FR3139444A1 - STEAM HAIR STYLING APPLIANCE WITH PUMP MOTOR CONTROLLED ACCORDING TO DIFFERENT VOLTAGE VALUES - Google Patents

Abstract

Steam hair styling apparatus with pump motor controlled according to different voltage valuesThe invention relates to a steam hair styling apparatus comprising a liquid vaporization device, a pump, an electric motor for operating the pump, and a control system for alternately supply electric motor at least according to a first value (UN) of electrical voltage so that the pump supplies liquid to the vaporization device according to a first mass supply flow rate, and according to a second value (UT) of electrical voltage different from the first value (UN) of electrical voltage so that the pump supplies liquid to the vaporization device at a second mass supply flow rate different from the first mass supply flow rate.Hairdressing appliances.Figure for the abstract: Fig. 6.

Description

STEAM HAIR STYLING APPLIANCE WITH PUMP MOTOR CONTROLLED ACCORDING TO DIFFERENT VOLTAGE VALUES

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

The invention relates more specifically to a steam hairdressing device, comprising a liquid vaporization device for generating, from a liquid, a flow of steam. The invention further relates to a method of producing steam by a steam hairdressing appliance comprising a liquid vaporization device for generating, from a liquid, a flow of steam.

Hairdressing devices are known for subjecting the hair to a flow of water vapor, in association with mechanical and thermal treatment. This thermomechanical steam treatment is for example carried out by means of a brush comprising heating pins carried by a brushing head which is also provided with orifices diffusing steam. This emission of steam, associated with the mechanical action of brushing as well as the thermal action provided by the heating pins, facilitates the styling operation and makes it possible to improve its effectiveness, while preserving, at least to a certain extent. measurement, appearance of the hair.

Although such known devices are generally satisfactory, they nonetheless remain limited in terms of performance and functionalities offered in terms of steam generation. In general, the steam generation function of known devices is limited to the emission by these devices of a steam flow of a single predefined flow rate. The reliability and robustness of the components ensuring the steam generation function are not always optimal.

In addition, the steam generation function of these devices can sometimes be improved. In particular, instabilities in the flow rate of the steam flow generated can sometimes be observed. In addition, the user does not necessarily have any indication that the steam emission means of the device are functional. It is then sometimes difficult for the user to know if the device is really ready to be used or is even simply functional.

The objects assigned to the invention therefore aim to provide a response to the above-mentioned needs and problems, and to propose in particular a new steam hairdressing device having a steam generation function that can be controlled in a more versatile manner, while still being particularly simple, reliable and robust design.

Another object of the invention aims to propose a new hairdressing device having a steam generation function allowing the emission of a flow of steam which can be adapted to the type of hair treatment to be carried out and/or to the type of hair to be treated.

Another object of the invention aims to propose a new hairdressing device having a steam generation function with optimized operation, in particular when starting the device.

Another object of the invention aims to propose a new hairdressing device whose use is particularly intuitive, in particular for a user lacking particular skills in hairdressing.

Another object of the invention aims to propose a new hairdressing device whose use is particularly practical and simple.

Another object of the invention aims to propose a new hairdressing device whose design makes it possible to subject the hair in a particularly effective manner to a flow of steam.

Another object of the invention aims to propose a new hairdressing device which, while making it possible to obtain, easily and quickly, particularly satisfactory styling and hair shaping effects, significantly improves the appearance of the hair. hair, and in particular their shine, as well as their surface condition.

Another object of the invention aims to propose a new process for producing steam by a hairdressing appliance making it possible to give the latter a steam generation function which can be controlled in a more versatile manner, whilst still having a particularly simple design. , reliable and robust.

Another object of the invention aims to propose a new process for producing steam by a hairdressing device making it possible 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 depending on the type of hair to be treated.

Another object of the invention aims to propose a new process for producing steam by a hairdressing device allowing optimized operation of a steam generation function of the hairdressing device, in particular when starting the latter.

Another object of the invention aims to propose a new process for producing steam by a hairdressing device which is particularly simple, practical, effective and easily understandable by the user.

The objects assigned to the invention are achieved using a steam hairdressing device comprising a liquid vaporization device for generating, from a liquid, a flow of steam, 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 of 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 supply 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 at a second mass supply flow rate which is different from said first mass supply flow rate.

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, from a liquid, a flow of steam , a pump for supplying liquid to said vaporization device, an electric motor for operating said pump, said method comprising:
– a first operating step of the hairdressing 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 supply flow rate, and
– a second operating step of the hairdressing appliance, during which said electric motor is powered 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 feed mass flow rate which is different from said first feed mass flow rate.

Other particularities and advantages of the invention will appear and emerge in more detail on reading the description given below, with reference to the appended drawings, given solely by way of illustrative and non-limiting examples, among which:

is a schematic perspective view of a hairdressing device according to the invention, which in this case forms a hairdressing brush;

is a schematic perspective view of the hairdressing apparatus of the , of which cowling elements and elements of the head have been omitted so as to reveal internal design details of the device. Furthermore, a piping element connecting the pump to a vaporization device has been omitted;

is a schematic, exploded view of the device of the . Certain elements of piping and electrical wiring in particular have been omitted;

is a schematic perspective view of the head of the hairdressing appliance of the preceding figures;

schematically illustrates in the form of a diagram a detail of an example of design of a hairdressing device according to the invention.

schematically illustrates in the form of a graph an example of configuration of the system for controlling 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 the time is identified by the letter t on the abscissa and expressed in seconds (s);

schematically illustrates in the form of another graphic the example of configuration of the . 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 second(s).

The invention relates, firstly, to a steam hairdressing appliance 1, that is to say a hairdressing appliance comprising steam emitting means, for subjecting hair to a flow of steam in the frame, in particular, a hairstyle operation of said hair. The hairdressing device 1 according to the invention is preferably portable, that is to say that at least part, and preferably the whole, of the device 1 is designed to be grasped and manipulated by hand. hand. The hairdressing device 1 is preferably a portable electrical device, intended to be connected to the electricity distribution network (alternating current) to be electrically powered. However, it is alternatively possible, without departing from the scope of the invention, for the hairdressing appliance 1 to carry electrical power batteries, possibly rechargeable. The hairdressing appliance 1 is preferably designed for use in a domestic setting, and is intended to ensure shaping of the hair, and/or beautification of the hair and/or improvement of the health of the hair. Preferably, the hairdressing device 1 is designed so that the user uses the hairdressing device 1 on himself, that is to say on his own hair. However, it is perfectly conceivable that the hairdressing appliance 1 is designed for use by the user on the hair of a third person (or other user). Preferably, the hairdressing appliance 1 is intended for use in a domestic setting by a user (woman or man) lacking particular professional hairdressing skills. In the embodiment illustrated in the figures, the hairdressing device 1 constitutes a hairdressing brush. The invention is however not limited to a hairdressing device 1 forming a hairdressing brush, and the hairdressing device 1 can for example constitute a straightening brush, a detangling brush or a straightener, without however being outside the scope of the invention.

As illustrated in the figures, the hairdressing appliance 1 advantageously comprises a handle 2 for manual gripping, which is intended to be grasped by hand, and for example grasped, by the user, to manipulate the hairdressing appliance 1. The handle 2 extends for example longitudinally, along a central longitudinal axis X-X', between a first end from which emerges for example an electrical power cable, and a second opposite end. The hairdressing device 1 advantageously comprises a head 3 for engaging the hair, that is to say 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 carried by the handle 2, and extends for example longitudinally, along said central axis X-X', between a rear end secured 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 which is extended by the head 3, which is advantageously wider than the handle 2 and has for example a generally substantially oblong shape. Preferably and as illustrated, the handle 2 and the head 3 are formed, at least in part, by a single-piece main body, of the box type, for example made of plastic material. The head 3 advantageously has a front face 3A which, as in the embodiment illustrated in the figures, is preferably provided with brushing pins 7 between and against which the hair is intended to be and to move, during use. of the hairdressing appliance 1.

The hairdressing appliance 1 comprises, advantageously included in the steam emission means mentioned above:
– a liquid vaporization device 5 for generating, from a liquid, a flow of vapor, which is advantageously intended to be directed towards and on 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 therefore allow the latter to operate so that it activates the pump 61 to supply liquid to the vaporization device 5.

Preferably, the liquid concerned is water. The term " water " can designate here any liquid containing mainly water (that is to say 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 steam, and thus includes distilled water, running tap water, but also different aqueous solutions containing cosmetic elements, olfactory, etc. The term " vapor " must here be taken in an extensive sense and thus designates indifferently a substance (preferably water) in the gaseous state, or said substance (preferably water) in the liquid state under the form of a mist of droplets and/or microdroplets, or even a mixture of said substance (preferably water) in the gaseous state and of said substance (preferably water) in the state liquid 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 the gaseous state, particles of liquid water suspended in the air, or a mixture of water in the gaseous state and liquid water particles (droplets/microdroplets) suspended in the air.

