WO2020225652A1

WO2020225652A1 - Heating device, fan device, and hair dryer

Info

Publication number: WO2020225652A1
Application number: PCT/IB2020/054011
Authority: WO
Inventors: Daniele FERRI; Renzo Re; Pierpaolo Laveni
Original assignee: Gamma S.P.A.
Priority date: 2019-05-08
Filing date: 2020-04-29
Publication date: 2020-11-12
Also published as: IT201900006645A1

Abstract

An air heating device (1) for a hair dryer, hand dryer, electric heater, paint stripper, and other similar devices for heating air, comprising at least one metal bridge (5) on which an electrical connector (6) is applied, the electrical connector (6) defining a gripping point suitable for retaining the electric wire (F) by interlocking it.

Description

DESCRIPTION

“HEATING DEVICE, FAN DEVICE, AND HAIR DRYER”

This invention relates to an air heating device for a hair dryer, hand dryer, electric heater, paint stripper, or other device for heating the air and a fan device for a hair dryer.

This invention also relates to a hair dryer.

For the sake of descriptive simplicity, explicit reference will be made below to hair dryers as the sector with the highest rate of development in recent years. However, where technically applicable, everything that is described with explicit reference to a hair dryer is also applicable, mutatis mutandis, to a different hot air flow generator operating by Joule effect.

Therefore, this invention finds its main application in the field of small household appliances and more precisely in the production and manufacture of the heating components to be inserted inside the blow duct of a hair dryer.

The hair dryer sector, which for several years has been poorly innovated with regard to the final product, has recently had a considerable innovative boost both from the point of view of technology and from the point of view of the design.

In particular, new blow duct shapes have been developed, including the classic tapered tubular body or with different and more attractive geometries. For example, these different geometries include those known ones with an annular extension wherein the blow duct extends in an annular way inside a chamber suitably delimited by a pair of concentric tubes.

Disadvantageously, it is known that during assembly, in order to connect the heating device resistors to the respective electrical circuits or control boards, it is necessary to weld or crimp the electric wires of the various components to the respective connectors of the heating device. Disadvantageously, the welding solution is expensive and difficult to implement, entailing the possibility of damaging certain components, while the production of resistors with already connected crimped cables requires different resistor models depending on the length of the cables and the automatic assembly of the resistor and the final device is prevented or overcomplicated. In particular, if the heating device and other components of the hair dryer were sold separately, there would be a risk that a user could damage them, thus leading to a malfunction of the hair dryer as well as economic damage.

The technical task of this invention is therefore to provide a heating device, a fan device, a hair dryer, and an assembly method that are able to overcome the drawbacks that have emerged from the prior art.

The purpose of this invention is, therefore, to provide a heating device and a fan device that enable an easier assembly of the various components defining the hair dryer.

Another purpose of this invention is, therefore, to provide a hair dryer with simplified assembly.

Another purpose of this invention is, therefore, to provide a compact and efficient heating device, fan device, and hair dryer.

Said purposes are achieved with a heating device, a fan device, and a hair dryer having the features contained in one or more of the claims below.

In particular, these purposes are achieved with an air heating device for a hair dryer, comprising an insulating support developing along an axis of development between a first section, used as an inlet, and a second section, used as an outlet for an air flow, and comprising a plurality of radial baffles angularly spaced apart so as to define a plurality of angular sections. The device also comprises a resistive winding comprising at least one resistive wire extending helically between a first and a second end and defining a predetermined number of coils wound on the radial baffles and arranged in succession along the axis of development of the device.

The device comprises at least two metal bridges fixed to the insulating support and provided with a first end, in electrical connection with said first or second end of the resistive wire, and a second end equipped with an electrical connector. The electrical connector comprises a main body equipped with an insertion portion, defining an inlet aperture for an electric wire along an insertion direction and a contact portion arranged along the insertion direction and provided with at least two prongs extending in reciprocal approach defining a gripping point suitable for retaining the electric wire by interlocking it.

The insulating support may comprise a plurality of metal bridges comprising respective electrical connectors.

Advantageously, this solution does not involve welding the electric wires to the respective connectors enabling the components of the hair dryer to be easily assembled.

The metal bridge preferably comprises a connection portion connecting to the insulating support.

This connection portion preferably defines a fulcrum of the metal bridge so as to easily orient the electrical connector to facilitate the user’s interlocking the electric wires. In addition, this feature makes it possible to obtain a smaller mass of components so that the hair dryer is more compact compared to known ones.

