EP0355388B1 - Elément de chauffage par rayonnement ainsi que procédé et dispositif de fabrication - Google Patents

Elément de chauffage par rayonnement ainsi que procédé et dispositif de fabrication Download PDF

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Publication number
EP0355388B1
EP0355388B1 EP89113041A EP89113041A EP0355388B1 EP 0355388 B1 EP0355388 B1 EP 0355388B1 EP 89113041 A EP89113041 A EP 89113041A EP 89113041 A EP89113041 A EP 89113041A EP 0355388 B1 EP0355388 B1 EP 0355388B1
Authority
EP
European Patent Office
Prior art keywords
heating coil
insulating material
filling material
insulator
interior
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
EP89113041A
Other languages
German (de)
English (en)
Other versions
EP0355388A1 (fr
Inventor
Leonhard Dörner
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer 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 EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT89113041T priority Critical patent/ATE86373T1/de
Publication of EP0355388A1 publication Critical patent/EP0355388A1/fr
Application granted granted Critical
Publication of EP0355388B1 publication Critical patent/EP0355388B1/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
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • 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

Definitions

  • the invention relates to a radiant heater, in particular for use in heating glass ceramic hot plates, baking roasters or the like. as well as a method and a device for its production.
  • the heating coils are attached to insulating bodies for radiant heaters either by inserting them into the grooves of the insulating body, by fastening them on the surface of the insulating body with clips or by embedding the heating coil in a damp insulating body into which the heating coil is pressed and fixed there after drying.
  • This latter method has been shown to be very advantageous, but is relatively complex and requires a predominantly fibrous insulating material that has good mechanical strength, but is therefore somewhat lower in the thermal insulating properties.
  • This insulator are therefore usually underlaid with a layer of an Aerosil, which, however, has a low level of mechanical strength with good heat resistance and excellent electrical and thermal insulation properties.
  • the object of the invention is to propose a radiant heater and a method and a device for its production, in which disadvantages of known solutions are avoided and in which, in particular, embedding of the heating coils in the insulating body is possible with a good hold therein.
  • the insulating body is produced in that the interior of the heating coil is filled over a portion of its cross-sectional area with the filler material which can be introduced into the interior of the heating coil and then the insulating material is applied in such a way that it fills the space free of filling material in the interior of the heating coil, after which then the filling material is removed.
  • the filling material can be a flowable material, for example quartz sand.
  • the insulating material can be poured in dry form onto the heating coils lying on a suitable base, partially filled with the filling material, preferably a free-flowing material, in particular an airgel based on pyrogenic silica or aluminum oxide, optionally with fiber reinforcement and with binding agent, as the insulating material. and opacifiers is used.
  • a free-flowing material in particular an airgel based on pyrogenic silica or aluminum oxide, optionally with fiber reinforcement and with binding agent, as the insulating material. and opacifiers is used.
  • the insulating material can be pressed before the filling material is removed, so that it forms a relatively solid block, which under many conditions alone is sufficient to ensure the necessary strength.
  • the filling material has penetrated between the turns of the heating coils and partially enclosed them.
  • the shape of the part of the insulating body which forms the embedding and remains in the interior of the heating coil can also be determined by the size of the filling material in the interior of the heating coil and possibly also a certain shape with a concave or convex surface. This can also be done by designing the heating coil as an upstanding oval. It is thus possible to extend the pressing pressure even into the interior of the heating coil without the heating coil itself being deformed or the insulating body being additionally damaged if, for example, a heating coil itself is pressed into the dry, pre-pressed insulating body.
  • the resulting insulating body has, apart from a good definition of the heating coil, the advantage that part of its inner cross-sectional area is free of insulating material, so that the radiation conditions of the radiant heater are good and the insulating body is not unnecessarily thermally stressed or heated.