As in the embodiment illustrated in the figures, the vaporization device 5 advantageously comprises a vaporization chamber 50 provided with a liquid supply 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, within the vaporization chamber 50, the liquid into vapor (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 the Joule effect (for example one or more heating elements, or thermistor(s), with a “Positive Temperature Coefficient” (PTC)), the or the resistive elements being advantageously arranged in contact with the vaporization chamber 50. The vapor outlet 502 is for its part advantageously in fluidic communication, preferably permanent, with the surrounding exterior air, preferably via at least one steam ejection orifice 710, disposed on the side of the front face 3A of the head 3 of the hairdressing appliance 1. For example, the steam ejection orifice(s) 710 is (are) in fluid communication with the interior of the vaporization chamber 50 via a piping device 52 connected on one side to the steam outlet 502 and on the other to at least one orifice 710 d steam ejection.

As in the preferred embodiment illustrated in the figures, the vaporization chamber 50 is advantageously maintained permanently at atmospheric pressure, as envisaged above, which avoids in particular having to resort to an outlet valve, due to the absence of increase in steam pressure within the vaporization chamber 50 and the device 1. Among the advantages of such a design, we can note in particular the absence of risk of overpressure (and therefore the absence of need for have means to prevent or manage such excess pressure), as well as a lower risk of ejection of a stream of steam at too high a temperature likely to damage and/or burn the hair or scalp. Indeed, due to the absence of pressurization of the vaporization chamber 50, the temperature of the water vapor flow advantageously does not exceed 100 ° C. In addition, the speed of the steam flow and the distance traveled by the latter outside the device 1 are limited due to the absence of overpressure, which contributes to limiting the risk of burning the scalp, and therefore to a greater safety for the user.

Advantageously, the aforementioned control system 8 is further designed and configured to control the operation of the vaporization device 5 (and in particular the operation of the first heating device 51 of the latter), and carry the vaporization device 5 (and in particularly the vaporization chamber 50 of the latter) at a temperature whose value is at least equal to the vaporization temperature of the liquid considered. The control system 8 is therefore advantageously electrically connected to the vaporization device 5, and in particular to the first heating device 51 of the latter, in order to control its operation (and therefore to regulate its operating temperature), and thus control the temperature of the vaporization chamber 50 of the vaporization device 5.

Typically, the pump 61 and the electric motor 62 are included in a liquid supply device 6, which comprises the hairdressing appliance 1, to supply liquid to the vaporization device 5. Said liquid supply device 6 comprises preferably, in addition to the pump 61 and the electric motor 62 for actuating the latter, a reservoir 60 for storing a quantity of liquid (preferably liquid water), the pump 61 then being connected in fluidic communication of on the one hand with the reservoir 60, for example via an inlet pipe 63, and on the other hand with the vaporization device 5, for example via an outlet pipe (omitted in the ) connected to the supply inlet 501 of the vaporization chamber 50. The pump 61, the electric motor 62 and the reservoir 60 are preferably carried by the main body of the hairdressing appliance 1, that is to say say arranged in or on said main body, to contribute to the portable nature of the hairdressing appliance 1. The reservoir 60 is for example removable, that is to say it is detachable from the main body of the appliance 1 with a view in particular to its filling, which in particular makes it possible to do without an earth connection for the electrical supply of the device 1. To this end, the tank 60 is preferably substantially at atmospheric pressure. The use of a pump 61 associated with a tank 60 at atmospheric pressure, rather than a pressurized tank associated with a valve, also allows optimal safety of use and increased reliability in terms of flow control. Preferably, the pump 61 is a peristaltic pump, which allows very fine control of low flow rates and guarantees relatively constant flow rates if necessary. Alternatively, a diaphragm pump or other suitable type could be considered, although a peristaltic pump remains preferred. Preferably, as in the embodiment illustrated in the figures, the hairdressing appliance 1 does not have a device for heating the reservoir 60, so that the liquid contained in the latter remains substantially at room temperature when using the hairdressing appliance. hairstyle 1.

In accordance with 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 precisely, to alternately (electrically) supply the latter at least
– according to a first electrical voltage value U _N so that the pump 61, thus actuated by the electric motor 62 rotating at a first rotation speed, supplies liquid to the vaporization device 5 at a first mass supply flow rate D _N , And
– according to a second value U _T of electrical voltage different from said first value U _N 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 the vaporization device 5 according to a second mass feed rate D _T which is different from said first mass feed rate D _N.

By “alternatively powering” is meant here a power supply of the electric motor either according to the first value U _N of electrical voltage, or according to the second value U _T of electrical voltage. The first and second values U _N , U _T of electrical voltage, the first and second rotation speeds, as well as the first and second mass flow rates of supply D _N , D _T , are understood here respectively in the sense of values, speeds and non-zero mass flow rates.

Advantageously, the electric motor 62 is a direct current motor (“CC” electric motor, or “DC” in English), and preferably a brushed direct current motor, and for example a permanent magnet brushed direct current motor. . Such an electric motor has the particular advantage of being of a simple, robust, space-saving and inexpensive design, and is therefore particularly well suited to a portable steam hairdressing appliance, in particular intended for domestic use. The first and second values U _N , U _T of electrical voltage then correspond to values of continuous electrical voltage U. The electric motor 62 can, where appropriate, be an electric gear motor or be mechanically connected to the pump 61 via a reduction gear, so as to best adapt the speed of rotation, as well as the torque supplied, to the pump 61.

The control system 8 is therefore designed and configured to control the electrical supply of the electric motor 62 actuating the pump 61 according to at least two different values U _N , U _T of electrical voltage U, so that the pump 61 thus delivers at the outlet of the liquid according to at least two different mass feed flow rates D _N , D _T. Thus, the control system 8 therefore authorizes an adjustment of the mass flow rate of liquid supply to the vaporization device 5 by the pump 61 which is controlled, in a particularly simple manner, by a modification of the rotation speed of the electric motor 61 d actuation of the pump 61 under the effect of a modification of the value of the electrical voltage U supplying the electric motor 61.

In the specific context of a steam hairdressing appliance 1, such a means for adjusting the mass flow rate of liquid supply based on controlling the value of the electrical voltage U supplying the electric motor 62 proves advantageously more reliable and simple, both in terms of its design and its operation, than a means of regulating the mass supply flow which would alternatively consist of modifying the operating speed of the electric motor 62, supplied according to a single, fixed value , electrical voltage U and by modulating the frequency of the voltage or supply current of the electric motor 62 (typically according to a principle of pulse width modulation (PMI, or “ Pulse Width Modulation ” (PWM) in English) In the preferential case where, as envisaged previously, the electric motor 62 is a brushed direct current motor, the use of frequency modulation of the electrical power supply of the electric motor 62 would be likely to generate a current ripple detrimental to the lifespan of the electric motor 62 and source of losses, in particular by the Joule effect. In addition, the use of frequency modulation of the electrical supply would be likely to generate undesirable electromagnetic pollution (high frequency disturbances), so that it would then be necessary to provide for the implementation of additional filter(s) to protect against this, which would increase the complexity and cost of design and manufacturing of the device 1. Furthermore, such a means of regulating the mass flow rate of liquid supply based on a voltage value control of power supply of the electric motor 62 proves to be much more efficient, reliable and simple, both in terms of its design and its operation, than a means of regulating the mass flow rate of supply which would alternately consist of reducing, mechanically and/or by means of a fluid bypass circuit arranged downstream of the pump and upstream of the variation device, a mass flow of liquid of a single and constant value delivered by the pump, the latter being actuated by an electric motor always rotating at the same speed. Thus, the pump 61 advantageously always operates at the necessary speed and only at this speed, all the energy of the pump 61 is used. This therefore results in energy savings (whether fluidic or electrical) and better reliability of the pump 61.

Thus, thanks to the technical characteristics set out above, the hairdressing appliance 1 according to the invention has a steam generation function which can be controlled and controlled in a particularly versatile manner. The hairdressing appliance 1 can thus advantageously emit a flow of steam according to at least two different (non-zero) mass flow rates of steam, which in particular offers the possibility of adapting the flow of steam emitted to the type of treatment and/or to the type of hair treated with the hairdressing device 1, and/or, as will be explained later, to optimize the operation and in particular the activation of the steam generation function of the hairdressing device 1 , as well as possibly the perception, by the user, of the actual operation of said steam generation function. However, the steam generation function of the hairdressing appliance 1 according to the invention nonetheless remains of a particularly simple, reliable and robust design.

