EP1457740A1 - Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse - Google Patents

Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse Download PDF

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Publication number
EP1457740A1
EP1457740A1 EP03100631A EP03100631A EP1457740A1 EP 1457740 A1 EP1457740 A1 EP 1457740A1 EP 03100631 A EP03100631 A EP 03100631A EP 03100631 A EP03100631 A EP 03100631A EP 1457740 A1 EP1457740 A1 EP 1457740A1
Authority
EP
European Patent Office
Prior art keywords
oven
cooling fan
cooking
sequence
discharge
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.)
Granted
Application number
EP03100631A
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English (en)
French (fr)
Other versions
EP1457740B1 (de
Inventor
Luca Whirlpool Europe s.r.l. Frasnetti
Fabrizio Whirlpool Europe s.r.l. Lattuada
Fabio Baranzelli
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Whirlpool Corp
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Whirlpool Corp
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.)
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Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=32748959&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1457740(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to DE60325324T priority Critical patent/DE60325324D1/de
Priority to EP20030100631 priority patent/EP1457740B1/de
Priority to ES03100631T priority patent/ES2318088T3/es
Publication of EP1457740A1 publication Critical patent/EP1457740A1/de
Application granted granted Critical
Publication of EP1457740B1 publication Critical patent/EP1457740B1/de
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.
  • 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, preferably 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-preferred 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
EP20030100631 2003-03-12 2003-03-12 Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse Expired - Fee Related EP1457740B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60325324T DE60325324D1 (de) 2003-03-12 2003-03-12 Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse
EP20030100631 EP1457740B1 (de) 2003-03-12 2003-03-12 Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse
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.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030100631 EP1457740B1 (de) 2003-03-12 2003-03-12 Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse

Publications (2)

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

Family

ID=32748959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030100631 Expired - Fee Related EP1457740B1 (de) 2003-03-12 2003-03-12 Verfahren zum Betrieb eines Haushaltsbackofens und Backofen mit einem Kühlgebläse

Country Status (3)

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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008074714A1 (en) * 2006-12-18 2008-06-26 Arcelik Anonim Sirketi A household appliance
WO2012150227A1 (en) 2011-05-02 2012-11-08 Arcelik Anonim Sirketi An oven the energy consumption of which is reduced
US8342165B2 (en) 2008-12-04 2013-01-01 General Electric Company Appliance with a Venturi based venting system
WO2014016033A1 (en) 2012-07-27 2014-01-30 Arcelik Anonim Sirketi A cooking device comprising a cooling fan
US9095508B2 (en) 2004-04-15 2015-08-04 Aproxi Aps Composite material, in particular a dental filling material, ultrasonic curing of dental filing materials, and a population of zirconia particles
EP2913590A1 (de) * 2014-02-28 2015-09-02 Miele & Cie. KG Gargerät und Verfahren zum Betreiben
EP3018419A1 (de) * 2014-11-07 2016-05-11 Candy S.p.A. Kochofen
AU2016200086A1 (en) * 2015-01-16 2016-08-04 Lg Electronics Inc. Cooking appliance
EP3472521A4 (de) * 2016-06-17 2020-01-15 Whirlpool S.A. Kühlsystem für einen ofen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210106290A (ko) 2020-02-20 2021-08-30 엘지전자 주식회사 조리기기 및 그 제어방법

Citations (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
EP0633433A1 (de) * 1993-07-05 1995-01-11 Bosch-Siemens HausgerÀ¤te GmbH Einbauherd
EP0889672A2 (de) * 1997-07-04 1999-01-07 Whirlpool Corporation Luftungssytem für Kochgeräte bestehend aus einem Kochfeld und einem Ofen
DE19949724A1 (de) * 1998-11-26 2000-06-08 Aeg Hausgeraete Gmbh Wrasenkanal für Garofen
EP1156282A1 (de) * 2000-05-17 2001-11-21 V-Zug AG Backofen-Entlüftung
DE10128370A1 (de) * 2001-06-12 2002-12-19 Bsh Bosch Siemens Hausgeraete Gargerät mit einem Kühllüfter

Patent Citations (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
EP0633433A1 (de) * 1993-07-05 1995-01-11 Bosch-Siemens HausgerÀ¤te GmbH Einbauherd
EP0889672A2 (de) * 1997-07-04 1999-01-07 Whirlpool Corporation Luftungssytem für Kochgeräte bestehend aus einem Kochfeld und einem Ofen
DE19949724A1 (de) * 1998-11-26 2000-06-08 Aeg Hausgeraete Gmbh Wrasenkanal für Garofen
EP1156282A1 (de) * 2000-05-17 2001-11-21 V-Zug AG Backofen-Entlüftung
DE10128370A1 (de) * 2001-06-12 2002-12-19 Bsh Bosch Siemens Hausgeraete Gargerät mit einem Kühllüfter

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9095508B2 (en) 2004-04-15 2015-08-04 Aproxi Aps Composite material, in particular a dental filling material, ultrasonic curing of dental filing materials, and a population of zirconia particles
WO2008074714A1 (en) * 2006-12-18 2008-06-26 Arcelik Anonim Sirketi A household appliance
US8342165B2 (en) 2008-12-04 2013-01-01 General Electric Company Appliance with a Venturi based venting system
WO2012150227A1 (en) 2011-05-02 2012-11-08 Arcelik Anonim Sirketi An oven the energy consumption of which is reduced
WO2014016033A1 (en) 2012-07-27 2014-01-30 Arcelik Anonim Sirketi A cooking device comprising a cooling fan
EP2913590A1 (de) * 2014-02-28 2015-09-02 Miele & Cie. KG Gargerät und Verfahren zum Betreiben
EP3018419A1 (de) * 2014-11-07 2016-05-11 Candy S.p.A. Kochofen
AU2016200086A1 (en) * 2015-01-16 2016-08-04 Lg Electronics Inc. Cooking appliance
AU2016200086B2 (en) * 2015-01-16 2017-03-09 Lg Electronics Inc. Cooking appliance
US10371392B2 (en) 2015-01-16 2019-08-06 Lg Electronics Inc. Cooking appliance
EP3472521A4 (de) * 2016-06-17 2020-01-15 Whirlpool S.A. Kühlsystem für einen ofen

Also Published As

Publication number Publication date
EP1457740B1 (de) 2008-12-17
ES2318088T3 (es) 2009-05-01
DE60325324D1 (de) 2009-01-29

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