EP0010275B1 - Tubular heating element - Google Patents
Tubular heating element Download PDFInfo
- Publication number
- EP0010275B1 EP0010275B1 EP79103944A EP79103944A EP0010275B1 EP 0010275 B1 EP0010275 B1 EP 0010275B1 EP 79103944 A EP79103944 A EP 79103944A EP 79103944 A EP79103944 A EP 79103944A EP 0010275 B1 EP0010275 B1 EP 0010275B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insulating
- bead
- tubular
- insulating bead
- insulating material
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 239000011324 bead Substances 0.000 claims abstract description 37
- 239000011810 insulating material Substances 0.000 claims abstract description 17
- 229920002545 silicone oil Polymers 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 3
- 238000007373 indentation Methods 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location 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
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
Definitions
- the invention relates to a tubular heater, in which a heating coil is embedded in a jacket tube made of deformable metal in insulating material, which is connected at the connection ends with connecting bolts which have a bolt part with a larger diameter, which is embedded in the insulating material, and a bolt part with a smaller one Diameter which has an insulating bead inserted into the front end of the jacket tube and mechanically held by the jacket tube.
- This known tubular heater however, has the disadvantage that, due to the use of an adhesive, the tubular heater has only a limited temperature resistance.
- a tubular heater end seal is also known, in which the seal is made by means of a temperature-resistant glaze.
- a temperature-resistant glaze With such a glaze seal, however, there is a risk that it will crack as a result of large temperature fluctuations and consequently represents an insufficient seal against moisture.
- the insulation effect can be reduced by a residual moisture remaining in the interior of the tubular heating element during manufacture, since the residual moisture cannot escape from the tubular heating element due to the moisture-tight seal.
- DE-A-1 615 424 it is known from DE-A-1 615 424 to provide a viscous sealing compound between the insulating material in which the heating coil is embedded and the insulating plug provided at the connection end, through which the connecting bolt is passed, which expels when the tubular heater is heat-treated any residual moisture that is still present is allowed and then assumes a viscous or gelatinous consistency towards the end of the heat treatment.
- an additional sealing compound is necessary.
- DE-A-2 531 529 it is known for the end seal of an electric tubular heater, while omitting such an additional sealing compound, to press in the plug of insulating material provided for the end seal at the front end of the casing tube.
- Relatively complex fastening means in the form of screws are known from FR-A-803 095 and US Pat. No. 2,046,102 for fastening the connecting bolt in the insulating bead, with US Pat. No. 2,046,102 for mechanical fastening of the insulating bead in the casing tube additional holding means which engage in circumferential grooves on the inner wall of the casing tube are provided.
- additional sealing rings are required in order to achieve an adequate seal between the insulating bead and the casing tube.
- the object of the invention is to provide a tubular heater of the type mentioned, in which, despite the possibility of escape of residual moisture present in the jacket tube, a mechanical mounting of the insulating bead relative to the jacket tube and a mechanical attachment of the connecting bolt in the insulating bead with simple means, without additional fasteners is achieved.
- a securing ring can advantageously be placed between the impression and the insulating bead.
- the tubular heating element on the one hand, has a very high temperature resistance of about 600 ° C. due to the mechanical holder and, on the other hand, is no longer exposed to its insulation effect due to moisture.
- an electric tubular heater has a jacket tube 1, in which there is a heating coil 3 embedded in insulating material 2 soaked in silicone oil.
- a connecting pin 4 is provided, which can be connected to an electrical power source, not shown.
- the connecting bolt 4 also has a part with a larger diameter and a part with a smaller diameter.
- the bolt part with a larger diameter is embedded in the insulating material 2 and electrically connected to the heating coil 3, while the subsequent bolt part with a small diameter runs a bit in the casing tube 1 and then protrudes from the tubular heating element for connection to a power source.
- the cross-sectional jump of the connecting bolt 4 is thus in one plane with the insulating material.
- an insulating bead 5 with a corresponding through hole is pushed in part over the small-diameter bolt part until the cross-sectional jump of the connecting bolt 4.
- the insulation bead 5, graduated in diameter has approximately the same outside diameter as the insulation material on the side facing the insulation material 2.
- a locking ring 6 is pushed onto the connecting pin 4 following the insulating bead.
- the connecting bolt 4 is pressed off when the insulating bead 5 is firmly pushed on in the vicinity of the securing ring 6.
