EP1718115A1 - Tubular heating element with a conical heating spiral conductor - Google Patents

Tubular heating element with a conical heating spiral conductor Download PDF

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Publication number
EP1718115A1
EP1718115A1 EP06007617A EP06007617A EP1718115A1 EP 1718115 A1 EP1718115 A1 EP 1718115A1 EP 06007617 A EP06007617 A EP 06007617A EP 06007617 A EP06007617 A EP 06007617A EP 1718115 A1 EP1718115 A1 EP 1718115A1
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EP
European Patent Office
Prior art keywords
heizleiterwendel
region
diameter
heating conductor
tubular heater
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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.)
Granted
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EP06007617A
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German (de)
French (fr)
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EP1718115B1 (en
Inventor
Gernot Teufl
Andreas Pleschinger
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Bleckmann GmbH and Co KG
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Bleckmann GmbH and Co KG
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Priority to PL06007617T priority Critical patent/PL1718115T3/en
Publication of EP1718115A1 publication Critical patent/EP1718115A1/en
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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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49083—Heater type

Definitions

  • the present invention relates to a tubular heater for heating flowable media, in particular a tubular heater for household appliances according to the preamble of claim 1 and a Schuleiterhausl for a tubular heater according to the preamble of claim 10.
  • tubular heaters find everywhere use where a flowable medium is to heat. This is particularly the case with various household appliances, such as laundry washing machines, dishwashers, coffee machines, etc.
  • the length of the tubular heater and the diameter of its Schuleiterchtl, whereby its heating power is co-determined, depending on the desired performance characteristics are determined freely, since the available installation space for the tubular heater is not limited. Only in the area of the terminal ends of this tubular heater is a reduction of the heating power necessary because these areas are only partially or not at all washed by the medium to be heated, so that the heat generated there is not sufficiently dissipated. Thus, if the same heating power as in the remaining region of the tubular heating element would be generated in the region of the connection ends, this could lead to damage cause the heating coil to overheat. Therefore, in the connection area of the tubular heater, the connection elements, such as connecting bolts, etc., are guided into the interior of the jacket tube in order to prevent heat generation there. Therefore, the terminal end portions of the tubular heaters are also referred to as cold ends.
  • the heating conductor coil located in the interior of the jacket tube of the tubular heating element also experiences a curvature along its longitudinal axis, which leads to undefined deformation in the heating conductor coil. Furthermore, it comes to displacements of the coil, which leads by uneven introduction of heat to locally overheated areas.
  • FIG. 4 the terminal end portion of a known tubular heater is shown.
  • This tubular heater has a Bankleiterchtl 22 ', which is embedded in a jacket tube 10' in an electrically insulating material 20 '.
  • the Schuleiter Listel 22' Via a connecting bolt 24 ', the Schuleiter Listel 22' is connected on this side with a power source.
  • the connecting bolt In order to avoid that the individual filament of Bankleiter Maisl 22 'take an undefined position in the region of the bend or bend 18', the connecting bolt is guided beyond the curvature region of the jacket tube 10 'further into the interior of the tubular heater and the Schuleiter Maisl 22' only there connected to the connecting bolt 24 '.
  • the heating power is further reduced, since only in the region of the heating conductor 22 'a corresponding heating power is available.
  • the diameter of the Edelleiterhausl 22 ' is adapted to the diameter of the connecting bolt 24'. Since the diameter of the bolt 24 'in relation to the inner diameter of the jacket tube 10' is low, even a small heating power can be achieved with given upper shell diameter.
  • the increase in the diameter of the heating conductor spiral, starting from the free end of the heating conductor spiral can take place at least in sections in the direction of the working region, at least in sections.
  • the increase in diameter of the Edelleiter Listel takes place at least partially leaps and bounds.
  • the Schwarzleiter mindfull, starting from the free end initially has a constant diameter, then the diameter increases steadily or suddenly in the direction of the work area, then in a constant Diameter, which extends over the entire work area to pass.
  • the sudden increase in the diameter in the connection end region of the heating conductor spiral can be effected by providing one or more step-like enlargements of the diameter of the heating conductor spiral.
  • the helical pitch of Schuleiter Listel is constant in this area.
  • the spiral pitch of the heating conductor coil in the region of at least one connection end region is at least partially variable.
  • connection element very different components can be used.
  • a particularly favorable connecting element is provided by a connecting bolt formed from a highly electrically conductive material, wherein the terminal bolt is inserted into the interior of the Edelleiter Listel and whose outer diameter corresponds at least in the region of the terminal end of the Schuleiterchtl the inner diameter of the Schuleiter Listel in this area.
  • the diameter of the heating conductor coil in the region of the connection element is constant.
  • an inventive electric tubular heater R is shown schematically.
  • This first comprises a jacket tube 10 made of a good heat-conducting material, such as aluminum or corrosion-resistant steel on.
  • the jacket tube 10, and thus the tubular heater R can be brought into a favorable shape for the particular application.
  • the jacket tube 10 is bent into an open circular ring.
  • the jacket tube 10 may have different cross-sectional profiles.
  • the jacket tube 10 here has a substantially square cross section, wherein the corners of the square are flattened.
  • the tubular heater R has two terminal end portions 12, 14, via which the tubular heater R is connectable to a power source, not shown. Between the two connection end regions 12, 14 there extends a main heat emission region 16 of the tubular heater R. In the region of the two connection ends 12, 14, the tubular heater R is in each case formed with an offset 18. As a result, the connection end regions 12, 14 can be led out of the plane of the main heat emission region 16 of the tubular heater R upwards, thereby facilitating contact with the current source.
  • Fig. 2 From Fig. 2 it can be seen that in the jacket tube 10, an electrically insulating, but thermally conductive material 20, such as magnesium oxide is filled, which may optionally be compressed by a rolling and / or pressing.
  • the insulating material 20 encloses a Schuleiter Listel 22, which is shown in Fig. 2 schematically and in Fig. 3 in detail.
  • the wound Schuleiterhausl 22 has a connection portion 22a and a working area 22b, which at least approximately corresponds to the already mentioned above main heat output portion 16 of the tubular heater R.
  • the heating coil 22 viewed from its free end 22c, has a first portion 22d of constant diameter.
  • a second section 22e in which the diameter of the heating coil 22 is uniformly from the diameter in the first section 22d to a Diameter increases, which then continues constantly in the work area 22b.
  • the heating coil 22 has a pitch smaller than the pitch in the second portion 22e of the terminal portion 22a and the working portion 22d.
  • the pitch of the heating coil 22 in the second portion 22e of the terminal portion 22a may be different from that of the working portion.
  • the heating coil 22 also gives off heat in its connection region 22a, but the heat emission in this region is reduced in comparison with the working region 22b of the heating coil 22.
  • the heating coil 22 may be configured at its other end as well, as has been described above in connection with the end shown in Fig. 2.
  • the heating coil 22 is connected via a connecting bolt 24 with the outside of the tubular heater R.
  • the connecting bolt 24 is made of a good electrically conductive material and has a substantially cylindrical cross section with a constant diameter.
  • the connecting bolt 24 is guided for bearing fixation by an insulating bead 26 made of ceramic or a similar material.
  • the connection between the heating coil 22 in the region of the first portion 22d of the connection region 22a and the connection bolt 24 is effected by welding.
  • the heating coil 22 is curved in the connection end region 12 of the tubular heater R along its longitudinal axis L and thus follows the bend 18 of the tubular heater R.

