EP0507248B1 - Glaskeramik-Kochmulde mit einer reflektierenden Oberfläche in Überhitzungsschutzstellung in bezug auf einen Licht- und/oder Wärmeerzeuger - Google Patents

Glaskeramik-Kochmulde mit einer reflektierenden Oberfläche in Überhitzungsschutzstellung in bezug auf einen Licht- und/oder Wärmeerzeuger Download PDF

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Publication number
EP0507248B1
EP0507248B1 EP19920105515 EP92105515A EP0507248B1 EP 0507248 B1 EP0507248 B1 EP 0507248B1 EP 19920105515 EP19920105515 EP 19920105515 EP 92105515 A EP92105515 A EP 92105515A EP 0507248 B1 EP0507248 B1 EP 0507248B1
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EP
European Patent Office
Prior art keywords
light
cooking hob
generator
heat
reflecting element
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
EP19920105515
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English (en)
French (fr)
Other versions
EP0507248A3 (en
EP0507248A2 (de
Inventor
Enzo C/O Whirlpool Italia S.R.L. Cigarini
Franciscus C/O Whirlpool Italia S.R.L. Kokkeler
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Whirlpool Europe BV
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Whirlpool Europe BV
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Filing date
Publication date
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Publication of EP0507248A2 publication Critical patent/EP0507248A2/de
Publication of EP0507248A3 publication Critical patent/EP0507248A3/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/22—Reflectors for radiation heaters

