WO2002039020A2 - Oven with cavity having turntable and heater - Google Patents

Oven with cavity having turntable and heater Download PDF

Info

Publication number
WO2002039020A2
WO2002039020A2 PCT/GB2001/004908 GB0104908W WO0239020A2 WO 2002039020 A2 WO2002039020 A2 WO 2002039020A2 GB 0104908 W GB0104908 W GB 0104908W WO 0239020 A2 WO0239020 A2 WO 0239020A2
Authority
WO
WIPO (PCT)
Prior art keywords
oven
heating element
turntable
substantially circular
power density
Prior art date
Application number
PCT/GB2001/004908
Other languages
French (fr)
Other versions
WO2002039020A3 (en
Inventor
Kevin Ronald Mcwilliams
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
Priority to GB0309363A priority Critical patent/GB2384553B/en
Priority to AU2002223785A priority patent/AU2002223785A1/en
Publication of WO2002039020A2 publication Critical patent/WO2002039020A2/en
Publication of WO2002039020A3 publication Critical patent/WO2002039020A3/en

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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • 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

Definitions

  • the present invention relates to an oven comprising an oven cavity provided with a turntable and further comprising a radiant electric heater.
  • Ovens such as microwave ovens are known, comprising an oven cavity having therein a rotatable turntable for supporting food to be heated. It is known to locate a radiant electric heater above the turntable for grilling, browning or baking the food on the turntable. Such a radiant heater is known to be located above a substantially semi-circular portion of the turntable, such that food on the rotating turntable passes under the heater.
  • a problem with such an arrangement is that food located near a peripheral region of the rotating turntable tends to be heated to a lesser degree than food located at, or near, a central region of the rotating turntable. This results in uneven cooking of the food. Furthermore, this problem is exacerbated by the fact that significant heat loss can occur at edge regions of a radiant heater with the result that there is a reduction in effective radiant heat energy from such a heater at peripheral regions thereof. It is an object of the present invention to overcome or minimise this problem.
  • an oven comprising an oven cavity provided therein with a rotatable turntable for supporting one or more items to be heated, and a radiant electric heater located above the turntable and incorporating at least one heating element, wherein the at least one heating element is of overall substantially circular form and overlies the turntable substantially concentric therewith such that an item to be heated in the oven is heated to substantially the same extent, when located on the turntable, substantially regardless of its position of location on the turntable.
  • the heater may be arranged to substantially completely overlie the turntable.
  • the heater may be of substantially circular form.
  • the at least one heating element may be adapted and arranged to have a power density at a substantially circular peripheral region thereof which is greater than a power density at a central region thereof.
  • the at least one heating element may be adapted and arranged whereby the power density at the substantially circular peripheral region thereof is from 110 to 140 percent, and preferably from 120 to 130 percent, of the power density at the central region thereof.
  • the power density of the at least one heating element at the substantially circular peripheral region thereof may be of the order of 5 watts per square centimetre and the power density of the heating element at the central region thereof may be of the order of 4 watts per square centimetre .
  • the at least one heating element may comprise spaced apart turns of elongate electrical conductor material having adjacent turns more closely spaced at the substantially circular peripheral region thereof than at the central region thereof.
  • the spaced apart turns of elongate electrical conductor material may be arranged in single or multiple spiral form.
  • Such multiple spiral form may be a double spiral form.
  • the at least one heating element may be of wire or ribbon form and may be supported on a base layer of electrical insulation material, such as microporous thermal and electrical insulation material.
  • the base layer of insulation material may be provided in a dish-like support, such as of metal, and which may be of substantially circular form.
  • a single heating element may be provided.
  • the oven may comprise a microwave oven.
  • an item such as a food item, supported on the rotatable turntable for heating by the radiant electric heater, is heated to a substantially similar degree regardless of where it is located on the turntable.
  • the arrangement of greater power density of the at least one heating element at the substantially circular peripheral region thereof, than at the central region thereof, may be used further to compensate for heat losses at the edge of the heater and at the edge of the turntable.
  • Figure 1 is a top plan view representation of one embodiment of an oven according to the present invention.
  • Figure 2 is a front view of a radiant heater forming part of the oven of Figure 1;
  • Figure 3 is a cross-sectional view of the heater of Figure 2.
  • an oven 2 such as a microwave oven, has a door 4 and is provided with an oven cavity 6.
  • a well known form of circular turntable 8 is provided in the oven cavity 6 and is arranged for rotation by well known means (not shown) .
  • the turntable 8 is intended for supporting one or more food items to be heated.
  • a radiant electric heater 10 is located at the top of the oven cavity 6, above the turntable 8 and substantially completely overlying the turntable 8.
  • the heater 10 comprises a substantially circular metal dish-like support 12 containing a base layer 14 of insulation material, such as well known microporous thermal and electrical insulation material.
  • An electrical heating element 16 of overall substantially circular form comprises spaced apart turns of elongate electrical conductor material arranged in the form of a double spiral.
  • the heating element 16 is supported on the base layer 14 of insulation material and is electrically connected to a terminal block 18 for energising from a power supply (not shown) .
  • the heating element 16 can comprise any of the well known forms of element material, such as wire or ribbon forms.
  • the heating element 16 comprises a corrugated metal ribbon supported edgewise on the base layer 14 of insulation material.
  • the heating element 16 is adapted and arranged to have a power density at a substantially circular peripheral region 20 thereof which is greater than a power density at a central region 22 thereof. This is achieved by providing adjacent turns 24 of the heating element 16 at the peripheral region 20 thereof which are more closely spaced than corresponding adjacent turns 26 of the heating element 16 at the central region thereof.
  • the provision of the substantially circular heating element 16 improves the uniformity of heating over the area of the turntable.
  • Food items 28, 30 located respectively at central and peripheral regions of the turntable 8 are heated to substantially the same extent by the heater 10.
  • the greater power density at the substantially circular peripheral region 20 of the heating element 16 is selected relative to that at the central region 22 of the heating element 16 to compensate for heat losses at the edge 32 of the heater 10 and at the edge of the underlying turntable 8.
  • the power density at the substantially circular peripheral region 20 of the heating element 16 may be from 110 to 140 percent, and preferably from 120 to 130 percent, of the corresponding power density at the central region 22 of the heating element 16.
  • the power density at the peripheral region 20 of the heating element 16 may be of the order of 5 watts per square centimetre whereas the corresponding power density at the central region 22 of the heating element 16 may be of the order of 4 watts per square centimetre.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

