WO2020115677A1 - Heating element for hairdryer - Google Patents

Heating element for hairdryer Download PDF

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Publication number
WO2020115677A1
WO2020115677A1 PCT/IB2019/060438 IB2019060438W WO2020115677A1 WO 2020115677 A1 WO2020115677 A1 WO 2020115677A1 IB 2019060438 W IB2019060438 W IB 2019060438W WO 2020115677 A1 WO2020115677 A1 WO 2020115677A1
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WO
WIPO (PCT)
Prior art keywords
resistive wire
heating element
slot
seat
electric heating
Prior art date
Application number
PCT/IB2019/060438
Other languages
French (fr)
Inventor
Carlos José Ceva
Original Assignee
Ga.Ma S.R.L
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ga.Ma S.R.L filed Critical Ga.Ma S.R.L
Publication of WO2020115677A1 publication Critical patent/WO2020115677A1/en

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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
    • 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
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the present invention relates to portable hairdryer devices, and in particular refers to an electric heating element for heating air in portable hairdryers.
  • the known portable hairdryers intended for both professional and home use, are electrical appliances equipped with an external casing typically made of plastics, provided with a handle and inside which an electric motor, a fan of the centrifugal or axial type, connected to and rotated by the electric motor, and one or more electric heating elements, especially electrical resistors, for air heating, are housed.
  • the fan When the hairdryer is in use, i.e., when the electric motor and the heating element are powered by electric current, the fan is driven in rotation by the electric motor and generates inside the casing, more precisely in an air duct formed therefrom, an air flow which is sucked into the rear part of the hairdryer through a suction aperture, flows into the duct and outflows from a front dispensing aperture of the casing.
  • the air flow passes through the heating element (electrical resistor) which produces heat by Joule effect upon passage of electric current, thereby it heats up and outflows, heated, through the dispensing aperture of the hairdryer.
  • the heating elements for hairdryers are electrical resistors or resistances generally comprised of one or more resistive metal wires wound around a plurality of plates made of an electrical insulating material, e.g., micanite, suitably shaped and arranged radially to each other to form a substantially tubular structure insertable inside the air duct of the hairdryer.
  • the insulating material plates have on their external edges a series of indentations or slots suitable to receive and hold one or more spiral-, helix-, wave-shaped resistive wires, in order to dispose the greatest amount thereof in the least space or volume.
  • the distance or pitch between two adjacent slots must be greater than a defined minimum insulation distance between the resistive and heating wires, which avoids contacts and/or electrical discharges between them in use in compliance with the reference safety standards.
  • the heating power generated by the electrical resistor is proportional to the overall length of the resistive wire(s) supplied by electric current and hit by the air flow.
  • An object of the present invention is to improve the electric heating elements for portable hairdryers, in particular the electrical resistors or resistances made with one or more resistive metal wires wound around plates made of electrical insulating material.
  • Another object is to provide an electric heating element for portable hairdryers having a particularly compact and reduced size, while being capable of generating a high heating power in use, when supplied by electric current.
  • a further object is to provide an electric heating element for portable hairdryers which is simple and inexpensive to produce.
  • Figure 1 is a front view of the electric heating element for hairdryers of the invention
  • Figure 2 is a section according to the plane II-II in Figure 1 ;
  • FIG 3 is a perspective view of the electric heating element for hairdryer in Figure 1 ;
  • Figure 4 is an enlarged view of a detail of the electric heating element in Figure 3;
  • Figure 5 is an enlarged partial view of the electric heating element in Figure 2;
  • Figure 6 is an enlarged partial view of a variant of the electric heating element of the invention.
  • Figure 7 is an enlarged partial view of another variant of the electric heating element of the invention.
