EP1571345B1 - Fan - Google Patents

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Publication number
EP1571345B1
EP1571345B1 EP05300100A EP05300100A EP1571345B1 EP 1571345 B1 EP1571345 B1 EP 1571345B1 EP 05300100 A EP05300100 A EP 05300100A EP 05300100 A EP05300100 A EP 05300100A EP 1571345 B1 EP1571345 B1 EP 1571345B1
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EP
European Patent Office
Prior art keywords
fan according
foregoing
flange
hub
relief
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.)
Revoked
Application number
EP05300100A
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German (de)
French (fr)
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EP1571345A1 (en
Inventor
Alain Buisson
Marc Elkeletian
Adrien Menard
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Moteurs Leroy Somer SAS
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Moteurs Leroy Somer SAS
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Application filed by Moteurs Leroy Somer SAS filed Critical Moteurs Leroy Somer SAS
Publication of EP1571345A1 publication Critical patent/EP1571345A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings

Definitions

  • the present invention relates to the attachment of the blades on the hub of a fan, including a helical fan.
  • each blade is held between a flange and the corresponding counter flange, which reduces the local stresses in the blade.
  • the clamping device may comprise at least one screw or a rivet. When a screw is used, it can be, for example, self-forming or, alternatively, conventional net.
  • the clamping device may comprise a single screw for each blade.
  • the screw is central.
  • Such a screw can advantageously replace several rivets, for example.
  • the clamping force can be more easily controlled with a screw than with a rivet.
  • the hub is advantageously monolithic, being made for example by injection molding, in particular aluminum or aluminum alloy.
  • the counter flange may be monolithic and obtained by injection molding also, in particular aluminum or aluminum alloy.
  • the blade itself may be metal, for example aluminum sheet or stamped steel, but it is not beyond the scope of the present invention if it is made of other materials.
  • the fan may comprise between 2 and 12, or even between 4 and 10, in particular between 5 and 8 blades, 7 blades for example.
  • the flanges are inclined relative to the axis of rotation of the hub.
  • the flanges generally extend in a plane whose normal is not parallel to the axis of rotation of the fan, in particular non-coplanar with this axis.
  • the flanges extend out of a radial plane and / or out of a plane containing the axis of rotation of the fan.
  • Each flange may include a bore axis perpendicular to its plane.
  • the clamping device may comprise at least one washer interposed between a head of the screw or rivet and the flange.
  • the latter may include a counterbore for receiving the washer.
  • the counter-flange may comprise a barrel arranged to engage in a drilling of the flange.
  • the counter flange may comprise, on its inner face, a first relief configured to cooperate with a second relief formed on the face opposite the flange.
  • This first relief may be a recess, for example.
  • the shape of the first relief may be non-symmetrical of revolution, which may prevent it from turning relative to the flange. It can be for example of square shape.
  • the first relief may include inclined blanks to contribute to the centering of the counter-flange on the flange during assembly.
  • the second relief may have a truncated pyramidal general shape, with for example four sides.
  • the counter-flange may comprise an outwardly slightly convex outer face, which may contribute to improving the aerodynamics and make it possible to obtain a counter-flange whose variable thickness is chosen so as to have a stress of clamping relatively well distributed on its inner face, with a maximum to the right of the screw and a gradual decrease in this constraint when approaching the edges of the counter-flange.
  • the counter flange may comprise two opposite notches, adapted to cooperate with a corresponding tool during the manufacture of the fan.
  • the counter-flange may have a general diamond shape and the two notches may be located substantially on a diagonal of the rhombus.
  • FIG. 1 schematically, the hub 9 of a fan, this hub 9 being intended to be rotated about an axis of rotation X.
  • This hub 9 has at its periphery a succession of flanges 2 extending radially to and each serving for fixing a blade 1 which is shown schematically in section at the figure 2 .
  • Each blade 1 comprises a flattened end portion which is fixed on the corresponding flange 2 by means of a counter-flange 3 and a clamping device 4 comprising a screw 5 and a washer 6.