Abstract

The pipe heater (R) includes heating coil (22) that has two contact areas that are curved with respect to a longitudinal axis, and a work area formed between the contact areas to extend the contact areas. The diameter of the heating coil increases from one contact area towards the work area. The heating coil is embedded in an electrical isolation material (20), and arranged inside the jacket pipe (10) of a household appliance. A connector (24) couples the heating coil to a power source. An independent claim is included for the heating coil.

Description

Die vorliegende Erfindung betrifft einen Rohrheizkörper zum Erwärmen fließfähiger Medien, insbesondere einen Rohrheizkörper für Haushaltsgeräte gemäß dem Oberbegriff des Anspruchs 1 sowie eine Heizleiterwendel für einen Rohrheizkörper gemäß dem Oberbegriff des Anspruchs 10.The present invention relates to a tubular heater for heating flowable media, in particular a tubular heater for household appliances according to the preamble of claim 1 and a Heizleiterwendel for a tubular heater according to the preamble of claim 10.

Derartige Rohrheizkörper finden überall dort Verwendung, wo ein fließfähiges Medium zu erhitzen ist. Dies ist insbesondere bei verschiedenen Haushaltsgeräten der Fall, wie Wäschewaschmaschinen, Geschirrspülmaschinen, Kaffeemaschinen usw.Such tubular heaters find everywhere use where a flowable medium is to heat. This is particularly the case with various household appliances, such as laundry washing machines, dishwashers, coffee machines, etc.

Bei einigen dieser Anwendungen kann die Länge des Rohrheizkörpers und der Durchmesser seiner Heizleiterwendel, wodurch seine Heizleistung mitbestimmt wird, je nach den gewünschten Leistungsmerkmalen frei festgelegt werden, da der zur Verfügung stehende Einbauraum für den Rohrheizkörper keiner Einschränkung unterliegt. Lediglich im Bereich der Anschlussenden dieser Rohrheizkörper ist eine Reduzierung der Heizleistung notwendig, da diese Bereiche nur teilweise oder überhaupt nicht von dem zu erwärmenden Medium umspült werden, so dass die dort erzeugte Wärme nicht ausreichend abgeführt wird. Würde also im Bereich der Anschlussenden die gleiche Heizleistung wie in dem übrigen Bereich des Rohrheizkörpers erzeugt werden, könnte dies zu einer Beschädigung der Heizwendel durch Überhitzung führen. Deshalb werden im Anschlussbereich des Rohrheizkörpers die Anschlusselemente, wie Anschlussbolzen usw. mit in das Innere des Mantelrohres geführt, um dort die Wärmeerzeugung zu unterbinden. Daher werden die Anschlussendenbereiche der Rohrheizkörper auch als kalte Enden bezeichnet.In some of these applications, the length of the tubular heater and the diameter of its Heizleiterwendel, whereby its heating power is co-determined, depending on the desired performance characteristics are determined freely, since the available installation space for the tubular heater is not limited. Only in the area of the terminal ends of this tubular heater is a reduction of the heating power necessary because these areas are only partially or not at all washed by the medium to be heated, so that the heat generated there is not sufficiently dissipated. Thus, if the same heating power as in the remaining region of the tubular heating element would be generated in the region of the connection ends, this could lead to damage cause the heating coil to overheat. Therefore, in the connection area of the tubular heater, the connection elements, such as connecting bolts, etc., are guided into the interior of the jacket tube in order to prevent heat generation there. Therefore, the terminal end portions of the tubular heaters are also referred to as cold ends.

