EP3925481B1 - Hair dryer with external and internal housings separated by annular insulation devices - Google Patents

Hair dryer with external and internal housings separated by annular insulation devices Download PDF

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Publication number
EP3925481B1
EP3925481B1 EP21180149.3A EP21180149A EP3925481B1 EP 3925481 B1 EP3925481 B1 EP 3925481B1 EP 21180149 A EP21180149 A EP 21180149A EP 3925481 B1 EP3925481 B1 EP 3925481B1
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EP
European Patent Office
Prior art keywords
hairdryer
fact
propeller
annular insulation
around
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EP21180149.3A
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German (de)
French (fr)
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EP3925481A1 (en
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Jérémy DELHOM
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
    • 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 invention lies in the general field of hairdressing appliances such as, for example, hair dryers.
  • Many domestic blower appliances incorporate a rotating part to produce a radial airflow inside the appliance.
  • the rotating part (propeller) is for example driven in rotation by an electric motor unit incorporated in the device.
  • a hair dryer usually comprises a handle held by the user, as well as a longitudinal portion generally perpendicular to the handle, for the circulation of air.
  • the flow of air emerging from the longitudinal portion is usually heated by heating means.
  • the air flow is generated by a rotating part of the propeller type which sets the air in motion from an air inlet zone to an air outlet zone. air.
  • a hair dryer of this type is for example described in the international application WO 2017/017330 A1 .
  • hair dryers comprising an outer casing (which constitutes the shell of the device) as well as an inner casing which forms a vein of air, an inner casing in which are provided in particular an air circulation chamber provided with a entry zone and an exit zone, an air circulation system comprising an air rectifier, and at least one heating element, as well as a motor configured to drive a propeller in rotation.
  • the prior art discloses ring-shaped vibration isolation means concentrated around the motor-fan unit, which extend between the boxes.
  • the main drawback resulting from this is that only the vibrations of the rotating elements (engine and propeller) are taken into account, so that the vibrations linked to the displacement of the air are not dealt with. Moreover, in the event of a movement of the internal box, only the part of the latter around the motor is guided / maintained by the insulation means, so that the distal portion (that is to say that which is close to the air outlet area) of the internal box risks coming into contact with the external box. Such contact is particularly detrimental to the noise level perceived by the user since all the internal vibrations would then be transmitted to the external box.
  • the present invention proposes a hair dryer comprising an outer casing as well as an inner casing which forms a vein of air, an inner casing in which are provided, coaxially, an air circulation chamber provided with a inlet zone and an outlet zone, an air circulation system comprising a rectifier and at least one heating element, as well as a motor configured to drive a propeller in rotation, between said external box and said internal box being interposed at least two annular insulation devices, characterized in that at least one of the two annular insulation devices is located around the heating element, while the other of the two annular insulation devices is around the motor or propeller.
  • annular isolation device By making use of the terminology “annular isolation device”, it is meant throughout this application, including the claims, a vibration isolation device which has an extremely reduced longitudinal extent, so that is excluded of this definition a device in the form of a sleeve.
  • any device having the shape, in an illustrative and non-limiting manner, of a ring, a torus, a ring, a crown, etc. is included in this terminology.
  • hair dryer designates any household appliance, generally any hairdressing appliance, making it possible to produce against the hair a flow of air, preferably hot, so as to dry the latter.
  • this expression designates hair dryers strictly speaking, but also blower brushes, rotary blower brushes, or even devices that draw the hair through by the Coanda effect, etc.
  • an air gap is created between the internal and external casings, which contributes to better sound and heat insulation.
  • isolation devices in accordance with the invention optionally allows rigid mounting of the motor on the internal casing, in order to guarantee correct positioning of the propeller/motor assembly inside this internal casing.
  • the entire inner box is "suspended" and guided inside the outer box. This is particularly advantageous for optimizing the aeraulic performance of the propeller, by positioning the latter as close as possible to the surrounding fixed parts.
  • the hair dryer 1 comprises a body 10 which is extended downwards by a handle 11, which is only partially shown.
  • This handle typically includes buttons for manually controlling the hair dryer 1.
  • the body 10 has a converging shape from right to left when considering the figure 1 and has a form of revolution with a longitudinal axis A.
  • the body 10 is formed of two coaxial boxes 2a and 2b, which can be described as shells.
  • the two boxes 2a and 2b have an analogous tapered general shape.
  • the casing 2a is external and contains all the components of the hair dryer 1. It houses the casing 2b which constitutes a casing or internal shell and which contains a substantial number of the hair dryer components.
  • the outer box 2a is visible to the user while the inner box 2b is concealed inside the outer box 2a and is therefore not visible to the user, under normal conditions of use.
  • Annular vibration isolation devices preferably forming seals 201 to 206 are arranged between the inner 2b and outer 2a casings and make it possible to isolate them from each other in terms of vibration.
  • An air inlet zone 4 is located at one end of the outer casing 2a and an air outlet zone 5 is located at its opposite end.
  • An air circulation chamber 3 extends between the air inlet zone 4 and the air outlet zone 5.
  • ambient air is sucked in at the inlet zone 4.
  • the ambient air enters the air circulation chamber 3 via an opening made in the inlet zone.
  • the air is set in motion along the air circulation chamber 3 as far as the air outlet zone 5.
  • a concentrator nozzle 50 preferably removable, such as represented at figures 2 and 3 .
  • a circulation system allows this air to move.
  • This circulation system comprises, from upstream to downstream, when the direction of air circulation between the air inlet 4 and air outlet 5 zones is considered, a propeller 7 arranged in the immediate vicinity of the air inlet zone 4, a motor 8, preferably electric, for driving the propeller 7 in rotation, a rectifier 6 for channeling and/or straightening the air at the outlet of the propeller 7.
  • propeller 7 is advantageously chosen from centrifugal or helico-centrifugal propellers. This type of propeller, well known to those skilled in the art, operates on the principle of axial suction at the center of the propeller, then radial ejection of the air, under the effect of centrifugal force.
  • This type of propeller therefore generates a radial air flow.
  • a helical component can also be imparted to the air flow.
  • the system also comprises at least one heating element 12 arranged downstream of the rectifier 6, which makes it possible to heat the air in the downstream part of the circulation chamber 3, before its expulsion through the air outlet zone 5. All these elements are advantageously coaxial, which makes it possible to limit their radial size and to be perfectly integrated into the barrel of a hair dryer. Such a construction is also particularly simple, reliable and easy to implement.
  • the hair dryer also comprises means for controlling and adjusting the motor 8 and/or the heating element 12, which are not shown. here, which make it possible to individually modify parameters such as the rotational speed of the motor and/or the heating temperature, from an off position to a full power position, possibly passing through one or more intermediate positions.
  • the rectifier 6 as is particularly visible at the picture 3 , comprises a body 60 of converging shape from upstream to downstream, for example frustoconical, and whose inlet outer diameter is greater than the outer diameter of the propeller 7. It is placed closest to this propeller so as to capture the vortex of air generated by the latter.
  • the function of the rectifier 6 is to channel the flow of air leaving the propeller 7 and to straighten it.
  • the stator 6 comprises at its periphery several stator blades 61 which here have a helical shape. In a different embodiment, the blades may for example have a spiral shape.
  • the rectifier 6 makes it possible to transform an airflow having a radial or helico-radial component emitted by the propeller 7 into an airflow having essentially or even only an axial component.
  • the body 60 of the rectifier 6 houses in its interior the aforementioned motor 8, which drives the propeller 7 in rotation on itself by a shaft 80.
  • This motor 8 is mounted in an elastically deformable damper support 9 (silent block) of frustoconical external shape. Indeed, such a shape makes it possible not to disturb the flow of air.
  • the annular isolation device located around the motor 8 and/or the propeller 7 will make it possible to process the vibrations generated by the rotation of the motor 8 and/or of the propeller 7 by preventing these vibrations (and therefore the noise) from being transmitted from the internal casing 2b to the external casing 2a in this zone.
  • the annular insulation device located around the heating element 12 will, for its part, make it possible to deal with the vibrations generated by the high-speed movement of the air in this zone by preventing these vibrations (and therefore the noise) from be transmitted from the internal box 2b to the external box 2a.
  • such an arrangement of the annular isolation devices guarantees good mechanical retention between the inner 2b and outer 2a casings by preventing any impromptu contact between them, contact which would transmit vibrations and would therefore generate significant noise.
  • the annular isolation devices preferably consist of O-rings. These are inexpensive components that are readily available and easy to install. However, in different embodiments, they could be seals with a section that is not strictly circular.
  • the annular devices are six in number. However, this number may be smaller and may advantageously be equal to four, as shown in figure 4 .
  • the distal, central and proximal portions of the inner casing 2b are referenced 20, 21 and 22, these qualifiers being taken into consideration of the distance vis-à-vis the air inlet zone 4.
  • the distal portion 20 extends globally around the heating element(s) 12, the central portion 21 around the motor 8 and the proximal portion 22 around the propeller 7. Thanks to this construction, it is possible to adapt the dimension and the shape of each of said portions distal 20, central 21 and proximal 22 to each of the element or elements that it surrounds, as can be seen in the figure 1 .
  • three annular isolation devices 201 to 203 are positioned around the distal portion 20 of the inner casing 2b. They therefore extend around the heating element(s) 12. More precisely, they are positioned approximately around the second downstream half of this distal portion 20, that is to say as close as possible to the air outlet zone 5.
  • Two other annular isolation devices 204 and 205 are positioned around the central portion 21, that is to say around the motor 8. More precisely, they are positioned approximately around the second downstream half of this central portion. Again, this ensures good support and good mechanical guidance between the inner 2b and outer 2a coaxial boxes. In addition, excellent isolation of the vibrations generated by the motor 8 and which would not have been filtered by the shock absorber support 9 is obtained.
  • an additional device 206 is positioned around the proximal portion 22, that is to say around, or in any event, in the immediate vicinity of the propeller 7. As explained previously, this makes it possible to even better absorb the vibrations induced by the high speed rotation of the propeller 7.
  • the number of devices is equal to four.
  • excellent thermal insulation is obtained around the heating element as well as vibrations linked to the circulation of air in the device in this zone where the air flow is important and dense (because it is close to the zone of air outlet 5).
  • the use of two annular isolation devices 201, 202 allows an excellent compromise between cost and effectiveness of the isolation and/or vibration and/or thermal filtering.
  • the two annular isolation devices 204 and 205 are, for their part, as in the embodiment of the figure 1 , positioned around the central portion 21, that is to say around the motor 8, as explained above.
  • annular isolation devices 201 to 206 makes it possible to avoid any contact between the external 2a and internal 2b casings, including taking into account manufacturing, assembly, or even tolerances. of a possible degradation of these boxes during the life of the device.
  • a mounting as rigid as possible of the propeller 7 on the internal casing 2b is generally sought by designers of hair dryers for reasons airflow performance. In particular, designers of hair dryers seek to reduce the distance d illustrated in the figure 1 . However, it is understood that a minimum distance d, that is to say close to 0, is only possible if the propeller is mounted as rigidly as possible with respect to the internal casing. Indeed, as can be understood from the view of the figure 1 , and as explained previously, the propeller 7 is mounted on a motor shaft 80.
  • the motor 8 is itself mounted inside an elastically deformable motor support 9.
  • the propeller 7 and motor 8 assembly can , according to a certain degree of freedom related to the characteristics of the elastically deformable motor support 9, oscillate, move.
  • the invention remarkably allows overall movement of the motor 8 and propeller 7 and inner box 2b assembly inside the outer box 2a, avoiding any contact between said inner box 2b and outer box 2a, thus preventing the transmission of vibrations and therefore of noise.
  • the annular isolation devices 201 to 206 of course have different diameters depending on their positioning. Thus, due to the tapered shape (convergent from upstream to downstream) of the boxes 2a and 2b, their diameter decreases as one approaches the air outlet zone 5.
  • the annular isolation devices 201 to 206 are mounted in grooves G provided for this purpose in the boxes 2a and 2b. It is preferable to dimension them sufficiently wide so that the annular isolation devices can move/expand during operation of the device and do not create an airtightness. This is particularly useful considering the temperature difference that can exist between the inside of the device and the outside.
  • the propeller 7 shown in the figures is configured to be driven in rotation around the longitudinal axis A. It comprises a proximal wall defining an inlet opening provided for admitting into the propeller a flow of air directed along the longitudinal axis.
  • the air is ejected from the propeller 7 by a plurality of channels or cells, radially to the longitudinal axis A.
  • a propeller is then of the cellular type.
  • Such a propeller 7 is of the centrifugal or helico-centrifugal type. This type of propeller 7 is particularly appreciated for its excellent compromise between noise generated and performance, in particular good flow rate and good pressure resistance.
  • the volume emerging from each radial air passage channel is less than the volume set in motion between two blades of a standard hair dryer propeller.
  • the noise pollution caused by the collision of the small volume of air exiting from each channel against fixed elements of the hair dryer is limited.

