EP1816402A2 - Oven - Google Patents

Oven Download PDF

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Publication number
EP1816402A2
EP1816402A2 EP07100211A EP07100211A EP1816402A2 EP 1816402 A2 EP1816402 A2 EP 1816402A2 EP 07100211 A EP07100211 A EP 07100211A EP 07100211 A EP07100211 A EP 07100211A EP 1816402 A2 EP1816402 A2 EP 1816402A2
Authority
EP
European Patent Office
Prior art keywords
switch room
housing
cooling
cooling fan
oven
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
EP07100211A
Other languages
German (de)
French (fr)
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EP1816402A3 (en
EP1816402B1 (en
Inventor
Martin Steinbeck
Thomas Pisek
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to PL07100211T priority Critical patent/PL1816402T3/en
Publication of EP1816402A2 publication Critical patent/EP1816402A2/en
Publication of EP1816402A3 publication Critical patent/EP1816402A3/en
Application granted granted Critical
Publication of EP1816402B1 publication Critical patent/EP1816402B1/en
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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
    • F24C15/006—Arrangements for circulation of cooling air
    • 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
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • 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
    • 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
    • H05B6/6402—Aspects relating to the microwave cavity
    • 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
    • H05B6/642—Cooling of the microwave components and related air circulation systems

Definitions

  • the invention relates to an oven with a thermal heating elements having cooking chamber and a switch room in which heat-sensitive components are arranged on the one hand and in which switch room on the other hand, a ventilation technically remotely from the rest of the switch room largely separated flow channel or housing for receiving thermally highly stressed and heat-sensitive components Microwave device is arranged, this housing is individually associated with a cooling fan and another cooling fan is arranged in the switch room outside of said flow channel and both cooling devices are operated by control means for continued cooling operation during a follow-up phase after completion of the heating and / or cooking operation.
  • the present invention has for its object to provide an oven of the type mentioned in such a way that the cooling system for the switch room and the housing of the microwave device associated flow channel is structurally inexpensive and cost-effective and minimizing the device user disturbing properties such as strong and long-term After-run fan noise after completion of the actual oven operation, disturbing air currents and the like allow.
  • the thermally correlated and yet fluidly largely separate arrangement of switch room and housing is used to create a simple control device, namely with the control element with the temperature sensor in the switch room, an effective cooling system that - in contrast to a time - on the Responding in the switch room prevailing current temperature and accordingly only when or reaching a safety-related limit temperature, the cooling lag phase ends.
  • the inventive control in particular by the indirect thermal coupling between the switch room and housing the follow-up time, combined with a reduction of ventilation noise and disturbing air flow.
  • a time-bound control device is provided which keeps the cooling fan operating for a minimum follow-up time independently of the thermostatic control element.
  • the minimum follow-up time will be shorter than the controlled by means of the temperature sensor total follow-up time with the exception of the solo microwave operation without thermal heating elements, in which there is no significant increase in temperature in the switch room.
  • the thermostatic control element is adjustable to different, depending on the operating mode and the respective degree of heating of the oven shutdown temperatures. This is the length of the cooling-lag phase Depending on the selected mode of operation, so limited to the borderline most necessary.
  • the invention will be explained with reference to the embodiment shown in the drawing below.
  • the figure shows a perspective view of the open top of a non-illustrated oven.
  • the top floor of the oven shown in the drawing forms a switch room (1) which is surrounded on both sides by dashed lines shown side walls (2), the back by a dashed lines shown back wall (3) and upwards by a cover plate (4 ).
  • this switch room (1) housed electrical and / or electronic components for the control and regulation of so-called conventional heating elements such as a top heat / grill and bottom heat below a cooking chamber, not shown, immediately below the switch room (1), separated by a base plate (25) is placed.
  • the oven should therefore be equipped with all conceivable heating elements for conventional oven operation including recirculation mode and possibly also pyrolytic self-cleaning operation.
  • Basis of this switch room (1) is the base plate (25).
  • the oven is also set up for the microwave operation
  • a microwave generator with a magnetron (6), designed as a radial fan cooling fan (7), at its pressure side to the magnetron (6) leading air duct ( 8), and with an inverter power supply of the microwave generator, which is arranged inside a housing (9).
  • the heated cooling air flow (12) flowing around the magnetron passes into an exhaust air shaft (11) arranged in the area of the front side (10) of the oven and from here into the open air. This cooling air flow is illustrated by parts (12).
  • a cooling fan (13) which is designed as a cross-flow fan and directly the switch room (1) flowing through cooling air flows generated according to arrow 21, and other components and component groups that are used in the usual way in such ovens.
  • the cooling fan (7) is connected with its suction side directly to the end face (14) of the housing (9), while the cooling fan (13) on a longitudinal side (15) of the housing (9).
  • the housing (9) itself is located directly on the back of the oven and thus also the switch room (1), so that its Air inlets (16, 17, 18) are connected directly to the outside air at the back of the oven.
  • three corresponding air inlet openings z. B. provided in the form of a hole group.
  • the housing (9) has a plurality of air outlet openings, which communicate with the suction side of the cooling fan (7) and an air outlet opening (20) in the form of a hole group, which face the suction side of the cooling fan.
  • the housing (9) consists of two composable moldings, which represent the bottom and the top of the housing (9).
  • the housing (9) has behind the air inlet openings (16, 17, 18) air guide elements, which in total z. B. form three substantially mutually parallel channel sections for the incoming from the outside in the direction of arrow 24 cooling air.
  • the air outlet openings (20) are arranged in the immediate vicinity of the suction side of the cooling fan (13) and serve for additional heat dissipation from the area of the inverter power supply of the microwave generator.
  • the housing (9) within the switch room (1) is arranged and forms a flow channel together with the cooling fan (7), the air shaft (8), the magnetron (6) and a leading to the outside, on the front of the appliance (10) ending duct, from which the cooling air flow (21) exits the oven.
  • the cooling fan (13) generates Cooling air streams (21) from the switch room (1) to dissipate the heat generated during oven operation to the front (10) towards the purpose of cooling the components located in the switch room (1) and for cooling the side walls (2) of the oven, which heat sensitive Kitchen furniture can be immediately adjacent.
  • a temperature sensor (26) at the front end of the switch room (1) a respective current image of the temperature in the housing (9).
  • the temperature sensor (26) may be placed on a control board for the general oven control.
  • a time-bound control device is provided, which from the end of the actual functional operation of the oven either in case of failure of the thermostatic control element or as a result of too short activation of this control element z.
  • the thermostatic control element is adjustable to different, depending on the operating mode and the respective degree of heating of the oven shutdown temperatures.
  • the only constant remaining is the aforementioned auxiliary or, if necessary, time control, while the usually longer temperature-dependent follow-up time depends on the currently measured temperature on the temperature sensor (26) in the switch room (1) and thus also in the correlating housing (9), d. H. shorter in most cooking modes of the oven and safer in particular with respect to the cooling function than z.

