EP0169643B1 - Appareil de chauffage - Google Patents

Appareil de chauffage Download PDF

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Publication number
EP0169643B1
EP0169643B1 EP19850304076 EP85304076A EP0169643B1 EP 0169643 B1 EP0169643 B1 EP 0169643B1 EP 19850304076 EP19850304076 EP 19850304076 EP 85304076 A EP85304076 A EP 85304076A EP 0169643 B1 EP0169643 B1 EP 0169643B1
Authority
EP
European Patent Office
Prior art keywords
infra
lamps
heating apparatus
lamp
red
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
Application number
EP19850304076
Other languages
German (de)
English (en)
Other versions
EP0169643A1 (fr
Inventor
Graham Howlett Goodchild
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.)
QED Intellectual Property Ltd
Original Assignee
Thorn EMI Patents Ltd
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26287926&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0169643(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from GB848416411A external-priority patent/GB8416411D0/en
Priority claimed from GB848419492A external-priority patent/GB8419492D0/en
Application filed by Thorn EMI Patents Ltd filed Critical Thorn EMI Patents Ltd
Priority to AT85304076T priority Critical patent/ATE48733T1/de
Publication of EP0169643A1 publication Critical patent/EP0169643A1/fr
Application granted granted Critical
Publication of EP0169643B1 publication Critical patent/EP0169643B1/fr
Expired 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
    • H05B3/744—Lamps as heat source, i.e. heating elements with protective gas envelope, e.g. halogen lamps
    • 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
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means