  • an electric heating element 1 for hairdryer comprising a plurality of supporting plates 2 made of electrical insulating material, fixed to each other angularly spaced about a longitudinal main axis X and provided on respective external longitudinal edges 3 further away from the main axis X with a plurality of first slots 4 suitable to receive and support at least one first resistive wire 11 wound around the aforementioned supporting plates 2 so as to form a first heating winding 21.
  • Each supporting plate 2 comprises on the respective external longitudinal edge 3 a plurality of respective second slots 5 interposed between the first slots 4 and suitable to receive and support, in addition to the first resistive wire 21, at least one second resistive wire 22 wound around said supporting plates 2 so as to form a second heating winding 22.
  • each second slot 5 is interposed between two first slots 4 that are adjacent along the respective external longitudinal edge 3.
  • Each first slot 4 comprises a respective first seat 14 suitable to receive a portion of the first resistive wire 11; in particular the first seat 14 comprises a bottom portion of the first slot 4 itself.
  • each second slot 5 comprises a second seat 15 and a further second seat 16 which are suitable to receive and support respectively a portion of the first resistive wire 11 and a portion of the second resistive wire 12.
  • the first resistive wire 11 and the second resistive wire 12, in particular made of metal material for electrical resistors or resistances, are suitable to generate heat by Joule effect when supplied by an electric current.
  • the first resistive wire 11 has a cross-section with a first longitudinal dimension bl smaller than a second longitudinal dimension b2 of a second cross-section of the second resistive wire 12; that is, the cross-section of the first resistive wire 11 has a width smaller than that of the cross-section of the second resistive wire 12.
  • the longitudinal dimensions bl, b2, i.e., the widths, are substantially parallel to the longitudinal main axis X.
  • the first slots 4 and the second slots 5 are regularly spaced from each other along the external longitudinal edges 3.
  • the supporting plates 2 e.g., made of micanite or other similar electrical insulating material, have a flat and elongated shape and are fixed to be angularly spaced, substantially radially, about the main axis X so as to form a substantially cylindrical structure.
  • the supporting plates 2 may be shaped so as to form a nearly truncated cone-shaped frame.
  • Each second slot 5 extends inside the respective supporting plate 2 towards the main axis X, in particular nearly orthogonal to the latter.
  • the second seat 15 and the further second seat 16 of the second slot 5 are made almost overlapped and aligned along a direction A that is transverse, in particular substantially orthogonal to the main axis X, as well. More precisely, the second seat 15 comprises a bottom portion of the respective second slot 5 and the further second seat 16 comprises a couple of shoulders facing each other and made on opposite internal walls 5a of the second slot 5, in particular arranged at the external longitudinal edge
  • first resistive wire 11 has a cross-section having a width (first longitudinal dimension bl) smaller than the width (second longitudinal dimension b2) of the cross section of the second resistive wire 12, it can be easily inserted inside the second slot 5 until it abuts against the bottom portion serving as the second seat 14 of the second slot 5.
  • second resistive wire 12 having a section with a greater width, stops when abutting against the shoulders forming the further second seat 16 and cannot penetrate further into the second slot 5.
  • the first resistive wire 11 has, for example, a nearly circular cross-section
  • the second resistive wire 12 has a flat cross-section, in particular rectangular, in order to steadily rest in the respective seats of the slots 4, 5 of the supporting plates 2. More precisely, the circular shape of the first resistive wire 11 allows the latter to be positioned steadily on the bottom portions of the second slots 5 which form the second seats 15 thereof, while the flattened shape of the second resistive wire 12 allows the latter to rest steadily and firmly on the shoulders which form the further second seats 16 of the second slots 5.
  • resistive wires having sections of different shape, e.g., elliptical, the cross-section of the first resistive wire 11 in each case having a width (first longitudinal dimension bl) smaller than the width (second longitudinal dimension b2) of the cross-section of the second resistive wire 12.