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  • Cleaning And Drying Hair (AREA)

Description

DOMAINE TECHNIQUE GENERALGENERAL TECHNICAL AREA

L'invention se situe dans le domaine général des appareils de coiffure comme par exemple les sèche-cheveux.The invention lies in the general field of hairdressing appliances such as, for example, hair dryers.

ETAT DE LA TECHNIQUESTATE OF THE ART

De nombreux appareils domestiques soufflants intègrent une pièce rotative pour produire un flux d'air radial à l'intérieur de l'appareil. La pièce rotative (hélice) est par exemple entraînée en rotation par un bloc moteur électrique incorporé à l'appareil.Many domestic blower appliances incorporate a rotating part to produce a radial airflow inside the appliance. The rotating part (propeller) is for example driven in rotation by an electric motor unit incorporated in the device.

De telles pièces rotatives sont notamment utilisées dans des appareils de la catégorie des sèche-cheveux, pour produire un flux d'air sortant. Un sèche-cheveux comprend usuellement un manche tenu par l'utilisateur, ainsi qu'une portion longitudinale généralement perpendiculaire au manche, pour la circulation de l'air. Le flux d'air émergeant de la portion longitudinale est habituellement chauffé par des moyens de chauffage.Such rotating parts are used in particular in appliances of the category of hair dryers, to produce an outgoing air flow. A hair dryer usually comprises a handle held by the user, as well as a longitudinal portion generally perpendicular to the handle, for the circulation of air. The flow of air emerging from the longitudinal portion is usually heated by heating means.

Dans des sèche-cheveux de l'état de la technique, le flux d'air est généré par une pièce rotative de type hélice qui met en mouvement l'air depuis une zone d'entrée d'air vers une zone de sortie d'air.In hair dryers of the state of the art, the air flow is generated by a rotating part of the propeller type which sets the air in motion from an air inlet zone to an air outlet zone. air.

Un sèche-cheveux de ce type est par exemple décrit dans la demande internationale WO 2017/017330 A1 .A hair dryer of this type is for example described in the international application WO 2017/017330 A1 .

Par ailleurs, on connaît de l'art antérieur (voir par exemple US2010/064542 ) des sèche-cheveux comprenant un boitier externe (qui constitue la coque de l'appareil) ainsi qu'un boitier interne qui forme veine d'air, boitier interne dans lequel sont prévus notamment une chambre de circulation d'air munie d'une zone d'entrée et d'une zone de sortie, un système de circulation d'air comprenant un redresseur d'air, et au moins un élément chauffant, ainsi qu'un moteur configuré pour entrainer en rotation une hélice.Moreover, it is known from the prior art (see for example US2010/064542 ) hair dryers comprising an outer casing (which constitutes the shell of the device) as well as an inner casing which forms a vein of air, an inner casing in which are provided in particular an air circulation chamber provided with a entry zone and an exit zone, an air circulation system comprising an air rectifier, and at least one heating element, as well as a motor configured to drive a propeller in rotation.