Advantageously, said first electrical voltage value U _N is chosen so that the average value of the first mass feed rate D _N is at least equal to 0.5 g/min ( ie approximately 8.33.10 ^-6 kg/s) , preferably between 0.5 g / min and 3 g / min ( ie between approximately 8.33.10 ^-6 kg / s and 5.10 ^-5 kg / s), more preferably between 0.5 g / min and 1 .1 g / min ( ie between approximately 8.33.10 ^-6 kg / s and approximately 1.83.10 ^-5 kg / s), and for example equal to 0.8 g / min ( ie approximately 1.33.10 ^-5 kg / s). Advantageously, said second value U _T of electrical voltage is chosen so that the average value of the second mass flow rate of supply D _T is between 0.6 g / min and 5 g / min ( ie between 1.10 ^-5 kg / s and approximately 8.33.10 ^-5 kg/s), preferably between 1 g/min and 2.5 g/min ( ie between 1.67.10 ^-5 kg/s and approximately 4.17.10 ^-5 kg/s), and for example substantially equal to 1.2 g/min ( ie 2.10 ^-5 kg/s). It is understood that the choice of the first and second values U _N , U _T of electrical voltage, corresponding to the average values of first and second mass flow rates of supply D _N , D _T which one wishes to obtain, is carried out as a function of the properties 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 the second mass flow rate(s) of supply D _N , D _T , the first and/or the second electrical voltage value U _N may be different depending on the respective characteristics of the electric motor 62 and the pump 61 used.

Advantageously, one of the first value U _N and second value U _T of electrical voltage is substantially equal to a value U _nom of nominal operating electrical voltage of the electric motor 62 actuating the pump 61 ( ie U _N = U _nom or U _T = U _nom ), which makes it possible in particular to optimize and make the operation of the electric motor 62, and therefore of the hairdressing appliance 1, more reliable. The value U _nom of the nominal operating voltage of an electric motor corresponds to the value of the electrical supply voltage of the electric motor for which the electric motor has been specifically designed to operate optimally, in particular in terms of efficiency and lifespan. This value U _name of nominal voltage is generally communicated by its manufacturer and/or mentioned on a label affixed to the electric motor.

According to a variant, the control system 8 comprises a manual selector to allow the user of the hairdressing appliance 1 to directly manually control a change in the electrical power of the electric motor 62 according to one of the first and second U values_NOT,U_Tof electrical voltage according to the other of said first and second U values_NOT,U_Telectrical voltage. Thus, the user can directly adjust, by himself, the mass flow rate of liquid supply to the vaporization device 5, according to the first or the second mass flow rate of supply D_NOT, D_T, and therefore the mass flow rate of the steam flow emitted by the hairdressing appliance 1. According to an alternative variant, the control system 8 is designed and configured to automatically control a change in electrical power supply of the electric motor 62 according to one of the first and second U values_NOT,U_Tof electrical voltage according to the other of said first and second U values_NOT,U_Telectrical voltage. According to this variant, the control system 8 is therefore advantageously devoid of adjustment or selection means, allowing the user to directly manually pass the electrical supply voltage of the electric motor 62 for actuating the pump 61 from the 'one to the other of said first and second U values_NOT,U_Telectrical voltage.

Preferably, as illustrated schematically as an example in , the control system 8 comprises a regulating member 81 of the electrical supply voltage of the electric motor 62 from a value U _E of predefined input electrical voltage, for example delivered by an electrical power supply module 9 of the hairdressing appliance 1, and a microcontroller 82 to transmit alternately towards (that is to say to) the regulating member 81 of the electrical supply voltage
– a first control signal S ₁ for controlling the power supply of the electric motor 62 according to said first electrical voltage value U _N , and
– a second control signal S ₂ for controlling the power supply of the electric motor 62 according to said second electric voltage value U _T.

Advantageously, the hairdressing appliance 1 comprises, as mentioned above, an electrical power supply module 9, which is advantageously embedded in the main body of the appliance 1, and to which the control system 8 is therefore connected to control powering the electric motor 62 from an input electric current delivered by the electric power supply module 9, said input electric current presenting said value U _E of predefined input electric voltage. Advantageously, the electrical power supply module 9 is also intended for the electrical supply of the first heating device 51 of the vaporization device 5, and where appropriate, of a second heating device 40 of a heating element 4 which will be discussed later.

In the case where the hairdressing appliance 1 has electrical power batteries, possibly rechargeable, as a source of electricity (direct current), said electrical power module 9 may include said electrical power batteries. In the preferential case where, as in the example illustrated in the figures, the hairdressing appliance 1 is intended to be connected to the electricity distribution network as a source of electricity (alternating current), the module power supply 9 may include an electrical power cord, as mentioned previously, to connect the power supply module 9 to the electricity distribution network. For example, the electric motor 62 advantageously being a direct current motor, as mentioned above, the electrical power supply module 9 may comprise a rectifier circuit for converting the alternating electrical voltage of the electricity distribution network into an electrical voltage continuous, and a chopper circuit for lowering said direct electrical voltage and thus delivering said value U _E of predefined input electrical voltage. The electrical power supply module 9 is advantageously electrically connected to the regulating member 81 of the electrical supply voltage of the electric motor 62, to deliver to the latter said value U _E of predefined input electrical voltage.

Thus, when the regulating member 81 receives the first control signal S ₁ emitted by the microcontroller 82, the regulating member 81 then supplies the electric motor 62 according to said first value U _N of electrical voltage from said value U _E of predefined input electrical voltage. Alternatively, when the regulating member 81 receives the second control signal S ₂ emitted by the microcontroller 82, the regulating member 81 then supplies the electric motor 62 according to said second value U _N of electrical voltage from said value U _E of predefined input electrical voltage. Such a preferential design advantageously allows particularly simple and effective management of the electrical power supply of the electric motor 62, in particular in the case where the control system 8 is designed and configured to automatically control a change of electrical power supply of the electric motor 62 , as considered above.

According to the "manual" variant mentioned above, the manual selector is advantageously connected to the microcontroller 82 to cause the emission of the first control signal S ₁ or the second control signal S ₂ in response to an action exerted by the user against the manual selector. According to the "automatic" variant, the microcontroller 82 can include for example a memory in which a predefined control law is programmed and/or be connected to one or more sensors of one or more operating or state parameters of the hairdressing appliance 1, to automatically emit either the first control signal S ₁ or the second control signal S ₂ , advantageously without any particular intervention from the user.

Preferably, the regulatory member 81 of the electrical supply voltage comprises at least one linear voltage regulator 811, that is to say a voltage regulator comprising an active electronic component working in its linear zone or a component passive electronics (for example a Zener diode), working in its inverse zone. This clearly limits the generation of electromagnetic pollution. This linear voltage regulator 811 advantageously makes it possible to deliver in a particularly reliable manner to the electric motor 62, under the effect of reception of the control signal S ₁ , S ₂ concerned, a supply voltage U whose value U _N , U The corresponding _T is lower than the predefined input electrical voltage value U _E. Even more preferably, the linear voltage regulator 811 is a linear regulator with low voltage drop (“ Low Drop-Oup ” (LDO) in English). The use of such a linear regulator with low voltage drop contributes in particular to simplifying and making more reliable the electrical and electronic design of the hairdressing appliance 1, and in particular of the control system 8. In particular, such a linear regulator with low voltage drop voltage drop advantageously generates less electromagnetic pollution than a continuous / continuous chopper (DC / DC). As a result, it advantageously does not require the use of additional coil(s) and/or capacitor(s) to limit the pollution generated and/or correct the outgoing voltage. Preferably, one of the first and second values U _N , U _T of electrical voltage is chosen equal to the value U _E of predefined input electrical 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 member 81 of the electrical supply voltage can then advantageously comprise a controlled switch 812, for example an NPN transistor switch, to power the electric motor 62 according to the value U _N , U _T of electrical voltage concerned and equal to the value U _E of predefined input electrical voltage, under the effect of reception of the corresponding control signal S ₁ , S ₂ .

For example, the second value U _T of electrical voltage chosen equal to the value U _E of predefined input electrical voltage (for example, U _T = U _E = +5 V continuous), and the first value U _N of electrical voltage chosen lower (strictly) than the second value U _T of electrical voltage (for example, U _N = +3.3 V DC). In this case, the regulatory member 81 of the electrical supply voltage can then advantageously comprise, as illustrated schematically in the :
– a linear voltage regulator 811, and preferably a linear regulator with low voltage drop, to deliver said first value U _N of electrical voltage, under the effect of reception of the first control signal S ₁ 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 U _T of electrical voltage, equal to the value U _E of predefined input electrical voltage, under the effect of reception of the second signal S ₂ command issued by the microcontroller 82.

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

In this way, the hairdressing appliance 1 is therefore preferably designed to subject the hair engaged 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 carried out by the movement of the front face 3A, from which brushing pins 7 preferably project, 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 to steam (and preferably water vapor) the hair engaged by the head 3 and in contact with and/or near the heating element 4, advantageously via the steam ejection orifice(s) 710/steam pins 71 which will be described in the following.