  • the slots 4, 5 are made in such a way that a first distance dl between a first slot 4 and a second slot 5 that are adjacent along the external longitudinal edge 3 and a second distance d2 between the second seat 15 and the further second seat 16 of a second slot 5 are greater than a defined minimum insulation distance between resistive wires supplied by electric current, in compliance with the reference safety standards for portable hairdryers.
  • the electric heating element 1 is provided with power cables 8 for connecting the first resistive wire 11 and the second resistive wire 12 to an electric power supply circuit of a hairdryer on which said electric heating element 1 is mounted.
  • the resistive wires 11, 12 are wound as a helix around the supporting plates 2 so as to form the first winding 21 and the second winding 22 and have a wavy course to increase their unwinding length and therefore the heating power which they are able to generate.
  • the electric heating element 1 of the invention having supporting plates 2 which have second slots 5 capable of housing two separate windings, being provided with a further second seat 16 to house the second heating winding 22, allows to considerably increase, by about 20-25%, the generated heating power, while maintaining unchanged the size and the overall dimensions, in particular of the supporting plates 2.
  • the heating element 1 of the invention may have smaller size and lower weight with respect to the known heating elements of equal power.
  • the electric heating element 1 of the invention may therefore be advantageously used in the new generation portable hairdryers which are increasingly more compact, lighter and easier to handle.
  • the supporting plates 2 comprise a plurality of first slots 4, each of which comprising, in addition to the first seat 24 for a portion of the first resistive wire 11, a further first seat 25 suitable to receive a portion of the second resistive wire 12.
  • the first slots 4 are substantially the same as the second slots 5 since they comprise two first seats 24, 25 for supporting respective windings 21, 22. It is also provided that the further second seats 25 of the first slots 4 are arranged to receive and support a portion of a third resistive wire, wound around the supporting plates 2 to form a third heating winding.
  • This variant of the electric heating element 1 allows to further increase the performance in terms of heating power with the same size and overall dimensions of the supporting plates
  • Figure 7 illustrates another variant of the electric heating element 1 of the invention which differs from the embodiment previously described and illustrated in Figures 1 to 5 in that the supporting plates 2 comprise a plurality of first slots 4, each of which comprising a plurality of first seats 24, 25, 26, e.g., three, overlapped and aligned along the direction A and arranged to receive portions of at least one resistive wire, in particular portions of a first resistive wire 11, of a second resistive wire 12 and of a third resistive wire 13.
  • the first resistive wire 11 has a transverse cross-section, e.g., circular, having a width (first transverse dimension bl) smaller than the width (second transverse dimension b2) of the cross-section, e.g., flat rectangular, of the second resistive wire 12, and the third resistive wire 13 has a cross-section, e.g., flat rectangular, having a width (third transverse dimension b3) greater than the width (second transverse dimension b2) of the cross-section of the second resistive wire 12.
  • the first seats 24, 25, 26 of each first slot 4 are placed apart from each other at a second distance d2 greater than a defined minimum insulation distance between resistive wires supplied by electric current, in compliance with the reference safety standards for portable hairdryers.
  • the plurality of second slots 5 of the supporting plates 2 comprise a plurality of second slots 5, each of which having a plurality of second seats 15, 16, 17, e.g., three, overlapped and aligned along the direction A and arranged to receive respective portions of at least one resistive wire 11, 12, 13, in particular portions of the first resistive wire 11, the second resistive wire 12 and the third resistive wire 13.
  • the second seats 15, 16, 17 of each second slot 5 are placed apart from each other at a second distance d2 greater than a defined minimum insulation distance between resistive wires supplied by electric current, in compliance with the reference safety standards for portable hairdryers.
  • This variant of the electric heating element 1 of the invention allows a further increase in the heating power since the supporting plates 2, while maintaining the same size, allow three different heating windings 21, 22, 23 to be supported.

