EP2983450B1 - Element de chauffage, en particulier pour sèche-cheveux - Google Patents

Element de chauffage, en particulier pour sèche-cheveux Download PDF

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Publication number
EP2983450B1
EP2983450B1 EP15169090.6A EP15169090A EP2983450B1 EP 2983450 B1 EP2983450 B1 EP 2983450B1 EP 15169090 A EP15169090 A EP 15169090A EP 2983450 B1 EP2983450 B1 EP 2983450B1
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EP
European Patent Office
Prior art keywords
heating element
element according
heating
previous
support
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EP15169090.6A
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German (de)
English (en)
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EP2983450A1 (fr
Inventor
Carlo Zanon
Dario Omodei
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Individual
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54

Definitions

  • This invention relates to a heating element, in particular for hair dryer appliances.
  • heating elements for hair dryer appliances and similar equipment, comprising at least one heating wire suitable to act as a conductor for the passage of an electric current and therefore acting as an electrical resistance to heat an air flow that hits such heating wire.
  • the heating wire is wound on an insulating support, usually formed by at least two crossed plates.
  • heating elements have been proposed with particular conformations of the heating wire so as to increase the density of the wire and still allow a good heat dissipation in confined spaces.
  • the heating wire is shaped so as to form a cylindrical coil spring, i.e., formed by substantially circular coils when the wire is viewed from one end.
  • a cylindrical coil spring i.e., formed by substantially circular coils when the wire is viewed from one end.
  • This configuration allows having a high heating wire density and a good mechanical strength, especially during the steps of winding around the support element.
  • the heat dissipation is not homogeneous and sufficiently ample space is required in the appliance to allow heat dissipation.
  • fabrication is mostly manual and is difficult in the case of small diameter wires.
  • the winding shape generates inductive phenomena that can cause the formation of electric arcs in the contacts of the switches.
  • a variant embodiment that proposes to overcome some of these drawbacks includes a corrugated configuration of the heating wire instead of a spring.
  • higher powers can be achieved in more constrained spaces, since the heat dissipation is better.
  • Heating elements wrapped with corrugated wire can be fabricated with a more easily automated process.
  • these wires are weaker during handling, especially in case of wires of small diameter.
  • a heating element in particular for hair drying appliances, comprising at least one heating wire suitable to be flowed through by air electric current, wherein said heating wire is shaped so as to form a coil spring which follows the course of a line wound around two cylinders with parallel main axes, the direction of rotation around one cylinder being opposite to the direction of rotation around the other cylinder, the heater element further comprising an insulating support.
  • the purpose of this invention is to propose an electrical resistance heating element, in particular for hair dryer appliances, that allows realizing highly efficient, compact and manageable appliances while, at the same time, overcoming the drawbacks described above with reference to known heating elements.
  • numeral 1 denotes a heating element according to the invention as a whole.
  • the heating element 1 comprises at least one heating wire 10 wound around an insulating support 50.
  • the heating wire 10 is suitable to be crossed by an electric current so as to heat an air flow that hits the heating element 1.
  • the heating wire 10 is shaped so as to form a coil spring 12 that follows the course of a line wound around two cylinders with parallel main axes X,X', the direction of rotation around one cylinder being opposite to the direction of rotation around the other cylinder.
  • each coil 12 ' of said coil spring 12 is "eight" shaped.
  • each coil 12 ' when seen from the front, each coil 12 'is not circular but is formed by two intertwined circular elements.
  • these circular elements are the same since the two virtual cylinders around which the heating wire 10 is wound have the same diameter. In a variant embodiment, these cylinders have different diameters.
  • these virtual cylinders have an elliptical, rather than circular, cross-section.
  • said support 50 has an axially symmetrical structure that extends along a main support axis Y.
  • the support 50 has a cylindrical or conical structure or has a cylindrical or conical envelope.
  • the support 50 comprises two or more support plates 52 cross with each other along said main support axis Y. Along the edges of each support plate 52 there are provided seats 54 for housing the heating wire 10.
  • the heating wire 10 is wound on the insulating support 50 in such a way that the coils 12' of the heating wire extend in a primarily perpendicular direction to the main support axis Y.
  • the axes of the virtual cylinders around which the heating wire 10 is wound lie on a plane orthogonal to the main support axis Y.
  • the heating wire 10 forms at least two coplanar coils around the insulating support 50.
  • the heating element 1 comprises at least two heating wires 10 wrapped around the same insulating support 50.
  • Such heating wires 10 can be connected together in series or in parallel.
  • the different heating wires 10 can have different diameters and/or different shapes or sizes of the "eight" shaped coils 12'.
  • the heating wires 10 form respective coaxial windings and, in a particular embodiment, such windings have coplanar coils.
  • the density of the heating wire is substantially double with respect to a single winding.
  • the "eight" shape of the coils 12' of the heating wire allows greatly increasing the density of the wire in the space.
  • the flattened shape of the coils themselves in the direction substantially orthogonal to the air flow that hits the heating element, offers a better exposure to the air flow and thus a more effective heat dissipation.
  • the coil-spring shaped heating wire has excellent mechanical strength, since the elasticity offered by the spring shape allows bring the coils back into position even after the manipulation of the wire or of the heating element or after accidental falls of the appliance.
  • the production process of the heating element is easily automated.
  • the higher density of the heating wire allows reducing the dimensions of the insulating support, with consequent reduction of the raw material used for its fabrication.
  • the particular "eight" shape of the coils of the heating wire allows eliminating the inductive effect produced by the current that circulates in the wrapped heating wire, to the advantage of the life of the switches of the appliance, and reducing electromagnetic interference generated by ' appliance.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)

