EP2848866B1 - Four de cuisson et procédé pour le faire fonctionner - Google Patents

Four de cuisson et procédé pour le faire fonctionner Download PDF

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Publication number
EP2848866B1
EP2848866B1 EP13184801.2A EP13184801A EP2848866B1 EP 2848866 B1 EP2848866 B1 EP 2848866B1 EP 13184801 A EP13184801 A EP 13184801A EP 2848866 B1 EP2848866 B1 EP 2848866B1
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EP
European Patent Office
Prior art keywords
heating element
heating
baking
oven
voltage
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.)
Active
Application number
EP13184801.2A
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German (de)
English (en)
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EP2848866A1 (fr
Inventor
Pal Kind
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.)
Electrolux Appliances AB
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Electrolux Appliances AB
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Priority to EP13184801.2A priority Critical patent/EP2848866B1/fr
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    • 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
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F24C7/088—Arrangement or mounting of control or safety devices of electric circuits regulating heat on stoves
    • 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 generally to the field of baking and/or cooking ovens. More specifically, the present invention is related to a baking and/or cooking oven with reduced energy consumption.
  • Baking and/or cooking ovens for preparing food are well known in prior art. Recent trends in developing baking and/or cooking ovens tend to reduce the energy consumption. There are different starting points for reducing the energy consumption of a baking and/or cooking oven, e.g. enhancing the thermal insulation of the oven cavity, using the residual heat of the heating elements etc..
  • Document AT 377 074 B discloses all features of the preamble of claims 1 and 5 and discloses a baking and grill device.
  • the cavity of the baking and grill device comprises three heating elements, wherein - depending on the status of the switches- two heating elements are connected in parallel and a further heating element is connected in series with said parallel connection.
  • European Patent Application EP 0 084 006 A1 discloses an electric oven.
  • the oven comprises multiple heating elements which are connected in parallel.
  • Document US 4,065,659 A discloses a food processing oven.
  • the oven comprises multiple heating elements which can be powered according to different modes.
  • a diode or resistor is included in the circuitry in order to reduce the output power of the heating elements.
  • a drawback of baking and/or cooking ovens with reduced energy consumption is that those baking and/or cooking ovens are quite expensive because of technical effort.
  • the invention relates to a baking and/or cooking oven comprising at least a first, a second and a third heating element for heating a cavity of the oven, wherein the third heating element is connected in series with the first and the second heating element.
  • the main advantage of the serial connection of the third heating element with the first and the second heating element is, that the heating elements are operated at a power lower than the nominal power of said heating elements because the input voltage of the oven is divided, wherein a first portion of the input voltage drops at the first and the second heating element and a second portion of the input voltage drops at the third heating element.
  • the first and the second heating elements are connected in parallel. Thereby, the voltage drop across the first and second heating element is nearly equal and the first portion of the input voltage drops at the parallel connection and the remaining portion of the input voltage applies at the third heating element. According to the invention, the portions of the input voltage applying at the respective heating elements are lower than the nominal voltage of said heating elements.
  • the first heating element is an upper heating element, i.e. the upper heating element is situated at the top of the oven cavity.
  • the second heating element is a lower heating element, i.e. the lower heating element is situated at the bottom of the oven cavity.
  • the third heating element is a grill heating element.
  • said grill heating element is also located at the top of the oven cavity.
  • the entire circuit comprising the parallel connection of the first and the second heating element in series with the third heating element is adapted to be supplied with a voltage of 230V AC.
  • the nominal voltage of the first, second and third heating element may also be 230V AC. Due to the splitting of the input voltage at the series connection of the third heating element and the first and second heating elements, said heating elements are applied with a voltage below 230V AC and thereby operated below their nominal power.
  • the first heating element and/or the second heating element is located within the oven cavity. Thereby a direct heating of the oven cavity may be obtained which also enhances the power efficiency.
  • the first heating element is located next to the third heating element.
  • the first and the third heating element are located at the top of the oven cavity thereby providing an upper heat to the food to be baked.
  • the oven is adapted to operate the first and second heating elements below their nominal electrical power.
  • the energy loss due to heat radiation is reduced because the preheating of the baking and/or cooking oven takes a longer time in comparison to driving the first and the second heating elements at nominal power.
  • the mean temperature during preheating is lowered resulting in a reduced energy loss, because that energy loss is directly proportional with the oven temperature.
  • the first and second heating elements are operated in series to the third heating element. However, it is preferred to operate the backing oven during preheating as well as during the cooking period in said series connection.
  • the oven is adapted to operate the third heating element below its nominal electrical power.
