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EP0333906B1 - PTC heating resistor - Google Patents

PTC heating resistor Download PDF

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Publication number
EP0333906B1
EP0333906B1 EP19880104821 EP88104821A EP0333906B1 EP 0333906 B1 EP0333906 B1 EP 0333906B1 EP 19880104821 EP19880104821 EP 19880104821 EP 88104821 A EP88104821 A EP 88104821A EP 0333906 B1 EP0333906 B1 EP 0333906B1
Authority
EP
European Patent Office
Prior art keywords
ptc
heating element
cover plate
carrier profile
profile body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19880104821
Other languages
German (de)
French (fr)
Other versions
EP0333906A1 (en
Inventor
Franz Bohlender
Norbert Buchlaub
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DBK David and Baader GmbH
Original Assignee
DBK David and Baader GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DBK David and Baader GmbH filed Critical DBK David and Baader GmbH
Priority to EP19880104821 priority Critical patent/EP0333906B1/en
Priority to DE88104821T priority patent/DE3885087D1/en
Publication of EP0333906A1 publication Critical patent/EP0333906A1/en
Application granted granted Critical
Publication of EP0333906B1 publication Critical patent/EP0333906B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic

Definitions

  • the invention relates to a PTC thermistor, consisting of an elongated support profile body made of thermally conductive material with at least one contact surface and at least one PTC heating element lying flat on one side in a thermally conductive connection, comprising an upper and a lower electrode plate and at least one PTC arranged in between. Resistance element and a cover body with a surface section lying flat on the other side of the PTC heating element.
  • a radiator of this type is known from DE-OS 30 42 420.
  • PTC radiators of the aforementioned type generally contain several flat heating elements which, if necessary, from an insulating plate with openings provided therein for receiving the heating elements, are kept at a mutual distance and are clamped between two electrode plates which supply the heating elements with current.
  • the heat developed in the PTC heating elements is emitted to the outside from their flat sides, which requires good heat conduction between the PTC heating element and the carrier profile element.
  • the object on which the invention is based is to propose a PTC thermistor of the type mentioned at the outset, which in a simple manner enables good heat conduction between the PTC heater and the carrier profile body.
  • the PTC thermistor it is possible in a simple manner to place the PTC heating element on the support surface of the support profile body, the right and left of the PTC heating element arranged holding rails form the lateral boundary of the PTC heating element.
  • the cover plate is pushed into the holding rails via this PTC heating element, the edge strips of this cover plate being clamped in the holding rails and the middle surface section of the cover plate pressing on the PTC heating element.
  • the holding rails of the support profile body are U-shaped in cross section in their end regions, the beads of the cover plate being arranged in the inserted state between the U-legs of the holding rails and the middle surface section of the cover plate pressing on the PTC heating element.
  • the cover plate is inserted between the U-legs of the holding rails, the beads being inserted between the U-legs and in this way ensuring the bracing of the cover plate with the carrier profile body.
  • a spring plate is additionally provided as a tensioning device for mutually bracing the carrier profile body with the cover plate PTC heating element facing away from the cover plate is inserted into the holding rails of the support profile body.
  • the middle surface section of this spring plate is bulged and presses against the middle surface section of the cover plate in the tensioned state.
  • the spring plate is arranged above the cover plate and, like the cover plate, is clamped to the support profile body via the holding rails. This ensures additional bracing in a particularly simple manner, which ensures the necessary additional bracing at higher temperatures, for example.
  • the carrier profile body advantageously has a channel on its side facing away from the PTC heating element, which has a cross section that is open on the side facing away from the PTC heating element.
  • This particularly preferred embodiment enables good heat transfer to a tubular body, the surface of which is arranged in the interior of the channel.
  • the subject matter of the present invention provides a PTC heating element which makes it possible to dissipate the heat developed on both sides by the PTC heating element. This heat can be emitted via the carrier profile body in a manner known per se.
  • the items of the radiator can be joined together in a very simple manner, without the need for any bending processes or casting, the individual components only need to be superimposed or pushed in a suitable manner and are then braced against one another.
  • Another advantage of the object according to the invention is that the PTC heating element can be manufactured in automated production systems and supports itself.
  • the PTC heater consists of a support profile body 1, a PTC heating element from in the present case four PTC resistance elements 2, a position plate 3, which secures the PTC resistance elements 2 in their position, and upper and lower Electrode plates 4 and 5 with connecting conductors 6, an insulating film 7 and a cover plate 8.
  • the carrier profile body 1 and the cover plate 8 consist of a highly thermally conductive material, for example made of aluminum or copper and the PTC heating element is electrically insulated from it by the insulation 7 made of a highly thermally conductive, electrically insulating material.