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  • 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)

Abstract

The oven has a switching space (1), in which heat sensitive components are arranged on one side. A cooling fan (7) is attached to a housing (9) for accommodating heat sensitive components of a microwave device. Another fan (13) is arranged in the space outside of a flow channel, where fans are operable by a control unit for continuous cooling operation, during a lagging phase after completion of heating or cooking operation. A thermostatic control body controls the fans during the lagging phase, where a temperature sensor (26) of the body is arranged in the space outside of the housing.

Description

Die Erfindung bezieht sich auf einen Backofen mit einem thermische Heizelemente aufweisenden Garraum und mit einem Schalterraum, in dem einerseits wärmeempfindliche Bauelemente angeordnet sind und in welchem Schalterraum andererseits ein lüftungstechnisch vom Übrigen Schalterraum weitgehend separierter Strömungskanal oder Gehäuse für die Aufnahme von thermisch hochbelasteten und wärmeempfindlichen Bauelementen einer Mikrowelleneinrichtung angeordnet ist, wobei diesem Gehäuse individuell ein Kühlgebläse zugeordnet ist und ein weiteres Kühlgebläse im Schalterraum außerhalb des genannten Strömungskanals angeordnet ist und beide Kühlgeräte durch Steuermittel zum fortgesetzten Kühlbetrieb während einer Nachlaufphase nach Beendigung des Heiz- und/oder Garbetriebs betreibbar sind.The invention relates to an oven with a thermal heating elements having cooking chamber and a switch room in which heat-sensitive components are arranged on the one hand and in which switch room on the other hand, a ventilation technically remotely from the rest of the switch room largely separated flow channel or housing for receiving thermally highly stressed and heat-sensitive components Microwave device is arranged, this housing is individually associated with a cooling fan and another cooling fan is arranged in the switch room outside of said flow channel and both cooling devices are operated by control means for continued cooling operation during a follow-up phase after completion of the heating and / or cooking operation.