Said purposes are also achieved with a fan device for hair dryers, comprising a heating device as above, an electric motor equipped with a stator body housed inside the insulating support and equipped with a drive shaft that can rotate coaxially to the central axis, and a fan fixed to one free end of the drive shaft and provided with a plurality of blades shaped to generate an air flow directed towards the heating device.

The fan device is also preferably equipped with a drive circuit of the electric motor and with a heating device abutted against the stator body of the electric motor. The drive circuit is equipped with respective metal bridges equipped with electrical connectors so as to connect the electric wires of the electric motor and the heating device to the drive circuit by interlocking them. Said purposes are also achieved with a hair dryer comprising a handle, a main body extending transversely or longitudinally to the handle and a heating device placed inside the main body.

The main body preferably defines an annular chamber inside thereof that is delimited by an internal tubular wall and an external tubular wall. The annular chamber has at least one outlet annular mouth placed at one axial end thereof.

These and other features, together with the advantages related thereto, will become more apparent from the following illustrative, and therefore non-limiting, description of a preferred, and thus non-exclusive, embodiment of a heating device, a fan device, a hair dryer, and an assembly method as shown in the accompanying figures, wherein:

- Figures 1 a-1 d are a perspective representation of a component of the heating device that is the subject of this invention according to different embodiments;

- Figures 2-6 are a perspective view of a heating device that is the subject of this invention according to different embodiments.

With reference to the attached figures, the reference number 1 indicates, as a whole, an air heating device for a hair dryer, hand dryer, electric heater, paint stripper, or other similar devices for heating the air, which, for simplicity of description, will hereinafter be referred to as the device 1.

For the sake of descriptive simplicity, explicit reference will be made below to hair dryers as the sector with the highest rate of development in recent years. Flowever, where technically applicable, everything that is described with explicit reference to a hair dryer is also applicable, mutatis mutandis, to a different hot air flow generator operating by Joule effect.

The device 1 comprises a resistive winding 2 comprising at least one resistive wire 2a defining a predetermined number of coils arranged along an axis of development“A” of the device 1. The resistive wire 2a extends helically between a first and a second end of the same. It should be noted that, as shown in the attached figures (for example, in Figure 4), fewer coils than those actually arranged along the axis of development “A” of the device 1 are represented for simplicity of illustration.

The resistive wire 2a is preferably shaped according to at least one predetermined wave shape, comprising, for example, sinusoidal and/or zig-zag and/or square undulations, and, more generally, undulations of any shape.

The wave shape and wave shapes of the resistive wire 2a have variable undulation densities along the wire itself. Thus, it is possible to obtain a greater or lesser thermal energy dispersion power by optimising, therefore, the operation parameters of the electrical resistor.

The resistive wire 2a may preferably, additionally have straight portions that, however, do not have a predetermined wave shape.

The resistive winding 2 has the purpose of heating an air flow that hits it by passing through the device 1 itself.

In some embodiments, not illustrated here, the winding could comprise a plurality of resistive wires “F” that are electrically (and geometrically) parallel to each other.

The device 1 also comprises an insulating support 3 supporting the coils and developing along the axis of development“A”. The insulating support 3 extends between a first section and a second section, respectively defining, in use, an inlet and an outlet for the air flow. In other words, the insulating support 3 extends between an inlet section and an outlet section for the air flow.

The insulating support 3 comprises a plurality of radial baffles 3a that are angularly spaced apart so as to define a plurality of angular sections“S”. The coils are wound on the radial baffles 3a and are arranged in succession along the axis of development“A” of the device 1. The insulating support 3 (or the radial baffles 3a) is preferably made of an electrical insulating and thermal resistant material, for example mica or another antistatic material.

In some embodiments (for example, illustrated in Figures 4 and 6), the insulating support 3 has sub-supports 3b each of which is suitable for supporting a series of coils. Figures 4 and 6 represent insulating supports 3 equipped with two sub-supports 3b, while Figure 5 represents four sub supports 3b. In other words, it is possible to produce an insulating support 3 equipped with a plurality of sub-supports 3b the number of which can vary based on construction needs. In this embodiment, each sub-sub- support 3b defines two radial baffles 3a of the insulating support 3.

In the embodiment illustrated in Figures 2 and 3, the insulating support 3 comprises an internal tubular body 3c extending along the axis of development“A”. The inner tube 3c is provided with an external surface and an internal surface. The radial baffles 3a extend from the external surface and are angularly spaced apart so as to define the plurality of angular sections described above. In this case too, each radial baffle 3a is configured to support the series of coils.

