EP3328237B1 - Hair dryer having coanda effect air outlet - Google Patents

Hair dryer having coanda effect air outlet Download PDF

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Publication number
EP3328237B1
EP3328237B1 EP16744816.6A EP16744816A EP3328237B1 EP 3328237 B1 EP3328237 B1 EP 3328237B1 EP 16744816 A EP16744816 A EP 16744816A EP 3328237 B1 EP3328237 B1 EP 3328237B1
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EP
European Patent Office
Prior art keywords
hair dryer
channel
air
neck
duct
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EP16744816.6A
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German (de)
French (fr)
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EP3328237A1 (en
Inventor
Valentin JAVELLE
Nicolas Lauchet
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SEB SA
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SEB SA
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    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands

Definitions

  • the present invention relates to the field of hair dryers and aims to provide significant drying and feeling performance, while reducing the noise of the appliance.
  • hair dryers have included an air inlet area, an air circulation chamber, an air outlet area, an air circulation system, and a heating element.
  • the air circulation system and the heating element are integrated in the circulation chamber.
  • the air circulation system draws the air from outside through the inlet zone then conveys this air into the circulation chamber, from upstream to downstream, passing through the heating element, the more or less heated air then being blown outside through the exit zone, so as to dry the hair.
  • the hair dryer configured to amplify the output air flow.
  • the hair dryer includes an outlet head configured to create a Coanda effect producing an acceleration of the air flow and to increase this air flow.
  • the flow of air at the outlet is perpendicular to the flow of air in the circulation chamber, which imposes a significant power of the circulation system and high speed operation of the motorization equipping said circulation system, so that the Coanda effect can be effective.
  • This design therefore generates significant energy consumption and noise pollution, problems frequently encountered with prior hair dryers, whatever their designs.
  • the present invention overcomes these drawbacks of prior hair dryers, and aims in particular to optimize the implementation of a Coanda effect in the air outlet zone.
  • the invention relates to a hair dryer which comprises an air circulation chamber provided with an inlet zone and an outlet zone.
  • the hair dryer also includes an air circulation system and a heating element which are arranged in the circulation chamber.
  • the circulation system is configured to draw air from the outside, through the inlet zone, then to convey this air into the circulation chamber, from upstream to downstream, passing through the heating element, and finally to blow the more or less heated air to the outside, through the outlet zone.
  • the hair dryer comprises, as is known, means for adjusting the temperature of the heating element to modify the temperature of the air blown out at the outlet and means for adjusting the speed of air circulation in the chamber.
  • circulation chamber in particular by acting on the speed of rotation of a motor driving a propeller.
  • the hair dryer comprises a duct arranged in the extension of the circulation chamber at the level of the exit zone.
  • the circulation chamber and the duct are arranged along the same longitudinal axis.
  • the duct has an upstream end, a downstream end and a neck arranged between said upstream and downstream ends. More precisely, the neck corresponds to the internal contour of the duct where the cross section is minimal.
  • the first portion of the duct, arranged between the upstream end and the neck has an angle of descent with respect to the longitudinal axis of the circulation chamber, of between 40 ° and 88 °. The first portion thus exhibits a continuous narrowing of the cross section of the duct from the upstream end to the neck.
  • the descent angle corresponds to the maximum angle adopted by the first portion of the duct with respect to the longitudinal axis.
  • the second portion of the duct arranged between the neck and the downstream end, has a reopening angle with respect to said longitudinal axis, between 1.5 ° and 3.5 °.
  • the second portion thus presents a continuous widening of the cross section of the duct from the neck to the downstream end.
  • the change from narrowing to widening of the cross section of the duct produces a Coanda effect at the neck.
  • the neck, connecting said first and second portions of the duct is of curved shape, preferably of circular shape, configured to promote the creation of this Coanda effect.
  • the Coanda effect produced at the neck generates an acceleration of the air leaving the duct.
  • the reopening angle allows an increase in the section of the duct in the second portion located between the downstream end and the neck, which generates an increase in the air flow at the outlet of the duct.
  • the descent angle is 82 °.
  • the reopening angle is preferably 2.5 °.
  • the duct has a circular cross section.
  • the neck has a reduction in diameter relative to the downstream end which is between 2 mm and 4 mm.
  • this reduction in diameter is 2 mm.
  • the heating element is spaced from the neck of the duct by a distance of between 0 mm and 5 mm.
  • the heating element enters the zone of convergence of the neck of the duct, corresponding to a zero distance, the Coanda effect is greatly reduced.
  • said distance is 4 mm, which allows optimization of the Coanda effect.
  • a grid is arranged between the heating element and the duct.
  • the presence of such a grid is intended to prevent any direct contact of the heating element with the fingers, by introducing them through the duct.
