DE3206508C2 - Process for the production of an electrical ceramic fiber surface heating element - Google Patents
Process for the production of an electrical ceramic fiber surface heating elementInfo
- Publication number
- DE3206508C2 DE3206508C2 DE19823206508 DE3206508A DE3206508C2 DE 3206508 C2 DE3206508 C2 DE 3206508C2 DE 19823206508 DE19823206508 DE 19823206508 DE 3206508 A DE3206508 A DE 3206508A DE 3206508 C2 DE3206508 C2 DE 3206508C2
- Authority
- DE
- Germany
- Prior art keywords
- ceramic fiber
- insulating body
- heating
- fiber insulating
- coil
- 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
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
- H05B3/62—Heating elements specially adapted for furnaces
- H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
-
- 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
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
- H05B3/283—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an inorganic material, e.g. ceramic
Abstract
Um einen Keramikfaser-Isolierkörper mit mindestens einer in den Isolierkörper so eingebetteten elektrischen Heizleiterwendel, daß sich die Wendel zur Wärmeabstrahlseite des Isolier-Körpers parallel erstreckt und die auseinandergezogenen Windungen bis an die Wärmeabstrahlseite des Isolierkörpers heranreichen, dahingehend zu verbessern, daß mit einfachen und preiswerten Mitteln und Maßnahmen geringere Ausheizungszeiten, eine Erhöhung des Wirkungsgrades und eine Verlängerng der Lebensdauer erreichbar sind, ist der von der Heizleiterwendel (2) umgrenzte Raum (6) von Isolierkörperwerkstoffen frei und zur Wärmeabstrahlseite (3) des Isolierkörpers (1) hin offen ausgebildet.In order to improve a ceramic fiber insulating body with at least one electrical heating conductor coil embedded in the insulating body in such a way that the coil extends parallel to the heat radiation side of the insulating body and the pulled apart turns reach up to the heat radiation side of the insulating body to the effect that with simple and inexpensive means and measures shorter bakeout times, an increase in efficiency and a lengthening of the service life can be achieved, the space (6) bounded by the heating conductor coil (2) is free of insulating body materials and designed to be open to the heat radiation side (3) of the insulating body (1).
Description
Die Erfindung geht aus von einem Verfahren zur Herstellung eines elektrischen Keramikfaser-Flächenheizelementes der im Oberbegriff des Patentanspruches angegebenen und durch die GB-PS 14 41 577 bekannt gewordenen Art.The invention is based on a method for producing an electrical ceramic fiber surface heating element the one specified in the preamble of the claim and made known by GB-PS 14 41 577 Art.
Gemäß des aus der GB-PS 14 41 577 bekannten Verfahrens wird die Heizleiterwendel auf ein Plastikrohr kreisförmigen Querschnittes aufgewickelt. Ferner wird auf letztere, und zwar an der der Wärmeabstrahlseite abgewandten Seite Wachs aufgebracht und während der Trocknung des Keramikfaser-Isolierkörpers soll das Plastikrohr und das Wachs ausgeschmolzen werden.According to the method known from GB-PS 14 41 577, the heating conductor coil is placed on a plastic tube wound circular cross-section. Furthermore, on the latter, namely on the heat radiation side remote side wax is applied and while the ceramic fiber insulating body is drying, the Plastic tube and the wax are melted out.
Hierzu ist es aber erforderlich zuvor im Keramikfaser-Isolierkörper Auslauföffnungen anzuordnen, damit die Schmelze auch aus dem Keramikfaser-Isolierkörper auslaufen kann.For this, however, it is necessary beforehand in the ceramic fiber insulating body Arrange outlet openings so that the melt also out of the ceramic fiber insulating body can leak.
Ferner muß zum Schmelzen der Plastikrohre der gesamte Keramikfaser-Isolierkörper auf etwa 800° C erwärmt werden.Furthermore, the entire ceramic fiber insulating body must be heated to about 800 ° C. in order to melt the plastic pipes will.
Bei alledem besteht noch die Gefahr, daß Plastikrohrreste im Isolierkörper dennoch verbleiben und dann die Ofenatmosphäre negativ beeinflussen.With all of this there is still the risk of plastic pipe remains still remain in the insulating body and then negatively affect the furnace atmosphere.
Aufgabe der Erfindung ist es nun ein Verfahren zur Herstellung eines elektrischen Keramikfaser-Flächenheizelementes der im Oberbegriff des Anspruches angegebenen Art derart zu verbessern, daß eine wesentliche Vereinfachung der Herstellung erreichbar ist, die auch eine Verminderung des Wärmeaufwandes zum Schmelzen der verlorenen Formkörper ergibt.The object of the invention is now a method for producing an electrical ceramic fiber surface heating element to improve the type specified in the preamble of claim so that an essential Simplification of the production can be achieved, which also reduces the amount of heat required for melting the lost mold results.
