EP0393018A1 - Appareil électrique comportant un élement de chauffage - Google Patents

Appareil électrique comportant un élement de chauffage Download PDF

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Publication number
EP0393018A1
EP0393018A1 EP19900890110 EP90890110A EP0393018A1 EP 0393018 A1 EP0393018 A1 EP 0393018A1 EP 19900890110 EP19900890110 EP 19900890110 EP 90890110 A EP90890110 A EP 90890110A EP 0393018 A1 EP0393018 A1 EP 0393018A1
Authority
EP
European Patent Office
Prior art keywords
ptc heating
heat
heating element
grooves
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19900890110
Other languages
German (de)
English (en)
Inventor
Walther Dr. Menhardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DR. PETER NESVADBA GESELLSCHAFT M.B.H.
Original Assignee
Ptc Ceramics Heiz- und Regeltechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ptc Ceramics Heiz- und Regeltechnik GmbH filed Critical Ptc Ceramics Heiz- und Regeltechnik GmbH
Publication of EP0393018A1 publication Critical patent/EP0393018A1/fr
Withdrawn legal-status Critical Current

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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
    • A45D20/48—Hair-drying combs or hair-drying brushes, with internal heating means
    • A45D20/50—Hair-drying combs or hair-drying brushes, with internal heating means and provision for an air stream
    • 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
    • A45D1/00—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor
    • A45D1/02—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with means for internal heating, e.g. by liquid fuel
    • A45D1/04—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with means for internal heating, e.g. by liquid fuel by electricity
    • 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 invention relates to an electrically heated working device, in particular a hair drying and hairdressing device, which has a radiator in which a PTC heating element or a plurality of such heating elements is or are arranged as a heat source, and further a built-in, motor-driven blower with which a Air flow can be promoted via the radiator to the outlet openings provided on the device for the heated air, and has a rod-shaped heatable working part.
  • a hair drying and hairdressing device which has a radiator in which a PTC heating element or a plurality of such heating elements is or are arranged as a heat source, and further a built-in, motor-driven blower with which a Air flow can be promoted via the radiator to the outlet openings provided on the device for the heated air, and has a rod-shaped heatable working part.
  • a known device of the aforementioned type is designed as a hair drying and undulating device, an approximately finger-strong tube with numerous air outlet openings being provided for the undulating device, which carries a funnel-like extension and can be plugged with this extension onto a hot air outlet connection of the device which is dimensioned for hair drying.
  • this known device emits a warm air flow generated by the fan of this device, the characteristics of the PTC heating element of this device and the reduction in air throughput, which goes along with the plugging in of the pipe intended for undulating, Desirably, a warm air at a higher temperature is emitted from the device for the undulating than when the undulating tube is removed through the connection piece intended for drying the hair.
  • the characteristics of the PTC heating element also prevent undesired overheating.
  • the working device designed according to the invention is characterized in that the radiator is a rod-like body provided with longitudinal air channels, which is arranged at least with part of its length in the rod-shaped working part and has one or more metallic heat-conducting bodies which are in close heat-conducting contact with the or the PTC heating element (s), whereby the heat conducting body has a rod shape or the heat conducting bodies are assembled together to form a rod - shaped body and the heat conducting body (s) are provided with longitudinal passages and / or longitudinal grooves on the outside or / . are.
  • the design and arrangement of the radiator makes it possible to remove a relatively large amount of heat from the radiator via the air conveyed by the blower and thereby achieve an air temperature such as that e.g. for drying hair and e.g. is also desired for working with warm air hairdressing brushes, and the device can also be used with the fan switched off for hairdressing work in which heat is probably to be used but no airflow is desired, with the characteristics of the PTC heating element or such heating elements causing disadvantageous overheating is switched off.
  • the inventive design of an electrically heated implement can be provided for implements for different areas of application. So you can provide the inventive design in addition to hair dryers and hairdressers for plastic contact welding devices, in which a heated working part is provided, which is used to melt the surface of plastic parts to be connected, the heated air flow for preheating the working area and if desired also for supplementary Heat supply during melting and possibly also to slow down the cooling process can be used.
  • the design according to the invention can also be provided and used in a soldering device, the working part forming the body (“piston”) that liquefies the solder, for example a tin solder.