The simultaneous implementation, and advantageously combined, of these three treatments (mechanical, thermal and steam) advantageously makes it possible to beautify, and/or care for, and/or repair the hair, and advantageously also allows for shaping. hair, in particular by disciplining it.

In the case where the hairdressing appliance 1 advantageously comprises 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 be advantageously designed and configured to control in addition (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 be advantageously 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 (that is to say surface temperature). Alternatively, the operation of the heating element 4 could be controlled, for the same purposes, by another system 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 “Positive Temperature Coefficient” (PTC)). Preferably, the second heating device 40 of the heating element 4 is distinct from the first heating device 51 of the vaporization chamber 50.

According to a particular embodiment taking advantage of the above, the control system 8 is more specifically designed and configured to implement:
– a mode (or “mode”) of operational operation E _N , in which the electric motor 62 is powered according to said first electrical voltage value U _N , and
– a transient operating mode (or “regime”) E _T prior to the operational operating mode E _N , in which the electric motor 62 is powered according to said second value U _T of electrical voltage, which is higher (in the sense “strictly higher ") to said first value U _N of electrical voltage.

Advantageously, the operational operating mode E _N of the hairdressing appliance 1 is a normal, "nominal" operating mode, in which the hairdressing appliance 1 can be used normally for styling, brushing, detangling and/or straightening hair. hair using a flow of steam emitted by the hairdressing appliance 1. The operational mode of operation E _N can advantageously correspond to a stationary or quasi-stationary regime (or "cruise" regime) of operation of the hairdressing device 1. In said operational mode of operation E _N , the pump 61 actuated by the electric motor 62 therefore supplies liquid to the vaporization device 5 according to said first mass supply flow rate D _N (“normal mass flow rate” or “operational mass flow”). The control system 8 therefore then advantageously controls the operation of the electric motor 62, by supplying the latter according to said first value U _N of electrical voltage, so that the pump 61 takes liquid from the reservoir 60 and delivers it, according to said first mass feed flow rate D _N , towards the vaporization device 5, and in particular towards the vaporization chamber 50 of the latter.

In the operational mode E _N, the vaporization device 5 is advantageously at a temperature allowing vaporization of the liquid, that is to say at a temperature whose value is at least equal to the vaporization temperature (T _vap ) of the liquid considered. The temperature of the vaporization device 5 in the operational operating mode E _N is preferably substantially constant and whose (predefined) value is preferably between 100 °C and 180 °C, more preferably 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 thanks to the pump 61 is thus vaporized within the vaporization chamber 50 so as to form the vapor flow, or “operational steam flow”, intended to be directed towards and onto the user's hair. As such, 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 at the vaporization temperature of the liquid considered, and for example in the aforementioned ranges of values or temperature values, in said transient operating mode E _T.

Advantageously, the transient operating mode E_Tprior to said operational mode of operation E_NOTcorresponds in return to a temporary, non-operational regime of the hairdressing device 1. The hairdressing device 1 is therefore designed to be in the transient operating mode E_T, during which the device 1 is not normally intended to be used for treating hair, then in the operational mode of operation E_NOT, in which the device 1 is then fully usable for styling hair. In other words, unlike the operational mode of operation E_NOT, the transient operating mode E_Tis limited in time independently of the use of the hairdressing appliance 1. Thus, when starting up the hairdressing appliance 1, which corresponds for example to switching on the power supply of the latter (preferably controlled by a switch), device 1 is first in transient operating mode E_T(which begins at time t₀in the example of figures 6 and 7). Transient operating mode E_Tis then followed by operational operating mode E_NOT(which begins at time t₃in the example of Figures 6 and 7), in which the device 1 advantageously remains until it is for example turned off (end of power supply) by the user.

In the transient operating mode E _T , the pump 61 actuated by the electric motor 62 therefore supplies liquid to the vaporization device 5 according to said second mass supply flow rate D _T , which is then greater (strictly) than said first mass flow rate d supply D _N (that is to say according to a non-zero value of the second mass feed rate D _T which is (strictly) greater than a respective non-zero value of the first mass feed rate D _N ). Thus, while the first electrical voltage value U _N and the first mass flow rate of supply D _N advantageously correspond respectively to a value of "normal" electrical supply voltage and to a mass flow rate of "normal" liquid supply of the vaporization device 5, the second value U _T of electrical voltage and the second mass flow rate of supply D _T advantageously correspond respectively to an electrical voltage value for “supercharging” of the electric motor 62 and to a mass flow rate of “supercharge” of liquid to 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 U _T of electrical voltage, so that the pump 61 takes liquid in the tank 60 and delivers it, according to the second mass feed flow rate D _T , towards the vaporization device 5, and in particular towards the vaporization chamber 50 of the latter.

In the transient operating mode E _T, the vaporization device 5 is advantageously at a temperature allowing vaporization of the liquid, that is to say at a temperature whose value is at least equal to the vaporization temperature (T _vap ) of the liquid considered. The temperature of the vaporization device 5 in the transient operating mode E _T is preferably substantially constant and whose (predefined) value is preferably between 100 °C and 180 °C, more preferably 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 thanks to the pump 61 is thus 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 device 1 at room temperature and at an altitude close to sea level. It is preferable that, constant or not, the temperature of the vaporization device 5 is maintained greater than or equal to 100 °C during the operational operating mode E _N , including in the event of sudden liquid supply. However, it is advantageous for the temperature of the vaporization device 5 not to be too high in order to avoid the appearance of a heating phenomenon, which may prove detrimental to the proper functioning of the vaporization device 5. A temperature with a value of 130°C, or at least advantageously between 105°C and 150°C, thus presents a good compromise. As such, 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 at the vaporization temperature of the liquid considered, and for example in the aforementioned ranges of values or temperature values, in the transient operating mode E _T.

The ability of the hairdressing appliance 1 to implement such a transient operating mode E_T, during which the vaporization device 5 is temporarily supercharged with liquid, therefore under the effect of an electrical “supercharge” of the electric motor 62, makes it possible in particular to quickly and efficiently initiate the generation of steam, so that the device 1 is then in optimal conditions to generate the flow of steam (“operational steam flow”) intended to be directed towards and on the hair of the user, when the device 1 is in operational operating mode E_NOT. In this sense, said transient operating mode E_Tcan thus advantageously correspond to a so-called “forced priming” regime of steam generation by the vaporization device 5. This also makes it possible to replace all or part of the air, present in the different supply piping elements in liquid and/or steam guidance of the device 1, by liquid and/or steam and therefore again accelerate the provision of the hairdressing device 1 to the user. In addition, such a temporary oversupply of liquid to the vaporization device 5 can advantageously result, during the transient operating mode E_T, a particularly imperfect vaporization of the liquid resulting in the formation of vapor more heavily loaded with droplets and/or microdroplets of liquid than is the vapor subsequently generated during the operational mode of operation E_NOT. To the extent that said at least one steam outlet 502 of the vaporization chamber 50 of the vaporization device 5 is advantageously in permanent fluid communication with the surrounding exterior air via said at least one vapor ejection orifice 710 , as envisaged previously, it advantageously follows the ejection from the device 1, during the transient operating mode E_Tof a steam flow (“transient steam flow” or “initial steam flow”) which is more visible to the naked eye by the user than is the steam flow (“operational steam flow” ) which is then ejected during the operational mode of operation E_NOT.Typically, the fluid being water, the transient vapor flow can thus be emitted in the form of a cloud or a whitish fog, while the operational vapor flow, less loaded with droplets and/or microdroplets of Liquid water is emitted in a more transparent form, more difficult to detect with the naked eye. This phenomenon then advantageously contributes to visually informing the user of the fact that the steam generation function of the device 1 is indeed functional.

Still to the extent that said 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 exterior air, it also follows that the transient vapor flow can be advantageously ejected from the device 1 in transient operating mode E _T , preferably via said at least one steam ejection orifice 710, according to a second mass flow rate of steam (“transient mass flow rate of steam” or “initial mass flow rate of steam”) which is greater than a first mass flow rate of steam (or “operational mass flow rate of steam”) according to which the operational steam flow can be advantageously ejected from the apparatus 1 in the mode of operational functioning E _N . In other words, the implementation of the transient operating mode E _T can advantageously result in a burst of a large steam jet (or “ burst ” in English). The emission of such an initial jet of steam also advantageously contributes to informing the user of the fact that the steam generation function of the device 1 is indeed functional. What is more, the emission of such an initial jet of steam can advantageously contribute to freeing, where appropriate, said at least one steam ejection orifice 710 from possible small foreign bodies likely to obstruct or damage it. cover at least partially (dust, hair debris, dander, dry residue of hairspray or styling gel, etc.).

Thus, the device 1 is advantageously, at the end of the transient operating mode E _T , in optimal steam generation operational conditions with a view to optimal use of the device 1 in operational operating mode E _N to style, brush, detangle and/or straighten hair using steam.

