EP1692962A1 - Hair dryer with improved acoustic confort - Google Patents
Hair dryer with improved acoustic confort Download PDFInfo
- Publication number
- EP1692962A1 EP1692962A1 EP05447037A EP05447037A EP1692962A1 EP 1692962 A1 EP1692962 A1 EP 1692962A1 EP 05447037 A EP05447037 A EP 05447037A EP 05447037 A EP05447037 A EP 05447037A EP 1692962 A1 EP1692962 A1 EP 1692962A1
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- European Patent Office
- Prior art keywords
- hair dryer
- blades
- dryer according
- dynamic equilibrium
- maintained
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 abstract 1
- 230000005484 gravity Effects 0.000 description 3
- 206010011878 Deafness Diseases 0.000 description 2
- 231100000895 deafness Toxicity 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000016354 hearing loss disease Diseases 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 210000003454 tympanic membrane Anatomy 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/662—Balancing of rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
Definitions
- the present invention relates to hair dryers and in particular hair dryers with improved sound performances in the field of the resonant frequency of the ear.
- the perception of a noise and in particular of a noise nuisance due to a hair dryer is relatively subjective but there are however frequencies considered as being particularly unpleasant by many users.
- GB-A-2 156 007 discloses an axial turbine with a particular configuration of its blades showing an attempt to improve the flow of air over the heating element by reducing turbulence.
- the geometry of this axial turbine is relatively complex and therefore expensive.
- US-A-60/11903 also discloses a silent hair dryer with multiple axial turbines; its construction is very complex.
- a radial turbine To meet the geometric constraints of some current hair dryers, the inventor has used a radial turbine. These radial turbines have been the subject of many studies to try to make them quieter especially for industrial uses on steam turbines as well as as cooling turbines for pumps and motors.
- the essential characteristic of such a radial turbine lies in the fact that the shape of the blades and their spacing relative to each other is variable while maintaining the center of gravity in the middle of the turbine to avoid unbalance. It is said that the turbine is in dynamic equilibrium.
- British patent GB-A-2,046,360 also discloses a radial turbine with a variable spacing between the blades.
- the present invention aims to provide a hair dryer with a radial turbine in dynamic equilibrium, on which the blades have a variable angular spacing, to reduce the amplitude of the frequencies between 3000 and 5000Hz and in particular around 4000Hz.
- the present invention discloses an improved acoustic comfort hair dryer having a heating resistor, a motor and a radial turbine provided with a plurality of blades in dynamic equilibrium, rotating about a central axis, said vanes extending in a plane perpendicular to said axis and forming an angular spacing therebetween, characterized in that said vanes are arranged irregularly and in that at least two adjacent vanes form an angular spacing different from the other adjacent vanes.
- Figure 1 shows the various turbine models A, B and C that have been tested by the inventor.
- Figure 2 shows the redistribution of frequencies around 4KHz to low frequencies. This effect is obtained with model A.
- Figure 3 shows the increase in low frequencies obtained by model B.
- Figure 4 shows the increase in high frequencies obtained with the C model.
- Figure 5 shows the exacerbated sensitivity of the human ear to sounds around 4KHz.
- Figure 6 shows a detailed drawing of 3 versions of the radial turbine according to the model A, B and D (only one angle different from the others) or the dynamic equilibrium is obtained by the arrangement of the blades.
- model A To try to reduce the amplitude of the frequency range between 3000 and 5000 Hz, the inventor used two types of radial turbines (Model A and Model B) and a type of axial turbine (Model C).
- Model A and model B lies in the fact that, in model A, only the distribution of the angles between the different vanes was changed while maintaining the center of gravity in the middle of the radial turbine (dynamic equilibrium) while, on the B model, the thickness of the blades was also modified while of course keeping the center of gravity on the axis of said radial turbine.
- Model C produces a larger air flow but nevertheless produces a higher amplitude in the high frequencies.
