EP2151631B1 - Cooking oven - Google Patents
Cooking oven Download PDFInfo
- Publication number
- EP2151631B1 EP2151631B1 EP09165398.0A EP09165398A EP2151631B1 EP 2151631 B1 EP2151631 B1 EP 2151631B1 EP 09165398 A EP09165398 A EP 09165398A EP 2151631 B1 EP2151631 B1 EP 2151631B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching element
- temperature
- oven
- cooling air
- air blower
- 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.)
- Active
Links
- 238000010411 cooking Methods 0.000 title claims description 13
- 238000001816 cooling Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 24
- 230000001419 dependent effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
Definitions
- the DE 91 15 013 U1 discloses a circuit arrangement for cooling fan control for a household appliance.
- the present invention is based on the object, an oven with a temperature protection system and a cooperating cooling air system in such a way that the prescribed temperature limits can be safely met with special consideration not only the control but also the monitoring of the cooling air system with respect to its functionality.
- an oven is proposed with a thermal heating cooking chamber and with an adjacent switch room for controlling the oven operation serving highly thermally stressed or heat-sensitive power components, arranged with at least one switch room, the discharge of heated air from the switch room serving Cooling air fan and with a temperature-dependent switching element with directly associated self-heating, the self-heated switching element or its temperature sensor is disposed in the flow region of the cooling air blower and at a predetermined difference between the temperature acting on the switching element due to the self-heating and the prevailing temperature in the flow region shutdown at least the thermal Heating elements, the power components or the furnace operation causes.
- the temperature-dependent switching element is heated by the self-heating in the direction of the shutdown, but by the in particular incoming or outgoing air flow of the cooling air blower is cooled and prevented from reaching the critical shutdown temperature. This means that in case of failure of the cooling air blower, z. B.
- the cooling of the self-heated switching element fails and is brought in a short time this switching element due to the coming from the activated heating and / or from the cooking chamber or thermally highly stressed components heat to the critical shutdown temperature, where ideally the whole Oven operation interrupted d. H. the oven is switched off.
- the temperature difference between the flow temperature of the cooling air blower and the effect caused by self-heating on the temperature-dependent switching element "internal" temperature for the Abschalte- or opening function of the switching element can be determined by appropriate determination of the shutdown temperature on the switching element, however, it is advantageous if the switching element or its Temperature sensor is arranged on the suction side of the cooling air blower connected to the fresh air, which acts on the switching element a more cooling air flow than in the arrangement of the switching element in the area of the cooling air blower outgoing more or less heated exhaust air.
- the heating element is assigned to the switching element in the self-heating.
- the figure shows the upper part of a baking oven and that part of the oven, which is above a cooking chamber 1 with a thermal heating element in the form of a grill element 2 (see section) and a likewise enclosed by the oven housing 3 switch room 4 forms, from the cooking chamber 1 through a bottom plate 5 is separated.
- the front and the front side of the oven is marked with 6 and the back with 7.
- Placed in the switch room 4 are electrical and electronic components, generally and for example marked with 8, which serve to control and regulation of the oven and are partly thermally highly stressed and heat-sensitive power components.
- switching element 11 is used to monitor the function of the cooling air blower 9.
- switching element 11 and self-heating 12 are in the functional circuit z. B. a main switch of the oven, wherein the switching contact of the switching element 11 is formed as a so-called "opener", which is closed during normal furnace operation and at Reaching an increased critical temperature opens and thus shuts off the furnace operation.
- the self-heating 12 is also heated, the thermostatic switching element 11 being kept at a low temperature level by the cool suction flow 14.
- the switching element 11 or the combination switching element / self-heating is no longer cooled and the temperature at the switching element 11 increases rapidly due to the heat of the self-heating 12 and / or due to the heat coming from the cooking chamber 1 , And the switching contact of the switching element 11 opens due to the now changed difference between the greatly increased temperature at the switching element 11 and the upward-limiting temperature in the switch room 1. For example, in regular furnace operation said difference is negative, d. H.
- the temperature at the self-heated switching element 11 is lower than the temperature in the switch room compared to the temperature in the environment, while after failure of the cooling air blower 9, a reversal to avoid positive difference with higher temperature on self-heating switching element, which leads to a short-term shutdown of the disturbed Operating system z. B. leads the entire oven and thus avoids very quickly destruction of the heat-sensitive components and impairment of the entire oven function.
- Shutdown in the event of a fault also serves to maintain temperature limit compliance for the materials used in the switch front, e.g. at a plastic panel.