Dans ce contexte, il est primordial de ne pas transmettre les vibrations provenant de la partie interne de l'appareil au boitier externe afin de limiter le bruit perçu par l'utilisateur, tout en assurant un bon guidage de l'hélice.In this context, it is essential not to transmit the vibrations coming from the internal part of the device to the external box in order to limit the noise perceived by the user, while ensuring good guidance of the propeller.

Dans ce cadre, l'art antérieur divulgue des moyens d'isolation vibratoire de forme annulaire concentrés autour du groupe moto-ventilateur, qui s'étendent entre les boitiers.In this context, the prior art discloses ring-shaped vibration isolation means concentrated around the motor-fan unit, which extend between the boxes.

Le principal inconvénient qui en résulte est que seules les vibrations des éléments tournants (moteur et hélice) sont prises en compte, de sorte que l'on ne traite pas les vibrations liées au déplacement de l'air. De plus, dans l'hypothèse d'un mouvement du boitier interne, seule la partie de celui-ci autour du moteur est guidée / maintenue par les moyens d'isolation, de sorte que la portion distale (c'est-à-dire celle qui est proche de la zone de sortie d'air) du boitier interne risque de venir au contact du boitier externe. Un tel contact est particulièrement préjudiciable au niveau de bruit perçu par l'utilisateur puisque toutes les vibrations internes seraient alors transmises au boitier externe.The main drawback resulting from this is that only the vibrations of the rotating elements (engine and propeller) are taken into account, so that the vibrations linked to the displacement of the air are not dealt with. Moreover, in the event of a movement of the internal box, only the part of the latter around the motor is guided / maintained by the insulation means, so that the distal portion (that is to say that which is close to the air outlet area) of the internal box risks coming into contact with the external box. Such contact is particularly detrimental to the noise level perceived by the user since all the internal vibrations would then be transmitted to the external box.

D'autres appareils connus proposent une isolation sous la forme d'un élément continu (par exemple sous la forme d'un matériau mousse) qui occupe l'intégralité de l'espace situé entre les boitier interne et externe.Other known devices provide insulation in the form of a continuous element (for example in the form of a foam material) which occupies the entire space located between the internal and external boxes.

Un tel élément est lourd de sorte que cela se répercute négativement sur le poids de l'appareil. De plus, il est encombrant, cher et difficile à industrialiser.Such an element is heavy so that this negatively affects the weight of the device. In addition, it is bulky, expensive and difficult to industrialize.

Il existe donc un besoin non satisfait à ce jour de disposer d'un sèche-cheveux qui permette de limiter, voire d'empêcher la transmission de bruits solidiens entre les deux boitiers générés par des vibrations, et ce en ayant recours à des moyens peu encombrants, faciles à fabriquer et économiques.There is therefore an unmet need to date to have a hair dryer which makes it possible to limit or even prevent the transmission of structure-borne noise between the two boxes generated by vibrations, and this by having recourse to means which are not very bulky, easy to manufacture and economical.

PRESENTATION DE L'INVENTIONPRESENTATION OF THE INVENTION

A cet effet, la présente invention propose un sèche-cheveux comprenant un boitier externe ainsi qu'un boitier interne qui forme veine d'air, boitier interne dans lequel sont prévus, coaxialement, une chambre de circulation d'air munie d'une zone d'entrée et d'une zone de sortie, un système de circulation d'air comprenant un redresseur et au moins un élément chauffant, ainsi qu'un moteur configuré pour entrainer en rotation une hélice, entre ledit boitier externe et ledit boitier interne étant intercalés au moins deux dispositifs annulaires d'isolation , caractérisé par le fait qu'au moins l'un des deux dispositifs annulaires d'isolation se situe autour de l'élément chauffant, tandis que l'autre des deux dispositifs annulaires d'isolation se trouve autour du moteur ou de l'hélice.To this end, the present invention proposes a hair dryer comprising an outer casing as well as an inner casing which forms a vein of air, an inner casing in which are provided, coaxially, an air circulation chamber provided with a inlet zone and an outlet zone, an air circulation system comprising a rectifier and at least one heating element, as well as a motor configured to drive a propeller in rotation, between said external box and said internal box being interposed at least two annular insulation devices, characterized in that at least one of the two annular insulation devices is located around the heating element, while the other of the two annular insulation devices is around the motor or propeller.

En faisant usage de la terminologie « dispositif annulaire d'isolation », on entend dans l'ensemble de la présente demande, y compris les revendications, un dispositif d'isolation vibratoire qui présente une étendue longitudinale extrêmement réduite, de sorte qu'est exclu de cette définition un dispositif en forme de manchon. En revanche, n'importe quel dispositif ayant une forme, de manière illustrative et non limitative, d'anneau, de tore, de bague, de couronne, etc. est compris dans ladite terminologie.By making use of the terminology "annular isolation device", it is meant throughout this application, including the claims, a vibration isolation device which has an extremely reduced longitudinal extent, so that is excluded of this definition a device in the form of a sleeve. On the other hand, any device having the shape, in an illustrative and non-limiting manner, of a ring, a torus, a ring, a crown, etc. is included in this terminology.

L'expression « sèche-cheveux » désigne n'importe quel appareil électroménager, généralement n'importe quel appareil de coiffure, permettant de produire à l'encontre des cheveux un flux d'air, préférentiellement chaud, de manière à sécher ces derniers. Ainsi, de manière illustrative et non limitative, cette expression désigne des sèche-cheveux à proprement parler, mais également des brosses soufflantes, des brosses soufflantes rotatives, ou même des dispositifs entrainant les cheveux par effet Coanda, etc.The expression “hair dryer” designates any household appliance, generally any hairdressing appliance, making it possible to produce against the hair a flow of air, preferably hot, so as to dry the latter. Thus, in an illustrative and non-limiting manner, this expression designates hair dryers strictly speaking, but also blower brushes, rotary blower brushes, or even devices that draw the hair through by the Coanda effect, etc.

Grâce aux caractéristiques de l'invention, on limite, voire on empêche la transmission des bruits solidiens entre les deux boitiers.Thanks to the characteristics of the invention, the transmission of structure-borne noise between the two boxes is limited or even prevented.

Par ailleurs, grâce à l'invention, on crée une lame d'air entre les boitiers interne et externe, ce qui contribue à une meilleure isolation sonore et thermique.Furthermore, thanks to the invention, an air gap is created between the internal and external casings, which contributes to better sound and heat insulation.

Du fait du positionnement particulier des dispositifs annulaires d'isolation, on obtient un excellent guidage du boitier interne, même en cas de léger déplacement de ce dernier. Cela permet en outre de placer le moteur dans un support amortisseur (silentbloc) relativement rigide, procurant un meilleur guidage en rotation de l'hélice.Due to the particular positioning of the annular isolation devices, excellent guidance of the internal casing is obtained, even in the event of slight displacement of the latter. This also allows the motor to be placed in a relatively rigid shock absorber support (silentbloc), providing better guidance in rotation of the propeller.

En effet, dans le but d'améliorer les performances aérauliques et sonores du sèche-cheveux, on a tout intérêt à minimiser la distance entre l'hélice et la zone d'aspiration de l'air du boitier interne.Indeed, in order to improve the aeraulic and sound performance of the hair dryer, it is in every interest to minimize the distance between the propeller and the air suction zone of the internal box.

