EP0515852A1 - Dispositif de mélange - Google Patents

Dispositif de mélange Download PDF

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Publication number
EP0515852A1
EP0515852A1 EP92107225A EP92107225A EP0515852A1 EP 0515852 A1 EP0515852 A1 EP 0515852A1 EP 92107225 A EP92107225 A EP 92107225A EP 92107225 A EP92107225 A EP 92107225A EP 0515852 A1 EP0515852 A1 EP 0515852A1
Authority
EP
European Patent Office
Prior art keywords
stirring
stirring blades
stirring device
blades
stirrer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92107225A
Other languages
German (de)
English (en)
Other versions
EP0515852B1 (fr
Inventor
Peter Dipl.-Ing. Forschner
Rainer Dr.-Ing. Krebs
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.)
EKATO Ruehr und Mischtechnik GmbH
Original Assignee
EKATO Ruehr und Mischtechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EKATO Ruehr und Mischtechnik GmbH filed Critical EKATO Ruehr und Mischtechnik GmbH
Publication of EP0515852A1 publication Critical patent/EP0515852A1/fr
Application granted granted Critical
Publication of EP0515852B1 publication Critical patent/EP0515852B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B01F27/0727—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by two or more radial rods, e.g. the shaft being interrupted between the rods, or of crankshaft type
    • 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
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction

Definitions

  • the invention relates to a stirring device, in particular for mixing liquids in a stirring container, consisting of a motor-driven stirrer shaft, on which at least one stirring element is arranged, which in particular has two stirring blades connected to the shaft.
  • stirrers with bar-shaped blades are usually used which are remote from the wall.
  • increasing viscosity not all zones in the container are affected equally well by the now laminar flow with these stirring elements. A considerable increase in the mixing time is therefore observed in the laminar region.
  • agitators close to the wall such as spiral or screw agitators with axial conveying components.
  • stirrer When transferring heat between the container wall and the fluid, it is the task of the stirrer to destroy the boundary layer near the wall. In the case of liquids of moderate viscosity, this is done with agitators remote from the wall due to turbulence which is generated by the agitator blade and transported from there to the container wall. However, this mechanism fails with higher viscosity media. For this reason, stirring elements are mainly used for heat transfer in the laminar area.
  • a suitable stirrer for achieving high heat transfer coefficients is, for example, the anchor stirrer. As a result of the lack of axial intermixing, however, large uneven temperature distributions can occur, which is why this stirrer can only be used to a limited extent.
  • the kink of the mixing time characteristic can lead to small Reynolds numbers, i.e. higher viscosities, are shifted by increasing the diameter of the stirrer and / or increasing the number of stages.
  • Disadvantages here are the numerous holders required for the individual segment sheets, a high use of material and product deposits when emptying the containers on the segment sheets.
  • the invention is therefore based on the object of developing a stirring device of the type mentioned in such a way that the mixing is improved with a construction which is as simple as possible in terms of production technology and reasonable use of materials.
  • each of the two stirring blades is designed in the form of a flat elliptical ring segment.
  • Each of the two stirring blades is preferably delimited by two concentric semi-ellipses.
  • the stirring blades can be connected to the shaft at their upper and / or at their lower ends by spars extending transversely to the axis of the stirring shaft, wherein a bottom stirring blade can expediently be arranged between the lower ends of the stirring blades and connects the lower ends of the stirring blades and that for example in the form of a circular ring segment.
  • the bottom stirring blade lies in a plane that runs through the central axis of the stirrer shaft, i.e. in a vertical plane with the vertical axis of the stirrer shaft.
  • the two stirring blades consisting of flat elliptical ring segments preferably cross each other - seen in a direction transverse to the spar connecting them - and their planes run perpendicular to a plane which runs through the central axis of the stirrer shaft and the central axis of the spar connecting the stirring blades with the stirrer shaft .
  • the pitch angle ⁇ between the spar and the respective stirring blade is expediently in a range from approximately 35 ° to 75 °.
  • the width of the stirring blades at the narrowest point in their center is advantageously about 8 to 12%, in particular about 10%, of the inside diameter of the stirring vessel diameter.
  • the stirring element can be formed from three stirring blades, which are installed offset from one another in the circumferential direction at an angle of 120 °.
  • a plurality of stirring elements can also be arranged one above the other and at an angle of e.g. 90 ° to each other.
  • FIG. 1 shows a motor-driven stirrer shaft 14 which, as shown in FIG. 7, is preferably installed vertically in a stirred tank 12.
  • a stirrer 16 is fastened by means of a spar 20 extending transversely to the axis of the stirrer shaft 14, which is formed from two stirring blades 18 and a bottom stirring blade 22.
  • the stirring blades 18 are flat and they have the shape of elliptical annular segments that extend over a circumferential angle of e.g. Extend 180 °, but can certainly also extend over a smaller or larger circumferential angle.
  • the inner and outer peripheral edge of each stirring blade 18 is formed by part of an ellipse, in particular a semi-ellipse, and both ellipses, that is to say the inner and outer periphery of the stirring blades 18, have the same center.
  • the two stirring blades 18 are connected by the bottom stirring blade 22, which is also flat and has the shape of a circular ring segment, for example.
  • the bottom stirring blade 22 lies in relation to the usual working position of the stirring device, i.e. with vertical shaft 14, in a vertical plane, for example in a plane which runs through the central axis of the stirrer shaft 14 or also in a vertical plane offset from it.
  • FIG. 2 shows the manner of determining the shape of the stirring blades 18.
  • a plane is placed at an acute angle relative to the longitudinal center axis of the cylinder 24 through a tubular cylinder 24 with a circular cylindrical outer wall and a circular cylindrical inner wall.
  • the intersection of this plane with the wall of the tubular cylinder 24 is an elliptical ring 42 which is delimited on the inside by an ellipse 44 and on the outside by an ellipse 46, both ellipses having the same center 48.
  • the stirring blades 18 shown in FIG. 1 are formed, which have ends 50, as shown in FIG. 7 shows, are appropriately rounded.
  • the stirring blades 18 have their smallest width in their middle 26 between their ends 50, which is about 8 to 12%, preferably about 10%, of the inside diameter of the stirring container 12.
