EP1457740B1 - Procedure pour l'opération d'un four cuisinère et four avec un ventilateur de refroidissement - Google Patents

Procedure pour l'opération d'un four cuisinère et four avec un ventilateur de refroidissement Download PDF

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Publication number
EP1457740B1
EP1457740B1 EP20030100631 EP03100631A EP1457740B1 EP 1457740 B1 EP1457740 B1 EP 1457740B1 EP 20030100631 EP20030100631 EP 20030100631 EP 03100631 A EP03100631 A EP 03100631A EP 1457740 B1 EP1457740 B1 EP 1457740B1
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EP
European Patent Office
Prior art keywords
oven
cooling fan
cooking
steam
chimney
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.)
Expired - Fee Related
Application number
EP20030100631
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German (de)
English (en)
Other versions
EP1457740A1 (fr
Inventor
Luca Whirlpool Europe s.r.l. Frasnetti
Fabrizio Whirlpool Europe s.r.l. Lattuada
Fabio Baranzelli
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.)
Whirlpool Corp
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Whirlpool Corp
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Publication date
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Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to EP20030100631 priority Critical patent/EP1457740B1/fr
Priority to ES03100631T priority patent/ES2318088T3/es
Priority to DE60325324T priority patent/DE60325324D1/de
Publication of EP1457740A1 publication Critical patent/EP1457740A1/fr
Application granted granted Critical
Publication of EP1457740B1 publication Critical patent/EP1457740B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • 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
    • F24C15/00—Details
    • F24C15/006—Arrangements for circulation of cooling air