  • removable connection means are arranged between the circulation chamber and the duct so as to allow the removal of said duct, for example to replace the duct of circular cross section with another similar one. of different dimensions or by another of rectangular or triangular cross section.
  • the hair dryer 1 comprises a body 2 which has a more or less cylindrical shape making it possible to constitute a circulation chamber 3, which has a longitudinal axis X.
  • This circulation chamber 3 comprises an inlet zone 4 and a flow zone. outlet 5.
  • a circulation system 6 is arranged in this circulation chamber 3, which makes it possible to suck the ambient air through the inlet zone, then to convey this air over the entire length of the circulation chamber 3 so as to then blow the air outside the hair dryer 1, through the outlet zone 5.
  • This circulation system 6 comprises a propeller 7 arranged near the inlet zone 4, a motor 8 making it possible to drive the propeller 7 in rotation, and a rectifier 9 arranged downstream of the propeller 7 and making it possible to channel the air at the outlet of this propeller 7.
  • the hair dryer 1 also comprises a heating element 10 arranged in downstream of the rectifier 9, which makes it possible to heat the air in the e downstream of the circulation chamber 3, before its expulsion through the outlet zone 5.
  • the hair dryer 1 also comprises means for controlling and adjusting the motor 8 and the heating element 10 (not shown) which make it possible to individually modify the speed of rotation of the motor 8 and the heating temperature of the heating element 10, from an off position to a full power position. All these characteristics are generally found on hair dryers, so they are not detailed in the rest of the description.
  • the invention relates in particular to a duct 11, illustrated on figures 1 to 3 .
  • the duct 11 is arranged in the extension of the outlet zone 5 of the circulation chamber 3, along the longitudinal axis X, as illustrated in figures 1 and 2 .
  • the duct 11 is preferably circular in shape, and comprises an upstream end 12 and a downstream end 13.
  • the section of the upstream end 12 of the duct 11 corresponds to the section of the outlet zone 5 of the circulation chamber 3.
  • the duct 11 has a shape of revolution with a neck 14 which defines on said duct 11 an upstream portion 15 and a downstream portion 16, illustrated in figure 3 .
  • the configuration of the duct 11, as shown in the figures 1 to 3 makes it possible to subject the air leaving the circulation chamber 3, to a Coanda effect, a phenomenon of fluid mechanics known per se.
  • the air leaving the circulation chamber 3, at the level of the outlet zone 5, is subjected to a reduction in passage section due to the presence of the neck 14, which forces the air to flow at an angle corresponding to a descent angle ⁇ of the upstream portion 15, illustrated in figure 3 .
  • the outgoing air is therefore compressed up to the passage section of the neck 14. Once the neck has been passed, this outgoing air expands following the increase in the passage section to the downstream end 13 of the duct 11.
  • the outgoing air expands and then flows at an angle corresponding to an angle of reopening ⁇ of the downstream portion 16, illustrated in figure 3 .
  • the descent angle ⁇ and the reopening angle ⁇ are defined with respect to the longitudinal axis X on the figure 3 .
  • This geometry of the duct 11 makes it possible to generate a suction of the air leaving towards the downstream end 13, which increases the speed of the air at the outlet.
  • this geometry of the duct 11 makes it possible to jointly increase the air flow rate at the outlet.
  • the dimensions of the duct 11 are variable and partly adapted to those of the circulation chamber 3, the passage section of the upstream end 12 of said duct 11 corresponding to the passage section of the outlet zone 5 of said circulation chamber 3, and the angles of descent ⁇ and of reopening ⁇ of the duct 11 being chosen from the aforementioned value ranges.
  • the Applicant has observed that it is possible to further improve the speed of the air leaving the duct while maintaining an excellent flow rate, by reducing the diameter D1 at the level of the neck 14 relative to the diameter D2 at the level of the downstream end 13, with a value between 2 mm and 4 mm, preferably 2 mm.
  • the diameter D2 at the level of the downstream end 13 of the duct is chosen between 30 mm and 40 mm, and is preferably equal to 32 mm, which also helps to blow the air out at an optimized speed, while maintaining an excellent flow.
  • the downstream end 17 of the heating element 10 is spaced from the neck 14 of the duct 11 by a distance d which is between 0 mm and 5 mm, which influences the desired Coanda effect.
  • this distance d is 4 mm to optimize this Coanda effect.
  • the hair dryer 1 comprises a grid 18 which is arranged downstream of the heating element 10 in the circulation chamber 3. This grid 18 prevents any contact with the heating element 10.
  • the duct 11 is circular in shape. However, it is possible to envisage a section of square, rectangular or triangular shape for the duct 11, or even another, while retaining a descent angle ⁇ and a reopening angle ⁇ as provided for the embodiment of the figures 1 to 3 .
  • the duct 11 remains permanently attached to the circulation chamber 3.
  • removable connection means can be provided between the downstream end 19 of the circulation chamber 3 and the upstream end 12 of the duct 11, for example an interlocking or a snap-fit system between said downstream 19 and upstream 12 ends, so as to allow the duct 11 to be dismantled for its replacement by another of a different configuration remaining under the cover of the invention.

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  • Cleaning And Drying Hair (AREA)

Description

Domaine techniqueTechnical area

La présente invention se rapporte au domaine des sèche-cheveux et vise à fournir des performances de séchage et de ressenti importantes, tout en réduisant le bruit de l'appareil.The present invention relates to the field of hair dryers and aims to provide significant drying and feeling performance, while reducing the noise of the appliance.