The device 1 also preferably comprises a safety device placed in electrical connection with the resistive winding 2 and/or a thermostat placed in electrical connection with the resistive winding 2.

The safety device and the thermostat are arranged electrically upstream of the resistive winding 2, in order to enable the current flow to be interrupted before it passes through the resistive wire.

The safety device is preferably a thermal fuse, more preferably calibrated (with temperatures from 70°C to 260°C) to prevent excessive temperatures in abnormal operating conditions.

The thermostat, on the other hand, is preferably calibrated (with temperatures from 60°C to 170°C) to open the contact, in a reversible manner, when a temperature limit value is exceeded.

The safety device and the thermostat are respectively housed in a first and a second angular section, which are adjacent to each other and separated by a respective, shared radial baffle 3a.

The device 1 preferably further comprises a thermistor arranged outside the insulating support 3 at a third angular section and oriented transversely to the axis of development“A”. The thermistor is arranged in the second section (the outlet section) in order to receive an air flow heated by the resistive winding 2. In this way, it is possible to minimise the delay between user perception and possible control.

The device 1 also comprises an outer body 6 (not represented in Figures 4-6) made of insulating material and arranged coaxially to the insulating support 3 around the resistive winding 2.

In the embodiment in Figures 2 and 3, the outer body has a tubular shape. The outer body 4 is preferably made of mica or the like, the same material as the radial baffles 3a.

The outer body 4 is fitted to the insulating support 3. At least a part of the radial baffles 3a preferably have, on an outer edge, a radial abutment shoulder sized so as to abut against a peripheral edge of the outer body 4. With reference to the insulating support 3, the same comprises at least one metal bridge 5 on which an electrical connector 6 is applied, as represented, for example, in Figures 1 A-1 D.

The device 1 preferably comprises at least two metal bridges 5 on which the respective electrical connectors 6 are applied.

Each metal bridge 5 preferably has an elongated shape extending along an axis of development“A1” thereof. The metal bridge 5 comprises a first end 5a, at least one connection portion 5b, and a second end 5c, on which the electrical connector 6 is applied, the latter being suitable for enabling a connection of an electric wire“F” by interlocking it.

The first end 5a is placed in electrical connection with the first or second end of the resistive wire 2a.

The at least one connection portion 5b makes it possible to create a connection (preferably a reversible one) with the insulating support 3. In the attached figures, the metal bridge 5 has two connection portions 5b wherein one coincides with the first end 5a. At least one of the two connection portions 5b can be selected to connect the metal bridge 5 to the insulating support 3.

Depending on the hair dryer model, or other construction needs, the metal bridge 5 has a different number of connection portions 5b or different shapes other than the elongated one. For example, in Figure 1 C and in Figure 1 D, the metal bridge 5 has an“L” shape wherein the metal bridge extends between a first axis of development“A1” and a second axis of development“A2” perpendicular to the first axis of development“A1”.

The connection portion 5b, interposed between the first end 5a and the second end 5c, is fixed to using mechanical connection means 5d to the insulating support 3. The mechanical connection means can be made in the shape of fastening buttons or locking pins for the connection portion 5b. Alternatively, the mechanical connection means 5d may comprise screws, plugs, or other devices that are suitable for fixing the metal bridges 5 to the insulating support 3.

If only one connection portion 5b is chosen to connect the metal bridge 5 to the insulating support 3, the connection portion 5b defines a fulcrum of the metal bridge 5. Thus, it is possible to orient the second portion 5c so as to facilitate a user’s inserting the electric wire“F” in the corresponding electrical connector 6 during the assembly of the device 1. Moreover, the ability to orient the metal bridge 5 (or the second portion 5c on which the electrical connector 6 is applied) makes it possible to reduce the dimensions of the electric wires "F”, enabling devices 1 (or hair dryers) to be constructed that are more compact and have reduced dimensions, making the various components simpler to assemble.

The electrical connector 6 comprises a main body 6a equipped with an insertion portion 6b, defining an inlet aperture for an electric wire“F” along an insertion direction“C”. The electrical connector 6 also comprises a contact portion 6d arranged along the insertion direction“C”. The contact portion 6d is provided with at least two prongs extending in reciprocal approach, defining a gripping point suitable for retaining the electric wire“F” by interlocking it.

