EP0203437B1 - Fan-assisted air heater - Google Patents

Fan-assisted air heater Download PDF

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Publication number
EP0203437B1
EP0203437B1 EP86106373A EP86106373A EP0203437B1 EP 0203437 B1 EP0203437 B1 EP 0203437B1 EP 86106373 A EP86106373 A EP 86106373A EP 86106373 A EP86106373 A EP 86106373A EP 0203437 B1 EP0203437 B1 EP 0203437B1
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EP
European Patent Office
Prior art keywords
hot air
heating element
air
air blower
blower
Prior art date
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Expired - Lifetime
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EP86106373A
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German (de)
French (fr)
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EP0203437A3 (en
EP0203437A2 (en
Inventor
Hans Karey
Anette Berg
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Braun GmbH
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Braun GmbH
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Priority to AT86106373T priority Critical patent/ATE50483T1/en
Publication of EP0203437A2 publication Critical patent/EP0203437A2/en
Publication of EP0203437A3 publication Critical patent/EP0203437A3/en
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Publication of EP0203437B1 publication Critical patent/EP0203437B1/en
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    • 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

  • the invention relates to a hot air blower of the type specified in the preamble of claim 1.
  • a hot air blower having the features specified in the characterizing part of patent claim 1.
  • the inventive selection of the heat storage principle known per se for heating the blower air and the division of the air flow into several - preferably 5 to 10 - air ducts passing through the heat storage heating element create a warm air blower that can be used to construct and produce a new type of handy hair care device makes, remarkably within the scope of the dimensions common today in such devices.
  • the air channels of the heating element have a clear width of 5 to 10 mm, so that the favorable values to be demanded for portable hair care devices - in particular for hand-held hair dryers - are achieved both in terms of the flow rate and the heat transfer and thus the heating power and the time profile thereof will.
  • the heat balance of the heating element can be optimized according to the invention in that the air channels are so distributed over its cross-section that each air channel is assigned geometrically approximately the same amount of heat-storing material, that is to say that each air stream is heated with approximately the same amount of stored heat.
  • This dimensioning which generally presupposes the same cross-sectional areas of the air channels, can be modified in another embodiment in such a way that the parts of the storage mass assigned to the individual air channels are proportional to different cross-sectional areas of these air channels.
  • the heating element which consists, for example, of a ceramic based on A1 2 0 3 and MgO, is subdivided into a number corresponding to the number of air channels, each containing segments of approximately the same mass, the air channel Butt joints between these segments are preferably filled with a leveling compound.
  • This balancing mass can on the one hand prevent an undefined thermal contact between the segments due to unevenness in their abutting surfaces; secondly, by selecting a more or less thermally conductive filler, the heat balance of the entire heating element can be influenced in a targeted manner.
  • the flow pattern can be influenced by providing various helical channels as an alternative or in addition to the usually straight-line air channels, and the air channels can have a cross-section that changes from the air inlet side to the air outlet side, in particular narrowing.
  • the electrical heating conductors provided for heating the heating element can run within the storage material, but are preferably arranged along the walls of the air ducts, where they - e.g. B. in the form of wire heating coils - embedded in the walls of the air ducts in the manufacture of the heating elements.
  • the walls of the air channels can be used to reduce the air flow resistance with a smooth one, in particular made of a lacquer or one Glaze existing surface layer.
  • its heat storage heating element is surrounded by a heat-insulating jacket, and on the outside thereof - but within the device housing - there is at least one intake duct, which in particular has an annular cross section comprising the heating element and through which the Blower drawn cold air is directed against the flow direction generated in the air channels of the storage element to the air inlet side of the blower.
  • This arrangement has the effect that heating of the outer surface of the heat-insulating jacket, which despite its heat-insulating property cannot be completely avoided during the heating-up phase, is used to preheat the sucked-in air when the fan is started up.
  • a plug unit directly into the blower housing, with which it can be connected to a corresponding socket of a power supply unit. It is expedient to provide two pairs of plug contacts, one of which is used to heat the heating element by means of mains voltage and the second is used to charge the electrical accumulators by means of a suitable DC voltage generated in the mains unit. It can be ensured by constructive design of the plug unit on one side and the socket on the other that these two parts can only be inserted into one another in the correct position, so that incorrect polarity can be avoided.
  • the plug unit mentioned is expediently arranged on the end face of the grip end.
  • the hand hair dryer according to the invention contains a heat storage heating element 1, which is enclosed by a heat-insulating jacket 4 and through which a plurality of air channels 2 is penetrated in the direction of its longitudinal axis A.
  • the fan consisting of a low-voltage DC motor 5, a fan wheel 6 and a guide wheel 7 presses the air sucked in through the intake grille 8.1 through the air channels 2.
  • the device housing 9 has a so-called pistol grip 9.1, in which the electric accumulators 14 serving to supply the blower motor and a switch 15, with which the various operating states of the device can be set via its handle 15.1, are accommodated.
  • the handle 9.1 On its end face, the handle 9.1 has two connector pairs 10 and 11, of which only one connector is visible and via which the hand-hair dryer by inserting its handle 9.1 into a corresponding recess of the charger 16 with corresponding socket pairs 12 and 13 of the charger in electrical contact can be brought.
  • the entire internal wiring of the device has been omitted, and the electrical resistance heating elements of the heat accumulator 2 have also been omitted.
  • the cold air intake grille 8.1 is moved into the area of the outlet opening 17 of the device, so that the air reaches the blower unit 5, 6, 7 through the intake duct 8 surrounding the heating element.
  • FIG. 3 shows a cross section through a preferred embodiment of the heat storage heating element which has already been explained above.
  • the heating element here consists of nine segments 1.1 each containing an air duct 2, the butt joints of which are filled with a leveling compound 1.2.
  • the electrical resistors for heating the heat storage segments 1.1 have the form of coatings 3 which are preferably produced by vapor deposition.
  • the wall surfaces 2.1 of the air ducts 2 have a smooth coating, which consists in particular of a lacquer or a glaze .

