EP0579074B1 - Four de cuisson à ventilateur de refroidissement et/ou à ventilateur à air chaud - Google Patents

Four de cuisson à ventilateur de refroidissement et/ou à ventilateur à air chaud Download PDF

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Publication number
EP0579074B1
EP0579074B1 EP93110684A EP93110684A EP0579074B1 EP 0579074 B1 EP0579074 B1 EP 0579074B1 EP 93110684 A EP93110684 A EP 93110684A EP 93110684 A EP93110684 A EP 93110684A EP 0579074 B1 EP0579074 B1 EP 0579074B1
Authority
EP
European Patent Office
Prior art keywords
baking oven
air fan
baking
oven according
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.)
Expired - Lifetime
Application number
EP93110684A
Other languages
German (de)
English (en)
Other versions
EP0579074A1 (fr
Inventor
Heinz Volker
Venjakob Rainer
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP0579074A1 publication Critical patent/EP0579074A1/fr
Application granted granted Critical
Publication of EP0579074B1 publication Critical patent/EP0579074B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • 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 invention relates to an oven with a heating element baking muffle and with a switch space provided outside the baking muffle for electrical or electronic components and with a cooling air blower arranged outside the baking muffle and / or with a hot air blower arranged inside the baking muffle.
  • DE-A-32 11 487 discloses a double oven in which the upper cooking space is heated with microwave energy, while the lower one is equipped with conventional radiators.
  • a large number of electrical and electronic components are housed outside the cooking compartments, protected against overheating, without providing a special cooling fan. This is achieved in particular by the fact that cooling air is sucked in via an air inlet opening on the upper housing edge by a fan, which thus cools the magnetron and the electronic components of the control device.
  • the fan motor driving this fan also puts another fan into operation for cooling the electrical components, such as a transformer.
  • another motor inside the lower cooking chamber drives a fan to circulate the heated air.
  • AC motors are used to drive these fans.
  • the disadvantage of these AC motors is that they have to be dimensioned for the frequency or amplitude of the mains voltage present. If devices are delivered to countries with different mains voltages, the appropriate motor must be installed in advance. This requires the provision and assembly of different engine types, which complicates the manufacture considerably.
  • the invention therefore presents the problem of creating an oven in which these disadvantages are avoided and universally usable cooling air and hot air blower motors can be used.
  • the fan motors are independent of the amplitude and frequency of the respective mains connection voltage can always be operated with the same supply voltage.
  • Another advantage is the considerably simplified speed control of these motors, as there is no need for expensive AC power controllers.
  • the fan motors are operated with a low voltage of less than 42 volts, in particular 12 or 24 volts. This eliminates the approval required for motors operated with higher supply voltages.
  • the same motor types can be used for all target countries during production, which has a particularly favorable effect on warehousing.
  • the oven in Figure 1 has a baking muffle (1), which is closed at the front by a door (2). There is an air inlet opening (3) in the area below the door (2) and an air outlet opening (4) in the handle area of the door (2). These are connected to a cooling air duct (5) arranged around the baking muffle (1).
  • a crossflow fan (6) inserted in this channel (5) serves as a cooling air blower. It is connected on the suction side to the air inlet opening (3) and on the pressure side to the air outlet opening (4) via the upper area of the cooling air duct (5), the latter separating the baking muffle (1) itself and the overlying switch space (7) of the oven.
  • the blown out cooling air serves on the one hand for thermal insulation the baking muffle (1), on the other hand, via a vapor extraction duct (8), it dissipates the cooking fumes generated in the baking muffle (1) to the outside.
  • the cross-flow fan (6) is driven by a fan motor (9) on the side.
  • switch room (7) In the switch room (7) are the electrical and electronic components for operating the oven and for the dependent control of the consumers.
  • a connection strip (10) via which the oven is supplied with mains voltage.
  • the entire control electronics (11) are located in the front area behind the control panel. This is electrically connected to selector switches (12) for selecting the baking muffle temperature and the type of heating, as well as the sensor for measuring the baking muffle temperature actually present.
  • a temperature sensor (13) is arranged inside or in the vicinity of the control electronics (11).
  • the baking muffle (1) is heated by an upper heat radiator (14), a lower heat radiator (15) and a ring radiator (16).
  • the blower wheel (17) of a hot-air blower is arranged inside the ring heating element and serves to evenly distribute the heat generated in the baking muffle (1).
  • the drive motor (18) of the hot air blower is fastened outside the baking muffle (1) on its rear side (19).
  • FIG. 2 shows the operation of the electrical and electronic components using a block diagram.
  • a primary-clocked switching power supply (20) generates two direct voltages of 12 volts and 24 volts, which are independent of the amplitude and frequency of the mains voltage.
  • the 12 volt voltage is used to supply small consumers and relays (not shown in the drawing) and, after transformation to 5 volts, to supply the control computer (21).
  • the 24-volt voltage is applied to the fan motor (9) and the drive motor (18) of the hot air blower via current valves (22a; 22b). Both motors (9; 18) are collectorless DC motors that work on the external rotor principle.
  • the control computer (21) opens and closes the current valves (22a; 22b) and thus influences the engine speeds.
  • the stator windings are commutated via Hall sensors. If the control computer (21) detects a rotor standstill, ie no change in the magnetic field, then it detects a failure of the cooling or hot air blower and switches off the radiators (14; 15; 16).
  • the speed of the cooling air fan is controlled continuously depending on the ambient temperature measured with the temperature sensor (13) on the control electronics (11) and depending on the type of heating set using the selector switch (12), but also depending on the type set in the baking muffle or existing temperature. In this way, on the one hand, the components of the control electronics (11) are protected against overheating, and, on the other hand, excessive cooling of the baking muffle can be prevented by the cooling fan being too powerful.
  • the stepless control of the hot air blower speed is only dependent on the type of heating set with the selector switch (12) in connection with the previously selected or actually existing temperatures in the baking muffle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Claims (10)

