EP2512282B1 - Hairdryer having a passive silencer system - Google Patents

Hairdryer having a passive silencer system Download PDF

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Publication number
EP2512282B1
EP2512282B1 EP10809289.1A EP10809289A EP2512282B1 EP 2512282 B1 EP2512282 B1 EP 2512282B1 EP 10809289 A EP10809289 A EP 10809289A EP 2512282 B1 EP2512282 B1 EP 2512282B1
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EP
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Prior art keywords
air
fuselage
hair dryer
internal
fan
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EP10809289.1A
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German (de)
French (fr)
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EP2512282A2 (en
Inventor
Christian Carme
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Technofirst SA
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Technofirst 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
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/42—Additional devices or measures, e.g. for noise damping, for musical entertainment
    • 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 general field of hair dryers.
  • a hair dryer typically includes a tapered plastic shell between a rear end and a front end through which the air set in motion and heated within the hair dryer.
  • the plastic shell thus defines at least one air inlet and one air outlet and is intended to accommodate at least one motor and one fan.
  • the axis of the fan is carried by an internal structure fixed in the central part of the fuselage. It is known that the operation of a hair dryer generates several types of noise among which the noise related to the flow of air flow and noise related to the operation of the turbine used to create the air flow.
  • a hair dryer thus comprises a plurality of sound sources respectively related to the turbulence of the flow of the hot air flow to the noise of the turbine, in particular the rotation of the blades and to the noise related to the vibration of the engine coupled to the hull of the dryer -hair.
  • the noise related to the turbine is composed of sound lines correlated to the speed of rotation of the turbine and the number of its blades.
  • the sound spectrum related to the vibration of the engine / hull link is also a line noise.
  • the invention is concerned with the use of an acoustic silencer in a hair dryer, this acoustic silencer making it possible to obtain a passive sound reduction, mainly on the noise related to the flow. air and partly on the noise associated with the turbine.
  • Passive noise reduction devices are known in other fields. These devices use foams or baffles of rock wool or glass. Both these means can contribute to reducing some of the noise generated by the operation of the turbine, generally the part spectral only, as it turns out that these means are inappropriate for dealing with airflow noises.
  • the finesse of the grid of this grid makes it possible to filter a certain number of sound frequencies. Such a grid reduces in particular the sharp whistling of the turbine.
  • the acoustic grid only allows the treatment of noise on the air inlet.
  • the noise transmitted by the air flow and the turbine at the outlet is therefore not taken into consideration.
  • the main purpose of the present invention is therefore to overcome the disadvantages encountered in known passive sound reduction solutions and to make it possible to implement a passive sound reduction within a hair dryer by providing a hair dryer according to the claim 1.
  • the invention therefore proposes to provide the hair dryer, by conformation of its shell, a path between the air inlet and the internal structure carrying the fan longer than the physical distance observed between the rear end of the hair dryer and the internal structure carrying the fan.
  • the invention is therefore interested in treating, as a priority, the noise conveyed by the fluid before the noise radiated by the shell.
  • the noise is generally conveyed by the movement of air in the cowling which is necessarily open at a first end to let in air and at another end to let it out. The noise thus comes out in a privileged way through these openings.
  • the noise is also treated in a more global manner.
  • This acoustic distance being achieved through a certain conformation of the plastic shell at the air inlet to the internal structure supporting the fan and / or the axis of the fan and not with a grid acoustic cutting flow, it allows a reduction in sound with the least possible loss of load.
  • the sound reduction related to the use of such a passive silencer consisting in using a roll-type plastic shell to obtain a reduction of the acoustic radiation of turbulence related to the flow of the hot air flow as well as the turbine used to create this airflow, it makes it possible to process the noises emitted in the spectral zone comprising the mid frequencies and the acute frequencies.
  • a flow must be as laminar as possible to avoid flow problems.
  • the least roughness or convergent / divergent type of form creates turbulence. When turbulence is created then "whirlwind explosion" creates noise.
  • the size of the vortices is correlated to the frequencies emitted: the bigger they are, the more they create low frequencies.
  • the profiling of the air flows according to the invention decreases the swirls and improves the acoustics in addition to lengthening the distance. It is the combined effect of these two principles that improves the acoustics of the hair dryer.
  • the air inlet is on the periphery of the fuselage near the front end of the fuselage in a direction opposite to the air propelled by the hair dryer.
  • the air inlet is located, as the air outlet on the side of the front end of the fuselage of the hair dryer allows a significant extension of the acoustic path traveled by the air.
  • the hair dryer then has no opening on the back, which ensures the protection of the user. It should be noted here that the blown stream must remain predominant on the intake stream in order to avoid the aspiration of elements located near the air outlet, in particular the hair.
  • the plastic shell comprises the internal fuselage which opens the air outlet at the front end, this first internal fuselage being intended to be partially covered on its rear part by the fuselage envelope of larger dimensions and carried by the internal structure bearing the axis of the fan, the front end of the fuselage envelope materializing the air inlet of the hair dryer between the two internal and casing fuselages, on the periphery of the internal fuselage.
  • the lengthening of the acoustic path then obtained is particularly important since it is possible to bring air to circulate all along the internal fuselage before it is re-shifted in the other direction in order to stand out, once heated. , from the inside of the internal fuselage.
  • the conformation of the plastic shell is advantageously further profiled to reduce the creation of turbulence and thus reduce the noise associated with their presence in the stream.
  • the calculation of such a profile is made by studying the flow lines which must then be as laminar as possible.
  • the exact conformation of the plastic shell will advantageously calculated to optimally reduce turbulence.