Etat de la techniqueState of the art

Traditionnellement, les sèche-cheveux comprennent une zone d'entrée d'air, une chambre de circulation d'air, une zone de sortie d'air, un système de circulation d'air et un élément chauffant. Le système de circulation d'air et l'élément chauffant sont intégrés dans la chambre de circulation. Le système de circulation d'air aspire l'air de l'extérieur au travers de la zone d'entrée puis véhicule cet air dans la chambre de circulation, de l'amont vers l'aval, en passant par l'élément chauffant, l'air plus ou moins chauffé étant ensuite soufflé à l'extérieur au travers de la zone de sortie, de sorte à sécher les cheveux.Traditionally, hair dryers have included an air inlet area, an air circulation chamber, an air outlet area, an air circulation system, and a heating element. The air circulation system and the heating element are integrated in the circulation chamber. The air circulation system draws the air from outside through the inlet zone then conveys this air into the circulation chamber, from upstream to downstream, passing through the heating element, the more or less heated air then being blown outside through the exit zone, so as to dry the hair.

Il est connu la demande de brevet US 2013/0111777 A1 qui décrit un sèche-cheveux configuré pour amplifier le débit de l'air en sortie. Pour cela, le sèche-cheveux comprend une tête de sortie configurée pour créer un effet Coanda produisant une accélération du flux d'air et pour augmenter ce flux d'air. Selon cette conception, l'écoulement de l'air en sortie est perpendiculaire à l'écoulement de l'air dans la chambre de circulation, ce qui impose une puissance importante du système de circulation et un fonctionnement à vitesse élevée de la motorisation équipant ledit système de circulation, pour que l'effet Coanda puisse être efficace. Cette conception engendre donc une consommation importante d'énergie et des nuisances sonores, problèmes rencontrés fréquemment avec les sèche-cheveux antérieurs, quelles que soient leurs conceptions.It is known the patent application US 2013/0111777 A1 which describes a hair dryer configured to amplify the output air flow. For this, the hair dryer includes an outlet head configured to create a Coanda effect producing an acceleration of the air flow and to increase this air flow. According to this design, the flow of air at the outlet is perpendicular to the flow of air in the circulation chamber, which imposes a significant power of the circulation system and high speed operation of the motorization equipping said circulation system, so that the Coanda effect can be effective. This design therefore generates significant energy consumption and noise pollution, problems frequently encountered with prior hair dryers, whatever their designs.

On connait également le brevet JP 4 671302 qui propose un nez de sèche cheveu particulier.We also know the patent JP 4,671,302 which offers a particular dry hair nose.

Résumé de l'inventionSummary of the invention

La présente invention pallie ces inconvénients des sèche-cheveux antérieurs, et vise en particulier à optimiser la mise en œuvre d'un effet Coanda dans la zone de sortie d'air.The present invention overcomes these drawbacks of prior hair dryers, and aims in particular to optimize the implementation of a Coanda effect in the air outlet zone.

A cet effet, l'invention concerne un sèche-cheveux qui comprend une chambre de circulation d'air munie d'une zone d'entrée et d'une zone de sortie. Le sèche-cheveux comprend également un système de circulation d'air et un élément chauffant qui sont agencés dans la chambre de circulation. Le système de circulation est configuré pour aspirer l'air depuis l'extérieur, au travers de la zone d'entrée, puis pour véhiculer cet air dans la chambre de circulation, de l'amont vers l'aval, en passant par l'élément chauffant, et enfin pour souffler l'air plus ou moins chauffé à l'extérieur, au travers de la zone de sortie. Le sèche-cheveux comprend, comme cela est connu, des moyens de réglage de la température de l'élément chauffant pour modifier la température de l'air soufflé en sortie et de moyens de réglage de la vitesse de circulation de l'air dans la chambre de circulation, en agissant notamment sur la vitesse de rotation d'un moteur entraînant une hélice.To this end, the invention relates to a hair dryer which comprises an air circulation chamber provided with an inlet zone and an outlet zone. The hair dryer also includes an air circulation system and a heating element which are arranged in the circulation chamber. The circulation system is configured to draw air from the outside, through the inlet zone, then to convey this air into the circulation chamber, from upstream to downstream, passing through the heating element, and finally to blow the more or less heated air to the outside, through the outlet zone. The hair dryer comprises, as is known, means for adjusting the temperature of the heating element to modify the temperature of the air blown out at the outlet and means for adjusting the speed of air circulation in the chamber. circulation chamber, in particular by acting on the speed of rotation of a motor driving a propeller.