Bei bekannten Backöfen zur Garbehandlung von Lebensmitteln ist es üblich die elektrischen oder elektronischen Bauelementen in einem oberhalb des Garraumes oder der Ofenmuffel angeordneten Schalterraum unterzubringen und diesen Raum z. B. mit einem so genannten Querstromgebläse zu kühlen, das heißt die Betriebswärme abzuführen. Bei Öfen mit alleiniger oder zusätzlicher Mikrowelleneinrichtung ist zur Wärmeabführung bzw. Kühlung des Mikrowellengenerators (Magnetron) üblicher Weise ein separates Kühlgebläse z. B. ein Radialgebläse vorgesehen, welches während des Mikrowellenbetriebs oder auch kurz danach die Betriebswärme in diesem separaten Gehäuse abführen soll, welche Betriebswärme bei Verwendung von so genannten Invertern, dass heißt bei Verwendung eines Hochfrequenzgenerators mit Inverternetzteil, Leistungshalbleiter und Hochspannungstransformator besonders hoch ist. Andererseits wird auch bei reinem Back- oder Bratbetrieb mit thermischen Heizelementen innerhalb des Garraumes eine starke Wärmeentwicklung stattfinden insbesondere dann, wenn der Backofen auch mit einer Einrichtung für den so genannten pyrolytischen Selbstreinigungsbetrieb ausgerüstet ist, bei welchem Selbstreinigungsbetrieb etwa 400°C anfallen. Während dem Backofenbetrieb und auch nach Beendigung desselben findet durch Wärmeleitung noch ein beträchtlicher Transport der vorerwähnten Wärmeenergie innerhalb des Backofengehäuses bis zum vorerwähnten Schalterraum statt, so dass auch nach Beendigung einer Hochtemperaturbetriebs zum Schutz der in diesem angeordneten Bauelemente eine erzwungene Kühlung über einen bestimmten Zeitraum aufrechterhalten werden muss, ebenso wie dies für die Wärmeabführung aus dem vorerwähnten Gehäuse für den Hochfrequenzgenerator gilt. Durch eine solche "Nachlaufkühlung" soll die angefallene Betriebswärme aus dem Schalterraum und aus dem erwähnten Gehäuse für die Mikrowelleneinrichtung gezielt nach außen, also bis außerhalb de Gehäuses, entfernt werden, um - wie erwähnt - wärmeempfindliche Bauelementen vor Beschädigung zu schützen, um auch in der unmittelbaren Umgebung des Backofens z. B. an angrenzenden Küchenmöbeln Schäden zu vermeiden und nicht zuletzt um einen dem vorhergehenden Garbetrieb unmittelbar nachfolgenden weiteren Garbetrieb oder Heizbetrieb zu ermöglichen, wozu zumindest innerhalb des Schalterraumes und des Gehäuses eine vorbestimmte Grenztemperatur nicht überschritten werden darf. Insbesondere bei einer solchen Lüfternachlaufsteuerung, also nach Beendigung des Gar- bzw. Heizbetriebes ist der Benutzer gewissen Störfaktoren ausgesetzt, wie z. B. einem störenden Lüftergeräusch, das ausgeht von den noch eingeschalteten Kühlgebläsen und ebenfalls von diesen Kühlgebläsen ausgehenden und meist an der Frontseite des Backofens austretenden störenden Luftströmungen.In known ovens for cooking treatment of food, it is common to accommodate the electrical or electronic components in a above the cooking chamber or the oven muffle arranged switch room and this room z. B. with a so-called cross-flow fan to cool, that is dissipate the heat of operation. For ovens with a single or additional microwave device for heat dissipation or cooling of the microwave generator (magnetron) is usually a separate cooling fan z. Example, a radial fan is provided, which is to dissipate the operating heat in this separate housing during microwave operation or shortly thereafter, which operating heat when using so-called inverters, that is when using a high-frequency generator with inverter power supply, power semiconductor and high voltage transformer is particularly high. On the other hand, even with pure baking or roasting operation with thermal heating elements within the cooking chamber a strong heat development will take place, especially if the oven is also equipped with a device for the so-called pyrolytic self-cleaning operation, in which self-cleaning operation about 400 ° C incurred. During the oven operation and after the end of the same takes place by heat conduction still a considerable transport of the aforementioned heat energy within the oven housing to the aforementioned switch room, so that maintained even after completion of a high-temperature operation to protect the arranged in this device forced cooling over a period of time must be, just as it applies to the heat dissipation from the aforementioned housing for the high frequency generator. By such a "follow-up cooling", the heat of operation incurred from the switch room and from the mentioned housing for the microwave device to the outside, ie to outside the housing to be removed to - as mentioned - heat-sensitive devices to protect against damage, even in the immediate environment of the oven z. B. to adjacent kitchen furniture to avoid damage and not least to allow the previous Garbetrieb immediately following further cooking operation or heating, including at least within the switch room and the housing a predetermined limit temperature may not be exceeded. In particular, in such a Lüfternachlaufsteuerung, ie after completion of the cooking or heating operation, the user is exposed to certain disturbing factors, such. As a disturbing fan noise, which emanates from the still switched on cooling fans and also emanating from these cooling fans and usually exiting on the front of the oven disturbing air currents.

Bei einem anderen bekannten Backofen mit kombiniertem Garbetrieb einschließlich Mikrowelle ( DE 38 25 122 A1 ) sind für die Wärmeabführung aus einem Schalterraum oberhalb eines Garraumes und einer Mikrowelleneinrichtung zwei Kühlgebläse und damit verbunden zwei lufttechnisch und örtlich durch eine Schnittstelle vollständig voneinander getrennte und voneinander völlig unabhängige Kühlkreisläufe vorgesehen, die einer individuellen Steuerung der Kühlgebläse und Kühlkreisläufe bedürfen.In another known combined cooking oven including microwave ( DE 38 25 122 A1 ) are provided for the heat dissipation from a switch room above a cooking chamber and a microwave device, two cooling fans and associated two air-technically and locally by an interface completely separate and completely independent cooling circuits, which require individual control of the cooling fan and cooling circuits.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Backofen der eingangs genannten Art so auszugestalten, dass das Kühlsystem für den Schalterraum und für das Gehäuse des der Mikrowelleneinrichtung zugeordneten Strömungskanals konstruktiv unaufwendig und kostensparend eingerichtet ist und eine Minimierung der den Gerätebenutzer störenden Eigenschaften wie starke und langzeitige Nachlauf-Lüftergeräusche nach Beendigung des eigentlichen Backofensbetriebes, störende Luftströmungen und dergleichen ermöglichen.The present invention has for its object to provide an oven of the type mentioned in such a way that the cooling system for the switch room and the housing of the microwave device associated flow channel is structurally inexpensive and cost-effective and minimizing the device user disturbing properties such as strong and long-term After-run fan noise after completion of the actual oven operation, disturbing air currents and the like allow.

