EP0573691B1 - Method for producing a PTC heating element - Google Patents
Method for producing a PTC heating element Download PDFInfo
- Publication number
- EP0573691B1 EP0573691B1 EP19920109860 EP92109860A EP0573691B1 EP 0573691 B1 EP0573691 B1 EP 0573691B1 EP 19920109860 EP19920109860 EP 19920109860 EP 92109860 A EP92109860 A EP 92109860A EP 0573691 B1 EP0573691 B1 EP 0573691B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- webs
- hollow body
- section
- curved
- pressing
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims description 3
- 238000004519 manufacturing process Methods 0.000 title description 5
- 238000003825 pressing Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- 239000004411 aluminium Substances 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 238000000605 extraction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
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
-
- 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
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/02—Heaters using heating elements having a positive temperature coefficient
Definitions
- the present invention relates to a manufacturing method for a PTC heater according to claim 1.
- an electric heater which contains a PTC element which is pressed into a hollow extruded profile.
- the narrow sides of the extruded profile are pressed together on both sides in such a way that they assume an approximately bell-shaped contour in cross section.
- the deformed narrow sides create a spring effect between the top and bottom surface of the extruded profile and thus clamp the PTC element firmly.
- the present invention is based on the object of specifying a production method for a PTC radiator with which a well-defined contact pressure can be achieved in a simple manner.
- the shape of the extruded profile thus produced ensures that even with dimensional tolerances in the PTC element and in the extruded profile, as well as tolerances in the movement of the die, there are only slight deviations in the contact pressure.
- the web and the outwardly curved sections give in when pressed when a force is reached which is necessary to deform the material inelastically, without the force being increased significantly with a further movement of the die.
- a defined contact pressure is retained, which is determined by the spring action of the web and the curved section.
- the hollow extruded profile is pressed outside the webs in the region of the curved sections, as seen from the axis of symmetry. Compression at this point is particularly favorable because the webs can be deformed better when they are inclined outwards due to the deformation of the curved regions.
- an extruded profile which has a web with a height which corresponds approximately to half the inside height of the hollow body before the pressing.
- a radiator with the specified aspect ratio has sufficient rigidity in its structure so that the PTC element is not damaged during pressing.
- the inelastic deformation of the curved sections takes place in such a way that the spring action is particularly good.
- an extruded profile is used in which the curved section is at least the clear height of the hollow body stands laterally beyond the web.
- the legs or end points of the U-shaped to part-circular curved sections almost touch after the pressing. This extremely strong curvature of the curved section leads to particularly good spring properties.
- an extruded profile is used, in which the base surface is provided with lateral flanges which protrude beyond the web and the curved section on both sides.
- the side flanges enlarge the base area of the PTC radiator, whereby better heat extraction is achieved.
- an extruded profile is used in which the top surface is circular sector-shaped in cross-section, the rounded side being on the outside.
- a cover surface shaped in this way prevents a wave formation during the pressing in the central region of the hollow body profile, which lies flat on the PTC element, thereby ensuring optimal heat extraction from the PTC element to the cover surface.
- the radiator has an extruded profile 1, with an essentially rectangular and flat base plate 2, which is provided with lateral flanges 3 along its long sides.
- the flanges 3 are formed in one piece with the base plate 2 and enlarge the base area of the PTC radiator.
- the base surface has two vertical webs 4 running in the longitudinal direction. Each web 4 is followed by an approximately U-shaped to partially circular curved section 5.
- the lower leg ends of the curved sections 5 form an approximately right angle with the outer wall of the webs, as seen from the axis of symmetry.
- the curved sections 5 extend in the longitudinal direction over the entire length of the radiator.
- the two upper leg ends are connected to one another via a flat cover surface 6, which lies opposite the base surface.
- the cover surface 6 has a circular sector-shaped shape in cross section, the outer side being rounded.
- the extruded profile is mirror-symmetrical.
- a cavity is formed in the interior of the extruded profile, the clear height H of which corresponds to the height h of the web before pressing in a ratio of about 2: 1.
- a PTC element is arranged in the cavity in the area between the webs 4.
- the PTC element is a cuboid plate, the dimensions of which are preferably chosen so that the space available between the webs is completely or almost completely filled.
- the thickness of the cuboid PTC element is somewhat larger (approx. 20%) than the height h of the webs 4, so that the PTC element projects slightly beyond the webs 4 vertically.