  • the insulating body can preferably be thermally cured after pressing. This can also happen if it is used for the first time or during a test run. It can corresponding known curing agents are used. It is also possible to introduce a hardening agent into the filling material and to let it penetrate from there into the adjacent areas of the insulating material. In this case, the embedding points would preferably be hardened, which results in an ideal insulating body with increased strength in the area of the embedding, but otherwise the best thermal insulation properties. In the case of multi-component hardeners, only one component of this hardening agent could also be present in the filler material.
  • a preferred device for producing radiant heaters of the type described contains a tool in which the heating coils are partially accommodated in grooves and a device for partially filling a flowable or free-flowing filler material in the grooves and a pressing device for subsequent embedding pressing of the heating coil with the Insulating material.
  • the free-flowing material is preferably incompressible and forms a "counter-pressure stamp" located inside the heating coil, on which the insulating material can be firmly pressed.
  • a preferred radiant heater can be produced by the method and the device, as is evident from claim 7.
  • the insulating material can particularly preferably consist of a free-flowing substance, in particular an airgel of the type already mentioned.
  • the radiant heater is particularly characterized by that the surface of the section of the insulating body lying inside the heating coil is the impression of the filler material which can be introduced into the inside of the heating coil.
  • the distance between the individual turns of the heating coil should be greater than the wire thickness so that a good penetration of the filler material on the one hand and the insulating material on the other hand is possible inside the heating coil and that the heating coil which holds the heating coil between the Insulating body webs extending through wire windings have a sufficient cross section.
  • Fig. 1 shows a device 11 which is arranged on a tool table or stand 12 and carries a tool 13 which has the shape of a plate with grooves 14 formed on its upper side, which have a substantially semicircular cross section.
  • the grooves run on the upper tool surface 15, for example in a spiral, zigzag or meandering shape, depending on how heating coils 16 are to be arranged on the surface of an insulating body.
  • the tool can have recesses in the edge area which, for example, form a peripheral edge of an insulating body.
  • Heating coils 16 are inserted into the grooves 14 and partially protrude from the grooves.
  • the proportion of the heating coil cross section that protrudes upward from the grooves, together with the groove depth, determines the height of the later embedding of the heating coils in an insulating body 21.
  • a filling material 17 which consists for example of quartz sand as the main constituent, is introduced into the grooves 14. It is also possible to use a material such as wax or stearin that is liquid when warm.
  • the filling material is preferably filled in so far that its surface is essentially flush with the upper tool surface 15. However, it can also be slightly above or below, and it can also take on a certain shape through appropriate introduction or after-treatment steps, for example a concave or convex shape, which then also determines the shape of the insulating body at this point. This could be done, for example, by shaking or other measures.
  • the shape of the grooves does not have to correspond exactly to the heating coils. It should only be such that the heating coils are guided well during processing. Around however, to avoid an external enclosure of the heating coils in the groove area; the grooves should be matched relatively precisely to the heating coils. A shaping of the grooves according to the individual turns should only be necessary in exceptional cases.
  • the filler material could also be introduced before the heating coils if, for example, the heating coils were introduced into the grooves from above by a vibration process under appropriate pressure. It would also do no harm if the filler material still grips under the heating coils, because the filler material acts just like a fixed tool stamp due to its incompressibility
  • An insulating material is poured onto the tool 13 prepared in this way, which is preferably an airgel based on pyrogenic silica or aluminum oxide and can optionally contain a fiber reinforcement. It contains conventional binders and opacifiers, for example ilmenite, iron oxide or the like.
