WO2007125299A1 - Arrangement of radiant electric heaters - Google Patents

Arrangement of radiant electric heaters Download PDF

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Publication number
WO2007125299A1
WO2007125299A1 PCT/GB2007/001484 GB2007001484W WO2007125299A1 WO 2007125299 A1 WO2007125299 A1 WO 2007125299A1 GB 2007001484 W GB2007001484 W GB 2007001484W WO 2007125299 A1 WO2007125299 A1 WO 2007125299A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
shoulder
heater
peripheral portion
supporting dish
Prior art date
Application number
PCT/GB2007/001484
Other languages
French (fr)
Inventor
Kevin David Roberts
Original Assignee
Ceramaspeed Limited
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 Limited filed Critical Ceramaspeed Limited
Publication of WO2007125299A1 publication Critical patent/WO2007125299A1/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
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • This invention relates to an arrangement of radiant electric heaters in which a plurality of heaters are arranged in a stack.
  • the heater It is conventional with radiant electric heaters for glass ceramic top cookers to provide the heater with a dish of suitable material, such as metal, the dish being formed with a shoulder at a lower peripheral edge thereof so as to form a recess having an upper surface at a level above a plane of a lower surface of the dish and a peripheral surface set back from a periphery of the heater.
  • Such recess is generally provided with an array of through-holes in the upper surface thereof so as to facilitate the mounting of components of the heater, such as a temperature-limiting device, and accessories and to provide a means for mounting the heater in an electric cooker.
  • each heater In order to transport the heaters from a heater manufacturer to an electric cooker manufacturer, it is conventional to provide packaging for each heater in the form of cardboard or the like which generally extends beneath the heater and around the sides thereof to a sufficient height to allow similarly packaged heaters to be stacked one on top of another.
  • each radiant heater comprising: a supporting dish having a substantially planar base and an upstanding peripheral portion and a shoulder formed around a junction between the base and the peripheral portion, the shoulder comprising an upper surface extending radially inwardly from the peripheral portion of the supporting dish and a peripheral surface extending between an inner edge of the upper surface and an outer edge of the substantially planar base; a base layer of thermal insulation material provided in the supporting dish; a heating element supported relative to the base layer of thermal insulation material; a peripheral wall of thermal insulation material extending around an inner side of the peripheral portion of the supporting dish; and a temperature-responsive device extending through the peripheral portion of the supporting dish and at least partly across the heater,
  • the temperature-responsive device is attached to an outer side of the peripheral portion of the supporting dish in such a manner that the temperature- responsive device does not extend below the upper surface of the shoulder and does not extend above the peripheral wall, and the radial extent of the upper surface of the shoulder is greater than the radial extent of the peripheral wall, whereby the peripheral surface of the shoulder of an upper heater fits within the peripheral wall of a lower heater with the upper surface of the shoulder of the upper heater being supported on an upper surface of the peripheral wall of the lower heater.
  • the upper surface of the shoulder may extend substantially parallel to the plane of the substantially planar base.
  • the supporting dish may comprise metal.
  • the base layer of thermal insulation material may comprise compressed microporous thermal and electrical insulation material.
  • the arrangement may include an array of through holes provided in the upper surface of the shoulder.
  • the heating element may be selected from a corrugated ribbon embedded edgewise in the base layer, a helical coil of resistance wire and a halogen lamp.
  • the peripheral wall may be selected from compacted vermiculite and compressed microporous material.
  • the peripheral wall may extend a short distance above an upper edge of the peripheral portion of the supporting dish.
  • the temperature-responsive device may be selected from a differential expansion device and a PRT device.
  • the temperature-responsive device may be secured to the supporting dish by way of a mounting plate.
  • the mounting plate may be arcuate.
  • the mounting plate may be provided with a plurality of hooks for engaging with the peripheral portion of the supporting dish.
  • the mounting plate may be formed with at least one aperture for a threaded fastener.
  • the lower edge of the mounting plate may not extend below the peripheral portion of the supporting dish.
  • the upper edge of the mounting plate may not extend above the upper edge of the peripheral portion of the supporting dish.