Die Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß die Heizleiterwendel so in einen Formkörper aus Eis oder gefrorener Keramikfaser-Schlämme eingegossen wird, daß der durch die Heizwendelmantelfläche begrenzte Innenraum ausgefüllt und zusätzlich an einem Umfangsabschnitt der Heizwendelmantelfläche eine ebene, tangential^ in Richtung der Heizwendelachse verlaufende Fläche gebildet wird, die schmäler ist als der Außendurchmesser der Heizweadel und daß dieser-Formkörper so in den Keramikfaser-Isolierkörper eingebettet wird, daß diese tangentiale Fläche in der Oberflächenebene der Wärmeabstrahlseite des Keramikfaser-Isolierkörpers liegtThe solution to this problem is characterized by that the heating conductor coil is poured into a molded body made of ice or frozen ceramic fiber slurry is that the space bounded by the heating coil surface is filled and in addition to one Circumferential section of the heating coil jacket surface is a flat, tangential ^ in the direction of the heating coil axis running surface is formed which is narrower than the outer diameter of the Heizweadel and that this shaped body is embedded in the ceramic fiber insulating body so that this tangential surface is in the surface plane the heat radiation side of the ceramic fiber insulating body
Durch diese Maßnahmen werden die Auslauföffnungen für die Schmelze nunmehr durch die Formkörper zwangsläufig gebildet und zwar in der Wärmeabstrahlseite des Keramikfaser-Isolierkörpers und den Heizleiterwendeln jeweils gegenüber, woraus auch eine Wirkungsgraderhöhung und eine höhere Lebensdauer der elektrischen Heizleiterwendel resultiertAs a result of these measures, the outlet openings for the melt are now through the shaped bodies inevitably formed in the heat radiation side of the ceramic fiber insulating body and the heating conductor coils in each case opposite, which also results in an increase in efficiency and a longer service life of the electrical heating conductor coil results
Zudem vermag schon die normale Temperatur der Atmosphäre oberhalb des Gefrierpunktes ausreichen, um die aus Eis oder gefrorener Keramikfaser-Schlämme bestehenden, verlorenen Formkörper zu schmelzen und rückstandsöle}* zu entfernen, woraus sich eine wei—JM. tere erhebliche Verbilligung der Herstellung ergibtIn addition, even the normal temperature of the atmosphere above freezing point can be sufficient to melt the lost moldings consisting of ice or frozen ceramic fiber slurry and to remove residual oils, resulting in a white color . tere results in considerable cheaper production
Die Erfindung wird im folgenden anhand eines in der Zeichnung dargestellten Ausführungsbeispieles erläutert The invention is explained below with reference to an embodiment shown in the drawing
Es zeigtIt shows
F i g. 1 einen Teil eines Keramikfaser-Isolitrkörpers von der Wärmyabstrahlseite her gesehen,
F i g. 2 desgleichen in Richtung der Linie H-II gesehen, F i g. 1 a part of a ceramic fiber insulating body seen from the heat radiation side,
F i g. 2 also seen in the direction of the line H-II,
F i g. 3 desgleichen wie in F i g. 2 gesehen jedoch ohne Formkörper.F i g. 3 the same as in FIG. 2 seen, however, without a shaped body.
In den mittels eines unterdruckgesteuerten Filterprozesses hergestellten Keramikfaser-Isolierkörper ist eine elektrische Heizleiterwendel 2 so eingebettet, daß deren Windungen mit der Wärmeabstrahlseite 3 des Keramikfaser-Isolierkörpers 1 tangieren.In the ceramic fiber insulating body produced by means of a vacuum-controlled filter process there is a electrical heating coil 2 embedded so that its turns with the heat radiation side 3 of the ceramic fiber insulating body 1 tangent.
Gemäß den F i g. 1 und 2 ist vor dem Formen des Keramikfaser-Isolierkörpers in die Heizleiterwendel 3 ein den von ihr umgrenzten Raum ausfüllender, verlorener Formkern 4 aus tief gefrorenem Wasser eingefügt worden.According to FIGS. 1 and 2 is prior to the molding of the ceramic fiber insulating body into the heating conductor coil 3 a lost mold core 4 made of deep-frozen water and filling the space bounded by it is inserted been.