Landscapes

  • Cleaning And Drying Hair (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Cookers (AREA)
  • Telephone Function (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Resistance Heating (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Devices For Medical Bathing And Washing (AREA)

Abstract

A cordless portable hand held hair dressing appliance has a housing provided with a pistol-grip handle and containing a battery operated electric fan arranged to draw air into the housing through an air inlet for flow through a heat structure to be heated prior to discharge from a housing air outlet. The heater structure includes air elongated heat accumulator member of high specific heat penetrated in the longitudinal direction by a plurality of air ducts each having an intake communicating with the housing inlet and an outlet communicating with a mixing chamber connected to the housing outlet. The heat accumulator member is formed of a ceramic, e.g., Al2O3 and MgO, and is adapted to be heated to store heat therein by an electrical heating conductor structure formed by a layer of electrical resistance material on the wall of each duct. The fan battery is rechargeable and the handle is provided with a detachable electric plug contacts for connecting the heating conductor structure to an external power source for preheating prior to use and for connecting the rechargeable battery to a batter charger.

Description

Die Erfindung betrifft ein Warmluftgebläse der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung.The invention relates to a hot air blower of the type specified in the preamble of claim 1.

Neben den üblichen - am Stromnetz betriebenen, beispielsweise in elektrischen Handhaartrocknern eingesetzten Warmluftgebläsen, sind bereits derartige autark - d.h. netzunabhängig - verwendbare Warmluftgebläse bekannt, die als Wärmequelle einen aus einem Flüssiggas-Tank gespeisten Gasbrenner enthalten. So ist in der DE-OS 31 03 843 ein Handhaartrockner beschrieben, in dem das Gas mit offener Flamme verbrennt, und aus der internationalen Patentanmeldung WO 83/00 607 ist ein entsprechendes Gerät mit flammenloser katalytischer Verbrennung bekannt. Außerdem ist in der DE-OS 14 57 415 vorgeschlagen worden, die Warmluft für eine Haartrockenhaube in einem separaten kofferartigen Behälter mit Hilfe eines elektrisch aufgeheizten Wärmespeichers zu erzeugen.In addition to the usual hot air blowers operated on the power supply, for example used in electric hand hair dryers, such are already self-sufficient - i.e. independent of the mains - usable hot air blowers are known which contain a gas burner fed from a liquid gas tank as the heat source. DE-OS 31 03 843 describes a hand hair dryer in which the gas burns with an open flame, and a corresponding device with flameless catalytic combustion is known from international patent application WO 83/00 607. In addition, it has been proposed in DE-OS 14 57 415 to generate the warm air for a hair dryer hood in a separate suitcase-like container with the aid of an electrically heated heat store.