  • the plastic shell then combines two functions for a single conformation, the first being the elongation of the acoustic path and the second, reducing the creation of turbulence.
  • the conformation of the plastic shell is made by molding.
  • This implementation makes it possible to ensure a very good cohesion of all the paths in which the air circulates and an absence of deterioration of the materials since the paths are directly made with the plastic of the plastic shell.
  • the molding allows a very large shape latitude compatible both with the optimization of the conformation of the shell for the lengthening of the acoustic path and the reduction of turbulence.
  • the hair dryer comprises means for preheating air on the elongate acoustic path traveled by the air.
  • Such preheating means may be implemented for example in the wall of the internal fuselage.
  • the figure 1 schematically represents a first embodiment of a hair dryer 1 comprising a plastic shell 10 and a handle 11 forming a handle.
  • the plastic shell 10 comprises an air inlet EA and an air outlet SA.
  • the air inlet EA illustrated by an arrow is at the end of the handle handle 11.
  • a space 12 also called suction chamber, preceding an internal structure 13 carrying a fan not shown which pulses the air to the air outlet SA also illustrated by an arrow.
  • heating means 20 are placed in the path of the air pulsed by the fan.
  • the motor is advantageously placed in a plastic cap noted 14 present at the rear end of the hair dryer 1.
  • the Figures 2A and 2B represent two variants of the same second embodiment of a hair dryer.
  • the hair dryer 1 here comprises a tapered plastic shell 10 with an EA air inlet and an SA air outlet.
  • the air intake EA is placed at the rear end of the fuselage 10.
  • a baffle is directly shaped by molding of the plastic shell itself. This baffle is made by specific molding of a profile on the inner face of the fuselage 10 and a complementary profile at an internal protrusion of the plastic shell 10 carried by the internal structure 13 carrying the fan, these two moldings being made with a symmetry of revolution.
  • a revolution symmetry lip 15 facing the rear of the fuselage.
  • This lip 15 has a complementary profile of a baffle front 16, acting as a protective cap at the rear end of the fuselage 10.
  • the baffle front 16 is connected by an axial element 17 to the internal structure 13 which carries the fan.
  • the baffle front 16 constitutes a kind of partial plug of the air intake EA at the rear of the fuselage 10.
  • the annular air inlet path obtained between the lip 15 and the front 16 is therefore in a baffle since the presence of the baffle front 16 forces the air to abut on the periphery of the lip 15 at its connection to the fuselage 10. Then, the air is brought back to the rear of the fuselage 10 by the lip 15 before being propelled into a space 12, also called suction chamber, preceding the internal structure 13.
  • the realization presented on the Figure 2B has a lip 15 oriented in the opposite direction to the lip 15 presented on the Figure 2A or a lip 15 of symmetry of revolution oriented towards the front of the hair dryer.
  • a baffle front 16 then has the complementary profile.
  • the presence of the lip 15 pushes the air to abut in an annular bottom formed on the front of the baffle 16.
  • the profile of the baffle front 16 complementary to the profile of the lip 15 causes the air to flow to the rear of the fuselage 10 so that it comes into contact with the annular bottom of the lip 15 located at the periphery thereof at the level of the attachment of the lip 15 to the fuselage.
  • the air is propelled back forwards within the space 12, called the suction chamber, preceding the internal structure 13.
  • the 2B configuration is particularly powerful because it creates little pressure loss and very well calms turbulence. Indeed, it makes it possible to obtain a well laminar flow.
  • the figure 3 represents a third embodiment of a hair dryer according to which the plastic cap 14, placed at the rear end of the plastic shell 10, is pierced with at least one spiral channel 18 and preferably several spirals here four spirals.
  • the EA air inlet is then constituted by the entry or entries of this or these spirals.
  • the air then flowing in its spirals sees its acoustic path extended with respect to the direct rectilinear path of an inlet placed at the rear end of the fuselage 10 and the space 12.
  • the circulation of the air in the spirals 18 is a laminar flow of air which avoids the creation of turbulence and the associated noise. Moreover, the multiplication of the number of spirals makes it possible to limit the losses of load. This makes it possible to use a small spiral channel diameter while ensuring that the pressure losses are not significant. In any case, use of a spiral channel diameter adapted with a suitable number of spirals makes it possible to observe no loss of load or to observe minimum pressure drops.
  • a motor actuating the fan will be placed within the cap 14, possibly on suspensions, for example passive dampers ("silent blocks” in English) to decouple the turbine from the plastic shell and thus avoid the resonances.
  • the motor housing will advantageously decoupled from the body of the hair dryer, here constituted by the plastic shell. This decoupling is done advantageously by suspension.
  • the use of passive dampers at the crankcase retention points thus reduces the solid noise, also felt at the handle.
  • annular seal around the internal structure 13 carrying the fan or around the fan itself to decouple the vibrations of the fan and the shell 10.
  • heating means for example resistors may also be placed near the spiral channels on the path of air.
  • the figure 4 represents an embodiment of the invention in which the EA air inlet is distributed over the contour of an internal fuselage 10a around which is sheathed an envelope fuselage 10b.
  • the fuselage 10b is connected to the fuselage 10a through the internal structure 13 carrying the fan.
  • the air travels the distance between the inlet EA and an internal space 12, constituting a suction chamber delimited at the rear of the internal fuselage 10a.
  • the air circulating on the periphery of the internal fuselage 10a passes at the rear end of the hair dryer before entering the space 12, passing through the fan 13 and before being expelled from the dryer hair by the air outlet SA by being passed over the heating means 20.
  • the figure 5 shows an improvement in the way in which Figures 2A and 2B .
  • this isolation chamber of the engine 19 allows, since the baffle front 16 is mounted partially suspended thanks to the axial structure 17 with respect to the plastic shell, to isolate the engine vibrations thereof.
  • this isolation chamber 19 is connected to the space 12 preceding the internal structure 13, also called the suction chamber, by heat pipes. This allows not only to cool the engine but also to preheat the air.
  • the shell 10 is made integrally between the elements forming the fuselage and the elements making the internal structure 13 carrying the fan.
  • these molded elements are made separately and then assembled to form a hair dryer as shown in the figures shown in that it does not depart from such an embodiment of the principles of the invention.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Cleaning And Drying Hair (AREA)
  • Hair Curling (AREA)