  • the temperature-responsive device may incorporate a temperature probe which is at a level below the upper surface of the peripheral wall of the lower heater by a greater distance than the height of the peripheral surface of the shoulder of the upper heater.
  • FIG. 1 is a cross-sectional view through a part of a stack of radiant electric heaters in accordance with the present invention.
  • the figure shows a stack of radiant electric heaters 1. Three heaters are shown for the purpose of illustration, although the actual number of stacked heaters will generally be more than three, and only part of each heater is shown, the left- hand part of each heater being essentially a mirror image of the right-hand-part but without a temperature-limiting device.
  • Each heater comprises a supporting dish 3, for example of metal, in which there is arranged a base layer 5 of thermal insulation material, such as compressed microporous thermal and electrical insulation material.
  • the supporting dish 3 has an upstanding peripheral portion 11 and a substantially planar base 13.
  • the supporting dish 3 is formed with a shoulder 25 at a lower edge of the upstanding peripheral portion 1 1 of the dish so as to form a recess having an upper surface at a level above the plane of the substantially planar base 13 of the dish and a peripheral surface set back from a peripheral portion 11 of the dish.
  • Such recess is generally provided with an array of through-holes in the upper surface thereof so as to provide a means for mounting the heater in an electric cooker.
  • a heating element 7 is supported relative to the base layer 5 of thermal insulation material.
  • the heating element 7 comprises a corrugated ribbon of electrical resistance material embedded edgewise into the base layer 5 of thermal insulation material.
  • the heating element may comprise a helical coil of resistance wire, a halogen lamp or any other conventional heating element.
  • a peripheral wall 9 of thermal insulation material extends around the inner side of the peripheral portion 11 of the supporting dish 3.
  • the peripheral wall 9 may be made of compacted vermiculite, compressed microporous material or other suitable material.
  • the peripheral wall 9 extends a short distance above the upper edge of the peripheral portion 11 of the supporting dish 3.
  • a temperature-responsive device 15 mounted to the external side of the peripheral portion 11 of the supporting dish 3 is a temperature-responsive device 15 of conventional type, such as a differential expansion device as illustrated or a PRT device.
  • the illustrated temperatu re-responsive device 15 includes a temperature probe 17 which extends at least partly over the heating element 7 and a switch head 19 located externally of the supporting dish 3.
  • the temperature-responsive device 15 is secured to the external side of the peripheral portion of the supporting dish 3 by way of an arcuate mounting plate 21 which is formed with a pair of hooks which engage with the peripheral portion 11 of the supporting dish 3 and with at least one aperture for a threaded fastener 23.
  • the mounting plate 21 is dimensioned such that the lower edge thereof does not protrude below the peripheral portion of the supporting dish 3 and such that the upper edge thereof does not protrude above the upper edge of the peripheral portion 11 of the dish.
  • the upper surface of the shoulder 25 extends radially inwardly by a distance greater than the radial thickness of the peripheral wall 9, while the temperature probe 17 of the temperature-responsive device 15 is arranged at a level below the upper edge of the peripheral wall 9 by a distance greater than the height of the peripheral surface of the shoulder 25. That is, the radial extent of the shoulder 25 is greater than it would conventionally be.
  • Such an arrangement allows the heaters to be stacked with the peripheral surface of the shoulder 25 of an upper heater fitting within the peripheral wall 9 of a lower heater, and the upper surface of the shoulder 25 of the upper heater supported by an upper surface of the peripheral wall 9 of the lower heater, while the substantially planar base 13 of the upper heater is spaced above the temperature probe 17 of the lower heater.
  • the temperature-responsive device 15 is mounted to the peripheral portion 11 of the supporting dish 3 and not to the upper surface of the shoulder 25 as in known heaters, the mounting plate 21 of the temperature-responsive device 15 of the upper heater does not interfere with the upper surface of the peripheral wall 9 of the lower heater.
  • the present invention in which radiant electric heaters can be stacked directly one on top of another allows for a denser packing arrangement than has hitherto be possible, while at the same time reducing the amount of packaging materials required.
  • the upper surface of the recess 25 may still be provided with an array of through holes (not shown) for example for the attachment of accessories after delivery to an appliance manufacturer and/or to facilitate mounting the heater in an electric cooker, but such through holes are not used for mounting the temperature-responsive device.