De manière remarquable, le sèche-cheveux comprend un conduit agencé dans le prolongement de la chambre de circulation au niveau de la zone de sortie. Ainsi, la chambre de circulation et le conduit sont disposés selon un même axe longitudinal. En outre, le conduit présente une extrémité amont, une extrémité aval et un col agencé entre lesdites extrémités amont et aval. Plus précisément, le col correspond au contour intérieur du conduit où la section transversale est minimale. La première portion du conduit, agencée entre l'extrémité amont et le col, présente un angle de descente par rapport à l'axe longitudinal de la chambre de circulation, compris entre 40° et 88°. La première portion présente ainsi un rétrécissement continu de la section transversale du conduit depuis l'extrémité amont jusqu'au col. L'angle de descente correspond à l'angle maximal adopté par la première portion du conduit par rapport à l'axe longitudinal. La seconde portion du conduit, agencée entre le col et l'extrémité aval, présente un angle de réouverture par rapport audit axe longitudinal, compris entre 1,5° et 3,5°. La deuxième portion présente ainsi un élargissement continu de la section transversale du conduit depuis le col jusqu'à l'extrémité aval. Le passage d'un rétrécissement à un élargissement de la section transversale du conduit produit un effet Coanda au niveau du col. Le col, reliant lesdites première et seconde portions du conduit, est de forme incurvée, de préférence de forme circulaire, configurée pour favoriser la création de cet effet Coanda.Remarkably, the hair dryer comprises a duct arranged in the extension of the circulation chamber at the level of the exit zone. Thus, the circulation chamber and the duct are arranged along the same longitudinal axis. In addition, the duct has an upstream end, a downstream end and a neck arranged between said upstream and downstream ends. More precisely, the neck corresponds to the internal contour of the duct where the cross section is minimal. The first portion of the duct, arranged between the upstream end and the neck, has an angle of descent with respect to the longitudinal axis of the circulation chamber, of between 40 ° and 88 °. The first portion thus exhibits a continuous narrowing of the cross section of the duct from the upstream end to the neck. The descent angle corresponds to the maximum angle adopted by the first portion of the duct with respect to the longitudinal axis. The second portion of the duct, arranged between the neck and the downstream end, has a reopening angle with respect to said longitudinal axis, between 1.5 ° and 3.5 °. The second portion thus presents a continuous widening of the cross section of the duct from the neck to the downstream end. The change from narrowing to widening of the cross section of the duct produces a Coanda effect at the neck. The neck, connecting said first and second portions of the duct, is of curved shape, preferably of circular shape, configured to promote the creation of this Coanda effect.

L'effet Coanda produit au niveau du col engendre une accélération de l'air en sortie du conduit. En outre, l'angle de réouverture permet une augmentation de la section du conduit dans la seconde portion située entre l'extrémité aval et le col, ce qui engendre une augmentation du débit d'air en sortie du conduit. La demanderesse a constaté qu'en mettant en œuvre les paramètres géométriques précités du conduit, c'est-à-dire en choisissant un angle de descente et un angle de réouverture dans les plages de valeurs précitées, le conduit permet de produire une accélération de l'air et une augmentation du débit d'air en sortie de manière optimale. Il est donc possible de réduire la puissance et le dimensionnement du système de circulation d'air dont la motorisation peut fonctionner à plus faible régime que celles des sèche-cheveux antérieurs, tout en parvenant à des performances de séchage et de ressenti sur les cheveux, équivalentes voire améliorées. Cela permet avantageusement d'améliorer les performances acoustiques du sèche-cheveux.The Coanda effect produced at the neck generates an acceleration of the air leaving the duct. In addition, the reopening angle allows an increase in the section of the duct in the second portion located between the downstream end and the neck, which generates an increase in the air flow at the outlet of the duct. The Applicant has observed that by implementing the aforementioned geometric parameters of the duct, that is to say by choosing an angle of descent and an angle of reopening within the above-mentioned ranges of values, the duct makes it possible to produce an acceleration of air and an increase in the output air flow optimally. It is therefore possible to reduce the power and sizing of the air circulation system, the motor of which can operate at lower speed than those of previous hair dryers, while achieving drying performance and feeling on the hair, equivalent or even improved. This advantageously makes it possible to improve the acoustic performance of the hair dryer.

Dans une réalisation préférentielle du sèche-cheveux selon l'invention, l'angle de descente est de 82°. De même, l'angle de réouverture est de préférence de 2,5°. Le choix de l'un et/ou l'autre des paramètres précités permet d'optimiser le résultat.In a preferred embodiment of the hair dryer according to the invention, the descent angle is 82 °. Likewise, the reopening angle is preferably 2.5 °. The choice of one and / or the other of the aforementioned parameters makes it possible to optimize the result.

Dans une réalisation préférentielle du sèche-cheveux selon l'invention, le conduit présente une section transversale de forme circulaire. On peut toutefois envisager un conduit présentant une section transversale de forme rectangulaire ou triangulaire, voire autres, sans sortir du cadre de l'invention.In a preferred embodiment of the hair dryer according to the invention, the duct has a circular cross section. However, it is possible to envisage a duct having a cross section of rectangular or triangular shape, or even others, without departing from the scope of the invention.

Selon cette réalisation préférentielle du sèche-cheveux où le conduit présente une section transversale de forme circulaire, le col présente une réduction de diamètre par rapport à l'extrémité aval qui est comprise entre 2 mm et 4 mm. De préférence, cette réduction de diamètre est de 2 mm.According to this preferred embodiment of the hair dryer where the duct has a cross section of circular shape, the neck has a reduction in diameter relative to the downstream end which is between 2 mm and 4 mm. Preferably, this reduction in diameter is 2 mm.