Bei Anwendungsgebieten, bei denen für den Rohrheizkörper nur ein geringer Einbauraum vorhanden ist und trotzdem eine hohe Heizleistung gefordert wird, werden die vorstehend skizzierten Probleme erheblich verstärkt. Um einen guten Wärmeübergang zum Rohrmantel erzielen zu können, kann es u.a. notwendig sein, den Durchmesser der Heizleiterwendel entsprechend zu vergrößern. Dies hat aber dann im Bereich der Anschlussenden zur Folge, dass dort ebenfalls eine große Heizleistung vorhanden ist, was zu den bereits vorstehend skizzierten Problemen führen kann. Darüber hinaus kann es bei derartigen Rohrheizkörpern, d.h. Rohrheizkörpern mit kurzer Baulänge und großen Heizleistungen, häufig dazu kommen, dass im Bereich der Anschlussenden des Rohrheizkörpers dieser abgekröpft ist, um dessen Anschlusselemente für eine einfach herzustellende Verbindung mit einer Spannungsquelle verfügbar zu haben. Bei einer Abkröpfung erfährt auch die im Inneren des Mantelrohrs des Rohrheizkörpers befindliche Heizleiterwendel eine Krümmung entlang Ihrer Längsachse, was bei der Heizleiterwendel zu undefinierten Verformung führt. Weiterhin kommt es zu Verlagerungen der Wendel, welche durch ungleichmäßige Einbringung der Wärme zu lokal überhitzten Bereichen führt.In application areas in which only a small installation space is available for the tubular heater and still a high heat output is required, the problems outlined above are significantly enhanced. In order to achieve a good heat transfer to the pipe jacket, it may u.a. be necessary to increase the diameter of the Heizleiterwendel accordingly. However, this then has the consequence in the area of the connection ends that there is also a large heating power, which can lead to the problems outlined above. Moreover, with such tubular heaters, i. Tubular heaters with a short overall length and high heating capacities, often come in the region of the terminal ends of the tubular heater this is bent to have its connection elements for easy to connect to a voltage source available. In the case of a bend, the heating conductor coil located in the interior of the jacket tube of the tubular heating element also experiences a curvature along its longitudinal axis, which leads to undefined deformation in the heating conductor coil. Furthermore, it comes to displacements of the coil, which leads by uneven introduction of heat to locally overheated areas.

In Fig. 4 ist der Anschlussendenbereich eines bekannten Rohrheizkörpers wiedergegeben. Dieser Rohrheizkörper weist eine Heizleiterwendel 22' auf, die in einem Mantelrohr 10' in einem elektrisch isolierenden Material 20' eingebettet ist. Über einen Anschlussbolzen 24' ist die Heizleiterwendel 22' auf dieser Seite mit einer Stromquelle verbunden. Um zu vermeiden, dass die einzelnen Wendel der Heizleiterwendel 22' im Bereich der Abkröpfung bzw. Krümmung 18' eine undefinierte Lage einnehmen, ist der Anschlussbolzen über den Krümmungsbereich des Mantelrohres 10' hinaus weiter in das Innere des Rohrheizkörpers geführt und die Heizleiterwendel 22' erst dort mit dem Anschlussbolzen 24' verbunden.In Fig. 4, the terminal end portion of a known tubular heater is shown. This tubular heater has a Heizleiterwendel 22 ', which is embedded in a jacket tube 10' in an electrically insulating material 20 '. Via a connecting bolt 24 ', the Heizleiterwendel 22' is connected on this side with a power source. In order to avoid that the individual filament of Heizleiterwendel 22 'take an undefined position in the region of the bend or bend 18', the connecting bolt is guided beyond the curvature region of the jacket tube 10 'further into the interior of the tubular heater and the Heizleiterwendel 22' only there connected to the connecting bolt 24 '.

Hierdurch wird aber die Heizleistung weiter verringert, da erst im Bereich der Heizleiterwendel 22' eine entsprechende Heizleistung vorhanden ist. Außerdem ist der Durchmesser der Heizleiterwendel 22' dem Durchmesser des Anschlussbolzens 24' angepasst. Da der Durchmesser des Bolzens 24' im Verhältnis zum Innendurchmesser des Mantelrohres 10' gering ist, kann bei gegebenen Manteloberdurchmesser auch nur eine geringe Heizleistung erzielt werden.As a result, however, the heating power is further reduced, since only in the region of the heating conductor 22 'a corresponding heating power is available. In addition, the diameter of the Heizleiterwendel 22 'is adapted to the diameter of the connecting bolt 24'. Since the diameter of the bolt 24 'in relation to the inner diameter of the jacket tube 10' is low, even a small heating power can be achieved with given upper shell diameter.

Es ist Aufgabe der vorliegenden Erfindung, einen Rohrheizkörper bzw. eine Heizleiterwendel der eingangs genannten Art bereitzustellen, die trotz einer hohen Heizleistung eine optimale Nutzung der Rohrheizkörperlänge erlauben.It is an object of the present invention to provide a tubular heater or a Heizleiterwendel of the type mentioned that allow optimal utilization of the tubular heater despite a high heat output.

