EP0104344A1 - Electric wire heating element and method of making it - Google Patents

Electric wire heating element and method of making it Download PDF

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Publication number
EP0104344A1
EP0104344A1 EP83107098A EP83107098A EP0104344A1 EP 0104344 A1 EP0104344 A1 EP 0104344A1 EP 83107098 A EP83107098 A EP 83107098A EP 83107098 A EP83107098 A EP 83107098A EP 0104344 A1 EP0104344 A1 EP 0104344A1
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EP
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Prior art keywords
winding
carrier
heating conductor
heating element
carrier plate
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EP83107098A
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German (de)
French (fr)
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EP0104344B1 (en
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Dieter B. Dr. Knoll
Manfred Klawuhn
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Braun GmbH
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Braun GmbH
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base

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  • the invention relates to a method for producing an electrical wire heating element for air heating with a heating conductor support which receives the heating conductor winding and which consists of a plurality of support plates abutting one another at an angle, made of heat-resistant insulating material of the same shape and edge length, the wire-shaped heating conductor being meandering, zigzag-shaped or in the manner of a corrugated strip is.
  • the invention further relates to a wire heating element which can be produced by this method.
  • An electrical wire heating element is known (DE-OS 1.540.731), the heating conductor of which is attached to a heating conductor carrier consisting of at least two mutually abutting, interconnected, plate-shaped carrier elements made of heat-resistant insulating material, the carrier elements being connected by at least one end face each at least one support element, which encompasses and is pressed together on both flat sides and is cross-sectionally U-shaped, is connected to one another.
  • This known wire heating element has the disadvantage that its heating conductor winding takes up a relatively large amount of space, since the individual heating conductor windings cannot be wound as tightly as desired for safety reasons, and on the other hand has the disadvantage of being relatively expensive to manufacture. because especially the u-shaped retaining plates make the assembly more expensive.
  • the invention has for its object to provide a method for producing an electrical wire heating element that allows a particularly tight and thus space-saving winding of the heating conductor. Furthermore, an electrical wire heating element is to be created which does not require any special holding plates.
  • the first-mentioned object is achieved in that the second carrier plate viewed in the winding direction and each further carrier plate arranged parallel to the air flow for the purpose of winding with the heating conductor opposite to that opposite to the winding Direction each arranged in front of the carrier plate is arranged shifted in the longitudinal direction, the carrier plates after winding with the heat conductor are shifted in the longitudinal direction until their front edges facing the air flow direction lie in the same plane.
  • This method has the advantage that the winding can be carried out in such a way that the safety distances between the individual windings can be kept well, but the winding is then shortened in such a way that the overall length of the wire heating element is significantly reduced without the Change the distances between the individual windings.
  • the dimension by which the one carrier plate is displaced in the longitudinal direction relative to the next carrier plate corresponds to the distance by which the one heating conductor coil is separated from the adjacent heating conductor coil.
  • An electrical wire heating element produced by the method according to the invention is characterized in that the carrier plates 1 - 4 are arranged so as to be displaceable relative to one another in the longitudinal direction.
  • all carrier plates have pairs of tabs which extend transversely to the air flow direction and which in openings or engage slots which are arranged in the respectively adjacent carrier plate, the length of the openings or slots being a multiple of the width of a flap.
  • one carrier plate with the inner longitudinal edge is arranged vertically on the side surface of the neighboring carrier plate facing it, all carrier plates together with their inner plate sections enclosing a prismatic space with a square cross section.
  • the individual carrier plates 21, 22, 23, 24 in the exemplary embodiment according to FIG. 3 are provided with tabs 17, 18 which are in slots 19, 20 engage that support plate 21, 22, 23, 24, which is arranged perpendicular to this support plate. If this anchoring between the different pairs of tabs 17, 18 and slots 19, 20 takes place in the sense indicated by arrows in FIG. 3, the four carrier plates 21, 22, 23, 24 are firmly nested.
  • a particularly expedient design of the heating conductor carrier has an offset a per plate which is the same (coil spacing b multiplied by the number of coils 5) divided by (number of plates minus 1).