Landscapes
- 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)
Description
Bei bekannten Backöfen zur Garbehandlung von Lebensmitteln ist es üblich, die elektrischen oder elektronischen Bauelemente in einem Schalterraum oberhalb des Garraumes unterzubringen und diesen Raum z. B. mit einem sogenannten Querstromgebläse zu kühlen, d. h. die Betriebswärme abzuführen bevor in diesem Schalterraum eine erhöhte, kritische Raumtemperatur erreicht wird. In dem vorgenannten Garraum wird bei Betrieb mit thermischen Heizelementen eine starke Wärmeentwicklung stattfinden insbesondere dann, wenn der Backofen auch mit einer Einrichtung für den sogenannten pyrolytischen Selbstreinigungsbetrieb ausgerüstet ist, bei welchem Selbstreinigungsbetrieb etwa 500 °C anfallen. Während dem Backofenbetrieb und auch nach Beendigung desselben findet durch Wärmeleitung noch ein beträchtlicher Transport von Wärmeenergie innerhalb des Backofengehäuses bis zum vorerwähnten Schalterraum statt, so dass auch nach Beendigung eines Hochtemperatur-Betriebs zum Schutz der in diesem Raum angeordneten Bauteile eine erzwungene Kühlung stattfinden muss.In known ovens for cooking treatment of food, it is common to accommodate the electrical or electronic components in a switch room above the cooking chamber and z. B. with a so-called cross-flow fan to cool, d. H. dissipate the operating heat before an increased, critical room temperature is reached in this switch room. In the aforementioned cooking space, a strong heat development will take place when operating with thermal heating elements, especially when the oven is also equipped with a device for the so-called pyrolytic self-cleaning operation, in which self-cleaning operation about 500 ° C incurred. During the oven operation and also after completion of the same takes place by heat conduction still a considerable transport of heat energy within the oven housing to the aforementioned switch room, so that even after completion of a high-temperature operation to protect the arranged in this room components forced cooling must take place.
Zur bedarfsgemäßen Abführung der ein vorbestimmtes Temperaturniveau übersteigenden erhitzten Luft aus dem Schalterraum sind Systeme bekannt, bei denen das im Schalterraum platzierte Kühlluftgebläse durch einen Temperaturschutzschalter gesteuert, d. h. in Abhängigkeit von der im Schalterraum herrschenden Temperatur eingeschaltet und ausgeschaltet wird.For the demand-related removal of a predetermined temperature level exceeding heated air from the switch room systems are known in which the placed in the switch room cooling air blower controlled by a temperature protection switch, d. H. is turned on and off depending on the prevailing temperature in the switch room.
Die
Die
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, einen Backofen mit einem Temperaturschutzsystem und einem damit kooperierenden Kühlluftsystem so auszugestalten, dass die vorgeschriebenen Temperaturgrenzwerte sicher eingehalten werden können unter besonderer Berücksichtigung nicht nur der Ansteuerung sondern auch der Überwachung des Kühlluftsystems bezüglich dessen Funktionstauglichkeit.The present invention is based on the object, an oven with a temperature protection system and a cooperating cooling air system in such a way that the prescribed temperature limits can be safely met with special consideration not only the control but also the monitoring of the cooling air system with respect to its functionality.
Diese Aufgabe wird gemäß der Erfindung gelöst mit einem Backofen nach Anspruch 1. Insbesondere wird ein Backofen vorgeschlagen mit einem thermische Heizelemente aufweisenden Garraum und mit einem angrenzenden Schalterraum für der Steuerung des Backofenbetriebs dienende thermisch hochbelastete bzw. wärmeempfindliche Leistungsbauteile, mit mindestens einem im Schalterraum angeordneten, der Abführung der erhitzten Luft aus dem Schalterraum dienenden Kühlluftgebläse und mit einem temperaturabhängigen Schaltelement mit unmittelbar zugeordneter Eigenheizung, wobei das eigenbeheizte Schaltelement bzw. dessen Temperaturfühler im Strömungsbereich des Kühlluftgebläses angeordnet ist und bei einer vorbestimmten Differenz zwischen der am Schaltelement wirkenden Temperatur infolge der Eigenheizung und der im Strömungsbereich herrschenden Temperatur eine Abschaltung zumindest der thermischen Heizelemente, der Leistungsbauteile bzw. des Ofenbetriebs bewirkt.This object is achieved according to the invention with an oven according to claim 1. In particular, an oven is proposed with a thermal heating cooking chamber and with an adjacent switch room for controlling the oven operation serving highly thermally stressed or heat-sensitive power components, arranged with at least one switch room, the discharge of heated air from the switch room serving Cooling air fan and with a temperature-dependent switching element with directly associated self-heating, the self-heated switching element or its temperature sensor is disposed in the flow region of the cooling air blower and at a predetermined difference between the temperature acting on the switching element due to the self-heating and the prevailing temperature in the flow region shutdown at least the thermal Heating elements, the power components or the furnace operation causes.
