GB2374787A - Radiant electric heater - Google Patents

Radiant electric heater Download PDF

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Publication number
GB2374787A
GB2374787A GB0200274A GB0200274A GB2374787A GB 2374787 A GB2374787 A GB 2374787A GB 0200274 A GB0200274 A GB 0200274A GB 0200274 A GB0200274 A GB 0200274A GB 2374787 A GB2374787 A GB 2374787A
Authority
GB
United Kingdom
Prior art keywords
electric heater
radiant electric
end portions
heating element
oven
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Withdrawn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
GB0200274A
Other versions
GB0200274D0 (en
Inventor
Gavin John Coleman
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
Priority claimed from GB0101645A external-priority patent/GB0101645D0/en
Priority claimed from GB0106699A external-priority patent/GB0106699D0/en
Application filed by Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Publication of GB0200274D0 publication Critical patent/GB0200274D0/en
Publication of GB2374787A publication Critical patent/GB2374787A/en
Withdrawn legal-status Critical Current

Links

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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • 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
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout
    • 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
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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
    • 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
    • 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
    • H05B2203/037—Heaters with zones of different power density

Abstract

A radiant electric heater (2; 24) for use in a cavity of an oven (18), the heater comprising a base layer (6; 28) of thermal and electrical insulating material and a heating element (8; 30) supported on the base layer. The heating element (8; 30) is of overall elongate form with first and second end portions (12, 14; 34, 36) and an intermediate portion (16; 38) interconnecting the end portions. The end portions (12, 14; 34, 36) are adapted and constructed to generate greater heat intensity than the interconnecting portion (16; 38).