Pour ce faire, il est nécessaire de recourir à un montage rigide ou pratiquement rigide du moteur sur la paroi du boitier interne, ce qui occasionne une mauvaise isolation des vibrations dues aux éléments tournants (moteur et hélice). Il est donc primordial d'empêcher tout contact entre les boitiers interne et externe, comme le propose l'invention.To do this, it is necessary to resort to a rigid or practically rigid mounting of the motor on the wall of the internal box, which causes poor isolation of the vibrations due to the rotating elements (motor and propeller). It is therefore essential to prevent any contact between the internal and external casings, as proposed by the invention.

La présence de dispositifs d'isolation conformément à l'invention permet éventuellement un montage rigide du moteur sur le boitier interne, afin de garantir un bon positionnement de l'ensemble hélice/moteur à l'intérieur de ce boitier interne. De cette manière, c'est tout le boitier interne qui est «suspendu» et guidé à l'intérieur du boitier externe. Cela est particulièrement intéressant pour optimiser les performances aérauliques de l'hélice, en positionnant cette dernière au plus près des pièces fixes environnantes.The presence of isolation devices in accordance with the invention optionally allows rigid mounting of the motor on the internal casing, in order to guarantee correct positioning of the propeller/motor assembly inside this internal casing. In this way, the entire inner box is "suspended" and guided inside the outer box. This is particularly advantageous for optimizing the aeraulic performance of the propeller, by positioning the latter as close as possible to the surrounding fixed parts.

Selon d'autres caractéristiques avantageuses et non limitatives de ce sèche-cheveux, prises seules ou selon une combinaison quelconque d'au moins deux d'entre elles :

  • entre ledit boitier externe et ledit boitier interne sont intercalés au moins quatre dispositifs annulaires d'isolation ;
  • il comporte quatre dispositifs annulaires d'isolation ;
  • au moins un dispositif annulaire d'isolation se situe autour du moteur ;
  • deux dispositifs annulaires d'isolation se situent autour du moteur, tandis que deux autres dispositifs annulaires d'isolation se situent autour de l'élément chauffant ;
  • le boitier interne comprend au moins deux portions, à savoir une portion distale autour de l'élément chauffant et une portion centrale autour du moteur ;
  • le boitier interne comprend au moins une portion additionnelle consistant en une portion proximale autour de l'hélice ;
  • il comporte deux dispositifs annulaires d'isolation autour de la portion distale ;
  • il comporte deux dispositifs annulaires d'isolation autour de la portion centrale ;
  • il comporte un dispositif annulaire d'isolation autour de la portion proximale ;
  • lesdits dispositifs annulaires d'isolation ont des diamètres différents ;
  • lesdits dispositifs annulaires d'isolation ont des diamètres décroissants dans le sens de la circulation d'air entre la zone d'entrée et la zone de sortie ;
  • les dispositifs annulaires d'isolation consistent en des joints toriques ;
  • les joints sont montés dans des gorges que présentent les boitiers externe et interne, ces gorges étant conformées pour permettre aux joints de se déplacer dans la gorge et se dilater.
According to other advantageous and non-limiting characteristics of this hair dryer, taken alone or according to any combination of at least two of them:
  • between said outer casing and said inner casing are interposed at least four annular isolation devices;
  • it comprises four annular isolation devices;
  • at least one annular isolation device is located around the motor;
  • two annular isolation devices are located around the motor, while two other annular isolation devices are located around the heating element;
  • the internal casing comprises at least two portions, namely a distal portion around the heating element and a central portion around the motor;
  • the inner casing comprises at least one additional portion consisting of a proximal portion around the propeller;
  • it comprises two annular isolation devices around the distal portion;
  • it comprises two annular isolation devices around the central portion;
  • it includes an annular isolation device around the proximal portion;
  • said annular isolation devices have different diameters;
  • said annular insulation devices have decreasing diameters in the direction of air circulation between the inlet zone and the outlet zone;
  • the annular isolation devices consist of O-rings;
  • the seals are mounted in grooves present in the outer and inner casings, these grooves being shaped to allow the seals to move in the groove and expand.

DESCRIPTION DES FIGURESDESCRIPTION OF FIGURES

D'autres caractéristiques et avantages de l'invention apparaîtront de la description qui va maintenant en être faite, en référence aux dessins annexés, qui en représentent, à titre indicatif mais non limitatif, différents modes de réalisation possibles.Other characteristics and advantages of the invention will appear from the description which will now be made of it, with reference to the appended drawings, which represent, by way of indication but not limitation, various possible embodiments.

Sur ces dessins :

  • [Fig. 1] la figure 1 est une vue longitudinale en coupe d'un sèche-cheveux conforme à l'invention ;
  • [Fig. 2] la figure 2 est une vue illustrant des composants internes du sèche-cheveux de la figure 1 ;
  • [Fig. 3] la figure 3 est une vue analogue du même sèche-cheveux, sur laquelle des composants externes sont visibles ;
  • [Fig. 4] la figure 4 est une vue de côté d'un mode de réalisation légèrement différent du sèche-cheveux, dont une partie du boitier externe n'est pas représentée afin de rendre plus nettement visibles les dispositifs d'isolation.
In these drawings:
  • [ Fig. 1 ] the figure 1 is a longitudinal sectional view of a hair dryer according to the invention;
  • [ Fig. 2 ] the figure 2 is a view illustrating internal components of the hair dryer of the figure 1 ;
  • [ Fig. 3 ] the picture 3 is a similar view of the same hair dryer, on which external components are visible;
  • [ Fig. 4 ] the figure 4 is a side view of a slightly different embodiment of the hair dryer, part of the outer casing of which is not shown in order to make the insulation devices more clearly visible.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Tel qu'illustré à la figure 1, le sèche-cheveux 1 selon l'invention comporte un corps 10 qui se prolonge vers le bas par un manche 11, lequel n'est que partiellement représenté. Ce manche comprend typiquement des boutons pour commander manuellement le sèche-cheveux 1.As illustrated at figure 1 , the hair dryer 1 according to the invention comprises a body 10 which is extended downwards by a handle 11, which is only partially shown. This handle typically includes buttons for manually controlling the hair dryer 1.

Le corps 10 présente une forme convergente de la droite vers la gauche quand on considère la figure 1 et a une forme de révolution d'axe longitudinal A. Le corps 10 est formé de deux boitiers 2a et 2b coaxiaux, que l'on peut qualifier de coques.The body 10 has a converging shape from right to left when considering the figure 1 and has a form of revolution with a longitudinal axis A. The body 10 is formed of two coaxial boxes 2a and 2b, which can be described as shells.

Les deux boitiers 2a et 2b ont une forme générale analogue fuselée.The two boxes 2a and 2b have an analogous tapered general shape.

Le boitier 2a est externe et renferme l'ensemble des composants du sèche-cheveux 1. Il abrite le boitier 2b qui constitue un boitier ou coque interne et qui renferme un nombre substantiel des composants sèche-cheveux. Le boitier externe 2a est visible par l'utilisateur tandis que le boitier interne 2b est dissimulé à l'intérieur du boitier externe 2a et n'est donc pas visible pour l'utilisateur, en conditions normales d'utilisation. Des dispositifs annulaires d'isolation vibratoire préférentiellement formant joints 201 à 206 sont disposés entre les boitiers interne 2b et externe 2a et permettent de les isoler l'un de l'autre sur le plan vibratoire.The casing 2a is external and contains all the components of the hair dryer 1. It houses the casing 2b which constitutes a casing or internal shell and which contains a substantial number of the hair dryer components. The outer box 2a is visible to the user while the inner box 2b is concealed inside the outer box 2a and is therefore not visible to the user, under normal conditions of use. Annular vibration isolation devices preferably forming seals 201 to 206 are arranged between the inner 2b and outer 2a casings and make it possible to isolate them from each other in terms of vibration.