Definitions

  • This invention relates to a glass ceramic cooking hob of the type comprising a surface on which containers containing food to be prepared are placed, below said surface there being provided at least one light and/or heat generator, such as a halogen lamp or the like, at which there is positioned an element reflecting the light and/or heat and having at least one face facing the generator or halogen lamp and an opposing face facing an external environment, said surface and said reflecting element defining a chamber in which said generator is located.
  • a light and/or heat generator such as a halogen lamp or the like
  • the reflecting element is generally formed of aluminium because this material has considerable reflecting properties. This element allows optimum direction of the lamp-generated light rays towards the cooking hob, on the surface of which said container is placed, so increasing the heat transmitted to this latter.
  • the quantity of heat energy which can be fed to said container is limited by the reflecting element itself, which is generally the thermally weakest member of the glass ceramic cooking hob.
  • This element heats up both because of the energy (eg. light energy) which reaches it and also because of conduction between the air present in the chamber containing the generator and the element itself.
  • energy eg. light energy
  • DE-A-3 903 540 discloses a radiator having a parabolic reflector and a convection channel between the reflector and the housing of the radiator.
  • An object of the present invention is to provide a cooking hob in which the reflecting element is thermally protected so as to prevent it overheating, or generally to prevent it reaching a temperature which could induce mechanical damage.
  • a further object is to provide a reflecting element which is thermally reinforced and allows a greater transfer of energy to the container placed on the hob.
  • a further object is to provide a cooking hob in which the reflecting element can be maintained at a temperature lower than that at which damage or deformation could result.
  • a glass ceramic cooking hob of the aforesaid type characterised by comprising at least one body between the light and/or heat generator and the reflecting element, said body being transparent to the energy emitted by the light and/or heat generator and defining an interspace at the reflecting element, so as to thermally insulate this latter from a part of the chamber, containing said generator, which is more sensitive to the heat generated during the operation of said generator.
  • a glass ceramic cooking hob is indicated overall by 1. It comprises a surface 2 which supports with direct contact usual containers 3 (only one is shown in Figure 1) containing food 4 to be subjected to preparation.
  • heating elements 5 are associated with the cooking hob 1, they being positioned below the hob.
  • the elements 5 are halogen lamps 6 powered in any known manner and of suitable (known) shape to heat the containers 3 on the hob 1 by the heat generated during their operation.
  • a known screen or reflecting element 10 arranged to suitably direct the light and heat rays 11 generated by said lamps towards the upperly positioned hob 1.
  • the screen 10 is constructed of aluminium and comprises a series of concavities and convexities 12 and 13 (with reference to the lamps), the concavities being positioned in correspondence with and below the lamps 6.
  • the screen 10 directs the rays 11 substantially perpendicularly onto the hob 1, thus increasing the heating effect of the rays on the hob.
  • the aluminium screen 10 has a face 15 facing the lamps 6 and a face 16 facing an external environment, such as a compartment 17 of a usual kitchen furniture unit 18.
  • a body 20 advantageously having the same shape as the element 10 and lying parallel to it.
  • the body 20 is formed of a material which is transparent to the light energy emitted by the lamps 6 but has a low capacity to conduct heat and a low refractive index, such as the usual constituent material of the glass ceramic hob.
  • the body 20 divides the chamber 19 into two portions 21 and 22.
  • One of these, namely the portion 21, contains the lamp with the result that the air contained in it is subject to greater heating by virtue of their operation.
  • the other portion 22 is substantially insulated from the portion 21 by the body 20, the air present in it being subject to lesser heating by virtue of the operation of the lamps 6.
  • the element or screen 10 is less subject to heating by conduction deriving from the contact between the screen and the (hot) air present about the lamps.
  • the heating of the reflecting element is hence reduced overall, so preventing its temperature reaching a value critical or its mechanical stability.
  • Any heat absorbed by the reflecting element 10 is removed from it by natural or forced convention.
  • a usual fan 24 driven by its own electric motor 25 (powered in known manner) is provided in the compartment 17 to direct the air so that it grazes the element or screen 10 and removes from it the heat absorbed by it during the operation of the lamps 6.
  • an aperture 26 is provided in a wall 18A thereof to connect the compartment 17 to the room containing the furniture unit 18 (such as a kitchen).
  • a grille 27 is placed over the aperture 26.
  • the fan 24 is operated (either directly as a result of the operation of lamps 6 or via a suitable pushbutton 28 located on the control panel 29 for the heat generators 5, or following the operation of the lamps 6 but with a suitable delay set by a usual timer connected to a usual electrical feed circuit for the lamps 6).
  • the operation of the fan causes cooling of the screen 10, thus reducing its probability of suffering mechanical damage as a result of excessive overheating caused by the heat stored during the operation of the lamps 6.
  • a cooking hob as described is of simple construction and enables possible malfunction deriving from damage to the screens or reflecting elements associated with its light and/or heat generators to be prevented, where such damage is related to excessive screen heating.
  • the upper surface of said hob on which the food containers are placed for food preparation can be raised to a very high temperature with safety, so allowing better and quicker food treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
  • Table Equipment (AREA)

Claims (6)