Diese Aufgabe wird erfindungsgemäß bei einem Backofen der eingangs genannten Art dadurch gelöst, dass für die Steuerung beider Kühlgebläse zumindest während der Nachlaufphase ein thermostatisches Steuerorgan vorgesehen ist, dessen einziger Temperaturfühler im Schalterraum außerhalb des Gehäuses angeordnet ist.This object is achieved with an oven of the type mentioned in that for the control of both cooling fans at least during the After-running phase, a thermostatic control element is provided, the single temperature sensor is arranged in the switch room outside the housing.

Versuche haben ergeben, dass zwischen den Temperaturverhältnissen im relativ großräumigen Schalterraum in dem in diesem Schalterraum angeordneten relativ eng begrenzten Gehäuseraum oder Strömungskanal eine starke thermische Korrelation besteht, insofern, als die jeweils im Schalterraum herrschende Temperatur auch ein Abbild der jeweils herrschenden Temperatur im Gehäuse wiedergibt. Im Gegensatz zu dem eingangs genannten Lösungsvorschlag gemäß DE 38 25 122 A1 wird erfindungsgemäß die thermisch korrelierende und doch strömungstechnisch weitgehend getrennte Anordnung von Schalterraum und Gehäuse dazu benutzt, um mit einer einfachen Steuereinrichtung, nämlich mit dem Steuerorgan mit dem Temperaturfühler im Schalterraum, ein wirksames Kühlsystem zu schaffen, das - im Gegensatz zu einer Zeitsteuerung - auf die im Schalterraum herrschende jeweils aktuelle Temperatur reagiert und entsprechend erst oder schon bei Erreichen einer sicherheitstechnischen Grenztemperatur die Kühl-Nachlaufphase beendet. Im Vergleich mit an sich bekannten Zeitsteuerungen in der genannten Nachlaufphase kann durch die erfindungsgemäße Steuerung, insbesondere durch die indirekte thermische Kopplung zwischen Schalterraum und Gehäuse die Nachlaufzeit wesentlich verkürzt werden, verbunden mit einer Reduzierung von Lüftungsgeräusch und störender Luftströmung.Experiments have shown that between the temperature conditions in the relatively large-scale switch room in the arranged in this switch room relatively narrow housing space or flow channel, a strong thermal correlation exists, insofar as each prevailing in the switch room temperature also reflects an image of each prevailing temperature in the housing. In contrast to the proposed solution according to DE 38 25 122 A1 According to the invention, the thermally correlated and yet fluidly largely separate arrangement of switch room and housing is used to create a simple control device, namely with the control element with the temperature sensor in the switch room, an effective cooling system that - in contrast to a time - on the Responding in the switch room prevailing current temperature and accordingly only when or reaching a safety-related limit temperature, the cooling lag phase ends. In comparison with known timing controls in said follow-up phase can be significantly shortened by the inventive control, in particular by the indirect thermal coupling between the switch room and housing the follow-up time, combined with a reduction of ventilation noise and disturbing air flow.

Insbesondere aus Sicherheitsgründen ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass zusätzlich zum thermostatischen Steuerorgan eine zeitgebundene Steuereinrichtung vorgesehen ist, die unabhängig vom thermostatischen Steuerorgan die Kühlgebläse während einer Mindest-Nachlaufzeit in Betrieb hält. Dabei wird bei den meisten Backofen-Betriebsarten mit thermischen Heizelementen die Mindest-Nachlaufzeit kürzer sein als die mit Hilfe des Temperaturfühlers gesteuerte Gesamt-Nachlaufzeit etwa mit Ausnahme des Solo-Mikrowellenbetriebs ohne thermische Heizelemente, bei dem im Schalterraum keine wesentliche Temperaturerhöhung stattfindet.In particular, for safety reasons, according to a development of the invention, it is provided that, in addition to the thermostatic control element, a time-bound control device is provided which keeps the cooling fan operating for a minimum follow-up time independently of the thermostatic control element. In this case, in most oven operating modes with thermal heating elements, the minimum follow-up time will be shorter than the controlled by means of the temperature sensor total follow-up time with the exception of the solo microwave operation without thermal heating elements, in which there is no significant increase in temperature in the switch room.