Alle diese bekannten Geräte bieten zwar den Vorteil, daß sie ohne ein die Bewegungsfreiheit des Benutzers einschränkendes Netzkabel betrieben werden können und daß sie auch dort benutzbar sind, wo eine Steckdose fehlt oder aufgrund bestehender Vorschriften nicht installiert werden darf, jedoch setzen die mit Gas beheizten Geräte die ständige Verfügbarkeit von nachfüllbarem Flüssiggas voraus, und die Beschreibung des vorstehend erwähnten Wärmespeicher-Gebläses enthält keinerlei technische Lehre darüber, wie dessen Wärmehaushalt so verbessert werden kann, daß es der bei einem tragbaren oder sogar ständig in der Hand gehaltenen Haarpflegegerät unabdingbar bestehenden Forderung nach kleinen Abmessungen und geringem Gewicht gerecht wird.All these known devices offer the advantage that they can be operated without a power cord restricting the freedom of movement of the user and that they can also be used where a socket is missing or may not be installed due to existing regulations, but the gas-heated devices set the constant availability of refillable liquefied gas ahead, and the description of the heat storage blower mentioned above contains no technical teaching on how its heat balance can be improved in such a way that it meets the indispensable requirement for small size in a portable or even handheld hair care device Dimensions and light weight meet.

Es stellte sich daher die Aufgabe, ein autark verwendbares Warmluftgebläse aufzuzeigen, das - ohne auf einen Flüssiggas-Vorrat angewiesen zu sein - bezüglich seiner Abmessungen, seines Gewichts sowie seiner Heiz- und Förderleistung die Voraussetzungen für den Einsatz in Handhaartrocknern und anderen tragbaren Haarpflegegeräten erfüllt.It was therefore the task of demonstrating a self-sufficient hot air blower that - without being dependent on a liquid gas supply - meets the requirements for use in hand-held hair dryers and other portable hair care devices in terms of its dimensions, weight and heating and conveying capacity.

Diese Aufgabe wird gemäß der vorliegenden Erfindung durch ein Warmluftgebläse gelöst, das die im kennzeichnenden Teil des Patentanspruches 1 angegebenen Merkmale aufweist. Durch die erfindungsgemäße Auswahl des an sich bekannten Wärmespeicher-Prinzips zur Erhitzung der Gebläseluft und die Aufteilung des Luftstromes auf mehrere - vorzugsweise 5 bis 10 - das Wärmespeicher-Heizelement durchsetzende Luftkanäle wird ein Warmluftgebläse geschaffen, das einen neuen Typ von handlichen Haarpflegegeräten konstruktiv und produktionstechnisch realisierbar macht, und zwar bemerkenswerterweise im Rahmen der heute bei solchen Geräten üblichen Abmessungen.This object is achieved according to the present invention by a hot air blower having the features specified in the characterizing part of patent claim 1. The inventive selection of the heat storage principle known per se for heating the blower air and the division of the air flow into several - preferably 5 to 10 - air ducts passing through the heat storage heating element create a warm air blower that can be used to construct and produce a new type of handy hair care device makes, remarkably within the scope of the dimensions common today in such devices.

In vorteilhafter Ausgestaltung der Erfindung besitzen die Luftkanäle des Heizelementes eine lichte Weite von 5 bis 10 mm, wodurch sowohl bezüglich der Strömungsgeschwindigkeit als auch des Wärmeüberganges und somit der Heizleistung und deren zeitlichen Verlaufes die für tragbare Haarpflegegeräte - insbesondere für Handhaartrockner - zu fordernden günstigen Werte erzielt werden. Zusätzlich kann der Wärmehaushalt des Heizelementes erfindungsgemäß dadurch optimiert werden, daß die Luftkamäle so über seinen Querschnitt verteilt angeordnet sind, daßjedem Luftkanal annähernd die gleiche Menge an wärmespeicherndem Material geometrisch zugeordnet ist, also jedem Luftstrom zur Erwärmung etwa die gleiche gespeicherte Wärmemenge zur Verfügung steht. Diese Bemessung, bei der im allgemeinen gleiche Querschnittsflächen der Luftkanäle vorausgesetzt sind, kann in einer anderen Ausführungsform dahingehend abgewandelt werden, daß die den einzelnen Luftkanälen zugeordneten Teile der Speichermasse unterschiedlichen Querschnittsflächen dieser Luftkanäle proportional sind.In an advantageous embodiment of the invention, the air channels of the heating element have a clear width of 5 to 10 mm, so that the favorable values to be demanded for portable hair care devices - in particular for hand-held hair dryers - are achieved both in terms of the flow rate and the heat transfer and thus the heating power and the time profile thereof will. In addition, the heat balance of the heating element can be optimized according to the invention in that the air channels are so distributed over its cross-section that each air channel is assigned geometrically approximately the same amount of heat-storing material, that is to say that each air stream is heated with approximately the same amount of stored heat. This dimensioning, which generally presupposes the same cross-sectional areas of the air channels, can be modified in another embodiment in such a way that the parts of the storage mass assigned to the individual air channels are proportional to different cross-sectional areas of these air channels.

