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EP1475145B1 - Agitateur - Google Patents

Agitateur Download PDF

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Publication number
EP1475145B1
EP1475145B1 EP04010919A EP04010919A EP1475145B1 EP 1475145 B1 EP1475145 B1 EP 1475145B1 EP 04010919 A EP04010919 A EP 04010919A EP 04010919 A EP04010919 A EP 04010919A EP 1475145 B1 EP1475145 B1 EP 1475145B1
Authority
EP
European Patent Office
Prior art keywords
range
stirrer
blade
bent
section
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.)
Expired - Lifetime
Application number
EP04010919A
Other languages
German (de)
English (en)
Other versions
EP1475145A3 (fr
EP1475145A2 (fr
Inventor
Werner Dipl.-Ing. Himmelsbach
David Eur.-Ing. Houlton
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 EP1475145A2 publication Critical patent/EP1475145A2/fr
Publication of EP1475145A3 publication Critical patent/EP1475145A3/fr
Application granted granted Critical
Publication of EP1475145B1 publication Critical patent/EP1475145B1/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
    • B01F27/11—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids

Definitions

  • the invention relates to a stirring member, in particular for dispersing gases in liquids, consisting of a plurality of stirring blades, wherein each stirring blade has a forwardly bent portion in the direction of rotation, as it for example US-A-5,316,443 is known.
  • a gas supplied to the liquid to be stirred is dispersed in the smallest possible bubbles in order to create a large surface area for the mass transfer between the gas and the liquid.
  • the invention has for its object to shorten the mixing time, while keeping the power loss low.
  • the bent portion with a Beispie! provided approximately triangular end portion which forms an angle ⁇ to the bent portion, and is directed away from the stirring blade.
  • the angle ⁇ may be in the range of about 0 ° to 45 °, preferably in the range of about 10 ° to 30 °.
  • this section is formed at the rear end of the stirring blade seen in the direction of rotation.
  • the bent portion is seen in the radial direction in the outer region and is e.g. formed extending to the outer peripheral edge of the stirring blade.
  • the ratio of the radial length L1 of the bent portion to the radial length L2 of the entire stirring blade is in the range of about 0.2 to 1.0, preferably in the range of about 0.4 to 0.6.
  • the ratio of the width B1 of the bent portion to the width B2 of the entire stirring blade is in the range of about 0.1 to 1, preferably in the range of about 0.15 to 0.4.
  • the agitating blade is set to the plane of rotation at an angle ⁇ , which is in the range of about 10 ° to 45 °, preferably in the range of about 20 ° to 30 °.
  • the angle ⁇ between the bent portion and the stirring blade in the range of about 10 ° to 45 °, preferably in the range of about 20 ° to 30 °.
  • the ratio of radius of curvature R1 of the bent portion to outer radius R2 of the stirring blade is in the range of about 0 to 0.3, preferably in the range of about 0.01 to 0.15.
  • the stirring blade is provided at its seen in the direction of rotation front end with an end portion which is bent at an angle ⁇ to the stirring blade and on the plane of the bent portion.
  • the angle ⁇ may be in the range of about 0 ° to +/- 40 °, preferably in the range of about 0 ° to +/- 15 °.
  • the ratio of the width B4 of the bent portion to the total width B2 of the stirring blade is in the range of about 0 to 0.5, preferably in the range of about 0.1 to 0.3.
  • the ratio of radial length L3 of the approximately triangular end portion to the radial length L4 of the bent portion is about 0 to 1.0, preferably about 0.5 to 1.0.
  • the ratio of width B3 of the approximately triangular end portion to the width B1 of the bent portion is about 0.05 to 0.75, preferably about 0.2 to 0.6.
  • FIG. 1 shows a plan view of an agitation system 10 with a hub 12 for attachment of the agitation system 10 to a stirrer shaft (not shown).
  • stirrer blades 14 are fixedly connected by means of brackets 16, which are arranged at angular intervals of 120 ° to each other.
  • the stirring blades 14 can also be attached directly to a stirrer shaft.
  • the three illustrated stirring blades 14 are only an example, and two or more stirring blades may be attached to the hub 12.
  • the axis of the agitator shaft, not shown, is at 18, the outer radius of the Rownblatter 14 is R2 and the direction of rotation is in the clockwise direction and is designated by the arrow P.
