EP0577456B1 - Agitateur rotatif à hélice - Google Patents
Agitateur rotatif à hélice Download PDFInfo
- Publication number
- EP0577456B1 EP0577456B1 EP93401535A EP93401535A EP0577456B1 EP 0577456 B1 EP0577456 B1 EP 0577456B1 EP 93401535 A EP93401535 A EP 93401535A EP 93401535 A EP93401535 A EP 93401535A EP 0577456 B1 EP0577456 B1 EP 0577456B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- axis
- planes
- principal part
- portions
- 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
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Images
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
- B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
Definitions
- the present invention relates to propeller agitators consisting of several blades integral with a tree generally disposed vertically in the axis of a container for cause a circulation of the liquid contained in the latter in an axial direction, usually descending in the central zone of the container and ascending in the zone between the latter and the container wall.
- the blades can be fixed directly on the shaft or be integral with a hub fixed on the shaft.
- the tree the agitator can be tilted relative to the axis of the container; it can, for example, be arranged horizontally or at an angle in a container with a vertical axis.
- agitators are used to mix liquids with low viscosity and / or to improve exchanges with the container wall heated or cooled, for example by circulation of a fluid in a double envelope or a coil fixed externally on the wall.
- parasitic currents in particular radial currents, superimpose on the general axial circulation; these currents are harmful because they decrease the efficiency of the agitator.
- Document FR-A-1 600 744 refers to a rotary agitator having blades which form a succession of flat elements situated in planes which intersect along straight lines substantially perpendicular to the axis of rotation, forming therebetween angles such as the skew increase from the leading edge to the trailing edge.
- Document WO-A-91/11620 describes an agitator having blades each having a fold line substantially parallel to the trailing edge, on either side of which extend a flat front part and a flat rear part but angularly deported.
- the front part is divided by a straight fold line extending from the point of intersection between the blade tip and the first fold line towards the leading edge to define a third flat part which forms an angle d 'inclination in addition to that existing between the first two parts.
- the aim of the present invention is to propose a new blade profile reducing the importance of the radial currents generated by the rotation of the agitator and, therefore, increase its efficiency.
- the propeller agitator object of the present invention is defined in claim 1, with any preferred characteristic as defined in the dependent claims. It is formed of blades arranged approximately perpendicular to the axis of the agitator, and which have with respect to a plane perpendicular to the axis of the agitator, a inclination which increases progressively or in stages from the leading edge to the trailing edge, and in that the tip of the blades is bent downstream considering the direction of flow of the liquid displaced by the blades, i.e. down in the most general case where the agitator creates a downward movement of the liquid.
- the main part of the blades and their end part can be formed each of two portions of planes forming a dihedral whose edge is approximately perpendicular to the axis of the agitator for the main part and is inclined on the horizontal for the terminal part, the two dihedrons connecting to each other in the folding plane.
- the main part of the blades may also be formed by two portions of planes connected together by a portion of cylinder whose axis is approximately perpendicular to the axis of the agitator, the planes connecting to the cylinder along two generators of the cylinder, and the terminal part may be formed of two portions of planes connecting to the end of the portions of planes of the main part and connected between them by a portion of truncated cone whose generatrices are inclined downstream relative to the generators of the cylinder portion.
- the leading edge of the main part blades is perpendicular to the axis of the agitator, and the trailing edge of the blades is in a plane perpendicular to the axis of the agitator.
- the angle formed between the main and terminal parts blades in the bisector plane of the dihedral formed by the plane portions of the part main is between 145 ° and 155 ° and preferably equal to 150 °.
- the main part of the blades could be tilted slightly downstream, i.e. downwards in case the flow created by the agitator is descending.
- the agitator shown in Figures 1 to 3 is formed by three identical blades 12 integral with a hub 14 intended to be fixed on a vertical shaft and, angularly spaced from each other by 120 °.
- the blades could be attached directly to the shaft.
- the axis 15 of the agitator and, consequently, of the hub 14 is vertical; rotated in the direction indicated by the arrow on the Figure 1, the agitator then creates a downward flow.
- These blades have a small and substantially constant thickness over their entire surface. They can be formed by cutting, folding and assembling or by stamping sheets or by molding of metals or plastics.
- Each blade is formed by a main part 16, which is horizontal and attached to the hub 14, and an end portion 18 folded down.
- Part 16 of the blades has the shape of a dihedral whose edge 23 is perpendicular to the axis of the hub and whose half-planes 20 and 22 are inclined relative to a plane perpendicular to this axis, so that the leading edge 24 of the blade is at a level higher than the trailing edge 26, the inclination of the rear half-plane being greater than that of the half-plane before.