Definitions

  • the present invention relates to a method for operating a domestic oven for cooking of food, such oven having a cooling fan and a chimney for discharge of vapours from a cooking chamber, such discharge being substantially driven by said cooling fan.
  • the cooling fan is used for cooling a zone outside the cooking chamber where electronic components of the oven are placed, and/or for producing a flow of cooling air exiting in the front part of the oven, in order to cool the door of the oven and/or its handle and/or the control panel of the oven. It is also well known that the flow of vapours and/or gaseous residues across the chimney is driven by the flow of cooling air by means of Venturi effect.
  • the technical field of cooking ovens is now facing the new environmental challenge of increasing the energy efficiency of the appliances, also in view of the related energy efficiency labelling.
  • the main purpose of the European regulation underlying the energy efficiency labelling is to provide the consumers with efficient ovens in order to use the available energy in a better way, therefore saving customer's money.
  • the present technology trend is to have an oven that cooks properly, with low temperature on touchable parts (knobs, handle, etc.) and with no side effect such as steam condensation on door and control panel; that means cooling the oven in an effective way.
  • the above mentioned last problems, i.e. steam condensation leads to the above mentioned steam exhaust chimney, an air duct that allows the steam generated in the cavity to leave it without having condensation on cold parts of the oven. While steam goes out, part of the heat goes out too, decreasing in that way the overall efficiency of the oven.
  • Cooling effectiveness and oven efficiency represent two opposite needs and one of the objects of the present invention is to provide a method and a domestic oven that allow to satisfy both needs.
  • the chimney In ovens with steam exhaust chimney, the chimney itself is one of the major sources of heat loss: the chimney in fact is getting the steam out the cavity, bringing out a big part of heat also. In a medium size oven, that heat loss can be quantified in 10%-20% during a "code Energy Efficiency test" carried out with brick as load in the oven chamber.
  • the steam flow in the chimney is activated by the Venturi effect applied at one end of the chimney, using a restriction in the air channel utilised for cooling.
  • the air used to cool the oven passes through the Venturi that activates a sucking effect in the cooking chamber that extracts the steam (and the heat) from the chamber itself.
  • the steam is then mixed with the cooling air flow, diluted by it and dispersed in the ambient far from the oven, avoiding in that way condensation on cold oven parts.
  • DE 3209541 A concerns a domestic oven provided with a cooling fan, which is driven by an electric motor.
  • the motor is supplied in continuous mode, being connected to the power supply network, i.e. 230V 50Hz alternate current.
  • the motor is provided with two switches connected in parallel, controlling its activation.
  • the first switch operates according to a signal detected by the humidity sensor located into the oven chimney.
  • the second switch is driven by a temperature sensor positioned into the area in which the oven control elements are positioned.
  • DE 10128370 A discloses an electronic oven in which some characteristic data related to the cooling fan motor operation, for each cooking/heating mode, are stored into a solid state memory.
  • the speed profiles, variables or constants, for the cooling fan motor in each of the cooking/heating modes, is one example of the characteristic data that can be stored into the memory.
  • the document is mainly focused on the memorization feature, without mentioning any requirement for the motor driving methods, neither explaining what characteristics the speed profile need to comply in order to save energy. This is not understood from the document, especially in the case when the cooling fan motor is an usual asynchronous motor.
  • EP-A-0633433 teaches about a built-in cooking stove, located beneath the work plate, having a steam outlet aperture connected to an outlet air opening.
  • a suction fan actionable by a control device connected to a sensor for the humidity and/or temperature, is positioned in the outlet air opening.
  • US-A-4886046 discloses a cooling apparatus for an eye level range.
  • the blower control circuit is provided with a thermostat switch coupled to the blower motor, to automatically initiate operation when a pre-selected high temperature is sensed.
  • the present invention teaches how to optimise steam extraction without loosing too much energy efficiency.
  • Another goal of the invention is to provide a cheap implementation design that allows using the above teaching on all production ovens without cost limitation.
  • Another object of the invention is to provide a type of ventilation, depending on the cooking function, which enables to optimise the cooling capacity without losing energy efficiency and preserving low temperature on components and aesthetic parts. Such aim is reached according to a method for operating a domestic oven and to an oven performing such method according to the annexed claims.
  • the applicant has discovered that by operating the cooling fan in an on/off mode, with a control period of 30-90 second and a duty cycle from 10% to 60%, there is a surprising sensible increase of energy efficiency without the drawbacks of vapour condensation on cold part of the oven.
  • the above values of control period and duty cycle are related to a medium size oven and can change with oven configuration and size.
  • the on/off operation is selected instead of a continuos speed reduction of the fan motor because it gives additional advantages.
  • the cooling fan is off, there is a steady air situation in the cooking chamber or cavity and the steam can operate as a heat transfer mean to the food (or to the brick in an energy efficiency test configuration).
  • the reduced speed operation mode (which can be obtained by means of a variable speed motor of the cooling fan) is not appropriate because it keeps always a flow of steam, even when the fan speed is set to very low values.
  • a final consideration is that to get the minimum steam exhaust effect required, the fan should turn at a very low speed, speed that is not obtainable with a low cost fan motor used in usual tangential fans for ovens. In fact to get 10% of the nominal rotational speed, a DC motor or an inverter would be needed, with a cost that is from four to twenty time higher than an usual motor used for tangential fans.
  • the appliance shown in figure 1 comprises an outer casing 1 with an electrical cooking hob 2, for example of glass ceramic type, and an underlying electric oven 3.
  • an electrical cooking hob 2 for example of glass ceramic type
  • an underlying electric oven 3 Within the casing 1 between the oven and cooking hob there is a compartment 9 in which a tangential or radial fan 8 is positioned together with the electronic controls 10 and 11 and power components 30 of the appliance.
  • the fan 8 creates within the compartment 9 an air flow along the paths indicated by the arrows, to limit the temperature within the compartment 9.
  • a chimney 17 gets the steam out the cavity, bringing out a part of heat.
  • the steam flow in the chimney 17 is activated by the Venturi effect applied at the end of the chimney, using a restriction (not shown) in the air channel utilised for cooling.
  • the air used to cool the oven passes through the Venturi that activates a sucking effect in the cavity that extract the steam (and the heat) from the cavity itself.
  • the steam is then mixed with the cooling air flow of the cooling, diluted by it and dispersed in the ambient far from the oven, avoiding in that way condensation on oven parts.
  • the cooking hob comprises four conventional heating elements 6a, 6b, 6c, and 6d, each being activated by the hob power module 10.
  • the cooking hob power module 10 and the cooking hob user interface 11 are connected together via a serial communication 20 allowing information relative to the system to be mutually exchanged.
  • the cooking hob user interface 11 and oven power control 30 are connected together via a serial communication allowing the exchange of information relative to the working of the appliance.
  • the cooking hob comprises four conventional heating elements 6a, 6b, 6c and 6d, each one activated by a series of setting knobs 5a, 5b, 5c, 5d, 5e and 5f, each one connected in series with a safety switch 25, for instance a so called "klixon", which opens the power circuit on reaching a temperature dangerous for the conventional hob plate provided with the cooking hob.
  • the oven user interface 4 consists of 2 knobs 5a, 5b and a push button 5p .
  • the knob 5a is used to set the required oven temperature and/or cooking time
  • the knob 5b serves to set the oven function
  • the button 5p is used to confirm the settings.
  • the actual temperature is measured by a sensor 7 positioned within the oven.
  • the oven control 30 analyses and drives the on-off cycles of the heating elements 7a (this analysis being based on the temperature value acquired by a probe 7 that is positioned in the oven cavity) and the on/off cycle of the cooling fan 8.
  • the on/off cycle of the cooling fan 8 can be specific of the function selected by the user.
  • a probe 7c measures the ambient temperature of the compartment 9. If temperature of the probe 7c or 7 is too high for electronics components, cooling fan 8 is activated continuously, i.e. with a 100% duty cycle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)