Une zone d'entrée d'air 4 est situé à une extrémité du boitier externe 2a et une zone de sortie d'air 5 est située à son extrémité opposée. Une chambre de circulation d'air 3 s'étend entre la zone d'entrée d'air 4 et la zone de sortie d'air 5.An air inlet zone 4 is located at one end of the outer casing 2a and an air outlet zone 5 is located at its opposite end. An air circulation chamber 3 extends between the air inlet zone 4 and the air outlet zone 5.

Au cours du fonctionnement du sèche-cheveux 1, de l'air ambiant est aspiré au niveau de la zone d'entrée 4. L'air ambiant pénètre dans la chambre de circulation d'air 3 via une ouverture pratiquée dans la zone d'entrée d'air 4 et dans le boitier interne 2b. L'air est mis en mouvement le long de la chambre de circulation d'air 3 jusqu'à la zone de sortie d'air 5. A cette zone de sortie d'air 5 est habituellement connectée un embout concentrateur 50 préférentiellement amovible, comme représenté aux figures 2 et 3.During the operation of the hair dryer 1, ambient air is sucked in at the inlet zone 4. The ambient air enters the air circulation chamber 3 via an opening made in the inlet zone. air inlet 4 and in the internal box 2b. The air is set in motion along the air circulation chamber 3 as far as the air outlet zone 5. To this air outlet zone 5 is usually connected a concentrator nozzle 50, preferably removable, such as represented at figures 2 and 3 .

Un système de circulation permet de mettre en mouvement cet air. Ce système de circulation comprend, d'amont en aval, quand on considère le sens de circulation de l'air entre les zones d'entrée d'air 4 et de sortie d'air 5, une hélice 7 agencée à proximité immédiate de la zone d'entrée d'air 4, un moteur 8, préférentiellement électrique, permettant d'entraîner en rotation l'hélice 7, un redresseur 6 permettant de canaliser et/ou redresser l'air en sortie d'hélice 7. Plus précisément, l'hélice 7 est avantageusement choisie parmi les hélices centrifuges ou hélico-centrifuges. Ce type d'hélice, bien connu de l'homme du métier fonctionne suivant le principe d'une aspiration axiale au centre de l'hélice, puis d'une éjection radiale de l'air, sous l'effet de la force centrifuge. Ce type d'hélice engendre donc un flux d'air radial. Suivant la construction de l'hélice 7, une composante hélicoïdale peut également être conférée au flux d'air. Ces hélices présentent des compromis performance / bruit intéressants et trouvent donc tout leur intérêt pour une utilisation dans un sèche-cheveux tel que celui de l'invention.A circulation system allows this air to move. This circulation system comprises, from upstream to downstream, when the direction of air circulation between the air inlet 4 and air outlet 5 zones is considered, a propeller 7 arranged in the immediate vicinity of the air inlet zone 4, a motor 8, preferably electric, for driving the propeller 7 in rotation, a rectifier 6 for channeling and/or straightening the air at the outlet of the propeller 7. More specifically, propeller 7 is advantageously chosen from centrifugal or helico-centrifugal propellers. This type of propeller, well known to those skilled in the art, operates on the principle of axial suction at the center of the propeller, then radial ejection of the air, under the effect of centrifugal force. This type of propeller therefore generates a radial air flow. Depending on the construction of the propeller 7, a helical component can also be imparted to the air flow. These propellers present interesting performance/noise compromises and therefore find all their advantage for use in a hair dryer such as that of the invention.

Le système comprend également au moins un élément chauffant 12 agencé en aval du redresseur 6, 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 d'air 5. Tous ces éléments sont avantageusement coaxiaux ce qui permet de limiter leur encombrement radial et de parfaitement s'intégrer dans le fût d'un sèche-cheveux. Une telle construction est en outre particulière simple, fiable et facile à mettre en œuvre.The system also comprises at least one heating element 12 arranged downstream of the rectifier 6, which makes it possible to heat the air in the downstream part of the circulation chamber 3, before its expulsion through the air outlet zone 5. All these elements are advantageously coaxial, which makes it possible to limit their radial size and to be perfectly integrated into the barrel of a hair dryer. Such a construction is also particularly simple, reliable and easy to implement.

Le sèche-cheveux comprend également des moyens de commande et de réglage du moteur 8 et/ou de l'élément chauffant 12, qui ne sont pas représentés ici, qui permettent de modifier individuellement des paramètres tels que la vitesse de rotation du moteur et/ou la température de chauffe, d'une position éteinte à une position de pleine puissance, éventuellement en passant par un ou des positions intermédiaires.The hair dryer also comprises means for controlling and adjusting the motor 8 and/or the heating element 12, which are not shown. here, which make it possible to individually modify parameters such as the rotational speed of the motor and/or the heating temperature, from an off position to a full power position, possibly passing through one or more intermediate positions.

Le redresseur 6, ainsi que cela est particulièrement visible à la figure 3, comporte un corps 60 de forme convergente d'amont en aval, par exemple tronconique, et dont le diamètre extérieur d'entrée est supérieur au diamètre extérieur de l'hélice 7. Il est placé au plus proche de cette hélice de manière à capter le tourbillon d'air généré par cette dernière. La fonction du redresseur 6 et de canaliser le flux d'air sortant de l'hélice 7 et de le redresser. À cet effet, le redresseur 6 comportent à sa périphérie plusieurs aubages de redresseur 61 qui ont ici une forme hélicoïdale. Dans une forme de réalisation différente, les aubages peuvent avoir par exemple une forme en colimaçon. En d'autres termes, le redresseur 6 permet de transformer un flux d'air ayant une composante radiale ou hélico radiale émis par l'hélice 7 en un flux d'air ayant essentiellement voire uniquement une composante axiale.The rectifier 6, as is particularly visible at the picture 3 , comprises a body 60 of converging shape from upstream to downstream, for example frustoconical, and whose inlet outer diameter is greater than the outer diameter of the propeller 7. It is placed closest to this propeller so as to capture the vortex of air generated by the latter. The function of the rectifier 6 is to channel the flow of air leaving the propeller 7 and to straighten it. To this end, the stator 6 comprises at its periphery several stator blades 61 which here have a helical shape. In a different embodiment, the blades may for example have a spiral shape. In other words, the rectifier 6 makes it possible to transform an airflow having a radial or helico-radial component emitted by the propeller 7 into an airflow having essentially or even only an axial component.

Ainsi qu'on peut le constater en comparant d'une part la figure 1 et, d'autre part, les figures 2 et 3, le corps 60 du redresseur 6 abrite en son intérieur le moteur 8 précité, lequel entraîne l'hélice 7 en rotation sur elle-même par un arbre 80.As can be seen by comparing on the one hand the figure 1 and, on the other hand, the figures 2 and 3 , the body 60 of the rectifier 6 houses in its interior the aforementioned motor 8, which drives the propeller 7 in rotation on itself by a shaft 80.

Ce moteur 8 est monté dans un support amortisseur élastiquement déformable 9 (silentbloc) de forme extérieure tronconique. En effet, une telle forme permet de ne pas perturber le flux d'air.This motor 8 is mounted in an elastically deformable damper support 9 (silent block) of frustoconical external shape. Indeed, such a shape makes it possible not to disturb the flow of air.