Die vorstehende Aufgabe wird hinsichtlich des Rohrheizkörpers durch die Merkmale des Anspruchs 1 gelöst. In den sich daran anschließenden Ansprüchen 2 bis 9 finden sich vorteilhafte Ausgestaltungen hierzu.The above object is achieved with respect to the tubular heater by the features of claim 1. In the subsequent claims 2 to 9 are advantageous embodiments of this.

Durch die Zunahme des Durchmesser der Heizleiterwendel an wenigstens einem Anschlussendenbereich in Richtung zu dem Arbeitsbereich der Heizleiterwendel besteht die Möglichkeit, in dem kritischen Anschlussbereich die Heizleistung zu verringern, ohne dass hierdurch die nutzbare Länge des Rohrheizkörpers verringert wird. Die Heizleiterwendel kann also von dem Arbeitsbereich, in dem sie einen großen Durchmesser aufweist, auf einen für den Anschlussbereich günstigen Durchmesser verringert werden. Hierdurch erhält die Heizleiterwendel zumindest in einem Anschlussendenbereich eine wenigstens annähernd konische Ausgestaltung.By increasing the diameter of the Heizleiterwendel at least one terminal end region in the direction of the working range of Heizleiterwendel there is the possibility to reduce the heating power in the critical connection area, without thereby reducing the usable length of the tubular heater is reduced. The Heizleiterwendel can thus be reduced from the working area in which it has a large diameter to a favorable diameter for the connection area. This gives the Heizleiterwendel at least in a terminal end region an at least approximately conical configuration.

Grundsätzlich kann die Zunahme im Durchmesser der Heizleiterwendel, beginnend von dem freien Ende der Heizleiterwendel, in Richtung des Arbeitsbereichs zumindest abschnittsweise stetig erfolgen. Ebenso besteht die Möglichkeit, dass die Durchmesserzunahme der Heizleiterwendel zumindest abschnittsweise sprunghaft erfolgt. So kann beispielsweise vorgesehen sein, dass die Heizleiterwendel, beginnend von deren freien Ende, zunächst einen konstanten Durchmesser aufweist, sich anschließend deren Durchmesser stetig oder sprunghaft in Richtung des Arbeitsbereichs vergrößert, um anschließend in einen konstanten Durchmesser, der sich über den gesamten Arbeitsbereich erstreckt, überzugehen. Die sprunghafte Erhöhung des Durchmessers im Anschlussendenbereich der Heizleiterwendel kann dadurch erfolgen, dass ein oder mehrere stufenartige Vergrößerungen des Durchmessers der Heizleiterwendel vorhanden sind.In principle, the increase in the diameter of the heating conductor spiral, starting from the free end of the heating conductor spiral, can take place at least in sections in the direction of the working region, at least in sections. There is also the possibility that the increase in diameter of the Heizleiterwendel takes place at least partially leaps and bounds. Thus, for example, be provided that the Heizleiterwendel, starting from the free end, initially has a constant diameter, then the diameter increases steadily or suddenly in the direction of the work area, then in a constant Diameter, which extends over the entire work area to pass. The sudden increase in the diameter in the connection end region of the heating conductor spiral can be effected by providing one or more step-like enlargements of the diameter of the heating conductor spiral.

Neben der Durchmesservergrößerung der Heizleiterwendel im Anschlussendenbereich kann weiterhin vorgesehen sein, dass die Wendelsteigung der Heizleiterwendel in diesem Bereich konstant ist. Ebenso besteht die Möglichkeit, dass die Wendelsteigung der Heizleiterwendel im Bereich wenigstens eines Anschlussendenbereichs zumindest abschnittsweise veränderlich ist. So kann wiederum die Steigung der Heizleiterwendel, beginnend von deren freien Ende, zunächst konstant und sehr gering gewählt werden, anschließend bei gleichzeitiger vorzugsweise kontinuierlicher Zunahme im Durchmesser einen verhältnismäßig großen Steigungswert aufweisen und im Arbeitsbereich der Heizleiterwendel bei einem konstanten Durchmesser einen ebenfalls konstanten Steigungswert besitzen.In addition to the increase in diameter of the Heizleiterwendel in the connection end region can also be provided that the helical pitch of Heizleiterwendel is constant in this area. There is also the possibility that the spiral pitch of the heating conductor coil in the region of at least one connection end region is at least partially variable. Thus, in turn, the slope of the Heizleiterwendel, starting from the free end, first constant and very low, then with a preferably continuous increase in diameter have a relatively large slope value and in the working range of Heizleiterwendel at a constant diameter also have a constant slope value.

Wie bereits vorstehend in Zusammenhang mit dem Stand der Technik dargelegt worden ist, kann es notwendig sein, den Rohrheizkörper im Bereich eines oder beider Anschlussenden abzukröpfen, um eine Kontaktierung des Anschlussendes des Rohrheizkörpers mit einer Stromquelle zu erleichtern. Durch die erfindungsgemäße Ausgestaltung eins Rohrheizkörpers mit einer Heizleiterwendel, deren Durchmesser im Anschlussendenbereich in Richtung des Arbeitsbereiches zunimmt, besteht nunmehr die Möglichkeit, auch die Heizleiterwendel im Anschlussendenbereich mit mindestens einer Krümmung in ihrer Längsachse zu versehen.As has already been stated above in connection with the prior art, it may be necessary to abut the tubular heater in the region of one or both terminal ends, in order to facilitate a contacting of the terminal end of the tubular heater with a power source. The inventive design of a tubular heater with a Heizleiterwendel whose diameter increases in the connection end region in the direction of the work area, it is now possible to provide the Heizleiterwendel in the connection end region with at least one curvature in its longitudinal axis.

