamischen Mischers (10) zwischen den zwei oder mehr Einlässen (12) und dem Auslass (16) vorgesehen und dazu ausgebildet ist, über eine Kupplung (24) mit einer Antriebswelle (22) gekoppelt zu werden, um das Mischelement (20) um eine Längsachse (A) des Mischelements (20) anzutreiben, wobei das Mischelement (20) einen Rotorkörper (26) und zwei oder mehr Reihen von Rotorschaufeln (28, 30, 56, 86) umfasst, die radial vom Rotorkörper (26) weg von der Längsachse (A) zwischen dem Rotorkörper (26) vorstehen, wobei eine erste Reihe von Rotorschaufeln (28) näher an den zwei oder mehr Einlässen (12) angeordnet ist als die zweite Reihe von Rotorschaufeln (30), wobei der dynamische Mischer (10) ferner ein Gehäuse (32) umfasst, das das Mischelement (20) aufnimmt, wobei ein Bereich zwischen zwei direkt benachbarten Rotorschaufeln (28') der ersten Reihe von Rotorschaufeln (28), dem Rotorkörper (26) und dem Gehäuse (32) ein offener Bereich (58) an einem Mischeinlassende (60) ist, wobei jeder der Einlässe (12) durch einen Durchgang (42) mit einer Einlassöffnung (44) und einer Mischereinlassöffnung (46) gebildet ist, wobei die Einlassöffnung (44) von den Rotorschaufeln (28, 30, 56, 86) entfernt ist und die Mischereinlassöffnung (46) direkt benachbart zu dem Mischeinlassende (60) und zu dem offenen Bereich (58), der zwischen Rotorschaufeln (28') der ersten Reihe von Rotorschaufeln (28) gebildet ist, angeordnet ist, wobei die Mischereinlassöffnung (46) einen Mischereinlassbereich (46') aufweist,
    dadurch gekennzeichnet, dass der Mischereinlassbereich (46') größer als der offene Bereich (58) ist.
  2. Dynamischer Mischer (10) nach Anspruch 1, wobei der Mischereinlassbereich (46') weniger als das Doppelte des offenen Bereichs (58) beträgt.
  3. Dynamischer Mischer (10) nach einem der Ansprüche 1 oder 2, wobei jeder Einlass (12) eine Querschnittsgröße und/oder -form hat, die sich zwischen der Einlassöffnung (44) und der Mischereintrittsöffnung (46) ändert, wobei die Einlassöffnung (44) optional eine kreisförmige Form hat.
  4. Dynamischer Mischer (10) nach Anspruch 3, wobei die Einlassöffnung (44) einen Einlassbereich aufweist, der kleiner ist als der Mischereinlassbereich der Mischereintrittsöffnung (46).
  5. Dynamischer Mischer (10) nach einem der Ansprüche 3 oder 4, wobei die Querschnittsgröße des Einlasses (12) zwischen der Einlassöffnung (44) und der Mischereintrittsöffnung (46) zunimmt, insbesondere kontinuierlich zunimmt.
  6. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, wobei die Einlassöffnung (44) parallel zu der Mischereintrittsöffnung (46) angeordnet ist, wobei optional die Einlassöffnung (44) und die Mischereintrittsöffnung (46) parallel zu einer Auslassöffnung des Auslasses (16) angeordnet sind.
  7. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, wobei die Mischereintrittsöffnung (46) in einem Querschnitt eine gekrümmte Form aufweist, wobei insbesondere die Mischereintrittsöffnung (46) entweder eine Bogenform oder eine Form aufweist, die einem ringförmigen Abschnitt (62) senkrecht zur Längsachse (A) ähnelt, wobei der ringförmige Abschnitt (62) innere und äußere gekrümmte Seitenflächen (64, 64') und planare Seitenflächen (66, 66') aufweist.
  8. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, wobei der Rotorkörper (26) drei oder vier oder mehr Reihen von Rotorschaufeln (28, 30, 56, 86) umfasst, die entlang der Längsachse (A) des Mischelements (20) hintereinander angeordnet sind, wobei die erste Reihe (28) der drei oder vier oder mehr Reihen von Rotorschaufeln (28, 30, 56, 86) direkt benachbart der Mischeingangsöffnung (46) angeordnet ist, die zweite Reihe (30) der drei oder vier oder mehr Reihen von Rotorschaufeln (28, 30, 56, 86) zwischen der ersten und der dritten oder vierten oder mehr Reihen von Rotorschaufeln (28, 56, 86) angeordnet ist und die dritte oder vierte oder weitere Reihe von Rotorschaufeln (56, 86) näher am Auslass (16) angeordnet ist als die erste Reihe von Rotorschaufeln (28).
  9. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, wobei eine Reihe von Statorschaufeln (48', 50', 68) zwischen mindestens einer der Reihen der zwei oder mehr Reihen von Rotorschaufeln (28, 30, 56, 86) angeordnet ist, wobei optional eine Reihe von Statorschaufeln (48', 50', 68) zwischen jeder Reihe der zwei oder mehr Reihen von Rotorschaufeln (28, 30, 56, 86) angeordnet ist, und/oder wobei optional Statorschaufeln (48, 50, 68', 88') an einer Innenfläche (52) des Gehäuses (32) angeordnet sind.