Dans une réalisation du sèche-cheveux selon l'invention, l'élément chauffant est écarté du col du conduit d'une distance comprise entre 0 mm et 5 mm. Lorsque l'élément chauffant rentre dans la zone de convergence du col du conduit, correspondant à une distance nulle, l'effet Coanda est fortement réduit. Au contraire, lorsque la distance est au-delà de 5 mm, plus aucune différence sur l'effet Coanda n'est remarquée. Dans une réalisation préférentielle, ladite distance est de 4 mm, ce qui permet une optimisation de l'effet Coanda.In one embodiment of the hair dryer according to the invention, the heating element is spaced from the neck of the duct by a distance of between 0 mm and 5 mm. When the heating element enters the zone of convergence of the neck of the duct, corresponding to a zero distance, the Coanda effect is greatly reduced. On the contrary, when the distance is beyond 5 mm, no more difference in the Coanda effect is noticed. In a preferred embodiment, said distance is 4 mm, which allows optimization of the Coanda effect.

Dans une réalisation du sèche-cheveux selon l'invention, une grille est agencée entre l'élément chauffant et le conduit. La présence d'une telle grille a pour objectif d'empêcher tout contact direct de l'élément chauffant avec les doigts, en les introduisant par le conduit.In one embodiment of the hair dryer according to the invention, a grid is arranged between the heating element and the duct. The presence of such a grid is intended to prevent any direct contact of the heating element with the fingers, by introducing them through the duct.

Dans une réalisation du sèche-cheveux selon l'invention, des moyens de connexion amovibles sont agencés entre la chambre de circulation et le conduit de sorte à permettre le retrait dudit conduit, par exemple pour remplacer le conduit de section transversale circulaire par un autre similaire de dimensions différentes ou par un autre de section transversale rectangulaire ou triangulaire.In one embodiment of the hair dryer according to the invention, removable connection means are arranged between the circulation chamber and the duct so as to allow the removal of said duct, for example to replace the duct of circular cross section with another similar one. of different dimensions or by another of rectangular or triangular cross section.

Brève description des figuresBrief description of the figures

La description suivante d'un mode de réalisation préférentielle permet de mettre en lumière l'objet de l'invention, à l'appui de figures, parmi lesquelles :

  • La figure 1 illustre une vue en coupe d'un sèche-cheveux selon l'invention ;
  • La figure 2 illustre une vue en coupe agrandie de la partie aval du sèche-cheveux illustré en figure 1 ;
  • La figure 3 illustre une vue en coupe du conduit seul.
The following description of a preferred embodiment makes it possible to highlight the subject of the invention, with the support of figures, among which:
  • The figure 1 illustrates a sectional view of a hair dryer according to the invention;
  • The figure 2 illustrates an enlarged sectional view of the downstream part of the hair dryer illustrated in figure 1 ;
  • The figure 3 illustrates a sectional view of the duct alone.

Description détailléedetailed description

Tel qu'illustré sur la figure 1, le sèche-cheveux 1 comprend un corps 2 qui présente une forme plus ou moins cylindrique permettant de constituer une chambre de circulation 3, laquelle présente un axe longitudinal X. Cette chambre de circulation 3 comprend une zone d'entrée 4 et une zone de sortie 5. Un système de circulation 6 est agencé dans cette chambre de circulation 3, lequel permet d'aspirer l'air ambiant au travers de la zone d'entrée, puis de véhiculer cet air sur toute la longueur de la chambre de circulation 3 de sorte à souffler ensuite l'air à l'extérieur du sèche-cheveux 1, au travers de la zone de sortie 5. Ce système de circulation 6 comprend une hélice 7 agencée à proximité de la zone d'entrée 4, un moteur 8 permettant d'entraîner en rotation l'hélice 7, et un redresseur 9 agencé en aval de l'hélice 7 et permettant de canaliser l'air en sortie de cette hélice 7. Le sèche-cheveux 1 comprend également un élément chauffant 10 agencé en aval du redresseur 9, lequel permet de chauffer l'air dans la partie aval de la chambre de circulation 3, avant son expulsion au travers de la zone de sortie 5. Le sèche-cheveux 1 comprend également des moyens de commande et de réglage du moteur 8 et de l'élément chauffant 10 (non illustrés) qui permettent de modifier individuellement la vitesse de rotation du moteur 8 et la température de chauffe de l'élément chauffant 10, d'une position éteinte à une position pleine puissance. Toutes ces caractéristiques se retrouvent généralement sur les sèche-cheveux, elles ne sont donc pas détaillées dans la suite de la description.As shown on figure 1 , the hair dryer 1 comprises a body 2 which has a more or less cylindrical shape making it possible to constitute a circulation chamber 3, which has a longitudinal axis X. This circulation chamber 3 comprises an inlet zone 4 and a flow zone. outlet 5. A circulation system 6 is arranged in this circulation chamber 3, which makes it possible to suck the ambient air through the inlet zone, then to convey this air over the entire length of the circulation chamber 3 so as to then blow the air outside the hair dryer 1, through the outlet zone 5. This circulation system 6 comprises a propeller 7 arranged near the inlet zone 4, a motor 8 making it possible to drive the propeller 7 in rotation, and a rectifier 9 arranged downstream of the propeller 7 and making it possible to channel the air at the outlet of this propeller 7. The hair dryer 1 also comprises a heating element 10 arranged in downstream of the rectifier 9, which makes it possible to heat the air in the e downstream of the circulation chamber 3, before its expulsion through the outlet zone 5. The hair dryer 1 also comprises means for controlling and adjusting the motor 8 and the heating element 10 (not shown) which make it possible to individually modify the speed of rotation of the motor 8 and the heating temperature of the heating element 10, from an off position to a full power position. All these characteristics are generally found on hair dryers, so they are not detailed in the rest of the description.

