EP0105175A1 - Dispositif de chauffage électrique moulé sous vide et son procédé de fabrication - Google Patents

Dispositif de chauffage électrique moulé sous vide et son procédé de fabrication Download PDF

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Publication number
EP0105175A1
EP0105175A1 EP83108349A EP83108349A EP0105175A1 EP 0105175 A1 EP0105175 A1 EP 0105175A1 EP 83108349 A EP83108349 A EP 83108349A EP 83108349 A EP83108349 A EP 83108349A EP 0105175 A1 EP0105175 A1 EP 0105175A1
Authority
EP
European Patent Office
Prior art keywords
heating coil
heating
sieve
vacuum molding
fiber
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.)
Granted
Application number
EP83108349A
Other languages
German (de)
English (en)
Other versions
EP0105175B1 (fr
EP0105175B2 (fr
Inventor
Josef Bös
Leo Saris
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.)
Kanthal GmbH
Original Assignee
Kanthal GmbH
Bulten Kanthal 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6172636&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0105175(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kanthal GmbH, Bulten Kanthal GmbH filed Critical Kanthal GmbH
Priority to AT83108349T priority Critical patent/ATE32157T1/de
Publication of EP0105175A1 publication Critical patent/EP0105175A1/fr
Publication of EP0105175B1 publication Critical patent/EP0105175B1/fr
Application granted granted Critical
Publication of EP0105175B2 publication Critical patent/EP0105175B2/fr
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
    • H05B3/20—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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49083—Heater type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing

