EP1036990B1 - Device for preparing food, in particular baking oven for steam cooking - Google Patents

Device for preparing food, in particular baking oven for steam cooking Download PDF

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Publication number
EP1036990B1
EP1036990B1 EP00102144A EP00102144A EP1036990B1 EP 1036990 B1 EP1036990 B1 EP 1036990B1 EP 00102144 A EP00102144 A EP 00102144A EP 00102144 A EP00102144 A EP 00102144A EP 1036990 B1 EP1036990 B1 EP 1036990B1
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EP
European Patent Office
Prior art keywords
switched
fan
temperature
cooking
lighting equipment
Prior art date
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EP00102144A
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German (de)
French (fr)
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EP1036990A3 (en
EP1036990A2 (en
Inventor
Frank Dr. Rödelsperger
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1036990A3 publication Critical patent/EP1036990A3/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00Details
    • F24C15/008Illumination for oven cavities
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00Details
    • F24C15/32Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/327Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the invention relates to a device for preparing food, in particular Steam cooker, with an oven muffle, comprising an im heating source required for each operation as well as to the heating source additional heat sources, such as a lighting device arranged in the cooking space to illuminate the cooking space and / or a fan for circulating air or hot air operation.
  • Steamers are facilities where food is in hot steam can be cooked. When operating the steam cooker the cooking chamber is filled with steam, by a steam generator unit that is in the cooking space or can be arranged outside of this is generated. Combined steam cookers are also common, in which other operating phases, for example a hot air operation for baking or roasting. steam cookers are in the European patent application EP 0894460 A1 and the publications mentioned therein described. Other variants of steam cookers with a steam cooker, also for cooking food without pressure are essentially made up of a Pool in which water is heated, being in the Basin-fed dishes either through the water or the steam is cooked. Such steamers are for example in the German patent application DE 19726677 A1.
  • Ovens are ovens in which food is cooked in a cooking space become.
  • the cooking space is of an oven muffle, in which the food to be cooked can be brought in, enclosed and has a door to open and close the cooking compartment.
  • an oven Devices can use different cooking techniques individually or in Combination can be applied. These include, for example the top and / or bottom heat, a grill device, a hot air operation, a microwave or that Steam cooking. In the latter case, the oven is called one. Steam oven.
  • the lighting device for steam ovens and other ovens at the same time switched on with the heating source provided for the cooking process and switched off together with this.
  • the lighting device is therefore always in operation albeit the oven to prepare a dish used and supplied with energy for this, and will together with the heating or the cooking device used switched off.
  • incandescent lamps are usually used for the lighting of cooking rooms of ovens incandescent lamps as lighting devices used.
  • the energy consumption of these lamps is typically in the range between 5 and 80 W.
  • Ovens can also be several, in different places Arranged incandescent lamps are used, which on the one hand the lighting even if a light bulb fails secured and on the other hand a more even and with less shadowing illumination of the cooking space is achieved.
  • the present invention takes this state into account the technology is based on the object of a device for preparing food create that operated at low temperatures and its temperature, especially at low temperatures, can be regulated more precisely.
  • the device has a control device by means of which the heat source during operation of the Device depending on the cooking space temperature is adjustable.
  • the Fan of the circulating air or hot air device to the Heating of the cooking space helps, even if the hot air heating is switched off.
  • the warming is based on im Findings found within the scope of the invention are not primarily on the heat loss of the electric motor with which the fan is driven but on the mechanical one Power output of the motor shaft. This is typically in the range of 25 W and is over in the cooking space the fan blades are converted into air movements.
  • the lighting device and / or the Fan when operating the steam cooker, with low energy supply requirement for the cooking temperature automatically is controllable.
  • the lighting device and the fan an undesirable or disruptive for some operating modes Can represent heat source to that in each Operation required heating source is added.
  • This can also be used with other devices for preparing Food as steam cookers, for example in ovens without a steam cooker.
  • the automatic control of the lighting device and / or the fan can be done in different ways, for example by switching off, clocked on and off Switch off (if necessary with a controlled or regulated one Clock ratio) or by operation with reduced Power.
  • Another advantageous feature can be that the lighting device and / or the fan depending on the cooking space temperature, in particular depending on a specified limit of the cooking space temperature, is controlled automatically.
  • the default Limit, depending on which the lighting device is controlled automatically, lies for practical purposes advantageously between 30 ° C and 70 ° C, preferably between 50 ° C and 65 ° C.
  • the invention Control can also be carried out at higher cooking chamber temperatures to be beneficial to an operation at a exact or small fluctuations in temperature to ensure.
  • the invention is particularly for steam cookers from Advantage, since the generation and supply of the Steam can be a heat or heating source.
  • the steam generation takes place on a radiator instead of being applied to the water. If the Radiator is not or only slightly heated is not Steam generation possible, so that no high relative Humidity in the cooking space can be achieved.
  • This also applies to steam cookers with steam cookers, where the steam generation in an external water tank takes place because here too the introduction of Steam in the cooking space causes a rise in temperature, which along with the performance of the lighting device or the optionally switched on fan Hot air device is too high. With some steam cookers is the steam generator in the cooking space self-arranged.
  • steam generating devices have the conversion of the supplied water to steam is high Surface temperature, preferably above 100 ° C.
  • the Steam generation can be continuous or intermittent respectively. There is heat input through the lighting device or adding a fan is done by this Heat sources increases the temperature and makes regulation difficult.
  • An advantageous embodiment of the invention can be that the lighting device and / or the fan is switched off in the steam cooking mode becomes.
  • a first advantageous embodiment can be that the lighting device and / or the fan during of the entire operation with a low energy supply requirement for the cooking temperature is switched off.
  • a second advantageous embodiment may be that Lighting device and / or the fan during of operation with low energy requirements for the Cooking temperature is switched on and off at intervals.
  • Another advantageous embodiment may be that the lighting device and / or the fan during of operation with low energy requirements for the cooking temperature is operated with reduced power becomes.
  • the lighting device and / or the fan is automatically switched off when the actual temperature, i.e. the currently measured inside temperature of the Cooking space, falls below a predetermined limit. This ensures that at low operating temperatures the lighting device or the fan is switched off and does not contribute to warming.
  • the lighting device is switched on or the fan when exceeded the limit for an extension of the period which may elapse until the steamer again reaches a target temperature below the limit.
  • the lighting device and / or the Fan when setting a target temperature the is less than a predetermined limit, automatically is turned off. This will already be when setting the operating temperature determines whether the lighting device or the fan is switched on or off is.
  • the Control circuit influenced such that the lighting device or the fan when starting the heating below the limit is not switched on.
  • the lighting device by a delay time delayed after setting the target temperature is switched off automatically.
  • the delay time is advantageously between 0.1 and 10 seconds, preferably between 1.0 and 3.0 seconds. If the lighting device is not immediately adjusted a set temperature, but only after one Delay time is switched off, this has the Advantage that while setting the target temperature, i.e. when turning the temperature selector switch, no switch-off and the cooking compartment is still viewing by the user is illuminated. First when the setting process of the target temperature is finished, i.e. the preselected target temperature no longer changes the delay time measurement starts and after expiry the lighting device becomes the predetermined delay time switched off.
  • Another, advantageous in all embodiments Feature may be that the lighting device when operating a control element of the Oven automatically switched on and after completion the actuation is switched off again.
  • the lighting device after a predetermined lighting duration after completion of the operation is turned off.
  • the lighting duration can advantageously between 1 and 30 seconds, preferably be between 5 and 15 seconds.
  • a feature may be that the lighting device at Opening the door of the cooking compartment is switched on automatically will, even if the lighting device before opening the oven door is switched off. Here too ensures that the cooking space is illuminated when the User fiddled with the door without doing any special To have to press the switch. After closing the The door can, if the Lighting device should be turned off, the lighting device immediately or again with a time delay turned off.
  • a steam cooker according to the invention is especially suitable for devices that have a fan a circulating air or hot air device.
  • a further advantageous feature that depending on the cooking space temperature, especially if the oven temperature is lower than is a predetermined limit, the heating of the hot air device switched off and the fan of the hot air device clocked or with reduced power is operated. If the fan is not constantly or operated with reduced power, can be switched off Lighting device an even lower Cooking space temperature reached and at low operating temperatures the accuracy and uniformity of temperature control be improved.