L'invention porte en particulier sur un conduit 11, illustré sur les figures 1 à 3. Le conduit 11 est agencé dans le prolongement de la zone de sortie 5 de la chambre de circulation 3, selon l'axe longitudinal X, comme illustré en figures 1 et 2. Le conduit 11 est préférentiellement de forme circulaire, et comprend une extrémité amont 12 et une extrémité aval 13. La section de l'extrémité amont 12 du conduit 11 correspond à la section de la zone de sortie 5 de la chambre de circulation 3. En outre, le conduit 11 présente une forme de révolution avec un col 14 qui définit sur ledit conduit 11 une portion amont 15 et une portion aval 16, illustrées en figure 3. La configuration du conduit 11, telle qu'illustrée sur les figures 1 à 3, permet de soumettre l'air sortant de la chambre de circulation 3, à un effet Coanda, phénomène de la mécanique des fluides connu en soi. L'air sortant de la chambre de circulation 3, au niveau de la zone de sortie 5, est soumis à une réduction de section de passage du fait de la présence du col 14, ce qui contraint l'air à s'écouler suivant un angle correspondant à un angle de descente α de la portion amont 15, illustré en figure 3. L'air sortant est donc compressé jusqu'à la section de passage du col 14. Une fois le col passé, cet air sortant se détend en suivant l'augmentation de section de passage jusqu'à l'extrémité aval 13 du conduit 11. L'air sortant se détend et s'écoule alors selon un angle correspondant à un angle de réouverture β de la portion aval 16, illustré en figure 3. L'angle de descente α et l'angle de réouverture β sont définis par rapport à l'axe longitudinal X sur la figure 3. Cette géométrie du conduit 11 permet de générer une aspiration de l'air sortant vers l'extrémité aval 13, ce qui augmente la vitesse de l'air en sortie. En outre, cette géométrie du conduit 11 permet d'augmenter conjointement le débit d'air en sortie.The invention relates in particular to a duct 11, illustrated on figures 1 to 3 . The duct 11 is arranged in the extension of the outlet zone 5 of the circulation chamber 3, along the longitudinal axis X, as illustrated in figures 1 and 2 . The duct 11 is preferably circular in shape, and comprises an upstream end 12 and a downstream end 13. The section of the upstream end 12 of the duct 11 corresponds to the section of the outlet zone 5 of the circulation chamber 3. In furthermore, the duct 11 has a shape of revolution with a neck 14 which defines on said duct 11 an upstream portion 15 and a downstream portion 16, illustrated in figure 3 . The configuration of the duct 11, as shown in the figures 1 to 3 , makes it possible to subject the air leaving the circulation chamber 3, to a Coanda effect, a phenomenon of fluid mechanics known per se. The air leaving the circulation chamber 3, at the level of the outlet zone 5, is subjected to a reduction in passage section due to the presence of the neck 14, which forces the air to flow at an angle corresponding to a descent angle α of the upstream portion 15, illustrated in figure 3 . The outgoing air is therefore compressed up to the passage section of the neck 14. Once the neck has been passed, this outgoing air expands following the increase in the passage section to the downstream end 13 of the duct 11. The outgoing air expands and then flows at an angle corresponding to an angle of reopening β of the downstream portion 16, illustrated in figure 3 . The descent angle α and the reopening angle β are defined with respect to the longitudinal axis X on the figure 3 . This geometry of the duct 11 makes it possible to generate a suction of the air leaving towards the downstream end 13, which increases the speed of the air at the outlet. In addition, this geometry of the duct 11 makes it possible to jointly increase the air flow rate at the outlet.

Les recherches menées par la demanderesse ont permis de montrer l'importance de choisir un angle de descente α de la portion amont 15 et un angle de réouverture β de la portion aval 16, adaptés de sorte à augmenter la vitesse et le débit de l'air en sortie du conduit 11. La demanderesse a constaté qu'un angle de descente α compris entre 40° et 88°, de préférence égal à 82°, et qu'un angle de réouverture β compris entre 1,5° et 3,5°, de préférence égal à 2,5°, permettent d'optimiser cette augmentation de vitesse et de débit de l'air en sortie du conduit 11.The research carried out by the Applicant has shown the importance of choosing an angle of descent α of the upstream portion 15 and an angle of reopening β of the downstream portion 16, adapted so as to increase the speed and the flow of the air at the outlet of duct 11. The applicant has observed that an angle of descent α of between 40 ° and 88 °, preferably equal to 82 °, and that an angle of reopening β of between 1.5 ° and 3, 5 °, preferably equal to 2.5 °, make it possible to optimize this increase in speed and flow rate of the air leaving the duct 11.