  • All the counter-flanges are parts that are independent of each other and preferably identical.
  • the hub 9 is monolithic and made by injection pressure aluminum.
  • the hub 9 comprises a bowl 21 to which the flanges 2 are connected, this bowl 21 internally having ribs 22 and at its center a hole 23 for the passage of the motor drive shaft.
  • This bore 23 has a groove 24 to receive a shaft key and improve the transfer of the driving torque.
  • the hub 9 comprises, in the example illustrated, an odd number of flanges 2, namely seven flanges 2, but it is not beyond the scope of the present invention if it comprises a different number, for example between 2 and 10 flanges, or between 5 and 8.
  • the fan has the same number of counter-flanges 3 and blades 1.
  • Each of the flanges 2 comprises a bore 10, whose axis is substantially perpendicular to the plane of the flange, but not parallel to the axis of rotation X of the hub.
  • the bore 10 may comprise an axis parallel to the axis of the hub.
  • Each of the flanges 2 comprises on its upper face 12 a countersink 11 for receiving the washer 6 and on its lower face 13 a relief 14 forming a projection, which has in the illustrated example a general shape of truncated pyramid with four sides, as one can see him on the figure 3 .
  • the blade 1 is held tight between the flange 2 and the counter-flange 3 by the screw 5.
  • the latter can be self-forming or alternatively conventional thread, but it is not beyond the scope of the present invention when the fastener 4 has several screws and / or one or more rivets.
  • the counter flange 3 is, in the example described, monolithic and obtained by aluminum injection. It includes, as illustrated in figure 4 , a shank 27 arranged to engage in the bore 10 of the flange 2 and receive the screw 5. This shank may be tapped during the introduction of the screw 5 when the latter is self-forming, or alternatively before the assembly of the opinion.
  • against the flange 3 further comprises, on its inner face, a recessed relief 28, configured to cooperate with the raised projection 14 above.
  • the relief 28 is in the example described a recess which has a substantially square shape, with inclined blanks 32 adapted to the shape of the corresponding relief 14.
  • the relief 28 could be of another non-symmetrical form of revolution, in particular polygonal.
  • the counter-flange 3 still presents, as can be seen on the figure 5 , an outwardly curved outer face 29 of aerodynamic profile, in order to create the least possible turbulence during the rotation of the fan.
  • the counter-flange 3 has a general diamond shape and has two opposite notches 30 located substantially on a diagonal of the rhombus to receive mounting tools and allow easier mounting of the corresponding blade 1 on the hub 9.
  • the shape of the flanges and counter-flanges can be modified.
  • the latter may for example cooperate differently with the flanges, with for example a protruding projection on the counter-flanges coming into a recessed hollow flanges.
  • each flange and the associated sector can be monolithic. It may for example be made by injection, for example of aluminum, or by injection of plastic material under pressure. Each sector can be assembled on the hub by screws.
  • the hub may for example comprise a central portion serving as a support for the sectors, the flanges being monolithic with the sectors.
  • Such a configuration makes it possible to use molds for injection that are less complex, and therefore less expensive, and to allow a certain degree of modularity, for example by varying the number of blades.
  • cylindrical base flanges it is easy to vary the inclination of the blades relative to the axis of rotation of the hub by loosening the half-hubs and rotating the bases of the flanges in their housing.
  • a non-monolithic hub can for example allow the manufacture of larger diameter propellers, or propellers whose number or orientation of the blades can be modified.
  • the fan according to the invention may be suitable for various industrial applications and in particular be different from a ceiling fan.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The fan has two blades (1), and a hub including two flanges (2) for fixing the blades on the hub. Two companion flanges (3) are associated with the flanges (2) and include notches. A clamping device (4) is utilized for clamping each blade between the flanges and the companion flanges through a screw (5), where both the flanges (2, 3) are formed by injection molding.

Description

La présente invention concerne la fixation des pales sur le moyeu d'un ventilateur, notamment un ventilateur hélicoïde.The present invention relates to the attachment of the blades on the hub of a fan, including a helical fan.