- the following table shows the number of revolutions per minute and the flow rate of the different models A, B and C compared to an original model.
- Figures 3, 4 and 5 show the performances of the different models with regard to the number of decibels and the frequencies.
- These different figures concerning the models A, B and C show that the model A reduces the frequencies around 4KHz, which was the desired effect because this frequency corresponds to the resonance frequency of the eardrum and is perceived from more importantly for the same sound level (dB). This reduction therefore leads to an improvement in acoustic comfort despite the increase in amplitude of the low frequencies resulting in a higher noise level. important. It is also noted that performance on the bit rate is also increased (throughput / RPM).
- Model B uses a radial turbine with different angular spacings but where the blade thickness has also been modified while maintaining dynamic equilibrium. In this case, we see in Figure 3 that the high frequencies retain the same sound level while the low frequencies are amplified; this model does not meet the expectations of the invention.
- Model C uses an axial turbine which is more efficient in terms of flow; it slightly increases the air pressure at the outlet of the hair dryer but it also increases the amplitude of the high frequencies, which is also contrary to the aim pursued by the invention.
- the following table summarizes the performance of the various turbine models.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning And Drying Hair (AREA)
Abstract
Description
La présente invention se rapporte aux sèche-cheveux et en particulier aux sèche-cheveux à performances sonores améliorées dans le domaine de la fréquence de résonance de l'oreille.The present invention relates to hair dryers and in particular hair dryers with improved sound performances in the field of the resonant frequency of the ear.
La perception d'un bruit et en particulier d'une nuisance sonore due à un sèche-cheveux est relativement subjective mais il existe cependant des fréquences considérées comme étant particulièrement désagréables par de nombreux utilisateurs.The perception of a noise and in particular of a noise nuisance due to a hair dryer is relatively subjective but there are however frequencies considered as being particularly unpleasant by many users.
Davis et Silverman (1978 dans « Hearing and Deafness » ont publié une série de tests concernant la sensibilité de l'oreille humaine à des sons purs [Davis H. & Silverman SR, 1978 « Hearing and Deafness, Ed. Hold Reinhardt and Winston, New-York]. Les tests effectués par Davis et Silverman ont montré que l'oreille était particulièrement sensible à des fréquences aux alentours de 4KHz, ce qui correspond à peu près à la note la plus aiguë d'un piano. Cette fréquence correspond aussi à la fréquence de résonance du tympan de l'oreille, ce qui la rend très sensible à ces sons.Davis and Silverman (1978 in "Hearing and Deafness" have published a series of tests concerning the sensitivity of the human ear to pure sounds [Davis H. & Silverman SR, 1978] "Hearing and Deafness, Ed. Hold Reinhardt and Winston, New York] Tests by Davis and Silverman have shown that the ear is particularly sensitive to frequencies around 4KHz, which is about the highest pitch of a piano. at the resonance frequency of the eardrum, which makes it very sensitive to these sounds.
Pour augmenter la performance sonore d'un sèche-cheveux, il ne suffit donc pas simplement de diminuer l'amplitude sonore mais il est beaucoup plus efficace en termes de confort d'essayer de diminuer l'amplitude des fréquences se situant aux alentours de 4KHz, même si cela va au détriment de l'amplitude mesurée dans les basses fréquences.To increase the sound performance of a hair dryer, it is not enough to simply reduce the amplitude of sound but it is much more effective in terms of comfort to try to reduce the amplitude of the frequencies of around 4KHz , even if that goes to the detriment of the amplitude measured in the low frequencies.
Différentes tentatives d'amélioration des performances sonores des sèche-cheveux ont été faites dans le passé en travaillant principalement sur la géométrie des conduits d'air et celle des turbines destinées à souffler l'air à travers ces conduits.Various attempts to improve the sound performance of hair dryers have been made in the past by working mainly on the geometry of the air ducts and the turbines for blowing air through these ducts.