  • the carrier profile body 1 has the contact surface 10 for receiving the PTC heating element.
  • the holding rails 11 and 12 are arranged, which laterally limit the PTC heating element when it is placed on the supporting surface 10 between these holding rails 11 and 12.
  • the PTC heating element has four PTC resistance elements 2.
  • the position plate 3 has four openings 16 which are intended to accommodate the four PTC resistance elements 2 and are correspondingly adapted to their size.
  • the position plate 3 consists of an insulating material and has notches 17 on both sides of the edges.
  • the electrode plates 4 and 5 serve as contact plates and have lugs 18 and 19 and cutouts 20 and 21, which are angled downwards or upwards at their longitudinal edges, the lugs and the cutouts on the electrode plates being aligned with respect to one another in such a way that that after sandwiching the from the electrode plates, the position plate and the PTC resistance elements consisting of the PTC resistance elements and the bending of the lugs 18 and 19 (tabs), the two electrode plates do not touch one another.
  • This structure of the PTC heating element is already known from DE-OS 30 42 420.
  • the PTC heating element shown has the advantage of being able to be produced fully automatically, since it carries itself after assembly and can therefore be produced in such automated production systems.
  • the heating element After the heating element has been assembled as described, it is wrapped by the insulating film 7 and in this state lies on the contact surface 10 of the carrier profile body 1.
  • the insulating film 7 electrically insulates the heating element from the carrier profile body 1, but ensures good heat transfer. It is therefore made of a highly thermally conductive material.
  • the heating element just described is placed on the support surface 10 of the carrier profile body 1. It is now laterally delimited on both sides by the holding rails 11 and 12, the end regions 13 and 14, which are U-shaped in cross section, projecting beyond the heating element.
  • the cover plate 8 is now inserted between the U-legs of the holding rails 11 and 12, the middle surface section 22 of the cover plate 8 pressing on the PTC heating element.
  • a longitudinal bead 25 or 26 is formed on the edge strips 23 or 24 of the cover plate 8. If the edge strips 23 and 24 of the cover plate 8 are pushed into the holding rails 11 and 12 of the carrier profile body 1, the beads 25 and 26 are arranged between the U-legs of the end regions 13 and 14 of the holding rails 11 and 12 (see Figure 2).
  • the heat given off by the heating element via the electrode plates 4 and 5 and the insulating film 7 is absorbed, on the one hand, directly by the carrier profile body 1 and, on the other hand, by the cover plate 8, from which it is also derived into the carrier profile body 1.
  • FIG. 3 and Figure 4 show another embodiment of the present invention.
  • a spring plate 27 is provided in this embodiment, which is pushed over the cover plate 8.
  • the PTC heating element is omitted in FIG. 3.
  • FIG. 4 it can be seen that the connecting conductors 6, which lead to the PTC heating element, are arranged below the cover plate 8 and consequently the PTC heating element rests on the contact surface 10 of the carrier profile body 1 a.
  • the support profile body 1a shown in FIG. 3 and FIG. 4 is configured differently on the side facing away from the PTC heating element than the support profile body 1 shown in FIG. 1 and FIG. 2.
  • the holding rails 11 and 12 are designed analogously and that Cover plate 8 with its edge strips 23 and 24 also between the U-legs of the end regions 13 and 14 of the holding rails 11 or 12 are inserted.
  • the spring plate 27 is arranged above the cover plate 8, the central surface section 28 of which is bulged and presses on the central surface section 22 of the cover plate 8 in the inserted state. In the tensioned state shown in FIG. 4, this spring plate 27 brings about an even stronger tensioning of the cover body 8 with the carrier profile body 1a. As a result, the desired heat conduction from the PTC element to the cover plate and onto the carrier profile body is reinforced.
  • the shape of the spring plate 27 is substantially adapted to the surface of the cover plate 8 in the edge regions.
  • This spring plate acts as a prestressed steel spring and it is useful to use such a spring plate in addition to the bracing at higher temperatures.
  • the cover plate 8 usually consists of aluminum, the beads 25 and 26 being formed in the aluminum in a manner which is conventional per se.
  • the carrier profile body is usually designed as a standing profile.
  • the carrier profile body 1 a has a channel 29 on its side facing away from the PTC heating element, which has a cross section that on the PTC heating element opposite side is open.
  • the underside or the lower part of the carrier profile body can also have any other shape, depending on how the outline of the body to be heated is designed.
  • an insulating film can be dispensed with if the carrier profile body consists of an insulating material, for example a ceramic material.
  • the insulation can also be carried out by means of insulating plates, as is already known per se from the prior art.
  • the dimensions of the holding rails and the cover plate or the spring plate are matched to one another in such a way that a good fit is achieved so that sufficiently large thermal bridges are created.
  • a certain elasticity of the material of the carrier profile body can also contribute to this, which allows a slight spreading of the U-legs of the end regions 13 and 14 of the holding rails 11 and 12 due to a corresponding fit.