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

Description

Die Erfindung betrifft eine Vorrichtung zum Zubereiten von Speisen, insbesondere Dampfgargerät, mit einer Backofenmuffel, umfassend eine im jeweiligen Betrieb erforderliche Heizquelle sowie zu der Heizquelle hinzukommende Wärmequellen, wie etwa eine im Garraum angeordnete Beleuchtungseinrichtung zum Beleuchten des Garraums und/oder einen Ventilator für einen Umluft- oder Heißluftbetrieb.The invention relates to a device for preparing food, in particular Steam cooker, with an oven muffle, comprising an im heating source required for each operation as well as to the heating source additional heat sources, such as a lighting device arranged in the cooking space to illuminate the cooking space and / or a fan for circulating air or hot air operation.

Dampfgargeräte sind Einrichtungen, in denen Speisen in heißem Wasserdampf gegart werden. Beim Betrieb des Dampfgargerätes ist dessen Garraum mit Wasserdampf erfüllt, der durch eine Dampferzeugereinheit, die im Garraum oder außerhalb von diesem angeordnet sein kann, erzeugt wird. Gebräuchlich sind auch kombinierte Dampfgargeräte, in denen andere Betriebsphasen, beispielsweise ein Heißluftbetrieb zum Backen oder Braten, möglich sind. Dampfgargeräte sind in der europäischen Patentanmeldung EP 0894460 A1 sowie den darin genannten Druckschriften beschrieben. Andere Varianten von Dampfgargeräten mit einer Dampfgareinrichtung, die ebenfalls zum drucklosen Garen von Speisen vorgesehen sind, bestehen im wesentlichen aus einem Wasserbecken, in dem Wasser erwärmt wird, wobei in das Becken eingebrachte Speisen entweder durch das Wasser oder den Dampf gegart werden. Solche Dampfgargeräte sind beispielsweise in der deutschen Patentanmeldung DE 19726677 A1 beschrieben.Steamers are facilities where food is in hot steam can be cooked. When operating the steam cooker the cooking chamber is filled with steam, by a steam generator unit that is in the cooking space or can be arranged outside of this is generated. Combined steam cookers are also common, in which other operating phases, for example a hot air operation for baking or roasting. steam cookers are in the European patent application EP 0894460 A1 and the publications mentioned therein described. Other variants of steam cookers with a steam cooker, also for cooking food without pressure are essentially made up of a Pool in which water is heated, being in the Basin-fed dishes either through the water or the steam is cooked. Such steamers are for example in the German patent application DE 19726677 A1.

