EP2697517B1 - Propeller of a pulsed airflow generator, in particular for a portable blower - Google Patents

Propeller of a pulsed airflow generator, in particular for a portable blower Download PDF

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Publication number
EP2697517B1
EP2697517B1 EP12721327.0A EP12721327A EP2697517B1 EP 2697517 B1 EP2697517 B1 EP 2697517B1 EP 12721327 A EP12721327 A EP 12721327A EP 2697517 B1 EP2697517 B1 EP 2697517B1
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EP
European Patent Office
Prior art keywords
propeller
parts
hub
propeller according
air intake
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Application number
EP12721327.0A
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German (de)
French (fr)
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EP2697517A1 (en
Inventor
Roger Pellenc
Philippe Gilbert
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Pellenc SAS
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Pellenc SAS
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Classifications

    • 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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • 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
    • 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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • F04D29/646—Mounting or removal of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F05D2300/12—Light metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates to a propeller for a pulsed air flow generator, in particular for a portable blower. More particularly interestingly, it is applicable to portable blowers. Such devices are commonly used to "sweep up" dead leaves or various rubbish that can cover various surfaces such as lawns, urban traffic routes, outdoor parking lots, sports fields, playgrounds, etc.
  • the invention also relates to portable devices, in particular autonomous portable blowers comprising a pulsed air flow generator making use of this method and this propeller.
  • Axial fans used in the production of blowing machines comprise a helix consisting of a plurality of radial blades, straight or twisted, attached via their base to a central hub.
  • Blowers using straight-blade propellers have disadvantages in particular a low yield, so it is often preferred to use propellers consisting of twisted blades having a better. performance.
  • each blade acts a bit like an airplane wing. At the entrance to the air, it presents a leading edge and, at the exit of the air, a trailing edge. In order to function optimally, it is necessary that the air arrives substantially perpendicular to the leading edge.
  • the fan in application of the principle of the triangle of velocities ( Figures 8, 8A, 8B ), it is sought to create, via the rotation of the fan, an air flow velocity Va as homogeneous as possible over the entire surface of the fan and thus obtain a speed Va.
  • the document US-2010/0074761 describes a propellant propeller constituted by the assembly of two pieces coaxially contiguous one after the other, that is to say: a first anterior part formed in a single block and consisting of a plurality of twisted blades attached to a ring central, a second posterior piece of conical general shape also formed of a single block.
  • the two pieces are assembled by engagement of the base of the blades of the propeller in slots that has the second rear piece.
  • the central portion of this assembly is in the form of a truncated cone whose apex is constituted by a relatively large flat area disturbing the aerodynamics of the air inlet.
  • the document US 4462757 discloses a cooling fan propeller also constituted by the assembly of two pieces coaxially contiguous one after the other, ie: a first anterior piece formed integrally and consisting of a plurality of twisted blades attached to a central ring, a second rear part of conical general shape also formed of a single block. The two pieces are assembled by means of screws.
  • the central portion of this assembly has the shape of a truncated cone whose apex is also constituted by a relatively large flat area disturbing the aerodynamics of the air inlet.
  • the document DE-28 55 909 also describes a propeller for an internal combustion engine cooling fan constituted by the assembly of two pieces coaxially contiguous one after the other, ie: a first an anterior piece formed of a single block and consisting of a plurality of twisted blades attached to a central ring, a second rear part of conical general shape also formed of a single block.
  • the first and second parts are also assembled by means of a plurality of screws.
  • the central portion of this assembly has the shape of a truncated cone whose apex is also constituted by a relatively large flat area disturbing the aerodynamics of the air inlet.
  • An object of the present invention is to provide a propeller free from the aforementioned drawbacks.
  • the front part of the clamping device has a conical shape and constitutes the top of the air inlet cone.
  • the locking of the two parts of the hub in the clamping position is obtained by a forced engagement of the rear part of said hub in the anterior part thereof.
  • the hub comprises an axial bore for housing the end of the shaft of a drive motor, the end of the shaft being secured to the front part of the hub by forced engagement.
  • the anterior and posterior parts are assembled by embedding and the twisted blades are attached to the central ring by means of spaced blade legs and the rear piece comprises a plurality of spaced teeth or claws, engaged in the gaps between said blade roots.
  • the device according to the invention is also remarkable in that the outer surface of the blade roots and the outer surface of the teeth or claws constitute portions of the surface of the air intake cone, the junction lines of these external surfaces. being almost imperceptible, so that the assembly of these surfaces has the appearance of a continuous conical surface.
  • the invention also relates to a portable blower comprising an axial fan, characterized in that the helix of this axial fan comprises at least one of the main characteristics mentioned above.
  • anterior parts 2 and posterior 5 are assembled by embedding.
  • the twisted blades 3 are attached to the central ring 4 by means of spaced blade roots 3a and the rear part 5 has a plurality of teeth or claws 5a spaced, engaged in the intervals 7 arranged between said blade roots 3a.
  • the claws 5a of the rear part 5 have a straight edge oriented along a generatrix of the air intake cone or oriented obliquely with respect to this generator, and a curved opposite edge whose conformation corresponds to the surface of the blade roots with which this curved edge is in contact.
  • This complementary conformation of the claws 5a and the blade roots 3a allows a good assembly by embedding the anterior parts 2 and posterior 5.
  • the blade roots 3a to which is attached the base of the blades 3 have, laterally, a surface projecting on one side of said base.
  • the outer surface 8 of the protruding portion of the blade roots 3a and the outer surface 9 of the teeth or claws 5a constitute portions of the surface of the air inlet cone 6.
  • the anterior and posterior pieces 5 are obtained by molding using any suitable material and process, for example by an injection method known per se.
  • anterior parts 2 and posterior 5 are made of plastic or light metal, having the desired rigidity for their function.
  • a clamping device 10 (FIG. Figures 4 and 5 ) constituted by a hub comprising two parts 11 and 12 assembled coaxially and between which are clamped the two recessed portions 2, 5 constituting the helix 1.
  • the hub 10 is integral in rotation with the helix 1.
  • the cylindrical inner surface of the central ring 4 has, for this purpose, angularly spaced ribs 13 oriented parallel to its axis, while the cylindrical outer surface of the rear part 10 of the hub 9 has grooves 14 angularly spaced in which are engaged the ribs 13.
  • the front part 12 of the clamping hub 10 has a conically shaped front portion 12a disposed at the front of the truncated cone 6 and forming therewith an air inlet cone 6-12a. Said front portion 12a forming the apex of this air intake cone.
  • the locking of the two parts 11, 12 of the clamping hub 10 in the clamping position is preferably obtained by a forced engagement of the rear part 11 of said hub 10 in the front piece 12 of the latter.
  • the hub 10 has an axial bore 15 for housing the end 16a of the shaft of a drive motor 16, the end of the shaft being secured to the front piece 12 of the hub 10 by forced engagement.
  • shaft 16 is thus integral in rotation with the hub 10 which is itself integral in rotation with the propeller 1 itself.
  • the portable blower according to the invention is of the type comprising an axial fan.
  • this blower is remarkable in that the axial fan has the important characteristic features described above, or results from the implementation of the method according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