Gemäß einer weiteren Fortbildung der Erfindung ist das thermostatische Steuerorgan auf unterschiedliche, von der Betriebsart und dem jeweiligen Erhitzungsgrad des Garraumes abhängige Abschalttemperaturen einstellbar. Hierdurch ist die Länge der Kühl-Nachlaufphase von der gewählten Betriebsart abhängig, also auf das jeweils grenzwertig notwendigste beschränkt.According to a further development of the invention, the thermostatic control element is adjustable to different, depending on the operating mode and the respective degree of heating of the oven shutdown temperatures. This is the length of the cooling-lag phase Depending on the selected mode of operation, so limited to the borderline most necessary.

Die Erfindung wird anhand des in der Zeichnung dargestellten Ausführungsbeispieles nachstehend erläutert. Die Figur zeigt eine perspektivische Darstellung der offenen Oberseite eines nicht weiter dargestellten Backofens.The invention will be explained with reference to the embodiment shown in the drawing below. The figure shows a perspective view of the open top of a non-illustrated oven.

Die in der Zeichnung gezeigte oberste Etage des Backofens bildet einen Schalterraum (1), der an beiden Seiten umgeben ist von nur gestrichelt dargestellten Seitenwänden (2), rückseitig durch eine ebenfalls gestrichelt dargestellte Rückwand (3) und nach oben hin durch eine Deckplatte (4). In diesem Schalterraum (1) untergebracht sind elektrische und/oder elektronische Bauelemente für die Steuerung und Regelung von so genannten konventionellen Heizelementen wie eine Oberhitze/Grill und Unterhitze unterhalb eines nicht dargestellten Garraumes, der unmittelbar unterhalb des Schalterraumes (1), getrennt durch eine Grundplatte (25) platziert ist. Der Backofen soll also ausgerüstet sein mit sämtlichen denkbaren Heizelementen für den konventionellen Ofenbetrieb einschließlich Umluftbetrieb und gegebenenfalls auch pyrolytischem Selbstreinigungsbetrieb. Basis dieses Schalterraumes (1) ist die Grundplatte (25). Da der Backofen auch für den Mirkowellenbetrieb eingerichtet ist, ist im Schalterraum (1) ferner ein Mikrowellengenerator angeordnet, mit einem Magnetron (6), mit einem als Radiallüfter ausgebildeten Kühlgebläses (7), an dessen Druckseite ein zum Magnetron (6) führender Luftschacht (8) angeordnet ist, sowie mit einem Inverternetzteil des Mikrowellengenerators, welcher innerhalb eines Gehäuses (9) angeordnet ist. Der das Magnetron umströmende, erwärmte Kühlluftstrom (12) gelangt in einen im Bereich der Frontseite (10) des Backofens angeordneten Abluftschacht (11) und von hier aus ins Freie. Dieser Kühlluftstrom ist durch Teile (12) verdeutlicht. Ferner sind im Schalterraum (1) untergebracht ein Kühlgebläse (13), das als Querstromlüfter ausgebildet ist und das unmittelbar den Schalterraum (1) durchströmende Kühlluftströme gemäß Pfeil 21 generiert, sowie weitere Bauelemente und Bauelementegruppen, die in üblicher Weise bei derartigen Backöfen verwendet werden. Wie ferner gezeigt, ist das Kühlgebläse (7) mit seiner Saugseite unmittelbar an die Stirnseite (14) des Gehäuses (9) angeschlossen, während sich das Kühlgebläse (13) an einer Längsseite (15) des Gehäuses (9) befindet. Das Gehäuse (9) selbst ist unmittelbar an der Rückseite des Backofens und damit auch des Schalterraumes (1) angeordnet, so dass seine Lufteintrittsöffnungen (16, 17, 18) an der Ofenrückseite unmittelbar an die Außenluft angeschlossen sind. Hierzu sind in der Rückwand drei entsprechende Lufteintrittsöffnungen z. B. in Form einer Lochgruppe vorgesehen.The top floor of the oven shown in the drawing forms a switch room (1) which is surrounded on both sides by dashed lines shown side walls (2), the back by a dashed lines shown back wall (3) and upwards by a cover plate (4 ). In this switch room (1) housed electrical and / or electronic components for the control and regulation of so-called conventional heating elements such as a top heat / grill and bottom heat below a cooking chamber, not shown, immediately below the switch room (1), separated by a base plate (25) is placed. The oven should therefore be equipped with all conceivable heating elements for conventional oven operation including recirculation mode and possibly also pyrolytic self-cleaning operation. Basis of this switch room (1) is the base plate (25). Since the oven is also set up for the microwave operation, in the switch room (1) is further arranged a microwave generator, with a magnetron (6), designed as a radial fan cooling fan (7), at its pressure side to the magnetron (6) leading air duct ( 8), and with an inverter power supply of the microwave generator, which is arranged inside a housing (9). The heated cooling air flow (12) flowing around the magnetron passes into an exhaust air shaft (11) arranged in the area of the front side (10) of the oven and from here into the open air. This cooling air flow is illustrated by parts (12). Furthermore, in the switch room (1) housed a cooling fan (13), which is designed as a cross-flow fan and directly the switch room (1) flowing through cooling air flows generated according to arrow 21, and other components and component groups that are used in the usual way in such ovens. As further shown, the cooling fan (7) is connected with its suction side directly to the end face (14) of the housing (9), while the cooling fan (13) on a longitudinal side (15) of the housing (9). The housing (9) itself is located directly on the back of the oven and thus also the switch room (1), so that its Air inlets (16, 17, 18) are connected directly to the outside air at the back of the oven. For this purpose, three corresponding air inlet openings z. B. provided in the form of a hole group.