Backöfen sind Öfen, in denen Speisen in einem Garraum gegart werden. Der Garraum ist von einer Backofenmuffel, in die die zu garenden Speisen eingebracht werden können, umschlossen und weist eine Tür zum Öffnen und Schließen des Garraums auf. In allgemein als Backofen bezeichneten Geräten können verschiedene Gartechniken einzeln oder in Kombination angewendet werden. Hierzu zählen beispielsweise die Ober- und/oder Unterhitze, eine Grilleinrichtung, ein Heißluftbetrieb, eine Mikrowelle oder das Dampfgaren. Im letzten Fall nennt man den Ofen einen . Dampfbackofen.Ovens are ovens in which food is cooked in a cooking space become. The cooking space is of an oven muffle, in which the food to be cooked can be brought in, enclosed and has a door to open and close the cooking compartment. In commonly referred to as an oven Devices can use different cooking techniques individually or in Combination can be applied. These include, for example the top and / or bottom heat, a grill device, a hot air operation, a microwave or that Steam cooking. In the latter case, the oven is called one. Steam oven.

Damit der Benutzer des Dampfgargerätes die in den Garraum eingelegten Speisen sowie den Fortgang des Zubereitungsprozesses beobachten kann, ist zumeist im Garraum eine Beleuchtungseinrichtung zum Beleuchten des Garraums angeordnet, wie sie auch bei anderen Backöfen, die keine Dampfgareinrichtung aufweisen, bekannt ist.So that the user of the steam cooker enters the cooking space inlaid dishes and the progress of the preparation process can usually be seen in the cooking space Arranged lighting device for illuminating the cooking space, as with other ovens that don't Have steaming device is known.

Nach dem Stand der Technik wird die Beleuchtungseinrichtung bei Dampfbackofen und anderen Backöfen gleichzeitig mit der für den Garvorgang vorgesehenen Heizquelle eingeschaltet und zusammen mit dieser wieder ausgeschaltet. Die Beleuchtungseinrichtung ist somit immer dann in Betrieb, wenn auch der Backofen zum Zubereiten einer Speise verwendet und hierzu mit Energie versorgt wird, und wird zusammen mit der Heizung bzw. der jeweils benutzten Garvorrichtung ausgeschaltet.According to the prior art, the lighting device for steam ovens and other ovens at the same time switched on with the heating source provided for the cooking process and switched off together with this. The lighting device is therefore always in operation albeit the oven to prepare a dish used and supplied with energy for this, and will together with the heating or the cooking device used switched off.

Üblicherweise werden für die Beleuchtung von Garräumen von Backöfen Glühlampen als Beleuchtungseinrichtungen verwendet. Die Energieaufnahme dieser Lampen liegt typischerweise im Bereich zwischen 5 und 80 W. Bei hochwertigen Öfen können auch mehrere, an unterschiedlichen Orten angeordnete Glühlampen verwendet werden, wodurch einerseits die Beleuchtung auch beim Ausfall einer Glühlampe gesichert und andererseits eine gleichmäßigere und mit weniger Abschattungen versehene Ausleuchtung des Garraums erzielt wird.Usually used for the lighting of cooking rooms of ovens incandescent lamps as lighting devices used. The energy consumption of these lamps is typically in the range between 5 and 80 W. With high quality Ovens can also be several, in different places Arranged incandescent lamps are used, which on the one hand the lighting even if a light bulb fails secured and on the other hand a more even and with less shadowing illumination of the cooking space is achieved.

Zur Erzielung einer möglichst hohen Energieausnutzung und zur Vermeidung einer allzu großen Erwärmung der unmittelbaren Umgebung des Backofens oder des Raumes, in dem er aufgestellt ist, sind Backöfen in der Regel mit einer guten Wärmeisolierung ausgestattet.To achieve the highest possible energy utilization and to avoid excessive heating of the immediate Environment of the oven or the room in which it ovens are usually set up with a good one Equipped with thermal insulation.

Für manche Zubereitungsvorgänge in einem Dampfgargerät oder einem Backofen, wie z.B. Gären von Hefeteig, die Zubereitung von Joghurt oder dem schonenden Auftauen von Gefriergut, ist es jedoch nicht erforderlich, das Gerät auf eine hohe Temperatur aufzuheizen; dies wäre in den genannten Fällen sogar schädlich für die in den Garraum eingelegten Speisen. Es ist jedoch nicht nur erforderlich, die Temperatur gering zu halten, sondern darüber hinaus sollte in vielen Anwendungsfällen, insbesondere bei der Zubereitung von Joghurt unter Verwendung von Zellkulturen, die niedrige Temperatur auch sehr genau konstant gehalten werden. Hierdurch werden hohe Anforderungen an die Qualität der Temperaturregelung gestellt. For some preparation processes in a steam cooker or an oven, e.g. Fermenting yeast dough, the preparation of yoghurt or the gentle thawing of Frozen food, however, it is not necessary to use the device heat up to a high temperature; this would be in the mentioned cases even harmful to those in the cooking space pickled food. However, it is not only necessary to keep the temperature low, but above it addition, in many use cases, in particular when preparing yogurt using Cell cultures, the low temperature also very accurate be kept constant. This makes high demands to the quality of the temperature control.