- the PTC element 8 is provided in a manner not shown on the top and bottom surface with a metallic electrode and this unit, consisting of PTC element 8 and electrodes, is encased in a tubular Kapton film.
- the PTC heater of Figure 1 is shown after the mechanical deformation (pressing).
- the pressing is carried out on the lines P, which are seen from the axis of symmetry on the edge of the webs 4 or just at the webs 5 outside the webs 4 in the region of the curved sections 5. Due to the pressure applied, the curved sections 5 are pressed together until their legs or end points almost touch. The pressing is continued even if the inner surfaces of the cover surface have already touched the PTC element. The central areas of the curved sections experience the greatest inelastic deformation. If the stamp is pressed further down, the lower leg ends are bent in the direction of the base plate. In this case, the webs 4 standing vertically before the pressing are inelastically deformed, namely bent outwards.
- a particularly favorable deformation of the webs is when the webs make an angle of preferably 20 ° with the vertical.
- the circular sector-shaped cross section of the top surface 6 of the extruded profile causes reinforcement in the central region of the top surface. This reinforcement does not deform the top surface during pressing. This is extremely important, since the smooth support of the top surface on the top of the PTC element is a prerequisite for good heat extraction.
Landscapes
- Resistance Heating (AREA)
- Thermistors And Varistors (AREA)
Description
Die vorliegende Erfindung bezieht sich auf ein Herstellungsverfahren für einen PTC-Heizkörper gemäß Anspruch 1.The present invention relates to a manufacturing method for a PTC heater according to claim 1.
Aus der DE GM 78 38 558 ist ein elektrischer Heizkörper bekannt, welcher ein PTC-Element enthält, das in ein Hohlkörper-Strangpreßprofil eingepreßt ist. Bei der Herstellung eines solchen Heizkörpers werden die Schmalseiten des Strangpreßprofils beidseitig derart zusammengepreßt, daß sie im Querschnitt eine etwa glockenförmige Kontur annehmen. Die verformten Schmalseiten erzeugen zwischen der Deck- und Grundfläche des Strangpreßprofils eine Federwirkung und spannen damit das PTC-Element fest ein. Bei der Herstellung dieses Heizkörpers ist es jedoch schwierig, den Druck, mit dem das PTC-Element im Hohlprofil eingeklemmt ist, genau zu definieren. Es besteht sogar die Gefahr, daß das PTC-Element beim Zusammendrücken der Schmalseiten überbeansprucht wird und dadurch dauerhaft beschädigt wird. Bei zu geringem Anpreßdruck ist hingegen die Wärmeübertragung und eventuell auch der elektrische Kontakt ungenügend.From DE GM 78 38 558 an electric heater is known which contains a PTC element which is pressed into a hollow extruded profile. In the manufacture of such a radiator, the narrow sides of the extruded profile are pressed together on both sides in such a way that they assume an approximately bell-shaped contour in cross section. The deformed narrow sides create a spring effect between the top and bottom surface of the extruded profile and thus clamp the PTC element firmly. When manufacturing this radiator, however, it is difficult to precisely define the pressure with which the PTC element is clamped in the hollow profile. There is even a risk that the PTC element will be overstressed when the narrow sides are pressed together and thereby permanently damaged. If the contact pressure is too low, however, the heat transfer and possibly also the electrical contact is insufficient.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Herstellungs-verfahren für einen PTC-Heizkörper anzugeben, mit dem auf einfache Weise ein gut definierter Anpreßdruck erzielbar ist.The present invention is based on the object of specifying a production method for a PTC radiator with which a well-defined contact pressure can be achieved in a simple manner.
Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.
Durch die Formgebung des so hergestellten Strangpreßprofils wird auf einfache Weise erreicht, daß auch bei Maßtoleranzen im PTC-Element und im Strangpreßprofil sowie bei Toleranzen in der Bewegung des Prägestempels nur geringe Abweichungen im Anpreßdruck entstehen. Der Steg und die nach außen gekrümmten Abschnitte geben beim Verpressen bei Erreichen einer Kraft, die notwendig ist, um das Material unelastisch zu verformen, nach, ohne daß die Kraft bei einer weiteren Bewegung des Prägestempels wesentlich erhöht wird. Beim anschließenden Zurückziehen des Prägestempels bleibt ein definierter Anpreßdruck erhalten, der durch die Federwirkung des Stegs und des gekrümmten Abschnitts festgelegt ist.The shape of the extruded profile thus produced ensures that even with dimensional tolerances in the PTC element and in the extruded profile, as well as tolerances in the movement of the die, there are only slight deviations in the contact pressure. The web and the outwardly curved sections give in when pressed when a force is reached which is necessary to deform the material inelastically, without the force being increased significantly with a further movement of the die. When the stamp is subsequently withdrawn, a defined contact pressure is retained, which is determined by the spring action of the web and the curved section.