Definitions

  • the invention relates to a vacuum-shaped electrical heating device according to the preamble of claim 1, in which a resistance heating coil is embedded in an insulating body made of ceramic fiber material so that a surface area of the heating coil is exposed on the radiant heating surface.
  • a heating device is also referred to as a heating module.
  • the invention also relates primarily to a vacuum molding process for making such an electrical heater.
  • heating modules The basic technique for vacuum forming electrical heating devices referred to here as "heating modules" is described, for example, in US Pat. No. 3,500,444 and in a more modern form in US Pat. No. 4,278,877.
  • heating modules produced according to these vacuum molding processes the heating coils or heating spirals are embedded in the ceramic fiber mass in such a way that the interior of the heating spirals is normally filled with fiber material.
  • the interior 8 of the heating coil 5 is generally also filled with ceramic fibers, specifically the density in this interior 8 will correspond approximately to the density of the remaining mass of the ceramic fiber block 4, which is approximately 200 kgfm 3 .
  • the invention is therefore based on the object to provide heating modules of the type mentioned and a vacuum molding process for their production, by which it is achieved that the heating coil in its anchoring in the aluminum silicate fiber mass does not loosen or dissolve even when the heating coil on an optimal operating temperature is heated such that a temperature of 1150 ° C. occurs on the radiating side of the module, for example.
  • a heating module according to the invention has the features specified in claim 1.
  • a vacuum molding process for producing such a heating module is the subject of claim 2.
  • the invention ensures that the interior of the heating coil remains more or less free of fiber material, so that the temperature difference on the heating coil between the radiating surface of the heating module and the rear is significantly reduced and the heating coil can be operated at a significantly higher operating temperature overall without the risk of a gradual loosening from the anchorage within the Fiber blocks exist.
  • the support elements or the impermeable areas of the sieve bottom are narrower than the width dimensions of the heating spirals in a plane parallel to the radiating surface or narrower than the diameter of the heating spirals, it is achieved that the heating spirals remain largely free in their interior of fiber material, since the openings of the sieve-like bottom in the longitudinal extension of the heating spirals can be seen partially closed during the vacuum molding process or are not present in these areas.
  • the heating coils are underlaid during the vacuum molding process by strip-like elements, hereinafter referred to as "spacer strips”, so that for reasons explained below, the heating coils are later exposed on the radiating surface of the heating module, but overall are set back into the fiber block by the thickness of the spacer strips, so that optimal anchoring is achieved, but at the same time the interior of the heating spirals remains free of fiber material.
  • FIG 3 illustrates a first embodiment: on the sieve-like base 1 (the perforated plate), for example, adhesive strips 10 are applied, which cover the perforation in the longitudinal extent of the heating spirals 5, that is to say in the direction perpendicular to the plane of the drawing. These adhesive strips 10 are attached directly under the heating spirals 5 which are subsequently placed on the perforated plate and are slightly fixed. The partial closure of the perforation does not result in a suction effect caused by the vacuum 2 at these points, so that the interior 8 of the heating spirals 5 remains largely free of ceramic fiber material.
  • FIG. 4 shows the result of the manufacturing method explained with reference to FIG. 3. Similar to the exemplary embodiment in FIG. 2, the heating coil 5 is also flush with the radiating side 9 of the fiber block 4. The interior 8 of the heating coil 5 is now hollow, that is to say free of fiber material, so that the rear side 7 of the heating coil 5 radiates much more freely can. It is thus achieved that the temperature difference on the heating coil between the free-radiating side 6 on the radiating surface 9 and the rear 7 is greatly reduced is, so that undesired overheating in the area of the rear 7 of the heating spirals 5 is avoided.
  • this first principle embodiment of the invention still has the disadvantage that the heating coil 5 is now less overall connected to the ceramic fiber block 4, although the above-explained effect of recrystallization of the fibers due to partial overheating is no longer observed.
  • the heating coils 5 are only surrounded by fiber material along their outer circumference and, moreover, they are not held on the free-radiating side 6, as is also the case in the prior art according to FIG. 2.
  • the principle advantage that the crystallization of the fiber material no longer occurs a difficulty can also arise with this construction, however, in that the heating spirals fall out of the fiber block because of inadequate anchoring, especially when such heating modules are used for ceiling constructions in furnace rooms.
  • the much improved embodiment of the invention according to FIGS. 5 and 6 is based on the idea of embedding the heating coil 5 on the one hand in the mass of the fiber block 4 in such a way that its interior 8 remains free of ceramic fibers without, on the other hand, the risk that the Heating coils 5 can fall out of the fiber block 4 due to poor adhesion.
  • spacer strips 11 are attached to the sieve-like base 1 below the intended positions of the heating spirals.
  • These spacer strips 11 can e.g. made of metal, wood or plastic.
  • the width of these spacer strips 11 should in any case be somewhat less than the diameter or the width dimension of the heating coil 5 in a plane parallel to the radiating surface side 9 of the fiber block 4; the thickness of the spacer strips 11 should be in the range of at least 0.1 to approximately 30 mm, preferably in the range of 2 to 10 mm.
  • the silt 3 is now introduced into the frame (not shown in more detail) equipped with the sieve-like base 1 and the liquid portion is drawn off through the sieve-like base 1, the fibers build up in such a way that the spacer strips 11 are enclosed, while the interior 4 of the heating coils 5 largely hollow, ie remains free of fiber deposits.
  • the free-radiating side 6 of the heating coil 5 is no longer flush with the radiating side 9 of the fiber block 4, but is set back into the fiber block 4 by the thickness of the spacer strips 11.
  • the resulting on the spacers 11 retaining webs 12 partially enclose the exposed side 6 of the heating spirals 5, but without the interior 8 is filled with fibers.
  • the desired goal was achieved, namely to keep the interior fiber-free, so that the temperature difference between the radiating side 6 and the rear 7 of the heating coils 5 is significantly less than in the conventional technology, in which the heating coil len completely, ie with fiber-filled interior 8 are embedded in the fiber block 4.
  • the heating spirals 5 are held securely by the holding webs 12, so that there is no longer any danger of falling out, even if such a heating module is used as a ceiling element in an oven.
EP83108349A 1982-09-07 1983-08-24 Dispositif de chauffage électrique moulé sous vide et son procédé de fabrication Expired - Lifetime EP0105175B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83108349T ATE32157T1 (de) 1982-09-07 1983-08-24 Vakuumgeformte elektrische heizvorrichtung und verfahren zu deren herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3233181 1982-09-07
DE3233181A DE3233181C2 (de) 1982-09-07 1982-09-07 Aus keramischen Fasern vakuumgeformte, elektrische, freistrahlende Widerstands-Heizvorrichtung für Industrieöfen und Verfahren zu deren Herstellung.

