Steam hairdressing device with pump motor controlled according to different voltage values

Abstract

The invention relates to a steam hairdressing device comprising a liquid vaporisation device, a pump, an electric motor for actuating the pump and a control system for alternately supplying the electric motor with power at least - at a first voltage value (UN) so that the pump supplies the vaporisation device with liquid at a first supply mass flow rate; and - at a second voltage value (UT), different from the first voltage value (UN), such that the pump supplies the vaporisation device with liquid at a second supply mass flow rate, different from the first supply mass flow rate. The invention relates to devices for use in the field of hairdressing.

Description

STEAM HAIR STYLING APPLIANCE WITH PUMP MOTOR CONTROLLED BY DIFFERENT VOLTAGE VALUES TECHNICAL FIELD

[0001] The present invention relates to the general technical field of hairdressing appliances, for example for domestic use, intended to ensure the shaping, and / or beautification and / or improvement of the health of hair.

[0002] The invention relates more specifically to a steam hair styling device, comprising a liquid vaporization device for generating a steam stream from a liquid. The invention also relates to a method for producing steam using a steam hair styling device comprising a liquid vaporization device for generating a steam stream from a liquid. PREVIOUS TECHNIQUE

[0003] Hair styling tools exist that subject hair to a flow of steam, combined with mechanical and thermal treatment. This thermomechanical steam treatment is, for example, performed using a brush with heated bristles attached to a brush head equipped with steam vents. This steam emission, combined with the mechanical action of brushing and the thermal action provided by the heated bristles, facilitates the styling process and improves its efficiency, while preserving, at least to some extent, the hair's appearance.

[0004] While such well-known devices are generally satisfactory, they remain limited in terms of performance and steam generation features. Typically, the steam generation function of these devices is limited to emitting a single, predetermined flow of steam. The reliability and robustness of the components responsible for steam generation are not always optimal.

[0005] Furthermore, the activation of the steam generation function on these devices can sometimes be imperfect. In particular, instabilities in the flow rate of the generated steam can occasionally be observed. Moreover, the user is not always given any indication as to whether the device's steam emission mechanisms are actually functioning correctly. It is therefore sometimes difficult for the user to know if the device is truly ready for use or even simply operational. DESCRIPTION OF THE INVENTION

[0006] The objects assigned to the invention therefore aim to provide a response to the aforementioned needs and problems, and in particular to offer a new steam hair styling device with a more versatile controllable steam generation function, while still being of a particularly simple, reliable and robust design.

[0007] Another object of the invention aims to provide a new hairdressing device with a steam generation function allowing the emission of a steam flow that can be adapted to the type of hair treatment to be carried out and / or the type of hair to be treated.

[0008] Another object of the invention aims to provide a new hairdressing device with an optimized steam generation function, particularly at the start-up of the device.

[0009] Another object of the invention aims to provide a new hairdressing device whose use is particularly intuitive, especially for a user without particular hairdressing skills.

[0010] Another object of the invention aims to provide a new hairdressing device whose use is particularly practical and simple.

[0011] Another object of the invention aims to provide a new hair styling device whose design allows the hair to be subjected in a particularly effective way to a flow of steam.

[0012] Another object of the invention aims to provide a new hair styling device which, while allowing for easy and quick hair styling and shaping effects that are particularly satisfactory, significantly improves the appearance of the hair, and in particular its shine and surface condition.

[0013] Another object of the invention aims to propose a new method of producing steam by a hairdressing device allowing the latter to have a steam generation function which can be controlled in a more versatile way, while still being of a particularly simple, reliable and robust design.

[0014] Another object of the invention aims to propose a new method of producing steam by a hairdressing device allowing to obtain a flow of steam emitted by the device which can be adapted to the type of hair treatment to be carried out and / or according to the type of hair to be treated.

[0015] Another object of the invention aims to propose a new method of producing steam by a hairdressing device allowing optimized operation of a steam generation function of the hairdressing device, in particular at the start-up of the latter.

[0016] Another object of the invention aims to propose a new method of producing steam by a hairdressing device which is particularly simple, practical, efficient and easily understood by the user.

[0017] The objects assigned to the invention are achieved using a steam hair styling device comprising a liquid vaporization device for generating a steam stream from a liquid, a pump for supplying liquid to said vaporization device, an electric motor for operating said pump, and a control system designed and configured to control the power supply to the electric motor and alternately power the latter at least - according to a first electrical voltage value so that the pump supplies liquid to the vaporization device according to a first mass flow rate, and - according to a second electrical voltage value different from said first electrical voltage value so that the pump supplies liquid to the vaporization device according to a second mass supply flow rate which is different from said first mass supply flow rate.

[0018] The objects assigned to the invention are also achieved using a method of producing steam by a steam hairdressing device comprising a liquid vaporization device for generating a steam stream from a liquid, a pump for supplying said vaporization device with liquid, an electric motor for operating said pump, said method comprising: - a first operating stage of the hair styling device, during which said electric motor is powered according to a first electrical voltage value so that the pump supplies liquid to the vaporization device according to a first mass flow rate, and - a second stage of operation of the hairdressing device, during which said electric motor is supplied according to a second value of electrical voltage different from said first value of electrical voltage so that the pump supplies liquid to the vaporization device according to a second mass supply flow rate which is different from said first mass supply flow rate. SUMMARY DESCRIPTION OF THE DRAWINGS

[0019] Other features and advantages of the invention will become apparent and will be described in more detail upon reading the following description, with reference to the attached drawings, which are given solely as illustrative and non-limiting examples, including: - Figure 1 is a schematic perspective view of a hairdressing device according to the invention, which in this case is formed by a hairdressing brush; - Figure 2 is a schematic perspective view of the hair styling device in Figure 1, from which some casing elements and head elements have been omitted to reveal internal design details of the device. Furthermore, a piping element connecting the pump to a vaporization device has been omitted; - Figure 3 is a schematic, exploded view of the device in Figure 1. Some piping and electrical wiring elements in particular have been omitted; - Figure 4 is a schematic perspective view of the head of the hair styling device from the previous figures; - Figure 5 schematically illustrates in the form of a diagram a detail of an example design of a hairdressing device according to the invention; - Figure 6 schematically illustrates in the form of a graph an example of the configuration of the control system for the power supply of the electric motor of a hairdressing appliance according to the invention. The electrical supply voltage of the electric motor is identified by the letter U on the ordinate and expressed in volts (V), while time is identified by the letter t on the abscissa and expressed in seconds (s); - Figure 7 schematically illustrates in the form of another graph the example configuration of Figure 6. The mass flow rate of liquid supply to the vaporization device of the hairdressing appliance is identified by the letter D on the ordinate and expressed in grams per minute (g / min), while the time is identified by the letter t on the abscissa and expressed in seconds (s).

[0020] The invention relates, firstly, to a steam-powered hair styling device 1, that is to say, a hair styling device comprising means for emitting steam to subject hair to a flow of steam, particularly for the purpose of styling said hair. The hair styling device 1 according to the invention is preferably portable, that is to say, at least a part, and preferably all, of the device 1 is designed to be grasped and manipulated by hand. The hair styling device 1 is preferably a portable electric device, intended to be connected to the electrical distribution network (alternating current) for power. However, it is alternatively conceivable, without departing from the scope of the invention, that the hair styling device 1 incorporates electrical power supplies, possibly rechargeable.Hair styling device 1 is preferably designed for use in a domestic setting and is intended to provide hair styling, and / or hair beautification, and / or hair health improvement. Preferably, hair styling device 1 is designed for the user to use on themselves, i.e., on their own hair. However, it is perfectly conceivable that hair styling device 1 may be designed for use by the user on the hair of a third party (or another user). Preferably, hair styling device 1 is intended for use in a domestic setting. by a user (male or female) without any particular professional hairdressing skills. In the embodiment illustrated in the figures, the hairdressing appliance 1 constitutes a hairbrush. However, the invention is not limited to a hairdressing appliance 1 forming a hairbrush, and the hairdressing appliance 1 may, for example, constitute a straightening brush, a detangling brush, or a hair straightener, without departing from the scope of the invention.

[0021] As illustrated in the figures, the hair styling appliance 1 advantageously includes a handle 2 for manual gripping, intended to be grasped by the hand, for example, by the user, to operate the hair styling appliance 1. The handle 2 extends, for example, longitudinally along a central longitudinal axis X-X', between a first end from which, for example, a power cord emerges, and a second opposite end. The hair styling appliance 1 advantageously includes a head 3 for engaging the hair, that is, for preferably coming into contact with the hair in order to subject it to mechanical, thermal, and / or fluidic action. The head 3 is advantageously supported by the handle 2 and extends, for example, longitudinally along the aforementioned central axis X-X', between a rear end fixed to the second end of the handle 2 and a free front end.Preferably, as illustrated in the figures, the handle 2 has a substantially elongated shape extending into the head 3, which is advantageously wider than the handle 2 and, for example, has a generally oblong shape. Preferably, and as illustrated, the handle 2 and the head 3 are formed, at least in part, by a single, casing-like main body, for example, made of plastic. The head 3 advantageously has a front face 3A which, as in the embodiment illustrated in the figures, is preferably provided with brushing bristles 7 between and against which the hair is intended to rest and move during the use of the hair styling appliance 1.

[0022] Hair styling appliance 1 includes, advantageously included among the steam emission means mentioned above: - a liquid vaporization device 5 for generating, from a liquid, a vapor stream, which is advantageously intended to be directed towards and onto the user's hair, - a pump 61 to supply liquid to the vaporization device 5, an electric motor 62 to operate the pump 61, and - a control system 8 designed and configured to control the (electrical) power supply of the electric motor 62, and thus enable the latter to operate so that it actuates the pump 61 to supply liquid to the vaporization device 5.