Le document GB-A-2 156 007 divulgue une turbine axiale avec une configuration particulière de ses pales montrant une tentative d'améliorer le flux d'air pardessus l'élément chauffant en réduisant les turbulences. La géométrie de cette turbine axiale est relativement complexe et donc coûteuse.GB-A-2 156 007 discloses an axial turbine with a particular configuration of its blades showing an attempt to improve the flow of air over the heating element by reducing turbulence. The geometry of this axial turbine is relatively complex and therefore expensive.
Le document US-A-60/11903 divulgue également un sèche-cheveux silencieux à turbines axiales multiples ; sa construction est très complexe.US-A-60/11903 also discloses a silent hair dryer with multiple axial turbines; its construction is very complex.
Pour répondre aux contraintes géométriques de certains sèche-cheveux actuels, l'inventeur a utilisé une turbine radiale. Ces turbines radiales ont fait l'objet de nombreuses études pour essayer de les rendre plus silencieuses en particulier pour des utilisations industrielles sur des turbines à gaz vapeur ainsi qu'en tant que turbines de refroidissement pour des pompes et des moteurs. La caractéristique essentielle d'une telle turbine radiale réside dans le fait que la forme des pales ainsi que leur écartement les unes par rapport aux autres est variable tout en maintenant le centre de gravité au milieu de la turbine pour éviter les balourds. On dit que la turbine est en équilibre dynamique.To meet the geometric constraints of some current hair dryers, the inventor has used a radial turbine. These radial turbines have been the subject of many studies to try to make them quieter especially for industrial uses on steam turbines as well as as cooling turbines for pumps and motors. The essential characteristic of such a radial turbine lies in the fact that the shape of the blades and their spacing relative to each other is variable while maintaining the center of gravity in the middle of the turbine to avoid unbalance. It is said that the turbine is in dynamic equilibrium.
Différents angles de disposition des pales ont été étudiés et nous citerons dans ce cadre le document américain US-A-4,253,800 qui élabore une formule mathématique pour essayer d'éviter un certain nombre d'harmoniques.Different angles of arrangement of the blades have been studied and we will quote in this context the US-A-4,253,800 which develops a mathematical formula to try to avoid a number of harmonics.
Par ailleurs, le document US-B-6,491,499 traite également de la réduction du bruit par l'intermédiaire d'une turbine radiale.Moreover, the document US-B-6,491,499 also deals with the reduction of noise by means of a radial turbine.
Le document britannique GB-A-2 046 360 divulgue également une turbine radiale avec un écartement variable entre les aubes.British patent GB-A-2,046,360 also discloses a radial turbine with a variable spacing between the blades.
Tous ces documents s'attachent essentiellement à éviter la formation d'un certain nombre d'harmoniques mais ne visent aucune diminution d'amplitude dans une plage de fréquence particulière. Par ailleurs, aucun de ces documents ne divulgue l'utilisation de ces turbines radiales dans un sèche cheveux.All these documents focus essentially on avoiding the formation of a certain number of harmonics but do not aim at any decrease in amplitude in a particular frequency range. Moreover, none of these documents discloses the use of these radial turbines in a hair dryer.
La présente invention vise à fournir un sèche-cheveux avec une turbine radiale en équilibre dynamique, sur laquelle les aubes ont un écartement angulaire variable, permettant de diminuer l'amplitude des fréquences entre 3000 et 5000Hz et en particulier aux alentours de 4000Hz.The present invention aims to provide a hair dryer with a radial turbine in dynamic equilibrium, on which the blades have a variable angular spacing, to reduce the amplitude of the frequencies between 3000 and 5000Hz and in particular around 4000Hz.