The electrical connector 6 is also equipped with, preferably, an end stroke portion 6c, defined by a wall of the main body 6a so as to interrupt the advancement of the electric wire“F” along the insertion direction“C”. In other words, the end stroke portion 6c defines an obstacle to the advancement of the electric wire“F”.

The electrical connector 6 is preferably welded to the second end 5c of the metal bridge 5.

Alternatively, the electrical connector 6 is made of a single piece with the second end 5c of the metal bridge 5.

According to an embodiment like, for example, the one represented in Figures 1 A and 1 B, the main body 6a is defined as a box-shaped body wherein at least two prongs 6d are tilted so as to define a pair of contact elements that are spaced apart so as to lock the covering of the electric wire“F” and so as to enable the nucleus of the electric wire“F” to reach the end stroke portion 6c. The prongs are shaped so as to give a basically pointed shape to the contact portion 6d. The at least two prongs are preferably tilted in relation to each other in reciprocal approach following the insertion direction“C”. Thus, the prongs are suitable for defining a gripping point suitable for retaining the electric wire“F” by interlocking it. In other words, where the prongs reach an area of maximum proximity to each other, the gripping point is defined, it being suitable for retaining the electric wire“F” by interlocking it.

Thus, the gripping point is located in an area of maximum proximity of one prong in relation to the other of said pair of prongs.

As well as the two prongs described above, the electrical connector 6 may preferably be equipped with another prong of the contact portion 6d defining a support defining a guide portion suitable for maintaining the electric wire“F” directed along the insertion direction“C” of the main body 6a.

One embodiment of the electrical connector 6 is described in the patent GB2516555, although that described in this invention has a different application and is integrated into the metal bridge 5.

In the non-limiting embodiment in Figures 1 C and 1 D, the main body 6a is defined by the prongs themselves that are tilted so as to define a section along the insertion direction“C”, preferably a triangular one, suitable for retaining the corresponding electric wire“F”. In other words, the contact portion 6d is suitable for defining a section that is narrow enough to define a gripping point that extends along the whole length of the main body 6a of the electrical connector 6.

Advantageously, the electrical connector 6 makes it possible to connect the electric wire “F” by interlocking it, avoiding complicated welding operations.

Advantageously, both the metal bridge 5 and the electrical connector 6 facilitate its assembly.

In the attached figures, the electrical connector 6 is represented as a connector suitable for retaining a single electric wire“F”, but, depending on how the main body 6a is structured, it is possible that the electrical connector 6 may be used to connect a greater number of electric wires“F”. As represented in Figure 5 and in Figure 6, the device 1 comprises a plurality of metal bridges 5 on which the respective electrical connectors 6 are applied. In this embodiment, the metal bridges 5 are arranged on given radial baffles 3a. Alternatively, each radial baffle 3a is equipped with a respective metal bridge 5.

In the embodiment wherein the device 1 is equipped with a thermistor arranged externally to the insulating support 3 and oriented transversely to the axis of development A. The air heating device 1 further comprises two additional metal bridges 5’ fixed to the insulating support 3 and equipped with a first end 5a’, respectively attached to a corresponding end of the thermistor, and a second end 5c’ equipped with the electrical connector 6’. As shown in the non-limiting embodiment in Figures 2 and 3, the device 1 comprises a plurality of metal bridges 5 on which the respective electrical connectors 6 are applied, arranged on the internal tubular body 3c.

In addition, both the radial baffles 3a and the internal tubular body 3c, can be equipped with metal bridges 5.

The metal bridges 5 in both embodiments, are arranged at the first section (or the inlet section for the air flow).

In one embodiment, the device 1 comprises conductive electrical tracks “P” extending between the first section and the second section beginning from the at least one metal bridge 5. In other words, from each metal bridge 5 (or not) the above-mentioned conductive electrical tracks extend, making it possible to create multiple and complex connections with different electric wires“F” and/or with resistive wires 2a based on needs. In particular, the device 1 comprises at least one first metal bridge 5, the first end 5a of which is directly connected to the first end of the resistive wire 2a, and at least one second metal bridge 5 wherein the first end 5a is electrically connected to the second end of the resistive wire 2a by means of the corresponding electrical track“P” that extends between the first section and the second section of the insulating support 3.

Any electrical tracks“P” can preferably be external to the outer body 4 of the device 1.

Alternatively, like, for example, in the embodiment in Figures 2 and 3, any electrical tracks “P” can be inside the inner tube 3c of the insulating support 3.