La présente invention concerne une hélice de générateur de flux d'air pulsé, en particulier pour souffleur portatif. De manière plus particulièrement intéressante, elle est applicable aux souffleurs électroportatifs. De tels appareils sont couramment utilisés pour « balayer » les feuilles mortes ou les détritus divers pouvant recouvrir des surfaces diverses telles que, pelouses, voies de circulation urbaines, parkings extérieurs, terrains de sport, aires de jeux, etc.The present invention relates to a propeller for a pulsed air flow generator, in particular for a portable blower. More particularly interestingly, it is applicable to portable blowers. Such devices are commonly used to "sweep up" dead leaves or various rubbish that can cover various surfaces such as lawns, urban traffic routes, outdoor parking lots, sports fields, playgrounds, etc.

L'invention vise aussi les appareils portatifs, en particulier les souffleurs portatifs autonomes comportant un générateur de flux d'air pulsé faisant application de ce procédé et de cette hélice.The invention also relates to portable devices, in particular autonomous portable blowers comprising a pulsed air flow generator making use of this method and this propeller.

Les ventilateurs axiaux utilisés dans la réalisation de machines soufflantes comprennent une hélice constituée d'une pluralité de pales radiales, droites ou vrillées, rattachées par l'intermédiaire de leur base à un moyeu central.Axial fans used in the production of blowing machines comprise a helix consisting of a plurality of radial blades, straight or twisted, attached via their base to a central hub.

Les machines soufflantes utilisant des hélices à pales droites ont notamment pour inconvénients un faible rendement, de sorte qu'il est souvent préféré d'utiliser des hélices constituées de pales vrillées ayant un meilleur. rendement.Blowers using straight-blade propellers have disadvantages in particular a low yield, so it is often preferred to use propellers consisting of twisted blades having a better. performance.