In einer insbesondere produktionstechnisch vorteilhaften Ausführungsform der Erfindung ist das Heizelement, das beispielsweise aus einer Keramik auf der Basis von A1203 und MgO besteht, in eine der Anzahl der Luftkanäle entsprechende Zahl von je einen Luftkanal enthaltenden Segmenten etwa gleicher Masse unterteilt, wobei die Stoßfugen zwischen diesen Segmenten vorzugsweise mit einer Ausgleichsmasse gefüllt sind. Durch diese Ausgleichsmasse kann zum einen vermieden werden, daß zwischen den Segmenten aufgrund von Unebenheiten ihrer aneinanderstoßenden Flächen ein undefinierter Wärmekontakt besteht; zum anderen kann durch Auswahl einer mehr oder weniger wärmeleitenden Füllmasse, der Wärmehaushalt des gesamten Heizelementes gezielt beeinflußt werden.In a particularly advantageous embodiment of the invention in terms of production technology, the heating element, which consists, for example, of a ceramic based on A1 2 0 3 and MgO, is subdivided into a number corresponding to the number of air channels, each containing segments of approximately the same mass, the air channel Butt joints between these segments are preferably filled with a leveling compound. This balancing mass can on the one hand prevent an undefined thermal contact between the segments due to unevenness in their abutting surfaces; secondly, by selecting a more or less thermally conductive filler, the heat balance of the entire heating element can be influenced in a targeted manner.

Weiterhin wird eine Reihe von Ausführungsformen der Erfindung vorgeschlagen (Ansprüche 7 bis 10), mit denen unterschiedliche Strömungsverläufe der erwärmten Luft erzeugbar sind, so daß unter Berücksichtigung der Anforderungen, die an die mit Warmluftgebläsen auszustattenden Haarpflegegeräte gestellt werden, die jeweils optimale Form ausgewählt werden kann. So kann das Strömungsbild beispielsweise dadurch beeinflußt werden,daß alternativ oder ergänzend zu den üblicherweise geradlinig verlaufenden Luftkanälen verschiedene wendelförmige Kanäle vorgesehen werden, und die Luftkanäle können einen sich von der Lufteintrittsseite zur Luftaustrittsseite ändernden - insbesondere verengenden - Querschnitt besitzen.Furthermore, a number of embodiments of the invention are proposed (claims 7 to 10) with which different flow profiles of the heated air can be generated, so that, taking into account the requirements placed on the hair care devices to be equipped with warm air blowers, the optimum shape can be selected in each case . For example, the flow pattern can be influenced by providing various helical channels as an alternative or in addition to the usually straight-line air channels, and the air channels can have a cross-section that changes from the air inlet side to the air outlet side, in particular narrowing.