On connaît par la demande de brevet allemand DE 39 41 691 A1 un ventilateur dans lequel les pales sont vissées sur des brides du moyeu. Cette solution peut présenter l'inconvénient d'introduire des contraintes locales sur les pales autour des vis.We know by the request of German patent DE 39 41 691 A1 a fan in which the blades are screwed onto flanges of the hub. This solution may have the disadvantage of introducing local stresses on the blades around the screws.

Il existe un besoin pour disposer d'un ventilateur dont les pales puissent être fixées au moyeu d'une manière économique tout en remédiant à l'inconvénient ci-dessus.There is a need for a fan whose blades can be attached to the hub in an economical manner while overcoming the above disadvantage.

On connaît par le brevet US 5 304 037 et les demandes de brevet EP-A-0 979 948 et US 2003/228224 des ventilateurs de plafonds comportant des brides s'étendant dans un plan normal à l'axe de rotation du ventilateur. De tels ventilateurs peuvent ne pas fournir une ventilation entièrement satisfaisante dans certains cas.We know by US Patent 5,304,037 and requests for EP-A-0 979 948 and US 2003/228224 Ceiling fans having flanges extending in a plane normal to the axis of rotation of the fan. Such fans may not provide fully satisfactory ventilation in some cases.

La présente invention a ainsi pour objet un ventilateur comportant :

  • au moins deux pales,
  • un moyeu comportant au moins deux brides servant à la fixation des pales sur le moyeu,
  • au moins deux contre-brides associées chacune à une bride, et
  • un dispositif de serrage de chaque pale entre une bride et la contre-bride associée.
The present invention thus relates to a fan comprising:
  • at least two blades,
  • a hub comprising at least two flanges for fixing the blades on the hub,
  • at least two counter flanges each associated with a flange, and
  • a device for clamping each blade between a flange and the associated counter flange.

Grâce à l'invention, chaque pale est maintenue entre une bride et la contre-bride correspondante, ce qui réduit les contraintes locales dans la pale.Thanks to the invention, each blade is held between a flange and the corresponding counter flange, which reduces the local stresses in the blade.

Cette meilleure répartition des contraintes peut notamment réduire le risque de déchirement de la pale sous l'effet de la superposition des contraintes statiques de serrage, des efforts centrifuges et des contraintes aérodynamiques.This better distribution of stresses can in particular reduce the risk of tearing of the blade under the effect of the superposition of static clamping stresses, centrifugal forces and aerodynamic stresses.

Le dispositif de serrage peut comporter au moins une vis ou un rivet. Lorsqu'une vis est utilisée, celle-ci peut être, par exemple, autoformeuse ou, en variante, à filet classique. Le dispositif de serrage peut comporter une vis unique pour chaque pale.The clamping device may comprise at least one screw or a rivet. When a screw is used, it can be, for example, self-forming or, alternatively, conventional net. The clamping device may comprise a single screw for each blade.

Dans un mode particulier de réalisation, la vis est centrale. Une telle vis peut avantageusement remplacer plusieurs rivets, par exemple. Par ailleurs, l'effort de serrage peut être plus facilement maîtrisé avec une vis qu'avec un rivet.In a particular embodiment, the screw is central. Such a screw can advantageously replace several rivets, for example. Moreover, the clamping force can be more easily controlled with a screw than with a rivet.

Le moyeu est avantageusement monolithique, étant réalisé par exemple par moulage par injection, notamment d'aluminium ou d'alliage d'aluminium.The hub is advantageously monolithic, being made for example by injection molding, in particular aluminum or aluminum alloy.

La contre-bride peut être monolithique et obtenue par moulage par injection également, notamment d'aluminium ou d'alliage d'aluminium.The counter flange may be monolithic and obtained by injection molding also, in particular aluminum or aluminum alloy.

L'obtention de la bride et de la contre-bride par moulage par injection peut permettre d'éviter toute reprise d'usinage et d'abaisser le coût de la fabrication du ventilateur.Obtaining the flange and the counter flange by injection molding can avoid any resumption of machining and lower the cost of manufacturing the fan.

La pale elle-même peut être métallique, par exemple en tôle d'aluminium ou d'acier emboutie, mais on ne sort pas du cadre de la présente invention si elle est réalisée dans d'autres matériaux.The blade itself may be metal, for example aluminum sheet or stamped steel, but it is not beyond the scope of the present invention if it is made of other materials.