  1. Glaskeramische Kochmulde mit einer Stellfläche (2), auf die Behälter gestellt werden, in denen sich zuzubereitende Speisen befinden, wobei unter dieser Stellfläche mindestens ein Licht- oder Wärmeerzeuger (5), wie eine Halogenlampe oder dergl., vorgesehen ist, bei dem ein das Licht und/oder die Wärmestrahlen reflektierendes Element (10) angeordnet ist, das mit mindestens einer Fläche dem Generator oder der Halogenlampe und mit einer entgegengesetzten Fläche einer äußeren Umgebung zugewandt ist, wobei die Stellfläche (2) und das Reflektorelement (10) eine den Generator aufnehmende Kammer (19) bilden, dadurch gekennzeichnet, daß mindestens ein Körper (20) zwischen dem Licht- und/oder Wärmegenerator (5) und dem Reflektorelement (10) angeordnet ist, daß der Körper (20) für die vom Licht- und/oder Wärmegenerator (5) abgestrahlte Energie durchlässig ist und daß der Körper (20) einen solchen Abstand (22) vom Reflektorelement (10) hat, daß das Reflektorelement (10) von einem Teil (21) der den Generator (5) enthaltenden Kammer (19) thermisch isoliert wird, wobei dieser Kammerteil empfindlicher auf die während des Betriebes des Generators (5) erzeugte Wärme reagiert.
  2. Kochmulde nach Anspruch 1, dadurch gekennzeichnet, daß das Reflektorelement (10) einem Luftstrom ausgesetzt wird, der von einem Ventilator (24) erzeugt wird, welcher von einem ihm zugeordneten Motor (25) angetrieben wird.
  3. Kochmulde nach Anspruch 1, dadurch gekennzeichnet, daß der Körper (20) dieselbe Form wie das Reflektorelement hat und parallel zum Reflektorelement in derjenigen Kammer (19) angeordnet ist, in der sich der Licht- und/oder Wärmegenerator (5) befindet.
  4. Kochmulde nach Anspruch 1, dadurch gekennzeichnet, daß der Körper (20) um den Licht- oder Wärmegenerator (5) angeordnet ist.
  5. Kochmulde nach Anspruch 1, die in einer bekannten Küchenmöbeleinheit eingebaut ist, dadurch gekennzeichnet, daß die äußere Umgebung ein Fach (17) in der Küchenmöbeleinheit (18) ist und daß dieses Fach nach außen in die äußere Umgebung über mindestens eine geeignete Öffnung (26) mündet, die vorteilhafterweise mit einem Gitter (27) abgedeckt ist.
  6. Kochmulde nach den Ansprüchen 2 und 5, dadurch gekennzeichnet, daß der Ventilator (24) zur Kühlung des Reflektorelements im Fach (17) amgeordnet ist.
EP19920105515 1991-04-05 1992-03-31 Glaskeramik-Kochmulde mit einer reflektierenden Oberfläche in Überhitzungsschutzstellung in bezug auf einen Licht- und/oder Wärmeerzeuger Expired - Lifetime EP0507248B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI910291 1991-04-05
ITMI910291U 1991-04-05
IT000291 IT221794Z2 (it) 1991-04-05 1991-04-05 Piano di cottura in vetroceramica in cui una superficie riflettente disposta in corrispondenza di un generatore di luce e/o calore, in particolare una lampada alogena, e' protetta da surriscaldamenti

Publications (3)

Publication Number Publication Date
EP0507248A2 EP0507248A2 (de) 1992-10-07
EP0507248A3 EP0507248A3 (en) 1993-06-16
EP0507248B1 true EP0507248B1 (de) 1997-06-18

Family

ID=11358436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920105515 Expired - Lifetime EP0507248B1 (de) 1991-04-05 1992-03-31 Glaskeramik-Kochmulde mit einer reflektierenden Oberfläche in Überhitzungsschutzstellung in bezug auf einen Licht- und/oder Wärmeerzeuger

Country Status (3)

Country Link
EP (1) EP0507248B1 (de)
DE (1) DE69220403T2 (de)
IT (1) IT221794Z2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706022A1 (fr) * 1993-06-01 1994-12-09 Jolly Marcel Appareil de cuisson avec son récipient.
GB2367887A (en) * 2000-10-09 2002-04-17 Mindy Tsao Electric oven with heat radiation reflection device
DE10240148A1 (de) * 2002-08-30 2004-03-11 BSH Bosch und Siemens Hausgeräte GmbH Kochfläche mit Einlageelement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1275261B (de) * 1955-01-10 1968-08-14 Johann Achterfeld Sicherheitseinrichtung an mit festen Brennstoffen befeuerten, mit einer mit elektrischem Strom oder mit Gas betriebenen Aufsatzherdplatte ausgestatteten Herden
GB1433354A (en) * 1973-05-04 1976-04-28 Jenn Air Corp Stove with selectively interchangeable cooking apparatus
DE3903540A1 (de) * 1989-02-07 1990-08-09 Guenter Petz Heizstrahler

Also Published As

Publication number Publication date
DE69220403T2 (de) 1997-12-11
EP0507248A3 (en) 1993-06-16
ITMI910291U1 (it) 1992-10-05
ITMI910291V0 (it) 1991-04-05
DE69220403D1 (de) 1997-07-24
EP0507248A2 (de) 1992-10-07
IT221794Z2 (it) 1994-10-20

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