Bei einer bevorzugten Ausführungsform des Verfahrens erfolgt die Verpressung des Hohlkörper-Strangpreßprofils von der Symmetrieachse aus gesehen außerhalb der Stege im Bereich der gekrümmten Abschnitte. Eine Verpressung an dieser Stelle ist besonders günstig, weil sich damit die Stege besser verformen lasen wenn sie durch die Verformung der gekrümmten Bereiche nach außen geneigt werden.In a preferred embodiment of the method, the hollow extruded profile is pressed outside the webs in the region of the curved sections, as seen from the axis of symmetry. Compression at this point is particularly favorable because the webs can be deformed better when they are inclined outwards due to the deformation of the curved regions.
In einer weiteren bevorzugten Ausführung der Verfahrens wird ein Strangpreßprofil verwendet, welches einen Steg mit einer Höhe aufweist, die in etwa der halben lichten Höhe des Hohlkörpers vor dem Verpressen entspricht. Ein Heizkörper mit dem angegebenen Längenverhältnis besitzt einerseits eine ausreichende Steifigkeit in seinem Aufbau, damit das PTC-Element beim Verpressen nicht beschädigt wird. Andererseits erfolgt die unelastische Verformung der gekrümmten Abschnitte derart, daß die Federwirkung besonders gut ist.In a further preferred embodiment of the method, an extruded profile is used which has a web with a height which corresponds approximately to half the inside height of the hollow body before the pressing. On the one hand, a radiator with the specified aspect ratio has sufficient rigidity in its structure so that the PTC element is not damaged during pressing. On the other hand, the inelastic deformation of the curved sections takes place in such a way that the spring action is particularly good.
In einer vorteilhaften Ausgestaltung des Verfahrens wird ein Strangpreßprofil verwendet, bei dem der gekrümmte Abschnitt um mindestens die lichte Höhe des Hohlkörpers seitlich über den Steg hinaus steht. Dadurch wird die Federwirkung eines so ausgeformten gekrümmten Abschnitts ebenfalls verbessert.In an advantageous embodiment of the method, an extruded profile is used in which the curved section is at least the clear height of the hollow body stands laterally beyond the web. As a result, the spring action of a curved section shaped in this way is also improved.
Gemäß einem Ausführungsbeispiel berühren sich nach dem Verpressen die Schenkel bzw. Endpunkte der U-förmig bis teilkreisförmig gekrümmten Abschnitte nahezu. Diese extrem starke Krümmung des gekrümmten Abschnitts führt zu besonders guten Federeigenschaften.According to one embodiment, the legs or end points of the U-shaped to part-circular curved sections almost touch after the pressing. This extremely strong curvature of the curved section leads to particularly good spring properties.
In einer vorteilhaften Weiterbildung des Verfahrens wird ein Strangpreßprofil verwendet, bei dem die Grundfläche mit seitlichen Flanschen versehen ist, welche auf beiden Seiten über den Steg und den gekrümmten Abschnitt überstehen. Die seitlichen Flansche vergrößern die Grundfläche des PTC-Heizkörpers, wobei eine bessere Wärmeauskopplung erzielt wird.In an advantageous development of the method, an extruded profile is used, in which the base surface is provided with lateral flanges which protrude beyond the web and the curved section on both sides. The side flanges enlarge the base area of the PTC radiator, whereby better heat extraction is achieved.
Gemäß einer bevorzugten Ausführungsform des Verfahrens wird ein Strangpreßprofil verwendet, bei dem die Deckfläche im Querschnitt kreissektorförmig ist, wobei die abgerundete Seite außenliegt. Eine so geformte Deckfläche verhindert während des Verpressens eine Wellenbildung in dem mittigen Bereich des Hohlkörperprofils, der auf dem PTC-Element glatt aufliegt, wodurch eine optimale Wärmeauskopplung von dem PTC-Element zur Deckfläche sichergestellt ist.According to a preferred embodiment of the method, an extruded profile is used in which the top surface is circular sector-shaped in cross-section, the rounded side being on the outside. A cover surface shaped in this way prevents a wave formation during the pressing in the central region of the hollow body profile, which lies flat on the PTC element, thereby ensuring optimal heat extraction from the PTC element to the cover surface.
