Classifications

• • A—HUMAN NECESSITIES
  • A45—HAND OR TRAVELLING ARTICLES
  • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
  • A45D20/00—Hair drying devices; Accessories therefor
  • A45D20/04—Hot-air producers
  • A45D20/08—Hot-air producers heated electrically
  • A45D20/10—Hand-held drying devices, e.g. air douches
  • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands

Definitions

• the present invention relates to a hairdryer allowing the adaptation of the airflow by automatically compensating the pressure drop due to a decrease in the output section driven by an accessory mounted on the outlet mouth of the dryer -hair.
• Hairdryers are often equipped with means for controlling and adjusting parameters of the air blown by the device, such as speed, flow rate or temperature.
• the air flow and / or the temperature are generally selected by the user.
• hair dryers comprising adjustment means for the automatic modification of parameters, without the intervention of the user.
• US 5,790,749 discloses a hair dryer comprising a mechanism measuring the radiation emitted by the hair.
• This hair dryer also includes a control mechanism that acts together on airflow and temperature to regulate the flow of hot air during drying based on the measurements of radiation emitted by the hair.
• WO 2012/076885 illustrates a hairdryer which comprises a fan and control means automatically controlling the operation of the fan so as to maintain, at least substantially, a constant volume of air flow during the use.
• CN103349418 discloses a hair dryer capable of automatically adjusting the air flow.
• the hair dryer includes modules to capture moisture, store and compare data, control and change the speed of the airflow.
• US 2006/0098962 discloses a hair dryer comprising a microprocessor controlled by software to receive a set of information measured by sensors, such as temperature, pressure, engine rotation speed, power consumption by the motor and the heating resistor, ...
• the microprocessor is programmed to continuously check the data, but also to adjust this data with respect to control variables.
• the present invention aims to overcome the disadvantages of the state of the art, and in particular to provide a hair dryer adapting the airflow depending on the accessory mounted on its outlet mouth.
• hair dryers can be provided with various accessories, such as nozzles, diffusers, brushes or combs for performing the shaping of the hairstyle. These accessories usually hinder the air outlet and change the effective section of the outlet of the hair dryer.
• the present invention provides a simple solution for adapting the air flow according to the accessory mounted on the apparatus.
• the present invention discloses a hair dryer comprising:
• a housing with an air inlet and an air outlet
• said microprocessor adapts the speed of the fan according to the accessory placed on the air outlet of the housing.
• the invention comprises one or more of the following features:
• - Adaptation of the fan speed is based on the measurement of the intensity of the current consumed by the engine
• the intensity of the current varies according to the section of the accessory placed on the outlet air outlet; -
• the fan speed is increased due to a drop in intensity and decreased due to an increase in the current of the motor;
• the temperature of the airflow leaving the hair dryer is substantially constant, said hair dryer being devoid of manual regulation of temperature;
• the housing comprises a removable silencer
• the increase of the fan speed is adapted between a high limit and a low limit, preferably in a range of 2000 to 6000 rpm, particularly preferably over a range of 3000 to 5000 rpm;
• the hair dryer comprises an ion generator;
• the fan comprises a hybrid blade configuration, with a radial component and an axial component;
• the air flow drop is at least compensated by up to 20%, preferably 35%, particularly preferably at 50%.
• Figure 1 shows an example of a hair dryer according to the invention with an air outlet section of 1000 mm 2 .
• Figure 2 shows a sectional view of the hair dryer according to the invention.
• Figure 3 shows a view of the hair dryer according to the invention provided with an accessory having a minimum air outlet section of 290 mm 2 .
• Figure 4 shows another accessory having a minimum air outlet section of 558 mm 2 .
• Figure 5 shows a flowchart showing the steps of adaptation of the operation of the hair dryer of the invention.
• Figure 6 shows the speed of the motor, the current consumption by the motor and the air flow depending on the section of the air outlet mouth of a hair dryer of the state of the art. 'art.
• Figure 7 shows the speed of the motor, the current consumption by the motor and the air flow as a function of the section of the air outlet of the hair dryer of the invention.
• Figure 8 shows the variation of current intensity of the motor of the hair dryer of the invention as a function of time.
• FIG. 1 An example of a hair dryer 1 according to the invention is illustrated in FIG.
• This includes a housing 2 provided with a handle 3. Like all hair dryers, it can be provided with a hairdressing accessory, mounted on the air outlet mouth 5.
• accessory means an element removably attached to the air outlet of the hair dryer, for shaping the hairstyle, such as nozzles, diffusers, brushes or combs. These accessories modify the effective section of the outlet, which increases the resistance to the flow of air and therefore also changes the airflow of the hair dryer.
• nozzles diffusers
• brushes or combs These accessories modify the effective section of the outlet, which increases the resistance to the flow of air and therefore also changes the airflow of the hair dryer.