  • the energy loss due to heat radiation is reduced because the preheating of the baking and/or cooking oven takes a longer time in comparison to driving the third heating element at nominal power.
  • the mean temperature during preheating is lowered resulting in a reduced energy loss, because that energy loss is directly proportional with the oven temperature.
  • the invention relates to a method for operating a baking and/or cooking oven comprising at least a first, a second and a third heating element for heating a cavity of the baking and/or cooking oven, wherein the third heating element is operated in series to the first and the second heating element.
  • the main advantage of operating the third heating element in series with the first and the second heating element is, that the heating elements are operated at a power lower than the nominal power of said heating elements because the input voltage of the oven is divided, wherein a first portion of the input voltage drops at the first and the second heating element and a second portion of the input voltage drops at the third heating element.
  • the first and the second heating element are operated in parallel.
  • the entire circuit comprising the parallel connection of the first and the second heating element in series with the third heating element is supplied with a voltage of 230V AC.
  • all heating elements comprise a nominal voltage of 230V AC. Due to the splitting of the input voltage, the heating elements are operated below their nominal voltage.
  • the first and second heating elements are operated below their nominal electrical power. Due to the splitting of the input voltage, the first and second heating elements are operated below their nominal voltage and therefore below their nominal power which leads to an enhanced energy efficiency.
  • the third heating element is operated below its nominal electrical power. Due to the splitting of the input voltage, the third heating element is operated below its nominal voltage and therefore below its nominal power which leads to an enhanced energy efficiency.
  • Fig. 1 illustrates a baking and/or cooking oven 1 by means of a schematic diagram.
  • the baking and/or cooking oven 1 comprises on oven cavity 2 which is adapted to receive the food to be cooked and/or baked.
  • the baking and/or cooking oven 1 comprises a first, a second and a third heating element 3, 4, 5 for heating the oven cavity 2.
  • the first, second and third heating element 3, 4, 5 may be heating elements separated from each other, i.e. the heating elements may be situated at different locations within the oven cavity 2.
  • the first heating element 3 is the upper heating element located at the top of the oven cavity 2
  • the second heating element 4 is the lower heating element located at the bottom of the oven cavity 2
  • the third heating element 5 is a grill heating element which is preferably located also at the top of the oven cavity 2.
  • the heating elements 3, 4, 5 are electrically connected to an electrical input 6 for connecting the baking and/or cooking oven 1 via a thermostat 7 and a thermal cut out 8 with an electrical power source, e.g. the domestic mains supply.
  • the baking and/or cooking oven 1 may also comprise an oven selector switch 9 for switching the baking and/or cooking oven 1 on/off and/or for operating the baking and/or cooking oven 1 at different programs.
  • the baking and/or cooking oven 1 may be adapted to be operated with an electric voltage of 230V AC.
  • the third heating element 5 is connected in series to the first heating element 3 and the second heating element 4. Thereby the input voltage of 230V AC drops along the series connection of the first heating element 3 and the third heating element 5, respectively, the second heating element 4 and the third heating element 5.
  • the first, the second and the third heating element 3, 4, 5 may be adapted to be driven each at a nominal voltage of 230V AC in order to achieve their nominal power. Due to the series connection of the first heating element 3 and the third heating element 5, respectively, the second heating element 4 and the third heating element 5, each heating element is operated with a voltage below the nominal voltage, i.e. a voltage lower than 230V AC. Since the voltage dropped over the heating elements 3, 4, 5 is lower than the voltage necessary to achieve the nominal power of the heating elements, the heating elements 3, 4, 5 are driven below their nominal power.
  • the voltage drop at the heating element 5 is between 100V and 120V, preferably ⁇ 110V.
  • the voltage drop over the first and second heating element 3, 4 is between 110V and 130V.
  • the first and the second heating element 3, 4 are interconnected in parallel and the third heating element 5 is interconnected in series with said parallel connection.
  • first electrical connectors of the first and second heating elements are coupled and second electrical connectors of the first and second heating element are coupled, wherein a first electrical connector of the third heating element is coupled with said second electrical connectors of the first and second heating element.
  • the first and the second heating element 3, 4 are driven with the same voltage, namely the residual voltage V
  • V in - V HE5 , wherein V in is the input voltage and V HE5 is the voltage drop at the third heating element 5.
  • the first heating element 3 may have a nominal power consumption of 800 W driven by a voltage of 230V AC
  • the second heating element 3 may have a nominal power consumption of 1000 W driven by a voltage of 230V AC
  • the third heating element 5 may have a nominal power consumption of 1650 W driven by a voltage of 230V AC. Due to connecting the third heating element 5 in series with the first and the second heating element 3, 4, the power consumption of the oven may be reduced significantly. Said reduced energy consumption leads on the one hand to an increased period of time for preheating the oven cavity 2 and an increased cooking time, but, on the other hand, to a reduced loss of heat (heating the environment of the baking and/or cooking oven 1).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of Resistance Heating (AREA)