Ein gemäss der Erfindung hergestelltes bevorzugtes Ausführungsbeispiel eines PTC-Heizkörpers wird im folgenden anhand der beiliegenden Zeichnungen näher erläutert, welche zeigen:
- Fig. 1
- einen Querschnitt durch einen PTC-Heizkörper vor dem Verpressen des Strangpreßprofils, und
- Fig. 2
- einen Querschnitt durch den PTC-Heizkörper nach dem Verpressen des Strangpreßprofils.
- Fig. 1
- a cross-section through a PTC heater before pressing the extruded profile, and
- Fig. 2
- a cross section through the PTC radiator after pressing the extruded profile.
Der Heizkörper weist ein Strangpreßprofil 1 auf, mit einer im wesentlichen rechteckförmigen und ebenen Grundplatte 2, die entlang ihrer Längsseiten mit seitlichen Flanschen 3 versehen ist. Die Flansche 3 sind einstückig mit der Grundplatte 2 ausgebildet und vergrößern die Grundfläche des PTC-Heizkörpers. Die Grundfläche weist zwei in Längsrichtung verlaufende senkrecht stehende Stege 4 auf. An jeden Steg 4 schließt sich ein etwa U-förmig bis teilkreisförmig gebildeter gekrümmter Abschnitt 5 an. Die unteren Schenkelenden der gekrümmten Abschnitte 5 bilden mit den von der Symmetrieachse aus gesehen außenliegenden Wand der Stege einen in etwa rechten Winkel. Die gekrümmten Abschnitte 5 erstrecken sich in Längsrichtung über die gesamte Länge des Heizkörpers. Die beiden oberen Schenkelenden sind über eine ebene Deckfläche 6, welche der Grundfläche gegenüberliegt, miteinander verbunden. Die Deckfläche 6 weist eine im Querschnitt kreissektorförmige Form auf, wobei die außenliegende Seite abgerundet ist.The radiator has an extruded profile 1, with an essentially rectangular and
Insgesamt gesehen ist das Strangpreßprofil spiegelsymmetrisch ausgebildet.Seen overall, the extruded profile is mirror-symmetrical.
Im Innern des Strangpreßprofils ist ein Hohlraum ausbildet, dessen lichte Höhe H zu der Höhe h des Steges vor dem Verpressen in einem Verhältnis von etwa 2:1 steht. In dem Hohlraum ist in dem Bereich zwischen den Stegen 4 ein PTC-Element angeordnet. Das PTC-Element ist eine quaderförmige Platte, deren Abmessungen vorzugsweise so gewählt sind, daß der zwischen den Stegen zur Verfügung stehende Zwischenraum vollständig oder nahezu vollständig ausgefüllt ist. Die Dicke des quaderförmigen PTC-Elements ist etwas größer (ca. 20 %) als die Höhe h der Stege 4, so daß das PTC-Element vertikal etwas über die Stege 4 hinaussteht. Das PTC-Element 8 ist in nicht näher dargestellter Weise auf der Deck- und Grundfläche noch mit je einer metallischen Elektrode versehen und diese Einheit, bestehend aus PTC-Element 8 und Elektroden, ist in eine schlauchförmige Kaptonfolie eingehüllt.A cavity is formed in the interior of the extruded profile, the clear height H of which corresponds to the height h of the web before pressing in a ratio of about 2: 1. A PTC element is arranged in the cavity in the area between the
In Figur 2 ist der PTC-Heizkörper der Figur 1 nach der mechanischen Verformung (Verpressung) dargestellt. Die Verpressung ist an den Linien P, welche sich von der Symmetrieachse aus gesehen am Rande der Stege 4 oder knapp an den Stegen 5 außerhalb der Stege 4 im Bereich der gekrümmten Abschnitte 5 befinden, erfolgt. Durch den angelegten Druck werden die gekrümmten Abschnitte 5 soweit zusammengepreßt, bis sich ihre Schenkel bzw. Endpunkte nahezu berühren. Die Verpressung wird auch dann noch weitergeführt, wenn sich die Innenflächen der Deckfläche bereits an das PTC-Element angelegt hat. Dabei