Die zur Aufheizung des Heizelementes vorgesehenen elektrischen Heizleiter können innerhalb des Speichermaterials verlaufen, sind jedoch vorzugsweise entlang den Wandungen der Luftkanäle angeordnet, wo sie - z. B. in Form von Draht-Heizspiralen - bei der Herstellung der Heizelemente in die Wandungen der Luftkanäle eingebettet werden. Besonders vorteilhaft ist es im vorliegenden Fall, die Heizleiter in Form von auf die Wandungen der Luftkanäle aufgebrachten Schichten eines elektrischen Widerstandsmaterials auszubilden, wobei insbesondere durch Aufdampfen erzeugte Widerstandsschichten vorgeschlagen werden. Schließlich können die Wandungen der Luftkanäle zur Verringerung des Luftströmungs-Widerstandes mit einer glatten, insbesondere aus einem Lack oder einer Glasur bestehenden Oberflächenschicht versehen sein.The electrical heating conductors provided for heating the heating element can run within the storage material, but are preferably arranged along the walls of the air ducts, where they - e.g. B. in the form of wire heating coils - embedded in the walls of the air ducts in the manufacture of the heating elements. In the present case, it is particularly advantageous to design the heating conductors in the form of layers of an electrical resistance material applied to the walls of the air ducts, resistance layers produced by vapor deposition being proposed in particular. Finally, the walls of the air channels can be used to reduce the air flow resistance with a smooth one, in particular made of a lacquer or one Glaze existing surface layer.

In einer weiteren vorteilhaften Ausführungsform des erfindungsgemäßen Warmluftgebläses ist dessen Wärmespeicher-Heizelement von einem wärmeisolierenden Mantel umgeben, und an dessen Außenseite - jedoch innerhalb des Gerätegehäuses - befindet sich mindestens ein Ansaugkanal, der insbesondere einen ringförmigen, das Heizelement umfassenden Querschnitt besitzt und durch den die vom Gebläse angesaugte Kaltluft entgegen der in den Luftkanälen des Speicherelementes erzeugten Strömungsrichtung zur Lufteintrittsseite des Gebläses geführt wird. Dies Anordnung bewirkt, daß eine Erwärmung der äußeren Oberfläche des wärmeisolierenden Mantels, die trotz dessen wärmedämmender Eigenschaft während der Aufheizphase nicht ganz vermieden werden kann, bei Inbetriebnahme des Gebläses zur Vorwärmung der angesaugten Luft genutzt wird.In a further advantageous embodiment of the hot-air blower according to the invention, its heat storage heating element is surrounded by a heat-insulating jacket, and on the outside thereof - but within the device housing - there is at least one intake duct, which in particular has an annular cross section comprising the heating element and through which the Blower drawn cold air is directed against the flow direction generated in the air channels of the storage element to the air inlet side of the blower. This arrangement has the effect that heating of the outer surface of the heat-insulating jacket, which despite its heat-insulating property cannot be completely avoided during the heating-up phase, is used to preheat the sucked-in air when the fan is started up.

Besonders zweckmäßig ist es, zwischen dem Heizelement und der Ausblasöffnung des Warmluftgebläses eine Mischkammer anzuordnen, in die die Luftkanäle des Heizelementes münden und in der eine Verwirbelung und innige Vermischung der einzelnen Luftströme stattfindet mit dem Ergebnis, daß der die Ausblasöffnung des Gebläses verlassende Luftstrom eine über den gesamten Querschnitt gleichmäßige Temperaturverteilung aufweist.It is particularly expedient to arrange a mixing chamber between the heating element and the blow-out opening of the warm air blower, into which the air channels of the heating element open and in which a swirling and intimate mixing of the individual air streams takes place, with the result that the air flow leaving the blow-out opening of the blower over one the entire cross-section has a uniform temperature distribution.

Zur Aufheizung des Wärmespeicher-Heizelementes sowie zur Aufladung der den Gebläsemotor speisenden Akkumulatoren ist es vorteilhaft, unmittelbar in das Gebläsegehäuse eine Steckereinheit zu integrieren, mit der es an eine entsprechende Steckdose eines Netzgerätes angeschlossen werden kann. Dabei ist es zweckmäßig, zwei Steckkontaktpaare vorzusehen, von denen das eine zur Aufheizung des Heizelementes mittels Netzspannung und das zweite zur Aufladung der elektrischen Akkumulatoren mittels einer in dem Netzgerät erzeugten geeigneten Gleichspannung dient. Dabei kann durch konstruktive Gestaltung der Steckereinheit auf der einen Seite und der Steckdose auf der anderen Seite dafür gesorgt werden, daß diese beiden Teile nur in der richtigen Position ineinander gesteckt werden können, daß also Fehlpolungen vermieden werden. Im Falle der besonders vorteilhaften Verwendung des erfindungsgemäßen Warmluftgebläses als Handhaartrockner, in dem dieses einen sogenannten Pistolengriff aufweist, ist die genannte Steckereinheit zweckmäßig an der Stirnseite des Griffendes angeordnet.To heat the heat storage heating element and to charge the accumulators feeding the blower motor, it is advantageous to integrate a plug unit directly into the blower housing, with which it can be connected to a corresponding socket of a power supply unit. It is expedient to provide two pairs of plug contacts, one of which is used to heat the heating element by means of mains voltage and the second is used to charge the electrical accumulators by means of a suitable DC voltage generated in the mains unit. It can be ensured by constructive design of the plug unit on one side and the socket on the other that these two parts can only be inserted into one another in the correct position, so that incorrect polarity can be avoided. In the case of the particularly advantageous use of the warm air blower according to the invention as a hand-held hair dryer, in which it has a so-called pistol grip, the plug unit mentioned is expediently arranged on the end face of the grip end.