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  • Resistance Heating (AREA)

Description

Die Erfindung betrifft einen Kaltleiter-PTC-Heizkörper, bestehend aus einem länglichen Trägerprofilkörper aus wärmeleitfähigem Material mit wenigstens einer Auflagefläche und wenigstens einem auf dieser in wärmeleitender Verbindung einseitig flach aufliegenden PTC-Heizelement aus einer oberen und einer unteren Elektrodenplatte und wenigstens einem dazwischen angeordneten PTC-Widerstandselement und einem Deckkörper mit einem auf der anderen Seite des PTC-Heizelements flach aufliegenden Flächenabschnitts.The invention relates to a PTC thermistor, consisting of an elongated support profile body made of thermally conductive material with at least one contact surface and at least one PTC heating element lying flat on one side in a thermally conductive connection, comprising an upper and a lower electrode plate and at least one PTC arranged in between. Resistance element and a cover body with a surface section lying flat on the other side of the PTC heating element.

Ein Heizkörper dieser eingangs genannten Art ist aus der DE-OS 30 42 420 bekannt.A radiator of this type is known from DE-OS 30 42 420.

PTC-Heizkörper der vorgenannten Art enthalten in aller Regel mehrere flache Heizelemente, die, gegebenenfalls von einer Isolierplatte mit darin vorhandenen Durchbrüchen für die Aufnahme der Heizelemente, auf gegenseitigem Abstand gehalten und zwischen zwei Elektrodenplatten eingeklemmt sind, die den Heizelementen Strom zuführen. Die in den PTC-Heizelementen entwickelte Wärme wird von ihren Flachseiten nach außen abgegeben, wozu eine gute Wärmeleitung zwischen dem PTC-Heizkörper und dem Trägerprofilkörper erforderlich ist.PTC radiators of the aforementioned type generally contain several flat heating elements which, if necessary, from an insulating plate with openings provided therein for receiving the heating elements, are kept at a mutual distance and are clamped between two electrode plates which supply the heating elements with current. The heat developed in the PTC heating elements is emitted to the outside from their flat sides, which requires good heat conduction between the PTC heating element and the carrier profile element.

Zur Erzielung einer guten Wärmeabführung von einem PTC-Heizkörper ist es aus der DE-AS 20 02 254 bekannt, das die Wärme erzeugende PTC-Heizelement in einem Gehäuse mit Paraffin zu vergießen, so daß die Wärme allseitig von dem Heizelement abgeleitet wird. Auch aus der DE-OS 22 63 020 ist es bekannt, das PTC-Heizelement in einem es umgebenden Gehäuse mittels einer thermisch leitenden, elektrisch isolierenden Masse einzugießen.To achieve good heat dissipation from a PTC heating element, it is known from DE-AS 20 02 254 to shed the heat-generating PTC heating element in a housing with paraffin, so that the heat is dissipated from the heating element on all sides. From DE-OS 22 63 020 it is known to cast the PTC heating element in a surrounding housing by means of a thermally conductive, electrically insulating compound.

Aus der DE-PS 26 14 433 ist es bekannt, die Wärme von flachen PTC-Heizelementen, die innerhalb einer sie umgebenden Hülse angeordnet sind, mit Hilfe von federnden Blechen auf die Hülse zu übertragen, die jeweils einen auf den Heizelementen flach aufliegenden Schenkel und einen gebogenen, an der Hülsenwandung anliegenden Schenkel aufweisen. Auf diese Weise wird eine Wärmeableitung von beiden Seiten der Heizelemente in gleichem Umfang auf die Hülse erreicht.From DE-PS 26 14 433 it is known to transfer the heat from flat PTC heating elements, which are arranged within a sleeve surrounding them, with the aid of resilient sheets to the sleeve, each having a leg lying flat on the heating elements and have a curved leg abutting the sleeve wall. In this way, heat dissipation from both sides of the heating elements is achieved to the same extent on the sleeve.

Es gibt häufig Einsatzfälle, in denen Wärme einseitig auf einen Wärmeverbraucher zu übertragen ist. Ein solches Beispiel ist in der US-PS 40 91 267 dargestellt, in der ein elektrischer Wasserheizer beschrieben ist, bestehend aus einem Gefäß, das von außen mittels eines PTC-Heizkörpers beheizt wird. Dieser Heizkörper ist an einer Seitenwand des Behälters angebracht und enthält ein PTC-Heizelement, das innerhalb eines Gehäuses an der Gehäusewand anliegend angeordnet und in einer keramischen Filmmasse eingebettet ist. Aufgrund unterschiedlicher Wärmeableiteigenschaften zu beiden Seiten des Heizelements kann es bei dieser Anordnung dazu kommen, daß das Heizelement auf der einen Seite wärmer als auf der anderen Seite ist, daher seinen Widerstand entsprechend erhöht und keine optimale Wärmeentwicklung gewährleistet.There are often applications in which heat is to be transferred to a heat consumer on one side. Such an example is shown in US Pat. No. 4,091,267, in which an electric water heater is described, consisting of a vessel that is heated from the outside by means of a PTC heater. This heating element is attached to a side wall of the container and contains a PTC heating element which is arranged adjacent to the housing wall within a housing and is embedded in a ceramic film. Due to different heat dissipation properties on both sides of the heating element, this arrangement can result in the heating element being warmer on one side than on the other side, therefore increasing its resistance accordingly and not ensuring optimum heat development.

Die der Erfindung zugrunde liegende Aufgabe besteht darin, einen Kaltleiter-PTC-Heizkörper der eingangs genannten Art vorzuschlagen, der auf einfache Weise eine gute Wärmeleitung zwischen dem PTC-Heizkörper und dem Trägerprofilkörper ermöglicht.The object on which the invention is based is to propose a PTC thermistor of the type mentioned at the outset, which in a simple manner enables good heat conduction between the PTC heater and the carrier profile body.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß an dem Trägerprofilkörper beiderseits der Auflagefläche Halteschienen ausgebildet sind, die jeweils die Randstreifen des als Deckplatte ausgebildeten Deckkörpers engsitzend aufnehmen, wobei an diesen Randstreifen der Deckplatte jeweils mindestens eine längs verlaufende Sicke ausgebildet ist.This object is achieved in that on the support profile body on both sides of the support surface support rails are formed, each of which receives the edge strips of the cover body designed as a cover plate, wherein at least one longitudinal bead is formed on each of these edge strips of the cover plate.