La présente invention divulgue un sèche-cheveux à confort acoustique amélioré comportant une résistance chauffante, un moteur et une turbine radiale munie d'une pluralité d'aubes en équilibre dynamique, tournant autour d'un axe central, lesdites aubes s'étendant dans un plan perpendiculaire audit axe et formant un espacement angulaire entre elles, caractérisé en ce que lesdites aubes sont arrangées de manière irrégulière et en ce que deux aubes adjacentes au moins forment un espacement angulaire différent des autres aubes adjacentes.The present invention discloses an improved acoustic comfort hair dryer having a heating resistor, a motor and a radial turbine provided with a plurality of blades in dynamic equilibrium, rotating about a central axis, said vanes extending in a plane perpendicular to said axis and forming an angular spacing therebetween, characterized in that said vanes are arranged irregularly and in that at least two adjacent vanes form an angular spacing different from the other adjacent vanes.
Selon des formes particulières de réalisation, l'invention comporte l'une ou plusieurs des caractéristiques suivantes .
- l'équilibre dynamique est maintenu en modifiant le positionnement d'au moins deux aubes,
- l'équilibre dynamique est maintenu en modifiant l'épaisseur d'au moins une aube,
- l'équilibre dynamique est maintenu en modifiant à la fois le positionnement d'au moins deux aubes et l'épaisseur d'au moins une aube,
- toutes les aubes adjacentes ont un espacement angulaire différent,
- l'angle formé par les espacements angulaires correspond à un nombre premier,
- les angles formés par les espacements angulaires sont respectivement de 19°, 23°, 29°, 31°, 37° et 41°,
- les angles formés par les espacements angulaires sont respectivement de 23°, 29°, 31°, 37°, 41°, 43°, 47° et 53°.
- the dynamic equilibrium is maintained by modifying the positioning of at least two vanes,
- the dynamic equilibrium is maintained by modifying the thickness of at least one blade,
- the dynamic equilibrium is maintained by modifying both the positioning of at least two blades and the thickness of at least one blade,
- all adjacent vanes have different angular spacing,
- the angle formed by the angular spacings corresponds to a prime number,
- the angles formed by the angular spacings are respectively 19 °, 23 °, 29 °, 31 °, 37 ° and 41 °,
- the angles formed by the angular spacings are respectively 23 °, 29 °, 31 °, 37 °, 41 °, 43 °, 47 ° and 53 °.
La figure 1 représente les différents modèles de turbine A, B et C qui ont été testés par l'inventeur.Figure 1 shows the various turbine models A, B and C that have been tested by the inventor.
La figure 2 représente la redistribution des fréquences aux alentours de 4KHz vers les basses fréquences. Cet effet étant obtenue avec le modèle A.Figure 2 shows the redistribution of frequencies around 4KHz to low frequencies. This effect is obtained with model A.
La figure 3 représente l'augmentation des basses fréquences obtenue par le modèle B.Figure 3 shows the increase in low frequencies obtained by model B.
La figure 4 représente l'augmentation des hautes fréquences obtenue avec le modèle C.Figure 4 shows the increase in high frequencies obtained with the C model.
La figure 5 représente la sensibilité exacerbée de l'oreille humaine aux sons aux alentours de 4KHz.Figure 5 shows the exacerbated sensitivity of the human ear to sounds around 4KHz.
La figure 6 représente un dessin détaillé de 3 versions de la turbine radiale selon le modèle A, B et D (un seul angle différent des autres) ou l'équilibre dynamique est obtenu par l'agencement des aubes.Figure 6 shows a detailed drawing of 3 versions of the radial turbine according to the model A, B and D (only one angle different from the others) or the dynamic equilibrium is obtained by the arrangement of the blades.