- the angles of inclination a and b of the half-planes 20 and 22 are approximately 20 ° and 45 ° respectively. These angles can vary from 15 ° to 25 ° and 40 ° at 50 °, respectively.
- the terminal part of the blade also forms a dihedral whose edge 27 is inclined downwards with respect to the horizontal edge 23 of the main part, the half-planes 28 and 30 of this dihedron being attached to and at an angle with the half-planes 20 and 22.
- each part of the blades can be formed by cutting and bending a sheet, the two parts being assembled by welding along the line segments 32 and 34 that we can consider it as the folding line of the blade.
- each blade can be formed from a single sheet suitably cut so that it is possible to fold it along edge 23 and line segments 32 and 34 and to assemble by welding the half-planes 28 and 30 along the edge 27.
- the main part 16 'of the blades is formed by two portions of planes 20', 22 'connected by a portion cylinder 38 whose axis is perpendicular to the axis 39 of the agitator, the connection taking place along two generatrices of the cylinder.
- the plane portions 20 ′ and 22 ′ are inclined relative to a plane perpendicular to the hub axis, the angle of inclination of this part of the blades increasing from the leading edge to the trailing edge. (see figure 6).
- the end portion 18 'of the blades is formed by two portions of planes 28' and 30 ' connected by a portion of truncated cone 40 whose generatrices are inclined by relative to the generators of the cylinder portion 38, so that the tip of the blade either tilted down.
- Each part of the blades can be formed by cutting and then bending of a sheet, the two parts being assembled by welding along the line 32 ′, 33, 34 'which can be considered as the folding line of the blade since it located at the junction of the horizontal part of the blade and its folded end towards the low.
- the two portions of planes 28 'and 30' are connected to the portion of truncated cone 40 following two generators.
- the leading edge 24 'of the main part of the blades and the trailing edge 26 ′ of the blade lie in planes perpendicular to the axis of the hub, except in the area of the blade immediately adjacent to the shaft.
- the angle formed by the terminal part of the blades with the horizontal part, in the bisector plane of the dihedral formed by the two plane portions 20 ′ and 22 ′, is approximately 150 °, that is to say that, in this plane, the terminal part of the blade makes an angle of about 30 ° with the horizontal; this angle can vary between 145 ° and 155 °.
- the agitator of the invention makes it possible to reduce notably (from 20 to 35%) the mixing time by absorbing a power of the same order of magnitude than that absorbed by a conventional agitator or significantly lower, depending on the position of the agitator in the container. In some configurations the reduction in mixing time can reach 60%.
- the blades, or more precisely their main part, attached to the hub could be tilted slightly downward (angle c in Figure 2 slightly higher than 90 °).
- the invention is not limited to three-blade agitators and also applies to two-blade or more than three-blade agitators.
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Hydraulic Turbines (AREA)
- Accessories For Mixers (AREA)
Description
- h / H
- définit la position en hauteur relative de l'agitateur dans le récipient d'essai,
- Np
- est un facteur sans dimension qui est une image de la puissance absorbée.
- Np
- = P/ .N3.D5
- P
- = puissance absorbée par l'agitateur
= masse volumique du liquide - N
- = vitesse de rotation de l'agitateur
- D
- = diamètre de l'agitateur
Claims (7)
- Agitateur rotatif à hélice définissant un axe de rotation et comportant plusieurs pales identiques comprenant chacune, d'une part, une partie principale approximativement perpendiculaire audit axe de rotation, liée directement ou indirectement à cet axe et présentant, par rapport à un plan perpendiculaire à l'axe de rotation, une inclinaison pour provoquer une circulation du liquide suivant une direction axiale et, d'autre part, une partie terminale située à l'opposé dudit axe de rotation,
caractérisé en ce que cette partie terminale, sur la totalité de sa largeur, est pliée vers l'aval en considérant le sens de circulation axiale du liquide produit par la rotation de l'agitateur, pour réduire l'importance des courants radiaux engendrés par cette rotation. - Agitateur à hélice selon la revendication 1, caractérisé en ce que la partie principale (16) des pales est formée de deux portions de plans (20,22) formant un dièdre dont l'arête (23) est approximativement perpendiculaire à l'axe de l'agitateur, et la partie terminale (18) des pales est également formée de deux portions de plans (28, 30) se raccordant à l'extrémité de la partie principale et formant un dièdre dont l'arête (27) est inclinée vers l'aval par rapport à l'arête de la partie principale.