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  • Resistance Heating (AREA)

Abstract

1. A method of producing an electrical wire heating element for heating a stream of air (B) flowing round the wire heating element, having an element former receiving a heating conductor winding and consisting of a plurality of supporting plates (1, 2, 3, 4) of heat-resistant insulating material of the same shape and edge length disposed in the form of a cross or a star in relation to one another, having a heating conductor (5) in the form of wire which is wound on the supporting plates (1, 2, 3, 4) and is constructed in meandering or zigzag form or in the form of a wave band and which is in contact with radially external edges of the supporting plates (1, 2, 3, 4), wherein the next supporting plate in each case in the direction of winding A is disposed displaced by an amount (a1 ) in the longitudinal direction of the stream of air (B) in relation to the particular supporting plate disposed in front of it, characterised in that, after being wound with the heating conductor (5), the supporting plates (2, 3, 4) are displaced in the longitudinal direction in relation to one another until their edges (6, 7, 8, 9) facing the stream of air lie in one plane.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines elektrischen Drahtheiz-Elements zur Lufterwärmung mit einem die Heizleiterwicklung aufnehmenden Heizleiterträger, der aus mehreren im Winkel aneinanderstoßenden Trägerplatten aus wärmebeständigem Isoliermaterial gleicher Form und Kantenlänge besteht, wobei der drahtförmige Heizleiter mäanderartig, zickzackförmig oder nach Art eines Wellbandes ausgebildet ist. Weiterhin betrifft die Erfindung ein Drahtheizelement, welches nach diesem Verfahren herstellbar ist.The invention relates to a method for producing an electrical wire heating element for air heating with a heating conductor support which receives the heating conductor winding and which consists of a plurality of support plates abutting one another at an angle, made of heat-resistant insulating material of the same shape and edge length, the wire-shaped heating conductor being meandering, zigzag-shaped or in the manner of a corrugated strip is. The invention further relates to a wire heating element which can be produced by this method.

Es ist ein elektrisches Drahtheiz-Element bekannt (DE-OS 1.540.731), dessen Heizleiter auf einem aus mindestens zwei im Winkel aneinanderstoßenden, miteinander verbundenen, plattenförmigen Trägerelementen aus wärmebeständigem Isoliermaterial bestehenden Heizleiterträger angebracht ist, wobei die Trägerelemente durch mindestens je ein jede Stirnseite mindestens eines Trägerelementes nach beiden Flachseiten umgreifendes und damit verpreßtes, im Querschnitt u-förmiges Halteblech miteinander verbunden sind. Dieses bekannte Drahtheiz-Element hat den Nachteil, daß seine Heizleiter-Wicklung einen relativ großen Platzbedarf aufweist, da die einzelnen Heizleiter-Windungen aus Sicherheitsgründen nicht beliebig eng gewickelt werden können, und hat zum anderen den Nachteil, relativ teuer in der Herstellung zu sein, da besonders die u-förmigen Haltebleche die Montage verteuern.An electrical wire heating element is known (DE-OS 1.540.731), the heating conductor of which is attached to a heating conductor carrier consisting of at least two mutually abutting, interconnected, plate-shaped carrier elements made of heat-resistant insulating material, the carrier elements being connected by at least one end face each at least one support element, which encompasses and is pressed together on both flat sides and is cross-sectionally U-shaped, is connected to one another. This known wire heating element has the disadvantage that its heating conductor winding takes up a relatively large amount of space, since the individual heating conductor windings cannot be wound as tightly as desired for safety reasons, and on the other hand has the disadvantage of being relatively expensive to manufacture. because especially the u-shaped retaining plates make the assembly more expensive.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung eines elektrischen Drahtheiz-Elementes zu schaffen, das eine besonders enge und damit platzsparende Wicklung des Heizleiters erlaubt. Weiterhin soll ein elektrisches Drahtheizelement geschaffen werden, das ohne besondere Haltebleche auskommt.The invention has for its object to provide a method for producing an electrical wire heating element that allows a particularly tight and thus space-saving winding of the heating conductor. Furthermore, an electrical wire heating element is to be created which does not require any special holding plates.