Die Zeichnung veranschaulicht den Erfindungsgegenstand am Beispiel von damit ausgestatteten Handhaartrocknern, und zwar zeigen in teilweise stark vereinfachten Prinzipdarstellungen

  • Figur 1 den Querschnitt eines erfindungsgemäßen Handhaartrockners in seiner Ladeposition, in der der Haartrockner über die in seinen sogenannten Pistolengriff integrierte Steckereinheit mit einem Netzgerät verbunden ist,
  • Figur 2 einen Handhaartrockner, bei dem die Ansaugluft - wie oben erläutert - im Gegenstrom-Prinzip zum Gebläse geführt wird,
  • Figur 3 einen in einem größeren Maßstab wiedergegebenen Querschnitt durch ein erfindungsgemäßes Wärmespeicher-Heizelement.
The drawing illustrates the subject matter of the invention using the example of hand-hair dryers equipped with it, and in fact show in very simplified schematic diagrams
  • 1 shows the cross section of a hand-held hair dryer according to the invention in its loading position, in which the hair dryer is connected to a power supply unit via the plug unit integrated in its so-called pistol grip,
  • FIG. 2 shows a hand-held hair dryer in which the intake air - as explained above - is guided to the blower in the counterflow principle,
  • Figure 3 shows a cross-section reproduced on a larger scale through a heat storage heating element according to the invention.

Wie Figur 1 zeigt, enthält der erfindungsgemäße Handhaartrockner ein von einem wärmeisolierenden Mantel 4-umschlossenes Wärmespeicher-Heizelement 1, das in Richtung seiner Längsachse A von mehreren Luftkanälen 2 durchsetzt ist. Das aus einem Niederspannungs-Gleichstrommotor 5, einem Lüfterrad 6 und einem Nachleitrad 7 bestehende Gebläse drückt die durch das Ansauggitter 8.1 angesaugte Luft durch die Luftkanäle 2. Nachdem die einzelnen Luftströme in den Luftkanälen 2 erwärmt worden sind, gelangen sie in die Mischkammer 18, in der sie durch Verwirbelung innig vermengt werden, so daß der durch die Ausblasöffnung 17 austretende Luftstrom eine über seinen Querschnitt gleichmäßige Temperaturverteilung aufweist.As FIG. 1 shows, the hand hair dryer according to the invention contains a heat storage heating element 1, which is enclosed by a heat-insulating jacket 4 and through which a plurality of air channels 2 is penetrated in the direction of its longitudinal axis A. The fan consisting of a low-voltage DC motor 5, a fan wheel 6 and a guide wheel 7 presses the air sucked in through the intake grille 8.1 through the air channels 2. After the individual air streams in the air channels 2 have been heated, they reach the mixing chamber 18, in which they are intimately mixed by swirling, so that the air stream emerging through the outlet opening 17 has a uniform temperature distribution over its cross section.