Bei dem erfindungsgemäßen Kaltleiter-PTC-Heizkörper ist es auf einfache Weise möglich, das PTC-Heizelement auf die Auflagefläche des Trägerprofilkörpers aufzulegen, wobei die rechts und links von dem PTC-Heizelement angeordneten Halteschienen die seitliche Begrenzung des PTC-Heizelements bilden. Über dieses PTC-Heizelement wird die Deckplatte in die Halteschienen geschoben, wobei die Randstreifen dieser Deckplatte in den Halteschienen verspannt werden und der mittlere Flächenabschnitt der Deckplatte auf das PTC-Heizelement drückt. Auf diese Weise wird eine besonders gute Wärmeleitung von dem PTC-Heizelement über die Deckplatte bzw. den Trägerprofilkörper in die äußeren Bereiche des Trägerprofilkörpers gewährleistet, wodurch die gewünschte Wärmeleitung auf den Verbraucher möglich wird.In the PTC thermistor according to the invention, it is possible in a simple manner to place the PTC heating element on the support surface of the support profile body, the right and left of the PTC heating element arranged holding rails form the lateral boundary of the PTC heating element. The cover plate is pushed into the holding rails via this PTC heating element, the edge strips of this cover plate being clamped in the holding rails and the middle surface section of the cover plate pressing on the PTC heating element. In this way, particularly good heat conduction from the PTC heating element via the cover plate or the carrier profile body into the outer regions of the carrier profile body is ensured, as a result of which the desired heat conduction to the consumer is possible.

Gemäß einer besonders bevorzugten Ausführungsform sind die Halteschienen des Trägerprofilkörpers in ihren Endbereichen im Querschnitt U-förmig ausgebildet, wobei die Sicken der Deckplatte im eingeschobenen Zustand zwischen den U-Schenkeln der Halteschienen angeordnet sind und der mittlere Flächenabschnitt der Deckplatte auf das PTC-Heizelement drückt.According to a particularly preferred embodiment, the holding rails of the support profile body are U-shaped in cross section in their end regions, the beads of the cover plate being arranged in the inserted state between the U-legs of the holding rails and the middle surface section of the cover plate pressing on the PTC heating element.

Gemäß dieser besonders bevorzugten Ausführungsform wird die Deckplatte zwischen die U-Schenkel der Halteschienen eingeschoben, wobei die Sicken zwischen die U-Schenkel eingeführt werden und auf diese Weise die Verspannung der Deckplatte mit dem Trägerprofilkörper gewährleisten.According to this particularly preferred embodiment, the cover plate is inserted between the U-legs of the holding rails, the beads being inserted between the U-legs and in this way ensuring the bracing of the cover plate with the carrier profile body.

Gemäß einer weiteren besonders bevorzugten Ausführungsform ist zusätzlich als Spanneinrichtung zum gegenseitigen Verspannen des Trägerprofilkörpers mit der Deckplatte ein Federblech vorgesehen, das über die von dem PTC-Heizelement abgewandten Seite der Deckplatte in die Halteschienen des Trägerprofilkörpers eingeschoben ist. Der mittlere Flächenabschnitt dieses Federblechs ist ausgebaucht und drückt im verspannten Zustand gegen den mittleren Flächenabschnitt der Deckplatte. Bei dieser besonders bevorzugten Ausführungsform ist das Federblech über der Deckplatte angeordnet und ebenso wie die Deckplatte mit dem Trägerprofilkörper über die Halteschienen verspannt. Hierdurch wird auf besonders einfache Weise eine zusätzliche Verspannung gewährleistet, die beispielsweise bei höheren Temperaturen die notwendige zusätzliche Verspannung gewährleistet.According to a further particularly preferred embodiment, a spring plate is additionally provided as a tensioning device for mutually bracing the carrier profile body with the cover plate PTC heating element facing away from the cover plate is inserted into the holding rails of the support profile body. The middle surface section of this spring plate is bulged and presses against the middle surface section of the cover plate in the tensioned state. In this particularly preferred embodiment, the spring plate is arranged above the cover plate and, like the cover plate, is clamped to the support profile body via the holding rails. This ensures additional bracing in a particularly simple manner, which ensures the necessary additional bracing at higher temperatures, for example.

Vorteilhafterweise weist der Trägerprofilkörper auf seiner dem PTC-Heizelement abgewandten Seite einen Kanal auf, der einen Querschnitt hat, der auf der dem PTC-Heizelement abgewandten Seite offen ist. Diese besonders bevorzugte Ausführungsform ermöglicht eine gute Wärmeübertragung auf einen rohrförmgen Körper, dessen Oberfläche im Inneren des Kanals angeordnet wird.The carrier profile body advantageously has a channel on its side facing away from the PTC heating element, which has a cross section that is open on the side facing away from the PTC heating element. This particularly preferred embodiment enables good heat transfer to a tubular body, the surface of which is arranged in the interior of the channel.

Weitere besonders bevorzugte Ausführungsformen sind Gegenstand der weiteren Unteransprüche.Further particularly preferred embodiments are the subject of the further subclaims.

Durch den Gegenstand der vorliegenden Erfindung wird ein PTC-Heizkörper geschaffen, der es ermöglicht, die von dem PTC-Heizkörper beidseitig entwickelte Wärme abzuleiten. Diese Wärme kann über den Trägerprofilkörper auf an sich bekannte Weise abgegeben werden.The subject matter of the present invention provides a PTC heating element which makes it possible to dissipate the heat developed on both sides by the PTC heating element. This heat can be emitted via the carrier profile body in a manner known per se.

