Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C9/00—Impression cups, i.e. impression trays; Impression methods
  • A61C9/0026—Syringes or guns for injecting impression material; Mixing impression material for immediate use
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
  • A61C5/62—Applicators, e.g. syringes or guns
  • A61C5/64—Applicators, e.g. syringes or guns for multi-component compositions
• • 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
  • B01F27/05—Stirrers
  • B01F27/07—Stirrers characterised by their mounting on the shaft
  • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
  • B01F27/0722—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis perpendicular with respect to the rotating axis
• • 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
  • B01F27/05—Stirrers
  • B01F27/07—Stirrers characterised by their mounting on the shaft
  • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
  • B01F27/0724—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis directly mounted on the rotating axis
• • 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
  • B01F27/05—Stirrers
  • B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
  • B01F27/092—Stirrers characterised by the mounting of the stirrers with respect to the receptacle occupying substantially the whole interior space of the receptacle
• • 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
  • B01F27/05—Stirrers
  • B01F27/11—Stirrers characterised by the configuration of the stirrers
  • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
  • B01F27/1121—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades pin-shaped
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
  • B01F33/50—Movable or transportable mixing devices or plants
  • B01F33/501—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use
  • B01F33/5011—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held
• • 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
  • B01F35/71—Feed mechanisms
  • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
  • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
• • 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
  • B01F35/75—Discharge mechanisms
  • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
  • B01F35/7547—Discharge mechanisms characterised by the means for discharging the components from the mixer using valves, gates, orifices or openings
• • 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
  • B01F35/80—Forming a predetermined ratio of the substances to be mixed
  • B01F35/896—Forming a predetermined ratio of the substances to be mixed characterised by the build-up of the device
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
  • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
  • B05C17/00553—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with means allowing the stock of material to consist of at least two different components
  • B05C17/00566—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with means allowing the stock of material to consist of at least two different components with a dynamic mixer in the nozzle
• • 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
  • B01F2101/19—Mixing dentistry compositions
• • 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
• • 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