  • the stirring blades 18 At their ends 50, the stirring blades 18 have their greatest width, which is approximately 1.0 to 4.0 times the width at the narrowest point in the middle of the stirring blades.
  • the stirring blades 18 according to FIG. 1 are thus limited by two concentric semi-ellipses.
  • the stirring element 16 is connected to the stirrer shaft 14 only at the upper ends 50 of the two stirring blades 18 via the spar 20. It is not necessary to pass the stirrer shaft downwards, since the two stirring blades 18 are connected at their lower ends by the bottom stirring blade 22.
  • the two stirring blades 18 intersect and their planes are preferably perpendicular to a plane which runs through the central axis of the stirrer shaft 14 and the central axis of the spar 20.
  • stirring blades 18 can also be inclined to this aforementioned level.
  • FIG. 3 schematically shows the stirred tank 12 with a vertical stirrer shaft 14, the two stirrer blades 18 being connected to the stirrer shaft 14 at their upper and lower ends by a spar 20.
  • the bottom stirring blade 22 is also provided, which extends between the lower ends of the stirring blades 18 and with them or also directly is connected to the lower spar 20.
  • stirrer shaft 14 thus extends into the region of the lower ends of the stirring blades 18.
  • the stirring blades 18 are connected to the stirrer shaft 18 only at their upper ends by means of the spar 20, which here extends only as far as in FIG. 1 to the upper spar 20.
  • the lower ends of the stirring blades 18 are not connected to one another in this embodiment, but a supporting basket 32 known per se can be provided for the stirring blades for mechanical stiffening.
  • Baffles 30 protrude from the bottom of the stirred tank 12 into the stirred tank, which run, for example, vertically upward from the bottom.
  • the stirrer shaft 14 again extends into the region of the lower ends of the stirrer blades 18, which are connected to the stirrer shaft 14 via the lower spar 20.
  • the stirring blades 18 are not connected to one another at their upper ends, but a supporting basket 32 known per se can be provided for supporting the stirring blades 18 if necessary.
  • Baffles 28 protrude downward from the lid of the stirred container 12 into the stirred container, which can for example run parallel to the stirrer shaft 14.
  • FIG. 6 shows schematically a top view of a stirrer with, for example, three stirrer blades 18, which are each offset in the circumferential direction from one another by 120 °.
  • stirring device described here is not limited to two or three stirring blades per stirring element 16; more than three stirring blades and, if necessary, only one stirring blade can also be used.
  • the slope of the stirring blades can be chosen as desired and required and the angle ⁇ shown in FIG. 1 between the spar 20 and the plane of each of the stirring blades 18 is for example in the range from 35 to 75 °, preferably in the range from 40 to 70 °.
  • FIG. 7 shows schematically in section a stirred tank 12 with the stirrer shaft 14 preferably rotating around a vertical axis.
  • stirrer shaft 14 On the upper end of the stirred tank 12 there is a motor 34 which drives the stirrer shaft 14 via a gear 36, which is mounted in a bearing 38 at its upper end outside the stirred tank 12. The lower end of the stirrer shaft 14 is mounted in a shaft catch ring 40.
  • each stirring element 16 is mounted one above the other on the stirrer shaft 14, each of the two stirring elements 16 consisting of two stirring blades 18, which are designed in the manner described with reference to FIG.
  • the stirring blades of each stirring element 16 are connected to the stirrer shaft 14 at their upper and lower ends by means of spars 20, as is also shown in FIG. 3, for example.
  • the upper stirring element 16 in the drawing is installed offset by 90 ° in the circumferential direction to the lower stirring element 16.
  • the ratio of the axial height of a stirrer 16 to the inside diameter of the stirrer can be up to approximately 4, which corresponds to a pitch angle ⁇ of approximately 75 °.
  • the stirrer according to the invention makes it possible, even with an increasing gradient of the stirring blades, ie with less use of material, to enter enough power into the mixture to carry out the mixing task, the required mixing time not increasing even with higher slopes of the stirring blades. Because of the short distance to the wall, high heat transfer coefficients can be achieved between the container wall and the fluid in the container with good axial mixing.
  • the stirrer according to the invention has several advantages over conventional spiral stirrers or segment spiral stirrers, namely a lower use of material because of the relatively higher pitch of the stirring blades and a lower manufacturing outlay because the stirring blades are flat and have no torsion.
  • the stirrer according to the invention is easy to maintain, because due to the greater steepness of the stirring blades, hardly any residues remain after emptying the stirring container and the smooth, easily accessible surfaces of the stirring blades are easy to clean.
  • the stirrer according to the invention is also easy to assemble and disassemble, since the shape of the stirrer blades allows the number of screw connections to be reduced compared to conventional stirrers.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
EP92107225A 1991-05-31 1992-04-28 Dispositif de mélange Expired - Lifetime EP0515852B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4117773 1991-05-31
DE4117773A DE4117773A1 (de) 1991-05-31 1991-05-31 Ruehrvorrichtung