Nach der Erfindung wird die erstgenannte Aufgabe dadurch gelöst, daß die in Wickelrichtung betrachtet zweite Trägerplatte und jede weitere parallel zum Luftstrom angeordnete Trägerplatte zum Zwecke der Bewicklung mit dem Heizleiter gegenüber der entgegengesetzt zur Wickelrichtung jeweils davor angeordneten Trägerplatte um ein Maß in Längsrichtung verschoben angeordnet wird, wobei die Trägerplatten nach dem Bewickeln mit dem Heizleiter in Längsrichtung verschoben werden, bis ihre vorderen, der Luftströmungsrichtung zugekehrten Kanten in gleicher Ebene liegen.According to the invention, the first-mentioned object is achieved in that the second carrier plate viewed in the winding direction and each further carrier plate arranged parallel to the air flow for the purpose of winding with the heating conductor opposite to that opposite to the winding Direction each arranged in front of the carrier plate is arranged shifted in the longitudinal direction, the carrier plates after winding with the heat conductor are shifted in the longitudinal direction until their front edges facing the air flow direction lie in the same plane.

Dieses Verfahren hat den Vorteil, daß die Bewicklung so durchgeführt werden kann, daß die Sicherheitsabstände zwischen den einzelnen Wicklungen gut einzuhalten sind, wobei aber anschließend die Bewicklung so verkürzt wird, daß die Gesamtlänge des Draht-Heizelementes sich deutlich verkleinert, ohne daß sich gleichzeitig die Abstände zwischen den einzelnen Wicklungen verändern.This method has the advantage that the winding can be carried out in such a way that the safety distances between the individual windings can be kept well, but the winding is then shortened in such a way that the overall length of the wire heating element is significantly reduced without the Change the distances between the individual windings.

Zweckmäßigerweise entspricht das maß, um das jeweils die eine Trägerplatte gegenüber der nächsten Trägerplatte in Längsrichtung verschoben ist, dem Abstand, um den jeweils der eine Heizleiterwickel vom benachbarten Heizleiterwickel entfernt ist.Expediently, the dimension by which the one carrier plate is displaced in the longitudinal direction relative to the next carrier plate corresponds to the distance by which the one heating conductor coil is separated from the adjacent heating conductor coil.

Auf diese Weise ist es also möglich, bei einem Draht-Heizelement mit vier sternförmig zueinander angeordneten Trägerplatten nach dem Bewicklungsvorgang die Gesamtlänge des Draht-Heizelementes um den dreifachen Wickel abstand zu verringern.In this way it is possible to reduce the total length of the wire heating element by three times the winding distance in a wire heating element with four carrier plates arranged in a star shape relative to one another.

Ein nach dem erfindungsgemäßen Verfahren hergestelltes elektrisches Drahtheiz-Element zeichnet sich dadurch aus, daß die Trägerplatten 1 - 4 gegeneinander in Längsrichtung verschieblich angeordnet sind.An electrical wire heating element produced by the method according to the invention is characterized in that the carrier plates 1 - 4 are arranged so as to be displaceable relative to one another in the longitudinal direction.

Damit sichergestellt ist, daß alle Trägerplatten zu einem Wickelkörper zusammenfügbar sind, der in sich steif und fest genug ist, um mit dem Heizleiter bewickelt werden zu können, haben gemäß einem bevorzugten Ausführungsbeispiel der Erfindung alle Trägerplatten Paare von sich quer zur Luftströmungsrichtung erstreckenden Lappen, die in Öffnungen oder Schlitze eingreifen, die in der jeweils benachbarten Trägerplatte angeordnet sind, wobei die Länge der Öffnungen oder Schlitze ein Mehrfaches der Breite eines Lappens beträgt. Damit erhält man ein Drahtheiz-Element, das eine Bewicklung mit sehr geringem Wickelabstand ermöglicht und keine Haltebleche an den Stirnseiten benötigt.In order to ensure that all carrier plates can be joined together to form a winding body which is inherently stiff and strong enough to be wound with the heating conductor, according to a preferred exemplary embodiment of the invention, all carrier plates have pairs of tabs which extend transversely to the air flow direction and which in openings or engage slots which are arranged in the respectively adjacent carrier plate, the length of the openings or slots being a multiple of the width of a flap. This results in a wire heating element that enables winding with a very small winding distance and does not require any holding plates on the end faces.