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  • Cleaning And Drying Hair (AREA)
  • Resistance Heating (AREA)

Abstract

An electric heating element (1) for hairdryer comprises a plurality of supporting plates (2) made of electrical insulating material, fixed to each other angularly spaced about a longitudinal main axis (X) and provided on respective external longitudinal edges (3) with first slots (4) suitable to receive and support at least a first resistive wire (11) wound around the supporting plates (2) so as to form a first heating winding (21); each supporting plate (2) further comprises on the respective external longitudinal edge (3) respective second slots (5) interposed between the first slots (4) and suitable to receive and support said first resistive wire (11) and at least one second resistive wire (22) wound around the supporting plates (2) to form a second heating winding (22); the first resistive wire (11) and second resistive wire (12) are able to generate heat when supplied by electric current.

Description

Heating element for hairdryer
The present invention relates to portable hairdryer devices, and in particular refers to an electric heating element for heating air in portable hairdryers.
The known portable hairdryers, intended for both professional and home use, are electrical appliances equipped with an external casing typically made of plastics, provided with a handle and inside which an electric motor, a fan of the centrifugal or axial type, connected to and rotated by the electric motor, and one or more electric heating elements, especially electrical resistors, for air heating, are housed.
When the hairdryer is in use, i.e., when the electric motor and the heating element are powered by electric current, the fan is driven in rotation by the electric motor and generates inside the casing, more precisely in an air duct formed therefrom, an air flow which is sucked into the rear part of the hairdryer through a suction aperture, flows into the duct and outflows from a front dispensing aperture of the casing. The air flow passes through the heating element (electrical resistor) which produces heat by Joule effect upon passage of electric current, thereby it heats up and outflows, heated, through the dispensing aperture of the hairdryer.
The heating elements for hairdryers are electrical resistors or resistances generally comprised of one or more resistive metal wires wound around a plurality of plates made of an electrical insulating material, e.g., micanite, suitably shaped and arranged radially to each other to form a substantially tubular structure insertable inside the air duct of the hairdryer. The insulating material plates have on their external edges a series of indentations or slots suitable to receive and hold one or more spiral-, helix-, wave-shaped resistive wires, in order to dispose the greatest amount thereof in the least space or volume. The distance or pitch between two adjacent slots must be greater than a defined minimum insulation distance between the resistive and heating wires, which avoids contacts and/or electrical discharges between them in use in compliance with the reference safety standards.
The heating power generated by the electrical resistor is proportional to the overall length of the resistive wire(s) supplied by electric current and hit by the air flow.
Currently, there is a tendency in the field of portable hairdryers to increasingly reduce the size and the overall weight of the appliances, but without decreasing, or even by increasing, the power with which the fan is operated and the air flow is generated and heated. It is in fact known that the prolonged use of a bulky and heavy hairdryer, especially by professionals in the field of hairstyling which keep the upper limbs raised for long periods of time and perform cyclically repetitive movements, can lead to harmful consequences on muscles and tendons of the hand- wrist-elbow-shoulder system, in some cases with the risk that the disease becomes chronic.
In this respect, in the latest generation hairdryers, electric motors having small size and low weight are used, which are however able to supply the same power as conventional electric motors by rotating the fans at higher speeds in order to obtain the required air flows. Likewise, the electrical resistors must have increasingly smaller overall dimensions, while still ensuring an unchanged or increased heating power, suitable to the greater air flows generated by the electric motors, i.e., a greater length or extension of the heating resistive wires.
However, the electrical resistors made with the known construction techniques are no longer able to meet the new demands for limited overall dimensions and increased heating power. An object of the present invention is to improve the electric heating elements for portable hairdryers, in particular the electrical resistors or resistances made with one or more resistive metal wires wound around plates made of electrical insulating material.
Another object is to provide an electric heating element for portable hairdryers having a particularly compact and reduced size, while being capable of generating a high heating power in use, when supplied by electric current.
A further object is to provide an electric heating element for portable hairdryers which is simple and inexpensive to produce.
These and other purposes are achieved by an electric heating element for portable hairdryers according to claim 1.