Der Formkern 4 besitzt zur Wärmeabstrahlseite 3 hin vorstehende mit letzterer bündig abschließende Vor-Sprünge
5, deren Breite kleiner als der Außendurchmesser der Heizleiterwendel 2 ist, so daß letztere über ihren
Umfang um mehr als 180" vom Keramikfaser-Isolierkörper umfaßt ist.
Nach dem Auftauen des Formkernes 4 und Abfließen des Wassers ergibt sich demzufolge im Keramikfaser-Isolierkörper
1 ein von der Heizleiterwendel 2 umgrenzter und zur Wärmeabstrahlseite 3 hin ausmündender,
freier Raum 6, wie dieser aus der F i g. 3 ersichtlich ist.The mold core 4 has protruding with the latter flush with the latter protruding protrusions 5, the width of which is smaller than the outer diameter of the heating coil 2, so that the latter is encompassed by more than 180 "of the ceramic fiber insulating body over its circumference.
After the mold core 4 has thawed and the water has drained off, there is consequently a free space 6 in the ceramic fiber insulating body 1, delimited by the heating conductor coil 2 and opening out to the heat radiation side 3, as shown in FIG. 3 can be seen.
Die Windungen der Heizleiterwendel 2 können kreisförmig, oval oder vieleckig ausgebildet sein.The turns of the heating conductor coil 2 can be circular, oval or polygonal.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (1)
während der Trocknung des Keramikfaser-Isolierkörpers ausgeschmolzen wird,the mold core is embedded in a ceramic fiber insulating body by means of a vacuum-controlled filter process and
is melted out during the drying of the ceramic fiber insulating body,
dieser Formkörper so in den Keramikfaser-Isolierkörper eingebettet wird, daß diese tangentiale Fläche in der Oberflächenebene der Wärmeabstrahlseite des Keramikfaser-Isolierkörpers liegt.In addition, on a circumferential section of the heating coil jacket surface, a flat, tangentia-Ie surface running in the direction of the heating coil axis is formed, which is narrower than the outer diameter of the heating coil and that
this shaped body is embedded in the ceramic fiber insulating body in such a way that this tangential surface lies in the surface plane of the heat radiation side of the ceramic fiber insulating body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823206508 DE3206508C2 (en) | 1982-02-24 | 1982-02-24 | Process for the production of an electrical ceramic fiber surface heating element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823206508 DE3206508C2 (en) | 1982-02-24 | 1982-02-24 | Process for the production of an electrical ceramic fiber surface heating element |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3206508A1 DE3206508A1 (en) | 1983-09-08 |
DE3206508C2 true DE3206508C2 (en) | 1986-02-27 |
Family
ID=6156504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19823206508 Expired DE3206508C2 (en) | 1982-02-24 | 1982-02-24 | Process for the production of an electrical ceramic fiber surface heating element |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3206508C2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3828192A1 (en) * | 1988-08-19 | 1990-02-22 | Ego Elektro Blanc & Fischer | RADIANT RADIATOR AND METHOD AND DEVICE FOR PRODUCING IT |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3233181C2 (en) * | 1982-09-07 | 1985-08-01 | Bulten-Kanthal GmbH, 6082 Mörfelden-Walldorf | Vacuum-formed, electric, radiant resistance heating device for industrial furnaces and processes for their production, made from ceramic fibers. |
GB2192119A (en) * | 1986-06-20 | 1987-12-31 | Kanthal Ltd | Heating devices |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1441577A (en) * | 1972-09-02 | 1976-07-07 | Docx A G | Muffle furnaces |
CA1115761A (en) * | 1977-12-21 | 1982-01-05 | Ewald R. Werych | Electrical heating unit with flattened embedded heating coil |
-
1982
- 1982-02-24 DE DE19823206508 patent/DE3206508C2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3828192A1 (en) * | 1988-08-19 | 1990-02-22 | Ego Elektro Blanc & Fischer | RADIANT RADIATOR AND METHOD AND DEVICE FOR PRODUCING IT |
Also Published As
Publication number | Publication date |
---|---|
DE3206508A1 (en) | 1983-09-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: KERFA GMBH INDUSTRIEBEHEIZUNGEN, 5820 GEVELSBERG, |
|
D2 | Grant after examination | ||
8363 | Opposition against the patent | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: ABICHT, ROLAND, ING.(GRAD.), 5828 ENNEPETAL, DE |
|
8365 | Fully valid after opposition proceedings | ||
8380 | Miscellaneous part iii |
Free format text: SPALTE 2, ZEILE 21 "RUECKSTANDSREICH" AENDERN IN "RUECKSTANDSFREI" |