- Agitateur à hélice selon la revendication 1, caractérisé en ce que la partie principale (16') des pales est formée de deux portions de plans (20', 22') qui sont raccordé es entre elles par une portion de cylindre (38) dont l'axe est approximativement perpendiculaire à l'axe de l'agitateur, les plans se raccordant au cylindre le long de deux génératrices du cylindre, et en ce que la partie terminale (18') des pales est formée de deux portions de plans (28', 30') se raccordant à l'extrémité des portions de plans de la partie principale et raccordée entre elles par une portion de tronc de cône (40) dont les génératrices sont inclinées vers l'aval par rapport aux génératrices de la portion de cylindre.
- Agitateur à hélice selon la revendication 1, 2 ou 3 caractérisé en ce que l'angle que forment les parties principale et terminale des pales dans le plan bissecteur du dièdre formé par les deux portions de plan de la partie principale est compris entre 145° et 155° et de préférence égal à 150°.
- Agitateur à hélice, suivant l'une quelconque des revendications précédentes, caractérisé en ce que le bord d'attaque de la partie principale des pales est perpendiculaire à l'axe de l'agitateur.
- Agitateur à hélice selon l'une quelconque des revendications précédentes, caractérisé en ce que le bord de fuite des pales se trouve dans un plan perpendiculaire à l'axe de l'agitateur.
- Agitateur à hélice selon l'une quelconque des revendications précédentes caractérisé en ce que la partie principale des pales est légèrement inclinée vers l'aval.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9208010A FR2692809B1 (fr) | 1992-06-30 | 1992-06-30 | Agitateur rotatif à hélice. |
FR9208010 | 1992-06-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0577456A1 EP0577456A1 (fr) | 1994-01-05 |
EP0577456B1 true EP0577456B1 (fr) | 1999-01-13 |
Family
ID=9431334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93401535A Expired - Lifetime EP0577456B1 (fr) | 1992-06-30 | 1993-06-16 | Agitateur rotatif à hélice |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0577456B1 (fr) |
AT (1) | ATE175588T1 (fr) |
DE (1) | DE69323004T2 (fr) |
DK (1) | DK0577456T3 (fr) |
ES (1) | ES2128399T3 (fr) |
FR (1) | FR2692809B1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4401596A1 (de) * | 1994-01-20 | 1995-07-27 | Ekato Ruehr Mischtechnik | Rührorgan |
US6054563A (en) * | 1997-03-05 | 2000-04-25 | Rhodia Chimie | Preparation of solid, powdery rare earth carboxylates by evaporation method |
DE19709818B4 (de) * | 1997-03-10 | 2007-09-27 | Wilo Ag | Tauchrührwerk |
US6090926A (en) * | 1998-06-05 | 2000-07-18 | Rhodia Rare Earths Inc. | Powdery, solid rare earth carboxylates with improved solubility in aliphatic solvents which are highly active catalysts in Ziegler-Natta systems |
FI123826B (en) | 2012-02-20 | 2013-11-15 | Outotec Oyj | Axial flow propeller blade and axial flow propeller |
EP2926892B1 (fr) * | 2014-04-04 | 2021-01-13 | Milton Roy Europe | Mobile d'agitation |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1600744A (fr) * | 1968-12-11 | 1970-07-27 | ||
FR2313114A1 (fr) * | 1975-06-04 | 1976-12-31 | Procedes Sem | Nouveaux perfectionnements aux helices pour melangeurs |
US5052892A (en) * | 1990-01-29 | 1991-10-01 | Chemineer, Inc. | High efficiency mixer impeller |
-
1992
- 1992-06-30 FR FR9208010A patent/FR2692809B1/fr not_active Expired - Lifetime
-
1993
- 1993-06-16 DE DE69323004T patent/DE69323004T2/de not_active Expired - Fee Related
- 1993-06-16 DK DK93401535T patent/DK0577456T3/da active
- 1993-06-16 EP EP93401535A patent/EP0577456B1/fr not_active Expired - Lifetime
- 1993-06-16 AT AT93401535T patent/ATE175588T1/de not_active IP Right Cessation
- 1993-06-16 ES ES93401535T patent/ES2128399T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0577456A1 (fr) | 1994-01-05 |
DK0577456T3 (da) | 1999-09-06 |
ATE175588T1 (de) | 1999-01-15 |
DE69323004D1 (de) | 1999-02-25 |
DE69323004T2 (de) | 1999-06-24 |
FR2692809A1 (fr) | 1993-12-31 |
ES2128399T3 (es) | 1999-05-16 |
FR2692809B1 (fr) | 1994-11-25 |
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