[0023] Preferably, the liquid in question is water. The term "water" here can refer to any liquid containing mainly water (i.e. at least 50% by weight of water, and preferably at least 80% by weight of water, even more preferably at least 95% by weight of water) and capable of transforming into vapor, and thus includes distilled water, running tap water, but also various aqueous solutions containing cosmetic, olfactory, etc. elements.The term "vapor" should be taken here in a broad sense and thus refers indiscriminately to a substance (preferably water) in a gaseous state, or to said substance (preferably water) in a liquid state in the form of a mist of droplets and / or microdroplets, or even to a mixture of said substance (preferably water) in a gaseous state and said substance (preferably water) in a liquid state in the form of a mist of droplets and / or microdroplets. In other words, the expression "water vapor" should not be limited to its strictly scientific definition and here covers water in a gaseous state, liquid water particles suspended in the air, or a mixture of water in a gaseous state and liquid water particles (droplets / microdroplets) suspended in the air.

[0024] As in the embodiment illustrated in the figures, the vaporization device 5 advantageously comprises a vaporization chamber 50 provided with a liquid inlet 501 and at least one vapor outlet 502. Preferably, and as illustrated, the vaporization device 5 also comprises a first heating device 51 designed to heat the vaporization chamber 50 and thus transform the liquid into vapor within the vaporization chamber 50 (and therefore, preferably, liquid water into water vapor). The first heating device 51 is formed, for example, by one or more resistive elements capable of heating by Joule effect (for example, one or more heating elements, or thermistor(s), with a Positive Temperature Coefficient (PTC)), the resistive element(s) being advantageously arranged in contact with the vaporization chamber 50.The steam outlet 502 is advantageously in fluidic communication, of. permanent preference, with the surrounding outside air, preferably via at least one vapor ejection port 710, disposed on the front face 3A of the head 3 of the hair styling device 1. For example, the vapor ejection port(s) 710 is (are) in fluidic communication with the interior of the vaporization chamber 50 via a piping device 52 connected on one side to the vapor outlet 502 and on the other to at least one vapor ejection port 710.

[0025] As in the preferred embodiment illustrated in the figures, the vaporization chamber 50 is advantageously maintained at atmospheric pressure, as described above. This avoids the need for an outlet valve, due to the absence of vapor pressure buildup within the vaporization chamber 50 and the apparatus 1. Among the advantages of such a design are the absence of overpressure risk (and therefore the elimination of the need for means to prevent or manage such overpressures), as well as a reduced risk of ejecting a vapor stream at an excessively high temperature that could damage and / or burn hair or the scalp. Indeed, because the vaporization chamber 50 is not pressurized, the temperature of the water vapor stream advantageously does not exceed 100 °C.In addition, the speed of the steam flow and the distance traveled by it outside the device 1 are limited due to the absence of overpressure, which helps to limit the risk of burning the scalp, and therefore to greater safety for the user.

[0026] Advantageously, the aforementioned control system is further designed and configured to control the operation of the vaporization device 5 (and in particular the operation of its first heating element 51), and to bring the vaporization device 5 (and in particular its vaporization chamber 50) to a temperature at least equal to the vaporization temperature of the liquid in question. The control system 8 is thus advantageously electrically connected to the vaporization device 5, and in particular to its first heating element 51, in order to control its operation (and therefore regulate its operating temperature), and thus to control the temperature of the vaporization chamber 50 of the vaporization device 5.

[0027] Typically, the pump 61 and the electric motor 62 are included in a liquid supply device 6, which is included in the hair styling device 1, to supply liquid to the vaporizing device 5. Said liquid supply device 6 preferably includes, in addition to the pump 61 and the electric motor 62 for actuation thereof, a reservoir 60 for storing a quantity of liquid (preferably liquid water), the pump 61 being then connected in fluidic communication on the one hand with the reservoir 60, for example by means of a supply pipe 63, and on the other hand with the vaporizing device 5, for example by means of an outlet pipe (omitted in figure 2) connected to the supply inlet 501 of the vaporizing chamber 50.The pump 61, the electric motor 62, and the reservoir 60 are preferably integrated into the main body of the hair styling appliance 1, that is, arranged within or on said main body, to contribute to the portability of the hair styling appliance 1. The reservoir 60, for example, is removable, meaning it can be detached from the main body of the appliance 1, particularly for filling purposes, which notably eliminates the need for an earth connection for the appliance 1's power supply. To this end, the reservoir 60 is preferably at substantially atmospheric pressure. Furthermore, using a pump 61 with an atmospheric pressure reservoir 60, rather than a pressurized reservoir with a valve, ensures optimal safety in use and increased reliability in flow control.Preferably, the pump 61 is a peristaltic pump, which allows for very precise control of low flow rates and ensures relatively constant flow rates when necessary. Alternatively, a diaphragm pump or any other suitable type could be considered, although a peristaltic pump remains preferred. Preferably, as in the embodiment illustrated in the figures, the hair styling appliance 1 is without a heating device for the reservoir 60, so that the liquid contained in the reservoir remains substantially at ambient temperature during use of the hair styling appliance 1.

[0028] According to the invention, the control system 8 is designed and configured (at least) to control the (electrical) power supply of the electric motor 62 and, more specifically, to alternately (electrically) supply the latter at least - according to a first value UN of electrical voltage so that the pump 61, thus actuated by the electric motor 62 rotating at a first rotational speed, supplies liquid to the vaporization device 5 according to a first mass flow rate DN, and - according to a second value UT of electrical voltage different from said first value UN of electrical voltage so that the pump 61, thus actuated by the electric motor 62 rotating at a second speed of rotation different from said first speed, supplies liquid to the vaporization device 5 according to a second mass supply flow rate DT which is different from said first mass supply flow rate DN.

[0029] By "alternately supplying power," we mean supplying the electric motor either according to the first voltage value UN or according to the second voltage value UT. The first and second voltage values ​​UN and UT, the first and second rotational speeds, and the first and second mass flow rates DN and DT, are understood here to mean non-zero values, speeds, and mass flow rates, respectively.

[0030] Advantageously, the electric motor 62 is a direct current motor (DC motor), and preferably a brushed DC motor, for example, a permanent magnet brushed DC motor. Such an electric motor has the particular advantage of being simple, robust, compact, and inexpensive, and is therefore particularly well-suited to a portable steam hair styling appliance, especially one intended for home use. The first and second voltage values ​​UN and UT then correspond to DC voltage values ​​U. The electric motor 62 may, if necessary, be a geared electric motor or be mechanically connected to the pump 61 via a gearbox, so as to best adapt the rotational speed and the torque supplied to the pump 61.

[0031] The control system s is therefore designed and configured to control the power supply to the electric motor 62 driving the pump 61 according to at least two different values ​​UN, UT of electrical voltage U, so that the pump 61 delivers liquid at the outlet according to at least two different mass flow rates DN, DT. Thus, the control system 8 allows adjustment of the mass flow rate of liquid supplied to the vaporization device 5 by the pump 61, which is controlled, in a particularly simple manner, by a modification of the rotational speed of the electric motor 61 driving the pump 61. the effect of a change in the value of the electrical voltage U supplying the electric motor 61.

[0032] In the specific context of a steam hair styling device 1, such a means of regulating the mass flow rate of the liquid supply based on a control of the value of the electrical voltage U supplying the electric motor 62 proves advantageously more reliable and simpler, both in terms of its design and its operation, than a means of regulating the mass flow rate of the supply which would consist alternatively of modifying the operating speed of the electric motor 62, supplied according to a single, fixed value of electrical voltage U and by modulating the frequency of the voltage or current supplying the electric motor 62 (typically according to a principle of pulse width modulation (PWM).In the preferred case where, as previously considered, the electric motor 62 is a brushed DC motor, using frequency modulation of the electric motor 62's power supply would likely generate current ripple detrimental to the motor's lifespan and a source of losses, particularly due to the Joule effect. Furthermore, using frequency modulation of the power supply would likely generate undesirable electromagnetic pollution (high-frequency disturbances), necessitating the implementation of additional filter(s) to mitigate this, which would increase the complexity and cost of the device's design and manufacture.Furthermore, such a method of regulating the mass flow rate of the liquid supply, based on controlling the supply voltage of the electric motor 62, proves to be far more efficient, reliable, and simple, both in terms of its design and operation, than a method of regulating the mass flow rate that would consist of mechanically reducing, and / or via a fluid bypass circuit arranged downstream of the pump and upstream of the variable speed drive, a single, constant mass flow rate of liquid delivered by the pump, the latter being driven by an electric motor always rotating at the same speed. Thus, the pump 61 advantageously operates always at the required speed and only at that speed, utilizing all of the pump 61's energy. This results in energy savings (both fluid and electrical) and improved reliability of the pump 61.

[0033] Thus, thanks to the technical characteristics described above, the hair styling device 1 according to the invention has a steam generation function that can be controlled in a particularly versatile manner. The hair styling device 1 can advantageously emit a steam flow at at least two different (non-nuisance) mass flow rates, which notably offers the possibility of adapting the emitted steam flow rate to the type of treatment and / or the type of hair being treated with the hair styling device 1, and / or, as will be explained later, of optimizing the operation and, in particular, the activation of the steam generation function of the hair styling device 1, as well as potentially allowing the user to perceive the actual operation of said steam generation function.However, the steam generation function of the hair styling device 1 conforming to the invention remains of a particularly simple, reliable and robust design.