  • the working part of a device designed according to the invention can be designed as a warm holder for solid, pasty or liquid substances which are to be applied to heated surfaces or are to be applied to surfaces under the influence of hot air, for example hot melt adhesive, the heating of the surfaces using the hot air stream can be made.
  • a device can also be designed to keep warm or preheat and apply medication.
  • a preferred embodiment of the working device according to the invention is characterized in that the power supply lines to the PTC heating element (s) are connected to surfaces of the PTC heating element (s) which, in addition to the surfaces of the or of the heat conducting body Heating elements (s) are located, the power supply lines being connected in particular to the narrow surfaces of the PTC heating element (s) running in the longitudinal direction of the heat-conducting body.
  • This embodiment makes it possible to emit a considerably larger amount of heat when operating with the fan running than when operating with the fan stopped.
  • the heat-conducting body is a metal profile which has at least one groove or a passage channel into which one or more PTC heating element (s) is inserted or ., and further has a plurality of grooves and / or through-channels for forming air channels. It is for achieving good heat transfer from the PTC heating elements to the heat-conducting bodies, both with regard to keeping the heat-transfer resistance small and with regard to the application and absorption of the pressing force which the PTC heating element or these heating elements presses against the heat-conducting body or bodies.
  • the side surfaces of the groove (s) provided for inserting one or more PTC heating elements or the side surfaces of the through-channel or through-channels which receive the PTC heating elements are wedge-shaped to one another, wherein the geometrical generatrices of these side surfaces run in the longitudinal direction of the groove (s) or the through-channel or the through-channels, that the PTC heating element (s) is / are also wedge-shaped, and the wedge surfaces of the PTC or Heating elements (s) approximately parallel to the mentioned side surfaces of the groove (s) or Durc
  • the passage channel or the passage channels run that an insulation is inserted between the PTC heating element (s) and said side surfaces and that the PTC heating element (s) is or are kept pressed against said side walls.
  • the heat-conducting body is a metal profile with a star-shaped cross-section, which has radially outwardly extending walls, between which longitudinal grooves are formed on the circumference of the profile , wherein, distributed over the circumference of the profile, two or three PTC heating element-receiving grooves are provided and between these grooves there are further grooves which form air channels.
  • a technically and thermally favorable mounting or fixation of the PTC heating element or several such heating elements in a heat-conducting body designed as mentioned above can be achieved if, according to an advantageous embodiment of the device according to the invention, one or more PTC heating elements ( e) containing (n) groove (s) on the circumference of a retaining web is inserted, which in turn is held on undercuts and / or flanges provided in the groove side surfaces. It is furthermore favorable if an elastic packing, for example between the retaining web and the PTC heating element underneath, made of mineral wool, which presses the PTC heating element against the groove walls.
  • a mineral formed from Al2O3 can advantageously be used as mineral wool, which has both favorable elastic properties and good thermal conductivity and good electrical insulation.
  • Another cheap embodiment of the working device according to the invention in particular hair drying and hairdressing device, which has the advantage that manufacturing tolerances can be easily compensated for when assembling the PTC heating element or several such heating elements with the heat-conducting body, characterized in that two are used as heat-conducting bodies Grooved rails or molded pipes with at least one flat wall arranged parallel to one another are provided, the PTC heating element (s) being inserted between flat, mutually facing base surfaces of these grooved rails or the mutually facing flat sides of the shaped pipes.
  • a relevant embodiment of the device according to the invention is thereby characterized in that openings are provided when the air ducts are formed in the form of through ducts in the heat-conducting body or in heat-conducting bodies in the outer wall of these through ducts, distributed over their longitudinal extent.
  • a variant corresponding to this embodiment is characterized in that when the air ducts are formed in the form of grooves provided on the outside of the heat-conducting body (s), these grooves are provided with a number of covers which, seen in the longitudinal direction of the grooves, also have Alternate free zones in which the grooves are open to the outside. This results in a structurally simple design if one provides that the covers are each designed in the form of sleeves running around the heat conducting body or bodies.
  • the working device 1 shown in FIGS. 1 and 2 which is designed as a hair drying and hairdressing device, has a rod-shaped working part 2 which adjoins a handle part 3 located next to it.