Im Rahmen der Erfindung wurde gefunden, daß die Abwärme der Beleuchtungseinrichtung beim Betrieb eines Dampfgargerätes, insbesondere in einem niedrigen Temperaturbereich, erheblich zur Erwärmung des Garraums beiträgt und hierdurch bedingt eine genaue Regelung der Temperatur erschwert.In the context of the invention it was found that the waste heat the lighting device when operating a steam cooker, especially in a low temperature range, contributes significantly to the heating of the cooking space and this makes precise regulation of the temperature difficult.

Im Rahmen der Erfindung wurde ferner gefunden, daß Geräte, die eine Umluft- oder Heißlufteinrichtung aufweisen, insbesondere wenn sie auch eine Beleuchtungseinrichtung für den Garraum umfassen, in Umluft- bzw. Heißluftbetrieb niedrige Temperaturen meist nicht dauerhaft einhalten können bzw., auch bei höheren Temperaturen, die genaue Temperaturregelung mit kleinen Temperaturschwankungen erschwert ist.In the context of the invention it was also found that devices which have a circulating air or hot air device, especially if they are also a lighting device for the cooking space, in circulating air or hot air mode usually do not maintain low temperatures permanently can or, even at higher temperatures, the exact Temperature control with small temperature fluctuations difficult is.

Der Erfindung liegt unter Berücksichtigung dieses Standes der Technik die Aufgabe zugrunde, eine Vorrichtung zum Zubereiten von Speisen zu schaffen, die bei niedrigen Temperaturen betrieben und dessen Temperatur, insbesondere bei niedrigen Temperaturen, genauer geregelt werden kann.The present invention takes this state into account the technology is based on the object of a device for preparing food create that operated at low temperatures and its temperature, especially at low temperatures, can be regulated more precisely.

Zur Lösung dieser Aufgabe weist die Vorrichtung eine Regelungseinrichtung auf, mittels der die Wärmequelle beim Betrieb der Vorrichtung in Abhängigkeit von der Garraumtemperatur regelbar ist. To achieve this object, the device has a control device by means of which the heat source during operation of the Device depending on the cooking space temperature is adjustable.

Im Rahmen der Erfindung wurde erkannt, daß der Wärmeverlust eines isolierten Garraums so gering ist, daß die Abwärme der Beleuchtungseinrichtung bei niedrigen Betriebstemperaturen maßgeblich zur Erwärmung beiträgt und daher den Betrieb bei sehr niedrigen Temperaturen verhindert oder die Regelgenauigkeit beeinträchtigt. Messungen haben ergeben, daß der Wärmeverlust ca. 4 W/K beträgt. Bei einer Beleuchtungseinrichtung mit 60 W ergibt sich daraus eine Temperaturerhöhung um 15 K, so daß sich bei Raumtemperatur von 25 °C eine Garraumtemperatur von 40 °C einstellt. Ein Betrieb bei 30 °C ist somit nicht möglich, und ein Betrieb bei Temperaturen, die nahe über 40 °C liegen, weist große Temperaturschwankungen aufgrund von Regelzeitkonstanten und Relaxationseffekten auf.In the context of the invention it was recognized that the heat loss an insulated cooking space is so low that the waste heat the lighting device at low operating temperatures contributes significantly to warming and therefore prevents operation at very low temperatures or affects the control accuracy. Have measurements show that the heat loss is approx. 4 W / K. At a Lighting device with 60 W results from this a temperature increase of 15 K, so that at room temperature of 25 ° C sets a cooking space temperature of 40 ° C. Operation at 30 ° C is therefore not possible and operation at temperatures close to over 40 ° C have large temperature fluctuations due to Control time constants and relaxation effects.

Im Rahmen der Erfindung wurde ferner gefunden, daß der Ventilator der Umluft- bzw. Heißlufteinrichtung zu der Erwärmung des Garraums beiträgt, auch wenn die Heißluftbeheizung ausgeschaltet ist. Die Erwärmung beruht nach im Rahmen der Erfindung gefundenen Erkenntnissen nicht vornehmlich auf der Verlustwärme des Elektromotors, mit dem der Ventilator angetrieben wird, sondern auf der mechanischen Leistungsabgabe der Motorwelle. Diese liegt typischerweise im Bereich von 25 W und wird im Garraum über die Ventilatorflügel in Luftbewegungen umgesetzt.Within the scope of the invention it was also found that the Fan of the circulating air or hot air device to the Heating of the cooking space helps, even if the hot air heating is switched off. The warming is based on im Findings found within the scope of the invention are not primarily on the heat loss of the electric motor with which the fan is driven but on the mechanical one Power output of the motor shaft. This is typically in the range of 25 W and is over in the cooking space the fan blades are converted into air movements.

Diese Luftbewegung wird durch innere Reibung der Luft sowie durch Reibung des Luftstroms an den Garraumwänden in Wärme umgewandelt und beheizt den Garraum, was eine Erhöhung der Garraumtemperatur und eine Erschwerung der Temperaturregelung zur Folge hat. Kommt eine Beleuchtungseinrichtung mit 60 W hinzu, ergibt sich eine Gesamtheizleistung von 85 W, ohne daß ein Heizkörper aktiviert ist. Bei dem eingangs genannten Wärmeverlust ergibt sich dabei eine Aufheizung um 21 °C, also bei einer Raumtemperatur von 25 °C auf 46 °C. Hierdurch wird der Betrieb bei einer niedrigeren Temperatur verhindert und bei dicht darüber liegenden Temperaturen die genaue Temperaturregelung erschwert und beeinträchtigt.This air movement is caused by internal air friction as well due to friction of the air flow on the cooking space walls in Heat is converted and heats the cooking space, which is an increase the cooking space temperature and an aggravation of the temperature control has the consequence. Comes a lighting device with 60 W added, there is a total heating output of 85 W without a radiator activated. This results in the heat loss mentioned at the beginning heating by 21 ° C, i.e. at room temperature from 25 ° C to 46 ° C. As a result, the operation at a prevents lower temperature and at just above it lying temperatures complicates the exact temperature control and impaired.