Wie die Zeichnung ferner zeigt, besitzt das Gehäuse (9) mehrere Luftaustrittsöffnungen, die mit der Saugseite des Kühlgebläses (7) kommunizieren sowie eine Luftaustrittsöffnung (20) in Form einer Lochgruppe, die der Saugseite des Kühlgebläses zugewandt sind. Das Gehäuse (9) besteht aus zwei zusammensetzbaren Formteilen, die die Unterseite und die Oberseite des Gehäuses (9) darstellen. Das Gehäuse (9) besitzt hinter den Lufteintrittsöffnungen (16, 17, 18) Luftleitelemente, welche insgesamt z. B. drei im Wesentlichen parallel zueinander verlaufende Kanalabschnitte für die von außen her in Pfeilrichtung 24 einströmende Kühlluft bilden. Anschließend an diese Kanalabschnitte und Luftleitelemente befinden sich weitere Luftleitelemente, durch welche die in den Kanalabschnitten herangeführte Kühlluft (Pfeile 24) verteilt wird in Richtung von thermisch hochbelasteten und daher zu kühlenden Bauelementen des Mikrowellengenerators d. h. seines Inverters z. B. in Richtung einer Hochfrequenzspule eines Kühlkörpers des Inverternetzteiles sowie in Richtung einer Platine des Inverternetzteiles, welche Platine im Unterteil des Gehäuses (9) mit Abstand zu den Gehäuseenden angeordnet ist, so dass die Kühlluftströmung beide Platinenseiten umstreichen kann. Durch die strömungstechnische Ankopplung der im Inneren des Gehäuses (9) strömenden Kühlluftströme über die Luftaustrittsöffnungen z. B. 20 an die Saugseiten der beiden Kühlluftgebläse (7, 13) sowie durch das Vorhandensein der vorgenannten Luftleitelemente erhält man wenigstens zwei im Wesentlichen senkrecht aufeinander stehende Luftströmungen in Richtung der Pfeile 31 des Kühlgebläses (7) und in Pfeilrichtung 32 in Richtung zum Kühlgebläse (13) hin. Die Luftaustrittsöffnungen (20) sind in unmittelbarer Nähe der Saugseite des Kühlgebläses (13) angeordnet und dienen zur zusätzlichen Wärmeabführung aus dem Bereich des Inverternetzteiles des Mikrowellengenerators.As the drawing also shows, the housing (9) has a plurality of air outlet openings, which communicate with the suction side of the cooling fan (7) and an air outlet opening (20) in the form of a hole group, which face the suction side of the cooling fan. The housing (9) consists of two composable moldings, which represent the bottom and the top of the housing (9). The housing (9) has behind the air inlet openings (16, 17, 18) air guide elements, which in total z. B. form three substantially mutually parallel channel sections for the incoming from the outside in the direction of arrow 24 cooling air. Subsequent to these channel sections and air guide elements there are further air guide elements, by means of which the cooling air (arrows 24) introduced in the channel sections is distributed in the direction of thermally highly loaded and therefore to be cooled components of the microwave generator d. H. his inverter z. B. in the direction of a high frequency coil of a heat sink of the inverter power supply and in the direction of a board of the inverter power supply, which board in the lower part of the housing (9) is arranged at a distance from the housing ends, so that the cooling air flow can sweep both sides of the board. By the fluidic coupling of the inside of the housing (9) flowing cooling air flows through the air outlet openings z. B. 20 to the suction sides of the two cooling air blower (7, 13) and by the presence of the aforementioned air guide is obtained at least two substantially mutually perpendicular air flows in the direction of the arrows 31 of the cooling fan (7) and in the direction of arrow 32 towards the cooling fan ( 13). The air outlet openings (20) are arranged in the immediate vicinity of the suction side of the cooling fan (13) and serve for additional heat dissipation from the area of the inverter power supply of the microwave generator.