Pour essayer de diminuer l'amplitude de la plage de fréquences entre 3000 et 5000Hz, l'inventeur a eu recours à deux types de turbines radiales (modèle A et modèle B) et un type de turbine axiale (modèle C). La différence entre le modèle A et le modèle B réside dans le fait que, sur le modèle A, on a uniquement modifié la distribution des angles entre les différentes aubes tout en maintenant le centre de gravité au milieu de la turbine radiale (équilibre dynamique) alors que, sur le modèle B, on a également modifié l'épaisseur des pales tout en maintenant bien entendu le centre de gravité sur l'axe de ladite turbine radiale. Le modèle C produit un flux d'air plus important mais produit néanmoins une amplitude sonore plus élevée dans les hautes fréquences. Le tableau suivant représente le nombre de tours/minute ainsi que le débit des différents modèles A, B et C par rapport à un modèle original.To try to reduce the amplitude of the frequency range between 3000 and 5000 Hz, the inventor used two types of radial turbines (Model A and Model B) and a type of axial turbine (Model C). The difference between model A and model B lies in the fact that, in model A, only the distribution of the angles between the different vanes was changed while maintaining the center of gravity in the middle of the radial turbine (dynamic equilibrium) while, on the B model, the thickness of the blades was also modified while of course keeping the center of gravity on the axis of said radial turbine. Model C produces a larger air flow but nevertheless produces a higher amplitude in the high frequencies. The following table shows the number of revolutions per minute and the flow rate of the different models A, B and C compared to an original model.
Les figures 3, 4 et 5 montrent les performances des différents modèles en ce qui concerne le nombre de décibels et les fréquences. Ces différentes figures concernant les modèles A, B et C montrent que le modèle A réduit les fréquences aux alentours de 4KHz, ce qui était l'effet souhaité car cette fréquence correspond à la fréquence de résonance du tympan de l'oreille et est perçue de manière plus importante pour un même niveau sonore (dB). Cette réduction entraîne donc une amélioration du confort acoustique malgré l'augmentation d'amplitude des basses fréquences entraînant un niveau sonore plus important. On constate également que les performances sur le débit sont également accrues (débit/RPM).Figures 3, 4 and 5 show the performances of the different models with regard to the number of decibels and the frequencies. These different figures concerning the models A, B and C show that the model A reduces the frequencies around 4KHz, which was the desired effect because this frequency corresponds to the resonance frequency of the eardrum and is perceived from more importantly for the same sound level (dB). This reduction therefore leads to an improvement in acoustic comfort despite the increase in amplitude of the low frequencies resulting in a higher noise level. important. It is also noted that performance on the bit rate is also increased (throughput / RPM).
Le modèle B utilise une turbine radiale dont l'ensemble des espacements angulaires sont différents mais où on a également modifié l'épaisseur des aubes tout en maintenant l'équilibre dynamique. Dans ce cas, on voit sur la figure 3 que les hautes fréquences conservent le même niveau sonore alors que les basses fréquences sont amplifiées ; ce modèle ne répond donc pas aux attentes de l'invention.Model B uses a radial turbine with different angular spacings but where the blade thickness has also been modified while maintaining dynamic equilibrium. In this case, we see in Figure 3 that the high frequencies retain the same sound level while the low frequencies are amplified; this model does not meet the expectations of the invention.
Le modèle C utilise une turbine axiale qui est plus performante en termes de débit ; elle augmente légèrement la pression d'air à la sortie du sèche-cheveux mais elle augmente également l'amplitude des hautes fréquences, ce qui est également contraire au but poursuivi par l'invention.
Le tableau suivant résume les performances des différents modèles de turbine.