Eine besonders einfache Herstellung der Heizleiterwendel bzw. des Rohrheizkörpers wird dadurch erreicht, dass beide Anschlussendenbereiche der Heizleiterwendel gleich ausgestaltet sind.A particularly simple production of Heizleiterwendel or the tubular heater is achieved in that both terminal end portions of the Heizleiterwendel are configured the same.

Als Anschlusselement können ganz unterschiedliche Bauteile verwendet werden. Ein besonders günstiges Anschlusselement wird durch einen Anschlussbolzen aus einem elektrisch gut leitendem Material gebildet, wobei der Anschlussbolzen in das Innere der Heizleiterwendel einschiebbar ist und dessen Außendurchmesser zumindest im Bereich des Anschlussendes der Heizleiterwendel dem Innendurchmesser der Heizleiterwendel in diesem Bereich entspricht. Hierbei ist es besonders vorteilhaft, wenn der Durchmesser der Heizleiterwendel im Bereich des Anschlusselements konstant ist.As a connection element very different components can be used. A particularly favorable connecting element is provided by a connecting bolt formed from a highly electrically conductive material, wherein the terminal bolt is inserted into the interior of the Heizleiterwendel and whose outer diameter corresponds at least in the region of the terminal end of the Heizleiterwendel the inner diameter of the Heizleiterwendel in this area. In this case, it is particularly advantageous if the diameter of the heating conductor coil in the region of the connection element is constant.

Hinsichtlich der Heizleiterwendel wird die vorstehende Aufgabe durch die Merkmale des Anspruchs 10 gelöst. In den sich daran anschließenden Ansprüchen 11 bis 16 finden sich vorteilhafte Ausgestaltungen hierzu. Für die Heizleiterwendel gelten die gleichen Vorteile, wie sie im Zusammenhang mit dem Rohrheizkörper bereits vorstehend diskutiert worden sind.With regard to the Heizleiterwendel the above object is achieved by the features of claim 10. In the subsequent claims 11 to 16 are advantageous embodiments of this. For the Heizleiterwendel the same advantages apply, as they have been discussed in connection with the tubular heater already above.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Rohrheizkörpers bzw. der erfindungsgemäßen Heizleiterwendel sowie Ausführungsbeispiele hierzu werden nachstehend im Zusammenhang mit den angefügten Zeichnungsfiguren erläutert. Die in Verbindung mit der Beschreibung der Ausführungsbeispiele verwendeten Begriffe "links", "rechts", "unten" und "oben" beziehen sich auf die beigefügten Zeichnungsfiguren mit normal lesbaren Bezugszeichen und Figurenbezeichnungen. Hierbei ist:

Fig. 1
eine perspektivische Ansicht eines erfindungsgemäßen Rohrheizkörpers;
Fig. 2
eine in einem zu Fig. 1 vergrößerten Maßstab dargestellte, schematische Teilschnittansicht eines Anschlussendes des in Fig. 1 gezeigten Rohrheizkörpers;
Fig. 3
eine Teilseitenansicht einer erfindungsgemäßen Heizwendel; und
Fig. 4
eine zu Fig. 2 ähnliche Teilschnittansicht eines Anschlussendes eines bekannten Rohrheizkörpers.
Further advantageous embodiments of the tubular heater according to the invention or the Heizleiterwendel invention and embodiments thereof are explained below in connection with the attached drawing figures. The terms "left,""right,""bottom," and "above" used in connection with the description of the embodiments refer to the accompanying drawing figures with normally readable numerals and figure names. Here is:
Fig. 1
a perspective view of a tubular heater according to the invention;
Fig. 2
a schematic partial sectional view, shown in a scale enlarged to FIG. 1, of a connection end of the tubular heater shown in FIG. 1;
Fig. 3
a partial side view of a heating coil according to the invention; and
Fig. 4
a similar to Fig. 2 partial sectional view of a connection end of a known tubular heater.

In Fig. 1 ist ein erfindungsgemäßer elektrischer Rohrheizkörper R schematisch wiedergegeben. Dieser weist zunächst ein Mantelrohr 10 aus einem gut wärmeleitenden Material, wie Aluminium oder korrosionsbeständiger Stahl, auf. Das Mantelrohr 10, und damit der Rohrheizkörper R, kann in eine für die jeweilige Anwendung günstige Form gebracht werden. Im vorliegenden Fall ist das Mantelrohr 10 zu einem offenen Kreisring gebogen. Das Mantelrohr 10 kann unterschiedliche Querschnittsprofile aufweisen. Wie aus Fig. 1 hervorgeht, besitzt das Mantelrohr 10 hier einen im Wesentlichen quadratischen Querschnitt, wobei die Ecken des Quadrates abgeflacht sind.In Fig. 1, an inventive electric tubular heater R is shown schematically. This first comprises a jacket tube 10 made of a good heat-conducting material, such as aluminum or corrosion-resistant steel on. The jacket tube 10, and thus the tubular heater R, can be brought into a favorable shape for the particular application. In the present case, the jacket tube 10 is bent into an open circular ring. The jacket tube 10 may have different cross-sectional profiles. As is apparent from Fig. 1, the jacket tube 10 here has a substantially square cross section, wherein the corners of the square are flattened.