Mit Vorteil ist jeweils die eine Trägerplatte mit der innen liegenden Längskante lotrecht auf der ihr zugekehrten Seitenfläche der benachbarten Trägerplatte angeordnet, wobei alle Trägerplatten zusammen mit ihren innenliegenden Plattenabschnitten einen prismatischen Raum mit quadratischem Querschnitt einschließen.Advantageously, one carrier plate with the inner longitudinal edge is arranged vertically on the side surface of the neighboring carrier plate facing it, all carrier plates together with their inner plate sections enclosing a prismatic space with a square cross section.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnungen näher erläutert. Es zeigt:

  • Figur 1 - ein elektrisches Drahtheiz-Element (in perspektivischer Darstellung) mit vier winklig aufeinanderstoßenden Trägerplatten, wobei die einzelnen Trägerplatten 1<Längsrichtung gegeneinander verschoben angeordnet sind (Anordnung beim Bewickeln);
  • Figur 2 - das Drahtheiz-Element nach Figur 1, bei dem jedoch die einzelnen Trägerplatten so verschoben sind, daß ihre dem Luftstrom zugekehrten vorderen Kanten in gleicher Höhe liegen (fertiges Drahtheiz-Element);
  • Figur 3 - eine "Explosionszeichnung" eines aus vier Trägerplatten zusammensteckbaren Drahtheiz-Elementes;
  • Figur 4 - eine einzige Trägerplatte in perspektivischer Ansicht des Drahtheiz-Elementes gemäß Figur 3;
  • Figur 5 - die Frontansicht (in Luftströmungsrichtung gesehen) des Drahtheiz-Elementes gemäß Figur 3;
  • Figur 6 - die Anordnung zweier Trägerplatten zueinander in perspektivischer Ansicht.
The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment. It shows:
  • Figure 1 - an electrical wire heating element (in a perspective view) with four angularly abutting support plates, the individual support plates 1 <longitudinal direction are arranged offset from each other (arrangement during winding);
  • Figure 2 - the wire heating element of Figure 1, but in which the individual carrier plates are displaced so that their front edges facing the air flow are at the same height (finished wire heating element);
  • Figure 3 - an "exploded view" of a wire heating element which can be plugged together from four carrier plates;
  • Figure 4 - a single support plate in a perspective view of the wire heating element according to Figure 3;
  • Figure 5 - the front view (seen in the air flow direction) of the wire heating element according to Figure 3;
  • Figure 6 - the arrangement of two carrier plates to each other in a perspective view.

Das Drahtheiz-Element nach Figur 1 besteht aus vier Trägerplatten 1, 2, 3, 4, die sternförmig zueinander angeordnet sind, wobei zum Zwecke der Umwicklung der Trägerplatten mit dem Heizleiter 5 die Trägerplatten 2, 3 und 4 gegenüber der Trägerplatte 1 in Luftströmungsrichtung B verschoben sind. Es ist dabei die Trägerplatte 2 gegenüber der Trägerplatte 1 um das Maß 2 x al (= a2) verschoben und die Trägerplatte 4 gegenüber der Trägerplatte 1 um das Maß 3 x al (= a3).The wire heating element according to Figure 1 consists of four carrier plates 1, 2, 3, 4, which are arranged in a star shape to each other, wherein for the purpose of wrapping the carrier plates with the heating conductor 5, the carrier plates 2, 3 and 4 with respect to the carrier plate 1 in the air flow direction B. are moved. It is the carrier plate 2 relative to the carrier plate 1 by the dimension 2 xa l (= a 2 ) displaced and the carrier plate 4 relative to the carrier plate 1 by the dimension 3 xa l (= a 3 ).