[0034] Advantageously, the said first value UN of electrical voltage is chosen such that the average value of the first mass flow rate of the supply DN is at least equal to 0.5 g / min (i.e. approximately 8.33 x 10⁻¹¹). 6 kg / s), preferably between 0.5 g / min and 3 g / min (i.e., between approximately 8.33 x 10 -6 kg / s and 5.10' 5 kg / s), preferably still between 0.5 g / min and 1.1 g / min (i.e., between approximately 8.33 x 10⁻¹²). 6 kg / s and approximately 1.83 x 10' 5 kg / s), and for example equal to 0.8 g / min (i.e. approximately 1.33 x 10⁻¹¹) 5kg / s). Advantageously, said second value UT of electrical voltage is chosen such that the average value of the second mass flow rate DT is between 0.6 g / min and 5 g / min (i.e., between 1.10' 5 kg / s and approximately 8.33 x 10' 5 kg / s), preferably between 1 g / min and 2.5 g / min (i.e., between 1.67 x 10⁻¹²). 5 kg / s and approximately 4.17 x 10' 5 kg / s), and for example approximately equal to 1.2 g / min (e.g., 2.10' 5kg / s). It is understood that the choice of the first and second values ​​UN, UT of electrical voltage, corresponding to the average values ​​of the first and second mass flow rates DN, DT that we wish to obtain, is made according to the electromechanical properties of the electric motor 62 and the mechano-hydraulic properties of the pump 61. Thus, for a particular desired average value of the first and / or second mass flow rate(s) DN, DT, the first and / or second value UN of electrical voltage may be different depending on the respective characteristics of the electric motor 62 and the pump 61 implemented.

[0035] Advantageously, one of the first UN and second UT values ​​of electrical voltage is substantially equal to a U value nOThe nominal operating voltage of the electric motor 62 driving the pump 61 (i.e., UN = Unom or UT = Unom) is the value of the nominal operating voltage of the electric motor 62, which allows for the optimization and increased reliability of the operation of the electric motor 62, and therefore of the hair styling appliance 1. The nominal operating voltage value of an electric motor corresponds to the supply voltage at which the electric motor has been specifically designed to operate optimally, particularly in terms of efficiency and lifespan. This nominal voltage value is generally provided by the manufacturer and / or indicated on a label affixed to the electric motor.

[0036] According to one variant, the control system 8 includes a manual selector to allow the user of the hair styling appliance 1 to directly manually switch the power supply of the electric motor 62 from one of the first and second voltage values ​​UN, UT to the other of said first and second voltage values ​​UN, UT. Thus, the user can directly adjust the mass flow rate of liquid supplied to the vaporizing device 5, according to the first or second mass flow rate DN, DT, and therefore the mass flow rate of the vapor stream emitted by the hair styling appliance 1.According to an alternative variant, the control system 8 is designed and configured to automatically switch the power supply of the electric motor 62 from one of the first and second voltage values ​​UN, UT to the other of said first and second voltage values ​​UN, UT. According to this variant, the control system 8 is therefore advantageously devoid of adjustment or selection means that would allow the user to directly and manually switch the power supply voltage of the electric motor 62 that drives the pump 61 from one of said first and second voltage values ​​UN, UT to the other.

[0037] Preferably, as schematically illustrated in example in Figure 5, the control system 8 includes a regulating element 81 for the electrical supply voltage of the electric motor 62 from a predefined input electrical voltage value UE, for example delivered by a power supply module electrical 9 of the hair styling appliance 1, and a microcontroller 82 for alternately transmitting to (i.e., to) the regulating unit 81 of the electrical supply voltage - a first control signal Si to control the power supply to the electric motor 62 according to said first value UN of electrical voltage, and - a second control signal S2 to control the power supply of the electric motor 62 according to said second value UT of electrical voltage.

[0038] Advantageously, the hair styling appliance 1 includes, as mentioned above, a power supply module 9, which is advantageously integrated into the main body of the appliance 1, and to which is therefore connected the control system s for controlling the power supply to the electric motor 62 from an input electric current delivered by the power supply module 9, said input electric current having said predefined input voltage value UE. Advantageously, the power supply module 9 is also intended to supply power to the first heating element 51 of the vaporizing device 5, and where applicable, to a second heating element 40 of a heating element 4, which will be discussed later.

[0039] In the case where the hair styling appliance 1 incorporates power supply batteries, possibly rechargeable, as a power source (direct current), the power supply module 9 may include said power supply batteries. In the preferred case where, as in the example illustrated in the figures, the hair styling appliance 1 is intended to be connected to the electricity distribution network as a power source (alternating current), the power supply module 9 may include a power cord, as previously mentioned, for connecting the power supply module 9 to the electricity distribution network.For example, since the electric motor 62 is advantageously a DC motor, as mentioned above, the power supply module 9 may include a rectifier circuit to convert the alternating current voltage from the electricity distribution network into a direct current voltage, and a chopper circuit to reduce said direct current voltage and thus deliver said predefined input voltage value UE. The power supply module 9 is advantageously electrically connected to the voltage regulator 81. power supply of the electric motor 62, to deliver to the latter the said value UE of predefined input electrical voltage.

[0040] Thus, when the control unit 81 receives the first control signal Si from the microcontroller 82, the control unit 81 supplies the electric motor 62 with the first voltage value UN from the predefined input voltage value UE. Alternatively, when the control unit 81 receives the second control signal S2 from the microcontroller 82, the control unit 81 supplies the electric motor 62 with the second voltage value UN from the predefined input voltage value UE. This preferred design advantageously allows for particularly simple and efficient management of the electric motor 62's power supply, especially when the control system 8 is designed and configured to automatically control a change in the electric motor 62's power supply, as described above.

[0041] According to the "manual" variant mentioned above, the manual selector is advantageously connected to the microcontroller 82 to trigger the emission of the first control signal Si or the second control signal S2 in response to an action performed by the user against the manual selector. According to the "automatic" variant, the microcontroller 82 may include, for example, a memory in which a predefined control law is programmed and / or be connected to one or more sensors for one or more operating or state parameters of the hair styling appliance 1, to automatically emit either the first control signal Si or the second control signal S2, advantageously without any specific intervention from the user.

[0042] Preferably, the power supply voltage regulator 81 comprises at least one linear voltage regulator 811, that is, a voltage regulator comprising an active electronic component operating in its linear region or a passive electronic component (for example, a Zener diode) operating in its reverse region. This significantly limits the generation of electromagnetic interference. This linear voltage regulator 811 advantageously provides a particularly reliable supply to the electric motor 62 under the effect of the Upon receiving the relevant control signal S2, a supply voltage U, the corresponding value of UN, UT, is lower than the predefined input voltage value UE. Even more preferably, the linear voltage regulator 811 is a low-dropout (LDO) linear regulator. The use of such a low-dropout linear regulator contributes to simplifying and improving the reliability of the electrical and electronic design of the hair styling appliance 1, and in particular the control system 8. Specifically, such a low-dropout linear regulator advantageously generates less electromagnetic interference than a DC / DC chopper. Therefore, it advantageously does not require the implementation of additional coil(s) and / or capacitor(s) to limit the generated interference and / or correct the output voltage.Preferably, one of the first and second values ​​UN, UT of electrical voltage is chosen to be equal to the predefined value UE of electrical input voltage, in order to further simplify the electrical and electronic design of the hairdressing appliance 1, and in particular of the control system 8. The regulating element 81 of the electrical supply voltage can then advantageously include a controlled switch 812, for example an NPN transistor switch, to supply the electric motor 62 according to the relevant value UN, UT of electrical voltage and equal to the predefined value UE of electrical input voltage, under the effect of receiving the corresponding control signal Si, S2.

[0043] For example, the second selected voltage value UT is equal to the predefined input voltage value UE (e.g., UT = UE = +5 V DC), and the first selected voltage value UN is (strictly) less than the second voltage value UT (e.g., UN = +3.3 V DC). In this case, the power supply voltage regulator 81 can then advantageously comprise, as schematically illustrated in Figure 5: - a linear voltage regulator 811, and preferably a low-dropout linear regulator, to deliver said first value UN of electrical voltage, under the effect of receiving the first control signal Si emitted by the microcontroller 82 (for example by lowering the voltage from +5 V DC to +3.3 V DC), and - a controlled switch 812, for example an NPN transistor switch, to alternately deliver the second value UT of electrical voltage, equal to the predefined input electrical voltage value UE, under the effect of receiving the second control signal S2 emitted by the microcontroller 82.

[0044] Advantageously, as in the embodiment illustrated in the figures, the hair styling appliance 1 includes at least one heating element 4 intended to come into contact with the hair to transfer heat to it. The steam emission means are then advantageously configured to subject the hair in contact with the heating element 4 to the steam flow. In other words, the hair styling appliance 1 is preferably designed so that hair can be simultaneously in at least local contact with the heating element 4 and subjected at least locally to a steam flow during the styling operation, during which the head 3 engages the hair, for example to brush it, preferably by means of the aforementioned brushing bristles 7.

[0045] Thus, the hair styling appliance 1 is preferentially designed to subject the hair held by the head 3 to a thermo-mechanical steam treatment, according to which the hair is simultaneously subjected to: - a mechanical action, due to the brushing action carried out by the movement of the front face 3A, from which brushing bristles 7 preferentially protrude, on and against the hair; - a thermal action, by contact and / or proximity with the heating element 4, which is advantageously carried by the head 3; - and a fluidic action, which in this case is a steam treatment, consisting of subjecting the hair engaged by the head 3 and in contact with and / or near the heating element 4 to steam (and preferably water vapor), advantageously via the steam ejection orifice(s) 710 / steam spikes 71 which will be described below.