Le ventilateur peut comporter entre 2 et 12, voire entre 4 et 10, notamment entre 5 et 8 pales, 7 pales par exemple.The fan may comprise between 2 and 12, or even between 4 and 10, in particular between 5 and 8 blades, 7 blades for example.

Les brides sont inclinées par rapport à l'axe de rotation du moyeu. Les brides s'étendent généralement dans un plan dont la normale n'est pas parallèle à l'axe de rotation du ventilateur, notamment non-coplanaire avec cet axe. Les brides 'étendent hors d'un plan radial et/ou hors d'un plan contenant l'axe de rotation du ventilateur.The flanges are inclined relative to the axis of rotation of the hub. The flanges generally extend in a plane whose normal is not parallel to the axis of rotation of the fan, in particular non-coplanar with this axis. The flanges extend out of a radial plane and / or out of a plane containing the axis of rotation of the fan.

Chaque bride peut comporter un perçage d'axe perpendiculaire à son plan.Each flange may include a bore axis perpendicular to its plane.

Le dispositif de serrage peut comporter au moins une rondelle intercalée entre une tête de la vis ou du rivet et la bride. Cette dernière peut comporter un lamage pour recevoir la rondelle.The clamping device may comprise at least one washer interposed between a head of the screw or rivet and the flange. The latter may include a counterbore for receiving the washer.

La contre-bride peut comporter un fût agencé pour s'engager dans un perçage de la bride.The counter-flange may comprise a barrel arranged to engage in a drilling of the flange.

La contre-bride peut comporter, sur sa face intérieure, un premier relief configuré pour coopérer avec un second relief formé sur la face en regard de la bride. Ce premier relief peut être un renfoncement par exemple. La forme du premier relief peut être non symétrique de révolution, ce qui peut lui éviter de tourner relativement à la bride. Il peut être par exemple de forme carrée. Le premier relief peut comporter des flans inclinés afm de contribuer au centrage de la contre-bride sur la bride lors du montage. Le deuxième relief peut présenter une forme générale pyramidale tronquée, avec par exemple quatre côtés.The counter flange may comprise, on its inner face, a first relief configured to cooperate with a second relief formed on the face opposite the flange. This first relief may be a recess, for example. The shape of the first relief may be non-symmetrical of revolution, which may prevent it from turning relative to the flange. It can be for example of square shape. The first relief may include inclined blanks to contribute to the centering of the counter-flange on the flange during assembly. The second relief may have a truncated pyramidal general shape, with for example four sides.

La contre-bride peut comporter une face extérieure légèrement bombée vers l'extérieur, ce qui peut contribuer à améliorer l'aérodynamique et permettre d'obtenir une contre-bride dont l'épaisseur, variable, est choisie de façon à avoir une contrainte de serrage relativement bien répartie sur sa face intérieure, avec un maximum au droit de la vis et une décroissance progressive de cette contrainte lorsqu'on se rapproche des bords de la contre-bride.The counter-flange may comprise an outwardly slightly convex outer face, which may contribute to improving the aerodynamics and make it possible to obtain a counter-flange whose variable thickness is chosen so as to have a stress of clamping relatively well distributed on its inner face, with a maximum to the right of the screw and a gradual decrease in this constraint when approaching the edges of the counter-flange.

La contre-bride peut comporter deux encoches opposées, adaptées à coopérer avec un outillage correspondant lors de la fabrication du ventilateur. La contre-bride peut présenter une forme générale de losange et les deux encoches peuvent être situées sensiblement sur une diagonale du losange.The counter flange may comprise two opposite notches, adapted to cooperate with a corresponding tool during the manufacture of the fan. The counter-flange may have a general diamond shape and the two notches may be located substantially on a diagonal of the rhombus.