Der Rohrheizkörper R besitzt zwei Anschlussendenbereiche 12, 14, über die der Rohrheizkörper R mit einer nicht weiter dargestellten Stromquelle verbindbar ist. Zwischen den beiden Anschlussendenbereichen 12, 14 erstreckt sich ein Hauptwärmeabgabebereich 16 des Rohrheizkörpers R. Im Bereich der beiden Anschlussenden 12, 14 ist der Rohrheizkörper R jeweils mit einer Abkröpfung 18 ausgebildet. Hierdurch lassen sich die Anschlussendenbereiche 12, 14 aus der Ebene des Hauptwärmeabgabebereichs 16 des Rohrheizkörpers R nach oben herausführen, wodurch eine Kontaktierung mit der Stromquelle erleichtert wird.The tubular heater R has two terminal end portions 12, 14, via which the tubular heater R is connectable to a power source, not shown. Between the two connection end regions 12, 14 there extends a main heat emission region 16 of the tubular heater R. In the region of the two connection ends 12, 14, the tubular heater R is in each case formed with an offset 18. As a result, the connection end regions 12, 14 can be led out of the plane of the main heat emission region 16 of the tubular heater R upwards, thereby facilitating contact with the current source.

Aus Fig. 2 ist entnehmbar, dass in dem Mantelrohr 10 ein elektrisch isolierendes, aber wärmeleitendes Material 20, wie Magnesiumoxid eingefüllt ist, das gegebenenfalls durch einen Walz- und/oder Pressvorgang verdichtet sein kann. Das Isoliermaterial 20 umschließt eine Heizleiterwendel 22, die in Fig. 2 schematisch und in Fig. 3 im Detail dargestellt ist.From Fig. 2 it can be seen that in the jacket tube 10, an electrically insulating, but thermally conductive material 20, such as magnesium oxide is filled, which may optionally be compressed by a rolling and / or pressing. The insulating material 20 encloses a Heizleiterwendel 22, which is shown in Fig. 2 schematically and in Fig. 3 in detail.

Wie aus Fig. 3 hervorgeht, besitzt die gewickelte Heizleiterwendel 22 einen Anschlussbereich 22a und einen Arbeitsbereich 22b, der zumindest annährend dem bereits vorstehend erwähnten Hauptwärmeabgabebereich 16 des Rohrheizkörpers R entspricht. In ihrem Anschlussbereich 22a weist die Heizwendel 22, betrachtet von ihrem freien Ende 22c aus, einen ersten Abschnitt 22d mit konstantem Durchmesser auf. Daran schließt sich, noch immer innerhalb des Anschlussbereichs 22a, ein zweiter Abschnitt 22e an, in dem der Durchmesser der Heizwendel 22 gleichmäßig von dem Durchmesser im ersten Abschnitt 22d auf einen Durchmesser zunimmt, der sich dann konstant im Arbeitsbereich 22b fortsetzt. Weiterhin weist die Heizwendel 22 in dem ersten Abschnitt 22d, in dem ihr Durchmesser konstant ist, eine Steigung auf, die kleiner ist als die Steigung in dem zweiten Abschnitt 22e des Anschlussbereichs 22a und des Arbeitsbereichs 22d. Es ist noch anzumerken, dass die Steigung der Heizwendel 22 im zweiten Abschnitt 22e des Anschlussbereichs 22a von der des Arbeitsbereichs verschieden sein kann. Weiterhin ist anzumerken, dass die Heizwendel 22 auch in ihrem Anschlussbereich 22a Wärme abgibt, jedoch ist die Wärmeabgabe in diesem Bereich im Vergleich zu dem Arbeitsbereich 22b der Heizwendel 22 verringert. Schließlich ist noch zu bemerken, dass die Heizwendel 22 an ihrem anderen Ende ebenso ausgestaltet sein kann, wie es vorstehend im Zusammenhang mit dem in Fig. 2 gezeigten Ende geschildert worden ist.As is apparent from Fig. 3, the wound Heizleiterwendel 22 has a connection portion 22a and a working area 22b, which at least approximately corresponds to the already mentioned above main heat output portion 16 of the tubular heater R. In its connection region 22a, the heating coil 22, viewed from its free end 22c, has a first portion 22d of constant diameter. This is followed, still within the connection area 22a, by a second section 22e, in which the diameter of the heating coil 22 is uniformly from the diameter in the first section 22d to a Diameter increases, which then continues constantly in the work area 22b. Further, in the first portion 22d, in which its diameter is constant, the heating coil 22 has a pitch smaller than the pitch in the second portion 22e of the terminal portion 22a and the working portion 22d. It should also be noted that the pitch of the heating coil 22 in the second portion 22e of the terminal portion 22a may be different from that of the working portion. Furthermore, it should be noted that the heating coil 22 also gives off heat in its connection region 22a, but the heat emission in this region is reduced in comparison with the working region 22b of the heating coil 22. Finally, it should be noted that the heating coil 22 may be configured at its other end as well, as has been described above in connection with the end shown in Fig. 2.