En effet, le profil de chaque pale agit un peu comme une aile d'avion. Il présente, à l'entrée de l'air, un bord d'attaque et, à la sortie de l'air, un bord de fuite. Afin de fonctionner de façon optimale, il faut que l'air arrive sensiblement perpendiculairement au bord d'attaque. D'autre part, pour avoir un fonctionnement optimal du ventilateur, en application du principe du triangle des vitesses (figures 8, 8A, 8B), on cherche à créer, via la rotation du ventilateur, un flux d'air de vitesse Va le plus possible homogène sur toute la surface du ventilateur et obtenir ainsi une vitesse Va. Or, si on considère le profil de pied de pale, celui-ci tourné autour de l'axe du ventilateur sensiblement à une vitesse VΩ égale à la vitesse de rotation multipliée par le rayon de pied de pale où est positionné ce profil. Ledit profil voit ainsi arriver l'air sur lui à une vitesse relative Vr. Si on considère le profil positionné en extrémité de pale, il génère lui aussi une vitesse d'air Va par la rotation de l'hélice, mais il tourne à la même vitesse de rotation multipliée par le rayon de sa position par rapport à l'axe du ventilateur, lequel est bien plus grand que le rayon en pied de pale. Il en résulte une vitesse relative de l'air Vr beaucoup plus grande mais possédant une orientation plus éloignée de l'axe du ventilateur qu'en pied de pale. Ce principe explique le fait qu'une hélice performante doit être constituée de pales vrillées, ce qui ne simplifié pas sa réalisation.Indeed, the profile of each blade acts a bit like an airplane wing. At the entrance to the air, it presents a leading edge and, at the exit of the air, a trailing edge. In order to function optimally, it is necessary that the air arrives substantially perpendicular to the leading edge. On the other hand, to have an optimal operation of the fan, in application of the principle of the triangle of velocities ( Figures 8, 8A, 8B ), it is sought to create, via the rotation of the fan, an air flow velocity Va as homogeneous as possible over the entire surface of the fan and thus obtain a speed Va. However, if we consider the blade root profile, it turned around the axis of the fan substantially at a speed VΩ equal to the rotational speed multiplied by the blade root radius where is this profile. Said profile thus sees air coming on it at a relative speed Vr. If we consider the profile positioned at the end of the blade, it also generates an air velocity goes through the rotation of the propeller, but it rotates at the same speed of rotation multiplied by the radius of its position relative to the axis of the fan, which is much larger than the radius at the foot of blade. This results in a much higher relative air velocity Vr but having an orientation further from the fan axis than at the foot of the blade. This principle explains the fact that a powerful propeller must be made of twisted blades, which does not simplify its realization.

De ce fait, on a tendance à positionner le début des pales le plus loin possible de l'axe de rotation afin de réduire le différentiel d'orientation de la vitesse Vr entre le pied de pale et le haut de pale, simplifiant tout de même la réalisation des pales. Mais, de ce fait, il faut intégrer devant l'hélice un cône permettant d'améliorer l'aérodynamique de l'entrée d'air. On comprend que la longueur de ce cône d'entrée d'air est proportionnelle au rayon du pied de pale, la longueur dudit cône croissant avec le rayon dudit pied de pale. Les ventilateurs nécessitant ce type de cône ont donc des encombrements plus importants, ce qui constitue un inconvénient certain pour les applications où on recherche des rendements élevés pour des appareils portatifs munis d'un générateur d'air pulsé présentant un volume réduit.As a result, there is a tendency to position the beginning of the blades as far as possible from the axis of rotation in order to reduce the orientation differential of the speed Vr between the blade root and the blade tip, all the same simplifying the realization of the blades. But, therefore, must be integrated in front of the propeller cone to improve the aerodynamics of the air intake. It is understood that the length of this air intake cone is proportional to the radius of the blade root, the length of said cone increasing with the radius of said blade root. Fans requiring this type of cone therefore have larger dimensions, which is a disadvantage for certain applications where high yields are sought for portable devices equipped with a pulsed air generator having a reduced volume.

Lorsqu'il s'agit de réaliser des machines soufflantes de grandes dimensions dont les pales sont fixées sur le moyeu central, soit par soudure, soit par des moyens mécaniques de fixation, leur construction ne soulève pas de gros problèmes.When it comes to producing large blower machines whose blades are fixed to the central hub, either by welding or by mechanical fixing means, their construction does not raise major problems.

En revanche, lorsque l'on souhaite appliquer de telles hélices à la réalisation de ventilateurs axiaux de dimensions réduites, telles que celles qui équipent les ventilateurs axiaux assurant la production du flux d'air pulsé dans les souffleurs de balayage et/ou de nettoyage plus spécialement visés par la présente invention, le moulage de telles hélices de petites dimensions devient pratiquement impossible, sauf à utiliser des matériels et des méthodes d'injection nécessitant l'emploi de moules très complexes (moules à tiroirs multiples). Il en résulte une augmentation du coût des outillages et, par conséquent, des produits fabriqués, et aussi une fragilité du moule et donc une diminution de sa durée de vie constituant un facteur d'augmentation supplémentaire du coût des pièces. La plupart du temps, une hélice de ce type ne peut être moulée avec les procédés et matériels existants, le concepteur est donc amené à faire un compromis sur la géométrie de l'hélice pour la rendre réalisable par moulage.On the other hand, when it is desired to apply such propellers to the realization of axial fans of reduced dimensions, such as those which equip the axial fans ensuring the production of the forced air flow in the blowers sweeping and / or cleaning more Specially targeted by the present invention, the molding of such small propellers becomes practically impossible, except to use materials and injection methods requiring the use of very complex molds (multi-drawer molds). This results in an increase in the cost of tools and, therefore, manufactured products, and also a fragility of the mold and therefore a decrease in its life constituting a factor of additional increase in the cost of parts. The most of the time, a propeller of this type can not be molded with the existing processes and materials, the designer is therefore led to make a compromise on the geometry of the propeller to make it achievable by molding.