Publications (3)

Publication Number Publication Date
EP0105175A1 true EP0105175A1 (fr) 1984-04-11
EP0105175B1 EP0105175B1 (fr) 1988-01-20
EP0105175B2 EP0105175B2 (fr) 1993-06-23

Family

ID=6172636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108349A Expired - Lifetime EP0105175B2 (fr) 1982-09-07 1983-08-24 Dispositif de chauffage électrique moulé sous vide et son procédé de fabrication

Country Status (7)

Country Link
US (1) US4617450A (fr)
EP (1) EP0105175B2 (fr)
JP (1) JPS5966094A (fr)
AT (1) ATE32157T1 (fr)
CA (1) CA1213635A (fr)
DE (1) DE3233181C2 (fr)
MX (1) MX153420A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0250231A1 (fr) * 1986-06-20 1987-12-23 Kanthal Limited Dispositifs de chauffage
DE3932854A1 (de) * 1988-10-05 1990-04-12 Rudolf Wille Vorgefertigtes wandteil zur herstellung von waermekammern nach art eines tepidariums sowie ein daraus hergestelltes tepidarium
EP0697185A1 (fr) * 1994-08-18 1996-02-21 Middleby Marshall Inc. Gril pour la restauration construit d'une façon modulaire et sensible à la charge

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4575619A (en) * 1984-05-08 1986-03-11 General Signal Corporation Electrical heating unit with serpentine heating element
JPS6116488A (ja) * 1984-06-30 1986-01-24 イビデン株式会社 断熱ヒ−タ−
DE3539881A1 (de) * 1985-11-11 1987-05-14 Ego Elektro Blanc & Fischer Elektrischer strahlheizkoerper zur beheizung von heizflaechen sowie verfahren und vorrichtung zu seiner herstellung
US4855576A (en) * 1986-05-30 1989-08-08 General Signal Corporation Thermal insulating blocks and utilizing single blocks for electrical heating units
US4719336A (en) * 1986-05-30 1988-01-12 General Signal Corporation Method of making thermal insulating blocks and electrical heating units and the products thereof
DE69015114D1 (de) * 1989-10-24 1995-01-26 Gen Signal Corp Ofen und Heizeinheit für diesen Ofen.
US5708251A (en) * 1995-10-30 1998-01-13 Compucraft Ltd. Method for embedding resistance heating wire in an electrofusion saddle coupler
US5847368A (en) * 1996-06-20 1998-12-08 Koyo Lindberg Limited Electric heating unit and method of producing same
KR101763963B1 (ko) * 2009-11-05 2017-08-14 윈스톤 월보즈 리미티드 난방 패널 및 그 제조 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500444A (en) * 1968-01-16 1970-03-10 Johns Manville Electrical heating unit with an insulating refractory support
DE2500586A1 (de) * 1975-01-09 1976-07-15 Ego Elektro Blanc & Fischer Elektrokochgeraet
GB2061679A (en) * 1979-10-27 1981-05-13 Ego Elektro Blanc & Fischer Heating element for a glass ceramic cooking unit
US4278877A (en) * 1977-12-21 1981-07-14 General Signal Corporation Electrical heating unit with flattened embedded heating coil