Wie weiterhin aus Fig. 2 hervorgeht, ist die Heizwendel 22 über einen Anschlussbolzen 24 mit der Außenseite des Rohrheizkörpers R verbunden. Der Anschlussbolzen 24 ist aus einem gut stromleitenden Material hergestellt und besitzt einen im Wesentlichen zylindrischen Querschnitt mit konstantem Durchmesser. Der Anschlussbolzen 24 ist zur Lagerfixierung durch eine Isolierperle 26 aus Keramik oder einem vergleichbaren Material hindurchgeführt. Die Verbindung zwischen der Heizwendel 22 im Bereich des ersten Abschnitts 22d des Anschlussbereichs 22a und dem Anschlussbolzen 24 erfolgt durch Schweißen.As further apparent from Fig. 2, the heating coil 22 is connected via a connecting bolt 24 with the outside of the tubular heater R. The connecting bolt 24 is made of a good electrically conductive material and has a substantially cylindrical cross section with a constant diameter. The connecting bolt 24 is guided for bearing fixation by an insulating bead 26 made of ceramic or a similar material. The connection between the heating coil 22 in the region of the first portion 22d of the connection region 22a and the connection bolt 24 is effected by welding.

Wie schließlich aus Fig. 2 auch hervorgeht, ist die Heizwendel 22 im Anschlussendenbereich 12 des Rohrheizkörpers R entlang ihrer Längsachse L gekrümmt und folgt damit der Abkröpfung 18 des Rohrheizkörpers R.Finally, as also apparent from FIG. 2, the heating coil 22 is curved in the connection end region 12 of the tubular heater R along its longitudinal axis L and thus follows the bend 18 of the tubular heater R.

Claims (16)