[0046] The simultaneous and advantageously combined implementation of these three treatments (mechanical, thermal and steam) advantageously allows for the beautification, and / or treatment, and / or repair of hair, and also advantageously allows for the shaping of hair, in particular by disciplining it.

[0047] In the case where the hair styling appliance 1 advantageously includes such a heating element 4 intended to come into contact with the hair to transmit heat to it, as envisaged above, the control system 8 can advantageously be designed and configured to further control (directly or indirectly) the operation, or at least the thermal state, of the heating element 4. In this case, the control system 8 can then advantageously be electrically connected to a (second) heating device 40, designed and arranged to heat the heating element 4, in order to control its thermal state and in particular to control a (first) surface temperature. Alternatively, the operation of the heating element 4 could be controlled, for the same purposes, by a system other than the control system 8.The second heating device 40 can be formed, for example, by one or more resistive elements capable of heating by Joule effect (for example, one or more heating elements, or thermistor(s), with a Positive Temperature Coefficient (PTC)). Preferably, the second heating device 40 of the heating element 4 is separate from the first heating device 51 of the vaporization chamber 50.

[0048] According to a particular embodiment taking advantage of the above, the control system 8 is more specifically designed and configured to implement: - an operational mode (or "regime") EN, in which the electric motor 62 is supplied according to said first value UN of electrical voltage, and - a transient operating mode (or "regime") prior to the operational operating mode EN, in which the electric motor 62 is supplied according to said second value UT of electric voltage, which is greater (in the sense "strictly greater") than said first value UN of electric voltage.

[0049] Advantageously, the operational mode EN of the hair styling appliance 1 is a normal, "nominal" operating mode in which the hair styling appliance 1 can be used normally to style, brush, detangle, and / or straighten hair using a steam flow emitted by the hair styling appliance 1. The operational mode EN may advantageously correspond to a steady-state or quasi-steady-state (or "cruising") operating regime of the hair styling appliance 1. In said operational mode EN, the pump 61, driven by the electric motor 62, therefore supplies liquid to the device vaporization 5 according to said first supply mass flow rate DN (“normal mass flow rate” or “operational mass flow rate”). The control system 8 therefore advantageously controls the operation of the electric motor 62, by supplying the latter according to said first value UN of electrical voltage, so that the pump 61 draws liquid from the reservoir 60 and discharges it, according to said first supply mass flow rate DN, towards the vaporization device 5, and in particular towards the vaporization chamber 50 of the latter.

[0050] In the operational mode EN, the vaporization device 5 is advantageously at a temperature that allows the liquid to vaporize, that is, at a temperature whose value is at least equal to the vaporization temperature (T vap) of the liquid in question. The temperature of the vaporization device 5 in the operational mode EN is preferably substantially constant and whose (predefined) value is preferably between 100 °C and 180 °C, preferably still between 105 °C and 150 °C and for example substantially equal to 130 °C, so that the liquid thus supplied to the vaporization device 5 by means of the pump 61 is thus vaporized within the vaporization chamber 50 so as to form the vapor stream, or "operational vapor stream", intended to be directed towards and onto the user's hair.In this respect, the control system 8 is advantageously designed to control the first heating device 51 and bring the vaporization device 5, and in particular the vaporization chamber 50 of the latter, to a temperature whose value is at least equal to the vaporization temperature of the liquid in question, and for example in the ranges of values ​​or temperature value mentioned above, in said operational mode EN.

[0051] Advantageously, the transient operating mode ET, which precedes the operational operating mode EN, corresponds to a temporary, non-operational state of the hair styling appliance 1. The hair styling appliance 1 is therefore designed to exist in the transient operating mode ET, during which the appliance 1 is not normally intended for use in hair styling, and then in the operational operating mode EN, in which the appliance 1 is then fully usable for styling hair. In other words, unlike the operational operating mode EN, the transient operating mode ET is time-limited. regardless of the use of the hair styling device 1. Thus, when the hair styling device 1 is switched on, which corresponds, for example, to its power supply being switched on (preferably controlled by a switch), the device 1 is initially in the transient operating mode ET (which begins at time t0 in the example of Figures 6 and 7). The transient operating mode ET is then followed by the operational operating mode EN (which begins at time ts in the example of Figures 6 and 7), in which the device 1 advantageously remains until it is, for example, switched off (power supply cut off) by the user.

[0052] In the transient operating mode ET, the pump 61 driven by the electric motor 62 therefore supplies liquid to the vaporization device 5 according to said second mass feed flow rate DT, which is then greater (strictly) than said first mass feed flow rate DN (that is to say according to a non-zero value of the second mass feed flow rate DT which is (strictly) greater than a respective non-zero value of the first mass feed flow rate DN).Thus, while the first value UN of electrical voltage and the first mass flow rate DN advantageously correspond respectively to a "normal" electrical supply voltage value and a "normal" mass flow rate of liquid in the vaporization device 5, the second value UT of electrical voltage and the second mass flow rate DT advantageously correspond respectively to a "supercharged" electrical voltage value of the electric motor 62 and a "supercharged" mass flow rate of liquid in the vaporization device 5.The control system 8 therefore advantageously controls the operation of the electric motor 62, by supplying the latter according to the second value UT of electrical voltage, so that the pump 61 takes liquid from the reservoir 60 and pumps it, according to the second mass flow rate of supply DT, towards the vaporization device 5, and in particular towards the vaporization chamber 50 of the latter.

[0053] In the transient operating mode ET, the vaporization device 5 is advantageously at a temperature that allows the liquid to vaporize, that is, at a temperature whose value is at least equal to the vaporization temperature (T vap ) of the liquid in question. The temperature of the vaporization device 5 in the mode of The transient operating temperature ET is preferably substantially constant and its (predefined) value is preferably between 100 °C and 180 °C, preferably further between 105 °C and 150 °C, and for example substantially equal to 130 °C, so that the liquid thus supplied to the vaporization device 5 by means of the pump 61 is vaporized within the vaporization chamber 50. Such temperature ranges and values ​​are particularly well suited when the liquid is essentially water, for use of the apparatus 1 at ambient temperature and at an altitude close to sea level. It is preferable that, whether constant or not, the temperature of the vaporization device s be maintained greater than or equal to 100 °C during the aforementioned operational mode EN, but also during the transient operating mode ET, including in the event of a sudden liquid supply.However, it is advantageous that the temperature of the vaporization device 5 not be too high in order to avoid the occurrence of a heating phenomenon, which can be detrimental to the proper functioning of the vaporization device 5. A temperature of 130 °C, or at least advantageously between 105 °C and 150 °C, thus represents a good compromise. In this respect, the control system 8 is advantageously designed to control the first heating device 51 and bring the vaporization device 5, and in particular its vaporization chamber 50, to a temperature whose value is at least equal to the vaporization temperature of the liquid in question, and for example within the aforementioned temperature ranges, in the transient operating mode ET.

[0054] The ability of the hair styling appliance 1 to implement such a transient operating mode ET, during which the vaporizing device 5 is temporarily supercharged with liquid, thus due to an electrical "supercharging" of the electric motor 62, makes it possible, in particular, to quickly and efficiently initiate steam generation. This ensures that the appliance 1 is then in optimal condition to generate the steam flow ("operational steam flow") intended to be directed towards and onto the user's hair when the appliance 1 is in operational operating mode EN. In this sense, said transient operating mode ET can thus advantageously correspond to a so-called "forced initiation" regime of steam generation by the vaporizing device 5.This also allows all or part of the air present in the various liquid supply and / or steam guidance piping elements of the device 1 to be replaced by liquid and / or. of the steam and thus further accelerate the availability of the hair styling device 1 to the user. Moreover, such a temporary oversupply of liquid to the vaporizing device 5 can advantageously lead, during the transient operating mode ET, to a particularly imperfect vaporization of the liquid, resulting in the formation of vapor more heavily laden with droplets and / or microdroplets of liquid than the vapor subsequently generated during the operational operating mode EN.Insofar as said at least one vapor outlet 502 of the vaporization chamber 50 of the vaporization device 5 is advantageously in permanent fluidic communication with the surrounding outside air through said at least one vapor ejection orifice 710, as previously envisaged, it advantageously follows that the ejection from the apparatus 1, during the transient operating mode ET, of a vapor flow (“transient vapor flow” or “initial vapor flow”) is more visible to the naked eye by the user than is the vapor flow (“operational vapor flow”) which is subsequently ejected during the operational operating mode EN.Typically, since the fluid is water, the transient vapor flow may be emitted as a cloud or whitish mist, while the operational vapor flow, less laden with droplets and / or microdroplets of liquid water, is emitted in a more transparent form, less visible to the naked eye. This phenomenon then helps to visually inform the user that the vapor generation function of device 1 is indeed operational.

[0055] Furthermore, insofar as at least one steam outlet 502 of the vaporization chamber 50 of the vaporization device 5 is advantageously in permanent fluidic communication with the surrounding outside air, it follows that the transient steam flow can advantageously be ejected from the apparatus 1 in transient operating mode ET, preferably via at least one steam ejection orifice 710, according to a second steam mass flow rate ("transient steam mass flow rate" or "initial steam mass flow rate") which is greater than a first steam mass flow rate (or "operational steam mass flow rate") according to which the operational steam flow can advantageously be ejected from the apparatus 1 in operational operating mode EN. In other words, the implementation of the transient operating mode ET can advantageously result in the ejection of a steam jet. important (or "burst"). The emission of such an initial jet of steam also advantageously informs the user that the steam generation function of the appliance 1 is functioning correctly. Moreover, the emission of such an initial jet of steam can advantageously help to clear, where necessary, said at least one steam ejection orifice 710 of any small foreign bodies that may obstruct or at least partially cover it (dust, hair debris, dander, dried residue of hairspray or styling gel, etc.).