Es ist wesentlich für die Erfindung, daß die Einzelteile des Heizkörpers in sehr einfacher Weise zusammengefügt werden können, ohne daß es irgendwelcher Biegevorgänge oder eines Vergießens bedarf, die einzelnen Bauteile brauchen nur in geeigneter Weise übereinandergelegt bzw. geschoben werden und sind dann gegeneinander verspannt. Ein Vorteil des erfindungsgemäßen Gegenstandes besteht ferner darin, daß das PTC-Heizelement in automatisierten Fertigungsanlagen hergestellt werden kann und sich selbst trägt.It is essential for the invention that the items of the radiator can be joined together in a very simple manner, without the need for any bending processes or casting, the individual components only need to be superimposed or pushed in a suitable manner and are then braced against one another. Another advantage of the object according to the invention is that the PTC heating element can be manufactured in automated production systems and supports itself.

Die Erfindung wird nun anhand der folgenden Zeichnungen näher erläutert.The invention will now be explained in more detail with reference to the following drawings.

Es zeigen:

  • Figur 1 eine Explosionsdarstellung eines erfindungsgemäßen Kaltleiter-PTC-Heizkörpers,
  • Figur 2 den in Figur 1 dargestellten Kaltleiter-PTC-Heizkörper im zusammengebauten Zustand,
  • Figur 3 Explosionsdarstellung eines Kaltleiter-PTC-Heizkörpers gemäß einer anderen Ausführungsform der Erfindung, ohne PTC-Heizelement und
  • Figur 4 den in Figur 3 dargestellten Heizkörper im zusammengebauten Zustand einschließlich eines PTC-Heizelements.
Show it:
  • FIG. 1 shows an exploded view of a PTC thermistor according to the invention,
  • FIG. 2 shows the PTC thermistor shown in FIG. 1 in the assembled state,
  • Figure 3 is an exploded view of a PTC thermistor according to another embodiment of the invention, without a PTC heating element and
  • Figure 4 shows the radiator shown in Figure 3 in the assembled state including a PTC heating element.

Gemäß Figur 1 und Figur 2 besteht der PTC-Heizkörper aus einem Trägerprofilkörper 1, einem PTC-Heizelement aus im vorliegenden Falle vier PTC-Widerstandselementen 2, einer Postionsplatte 3, die die PTC-Wider standselemente 2 in ihrer Position sichert, und oberen und unteren Elektrodenplatten 4 und 5 mit Anschlußleitern 6, einer Isolierfolie 7 und einer Deckplatte 8.According to Figure 1 and Figure 2, the PTC heater consists of a support profile body 1, a PTC heating element from in the present case four PTC resistance elements 2, a position plate 3, which secures the PTC resistance elements 2 in their position, and upper and lower Electrode plates 4 and 5 with connecting conductors 6, an insulating film 7 and a cover plate 8.

Der Trägerprofilkörper 1 und die Deckplatte 8 bestehen aus einem gut wärmeleitfähigen Material, besipielsweise aus Aluminium oder Kupfer und das PTC-Heizelement ist von diesem durch die Isolierung 7 aus gut wärmeleitfähigem, elektrisch isolierendem Material elektrisch isoliert.The carrier profile body 1 and the cover plate 8 consist of a highly thermally conductive material, for example made of aluminum or copper and the PTC heating element is electrically insulated from it by the insulation 7 made of a highly thermally conductive, electrically insulating material.

Der Trägerprofilkörper 1 weist die Auflagefläche 10 zur Aufnahme des PTC-Heizelements auf. Beiderseits der Auflagefläche sind die Halteschienen 11 und 12 angeordnet, die das PTC-Heizelement seitlich begrenzen, wenn es auf die Auflagefläche 10 zwischen diesen Halteschienen 11 und 12 gelegt wird.The carrier profile body 1 has the contact surface 10 for receiving the PTC heating element. On both sides of the support surface, the holding rails 11 and 12 are arranged, which laterally limit the PTC heating element when it is placed on the supporting surface 10 between these holding rails 11 and 12.

Das PTC-Heizelement weist im vorliegenden Fall vier PTC-Widerstandselemente 2 auf. Bei dem erfindungsgemäßen Kaltleiter-PTC-Heizkörper können je nach Wahl und individueller Anordnung eine verschiedene Anzahl von Widerstandselementen angeordnet werden, wobei jeweils die Art der Wärmeübertragung und die Länge des Heizkörpers bestimmend sind. Die Positionsplatte 3 weist bei dem in Figur 1 dargestellten Heizkörper vier Durchbrüche 16 auf, die zur Aufnahme der vier PTC-Widerstandselemente 2 bestimmt sind und entsprechend an deren Größe angepaßt sind. Die Positionsplatte 3 besteht aus einem isolierenden Material und weist seitlich an beiden Rändern Kerben 17 auf. Die Elektrodenplatten 4 bzw. 5 dienen als Kontaktbleche und weisen an ihren Längsrändern nach unten bzw. nach oben abgewinkelte Nasen 18 bzw. 19 und Ausschnitte 20 bzw. 21 auf, wobei die Nasen und die Ausschnitte an den Elektrodenplatten in Bezug aufeinander so ausgerichtet sind, daß nach dem sandwichartigen Zusammenfügen des aus den Elektrodenplatten, der Positionsplatte und den PTC-Widerstandselementen bestehenden PTC-Heizelements und dem Umbiegen der Nasen 18 und 19 (Fahnen) die beiden Elektrodenplatten einander nicht berühren. Dieser Aufbau des PTC-Heizelements ist aus der DE-OS 30 42 420 bereits bekannt. Das dargestellte PTC-Heizelement weist demgegenüber jedoch den Vorteil auf, vollautomatisiert gefertigt werden zu können, da es sich nach der Montage selbst trägt und somit in derartigen automatisierten Fertigungsanlagen hergestellt werden kann.
Nachdem das Heizelement, wie beschrieben, zusammengefügt wurde, wird es von der Isolierfolie 7 umwickelt und liegt in diesem Zustand auf der Auflagefläche 10 des Trägerprofilkörpers 1 auf. Die Isolierfolie 7 isoliert das Heizelement elektrisch gegenüber dem Trägerprofilkörper 1, stellt aber einen guten Wärmeübergang sicher. Sie besteht daher aus einem gut wärmeleitfähigen Material.In the present case, the PTC heating element has four PTC resistance elements 2. In the PTC thermistor according to the invention, depending on the choice and individual arrangement, a different number of resistance elements can be arranged, the type of heat transfer and the length of the radiator being decisive in each case. In the heating element shown in FIG. 1, the position plate 3 has four openings 16 which are intended to accommodate the four PTC resistance elements 2 and are correspondingly adapted to their size. The position plate 3 consists of an insulating material and has notches 17 on both sides of the edges. The electrode plates 4 and 5 serve as contact plates and have lugs 18 and 19 and cutouts 20 and 21, which are angled downwards or upwards at their longitudinal edges, the lugs and the cutouts on the electrode plates being aligned with respect to one another in such a way that that after sandwiching the from the electrode plates, the position plate and the PTC resistance elements consisting of the PTC resistance elements and the bending of the lugs 18 and 19 (tabs), the two electrode plates do not touch one another. This structure of the PTC heating element is already known from DE-OS 30 42 420. In contrast, the PTC heating element shown has the advantage of being able to be produced fully automatically, since it carries itself after assembly and can therefore be produced in such automated production systems.
After the heating element has been assembled as described, it is wrapped by the insulating film 7 and in this state lies on the contact surface 10 of the carrier profile body 1. The insulating film 7 electrically insulates the heating element from the carrier profile body 1, but ensures good heat transfer. It is therefore made of a highly thermally conductive material.

