EP3958707A1 - Hairdryer - Google Patents
HairdryerInfo
- Publication number
- EP3958707A1 EP3958707A1 EP20728188.2A EP20728188A EP3958707A1 EP 3958707 A1 EP3958707 A1 EP 3958707A1 EP 20728188 A EP20728188 A EP 20728188A EP 3958707 A1 EP3958707 A1 EP 3958707A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casing
- hairdryer
- fan
- brushes
- commutator
- 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.)
- Granted
Links
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 229910002804 graphite Inorganic materials 0.000 claims description 11
- 239000010439 graphite Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 239000003570 air Substances 0.000 description 17
- 229910052799 carbon Inorganic materials 0.000 description 8
- 230000000750 progressive effect Effects 0.000 description 5
- 238000005485 electric heating Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 206010019049 Hair texture abnormal Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 210000000748 cardiovascular system Anatomy 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
Definitions
- the present invention relates to hairdryer devices and in particular refers to a portable hairdryer provided with a commutator electric motor.
- the known and widely used portable hairdryers on the market, intended for both professional and domestic use, are electrical devices equipped with an external casing commonly made of plastics provided with a handle and an air duct.
- an electric motor a centrifugal or axial fan connected and rotated by the electric motor and one or more electric heating elements, in particular resistors or electric resistances, for heating the air are housed inside the hairdryer casing.
- the fan When the hairdryer is in use, i.e. when the electric motor is powered and an electric current passes through the electric heating resistances, the fan is rotated by the electric motor and generates inside the casing, more precisely in the air duct, an air flow which is sucked into the rear part of the hairdryer through a suction opening, flows towards the front part of the hairdryer and outflows from a delivery front opening or mouth.
- the airflow passes through the electric heating resistances which produce heat by Joule effect with the passage of current, thus the airflow heats up and outflows from the delivery mouth.
- the hairdryer electric motor is generally of the commutator type, and comprises a stator integral with the casing and equipped with stator windings powered with direct or single phase alternating electric current, a rotor equipped with rotor or armature windings and rotatably positioned inside the stator and in axis therewith and a commutator or switch fixed to the rotor and engaged by a couple of brushes for supplying the rotor windings with direct or single-phase alternating electric current during the rotation of the rotor for the generation of the magnetic fields necessary for the operation of the motor.
- the rotor and stator are made of ferromagnetic material and the greater the power required to operate the fan to generate an airflow adapted to dry hair in a reasonably short time, the larger the dimensions.
- the brushes are fixed and therefore slide on the commutator which rotates with the rotor and is formed by a plurality of overlapping copper strips.
- the brushes are typically made up of elongated elements, having cylindrical or prismatic shape, made of carbon or graphite - and, for this reason, commonly called "carbon brushes" - i.e. a material that ensures excellent electrical conductivity and a reduced coefficient of friction at the same time.
- the brushes are subject to progressive consumption or wear which takes the form of the generation of carbon or graphite fine powders that diffuses and spreads in the air during the operation of the hairdryer, causing the pollution of the surrounding environment.
- Air pollution or contamination with carbon/graphite fine powders is all the more serious for professional operators and users, typically hairdressers, who are exposed to a polluted environment for the entire working day, with serious health risks in the medium and long term.
- An object of the present invention is to improve the known portable hairdryers, in particular hairdryers provided with commutator electric motors provided with supplying and switching brushes made of carbon or graphite.
- Another object is to provide a hairdryer which allows considerably reducing the emission and diffusion of carbon/graphite powders in the ambient air, generated by the consumption of the brushes during the operation of the hairdryer.
- a further object is to provide a manageable and low weight hairdryer, having a simple and robust construction.
- figure 1 is a rear view of the portable hairdryer according to the invention
- figure 2 is a section according to line II- II of figure 1, which illustrates in particular an electric motor with commutator and supply brushes, a fan and filtering means interposed between the fan and the supply brushes;
- figure 3 is a section according to line III-III of figure 2;
- figure 4 is a section similar to that of figure 2 which illustrates a variant of the hairdryer of the invention equipped with an electrostatic charge generator.
- a hairdryer 1 which comprises an electric motor 2 which includes a stator 21, in particular provided with stator windings 23 powerable by electric current, a rotor 22 provided with rotor windings 24 and rotating inside the stator 2 around a main axis X, a commutator 4 or electric switch fixed to, and rotating with, the rotor 22 and electrically connected to the rotor windings 24 and a couple of brushes 5.
- the latter ones are powerable by electric current and arranged to abut the commutator 4 with a defined force so as to reverse an electrical supply of the rotor windings 24 to create the magnetic fields necessary for the operation of the motor.