De plus, les pièces obtenues par de tels matériels et méthodes peuvent souffrir d'un manque de précision et de variations importantes d'un lot à l'autre.In addition, the parts obtained by such materials and methods may suffer from a lack of precision and significant variations from one batch to another.

Il a été prévu de remédier à ces inconvénients en proposant des hélices axiales dont les pales sont rattachées à un moyeu cylindrique ou avec des pales dotées d'un vrillage réduit, ou par une réduction du nombre de pales, au détriment du rendement des hélices ainsi obtenues.It has been planned to remedy these drawbacks by proposing axial propellers whose blades are attached to a cylindrical hub or with blades having a reduced twisting, or by a reduction in the number of blades, to the detriment of the efficiency of the propellers as well. obtained.

Le document US-2010/0074761 décrit une hélice propulsive constituée par l'assemblage de deux pièces accolées coaxialement l'une à la suite de l'autre, soit : une première pièce antérieure formée d'un seul bloc et constituée d'une pluralité de pales vrillées rattachées à une bague centrale, une deuxième pièce postérieure de forme générale conique également formée d'un seul bloc. Les deux pièces sont assemblées par engagement de la base des pales de l'hélice dans des fentes que présente la deuxième pièce postérieure. La partie centrale de cet assemblage présente la forme d'un cône tronqué dont le sommet est constitué par une plage plane relativement importante perturbant l'aérodynamisme de l'entrée d'air.The document US-2010/0074761 describes a propellant propeller constituted by the assembly of two pieces coaxially contiguous one after the other, that is to say: a first anterior part formed in a single block and consisting of a plurality of twisted blades attached to a ring central, a second posterior piece of conical general shape also formed of a single block. The two pieces are assembled by engagement of the base of the blades of the propeller in slots that has the second rear piece. The central portion of this assembly is in the form of a truncated cone whose apex is constituted by a relatively large flat area disturbing the aerodynamics of the air inlet.

Le document US-4,462,757 divulgue une hélice de ventilateur de refroidissement également constituée par l'assemblage de deux pièces accolées coaxialement l'une à la suite de l'autre, soit : une première pièce antérieure formée d'un seul bloc et constituée d'une pluralité de pales vrillées rattachées à une bague centrale, une deuxième pièce postérieure de forme générale conique également formée d'un seul bloc. Les deux pièces sont assemblées au moyen de vis. La partie centrale de cet assemblage présente la forme d'un cône tronqué dont le sommet est également constitué par une plage plane relativement importante perturbant l'aérodynamisme de l'entrée d'air.The document US 4462757 discloses a cooling fan propeller also constituted by the assembly of two pieces coaxially contiguous one after the other, ie: a first anterior piece formed integrally and consisting of a plurality of twisted blades attached to a central ring, a second rear part of conical general shape also formed of a single block. The two pieces are assembled by means of screws. The central portion of this assembly has the shape of a truncated cone whose apex is also constituted by a relatively large flat area disturbing the aerodynamics of the air inlet.

Le document DE-28 55 909 décrit aussi une hélice pour ventilateur de refroidissement de moteur à combustion interne constituée par l'assemblage de deux pièces accolées coaxialement l'une à la suite de l'autre, soit : une première pièce antérieure formée d'un seul bloc et constituée d'une pluralité de pales vrillées rattachées à une bague centrale, une deuxième pièce postérieure de forme générale conique également formée d'un seul bloc. Selon ce document, les première et deuxième pièces sont également assemblées au moyen d'une pluralité de vis. La partie centrale de cet assemblage présente la forme d'un cône tronqué dont le sommet est également constitué par une plage plane relativement importante perturbant l'aérodynamisme de l'entrée d'air.The document DE-28 55 909 also describes a propeller for an internal combustion engine cooling fan constituted by the assembly of two pieces coaxially contiguous one after the other, ie: a first an anterior piece formed of a single block and consisting of a plurality of twisted blades attached to a central ring, a second rear part of conical general shape also formed of a single block. According to this document, the first and second parts are also assembled by means of a plurality of screws. The central portion of this assembly has the shape of a truncated cone whose apex is also constituted by a relatively large flat area disturbing the aerodynamics of the air inlet.

Un but de la présente invention vise à proposer une hélice exempte des inconvénients susmentionnés.An object of the present invention is to provide a propeller free from the aforementioned drawbacks.