Werden nun, wie dies Figur 2 zeigt, alle Trägerplatten 1, 2, 3, 4 nach dem Bewickeln so verschoben (entgegen Pfeilrichtung B), daß sich ihre vorderen, dem Luftstrom zugekehrten Kanten 6, 7, 8, 9 auf gleicher Ebene befinden, also bündig abschließen, so verschieben sich die Flankenlager f2, f3, f4, an denen der Heizleiter 5 die radial außen liegenden Kanten der Trägerplatten 2, 3, 4 berührt, entgegen Pfeilrichtung B zur Kante 6 hin, und die Gesamtlänge L1 des Drahtheiz- Elementes verkürzt sich auf die Länge L.If, as shown in FIG. 2, all carrier plates 1, 2, 3, 4 are then moved after winding (in the opposite direction to arrow B) so that their front edges 6, 7, 8, 9 facing the air flow are on the same level, So close flush, the flank bearings f2, f3, f4, on which the heating conductor 5 touches the radially outer edges of the carrier plates 2, 3, 4, move towards the edge 6 in the opposite direction of the arrow B, and the total length L 1 of the wire heating Element shortens to length L.

Um eine preiswerte Befestigung der einzelnen Trägerplatten aneinander in dem in den Figuren 1 und 2 dargestellten Schema zu schaffen, sind die einzelnen Trägerplatten 21, 22, 23, 24 beim Ausführungsbeispiel nach Figur 3 mit Lappen 17, 18 versehen, die in Schlitze 19, 20 derjenigen Trägerplatte 21, 22, 23, 24 eingreifen, die jeweils lotrecht zu dieser Trägerplatte angeordnet ist. Wenn diese Verankerung zwischen den verschiedenen Paaren von Lappen 17, 18 und Schlitzen 19, 20 in dem in Figur 3 durch Pfeile angedeuteten Sinn erfolgt, ergibt sich eine feste Verschachtelung der vier Trägerplatten 21, 22, 23, 24.In order to provide inexpensive fastening of the individual carrier plates to one another in the scheme shown in FIGS. 1 and 2, the individual carrier plates 21, 22, 23, 24 in the exemplary embodiment according to FIG. 3 are provided with tabs 17, 18 which are in slots 19, 20 engage that support plate 21, 22, 23, 24, which is arranged perpendicular to this support plate. If this anchoring between the different pairs of tabs 17, 18 and slots 19, 20 takes place in the sense indicated by arrows in FIG. 3, the four carrier plates 21, 22, 23, 24 are firmly nested.

Beim Zusammenfügen der vier Trägerplatten 21, 22, 23, 24 werden die einzelnen Platten nach Art einer aufsteigenden Schraube angeordnet, was dadurch ermöglicht wird, daß die Schlitze 19, 20, ... alle so lang ausgebildet sind (1 = 4 x d), daß die Lappen 17, 18, ... in diesen Schlitzen verschiebbar sind. Nach dem Bewickeln werden die Trägerplatten so weit zurückverschoben, daß die Lappen 17, 18, ... mit ihren vorderen Kanten 25, 26 an den vorderen Kanten, 29, 30, ... der Schlitze 25, 26, ... anliegen.When the four carrier plates 21, 22, 23, 24 are joined together, the individual plates are arranged in the manner of an ascending screw, which is made possible by the fact that the slots 19, 20, ... are all made so long (1 = 4 xd), that the tabs 17, 18, ... are slidable in these slots. After winding, the carrier plates are pushed back so far that the tabs 17, 18, ... with their front edges 25, 26 abut the front edges, 29, 30, ... of the slots 25, 26, ....

Eine besonders zweckmäßige Ausbildung des Heizleiterträgers weist einen Versatz a je Platte auf, der gleich ist (Wendelabstand b multipliziert mit der Anzahl der Wendel 5) geteilt durch (Plattenzahl minus 1).A particularly expedient design of the heating conductor carrier has an offset a per plate which is the same (coil spacing b multiplied by the number of coils 5) divided by (number of plates minus 1).