Les dimensions du conduit 11 sont variables et adaptées en partie à celles de la chambre de circulation 3, la section de passage de l'extrémité amont 12 dudit conduit 11 correspondant à la section de passage de la zone de sortie 5 de ladite chambre de circulation 3, et les angles de descentes α et de réouverture β du conduit 11 étant choisis dans les plages de valeur précitées. La demanderesse a constaté qu'il est possible d'améliorer encore la vitesse de l'air en sortie du conduit tout en conservant un excellent débit, en réduisant le diamètre D1 au niveau du col 14 par rapport au diamètre D2 au niveau de l'extrémité aval 13, d'une valeur comprise entre 2 mm et 4 mm, de préférence 2 mm. De préférence, le diamètre D2 au niveau de l'extrémité aval 13 du conduit est choisi entre 30 mm et 40 mm, et est de préférence égal à 32 mm, ce qui contribue également à souffler l'air en sortie avec une vitesse optimisée, tout en conservant un excellent débit.The dimensions of the duct 11 are variable and partly adapted to those of the circulation chamber 3, the passage section of the upstream end 12 of said duct 11 corresponding to the passage section of the outlet zone 5 of said circulation chamber 3, and the angles of descent α and of reopening β of the duct 11 being chosen from the aforementioned value ranges. The Applicant has observed that it is possible to further improve the speed of the air leaving the duct while maintaining an excellent flow rate, by reducing the diameter D1 at the level of the neck 14 relative to the diameter D2 at the level of the downstream end 13, with a value between 2 mm and 4 mm, preferably 2 mm. Preferably, the diameter D2 at the level of the downstream end 13 of the duct is chosen between 30 mm and 40 mm, and is preferably equal to 32 mm, which also helps to blow the air out at an optimized speed, while maintaining an excellent flow.

Tel qu'illustré notamment sur la figure 2, l'extrémité aval 17 de l'élément chauffant 10 est espacée du col 14 du conduit 11 d'une distance d qui est comprise entre 0 mm et 5 mm, ce qui influe sur l'effet Coanda recherché. De préférence, cette distance d est de 4 mm pour optimiser cet effet Coanda.As illustrated in particular on the figure 2 , the downstream end 17 of the heating element 10 is spaced from the neck 14 of the duct 11 by a distance d which is between 0 mm and 5 mm, which influences the desired Coanda effect. Preferably, this distance d is 4 mm to optimize this Coanda effect.

Tel qu'illustré sur les figures 1 et 2, le sèche-cheveux 1 comprend une grille 18 qui est agencée en aval de l'élément chauffant 10 dans la chambre de circulation 3. Cette grille 18 évite tout contact avec l'élément chauffant 10.As shown on figures 1 and 2 , the hair dryer 1 comprises a grid 18 which is arranged downstream of the heating element 10 in the circulation chamber 3. This grid 18 prevents any contact with the heating element 10.

D'autres caractéristiques ou variantes sont envisageables sans sortir du cadre de l'invention.Other characteristics or variants are conceivable without departing from the scope of the invention.

Sur les figures 1 à 3, le conduit 11 est de forme circulaire. On peut toutefois envisager une section de forme carrée, rectangulaire ou triangulaire pour le conduit 11, voire autre, tout en conservant un angle de descente α et un angle de réouverture β tels que prévus pour le mode de réalisation des figures 1 à 3.On the figures 1 to 3 , the duct 11 is circular in shape. However, it is possible to envisage a section of square, rectangular or triangular shape for the duct 11, or even another, while retaining a descent angle α and a reopening angle β as provided for the embodiment of the figures 1 to 3 .

Sur ces figures 1 à 3, le conduit 11 reste fixé en permanence à la chambre de circulation 3. On peut toutefois prévoir des moyens de connexion amovibles entre l'extrémité aval 19 de la chambre de circulation 3 et l'extrémité amont 12 du conduit 11, par exemple un emboîtement ou un système d'encliquetage entre lesdites extrémités aval 19 et amont 12, de sorte à permettre le démontage du conduit 11 pour son remplacement par un autre de configuration différente restant sous le couvert de l'invention.On these figures 1 to 3 , the duct 11 remains permanently attached to the circulation chamber 3. However, removable connection means can be provided between the downstream end 19 of the circulation chamber 3 and the upstream end 12 of the duct 11, for example an interlocking or a snap-fit system between said downstream 19 and upstream 12 ends, so as to allow the duct 11 to be dismantled for its replacement by another of a different configuration remaining under the cover of the invention.