Claims (6)

  1. Procédé pour actionner un four domestique (3) pour faire cuire des aliments, un tel four ayant un ventilateur de refroidissement (8), une cheminée (17) pour l'évacuation des vapeurs provenant d'une chambre de cuisson, une telle évacuation étant sensiblement entraînée par ledit ventilateur de refroidissement (8), caractérisé en ce que le ventilateur de refroidissement (8) est mis en marche/arrêté selon un cycle avec une période de commande comprise entre 30 et 90 secondes et un coefficient d'utilisation compris entre 10 % et 60 % afin d'améliorer l'efficacité énergétique du four (3).
  2. Procédé selon la revendication 1, caractérisé en ce que la séquence de marche/arrêt est optimisée selon le programme de cuisson sélectionné par l'utilisateur.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le ventilateur de refroidissement (8) est mis en marche, indépendamment de la séquence de marche/arrêt prédéterminée, si la température d'une zone extérieure (9) du four (3) est supérieure à une valeur prédéterminée.
  4. Four de cuisson domestique (3) comprenant un ventilateur de refroidissement (8), une cheminée (17) pour l'évacuation des vapeurs provenant d'une chambre de cuisson, une telle évacuation étant sensiblement entraînée par le ventilateur de refroidissement (8), caractérisé en ce qu'il comprend une unité de commande électronique (10, 11) adaptée pour mettre en marche/arrêter le ventilateur (8) selon un cycle avec une période de commande comprise entre 30 secondes et 90 secondes et un coefficient d'utilisation compris entre 10 % et 60 % afin d'améliorer l'efficacité énergétique du four (3).
  5. Four (3) selon la revendication 4 , caractérisé en ce que l'unité de commande électronique (10, 11) est adaptée pour recevoir l'information concernant le véritable programme de cuisson sélectionné par l'utilisateur et pour optimiser la séquence de marche/arrêt du ventilateur de refroidissement (8) de manière appropriée.
  6. Four (3) selon l'une quelconque des revendications 4 ou 5, caractérisé en ce qu'il comprend un capteur de température (7c) dans au moins une zone (9) à l'extérieur de la chambre de cuisson et relié à l'unité de commande électronique (10, 11), une telle unité étant adaptée pour mettre en marche le ventilateur de refroidissement (8), indépendamment de la séquence de marche/arrêt prédéterminée, si la température d'une telle zone (9) à l'extérieur de la chambre de cuisson est supérieure à une valeur prédéterminée.
EP20030100631 2003-03-12 2003-03-12 Procedure pour l'opération d'un four cuisinère et four avec un ventilateur de refroidissement Expired - Fee Related EP1457740B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20030100631 EP1457740B1 (fr) 2003-03-12 2003-03-12 Procedure pour l'opération d'un four cuisinère et four avec un ventilateur de refroidissement
ES03100631T ES2318088T3 (es) 2003-03-12 2003-03-12 Metodo de funcionamiento de un horno domestico y horno de cocina con un ventilador de enfriamiento.
DE60325324T DE60325324D1 (de) 2003-03-12 2003-03-12 Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030100631 EP1457740B1 (fr) 2003-03-12 2003-03-12 Procedure pour l'opération d'un four cuisinère et four avec un ventilateur de refroidissement