[0056] Thus, the device 1 is advantageously, at the end of the transient operating mode ET, in optimal steam generation operating conditions for optimal use of the device 1 in operational operating mode EN for styling, brushing, detangling and / or straightening hair using steam.

[0057] Preferably, the control system 8 is configured to automatically switch from the transient operating mode ET to the operational operating mode EN (the "automatic" variant). The switch from the transient operating mode ET to the operational operating mode EN is therefore preferably automatic, without any active user intervention. This ensures optimal operation of the hair styling appliance 1 without requiring any user intervention. However, the user can be alerted to the activation of the operational operating mode EN by any suitable signaling means, for example, by the cessation of the temporary steam flow emitted in the form of a cloud or a whitish mist.Preferably, the values ​​that the first and second supply flow rates DN, DT are then respectively likely to affect are fixed (by the designers of the device 1), that is to say, they are preferably not modifiable by the user. As such, the hair styling device 1 is therefore advantageously devoid of adjustment means allowing the user to directly set or adjust one or both of the values ​​of the first and second supply flow rates DN, DT; that is to say, advantageously devoid of adjustment or selection means allowing the user to switch the electrical supply voltage of the electric motor 62 driving the pump 61 from one of the first and second values ​​UN, UT to the other.

[0058] Advantageously, the control system 8 is configured so that, during the operational mode EN, the average value of the first mass flow rate of the feed DN is at least equal to 0.5 g / min (grams per minute, i.e. approximately 8.33 x 10⁻¹¹). 6 kg / s), preferably between 0.5 g / min and 3 g / min (i.e., between approximately 8.33 x 10⁻¹¹ 6 kg / s and 5.10' 5 kg / s), preferably still between 0.5 g / min and 1.1 g / min (i.e. between approximately 8.33 x 10⁻¹¹ 6 kg / s and approximately 1.83 x 10' 5 kg / s), and for example approximately equal to 0.8 g / min (i.e. about 1.33 x 10⁻¹¹) 5kg / s). Thus, the steam flow (operational steam flow) emitted by the steam emission means of the hair styling appliance 1 when the latter is in operational mode EN can advantageously have a first steam mass flow rate (operational steam mass flow rate) with a symmetrically average value at least equal to 0.5 g / min (i.e., approximately 8.33 x 10 -6 kg / s), preferably between 0.5 g / min and 3 g / min (i.e., between approximately 8.33 x 10 -6 kg / s and 5.10' 5 kg / s), preferably still between 0.5 g / min and 1.1 g / min (i.e. between approximately 8.33 x 10⁻¹¹ 6 kg / s and approximately 1.83 x 10' 5 kg / s), and for example approximately equal to 0.8 g / min (i.e. about 1.33 x 10⁻¹¹) 5kg / s). As explained previously, the first and second mass flow rates DN are advantageously adjusted by selecting the corresponding first and second values ​​UN, UT of the electric motor 62's supply voltage. Such average steam mass flow rates are indeed well-suited for effective steam styling, brushing, detangling, and / or straightening of hair. Furthermore, these average first mass flow rates DN ensure excellent liquid autonomy for the device 1, eliminating the need for a large and therefore bulky tank 60 or for refilling the tank 60 during a single use of the device 1. This improves user comfort.

[0059] As illustrated in Figures 6 and 7, in the operational mode EN, the average (non-zero) value of the feed mass flow rate D is advantageously constant and equal to the average value of the first feed mass flow rate DN, for the entire duration during which the control system 8 commands the effective implementation of the operational mode EN. Also as illustrated in Figures 6 and 7, the control system 8 is advantageously configured to control, in the operating mode Operational mode EN, a continuous and uninterrupted supply of liquid to the vaporization device 5 via the pump 61, throughout the entire duration of the effective implementation of operational mode EN. As such, as in the example of Figures 6 and 7, the control system 8 may be designed and configured to maintain a constant electrical supply to the electric motor 62 throughout the duration of operational mode EN, with a value of the electrical supply voltage U substantially equal to the aforementioned first value UN of electrical voltage.However, it is still conceivable that the control system 8 is designed and configured to maintain constantly, throughout the operational mode EN, an electrical supply to the electric motor 62 according to a value of the electrical supply voltage U which differs over time, i.e. for example according to the said first value UN of electrical voltage, then according to another value UN of electrical voltage (different from the said first value UN of electrical voltage, and preferably also different from the said value UT of electrical voltage).

[0060] In order to further optimize the aforementioned "forced priming" effect of steam generation by the vaporization device 5, and advantageously the effect of generating an initial steam jet in the form of a vapor cloud particularly noticeable to the user, the average value of the second mass feed flow rate DT is preferably between 120% and 1000% of the respective average value of the first mass feed flow rate DN. Even more preferably, the average value of the second mass feed flow rate DT is between 150% and 300%, and for example equal to 150%, of the respective average value of the first mass feed flow rate DN.This makes it possible, on the one hand, to limit the risk of ejection by the device 1 of drops of hot liquid, and therefore dangerous for the user, under the effect of insufficient vaporization of said liquid and, on the other hand, to make the operation of the liquid supply device 6 more reliable, in particular by limiting the risk of scaling of the vaporization chamber 50.

[0061] Preferably, the average value of the second mass flow rate DT is between 0.6 g / min and 5 g / min (i.e., between 1.10' 5 kg / s and approximately 8.33 x 10 -5 kg / s), preferably between 1 g / min and 2.5 g / min (i.e., between 1.67 x 10 -5 kg / s and approximately 4.17 x 10' 5 kg / s), and for example approximately equal at 1.2 g / min (i.e. 2.10' 5kg / s). This is particularly advantageous when the average value of the first mass flow rate DN is between 0.5 g / min and 3 g / min, preferably between 0.5 g / min and 1.1 g / min, and for example equal to 0.8 g / min, as envisaged above.

[0062] As illustrated in Figures 6 and 7, in the transient operating mode ET, the non-zero average value of the feed mass flow rate D is advantageously constant and equal to the average value of the second feed mass flow rate DT, for the entire duration during which the control system 8 provides effective power to the electric motor 62 during the operational mode EN. In other words, the control system 8 is advantageously configured to control the power supply to the electric motor 62 only according to the second voltage value UT, so that the pump 61 supplies liquid to the vaporization device 5 only according to the second feed mass flow rate DT.As illustrated in Figures 6 and 7, the control system 8 is advantageously configured to control, in the transient operating mode ET, a continuous and uninterrupted liquid supply to the vaporization device 5. According to this preferred variant, the control system 8 is therefore advantageously configured so that, when controlling the actual power supply to the electric motor 62 (i.e., U non-zero), it continuously and uninterruptedly controls the power supply to the electric motor 62 according to the second value UT of the electrical voltage (and therefore not sequentially). Thus, the liquid supply to the vaporization device 5 according to the second mass flow rate DT is therefore a single, all-encompassing flow, and not a fractional, sequential one.The two additional preferred features mentioned above, taken independently or preferably in combination, contribute in particular to simplifying the implementation of the transient operating mode ET and to optimizing the aforementioned "forced initiation" effect of the generation of vapor by the vaporization device 5, as well as advantageously the effect of generating an initial vapor jet in the form of a cloud particularly detectable visually by the user.

[0063] It is preferable that the liquid supply duration of the vaporization device 5, according to the second mass flow rate DT, be chosen to be sufficiently short in relation to the value of the second mass flow rate DT and the volume and / or temperature of the vaporization chamber 50 (and therefore its capacity to vaporize a greater or lesser quantity of liquid in a given time) to avoid saturation of the vaporization chamber 50, which could lead to the emission of a jet of scalding liquid droplets during the transient operating mode ET. Accordingly, it is preferable that the control system 8 be configured so that, in said transient operating mode ET, the electric motor 62 is supplied according to said second value UT of electrical voltage for a transient supply duration dT of a value between 1 s and 120 s, preferably between 10 s and 30 s, and for example equal to 15 s.Thus, in the transient operating mode ET, the vaporization device 5 is preferentially supplied with liquid for a transient supply duration dT of a value substantially between 1 s and 120 s, preferably between 10 s and 30 s, and for example, equal to 15 s. This is particularly advantageous when the liquid supply to the vaporization device 5 is continuous over time, according to an average value of the second mass flow rate DT preferably between 0.6 g / min and 5 g / min, preferably between 1 g / min and 2.5 g / min. Such a configuration is particularly well suited for a vaporization chamber 50 of conventional dimensions used in portable steam hair styling tools such as hairbrushes, straightening brushes, detangling brushes, or flat irons.

[0064] Advantageously, the control system 8 is configured to implement, during said transient operating mode AND: - a main sub-mode (or "sub-regime") AND P , wherein the electric motor 62 is powered according to said second value UT of electrical voltage so that the pump 61 supplies liquid to the vaporization device 5 according to said second mass flow rate DT, in accordance with what has been described previously, and - a preheating sub-mode (or "sub-regime") ETC, prior to said main sub-mode AND P , during which the vaporization device 5 is gradually brought to a predefined temperature enabling the vaporization of the liquid, of which the value is preferably between 100 °C and 180 °C, preferably still between 105 °C and 150 °C, and for example substantially equal to F at 130 °C.