L'invention pourra être mieux comprise à la lecture de la description détaillée qui va suivre, d'un exemple de réalisation non limitatif de celle-ci, et à l'observation du dessin annexé, sur lequel :

  • la figure 1 représente en vue de dessus le moyeu d'un ventilateur réalisé conformément à l'invention,
  • la figure 2 illustre en coupe axiale, schématique et partielle, la fixation d'une pale sur le moyeu de la figure 1,
  • la figure 3 représente en vue de dessous, partiellement, le moyeu de la figure 1, et
  • les figures 4 et 5 représentent respectivement de dessus et de dessous la contre-bride de la figure 2.
The invention will be better understood on reading the following detailed description of a nonlimiting exemplary embodiment thereof, and on the observation of the appended drawing, in which:
  • the figure 1 represents in plan view the hub of a fan produced according to the invention,
  • the figure 2 illustrates in axial section, schematic and partial, the attachment of a blade on the hub of the figure 1 ,
  • the figure 3 represents in view from below, partially, the hub of the figure 1 , and
  • the Figures 4 and 5 respectively represent from above and from below the counter-flange of the figure 2 .

On a représenté à la figure 1, de manière schématique, le moyeu 9 d'un ventilateur, ce moyeu 9 étant destiné à être entraîné en rotation autour d'un axe de rotation X. Ce moyeu 9 comporte à sa périphérie une succession de brides 2 s'étendant radialement vers l'extérieur et servant chacune à la fixation d'une pale 1 que l'on a représentée de manière schématique en coupe à la figure 2.We have shown figure 1 , schematically, the hub 9 of a fan, this hub 9 being intended to be rotated about an axis of rotation X. This hub 9 has at its periphery a succession of flanges 2 extending radially to and each serving for fixing a blade 1 which is shown schematically in section at the figure 2 .

Chaque pale 1 comporte une partie d'extrémité aplatie qui est fixée sur la bride 2 correspondante au moyen d'une contre-bride 3 et d'un dispositif de serrage 4 comportant une vis 5 et une rondelle 6.Each blade 1 comprises a flattened end portion which is fixed on the corresponding flange 2 by means of a counter-flange 3 and a clamping device 4 comprising a screw 5 and a washer 6.

Toutes les contre-brides sont des pièces indépendantes les unes des autres et de préférence identiques.All the counter-flanges are parts that are independent of each other and preferably identical.

Dans l'exemple décrit, le moyeu 9 est monolithique et réalisé par injection sous pression d'aluminium. Le moyeu 9 comporte un bol 21 auquel sont reliées les brides 2, ce bol 21 comportant intérieurement des nervures 22 et en son centre un perçage 23 pour le passage de l'arbre d'entraînement du moteur. Ce perçage 23 comporte une rainure 24 pour recevoir une clavette de l'arbre et améliorer le transfert du couple d'entraînement.In the example described, the hub 9 is monolithic and made by injection pressure aluminum. The hub 9 comprises a bowl 21 to which the flanges 2 are connected, this bowl 21 internally having ribs 22 and at its center a hole 23 for the passage of the motor drive shaft. This bore 23 has a groove 24 to receive a shaft key and improve the transfer of the driving torque.

Le moyeu 9 comporte, dans l'exemple illustré, un nombre impair de brides 2, à savoir sept brides 2, mais on ne sort pas du cadre de la présente invention s'il en comporte un nombre différent, par exemple entre 2 et 10 brides, voire entre 5 et 8. Le ventilateur comporte le même nombre de contre-brides 3 et pales 1.The hub 9 comprises, in the example illustrated, an odd number of flanges 2, namely seven flanges 2, but it is not beyond the scope of the present invention if it comprises a different number, for example between 2 and 10 flanges, or between 5 and 8. The fan has the same number of counter-flanges 3 and blades 1.

Chacune des brides 2 comporte un perçage 10, d'axe sensiblement perpendiculaire au plan de la bride, mais non parallèle à l'axe de rotation X du moyeu.Each of the flanges 2 comprises a bore 10, whose axis is substantially perpendicular to the plane of the flange, but not parallel to the axis of rotation X of the hub.

En variante, le perçage 10 peut comporter un axe parallèle à l'axe du moyeu.Alternatively, the bore 10 may comprise an axis parallel to the axis of the hub.