Wie weiterhin in der Zeichnung gezeigt, ist das Gehäuse (9) innerhalb des Schalterraumes (1) angeordnet und bildet einen Strömungskanal zusammen mit dem Kühlgebläse (7), dem Luftschacht (8), dem Magnetron (6) und einem ins Freie führenden, an der Gerätefrontseite (10) endenden Luftschacht, aus dem die Kühlluftströmung (21) aus dem Backofen austritt. Dem gegenüber generiert das Kühlgebläse (13) Kühlluftströme (21), die aus dem Schalterraum (1) die bei Backofenbetrieb anfallende Betriebswärme zur Frontseite (10) hin abführen sollen zum Zwecke der Kühlung der im Schalterraum (1) befindlichen Bauelemente und zur Kühlung der Seitenwände (2) des Backofens, denen wärmeempfindliche Küchenmöbel unmittelbar benachbart sein können.As further shown in the drawing, the housing (9) within the switch room (1) is arranged and forms a flow channel together with the cooling fan (7), the air shaft (8), the magnetron (6) and a leading to the outside, on the front of the appliance (10) ending duct, from which the cooling air flow (21) exits the oven. In contrast, the cooling fan (13) generates Cooling air streams (21) from the switch room (1) to dissipate the heat generated during oven operation to the front (10) towards the purpose of cooling the components located in the switch room (1) and for cooling the side walls (2) of the oven, which heat sensitive Kitchen furniture can be immediately adjacent.

Durch die genannte Korrelation der Temperatur im Schalterraum (1) und im thermisch hochbelastetem Gehäuse (9) erhält man an einem Temperaturfühler (26) am frontseitigen Ende des Schalterraumes (1) ein jeweils aktuelles Abbild der Temperatur im Gehäuse (9). Der Temperaturfühler (26) kann auf einer Steuerplatine für die allgemeine Backofensteuerung platziert sein. Insbesondere aus Sicherheitsgründen kann vorgesehen sein, dass zusätzlich zu dem thermostatischen Steuerorgan mit Temperaturfühler (26) eine zeitgebundene Steuereinrichtung vorgesehen ist, die ab Beendigung des eigentlichen Funktionsbetriebs des Backofens entweder bei Ausfall des thermostatischen Steuerorgans oder aber infolge zu kurzzeitiger Aktivierung dieses Steuerorgans z. B. mangels wesentlicher Erhitzung des Garraumes und entsprechenden Temperatur-Nachschubes bei reinem Mikrowellen-Betrieb desselben den Betrieb des Kühlsystems d. h. den Betrieb der Kühlgebläse (7, 13) während einer Mindest-Nachlaufzeit entsprechend vor bestimmter Grenzwert-Temperaturen aufrecht hält.By said correlation of the temperature in the switch room (1) and in the thermally highly loaded housing (9) is obtained at a temperature sensor (26) at the front end of the switch room (1) a respective current image of the temperature in the housing (9). The temperature sensor (26) may be placed on a control board for the general oven control. In particular, for safety reasons, it may be provided that in addition to the thermostatic control element with temperature sensor (26) a time-bound control device is provided, which from the end of the actual functional operation of the oven either in case of failure of the thermostatic control element or as a result of too short activation of this control element z. B. in the absence of substantial heating of the cooking chamber and corresponding temperature replenishment in pure microwave operation of the same the operation of the cooling system d. H. the operation of the cooling fan (7, 13) during a minimum follow-up time keeps upright before certain threshold temperatures.

Vorzugsweise ist das thermostatische Steuerorgan auf unterschiedliche, von der Betriebsart und dem jeweiligen Erhitzungsgrad des Garraumes abhängige Abschalttemperaturen einstellbar. Als einzige Konstante verbleibt dabei die vorgenannte hilfsweise bzw. bedarfsweise Zeitsteuerung, während die zumeist längere temperaturabhängige Nachlaufzeit von der am Temperaturfühler (26) jeweils aktuell gemessenen Temperatur im Schalterraum (1) und damit auch im korrelierendem Gehäuse (9) abhängig ist, d. h. bei den meisten Gar-Betriebsarten des Backofens kürzer und insbesondere bzgl. der Kühlfunktion sicherer ist als z. B. eine zeitgesteuerte Nachlaufkühlung.Preferably, the thermostatic control element is adjustable to different, depending on the operating mode and the respective degree of heating of the oven shutdown temperatures. The only constant remaining is the aforementioned auxiliary or, if necessary, time control, while the usually longer temperature-dependent follow-up time depends on the currently measured temperature on the temperature sensor (26) in the switch room (1) and thus also in the correlating housing (9), d. H. shorter in most cooking modes of the oven and safer in particular with respect to the cooling function than z. B. a time-controlled overrun cooling.

Claims (3)