- the locking ring 6 is pressed in the direction of the inside of the tubular heating element and thus the insulating bead is pressed against the insulating material.
- the connecting bolt 4 attains a certain strength with respect to the jacket tube 1
- the larger diameter part of the insulating bead 5 is pressed between two constrictions or pinches of the jacket tube. Since a mechanical holder 7 of the insulating bead is sufficient by using an insulating material 2 impregnated with silicone oil, any residual moisture in the jacket tube can escape to the outside at any time.
- Fig. 2 differs from the above only in that a triangular bead 8 is used instead of a round bead 5.
Landscapes
- Resistance Heating (AREA)
Abstract
Description
Die Erfindung betrifft einen Rohrheizkörper, bei dem in einem Mantelrohr aus verformbarem Metall in Isoliermaterial eine Heizwendel eingebettet ist, die an den Anschlußenden mit Anschlußbolzen verbunden ist, welche einen Bolzenteil mit einem größeren Durchmesser, der im Isoliermaterial eingebettet ist, und einen Bolzenteil mit einem geringeren Durchmesser, der durch eine in das Stirnende des Mantelrohres eingesetzte und durch das Mantelrohr mechanisch gehaltene Isolierperle hindurchgeführt ist, aufweisen.The invention relates to a tubular heater, in which a heating coil is embedded in a jacket tube made of deformable metal in insulating material, which is connected at the connection ends with connecting bolts which have a bolt part with a larger diameter, which is embedded in the insulating material, and a bolt part with a smaller one Diameter which has an insulating bead inserted into the front end of the jacket tube and mechanically held by the jacket tube.
Es ist bei Rohrheizkörpern bekannt, die Isolierperlen mittels eines Klebers in die Innenwandung des Mantelrohrabschlusses einzukleben. Auf diese Weise wird verhindert, daß Feuchtigkeit in das Innere des Rohrheizkörpers gelangen kann und die Isolationswirkung des Isoliermaterials herabgesetzt wird.In the case of tubular heaters, it is known to glue the insulating beads into the inner wall of the tubular casing end using an adhesive. In this way it is prevented that moisture can get inside the tubular heating element and the insulating effect of the insulating material is reduced.
Dieser bekannte Rohrheizkörper weist jedoch den Nachteil auf, daß infolge der Verwendung eines Klebers nur eine beschränkte Temperaturbeständigkeit des Rohrheizkörpers gegeben ist.This known tubular heater, however, has the disadvantage that, due to the use of an adhesive, the tubular heater has only a limited temperature resistance.
Es ist weiterhin eine Rohrheizkörperendenabdichtung bekannt, bei der die Abdichtung mittels einer temperaturbeständigen Glasur erfolgt. Bei einer derartigen Glasurabdichtung besteht jedoch die Gefahr, daß diese infolge großer Temperaturschwankungen reißt und demzufolge eine ungenügende Abdichtung gegenüber Feuchtigkeit darstellt.A tubular heater end seal is also known, in which the seal is made by means of a temperature-resistant glaze. With such a glaze seal, however, there is a risk that it will crack as a result of large temperature fluctuations and consequently represents an insufficient seal against moisture.
Andererseits kann bei beiden vorerwähnten Rohrheizkörperendenabdichtungen die Isolationswirkung durch eine im Rohrheizkörperinneren bei der Herstellung verbliebene Restfeuchtigkeit herabgesetzt sein, da die Restfeuchtigkeit durch den feuchtigkeitsdichten Abschluß nicht aus dem Rohrheizkörper entweichen kann.On the other hand, in both of the above-mentioned tubular heating element end seals, the insulation effect can be reduced by a residual moisture remaining in the interior of the tubular heating element during manufacture, since the residual moisture cannot escape from the tubular heating element due to the moisture-tight seal.