Diese Probleme sind nicht gegeben oder reduziert, wenn erfindungsgemäß die Beleuchtungseinrichtung und/oder der Ventilator beim einem Betrieb des Dampfgargerätes, mit geringem Energiezufuhrbedarf für die Gartemperatur automatisch steuerbar ist. Im Rahmen der Erfindung wurde erkannt, daß die Beleuchtungseinrichtung und der Ventilator für manche Betriebsarten eine unerwünschte oder störende Wärmequelle darstellen können, die zu der im jeweiligen Betrieb erforderlichen Heizquelle hinzukommt. Die unerwünschten oder störenden Beeinträchtigungen derartiger, zu der eigentlich erforderlichen Heizquelle hinzukommenden Wärmequellen, die auch andere Quellen als die Beleuchtungseinrichtung und den Ventilator umfassen können, werden erfindungsgemäß eliminiert oder reduziert. Dies kann auch bei anderen Vorrichtungen zum Zubereiten von Speisen als Dampfgargeräten, beispielsweise bei Backöfen ohne Dampfgareinrichtung, vorteilhaft sein.These problems are not given or reduced, though according to the invention, the lighting device and / or the Fan when operating the steam cooker, with low energy supply requirement for the cooking temperature automatically is controllable. Within the scope of the invention it was recognized that the lighting device and the fan an undesirable or disruptive for some operating modes Can represent heat source to that in each Operation required heating source is added. The unwanted or disturbing impairments of such, to the heating source actually required Heat sources that are sources other than the lighting device and can include the fan, are eliminated or reduced according to the invention. This can also be used with other devices for preparing Food as steam cookers, for example in ovens without a steam cooker.

Das automatische Steuern der Beleuchtungseinrichtung und/oder des Ventilators kann auf verschiedene Weisen erfolgen, beispielsweise durch Ausschalten, getaktetes Einund Ausschalten (ggf. mit einem gesteuerten oder geregelten Taktverhältnis) oder durch einen Betrieb mit reduzierter Leistung.The automatic control of the lighting device and / or the fan can be done in different ways, for example by switching off, clocked on and off Switch off (if necessary with a controlled or regulated one Clock ratio) or by operation with reduced Power.

Ein anderes vorteilhaftes Merkmal kann darin bestehen, daß die Beleuchtungseinrichtung und/oder der Ventilator in Abhängigkeit von der Garraumtemperatur, insbesondere in Abhängigkeit von einem vorgegebenen Grenzwert der Garraumtemperatur, automatisch gesteuert wird. Der vorgegebene Grenzwert, in Abhängigkeit von dem die Beleuchtungseinrichtung automatisch gesteuert wird, liegt für praktische Zwecke vorteilhafterweise zwischen 30 °C und 70 °C, vorzugsweise zwischen 50 °C und 65 °C. Die erfindungsgemäße Steuerung kann aber auch bei höheren Garraumtemperaturen von Vorteil sein, um einen Betrieb bei einer genauen bzw. kleine Schwankungen aufweisenden Temperatur zu gewährleisten.Another advantageous feature can be that the lighting device and / or the fan depending on the cooking space temperature, in particular depending on a specified limit of the cooking space temperature, is controlled automatically. The default Limit, depending on which the lighting device is controlled automatically, lies for practical purposes advantageously between 30 ° C and 70 ° C, preferably between 50 ° C and 65 ° C. The invention Control can also be carried out at higher cooking chamber temperatures to be beneficial to an operation at a exact or small fluctuations in temperature to ensure.

Die Erfindung ist insbesondere für Dampfgargeräte von Vorteil, da hierbei auch die Erzeugung und Zuführung des Dampfes eine Wärme- bzw. Heizquelle darstellen kann. Bei Geräten mit einer Dampfgareinrichtung, insbesondere bei Dampfgaröfen, findet die Dampferzeugung an einem Heizkörper statt, auf den Wasser aufgebracht wird. Wenn der Heizkörper nicht oder nur wenig beheizt wird, ist keine Dampferzeugung möglich, so daß keine hohen relativen Luftfeuchtigkeiten in dem Garraum erreicht werden können. Dies betrifft auch Dampfgargeräte mit Dampfgareinrichtung, bei denen die Dampferzeugung in einem externen Wasserbehälter erfolgt, da auch hier die Einleitung von Dampf in den Garraum eine Temperaturerhöhung hervorruft, die zusammen mit der Leistung der Beleuchtungseinrichtung oder dem gegebenenfalls zugeschalteten Ventilator einer Heißlufteinrichtung zu hoch ist. Bei manchen Dampfgargeräten ist die Dampferzeugungseinrichtung im Garraum selbst angeordnet.The invention is particularly for steam cookers from Advantage, since the generation and supply of the Steam can be a heat or heating source. at Appliances with a steam cooking device, especially for Steam ovens, the steam generation takes place on a radiator instead of being applied to the water. If the Radiator is not or only slightly heated is not Steam generation possible, so that no high relative Humidity in the cooking space can be achieved. This also applies to steam cookers with steam cookers, where the steam generation in an external water tank takes place because here too the introduction of Steam in the cooking space causes a rise in temperature, which along with the performance of the lighting device or the optionally switched on fan Hot air device is too high. With some steam cookers is the steam generator in the cooking space self-arranged.