Claims (6)

1. Verfahren zur Herstellung eines elektrischen Drahtheizelementes zur Lufterwärmung mit einem die Heizleiterwicklung aufnehmenden Heizleiterträger, der aus mehreren im Winkel aneinanderstoßenden Trägerplatten aus wärmebeständigem Isoliermaterial gleicher Form und Kantenlänge besteht, wobei der drahtförmige Heizleiter mäanderartig, zickzackförmig oder nach der Art eines Wellbandes ausgebildet ist, dadurch gekennzeichnet, daß die (in Wickelrichtung A betrachtet) zweite Trägerplatte (2) und jede weitere parallel zum Luftstrom (B) angeordnete Trägerplatte (3, 4) zum Zwecke der Bewicklung mit dem Heizleiter (5) gegenüber der (entgegengesetzt zur Wickelrichtung A betrachtet) jeweils davor angeordneten Trägerplatte (1, 2, 3) um ein Maß (al, a2, a3) in Längsrichtung (Pfeilrichtung B) verschoben angeordnet wird, und daß die Trägerplatten (2, 3, 4) nach dem Bewickeln mit dem Heizleiter (5) soweit in Längsrichtung (entgegen der Pfeilrichtung B) bewegt werden, bis ihre vorderen, der Luftströmungsrichtung (B) zugekehrten Kanten (6, 7, 8, 9) in gleicher Ebene liegen.1. A method for producing an electrical wire heating element for air heating with a heating conductor carrier which receives the heating conductor winding and which consists of a plurality of mutually abutting carrier plates made of heat-resistant insulating material of the same shape and edge length, the wire-shaped heating conductor being meandering, zigzag-shaped or in the manner of a corrugated strip, thereby characterized in that (viewed in winding direction A) the second carrier plate (2) and each further carrier plate (3, 4) arranged parallel to the air flow (B) for the purpose of winding with the heating conductor (5) opposite that (viewed in the opposite direction to winding direction A) each arranged in front of the carrier plate (1, 2, 3) by a dimension (a l , a 2 , a3) in the longitudinal direction (arrow direction B) is displaced, and that the carrier plates (2, 3, 4) after winding with the heat conductor (5) so far in the longitudinal direction (against the direction of arrow B) until their front, the air flow direction (B) facing edges (6, 7, 8, 9) lie in the same plane. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Maß (al, a2, a3), um das jeweils die eine Trägerplatte (2, 3, 4) gegenüber der nächsten Trägerplatte zum Zwecke der Bewicklung verschoben wird, dem Abstand (b) entspricht, um den jeweils der eine Heizleiterwickel (5.1) vom benachbarten Heizleiterwickel (5.2) entfernt ist.2. The method according to claim 1, characterized in that the dimension (a l , a 2 , a 3 ) by which the one carrier plate (2, 3, 4) is shifted relative to the next carrier plate for the purpose of winding, the distance (b) corresponds to the one heating conductor winding (5.1) from the neighboring heating conductor winding (5.2). 3. Elektrisches Drahtheizelement, welches nach dem Verfahren gemäß der Ansprüche 1 oder 2 herstellbar ist und einen die Heizleiterwicklung aufnehmenden Heizleiterträger hat der aus mehreren im Winkel aneinanderstoßenden Trägerplatten aus wärmebeständigem Isoliermaterial gleicher Form und Kantenlänge besteht, wobei der drahtförmige Heizleiter mäanderartig, zickzackförmig oder nach Art eines Wellbandes ausgebildet ist, dadurch gekennzeichnet, daß die Trägerplatten (1-4) gegeneinander in Längsrichtung verschieblich angeordnet sind.3. Electric wire heating element, which can be produced by the method according to claims 1 or 2 and has a heating conductor winding receiving the heating conductor carrier which has a plurality of mutually abutting carrier plates made of heat-resistant insulating material of the same shape and edge length exists, the wire-shaped heating conductor being meandering, zigzag or in the manner of a corrugated strip, characterized in that the carrier plates (1-4) are arranged so as to be displaceable in relation to one another in the longitudinal direction. 4. Elektrisches Drahtheizelement nach Anspruch 3, dadurch gekennzeichnet, daß die Trägerplatten (1, 2, 3, 4) Paare von sich quer zur Luftströmungsrichtung (B) erstreckenden Lappen (17, 18) aufweisen, die die Öffnungen oder Schlitze (19, 20) eingreifen, die in der jeweils benachbarten Trägerplatte angeordnet sind, wobei deren Länge (1) ein Mehrfaches der Breite (d) eines Lappens (17, 18) beträgt.4. Electrical wire heating element according to claim 3, characterized in that the carrier plates (1, 2, 3, 4) have pairs of flaps (17, 18) which extend transversely to the air flow direction (B) and which have the openings or slots (19, 20th ) engage, which are arranged in the adjacent carrier plate, the length (1) of which is a multiple of the width (d) of a flap (17, 18). 5. Elektrisches Drahtheizelement nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die eine Trägerplatte (1, 2, 3) mit ihrer innenliegenden Längskante (12) lotrecht auf der ihr zugekehrten Seitenfläche der benachbarten Trägerplatte (2, 3, 4) angeordnet ist, wobei alle Trägerplatten (1, 2,"3, 4) zusammen einen prismatischen Raum (11) mit quadratischem Querschnitt einschließen.5. Electric wire heating element according to claim 3 or 4, characterized in that the one carrier plate (1, 2, 3) with its inner longitudinal edge (12) is arranged perpendicularly on the side surface of the adjacent carrier plate (2, 3, 4) facing it, wherein all carrier plates (1, 2, "3, 4) together enclose a prismatic space (11) with a square cross section. 6. Elektrisches Drahtheizelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Maß a gleich ist (dem Wendel abstand b multipliziert mit der Anzahl der Wendel 5) geteilt durch (Plattenzahl minus 1).6. Electrical wire heating element according to one of the preceding claims, characterized in that the dimension a is the same (the spiral distance b multiplied by the number of the spiral 5) divided by (number of plates minus 1).
EP83107098A 1982-08-31 1983-07-20 Electric wire heating element and method of making it Expired EP0104344B1 (en)