Erfindungsgemäß wird einerseits durch die Zuordnung einer Eigenheizung zu dem Schaltelement und andererseits durch die Platzierung dieses Schaltelements bzw. dessen Temperaturfühler in der Luftströmung des Kühlluftgebläses eine Überwachung des Kühlluftsystems erreicht, indem das temperaturabhängige Schaltelement durch die Eigenheizung in Richtung der Abschalttemperatur erhitzt wird, jedoch durch die insbesondere ankommende oder abgehende Luftströmung des Kühlluftgebläses gekühlt und am Erreichen der kritischen Abschalttemperatur gehindert wird. Dies bedeutet, dass bei Ausfall des Kühlluftgebläses, z. B. bei Blockierung der Motorlager, die Kühlung des eigenbeheizten Schaltelements ausfällt und in kurzer Zeit dieses Schaltelement infolge der von der aktivierten Eigenheizung und/oder von der vom Garraum oder von thermisch hochbelasteten Bauteilen herkommenden Hitze auf die kritische Abschalttemperatur gebracht wird, wo idealerweise der gesamte Ofenbetrieb unterbrochen d. h. der Backofen abgeschalten wird.According to the invention, on the one hand by the assignment of a self-heating to the switching element and on the other hand by the placement of this switching element or its temperature sensor in the air flow of the cooling air blower monitoring of the cooling air system is achieved by the temperature-dependent switching element is heated by the self-heating in the direction of the shutdown, but by the in particular incoming or outgoing air flow of the cooling air blower is cooled and prevented from reaching the critical shutdown temperature. This means that in case of failure of the cooling air blower, z. B. in blocking the engine mounts, the cooling of the self-heated switching element fails and is brought in a short time this switching element due to the coming from the activated heating and / or from the cooking chamber or thermally highly stressed components heat to the critical shutdown temperature, where ideally the whole Oven operation interrupted d. H. the oven is switched off.
Die Temperaturdifferenz zwischen der Strömungstemperatur des Kühlluftgebläses und der infolge Eigenheizung am temperaturabhängigen Schaltelement bewirkten "inneren" Temperatur für die Abschalte- bzw. Öffnungsfunktion des Schaltelements kann durch geeignete Festlegung der Abschaltetemperatur am Schaltelement bestimmt werden, jedoch ist es vorteilhaft, wenn das Schaltelement bzw. dessen Temperaturfühler an der Saugseite des an die Frischluft angeschlossenen Kühlluftgebläses angeordnet ist, womit auf das Schaltelement eine stärker kühlende Luftströmung einwirkt als bei Anordnung des Schaltelements im Bereich der vom Kühlluftgebläse abgehenden mehr oder weniger erhitzten Abluft.The temperature difference between the flow temperature of the cooling air blower and the effect caused by self-heating on the temperature-dependent switching element "internal" temperature for the Abschalte- or opening function of the switching element can be determined by appropriate determination of the shutdown temperature on the switching element, however, it is advantageous if the switching element or its Temperature sensor is arranged on the suction side of the cooling air blower connected to the fresh air, which acts on the switching element a more cooling air flow than in the arrangement of the switching element in the area of the cooling air blower outgoing more or less heated exhaust air.
Zu Gunsten einer unmittelbaren und verzögerungsfreien Übermittlung der Temperatur der Eigenheizung zum Schaltelement ist es vorteilhaft, wenn dem Schaltelement in wärmeleitender Verbindung die Eigenheizung zugeordnet ist.In favor of an immediate and delay-free transmission of the temperature of the self-heating to the switching element, it is advantageous if the heating element is assigned to the switching element in the self-heating.
Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispieles nachstehend erläutert.The invention is explained below with reference to an embodiment shown in the drawing.