- the hairdryer 1 also comprises at least one fan 6 interposed between the electric motor 2 and an air suction rear opening 31 of the hairdryer 1 and rotated about the main axis X by the electric motor 2 so as to generate at least one main airflow F directed to an air outflow front opening 32 of the hairdryer 1.
- the fan 6 is connected to the electric motor 2, in particular to the rotor 22, via a driving shaft 7 and is located upstream of the electric motor 2 with reference to a flow direction of the main airflow F.
- the fan 6, of the centrifugal or axial type and made for example of plastics, comprises a hub 26 connected to one end of the driving shaft 7 and from which a plurality of blades 28 departs.
- the hairdryer 1 further comprises filtering means 8 interposed between the fan 6 and the aforementioned commutator 4 and brushes 5 and arranged to collect powders and/or scraps of a material with which the aforementioned brushes 5 are made, such powders, particles, scraps being generated during operation by the progressive consumption of the brushes 5 placed abutting, and therefore sliding on, the rotating commutator 4.
- the brushes 5 are made of conductive electrical material with a low coefficient of friction, such as for example graphite, carbon powder, mixture of graphite and copper.
- the filtering means 8 comprise a first casing 9, interposed between the fan 6 and the aforementioned commutator 4 and brushes 5, defining a first chamber 11, in particular of an annular shape, which extends around the driving shaft 7 and is adapted to receive and contain a filtering element 10 capable of retaining the powders and/or scraps of the brushes 5 material.
- the filtering element 10 is made of a material, for example non-woven fabric, of a known type.
- the volume of the first chamber 11 and of the filtering element 10 that fills it is such as to allow the effective collection of the entire quantity of powders and scraps generated by the consumption of the two brushes 5.
- the first casing 9 comprises at least a first passage opening 12 facing the commutator 4 which allows the entry of the powders and/or scraps of the brushes 5 material into the first chamber 11.
- a second casing 15 is provided around the commutator 4, connected to the first casing 9 and comprising a second chamber 16 which contains, and in particular completely encloses, the commutator 4 and at least first ends 5a of the brushes 5 which abut the commutator 4.
- the second chamber 16 encloses the space or volume around the commutator 4 in which the powders and/or scraps of material are generated by the progressive consumption of the brushes 5.
- the second chamber 16 is connected to the first chamber 11 through the first passage opening 12 to allow the powders and/or scraps of material to move into the first chamber 11 and be stably held by the filtering element 10.
- the first casing 9 further comprises at least a second passage opening 13 facing the fan 6 and the second casing 15 comprises at least a third passage opening 17 facing the stator 21.
- the first passage opening 12, the second passage opening 13 and the third passage opening 17 allow the passage of a secondary airflow A having an direction opposite the main airflow F, entering the second casing 15 (from the third passage opening 17) and leaving the first casing 9 (from the second passage opening 13), passing through the second chamber 16 and the first chamber 11, through the first passage opening 12, so as to convey and direct the powders and/or scraps of material generated at the commutator 4 into the filtering element 10.
- the hub 26 of the fan 6 is provided with a plurality of through axial holes 27 which connect the second passage opening 13 of the first casing 9 to an air suction area B interposed between the fan 6 and the suction rear opening 31 of the hairdryer 1 to allow the passage and the outflow of the secondary airflow A from the filtering means 8.
- a localized negative pressure of air is generated which facilitates the exit of the secondary airflow A from the through axial holes 27 and more generally the passage of said airflow A through the second chamber 16 and the first chamber 11.
- Containment means 18 are provided for slidingly housing the brushes 5, each of which having an elongated shape and provided with the first end 5a which abuts the commutator 4 and a second end 5b which is opposite the first end 5a and abutted by an elastic element 19 capable of exerting a force or thrust for maintaining the first end 5a against the commutator 4, in particular when a length of the aforementioned brush 5 decreases due to wear.
- the containment means comprise a couple of substantially opposite containment elements 18 connected to the second casing 15 and provided with respective elongated seats arranged to slidingly house the respective brushes 5 and opening into the second chamber 16.
- the hairdryer 1 of the invention also comprises an external casing 3, for example made of plastics, equipped with a handle not shown and with an internal air duct 33 provided with the suction rear opening 31 and the outflow front opening 32, the aforesaid openings 31, 32 being located at the opposite ends of the same air duct 33.
- the outer casing 3 is configured and sized to contain the electric motor 2, the fan 6, the filtering means 8 and the heating elements 34, of a known type and not described in detail.
- the first casing 19 of the filtering means 8 and the external casing 3 form an annular passage 20 for the passage of the main airflow F and of the secondary airflow A which passes through the filtering means 8.