Description

<Desc/Clms Page number 1>
RADIANT ELECTRIC HEATER The present invention relates to a radiant electric heater for an oven and to an oven incorporating such a radiant electric heater.
When a radiant electric heater is used in a cavity of an oven, uniform heating provided by the heater does not result in uniform heating of the cavity and hence of an item, such as food, located therein. This is as a result of air flow and heat losses of various parts of the oven.
In particular, heat losses occur at unheated boundaries of the oven cavity, resulting in lower temperatures in the vicinity thereof.
It is an object of the present invention to overcome or minimise this problem.
According to the present invention there is provided a radiant electric heater for use in a cavity of an oven, the heater comprising a base layer of thermal and electrical insulating material and a heating element supported on the base layer, the heating element being of overall elongate form with first and second end portions and an intermediate portion interconnecting the end portions, wherein the end portions are adapted and
<Desc/Clms Page number 2>
constructed to generate greater heat intensity than the interconnecting portion.
The first and second end portions may be of a first width and the interconnecting portion of a second width, the first width being greater than the second width.
The heating element may be of overall waisted form.
Alternatively, the heating element may be of overall substantially rectangular form.
The power density at the first and second end portions may be from 3.5 to 5.5 watts per square centimetre and the power density at the interconnecting portion may be from 2.2 to 4.2 watts per square centimetre.
The power density at the first and second end portions may be about 4.5 watts per square centimetre and the power density at the interconnecting portion may be about 2.7 watts per square centimetre.
The heating element may comprise at least one meandering electrical conductor, which may be of ribbon, wire or foil form.
<Desc/Clms Page number 3>
The base layer of thermal and electrical insulating material may comprise microporous insulating material.
The base layer of thermal insulating material may be provided in a dish-like support, such as of metal, which may be of substantially rectangular shape.
The present invention also provides an oven having a cavity incorporating the radiant electric heater.
The heater may be mounted in a wall of the cavity, such as a top wall, side wall or rear wall thereof.
With the radiant electric heater of the invention, greater heat is radiated from the first and second end portions of the heating element than from the interconnecting portion, with the result that cooler boundary regions of an oven receive more heat than central regions of the oven. More uniform cooking or heating of food in the oven results.
For a better understanding of the invention and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings in which:
<Desc/Clms Page number 4>
Figure 1 is a plan view of one embodiment of a radiant electric heater according to the present invention; Figure 2 is a representation of an oven incorporating the heater of Figure 1; and Figure 3 is a plan view of an alternative embodiment of a radiant electric heater according to the present invention.
Referring to Figure 1, a radiant electric heater 2, for use in an oven, has a dish-like metal support 4 containing a base layer 6 of thermal and electrical insulating material, such as compacted microporous thermal and electrical insulating material. An electric heating element 8 is supported on the base layer 6 of insulation material and electrically connected to a terminal block 10 for energising from a power supply (not shown).
The heating element 8 consists of meandering electrical conductor material which can comprise any of the well known forms of element material, such as wire, ribbon or foil. In particular, the heating element 8 comprises a meandering corrugated ribbon supported edgewise on the base layer 6 of insulating material.
<Desc/Clms Page number 5>
The heating element 8. is of overall elongate form and has opposite first and second end portions 12 and 14, each of a first width Wl, and an interconnecting portion 16 of a second width W2. The width Wl of the opposite end portions 12,14 is greater than the width W2 of the interconnecting portion 16.
The heating element 8 is of overall waisted form, with the end portions 12,14 directly opposite each other and with the portion 16 forming an interconnecting waistshaped region therebetween.
As a result of the overall shape of the heating element 8 in the heater 2, greater heat is radiated from the opposite end portions 12,14 of the element than from the interconnecting portion 16 of the element. This is advantageous when the heater is provided for heating the cavity of an oven, as illustrated in Figure 2.
Referring to Figure 2, an oven 18 has a cavity 20 and the heater 2 of Figure 1 is located at a wall of the cavity and radiates heat into the cavity. The wall may be, for example, a top, side or rear wall of the cavity. Heat losses occur at the region of walls 22 of the cavity and if a heater were to be used in the oven which provided uniform radiant heat therefrom into the cavity 20, non-
<Desc/Clms Page number 6>
uniform heating of the cavity would result. This would mean that food located in the oven near the walls 22 would be cooked less than corresponding food located at a central region of the oven cavity 20.
This problem is overcome by the heater 2 of the present invention. Because the opposite end portions 12,14 provide greater radiated heat than the interconnecting portion 16, the regions of the oven cavity 20 near the walls 22 receive more heat than the central region of the oven cavity 20. This results in more uniform heating throughout the oven cavity 20 and hence more uniform heating of food therein.
Figure 3 shows an alternative embodiment of a radiant electric heater according to the present invention. A radiant electric heater 24, for use in an oven such as the oven 18 of Figure 2, has a dish-like metal support 26 containing a base layer 28 of thermal and electrical insulating material, such as compacted microporous thermal insulating material. An electric heating element 30 is supported on the base layer 28 of insulating material and electrically connected to a terminal block 32 for energising from a power supply (not shown).
<Desc/Clms Page number 7>
The heating element 3D consists of meandering electrical conductor material which can comprise any of the wellknown forms of element material, such as wire, ribbon or foil. In particular, the heating element 30 comprises a meandering corrugated ribbon, supported edgewise on the base layer 28 of insulating material.
The heating element 30 is of overall substantially rectangular elongate form and has opposite end portions 34 and 36 and an interconnecting portion 38. The opposite end portions 34 and 36 of the heating element 30 each have a power density which is greater than a corresponding power density at the interconnecting portion 38. By way of example, the power density at each of the end portions 34 and 36 is from 3.5 to 5.5 watts per square centimetre and the power density at the interconnecting portion 38 is from 2.2 to 4.2 watts per square centimetre. In a specific example, the power density at each of the end portions 34 and 36 is about 4.5 watts per square centimetre and the power density at the interconnecting portion is about 2.7 watts per square centimetre.
The greater power density at the end portions 34 and 36 is suitably provided by closer spaced relationship between adjacent heating element conductors in these
<Desc/Clms Page number 8>
portions compared with relatively wider spaced relationship between corresponding heating element conductors in the interconnecting portion 38.
As a result of the greater power density at the end portions 34 and 36 of the heating element 30, relative to the power density at the interconnecting portion 38, greater heat is radiated from the opposite end portions 34 and 36 of the element than from the interconnecting portion 38 of the element.
When the heater 24 is installed in the cavity of an oven, such as the oven 18 of Figure 2, regions of the oven cavity near the walls receive more heat than the central region of the oven cavity. This results in more uniform heating throughout the oven cavity and hence more uniform heating of food therein.

Claims (15)