  • the brackets 16 may extend transversely but also at an acute or obtuse angle to the axis 18.
  • Each agitating blade 14 is provided with a rotationally forwardly deflected portion 20 formed at the rear end portion of the stirring blade 14 in the rotational direction and extending radially over a portion of the radial length of the agitating blade 14, e.g. extends to the outer peripheral edge.
  • the ratio of the radial length L1 of the bent portion 20 to the radial length L2 of the entire stirring blade 14 is, for example, in the range of about 0.2 to 1.0, and more preferably in the range of about 0.4 to 0.6.
  • the ratio of the width B1 of the bent portion 20 to the total width B2 of the stirring blade 14 is, for example, in the range of about 0.1 to 1.0, and more preferably in the range of about 0.15 to 0.4.
  • the bent portion 20 is formed of a curved portion 26 having a radius of curvature R1 and an adjoining particular planar part 28, which may optionally be curved, however.
  • the ratio of this radius of curvature R1 to the outer radius R2 of the stirring blade 14 is for example in the range of about 0 to 0.3, and in particular in the range of about 0.01 to 0.15.
  • the bent portion 20, with respect to the vertical axis of rotation 18, extends upward, and then substantially forward in the direction of rotation of the stirring element 10.
  • Each bent portion 20 is preferably provided at its front end in the direction of rotation with an approximately triangular end portion 22, for example, which forms an angle ⁇ to the part 28 of the bent portion 20, and which is directed away from the stirring blade 14.
  • the angle ⁇ is suitably in the range of about 0 ° to 45 °, and in particular in the range of about 10 ° to 30 °.
  • the tip of the triangular end portion is radially outwardly directed in the illustrated example, but it may also be directed inwardly.
  • the ratio of the radial length L3 of the approximately triangular end portion 22 to the radial length L4 of the bent portion is suitably about 0 to 1.0, and more preferably about 0.5 to 1.0.
  • the ratio of the width B3 of the end portion 22 to the width B1 of the bent portion 20 is approximately in the range of 0.05 to 0.75, and more preferably in the range of about 0.2 to 0.6.
  • the stirring blade 14 is set at an angle ⁇ to the plane of rotation D which lies in the range of approximately 10 ° to 45 °, and in particular in the range of approximately 20 ° to 30 °.
  • the bent portion 20, 28 forms the stirring blade 14 at an angle ⁇ , which is for example in the range of about 10 ° to 45 °, and in particular in the range of about 20 ° to 30 °.
  • Each agitating blade 14 may have at its front end viewed in the direction of rotation an end portion 24 which is bent at an angle ⁇ to the agitating blade 14 and to the plane of the bent portion 20, 28, the angle ⁇ being in the range of about 0 °, for example can be up to +/- 40 °, and in particular in the range of about 0 ° to +/- 15 °.
  • the ratio of the width B4 (seen in the circumferential direction) of the bent end portion 24 to the total width B2 of the stirring blade 14 is suitably in the range of about 0 to 0.5, and in particular in the range of about 0.1 to 0.3.
  • the crease line between the parts 14 and 24 extends in the example shown transversely to the outer edge of the stirring blade 14, but it may also include an angle thereto.
  • the viewed in the direction of rotation front of the end portion 24 may, as shown, rounded and / or beveled, the chamfer may be formed in particular in the radially outer region of the stirring blade 14.
  • the stirrer according to the invention allows a good reduction in the mixing time with good dispersion quality and only a slight decrease in performance. Due to the larger area of the stirring blades 14 relative to the surface of the bent
  • Sections 20, 28 is achieved that the radial pumping action is eccentric and has an axial component.
  • the combination of axial and radial flow patterns leads to significantly lower mixing times in the stirred tank. Since the approximately box-shaped shape of the bent portions 20, 28, the formation of gas cushioning behind the stirring blades can be substantially avoided, power losses are reduced in the dispersion of gases. Finally, a better heat transfer is achieved by the strong radial flow than in the axial flow.
  • the stirrer according to the invention thus combines the advantages of radially pumping and axially pumping stirrers.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Claims (14)