Definitions

• the invention relates to a dynamic mixer according to the preamble of claim 1.
• WO 2007/041878 by the same Applicant discloses a dynamic mixer for mixing components having different proportions by volume, in particular for producing impression materials for dental impressions.
• a pre-chamber is arranged, within which the mixing rotor has a distributor body for distributing the components about its axis of rotation, thereby achieving a correct mixing ratio between the components and to avoid air pockets. Subsequently, the premixed components reach their complete mixing through at least one passage opening in a main chamber.
• the purpose of a subdivision into two separate mixing chambers is that in the antechamber already a global homogenization of the component mixture is to be achieved, while then takes place in the main chamber local homogenization. Because the mixing of two or more components requires a uniformly punctual distribution of the components over the entire flow cross-section both at the global level and at the local level the lowest possible local deviation from the mean concentration.
• the distributor body provides an enlargement of the distribution surface for the components whose expansion is essential for the premixing of the components on a global level, the Surface magnification limited due to the geometric constraints along the rotor axis.
• the residence time within the prechamber can be influenced only by a selected dimensioning of the passage opening.
• DE 100 15 133 C1 discloses a further dynamic mixer with a dome-shaped first mixing blade arranged in the front chamber section, which has recesses functioning as passages and which extends in its outer radial section along a funnel-shaped inner wall of the housing. Axially behind a second mixing blade with passages is arranged such that the passages of a mixing blade are covered by the respective non-free part of the other mixing blade. This ensures that material not detected by the first mixing blade is detected with high probability by the second mixing blade.
• the invention has the object of developing a dynamic mixer of the type mentioned in such a way that while avoiding the aforementioned disadvantages, a precise concentration control of the supplied components is guaranteed even under temporary concentration fluctuations thereof at the same time high degree of homogenization at the global and local level, with his Length should be minimized by increased efficiency by at least one mixing stage.
• the stated object is achieved by a dynamic mixer according to claim 1. Due to the circumferential arrangement of isolated passageways according to the invention, the volume flow between the antechamber and the main chamber controlled only in these local areas instead. This results in a prolonged dwell time of the components in the antechamber, so that temporary Concentration fluctuations of the supplied components are compensated.
• the volume flow between the prechamber and the main chamber is made possible only during a temporary surface overlap between the rotating passage openings and the individual passages.
• FIG. 1 shows a side view of a dynamic mixer according to the invention, wherein the housing is shown in an axial partial section;
• Fig. 2 is a front view of the dynamic mixer shown in Fig. 1;
• Fig. 3 The front view of the dynamic mixer shown in Fig. 2 with the lid of the housing removed;
• Fig. 4 The front view of the dynamic mixer shown in Fig. 3, with the rotor removed from the housing;
• Fig. 5 A rear view of the in Figs. 1 to 4 shown dynamic mixer
• Fig. 6 A perspective view of the in the
• Figg. 1-5 shown dynamic mixer
• Fig. 7 An exploded view of the in Figs. 1-6 shown dynamic mixer.
• a in Figs. 1-7 shown dynamic mixer 1 comprises a housing 2 with a housing body 3, the front side by a lid 4 is sealingly closed.
• the lid 4 has a cylindrical outer and inner walls 6 and 7 with mutual radial spacing, into which engages a cylindrical sealing lip 5 provided on the front side in the housing body 3.
• annular recesses 8a, 8b are provided, in the corresponding along the inside of the outer wall 6 of the lid 4 formed projections engage positively.
• a circular disk-shaped front wall 9 of the lid 4 has a concentric rotor opening 10, the outside of a cylindrical receptacle 11 with slightly larger Inner diameter is outlined.
• an inlet opening 12, 13 for the components to be mixed in the front wall 9 of the lid 4 is located on two opposite sides next to the rotor opening 10.
• the inlet openings 12, 13 have different sizes, the inlet opening 12 having the smaller diameter for supplying a Component is provided with a lower volume fraction when mixing the components.
• the inlet openings 12, 13 are on the cover side of each of a cylindrical receptacle 14, 15 for
• the inner diameter of the receptacle 14 has a larger inner diameter than the small inlet opening 12, while the large inlet opening 13 and the inner diameter of their receptacle 15 are equal.
• a conically tapered transition section 16 closes in the housing body 3.
• the inner space bounded by the inner walls of the cover 4 and the transitional portion 16 forms an antechamber 17, within which takes place a premixing of the components with respect to a global homogenization of the mixture.
• the transitional section 16 terminates in an axially extending short cylinder section 18 of the housing body 3. Behind the short cylinder section 18 adjoins an abrupt step-shaped taper, a long cylinder section 19 with a smaller inner diameter. At the far end of the long
• Cylinder portion 19 a cylindrical outlet opening 20 is arranged after a further conical taper 21.
• the interior of the housing body 3, by the inner side edge 16a of the transition section 16 and bounded by the inner walls of the short and long cylinder sections 18 and 19 corresponds to a main chamber 22 for mixing the components at the local level.
• the depressions 23a-d extend radially obliquely rearwardly along their length substantially over the entire transitional portion, adjoining an outer side edge 16c of the transitional portion 16 at their front closed end and open at their rearward end in the region of the inner lateral edge 16a so that they open from the antechamber 17 into the main chamber 22.
• the width of the depressions 23a-d extends only over a partial circumference of the transitional section 16. In this case, adjacent depressions 23a-d in the circumferential direction of the transitional section 16 each have the same spacing.
• the described housing 2 has a length of about 6 cm and on its front side a width of about 4 cm and consists of injection-molded plastic.
• a rotor 30 is arranged in the housing 2.
• the rotor 30 has a rotor axis 31 which, through the rotor opening 10 and the cylindrical receptacle 11 in the front wall 9 of the Cover 4 protrudes and can be coupled at its front free end 32 to a mixer drive shaft.
• a rear mixing blade 33 is arranged on the rotor axis 31.
• the inner wing portion 34 of the rear mixing blade 33 is in the form of a radially extending, flat circular disk, which is arranged concentrically around the rotor axis 31.
• An outer wing section 35 adjoins the outer circumference of the inner wing section 34 and comprises four wing leaves 36a-d, each of which has substantially the shape of a curved circular ring segment.
• the vane blades 36a-d are uniformly spaced and, starting radially from the inner vane section 34, are inclined towards the front so that the outer vane section 35 has a radially inwardly directed counterbore on its inlet side. Due to the disc shape thus achieved, the rear mixing blade 33 serves as a temporary catch basin during the concentration control and premixing process of the components.
