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
• • 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

Definitions

• a hairdryer including:
• the object of the present invention is to solve the technical problems described previously.
• the object of the present invention is to provide a hairdryer that will be intrinsically safe for the user even following upon conditions that might cause an accident of an electrical nature due to accidental contact with water.
• the object of the present invention is achieved by a hairdryer having all the features listed at the outset of the present description, and moreover characterized in that:
• said at least one electrical resistance is coated with electrically insulating material
• said motor unit includes a watertight casing housing said electric motor.
• FIG. 1 is a perspective partial see-through view of a hairdryer according to various preferred embodiments of the invention
• FIG. 2 is a longitudinal cross-sectional view according to the trace II-II of Figure 1;
• FIG. 3 is a perspective view of internal components of the hairdryer of Figures 1 and 2;
• FIG. 4 is a perspective view of a casing of a motor unit of the hairdryer according to the invention.
• FIG. 5 and 6 are perspective views according to the arrows V and VI of Figure 4, respectively.
• the reference number 1 in Figure 1 designates as a whole a hairdryer according to various embodiments of the invention.
• the hairdryer 1 includes a casing 2, which develops along a longitudinal axis XI and provided within which is a flow duct 4.
• the flow duct 4 is in fluid communication with the external environment by means of an intake port 4IN and a delivery port 40UT. Within the flow duct 4 there are arranged, all coaxial to the axis XI, a rotor 6 and a motor unit 8 including an electric motor M configured for driving the rotor 6 in rotation about the axis XI.
• the rotor 6 can be driven in rotation for sucking in an air flow through the port 4IN and sending it through the flow duct 4 towards the port 40UT.
• the hairdryer 1 includes a first electrical resistance 10 and a second electrical resistance 12, both obtained by means of a nickel-chromium steel wire wound in a cylindrical and/or conical helical path.
• Each of the resistances 10, 12 is coated with an electrically insulating material resistant to high temperatures, for example Teflon.
• the resistances 10, 12 are coated throughout their development.
• Each of the resistances 10, 12 is supported radially by means of a plurality of ribs 14 of thermoinsulating material, for example mica.
• Each of the ribs 14 includes a substantially T-shaped coupling profile T14. With reference to Figure 2, the ribs 14 are fixed to the motor unit 8 by means of the profiles 14T.
• the motor unit 8 includes a watertight casing 16, with the electric motor M enclosed within the watertight casing 16 itself.
• the casing 16 includes a first shell 18 having a substantially hollow ogival shape, a seal 19 (for example, an annular seal of an CD- ring type), and a second shell 20.
• the seal 19 is set between the shells 19 and 20 to guarantee water tightness at the interface between them.
• the motor M is fixed by means of screws to the shell 18.
• Each of the shells 18, 20 is provided with a plurality of radial eyelets spaced at equal angular spaces apart, which are designated, respectively, by the reference numbers 18A, 20A.
• These radial eyelets are used for fixing of the ribs 14, and in particular for coupling with the profiles T14, which are configured for engaging in the eyelets 18A, 20A and for being withheld radially by them thanks to the undercut offered by the T-shape.
• the coupling between the shells 18, 20 is obtained axially along the axis XI with interposition of the seal 19 and with the motor M already inside the casing 16, then the shells 18, 20 are fastened together by means of screws S that engage, in corresponding sequences, two axial holes (one smooth and one threaded), one for each of the shells 18, 20.
• the shell 20 is provided with an array of radial vanes 21, which are configured for co- operating with the rotor 6 for regularizing the air flow within the flow duct 4.
• the radial vanes are configured for acting as cooling fins for dissipating the heat generated by the electric motor M.
• the shell 20 is substantially cup-shaped and includes a first radial extension 22 configured for fixing it to the casing 2, and a second radial extension 24 having within it a channel 26 configured for routing one or more electrical wiring systems that carry the supply to the motor M.
• the radial extension 24 moreover passes through the casing 2 and is connected thereto through a seal 28, which eliminates the possibility of penetration of water into the interface between the casing 2 and the extension 24.
• a handle (not visible) by means of which the user can grip the hairdryer during use and inside which the electrical wiring coming out of the channel 26 is routed.
• a set of pushbuttons may be provided by co-injection of silicone in order to maintain water tightness.
• the shell 20 moreover includes a through hole coaxial to the axis XI, which is traversed by an output shaft 30 of the motor M, fitted on which is the rotor 6.
• the shell 20 is closed at the end by a watertight cap 31 that fits on the shaft 30 so as to guarantee water tightness also at the (sliding) interface with the shaft 30.
• the cap 31 incorporates a watertight bearing (preferably, a ball bearing) configured for receiving the output shaft 30 and for ensuring water tightness between the latter and the second shell 20.
• the shell 16 also includes a through hole coaxial to the axis XI fitted in which is a plug-like seal 32, which couples in a watertight way with the hole in the casing 16.
• the plug-like seal 32 includes one or more pairs of through orifices configured for being traversed by the wires that constitute the electrical resistances 10, 12 in such a way that the latter can penetrate within the casing 16 and be incorporated with the wiring that is routed in the channel 26 without jeopardizing water tightness of the casing 16 itself.
• the resistances 10, 12 are obtained by means of a single wire wound twice, a first time to form the resistance 10 and a second time to form the resistance 12, so that only two portions of wire traverse the seal 32.
• the resistances 10, 12 may be provided by means of separate wires - for example, to envisage a differentiated supply thereof in order to vary the heat power, and consequently the temperature of the air - so that there will be two pairs of portions of wire that traverse the seal 32.
• a sleeve 34 having a shape that preferably reproduces, albeit on a smaller scale, the shape of the walls of the casing 2.
• the sleeve 34 is located in particular in a position comprised between the electrical resistances 10, 12 and the wall of the casing 2, with respect to which it is supported by means of a plurality of radial ribs 36, preferably obtained in an integral way with the casing 36.
• the flow duct 4 is split (albeit not necessarily throughout the length of the casing 2: this depends upon the axial extension of the sleeve 34 with respect to the casing 2) into a main duct defined substantially inside the sleeve 34, within which find the electrical resistances 10, 12 and at least part of the watertight casing 16 of the motor unit 8 are located, and a secondary flow duct, which has an annular cross section and is set around the sleeve 34, in particular between the latter and the casing 2.
• a second amount of air flow - the smaller amount - passes into the secondary duct, eliminating the moisture that might be present within the casing 2 and cooling the casing 2 as a whole, thus enabling installation of electrical resistances of higher power in the case where the application were so to require.
• This moreover enables thermal insulation of the area occupied by the resistances through a curtain of cool air generated by the intake within the secondary duct.
• This solution keeps the whole casing 2 cooled and at the same time improves the air flow, in a way at least roughly resembling the effect exerted by the so-called Vortex winglets typical of a wing profile.

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• Cleaning And Drying Hair (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54105910

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (17)

• 2016
  • 2016-06-23 US US15/739,386 patent/US20190090607A1/en not_active Abandoned
  • 2016-06-23 WO PCT/IB2016/053734 patent/WO2016207821A1/en active Application Filing
  • 2016-06-23 CN CN201680049228.7A patent/CN107920647A/zh active Pending
  • 2016-06-23 RU RU2018102353A patent/RU2018102353A/ru not_active Application Discontinuation
  • 2016-06-23 EP EP16745828.0A patent/EP3313228A1/de not_active Withdrawn

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