Description

Arrière-plan de l'inventionBackground of the invention

La présente invention se rapporte au domaine général des sèche-cheveux.The present invention relates to the general field of hair dryers.

Typiquement, un sèche-cheveux inclut une coque en plastique fuselée entre une extrémité arrière et une extrémité avant par laquelle sort l'air mis en mouvement et chauffé au sein du sèche-cheveux. La coque plastique définit ainsi au moins une entrée d'air et une sortie d'air et est destinée à accueillir au moins un moteur et un ventilateur. En général, l'axe du ventilateur est porté par une structure interne fixée en partie centrale du fuselage. Il est connu que le fonctionnement d'un sèche-cheveux génère plusieurs types de bruits parmi lesquels le bruit lié à l'écoulement du flux d'air et le bruit lié au fonctionnement de la turbine utilisée pour créer l'écoulement d'air.Typically, a hair dryer includes a tapered plastic shell between a rear end and a front end through which the air set in motion and heated within the hair dryer. The plastic shell thus defines at least one air inlet and one air outlet and is intended to accommodate at least one motor and one fan. In general, the axis of the fan is carried by an internal structure fixed in the central part of the fuselage. It is known that the operation of a hair dryer generates several types of noise among which the noise related to the flow of air flow and noise related to the operation of the turbine used to create the air flow.

Un sèche-cheveux comprend ainsi plusieurs sources sonores liées respectivement aux turbulences de l'écoulement du flux d'air chaud au bruit de la turbine, en particulier la rotation des pâles et au bruit lié à la vibration du moteur couplé à la coque du sèche-cheveux.A hair dryer thus comprises a plurality of sound sources respectively related to the turbulence of the flow of the hot air flow to the noise of the turbine, in particular the rotation of the blades and to the noise related to the vibration of the engine coupled to the hull of the dryer -hair.

Concernant la source de bruit correspondant au bruit d'écoulement du flux lié aux turbulences, il est observé que les turbulences observées sont de toutes dimensions. Cela résulte en un bruit présentant un spectre large bande, riche aussi bien dans les fréquences basses et médiums que dans les fréquences aigües.Regarding the source of noise corresponding to the flow noise of the flow related to turbulence, it is observed that the turbulence observed are of all sizes. This results in noise with a wideband spectrum, rich in both low and midrange frequencies as well as in high frequencies.

En ce qui concerne le bruit lié à la turbine, il est composé de raies sonores corrélées à la vitesse de rotation de la turbine et au nombre de ses pales. Enfin, le spectre sonore lié à la vibration de la liaison moteur/coque est aussi un bruit de raies.As for the noise related to the turbine, it is composed of sound lines correlated to the speed of rotation of the turbine and the number of its blades. Finally, the sound spectrum related to the vibration of the engine / hull link is also a line noise.

Ainsi, plus précisément, l'invention s'intéresse à l'utilisation d'un silencieux acoustique au sein d'un sèche-cheveux, ce silencieux acoustique permettant d'obtenir une réduction sonore passive, principalement sur le bruit lié à l'écoulement de l'air et en partie sur le bruit lié à la turbine.Thus, more specifically, the invention is concerned with the use of an acoustic silencer in a hair dryer, this acoustic silencer making it possible to obtain a passive sound reduction, mainly on the noise related to the flow. air and partly on the noise associated with the turbine.

Des dispositifs de réduction sonore passifs sont connus dans d'autres domaines. Ces dispositifs utilisent des mousses ou bien des chicanes de laine de roche ou de verre. Autant ces moyens peuvent contribuer à diminuer une partie du bruit généré par le fonctionnement de la turbine, généralement la partie spectrale aigüe seulement, autant il s'avère que ces moyens sont inappropriés pour traiter les bruits d'écoulement d'air.Passive noise reduction devices are known in other fields. These devices use foams or baffles of rock wool or glass. Both these means can contribute to reducing some of the noise generated by the operation of the turbine, generally the part spectral only, as it turns out that these means are inappropriate for dealing with airflow noises.

En plus de cela, il n'est pas possible d'utiliser ce genre de solution au sein d'un sèche-cheveux puisqu'il existe des risques d'arrachement de particules du matériau acoustique, ce qui n'est pas envisageable d'un point de vue sanitaire.In addition to this, it is not possible to use this kind of solution in a hair dryer since there are risks of tearing particles of the acoustic material, which is not possible to a sanitary point of view.

Au sein des sèche-cheveux, il est ainsi connu d'utiliser une grille acoustique au niveau de l'entrée d'air habituellement placée à l'extrémité arrière d'une coque en plastique fuselée matérialisant le sèche-cheveux.Within hairdryers, it is thus known to use an acoustic grid at the air intake usually placed at the rear end of a tapered plastic shell materializing the hair dryer.

La finesse de la trame de cette grille permet de filtrer un certain nombre de fréquences sonores. Une telle grille réduit notamment le sifflement aigu de la turbine.The finesse of the grid of this grid makes it possible to filter a certain number of sound frequencies. Such a grid reduces in particular the sharp whistling of the turbine.

Le défaut majeur d'une telle grille acoustique est qu'elle constitue un frein important à l'écoulement de l'air. La réduction sonore se fait ainsi au prix d'une perte de charge au sein de l'écoulement préjudiciable puisque la perte de charge conséquente qui en résulte se traduit par une perte de rendement du sèche-cheveux. Le sèche-cheveux produit alors moins d'air chauffé pour une puissance électrique donnée.The major defect of such an acoustic grid is that it constitutes a significant brake to the flow of air. The sound reduction is thus at the cost of a pressure drop within the detrimental flow since the consequent loss of load results in a loss of efficiency of the hair dryer. The hair dryer then produces less heated air for a given electric power.

En outre, la grille acoustique ne permet que le traitement du bruit sur l'entrée d'air. Le bruit transmis par le flux d'air et la turbine à la sortie n'est donc pas pris en considération.In addition, the acoustic grid only allows the treatment of noise on the air inlet. The noise transmitted by the air flow and the turbine at the outlet is therefore not taken into consideration.

D'autres solutions sont décrites dans les documents WO 2007/123333 et DE 88 05 910 . Le document JP 2006130181 A divulgue un sèche-cheveux comprenant toutes les caractéristiques techniques du préambule de la revendication 1. Ainsi, les solutions existantes pour réduire le bruit, soit ne peuvent être installées au sein d'un sèche-cheveux pour des raisons sanitaires ou des raisons de vieillissement des matériaux, soit génèrent des pertes de charge importantes ruinant le rendement du sèche-cheveux.Other solutions are described in the documents WO 2007/123333 and DE 88 05 910 . The document JP 2006130181 A discloses a hair dryer comprising all the technical features of the preamble of claim 1. Thus, the existing solutions for reducing noise can not be installed in a hair dryer for sanitary reasons or reasons for aging. materials, or generate significant losses of power ruining the performance of the hair dryer.