• the housing of the hair dryer contains a fan 6 provided to suck the air inside the housing and circulate it between the air inlet mouth 4 and the air outlet mouth 5. Before its exit, the sucked air is heated by heating elements 9, such as a heating resistor, through its passage therethrough.
• the fan 6 is actuated by a motor 7.
• the motor 7 is a brushless type motor, managed by a microprocessor 8 to adapt the speed of the fan 6 when the current consumption of the motor 7 is changed.
• the hair dryer of the invention comprises a microprocessor 8 controlling the brushless motor 7 to adapt the speed of the fan 6 when the consumption (intensity) of motor current 7 is changed.
• the microprocessor thus allows an adaptation of the air flow as a function of the accessory mounted on the outlet air outlet.
• the microprocessor adapts the speed, in order to increase the speed of rotation of the fan to compensate for the decrease in the outgoing air flow.
• the increase in the speed of the fan is of course adapted between certain limits, and in particular between a high limit and a low limit, preferably in a range from 2000 to 6000 revolutions per minute, particularly preferably on a range from 3000 to 5000 rpm.
• the engine speed is 21,000 rpm when no accessory is provided, and is increased to 24,000 rpm when the accessory is mounted on the dryer. hair.
• the first step is to measure the current intensity of the motor 7. As soon as the speed of the motor is stabilized, the current intensity is measured continuously by the microprocessor to detect a fall or increase in this intensity. From the moment an accessory is added to the hair dryer, the intensity of the current consumed by the motor decreases. When this intensity falls below a certain critical threshold (called “Low Threshold” - Figure 8), the microprocessor detects that an accessory is placed on the hair dryer. The engine therefore responds accordingly and increases its speed in order to compensate for the loss of flow due to the use of the accessory and therefore to the effective section reduction of the air outlet mouth 5. Once the high speed is reached , the current intensity is measured again permanently.
• a certain critical threshold called “Low Threshold” - Figure 8
• the intensity - unlike previously - increases slightly.
• the microprocessor considers that the accessory is removed from the hair dryer.
• the engine therefore responds accordingly and slows down to return to its original speed without an accessory.
• the intensity is again measured in order to detect the addition of an accessory.
• the air flow rate is limited to a maximum of 45%, preferably 40%, particularly preferably 35%.
• the hair dryer illustrated in Figure 3 is provided with a nozzle 1 1 having a minimum air outlet section of 290 mm 2 , while the same hair dryer, without accessories, has a mouth of exit d 1000mm 2 section air.
• minimum section of air outlet is meant the section calculated at the narrowest passage of the nozzle, this section being a section parallel to the outlet mouth 5 of the fan. In this case, this means that the section of the air outlet is reduced by 71% when the accessory is mounted on the unit.
• a hair dryer of the prior art which does not involve servocontrolling the flow of air at the section of the outlet mouth, will have at least a flow reduction of about 71%, without taking into account the additional decrease due to the loss of load.
• the minimum air outlet section of the nozzle 1 1 is 558 mm 2 , which means that the section reduction is 44%.
• a hair dryer of the prior art will have at least a flow reduction of about 44%, without taking into account the additional decrease due to the pressure drop.
• the fall of air flow of a hair dryer according to the invention is compensated at least to 20%, preferably 30%, particularly preferably 50%. In the example shown in the graph of Figure 7, the airflow drop is compensated at 31%.
• the fan 6 has a hybrid configuration, with both a radial component and an axial component (mixed flow type fan).
• the housing of the hairdryer includes a removable muffler.
• the silencer generally comprises one or more noise attenuation elements (open-cell foam, etc.).
• the hair dryer according to the invention also comprises an ion generator, for generating an ion flow at the air outlet of the hair dryer.
• the user can choose whether or not to activate this ion generator with a control button on the handle of the device.
• the handle may include a plurality of activation switches.
• the first switch actuates the motor of the hair dryer while the second activates the ion generator.
• a switch can also be provided for the heating element, which allows the use of the hair dryer without heat, in "cold" mode.
• the hair dryer does not need a temperature selector, since the temperature of the outflow is substantially constant when the heating elements 9 are activated. By substantially, it is meant that the temperature does not vary more than plus or minus 10 ° C, preferably 5 ° C. Indeed, since the airflow is adapted through the microprocessor, the heating elements do not need to have different heating powers. A single heating power is sufficient to ensure a substantially constant temperature, and the hair dryer is therefore devoid of manual temperature control.
• Indicators of activation / deactivation of the hair dryer, heating elements and the ion generator may be provided on the handle of the device.

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Citations (6)

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• 2018
  • 2018-03-30 EP EP18713286.5A patent/EP3614876B2/fr active Active
  • 2018-03-30 ES ES18713286T patent/ES2863461T3/es active Active
  • 2018-03-30 CN CN201880021721.7A patent/CN110520009B/zh active Active
  • 2018-03-30 WO PCT/EP2018/058328 patent/WO2018197158A1/fr unknown

Patent Citations (6)

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