Rohrheizkörper (R) zum Erwärmen fließfähiger Medien, insbesondere für Haushaltsgeräte, mit einem Mantelrohr (10), in dessen Innerem mindestens eine in einem elektrischen Isolationsmaterial (20) eingebettete Heizleiterwendel (22) aus einem elektrischen Widerstands-Heizleiterdraht angeordnet ist, wobei die Heizleiterwendel (22) einen ersten sowie einen zweiten Anschlussbereich (22a), mittels der die Heizleiterwendel (22) über wenigstens jeweils ein Anschlusselement (24) mit einer Stromquelle verbunden ist, und mindestens einen Arbeitsbereich (22b) aufweist, der sich zwischen den beiden Anschlussbereichen (22a) der Heizleiterwendel (22) erstreckt, wobei
der Durchmesser der Heizleiterwendel (22) an wenigstens einem Anschlussbereich (22a) in Richtung zu dem Arbeitsbereich (22b) zunimmt,
dadurch gekennzeichnet, dass die Heizleiterwendel (22) im Anschlussbereich (22a) mindestens eine Krümmung in ihrer Längsachse aufweistTubular heating element (R) for heating flowable media, in particular for household appliances, having a jacket tube (10) in the interior of which at least one heating conductor coil (22) of an electrical resistance heating conductor wire embedded in an electrical insulation material (20) is arranged, wherein the heating conductor coil ( 22) comprises a first and a second connection region (22a), by means of which the heating conductor coil (22) is connected to a current source via at least one connection element (24) and has at least one working region (22b) which extends between the two connection regions (22a ) of the Heizleiterwendel (22), wherein
the diameter of the heating conductor coil (22) increases at at least one connection region (22a) in the direction of the working region (22b),
characterized in that the Heizleiterwendel (22) in the connection region (22a) has at least one curvature in its longitudinal axis Rohrheizkörper (R) nach Anspruch 1,
dadurch gekennzeichnet, dass die Durchmesserzunahme der Heizleiterwendel (22) zumindest abschnittsweise stetig erfolgt.Tubular heater (R) according to claim 1,
characterized in that the diameter increase of the Heizleiterwendel (22) takes place at least in sections continuously. Rohrheizkörper nach Anspruch 1,
dadurch gekennzeichnet, dass die Durchmesserzunahme der Heizleiterwendel (22) zumindest abschnittsweise sprunghaft erfolgt.Tubular heater according to claim 1,
characterized in that the diameter increase of the Heizleiterwendel (22) takes place at least partially jump. Rohrheizkörper nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Durchmesser der Heizleiterwendel (22) im Arbeitsbereich (22b) zumindest annährend konstant ist.Tubular heater according to one of claims 1 to 3,
characterized in that the diameter of the Heizleiterwendel (22) in the working area (22b) is at least approximately constant. Rohrheizkörper nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass die Wendelsteigung der Heizleiterwendel (22) im Bereich wenigstens eines Anschlussbereichs (22a) konstant ist.Tubular heater according to one of claims 1 to 4,
characterized in that the spiral pitch of the Heizleiterwendel (22) in the region of at least one connection region (22a) is constant. Rohrheizkörper nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass die Wendelsteigung der Heizleiterwendel (22) im Bereich wenigstens eines Anschlussbereichs (22a) zumindest abschnittsweise veränderlich ist.Tubular heater according to one of claims 1 to 4,
characterized in that the spiral pitch of the Heizleiterwendel (22) in the region of at least one connection region (22a) is at least partially variable. Rohrheizkörper nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass beide Anschlussendenbereiche (12, 14) gleich ausgestaltet sind.Tubular heater according to one of claims 1 to 6,
characterized in that both terminal end regions (12, 14) are designed the same. Rohrheizkörper nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass das Anschlusselement aus einem Anschlussbolzen (24) gebildet ist, der in das Innere der Heizleiterwendel (22) einschiebbar ist und dessen Außendurchmesser zumindest im Bereich des Anschlussendes (22a) der Heizleiterwendel (22) dem Innendurchmesser der Heizleiterwendel (22) in diesem Bereich entspricht.Tubular heater according to one of claims 1 to 7,
characterized in that the connecting element is formed from a connecting bolt (24) which is insertable into the interior of the Heizleiterwendel (22) and whose outer diameter at least in the region of the terminal end (22a) of the Heizleiterwendel (22) the inner diameter of the Heizleiterwendel (22) corresponds to this area. Rohrheizkörper nach Anspruch 8,
dadurch gekennzeichnet, dass der Durchmesser der Heizleiterwendel (22) im Bereich des Anschlusselements (24) konstant ist.Tubular heater according to claim 8,
characterized in that the diameter of the Heizleiterwendel (22) in the region of the connecting element (24) is constant. Heizleiterwendel für einen Rohrheizkörper (R) zum Erwärmen fließfähiger Medien, insbesondere für Haushaltsgeräte, die aus einem elektrischen Widerstands-Heizleiterdraht gewickelt ist und die einen ersten sowie einen zweiten Anschlussbereich (22a), mittels der sie über wenigstens jeweils ein Anschlusselement (24) mit einer Stromquelle verbindbar ist, und mindestens einen Arbeitsbereich (22b) aufweist, der sich zwischen den beiden Anschlussbereichen (22a) der Heizleiterwendel (22) erstreckt, wobei
der Durchmesser der Wendel (22) an wenigstens einem Anschlussendenbereich (12, 14) in Richtung zu dem Arbeitsbereich (22b) zunimmt,
dadurch gekennzeichnet, dass die Wendel (22) im Anschlussbereich (22a) mindestens eine Krümmung in ihrer Längsachse aufweist.Heating conductor coil for a tubular heater (R) for heating flowable media, in particular for household appliances, which is wound from an electrical resistance heating conductor and the first and a second terminal portion (22a), by means of at least one connecting element (24) with a Power source is connectable, and at least one working area (22 b) which extends between the two terminal portions (22 a) of the Heizleiterwendel (22), wherein
the diameter of the helix (22) increases at at least one terminal end region (12, 14) towards the working region (22b),
characterized in that the helix (22) in the connection region (22a) has at least one curvature in its longitudinal axis. Heizleiterwendel nach Anspruch 10,
dadurch gekennzeichnet, dass die Durchmesserzunahme der Wendel (22) zumindest abschnittsweise stetig erfolgt.Heating conductor coil according to claim 10,
characterized in that the diameter increase of the helix (22) takes place at least in sections continuously. Heizleiterwendel nach Anspruch 11
dadurch gekennzeichnet, dass die Durchmesserzunahme der Wendel (22) zumindest abschnittsweise sprunghaft erfolgt.Heating conductor coil according to claim 11
characterized in that the diameter increase of the helix (22) takes place at least in sections abruptly. Heizleiterwendel nach einem der Ansprüche 11 bis 12,
dadurch gekennzeichnet, dass der Durchmesser der Wendel (22) im Arbeitsbereich (22b) zumindest annährend konstant ist.Heating conductor coil according to one of claims 11 to 12,
characterized in that the diameter of the helix (22) in the working area (22b) is at least approximately constant. Heizleiterwendel nach einem der Ansprüche 11 bis 13,
dadurch gekennzeichnet, dass die Steigung der Wendel (22) im Bereich wenigstens eines Anschlussbereichs (22a) konstant ist.Heating conductor coil according to one of claims 11 to 13,
characterized in that the pitch of the helix (22) in the region of at least one connection region (22a) is constant. Heizleiterwendel nach einem der Ansprüche 11 bis 14,
dadurch gekennzeichnet, dass die Steigung der Wendel (22) im Bereich wenigstens eines Anschlussbereichs (22a) zumindest abschnittsweise veränderlich ist.Heating conductor coil according to one of claims 11 to 14,
characterized in that the pitch of the helix (22) in the region of at least one connection region (22a) is at least partially variable. Heizleiterwendel nach einem der Ansprüche 11 bis 15,
dadurch gekennzeichnet, dass beide Anschlussbereiche (22a) gleich ausgestaltet sind.Heating conductor coil according to one of claims 11 to 15,
characterized in that both connection regions (22a) are designed the same.
EP06007617A 2005-04-25 2006-04-11 Tubular heating element with a conical heating spiral conductor Active EP1718115B1 (en)

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DE102005019211A DE102005019211B3 (en) 2005-04-25 2005-04-25 Tubular radiator with conical heating coil

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EP (1) EP1718115B1 (en)
CN (1) CN1856192B (en)
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ATE443423T1 (en) 2009-10-15
US20060249508A1 (en) 2006-11-09
DE102005019211B3 (en) 2006-11-30
DE502006004833D1 (en) 2009-10-29
US7538301B2 (en) 2009-05-26
CN1856192A (en) 2006-11-01
ES2333147T3 (en) 2010-02-17
CN1856192B (en) 2010-12-01
PL1718115T3 (en) 2010-02-26
EP1718115B1 (en) 2009-09-16

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