Preferably, the control system 8 is configured to automatically control a transition from the transient operating mode E _T to the operational operating mode E _N (“automatic” variant). The transition from transient operating mode E _T to operational operating mode E _N is therefore preferably carried out automatically, without positive intervention from the user. This ensures optimal operation of the hairdressing device 1 without having to request any intervention from the user. The latter can, however, be warned of the achievement of the operational operating mode E _N by any suitable means of signaling, and for example by the cessation of the temporary steam flow emitted in the form of a cloud or a whitish fog. Preferably, the values that the first and second supply flow rates D _N , D _T are then respectively likely to affect are fixed (by the designers of the device 1), that is to say they do not are preferably not modifiable by the user. As such, the hairdressing appliance 1 is therefore advantageously devoid of adjustment means allowing the user to directly set or adjust one and/or the other of the values of the first and second supply flow rates D _N , D _T , that is to say therefore advantageously devoid of adjustment or selection means, allowing the user to pass the electrical supply voltage of the electric motor 62 actuating the pump 61 from one to the other of the first and second values U _N , U _T of electrical voltage.

Advantageously, the control system 8 is configured so that, during the operational operating mode E _N , the average value of the first mass feed rate D _N is at least equal to 0.5 g / min (grams per minute, ie approximately 8.33.10 ^-6 kg / s), preferably between 0.5 g / min and 3 g / min ( ie between approximately 8.33.10 ^-6 kg / s and 5.10 ^-5 kg / s), preferably still between 0.5 g/min and 1.1 g/min ( ie between approximately 8.33.10 ^-6 kg/s and approximately 1.83.10 ^-5 kg/s), and for example substantially equal to 0, 8 g/min ( ie approximately 1.33.10 ^-5 kg/s). Thus, the steam flow (operational steam flow) emitted by the steam emission means of the hairdressing appliance 1 when the latter is in operational operating mode E _N can advantageously present a first mass flow rate of steam ( operational mass flow rate of steam) of an average value symmetrically at least equal to 0.5 g/min ( ie approximately 8.33.10 ^-6 kg/s), preferably between 0.5 g/min and 3 g/min ( ie between approximately 8.33.10 ^-6 kg / s and 5.10 ^-5 kg / s), more preferably between 0.5 g / min and 1.1 g / min ( ie between approximately 8.33.10 ^-6 kg / s and approximately 1.83.10 ^-5 kg / s), and for example substantially equal to 0.8 g / min ( ie approximately 1.33.10 ^-5 kg / s). In accordance with the explanations provided previously, the adjustment of the values of the first and second mass supply flow rates D _N is advantageously carried out by a choice of the corresponding first and second values U _N , U _T of the electrical supply voltage of the electric motor 62. Such average steam mass flow values prove to be well suited for effective styling, brushing, detangling and/or straightening of hair with steam. In addition, such average values of first mass flow rate of supply D _N allow excellent autonomy of the device 1 in liquid, so that it is not necessary to implement a reservoir 60 of high capacity and therefore bulky or to fill the tank 60 during the same session of use of the device 1. The comfort of use is therefore improved.

As illustrated by example in Figures 6 and 7, in the operational operating mode E _N , the average value (non-zero) of the mass feed flow D is advantageously constant and equal to said average value of the first mass feed flow D _N , for the entire duration during which the control system 8 controls the effective implementation of the operational operating mode E _N. Still as illustrated by example in Figures 6 and 7, the control system 8 is advantageously configured to control, in the operational operating mode E _N , a supply of liquid to the vaporization device 5 thanks to the pump 61 in a continuous, uninterrupted manner , over time, for the entire duration of effective implementation of the operational mode of operation E _N . As such, as in the example of Figures 6 and 7, the control system 8 is perhaps designed and configured to constantly maintain, throughout the duration of the operational operating mode E _N , an electrical supply to the electric motor 62 according to a value of the electrical supply voltage U substantially equal to said first electrical voltage value U _N. However, it nevertheless remains possible that the control system 8 is designed and configured to constantly maintain, throughout the duration of the operational operating mode E _N , an electrical supply to the electric motor 62 according to a value of the voltage U electrical supply which differs over time, that is to say for example according to said first value U _N of electrical voltage, then according to another value U _N of electrical voltage (different from said first value U _N of voltage electrical, and preferably also different from said value U _T of electrical voltage).

In order to further optimize the aforementioned effect of "forced initiation" of the generation of steam by the vaporization device 5, as well as advantageously the effect of generating an initial jet of steam in the form of a cloud of steam particularly visually detectable by the user, the average value of the second mass feed flow rate D _T is preferably between 120% and 1000% of the respective average value of the first mass feed flow rate D _N. More preferably, the average value of the second mass feed flow rate D _T is between 150% and 300% and for example equal to 150%, of the respective average value of the first mass feed flow rate D _N. This makes it possible in particular, on the one hand, to limit the risk of ejection by the device 1 of hot drops of liquid, and therefore dangerous for the user, under the effect of too insufficient vaporization of said liquid and, on the other hand 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.

Preferably, the average value of the second mass feed flow rate D _T is between 0.6 g/min and 5 g/min ( ie between 1.10 ^-5 kg/s and approximately 8.33.10 ^-5 kg/s), preferably between 1 g/min and 2.5 g/min ( ie between 1.67.10 ^-5 kg/s and approximately 4.17.10 ^-5 kg/s), and for example substantially equal to 1.2 g/min ( ie 2.10 ^-5 kg/s). This is particularly advantageous when the average value of the first mass feed flow rate D _N 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 in the above.

As illustrated by example in Figures 6 and 7, in the transient operating mode E _T , the non-zero average value of the mass feed flow D is advantageously constant and equal to said average value of the second mass feed flow D _T , for the entire duration during which the control system 8 controls an effective electrical supply to the electric motor 62 during the operational mode of operation E _N. In other words, the control system 8 is advantageously configured to only control, in the transient operating mode E _T , the power supply of the electric motor 62 according to said second value U _T of electrical voltage, so that the pump 61 therefore supplies liquid to the vaporization device 5 only according to said second mass supply flow rate D _T. Still as illustrated by example in Figures 6 and 7, the control system 8 is advantageously configured to control, in the transient operating mode E _T , a supply of liquid to the vaporization device 5 in a continuous, uninterrupted manner, over time. According to this preferred variant, the control system 8 is therefore advantageously configured to, when it controls the effective power supply of the electric motor 62 ( ie U not zero), continuously, uninterruptedly control a power supply of the electric motor 62 according to said second value U _T of electrical voltage (and therefore not sequentially). Thus, the supply of liquid to the vaporization device 5 according to said second mass feed rate D _T is therefore done in one go, all at once, and not in a fractional, sequential manner. The two aforementioned additional preferential characteristics, each taken independently or preferably in combination, contribute in particular to simplifying the implementation of the transient operating mode E _T and to optimizing the aforementioned effect of “forced initiation” of steam generation by the vaporization device 5, as well as advantageously the effect of generating an initial jet of steam in the form of a cloud particularly visually detectable by the user.

It is preferable that the duration of liquid supply to the vaporization device 5 according to the second mass supply flow rate D _T is chosen sufficiently short with regard to the value of the second mass supply flow rate D _T and the volume and/or of the temperature of the vaporization chamber 50 (and therefore of its capacity to vaporize a more or less significant 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 burning drops of liquid during the transient operating mode E _T. As such, it is preferable that the control system 8 is configured so that, in said transient operating mode E _T , the electric motor 62 is powered according to said second value U _T of electrical voltage during a transient supply duration d _T 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 said transient operating mode E _T , the vaporization device 5 is therefore preferably supplied with liquid during a transient supply duration d _T of a value substantially between 1 s and 120 s, preferably substantially 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 carried out continuously over time, according to an average value of the second mass supply flow rate D _T preferably between 0.6 g / min and 5 g / min, preferably still between 1 g/min and 2.5 g/min. Such a configuration is particularly well suited in fact for a vaporization chamber 50 of conventional dimensions equipping a portable steam hairdressing device of the hairdressing brush, straightening brush, detangling brush or straightener type.

Advantageously, the control system 8 is configured to implement, during said transient operating mode E _T :
– a main sub-mode (or “sub-speed”) E _Tp , in which the electric motor 62 is powered according to said second electrical voltage value U _T so that the pump 61 supplies liquid to the vaporization device 5 according to said second mass feed rate D _T , in accordance with what has been described previously, and
– a preheating sub-mode (or “sub-regime”) E _Tc , prior to said main sub-mode E _Tp , 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.