Prinzipbedingt weisen Dampferzeugungseinrichtungen für die Umwandlung des zugeführten Wassers in Dampf eine hohe Oberflächentemperatur auf, vorzugsweise über 100 °C. Die Dampferzeugung kann kontinuierlich oder intermittierend erfolgen. Kommt ein Wärmeeintrag durch die Beleuchtungseinrichtung oder einen Ventilator hinzu, wird durch diese Wärmequellen die Temperatur erhöht und die Regelung erschwert. Eine vorteilhaft Ausführungsform der Erfindung kann darin bestehen, daß die Beleuchtungseinrichtung und/oder der Ventilator im Dampfgarbetrieb ausgeschaltet wird.In principle, steam generating devices have the conversion of the supplied water to steam is high Surface temperature, preferably above 100 ° C. The Steam generation can be continuous or intermittent respectively. There is heat input through the lighting device or adding a fan is done by this Heat sources increases the temperature and makes regulation difficult. An advantageous embodiment of the invention can be that the lighting device and / or the fan is switched off in the steam cooking mode becomes.

Eine erste vorteilhafte Ausführungsform kann sein, daß die Beleuchtungseinrichtung und/oder der Ventilator während des gesamten Betriebs mit geringem Energiezufuhrbedarf für die Gartemperatur ausgeschaltet wird. Eine zweite vorteilhafte Ausführungsform kann sein, daß die Beleuchtungseinrichtung und/oder der Ventilator während des Betriebs mit geringem Energiezufuhrbedarf für die Gartemperatur intervallartig ein- und ausgeschaltet wird. Eine weitere vorteilhafte Ausführungsform kann sein, daß die Beleuchtungseinrichtung und/oder der Ventilator während des Betriebs mit geringem Energiezufuhrbedarf für die Gartemperatur mit reduzierter Leistung betrieben wird.A first advantageous embodiment can be that the lighting device and / or the fan during of the entire operation with a low energy supply requirement for the cooking temperature is switched off. A second advantageous embodiment may be that Lighting device and / or the fan during of operation with low energy requirements for the Cooking temperature is switched on and off at intervals. Another advantageous embodiment may be that the lighting device and / or the fan during of operation with low energy requirements for the cooking temperature is operated with reduced power becomes.

Nach einem anderen vorteilhaften Merkmal kann vorgesehen sein, daß die Beleuchtungseinrichtung und/oder der Ventilator automatisch ausgeschaltet wird, wenn die Ist-Temperatur, d.h. die aktuell gemessene Innentemperatur des Garraums, einen vorgegebenen Grenzwert unterschreitet. Hierdurch wird gewährleistet, daß bei niedrigen Betriebstemperaturen die Beleuchtungseinrichtung bzw. der Ventilator ausgeschaltet ist und nicht zur Erwärmung beiträgt. Nachteilig könnte jedoch sein, daß das Zuschalten der Beleuchtungseinrichtung bzw. des Ventilators beim Überschreiten des Grenzwertes zu einer Verlängerung der Zeitdauer führen kann, die verstreicht, bis das Dampfgargerät wieder eine Solltemperatur unterhalb des Grenzwertes einnimmt. According to another advantageous feature can be provided be that the lighting device and / or the fan is automatically switched off when the actual temperature, i.e. the currently measured inside temperature of the Cooking space, falls below a predetermined limit. This ensures that at low operating temperatures the lighting device or the fan is switched off and does not contribute to warming. However, it could be disadvantageous that the lighting device is switched on or the fan when exceeded the limit for an extension of the period which may elapse until the steamer again reaches a target temperature below the limit.

Aus diesem Grund wird nach einem bevorzugten Merkmal vorgeschlagen, daß die Beleuchtungseinrichtung und/oder der Ventilator beim Einstellen einer Solltemperatur, die kleiner als ein vorgegebener Grenzwert ist, automatisch ausgeschaltet wird. Hierdurch wird bereits beim Einstellen der Betriebstemperatur festgelegt, ob die Beleuchtungseinrichtung bzw. der Ventilator ein- oder ausgeschaltet ist. Bei Geräten, die die Beleuchtungseinrichtung bze. den Ventilator erst dann zuschalten, wenn nach dem Einstellen der Betriebstemperatur die Beheizung eingeschaltet wird, wird in entsprechender Weise die Steuerschaltung derart beeinflußt, daß die Beleuchtungseinrichtung bzw. der Ventilator beim Starten der Beheizung unterhalb des Grenzwertes nicht eingeschaltet wird.For this reason, according to a preferred feature, it is proposed that that the lighting device and / or the Fan when setting a target temperature, the is less than a predetermined limit, automatically is turned off. This will already be when setting the operating temperature determines whether the lighting device or the fan is switched on or off is. For devices that have the lighting device bze. only switch on the fan when heating after setting the operating temperature is switched on, the Control circuit influenced such that the lighting device or the fan when starting the heating below the limit is not switched on.