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

Abstract

A plurality of radiant electric heaters (1) are stacked one on top of another. Each heater (1) incorporates a temperature-responsive device (15) attached to an outer side of a peripheral portion (11) of a supporting dish (3) of the heater in such a manner that the temperature-responsive device does not extend below the upper surface of a shoulder (25) formed around a junction between the peripheral portion (11) and a substantially planar base (13) of the supporting dish (3) and does not extend above a peripheral wall of thermal insulation material which extends around an inner surface of the peripheral portion. The radial extent of an upper surface of the shoulder (25) is greater than the radial extent of the peripheral wall (9) such that a peripheral surface of the shoulder (25) of an upper heater (1) fits within the peripheral wall (9) of a lower heater (1) with the upper surface of the shoulder (25) of the upper heater (1) being supported on an upper surface of the peripheral wall (9) of the lower heater (1).

Description

ARRANGEMENT OF RADIANT ELECTRIC HEATERS
This invention relates to an arrangement of radiant electric heaters in which a plurality of heaters are arranged in a stack.
It is conventional with radiant electric heaters for glass ceramic top cookers to provide the heater with a dish of suitable material, such as metal, the dish being formed with a shoulder at a lower peripheral edge thereof so as to form a recess having an upper surface at a level above a plane of a lower surface of the dish and a peripheral surface set back from a periphery of the heater. Such recess is generally provided with an array of through-holes in the upper surface thereof so as to facilitate the mounting of components of the heater, such as a temperature-limiting device, and accessories and to provide a means for mounting the heater in an electric cooker.
In order to transport the heaters from a heater manufacturer to an electric cooker manufacturer, it is conventional to provide packaging for each heater in the form of cardboard or the like which generally extends beneath the heater and around the sides thereof to a sufficient height to allow similarly packaged heaters to be stacked one on top of another.
Such an arrangement ensures that the heaters are protected from each other, but is wasteful of materials in that the cardboard packaging must be disposed of or recycled.
It is therefore an object of the present invention to provide an arrangement of radiant electric heaters which overcomes or at least ameliorates the above disadvantage.
According to the present invention there is provided an arrangement of radiant electric heaters stacked one on top of another, each radiant heater comprising: a supporting dish having a substantially planar base and an upstanding peripheral portion and a shoulder formed around a junction between the base and the peripheral portion, the shoulder comprising an upper surface extending radially inwardly from the peripheral portion of the supporting dish and a peripheral surface extending between an inner edge of the upper surface and an outer edge of the substantially planar base; a base layer of thermal insulation material provided in the supporting dish; a heating element supported relative to the base layer of thermal insulation material; a peripheral wall of thermal insulation material extending around an inner side of the peripheral portion of the supporting dish; and a temperature-responsive device extending through the peripheral portion of the supporting dish and at least partly across the heater,
wherein the temperature-responsive device is attached to an outer side of the peripheral portion of the supporting dish in such a manner that the temperature- responsive device does not extend below the upper surface of the shoulder and does not extend above the peripheral wall, and the radial extent of the upper surface of the shoulder is greater than the radial extent of the peripheral wall, whereby the peripheral surface of the shoulder of an upper heater fits within the peripheral wall of a lower heater with the upper surface of the shoulder of the upper heater being supported on an upper surface of the peripheral wall of the lower heater.
The upper surface of the shoulder may extend substantially parallel to the plane of the substantially planar base.
The supporting dish may comprise metal. The base layer of thermal insulation material may comprise compressed microporous thermal and electrical insulation material.
The arrangement may include an array of through holes provided in the upper surface of the shoulder. The heating element may be selected from a corrugated ribbon embedded edgewise in the base layer, a helical coil of resistance wire and a halogen lamp.
The peripheral wall may be selected from compacted vermiculite and compressed microporous material.
The peripheral wall may extend a short distance above an upper edge of the peripheral portion of the supporting dish.
The temperature-responsive device may be selected from a differential expansion device and a PRT device.
The temperature-responsive device may be secured to the supporting dish by way of a mounting plate. The mounting plate may be arcuate. The mounting plate may be provided with a plurality of hooks for engaging with the peripheral portion of the supporting dish. The mounting plate may be formed with at least one aperture for a threaded fastener. The lower edge of the mounting plate may not extend below the peripheral portion of the supporting dish. The upper edge of the mounting plate may not extend above the upper edge of the peripheral portion of the supporting dish.