Das eben beschriebene Heizelement wird auf die Auflagefläche 10 des Trägerprofilkörpers 1 gelegt. Es ist nunmehr auf beiden Seiten von den Haltschienen 11 bzw. 12 seitlich begrenzt, wobei die Endbereiche 13 bzw. 14, die im Querschnitt U-förmig sind, über das Heizelement hinausragen. Die Deckplatte 8 wird nunmehr zwischen die U-Schenkel der Halteschienen 11 und 12 eingeschoben, wobei der mittlere Flächenabschnitt 22 der Deckplatte 8 auf das PTC-Heizelement drückt. An den Randstreifen 23 bzw. 24 der Deckplatte 8 ist eine längs verlaufende Sicke 25 bzw. 26 ausgebildet. Werden die Randstreifen 23 bzw. 24 der Deckplatte 8 in die Halteschienen 11 bzw. 12 des Trägerprofilkörpers 1 eingeschoben, so sind die Sicken 25 bzw. 26 zwischen den U-Schenkeln der Endbereiche 13 bzw. 14 der Halteschienen 11 bzw. 12 angeordnet (siehe Figur 2). Hierdurch wird gewährleistet, daß die Deckplatte 8 mit dem Trägerprofilkörper 1 verspannt ist und der mittlere Bereich 22 auf das PTC-Heizelement drückt und hierdurch der erforderliche Wärmekontakt zwischen dem Trägerprofilkörper und der Deckplatte einerseits und dem PTC-Heizelement andererseits gewährleistet wird. Die gewünschte gute Wärmeleitung wird somit gewährleistet.The heating element just described is placed on the support surface 10 of the carrier profile body 1. It is now laterally delimited on both sides by the holding rails 11 and 12, the end regions 13 and 14, which are U-shaped in cross section, projecting beyond the heating element. The cover plate 8 is now inserted between the U-legs of the holding rails 11 and 12, the middle surface section 22 of the cover plate 8 pressing on the PTC heating element. A longitudinal bead 25 or 26 is formed on the edge strips 23 or 24 of the cover plate 8. If the edge strips 23 and 24 of the cover plate 8 are pushed into the holding rails 11 and 12 of the carrier profile body 1, the beads 25 and 26 are arranged between the U-legs of the end regions 13 and 14 of the holding rails 11 and 12 (see Figure 2). This ensures that the cover plate 8 with the Carrier profile body 1 is clamped and the central region 22 presses on the PTC heating element, thereby ensuring the required thermal contact between the carrier profile body and the cover plate on the one hand and the PTC heating element on the other. The desired good heat conduction is thus guaranteed.

Im Gebrauch wird die von dem Heizelement über die Elektrodenplatten 4 und 5 und die Isolierfolie 7 abgegebene Wärme zum einen direkt von dem Trägerprofilkörper 1 aufgenommen und zum anderen von der Deckplatte 8 abgenommen, von der sie ebenfalls in den Trägerprofilkörper 1 abgeleitet wird.In use, the heat given off by the heating element via the electrode plates 4 and 5 and the insulating film 7 is absorbed, on the one hand, directly by the carrier profile body 1 and, on the other hand, by the cover plate 8, from which it is also derived into the carrier profile body 1.