erfahren die mittigen Bereiche der gekrümmten Abschnitte die größte unelastische Verformung. Wird der Prägestempel noch weiter nach unten gedrückt, werden die unteren Schenkelenden in Richtung der Bodenplatte abgebogen. Dabei werden auch die vor dem Verpressen senkrecht stehenden Stege 4 unelastisch verformt, nämlich nach außen gebogen. Eine besonders günstige Verformung der Stege ist diejenige, wenn die Stege einen Winkel von vorzugsweise 20° mit der Senkrechten einnehmen.In Figure 2, the PTC heater of Figure 1 is shown after the mechanical deformation (pressing). The pressing is carried out on the lines P, which are seen from the axis of symmetry on the edge of the
Durch die starke Verformung, nachdem sich die Deckfläche 6 bereits an das PTC-Element 8 angelegt hat, ergibt sich eine Federwirkung, die das PTC-Element 8 dauerhaft und fest umklammert. Trotzdem wird das PTC-Element 8 nicht mit zu hoher Kraft beim Verpressen beansprucht, da das Material durch den Gegendruck, den das PTC-Element 8 ausübt, nachgeben kann, was auf die hier vorliegende Formgebung zurückzuführen ist.The strong deformation after the
Der kreissektorförmige Querschnitt der Deckfläche 6 des Strangpreßprofils bewirkt eine Verstärkung in dem mittigen Bereich der Deckfläche. Durch diese Verstärkung wird die Deckfläche während des Verpressens nicht verformt. Dies ist von außerordentlicher Wichtigkeit, da die glatte Auflage der Deckfläche auf der Oberseite des PTC-Elements eine Voraussetzung für eine gute Wärmeauskopplung ist.The circular sector-shaped cross section of the
Claims (7)
- Method of producing a PTC heating element with a hollow body extruded section (1) composed of metal, preferably aluminium, and a PTC element (8) pressed therein, wherein the extruded section (1) has a base face (2) on which two webs (4) extending in the longitudinal direction are disposed, which before pressing stand approximately perpendicular to the plane of the base face (2), and the webs (4) are connected to a cover face (6) via sections (5) which are curved outwards in an approximately U-shaped to semi-circular manner, and the method comprises the following step:
deformation of the extruded section (1) in such a manner that the radius of curvature of the curved sections (5) is reduced, that the webs (4) are inclined outwards relative to the perpendicular by an angle of approximately 10° to 30°, preferably 20°, and that the cover face is brought into contact with the PTC element (8). - Method according to claim 1, characterised in that pressing takes place outside the webs (4) in the region of the curved sections (5) viewed from the axis of symmetry.
- Method according to claim 1 or 2, characterised in that a hollow body profile is used, whose web (4) has a height (h), which is approximately half the clear height (H) of the hollow body before pressing.
- Method according to one of claims 1 to 3, characterised in that a hollow body pressed profile is used, whose curved sections (5) project laterally beyond the web (4) by at least the clear height (H) of the hollow body.
- Method according to one of claims 1 to 4, characterised in that the arms or end points of the U-shaped to semi-circular curved sections (5) almost touch after pressing.
- Method according to one of claims I to 5, characterised in that a hollow-body extruded section is used whose base face (2) is provided with lateral flanges (3), which project beyond the web (4) and the curved section (5) on both sides.