  10. Dynamischer Mischer (10) nach einem der Ansprüche 8 oder 9, wobei, wenn eine dritte und optional vierte Reihe von Rotorschaufeln (28, 30, 56, 86) vorgesehen ist, die dritte und optional vierte Reihe von Rotorschaufeln (56, 86) eine unterschiedliche axiale Position und/oder Außengröße entlang der Längsachse (A) des Mischelements (20) in Bezug auf die erste Reihe von Rotorschaufeln (28) aufweist.
  11. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, wobei der Rotorkörper (26) entlang der Längsachse (A) zwischen der ersten Reihe von Rotorschaufeln (28) und dem Auslass (16) im Durchmesser abnimmt.
  12. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, optional nach Anspruch 10, wobei der Rotorkörper (26) im Bereich der Mischereintrittsöffnung (46) ein vorderes Ende (70) und im Bereich des Auslasses (16) ein rückwärtiges Ende (72) aufweist, wobei der Rotorkörper (26) an seinem hinteren Ende eine konische Außenform aufweist, von der Rotorschaufel (56) abstehen, optional mit dritten und/oder vierten Reihen von Rotorschaufeln (56, 86), die von ihm abstehen.
  13. Dynamischer Mischer (10) nach einem der vorhergehenden Ansprüche, optional nach einem der Ansprüche 8 bis 12, wobei die Kupplung (24) am oder im Rotorkörper (26) ausgebildet ist; und/oder
    wobei die erste Reihe von Rotorschaufeln (28) mehr Rotorschaufel (28') umfasst als die dritte Reihe von Rotorschaufeln (56), und/oder
    wobei in der dritten Reihe von Rotorschaufeln (56) weniger Rotorschaufel (56'), insbesondere halb so viele Rotorschaufel (56'), vorgesehen sind wie Rotorschaufel (28') in der ersten Reihe von Rotorschaufeln (28) vorgesehen sind, wobei optional in der zweiten Reihe von Rotorschaufeln (30) so viele Rotorschaufel (30') vorgesehen sind wie in der ersten Reihe von Rotorschaufeln (28) vorgesehen sind; und/oder
    wobei weniger Statorschaufeln als Rotorschaufeln (28', 30', 56', 86') vorgesehen sind oder wobei die gleiche Anzahl von Statorschaufeln wie Rotorschaufeln (28', 30', 56', 86') vorgesehen ist; und/oder
    wobei eine Höhe parallel zur Längsachse (A) der ersten Reihe von Rotorschaufeln (28) mindestens 5 mm, vorzugsweise mindestens 6 mm beträgt; und/oder
    wobei eine Höhe der unmittelbar benachbart einer Rotorschaufel (28', 30', 56', 86') angeordneten Statorschaufeln geringer ist als eine parallel zur Längsachse (A) gemessene Höhe der Rotorschaufeln (28', 30', 56', 86').
  14. Abgabeanordnung (98), umfassend eine Abgabevorrichtung (100), eine Kartusche (102), die optional mit einem Mehrkomponentenmaterial (M, M') gefüllt ist und in der Abgabevorrichtung aufgenommen ist, und einen dynamischen Mischer (10) nach einem der vorhergehenden Ansprüche, wobei die Abgabevorrichtung (100) eine Antriebswelle (22) umfasst, die mit dem Mischelement (20) des dynamischen Mischers (10) gekoppelt werden kann, um das Mischelement (20) beim Abgeben des Mehrkomponentenmaterials (M, M') aus der Kartusche (102) um eine Längsachse (A) des Mischelements (20) anzutreiben.
  15. Verfahren zur Abgabe von Mehrkomponentenmaterial (M, M') aus einer Kartusche unter Verwendung eines dynamischen Mischers (10), optional des dynamischen Mischers (10) nach einem der Ansprüche 1 bis 13, wobei das Verfahren die Schritte umfasst:
    Bereitstellen einer jeweiligen Komponente eines Mehrkomponentenmaterials (M, M') an den Einlässen (12) des dynamischen Mischers (10);
    Leiten der jeweiligen Komponente des Mehrkomponentenmaterials (M, M') zu einem Mischelement (20) des dynamischen Mischers (10) über die Einlasse (12) des dynamischen Mischers (10) als Materialstrom;
    Vergrößern eines Durchmessers des Materialstroms in Richtung des Mischelements (20) des dynamischen Mischers (10) zwischen den Einlassen (12) und dem Mischelement (20) während des Schritts zum Leiten der jeweiligen Komponente über die Einlässe (12).
EP20713897.5A 2019-03-29 2020-03-27 Dynamischer mischer, abgabeanordnung und verfahren zur abgabe von mehrkomponentenmaterial aus einer kartusche Active EP3921071B1 (de)

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EP19166086.9A EP3714967A1 (de) 2019-03-29 2019-03-29 Dynamischer mischer, abgabeanordnung und verfahren zur abgabe von mehrkomponentenmaterial aus einer kartusche
PCT/EP2020/058644 WO2020201044A1 (en) 2019-03-29 2020-03-27 Dynamic mixer, dispensing assembly and method of dispensing multi-component material from a cartridge

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EP20713897.5A Active EP3921071B1 (de) 2019-03-29 2020-03-27 Dynamischer mischer, abgabeanordnung und verfahren zur abgabe von mehrkomponentenmaterial aus einer kartusche

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