Claims (6)

  1. Four de rôtissage et/ou de cuisson comportant au moins un premier, un deuxième et un troisième élément chauffant (3, 4, 5) servant à chauffer une cavité (2) du four, le troisième élément chauffant (5) étant branché en série avec le premier et le deuxième élément chauffant (3, 4) et le premier et le deuxième élément chauffant (3, 4) étant branchés en parallèle,
    le four (1) étant prévu pour faire fonctionner les premier, deuxième et troisième éléments chauffants (3, 4, 5) en-dessous de leur puissance électrique nominale, le premier élément chauffant (3) étant un élément chauffant supérieur, le deuxième élément chauffant (4) étant un élément chauffant inférieur et le troisième élément chauffant (5) étant un élément chauffant de grill et caractérisé en ce que la chute de tension au niveau du troisième élément chauffant (5) est comprise entre 100 V et 120 V, la chute de tension sur le premier et le deuxième élément chauffant (3, 4) est comprise entre 110 V et 130 V de telle façon qu'aucun des éléments chauffants (3, 4, 5) n'atteigne l'état d'incandescence pendant le chauffage de la cavité (2) du four.
  2. Four de rôtissage et/ou de cuisson selon la revendication 1, l'ensemble du circuit qui comporte le branchement en parallèle du premier et du deuxième élément chauffant (3, 4) en série avec le troisième élément chauffant (5) étant prévu pour être alimenté avec une tension de 230 V alternatifs.
  3. Four de rôtissage et/ou de cuisson selon l'une des revendications précédentes, le premier élément chauffant (3) et/ou le deuxième élément chauffant étant situés à l'intérieur de la cavité (2) du four.
  4. Four de rôtissage et/ou de cuisson selon l'une des revendications précédentes, le premier élément chauffant (3) étant situé au sommet de la cavité (2) du four près du troisième élément chauffant (5).
  5. Procédé pour faire fonctionner un four de rôtissage et/ou de cuisson selon l'une des revendications 1 à 4, le troisième élément chauffant (5) étant mis en fonctionnement en série par rapport au premier et au deuxième élément chauffant (3, 4) et le premier et le deuxième élément chauffant (3, 4) étant mis en fonctionnement en parallèle, les premier, deuxième et troisième éléments chauffants (3, 4, 5) étant mis en fonctionnement en-dessous de leur puissance électrique nominale et la chute de tension au niveau du troisième élément chauffant (5) étant comprise entre 100 V et 120 V, la chute de tension sur le premier et le deuxième élément chauffant (3, 4) étant comprise entre 110 V et 130 V de telle façon qu'aucun des éléments chauffants n'atteigne l'état d'incandescence pendant le chauffage de la cavité (2) du four.
  6. Procédé selon la revendication 6, l'ensemble du circuit qui comporte le branchement en parallèle du premier et du deuxième élément chauffant (3, 4) en série avec le troisième élément chauffant (5) étant alimenté avec une tension de 230 V.
EP13184801.2A 2013-09-17 2013-09-17 Four de cuisson et procédé pour le faire fonctionner Active EP2848866B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13184801.2A EP2848866B1 (fr) 2013-09-17 2013-09-17 Four de cuisson et procédé pour le faire fonctionner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13184801.2A EP2848866B1 (fr) 2013-09-17 2013-09-17 Four de cuisson et procédé pour le faire fonctionner

Publications (2)

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EP2848866A1 EP2848866A1 (fr) 2015-03-18
EP2848866B1 true EP2848866B1 (fr) 2020-02-05

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3364109B1 (fr) * 2017-02-17 2019-12-18 Electrolux Appliances Aktiebolag Four de cuisson

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4065659A (en) * 1976-01-09 1977-12-27 Mcgraw-Edison Company Food processing oven
US6812433B1 (en) * 2003-12-08 2004-11-02 Maytag Corporation No preheat system for a cooking appliance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT377074B (de) * 1979-08-16 1985-02-11 Burg Konrad Fa Back- und grillgeraet
FR2519413B1 (fr) * 1982-01-06 1987-05-22 Dietrich & Cie De Four electrique de cuisson domestique
GB2354687B (en) * 1999-09-10 2004-06-02 Ceramaspeed Ltd Microwave oven incorporating a radiant electric heater
JP5169494B2 (ja) * 2008-05-30 2013-03-27 タイガー魔法瓶株式会社 オーブントースター

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4065659A (en) * 1976-01-09 1977-12-27 Mcgraw-Edison Company Food processing oven
US6812433B1 (en) * 2003-12-08 2004-11-02 Maytag Corporation No preheat system for a cooking appliance

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