During said preheating sub-mode E _Tc , the vaporization device 5 is therefore advantageously not supplied with liquid, the electric motor 62 actuating the pump 61 not being electrically supplied. The control system 8 is advantageously connected to the first heating device 51 of the vaporization device 5 in order to control a progressive rise in the temperature of the latter, and in particular of the vaporization chamber 50, until reaching a sufficient predefined temperature value (typically greater than or equal to 100 °C in the case of water, and preferably within the ranges - or equal to the aforementioned preferential value) to cause immediate vaporization of the liquid when the latter will then be introduced into the vaporization chamber 50 during the main sub-mode E _Tp . Optionally, the value of the predefined preheating temperature of the vaporization device 5 could be chosen higher than the operating temperature of the vaporization device 5 during the operational operating mode E _N , so as to promote more intense, more brutal vaporization, liquid during the main sub-mode E _Tp 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 E _Tp . Alternatively, and although in a less preferential manner in particular in terms of the ease of design and the reliability of operation of the device 1, it is possible that such a vaporization temperature of the vaporization device 5 is not controlled by the control system 8, but for example by another distinct system, and that the control system 8 is not configured to implement such a preheating sub-mode E _Tc .

The control system 8 is more preferably configured to automatically control a transition from said preheating sub-mode E _Tc to said main sub-mode E _Tp as a function of at least one of the following criteria: once the value of the temperature predefined temperature is reached and/or at the expiration of a predefined preheating time, and more preferably once said value of the predefined temperature is reached. The transition from the preheating sub-mode E _Tc to the main sub-mode E _Tp is therefore preferably carried out automatically, without positive intervention from the user. This guarantees that the functional device 1 is made available without the user having to take care of it. The device 1 can thus comprise, for example, a temperature probe which is arranged in contact with the vaporization chamber 50 of the vaporization device 5, and which is connected to the control system 8 in order to transmit to the latter information as to at the temperature of the vaporization chamber 50, and to maintain a power supply to the first heating device 51 as long as the predefined temperature value is not reached. Alternatively or additionally, the control system 8 may comprise, for example, an internal clock to control maintaining an electrical supply of the first heating device 51 at least until the expiration of said predefined preheating time. The value of the predefined preheating time may possibly depend on certain technical characteristics of the device 1 (electrical power, dimensioning of the vaporization device 5, for example), and is obviously chosen sufficient to authorize the achievement of the value of the preset temperature. Typically, the value of the preheating time, predefined or not, is advantageously between 10 s and 60 s, and for example 45 s, without this range and this value being of course limiting.

Optionally, the control system 8 can be advantageously configured:
– to implement, during said transient operating mode E _T and at the end of said main sub-mode E _Tp , a time delay sub-mode (or “sub-speed”) E _Tt during which the electrical power supply to the motor electrical 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 E _Tt (and therefore from the transient operating mode E _T ) to the operational operating mode E _N, and therefore automatically control the electrical supply of the electric motor 62 according to said first value U _N of electrical voltage, so as to control the supply of liquid to the vaporization device 5 according to said first mass flow rate D _N.

In other words, the transient operating mode E_Tthen advantageously ends, in this case, by the implementation of a particular sub-mode of operation during which the electric motor 62 is not electrically powered (U = 0 V) and the vaporization device 5 does not is therefore not supplied with liquid (D = 0 g/min). The implementation of such a timer sub-mode E_Ttmay prove interesting, depending in particular on the choice of the average value of the second mass feed flow rate D_Tand the sizing of the vaporization device 5, in order to allow the latter to finish vaporizing the liquid and/or evacuating the vapor at the end of the main sub-mode E_T if necessary, and thus avoid saturation of the vaporization chamber 50 which could degrade its performance, or even the emission of a jet of burning drops of liquid when operating mode E is engaged._NOT.Additionally, since “boosting” (second U value_Tof electrical voltage, second mass flow D_Tsupply) can lead to a drop in the temperature of the vaporization device 5, the implementation of such a time delay sub-mode E_Ttcan advantageously allow the time necessary for the vaporization device 5 to be gradually reduced to said predefined temperature value (or to another predefined target temperature value, in the event that the temperature value predefined temperature of the vaporization device 5 during operational operating mode E_NOTdiffers from the predefined temperature value to be reached during preheating sub-mode E_Tc).

According to a principle similar to that described above with regard to the preheating sub-mode E _Tc , the control system 8 can thus be advantageously configured to automatically control the transition from the transient operating mode E _T to the operational operating mode E _N depending on at least one of the following criteria: once a predefined target value of the temperature of the vaporization device 5 is reached (use of a temperature probe, for example) and/or upon expiration a predefined pause time (use of an internal clock, for example).

Advantageously, said first value U _N of electrical voltage, according to which the electric motor 62 is powered in the operational operating mode E _N , is substantially equal to the value U _name of nominal operating electrical voltage of the electric motor 62 (U _N = U _noun ). This presents several notable interests here. On the one hand, such a choice is favorable for the lifespan of the electric motor 62, and therefore for the reliability of the steam emission means of the hairdressing appliance 1, insofar as the operational mode of operation E _N corresponds to an operating mode of the hairdressing appliance 1 in which the electric motor 62 is required to operate for the longest time. On the other hand, in the particular case where the control system 8 is configured to implement the aforementioned timing sub-mode E _Tt in which the electrical power supply to the electric motor 62 is interrupted, the fact that the first value U _N of electrical voltage is chosen substantially equal to said value U _name of nominal electrical voltage makes it possible to ensure that the electric motor 62 restarts every time instantly when it is supplied according to the first value U _N of electrical voltage. This could not always be the case in the hypothesis where the first value U _N of electrical voltage would be chosen substantially equal to said value U _name of nominal electrical voltage, so that the reliability of the steam generation function of the hairdressing device 1 could be damaged.

As a result of the above, said second value U _T of electrical voltage, according to which the electric motor 62 is powered in the transient operating mode E _T , is therefore advantageously (strictly) greater than the value U _name of nominal electrical voltage of operation of the electric motor 62. This poses no particular problem in terms of starting the electric motor 62. Furthermore, taking into account the fact that the transient operating mode E _T is a temporary operating mode, which advantageously is not intended to be implemented over a long period of time in comparison with the respective duration of implementation of the operational mode of operation E _N , the electrical supply of the electric motor 62 according to a value U _T of voltage greater than its value U _name of voltage nominal electric power has only a minimal, if not negligible, impact on the lifespan of the electric motor 62.

For example, it is advantageously possible to implement, as in the example of Figures 6 and 7 which will be described below, a continuous electric motor 62 with permanent magnet brushes having a nominal electrical operating _voltage U of a value of +3.3 V continuous, controlled alternately by the control system 8 according to a first value U _N of electrical supply voltage of +3.3 V continuous ( ie U _N = U _nom ) and according to a second value U _T supply electrical voltage of +5.0 V continuous.

Figures 6 and 7 schematically illustrate in the form of graphics the same example of configuration of the control system 8 of a hairdressing appliance 1 according to the invention. In this example, the control system 8 is configured so that once the device 1 is started (t ₀ ), the latter is automatically found successively:
– from t ₀ : in the preheating sub-mode E _Tc, 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 (t ₁ = t ₀ + 45 s). The electric motor 62 is not powered (U = 0 V continuous, ), and the liquid supply flow rate of the vaporization device 5 is zero (D = 0 g / min, ) ;
– from t ₁ : in the main sub-mode E _Tp , during which the electric motor 62 is powered according to a second value U _T of electrical voltage of +5.0 V DC ( ), so that the vaporization device 5 is supplied with liquid by the pump 61 continuously, according to a constant average value of second mass supply flow rate D _T of 1.2 g / min, for a supply duration transient d _T of 15 s (t ₂ = t ₁ + 15 s = t ₀ + 60 s, excluding possible edge effects in terms of mass flow visible at the ) ;
– from t ₂ : in the timing sub-mode E _Tt , in which the electrical supply to the electric motor 62, and therefore the liquid supply to the vaporization device 5, are interrupted (U = 0 V continuous, ; D = 0 g/min, ) for 5 s (t ₃ = t ₂ + 5 s = t ₀ + 65 s);
– then from t ₃ : in the operational operating mode E _N , in which said electric motor 62 is supplied uninterruptedly according to a first value U _N of electrical voltage of +3.3 V continuous, corresponding here to the value U _name of nominal electrical operating voltage of said electric motor 62 ( ). The vaporization device 5 is thus supplied with liquid continuously according to a constant average value of first mass flow rate of supply D _N of 0.8 g / min ( ). Throughout the duration of said operational operating mode E _N , the vaporization device 5 is maintained at a predefined vaporization temperature of the liquid, for example equal to 130 ° C.