• a swirling element 37a-d is arranged in the form of an axial pin-shaped projection.
• the two side edges 38a, b of each of the blades 36a-d are chamfered toward the rear.
• the outer contour of the rear mixing blade 33 thus formed is adapted to the inner wall 16b of the transition section 16, wherein the inclination and length of the blades 36a-d substantially corresponds to that of the inner wall 16b of the transition section 16 and the short cylinder section 18 arranged behind it substantially coincides with the inner wing section 34 in its radial cross section.
• a sealing of the pre-chamber 17 is achieved by the main chamber 22, so that a passage of the components only through the through-holes 39a-d and arranged behind the individual channels 23a-d.
• the width of the passage openings 39a-d and the width of the individual channels 23a-d have approximately the same order of magnitude, wherein the passage openings 39a-d are preferably slightly wider.
• a minimal axial spacing between the inner wall 16b of the transition section 16 and the rear mixing blade 33 avoids a strong juxtaposition of these elements during rotation of the axis 31 and material scraps along the inner wall caused by a wall conductance of the mixing blade.
• the rotor 30 includes within the antechamber 17 in the axial direction in front of the rear mixing blade 33, a front mixing blade 40.
• the front mixing blade 40 consists of four substantially strip-shaped mixing blades 41 a-d.
• the mixing vanes 41a-d extend radially from the rotor axis 31 with a length which, viewed radially, reaches the outer circumference of the rear mixing blade 33 arranged behind it. They border from the inside to the inner wall 7 of the lid 4, without being wall-going.
• the mixing vanes 40a-d are respectively arranged in front of the passage openings 39a-d, so that their axial projection surface projects into one of the through-openings 39a-d in each case.
• the width of the mixing vanes 40a-d is less than the width of the through openings 39a-d, so that the through openings 39a-d are not covered, as can be seen in particular in the front view in Fig. 3.
• the axial cross-sectional area of the mixing vanes 40a-d has a trapezoidal shape, wherein axially extending sides of a respective vane blade 41a-d are formed obliquely in such a way that they have a pitch in the direction of rotation R of the mixing vane.
• the rear side is formed less rising and larger area.
• the rotor 30 has five further mixing vanes 42a-d, 43. At the end of the short
• Cylinder portion 18 of the mixing blade 43 is arranged, which laterally and rearwardly adjacent to the step-shaped taper between the short cylinder portion 18 and the long cylinder portion 19 without being wall-going.
• the mixing blade 43 consists of four wing blades 44a-d which are of square design essentially in their radial cross-section and which are circumferentially arranged in each case in an area in which the rear mixing blade 33 in the pre-chamber 17 has the through-openings 39a-d.
• the blade blades 44a-d do not protrude beyond the outer circumference of the inner wing portion 34 of the rear mixing blade 33 in the radial direction.
• the blades 44a-d are connected to each other in their initial section.
• each blade of the mixing vanes 42a-d is provided with four blades. All blades of the mixing vanes 42a-d are identical and have a substantially serrated radially Shape, which is rounded on the front in the direction of rotation R side. In the axial direction they are longer than the blades 44a-d formed.
• the blades of the mixing vanes 42a-d are adjacent to the inner wall of the long cylinder portion 19 without being wall-mounted. In this case, they are arranged circumferentially aligned with respect to the blades of subsequent mixing blades 42a-d, wherein the arrangement in each case extends behind one of the blades 44a-d of the mixing blade 43.
• Four axially extending, elongated projections of the rotor axis 31 extend from the back of the rear mixing blade 33 through the respective blades 44a-d to the respective blades of the foremost of the mixing blades 42a-d.
• the component with the smaller volume fraction is forced through the small inlet opening 12 and the component with the higher volume fraction through the large inlet opening 13 into the pre-chamber 17.
• a first turbulence in particular of the component with the smaller volume fraction is effected, after which the components impinge on the plate-like surface of the rear mixing blade 33.
• the discharge of the components from the pre-chamber 17 into the main chamber 22 is delayed.
• the residence time of the components on the plate-like surface of the rear Mischulatels 33 almost infinitely adjustable over a wide range. This can be achieved, for example, that at the beginning of the mixing process, the pre-chamber must first be almost completely filled with the supplied components before the components get into the main chamber.
• the concentration of the respective components of the mixture is controlled in this period with a high accuracy and simultaneously carried out a premix, so as to achieve a global homogenization of the mixture.
• the latter is improved in particular by the elements 37a-d on the wing blades 36a-d, which cause turbulence of the components or the premix during the movement along the surface of the rear mixing blade 33.
• the shearing action of the front mixing blade 40 with the chamfered axial side edges of its mixing vanes 41a-d contributes to the premixing process. Since its axial projection surface projects into a respective through-opening 39a-d of the rear mixing blade 33, the supplied components are prevented from penetrating directly into the through-openings 39a-d without being applied to the outer or inner wing section 35 or 34.
• the larger-area, rear side edge of the mixing vanes 41a-d also ensures a diversion of the premixed mass in the direction of the through-openings 39a-d and for a supply to the individual channels 23a-d.
• the number of individual channels 23a-d need not necessarily correspond to the number of through-openings 39a-d in order to obtain the desired residence time of the mixture in the prechamber 17.
• the transition section 16 can not be realized as an integral part of the housing 2. For example, this may also be a distally tapered element in the interior of the housing 2.
• the individual channels 23a-d and / or the through-openings 39a-d vary in width, in particular have an increasing or decreasing width along the transition section 16, so as to regulate the desired volume flow from the pre-chamber 17 into the main chamber 22 , Likewise, their depth may vary.
• the individual channels 23a-d in addition to their radially to the center and obliquely rearward expansion also have a circumferential inclination along the transition section 16, so that the volume flow the components of the pre-chamber 17 in the main chamber 22 in addition to a central and a circumferential direction component.
• volume fraction more than just another component with a smaller volume fraction are mixed. In this case, it requires a further inlet in the front wall 9 of the lid 4. Furthermore, the design of the dynamic mixer 1 also brings advantages, if the
• Components have the same mixing ratio, with equal inlet openings 12, 13 are provided.
• the length of the mixer housing 2 may vary depending on the type and number of components to be mixed and the number of mixing stages to be provided. For example, in the case of a mixer for the production of impression materials for dental impressions, a total length of between 3 cm and 10 cm is conceivable.