Chacune des brides 2 comporte sur sa face supérieure 12 un lamage 11 pour recevoir la rondelle 6 et sur sa face inférieure 13 un relief 14 formant saillie, lequel présente dans l'exemple illustré une forme générale de pyramide tronquée à quatre côtés, comme on peut le voir sur la figure 3.Each of the flanges 2 comprises on its upper face 12 a countersink 11 for receiving the washer 6 and on its lower face 13 a relief 14 forming a projection, which has in the illustrated example a general shape of truncated pyramid with four sides, as one can see him on the figure 3 .

La pale 1 est maintenue serrée entre la bride 2 et la contre-bride 3 par la vis 5. Cette dernière peut être autoformeuse ou en variante à filet classique, mais on ne sort pas du cadre de la présente invention lorsque le dispositif de fixation 4 comporte plusieurs vis et/ou un ou plusieurs rivets.The blade 1 is held tight between the flange 2 and the counter-flange 3 by the screw 5. The latter can be self-forming or alternatively conventional thread, but it is not beyond the scope of the present invention when the fastener 4 has several screws and / or one or more rivets.

La contre-bride 3 est, dans l'exemple décrit, monolithique et obtenue par injection d'aluminium. Elle comporte, comme illustré à la figure 4, un fût 27 agencé pour s'engager dans le perçage 10 de la bride 2 et recevoir la vis 5. Ce fût peut être taraudé lors de l'introduction de la vis 5 lorsque cette dernière est autoformeuse, ou en variante avant le montage de la vis.The counter flange 3 is, in the example described, monolithic and obtained by aluminum injection. It includes, as illustrated in figure 4 , a shank 27 arranged to engage in the bore 10 of the flange 2 and receive the screw 5. This shank may be tapped during the introduction of the screw 5 when the latter is self-forming, or alternatively before the assembly of the opinion.

La contre-bride 3 comporte encore, sur sa face intérieure, un relief en creux 28, configuré pour coopérer avec le relief en saillie 14 précité.Against the flange 3 further comprises, on its inner face, a recessed relief 28, configured to cooperate with the raised projection 14 above.

Le relief 28 est dans l'exemple décrit un renfoncement qui présente une forme sensiblement carrée, avec des flans 32 inclinés, adaptés à la forme du relief correspondant 14.The relief 28 is in the example described a recess which has a substantially square shape, with inclined blanks 32 adapted to the shape of the corresponding relief 14.

Le relief 28 pourrait être d'une autre forme non symétrique de révolution, notamment polygonale.The relief 28 could be of another non-symmetrical form of revolution, in particular polygonal.

La contre-bride 3 présente encore, comme on peut le voir sur la figure 5, une face extérieure 29 bombée vers l'extérieur, de profil aérodynamique, afin de créer le moins de turbulences possibles lors de la rotation du ventilateur.The counter-flange 3 still presents, as can be seen on the figure 5 , an outwardly curved outer face 29 of aerodynamic profile, in order to create the least possible turbulence during the rotation of the fan.

La contre-bride 3 présente une forme générale de losange et comporte deux encoches 30 opposées, situées sensiblement sur une diagonale du losange, pour recevoir des outils de montage et permettre un montage plus aisé de la pale 1 correspondante sur le moyeu 9.The counter-flange 3 has a general diamond shape and has two opposite notches 30 located substantially on a diagonal of the rhombus to receive mounting tools and allow easier mounting of the corresponding blade 1 on the hub 9.

Bien entendu, l'invention n'est pas limitée à l'exemple qui vient d'être décrit.Of course, the invention is not limited to the example just described.

On peut notamment modifier la forme des brides et des contre-brides. Ces dernières peuvent par exemple coopérer différemment avec les brides, avec par exemple un relief en saillie sur les contre-brides venant s'engager dans un relief en creux des brides.In particular, the shape of the flanges and counter-flanges can be modified. The latter may for example cooperate differently with the flanges, with for example a protruding projection on the counter-flanges coming into a recessed hollow flanges.