An oven (2), such as a microwave oven, comprises an oven cavity (6) having therein a rotatable turntable (8) for supporting one or more items (28, 30), such as food items, to be heated. A gradient electric heater (10) is located above the turntable (8) and incorporates at least one heating element (16) which is of overall substantially circular form and overlies the turntable substantially concentric therewith. Thus an item (28, 30) to be heated in the oven (2) is heated to substantially the same extent, when located on the turntable (8), substantially regardless of its position of location on the turntable. The at least one heating element (16) may have a power density at a substantially circular peripheral region (20) thereof which is greater than a power density at a central region (22) thereof.

Description

OVEN WITH CAVITY HAVING TURNTABLE AND HEATER
The present invention relates to an oven comprising an oven cavity provided with a turntable and further comprising a radiant electric heater.
Ovens such as microwave ovens are known, comprising an oven cavity having therein a rotatable turntable for supporting food to be heated. It is known to locate a radiant electric heater above the turntable for grilling, browning or baking the food on the turntable. Such a radiant heater is known to be located above a substantially semi-circular portion of the turntable, such that food on the rotating turntable passes under the heater.
A problem with such an arrangement is that food located near a peripheral region of the rotating turntable tends to be heated to a lesser degree than food located at, or near, a central region of the rotating turntable. This results in uneven cooking of the food. Furthermore, this problem is exacerbated by the fact that significant heat loss can occur at edge regions of a radiant heater with the result that there is a reduction in effective radiant heat energy from such a heater at peripheral regions thereof. It is an object of the present invention to overcome or minimise this problem.
According to the present invention there is provided an oven comprising an oven cavity provided therein with a rotatable turntable for supporting one or more items to be heated, and a radiant electric heater located above the turntable and incorporating at least one heating element, wherein the at least one heating element is of overall substantially circular form and overlies the turntable substantially concentric therewith such that an item to be heated in the oven is heated to substantially the same extent, when located on the turntable, substantially regardless of its position of location on the turntable.
The heater may be arranged to substantially completely overlie the turntable.
The heater may be of substantially circular form.
The at least one heating element may be adapted and arranged to have a power density at a substantially circular peripheral region thereof which is greater than a power density at a central region thereof. The at least one heating element may be adapted and arranged whereby the power density at the substantially circular peripheral region thereof is from 110 to 140 percent, and preferably from 120 to 130 percent, of the power density at the central region thereof.
The power density of the at least one heating element at the substantially circular peripheral region thereof may be of the order of 5 watts per square centimetre and the power density of the heating element at the central region thereof may be of the order of 4 watts per square centimetre .
The at least one heating element may comprise spaced apart turns of elongate electrical conductor material having adjacent turns more closely spaced at the substantially circular peripheral region thereof than at the central region thereof.
The spaced apart turns of elongate electrical conductor material may be arranged in single or multiple spiral form. Such multiple spiral form may be a double spiral form.
The at least one heating element may be of wire or ribbon form and may be supported on a base layer of electrical insulation material, such as microporous thermal and electrical insulation material. The base layer of insulation material may be provided in a dish-like support, such as of metal, and which may be of substantially circular form.
A single heating element may be provided.
The oven may comprise a microwave oven.
By means of the present invention, an item, such as a food item, supported on the rotatable turntable for heating by the radiant electric heater, is heated to a substantially similar degree regardless of where it is located on the turntable. This results from the provision of the at least one substantially circular heating element overlying the turntable. The arrangement of greater power density of the at least one heating element at the substantially circular peripheral region thereof, than at the central region thereof, may be used further to compensate for heat losses at the edge of the heater and at the edge of the turntable.
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: Figure 1 is a top plan view representation of one embodiment of an oven according to the present invention;
Figure 2 is a front view of a radiant heater forming part of the oven of Figure 1; and
Figure 3 is a cross-sectional view of the heater of Figure 2.
Referring to Figure 1, an oven 2, such as a microwave oven, has a door 4 and is provided with an oven cavity 6. A well known form of circular turntable 8 is provided in the oven cavity 6 and is arranged for rotation by well known means (not shown) . The turntable 8 is intended for supporting one or more food items to be heated.
A radiant electric heater 10 is located at the top of the oven cavity 6, above the turntable 8 and substantially completely overlying the turntable 8.