Publications (2)

Publication Number Publication Date
EP1457740A1 EP1457740A1 (fr) 2004-09-15
EP1457740B1 true EP1457740B1 (fr) 2008-12-17

Family

ID=32748959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030100631 Expired - Fee Related EP1457740B1 (fr) 2003-03-12 2003-03-12 Procedure pour l'opération d'un four cuisinère et four avec un ventilateur de refroidissement

Country Status (3)

Country Link
EP (1) EP1457740B1 (fr)
DE (1) DE60325324D1 (fr)
ES (1) ES2318088T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11965655B2 (en) 2020-02-20 2024-04-23 Lg Electronics Inc. Cooking appliance and control method thereof

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4382849B2 (ja) 2004-04-15 2009-12-16 デントフィット・アクティーゼルスカブ 歯科用充填材料の超音波硬化
ATE488735T1 (de) * 2006-12-18 2010-12-15 Arcelik As Haushaltsgerät
US8342165B2 (en) 2008-12-04 2013-01-01 General Electric Company Appliance with a Venturi based venting system
TR201104273A1 (tr) 2011-05-02 2012-11-21 Ar�El�K Anon�M ��Rket� Enerji tüketimi azaltılan fırın.
WO2014016033A1 (fr) 2012-07-27 2014-01-30 Arcelik Anonim Sirketi Dispositif de cuisson comprenant un ventilateur de refroidissement
EP2913590A1 (fr) * 2014-02-28 2015-09-02 Miele & Cie. KG Appareil de cuisson et procédé de fonctionnement
ES2858475T3 (es) * 2014-11-07 2021-09-30 Candy Spa Horno de cocción
KR101654725B1 (ko) 2015-01-16 2016-09-06 엘지전자 주식회사 조리기기
BR102016014187B1 (pt) * 2016-06-17 2022-11-16 Whirlpool S.A Sistema de resfriamento para forno

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911893A (en) * 1974-06-24 1975-10-14 White Westinghouse Corp Ventilating system for self-cleaning wall oven
DE3209541A1 (de) * 1982-03-16 1983-09-29 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Backofen
US4886046A (en) * 1987-10-26 1989-12-12 Whirlpool Corporation Motor control circuit for an eye level range
DE4322360A1 (de) * 1993-07-05 1995-01-12 Bosch Siemens Hausgeraete Einbauherd
IT1292485B1 (it) * 1997-07-04 1999-02-08 Whirlpool Co Sistema di ventilazione per apparecchi elettrici di cottura di alimenti comprendenti un piano di cottura e un forno
DE29821158U1 (de) * 1998-11-26 2000-03-30 Aeg Hausgeraete Gmbh Garofen mit Kühlung und Wrasenabführung
DE50108057D1 (de) * 2000-05-17 2005-12-22 V Zug Ag Zug Backofen-Entlüftung
DE10128370B4 (de) * 2001-06-12 2011-12-15 BSH Bosch und Siemens Hausgeräte GmbH Gargerät mit einem Kühllüfter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11965655B2 (en) 2020-02-20 2024-04-23 Lg Electronics Inc. Cooking appliance and control method thereof

Also Published As

Publication number Publication date
DE60325324D1 (de) 2009-01-29
ES2318088T3 (es) 2009-05-01
EP1457740A1 (fr) 2004-09-15

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