The invention can be better understood and implemented with reference to the attached drawings which illustrate exemplifying and non-limiting embodiments thereof, wherein:
Figure 1 is a front view of the electric heating element for hairdryers of the invention; Figure 2 is a section according to the plane II-II in Figure 1 ;
Figure 3 is a perspective view of the electric heating element for hairdryer in Figure 1 ; Figure 4 is an enlarged view of a detail of the electric heating element in Figure 3; Figure 5 is an enlarged partial view of the electric heating element in Figure 2;
Figure 6 is an enlarged partial view of a variant of the electric heating element of the invention;
Figure 7 is an enlarged partial view of another variant of the electric heating element of the invention.
With reference to Figures 1 to 5, an electric heating element 1 for hairdryer is shown, comprising a plurality of supporting plates 2 made of electrical insulating material, fixed to each other angularly spaced about a longitudinal main axis X and provided on respective external longitudinal edges 3 further away from the main axis X with a plurality of first slots 4 suitable to receive and support at least one first resistive wire 11 wound around the aforementioned supporting plates 2 so as to form a first heating winding 21. Each supporting plate 2 comprises on the respective external longitudinal edge 3 a plurality of respective second slots 5 interposed between the first slots 4 and suitable to receive and support, in addition to the first resistive wire 21, at least one second resistive wire 22 wound around said supporting plates 2 so as to form a second heating winding 22. In particular, each second slot 5 is interposed between two first slots 4 that are adjacent along the respective external longitudinal edge 3.
Each first slot 4 comprises a respective first seat 14 suitable to receive a portion of the first resistive wire 11; in particular the first seat 14 comprises a bottom portion of the first slot 4 itself. On the other hand, each second slot 5 comprises a second seat 15 and a further second seat 16 which are suitable to receive and support respectively a portion of the first resistive wire 11 and a portion of the second resistive wire 12.
The first resistive wire 11 and the second resistive wire 12, in particular made of metal material for electrical resistors or resistances, are suitable to generate heat by Joule effect when supplied by an electric current.
With particular reference to Figure 5, the first resistive wire 11 has a cross-section with a first longitudinal dimension bl smaller than a second longitudinal dimension b2 of a second cross-section of the second resistive wire 12; that is, the cross-section of the first resistive wire 11 has a width smaller than that of the cross-section of the second resistive wire 12. The longitudinal dimensions bl, b2, i.e., the widths, are substantially parallel to the longitudinal main axis X.
The first slots 4 and the second slots 5 are regularly spaced from each other along the external longitudinal edges 3.
The supporting plates 2, e.g., made of micanite or other similar electrical insulating material, have a flat and elongated shape and are fixed to be angularly spaced, substantially radially, about the main axis X so as to form a substantially cylindrical structure. Alternatively, the supporting plates 2 may be shaped so as to form a nearly truncated cone-shaped frame. Each second slot 5 extends inside the respective supporting plate 2 towards the main axis X, in particular nearly orthogonal to the latter. The second seat 15 and the further second seat 16 of the second slot 5 are made almost overlapped and aligned along a direction A that is transverse, in particular substantially orthogonal to the main axis X, as well. More precisely, the second seat 15 comprises a bottom portion of the respective second slot 5 and the further second seat 16 comprises a couple of shoulders facing each other and made on opposite internal walls 5a of the second slot 5, in particular arranged at the external longitudinal edge
3.
It should be noted that, since the first resistive wire 11 has a cross-section having a width (first longitudinal dimension bl) smaller than the width (second longitudinal dimension b2) of the cross section of the second resistive wire 12, it can be easily inserted inside the second slot 5 until it abuts against the bottom portion serving as the second seat 14 of the second slot 5. On the contrary, the second resistive wire 12, having a section with a greater width, stops when abutting against the shoulders forming the further second seat 16 and cannot penetrate further into the second slot 5.
In the embodiment shown in the figures, the first resistive wire 11 has, for example, a nearly circular cross-section, and the second resistive wire 12 has a flat cross-section, in particular rectangular, in order to steadily rest in the respective seats of the slots 4, 5 of the supporting plates 2. More precisely, the circular shape of the first resistive wire 11 allows the latter to be positioned steadily on the bottom portions of the second slots 5 which form the second seats 15 thereof, while the flattened shape of the second resistive wire 12 allows the latter to rest steadily and firmly on the shoulders which form the further second seats 16 of the second slots 5.