Publications (2)

Publication Number Publication Date
EP0515852A1 true EP0515852A1 (fr) 1992-12-02
EP0515852B1 EP0515852B1 (fr) 1995-07-12

Family

ID=6432823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107225A Expired - Lifetime EP0515852B1 (fr) 1991-05-31 1992-04-28 Dispositif de mélange

Country Status (3)

Country Link
EP (1) EP0515852B1 (fr)
AT (1) ATE124883T1 (fr)
DE (2) DE4117773A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010523332A (ja) * 2007-05-08 2010-07-15 ザ プロクター アンド ギャンブル カンパニー 液体組成物を混合及びスクリーニングする方法
DE102011018433A1 (de) 2011-04-20 2012-10-25 Ekato Systems Gmbh System zur Entleerung eines mit fließfähigem Medium gefüllten Behälters
EP2781254A1 (fr) * 2013-03-20 2014-09-24 Sidel S.p.a. Con Socio Unico Ensemble de réservoir d'agitation de fluide pour machine de remplissage de contenants et agitateur pour un tel ensemble de réservoir
CN109046090A (zh) * 2018-08-13 2018-12-21 高邮市新浪爱拓化工机械设备有限公司 一种具有多种工模模式的真空乳化装置
CN110621395A (zh) * 2017-05-10 2019-12-27 艾卡多搅拌及混合工程有限公司 搅拌元件装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004034395A1 (de) 2004-07-16 2006-02-16 Bayer Technology Services Gmbh Dynamischer Mischer
DE102008049265B4 (de) 2008-09-26 2012-12-13 Azo Holding Gmbh Mischer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212547A (en) * 1979-03-19 1980-07-15 Stoelting, Inc. Apparatus for blending fluid and soft particulate food constituents
FR2485390A1 (fr) * 1980-06-26 1981-12-31 Garap Dispositif d'homogeneisation de liquides et application de ce dispositif au traitement et a la cuisson de cruor provenant du sang d'animaux
US4478515A (en) * 1983-09-27 1984-10-23 Stone Construction Equipment, Inc. Mortar mixer with triple eight mixing action
US4610068A (en) * 1985-07-17 1986-09-09 Eastman Kodak Company Method for forming a ribbon blender
DE3815834A1 (de) * 1988-05-09 1989-11-23 Waldner Gmbh & Co Hermann Vorrichtung zum homogenen bewegen von guetern, insbesondere von scherempfindlichen guetern
US4887911A (en) * 1985-06-21 1989-12-19 Sharp Kabushiki Kaisha Developer mixer for electrophotographic copying machine
US5016053A (en) * 1985-11-29 1991-05-14 Sharp Kabushiki Kaisha Stirrer roller of developing device in electrophotographic copying machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212547A (en) * 1979-03-19 1980-07-15 Stoelting, Inc. Apparatus for blending fluid and soft particulate food constituents
FR2485390A1 (fr) * 1980-06-26 1981-12-31 Garap Dispositif d'homogeneisation de liquides et application de ce dispositif au traitement et a la cuisson de cruor provenant du sang d'animaux
US4478515A (en) * 1983-09-27 1984-10-23 Stone Construction Equipment, Inc. Mortar mixer with triple eight mixing action
US4887911A (en) * 1985-06-21 1989-12-19 Sharp Kabushiki Kaisha Developer mixer for electrophotographic copying machine
US4610068A (en) * 1985-07-17 1986-09-09 Eastman Kodak Company Method for forming a ribbon blender
US5016053A (en) * 1985-11-29 1991-05-14 Sharp Kabushiki Kaisha Stirrer roller of developing device in electrophotographic copying machine
DE3815834A1 (de) * 1988-05-09 1989-11-23 Waldner Gmbh & Co Hermann Vorrichtung zum homogenen bewegen von guetern, insbesondere von scherempfindlichen guetern

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010523332A (ja) * 2007-05-08 2010-07-15 ザ プロクター アンド ギャンブル カンパニー 液体組成物を混合及びスクリーニングする方法
DE102011018433A1 (de) 2011-04-20 2012-10-25 Ekato Systems Gmbh System zur Entleerung eines mit fließfähigem Medium gefüllten Behälters
WO2012143129A1 (fr) 2011-04-20 2012-10-26 Ekato Systems Gmbh Système pour vider un récipient rempli d'un milieu coulant
DE102011018433B4 (de) * 2011-04-20 2012-12-13 Ekato Systems Gmbh System zur Entleerung eines mit fließfähigem Medium gefüllten Behälters
EP2781254A1 (fr) * 2013-03-20 2014-09-24 Sidel S.p.a. Con Socio Unico Ensemble de réservoir d'agitation de fluide pour machine de remplissage de contenants et agitateur pour un tel ensemble de réservoir
CN110621395A (zh) * 2017-05-10 2019-12-27 艾卡多搅拌及混合工程有限公司 搅拌元件装置
CN110621395B (zh) * 2017-05-10 2022-07-26 艾卡多搅拌及混合工程有限公司 搅拌元件装置
CN109046090A (zh) * 2018-08-13 2018-12-21 高邮市新浪爱拓化工机械设备有限公司 一种具有多种工模模式的真空乳化装置
CN109046090B (zh) * 2018-08-13 2023-07-11 高邮市新浪爱拓化工机械设备有限公司 一种具有多种工作模式的真空乳化装置

Also Published As

Publication number Publication date
EP0515852B1 (fr) 1995-07-12
ATE124883T1 (de) 1995-07-15
DE4117773A1 (de) 1992-12-03
DE59202854D1 (de) 1995-08-17

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