The temperature-responsive device may incorporate a temperature probe which is at a level below the upper surface of the peripheral wall of the lower heater by a greater distance than the height of the peripheral surface of the shoulder of the upper heater.
For a better understanding of the present invention and to show more clearly how it may be carried into effect reference will now be made, byway of example, to the accompanying figure which is a cross-sectional view through a part of a stack of radiant electric heaters in accordance with the present invention. The figure shows a stack of radiant electric heaters 1. Three heaters are shown for the purpose of illustration, although the actual number of stacked heaters will generally be more than three, and only part of each heater is shown, the left- hand part of each heater being essentially a mirror image of the right-hand-part but without a temperature-limiting device.
Each heater comprises a supporting dish 3, for example of metal, in which there is arranged a base layer 5 of thermal insulation material, such as compressed microporous thermal and electrical insulation material. The supporting dish 3 has an upstanding peripheral portion 11 and a substantially planar base 13. The supporting dish 3 is formed with a shoulder 25 at a lower edge of the upstanding peripheral portion 1 1 of the dish so as to form a recess having an upper surface at a level above the plane of the substantially planar base 13 of the dish and a peripheral surface set back from a peripheral portion 11 of the dish. Such recess is generally provided with an array of through-holes in the upper surface thereof so as to provide a means for mounting the heater in an electric cooker.
A heating element 7 is supported relative to the base layer 5 of thermal insulation material. For example, as illustrated the heating element 7 comprises a corrugated ribbon of electrical resistance material embedded edgewise into the base layer 5 of thermal insulation material. Alternatively, the heating element may comprise a helical coil of resistance wire, a halogen lamp or any other conventional heating element. A peripheral wall 9 of thermal insulation material extends around the inner side of the peripheral portion 11 of the supporting dish 3. The peripheral wall 9 may be made of compacted vermiculite, compressed microporous material or other suitable material. The peripheral wall 9 extends a short distance above the upper edge of the peripheral portion 11 of the supporting dish 3.
Mounted to the external side of the peripheral portion 11 of the supporting dish 3 is a temperature-responsive device 15 of conventional type, such as a differential expansion device as illustrated or a PRT device. The illustrated temperatu re-responsive device 15 includes a temperature probe 17 which extends at least partly over the heating element 7 and a switch head 19 located externally of the supporting dish 3. The temperature-responsive device 15 is secured to the external side of the peripheral portion of the supporting dish 3 by way of an arcuate mounting plate 21 which is formed with a pair of hooks which engage with the peripheral portion 11 of the supporting dish 3 and with at least one aperture for a threaded fastener 23. The mounting plate 21 is dimensioned such that the lower edge thereof does not protrude below the peripheral portion of the supporting dish 3 and such that the upper edge thereof does not protrude above the upper edge of the peripheral portion 11 of the dish.
The upper surface of the shoulder 25 extends radially inwardly by a distance greater than the radial thickness of the peripheral wall 9, while the temperature probe 17 of the temperature-responsive device 15 is arranged at a level below the upper edge of the peripheral wall 9 by a distance greater than the height of the peripheral surface of the shoulder 25. That is, the radial extent of the shoulder 25 is greater than it would conventionally be. Such an arrangement allows the heaters to be stacked with the peripheral surface of the shoulder 25 of an upper heater fitting within the peripheral wall 9 of a lower heater, and the upper surface of the shoulder 25 of the upper heater supported by an upper surface of the peripheral wall 9 of the lower heater, while the substantially planar base 13 of the upper heater is spaced above the temperature probe 17 of the lower heater. Similarly, because the temperature-responsive device 15 is mounted to the peripheral portion 11 of the supporting dish 3 and not to the upper surface of the shoulder 25 as in known heaters, the mounting plate 21 of the temperature-responsive device 15 of the upper heater does not interfere with the upper surface of the peripheral wall 9 of the lower heater.
Thus the present invention in which radiant electric heaters can be stacked directly one on top of another allows for a denser packing arrangement than has hitherto be possible, while at the same time reducing the amount of packaging materials required. The upper surface of the recess 25 may still be provided with an array of through holes (not shown) for example for the attachment of accessories after delivery to an appliance manufacturer and/or to facilitate mounting the heater in an electric cooker, but such through holes are not used for mounting the temperature-responsive device.