Bien entendu, on ne sort pas du cadre de la présente invention si le moyeu n'est pas monolithique, mais par exemple composé d'une pluralité de secteurs, notamment d'autant de secteurs que de pales. Dans ce cas, chaque bride et le secteur associé peut être monolithique. Il peut par exemple être réalisé par injection, par exemple d'aluminium, ou encore par injection de matière plastique sous pression. Chaque secteur peut être assemblé sur le moyeu par des vis. Le moyeu peut par exemple comporter une partie centrale servant de support aux secteurs, les brides étant monolithiques avec les secteurs.Of course, it is not beyond the scope of the present invention if the hub is not monolithic, but for example composed of a plurality of sectors, including as many sectors as blades. In this case, each flange and the associated sector can be monolithic. It may for example be made by injection, for example of aluminum, or by injection of plastic material under pressure. Each sector can be assembled on the hub by screws. The hub may for example comprise a central portion serving as a support for the sectors, the flanges being monolithic with the sectors.

Une telle configuration permet d'utiliser des moules pour l'injection moins complexes, donc moins coûteux, et de permettre une certaine modularité, par exemple en variant le nombre de pales.Such a configuration makes it possible to use molds for injection that are less complex, and therefore less expensive, and to allow a certain degree of modularity, for example by varying the number of blades.

En variante encore, on pourrait utiliser deux demi-moyeux généralement discoïdes, et disposer les pales entre ces deux demi-moyeux. En utilisant des brides à base cylindrique, on peut aisément faire varier l'inclinaison des pales par rapport à l'axe de rotation du moyeu en desserrant les demi-moyeux et en faisant tourner les bases des brides dans leur logement.In another variant, one could use two half-hubs generally discoid, and arrange the blades between these two half-hubs. By using cylindrical base flanges, it is easy to vary the inclination of the blades relative to the axis of rotation of the hub by loosening the half-hubs and rotating the bases of the flanges in their housing.

Un moyeu non monolithique peut par exemple permettre la fabrication d'hélices de plus grand diamètre, ou encore d'hélices dont le nombre ou l'orientation des pales peut être modifié.A non-monolithic hub can for example allow the manufacture of larger diameter propellers, or propellers whose number or orientation of the blades can be modified.

Le ventilateur selon l'invention peut convenir à diverses applications industrielles et notamment être différent d'un ventilateur de plafond.The fan according to the invention may be suitable for various industrial applications and in particular be different from a ceiling fan.

Dans toute la description, y compris les revendications, l'expression « comportant un » doit être comprise comme étant synonyme de « comportant au moins un », sauf si le contraire est spécifié.Throughout the description, including the claims, the phrase "having one" should be understood as being synonymous with "having at least one", unless the opposite is specified.

Claims (24)

