EP0932326A2 - Elément de chauffage électrique rayonnant - Google Patents

Elément de chauffage électrique rayonnant Download PDF

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Publication number
EP0932326A2
EP0932326A2 EP99300056A EP99300056A EP0932326A2 EP 0932326 A2 EP0932326 A2 EP 0932326A2 EP 99300056 A EP99300056 A EP 99300056A EP 99300056 A EP99300056 A EP 99300056A EP 0932326 A2 EP0932326 A2 EP 0932326A2
Authority
EP
European Patent Office
Prior art keywords
base layer
insulation material
dish
heater according
support
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.)
Withdrawn
Application number
EP99300056A
Other languages
German (de)
English (en)
Other versions
EP0932326A3 (fr
Inventor
Peter Ravenscroft Wilkins
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.)
Ceramaspeed Ltd
Original Assignee
Ceramaspeed 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
Application filed by Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Publication of EP0932326A2 publication Critical patent/EP0932326A2/fr
Publication of EP0932326A3 publication Critical patent/EP0932326A3/fr
Withdrawn legal-status Critical Current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
    • H05B3/72—Plates of sheet metal
    • 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
    • H05B2203/032—Heaters specially adapted for heating by radiation heating

Definitions

  • This invention relates to radiant electric heaters, particularly, but not exclusively, for use in cooking appliances.
  • Radiant electric heaters are well known comprising a dish-like support containing thermal and electrical insulation material and having supported therein one or more radiant electric heating elements.
  • a metal dish-like support has therein a base layer of insulation material, such as microporous thermal and electrical insulation material and one or more radiant heating elements, such as of wire or ribbon form are supported on the base layer.
  • a wall of insulation material is also known to be provided around the periphery of the dish-like support, such wall being separate from, or integral with, the base layer.
  • Such grid or mesh suitably contacts the upper surface of the peripheral wall of the heater.
  • GB-A-2 254 776 describes an electric cooking grill in which a heating element is supported in spaced relationship relative to a backing layer made from a heat insulation layer.
  • a layer of diffusing material for example of perforated metal, is supported in spaced relationship relative to the heating element on that side thereof remote from the backing layer.
  • a bridging member serves to prevent the diffusing layer bowing upwards to contact the heating element in use.
  • ribs may be provided which additionally support the heating element.
  • GB-A-2 254 776 is limited in its application because the bridging member or ribs is required to withstand the entire force that may be applied thereto by the layer of diffusing material.
  • the present invention provides a radiant electric heater comprising a dish-like support containing a base layer of thermal and electrical insulation material and having supported therein one or more radiant electric heating elements, a metal grid or mesh means overlying the heater and spaced from the one or more heating elements, and at least one spacer means provided inside the dish-like support and cooperating with the metal grid or mesh means, wherein the at least one spacer means is engaged in the base layer of insulation material and extends between the metal grid or mesh means and the dish-like support and/or the base layer of insulation material.
  • the at least one spacer means may contact, and be optionally secured to, the metal grid or mesh means.
  • the at least one spacer means may be moulded into the base layer of insulation material.
  • the base layer of insulation material may comprise microporous thermal and electrical insulation material. Such microporous insulation material may be moulded into the dish-like support and the at least one spacer means may be simultaneously moulded into the base layer.
  • the at least one spacer means may comprise at least one boss, peg or pillar, such as of ceramic or metal.
  • a single spacer means may be provided, located substantially in a central region of the heater.
  • the dish-like support may have a peripheral wall, the metal grid or mesh means being arranged to be provided in a plane defined substantially by an upper surface of the wall.
  • the peripheral wall may be provided of thermal insulation material and may be separate from, or integral with, the base layer of insulation material.
  • the one or more heating elements may be of wire, ribbon or lamp form, or combinations thereof.
  • the dish-like support may comprise a metal.
  • a radiant electric heater is constructed for use, for example, in a cooking appliance such as the base of a deep fat fryer.
  • the heater comprises a metal dish-like support 1 containing a base layer 2 of microporous thermal and electrical insulation material.
  • One or more radiant electrical heating elements 3 is or are provided in the dish-like support 1.
  • a heating element comprises a metal ribbon secured edgewise on the surface of the base layer 2.
  • other forms of heating element could be considered, such as coiled wire or lamp elements. Combinations of elements could be provided.
  • a terminal block 4 is provided at the edge of the heater for connecting the heating element or elements 3 to a voltage supply.
  • a peripheral wall 5 of thermal insulation material of well known form is provided at the edge of the heater.
  • the peripheral wall 5 is shown as separate from the base layer 2, but could be provided integral therewith.
  • the heater is arranged for operation behind or beneath a protective metal grid or mesh means 6 which is arranged to overlie the top surface of the peripheral wall 5, or at least in a plane defined substantially by the top surface of the peripheral wall.
  • the metal grid or mesh means 6 may sag and contact, or approach undesirably close to, the heating element or elements 3. This is dangerous and must be avoided.
  • At least one spacer means 7 is provided cooperating between the metal grid or mesh means 6 and the base layer 2. As shown in the accompanying drawings, a single spacer means 7 is provided located substantially in a central region of the heater. However a plurality of spacer means could be provided if desired.
  • the spacer means 7 comprises an upstanding boss, peg or pillar, preferably of ceramic although it could be of metal.
  • the spacer means 7 is secured in the base layer 2 and contacts, and is optionally secured to, the metal grid or mesh means 6, thereby preventing the latter from sagging during operation of the heater.
  • the base layer 2 of microporous insulation material may be formed by moulding particulate microporous insulation material into the metal dish 1 and the spacer means 7 may be advantageously simultaneously moulded into the base layer 2, that is, it is co-moulded with the base layer 2.
  • the spacer means 7 may be arranged to contact, and optionally be secured to, the base of the metal dish-like support 1, as shown by the dotted outline 7A in Figure 2.