  1. Organe d'agitation servant en particulier à disperser des gaz dans des liquides, organe d'agitation qui est constitué de plusieurs pales agitatrices (14), chaque pale agitatrice (14) présentant une section (20) pliée vers l'avant, dans le sens de rotation, caractérisé en ce que la section pliée (20) présente au niveau de sa zone d'extrémité avant, vue dans le sens de rotation, une section terminale (22) à peu près triangulaire par exemple, qui forme un angle (γ) avec la pièce plane (28) de la pièce pliée (20) et qui s'éloigne de la pale agitatrice (14).
  2. Organe d'agitation suivant la revendication 1, caractérisé en ce que la section pliée (20) est conçue à l'extrémité arrière, vue dans le sens de rotation, de la pale agitatrice (14).
  3. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que la section pliée (20) est conçue dans le sens radial, au niveau de la zone extérieure de la pale agitatrice (14).
  4. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que le rapport entre la longueur radiale (L1) de la section pliée (20) et la longueur totale (L2) de la pale d'agitation (14) est compris dans une fourchette de 0,2 à 1,0 environ, de préférence dans une fourchette de 0,4 à 0,6 environ.
  5. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que, vu dans le sens de la périphérie, le rapport entre la largeur (B1) de la section pliée (20) et la largeur totale (B2) de la pale agitatrice (14) est compris dans une fourchette de 0,1 à 1,0 environ, de préférence dans une fourchette de 0,15 à 0,4 environ.
  6. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que le rapport entre le rayon de courbure (R1) de la section pliée (20, 26) et le rayon extérieur (R2) de la pale agitatrice (14) est compris dans une fourchette de 0 et 0,3 environ, de préférence dans une fourchette de 0,01 à 0,15 environ.
  7. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que l'angle (γ) est compris dans une fourchette de 0° à 45° environ, de préférence dans une fourchette de 10° à 30° environ.
  8. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que le rapport entre la longueur radiale (L3) de la section terminale (22) à peu près triangulaire et la longueur radiale (L4) de la section pliée (20) est compris entre 0 et 1,0 environ, de préférence entre 0,5 et 1,0 environ.
  9. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que le rapport entre la largeur (B3) de la section terminale (22) et la largeur (B4) de la section pliée (20) est compris entre 0,05 et 0,75 environ, de préférence entre 0,2 et 0,6 environ.
  10. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que la pale agitatrice (14) est inclinée par rapport à l'axe de rotation (D) de manière à former un angle (α), qui est compris dans une fourchette de 10° à 45° environ, de préférence dans une fourchette de 20° à 30° environ.
  11. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que la section pliée (20, 28) forme un angle (β) avec la pale agitatrice (14), angle (β) qui est compris dans une fourchette de 10° à 45° environ, de préférence dans une fourchette de 20° à 30° environ.
  12. Organe d'agitation suivant une des revendications précédentes, caractérisé en ce que la pale agitatrice (14) présente au niveau de son extrémité avant, vue dans le sens de rotation, une section terminale (24), qui est coudée en direction du plan de la section pliée (29, 28) en formant un angle (δ) avec la pale agitatrice (14).
  13. Organe d'agitation suivant la revendication 12, caractérisé en ce que l'angle (δ) est compris dans une plage de 0° à ± 45° environ, de préférence dans une plage de 0° à ± 15° environ.
  14. Organe d'agitation suivant une des revendications 12 ou 13, caractérisé en ce que le rapport de la largeur (B4) de la section terminale coudée (24) et de la largeur totale (B2) de la pale agitatrice (14) est compris dans la fourchette de 0 à 0,5 environ, de préférence dans la fourchette de 0,1 à 0,3 environ.
EP04010919A 2003-05-08 2004-05-07 Agitateur Expired - Lifetime EP1475145B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20307199U DE20307199U1 (de) 2003-05-08 2003-05-08 Rührorgan
DE20307199U 2003-05-08

Publications (3)

Publication Number Publication Date
EP1475145A2 EP1475145A2 (fr) 2004-11-10
EP1475145A3 EP1475145A3 (fr) 2005-01-19
EP1475145B1 true EP1475145B1 (fr) 2007-10-10

Family

ID=27588915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04010919A Expired - Lifetime EP1475145B1 (fr) 2003-05-08 2004-05-07 Agitateur

Country Status (5)

Country Link
US (1) US7296925B2 (fr)
EP (1) EP1475145B1 (fr)
AT (1) ATE375198T1 (fr)
DE (2) DE20307199U1 (fr)
DK (1) DK1475145T3 (fr)

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DE202006007423U1 (de) * 2006-05-09 2007-09-13 EKATO Rühr- und Mischtechnik GmbH Rührorgan
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DE102010004206A1 (de) 2009-06-08 2010-12-09 EKATO Rühr- und Mischtechnik GmbH Rühranrodnung
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FI3213811T3 (fi) * 2016-03-01 2023-01-13 Agitaattorin juoksupyörän siipi, juoksupyörä ja agitaattori
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Also Published As

Publication number Publication date
EP1475145A3 (fr) 2005-01-19
DE502004005173D1 (de) 2007-11-22
DE20307199U1 (de) 2003-07-10
EP1475145A2 (fr) 2004-11-10
US7296925B2 (en) 2007-11-20
ATE375198T1 (de) 2007-10-15
DK1475145T3 (da) 2008-02-11
US20040228210A1 (en) 2004-11-18

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