Hierzu ist es aus der DE-A-1 615 424 bekannt, zwischen dem Isoliermaterial, in welchem die Heizwendel eingebettet ist und dem am Anschlußende vorgesehenen Isolierpfropfen, durch den der Anschlußbolzen hindurchgeführt ist, eine viskose Dichtmasse vorzusehen, die bei Wärmebehandlung des Rohrheizkörpers ein Austreiben evtl. noch vorhandener Restfeuchtigkeit erlaubt und die dann gegen Ende der Wärmebehandlung eine zähflüssige oder gallertartige Konsistenz annimmt. Bei diesem bekannten Rohrheizkörper ist insofern eine zusätzliche Dichtmasse notwendig. Aus der DE-A-2 531 529 ist es zur Endenabdichtung eines elektrischen Rohrheizkörpers bekannt, unter Fortlassung einer derartigen zusätzlichen Dichtmasse, den für die Endenabdichtung vorgesehenen Isolierstoffpfropfen am stirnseitigen Ende des Mantelrohres einzupressen. Hierbei mag zwar eine mechanische Halterung des Isolierstoffpfropfens am Mantelrohr erzielt werden, jedoch ist die Halterung des Anschlußbolzens im Isolierstoffpfropfen nicht ausreichend, zumal zwischen dem Anschlußbolzen und der Innenbohrung des Isolierstoffpfropfens das Entweichen von Restfeuchtigkeit im Inneren des Rohrheizkörpers gewährleistet sein soll.For this purpose, it is known from DE-A-1 615 424 to provide a viscous sealing compound between the insulating material in which the heating coil is embedded and the insulating plug provided at the connection end, through which the connecting bolt is passed, which expels when the tubular heater is heat-treated any residual moisture that is still present is allowed and then assumes a viscous or gelatinous consistency towards the end of the heat treatment. In this known tubular heater, an additional sealing compound is necessary. From DE-A-2 531 529 it is known for the end seal of an electric tubular heater, while omitting such an additional sealing compound, to press in the plug of insulating material provided for the end seal at the front end of the casing tube. Although mechanical retention of the insulating plug on the tubular casing may be achieved, the holding of the connecting bolt in the insulating plug is not sufficient, especially since the escape of residual moisture inside the tubular heating element should be ensured between the connecting bolt and the inner bore of the insulating plug.
Zur Befestigung des Anschlußbolzens in der Isolierperle sind relativ aufwendige Befestigungsmittel in Form von Schrauben aus der FR-A-803 095 und der US-A-2 046 102 bekannt, wobei zur mechanischen Befestigung der Isolierperle im Mantelrohr aus der US-PS 2 046 102 noch zusätzliche Haltemittel, die in umlaufende Nuten an der Innenwand des Mantelrohres eingreifen, vorgesehen sind. Auch die aus der FR-PS 803 095 bekannten, an der Mantelrohrinnenseite vorgesehenen Vorsprünge, welche in umlaufende Nuten der Isolierperle eingreifen, um diese mechanisch festzulegen, erschweren den Einbau der Isolierperle bei der Endenabdichtung des Rohrheizkörpers. Zudem werden dabei noch zusätzliche Dichtungsringe benötigt, um zwischen der Isolierperle und dem Mantelrohr eine ausreichende Abdichtung zu erzielen.Relatively complex fastening means in the form of screws are known from FR-A-803 095 and US Pat. No. 2,046,102 for fastening the connecting bolt in the insulating bead, with US Pat. No. 2,046,102 for mechanical fastening of the insulating bead in the casing tube additional holding means which engage in circumferential grooves on the inner wall of the casing tube are provided. The projections known from FR-PS 803 095, which are provided on the inside of the tubular casing and which engage in circumferential grooves of the insulating bead in order to fix them mechanically, complicate the installation of the insulating bead in the end sealing of the tubular heating element. In addition, additional sealing rings are required in order to achieve an adequate seal between the insulating bead and the casing tube.
Aufgabe der Erfindung ist es demgegenüber, einen Rohrheizkörper der eingangs genannten Art zu schaffen, bei dem trotz der Möglichkeit des Entweichens von im Mantelrohr befindlicher Restfeuchtigkeit eine mechanische Halterung der Isolierperle gegenüber dem Mantelrohr und eine mechanische Befestigung des Anschlußbolzens in der Isolierperle mit einfachen Mitteln, ohne zusätzliche Befestigungselemente, erreicht wird.In contrast, the object of the invention is to provide a tubular heater of the type mentioned, in which, despite the possibility of escape of residual moisture present in the jacket tube, a mechanical mounting of the insulating bead relative to the jacket tube and a mechanical attachment of the connecting bolt in the insulating bead with simple means, without additional fasteners is achieved.