  1. CLAIMS 1. A radiant electric heater for use in a cavity of an oven, the heater comprising a base layer of thermal and electrical insulating material and a heating element supported on the base layer, the heating element being of overall elongate form with first and second end portions and an intermediate portion interconnecting the end portions, wherein the end portions are adapted and constructed to generate greater heat intensity than the interconnecting portion.
  2. 2. A radiant electric heater as claimed in claim 1, wherein the first and second end portions are of a first width and the interconnecting portion of a second width, the first width being greater than the second width.
  3. 3. A radiant electric heater as claimed in claim 1 or 2, wherein the heating element is of overall waisted form.
  4. 4. A radiant electric heater as claimed in claim 1 or 2, wherein the heating element is of overall substantially rectangular form.
    <Desc/Clms Page number 10>
  5. 5. A radiant electric heater as claimed in any preceding claim, wherein the power density at the first and second end portions is from 3.5 to 5.5 watts per square centimetre and the power density at the interconnecting portion is from 2.2 to 4.2 watts per square centimetre.
  6. 6. A radiant electric heater as claimed in claim 5, wherein the power density at the first and second end portions is about 4.5 watts per square centimetre and the power density at the interconnecting portion is about 2.7 watts per square centimetre.
  7. 7. A radiant electric heater as claimed in any preceding claim, wherein the heating element comprises at least one meandering electrical conductor.
  8. 8. A radiant electric heater as claimed in claim 7, wherein the heating element is selected from ribbon, wire and foil form.
  9. 9. A radiant electric heater as claimed in any preceding claim, wherein the base layer of thermal and electrical insulating material comprises microporous insulating material.
    <Desc/Clms Page number 11>
  10. 10. A radiant electric heater as claimed in any preceding claim, wherein the base layer of thermal insulating material is provided in a dish-like support.
  11. 11. A radiant electric heater as claimed in claim 10, wherein the dish-like support is of metal.
  12. 12. A radiant electric heater as claimed in claim 10 or 11, wherein the dish-like support is of substantially rectangular shape.
  13. 13. An oven having a cavity incorporating a radiant electric heater as claimed in any preceding claim.
  14. 14. An oven as claimed in claim 13, wherein the heater is mounted in a wall of the cavity.
  15. 15. An oven as claimed in claim 14, wherein the heater is mounted in a top wall, side wall or rear wall of the cavity.
GB0200274A 2001-01-23 2002-01-08 Radiant electric heater Withdrawn GB2374787A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0101645A GB0101645D0 (en) 2001-01-23 2001-01-23 Radiant electric heater
GB0106699A GB0106699D0 (en) 2001-03-19 2001-03-19 Radiant electric heater

Publications (2)

Publication Number Publication Date
GB0200274D0 GB0200274D0 (en) 2002-02-20
GB2374787A true GB2374787A (en) 2002-10-23

Family

ID=26245605

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0200274A Withdrawn GB2374787A (en) 2001-01-23 2002-01-08 Radiant electric heater

Country Status (2)

Country Link
DE (1) DE20201030U1 (en)
GB (1) GB2374787A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111466784A (en) * 2020-03-20 2020-07-31 广东美的厨房电器制造有限公司 Heating assembly and cooking device with same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785292A (en) *
GB684253A (en) * 1950-04-06 1952-12-17 Vickers Electrical Co Ltd Improvements relating to electric heaters
GB838775A (en) * 1955-04-23 1960-06-22 Simplex Electric Co Ltd Improvements relating to electrically heated cooking appliances
US5310979A (en) * 1991-12-03 1994-05-10 Samsung Electronics Co., Ltd. Microwave ovens with infrared rays heating units
EP0918448A2 (en) * 1997-11-20 1999-05-26 Ceramaspeed Limited Radiant electric heater
EP1083773A2 (en) * 1999-09-10 2001-03-14 Ceramaspeed Limited Radiant electric heater for a microwave oven
WO2002039785A1 (en) * 2000-11-10 2002-05-16 Ceramaspeed Limited Oven with cavity having turntable and heater

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785292A (en) *
GB684253A (en) * 1950-04-06 1952-12-17 Vickers Electrical Co Ltd Improvements relating to electric heaters
GB838775A (en) * 1955-04-23 1960-06-22 Simplex Electric Co Ltd Improvements relating to electrically heated cooking appliances
US5310979A (en) * 1991-12-03 1994-05-10 Samsung Electronics Co., Ltd. Microwave ovens with infrared rays heating units
EP0918448A2 (en) * 1997-11-20 1999-05-26 Ceramaspeed Limited Radiant electric heater
EP1083773A2 (en) * 1999-09-10 2001-03-14 Ceramaspeed Limited Radiant electric heater for a microwave oven
WO2002039785A1 (en) * 2000-11-10 2002-05-16 Ceramaspeed Limited Oven with cavity having turntable and heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111466784A (en) * 2020-03-20 2020-07-31 广东美的厨房电器制造有限公司 Heating assembly and cooking device with same
CN111466784B (en) * 2020-03-20 2022-04-29 广东美的厨房电器制造有限公司 Heating assembly and cooking device with same

Also Published As

Publication number Publication date
DE20201030U1 (en) 2002-04-04
GB0200274D0 (en) 2002-02-20

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)