  • the device 1 has a heater 6, which is rod-shaped and with which an air stream supplied by a fan 5 can be heated;
  • outlet openings 4 are provided, through which the air heated on the radiator 6 can escape in order to effect the drying or shaping of hair.
  • the heat source of the radiator 6 is formed by a PTC heating element 7 or by several such heating elements.
  • the heater 6 is a rod-like body, in which longitudinal air channels are provided, in which the air supplied by the fan 5 is heated.
  • the heater 6 has a metallic heat-conducting body 8 which bears on the PTC heating element or elements 7 and which is provided on the outside with longitudinal grooves 9 which form the air channels in which the heating of the air takes place.
  • These grooves are provided with a number of covers, which can be designed in the form of sleeves 11, which run around the heat-conducting body 8. Seen in the longitudinal direction of the grooves, the covers or sleeves 11 alternate with exposed zones 10, in which the grooves 9 are open to the outside.
  • the outflow of the air heated in the radiator 6 can be adjusted in such a way that the desired distribution of the outflowing air quantity and the desired temperature distribution, as seen over the longitudinal extent of the working part 2, result.
  • the PTC heating elements 7 are also wedge-shaped and are held pressed against the side surfaces 15 of the grooves 14, the wedge surfaces 16 of the PTC heating elements 7 running approximately parallel to the side surfaces 15 of the grooves 14.
  • Electrical insulation 18 is inserted between the PTC heating elements 7 and the side surfaces 15 of the grooves 14, which in the present case is formed by an insulating film which is wrapped around the PTC heating elements 7 in a plurality of circumferential windings or layers. Instead of such a wound insulation, it is also possible to provide insulation made of foil platelets or of platelets made of a heat-conducting, electrically insulating ceramic material.
  • the insulation can advantageously be supplemented by an electrically insulating and good heat-conducting paste, which reduces the heat transfer resistance at the abutting or abutting points.
  • a retaining web 20 is inserted circumferentially, which in turn Undercuts 21 which are provided in the groove side surfaces 15 and are held by flanges 22 of the groove side walls.
  • Elastic packings 23, which press the PTC heating elements against the groove walls, are inserted between the holding webs 20 and the PTC heating elements 7 underneath.
  • Such elastic packs can consist of mineral wool, for example, wool made of Al2O3 being particularly suitable. Other elastic bodies or packs, such as film wraps, are also suitable.
  • the power supply lines 24 to the PTC heating elements 7 are connected to the narrow surfaces 26 of the PTC heating elements 7 running in the longitudinal direction of the grooves 15; this results in a relatively favorable current distribution in the PTC heating elements, which results in a relatively uniform thermal load on these heating elements and thus also ensures that these heating elements have a good regulating effect.
  • the air flow passing through the grooves 9 can dissipate a relatively large amount of heat from the heat-conducting body 8, as a result of which its temperature drops and at the same time the temperature of the PTC heating elements is reduced, so that there is a reduction in the electrical resistance in these heating elements and thus leads to a higher current flow and a higher heat generation.
  • the wall 27 of the working part 2 of the device is essentially smooth and has no projections or the like.
  • FIG. 3 shows, to provide tufts of bristles 28 or flexible comb teeth or the like projecting outwards from the wall 27 in the wall 27 of the working part 2 next to the outlet openings 4 for the heated air, like this B. is shown in the left half of Fig. 3; the result is a warm air brush that can be used both to dry the hair and to fix hairstyles.
  • the heat-conducting body is formed by a metal profile 32 which has a through-channel 33 into which a PTC heating element 7 is inserted, and further through-channels 34 are provided in the metal profile 32 on both sides of the through-channel 33 that serve to form air channels.
  • the side surfaces 15 of the through-channel 33 run in a wedge shape to one another, and the PTC heating element 7 is also wedge-shaped and is held pressed against the side surfaces 15 of the through-channel 33; the wedge surfaces 16 of the PTC heating element 7 run approximately parallel to the side surfaces 15 of the through-channel 33.
  • Insulations 18 are inserted between the wedge surfaces 16 of the PTC heating element 7 and the side surfaces 15 of the through-channel 33, for example in the form of pieces of film or in the form of Ceramic plates can be formed. Furthermore, an insulating compound 37 is provided in the passage 33, in particular in the area adjoining the wider side of the PTC heating element, which has good thermal conductivity has and further has a thermal expansion coefficient which is matched to the thermal expansion coefficients of the other components of the radiator, in particular to the thermal expansion coefficient of the metal profile 32, so that when the heating occurs during operation of the radiator, the wedge surfaces 16 are pressed firmly on the side surfaces 15 of the through channel 33 remains guaranteed.