Selon l'invention, ce but est atteint grâce à une hélice de générateur de flux d'air pulsé, en particulier pour souffleur portatif, du genre constituée par l'assemblage de deux pièces accolées coaxialement l'une à la suite de l'autre, soit :

  • une première pièce antérieure formée d'un seul bloc et constituée d'une pluralité de pales vrillées rattachées à une bague centrale,
  • et une deuxième pièce postérieure de forme générale conique également formée d'un seul bloc,
la partie centrale de cet assemblage présentant une forme conique et constituant la partie postérieure d'un cône d'entrée d'air, cette hélice étant remarquable en ce que lesdites première pièce antérieure et deuxième pièce postérieure sont solidarisées au moyen d'un dispositif de serrage constitué par un moyeu comprenant deux pièces assemblées coaxialement, de préférence par emboitement, et entre lesquelles sont serrées lesdites deux parties constitutives de l'hélice, ledit moyeu étant solidaire en rotation de cette dernière et assurant le maintien en position d'assemblage desdites pièces antérieure et postérieure.According to the invention, this object is achieved by means of a propeller for a pulsed air flow generator, in particular for a portable blower, of the type constituted by the assembly of two pieces coaxially contiguous one after the other , is :
  • a first anterior piece formed in one piece and consisting of a plurality of twisted blades attached to a central ring,
  • and a second posterior piece of generally conical shape also formed of a single block,
the central part of this assembly having a conical shape and constituting the rear part of an air intake cone, this helix being remarkable in that the said first anterior part and the second posterior part are secured by means of a device clamping constituted by a hub comprising two parts assembled coaxially, preferably by interlocking, and between which are clamped said two constituent parts of the helix, said hub being integral in rotation with the latter and ensuring the holding in assembly position of said parts anterior and posterior.

Selon un mode d'exécution avantageux, la pièce antérieure du dispositif de serrage présente une forme conique et constitue le sommet du cône d'entrée d'air.According to an advantageous embodiment, the front part of the clamping device has a conical shape and constitutes the top of the air inlet cone.

Selon un mode de réalisation avantageux, le blocage des deux pièces du moyeu dans la position de serrage est obtenu par un emboitement forcé de la pièce postérieure dudit moyeu dans la pièce antérieure de ce dernier.According to an advantageous embodiment, the locking of the two parts of the hub in the clamping position is obtained by a forced engagement of the rear part of said hub in the anterior part thereof.

Selon un mode de réalisation préféré, le moyeu comporte un alésage axial permettant le logement de l'extrémité de l'arbre d'un moteur d'entrainement, l'extrémité de l'arbre étant solidarisée à la pièce antérieure du moyeu par engagement forcé.According to a preferred embodiment, the hub comprises an axial bore for housing the end of the shaft of a drive motor, the end of the shaft being secured to the front part of the hub by forced engagement. .

Selon un mode de mise en oeuvre avantageux, les pièces antérieure et postérieure sont assemblées par encastrement et les pales vrillées sont rattachées à la bague centrale par l'intermédiaire de pieds de pales espacés et la pièce postérieure comporte une pluralité de dents ou griffes espacées, engagées dans les intervalles ménagés entre lesdits pieds de pales.According to an advantageous embodiment, the anterior and posterior parts are assembled by embedding and the twisted blades are attached to the central ring by means of spaced blade legs and the rear piece comprises a plurality of spaced teeth or claws, engaged in the gaps between said blade roots.

Le dispositif selon l'invention est encore remarquable en ce que la surface externe des pieds de pales et la surface externe des dents ou griffes constituent des portions de la surface du cône d'entrée d'air, les lignes de jonction de ces surfaces externes étant quasiment imperceptibles, de sorte que l'assemblage de ces surfaces présente l'aspect d'une surface conique continue.The device according to the invention is also remarkable in that the outer surface of the blade roots and the outer surface of the teeth or claws constitute portions of the surface of the air intake cone, the junction lines of these external surfaces. being almost imperceptible, so that the assembly of these surfaces has the appearance of a continuous conical surface.

L'invention vise également un souffleur portatif comportant un ventilateur axial, caractérisé en ce que l'hélice de ce ventilateur axial comprend au moins l'une des principales caractéristiques susmentionnées.The invention also relates to a portable blower comprising an axial fan, characterized in that the helix of this axial fan comprises at least one of the main characteristics mentioned above.

Le dispositif selon l'invention procure plusieurs avantages intéressants. Notamment :

  • de permettre la réalisation d'une géométrie d'hélice complexe avec un procédé de fabrication simple ;
  • ce procédé permet une bonne répétabilité de la qualité des parties constitutives de l'hélice ;
  • de permettre d'obtenir des pièces ne nécessitant pas d'équilibrage en sortie de moule ;
  • un coût limité des outillages et un faible prix de revient des hélices obtenues ;
  • l'obtention d'hélice de petites dimensions au rendement optimisé.
The device according to the invention provides several interesting advantages. Especially :
  • to allow the realization of a complex helix geometry with a simple manufacturing process;
  • this process allows a good repeatability of the quality of the constituent parts of the propeller;
  • to make it possible to obtain parts that do not require balancing at the outlet of the mold;
  • a limited cost of tools and a low cost price of the propellers obtained;
  • obtaining small propellers with optimized efficiency.