The aforementioned electrical voltages can advantageously be measured using a voltmeter, such as commonly available commercially, or any other suitable device making it possible to measure an electrical voltage (or “electrical potential difference”) between two points. Mass flow rates D_NOT,D_T, aforementioned can be advantageously determined by calculating the difference in mass of the tank 60 for a predetermined duration in transient operating mode E_T, and respectively in operational operating mode E_NOT. In other words, weighing and time measurement are advantageously used to determine mass flow rates. The mass and the mass difference of the tank 60 can be determined easily and precisely with common weighing instruments, and by carrying out several measurements, the results of which are for example averaged. In practice, the tank 60 filled with liquid (typically water) is weighed. The balance is then tared before removing the reservoir 60 from the balance plate. Then, after the test (device 1 operating in transient operating mode E_T, respectively in operational operating mode E_NOTfor a predetermined period), the tank 60 - which now contains less water - is weighed again on the already tared scale. This therefore makes it possible to measure the difference in weight/mass before and after the test as a negative value. Of course, in this case we will use a balance adapted to differential weighing, allowing a negative differential value to be measured, which is the case with most laboratory balances available. The use of differential weighing as described above, if it proves to be particularly simple and practical, is of course not the only possibility for determining the mass flow and we can use methods implementing other types sensor. Finally, it should be noted that for a liquid such as water, whose density is known and constant, a measurement of the mass reflects a measurement of the volume. Therefore, a measurement of the mass of liquid water moved by a pump in a given time (mass per unit time) is also equivalent to a measurement of the flow rate (volume per unit time) of the pump. In the case where the transient operating mode E_Tincludes one and/or the other preheating sub-mode E_Tcand timer submode E_Ttdescribed previously, we will advantageously endeavor to exclude from the measurements the periods of time corresponding to the implementation of these specific sub-modes, so as to retain only a measurement relating to the main sub-mode E_Tp.

Preferably, in the operational operating mode E _N , said heating element 4 intended to come into contact with the hair has a first surface temperature (that is to say a surface temperature) whose value is at least equal to 110 °C. More preferably, in the operational operating mode E _N , said value of the first surface temperature of the heating element 4 is at least equal to 120°C, and is advantageously between 120°C and 200°C. Even more preferably, in the operational operating mode E _N , the value of said first surface temperature is between 130°C and 170°C, preferably between 140°C and 160°C, for example substantially equal to 150°C. °C. Particularly preferably, quite remarkable results in particular in terms of beautification of the hair, and more particularly in terms of reduction of defects and improvement of shine, can be obtained when, in the operational mode of operation E _N , 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 steam whose average value is equal to 0.8 g / min ± 0.3 g / min ( ie approximately 1.33.10 ^-1 kg / s ± 5.10 ^-5 kg / s), and therefore advantageously in association with a first mass feed flow rate D _N whose average value is symmetrically equal to 0.8 g/min ± 0.3 g/min ( ie approximately 1.33.10 ^-1 kg/s ± 5.10 ^-5 kg/s).

Advantageously, the control system 8 can also be configured to control, during the entire duration of the transient operating mode E _T or only during the preheating sub-mode E _Tc provided above, a progressive increase in the first surface temperature of the heating element 4, so that, when the device is then in the operational operating mode E _N , the value of the first surface temperature of said heating element 4 is at least equal to 110 ° C, and preferably within the aforementioned preferential value ranges.

Preferably, the brushing pins 7 which project from the front face 3A of the head 3 include at least:
– heating pins 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 pins 70, and is preferably formed by the heating pins 70, and
– steam pins 71 each integrating 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 in the above.

Said steam pins 71 thus contribute preferentially to forming said steam emission means. To this end and as explained previously, each steam ejection orifice 710 is advantageously in fluid communication with the interior of the vaporization chamber 50 via the channeling device 52. The steam pins 71 thus assume, in in addition to their mechanical brushing function, a steam sprayer function, that is to say that each steam pin 71, with its steam ejection orifice 710, advantageously forms a steam projection nozzle (preferably of water vapor). Thus, thanks in particular to the steam pins 71, the mechanical treatment of the hair, under the effect of a resistive force generated by the hair against the steam pins 71, is advantageously combined with a fluidic treatment of the hair (supply of steam via the steam ejection port 710 of the steam pins 71). The term “ combined ” is understood here in the sense of simultaneous performance of said mechanical and fluidic treatments on the same area of hair. Thus the same portion of strand of hair will undergo simultaneously, that is to say concomitantly, both a fluid treatment and a mechanical treatment. This allows you to obtain a “double” action combined and concentrated on the same area of hair. This makes it possible to increase the effectiveness of the treatment, and to obtain excellent results in terms of hair styling, beautification and hair care, while minimizing the number of necessary passes of the hair styling device 1 against the hair.

In a particularly advantageous manner, the surface temperature of the heating pins 70 corresponds to the first aforementioned surface temperature of the heating element 4, the value of which in operational operating mode E _N is advantageously at least equal to 110 ° C, while the steam flow (operational steam flow), whose first mass flow rate of steam value is advantageously at least equal to 0.5 g/min, escapes through the orifices 710 of the steam pins 71. This embodiment is particularly advantageous because it allows a thermomechanical steam treatment to be applied to the hair in an optimal and particularly effective manner. The use of pins 70, 71 to heat and diffuse the steam, in addition to the brushing function that they naturally provide, makes it possible to best diffuse the steam within the strands of hair while ensuring optimal heat exchange. .

Preferably, the steam pins 71 also play the role of heating pins, in addition to their steam diffusion function. In other words, the steam pins 71 then advantageously contribute to forming both the heating element 4 and the steam emission means. Thus, thanks to said steam pins 71, the mechanical treatment of the hair (under the effect of a resistive force generated by the hair against the steam pins 71) is, even more advantageously, combined not only with a fluidic treatment of the hair (supply of steam via the steam ejection orifice 710 of the steam pins 71 contributing to forming the means of steam emission as mentioned previously, but also with heat treatment of the hair (supply of heat by the pins to steam 71 contributing to forming the heating element 4). Thus the same portion of strand of hair will undergo simultaneously, that is to say concomitantly, both a mechanical treatment, a fluid treatment, and a heat treatment This makes it possible to obtain a “triple” action combined and concentrated on the same area of hair. This makes it possible to further increase the effectiveness of the treatment of the hair by the hairdressing device 1, and thus to obtain results even better in terms of hairdressing, beautification and hair care, while still minimizing the number of necessary passes of the hairdressing device 1 against the hair.

The invention also relates, as such, to a method of producing steam by a steam hairdressing appliance 1 comprising a liquid vaporization device 5 to generate, from a liquid (typically water) , a flow of steam advantageously intended to be directed towards and on the hair of a user, a pump 61 for supplying liquid to said vaporization device 5 and an electric motor 62 to actuate said pump 61. Typically, the pump 61 and the electric motor 62 are included in a power supply device 6, which includes the hairdressing appliance 1 concerned, to supply liquid to the vaporization device 5. Advantageously, the hairdressing appliance 1 concerned by the method of the invention is a hairdressing appliance 1 according to the invention as described in detail in the above. In other words, the method according to the invention is advantageously implemented using a hairdressing device 1 according to the invention. Consequently, the description of the hairdressing device 1 (in particular in terms of design, operation, effects and associated technical advantages) above applies mutadis mutandis to said process.

In accordance with the invention, said method comprises:
– a first operating step of the hairdressing appliance 1, during which said electric motor 62 is powered according to a first value U _N (non-zero) of electrical voltage so that the pump 61 supplies liquid to the vaporization device 5 according to a first mass feed rate D _N (non-zero), and
– a second operating step of the hairdressing appliance 1, during which said electric motor 62 is powered according to a second value U _T (non-zero) of electrical voltage different from said first value U _N of electrical voltage so that the pump 61 supplies liquid to the vaporization device 5 according to a second mass supply flow rate D _T (non-zero) which is different from said first mass supply flow rate D _N.

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

According to a particular, non-limiting embodiment,
– said first operating step is an operational operating step of the hairdressing appliance 1, during which the pump 61 therefore supplies liquid to the vaporization device 5 according to said first mass supply flow rate D _N (“normal mass flow rate” or “operational mass flow”), 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 U _T , which is greater (in the sense “strictly greater”) than said first value U _N of electrical voltage. During said transient operating step, the pump 61 therefore supplies liquid to the vaporization device 5 according to said second mass feed rate D _T which is then greater than said first mass feed rate D _N.

Said operational operating step and said transient operating step respectively advantageously correspond to the operational operating mode E _N and the transient operating mode E _T such as the latter have been described previously.

During the operational stage_,the vaporization device 5 is advantageously at a temperature allowing vaporization of the liquid, that is to say at a temperature whose value is at least equal to the vaporization temperature (T_vape) of the liquid considered. The temperature of the vaporization device 5 during the operational operating step is preferably substantially constant and whose (predefined) value is preferably between 100 ° C and 180 ° C, more preferably between 105 ° C and 150 ° C. C and for example substantially equal to 130°C. Respectively, during the transient operating stage, the vaporization device 5 is advantageously at a temperature allowing the vaporization of the liquid, which is preferably substantially constant and whose (predefined) value is preferably between 100 ° C and 180 ° C, more preferably between 105 ° C and 150°C and for example substantially equal to 130°C.