Dies bedeutet, daß die Beleuchtungseinrichtung bzw. der Ventilator auch bei kaltem Innenraum während des Aufheizvorganges, beispielsweise mit Dampf oder Unterhitze, ausgeschaltet ist, sofern eine Solltemperatur unterhalb des Grenzwertes eingestellt wurde. Dadurch wird dem Benutzer die Systematik beim Bedienen offensichtlich und es erfolgt keine für den Benutzer überraschende und unerwartete Abschaltung der Beleuchtungseinrichtung beim Ende des Aufheizvorgangs.This means that the lighting device or the Fan even when the interior is cold during the heating process, for example with steam or bottom heat if a set temperature is below the Limit was set. This will make the user the systematics when operating and it is done none surprising and unexpected for the user Switch off the lighting device at the end of the heating process.

Nach einem zusätzlichen vorteilhaften Merkmal wird vorgeschlagen, daß die Beleuchtungseinrichtung um eine Verzögerungszeit verzögert nach dem Einstellen der Solltemperatur automatisch ausgeschaltet wird. Die Verzögerungszeit beträgt vorteilhafterweise zwischen 0,1 und 10 Sekunden, vorzugsweise zwischen 1,0 und 3,0 Sekunden. Wenn die Beleuchtungseinrichtung nicht sofort beim Einstellen einer Solltemperatur, sondern erst nach Verstreichen einer Verzögerungszeit ausgeschaltet wird, hat dies den Vorteil, daß während des Einstellens der Solltemperatur, d.h. beim Drehen des Temperaturwahlschalters, keine Abschaltung erfolgt und in dieser Zeit der Garraum noch für das Betrachten durch den Benutzer beleuchtet ist. Erst wenn der Einstellvorgang der Solltemperatur beendet ist, d.h. die vorgewählte Solltemperatur nicht mehr verändert wird, startet die Verzögerungszeitmessung, und nach Ablauf der vorgegebenen Verzögerungszeit wird die Beleuchtungseinrichtung ausgeschaltet.According to an additional advantageous feature, it is proposed that that the lighting device by a delay time delayed after setting the target temperature is switched off automatically. The delay time is advantageously between 0.1 and 10 seconds, preferably between 1.0 and 3.0 seconds. If the lighting device is not immediately adjusted a set temperature, but only after one Delay time is switched off, this has the Advantage that while setting the target temperature, i.e. when turning the temperature selector switch, no switch-off and the cooking compartment is still viewing by the user is illuminated. First when the setting process of the target temperature is finished, i.e. the preselected target temperature no longer changes the delay time measurement starts and after expiry the lighting device becomes the predetermined delay time switched off.

Ein anderes, in allen Ausführungsformen vorteilhaftes Merkmal, kann darin bestehen, daß die Beleuchtungseinrichtung bei der Betätigung eines Bedienelementes des Backofens automatisch eingeschaltet und nach Beendigung der Betätigung wieder ausgeschaltet wird. Auch hierbei kann nach einem zusätzlichen vorteilhaften Merkmal vorgesehen sein, daß die Beleuchtungseinrichtung nach einer vorgegebenen Beleuchtungsdauer nach Beendigung der Betätigung ausgeschaltet wird. Die Beleuchtungsdauer kann vorteilhafterweise zwischen 1 und 30 Sekunden, vorzugsweise zwischen 5 und 15 Sekunden betragen. Somit wird beim Betätigen eines Bedienelementes, z.B. bei Veränderung der Temperaturvorgabe, der Abfrage der Ist-Temperatur, des Wechsels der Beheizungsart oder der Abfrage einer Zeitschaltuhr die Beleuchtungseinrichtung eingeschaltet, damit der Benutzer den Garrauminhalt hierbei betrachten kann, ohne hierzu die Beleuchtungseinrichtung mittels eines speziellen Schalters einschalten zu müssen.Another, advantageous in all embodiments Feature, may be that the lighting device when operating a control element of the Oven automatically switched on and after completion the actuation is switched off again. Here too can be provided according to an additional advantageous feature be that the lighting device after a predetermined lighting duration after completion of the operation is turned off. The lighting duration can advantageously between 1 and 30 seconds, preferably be between 5 and 15 seconds. Thus when operating a control element, e.g. with change the temperature specification, the query of the actual temperature, changing the type of heating or querying one Timer the lighting device is switched on, so that the user can look at the contents of the cooking space can without the lighting device need to switch on using a special switch.

Ein weiteres, in allen Ausführungsformen vorteilhaftes Merkmal kann sein, daß die Beleuchtungseinrichtung beim Öffnen der Tür des Garraums automatisch eingeschaltet wird, auch wenn die Beleuchtungseinrichtung vor dem Öffnen der Backofentür ausgeschaltet ist. Auch hierbei wird gewährleistet, daß der Garraum beleuchtet wird, wenn der Benutzer an der Tür hantiert, ohne hierzu einen besonderen Schalter betätigen zu müssen. Nach dem Schließen der Tür kann, sofern in dem jeweiligen Betriebszustand die Beleuchtungseinrichtung ausgeschaltet sein soll, die Beleuchtungseinrichtung sofort oder wiederum zeitverzögert ausgeschaltet werden.Another advantageous in all embodiments A feature may be that the lighting device at Opening the door of the cooking compartment is switched on automatically will, even if the lighting device before opening the oven door is switched off. Here too ensures that the cooking space is illuminated when the User fiddled with the door without doing any special To have to press the switch. After closing the The door can, if the Lighting device should be turned off, the lighting device immediately or again with a time delay turned off.