Les buts, caractéristiques et avantages ci-dessus, et d'autres encore, ressortiront mieux de la description détaillée qui suit et des dessins annexés dans lesquels :

  • La figure 1 est une vue en perspective d'un exemple d'hélice axiale réalisée selon l'invention.
  • La figure 2 est une vue en perspective éclatée des deux pièces constitutives de l'hélice dont le moyeu d'assemblage n'est pas représenté.
  • La figure 3 est également une vue en perspective des deux pièces constitutives de l'hélice vues sous un autre angle.
  • La figure 4 est une vue en perspective éclatée du moyeu d'assemblage.
  • La figure 5 est une vue en coupe axiale de ce moyeu représenté en position assemblée.
  • La figure 6 est une vue partielle en coupe axiale montrant les deux parties constitutives assemblées parle moyeu et de l'arbre d'entraînement.
  • La figure 7 est une vue en coupe transversale de la partie centrale de l'hélice et montrant les moyens d'entrainement en rotation.
  • Les figures 8, 8A et 8B illustrent une application du principe du triangle des vitesses.
  • La figure 8 est une vue en plan à caractère schématique d'une hélice à pales vrillées.
  • La figure 8A est une vue en coupe selon la ligne A-A de la figure 8.
  • La figure 8B est une vue en coupe selon la ligne B-B de la figure 8.
The above and other objects, features and advantages will become more apparent from the following detailed description and accompanying drawings in which:
  • The figure 1 is a perspective view of an example of an axial helix produced according to the invention.
  • The figure 2 is an exploded perspective view of the two constituent parts of the propeller whose assembly hub is not shown.
  • The figure 3 is also a perspective view of the two constituent parts of the propeller viewed from another angle.
  • The figure 4 is an exploded perspective view of the assembly hub.
  • The figure 5 is an axial sectional view of this hub shown in the assembled position.
  • The figure 6 is a partial view in axial section showing the two component parts assembled by the hub and the drive shaft.
  • The figure 7 is a cross-sectional view of the central portion of the helix and showing the rotating drive means.
  • The Figures 8, 8A and 8B illustrate an application of the triangle principle.
  • The figure 8 is a schematic plan view of a twisted blade propeller.
  • The figure 8A is a sectional view along line AA of the figure 8 .
  • The Figure 8B is a sectional view along line BB of the figure 8 .

On se réfère auxdits dessins pour décrire un exemple intéressant quoique nullement limitatif, de réalisation de l'hélice selon l'invention.Referring to said drawings to describe an interesting example, although not limiting, of embodiment of the propeller according to the invention.

L'hélice 1 axiale à haut rendement selon l'invention est constituée par l'assemblage de deux pièces accolées coaxialement l'une à la suite de l'autre, soit :

  • une première pièce antérieure 2 formée d'un seul bloc et constituée d'une pluralité de pales vrillées 3 rattachées à une bague centrale 4,
  • et une deuxième pièce postérieure 5 de forme générale conique également formée d'un seul bloc,
la partie centrale 6 de cet assemblage présentant une forme conique continue ou plus exactement la forme d'un tronc de cône constituant la partie postérieure d'un cône d'entrée d'air.The high-efficiency axial propeller 1 according to the invention consists of assembling two pieces coaxially contiguous one after the other, namely:
  • a first anterior piece 2 formed integrally and consisting of a plurality of twisted blades 3 attached to a central ring 4,
  • and a second rear part 5 of generally conical shape also formed of a single block,
the central portion 6 of this assembly having a continuous conical shape or more exactly the shape of a truncated cone constituting the rear part of an air inlet cone.

Avantageusement, les pièces antérieure 2 et postérieure 5 sont assemblées par encastrement.Advantageously, the anterior parts 2 and posterior 5 are assembled by embedding.

Suivant un mode d'exécution intéressant, les pales vrillées 3 sont rattachées à la bague centrale 4 par l'intermédiaire de pieds de pales 3a espacés et la pièce postérieure 5 comporte une pluralité de dents ou griffes 5a espacées, engagées dans les intervalles 7 ménagés entre lesdits pieds de pales 3a.According to an interesting embodiment, the twisted blades 3 are attached to the central ring 4 by means of spaced blade roots 3a and the rear part 5 has a plurality of teeth or claws 5a spaced, engaged in the intervals 7 arranged between said blade roots 3a.