  • the insulating material is very light and free-flowing and penetrates well between the turns of the heating filaments and fills the portion 20 of the interior of the heating filament not occupied by the filling material 17 up to the surface of the filling material.
  • This dry, pourable insulating material 21 is then pressed by a press ram 22 with an indicated, for example hydraulic, pressing device 23 against the tool 13.
  • the section 20 lying inside the heating coil is also compressed by insulating material being pushed through the windings.
  • a largely homogeneous body made of pressed dry insulating material is formed. It can then be heat-treated to thermally contained in the opacifiers or binders hardening materials of known consistency to be effective. Their proportion and the degree of pressing depends on the requirements for the strength and, in particular, the abrasion resistance of the insulating body.
  • An additional partial hardening in the area of the embedding can be done by adding a hardening agent to the filler material 17, which is pressed out of the filler material during the pressing or also penetrates capillary into the adjacent parts of the insulating body. It is also possible to provide the insulating body with different proportions of hardening additives and to increase the dosage on the heating coils.
  • the dry-pressed insulating body 21 is removed from the device 11 by moving the device parts 13, 22 apart.
  • the filling material 17 trickles itself between the turns of the heating coils 16 or remains in the grooves from where it can either be used immediately or removed by shaking off, blowing off or suctioning off and, if necessary, can be used again after refurbishment.
  • Suitable as filling material are all free-flowing or to some extent flowable materials that are largely incompressible and cannot be displaced like a pure liquid or penetrate into the insulating material, for example due to the inherent friction of the individual particles from which they consist. Accordingly, the consistency will usually be between “dusty” and “granular”, or liquid when using wax or stearin.
  • FIG. 2 and 3 show the finished radiant heater in its position of use with the direction of radiation upwards
  • a glass ceramic plate 23 is shown, under which the radiant heater 24 is arranged and shines through it upwards.
  • the radiant heater is also suitable for other applications, for example for heating ovens etc.
  • the radiator can also be clearly distinguished from radiators produced differently, because normally in the region of the section 37 located in the interior of the heating coil, its surface 26 has a different structure than the surface 35 formed by the tool 13. This usually begins Structured surface 26 is already slightly outside of the heating coil 16 and forms a small edge 27 there. Depending on the degree of filling of the filling material 17, the surface 26 is slightly higher or possibly also lower than the surface 35. If the grooves 14 are just filled, Before the pressing begins, the surface 26 is somewhat higher because the filling material settles somewhat during the pressing.
  • the surface 26 and possibly also the surface 35 can be designed in a simple manner as desired.
  • the heating coil in the region of a rib running parallel to it or also crossing it, or of a longitudinal projection. This can be achieved by appropriate design of the surface of the tool 13 and the grooves and by a special shape of the bed.
  • the pouring could take place through pouring channels or nozzles running along the grooves, which produce a specific pattern of the filling material inside the heating coil.
  • a concave shape of the section 17 which is adapted to the curvature of the turns of the heating coil can be achieved.
  • the area under a heating coil could also be poured through cover a little less high when the bed was laid through the heating coil, so that the insulating material came to be somewhat higher at this point and therefore an enclosure especially the heating coil enables.
  • the surface 26 in FIG. 2 would have a corrugated shape, which descends between the heating coils.
  • the insulating body section 37 preferably comprises only the lower part, for example a third to half the circumference of the turns of the heating coil 16. This is sufficient for a good fixing. It is important that considerable portions of the heating coil and accordingly a section 36, which preferably occupies more than half of the heating coil cross section, are free of the insulating body in order to be able to radiate freely.
  • the embedded and non-binding parts change depending on the nature of the insulating material and the strength and usage requirements for the radiant heater. The use of oval heating coils arranged upright is particularly favorable.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • General Induction Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Claims (9)

