EP2983450B1 - Heating element, in particular for hair dryer appliances - Google Patents
Heating element, in particular for hair dryer appliances Download PDFInfo
- 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
- 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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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—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/16—Heater 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
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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
-
- 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.
Description
- This invention relates to a heating element, in particular for hair dryer appliances.
- There are already known 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.
- Since the market requires appliances that are ever more compact, easy to handle, lightweight and at the same time more efficient in terms of heating power, 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.
- For example, in a known embodiment, 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. This configuration allows having a high heating wire density and a good mechanical strength, especially during the steps of winding around the support element. However, the heat dissipation is not homogeneous and sufficiently ample space is required in the appliance to allow heat dissipation. Furthermore, fabrication is mostly manual and is difficult in the case of small diameter wires. Finally, 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. In this case, 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. However, these wires are weaker during handling, especially in case of wires of small diameter.
-
DE 91 09 042 U1 discloses 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.
- This purpose is achieved with a heating element according to
claim 1. The dependent claims describe preferred embodiments of the invention. - The characteristics and advantages of the heating element according to the invention will, in any case, be evident from the following description of its preferred embodiments, provided by way of non-limiting example, with reference to the accompanying drawings, wherein:
-
Figure 1 shows, in perspective view, the configuration of the heating wire of a heating element according to the invention; -
Figure 2 is an end view of the heating wire; -
Figure 3 is an axial section of the heating wire; and -
Figure 4 is a plan view of the heating element. - In said drawings,
numeral 1 denotes a heating element according to the invention as a whole. For simplicity, electrical connections and some electrical devices, such as temperature limiters, usually present in a heating element covered by this invention and known per se, have not been shown. - The
heating element 1 comprises at least oneheating wire 10 wound around aninsulating support 50. - The
heating wire 10 is suitable to be crossed by an electric current so as to heat an air flow that hits theheating element 1. - As shown, in particular in
Figures 1 and2 , theheating wire 10 is shaped so as to form acoil 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. - The result of this course of the
heating wire 10 is that the coils 12' of saidcoil spring 12 are "eight" shaped. In other words, as shown inFigure 2 , when seen from the front, each coil 12 'is not circular but is formed by two intertwined circular elements. - In the example shown, 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. - Furthermore, in an embodiment, these virtual cylinders have an elliptical, rather than circular, cross-section.
- Turning now to the
insulating support 50, in a preferred embodiment, saidsupport 50 has an axially symmetrical structure that extends along a main support axis Y. For example, thesupport 50 has a cylindrical or conical structure or has a cylindrical or conical envelope. - In a preferred embodiment, the
support 50 comprises two ormore support plates 52 cross with each other along said main support axis Y. Along the edges of eachsupport plate 52 there are provided seats 54 for housing theheating wire 10. - In a preferred embodiment, the
heating wire 10 is wound on theinsulating 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. In other words, the axes of the virtual cylinders around which theheating wire 10 is wound lie on a plane orthogonal to the main support axis Y. - In an embodiment (not shown in the drawings), the
heating wire 10 forms at least two coplanar coils around theinsulating support 50. - In a variant embodiment, the
heating element 1 comprises at least twoheating wires 10 wrapped around the sameinsulating support 50.Such heating wires 10 can be connected together in series or in parallel. Of course, thedifferent heating wires 10 can have different diameters and/or different shapes or sizes of the "eight" shaped coils 12'. - For example, the
heating wires 10 form respective coaxial windings and, in a particular embodiment, such windings have coplanar coils. In this way, with the same extension of theinsulating support 50 along the main support axis Y, the density of the heating wire is substantially double with respect to a single winding. - The configuration of the heating element described above allows achieving the intended purposes.
- The "eight" shape of the coils 12' of the heating wire allows greatly increasing the density of the wire in the space. In addition, 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.
- Therefore, it is possible to increase the heating power of the appliance in the same space occupied by the heating element or, for the same power dissipated, significantly reduce the overall dimensions and therefore the weight of the appliance, increasing its manoeuvrability.
- 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.
- Finally, 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.
- To the embodiments of the heating element according to the invention, a man skilled in the art, to satisfy contingent requirements, may make modifications, adaptations and replacements of elements with others functionally equivalent, without departing from the scope of the following claims. Each of the characteristics described as belonging to a possible embodiment can be achieved independently from the other embodiments described.
Claims (13)
- Heating element, in particular for hair dryer appliances, comprising at least one heating wire (1) suitable to be flowed through by an electric current, wherein said heating wire 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, the heating element further comprising an insulating support (50), the heating element being characterised in that said at least one heating wire is wound on the insulating support.
- Heating element according to claim 1, wherein each coil (12') of said coil spring is shaped as an "eight".
- Heating element according to claim 1 or 2, wherein said cylinders have different diameters.
- Heating element according to any one of the previous claims, wherein said cylinders have an elliptical cross section.
- Heating element according to anyone of the previous claims, wherein said support has an axially symmetrical structure that extends along a main support axis (Y).
- Heating element according to the previous claim, wherein each coil of the heating wire extends mainly in a direction perpendicular to said main support axis.
- Heating element according to claim 5 or 6, wherein said insulating support is formed of two or more support plates (52) crossing each other on said main support axis (Y), housing seats (54) of the heating wire (10) being made along the edges of each support plate.
- Heating element according to any of the claims 5-7, wherein said support has a cylindrical or conical shape or envelope.
- Heating element according to any of the previous claims, wherein the heating wire forms at least two coplanar coils around the insulating support.
- Heating element according to any of the previous claims, comprising at least two heating wires wound around a single insulating support.
- Heating element according to the previous claim, wherein said heating wires form respective coaxial windings.
- Heating element according to the previous claim, wherein said windings have coplanar coils.
- Hair dryer appliance comprising at least one heating element according to any of the previous claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBS20140149 | 2014-08-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2983450A1 EP2983450A1 (en) | 2016-02-10 |
EP2983450B1 true EP2983450B1 (en) | 2017-03-22 |
Family
ID=51904002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15169090.6A Active EP2983450B1 (en) | 2014-08-08 | 2015-05-25 | Heating element, in particular for hair dryer appliances |
Country Status (1)
Country | Link |
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EP (1) | EP2983450B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106108342A (en) * | 2016-08-17 | 2016-11-16 | 台州市黄岩容大美发器具有限公司 | A kind of efficient hair drier |
CN106231703B (en) * | 2016-08-19 | 2023-08-18 | 安徽省宁国市天成电气有限公司 | Heating assembly |
CN106455143A (en) * | 2016-08-27 | 2017-02-22 | 泰州市浩晟电热材料有限公司 | Disc type efficient heating structure |
EP3424363A1 (en) * | 2017-07-06 | 2019-01-09 | Action Technology Indústria E Comércio De Eletroeletrônicos Ltda | Resistive element applied to heating equipment |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH219731A (en) * | 1941-04-19 | 1942-02-28 | Balzer Albert | Hand tool for burning off old paint on wood and masonry or the like, as well as for quick drying of repaired areas before repainting. |
JPS444864Y1 (en) * | 1966-11-29 | 1969-02-21 | ||
DE9109042U1 (en) * | 1991-07-23 | 1992-11-19 | Elektro-Waerme-Technik Siegfried Petz, Inh. Guenter Petz, 8500 Nuernberg, De |
-
2015
- 2015-05-25 EP EP15169090.6A patent/EP2983450B1/en active Active
Non-Patent Citations (1)
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None * |
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EP2983450A1 (en) | 2016-02-10 |
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