Conformément à l'invention et comme cela est visible sur les figures 1 et 4, entre le boitier externe 2a et le boitier interne 2b sont intercalés au moins deux dispositifs annulaires d'isolation, au moins l'un d'entre eux se situant autour de l'élément chauffant 12, tandis que l'autre des deux dispositifs se trouve autour du moteur 8 et/ou de l'hélice 7. Ainsi, grâce à l'invention, les vibrations engendrées par le flux d'air, et pas uniquement les vibrations engendrées par le moteur et l'hélice, sont traitées sur l'intégralité du parcours du flux d'air. Plus précisément, le dispositif annulaire d'isolation situé autour du moteur 8 et/ou de l'hélice 7 va permettre de traiter les vibrations engendrées par la rotation du moteur 8 et/ou de l'hélice 7 en empêchant ces vibrations (et donc le bruit) de se transmettre depuis le boitier interne 2b vers le boitier externe 2a dans cette zone. Le dispositif annulaire d'isolation situé autour de l'élément chauffant 12 va, quant à lui, permettre de traiter les vibrations engendrées par le déplacement à haute vitesse de l'air dans cette zone en empêchant ces vibration (et donc le bruit) de se transmettre depuis le boitier interne 2b vers le boitier externe 2a. En outre, une telle disposition des dispositifs annulaires d'isolation garantit un bon maintien mécanique entre les boitiers interne 2b et externe 2a en empêchant tout contact impromptu entre eux, contact qui serait transmetteur des vibrations et engendrerait donc un bruit important.In accordance with the invention and as can be seen on the figure 1 and 4 , between the outer casing 2a and the inner casing 2b are interposed at least two annular insulation devices, at least one of them located around the heating element 12, while the other of the two devices located around the engine 8 and/or the propeller 7. Thus, thanks to the invention, the vibrations generated by the flow of air, and not only the vibrations generated by the engine and the propeller, are processed on the entire airflow path. More precisely, the annular isolation device located around the motor 8 and/or the propeller 7 will make it possible to process the vibrations generated by the rotation of the motor 8 and/or of the propeller 7 by preventing these vibrations (and therefore the noise) from being transmitted from the internal casing 2b to the external casing 2a in this zone. The annular insulation device located around the heating element 12 will, for its part, make it possible to deal with the vibrations generated by the high-speed movement of the air in this zone by preventing these vibrations (and therefore the noise) from be transmitted from the internal box 2b to the external box 2a. In addition, such an arrangement of the annular isolation devices guarantees good mechanical retention between the inner 2b and outer 2a casings by preventing any impromptu contact between them, contact which would transmit vibrations and would therefore generate significant noise.

Dans la description qui suit, les dispositifs annulaires d'isolation consistent préférentiellement en des joints toriques. Il s'agit de composants peu onéreux, facilement disponibles et aisés à installer. Toutefois, dans des modes de réalisation différents, il pourrait s'agir de joints à section non strictement circulaire.In the following description, the annular isolation devices preferably consist of O-rings. These are inexpensive components that are readily available and easy to install. However, in different embodiments, they could be seals with a section that is not strictly circular.

Ainsi que cela a déjà été mentionné plus haut, on limite, voire on empêche la transmission des bruits solidiens entre les boitiers externe 2a et interne 2b. De plus, on crée une lame d'air entre les boitiers interne 2b et externe 2a, ce qui contribue à une meilleure isolation sonore et thermique.As has already been mentioned above, the transmission of structure-borne noise between the external 2a and internal 2b boxes is limited or even prevented. In addition, an air gap is created between the internal 2b and external 2a boxes, which contributes to better sound and heat insulation.

Dans l'exemple non limitatif de réalisation représenté à la figure 1, les dispositifs annulaires sont au nombre de six. Toutefois, ce nombre peut être plus réduit et peut être avantageusement égal à quatre, comme le montre la figure 4.In the non-limiting embodiment shown in figure 1 , the annular devices are six in number. However, this number may be smaller and may advantageously be equal to four, as shown in figure 4 .

En référence à la figure 1, on a référencé 20, 21 et 22 les portions distale, centrale et proximale du boitier interne 2b, ces qualificatifs étant pris en considération de la distance vis-à-vis de la zone d'entrée d'air 4.With reference to the figure 1 , the distal, central and proximal portions of the inner casing 2b are referenced 20, 21 and 22, these qualifiers being taken into consideration of the distance vis-à-vis the air inlet zone 4.

La portion distale 20 s'étend globalement autour du ou des éléments chauffants 12, la portion centrale 21 autour du moteur 8 et la portion proximale 22 autour de l'hélice 7. Grâce à cette construction, il est possible de bien adapter la dimension et la forme de chacune desdites portions distale 20, central 21 et proximale 22 à chacun du ou des éléments qu'elle entoure, comme on peut le voir sur la figure 1.The distal portion 20 extends globally around the heating element(s) 12, the central portion 21 around the motor 8 and the proximal portion 22 around the propeller 7. Thanks to this construction, it is possible to adapt the dimension and the shape of each of said portions distal 20, central 21 and proximal 22 to each of the element or elements that it surrounds, as can be seen in the figure 1 .

Selon le mode de réalisation illustré en figure 1, trois dispositifs annulaires d'isolation 201 à 203 sont positionnés autour de la portion distale 20 du boitier interne 2b. Ils s'étendent donc autour du ou des éléments chauffants 12. Plus précisément, ils sont positionnés approximativement autour de la deuxième moitié aval de cette portion distale 20, c'est-à-dire au plus près de la zone de sortie d'air 5.According to the embodiment illustrated in figure 1 , three annular isolation devices 201 to 203 are positioned around the distal portion 20 of the inner casing 2b. They therefore extend around the heating element(s) 12. More precisely, they are positioned approximately around the second downstream half of this distal portion 20, that is to say as close as possible to the air outlet zone 5.

On s'assure ainsi d'un bon maintien et d'un bon guidage mécanique entre les boitiers interne 2b et externe 2a coaxiaux, empêchant tout risque de contact direct entre le boitier interne 2b et le boitier externe 2a au niveau de l'élément chauffant. De plus, on obtient une excellente isolation thermique autour de l'élément chauffant ainsi que des vibrations liées à la circulation d'air dans l'appareil dans cette zone où le flux d'air est important et dense (car proche de la zone de sortie d'air 5).This ensures good support and good mechanical guidance between the inner 2b and outer 2a coaxial boxes, preventing any risk of direct contact between the inner box 2b and the outer box 2a at the level of the heating element. . In addition, excellent thermal insulation is obtained around the heating element as well as vibrations linked to the circulation of air in the device in this zone where the air flow is important and dense (because it is close to the zone of air outlet 5).

Deux autres dispositifs annulaires d'isolation 204 et 205 sont positionnés autour de la portion centrale 21, c'est-à-dire autour du moteur 8. Plus précisément, ils sont positionnés approximativement autour de la deuxième moitié aval de cette portion centrale. A nouveau, on s'assure ainsi d'un bon maintien et d'un bon guidage mécanique entre les boitiers interne 2b et externe 2a coaxiaux. De plus, on obtient une excellente isolation des vibrations générées par le moteur 8 et qui n'auraient pas été filtrées par le support amortisseur 9.Two other annular isolation devices 204 and 205 are positioned around the central portion 21, that is to say around the motor 8. More precisely, they are positioned approximately around the second downstream half of this central portion. Again, this ensures good support and good mechanical guidance between the inner 2b and outer 2a coaxial boxes. In addition, excellent isolation of the vibrations generated by the motor 8 and which would not have been filtered by the shock absorber support 9 is obtained.

Enfin, un dispositif additionnel 206 est positionné autour de la portion proximale 22, c'est-à-dire autour, ou en tout état de cause, à proximité immédiate de l'hélice 7. Comme expliqué précédemment, cela permet d'encore mieux absorber les vibrations induites par la rotation à haute vitesse de l'hélice 7.Finally, an additional device 206 is positioned around the proximal portion 22, that is to say around, or in any event, in the immediate vicinity of the propeller 7. As explained previously, this makes it possible to even better absorb the vibrations induced by the high speed rotation of the propeller 7.