Landscapes

  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)
  • Electric Stoves And Ranges (AREA)
EP99300056A 1998-01-22 1999-01-05 Elément de chauffage électrique rayonnant Withdrawn EP0932326A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9801241A GB2333679B (en) 1998-01-22 1998-01-22 Radiant electric heater
GB9801241 1998-01-22

Publications (2)

Publication Number Publication Date
EP0932326A2 true EP0932326A2 (fr) 1999-07-28
EP0932326A3 EP0932326A3 (fr) 2000-03-22

Family

ID=10825629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99300056A Withdrawn EP0932326A3 (fr) 1998-01-22 1999-01-05 Elément de chauffage électrique rayonnant

Country Status (2)

Country Link
EP (1) EP0932326A3 (fr)
GB (1) GB2333679B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE691112C (de) * 1937-04-21 1940-05-18 Siemens Schuckertwerke Akt Ges Elektrische Gluehkochplatte
DE941004C (de) * 1933-02-14 1956-03-29 Edwin Henry Coe Elektrische Heizeinrichtung hoher Heizleistung, insbesondere elektrisch beheizte Kochplatte
US3838249A (en) * 1972-04-21 1974-09-24 Siemens Elektrogeraete Gmbh Cooking tray
US3895216A (en) * 1974-09-30 1975-07-15 Gen Electric Low thermal mass solid plate surface heating unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170590B (en) * 1985-01-31 1988-03-30 Thorn Emi Appliances Cooking apparatus
GB9104689D0 (en) * 1991-03-06 1991-04-17 Electrolux Cookers Improvements in and relating to electrically powered cooking grills

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE941004C (de) * 1933-02-14 1956-03-29 Edwin Henry Coe Elektrische Heizeinrichtung hoher Heizleistung, insbesondere elektrisch beheizte Kochplatte
DE691112C (de) * 1937-04-21 1940-05-18 Siemens Schuckertwerke Akt Ges Elektrische Gluehkochplatte
US3838249A (en) * 1972-04-21 1974-09-24 Siemens Elektrogeraete Gmbh Cooking tray
US3895216A (en) * 1974-09-30 1975-07-15 Gen Electric Low thermal mass solid plate surface heating unit

Also Published As

Publication number Publication date
GB2333679B (en) 2002-02-13
GB2333679A (en) 1999-07-28
EP0932326A3 (fr) 2000-03-22
GB9801241D0 (en) 1998-03-18

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