  1. Procédé de fabrication de radiateurs de chauffage (24) avec un corps isolant composé d'un matériau isolant (21) et a l'intérieur duquel sont partiellement enrobées des spirales chauffantes (16), caractérisé par le fait que l'intérieur de la spirale chauffante (16) est rempli sur une partie de sa section avec le matériau de remplissage (17) qui est déposé à l'intérieur de la spirale chauffante (16), ensuite que le matériau isolant est introduit de telle sorte qu'il comble l'espace vide (20) de matériau de remplissage (17) à l'intérieur de la spirale chauffante, et que par la suite le matériau de remplissage est retiré.
  2. Procédé, d'après la revendication 1, caractérisé par le fait que le matériau isolant est sec au moment de son dépôt et/ou est comprimé avant le retrait du matériau de remplissage (17) et qu'après la compression le corps isolant (21) est durci, de préférence par un procédé thermique.
  3. Procédé, d'après l'une des revendications précédentes, caractérisé par le fait que le matériau de remplissage utilisé est un matériau fluide comme le quartz etc. et que de préférence la surface du radiateur de chauffage munie de spirales chauffantes (16) est débarrassée, après la compression et le cas échéant le durcissement, des particules de matériau de remplissage (17) par soufflage ou aspiration d'air.
  4. Procédé, d'après l'une des revendications précédentes, caractérisé par le fait que le matériau isolant se compose d'une matière fluide, en particulier un aérogel sur une base d'acide silicique pyrogéné ou d'oxyde d'aluminium, le cas échéant renforcé par des fibres, et contient un liant et un opacifiant.
  5. Procédé, d'après l'une des revendications précédentes, caractérisé par le fait que le matériau de remplissage (17) est au moins mélangé avec des composants d'un agent durcissant et est déposé dans une zone adjacente au matériau isolant.
  6. Dispositif de fabrication de radiateurs de chauffage (24) avec un corps isolant composé d'un matériau isolant (21) et à l'intérieur duquel sont partiellement enrobées des spirales chauffantes (16), caractérisé par un moule (13) dans lequel une partie des spirales chauffantes (16) est insérée dans des rainures (14), par un dispositif de remplissage partiel par un matériau de remplissage (17) à écoulement libre ou fluide dans les rainures (14), et par un dispositif de pressage (23) pour l'enrobage consécutif des spirales chauffantes par pression (16) avec un matériau isolant.
  7. Radiateurs de chauffage avec un corps isolant (21) composé de matériau isolant à l'intérieur duquel se trouve au moins une spirale chauffante, caractérisés par le fait que l'intérieur de la spirale chauffante sur une partie de sa section (37) est rempli de matériau isolant par inclusion dans ce dernier et ainsi la spirale chauffante est fixée dans le corps isolant (21) ; la surface (26) de la section (37) est l'empreinte d'un matériau de remplissage (17) retiré de l'intérieur de la spirale chauffante.
  8. Radiateurs de chauffage, d'après la revendication 7, caractérisés par le fait que le matériau isolant se compose d'une matière comprimée, fluide lorsqu'elle n'est pas comprimée, en particulier un aérogel sur une base d'acide silicique pyrogéné ou d'oxyde d'aluminium, le cas échéant renforcé par des fibres et contient un liant et un opacifiant.
  9. Radiateurs de chauffage, d'après les revendications 7 ou 8, caractérisés par le fait que le corps isolant (21) se compose d'un matériau isolant qui se solidifie par durcissement et/ou que la distance entre chaque spire de la spirale chauffante (16) est supérieure à la grosseur du fil.
EP89113041A 1988-08-19 1989-07-15 Elément de chauffage par rayonnement ainsi que procédé et dispositif de fabrication Expired - Lifetime EP0355388B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89113041T ATE86373T1 (de) 1988-08-19 1989-07-15 Strahlheizkoerper sowie verfahren und vorrichtung zu seiner herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3828192A DE3828192A1 (de) 1988-08-19 1988-08-19 Strahlheizkoerper sowie verfahren und vorrichtung zu seiner herstellung
DE3828192 1988-08-19