Dans la variante de la figure 4 et comme déjà précisé, le nombre de dispositifs est égal à quatre. On note la présence de deux dispositifs 201 et 202 autour de la portion distale 20, situés respectivement à proximité de ses extrémités opposées. On s'assure ainsi d'un bon maintien et d'un bon guidage mécanique entre les boitiers interne 2b et externe 2a coaxiaux, empêchant tout risque de contact direct entre le boitier interne 2b et le boitier externe 2a au niveau de l'élément chauffant. De plus, on obtient une excellente isolation thermique autour de l'élément chauffant ainsi que des vibrations liées à la circulation d'air dans l'appareil dans cette zone où le flux d'air est important et dense (car proche de la zone de sortie d'air 5). L'utilisation de deux dispositifs annulaires d'isolation 201, 202 permet un excellent compromis entre coût et efficacité de l'isolation et/ou du filtrage vibratoire et/ou thermique.In the variant of figure 4 and as already specified, the number of devices is equal to four. Note the presence of two devices 201 and 202 around the distal portion 20, located respectively close to its opposite ends. This ensures good support and good mechanical guidance between the inner 2b and outer 2a coaxial boxes, preventing any risk of direct contact between the inner box 2b and the outer box 2a at the level of the heating element. . In addition, excellent thermal insulation is obtained around the heating element as well as vibrations linked to the circulation of air in the device in this zone where the air flow is important and dense (because it is close to the zone of air outlet 5). The use of two annular isolation devices 201, 202 allows an excellent compromise between cost and effectiveness of the isolation and/or vibration and/or thermal filtering.

Les deux dispositifs annulaires d'isolation 204 et 205 sont, quant à eux, comme dans le mode de réalisation de la figure 1, positionnés autour de la portion centrale 21, c'est-à-dire autour du moteur 8, comme expliqué précédemment.The two annular isolation devices 204 and 205 are, for their part, as in the embodiment of the figure 1 , positioned around the central portion 21, that is to say around the motor 8, as explained above.

Quel que soit le mode de réalisation considéré, la présence de ces dispositifs annulaire d'isolation 201 à 206 permet d'éviter tout contact entre les boitiers externe 2a et interne 2b, y compris en tenant compte des tolérances de fabrication, de montage, voire d'une éventuelle dégradation de ces boitiers au cours de la durée de vie de l'appareil.Whatever the embodiment considered, the presence of these annular isolation devices 201 to 206 makes it possible to avoid any contact between the external 2a and internal 2b casings, including taking into account manufacturing, assembly, or even tolerances. of a possible degradation of these boxes during the life of the device.

En outre, cela autorise un montage rigide ou quasi rigide de l'hélice 7 vis-à-vis du boitier interne 2b. En effet, les vibrations engendrées par la rotation de l'hélice 7, voire un éventuel déplacement axial ou radial de l'hélice 7, seraient alors transmises au boitier interne 2b (compte tenu du montage rigide ou quasi rigide), mais le boitier interne 2b serait alors « suspendu » à l'intérieur du boitier externe 2a grâce à la présence desdits dispositifs annulaires d'isolation 201-206 et à leur emplacement tels que décrit. Tout contact direct entre le boitier interne 2b (potentiellement vibrant voire mouvant) et le boitier externe 2a est ainsi évité, ce qui empêche le bruit (issu des vibrations) de se propager au boitier externe 2a et donc d'être perçu par l'utilisateur du sèche-cheveux.In addition, this allows a rigid or quasi-rigid mounting of the propeller 7 vis-à-vis the internal box 2b. Indeed, the vibrations generated by the rotation of the propeller 7, or even a possible axial or radial displacement of the propeller 7, would then be transmitted to the internal box 2b (given the rigid or quasi-rigid assembly), but the internal box 2b would then be "suspended" inside the outer casing 2a thanks to the presence of said annular isolation devices 201-206 and their location as described. Any direct contact between the inner box 2b (potentially vibrating or even moving) and the outer box 2a is thus avoided, which prevents the noise (resulting from vibrations) from spreading to the outer box 2a and therefore from being perceived by the user. hair dryer.

Un montage aussi rigide que possible de l'hélice 7 sur le boitier interne 2b est généralement recherché par les concepteurs de sèche-cheveux pour des raisons de performances aérauliques. En particulier, les concepteurs de sèche- cheveux cherchent à réduire la distance d illustrée à la figure 1. Or, on comprend qu'une distance d minimale, c'est-à-dire proche de 0, n'est possible que si l'hélice est montée de la manière la plus rigide possible par rapport au boitier interne. En effet, comme on peut le comprendre à la vue de la figure 1, et comme expliqué précédemment, l'hélice 7 est montée sur un arbre moteur 80. Le moteur 8 est lui-même monté à l'intérieur d'un support moteur élastiquement déformable 9. Ainsi, l'ensemble hélice 7 et moteur 8 peuvent, selon un certain degré de liberté lié aux caractéristiques du support moteur élastiquement déformable 9, osciller, bouger. Cela est indispensable dans un sèche-cheveux de l'art antérieur pour éviter de transmettre les vibrations, et donc le bruit à la coque externe. Mais cela est contradictoire avec le souhait énoncé précédemment de réduire la distance d. Toutefois, l'invention autorise de manière remarquable un mouvement global de l'ensemble moteur 8 et hélice 7 et boitier interne 2b à l'intérieur du boitier externe 2a, en évitant tout contact entre lesdits boitier interne 2b et externe 2a, empêchant ainsi la transmission des vibrations et donc du bruit.A mounting as rigid as possible of the propeller 7 on the internal casing 2b is generally sought by designers of hair dryers for reasons airflow performance. In particular, designers of hair dryers seek to reduce the distance d illustrated in the figure 1 . However, it is understood that a minimum distance d, that is to say close to 0, is only possible if the propeller is mounted as rigidly as possible with respect to the internal casing. Indeed, as can be understood from the view of the figure 1 , and as explained previously, the propeller 7 is mounted on a motor shaft 80. The motor 8 is itself mounted inside an elastically deformable motor support 9. Thus, the propeller 7 and motor 8 assembly can , according to a certain degree of freedom related to the characteristics of the elastically deformable motor support 9, oscillate, move. This is essential in a hair dryer of the prior art to avoid transmitting the vibrations, and therefore the noise, to the outer shell. But this is contradictory with the previously stated desire to reduce the distance d. However, the invention remarkably allows overall movement of the motor 8 and propeller 7 and inner box 2b assembly inside the outer box 2a, avoiding any contact between said inner box 2b and outer box 2a, thus preventing the transmission of vibrations and therefore of noise.

Les dispositifs annulaires d'isolation 201 à 206 ont bien entendu des diamètres différents selon leur positionnement. Ainsi, du fait de la forme fuselée (convergente d'amont en aval) des boitiers 2a et 2b, leur diamètre décroit au fur et à mesure que l'on se rapproche de la zone de sortie d'air 5.The annular isolation devices 201 to 206 of course have different diameters depending on their positioning. Thus, due to the tapered shape (convergent from upstream to downstream) of the boxes 2a and 2b, their diameter decreases as one approaches the air outlet zone 5.

Avantageusement, les dispositifs annulaires d'isolation 201 à 206 sont montés dans des gorges G prévues à cet effet dans les boitiers 2a et 2b. Il est préférable de dimensionner ces dernières de manière suffisamment large pour que les dispositifs annulaires d'isolation puissent se déplacer/se dilater lors du fonctionnement de l'appareil et ne créent pas une étanchéité à l'air. Cela est particulièrement utile compte tenu de la différence de température pouvant exister entre l'intérieur de l'appareil et l'extérieur.Advantageously, the annular isolation devices 201 to 206 are mounted in grooves G provided for this purpose in the boxes 2a and 2b. It is preferable to dimension them sufficiently wide so that the annular isolation devices can move/expand during operation of the device and do not create an airtightness. This is particularly useful considering the temperature difference that can exist between the inside of the device and the outside.

L'hélice 7 représentée sur les figures est configurée pour être entraînée en rotation autour de l'axe longitudinal A. Elle comprend une paroi proximale définissant une ouverture d'admission prévue pour admettre dans l'hélice un flux d'air dirigé selon l'axe longitudinal.The propeller 7 shown in the figures is configured to be driven in rotation around the longitudinal axis A. It comprises a proximal wall defining an inlet opening provided for admitting into the propeller a flow of air directed along the longitudinal axis.