Les griffes 5a de la pièce postérieure 5 présentent un bord droit orienté selon une génératrice du cône d'entrée d'air ou orienté obliquement par rapport à cette génératrice, et un bord opposé courbe dont la conformation correspond à la surface des pieds de pale avec laquelle ce bord courbe se trouve en contact. Cette conformation complémentaire des griffes 5a et des pieds de pales 3a permet un bon assemblage par encastrement des pièces antérieure 2 et postérieure 5.The claws 5a of the rear part 5 have a straight edge oriented along a generatrix of the air intake cone or oriented obliquely with respect to this generator, and a curved opposite edge whose conformation corresponds to the surface of the blade roots with which this curved edge is in contact. This complementary conformation of the claws 5a and the blade roots 3a allows a good assembly by embedding the anterior parts 2 and posterior 5.

Les pieds de pales 3a auxquels est rattachée la base des pales 3 présentent, latéralement, une surface débordant sur l'un des cotés de ladite base. La surface externe 8 de la partie débordante des pieds de pales 3a et la surface externe 9 des dents ou griffes 5a constituent des portions de la surface du cône d'entrée d'air 6.The blade roots 3a to which is attached the base of the blades 3 have, laterally, a surface projecting on one side of said base. The outer surface 8 of the protruding portion of the blade roots 3a and the outer surface 9 of the teeth or claws 5a constitute portions of the surface of the air inlet cone 6.

De préférence, les pièces antérieure 2 et postérieure 5 sont obtenues par moulage au moyen de tout matériel et procédé convenables, par exemple par un procédé d'injection connu en soi.Preferably, the anterior and posterior pieces 5 are obtained by molding using any suitable material and process, for example by an injection method known per se.

De manière avantageuse, les pièces antérieure 2 et postérieure 5 sont exécutées en matière plastique ou en métal léger, présentant la rigidité souhaitable pour leur fonction.Advantageously, the anterior parts 2 and posterior 5 are made of plastic or light metal, having the desired rigidity for their function.

Selon l'invention, le maintien en position d'assemblage des pièces antérieure 2 et postérieure 5 est réalisé par un dispositif de serrage 10 (figures 4 et 5) constitué par un moyeu comprenant deux pièces 11 et 12 assemblées coaxialement et entre lesquelles sont serrées les deux parties encastrées 2, 5 constitutives de l'hélice 1.According to the invention, the holding in the assembly position of the anterior and posterior parts 5 is achieved by a clamping device 10 (FIG. Figures 4 and 5 ) constituted by a hub comprising two parts 11 and 12 assembled coaxially and between which are clamped the two recessed portions 2, 5 constituting the helix 1.

Le moyeu 10 est solidaire en rotation de l'hélice 1. Par exemple, la surface interne cylindrique de la bague centrale 4 présente, à cet effet, des nervures angulairement espacées 13 orientées parallèlement à son axe, tandis que la surface externe cylindrique de la pièce postérieure 10 du moyeu 9 comporte des rainures 14 angulairement espacées dans lesquelles sont engagées les nervures 13.The hub 10 is integral in rotation with the helix 1. For example, the cylindrical inner surface of the central ring 4 has, for this purpose, angularly spaced ribs 13 oriented parallel to its axis, while the cylindrical outer surface of the rear part 10 of the hub 9 has grooves 14 angularly spaced in which are engaged the ribs 13.

Selon l'exemple illustré, la pièce antérieure 12 du moyeu de serrage 10 présente une portion avant 12a de forme conique disposée à l'avant du tronc de cône 6 et constituant avec ce dernier un cône d'entrée d'air 6-12a. Ladite portion avant 12a formant le sommet de ce cône d'entrée d'air.According to the illustrated example, the front part 12 of the clamping hub 10 has a conically shaped front portion 12a disposed at the front of the truncated cone 6 and forming therewith an air inlet cone 6-12a. Said front portion 12a forming the apex of this air intake cone.

Le blocage des deux pièces 11, 12 du moyeu de serrage 10 dans la position de serrage est obtenu, de préférence, par un emboitement forcé de la pièce postérieure 11 dudit moyeu 10 dans la pièce antérieure 12 de ce dernier.The locking of the two parts 11, 12 of the clamping hub 10 in the clamping position is preferably obtained by a forced engagement of the rear part 11 of said hub 10 in the front piece 12 of the latter.

Le moyeu 10 comporte un alésage axial 15 permettant le logement de l'extrémité 16a de l'arbre d'un moteur d'entrainement 16, l'extrémité de l'arbre étant solidarisée à la pièce antérieure 12 du moyeu 10 par engagement forcé.The hub 10 has an axial bore 15 for housing the end 16a of the shaft of a drive motor 16, the end of the shaft being secured to the front piece 12 of the hub 10 by forced engagement.

On comprend que l'arbre 16 est ainsi solidaire en rotation du moyeu 10 lequel est lui-même solidaire en rotation de l'hélice 1 proprement dite.It is understood that the shaft 16 is thus integral in rotation with the hub 10 which is itself integral in rotation with the propeller 1 itself.