Diese Aufgabe wird gelöst durch die Kombination der Merkmale, daß
- - die lsolierperle im Durchmesser abgestuft ausgebildet ist und der den größeren Durchmesser aufweisende Teil der Isolierperle zwischen zwei Einschnürungen bzw. Einquetschungen des Mantelrohres eingepreßt ist,
- - am aus der Isolierperle ragenden Teil des Anschlußbolzens eine Abdrückung vorgesehen ist durch die die Isolierperle in Richtung zur Rohrheizkörperinnenseite gepreßt ist,
- - das Isoliermaterial in bekannter Weise mit Silikonöl oder dergleichen getränkt ist.
- the insulating bead is graduated in diameter and the part of the insulating bead which has the larger diameter is pressed between two constrictions or pinches of the casing tube,
- a depression is provided on the part of the connecting bolt protruding from the insulating bead, by means of which the insulating bead is pressed in the direction of the inside of the tubular heating element,
- - The insulating material is soaked in a known manner with silicone oil or the like.
In vorteilhafter Weise kann zwischen die Abdrückung und die Isolierperle ein Sicherungsring gelegt sein.A securing ring can advantageously be placed between the impression and the insulating bead.
Die mit der Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß der Rohrheizkörper einerseits infolge der mechanischen Halterung eine sehr hohe Temperaturbeständigkeit von etwa 600°C aufweist und andererseits keiner Beeinträchtigung seiner lsolationswirkung durch Feuchtigkeit mehr ausgesetzt ist. Zudem kommt hinzu, daß die Herstellung - da ja kein Einkleben bzw. Eingießen einer Endenabdichtung mehr erforderlich ist - äußerst einfach durchführbar ist.The advantages that can be achieved with the invention are, in particular, that the tubular heating element, on the one hand, has a very high temperature resistance of about 600 ° C. due to the mechanical holder and, on the other hand, is no longer exposed to its insulation effect due to moisture. In addition, the production - since there is no longer any need to glue or pour in an end seal - is extremely simple to carry out.
Die Erfindung wird im folgenden anhand der Zeichnungen näher erläutert. Es zeigt
- Fig. 1 ein Ausführungsbeispiel eines Rohrheizkörperendenabschlusses, wobei die Isolierperle einen runden Querschnitt aufweist und
- Fig. 2 das Ausführungsbeispiel gemäß Fig. 1, wobei jedoch die Isolierperle einen dreieckförmigen Querschnitt aufweist.
- Fig. 1 shows an embodiment of a tubular heater body end closure, the insulating bead has a round cross section and
- Fig. 2 shows the embodiment of FIG. 1, but the insulating bead has a triangular cross-section.
Wie in Fig. 1 dargestellt, weist ein elektrischer Rohrheizkörper ein Mantelrohr 1 auf, in dem sich eine in Siliconöl durchtränktem Isoliermaterial 2 eingebettete Heizwendel 3 befindet. An dem Ende der Heizwendel 3 ist ein Anschlußbolzen 4 vorgesehen, der mit einer nicht gezeigten elektrischen Stromquelle verbunden werden kann. Der Anschlußbolzen 4 weist zudem einen Teil mit größerem Durchmesser und einen Teil mit kleinerem Durchmesser auf. Der Bolzenteil mit größerem Durchmesser ist im Isoliermaterial 2 eingebettet und mit der Heizwendel 3 elektrisch verbunden, während der sich anschließende Bolzenteil mit kleinem Durchmesser ein Stück im Mantelrohr 1 verläuft und anschließend aus dem Rohrheizkörper zur Verbindung mit einer Stromquelle herausragt. Der Querschnittsprung des Anschlußbolzens 4 liegt somit in einer Ebene mit dem Isoliermaterialabschluß.As shown in FIG. 1, an electric tubular heater has a jacket tube 1, in which there is a heating coil 3 embedded in insulating