Objet et résumé de l'inventionObject and summary of the invention

La présente invention a donc pour but principal de palier les inconvénients rencontrés dans les solutions de réduction sonore passive connues et de rendre possible l'implémentation d'une réduction sonore passive au sein d'un sèche-cheveux en proposant un sèche-cheveux selon la revendication 1.The main purpose of the present invention is therefore to overcome the disadvantages encountered in known passive sound reduction solutions and to make it possible to implement a passive sound reduction within a hair dryer by providing a hair dryer according to the claim 1.

L'invention propose donc de munir le sèche-cheveux, par conformation de sa coque, d'un chemin entre l'entrée d'air et la structure interne portant le ventilateur de longueur supérieure à la distance physique observée entre l'extrémité arrière du sèche-cheveux et la structure interne portant le ventilateur.The invention therefore proposes to provide the hair dryer, by conformation of its shell, a path between the air inlet and the internal structure carrying the fan longer than the physical distance observed between the rear end of the hair dryer and the internal structure carrying the fan.

L'invention s'intéresse donc à traiter en priorité le bruit véhiculé par le fluide avant le bruit rayonné par la coque. En effet, il faut noter que le bruit est globalement véhiculé par le déplacement de l'air dans le capotage qui est nécessairement ouvert à une première extrémité pour laisser entrer l'air et à autre une extrémité pour le laisser sortir. Le bruit sort ainsi de manière privilégié par ces ouvertures. En traitant le bruit ainsi véhiculé, on traite aussi le bruit de manière plus globale.The invention is therefore interested in treating, as a priority, the noise conveyed by the fluid before the noise radiated by the shell. Indeed, it should be noted that the noise is generally conveyed by the movement of air in the cowling which is necessarily open at a first end to let in air and at another end to let it out. The noise thus comes out in a privileged way through these openings. By treating the noise thus conveyed, the noise is also treated in a more global manner.

Aussi, en rallongeant le chemin parcouru par l'écoulement d'air à l'aide d'une conformation spécifique de la coque en plastique elle-même, on assure un éloignement accru de la source sonore par rapport à l'oreille de l'utilisateur. En effet même si la source sonore est totalement répartie dans le fuselage, le rallongement du chemin de l'écoulement permet que l'utilisateur n'entende plus un écoulement d'air et une turbine en direct. Cela éloigne artificiellement le bruit de son oreille. En acoustique, éloigner une source sonore revient à faire décroître son intensité par un facteur 1/r, r étant la distance.Also, by lengthening the path traveled by the airflow with a specific conformation of the plastic shell itself, it ensures a greater distance from the sound source relative to the ear of the user. Even if the sound source is totally distributed in the fuselage, the lengthening of the flow path allows the user to no longer hear an air flow and a live turbine. This artificially distances the sound of his ear. In acoustics, moving away a sound source amounts to decreasing its intensity by a factor 1 / r, where r is the distance.

Cet éloignement acoustique étant réalisé grâce à une certaine conformation de la coque plastique au niveau de l'entrée d'air jusqu'à la structure interne supportant le ventilateur et/ou l'axe du ventilateur et non à l'aide d'une grille acoustique coupant le flux, on autorise une réduction sonore avec le moins de perte de charge possible.This acoustic distance being achieved through a certain conformation of the plastic shell at the air inlet to the internal structure supporting the fan and / or the axis of the fan and not with a grid acoustic cutting flow, it allows a reduction in sound with the least possible loss of load.

La réduction sonore liée à l'utilisation d'un tel silencieux passif consistant à utiliser une coque en plastique de type capotage pour obtenir une réduction du rayonnement acoustique des turbulences liées à l'écoulement du flux d'air chaud ainsi que de la turbine utilisée pour créer cet écoulement d'air, permet de traiter les bruits émis dans la zone spectrale comprenant les fréquences médiums et les fréquences aigües.The sound reduction related to the use of such a passive silencer consisting in using a roll-type plastic shell to obtain a reduction of the acoustic radiation of turbulence related to the flow of the hot air flow as well as the turbine used to create this airflow, it makes it possible to process the noises emitted in the spectral zone comprising the mid frequencies and the acute frequencies.

En calculant une conformation du capotage passif permettant que les pertes de charge observées soit les plus faibles possibles, on évite une réduction du rendement thermique de l'appareil tout en réduisant le bruit généré par le fonctionnement de la turbine et la présence des turbulences d'écoulement d'air.By calculating a conformation of the passive rollover allowing the observed pressure drops to be as low as possible, a reduction is avoided. the thermal efficiency of the apparatus while reducing the noise generated by the operation of the turbine and the presence of airflow turbulence.

Il est ici important de noter qu'un écoulement doit être le plus laminaire possible pour éviter des problèmes d'écoulement. La moindre aspérité ou forme de type convergent/divergent crée des turbulences. Quand des turbulences sont créées alors « l'explosion des tourbillons » crée du bruit. La taille des tourbillons est corrélée aux fréquences émises : plus ils sont gros et plus ils créent des basses fréquences. Le fait de profiler les écoulements d'air selon l'invention diminue les tourbillons et améliore l'acoustique en plus de rallonger la distance. C'est l'effet combiné de ces deux principes qui améliore l'acoustique du sèche-cheveux.It is important to note that a flow must be as laminar as possible to avoid flow problems. The least roughness or convergent / divergent type of form creates turbulence. When turbulence is created then "whirlwind explosion" creates noise. The size of the vortices is correlated to the frequencies emitted: the bigger they are, the more they create low frequencies. The profiling of the air flows according to the invention decreases the swirls and improves the acoustics in addition to lengthening the distance. It is the combined effect of these two principles that improves the acoustics of the hair dryer.

Dans l'invention, l'entrée d'air se fait sur la périphérie du fuselage à proximité de l'extrémité avant du fuselage dans un sens opposé à l'air propulsé par le sèche-cheveux.In the invention, the air inlet is on the periphery of the fuselage near the front end of the fuselage in a direction opposite to the air propelled by the hair dryer.