Die erfindungsgemäße Ausbildung eines Dampfgargerätes ist insbesondere für Geräte geeignet, die einen Ventilator einer Umluft- oder Heißlufteinrichtung aufweisen. Für diese wird nach einem weiteren vorteilhaften Merkmal vorgeschlagen, daß in Abhängigkeit von der Garraumtemperatur, insbesondere wenn die Garraumtemperatur kleiner als ein vorgegebener Grenzwert ist, die Heizung der Heißlufteinrichtung ausgeschaltet und der Ventilator der Heißlufteinrichtung getaktet oder mit reduzierter Leistung betrieben wird. Wenn der Ventilator nicht ständig oder mit reduzierter Leistung betrieben wird, kann bei ausgeschalteter Beleuchtungseinrichtung eine noch niedrigere Garraumtemperatur erreicht und bei niedrigen Betriebstemperaturen die Genauigkeit und Gleichmäßigkeit der Temperaturregelung verbessert werden.The formation of a steam cooker according to the invention is especially suitable for devices that have a fan a circulating air or hot air device. For this is proposed according to a further advantageous feature, that depending on the cooking space temperature, especially if the oven temperature is lower than is a predetermined limit, the heating of the hot air device switched off and the fan of the hot air device clocked or with reduced power is operated. If the fan is not constantly or operated with reduced power, can be switched off Lighting device an even lower Cooking space temperature reached and at low operating temperatures the accuracy and uniformity of temperature control be improved.

Claims (17)

  1. Device for preparation of foods, particularly a steam cooking appliance, with a baking oven muffle, comprising a heat source required in the respective operation as well as warmth sources supplementary to the heat source, such as, for example, lighting equipment, which is arranged in the cooking chamber, for illumination of the cooking chamber and/or a fan for circulatory air operation or hot air operation, characterised in that the device comprises regulating equipment by means of which the warmth source can be regulated in dependence on the cooking chamber temperature during operation of the device.
  2. Device according to claim 1, characterised in that the lighting equipment and/or the fan during operation of the steam cooking appliance with low energy supply requirement for the cooking temperature can be switched off, cyclically switched on and off or operated with reduced power.
  3. Device according to claim 1 or 2, characterised in that the lighting equipment and/or the fan is or are automatically controllable in dependence on the cooking chamber temperature, particularly in dependence on a preset limit value of the cooking chamber temperature.
  4. Device according to one of the preceding claims, characterised in that the lighting equipment and/or the fan is or are switched off in steam cooking operation.
  5. Device according to one of the preceding claims, characterised in that the lighting equipment and/or the fan is or are switched off during the entire operation with low energy supply requirement for the cooking temperature.
  6. Device according to one of the preceding claims, characterised in that the lighting equipment and/or the fan is or are intermittently switched on and off during operation with low energy supply requirement for the cooking temperature.
  7. Device according to one of the preceding claims, characterised in that the lighting equipment and/or the fan is or are automatically switched off when the actual temperature falls below a preset limit value.
  8. Device according to one of the preceding claims, characterised in that the lighting equipment and/or the fan is or are automatically switched off when setting a target temperature which is lower than a preset limit value.
  9. Device according to one of the preceding claims, characterised in that the limit value is between 30° C and 70° C, preferably between 50° C and 65° C.
  10. Device according to claim 8, characterised in that the lighting equipment is automatically switched off delayed by a delay time after setting of the target temperature.
  11. Device according to claim 10, characterised in that the delay time is between 0.1 and 10 seconds, preferably between 1.0 and 3.0 seconds.
  12. Device according to one of the preceding claims, characterised in that the lighting equipment is automatically switched on when an operating element of the baking oven is actuated and switched off again after conclusion of the actuation.
  13. Device according to claim 12, characterised in that the lighting equipment is switched off after a preset lighting duration after conclusion of the actuation.
  14. Device according to claim 13, characterised in that the lighting duration is between 1 and 30 seconds, preferably between 5 and 15 seconds.
  15. Device according to one of the preceding claims, characterised in that the lighting equipment is automatically switched on when the door of the cooking chamber is opened.
  16. Device according to one of the preceding claims, characterised in that it comprises hot air equipment.
  17. Device according to claim 16, characterised in that the heater of the hot air equipment is switched off and the fan of the hot air equipment is operated cyclically or with reduced power in dependence on the cooking chamber temperature, particularly when the cooking chamber temperature is smaller than a preset limit value.
EP00102144A 1999-02-19 2000-02-07 Device for preparing food, in particular baking oven for steam cooking Expired - Lifetime EP1036990B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19906990A DE19906990A1 (en) 1999-02-19 1999-02-19 Steam-cooking apparatus, especially steam-baking oven with baking oven muffle has control device by means of which lighting device and/or fan can be controlled automatically for operation with minimal energy supply
DE19906990 1999-02-19

Publications (3)

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EP1036990A2 EP1036990A2 (en) 2000-09-20
EP1036990A3 EP1036990A3 (en) 2000-09-27
EP1036990B1 true EP1036990B1 (en) 2004-09-01

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EP (1) EP1036990B1 (en)
DE (2) DE19906990A1 (en)
ES (1) ES2226621T3 (en)

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DE19906990A1 (en) 2000-08-24
EP1036990A3 (en) 2000-09-27
DE50007580D1 (en) 2004-10-07
EP1036990A2 (en) 2000-09-20
ES2226621T3 (en) 2005-04-01

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