- Method according to one of claims 1 to 6, characterised in that a hollow body extruded section is used whose cover face (6) has a shape of the sector of a circle in cross-section with the rounded side lying on the outside.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19920109860 EP0573691B1 (en) | 1992-06-11 | 1992-06-11 | Method for producing a PTC heating element |
| DE59207853T DE59207853D1 (en) | 1992-06-11 | 1992-06-11 | Process for the production of a PTC radiator |
| ES92109860T ES2099767T3 (en) | 1992-06-11 | 1992-06-11 | METHOD TO PRODUCE A HEATING RESISTANCE WITH POSITIVE TEMPERATURE COEFFICIENT. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19920109860 EP0573691B1 (en) | 1992-06-11 | 1992-06-11 | Method for producing a PTC heating element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0573691A1 EP0573691A1 (en) | 1993-12-15 |
| EP0573691B1 true EP0573691B1 (en) | 1997-01-08 |
Family
ID=8209702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920109860 Expired - Lifetime EP0573691B1 (en) | 1992-06-11 | 1992-06-11 | Method for producing a PTC heating element |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0573691B1 (en) |
| DE (1) | DE59207853D1 (en) |
| ES (1) | ES2099767T3 (en) |
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| DE10360159A1 (en) * | 2003-12-20 | 2005-07-21 | Eichenauer Heizelemente Gmbh & Co. Kg | Profile tube and method for clamping functional elements in such |
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| FR2749645B1 (en) * | 1996-06-11 | 1998-07-17 | Suntec Ind France | AUTO REGULATED FUEL HEATER |
| DE19922668B4 (en) * | 1999-05-18 | 2020-03-05 | Mahle International Gmbh | Radiators for automobiles |
| DE29911713U1 (en) * | 1999-07-06 | 2000-08-31 | Fritz Eichenauer GmbH & Co. KG Fabrik elektr. Spezialartikel, 76870 Kandel | Heating device for fluids |
| US6455822B1 (en) * | 2000-10-11 | 2002-09-24 | Mega Dynamics Ltd. | Heat sink for a PTC heating element and a PTC heating member made thereof |
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| DE102011077922B4 (en) * | 2011-06-21 | 2024-10-10 | Mahle International Gmbh | heat exchanger |
| DE102012104917B4 (en) | 2012-06-06 | 2023-03-23 | Eichenauer Heizelemente Gmbh & Co. Kg | Electrical heating device |
| CN104896746B (en) * | 2015-06-09 | 2018-09-07 | 广东美的环境电器制造有限公司 | A kind of the heating element mounting structure and warm-air drier of warm-air drier |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3996447A (en) * | 1974-11-29 | 1976-12-07 | Texas Instruments Incorporated | PTC resistance heater |
| US4698614A (en) * | 1986-04-04 | 1987-10-06 | Emerson Electric Co. | PTC thermal protector |
| DE3942266C2 (en) * | 1989-12-21 | 1997-01-30 | Tuerk & Hillinger Gmbh | PTC radiator |
| DE4010620A1 (en) * | 1990-04-02 | 1991-10-10 | Petz Elektro Waerme Techn | Electric heating element for fan heater - has C-clips between longitudinal edges of opposing profile rails |
-
1992
- 1992-06-11 ES ES92109860T patent/ES2099767T3/en not_active Expired - Lifetime
- 1992-06-11 EP EP19920109860 patent/EP0573691B1/en not_active Expired - Lifetime
- 1992-06-11 DE DE59207853T patent/DE59207853D1/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10360159A1 (en) * | 2003-12-20 | 2005-07-21 | Eichenauer Heizelemente Gmbh & Co. Kg | Profile tube and method for clamping functional elements in such |
| US7332693B2 (en) | 2003-12-20 | 2008-02-19 | Eichenauer Heizelemente Gmbh & Co. Kg | Tube and method for bracing functional elements in the same |
| US8229289B2 (en) | 2006-03-21 | 2012-07-24 | Rittal Gmbh & Co. Kg | Condensate discharge by means of condensate evaporation in a cooling device |
| DE102008056083A1 (en) * | 2008-07-21 | 2010-02-04 | Eichenauer Heizelemente Gmbh & Co. Kg | Heater manufacturing method, involves introducing heater with cone-shaped positive temperature coefficient heating element in housing that is compressed in region surrounding element, where impressed recesses are impressed in housing |
| DE102008056083B4 (en) | 2008-07-21 | 2021-08-12 | Borgwarner Ludwigsburg Gmbh | Method of making a heater and heater |
| DE102011057017A1 (en) | 2011-12-23 | 2013-06-27 | Dbk David + Baader Gmbh | Heating assembly for heating e.g. ammonia in ammonia storage and delivery system for diesel engine of lorry, has coupling layer arranged in circumference gap between sleeve wall and cartridge wall for thermal and/or mechanical coupling |
| DE102013103433A1 (en) | 2012-04-13 | 2013-10-17 | Dbk David + Baader Gmbh | Electric auxiliary heater for motor vehicle, has sealing unit has two form-seals, which sealingly surround control housing-side end portion and distal end portion of heating housing |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2099767T3 (en) | 1997-06-01 |
| EP0573691A1 (en) | 1993-12-15 |
| DE59207853D1 (en) | 1997-02-20 |
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