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US1317883A (en) * 1919-10-07 Method of generating radiant energy and projecting same through free
US2255518A (en) * 1938-11-15 1941-09-09 Babcock & Wilcox Co Electric furnace
US2254925A (en) * 1939-03-30 1941-09-02 Louis E Wirth Paint disintegrator
US2489190A (en) * 1945-07-13 1949-11-22 Procedes Sauter Electric heating element
US2674775A (en) * 1946-07-03 1954-04-13 Corwin D Willson Making molded panels
US2744946A (en) * 1953-11-25 1956-05-08 L & L Mfg Company Electric furnace and heating unit therefor
DE1024181B (de) * 1955-12-30 1958-02-13 Kanthal Ab Elektrisches Heizgeraet
US3275497A (en) * 1962-01-17 1966-09-27 American Thermocatalytic Corp Method of molding a combustion element of ceramic fibers on a porous support
GB1136811A (en) * 1965-09-14 1968-12-18 Foseco Trading Ag Production of heat insulating products
US3952408A (en) * 1970-03-26 1976-04-27 Albert George Docx Method of assembling a resistance furnace
DE2051048C3 (de) * 1970-10-17 1980-10-09 Glaswerk Schuller Gmbh, 6980 Wertheim Siebpartie einer Maschine zum Herstellen einer Faserbahn
DE2156361A1 (de) * 1971-11-12 1973-05-17 Siemens Ag Verfahren zur herstellung von keramischen traegerkoerpern fuer kappenlose elektrische widerstaende
GB1441577A (en) * 1972-09-02 1976-07-07 Docx A G Muffle furnaces
US3870861A (en) * 1974-03-07 1975-03-11 Sola Basic Ind Inc Electric hot plate heating unit with a ceramic cover
US3978183A (en) * 1974-06-24 1976-08-31 Sybron Corporation Method of filter molding and electrical heating unit made thereby
FR2301148A1 (fr) * 1975-02-11 1976-09-10 Physique Appliquee Ind Element chauffant electrique monobloc et son procede de preparation
US4272670A (en) * 1976-05-01 1981-06-09 Docx Albert G Furnace muffles and furnaces
US4091355A (en) * 1977-01-19 1978-05-23 Btu Engineering Corporation Anchored coil heater
CA1115761A (fr) * 1977-12-21 1982-01-05 Ewald R. Werych Element chauffant a serpentin plat encastre
US4247979A (en) * 1979-03-08 1981-02-03 Eck Richard H Radiant heater and method of making same
JPS5678088A (en) * 1979-11-30 1981-06-26 Riken Kk Method of manufacturing heater burying refractory formed article
DE2950302A1 (de) * 1979-12-14 1981-06-19 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer strahlheizkoerper sowie verfahren und vorrichtung zu seiner herstellung
DE3206508C2 (de) * 1982-02-24 1986-02-27 KERFA GmbH Industriebeheizungen, 5820 Gevelsberg Verfahren zur Herstellung eines elektrischen Keramikfaser-Flächenheizelementes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500444A (en) * 1968-01-16 1970-03-10 Johns Manville Electrical heating unit with an insulating refractory support
DE2500586A1 (de) * 1975-01-09 1976-07-15 Ego Elektro Blanc & Fischer Elektrokochgeraet
US4278877A (en) * 1977-12-21 1981-07-14 General Signal Corporation Electrical heating unit with flattened embedded heating coil
GB2061679A (en) * 1979-10-27 1981-05-13 Ego Elektro Blanc & Fischer Heating element for a glass ceramic cooking unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0250231A1 (fr) * 1986-06-20 1987-12-23 Kanthal Limited Dispositifs de chauffage
GB2192119A (en) * 1986-06-20 1987-12-31 Kanthal Ltd Heating devices
EP0364008A2 (fr) * 1986-06-20 1990-04-18 Kanthal Limited Dispositifs de chauffage
US4975563A (en) * 1986-06-20 1990-12-04 Kanthal Limited Heating devices
EP0364008A3 (en) * 1986-06-20 1990-12-12 Kanthal Limited Heating devices
DE3932854A1 (de) * 1988-10-05 1990-04-12 Rudolf Wille Vorgefertigtes wandteil zur herstellung von waermekammern nach art eines tepidariums sowie ein daraus hergestelltes tepidarium
EP0697185A1 (fr) * 1994-08-18 1996-02-21 Middleby Marshall Inc. Gril pour la restauration construit d'une façon modulaire et sensible à la charge

Also Published As

Publication number Publication date
ATE32157T1 (de) 1988-02-15
DE3233181C2 (de) 1985-08-01
EP0105175B1 (fr) 1988-01-20
EP0105175B2 (fr) 1993-06-23
DE3233181A1 (de) 1984-03-08
JPS5966094A (ja) 1984-04-14
CA1213635A (fr) 1986-11-04
US4617450A (en) 1986-10-14
MX153420A (es) 1986-10-07

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