As particularly shown in Figures 2 and 3, the heater 10 comprises a substantially circular metal dish-like support 12 containing a base layer 14 of insulation material, such as well known microporous thermal and electrical insulation material. An electrical heating element 16 of overall substantially circular form comprises spaced apart turns of elongate electrical conductor material arranged in the form of a double spiral. The heating element 16 is supported on the base layer 14 of insulation material and is electrically connected to a terminal block 18 for energising from a power supply (not shown) .
The heating element 16 can comprise any of the well known forms of element material, such as wire or ribbon forms. In particular, the heating element 16 comprises a corrugated metal ribbon supported edgewise on the base layer 14 of insulation material.
In the illustrated embodiment the heating element 16 is adapted and arranged to have a power density at a substantially circular peripheral region 20 thereof which is greater than a power density at a central region 22 thereof. This is achieved by providing adjacent turns 24 of the heating element 16 at the peripheral region 20 thereof which are more closely spaced than corresponding adjacent turns 26 of the heating element 16 at the central region thereof.
The provision of the substantially circular heating element 16 improves the uniformity of heating over the area of the turntable. The provision of a greater power density at the peripheral region 20 of the heater as compared with its central region 22, results in the heater 10 providing even greater uniformity of heating over the entire surface of the underlying turntable 8. Food items 28, 30 located respectively at central and peripheral regions of the turntable 8 are heated to substantially the same extent by the heater 10.
The greater power density at the substantially circular peripheral region 20 of the heating element 16 is selected relative to that at the central region 22 of the heating element 16 to compensate for heat losses at the edge 32 of the heater 10 and at the edge of the underlying turntable 8. By way of example, the power density at the substantially circular peripheral region 20 of the heating element 16 may be from 110 to 140 percent, and preferably from 120 to 130 percent, of the corresponding power density at the central region 22 of the heating element 16. For example, the power density at the peripheral region 20 of the heating element 16 may be of the order of 5 watts per square centimetre whereas the corresponding power density at the central region 22 of the heating element 16 may be of the order of 4 watts per square centimetre.

Claims

1. An oven (2) comprising an oven cavity (6) provided therein with a rotatable turntable (8) for supporting one or more items (28, 30) to be heated, and a radiant electric heater (10) located above the turntable and incorporating at least one heating element (16) , characterised in that the at least one heating element is of overall substantially circular form and overlies the turntable (8) substantially concentric therewith such that an item (28, 30) to be heated in the oven is heated to substantially the same extent, when located on the turntable, regardless of its position of location on the turntable .
2. An oven as claimed in claim 1, characterised in that the heater (10) is arranged to substantially completely overlie the turntable (8) .
3. An oven as claimed in claim 1 or 2, characterised in that the heater (10) is of substantially circular form.
4. An oven as claimed in any preceding claim, characterised in that the at least one heating element (16) is adapted and arranged to have a power density at a substantially circular peripheral region (20) thereof which is greater than a power density at a central region (22) thereof.
5. An oven as claimed in claim 4, characterised in that the at least one heating element (16) is adapted and arranged whereby the power density at the substantially circular peripheral region (20) thereof is from 110 to 140 percent, preferably from 120 to 130 percent, of the power density at the central region (22) thereof.
6. An oven as claimed in any preceding claim, characterised in that the power density of the at least one heating element (16) at the substantially circular peripheral region (20) thereof is of the order of 5 watts per square centimetre and the power density of the heating element at the central region (22) thereof is of the order of 4 watts per square centimetre.
7. An oven as claimed in any one of claims 4 to 6, characterised in that the at least one heating element
(16) comprises spaced apart turns of elongate electrical conductor material having adjacent turns more closely spaced at the substantially circular peripheral region (20) thereof than at the central region (22) thereof.
8. An oven as claimed in claim 7, characterised in that the spaced apart turns of elongate electrical conductor material are arranged in single or multiple spiral form, for example of double spiral form.
9. An oven as claimed in claim 7 or 8, characterised in that the at least one heating element (16) is of wire or ribbon form.
10. An oven as claimed in claim 9, characterised in that the at least one heating element (16) is supported on a base layer (14) of electrical insulation material, such as of microporous thermal and electrical insulation material .
11. An oven as claimed in claim 10, characterised in that the base layer (14) of insulation material is provided in a dish-like support (12) , for example of metal .
12. An oven as claimed in claim 11, characterised in that the dish-like support (12) is of substantially circular form. lS. An oven as claimed in any preceding claim, characterised in that a single heating element (16) is provided.
PCT/GB2001/004908 2000-11-10 2001-11-06 Oven with cavity having turntable and heater WO2002039020A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0309363A GB2384553B (en) 2000-11-10 2001-11-06 Oven with cavity having turntable and heater
AU2002223785A AU2002223785A1 (en) 2000-11-10 2001-11-06 Oven with cavity having turntable and heater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0027467A GB0027467D0 (en) 2000-11-10 2000-11-10 Radiant electric heater
GB0027467.0 2000-11-10