As shown, for example, in Figure 2, the electrical track“P” can be hooked to the metal bridge 5 by means of a hooking portion 5e of the metal bridge 5 itself. In particular, the hooking portion 5e is made like a hook with a radial extension suitable for firmly connecting the hooking portion 5e and the corresponding portion of the electrical track“P”. The electrical track“P” is preferably equipped with a suitable hook for connecting with the hooking portion 5e of the metal bridge 5.

The device 1 can also comprise an integrated circuit 7 (see, for example, Figure 4) arranged inside the resistive winding 2. The integrated circuit 7 is equipped with corresponding electronics and arranged in a radially internal position in relation to the resistive winding 2. The device 1 comprises at least one corresponding metal bridge 5” fixed to the integrated circuit 7 and provided with a first end 5a, in electrical connection with the electronics and a second end 5c” equipped with the electrical connector 6”. Thus, it is easy to assemble, even a delicate component like the integrated circuit 7.

In particular, the solution described above makes it possible to mount the electric wires“F” on the integrated circuit without needing to perform any welding operations (that could damage the delicate components that define the integrated circuit 7).

As represented in Figure 4, the integrated circuit 7 preferably comprises a main board that extends along the longitudinal axis (the axis of development“A” of the insulating support 3) defining a first end and a second end of the main board. The integrated circuit comprises a plurality of metal bridges 5” arranged along the first end of the main board (coinciding with the first section of the device 1 or of the insulating support 3).

The plurality of metal bridges 5” is preferably also arranged along the second end of the main board. Alternatively, the plurality of metal bridges 5” is also arranged along a perimeter of the main board.

This invention also relates to a fan device for hair dryers (not illustrated) comprising a heating device 1 as described above.

The fan device also comprises an electric motor equipped with a stator body housed inside the insulating support 3 and equipped with a drive shaft that can rotate coaxially to the axis of development “A”. In the embodiment in Figures 2 and 3, the stator body is housed inside the internal tubular body 3c.

The drive shaft extends axially until a free end protruding from the first section of the insulating support 3. In other words, the free end protrudes from the axial dimension of the heating device 1.

In this regard, the fan device comprises a fan fixed to said free end of the drive shaft and is provided with a plurality of blades shaped so as to generate an air flow directed toward the heating device 1.

In particular, the fan faces the first section of the insulating support 3 and has a radial extension such that the blades at least partly face the resistive winding 2.

Advantageously, in this way, it is possible to obtain an extremely compact and functional structure, in which the heating and fanning/blowing operations are carried out in a limited space.

Moreover, the fan device preferably comprises a drive circuit (not illustrated) for the electric motor and/or for the heating device 1. The drive circuit is abutted against the stator body of the electric motor.

The drive circuit can preferably be made like the integrated circuit 7 described above so as to connect respective electric wires “F” of the electric motor and/or the heating device 1 to the drive circuit by interlocking them. In other words, the drive circuit can be shaped in an identical way to one of more the embodiments of the integrated circuit 7 described above. The drive circuit may preferably have a rectangular or square shape, or another shape, suitable for making it abut against the stator body of the electric motor and the metal bridges 5 can be positioned so as to facilitate the connection of the electric wires“F” of the electric motor and/or the device 1 to the drive circuit.

Advantageously, the drive circuit equipped with at least one metal bridge 5” on which a respective electrical connector 6” is applied makes it possible further reduce the internal dimensions of the hair dryer, in an identical way to that described beforehand with reference to the device 1. This invention also relates to a hair dryer comprising a handle and a main body extending transversely to the handle. The hair dryer also comprises a fan device like that described above.

Making reference to the heating device 1 in Figures 2 and 3, the main body of the hair dryer defines an annular chamber inside thereof that is delimited by an internal tubular wall and an external tubular wall. The annular chamber has an outlet annular mouth placed at one axial end thereof. In this context, the heating device 1 is placed inside the annular chamber and the electric motor, the fan, and any drive circuit mounted as described above.

Advantageously, the hair dryer described above is more compact and easier to assemble than known hair dryers.

This invention is able to overcome the drawbacks that have emerged from the prior art.

Advantageously, the metal bridge 5 on which the electrical connector 6 is applied facilitates the assembly of the various components of the hair dryer. In particular, the electrical connector 6 makes it possible to avoid using welding techniques, enabling respective electric wires “F” to be connected by interlocking them.

Advantageously, this invention enables an easier assembly than that of known hair dryers, making a fast assembly possible.