Cette réalisation selon laquelle l'entrée d'air est située, comme la sortie d'air, du côté de l'extrémité avant du fuselage du sèche-cheveux permet un allongement important du chemin acoustique parcouru par l'air. En outre, le sèche-cheveux n'a alors plus d'ouverture sur l'arrière, ce qui permet d'assurer la protection de l'utilisateur. On note ici que le flux soufflé doit rester prédominant sur le flux aspiré afin d'éviter l'aspiration d'éléments situés à proximité de la sortie d'air, notamment des cheveux.This embodiment that the air inlet is located, as the air outlet on the side of the front end of the fuselage of the hair dryer allows a significant extension of the acoustic path traveled by the air. In addition, the hair dryer then has no opening on the back, which ensures the protection of the user. It should be noted here that the blown stream must remain predominant on the intake stream in order to avoid the aspiration of elements located near the air outlet, in particular the hair.

Selon une implémentation avantageuse, la coque plastique comprend le fuselage interne duquel débouche la sortie d'air à l'extrémité avant, ce premier fuselage interne étant destiné à être partiellement recouvert sur sa partie arrière par le fuselage enveloppe de dimensions supérieures et porté par la structure interne portant l'axe du ventilateur, l'extrémité avant du fuselage enveloppe matérialisant l'entrée d'air du sèche-cheveux entre les deux fuselages interne et enveloppe, sur la périphérie du fuselage interne.According to an advantageous implementation, the plastic shell comprises the internal fuselage which opens the air outlet at the front end, this first internal fuselage being intended to be partially covered on its rear part by the fuselage envelope of larger dimensions and carried by the internal structure bearing the axis of the fan, the front end of the fuselage envelope materializing the air inlet of the hair dryer between the two internal and casing fuselages, on the periphery of the internal fuselage.

Le rallongement du chemin acoustique alors obtenu est particulièrement important puisqu'il est possible d'amener l'air à circuler tout le long du fuselage interne avant qu'il ne soit ré-aiguillé dans l'autre sens afin de ressortir, une fois chauffé, de l'intérieur du fuselage interne.The lengthening of the acoustic path then obtained is particularly important since it is possible to bring air to circulate all along the internal fuselage before it is re-shifted in the other direction in order to stand out, once heated. , from the inside of the internal fuselage.

La conformation de la coque plastique est avantageusement en outre profilée pour diminuer la création de turbulences et donc réduire le bruit associé à leur présence dans le flux. Le calcul d'un tel profil est réalisé en étudiant les lignes de flux qu'il faut alors obtenir le plus laminaire possible. Autant la présence d'un double fuselage permet nécessairement, par structure propre de réduire déjà certaines turbulences, autant, avantageusement la conformation exacte de la coque plastique sera avantageusement calculée pour diminuer de manière optimale les turbulences. La coque plastique combine alors deux fonctions pour une seule et même conformation, la première étant l'allongement du chemin acoustique et la seconde, la réduction de la création de turbulences.The conformation of the plastic shell is advantageously further profiled to reduce the creation of turbulence and thus reduce the noise associated with their presence in the stream. The calculation of such a profile is made by studying the flow lines which must then be as laminar as possible. As the presence of a double fuselage necessarily allows, by its own structure to reduce already some turbulence, as advantageously the exact conformation of the plastic shell will advantageously calculated to optimally reduce turbulence. The plastic shell then combines two functions for a single conformation, the first being the elongation of the acoustic path and the second, reducing the creation of turbulence.

Dans une mise en oeuvre préférentielle, la conformation de la coque plastique est réalisée par moulage.In a preferred embodiment, the conformation of the plastic shell is made by molding.

Cette mise en oeuvre permet d'assurer une très bonne cohésion de l'ensemble des chemins dans lesquels l'air circule et une absence de détérioration des matériaux puisque les chemins sont directement réalisés avec le plastique de la coque plastique. En outre, le moulage autorise une très grande latitude de forme compatible, à la fois, avec l'optimisation de la conformation de la coque pour l'allongement du chemin acoustique et la diminution des turbulences.This implementation makes it possible to ensure a very good cohesion of all the paths in which the air circulates and an absence of deterioration of the materials since the paths are directly made with the plastic of the plastic shell. In addition, the molding allows a very large shape latitude compatible both with the optimization of the conformation of the shell for the lengthening of the acoustic path and the reduction of turbulence.

Dans un mode de réalisation amélioré de l'invention, le sèche-cheveux comprend des moyens de préchauffage de l'air sur le chemin acoustique allongé parcouru par l'air.In an improved embodiment of the invention, the hair dryer comprises means for preheating air on the elongate acoustic path traveled by the air.

De tels moyens de préchauffage peuvent être implémentés par exemple dans la paroi du fuselage interne.Such preheating means may be implemented for example in the wall of the internal fuselage.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-dessous, en référence aux dessins annexés qui en illustrent un exemple de réalisation dépourvu de tout caractère limitatif. Sur les figures :

  • la figure 1 montre une vue en perspective d'un premier mode de réalisation d'un sèche-cheveux ;
  • les figures 2A et 2B montrent deux variantes d'un même second mode de réalisation d'un sèche-cheveux;
  • la figure 3 montre un troisième mode de réalisation ;
  • la figure 4 montre un mode de réalisation d'un sèche-cheveux selon l'invention ; et
  • la figure 5 montre une amélioration du second mode de réalisation d'un sèche-cheveux.
Other features and advantages of the present invention will emerge from the description given below, with reference to the accompanying drawings which illustrate an embodiment having no limiting character. In the figures:
  • the figure 1 shows a perspective view of a first embodiment of a hair dryer;
  • the Figures 2A and 2B show two variants of the same second embodiment of a hair dryer;
  • the figure 3 shows a third embodiment;
  • the figure 4 shows an embodiment of a hair dryer according to the invention; and
  • the figure 5 shows an improvement of the second embodiment of a hair dryer.