  • the heat-conducting insulating compound 37 also fills any small gaps between the wedge surfaces 16 of the PTC heating element 7 and the insulation 18, and between the insulation 18 and the side surfaces 15 of the through-channel 33, so that only very little thermal resistance occurs at these transition surfaces.
  • the power supply lines 24 are connected to the narrow surfaces 29 of the PTC heating element 7, which are adjacent to the wedge surfaces 16. Openings 36 are provided in the outer wall 35 of the through-channels 34, so that the air heated in the radiator can emerge from the radiator over the longitudinal extent of the radiator.
  • a heat-conducting body 8 in the form of a metal profile is provided, and this metal profile is star-shaped and has radially outwardly directed outer ribs 40, between which there are longitudinal grooves 9, which form air channels.
  • the longitudinal grooves 9 of the heat-conducting body 8 are covered by the wall 27 of the working part 2 towards the outside, and the air flows out of the air channels formed by the longitudinal grooves 9 through outlet openings 4 located in the wall 27.
  • the heat-conducting body 8 can be provided with covers 11, which have the shape of sleeves, or with webs inserted into the grooves.
  • the PTC heating element 7 is arranged in a through channel 33 of the metal profile forming the heat conducting body 8.
  • the through-channel 33 has wedge-shaped side surfaces 15, and the PTC heating element 7 is also wedge-shaped, the wedge Surfaces 16 of this heating element run approximately parallel to the side surfaces 15 of the through-channel 33.
  • the PTC heating element 7 is electrically isolated by insulating plates 41, which consist for example of a ceramic material such as Al2O3, and by insulating foils 42 from the side surfaces 15 and is pressed against the side surfaces 15 by a screw 39.
  • the insulating plates and insulating foils 41, 42 have a low thermal resistance.
  • a pressure-exerting mass or a pressure-exerting cushion or a pressure spring can also be provided for pressing the PTC heating element 7 onto the side surfaces 15.
  • two shaped tubes 43 arranged parallel to one another are provided as heat conducting bodies, and PTC heating elements 7 are inserted in a clamping manner between the mutually facing flat sides 45 of the shaped tubes 43.
  • the flat sides 45 are the outer sides of flat walls 44 of the shaped tubes 43.
  • the shaped tubes 43 are held together by screws 47 or with suitable clamping springs or retaining rings. If the molded tubes 43 are electrically insulated from one another in a suitable manner, these molded tubes can also be used for supplying the electrical current to the PTC heating elements. If desired, rings or the like can also be provided for the clamping holding together of the two shaped tubes 43, which are electrically insulated from the shaped tubes 43, for example by means of insulating sleeves.
  • a passage channel 46 is provided in each of the two shaped tubes 43 to form an air channel. Openings 36 lead from the through-channel 46 through the molded tube wall to the outside, so that the air heated in the radiator can flow out of these air channels at a number of points distributed over the longitudinal extension of the molded tubes 43.
  • the shaped tubes in the embodiment shown in FIGS. 7 and 8 have an approximately rectangular cross section, but one can also shape Provide pipes with other cross sections, e.g. with a circular segment cross section.
  • grooved rails can be provided, such grooved rails being able to be provided with covers in order to cover or close the air channels formed in the interior of such grooved rails, at least in sections, to the outside.
  • the heating element of the device is formed with heat conducting elements 8a, 8b, which are axially lined up, which are held together by a ring 49 and thus form a rod-like body with one another.
  • the ring 49 can be made of metal and, if necessary, be electrically insulated from the heat-conducting bodies 8a, 8b with an insulation 50.
  • Such an axial stringing together of a plurality of heat-conducting bodies 8a, 8b can bring advantages in terms of assembly technology if the heater of the device is equipped with a plurality of PTC heating elements which are arranged in succession in the axial direction; you can e.g. Arrange a PTC heating element in each heat-conducting body and then assemble the structural units thus formed, as shown in FIG. 9.
  • the embodiment shown in FIG. 10 further develops the embodiment according to FIG. 9 in such a way that the structural units which are lined up and are held together with a ring 49, as in the embodiment according to FIGS. 7 and 8, have heat-conducting bodies of multiple parts, the individual parts 53 , 54 run parallel next to each other and enclose the PTC heating elements 7 by clamping.
  • the parts 53, 54 can e.g. be designed as grooved rails or shaped pipes. It is possible to electrically isolate these parts 53, 54 from one another and to use them to supply current to the PTC heating elements. However, it is also possible to supply the PTC heating elements with their own cables and to electrically separate them from the heat conducting bodies with insulating bodies or insulating foils.
  • the ring 49 can consist of metal and, if necessary, is electrically insulated from the heat-conducting bodies with insulation 50.