[0065] During the preheating sub-mode ETC, the vaporization device 5 is advantageously not supplied with liquid, as the electric motor 62 driving the pump 61 is not electrically powered. The control system 8 is advantageously connected to the first heating element 51 of the vaporization device 5 in order to control a gradual increase in the temperature of the latter, and in particular of the vaporization chamber 50, until a sufficiently predefined temperature value is reached (typically greater than or equal to 100 °C in the case of water, and preferably within the aforementioned preferred ranges or equal to the value) to cause immediate vaporization of the liquid when it is subsequently introduced into the vaporization chamber 50 during the main sub-mode ET POptionally, the predefined preheating temperature of the vaporization device 5 may be chosen to be higher than the operating temperature of the vaporization device 5 during the operational mode EN, so as to promote a more intense, more rapid vaporization of the liquid during the main sub-mode ET P and / or so as to take into account a possible cooling phenomenon of the vaporization device 5 under the effect of the liquid supply during the main sub-mode AND PAlternatively, and although less preferable in terms of design ease and operational reliability of device 1, it is conceivable that such vaporization temperature control of the vaporization device 5 might not be controlled by the control system 8, but for example by another separate system, and that the control system 8 might not be configured to implement such a preheating sub-mode ETC

[0066] The control system 8 is more preferably configured to automatically control a transition from said preheating sub-mode ETC to said main sub-mode ET Pbased on at least one of the following criteria: once the preset temperature value is reached and / or upon the expiration of a preset preheating time, and more preferably once said preset temperature value is reached. The transition from the ETC preheating sub-mode to main sub-mode AND PThis process is therefore preferably carried out automatically, without any positive intervention from the user. This ensures that the device 1 is available for use without the user having to take any action. The device 1 may thus include, for example, a temperature probe arranged in contact with the vaporization chamber 50 of the vaporizing device 5, and connected to the control system 8 in order to transmit information about the temperature of the vaporization chamber 50 to the latter, and to maintain a power supply to the first heating device 51 until the predefined temperature value is reached. Alternatively or additionally, the control system 8 may include, for example, an internal clock to maintain a power supply to the first heating device 51 at least until the expiry of the predefined preheating time.The predefined preheating time may depend on certain technical characteristics of the device 1 (electrical power, size of the vaporization device 5, for example), and is obviously chosen to be sufficient to allow the predefined temperature to be reached. Typically, the preheating time, whether predefined or not, is advantageously between 10 and 60 seconds, and for example, 45 seconds, although this range and value are not, of course, limiting.

[0067] Optionally, the control system 8 can be advantageously configured: - to implement, during said transitional operating mode AND and at the end of said main sub-mode AND P, a sub-mode (or "sub-regime") of timing En during which the electrical power supply to the electric motor 62 is interrupted (zero electrical voltage U), so that the liquid supply to the vaporization device 5 is therefore interrupted, - then to automatically control the transition from the timing sub-mode Eît (and therefore from the transient operating mode ET) to the operational operating mode EN, and thus automatically control the electrical supply of the electric motor 62 according to said first value UN of electrical voltage, so as to control the liquid supply of the vaporization device 5 according to said first mass flow rate DN.

[0068] In other words, the transient operating mode ET then advantageously concludes, in this case, with the implementation of a specific sub-operating mode during which the electric motor 62 is not electrically powered (U = 0 V) ​​and the vaporization device 5 is therefore not supplied with liquid (D = 0 g / min). The implementation of such a time-delay sub-mode Eît can prove beneficial, depending in particular on the choice of the average value of the second mass flow rate DT and the sizing of the vaporization device 5, in order to allow the latter to finish vaporizing the liquid and / or to discharge the vapor at the end of the main sub-mode ET if necessary, and thus avoid saturation of the vaporization chamber 50 which could degrade its performance, or even the emission of a jet of hot liquid droplets at the moment the operational operating mode EN is engaged.Furthermore, insofar as "supercharging" (second value UT of electrical voltage, second mass flow rate DT of supply) can cause a drop in the temperature of the vaporization device 5, the implementation of such a timing sub-mode E™ can advantageously allow the time necessary for the vaporization device 5 to gradually return its temperature to said predefined temperature value (or to another predefined target temperature value, in the event that the predefined temperature value of the vaporization device 5 during the operational mode EN differs from the predefined temperature value to be reached during the preheating sub-mode ETC).

[0069] According to a principle similar to that described above with regard to the preheating sub-mode ETC, the control system 8 can thus be advantageously configured to automatically control the transition from the transient operating mode ET to the operational operating mode EN according to at least one of the following criteria: once a predefined target value of the temperature of the vaporization device 5 is reached (using a temperature probe, for example) and / or upon the expiry of a predefined pause time (using an internal clock, for example).

[0070] Advantageously, the said first value UN of electrical voltage, according to which the electric motor 62 is supplied in the operational mode EN, is substantially equal to the value U nO m of nominal operating electrical voltage of the electric motor 62 (UN = U nO m). This presents several here Notable advantages. On the one hand, such a choice is favorable for the service life of the electric motor 62, and therefore for the reliability of the steam emission means of the hair styling appliance 1, insofar as the operational mode EN corresponds to an operating mode of the hair styling appliance 1 in which the electric motor 62 is required to operate for the longest period. On the other hand, in the particular case where the control system 8 is configured to implement the aforementioned timing sub-mode E-rt in which the power supply to the electric motor 62 is interrupted, the fact that the first value UN of the electrical voltage is chosen to be substantially equal to said value U nOThe nominal electrical voltage (m) ensures that the electric motor 62 restarts instantly every time when supplied with the first electrical voltage value UN. This might not always be the case if the first electrical voltage value UN were chosen to be substantially equal to the aforementioned value U. nO m of nominal electrical voltage, so that the reliability of the steam generation function of the hair styling appliance 1 could be degraded.

[0071] Consequently, the second voltage value UT, according to which the electric motor 62 is supplied in the transient operating mode ET, is therefore advantageously (strictly) greater than the nominal operating voltage value Unom of the electric motor 62. This does not pose any particular problem with regard to starting the electric motor 62. Furthermore, given that the transient operating mode ET is a temporary operating mode, which is advantageously not intended to be implemented for a long period compared to the respective implementation time of the operational operating mode EN, supplying the electric motor 62 with a voltage value UT greater than its nominal voltage value Unom has only a minimal, if not negligible, impact on the service life of the electric motor 62.

[0072] For example, it is advantageously possible to implement, as in the example of Figures 6 and 7 which will be described below, a permanent magnet brushed DC electric motor 62 having a nominal operating voltage Unom of +3.3 V DC, alternately controlled by the control system 8 according to a first value UN of the electrical voltage +3.3 V DC power supply ( / .e. UN = Unom) and according to a second value UT of +5.0 V DC electrical supply voltage.

[0073] Figures 6 and 7 schematically illustrate, in graphical form, the same example of a configuration for the control system 8 of a hair styling appliance 1 according to the invention. In this example, the control system 8 is configured so that once the appliance 1 is switched on (twt), it automatically enters the following positions: - from to: in the ETC preheating sub-mode, to gradually bring the vaporization chamber 50 of the vaporization device 5 to a predefined vaporization temperature of the liquid (water), for example equal to 130 °C, and this in a preheating time of 45 s (ti = to + 45 s). The electric motor 62 is not powered (U = 0 V DC, figure 6), and the liquid supply flow rate of the vaporization device 5 is zero (D = 0 g / min, figure 7); - from ti: in the main AND sub-mode P, during which the electric motor 62 is supplied according to a second value UT of electric voltage of +5.0 V direct (figure 6), so that the vaporization device 5 is supplied with liquid by the pump 61 continuously, according to a constant average value of second mass flow rate DT of 1.2 g / min, for a transient supply time dT of 15 s (t2 = ti + 15 s = to + 60 s, abstracting from possible edge effects in terms of mass flow rate visible in figure 7); - from t2: in the ETI timing sub-mode, in which the power supply to the electric motor 62, and therefore the liquid supply to the vaporization device 5, are interrupted (U = 0 V continuous, figure 5; D = 0 g / min, figure 6) for 5 s (ts = t2 + 5 s = to + 65 s); - then from ts: in the operational mode EN, in which the electric motor 62 is continuously supplied with a first voltage value UN of +3.3 V DC, corresponding here to the nominal operating voltage value Unom of the electric motor 62 (Figure 6). The vaporization device 5 is thus continuously supplied with liquid at a constant average first mass flow rate DN of 0.8 g / min (Figure 7). Throughout the duration of the operational mode EN, the vaporization device 5 is maintained at a predefined liquid vaporization temperature, for example equal to 130 °C.

[0074] The aforementioned electrical voltages can advantageously be measured using a voltmeter, such as those commonly available commercially, or any other suitable device for measuring an electrical voltage (or "electrical potential difference") between two points. Typically, electrical voltage measurements are taken at the supply terminals of the electric motor 62. The aforementioned mass flow rates DN and DT can advantageously be determined by calculating the mass difference of the tank 60 over a predetermined period in transient operating mode ET, and respectively in operational operating mode EN. In other words, weighing and time measurement are advantageously used to determine the mass flow rates.The mass and mass difference of tank 60 can be easily and accurately determined using common weighing instruments by performing several measurements and averaging the results. In practice, tank 60, filled with liquid (typically water), is weighed. The balance is then tareed before removing tank 60 from the weighing platform. After the test (instrument 1 operating in transient mode ET, or operational mode EN, respectively, for a predetermined duration), tank 60—now containing less water—is weighed again on the already tareed balance. This allows the weight / mass difference before and after the test to be measured as a negative value. Naturally, a balance suitable for differential weighing, capable of measuring a negative differential value, is used in this case, as is the case with most available laboratory balances.While the use of differential weighing as described above is particularly simple and practical, it is certainly not the only way to determine mass flow rate, and methods using other types of sensors can be employed. Furthermore, it should be noted that for a liquid such as water, whose density is known and constant, a mass measurement reflects a volume measurement. Consequently, a measurement of the mass of liquid water displaced by a pump in a given time (mass per unit time) is also equivalent to a measurement of the pump's flow rate (volume per unit time). In cases where the transient operating mode ET includes one or both of the ETC preheating sub-mode and E™ timing sub-mode described previously, one... will advantageously focus on excluding from the measurements the time periods corresponding to the implementation of these specific sub-modes, so as to retain only a measurement relating to the main sub-mode AND P .