Description détaillée d'un mode de réalisationDetailed description of an embodiment

La figure 1 représente schématiquement un premier mode de réalisation d'un sèche-cheveux 1 comprenant une coque en plastique 10 et un manche 11 faisant poignée. Conformément au fonctionnement classique d'un sèche-cheveux, la coque plastique 10 comprend une entrée d'air EA et une sortie d'air SA. Dans ce mode de réalisation, l'entrée d'air EA illustrée par une flèche se fait à l'extrémité de la poignée manche 11.The figure 1 schematically represents a first embodiment of a hair dryer 1 comprising a plastic shell 10 and a handle 11 forming a handle. In accordance with the conventional operation of a hair dryer, the plastic shell 10 comprises an air inlet EA and an air outlet SA. In this embodiment, the air inlet EA illustrated by an arrow is at the end of the handle handle 11.

Sur le circuit d'air se trouve ensuite un espace 12, également dit chambre d'aspiration, précédant une structure interne 13 portant un ventilateur non représenté qui pulse l'air vers la sortie d'air SA également illustrée par une flèche. Classiquement et dans l'ensemble des modes de réalisation présentés, des moyens de chauffage 20 sont placés sur le chemin de l'air pulsé par le ventilateur. Ces moyens de préchauffage sont avantageusement profilés ainsi que représenté sur la figure 1 pour limiter la création de turbulences et donc la création de bruit. Ceci est d'autant plus important que l'élévation de température augmente la création de turbulences.On the air circuit is then a space 12, also called suction chamber, preceding an internal structure 13 carrying a fan not shown which pulses the air to the air outlet SA also illustrated by an arrow. Conventionally and in all the embodiments shown, heating means 20 are placed in the path of the air pulsed by the fan. These preheating means are advantageously profiled as shown in FIG. figure 1 to limit the creation of turbulence and thus the creation of noise. This is all the more important as the rise in temperature increases the creation of turbulence.

Dans cette réalisation, le moteur est avantageusement placé dans un calot plastique noté 14 présent à l'extrémité arrière du sèche-cheveux 1.In this embodiment, the motor is advantageously placed in a plastic cap noted 14 present at the rear end of the hair dryer 1.

Les figures 2A et 2B représentent deux variantes d'un même second mode de réalisation d'un sèche-cheveux. Le sèche-cheveux 1 comprend ici une coque plastique 10 fuselée avec une entrée d'air EA et une sortie d'air SA. L'entrée d'air EA est placée au niveau de l'extrémité arrière du fuselage 10. Avant un espace 12, aussi dit chambre d'aspiration, précédant une structure interne 13 portant un ventilateur 13, une chicane est directement conformée par moulage de la coque plastique elle-même. Cette chicane est réalisée par moulage spécifique d'un profil sur la face interne du fuselage 10 et d'un profil complémentaire au niveau d'une excroissance interne de la coque plastique 10 portée par la structure interne 13 portant le ventilateur, ces deux moulages étant réalisés avec une symétrie de révolution.The Figures 2A and 2B represent two variants of the same second embodiment of a hair dryer. The hair dryer 1 here comprises a tapered plastic shell 10 with an EA air inlet and an SA air outlet. The air intake EA is placed at the rear end of the fuselage 10. Before a space 12, also called suction chamber, preceding an internal structure 13 carrying a fan 13, a baffle is directly shaped by molding of the plastic shell itself. This baffle is made by specific molding of a profile on the inner face of the fuselage 10 and a complementary profile at an internal protrusion of the plastic shell 10 carried by the internal structure 13 carrying the fan, these two moldings being made with a symmetry of revolution.

Ainsi, sur la face interne du fuselage 10 est moulée une lèvre de symétrie de révolution 15 tournée vers l'arrière du fuselage. Cette lèvre 15 a un profil complémentaire d'un front de chicane 16, faisant office de calotte de protection à l'extrémité arrière du fuselage 10. Le front de chicane 16 est relié par un élément axial 17 à la structure interne 13 qui porte le ventilateur. Le front de chicane 16 constitue une sorte de bouchon partiel de l'entrée d'air EA à l'arrière du fuselage 10.Thus, on the inner face of the fuselage 10 is molded a revolution symmetry lip 15 facing the rear of the fuselage. This lip 15 has a complementary profile of a baffle front 16, acting as a protective cap at the rear end of the fuselage 10. The baffle front 16 is connected by an axial element 17 to the internal structure 13 which carries the fan. The baffle front 16 constitutes a kind of partial plug of the air intake EA at the rear of the fuselage 10.

Sur la figure 2A, le chemin annulaire d'entrée d'air obtenu entre la lèvre 15 et le front 16 est donc en chicane puisque la présence du front de chicane 16 oblige l'air à venir buter sur le pourtour de la lèvre 15 au niveau de son rattachement au fuselage 10. Ensuite, l'air est ramené vers l'arrière du fuselage 10 par la lèvre 15 avant d'être propulsé dans un espace 12, également dit chambre d'aspiration, précédant la structure interne 13.On the Figure 2A , the annular air inlet path obtained between the lip 15 and the front 16 is therefore in a baffle since the presence of the baffle front 16 forces the air to abut on the periphery of the lip 15 at its connection to the fuselage 10. Then, the air is brought back to the rear of the fuselage 10 by the lip 15 before being propelled into a space 12, also called suction chamber, preceding the internal structure 13.

La réalisation présentée sur la figure 2B possède une lèvre 15 orientée dans le sens opposé à la lèvre 15 présentée sur la figure 2A, soit une lèvre 15 de symétrie de révolution orientée vers l'avant du sèche-cheveux.The realization presented on the Figure 2B has a lip 15 oriented in the opposite direction to the lip 15 presented on the Figure 2A or a lip 15 of symmetry of revolution oriented towards the front of the hair dryer.

Un front de chicane 16 présente alors le profil complémentaire. Dans la variante de la figure 2B, la présence de la lèvre 15 pousse l'air à venir buter dans un fond annulaire pratiqué sur le front de chicane 16. Puis le profil du front de chicane 16 complémentaire du profil de la lèvre 15 amène l'air à circuler vers l'arrière du fuselage 10 afin qu'il vienne au contact du fond annulaire de la lèvre 15 situé à la périphérie de celle-ci au niveau du rattachement de la lèvre 15 au fuselage. Enfin l'air est propulsé de nouveau vers l'avant au sein de l'espace 12, dit chambre d'aspiration, précédant la structure interne 13.A baffle front 16 then has the complementary profile. In the variant of the Figure 2B , the presence of the lip 15 pushes the air to abut in an annular bottom formed on the front of the baffle 16. Then the profile of the baffle front 16 complementary to the profile of the lip 15 causes the air to flow to the rear of the fuselage 10 so that it comes into contact with the annular bottom of the lip 15 located at the periphery thereof at the level of the attachment of the lip 15 to the fuselage. Finally, the air is propelled back forwards within the space 12, called the suction chamber, preceding the internal structure 13.