Um eine Isolierung des Anschlußbolzens 4 gegenüber dem Mantelrohr 2 zu gewährleisten, ist über dem Bolzenteil mit kleinem Durchmesser zum Teil eine Isolierperle 5 mit einem entsprechenden Durchgangsloch bis zum Querschnittsprung des Anschlußbolzens 4 aufgeschoben. Die im Durchmesser abgestufte Isolierperle 5 weist auf der dem Isoliermaterial 2 zugekehrten Seite etwa gleichen Außendurchmesser wie das Isoliermaterial auf. Weiterhin ist ein Sicherungsring 6 im Anschluß an die Isolierperle auf den Anschlußbolzen 4 aufgeschoben. Um ein Verschieben der Isolierperle 5 zu verhindern, ist bei fest aufgeschobener Isolierperle 5 in Nähe des Sicherungsringes 6 der Anschlußbolzen 4 abgedrückt. Demzufolge wird der Sicherungsring 6 in Richtung der Rohrheizkörperinnenseite und somit die Isolierperle gegen das Isoliermaterial gepreßt.In order to ensure insulation of the connecting bolt 4 with respect to the
Damit der Anschlußbolzen 4 insgesamt eine gewisse Festigkeit gegenüber dem Mantelrohr 1 erlangt, ist der einen größeren Durchmesser aufweisende Teil der Isolierperle 5 zwischen zwei Einschnürungen bzw. Einquetschungen des Mantelrohres eingepreßt. Da durch Verwendung eines siliconöldurchtränkten Isoliermaterials 2 eine mechanische Halterung 7 der Isolierperle ausreichend ist, kann jederzeit eine im Mantelrohr befindliche Restfeuchtigkeit nach außen entweichen.So that the connecting bolt 4 attains a certain strength with respect to the jacket tube 1, the larger diameter part of the insulating
Das in Fig. 2 dargestellte Ausführungsbeispiel unterscheidet sich von dem obenerwähnten nur insoweit, daß anstelle einer Rundperle 5 eine Dreieckperle 8 Anwendung findet.The embodiment shown in Fig. 2 differs from the above only in that a
Claims (2)
characterised by the combination of features that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT79103944T ATE82T1 (en) | 1978-10-13 | 1979-10-12 | TUBULAR HEATING ELEMENT. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2844714 | 1978-10-13 | ||
| DE19782844714 DE2844714A1 (en) | 1978-10-13 | 1978-10-13 | END SEAL FOR AN ELECTRIC PIPE RADIATOR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0010275A1 EP0010275A1 (en) | 1980-04-30 |
| EP0010275B1 true EP0010275B1 (en) | 1981-06-10 |
Family
ID=6052145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79103944A Expired EP0010275B1 (en) | 1978-10-13 | 1979-10-12 | Tubular heating element |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0010275B1 (en) |
| AT (1) | ATE82T1 (en) |
| DE (2) | DE7830574U1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3204875C2 (en) * | 1982-02-12 | 1985-02-07 | Elpag Ag Chur, Chur | Tubular heater with an overload protection |
| EP0157182B1 (en) * | 1984-03-01 | 1989-01-04 | Elpag Ag Chur | Tubular heating body |
| DE8910145U1 (en) * | 1989-08-24 | 1989-10-05 | Fritz Eichenauer GmbH & Co. KG Fabrik elektr. Spezialartikel, 6744 Kandel | Electric tubular heater connection for two separate heating outputs |
| IT1294562B1 (en) * | 1997-02-07 | 1999-04-12 | I R C A Spa Ind Resistenze Cor | ARMORED RESISTANCE AND RESISTANCE OBTAINED PROCEDURE. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2046102A (en) * | 1931-07-30 | 1936-06-30 | Gen Electric | Electric terminal connection |
| FR803095A (en) * | 1935-09-20 | 1936-09-22 | Improvements to electrothermal devices | |
| DE1615424B2 (en) * | 1967-12-19 | 1973-02-15 | Siemens Electrogerate GmbH, 1000 Berlin u 8000 München | ELECTRIC TUBE RADIATOR |
| DE2410451A1 (en) * | 1974-03-05 | 1975-09-11 | Eichenauer Fa Fritz | Damp-proof seal for tubular, electric, heating elements - has a tubular plastic stopper and a dielectric barrier liq. |
| DE2531529C2 (en) * | 1975-07-15 | 1985-05-02 | Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden | Electric tubular heater |
-
1978
- 1978-10-13 DE DE19787830574U patent/DE7830574U1/en not_active Expired
- 1978-10-13 DE DE19782844714 patent/DE2844714A1/en not_active Withdrawn
-
1979
- 1979-10-12 EP EP79103944A patent/EP0010275B1/en not_active Expired
- 1979-10-12 AT AT79103944T patent/ATE82T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2844714A1 (en) | 1980-04-24 |
| EP0010275A1 (en) | 1980-04-30 |
| DE7830574U1 (en) | 1983-07-28 |
| ATE82T1 (en) | 1981-06-15 |
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