Das Gerätegehäuse 9 weist einen sogenannten Pistolengriff 9.1 auf, in dem die zur Speisung des Gebläsemotors dienenden elektrischen Akkumulatoren 14 sowie ein Schalter 15, mit dem über seine Handhabe 15.1 die verschiedenen Betriebszustände des Gerätes eingestellt werden können, untergebracht sind. An seiner Stirnseite weist der Griff 9.1 zwei Steckerpaare 10 und 11 auf, von denen jeweils nur ein Stecker sichtbar ist und über die der Handhaartrockner durch Einführen seines Griffes 9.1 in eine entsprechende Ausnehmung des Ladegerätes 16 mit entsprechenden Buchsenpaaren 12 und 13 des Ladegerätes in elektrischen Kontakt gebracht werden kann. Im Interesse der Übersichtlichkeit der Darstellung wurde die gesamte innere Verdrahtung des Gerätes weggelassen, und auch auf die Wiedergabe der elektrischen Widerstandsheizelemente des Wärmespeichers 2 wurde verzichtet.The device housing 9 has a so-called pistol grip 9.1, in which the electric accumulators 14 serving to supply the blower motor and a switch 15, with which the various operating states of the device can be set via its handle 15.1, are accommodated. On its end face, the handle 9.1 has two connector pairs 10 and 11, of which only one connector is visible and via which the hand-hair dryer by inserting its handle 9.1 into a corresponding recess of the charger 16 with corresponding socket pairs 12 and 13 of the charger in electrical contact can be brought. In the interest of clarity of the illustration, the entire internal wiring of the device has been omitted, and the electrical resistance heating elements of the heat accumulator 2 have also been omitted.

In der in Figur 2 wiedergebenen Ausführungsform ist das Kaltluft-Ansauggitter 8.1 in den Bereich der Ausblasöffnung 17 des Gerätes verlegt, so daß die Luft durch den das Heizelement ringförmig umgebenden Ansaugkanal 8 zur Gebläseeinheit 5, 6, 7 gelangt.In the embodiment shown in FIG. 2, the cold air intake grille 8.1 is moved into the area of the outlet opening 17 of the device, so that the air reaches the blower unit 5, 6, 7 through the intake duct 8 surrounding the heating element.

In Figur 3 ist ein Querschnitt durch eine weiter oben bereits erläuterte bevorzugte Ausführungsform des Wärmespeicher-Heizelementes dargestellt. Das Heizelement besteht hier aus neun je einen Luftkanal 2 enthaltenden Segmenten 1.1, wobei deren Stoßfugen durch eine Ausgleichsmasse 1.2 ausgefüllt ist. Die elektrischen Widerstände zur Erhitzung der Wärmespeicher-Segmente 1.1 besitzen in der dargestellten Ausführungsform die Form von vorzugsweise durch Aufdampfen erzeugten Beschichtungen 3. Zur Verringerung des Strömungswiderstandes weisen die Wandungsoberflächen 2.1 der Luftkanäle 2 einen glatten Überzug auf, der insbesondere aus einem Lack oder einer Glasur besteht.FIG. 3 shows a cross section through a preferred embodiment of the heat storage heating element which has already been explained above. The heating element here consists of nine segments 1.1 each containing an air duct 2, the butt joints of which are filled with a leveling compound 1.2. In the embodiment shown, the electrical resistors for heating the heat storage segments 1.1 have the form of coatings 3 which are preferably produced by vapor deposition. To reduce the flow resistance, the wall surfaces 2.1 of the air ducts 2 have a smooth coating, which consists in particular of a lacquer or a glaze .

Claims (20)