La configuration 2B est particulièrement performante car elle crée peu de perte de charge et calme très bien les turbulences. En effet, elle permet d'obtenir un flux bien laminaire.The 2B configuration is particularly powerful because it creates little pressure loss and very well calms turbulence. Indeed, it makes it possible to obtain a well laminar flow.

La figure 3 représente un troisième mode de réalisation d'un sèche-cheveux selon lequel le calot plastique 14, placé à l'extrémité arrière de la coque plastique 10, est percé d'au moins un canal en spirale 18 et de préférence de plusieurs spirales ici quatre spirales. L'entrée d'air EA est alors constituée de l'entrée ou des entrées de cette ou ces spirales. L'air circulant alors dans ses spirales voit son chemin acoustique prolongé par rapport au chemin rectiligne direct d'une entrée placée à l'extrémité arrière du fuselage 10 et l'espace 12.The figure 3 represents a third embodiment of a hair dryer according to which the plastic cap 14, placed at the rear end of the plastic shell 10, is pierced with at least one spiral channel 18 and preferably several spirals here four spirals. The EA air inlet is then constituted by the entry or entries of this or these spirals. The air then flowing in its spirals sees its acoustic path extended with respect to the direct rectilinear path of an inlet placed at the rear end of the fuselage 10 and the space 12.

La circulation de l'air dans les spirales 18 est une circulation laminaire de l'air qui évite la création de turbulences et le bruit associé. Par ailleurs, la multiplication du nombre de spirales permet de limiter les pertes de charge. Cela permet d'utiliser un diamètre de canal de spirale peu élevé tout en assurant que les pertes de charge ne soient pas significatives. En tout cas, une utilisation d'un diamètre de canal de spirale adapté avec un nombre de spirales adapté permet de ne pas observer de perte de charge ou d'observer des pertes de charge minimales.The circulation of the air in the spirals 18 is a laminar flow of air which avoids the creation of turbulence and the associated noise. Moreover, the multiplication of the number of spirals makes it possible to limit the losses of load. This makes it possible to use a small spiral channel diameter while ensuring that the pressure losses are not significant. In any case, use of a spiral channel diameter adapted with a suitable number of spirals makes it possible to observe no loss of load or to observe minimum pressure drops.

Avantageusement, dans ce mode de réalisation, un moteur actionnant le ventilateur sera placé au sein du calot 14, éventuellement sur des suspensions, par exemple des amortisseurs passifs (« silent blocs » en anglais) pour découpler la turbine de la coque plastique et éviter ainsi les résonances.Advantageously, in this embodiment, a motor actuating the fan will be placed within the cap 14, possibly on suspensions, for example passive dampers ("silent blocks" in English) to decouple the turbine from the plastic shell and thus avoid the resonances.

De manière plus générale et totalement indépendamment de l'invention telle que revendiquée, le carter moteur sera avantageusement découplé du corps du sèche-cheveux, ici constitué par la coque plastique. Ce découplage se fait avantageusement par suspension. L'utilisation d'amortisseurs passifs au niveau des points de maintien du carter moteur permette ainsi de réduire le bruit solidien, par ailleurs ressenti au niveau du manche.More generally and completely independently of the invention as claimed, the motor housing will advantageously decoupled from the body of the hair dryer, here constituted by the plastic shell. This decoupling is done advantageously by suspension. The use of passive dampers at the crankcase retention points thus reduces the solid noise, also felt at the handle.

Par ailleurs, il est aussi possible d'utiliser un joint annulaire autour de la structure interne 13 portant le ventilateur ou autour du ventilateur lui-même pour découpler les vibrations du ventilateur et de la coque 10.Furthermore, it is also possible to use an annular seal around the internal structure 13 carrying the fan or around the fan itself to decouple the vibrations of the fan and the shell 10.

Pour réchauffer l'air, des moyens de chauffage, par exemple des résistances pourront être également placées à proximité des canaux de spirales sur le chemin de l'air.To heat the air, heating means, for example resistors may also be placed near the spiral channels on the path of air.

La figure 4 représente un mode de réalisation de l'invention dans lequel l'entrée de l'air EA est répartie sur le contour d'un fuselage interne 10a autour duquel est engainé un fuselage enveloppe 10b.The figure 4 represents an embodiment of the invention in which the EA air inlet is distributed over the contour of an internal fuselage 10a around which is sheathed an envelope fuselage 10b.

Avantageusement, comme représenté sur la figure 4, le fuselage 10b est relié au fuselage 10a par l'intermédiaire de la structure interne 13 portant le ventilateur.Advantageously, as shown on the figure 4 , the fuselage 10b is connected to the fuselage 10a through the internal structure 13 carrying the fan.

Dans ce cas, l'air parcourt la distance entre l'entrée EA et un espace interne 12, constituant une chambre d'aspiration, délimité à l'arrière du fuselage interne 10a.In this case, the air travels the distance between the inlet EA and an internal space 12, constituting a suction chamber delimited at the rear of the internal fuselage 10a.

Ainsi, l'air ayant circulé sur le pourtour du fuselage interne 10a passe au niveau de l'extrémité arrière du sèche-cheveux avant d'entrer dans l'espace 12, de passer par le ventilateur 13 et avant d'être expulsé du sèche-cheveux par la sortie d'air SA en étant passé sur les moyens de chauffage 20.Thus, the air circulating on the periphery of the internal fuselage 10a passes at the rear end of the hair dryer before entering the space 12, passing through the fan 13 and before being expelled from the dryer hair by the air outlet SA by being passed over the heating means 20.