Definitions

  • This invention relates to heating apparatus and in particular, though not exclusively to heating apparatus of the kind disclosed in our copending U.K. Patent Application No. 8320717, (Publication No. 2132060A), wherein one or more sources of infra-red radiation are mounted beneath a layer of an infra-red transmissive glass ceramic to form a cooking hob.
  • the heating apparatus disclosed in U.K. Patent Application No. 8320717 consists of, in one example, four quartz-halogen, infra-red lamps supported above a generally circular metallic tray member, having a layer of thermally-insulative, microporous material disposed on the base thereof.
  • each lamp is preferably provided with an infra-red reflective coating on the underside of the quartz envelope of the lamp, to reflect infra-red radiation emitted downwardly therefrom back in an upward direction, towards and through the glass ceramic layer.
  • a heating apparatus including one or more tungsten-halogen lamps (6; 21-24) mounted beneath a layer (19) transmissive of infra-red radiation generated by said lamp or lamps (6; 21-24) and a base structure (1) comprising a tray, a body of a thermally-insulating material and means for reflecting infra-red radiation, emitted by said lamp or lamps in direction away from said layer (19), back towards said layer (19) for transmission therethrough characterised in that said tray, said body of a thermally insulating material and said reflective means comprise an integral structure (1; 20; 26; 28) made of a ceramic material reflective of, and directly exposed to, said generated infra-red radiation.
  • the structure may form a support for the infra-red source or sources, the support preferably being shaped as a generally circular tray member.
  • the structure may be profiled to conform to the shape of the source or sources, which preferably consist of one or more tubular infra-red lamps.
  • the structure may consist of one or more respective troughs of the infra-red-reflective ceramic material, each trough extending along the length of a lamp and around substantially one half of the lamp circumference.
  • a generally circular shallow tray 1 formed from an infra-red reflective ceramic material, has two extending flanges 2 and 3 arranged on opposite sides of the rim of the ceramic tray 1. Each flange 2 and 3, has upturned end portions 4 and 5, respectively.
  • a number of sources of infra-red radiation preferably four, are disposed above the ceramic tray 1 and are supported at each end by the flanges, 2 and 3.
  • a moulding 7 of ceramic fibre material is disposed above the ceramic tray 1 and press-fitted around the ends of each source 6 to provide a suitable packing therefor.
  • Each source 6 of infra-red radiation comprises a quartz-halogen infra-red lamp including a tungsten filament 8 supported within a tubular quartz envelope 9.
  • a quartz-halogen infra-red lamp including a tungsten filament 8 supported within a tubular quartz envelope 9.
  • One suitable example of such a lamp is disclosed in copending European Application No. 84301636.1, in the name of Thorn EMI plc.
  • Each lamp has moulded ceramic end caps, one shown at 10, enclosing a pinch seal (not shown) with an electrical connection connected to an end of the filament 8 sealed therein.
  • Each end cap 10 is provided with a location tab 11 for easy insertion of the lamps into the correct position on flanges 2 and 3.
  • One or more, preferably four, of the heating apparatus are mounted beneath a layer 19 of infra-red transmissive material, such as glass ceramic, so as to form respective hotplate areas of a cook-top of a cooking hob.
  • infra-red transmissive material such as glass ceramic
  • a thermal limiter 12 which is intended to monitor the temperature of the glass ceramic, includes a metallic wire 13 contained within a quartz tube 14.
  • the wire 13 is arranged to activate a microswitch 15, so as to disconnect the lamps 6 from a power supply, when the temperature of the glass ceramic reaches a maximum predetermined value, thereby preventing overheating and damage to the glass ceramic.
  • the diameter of the wire 13 may be crucial to the temperature of the glass ceramic to which the limiter 12 is sensitive. To ensure that the limiter 12 monitors the a particular temperature of the glass ceramic, it may therefore be necessary to utilise a wire 13 of a particular diameter. Alternatively, other techniques may be used to achieve the desired selectivity in the response characteristics of the limiter.
  • FIGs 3 and 4 wherein like parts are labelled with like reference numerals with respect to Figures 1 and 2, show a second embodiment of the heating apparatus, in accordance with the present invention.
  • the flanges 2 and 3 as provided in the first embodiment, have been replaced by suitably-shaped pieces of insulative material, 16 and 17, through which the ends of each lamp 6 extend and being shaped so that substantially equal portions 18 of each lamp is exposed thereby ensuring that substantially equal amounts of heat are dissipated at the ends of all of the lamps.
  • the second embodiment also enables cool air to circulate around the end cap 10, so as to aid in cooling the pinch seal enclosed therewithin, this being necessary to ensure longevity of the lamps.
  • the ceramic tray 1 acts as a good infra-red reflector, so that radiation emitted from the lamps in a downward direction is reflected upwardly towards the layer of glass ceramic, and is thus transmitted therethrough.
  • FIGs 5 to 7 show schematic illustrations of embodiments which may be used as alternatives to, or in conjunction with, those shown in Figures 1 to 4.
  • Figure 5 illustrates a flat sheet 20 of the ceramic material, disposed beneath four infra-red lamps 21 to 24, mounted beneath a glass ceramic cook-top 25, the sheet 20 either being spaced from, or in close proximity to, the lamps.
  • the apparatus is provided with a profiled sheet 26 of ceramic material, which is shaped to conform to the shape of the tubular lamps 21 to 24.
  • Each profiled portion 27 of the sheet 26 may be directly connected to an adjacent portion, as shown, or alternatively the profiled portions may be joined by connecting flat portions of the sheet 26.
  • FIG. 7 shows another embodiment, wherein each lamp 21 to 24 is provided with a respective trough 28 of the infra-red-reflective ceramic material.
  • the troughs 28 may be shaped to give the required reflectivity, i.e. they may be semicircular, parabolic or semi-elliptical, for example.
  • Each trough 28 preferably extends at least along the whole length of the respective lamp filament and around substantially the lower half of its cross-sectional circumference.
  • the pinch seals of each lamp are required to be kept relatively cool to ensure longevity of the lamps, so that it may be preferable that the troughs 28 do not extend to beneath, or around, the pinch seals.
  • the troughs 28 may be shape so that the filament, such as at 29, of each lamp is situated at the focal point of the trough.
  • the shaped sheet 26 may be incorporated into the base of the tray 1, as shown in Figures 2 and 4.
  • the lower half of the quartz envelope 9 of each lamp 6 may be provided with a suitable infra-red-reflective coating, to aid in reflecting downwardly-emitted radiation in an upward direction towards the glass ceramic layer.
  • the heating apparatus may be provided with thermal insulation, such as a microporous material as used in our above-mentioned copending U.K. Patent Application No. 8320717, disposed within the cooking hob below and/or around the apparatus, in contact therewith or spaced therefrom, so as to aid in preventing heat dissipation from the apparatus.
  • thermal insulation such as a microporous material as used in our above-mentioned copending U.K. Patent Application No. 8320717, disposed within the cooking hob below and/or around the apparatus, in contact therewith or spaced therefrom, so as to aid in preventing heat dissipation from the apparatus.
  • the insulative material may, alternatively or additionally be used as a support for the lamps.
  • the cooking hob may include a forced air cooling system, to aid in preventing overheating of certain parts of the apparatus, particularly the pinch seals of the lamps which are required to be kept relatively cool.
  • Additional or alternative cooling of the pinch seals may be provided by heat sinking and/or natural air convection techniques, such as those disclosed in any of copending European Patent Application Nos. 84303424.0, 84303729.2 and 84303846.4.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (7)