Claims (13)

  1. Élément chauffant, en particulier pour des appareils sèche-cheveux, comprenant au moins un fil chauffant (1) adapté pour être traversé par un courant électrique, dans lequel ledit fil chauffant est conformé de sorte à former un ressort hélicoïdal (12) qui suit la course d'une ligne enroulée autour de deux cylindres avec des axes principaux parallèles (X, X'), la direction de rotation autour d'un cylindre étant en regard de la direction de rotation autour de l'autre cylindre, l'élément chauffant comprenant en outre un support isolant (50), l'élément chauffant étant caractérisé en ce que ledit au moins un fil chauffant est enroulé sur le support isolant.
  2. Élément chauffant selon la revendication 1, dans lequel chaque spire (12') dudit ressort hélicoïdal est conformée comme un « huit ».
  3. Élément chauffant selon la revendication 1 ou 2, dans lequel lesdits cylindres ont différents diamètres.
  4. Élément chauffant selon l'une quelconque des revendications précédentes, dans lequel lesdits cylindres ont une section transversale elliptique.
  5. Élément chauffant selon l'une quelconque des revendications précédentes, dans lequel ledit support a une structure axialement symétrique qui s'étend le long d'un axe de support principal (Y).
  6. Élément chauffant selon la revendication précédente, dans lequel chaque spire du fil chauffant s'étend principalement dans une direction perpendiculaire audit axe de support principal.
  7. Élément chauffant selon la revendication 5 ou 6, dans lequel ledit support isolant est constitué de deux ou plus plaques de support (52) se croisant les unes les autres sur ledit axe de support principal (Y), des sièges de logement (54) du fil chauffant (10) étant réalisés le long des arêtes de chaque plaque de support.
  8. Élément chauffant selon l'une quelconque des revendications 5 à 7, dans lequel ledit support a une forme ou enveloppe cylindrique ou conique.
  9. Élément chauffant selon l'une quelconque des revendications précédentes, dans lequel le film chauffant forme au moins deux spires coplanaires autour du support isolant.
  10. Élément chauffant selon l'une quelconque des revendications précédentes, comprenant au moins deux fils chauffants enroulés autour d'un seul support isolant.
  11. Élément chauffant selon la revendication précédente, dans lequel lesdits fils chauffants forment des enroulements coaxiaux respectifs.
  12. Élément chauffant selon la revendication précédente, dans lequel lesdits enroulements ont des spires coplanaires.
  13. Appareil sèche-cheveux comprenant au moins un élément chauffant selon l'une quelconque des revendications précédentes.
EP15169090.6A 2014-08-08 2015-05-25 Element de chauffage, en particulier pour sèche-cheveux Active EP2983450B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBS20140149 2014-08-08

Publications (2)

Publication Number Publication Date
EP2983450A1 EP2983450A1 (fr) 2016-02-10
EP2983450B1 true EP2983450B1 (fr) 2017-03-22

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EP15169090.6A Active EP2983450B1 (fr) 2014-08-08 2015-05-25 Element de chauffage, en particulier pour sèche-cheveux

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EP (1) EP2983450B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106108342A (zh) * 2016-08-17 2016-11-16 台州市黄岩容大美发器具有限公司 一种高效的电吹风机
CN106231703B (zh) * 2016-08-19 2023-08-18 安徽省宁国市天成电气有限公司 一种加热组件
CN106455143A (zh) * 2016-08-27 2017-02-22 泰州市浩晟电热材料有限公司 一种盘式高效加热结构
EP3424363A1 (fr) * 2017-07-06 2019-01-09 Action Technology Indústria E Comércio De Eletroeletrônicos Ltda Élément résistif appliqué à un équipement de chauffage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH219731A (de) * 1941-04-19 1942-02-28 Balzer Albert Handgerät zum Abbrennen alter Farbe auf Holz- und Mauerwerk oder dergleichen, sowie zum raschen Trocknen von ausgebesserten Stellen vor dem Neuanstrich.
JPS444864Y1 (fr) * 1966-11-29 1969-02-21
DE9109042U1 (fr) * 1991-07-23 1992-11-19 Elektro-Waerme-Technik Siegfried Petz, Inh. Guenter Petz, 8500 Nuernberg, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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EP2983450A1 (fr) 2016-02-10

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