Figur 3 und Figur 4 zeigen eine andere Ausführungsform der vorliegenden Erfindung. Zusätzlich zu den eben beschriebenen Teilen ist bei dieser Ausführungsform ein Federblech 27 vorgesehen, das über die Deckplatte 8 geschoben wird. Zur Vereinfachung der Darstellung ist in Figur 3 das PTC-Heizelement weggelassen. In Figur 4 ist jedoch erkennbar, daß die Anschlußleiter 6, die zu dem PTC-Heizelement führen, unterhalb der Deckplatte 8 angeordnet sind und mithin das PTC-Heizelement auf der Auflagefläche 10 des Trägerprofilkörpers 1a ruht. Der in Figur 3 und Figur 4 dargestellte Trägerprofilkörper 1a ist an der von dem PTC-Heizelement abgewandten Seite anders ausgestaltet als der in Figur 1 und Figur 2 dargestellte Trägerprofilkörper 1. Es ist jedoch erkennbar, daß die Halteschienen 11 und 12 analog ausgestaltet sind und die Deckplatte 8 mit ihren Randstreifen 23 und 24 ebenfalls zwischen die U-Shenkel der Endbereiche 13 bzw. 14 der Halteschienen 11 bzw. 12 eingeschoben werden. Zusätzlich ist jedoch bei diesem Ausführungsbeispiel oberhalb von der Deckplatte 8 das Federblech 27 angeordnet, dessen mittlerer Flächenabschnitt 28 ausgebaucht ist und im eineschobenen Zustand auf den mittleren Flächenabschnitt 22 der Deckplatte 8 drückt. In dem in Figur 4 dargestellten verspannten Zustand bewirkt dieses Federblech 27 eine noch stärkere Verspannung des Deckkörpers 8 mit dem Trägerprofilkörper 1a. Hierdurch wird die gewünschte Wärmeleitung von dem PTC-Element auf die Deckplatte und auf den Trägerprofilkörper verstärkt. Selbstverständlich wäre es auch möglich, zusätzlich zu der in Figur 1 und Figur 2 dargestellten Ausführungsform ein derartiges Federblech 27 zu verwenden.Figure 3 and Figure 4 show another embodiment of the present invention. In addition to the parts just described, a spring plate 27 is provided in this embodiment, which is pushed over the cover plate 8. To simplify the illustration, the PTC heating element is omitted in FIG. 3. In Figure 4, however, it can be seen that the connecting conductors 6, which lead to the PTC heating element, are arranged below the cover plate 8 and consequently the PTC heating element rests on the contact surface 10 of the carrier profile body 1 a. The support profile body 1a shown in FIG. 3 and FIG. 4 is configured differently on the side facing away from the PTC heating element than the support profile body 1 shown in FIG. 1 and FIG. 2. However, it can be seen that the holding rails 11 and 12 are designed analogously and that Cover plate 8 with its edge strips 23 and 24 also between the U-legs of the end regions 13 and 14 of the holding rails 11 or 12 are inserted. In addition, in this exemplary embodiment, however, the spring plate 27 is arranged above the cover plate 8, the central surface section 28 of which is bulged and presses on the central surface section 22 of the cover plate 8 in the inserted state. In the tensioned state shown in FIG. 4, this spring plate 27 brings about an even stronger tensioning of the cover body 8 with the carrier profile body 1a. As a result, the desired heat conduction from the PTC element to the cover plate and onto the carrier profile body is reinforced. Of course, it would also be possible to use such a spring plate 27 in addition to the embodiment shown in FIGS. 1 and 2.

Die Form des Federblechs 27 ist im wesentlichen in den Randbereichen inetwa an die Oberfläche der Deckplatte 8 angepaßt. Dieses Federblech wirkt als vorgespannte Stahlfeder und es ist sinnvoll, bei höheren Temperaturen zusätzlich zur Verspannung ein derartiges Federblech zu verwenden. Die Deckplatte 8 besteht, wie bereits ausgeführt, üblicherweise aus Aluminium, wobei die Sicken 25 und 26 in dem Aluminium auf an sich übliche Weise ausgebildet wird.The shape of the spring plate 27 is substantially adapted to the surface of the cover plate 8 in the edge regions. This spring plate acts as a prestressed steel spring and it is useful to use such a spring plate in addition to the bracing at higher temperatures. As already stated, the cover plate 8 usually consists of aluminum, the beads 25 and 26 being formed in the aluminum in a manner which is conventional per se.

Der Trägerprofilkörper wird üblicherweise als Standpreßprofil ausgebildet.The carrier profile body is usually designed as a standing profile.

In der in Figur 3 und Figur 4 dargestellten Ausführungsform weist der Trägerprofilkörper 1a auf seiner dem PTC-Heizelement abgewandten Seite einen Kanal 29 auf, der einen Querschnitt hat, der auf der dem PTC-Heizelement abgewandten Seite offen ist. Bei dieser Ausgestaltung des Trägerprofilkörpers ist es auf besonders einfache Weise möglich, einen rohrförmigen Körper, der mit seiner Oberfläche an die Innenfläche des Kanals 29 angelegt wird, zu erwärmen.In the embodiment shown in FIG. 3 and FIG. 4, the carrier profile body 1 a has a channel 29 on its side facing away from the PTC heating element, which has a cross section that on the PTC heating element opposite side is open. With this configuration of the carrier profile body, it is possible in a particularly simple manner to heat a tubular body, the surface of which is applied to the inner surface of the channel 29.

Die Unterseite bzw. der untere Teil des Trägerprofilkörpers kann auch jede andere Gestalt haben, je nach dem wie der Umriß des zu beheizenden Körpers gestaltet ist.The underside or the lower part of the carrier profile body can also have any other shape, depending on how the outline of the body to be heated is designed.