The following table summarizes the performance of the various turbine models.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05447037A EP1692962A1 (en) | 2005-02-18 | 2005-02-18 | Hair dryer with improved acoustic confort |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05447037A EP1692962A1 (en) | 2005-02-18 | 2005-02-18 | Hair dryer with improved acoustic confort |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1692962A1 true EP1692962A1 (en) | 2006-08-23 |
Family
ID=34943260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05447037A Withdrawn EP1692962A1 (en) | 2005-02-18 | 2005-02-18 | Hair dryer with improved acoustic confort |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1692962A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2967490A1 (en) * | 2010-11-15 | 2012-05-18 | Seb Sa | METHOD FOR MEASURING THE NOISE OF A HAIR DRYER |
| US20180252237A1 (en) * | 2017-03-01 | 2018-09-06 | Cooler Master Co., Ltd. | Impeller |
| CN110985412A (en) * | 2019-11-14 | 2020-04-10 | 中国航天空气动力技术研究院 | Low-noise multi-wing centrifugal fan based on asymmetric impeller |
| EP3246577B1 (en) * | 2015-01-16 | 2021-03-10 | Mitsubishi Electric Corporation | Fan and air conditioner using same |
| CN113048086A (en) * | 2021-03-18 | 2021-06-29 | 江苏大学 | Low-noise unequal distance heart fan optimization design method based on radial basis function neural network model |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2046360A (en) | 1979-03-31 | 1980-11-12 | Aes Plastics Ltd | Fluid impeller |
| US4253800A (en) | 1978-08-12 | 1981-03-03 | Hitachi, Ltd. | Wheel or rotor with a plurality of blades |
| GB2156007A (en) | 1984-02-15 | 1985-10-02 | Fernhurst Limited | Noise reducing blade/stator assembly |
| US6011903A (en) | 1997-04-25 | 2000-01-04 | Soundesign, L.L.C. | Reduced-noise ducted flow hair dryer with multiple impellers and ambient air inlets |
| US6491499B1 (en) | 2000-09-27 | 2002-12-10 | Torrington Research Company | Axial flow fan |
| JP2003093138A (en) * | 2001-09-25 | 2003-04-02 | Matsushita Electric Works Ltd | Hair dryer |
-
2005
- 2005-02-18 EP EP05447037A patent/EP1692962A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253800A (en) | 1978-08-12 | 1981-03-03 | Hitachi, Ltd. | Wheel or rotor with a plurality of blades |
| GB2046360A (en) | 1979-03-31 | 1980-11-12 | Aes Plastics Ltd | Fluid impeller |
| GB2156007A (en) | 1984-02-15 | 1985-10-02 | Fernhurst Limited | Noise reducing blade/stator assembly |
| US6011903A (en) | 1997-04-25 | 2000-01-04 | Soundesign, L.L.C. | Reduced-noise ducted flow hair dryer with multiple impellers and ambient air inlets |
| US6491499B1 (en) | 2000-09-27 | 2002-12-10 | Torrington Research Company | Axial flow fan |
| JP2003093138A (en) * | 2001-09-25 | 2003-04-02 | Matsushita Electric Works Ltd | Hair dryer |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 2003, no. 08 6 August 2003 (2003-08-06) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2967490A1 (en) * | 2010-11-15 | 2012-05-18 | Seb Sa | METHOD FOR MEASURING THE NOISE OF A HAIR DRYER |
| WO2012066224A1 (en) * | 2010-11-15 | 2012-05-24 | Seb S.A. | Method of measuring the noise of a hairdryer |
| CN103210288A (en) * | 2010-11-15 | 2013-07-17 | Seb公司 | Method of measuring the noise of a hairdryer |
| CN103210288B (en) * | 2010-11-15 | 2014-10-15 | Seb公司 | Method of measuring the noise of a hairdryer |
| EP3246577B1 (en) * | 2015-01-16 | 2021-03-10 | Mitsubishi Electric Corporation | Fan and air conditioner using same |
| US20180252237A1 (en) * | 2017-03-01 | 2018-09-06 | Cooler Master Co., Ltd. | Impeller |
| CN110985412A (en) * | 2019-11-14 | 2020-04-10 | 中国航天空气动力技术研究院 | Low-noise multi-wing centrifugal fan based on asymmetric impeller |
| CN113048086A (en) * | 2021-03-18 | 2021-06-29 | 江苏大学 | Low-noise unequal distance heart fan optimization design method based on radial basis function neural network model |
| CN113048086B (en) * | 2021-03-18 | 2022-05-20 | 江苏大学 | An optimal design method for low-noise unequal-distance centrifugal fans based on radial basis neural network model |
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