  1. Four de cuisson comprenant un moufle de cuisson (1) muni d'éléments chauffants (14, 15, 16), et un compartiment de commutation (7) prévu à l'extérieur du moufle de cuisson et renfermant des composants électriques ou électroniques, ainsi qu'une soufflante (6) à air de refroidissement, installée à l'extérieur du moufle de cuisson, et/ou une turbine (17) à air chaud, installée à l'intérieur du moufle de cuisson,
    caractérisé par le fait
    que l'entraînement de la turbine à air chaud et/ou de la soufflante à air de refroidissement (17 ; 6) a respectivement lieu par l'intermédiaire d'un moteur (9 ; 18) à basse tension qui est actionné, en permanence, avec une tension d'alimentation identique indépendamment de la fréquence et de l'amplitude de la tension de secteur considérée.
  2. Four de cuisson selon la revendication 1,
    caractérisé par le fait
    qu'une partie (20) d'un réseau combinatoire, à cadence d'horloge primaire, fournit une tension continue indépendante de la fréquence et de l'amplitude de la tension de secteur raccordée audit four de cuisson.
  3. Four de cuisson selon l'une des revendications 1 ou 2,
    caractérisé par le fait
    que la tension continue, alimentant les moteurs (9 ; 18) à basse tension, mesure de préférence 12 ou 24 volts, mais est toujours inférieure à 42 V.
  4. Four de cuisson selon l'une des revendications 1 à 3,
    caractérisé par le fait
    que les moteurs (9 ; 18) à basse tension sont des moteurs à courant continu dépourvus de collecteurs.
  5. Four de cuisson selon la revendication 4,
    caractérisé par le fait
    que les moteurs (9 ; 18) à courant continu, dépourvus de collecteurs, fonctionnent selon le principe de l'induit extérieur.
  6. Four de cuisson selon l'une des revendications 1 à 5,
    caractérisé par le fait
    que la commutation des enroulements statoriques a lieu à l'aide d'éléments de commande sensibles au champ magnétique, notamment par l'intermédiaire de capteurs de Hall.
  7. Four de cuisson selon l'une des revendications 1 à 6,
    caractérisé par le fait
    qu'un réglage de la vitesse angulaire s'opère en continu, dans la turbine (17) à air chaud, en fonction du mode de chauffage sélectionné dudit four de cuisson.
  8. Four de cuisson selon l'une des revendications 1 à 7,
    caractérisé par le fait
    qu'un réglage de la vitesse angulaire s'opère en continu, dans la turbine (17) à air chaud, en fonction de la température régnant effectivement ou sélectionnée au préalable dans le moufle de cuisson.
  9. Four de cuisson selon l'une des revendications 1 à 8,
    caractérisé par le fait
    que la soufflante (6) à air de refroidissement est commandable, un réglage continu de la vitesse angulaire s'opérant en fonction de la température régnant dans le compartiment de commutation, et du mode de chauffage réglé.
  10. Four de cuisson selon l'une des revendications 1 à 9,
    caractérisé par le fait
    que la soufflante (6) à air de refroidissement est commandable, un réglage continu de la vitesse angulaire s'opérant en fonction de la température régnant dans le moufle de cuisson.
EP93110684A 1992-07-06 1993-07-05 Four de cuisson à ventilateur de refroidissement et/ou à ventilateur à air chaud Expired - Lifetime EP0579074B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4222092 1992-07-06
DE4222092A DE4222092A1 (de) 1992-07-06 1992-07-06 Backofen mit einem Kühlluftgebläse und/oder mit einem Heißluftgebläse

Publications (2)

Publication Number Publication Date
EP0579074A1 EP0579074A1 (fr) 1994-01-19
EP0579074B1 true EP0579074B1 (fr) 1996-04-24