Claims

1. An arrangement of radiant electric heaters (1 ) stacked one on top of another, each radiant heater comprising: a supporting dish (3) having a substantially planar base (13) and an upstanding peripheral portion (11) and a shoulder (25) formed around a junction between the base and the peripheral portion, the shoulder comprising an upper surface extending radially inwardly from the peripheral portion of the supporting dish and a peripheral surface extending between an inner edge of the upper surface and an outer edge of the substantially planar base; a base layer (5) of thermal insulation material provided in the supporting dish (3); a heating element (7) supported relative to the base layer (5) of thermal insulation material; a peripheral wall (9) of thermal insulation material extending around an inner side of the peripheral portion (11) of the supporting dish (3); and a temperature-responsive device (15) extending through the peripheral portion of the supporting dish and at least partly across the heater,
characterised in that the temperature-responsive device (15) is attached to an outer side of the peripheral portion (11) of the supporting dish (3) in such a mannerthat the temperature-responsive device does not extend belowthe upper surface of the shoulder (25) and does not extend above the peripheral wall (9), and the radial extent of the upper surface of the shoulder (25) is greater than the radial extent of the peripheral wall (9), whereby the peripheral surface of the shoulder of an upper heater fits within the peripheral wall of a lower heater with the upper surface of the shoulder of the upper heater being supported on an upper surface of the peripheral wall of the lower heater.
2. An arrangement as claimed in claim 1 , characterised in that the upper surface of the shoulder (25) extends substantially parallel to the plane of the substantially planar base (13).
3. An arrangement as claimed in claim 1 or 2, characterised in that the supporting dish (3) comprises metal.
4. An arrangement as claimed in claim 1 , 2 or 3, characterised in that the base layer (5) of thermal insulation material comprises compressed microporous thermal and electrical insulation material.
5. An arrangement as claimed in any preceding claim, characterised in that the arrangement includes an array of through holes provided in the upper surface of the shoulder (25).
6. An arrangement as claimed in any preceding claim, characterised in that the heating element (7) is selected from a corrugated ribbon embedded edgewise in the base layer, a helical coil of resistance wire and a halogen lamp.
7. An arrangement as claimed in any preceding claim, characterised in that the peripheral wall (9) is selected from compacted vermiculite and compressed microporous material.
8. An arrangement as claimed in any preceding claim, characterised in that the peripheral wall (9) extends a short distance above an upper edge of the peripheral portion (11) of the supporting dish (3).
9. An arrangement as claimed in any preceding claim, characterised in that the temperature-responsive device (15) is selected from a differential expansion device and a PRT device.
10. An arrangement as claimed in any preceding claim, characterised in that the temperature-responsive device (15) is secured to the supporting dish (3) by way of a mounting plate (21).
11. An arrangement as claimed in claim 10, characterised in that the mounting plate (21 ) is arcuate.
12. An arrangement as claimed in claim 10 or 11 , characterised in that the mounting plate (21 ) is provided with a plurality of hooks for engaging with the peripheral portion (11) of the supporting dish (3).
13. An arrangement as claimed in claim 10, 11 or 12, characterised in that the mounting plate (21 ) is formed with at least one aperture for a threaded fastener (23).
14. An arrangement as claimed in any one of claims 10 to 13, characterised in that the lower edge of the mounting plate (21 ) does not extend below the peripheral portion (11) of the supporting dish (3).
15. An arrangement as claimed in any one of claims 10 to 14, characterised in that the upper edge of the mounting plate (21 ) does not extend above the upper edge of the peripheral portion (11 ) of the supporting dish (3).
16. An arrangement as claimed in any preceding claim, characterised in that the temperature-responsive device (15) incorporates a temperature probe (17) which is at a level below the upper surface of the peripheral wall (9) of the lower heater by a greater distance than the height of the peripheral surface of the shoulder (25) of the upper heater.
PCT/GB2007/001484 2006-04-29 2007-04-23 Arrangement of radiant electric heaters WO2007125299A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0608522A GB0608522D0 (en) 2006-04-29 2006-04-29 Arrangement of radiant electric heaters
GB0608522.9 2006-04-29

Publications (1)

Publication Number Publication Date
WO2007125299A1 true WO2007125299A1 (en) 2007-11-08

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WO (1) WO2007125299A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542142A2 (en) * 1991-11-12 1993-05-19 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Radiant heating unit
DE4438648A1 (en) * 1994-10-28 1996-05-02 Ego Elektro Blanc & Fischer Radiant heater
EP1139696A2 (en) * 2000-03-23 2001-10-04 Ceramaspeed Limited Radiant electric heater
US20020121510A1 (en) * 2000-09-07 2002-09-05 Heinz Petri Radiant heater
WO2002102115A1 (en) * 2001-06-08 2002-12-19 Ceramaspeed Limited Radiant electric heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542142A2 (en) * 1991-11-12 1993-05-19 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Radiant heating unit
US5489764A (en) * 1991-11-12 1996-02-06 E.G.O. Electro-Gerate Blanc U Fischer Radiant heating cook-top with biased temperature sensor
DE4438648A1 (en) * 1994-10-28 1996-05-02 Ego Elektro Blanc & Fischer Radiant heater
EP1139696A2 (en) * 2000-03-23 2001-10-04 Ceramaspeed Limited Radiant electric heater
US20020121510A1 (en) * 2000-09-07 2002-09-05 Heinz Petri Radiant heater
WO2002102115A1 (en) * 2001-06-08 2002-12-19 Ceramaspeed Limited Radiant electric heater

Also Published As

Publication number Publication date
GB0608522D0 (en) 2006-06-07

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