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EP19900890110 1989-04-11 1990-04-10 Appareil électrique comportant un élement de chauffage Withdrawn EP0393018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT84889 1989-04-11
AT848/89 1989-04-11

Publications (1)

Publication Number Publication Date
EP0393018A1 true EP0393018A1 (fr) 1990-10-17

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EP19900890110 Withdrawn EP0393018A1 (fr) 1989-04-11 1990-04-10 Appareil électrique comportant un élement de chauffage

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EP (1) EP0393018A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002065870A1 (fr) * 2001-02-19 2002-08-29 Siumui Iris Mok Brosse chauffante electrique
EP1799015A1 (fr) * 2005-12-14 2007-06-20 DBK David + Baader GmbH Unité de chauffage pour appareil de soin de corps et procédé de sa fabrication
DE102012205668A1 (de) * 2012-04-05 2013-10-10 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung zum Erwärmen eines Gases
CN114207361A (zh) * 2019-08-08 2022-03-18 生态科技陶瓷公司 热产生总成和用于控制该总成的方法
GB2602162A (en) * 2020-12-21 2022-06-22 Jemella Ltd Apparatus and method for drying and styling hair

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520999A1 (de) * 1985-06-12 1986-12-18 Reinhard 6361 Niddatal Napierski Foen
EP0260371A2 (fr) * 1986-09-16 1988-03-23 Dov Z. Glucksman Sèche-cheveux électrique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520999A1 (de) * 1985-06-12 1986-12-18 Reinhard 6361 Niddatal Napierski Foen
EP0260371A2 (fr) * 1986-09-16 1988-03-23 Dov Z. Glucksman Sèche-cheveux électrique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002065870A1 (fr) * 2001-02-19 2002-08-29 Siumui Iris Mok Brosse chauffante electrique
EP1799015A1 (fr) * 2005-12-14 2007-06-20 DBK David + Baader GmbH Unité de chauffage pour appareil de soin de corps et procédé de sa fabrication
DE102012205668A1 (de) * 2012-04-05 2013-10-10 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung zum Erwärmen eines Gases
DE102012205668B4 (de) * 2012-04-05 2014-01-16 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung zum Erwärmen eines Gases
EP2647308A3 (fr) * 2012-04-05 2017-12-06 BSH Hausgeräte GmbH Dispositif destiné à chauffer un gaz
CN114207361A (zh) * 2019-08-08 2022-03-18 生态科技陶瓷公司 热产生总成和用于控制该总成的方法
GB2602162A (en) * 2020-12-21 2022-06-22 Jemella Ltd Apparatus and method for drying and styling hair
WO2022136866A3 (fr) * 2020-12-21 2022-09-22 Jemella Limited Appareil et procédé pour sécher et coiffer les cheveux

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