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• Chemical Kinetics & Catalysis (AREA)
• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Epidemiology (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dentistry (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mixers Of The Rotary Stirring Type (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Engine Equipment That Uses Special Cycles (AREA)

Priority Applications (12)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (15)

Cited By (9)

Families Citing this family (26)

Citations (8)

Family Cites Families (9)

• 2008
  • 2008-06-06 SG SG2012064440A patent/SG184713A1/en unknown
  • 2008-06-06 CN CN200880106246XA patent/CN101801511B/zh active Active
  • 2008-06-06 KR KR1020107005313A patent/KR101517454B1/ko active Active
  • 2008-06-06 AU AU2008297444A patent/AU2008297444B2/en not_active Ceased
  • 2008-06-06 DK DK08760623.2T patent/DK2190563T3/da active
  • 2008-06-06 AT AT08760623T patent/ATE526075T1/de active
  • 2008-06-06 EP EP08760623A patent/EP2190563B1/de active Active
  • 2008-06-06 WO PCT/EP2008/057049 patent/WO2009033832A1/de not_active Ceased
  • 2008-06-06 CA CA2698840A patent/CA2698840C/en not_active Expired - Fee Related
  • 2008-06-06 US US12/676,466 patent/US8651731B2/en active Active
  • 2008-06-06 RU RU2010114215/05A patent/RU2464077C2/ru not_active IP Right Cessation
  • 2008-06-06 BR BRPI0817218A patent/BRPI0817218B8/pt active IP Right Grant
  • 2008-06-06 JP JP2010523447A patent/JP5389032B2/ja active Active
  • 2008-06-06 PL PL08760623T patent/PL2190563T3/pl unknown
• 2010
  • 2010-03-04 IL IL204290A patent/IL204290A/en not_active IP Right Cessation

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