[0075] Preferably, in the operational mode EN, the heating element 4 intended to come into contact with the hair has a first surface temperature (i.e., a surface temperature) of at least 110 °C. Even more preferably, in the operational mode EN, the value of this first surface temperature of the heating element 4 is at least 120 °C, and advantageously is between 120 °C and 200 °C. Even more preferably, in the operational mode EN, the value of this first surface temperature is between 130 °C and 170 °C, preferably between 140 °C and 160 °C, for example, substantially 150 °C.In a particularly preferential way, quite remarkable results in particular in terms of hair beautification, and more particularly in terms of reducing defects and improving shine, can be obtained when, in the operational mode EN, the value of said first surface temperature is equal to 150 °C ± 20 °C, preferably 150 °C ± 10 °C, in association with a first mass flow rate of vapor whose average value is equal to 0.8 g / min ± 0.3 g / min (i.e. about 1.33 x 10⁻³). 1 kg / s ± 5.10' 5 kg / s), and therefore advantageously in association with a first mass feed flow rate DN whose average value is symmetrically equal to 0.8 g / min ± 0.3 g / min (i.e. approximately 1.33 x 10⁻¹¹). 1 kg / s ± 5.10' 5 kg / s).

[0076] Advantageously, the control system 8 can also be configured to control, throughout the entire duration of the transient operating mode AND OR only during the preheating sub-mode ETC provided above, a progressive increase in the first surface temperature of the heating element 4, so that, when the device is subsequently in the operational operating mode EN, the value of the first surface temperature of said heating element 4 is at least equal to 110 °C, and preferably within the aforementioned preferred value ranges.

[0077] Preferably, the brush bristles 7 that protrude from the front face 3A of the head 3 include at least: - heating points 70 (Figures 1, 3 and 4), which contribute to forming the heating element 4, that is to say that said heating element 4 advantageously includes the heating points 70, and is preferably formed by the heating points 70, and - steam spikes 71 each incorporating a steam ejection orifice 710 connected to a steam source, which is advantageously formed by the vaporization device 5 and the associated supply device 6 described above.

[0078] The steam spikes 71 thus contribute preferentially to forming the steam emission means. To this end, and as previously explained, each steam ejection orifice 710 is advantageously in fluidic communication with the interior of the vaporization chamber 50 via the channeling device 52. The steam spikes 71 thus assume, in addition to their mechanical brushing function, a steam spraying function; that is to say, each steam spike 71, with its steam ejection orifice 710, advantageously forms a steam projection nozzle (preferably for water vapor). Thus, thanks in particular to the steam bristles 71, the mechanical treatment of the hair, under the effect of a resistive effort generated by the hair against the steam bristles 71, is advantageously combined with a fluidic treatment of the hair (steam supply via the steam ejection orifice 710 of the steam bristles 71).The term "combined" here refers to the simultaneous application of both mechanical and fluidic treatments to the same area of ​​hair. Thus, a single section of hair undergoes both a fluidic and a mechanical treatment simultaneously. This results in a combined and concentrated "double" action on the same area of ​​hair. This increases the treatment's effectiveness and delivers excellent results in terms of styling, beautification, and hair care, while minimizing the number of passes of the styling tool against the hair.

[0079] In a particularly advantageous manner, the surface temperature of the heating points 70 corresponds to the aforementioned first surface temperature of the heating element 4, the value of which in operational mode EN is advantageously at least equal to 110 °C, while the steam flow (steam flow The operational steam, whose initial mass flow rate is advantageously at least 0.5 g / min, escapes through the orifices 710 of the steam bristles 71. This embodiment is particularly advantageous because it allows for the optimal and highly effective application of thermomechanical steam treatment to the hair. The use of bristles 70, 71 to heat and diffuse the steam, in addition to their natural brushing function, allows for optimal steam diffusion within the hair strands while ensuring optimal heat exchange.

[0080] Preferably, the steam bristles 71 also act as heating bristles, in addition to their steam diffusion function. In other words, the steam bristles 71 then advantageously contribute to forming both the heating element 4 and the steam emission means. Thus, thanks to said steam bristles 71, the mechanical treatment of the hair (under the effect of a resistive force generated by the hair against the steam bristles 71) is, even more advantageously, combined not only with a fluidic treatment of the hair (steam supply via the steam ejection orifice 710 of the steam bristles 71 contributing to forming the steam emission means as mentioned previously), but also with a thermal treatment of the hair (heat supply by the steam bristles 71 contributing to forming the heating element 4).Thus, a single section of hair undergoes simultaneous, or concurrent, mechanical, fluid, and thermal treatments. This results in a combined and concentrated "triple" action on the same area of ​​hair. This further enhances the effectiveness of the hair treatment provided by the styling tool 1, leading to even better results in terms of styling, beautification, and hair care, while further minimizing the number of passes required with the styling tool 1 against the hair.

[0081] The invention also relates, as such, to a method for producing steam by a steam hair styling device 1 comprising a liquid vaporization device 5 for generating, from a liquid (typically water), a stream of steam advantageously intended to be directed towards and onto the hair of a user, a pump 61 for supplying liquid to said vaporization device 5, and an electric motor 62 for driving said pump 61. Typically, the pump 61 and the motor Electrical components 62 are included in a power supply device 6, which is part of the hair styling appliance 1, to supply liquid to the vaporizing device 5. Advantageously, the hair styling appliance 1 involved in the method of the invention is a hair styling appliance 1 according to the invention as described in detail above. In other words, the method according to the invention is advantageously implemented using a hair styling appliance 1 according to the invention. Consequently, the description of the hair styling appliance 1 (particularly with regard to its design, operation, effects, and associated technical advantages) above applies mutadis mutandis to said method.

[0082] According to the invention, said method comprises: - a first operating stage of the hair styling device 1, during which said electric motor 62 is supplied with a first (non-zero) value UN of electrical voltage so that the pump 61 supplies liquid to the vaporization device 5 according to a first (non-zero) mass flow rate DN, and - a second stage of operation of the hairdressing device 1, during which said electric motor 62 is supplied according to a second value UT (non-zero) of electrical voltage different from said first value UN of electrical voltage so that the pump 61 supplies liquid to the vaporization device 5 according to a second mass supply flow rate DT (non-zero) which is different from said first mass supply flow rate DN.

[0083] The technical advantages associated with the implementation of these two operating steps of the hair styling device 1 are advantageously at least those already discussed previously in connection with the hair styling device 1 of the invention.

[0084] According to a particular, non-limiting embodiment, - said first operating stage is an operational operating stage of the hairdressing appliance 1, during which the pump 61 therefore supplies liquid to the vaporization device 5 according to said first supply mass flow rate DN ("normal mass flow rate" or "operational mass flow rate"), and - said second operating step is a transitional operating step of the hair styling appliance 1, prior to said operating step operational, and during which the electric motor 62 is powered according to said second value UT of electrical voltage, which is greater (in the sense of "strictly greater") than said first value UN of electrical voltage. During said transient operating stage, the pump 61 thus supplies liquid to the vaporization device 5 according to said second mass flow rate DT, which is then greater than said first mass flow rate DN.

[0085] Said operational operating stage and said transient operating stage correspond advantageously respectively to the operational operating mode EN and the transient operating mode ET as the latter have been described previously.

[0086] During the operational phase, the vaporization device 5 is advantageously at a temperature that allows the liquid to vaporize, that is, at a temperature whose value is at least equal to the vaporization temperature (T vap ) of the liquid in question. The temperature of the vaporization device 5 during the operational phase is preferably substantially constant and whose (predefined) value is preferably between 100 °C and 180 °C, preferably further between 105 °C and 150 °C, and for example substantially equal to 130 °C. Conversely, during the transient phase, the vaporization device 5 is advantageously at a temperature enabling the vaporization of the liquid, which is preferably substantially constant and whose (predefined) value is preferably between 100 °C and 180 °C, preferably further between 105 °C and 150 °C, and for example substantially equal to 130 °C.

[0087] Advantageously, the transition from the transitional operating stage to the operational operating stage is carried out automatically.

[0088] Preferably, and for the effects and advantages (the burst of a significant jet of steam) already described previously in connection with the hair styling device 1 according to the invention, - the hair styling device 1 emits an operational steam flow according to a first mass flow rate of steam ("operational mass flow rate of steam") during the step of operational functioning, advantageously therefore under the effect of the electrical supply of the electric motor 62 according to said first value UN of electrical voltage (and therefore under the effect of the liquid supply of the vaporization device 5 according to said first mass supply flow rate DN), - the hair styling device 1 previously emitting a transient vapor flow ("initial vapor flow") according to a second mass flow rate of vapor ("transient mass flow rate of vapor") during the transient operating stage, advantageously therefore under the effect respectively of the electrical supply of the electric motor 62 according to said second value UT of electrical voltage (and therefore under the effect of the liquid supply of the vaporization device 5 according to the second mass flow rate of supply DT), said second mass flow rate of vapor being greater than the first mass flow rate of vapor.