Family

ID=6462547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110684A Expired - Lifetime EP0579074B1 (fr) 1992-07-06 1993-07-05 Four de cuisson à ventilateur de refroidissement et/ou à ventilateur à air chaud

Country Status (2)

Country Link
EP (1) EP0579074B1 (fr)
DE (2) DE4222092A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20090611A1 (it) * 2009-08-04 2011-02-05 Indesit Co Spa Metodo per controllare il funzionamento di un forno

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6169378B1 (en) 1996-06-07 2001-01-02 Papst Motoren Gmbh & Co. Kg Electronically commutated motor with galvanically separate user interface circuit
DE10032762B4 (de) * 2000-07-05 2005-02-24 Rational Ag "Gargerät mit Spannungs-,Phasen-und /oder Frequenzumwandler"
DE10128370B4 (de) * 2001-06-12 2011-12-15 BSH Bosch und Siemens Hausgeräte GmbH Gargerät mit einem Kühllüfter
DE10128369B4 (de) 2001-06-12 2012-02-16 BSH Bosch und Siemens Hausgeräte GmbH Gargerät mit einem Wrasenlüfter
DE10230242B4 (de) * 2002-07-04 2004-08-19 Rational Ag Verfahren zum Betreiben einer Gebläseeinrichtung in einem Gargerät und Gargerät zum Durchführen dieses Verfahrens
US6772752B1 (en) * 2003-04-10 2004-08-10 Maytag Corporation Cooling system airflow sensor for a cooking appliance
DE10327342B4 (de) * 2003-06-16 2009-10-29 Heinrich Schürmann Verwendung eines Schaltnetzgerätes als Stromquelle für eine elektrische Wand- und/oder Fußbodenheizung
NL1024564C2 (nl) * 2003-10-17 2005-04-20 Konink Fabriek Inventum B V Oven, in het bijzonder voor toepassing in een vliegtuig, met een door een gelijkstroommotor aangedreven ventilator.
DE102006005293A1 (de) * 2006-02-06 2007-08-09 BSH Bosch und Siemens Hausgeräte GmbH Backofen
GB2466160B (en) * 2007-10-09 2011-09-14 Acp Inc Air circuit for cooking appliance including combination heating system
ES2574626T3 (es) * 2009-12-31 2016-06-21 Arçelik Anonim Sirketi Horno con conducto de ventilación
DE102012204234A1 (de) 2012-03-16 2013-09-19 BSH Bosch und Siemens Hausgeräte GmbH Mikrowellen-Kombigerät mit einem Gebläse zur Kühlung
BR102015007430A2 (pt) * 2015-04-01 2016-11-22 Electrolux Do Brasil Sa aparelho de cocção compreendendo pelo menos um dispositivo eletrônico e pelo menos um meio de refrigeração
DE102015225581A1 (de) * 2015-12-17 2017-06-22 Convotherm Elektrogeräte GmbH Verfahren zum Betreiben eines gewerblichen Gargeräts
DE102019209075A1 (de) * 2019-06-24 2020-12-24 BSH Hausgeräte GmbH Betreiben eines Haushalts-Gargeräts mit Kühllüfter
KR20210106290A (ko) 2020-02-20 2021-08-30 엘지전자 주식회사 조리기기 및 그 제어방법
EP4033319A1 (fr) 2021-01-22 2022-07-27 Siemens Aktiengesellschaft Procédé mis en uvre par ordinateur et dispositif de résolution de boucles fermées en analyse arborescente automatique des défaillances d'un système à plusieurs composants
DE102022119502A1 (de) 2022-08-03 2024-02-08 Welbilt Deutschland GmbH Gargerät

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2309038B2 (de) * 1973-02-23 1977-06-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Bratofen mit einem geblaese
JPS57170494A (en) * 1981-04-13 1982-10-20 Matsushita Electric Ind Co Ltd Heater
FR2603667B1 (fr) * 1986-09-10 1990-09-28 Etri Sa Ventilateur centrifuge entraine par un moteur a courant continu et a commutation electronique
US4885984A (en) * 1988-09-19 1989-12-12 Franceus Paul E Radon removal apparatus
DE3839659A1 (de) * 1988-11-24 1990-05-31 Boehringer Ingelheim Kg Verwendung von benzomorphanen zur zytoprotektion
DE9002208U1 (fr) * 1990-02-24 1991-07-04 Siegenia-Frank Kg, 5900 Siegen, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20090611A1 (it) * 2009-08-04 2011-02-05 Indesit Co Spa Metodo per controllare il funzionamento di un forno
EP2287533A1 (fr) * 2009-08-04 2011-02-23 Indesit Company, S.p.A. Méthode pour contrôler le fonctionnement d'un four

Also Published As

Publication number Publication date
EP0579074A1 (fr) 1994-01-19
DE4222092A1 (de) 1994-01-13
DE59302328D1 (de) 1996-05-30

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