1. Dispositif de chauffage comprenant une ou plusieurs lampes à tungstène-halogène (6; 21-24) montées au-dessous d'une couche (19) transmettant le rayonnement infrarouge produit par la ou lesdites lampes (6; 21-24), et une structure de base (1) comportant une cuvette, un corps réalisé en un matériau thermiquement isolant et des moyens pour réfléchir, en arrière, le rayonnement infrarouge, émis par la ou lesdites lampes dans une direction s'écartant de ladite couche (19), en direction de cette couche pour obtenir une transmission du rayonnement à travers cette couche, caractérisé en ce que ladite cuvette, ledit corps réalisé en un matériau thermiquement isolant et lesdits moyens réfléchissants forment une structure monobloc (1; 20; 26; 28) réalisée en un matériau céramique réfléchissant ledit rayonnement infrarouge produit, et directement exposé à ce rayonnement.
2. Dispositif de chauffage selon la revendication 1, dans lequel ladite structure monobloc (1; 20; 26; 28) fournit un support pour la ou lesdites lampes à tungstène-halogène (6; 21-24). '
3. Dispositif de chauffage selon la revendication 1 ou 2, dans lequel ladite structure monobloc (1; 20; 26; 28) possède la forme d'un élément en forme de cuvette de forme générale circulaire (1).
4. Dispositif de chauffage selon l'une quelconque des revendications précédentes, dans lequel ladite structure monobloc (1; 20; 26; 28) est profilée de manière à avoir une forme adaptée à celle de la ou desdites lampes à tungstène-halogène (6; 21-24).
5. Dispositif de chauffage selon la revendication 1 ou 2, dans lequel ladite structure monobloc (1; 20; 26; 28) inclut un ou plusieurs éléments respectifs en forme d'auges (28), formés par ledit matériau céramique réfléchissant le rayonnement infrarouge, chaque élément en forme d'auge (28) s'étendant sur l'étendue en longueur d'une lampe (6; 21-24) et sensiblement autour d'une moitié de la circonférence de ladite lampe (6; 21-24).
6. Dispositif de chauffage selon la revendication 1 ou 2, dans lequel lesdits moyens (1; 20; 26; 28) réfléchissant le rayonnement infrarouge sont constitués par une feuille sensiblement plate (20) formée dudit matériau céramique réfléchissant le rayonnement infrarouge.
7. Dispositif de chauffage selon l'une quelconque des revendications précédentes, incluant en outre un matériau thermiquement isolant contribuant à empêcher une dissipation de chaleur à partir dudit dispositif et/ou supportant la ou lesdites lampes à tungstène-halogène (6; 21-24).
EP19850304076 1984-06-28 1985-06-10 Appareil de chauffage Expired EP0169643B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85304076T ATE48733T1 (de) 1984-06-28 1985-06-10 Heizgeraet.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB848416411A GB8416411D0 (en) 1984-06-28 1984-06-28 Heating apparatus
GB8416411 1984-06-28
GB848419492A GB8419492D0 (en) 1984-07-31 1984-07-31 Heating apparatus
GB8419492 1984-07-31

Publications (2)

Publication Number Publication Date
EP0169643A1 EP0169643A1 (fr) 1986-01-29
EP0169643B1 true EP0169643B1 (fr) 1989-12-13

Family

ID=26287926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850304076 Expired EP0169643B1 (fr) 1984-06-28 1985-06-10 Appareil de chauffage

Country Status (2)

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EP (1) EP0169643B1 (fr)
DE (1) DE3574809D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8700886A (nl) * 1987-04-15 1988-11-01 Philips Nv Elektrische kookeenheid en elektrisch kooktoestel voorzien daarvan.
DE3723077A1 (de) * 1987-07-11 1989-01-19 Bauknecht Hausgeraete Strahlheizkoerper fuer kochgeraete
AT399979B (de) * 1991-03-18 1995-08-25 Philips Nv Mit einer hand tragbares erhitzungsgerät
DE202005011888U1 (de) * 2005-07-28 2005-10-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Kochvorrichtung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
JPS4637181Y1 (fr) * 1968-05-18 1971-12-22
US3718497A (en) * 1970-11-19 1973-02-27 Gen Motors Corp Heater coil support
FR2138464B1 (fr) * 1971-05-26 1973-05-25 Scholtes Ets Eugen
US3836751A (en) * 1973-07-26 1974-09-17 Applied Materials Inc Temperature controlled profiling heater
DE2809131C2 (de) * 1978-03-03 1982-05-19 Ako-Werke Gmbh & Co., 7988 Wangen Elektrische Kochplatte
GB2132060B (en) * 1982-12-24 1985-12-18 Thorn Emi Domestic Appliances Heating apparatus
GB8321717D0 (en) * 1983-08-12 1983-09-14 Thorn Emi Domestic Appliances Heating apparatus

Also Published As

Publication number Publication date
DE3574809D1 (de) 1990-01-18
EP0169643A1 (fr) 1986-01-29

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