Es sei betont, daß auf die Verwendung einer Isolierfolie verzichtet werden kann, wenn der Trägerprofilkörper aus einem isolierenden Material, beispielsweise einem Keramikmaterial besteht. Alternativ kann die Isolierung auch mittels Isolierplatten erfolgen, wie es an sich bereits aus dem Stand der Technik bekannt ist.It should be emphasized that the use of an insulating film can be dispensed with if the carrier profile body consists of an insulating material, for example a ceramic material. Alternatively, the insulation can also be carried out by means of insulating plates, as is already known per se from the prior art.

Für einen intensiven Wärmeübergang von der Oberseite des PTC-Heizelements ist es wichtig, daß die Halteschienen und die Deckplatte bzw. des Federblech in ihren Abmessungen so aufeinander abgestimmt sind, daß eine gute Passung erzielt wird, damit ausreichend große Wärmebrücken entstehen. Hierzu kann auch eine gewisse Elastizität des Materials des Trägerprofilkörpers beitragen, die ein geringfügiges Aufspreizen der U-Schenkel der Endbereiche 13 bzw. 14 der Halteschienen 11 bzw. 12 aufgrund entsprechender Passung gestattet.For intensive heat transfer from the top of the PTC heating element, it is important that the dimensions of the holding rails and the cover plate or the spring plate are matched to one another in such a way that a good fit is achieved so that sufficiently large thermal bridges are created. A certain elasticity of the material of the carrier profile body can also contribute to this, which allows a slight spreading of the U-legs of the end regions 13 and 14 of the holding rails 11 and 12 due to a corresponding fit.

Ferner sei ergänzend darauf hingewiesen, daß in Figur 2 die Sicken 25 bzw. 26 in der Deckplatte 8 im eingebauten Zustand noch dargestellt sind, wobei jedoch die Passung üblicherweise so erfolgt, daß die Sicken die Verspannung der Deckplatte derart bewirken, daß sie im eingebauten Zustand nicht mehr erkennbar sind.It should also be pointed out that in FIG. 2 the beads 25 and 26 in the cover plate 8 are still shown in the installed state, but the fit usually takes place in such a way that the beads cause the tension of the cover plate in such a way that they are no longer recognizable in the installed state.

Claims (7)

  1. A PTC resistor heating body comprising an elongate carrier profile body of thermally conductive material with at least one contact surface and at least one PTC-heating element which lies flat on the contact surface in heat-conducting communication on one side and which comprises an upper and a lower electrode plate and at least one PTC-resistance element disposed therebetween and a cover body with a surface portion which lies flat on the other side of the PTC-heating element, characterised in that provided on the carrier profile body (1) on both sides of the contact surface (10) are holding bars (11; 12) which each accommodate in closely fitting relationship the respective edge strips (23; 24) of the cover body which is in the form of a cover plate (8), and that at least one longitudinally extending corrugation (25; 26) is formed at each of said edge strips (23; 24) of the cover plate (8).
  2. A heating body according to claim 1 characterised in that the holding bars (11; 12) of the carrier profile body (1) are of U-shaped configuration in cross-section in their end regions (13; 14), wherein the corrugations (25; 26) of the cover plate (8) are arranged in the inserted condition between the U-limbs of the holding bars (11; 12) and the middle surface portion (22) of the cover plate (8) presses on to the PTC-heating element.
  3. A heating body according to claim 1 or claim 2 characterised in that additionally provided as a biasing means for mutually bracing the carrier profile body (1) to the cover plate (8) is a spring plate (27) which is inserted over the side of the cover plate (8) that is remote from the PTC-heating element, into the holding bars (11; 12) of the carrier profile body (1), and whose middle cambered surface portion (28) presses in the braced condition against the middle surface portion (22) of the cover plate (8).
  4. A heating body according to claim 1, claim 2 or claim 3 characterised in that on its side remote from the PTC-heating element (2, 3, 4, 5) the carrier profile body (1) has a passage (29) of a cross-section which is open on the side remote from the PTC-heating element.
  5. A heating body according to one of the preceding claims characterisd in that the carrier profile body (1) and the cover plate (8) comprise a metal and the PTC-heating element is electrically insulated from same by an insulation (7) comprising an electrically insulating material which has good thermal conductivity.
  6. A heating body according to claim 5 characterised in that the insulation (7) is formed by a foil which is wound around the PTC-heating element (2, 3, 4, 5).
  7. A heating body according to one of the preceding claims characterized in that the passage (29) is of an approximately semicircular cross-section.
EP19880104821 1988-03-25 1988-03-25 PTC heating resistor Expired - Lifetime EP0333906B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19880104821 EP0333906B1 (en) 1988-03-25 1988-03-25 PTC heating resistor
DE88104821T DE3885087D1 (en) 1988-03-25 1988-03-25 PTC thermistor.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19880104821 EP0333906B1 (en) 1988-03-25 1988-03-25 PTC heating resistor

Publications (2)

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EP0333906A1 EP0333906A1 (en) 1989-09-27
EP0333906B1 true EP0333906B1 (en) 1993-10-20

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EP (1) EP0333906B1 (en)
DE (1) DE3885087D1 (en)

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KR101076191B1 (en) * 2008-12-05 2011-10-21 현대자동차주식회사 PTC Rod Assembly and PTC Heater Using the Same
EP2395295B1 (en) * 2010-06-11 2013-03-06 Behr GmbH & Co. KG Heat exchanger
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US7332693B2 (en) 2003-12-20 2008-02-19 Eichenauer Heizelemente Gmbh & Co. Kg Tube and method for bracing functional elements in the same

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Publication number Publication date
DE3885087D1 (en) 1993-11-25
EP0333906A1 (en) 1989-09-27

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