Le souffleur portatif selon l'invention est du genre comprenant un ventilateur axial.The portable blower according to the invention is of the type comprising an axial fan.

Selon l'invention, ce souffleur est remarquable en ce que le ventilateur axial présente les dispositions caractéristiques importantes précédemment décrites, ou résulte de la mise en oeuvre du procédé selon l'invention.According to the invention, this blower is remarkable in that the axial fan has the important characteristic features described above, or results from the implementation of the method according to the invention.

Claims (12)

  1. Propeller (1) of a pulsed airflow generator, in particular for an autonomous portable blower, of the type constituted by the assembly of two parts coaxially placed one behind the other, namely:
    - a first front part (2) formed from a single block and consisting of a plurality of twisted blades (3) fastened to a central ring (4),
    - and a second back part (5) of a generally conical shape, also formed from a single block,
    the central part (6) of this assembly presenting a conical shape and constituting the back part of an air intake cone, this propeller being characterised in that the said first front part and second back part are interlocked by means of a clamping device (10) consisting of a hub incorporating two parts (11, 12), coaxially assembled, and between which said two parts (2, 5) constituting the propeller (1) are clamped, said hub being rotationally integral with this latter and ensuring that the said front and back parts are held in the assembly position.
  2. Propeller according to Claim 1, characterised in that front part (12) of clamping device (10) presents a conical shape and constitutes the top of air intake cone (6-12a).
  3. Propeller according to either one of Claims 1 or 2, characterised in that the two parts (11, 12) constituting clamping device (10) or hub are assembled by fitting into each other.
  4. Propeller according to either one of Claims 1 or 2, characterised in that locking of the two parts (11, 12) of hub (10) in the clamping position is obtained by forced fitting of back part (11) of said hub into front part (12) of this latter.
  5. Propeller according to any one of Claims 1 to 4, characterised in that hub (10) includes an axial bore (15) in which is lodged the extremity (16a) of shaft (16) of a driving motor, the extremity of the shaft being interlocked with front part (12) of hub (10) by forced insertion.
  6. Propeller according to any one of Claims 1 to 5, characterised in that front (2) and back (5) parts are assembled by embedding.
  7. Propeller according to any one of Claims 1 to 6, characterised in that twisted blades (3) are fastened to central ring (4) by means of spaced blade feet (3a) and in that back part (5) includes a plurality of spaced teeth or claws (5a), inserted in gaps (7) recessed between said blade feet.
  8. Propeller according to Claim 7, characterised in that claws (5a) of back part (5) present a straight edge oriented along a generatrix of the air intake cone or oriented obliquely in relation to this generatrix, and an opposite curved edge whose shaping corresponds to the surface of the blade feet with which this curved edge is in contact.
  9. Propeller according to one of Claims 7 or 8, characterised in that blade feet (3a), to which the bases of blades 3 are fastened, laterally present surfaces projecting over one of the sides of said base, outer surface (8) of the projecting part of blade feet (3a) and outer surface (9) of teeth or claws (5a) constituting portions of the surface of air intake cone (6).
  10. Propeller according to any one of Claims 1 to 9, characterised in that front (2) and back (5) parts are obtained by moulding.
  11. Propeller according to any one of Claims 1 to 10, characterised in that front (2) and back (5) parts are executed in a rigid plastic material or light alloy.
  12. Portable blower including an axial fan, characterised in that the propeller of this axial fan is embodied according to any one of Claims 1 to 11.
EP12721327.0A 2011-04-11 2012-04-05 Propeller of a pulsed airflow generator, in particular for a portable blower Active EP2697517B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1101102A FR2973847B1 (en) 2011-04-11 2011-04-11 AIR FLOW GENERATOR PROPELLER, ESPECIALLY FOR PORTABLE BLOWER.
PCT/FR2012/000128 WO2012140336A1 (en) 2011-04-11 2012-04-05 Propeller of a pulsed airflow generator, in particular for a portable blower

Publications (2)

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EP2697517A1 EP2697517A1 (en) 2014-02-19
EP2697517B1 true EP2697517B1 (en) 2016-03-16

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EP (1) EP2697517B1 (en)
JP (1) JP5992503B2 (en)
CN (1) CN103562559B (en)
DK (1) DK2697517T3 (en)
FR (1) FR2973847B1 (en)
WO (1) WO2012140336A1 (en)

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EP2697517A1 (en) 2014-02-19
DK2697517T3 (en) 2016-05-09
CN103562559A (en) 2014-02-05
US20140105749A1 (en) 2014-04-17
FR2973847B1 (en) 2015-10-30
CN103562559B (en) 2016-01-20
JP2014510876A (en) 2014-05-01
US10001135B2 (en) 2018-06-19
FR2973847A1 (en) 2012-10-12
WO2012140336A1 (en) 2012-10-18
JP5992503B2 (en) 2016-09-14

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