However, it is possible to provide resistive wires having sections of different shape, e.g., elliptical, the cross-section of the first resistive wire 11 in each case having a width (first longitudinal dimension bl) smaller than the width (second longitudinal dimension b2) of the cross-section of the second resistive wire 12.
On each supporting plate 2, the slots 4, 5 are made in such a way that a first distance dl between a first slot 4 and a second slot 5 that are adjacent along the external longitudinal edge 3 and a second distance d2 between the second seat 15 and the further second seat 16 of a second slot 5 are greater than a defined minimum insulation distance between resistive wires supplied by electric current, in compliance with the reference safety standards for portable hairdryers.
The electric heating element 1 is provided with power cables 8 for connecting the first resistive wire 11 and the second resistive wire 12 to an electric power supply circuit of a hairdryer on which said electric heating element 1 is mounted.
The resistive wires 11, 12 are wound as a helix around the supporting plates 2 so as to form the first winding 21 and the second winding 22 and have a wavy course to increase their unwinding length and therefore the heating power which they are able to generate.
In this regard, it should be noted that the electric heating element 1 of the invention having supporting plates 2 which have second slots 5 capable of housing two separate windings, being provided with a further second seat 16 to house the second heating winding 22, allows to considerably increase, by about 20-25%, the generated heating power, while maintaining unchanged the size and the overall dimensions, in particular of the supporting plates 2. On the other hand, if one wants to maintain the same performance in terms of delivered heat, the heating element 1 of the invention may have smaller size and lower weight with respect to the known heating elements of equal power.
The electric heating element 1 of the invention may therefore be advantageously used in the new generation portable hairdryers which are increasingly more compact, lighter and easier to handle.
With reference to Figure 6, a variant of the electric heating element 1 of the invention is provided, which differs from the previously described embodiment in that the supporting plates 2 comprise a plurality of first slots 4, each of which comprising, in addition to the first seat 24 for a portion of the first resistive wire 11, a further first seat 25 suitable to receive a portion of the second resistive wire 12. In this embodiment, the first slots 4 are substantially the same as the second slots 5 since they comprise two first seats 24, 25 for supporting respective windings 21, 22. It is also provided that the further second seats 25 of the first slots 4 are arranged to receive and support a portion of a third resistive wire, wound around the supporting plates 2 to form a third heating winding.
This variant of the electric heating element 1 allows to further increase the performance in terms of heating power with the same size and overall dimensions of the supporting plates
2.
Figure 7 illustrates another variant of the electric heating element 1 of the invention which differs from the embodiment previously described and illustrated in Figures 1 to 5 in that the supporting plates 2 comprise a plurality of first slots 4, each of which comprising a plurality of first seats 24, 25, 26, e.g., three, overlapped and aligned along the direction A and arranged to receive portions of at least one resistive wire, in particular portions of a first resistive wire 11, of a second resistive wire 12 and of a third resistive wire 13.
In this variant, the first resistive wire 11 has a transverse cross-section, e.g., circular, having a width (first transverse dimension bl) smaller than the width (second transverse dimension b2) of the cross-section, e.g., flat rectangular, of the second resistive wire 12, and the third resistive wire 13 has a cross-section, e.g., flat rectangular, having a width (third transverse dimension b3) greater than the width (second transverse dimension b2) of the cross-section of the second resistive wire 12.
The first seats 24, 25, 26 of each first slot 4 are placed apart from each other at a second distance d2 greater than a defined minimum insulation distance between resistive wires supplied by electric current, in compliance with the reference safety standards for portable hairdryers.
Similarly, the plurality of second slots 5 of the supporting plates 2 comprise a plurality of second slots 5, each of which having a plurality of second seats 15, 16, 17, e.g., three, overlapped and aligned along the direction A and arranged to receive respective portions of at least one resistive wire 11, 12, 13, in particular portions of the first resistive wire 11, the second resistive wire 12 and the third resistive wire 13.
The second seats 15, 16, 17 of each second slot 5 are placed apart from each other at a second distance d2 greater than a defined minimum insulation distance between resistive wires supplied by electric current, in compliance with the reference safety standards for portable hairdryers.
This variant of the electric heating element 1 of the invention allows a further increase in the heating power since the supporting plates 2, while maintaining the same size, allow three different heating windings 21, 22, 23 to be supported.