1. A hot air blower for portable hair care appliances suitable for operation independently of the line, including within a handy housing a heating element and a fan wheel which applies an air stream thereto and is driven by a battery-operated electric motor, characterized in that the heating element (1) is a body of a material of high specific heat which is heatable by means of electric heat conductors and has a plurality of air ducts (2) extending therethrough in the longitudinal direction.
2. The hot air blower as claimed in claim 1, characterized in that the number of air ducts (2) is between 5 and 10.
3. The hot air blower as claimed in claim 1 or claim 2, characterized in that the air ducts (2) have a clear width of between 5 and 10 mm.
4. The hot air blower as claimed in any one of the claims 1 to 3, characterized in that the air ducts (2) are distributed over the area of cross section of the heat accumulating heating element (1) in such fashion that each air duct is allocated approximately the same quantity of heat accumulating material.
5. The hot air blower as claimed in claim 4, characterized in that the heating element (1) is subdivided into segments (1.1) of approximately identical mass each containing an air duct, the number of said segments corresponding to the number of air ducts (2).
6. The hot air blower as claimed in claim 5, characterized in that the butt joints intermediate said segments (1.1) are filled with a filling material (1.2).
7. The hot air blower as claimed in any one of the claims 1 to 6, characterized in that the air ducts (2) have an area of cross section narrowing from the air intake side to the air outlet side of the heating element.
8. The hot air blower as claimed in any one of the claims 1 to 7, characterized in that the heating element (1) includes air ducts (2) extending in a straight line in the direction of its longitudinal axis (A).
9. The hot air blower as claimed in any one of the claims 1 to 8, characterized in that the heating element (1) includes air ducts (2) extending in the form of helices arranged concentrically with its longitudinal axis (A).
10. The hot air blower as claimed in claim 9, characterized in that the air ducts (2) extend in the form of helices with continuously varying lead and/or continuously varying lead and/or continuously varying helix diameter.
11. The hot air blower as claimed in any one of the claims 1 to 10, characterized in that the electrical heating conductors for heating the heating element (1) are arranged along the walls of the air ducts (2).
12. The hot air blower as claimed in claim 11, characterized in that the electrical heating conductors are formed of layers (3) of an electrical resistance material that are applied to the walls of the air ducts (2).
13. The hot air blower as claimed in claim 12, characterized in that the resistance layers (3) are produced by vapor-deposition.
14. The hot air blower as claimed in any one of the claims 1 to 13, characterized in that the walls of the air ducts (2) are provided with a smooth surface coating composed in particular of an enamel or glaze.
15. The hot air blower as claimed in any one of the claims 1 to 14, characterized in that the heating element (1) is surrounded by a thermally insulating sheath (4) having on its outside within the housing of the appliance at least one intake duct (8) - in particular of an annular cross section surrounding the heating element (1) -, through which duct the cold air sucked in by the blower structure (5, 6, 7) is directed to the air inlet side of the blower structure (5, 6, 7) in opposition to the direction of flow produced in the air ducts (2).
16. The hot air blower as claimed in any one of the claims 1 to 15, characterized in that between the heating element (1) and the air exit vent (17) a mixing chamber (18) is arranged into which the air ducts (2) open.
17. The hot air blower as claimed in any one of the claims 1 to 16, characterized in that a plug structure (10, 11) is integrated into its housing, for connection to a mating socket structure (12, 13) of a power supply (16) to heat its heating element (1) and to charge its electrical accumulators (14).
18. The hot air blower as claimed in claim 17, characterized in that a first plug pair (10) is provided for heating the heating element (1) by means of line voltage, and a second plug pair (11) is provided for charging the electrical accumulators (14) by means of a suitable DC voltage generated in the power supply (16).
19. The hot air blower as claimed in claim 17 or 18, characterized in that it is equipped with a pistol grip handle (9.1) and that the plug structure (10, 11) is arranged at the end of the handle.
20. The hot air blower as claimed in at least one of the preceding claims, characterized in that the electrical heating element (1) has at least three air ducts (2) extending therethrough.
EP86106373A 1985-05-22 1986-05-09 Fan-assisted air heater Expired - Lifetime EP0203437B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86106373T ATE50483T1 (en) 1985-05-22 1986-05-09 HOT AIR BLOWER FOR INDEPENDENT PORTABLE HAIR CARE DEVICES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853518426 DE3518426A1 (en) 1985-05-22 1985-05-22 WARM AIR BLOWER FOR PORTABLE HAIR CARE DEVICES
DE3518426 1985-05-22

Publications (3)

Publication Number Publication Date
EP0203437A2 EP0203437A2 (en) 1986-12-03
EP0203437A3 EP0203437A3 (en) 1987-01-07
EP0203437B1 true EP0203437B1 (en) 1990-02-28

Family

ID=6271373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106373A Expired - Lifetime EP0203437B1 (en) 1985-05-22 1986-05-09 Fan-assisted air heater

Country Status (7)

Country Link
US (1) US4757183A (en)
EP (1) EP0203437B1 (en)
JP (1) JPS61272004A (en)
AT (1) ATE50483T1 (en)
BR (1) BR8602268A (en)
CA (1) CA1264794A (en)
DE (2) DE3518426A1 (en)

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Also Published As

Publication number Publication date
CA1264794A (en) 1990-01-23
JPS61272004A (en) 1986-12-02
DE3669098D1 (en) 1990-04-05
ATE50483T1 (en) 1990-03-15
US4757183A (en) 1988-07-12
EP0203437A3 (en) 1987-01-07
BR8602268A (en) 1987-01-21
EP0203437A2 (en) 1986-12-03
DE3518426A1 (en) 1986-11-27

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