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DE3232291 1982-08-31
DE19823232291 DE3232291A1 (en) 1982-08-31 1982-08-31 METHOD FOR PRODUCING AN ELECTRIC WIRE HEATING ELEMENT AND WIRE HEATING ELEMENT, WHICH CAN BE PRODUCED BY THIS METHOD

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EP0104344A1 true EP0104344A1 (en) 1984-04-04
EP0104344B1 EP0104344B1 (en) 1987-04-01

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Citations (4)

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US1490088A (en) * 1921-07-14 1924-04-15 Airdry Corp Air heater
DE1540731A1 (en) * 1965-07-02 1969-12-11 Eichenauer Fa Fritz Electric wire heating element
DE2128157A1 (en) * 1970-08-18 1972-02-24 Suhl Elektrogeraete Veb K Radiators for heating a stream of air, especially for hair dryers
EP0038414A1 (en) * 1980-04-18 1981-10-28 Braun Aktiengesellschaft Electric wire heating element

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1490089A (en) * 1921-09-28 1924-04-15 Airdry Corp Air heater
DE3003267A1 (en) * 1980-01-30 1981-09-10 Fa. Friedrich Würth, 7000 Stuttgart Heating element for hair-dryer etc. - is placed in longitudinal channels with frame composed of four insulated plates joined at slits to form channels
DE3031373A1 (en) * 1980-08-20 1982-04-01 Braun Ag, 6000 Frankfurt Heater element for hot air fan - has wire supporting mica strips, and forming integral body divided by corresponding number of heating wire coils
DE3031351C2 (en) * 1980-08-20 1987-04-02 Braun Ag, 6000 Frankfurt Hot air shower

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1490088A (en) * 1921-07-14 1924-04-15 Airdry Corp Air heater
DE1540731A1 (en) * 1965-07-02 1969-12-11 Eichenauer Fa Fritz Electric wire heating element
DE2128157A1 (en) * 1970-08-18 1972-02-24 Suhl Elektrogeraete Veb K Radiators for heating a stream of air, especially for hair dryers
EP0038414A1 (en) * 1980-04-18 1981-10-28 Braun Aktiengesellschaft Electric wire heating element

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DE3232291A1 (en) 1984-03-01
EP0104344B1 (en) 1987-04-01
DE3370741D1 (en) 1987-05-07

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