Claims

1. Electric heating element ( 1 ) for hairdryer comprising a plurality of supporting plates (2) made of electrical insulating material, fixed to each other angularly spaced about a longitudinal main axis (X) and provided on respective external longitudinal edges (3) with first slots (4) suitable to receive and support at least a first resistive wire (11) wound around said supporting plates (2) so as to form a first heating winding (21) and respective second slots (5) interposed between said first slots (4) and suitable to receive and support said first resistive wire (11) and at least one second resistive wire (22), said second resistive wire (22) being wound around said supporting plates (2) so as to form a second heating winding (22), said first resistive wire (11) and said second resistive wire (12) being able to generate heat when supplied by an electric current, characterized in that each second slot (5) comprises a second seat (15) and at least one further second seat (16) which are suitable to receive respectively a portion of said first resistive wire (11) and a portion of said second resistive wire (12), said first resistive wire (11) having a respective cross-section with a first longitudinal dimension (bl) smaller than a second longitudinal dimension (b2) of a respective second cross-section of said second resistive wire (12).
2. Electric heating element (1) according to claim 1, wherein each second slot (5) is interposed between two first slots (4) adjacent along the respective external longitudinal edge (3).
3. Electric heating element (1) according to claim 1 or 2, wherein each first slot (4) comprises a respective first seat (14) suitable to receive a portion of said first resistive wire (11), in particular said first seat (14) comprising a bottom portion of said first slot
(4).
4. Electric heating element (1) according to any preceding claim, wherein said first longitudinal dimension (bl) and said second longitudinal dimension (b2) are substantially parallel to said longitudinal main axis (X).
5. Electric heating element (1) according to claim 4, wherein said second slot (5) extends inside the respective supporting plate (2) towards said main axis (X), said second seat (15) and said further second seat (16) being almost overlapped and aligned along a direction (A) that is transverse, in particular substantially orthogonal, to said main axis (X).
6. Electric heating element (1) according to claim 4 or 5, wherein a first distance (dl) between a first slot (4) and a second slot (5) that are adjacent along the respective external longitudinal edge (3) of each supporting plate (2) and a second distance (d2) between said second seat (15) and the corresponding further second seat (16) of a second slot (5) are greater than a defined minimum insulation distance between resistive wires supplied by electric current.
7. Electric heating element (1) according to any of claims 4 to 6, wherein said second seat (15) comprises a bottom portion of the respective second slot (5) and said further second seat (16) comprises a couple of shoulders made on opposite internal walls (5a) of said second slot (5), in particular at the respective external longitudinal edge (3).
8. Electric heating element (1) according to claim 7, wherein said first resistive wire (11) has a nearly circular cross-section and said second resistive wire (12) has a flat cross- section, in particular rectangular, in order to steadily rest respectively on said second seats (15) and said further second seats (16).
9. Electric heating element (1) according to any preceding claim, wherein said supporting plates (2) have a flat and elongated shape and are fixed to be angularly spaced about and in parallel with said main axis (X).
10. Electric heating element (1) according to any preceding claim, wherein each first slot (4) further comprises a further first seat (25) suitable to receive a portion of said second resistive wire (12) and/or a portion of a third resistive wire (13), the latter being wound around said supporting plates (2) so as to form a third heating winding (23).
11. Electric heating element (1) according to any preceding claim, wherein each first slot
(4) comprises a plurality of first seats (24, 25, 26) almost overlapped and aligned along a direction (A) that is transverse, in particular substantially orthogonal, to said main axis (X) and arranged to receive respective portions of at least one resistive wire (11, 12, 13, 14), said first seats (24, 25, 26) being placed apart from each other at a distance that is greater than a defined minimum insulation distance between resistive wires supplied by electric current.
12. Electric heating element (1) according to any preceding claim, wherein each second slot
(5) comprises a plurality of second seats (15, 16, 17) almost overlapped and aligned along a direction (A) that is transverse, in particular substantially orthogonal, to said main axis (X) and arranged to receive respective portions of at least one resistive wire (11, 12, 13), said second seats (15, 16, 17) being placed apart from each other at a distance that is greater than a defined minimum insulation distance between resistive wires supplied by electric current.
PCT/IB2019/060438 2018-12-05 2019-12-04 Heating element for hairdryer WO2020115677A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000010827 2018-12-05
IT102018000010827A IT201800010827A1 (en) 2018-12-05 2018-12-05 Heating element for hair dryer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114867334A (en) * 2022-05-31 2022-08-05 绍兴市益强电器科技有限公司 Radiation-proof heating frame

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CN118216756A (en) * 2022-12-21 2024-06-21 泰纳克塔集团股份公司 Hair treatment device with motorized resistor having flat portion of wire

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GB993317A (en) * 1960-09-08 1965-05-26 Firth Cleveland Ltd Improvements relating to electric heater elements
GB2034560A (en) * 1978-11-14 1980-06-04 Lichenauer F Electrical heating element for fluid media
US6732450B1 (en) * 2003-07-11 2004-05-11 Shu-Lien Chen Electrothermal rack of hair dryer
GB2516249A (en) * 2013-07-16 2015-01-21 Dyson Ltd Heater for a hand held appliance

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CN114867334A (en) * 2022-05-31 2022-08-05 绍兴市益强电器科技有限公司 Radiation-proof heating frame
CN114867334B (en) * 2022-05-31 2022-12-13 绍兴市益强电器科技有限公司 Radiation-proof heating frame

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