Claims

1. An air heating device (1 ) for a hair dryer, hand dryer, electric heater, paint stripper, and other similar devices, comprising:

- an insulating support (3) developing along an axis of development (A) between a first section, used as an inlet, and a second section used as an outlet for an air flow and comprising a plurality of radial baffles (3a) angularly spaced so as to define a plurality of angular sections;

- a resistive winding (2) comprising at least one resistive wire (2a) developing helically between a first and a second end and defining a predetermined number of coils wound on said radial baffles (3a) and arranged in succession along said axis of development (A) of the device (1 );

- at least two metal bridges (5) fixed to the insulating support (3) and provided with a first end (5a), in electrical connection with said first or second end of the resistive wire (2a), and a second end (5c) provided with an electrical connector (6);

characterised in that said electrical connector (6) comprises a main body (6a) provided with:

- an insertion portion (6b), defining an inlet aperture for an electric wire (F) along an insertion direction (C);

- a contact portion (6d) arranged along said insertion direction (C) and provided with at least two prongs developing in reciprocal approach, defining a gripping point suitable for retaining the electric wire (F) by interlocking it.

2. The air heating device (1 ) according to claim 1 , wherein each metal bridge (5) has a connection portion (5b) interposed between said first end (5a) and said second end (5c) and fixed by means of mechanical connection means (5d) to said insulating support (3), at said first section.

3. The air heating device (1 ) according to claim 1 or 2, further comprising a thermistor arranged externally to the insulating support (3) and oriented transversely to the axis of development (A); said air heating device (1 ) further comprising two additional metal bridges (5’) fixed to the insulating support (3) and equipped with a first end (5a’), respectively attached to a respective end of the thermistor and a second end (5c’) provided with said electrical connector (6’).

4. The air heating device (1 ) according to one or more of the preceding claims, wherein said electrical connector (6) is welded onto or made in one piece with said second end (5c) of the metal bridge (5).

5. The air heating device (1 ) according to one or more of the preceding claims, comprising one or more of the following devices:

- a safety device placed in electrical connection with said resistive winding

(2);

- a thermostat placed in electrical connection with said resistive winding (2).

6. The device (1 ) according to one or more of the above claims, further comprising an outer body (4) made of insulating material and arranged coaxially to the insulating support (3) around the resistive winding (2).

7. The device (1 ) according to one or more of the preceding claims, wherein said insulating support (3) comprises an internal tubular body (3c) developing along the axis of development (A) and provided with an external surface from which said plurality of radial baffles (3a) radiate, angularly spaced apart so as to define a plurality of angular sections.

8. The device (1 ) according to one or more of the preceding claims, comprising a plurality of metal bridges (5), on which respective electrical connectors (6) are applied, arranged on their respective radial baffles (3a).

9. The device (1 ) according to one or more of the preceding claims, comprising a plurality of metal bridges (5), on which respective electrical connectors (6) are applied, arranged on the internal tubular body (3c).

10. The device (1 ) according to one or more of the preceding claims, wherein said at least two metal bridges (5) comprise:

- a first metal bridge (5) wherein the first end (5a) is directly connected to the first end of the resistive wire (2a);

- a second metal bridge (5) wherein the first end is electrically connected to the second end of the resistive wire (2a) by means of a conductive electrical track (P) developing between said first section and said second section of the insulating support (3).

11. The device (1 ) according to one or more of the preceding claims, further comprising an integrated circuit (7) provided with respective electronics and arranged in a radially internal position with respect to said resistive winding (2); said device (1 ) comprising at least one metal bridge (5”) fixed to the integrated circuit (7) and provided with a respective first end (5a”), in electrical connection with said electronics and a second end (5c”) provided with said electrical connector (6”).

12. The device (1 ) according to one or more of the preceding claims, wherein said gripping point is located in an area of maximum proximity of one prong with respect to the other of said pair of prongs.

13. A fan device for a hair dryer, comprising:

- a heating device (1 ) according to any of the preceding claims, wherein said insulating support (3) comprises an internal tubular body (3c) developing along the axis of development (A);

- an electric motor provided with a stator body housed inside the insulating support (3) and provided with a drive shaft which can rotate coaxially to said axis of development (A);

- a fan fixed to a free end of the drive shaft and provided with a plurality of blades shaped to generate a flow of air directed towards the heating device (1 ).

14. A hair dryer comprising:

- a handle;

- a main body developing transversely or longitudinally to said handle; - a fan device according to claim 13 located inside said main body.