Claims (12)

  1. Hair dryer (1) comprising an air circulation chamber (3) provided with an inlet area (4) and an outlet area (5), an air circulation system (6) and a heating element (10), the air circulation system and the heating element being configured in the circulation chamber to suction air from the outside through the inlet area, conveying this air into the circulation chamber, upstream to downstream, by passing through the heating element, and to blow the more or less heated air outwards through the outlet area, the hair dryer comprising a channel (11) arranged within the extension of the circulation chamber at the level of the outlet area, said channel having an upstream end (12), a downstream end (13) and a neck (14) arranged between said upstream and downstream ends, the first portion (15) of the channel arranged between the upstream end and the neck having a downward angle (α) relative to a longitudinal axis (X) of the circulation chamber, comprised between 40° and 88°, and the second portion (16) of the channel arranged between the neck and the downstream end having an angle of reopening (β) relative to said longitudinal axis, comprised between 1.5° and 3.5°, the neck (14), connecting said first and second portions of the channel, being of curved shape configured to favour the creation of a Coanda effect.
  2. Hair dryer (1) according to claim 1, wherein the downward angle (α) is 82°.
  3. Hair dryer (1) according to one of claims 1 or 2, wherein the angle of reopening (β) is 2.5°.
  4. Hair dryer (1) according to one of claims 1 to 3, wherein the channel (11) has a circular-shaped transversal cross-section.
  5. Hair dryer (1) according to claim 4, wherein the neck (14) has a diameter reduction relative to the downstream end comprised between 2mm and 4mm.
  6. Hair dryer (1) according to claim 5, wherein said diameter reduction is 2mm.
  7. Hair dryer (1) according to one of claims 1 to 3, wherein the channel (11) has a rectangular-shaped transversal cross-section.
  8. Hair dryer (1) according to one of claims 1 to 3, wherein the channel (11) has a triangular-shaped transversal cross-section.
  9. Hair dryer (1) according to one of claims 1 to 8, wherein the heating element (10) is deviated from the neck (14) of the channel (11) by a distance (d) comprised between 0mm and 5mm.
  10. Hair dryer (1) according to claim 9, wherein said distance (d) is 4mm.
  11. Hair dryer (1) according to one of claims 1 to 10, wherein a grille (18) is arranged between the heating element (10) and the channel (11).
  12. Hair dryer (1) according to one of claims 1 to 11, wherein removable connection means are arranged between the circulation chamber (3) and the channel (11) so as to allow the removal of said channel.
EP16744816.6A 2015-07-28 2016-07-08 Hair dryer having coanda effect air outlet Active EP3328237B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1557226A FR3039377B1 (en) 2015-07-28 2015-07-28 HAIR DRYER WITH COANDA EFFECT AIR OUTPUT DUCT
PCT/FR2016/051761 WO2017017330A1 (en) 2015-07-28 2016-07-08 Hair dryer having coanda effect air outlet

Publications (2)

Publication Number Publication Date
EP3328237A1 EP3328237A1 (en) 2018-06-06
EP3328237B1 true EP3328237B1 (en) 2020-11-18

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EP16744816.6A Active EP3328237B1 (en) 2015-07-28 2016-07-08 Hair dryer having coanda effect air outlet

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EP (1) EP3328237B1 (en)
KR (1) KR102585672B1 (en)
CN (1) CN107847031B (en)
BR (1) BR112018001555B1 (en)
ES (1) ES2837131T3 (en)
FR (1) FR3039377B1 (en)
RU (1) RU2712366C1 (en)
WO (1) WO2017017330A1 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
US11653737B1 (en) 2021-11-12 2023-05-23 Sharkninja Operating Llc Hair care appliance
USD1021238S1 (en) 2022-06-02 2024-04-02 Sharkninja Operating Llc Hair care appliance
USD1028523S1 (en) 2023-12-26 2024-05-28 Sharkninja Operating Llc Hair care accessory

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FR3111527B1 (en) 2020-06-19 2022-07-29 Seb Sa Hair dryer comprising a shock-absorbing support
FR3111676B1 (en) 2020-06-19 2022-12-16 Seb Sa Propeller for a blower comprising radial air passage channels
FR3111526B1 (en) 2020-06-19 2022-06-24 Seb Sa Hair dryer comprising external and internal boxes separated by annular insulation devices.

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DE60319496T2 (en) * 2002-12-27 2009-03-26 Matsushita Electric Works, Ltd., Kadoma Hair dryer with a minus ion generator
JP4671302B2 (en) * 2007-09-13 2011-04-13 九州日立マクセル株式会社 Hair dryer with converging nozzle
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FR2982747B1 (en) * 2011-11-18 2014-01-10 Seb Sa HAIRDRYER WITH CONCENTRIC FINES
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11653737B1 (en) 2021-11-12 2023-05-23 Sharkninja Operating Llc Hair care appliance
US11832700B2 (en) 2021-11-12 2023-12-05 Sharkninja Operating Llc Hair care appliance
USD1021238S1 (en) 2022-06-02 2024-04-02 Sharkninja Operating Llc Hair care appliance
USD1028352S1 (en) 2022-06-02 2024-05-21 Sharkninja Operating Llc Hair dryer concentrator
USD1028523S1 (en) 2023-12-26 2024-05-28 Sharkninja Operating Llc Hair care accessory

Also Published As

Publication number Publication date
WO2017017330A1 (en) 2017-02-02
BR112018001555A2 (en) 2018-09-18
FR3039377B1 (en) 2017-09-01
CN107847031B (en) 2020-11-20
EP3328237A1 (en) 2018-06-06
CN107847031A (en) 2018-03-27
KR102585672B1 (en) 2023-10-06
BR112018001555B1 (en) 2022-07-05
FR3039377A1 (en) 2017-02-03
RU2712366C1 (en) 2020-01-28
ES2837131T3 (en) 2021-06-29
KR20180034531A (en) 2018-04-04

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