De plus, elle comprend une pluralité de canaux de passage d'air en communication fluidique avec l'ouverture d'admission, lesdits canaux de passage d'air étant positionnés autour de l'axe longitudinal, chaque canal de passage d'air s'étendant radialement vers l'extérieur de l'axe longitudinal, entre une extrémité d'entrée et une extrémité de sortie. Ainsi, comme on peut le voir sur les figures 2 et 3, l'air est éjecté de l'hélice 7 par une pluralité de canaux ou de cellules, radialement à l'axe longitudinal A. Une telle hélice est alors du type cellulaire.Furthermore, it comprises a plurality of air passage channels in fluid communication with the intake opening, said air passage channels being positioned around the longitudinal axis, each air passage channel extending radially outward from the longitudinal axis, between an inlet end and an outlet end. Thus, as can be seen from the figures 2 and 3 , the air is ejected from the propeller 7 by a plurality of channels or cells, radially to the longitudinal axis A. Such a propeller is then of the cellular type.

Dans une telle hélice 7, en réponse à la rotation de l'hélice 7, un flux d'air est admis au niveau de l'ouverture d'admission, puis est entraîné radialement vers l'extérieur sous l'effet de la force centrifuge engendrée par la rotation de l'hélice. Le flux d'air radial passe par les extrémités d'entrée et les extrémités de sortie des canaux de passage d'air. Un flux radial sortant de débit élevé peut être obtenu.In such a propeller 7, in response to the rotation of the propeller 7, an air flow is admitted at the level of the inlet opening, then is driven radially outwards under the effect of centrifugal force. generated by the rotation of the propeller. The radial airflow passes through the inlet ends and the outlet ends of the air passage channels. A high rate outgoing radial flow can be obtained.

Une telle hélice 7 est du type centrifuge ou hélico centrifuge. Ce type d'hélice 7 est particulièrement appréciée pour son excellent compromis entre bruit généré et performances, en particulier bon débit et bonne tenue à la pression.Such a propeller 7 is of the centrifugal or helico-centrifugal type. This type of propeller 7 is particularly appreciated for its excellent compromise between noise generated and performance, in particular good flow rate and good pressure resistance.

Le volume sortant de chaque canal radial de passage d'air est inférieur au volume mis en mouvement entre deux pales d'une hélice standard de sèche-cheveux. Ainsi, on limite la nuisance sonore causée par la collision du petit volume d'air sortant de chaque canal contre des éléments fixes du sèche-cheveux.The volume emerging from each radial air passage channel is less than the volume set in motion between two blades of a standard hair dryer propeller. Thus, the noise pollution caused by the collision of the small volume of air exiting from each channel against fixed elements of the hair dryer is limited.

On observe en outre une augmentation des fréquences propres de vibration, par rapport à une hélice centrifuge de l'état de la technique. Le bruit acoustique généré par la mise en mouvement de l'air au sein de l'hélice est donc plus aigu.There is also an increase in natural vibration frequencies, compared to a centrifugal propeller of the state of the art. The acoustic noise generated by the setting in motion of the air within the propeller is therefore more acute.

Bien entendu, en lieu et place d'une telle hélice, on peut faire usage d'une hélice de forme traditionnelle, connue de l'art antérieur, telle que celle décrite dans WO2017/017330 .Of course, instead of such a propeller, one can make use of a propeller of traditional shape, known from the prior art, such as that described in WO2017/017330 .

Claims (14)

  1. Hairdryer (1) comprising an external housing (2a) as well as an internal housing (2b) forming an air flow, internal housing (2b) wherein are provided, coaxially, an air circulation chamber (3) equipped with an inlet region (4) and an outlet region (5), an air circulation system comprising a straightener (6), and at least one heating element (12), as well as a motor (8) configured to drive a propeller (7) to rotate, between said external housing (2a) et said internal housing (2b) being interposed at least two annular insulation devices (201 -206), characterised by the fact that at least one (201-203) of the two annular insulation devices (201-206) is located around the heating element (12), while the other (204-206) of the two annular insulation devices (201-206) is positioned around the motor (8) or the propeller (7).
  2. Hairdryer (1) according to claim 1, characterised by the fact that between said external housing (2a) and said internal housing (2b) are interposed at least four annular insulation devices (201-206).
  3. Hairdryer (1) according to claim 2, characterised by the fact that it comprises four annular insulation devices (201-206).
  4. Hairdryer (1) according to one of the preceding claims, characterised by the fact that at least one annular insulation device (204-205) is located around the motor (8).
  5. Hairdryer (1) according to claim 3, characterised by the fact that two annular insulation devices (204-205) are located around the motor (8), while two other annular insulation devices (201-203) are located around the heating element (12).
  6. Hairdryer (1) according to one of the preceding claims, characterised by the fact that the internal housing (2b) comprises at least two portions, namely a distal portion (20) around the heating element (12) and a central portion (21) around the motor (8).
  7. Hairdryer (1) according to claim 6, characterised by the fact that the internal housing (2b) comprises at least one additional portion consisting of a proximal portion (22) around the propeller (7).
  8. Hairdryer (1) according to claim 6 or 7, characterised by the fact that it comprises two annular insulation devices (201, 202) around the distal portion (20).
  9. Hairdryer (1) according to one of claims 6 to 8, characterised by the fact that it comprises two annular insulation devices (204-205) around the central portion (21).
  10. Hairdryer (1) according to one of claims 7 to 9, characterised by the fact that it comprises an annular insulation device (206) around the proximal portion (22).
  11. Hairdryer (1) according to one of the preceding claims, characterised by the fact that said annular insulation devices (201-206) have different diameters.
  12. Hairdryer (1) according to one of the preceding claims, characterised by the fact that said annular insulation devices (201-206) have decreasing diameters in the direction of the circulation of the air between the inlet region and the outlet region.
  13. Hairdryer (1) according to one of the preceding claims, characterised by the fact that said annular insulation devices (201-206) consist of O-ring seals.
  14. Hairdryer (1) according to claim 13, characterised by the fact that the seals (201-206) are mounted in grooves (G) that the external and internal housings (2a, 2b) have, these grooves (G) being conformed to allow the seals to be moved in the gorge and to expand.
EP21180149.3A 2020-06-19 2021-06-17 Hair dryer with external and internal housings separated by annular insulation devices Active EP3925481B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2006463A FR3111526B1 (en) 2020-06-19 2020-06-19 Hair dryer comprising external and internal boxes separated by annular insulation devices.

Publications (2)

Publication Number Publication Date
EP3925481A1 EP3925481A1 (en) 2021-12-22
EP3925481B1 true EP3925481B1 (en) 2022-11-30

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EP21180149.3A Active EP3925481B1 (en) 2020-06-19 2021-06-17 Hair dryer with external and internal housings separated by annular insulation devices

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EP (1) EP3925481B1 (en)
CN (1) CN113812743A (en)
ES (1) ES2938797T3 (en)
FR (1) FR3111526B1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100064542A1 (en) * 2008-09-15 2010-03-18 Hamilton Beach Brands, Inc. Hair drying apparatus
FR3039377B1 (en) 2015-07-28 2017-09-01 Seb Sa HAIR DRYER WITH COANDA EFFECT AIR OUTPUT DUCT
CN107912855A (en) * 2018-01-08 2018-04-17 江苏华频电子科技有限公司 A kind of super-silent hair-dryer

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Publication number Publication date
ES2938797T3 (en) 2023-04-14
CN113812743A (en) 2021-12-21
EP3925481A1 (en) 2021-12-22
FR3111526A1 (en) 2021-12-24
FR3111526B1 (en) 2022-06-24

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