Backofen mit einem thermische Heizelemente aufweisenden Garraum und mit einem Schalterraum (1), in dem einerseits wärmeempfindliche Bauelemente angeordnet sind und in welchem Schalterraum (1) andererseits ein lüftungstechnisch vom übrigen Schalterraum (1) weitgehend separierter Strömungskanal oder Gehäuse (9) für die Aufnahme von thermisch hochbelasteten und wärmeempfindlichen Bauelementen einer Mikrowelleneinrichtung angeordnet ist, wobei diesem Gehäuse (9) individuell ein Kühlgebläse (7) zugeordnet ist und ein weiteres Kühlgebläse (13) im Schalterraum (1) außerhalb des genannten Strömungskanals (9) angeordnet ist und beide Kühlgebläse (7, 13) durch Steuermittel zum fortgesetzten Kühlbetrieb während einer Nachlaufphase nach Beendigung des Heiz- und/oder Garbetriebs betreibbar sind, dadurch gekennzeichnet, dass für die Steuerung beider Kühlgebläse (7, 13) zumindest während der Nachlaufphase ein thermostatisches Steuerorgan vorgesehen ist, dessen einziger Temperaturfühler (26) im Schalterraum (1) außerhalb des Gehäuses (9) angeordnet ist.Oven with a cooking element having thermal heating elements and with a switch room (1) in which on the one hand heat-sensitive components are arranged and in which switch room (1) on the other hand a ventilation channel or housing (9) largely separated from the rest of the switch room (1) for receiving thermally highly loaded and heat-sensitive components of a microwave device is arranged, this housing (9) is individually associated with a cooling fan (7) and another cooling fan (13) in the switch room (1) outside of said flow channel (9) is arranged and both cooling fan (7 , 13) by control means for continued cooling operation during a follow-up phase after completion of the heating and / or Garbetriebs are operable, characterized in that for the control of both cooling fans (7, 13) at least during the follow-up phase, a thermostatic control element is provided, the single Temperatu Sensor (26) in the switch room (1) outside the housing (9) is arranged. Backofen nach Anspruch 1, dadurch gekennzeichnet, dass zusätzlich zum thermostatischen Steuerorgan eine zeitgebundene Steuereinrichtung vorgesehen ist, die unabhängig vom thermostatischen Steuerorgan die Kühlgebläse (7, 13) während einer Mindest-Nachlaufzeit in Betrieb hält.Baking oven according to claim 1, characterized in that in addition to the thermostatic control member, a time-bound control device is provided which keeps the cooling fan (7, 13) in operation for a minimum follow-up time independently of the thermostatic control member. Backofen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das thermostatische Steuerorgan auf unterschiedliche, von der Betriebsart und dem jeweiligen Erhitzungsgrad des Garraumes abhängige Abschalttemperaturen einstellbar ist.Baking oven according to one of the preceding claims, characterized in that the thermostatic control member is adjustable to different, depending on the operating mode and the respective degree of heating of the cooking chamber shutdown temperatures.
EP07100211.7A 2006-02-06 2007-01-08 Oven Active EP1816402B1 (en)

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EP2031308A1 (en) * 2007-09-03 2009-03-04 BSH Bosch und Siemens Hausgeräte GmbH Household device control device
EP2151631A1 (en) * 2008-07-17 2010-02-10 BSH Bosch und Siemens Hausgeräte GmbH Cooking oven
ITTO20090611A1 (en) * 2009-08-04 2011-02-05 Indesit Co Spa METHOD TO CHECK THE FUNCTIONING OF AN OVEN
FR2965331A1 (en) * 2010-09-27 2012-03-30 Fagorbrandt Sas Method for controlling operation of baking oven i.e. domestic baking oven, involves controlling starting and stopping of cooling ventilator according to crossing of predetermined temperature threshold of baking oven
WO2013135528A1 (en) * 2012-03-16 2013-09-19 BSH Bosch und Siemens Hausgeräte GmbH Microwave combination device with a fan for cooling
EP3869105A1 (en) * 2020-02-20 2021-08-25 LG Electronics Inc. Cooking appliance and control method thereof

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CN105283050B (en) * 2015-11-19 2018-08-10 珠海格力电器股份有限公司 Heat radiation structure for induction cooker or electric pressure cooker, electric appliance box and induction cooker

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Publication number Priority date Publication date Assignee Title
EP2031308A1 (en) * 2007-09-03 2009-03-04 BSH Bosch und Siemens Hausgeräte GmbH Household device control device
EP2151631A1 (en) * 2008-07-17 2010-02-10 BSH Bosch und Siemens Hausgeräte GmbH Cooking oven
ITTO20090611A1 (en) * 2009-08-04 2011-02-05 Indesit Co Spa METHOD TO CHECK THE FUNCTIONING OF AN OVEN
EP2287533A1 (en) * 2009-08-04 2011-02-23 Indesit Company, S.p.A. Method for controlling the operation of an oven
FR2965331A1 (en) * 2010-09-27 2012-03-30 Fagorbrandt Sas Method for controlling operation of baking oven i.e. domestic baking oven, involves controlling starting and stopping of cooling ventilator according to crossing of predetermined temperature threshold of baking oven
WO2013135528A1 (en) * 2012-03-16 2013-09-19 BSH Bosch und Siemens Hausgeräte GmbH Microwave combination device with a fan for cooling
EP3869105A1 (en) * 2020-02-20 2021-08-25 LG Electronics Inc. Cooking appliance and control method thereof
US11965655B2 (en) 2020-02-20 2024-04-23 Lg Electronics Inc. Cooking appliance and control method thereof

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PL1816402T3 (en) 2014-08-29
EP1816402A3 (en) 2008-06-11
ES2460992T3 (en) 2014-05-16
DE102006005293A1 (en) 2007-08-09
EP1816402B1 (en) 2014-04-16

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