[0089] Preferably, the first value UN of electrical voltage is chosen such that the average value of the first mass flow rate of vapor is at least equal to 0.5 g / min (i.e., approximately 8.33 x 10 -6 kg / s), preferably between 0.5 g / min and 3 g / min (i.e., between approximately 8.33 x 10 -6 kg / s and 5.10' 5kg / s), preferably still between 0.5 g / min and 1.1 g / min (i.e. between approximately 8.33 x 10⁻¹¹ 6 kg / s and approximately 1.83 x 10' 5 kg / s), and for example equal to 0.8 g / min (i.e. approximately 1.33 x 10⁻¹¹) 5 kg / s). Preferably, the average value of the second steam mass flow rate is between 120% and 1000%, and even more preferably between 150% and 300%, of the respective average value of the first steam mass flow rate. Preferably, the second UT value of the electrical voltage is chosen such that the average value of the second steam mass flow rate is between 0.6 g / min and 5 g / min, i.e., between 1.10⁻¹⁰⁴ 5 kg / s and approximately 8.33 x 10' 5 kg / s), preferably between 1 g / min and 2.5 g / min (i.e., between 1.67 x 10⁻¹² 5 kg / s and approximately 4.17 x 10' 5 kg / s), and for example approximately equal to 1.2 g / min (i.e., 2.10' 5 kg / s).

[0090] In a particularly advantageous way, the vapor in the transient vapor stream is more heavily loaded with droplets and / or microdroplets of liquid than the vapor in the operational vapor stream.

[0091] Preferably, said transitional operating step includes: - a main substage, in which the electric motor 62 is powered according to said second value UT of electrical voltage so that the pump 61 supplies liquid to the vaporization device 5 according to said second mass flow rate DT, and - a preheating sub-step, prior to said main sub-step, during which the vaporization device 5 is progressively brought to a predefined temperature enabling the vaporization of the liquid, the value of which is preferably between 100 °C and 180 °C, preferably still between 105 °C and 150 °C, and for example substantially equal to 130 °C.

[0092] Advantageously, the main substage and the preheating substage correspond respectively to the main AND sub-mode P and to the ETC preheating sub-mode as described previously. Advantageously, the electric motor 62 is not electrically powered during the preheating sub-step, so that the pump 61 does not supply liquid to the vaporization device 5 during the preheating sub-step. Preferably, the transition from the preheating sub-step to the main sub-step is carried out automatically, based on at least one of the following criteria: once the predefined temperature value is reached and / or upon the expiration of a predefined preheating time, and preferably again once said predefined temperature value is reached.

[0093] Optionally, the transient operating stage of the hair styling appliance 1 may advantageously include, following the main substage, a timing substage in which the power supply to the electric motor 62 is interrupted, thereby interrupting the liquid supply to the vaporizing device 5. The transition from the timing substage to the operational stage is advantageously automatic. Advantageously, this timing substage corresponds to the timing sub-mode E™ as described previously. Advantageously, the transition from the timing substage to the operational stage is automatic based on at least one of the following criteria: once a predefined target temperature value of the vaporizing device 5 is reached and / or upon the expiration of a predefined pause time.

[0094] It should be noted for the avoidance of doubt that the terms "first" and "second" used in this description preferably have no ordinal or cardinal connotation; that is to say, they do not imply any notion of order, quantity, or any categorization of the elements, components, sizes, steps, etc., to which these terms are attached. Their sole purpose here is to facilitate understanding of the invention by allowing for the differentiation of certain technical characteristics of the invention. POSSIBILITY OF INDUSTRIAL APPLICATION

[0095] The invention finds its industrial application in the design, manufacture and use of hairdressing appliances, for example for domestic use, intended to ensure the shaping, and / or beautification and / or improvement of the health of hair.

Claims

CLAIMS Steam hairdressing appliance (1) comprising a liquid vaporization device (5) for generating, from a liquid, a flow of steam, a pump (61) for supplying liquid to said vaporization device (5), an electric motor (62) for actuating said pump (61), and a control system (8) designed and configured to control the power supply to the electric motor (62) and alternately supply the latter at least - according to a first value (UN) of electrical voltage so that the pump (61) supplies liquid to the vaporization device (5) according to a first mass supply flow rate (DN), and - according to a second electrical voltage value (UT) different from said first electrical voltage value (UN) so that the pump (61) supplies liquid to the vaporization device (5) according to a second mass supply flow rate (DT) which is different from said first mass supply flow rate (DN). Hairdressing appliance (1) according to the preceding claim, in which the control system (8) comprises a regulating member (81) for regulating the electrical supply voltage of the electric motor (62) from a predefined input electrical voltage value (UE), and a microcontroller (82) for alternately emitting to the regulating member (81) the electrical supply voltage - a first control signal (Si) for controlling the power supply of the electric motor (62) according to the first electrical voltage value (UN), and - a second control signal (S2) for controlling the power supply of the electric motor (62) according to the second electrical voltage value (UT). Hairdressing appliance (1) according to the preceding claim, wherein said regulating member (81) of the electrical supply voltage comprises at least one linear voltage regulator (811), which is preferably a linear regulator with low voltage drop. Hairdressing appliance (1) according to any one of the preceding claims, wherein said pump (61) is a peristaltic pump. Hairdressing appliance (1) according to any one of the preceding claims, wherein the average value of the first feed mass flow rate (DN) is at least equal to 0.5 g / min, preferably between 0.5 g / min and 3 g / min, more preferably between 0.5 g / min and 1.1 g / min, and for example equal to 0.8 g / min. Hairdressing appliance (1) according to any one of the preceding claims, wherein the average value of the second feed mass flow rate (DT) is between 0.6 g / min and 5 g / min, preferably between 1 g / min and 2.5 g / min, and for example substantially equal to 1.2 g / min. Hairdressing appliance (1) according to any one of the preceding claims, wherein the control system (8) is designed and configured to implement: - an operational operating mode (EN), in which the electric motor (62) is supplied according to said first electrical voltage value (UN), and - a transient operating mode (ET) prior to said operational operating mode (EN), in which the electric motor (62) is powered according to said second electrical voltage value (UT), which is greater than said first electrical voltage value (UN). Hairdressing appliance (1) according to the preceding claim, in which the first electrical voltage value (UN) is equal to a nominal operating electrical voltage value (Unom) of the electric motor (62). Hairdressing appliance (1) according to any one of claims 7 and 8, in which the control system (8) is configured so that, in said transient operating mode (ET), the electric motor is powered according to said second electrical voltage value (UT) during a power supply duration transient (CIT) of a value between 1 s and 120 s, preferably between 10 s and 30 s, and for example equal to 15 s. Hairdressing appliance (1) according to any one of claims 7 to 9, in which the control system (8) is configured to automatically control a change from the transient operating mode (ET) to the operational operating mode (EN). Hairdressing appliance (1) according to any one of claims 7 to 10, characterized in that the control system (8) is configured to implement, during said transient operating mode (ET): - a main sub-mode (AND P ), wherein said electric motor (62) is powered according to said second electrical voltage value (UT) so that the pump (61) supplies liquid to the vaporization device (5) according to said second supply mass flow rate (DT), and - a preheating sub-mode (ETC), prior to said main sub-mode (ET P ), during which the vaporization device (5) is gradually brought to a predefined temperature allowing the vaporization of the liquid, the value of which is preferably between 100°C and 180°C, more preferably between 105°C and 150°C, and for example substantially equal to 130°C. Hairdressing appliance (1) according to the preceding claim, characterized in that the control system (8) is configured to automatically control a change from the preheating sub-mode (ETC) to the main sub-mode (ET P) depending on at least one of the following criteria: once the predefined temperature value is reached and / or upon expiry of a predefined preheating time, and preferably once said predefined temperature value is reached. Hairdressing appliance (1) according to claim 10 and any one of claims 11 and 12, wherein the control system is configured: - to implement, during the transient operating mode (ET) and at the end of the main sub-mode (ET P ), a time-delay sub-mode (ETI) during which the electrical supply to the electric motor (62) is interrupted, - then to automatically control the transition from the time-delay sub-mode (E-rt) to the operational operating mode (EN). Method for producing steam by a steam hairdressing appliance (1) comprising a liquid vaporization device (5) for generating, from a liquid, a flow of steam, a pump (61) for supplying liquid to said vaporization device (5), an electric motor (62) for actuating said pump (61), said method comprising: - a first step of operation of the hairdressing appliance (1), during which said electric motor (62) is supplied according to a first electrical voltage value (UN) so that the pump supplies liquid to the vaporization device (5) according to a first mass supply flow rate (DN), and - a second step of operation of the hairdressing appliance (1), during which said electric motor (62) is powered according to a second electrical voltage value (UT) different from said first electrical voltage value (UN) so that the pump (62) supplies liquid to the vaporization device (5) according to a second mass supply flow rate (DT) which is different from said first mass supply flow rate (DN). Method according to the preceding claim, in which: - said first operating step is an operational operating step of the hairdressing appliance (1), and - said second operating step is a transient operating step of the hairdressing appliance (1), prior to said operational operating step, and during which the electric motor (62) is powered according to said second electrical voltage value (UT), which is greater than said first electrical voltage value (UN). Method according to the preceding claim, in which the hairdressing appliance (1) emits an operational steam flow according to a first steam mass flow rate during the operational operating step, said hairdressing appliance (1) previously emitting a transient steam flow according to a second steam mass flow rate during the transient operating step, the second steam mass flow rate being greater than the first steam mass flow rate.

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