  1. Fan comprising:
    - at least two blades (1),
    - a hub (9) containing at least two flanges (2) for fixing the blades (1) to the hub,
    - at least two counterflanges (3), each associated with a flange, and
    - a clamping device (4) to hold each blade (1) between a flange (2) and the associated counterflange (3),
    characterised in that the flanges are tilted in relation to the axis of rotation (X) of the hub, each generally extending in a plane in which the normal is not parallel to the axis of rotation.
  2. Fan according to the foregoing claim, characterised in that the clamping device (4) contains at least one screw (5).
  3. Fan according to any of the foregoing claims, characterised in that the screw (5) is self-forming.
  4. Fan according to any of the foregoing claims, characterised in that the hub (9) is monolithic.
  5. Fan according to the foregoing claim, characterised in that the hub (9) is produced by injection, particularly of aluminium.
  6. Fan according to any of claims 1 to 3, in which the hub is non monolithic and in particular consists of a plurality of sections.
  7. Fan according to the foregoing claim, in which at least one flange and the associated section are monolithic.
  8. Fan according to claim 6, in which the hub consists of two generally discoid hub halves.
  9. Fan according to any of the foregoing claims, characterised in that the counterflange (3) is monolithic and is obtained by injection, particularly of aluminium,
  10. Fan according to any of the foregoing claims, characterised in that it contains between 2 and 12, or between 4 and 10, particularly between 5 and 8 blades.
  11. Fan according to any of the foregoing claims, characterised in that it contains 7 blades.
  12. Fan according to the foregoing claim, characterised in that the flange (2) has a hole (10) with an axis perpendicular to the plane of the flange.
  13. Fan according to any of the foregoing claims, characterised in that the clamping device (4) contains a single screw (5) for each blade.
  14. Fan according to the foregoing claim, characterised in that the clamping device contains at least one washer (6) inserted between a head of the screw (5) and the flange (2).
  15. Fan according to the foregoing claim, characterised in that the flange contains a recess (11) to take the washer (6).
  16. Fan according to any of the foregoing claims, characterised in that the counterflange (3) contains a body (27) arranged to engage in a hole (10) in the flange (2).
  17. Fan according to either of the two foregoing claims, characterised in that the counterflange (3) contains on its inner face (26) a first relief (28) configured to cooperate with a second relief (14) formed on the opposite face (13) of the flange (2).
  18. Fan according to the foregoing claim, characterised in that the first relief (28) is a reinforcement.
  19. Fan according to either of the two foregoing claims, characterised in that the first relief (28) has a non-symmetrical revolving form.
  20. Fan according to any of claims 17 to 19, characterised in that the first relief (28) has tilted sides (32).
  21. Fan according to any of claims 17 to 20, characterised in that the second relief (14) has a generally truncated pyramidal form, particularly four-sided.
  22. Fan according to any of the foregoing claims, characterised in that the counterflange (3) has an outer face (29) rounded outwards.
  23. Fan according to any of the foregoing claims, characterised in that the counterflange (3) contains two opposite notches (30).
  24. Fan according to the foregoing claim, characterised in that the counterflange (3) is generally diamond shaped and in that the two notches (30) are arranged approximately on a diagonal of the diamond.
EP05300100A 2004-03-01 2005-02-08 Fan Revoked EP1571345B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0402100A FR2866930B1 (en) 2004-03-01 2004-03-01 FAN COMPRISING AT LEAST ONE FLANGE-FIXED BLADE AND COUNTER-FLANGE
FR0402100 2004-03-01

Publications (2)

Publication Number Publication Date
EP1571345A1 EP1571345A1 (en) 2005-09-07
EP1571345B1 true EP1571345B1 (en) 2008-10-08

Family

ID=34746473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05300100A Revoked EP1571345B1 (en) 2004-03-01 2005-02-08 Fan

Country Status (5)

Country Link
EP (1) EP1571345B1 (en)
AT (1) ATE410605T1 (en)
DE (1) DE602005010135D1 (en)
ES (1) ES2314600T3 (en)
FR (1) FR2866930B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006011899U1 (en) 2006-08-03 2007-12-13 Ebm-Papst Mulfingen Gmbh & Co. Kg fan wheel
EP2025947B1 (en) * 2007-07-31 2013-02-27 R.E.M. Holding S.R.L. Hub-profile connection system for axial fan and axial fan provided with this connection system
CN104235066A (en) * 2014-10-10 2014-12-24 江苏富丽华通用设备有限公司 External rotor axial flow fan
CN107171467A (en) * 2017-07-19 2017-09-15 广东泛仕达机电有限公司 A kind of motor alclad rotor structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3941691A1 (en) * 1989-12-18 1990-07-12 Ziehl Abegg Gmbh & Co Kg Fan driven by electric motor with external rotor - has fan blades individually fastened to hum of motor rotor
US5304037A (en) * 1993-04-14 1994-04-19 Hunter Fan Company Ceiling fan blade vibration isolation system
EP0979948B1 (en) * 1998-08-10 2003-07-02 San-Chi Wu Fan blade assembly of a ceiling fan
US6821091B2 (en) * 2002-06-05 2004-11-23 Litex Industries Inc. Securing device

Also Published As

Publication number Publication date
DE602005010135D1 (en) 2008-11-20
EP1571345A1 (en) 2005-09-07
FR2866930B1 (en) 2008-02-15
ATE410605T1 (en) 2008-10-15
ES2314600T3 (en) 2009-03-16
FR2866930A1 (en) 2005-09-02

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