On remarque ici encore que la circulation de l'air entre les deux fuselages enveloppe et interne est une circulation laminaire qui réduit la création de turbulences et le bruit associé. Le profilage spécifique du chemin acoustique rallongé permet d'ajouter à l'éloignement de la source sonore, la diminution des phénomènes de turbulences. Cette combinaison de deux fonctions de réduction sonore obtenues avec un profilage spécifique est typique de l'invention.We note here again that the circulation of air between the two fuselages envelope and internal is a laminar circulation which reduces the creation of turbulence and the associated noise. The specific profiling of the extended acoustic path makes it possible to add to the distance of the sound source, the reduction of turbulence phenomena. This combination of two sound reduction functions obtained with a specific profiling is typical of the invention.

La figure 5 montre une amélioration du mode de réalisation des figures 2A et 2B.The figure 5 shows an improvement in the way in which Figures 2A and 2B .

Dans cette amélioration, une chambre d'isolation du moteur est placée dans le front de chicane 16, cette chambre d'isolation du moteur 19 permet, puisque le front de chicane 16 est monté partiellement en suspension grâce à la structure axiale 17 par rapport à la coque plastique, d'isoler les vibrations du moteur de celle-ci.In this improvement, an engine isolation chamber is placed in the baffle front 16, this isolation chamber of the engine 19 allows, since the baffle front 16 is mounted partially suspended thanks to the axial structure 17 with respect to the plastic shell, to isolate the engine vibrations thereof.

Avantageusement cette chambre d'isolation 19 est reliée à l'espace 12 précédant la structure interne 13, également appelé chambre d'aspiration, par des caloducs. Cela permet non seulement de refroidir le moteur mais également de préchauffer l'air.Advantageously, this isolation chamber 19 is connected to the space 12 preceding the internal structure 13, also called the suction chamber, by heat pipes. This allows not only to cool the engine but also to preheat the air.

On remarque enfin que diverses mises en oeuvre peuvent être réalisées selon les principes de l'invention. En particulier, on note ici que, sur les figures proposées, la coque 10 est réalisée de manière monobloc entre les éléments faisant le fuselage et les éléments faisant la structure interne 13 portant le ventilateur. Il est néanmoins tout à fait possible que ces éléments moulés soient réalisés séparément puis assemblés de manière à former un sèche-cheveux tel que représenté sur les figures présentées dans que cela ne départisse une telle réalisation des principes de l'invention.Finally, it should be noted that various implementations can be made according to the principles of the invention. In particular, it is noted here that, in the proposed figures, the shell 10 is made integrally between the elements forming the fuselage and the elements making the internal structure 13 carrying the fan. However, it is quite possible that these molded elements are made separately and then assembled to form a hair dryer as shown in the figures shown in that it does not depart from such an embodiment of the principles of the invention.

Claims (6)

  1. A portable hair dryer (1) including a tapered plastic shell (10) between a rear end and a front end through which flows out the air set into motion and heated by the hair dryer (1), this plastic shell (10) defining a unique air inlet (EA), an air outlet (SA) for expelling air and being intended to accommodate at least one motor and one fan, the shaft of which is borne by an internal structure (13) attached in the central portion of the fuselage (10), the plastic shell (10) being conformed in such a way that all the air expelled through the air outlet (SA) travels an air path between the air inlet (EA) and the internal structure (13) bearing the fan which is longer than the physical distance observed between the rear end of the hair dryer and the internal structure (13) bearing the fan, the shell (10) comprising an internal fuselage (10a) and a covering fuselage (10b),
    the air inlet (EA) being located at the periphery of the shell (10) in proximity of the front end of the shell (10) in a direction opposite to the air expelled by the hair dryer (1), the air inlet being distributed over the contour of the internal fuselage (10a) around which a covering fuselage (10b) is encased;
    characterized in that the air inlet (EA) is annular and is set back axially compared to the air outlet (SA).
  2. The hair dryer (1) according to claim 1, characterized in that the plastic shell (10) comprises the internal fuselage (10a) from which opens out the air outlet (SA) at the front end, this first internal fuselage (10a) being intended to be partly covered on its rear portion by a second so-called covering fuselage (10b) of larger dimensions and borne by the internal structure (13) bearing the shaft of the fan, the front end of the covering fuselage (10b) embodying the air inlet (EA) of the hair dryer (1) between both internal (10a) and covering (10b) fuselages, on the periphery of the internal fuselage (10a).
  3. The hair dryer (1) according to claim 2, characterized in that the air travels the distance between the air inlet (EA) and an internal space (12) forming a suction chamber, delimited at the rear end of the internal fuselage (10a).
  4. The hair dryer (1) according to claim 1, characterized in that the conformation of the plastic shell (10) is made by molding.
  5. The hair dryer (1) according to claim 4, the shell (10) is made as a single piece between the elements making up the fuselage and the internal fuselage (13) bearing the fan.
  6. The hair dryer (1) according to one of the preceding claims, characterized in that it comprises means for preheating the air, placed on the extended acoustic path covered by the air.
EP10809289.1A 2009-12-18 2010-12-17 Hairdryer having a passive silencer system Active EP2512282B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0959217A FR2954055B1 (en) 2009-12-18 2009-12-18 HAIR DRYER WITH PASSIVE SILENT SYSTEM
PCT/FR2010/052775 WO2011073585A2 (en) 2009-12-18 2010-12-17 Hairdryer having a passive silencer system

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EP2512282A2 EP2512282A2 (en) 2012-10-24
EP2512282B1 true EP2512282B1 (en) 2018-04-25

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EP (1) EP2512282B1 (en)
JP (1) JP2013514112A (en)
CN (1) CN102821644A (en)
AU (1) AU2010332630A1 (en)
BR (1) BR112012014871B1 (en)
CA (1) CA2784056A1 (en)
FR (1) FR2954055B1 (en)
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US8893400B2 (en) 2014-11-25
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WO2011073585A2 (en) 2011-06-23
FR2954055A1 (en) 2011-06-24
AU2010332630A1 (en) 2012-06-21
CN102821644A (en) 2012-12-12
US20120266484A1 (en) 2012-10-25
RU2012127881A (en) 2014-01-27
CA2784056A1 (en) 2011-06-23
JP2013514112A (en) 2013-04-25
EP2512282A2 (en) 2012-10-24
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BR112012014871B1 (en) 2020-05-19
WO2011073585A3 (en) 2011-09-09

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