Publications (2)

Publication Number Publication Date
WO2002039020A2 true WO2002039020A2 (en) 2002-05-16
WO2002039020A3 WO2002039020A3 (en) 2002-08-08

Family

ID=9902921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/004908 WO2002039020A2 (en) 2000-11-10 2001-11-06 Oven with cavity having turntable and heater

Country Status (3)

Country Link
AU (1) AU2002223785A1 (en)
GB (2) GB0027467D0 (en)
WO (1) WO2002039020A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10355491A1 (en) * 2003-11-27 2005-07-07 Electrolux Home Products Corporation N.V. A cooker has heating elements, which are optimized regarding their distances to achieve an even temperature distribution
CN113397371A (en) * 2021-06-30 2021-09-17 广东美的厨房电器制造有限公司 Cooking utensil

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2159285A1 (en) * 1971-11-30 1973-06-07 Miele & Cie OVEN HEATING WITH A GRILL RADIATOR AND WITH A TOP HEATING RADIATOR
FR2380682A1 (en) * 1977-02-11 1978-09-08 Pintard Charlie Flat heating surface for domestic ovens - has two independent elements and is used for pizza preparation with high temp. at edge of plate
US4326113A (en) * 1976-09-06 1982-04-20 Sharp Kabushiki Kaisha Heater disposed below a turntable in a combination microwave and electric oven
US4453064A (en) * 1976-09-13 1984-06-05 Sharp Kabushiki Kaisha Enameled metal turntable in a combination microwave and electric oven
GB2202623A (en) * 1987-02-18 1988-09-28 Belling & Co Ltd Combined grill and oven
EP1083773A2 (en) * 1999-09-10 2001-03-14 Ceramaspeed Limited Radiant electric heater for a microwave oven

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2159285A1 (en) * 1971-11-30 1973-06-07 Miele & Cie OVEN HEATING WITH A GRILL RADIATOR AND WITH A TOP HEATING RADIATOR
US4326113A (en) * 1976-09-06 1982-04-20 Sharp Kabushiki Kaisha Heater disposed below a turntable in a combination microwave and electric oven
US4453064A (en) * 1976-09-13 1984-06-05 Sharp Kabushiki Kaisha Enameled metal turntable in a combination microwave and electric oven
FR2380682A1 (en) * 1977-02-11 1978-09-08 Pintard Charlie Flat heating surface for domestic ovens - has two independent elements and is used for pizza preparation with high temp. at edge of plate
GB2202623A (en) * 1987-02-18 1988-09-28 Belling & Co Ltd Combined grill and oven
EP1083773A2 (en) * 1999-09-10 2001-03-14 Ceramaspeed Limited Radiant electric heater for a microwave oven

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10355491A1 (en) * 2003-11-27 2005-07-07 Electrolux Home Products Corporation N.V. A cooker has heating elements, which are optimized regarding their distances to achieve an even temperature distribution
DE10355491B4 (en) * 2003-11-27 2009-10-15 Electrolux Home Products Corporation N.V. heater
CN113397371A (en) * 2021-06-30 2021-09-17 广东美的厨房电器制造有限公司 Cooking utensil

Also Published As

Publication number Publication date
GB2384553B (en) 2004-06-23
GB0027467D0 (en) 2000-12-27
GB0309363D0 (en) 2003-06-04
WO2002039020A3 (en) 2002-08-08
GB2384553A (en) 2003-07-30
AU2002223785A1 (en) 2002-05-21

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