- the rotation of the fan 6 driven by the electric motor 2 generates, in addition to a main airflow F inside the air duct 33 from the suction rear opening 31 to the outflow front opening 32, also a secondary airflow A through the second casing 15 and the first casing 9 and in particular from the second chamber 16, which surrounds and encloses the commutator
- the powders and/or scraps of material are conveyed through the first passage opening 12 into the filtering element 10 where they remain trapped.
- the air leaving the first casing 9 through the second passage opening 13 and the through axial holes 27 of the hub 26 of the fan 6 is therefore filtered, i.e. free of powders and scraps of carbon, graphite, and the like that can disperse in the surrounding environment, and in particular in the place of use of the hairdryer 1.
- the dimensions and volume of the first chamber 11 and of the filtering element 10 ensure the complete and effective collection of the entire quantity of powders and scraps generated by the complete consumption of the two brushes 5.
- the hairdryer 1 of the invention it is thus possible to considerably reduce and substantially eliminate the emission and diffusion into the ambient air of powders, particles and scraps of material, such as carbon/graphite, generated by the consumption of the brushes
- first casing 9 of the filtering means 8 which contains the filtering element 10, of the second casing 15, which encloses and contains the commutator 4 and the first ends 5a of the brushes 5, and of the secondary airflow A, which crosses both chambers 11, 16 defined by the aforementioned first and second casings 9, 15, it is in fact possible to effectively and completely collect and convey all the powders, particles and scraps of the brushes 5 material into the filtering element 10 where they are retained, avoiding their dispersion externally, i.e. in the air duct 33 in the main airflow F.
- the filtering means 8 filter only the secondary airflow A and do not intercept and filter the main airflow F, which flows freely in the air duct 33, from the air suction opening 31 to the air outflow opening 32. In this way, a progressive occlusion of the filtering element 10, due to the accumulation of powders and scraps of material inside it, does not interfere with, and in particular does not reduce, the flow rate of the main airflow F generated by the fan 6.
- a variant of the hairdryer 1 of the invention is shown which differs from the embodiment described above and shown in figures 1-2, in that it comprises an electrostatic charge generator 35 connected to, and acting on, the filtering element 10 to cooperate in retaining the powders and/or scraps of the brushes 5 material inside the filtering element 10.
- the electrostatic charge generator 35 is arranged to release positive electric charges inside the filtering element 10, by means of a first emitter cable 36 which passes through the latter.
- the electrostatic charge generator 35 comprises, for example, an ionizer of a known type and not described in detail, arranged to electrically charge the air-forming gas molecules and produce positive ions inside the filtering element 10, in particular by the first emitter cable 36.
- the electrostatic charge generator 35 is also connected with a second emitter cable 37 to the heating elements 34, in particular comprising resistors or electrical resistances, to electrically charge the air-forming gas molecules and produce negative ions at the outflow front opening 32.
Landscapes
- Cleaning And Drying Hair (AREA)
- Cosmetics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102019000006306A IT201900006306A1 (en) | 2019-04-24 | 2019-04-24 | HAIRDRYER |
PCT/IB2020/053814 WO2020217189A1 (en) | 2019-04-24 | 2020-04-22 | Hairdryer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3958707A1 true EP3958707A1 (en) | 2022-03-02 |
EP3958707B1 EP3958707B1 (en) | 2023-06-07 |
EP3958707C0 EP3958707C0 (en) | 2023-06-07 |
Family
ID=67875889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20728188.2A Active EP3958707B1 (en) | 2019-04-24 | 2020-04-22 | Hairdryer |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3958707B1 (en) |
ES (1) | ES2952234T3 (en) |
IT (1) | IT201900006306A1 (en) |
WO (1) | WO2020217189A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3439204A (en) * | 1965-06-23 | 1969-04-15 | Sunbeam Corp | Combination motor-blower unit for hair dryer |
US20040093756A1 (en) * | 2002-11-14 | 2004-05-20 | Conair Cip, Inc. | Filter device for a hair dryer |
KR20050022152A (en) * | 2003-08-30 | 2005-03-07 | 한불전자 주식회사 | Hair dryer |
-
2019
- 2019-04-24 IT IT102019000006306A patent/IT201900006306A1/en unknown
-
2020
- 2020-04-22 EP EP20728188.2A patent/EP3958707B1/en active Active
- 2020-04-22 ES ES20728188T patent/ES2952234T3/en active Active
- 2020-04-22 WO PCT/IB2020/053814 patent/WO2020217189A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP3958707B1 (en) | 2023-06-07 |
IT201900006306A1 (en) | 2020-10-24 |
WO2020217189A1 (en) | 2020-10-29 |
ES2952234T3 (en) | 2023-10-30 |
EP3958707C0 (en) | 2023-06-07 |
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