Publications (2)

Publication Number Publication Date
EP0355388A1 EP0355388A1 (fr) 1990-02-28
EP0355388B1 true EP0355388B1 (fr) 1993-03-03

Family

ID=6361194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113041A Expired - Lifetime EP0355388B1 (fr) 1988-08-19 1989-07-15 Elément de chauffage par rayonnement ainsi que procédé et dispositif de fabrication

Country Status (7)

Country Link
US (2) US5048176A (fr)
EP (1) EP0355388B1 (fr)
JP (1) JPH0282486A (fr)
AT (1) ATE86373T1 (fr)
DE (2) DE3828192A1 (fr)
ES (1) ES2038806T3 (fr)
YU (1) YU159589A (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501098C2 (sv) * 1993-03-02 1994-11-14 Tetra Laval Holdings & Finance Anordning för försegling, sätt vid framställning av en förseglingsback och användning
GB2278261B (en) * 1993-05-21 1996-07-03 Ceramaspeed Ltd Method of manufacturing a radiant electric heater
DE19506685A1 (de) * 1995-02-25 1996-08-29 Ego Elektro Blanc & Fischer Elektrischer Strahlungsheizkörper und Verfahren zu seiner Herstellung
DE19522798A1 (de) * 1995-06-23 1997-01-02 Ego Elektro Blanc & Fischer Verfahren zur Herstellung eines Strahlungsheizkörpers und Strahlungsheizkörper
JP3826961B2 (ja) * 1996-03-25 2006-09-27 ローム株式会社 加熱体およびその製造方法
JP3408137B2 (ja) * 1998-02-27 2003-05-19 三洋電機株式会社 加熱調理装置
DE20304976U1 (de) * 2003-03-26 2004-07-29 Krieger, Detlev, Dipl.-Ing. Elektrische Widerstandsheizvorrichtung
DE20304982U1 (de) * 2003-03-26 2004-08-05 Krieger, Detlev, Dipl.-Ing. Elektrische Widerstandsheizvorrichtung
GB0811980D0 (en) * 2008-07-07 2008-07-30 Ceramaspeed Ltd Radiant electric heater
US20210041108A1 (en) * 2019-08-09 2021-02-11 Eidon, Llc Apparatuses for radiant heating

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436816A (en) * 1965-10-22 1969-04-08 Jerome H Lemelson Method of making heat transfer panelling
US3500444A (en) * 1968-01-16 1970-03-10 Johns Manville Electrical heating unit with an insulating refractory support
US4091355A (en) * 1977-01-19 1978-05-23 Btu Engineering Corporation Anchored coil heater
DE2820138A1 (de) * 1978-05-09 1979-11-15 Karl Fischer Strahlungs-heizeinheit insbesondere fuer glaskeramik-elektrokochgeraete
US4207672A (en) * 1978-12-18 1980-06-17 Aerospex Corporation Heater element mounting
DE3129239A1 (de) * 1981-07-24 1983-02-10 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer heizkoerper fuer die beheizung einer platte und verfahren zu seiner herstellung
DE3206508C2 (de) * 1982-02-24 1986-02-27 KERFA GmbH Industriebeheizungen, 5820 Gevelsberg Verfahren zur Herstellung eines elektrischen Keramikfaser-Flächenheizelementes
DE3519350A1 (de) * 1985-05-30 1986-12-04 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlungs-heizeinheit
DE3527413A1 (de) * 1985-07-31 1987-02-12 Ego Elektro Blanc & Fischer Elektrischer strahlheizkoerper zur beheizung von heizflaechen sowie verfahren und vorrichtung zu seiner herstellung
DE3527533A1 (de) * 1985-08-01 1987-02-12 Ego Elektro Blanc & Fischer Elektrokochplatte
DE3602541A1 (de) * 1986-01-29 1987-07-30 Rommelsbacher & Co Elektrowaer Heizwendeltraeger, damit versehene kochplatte und verfahren zu seiner herstellung
EP0234373A3 (fr) * 1986-02-26 1988-03-02 E.G.O. Elektro-Geräte Blanc u. Fischer Unité de cuisson avec élément chauffant radiant
DE3709608A1 (de) * 1987-03-24 1988-10-06 Rommelsbacher & Co Elektrowaer Verfahren zum herstellen eines heizwendeltraegers und formwerkzeug zur durchfuehrung des verfahrens
DE8706277U1 (de) * 1987-05-01 1987-06-25 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer Strahlungsheizkörper zur Beheizung einer Platte, insbesondere einer Glaskeramikplatte

Also Published As

Publication number Publication date
US5196678A (en) 1993-03-23
YU159589A (sh) 1992-07-20
ES2038806T3 (es) 1993-08-01
DE58903642D1 (de) 1993-04-08
US5048176A (en) 1991-09-17
JPH0282486A (ja) 1990-03-23
ATE86373T1 (de) 1993-03-15
DE3828192A1 (de) 1990-02-22
EP0355388A1 (fr) 1990-02-28

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