Advantageously, the transition from the transient operating stage to the operational operating stage is carried out automatically.

Preferably, and for the effects and advantages (ejection of a large jet of steam or " burst " in English) already described previously in connection with the hairdressing device 1 according to the invention,
– the hairdressing appliance 1 emits an operational flow of steam according to a first mass flow rate of steam (“operational mass flow rate of steam”) during the operational operating stage, advantageously therefore under the effect of the electrical power supply of the motor electrical 62 according to said first electrical voltage value U _N (and therefore under the effect of the liquid supply to the vaporization device 5 according to said first mass supply flow rate D _N ),
– the hairdressing appliance 1 previously emitting a transient steam flow (“initial steam flow”) according to a second mass flow rate of steam (“transient mass flow rate”) during the transient operating step, advantageously therefore under the effect respectively of the electrical supply of the electric motor 62 according to said second electrical voltage value U _T (and therefore under the effect of the liquid supply to the vaporization device 5 according to the second mass supply flow rate D _T ) , said second mass flow rate of steam being greater than the first mass flow rate of steam.

Preferably, said first value U _N of electrical voltage is chosen so that the average value of the first mass flow rate of steam is at least equal to 0.5 g/min ( ie approximately 8.33.10 ^-6 kg/s), of preferably between 0.5 g/min and 3 g/min ( ie between approximately 8.33.10 ^-6 kg/s and 5.10 ^-5 kg/s), more preferably between 0.5 g/min and 1.1 g/min ( ie between approximately 8.33.10 ^-6 kg/s and approximately 1.83.10 ^-5 kg/s), and for example equal to 0.8 g/min ( ie approximately 1.33.10 ^-5 kg/s) . Preferably, the average value of the second mass flow rate of steam is between 120% and 1000%, and more preferably between 150% and 300%, of the respective average value of the first mass flow rate of steam. Preferably, the second value U _T of electrical voltage is chosen so that the average value of the second mass flow rate of steam is between 0.6 g / min and 5 g / min i.e. between 1.10 ^-5 kg / s and approximately 8 .33.10 ^-5 kg / s), preferably between 1 g / min and 2.5 g / min ( ie between 1.67.10 ^-5 kg / s and approximately 4.17.10 ^-5 kg / s), and for example substantially equal to 1.2 g/min ( ie 2.10 ^-5 kg/s).

Particularly advantageously, the vapor of the transient vapor flow is more heavily loaded with droplets and/or microdroplets of liquid than is the vapor of the operational vapor flow.

Preferably, said transient operating step comprises:
– a main sub-step, in which the electric motor 62 is powered according to said second electrical voltage value U _T so that the pump 61 supplies liquid to the vaporization device 5 according to said second mass supply flow rate D _T , and
– a preheating sub-step, prior to said main sub-step, 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 , preferably still between 105°C and 150°C, and for example substantially equal to 130°C.

Advantageously, the main sub-step and the preheating sub-step correspond respectively to the main sub-mode E _Tp and to the pre-heating sub-mode E _Tc such as the latter have been 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, depending on at least one of the following criteria: once the predefined temperature value is reached and/or at the expiration of a predefined preheating time, and preferably again once said predefined temperature value is reached.

Optionally, the transient operating step of the hairdressing appliance 1 can advantageously comprise, at the end of the main sub-step, a timing sub-step in which the electrical power supply to the electric motor 62 is interrupted, so that the liquid supply to the vaporization device 5 is interrupted, the passage from the timing sub-step to the operational operating step being advantageously carried out automatically. Advantageously, said timing sub-step corresponds to the timing sub-mode E _Tt as the latter was described previously. Advantageously, the transition from the timing sub-step to the operational operating step is carried out automatically according to at least one of the following criteria: once a predefined target value of the temperature of the vaporization device 5 is reached and/or at the end of a predefined pause time.

It will be noted for all practical purposes that the terms "first" / "first" and "second" used in the present description preferably have no ordinal or cardinal connotation, that is to say that they do not imply here no notion of order, quantity or any categorization of elements, components, sizes, stages, etc. to which these terms are attached. In this case, their sole purpose is to facilitate the understanding of the invention by making it possible to differentiate between them certain technical characteristics of the invention.

Claims (16)

Steam hairdressing appliance (1) comprising a liquid vaporization device (5) for generating, from a liquid, a flow of vapor, a pump (61) for supplying liquid to said vaporization device (5), an electric motor (62) for operating said pump (61), and a control system (8) designed and configured to control the power supply of the electric motor (62) and alternately power the latter at least

• according to a first value (U _N ) of electrical voltage so that the pump (61) supplies liquid to the vaporization device (5) according to a first mass supply flow rate (D _N ), and
• according to a second value (U _T ) of electrical voltage different from said first value (U _N ) of electrical voltage so that the pump (61) supplies liquid to the vaporization device (5) at a second mass supply flow rate ( D _T ) which is different from said first feed mass flow rate (D _N ).

Hairdressing appliance (1) according to the preceding claim, in which the control system (8) comprises a regulating member (81) of the electrical supply voltage of the electric motor (62) from a value (U_E) of predefined input electrical voltage, and a microcontroller (82) to alternately transmit the electrical supply voltage to the regulating member (81)

• a first control signal (S ₁ ) for controlling the power supply of the electric motor (62) according to the first value (U _N ) of electrical voltage, and
• a second control signal (S2) for controlling the power supply of the electric motor (62) according to the second value (U _T ) of electrical voltage.

Hairdressing apparatus (1) according to the preceding claim, in which 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 dropout. tension. Hairdressing apparatus (1) according to any one of the preceding claims, wherein said pump (61) is a peristaltic pump. Hairdressing apparatus (1) according to any one of the preceding claims, in which the average value of the first mass feed rate (D _N ) 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 apparatus (1) according to any one of the preceding claims, in which the average value of the second mass feed rate (D _T ) 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, in which the control system (8) is designed and configured to implement:

• an operational operating mode (E _N ), in which the electric motor (62) is powered according to said first value (U _N ) of electrical voltage, and
• a transient operating mode (E _T ) prior to said operational operating mode (E _N ), in which the electric motor (62) is powered according to said second value (U _T ) of electrical voltage, which is greater than said first value ( U _N ) of electrical voltage.

Hairdressing apparatus (1) according to the preceding claim, in which the first value (U _N ) of electrical voltage is equal to a value (U _nom ) of nominal electrical operating voltage of the electric motor (62). Hairdressing apparatus (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 (E _T ), the electric motor is powered according to said second value (U _T ) of electrical voltage during a transient supply duration (d _T ) of a value between 1 s and 120 s, preferably between 10 s and 30 s, and for example equal to 15 s. Hairdressing apparatus (1) according to any one of claims 7 to 9, in which the control system (8) is configured to automatically control a transition from the transient operating mode (E _T ) to the operational operating mode (E _N ). 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 (E _Tp ), in which said electric motor (62) is powered according to said second value (U _T ) of electrical voltage so that the pump (61) supplies liquid to the vaporization device (5) according to said second mass feed rate (D _T ), and
• a preheating sub-mode (E _Tc ), prior to said main sub-mode (E _Tp ), 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 included 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 transition from the preheating sub-mode (E _Tc ) to the main sub-mode (E _Tp ) depending on of at least one of the following criteria: once the predefined temperature value is reached and/or at the expiration of a predefined preheating time, and preferably once said predefined temperature value is achievement. Hairdressing apparatus (1) according to claim 10 and any one of claims 11 and 12, in which the control system is configured:

• to implement, during the transient operating mode (E _T ) and at the end of the main sub-mode (E _Tp ), a timing sub-mode (E _Tt ) during which the electrical supply of the electric motor (62 ) is interrupted,
• then to automatically control the transition from timer sub-mode (E _Tt ) to operational operating mode (E _N ).

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 said liquid with liquid vaporization device (5), an electric motor (62) for operating said pump (61), said method comprising:

• a first operating step of the hairdressing appliance (1), during which said electric motor (62) is powered according to a first value (U _N ) of electrical voltage so that the pump supplies liquid to the vaporization device (5 ) according to a first mass feed rate (D _N ), and
• a second operating step of the hairdressing appliance (1), during which said electric motor (62) is powered according to a second value (U _T ) of electrical voltage different from said first value (U _N ) of electrical voltage so as to that the pump (62) supplies liquid to the vaporization device (5) at a second mass feed flow rate (D _T ) which is different from said first mass feed flow rate (D _N ).

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 voltage value (U _T ). electrical, which is greater than said first value (U _N ) of electrical voltage.

Method according to the preceding claim, in which the hairstyling appliance (1) emits an operational flow of steam according to a first mass flow rate of steam during the operational operating step, said hairstyling appliance (1) previously emitting a flow of steam transient according to a second mass flow rate of steam during the transient operating step, the second mass flow rate of steam being greater than the first mass flow rate of steam.