Die Figur zeigt den oberen Teil eines Backofens und zwar den Teil des Backofens, der oberhalb eines Garraumes 1 mit einem thermischen Heizelement in Form eines Grillheizkörpers 2 liegt (siehe Ausschnitt) und einen ebenfalls vom Ofengehäuse 3 umschlossenen Schalterraum 4 bildet, der vom Garraum 1 durch eine Bodenplatte 5 getrennt ist. Die Bedien- und Frontseite des Backofens ist mit 6 und die Rückseite mit 7 gekennzeichnet. Im Schalterraum 4 platziert sind elektrische und elektronische Bauelemente, allgemein und beispielsweise mit 8 gekennzeichnet, die der Steuerung und Regelung des Backofens dienen und zum Teil thermisch hochbelastete und wärmeempfindliche Leistungsbauteile sind.The figure shows the upper part of a baking oven and that part of the oven, which is above a cooking chamber 1 with a thermal heating element in the form of a grill element 2 (see section) and a likewise enclosed by the
Im Schalterraum 4 ist ein als Querstromgebläse ausgebildetes Kühlluftgebläse 9 mit Elektromotor 9' angeordnet, dessen Saugseite der Ofenrückseite 7 und dessen Druck-oder Ausblasseite der Ofenfrontseite 6 zugewandt ist. Hinter der Saugseite des Kühlluftgebläses 9 und unmittelbar vor dem rückseitigen, mit Lüftungsöffnungen 10 versehenen Teil des Ofengehäuses 3 (der Übersichtlichkeit halber gemäß Pfeil in Explosionsdarstellung gezeigt) ist platziert ein temperaturabhängiges Schaltelement 11 in unmittelbarer Nähe seiner Eigenheizung 12 in Form eines elektrischen Widerstandes. Schaltelement 11 und Eigenheizung 12 sind auf einem metallischen Träger 13 befestigt und stehen damit über diese gut wärmeleitende Brücke in direkter Wärmekopplung. Wie durch Frischluftpfeile 14 verdeutlicht liegt damit das Schaltelement 11 direkt im Frischluft-Ansaugbereich des Kühlluftgebläses 9.In the switch room 4 designed as a cross-flow fan cooling air blower 9 is arranged with electric motor 9 ', the suction side of the furnace rear side 7 and the pressure or Ausblasseite the furnace front side 6 faces. Behind the suction side of the cooling air blower 9 and immediately in front of the rear, provided with
Beim Ausführungsbeispiel dient das als Temperaturschutzschalter dienende Schaltelement 11 der Überwachung der Funktion des Kühlluftgebläses 9. Schaltelement 11 und Eigenheizung 12 liegen im Funktionsstromkreis z. B. eines Hauptschalter des Backofens, wobei der Schaltkontakt des Schaltelements 11 als sogenannter "Öffner" ausgebildet ist, der während des normalen Ofenbetriebs geschlossen ist und bei Erreichen einer erhöhten kritischen Temperatur öffnet und damit den Ofenbetrieb abschaltet. Sobald das Kühlluftgebläse 9 läuft wird auch die Eigenheizung 12 geheizt, wobei das thermostatische Schaltelement 11 durch die kühle Saugströmung 14 auf einem niedrigen Temperaturniveau gehalten wird.In the exemplary embodiment serving as a temperature protection switch switching element 11 is used to monitor the function of the cooling air blower 9. switching element 11 and self-
Reißt die Saugströmung 14 infolge Ausfall des Kühlluftgebläses 9 ab so wird das Schaltelement 11 bzw. die Kombination Schaltelement/Eigenheizung nicht mehr gekühlt und die Temperatur am Schaltelement 11 steigt schnell an durch die Hitze der Eigenheizung 12 und/oder durch die vom Garraum 1 herkommende Hitze, und der Schaltkontakt des Schaltelements 11 öffnet infolge der nunmehr geänderten Differenz zwischen der stark erhöhten Temperatur am Schaltelement 11 und der nach oben hin zu begrenzenden Temperatur im Schalterraum 1. Beispielsweise ist bei regulärem Ofenbetrieb die genannte Differenz negativ, d. h. die Temperatur am eigenbeheizten Schaltelement 11 ist im Vergleich mit der Temperatur in dessen Umgebung niedriger als die Temperatur im Schalterraum, während nach Ausfall des Kühlluftgebläses 9 eine Umkehrung zu einer vermeidenden positiven Differenz mit höherer Temperatur am eigenbeheizten Schaltelement erfolgt, die zu einer kurzfristigen Abschaltung des gestörten Betriebssystems z. B. des gesamten Backofens führt und damit sehr schnell eine Zerstörung der wärmeempfindlichen Bauelemente und ein Beeinträchtigung der gesamten Backofenfunktion vermeidet.If the
Die Abschaltung im Fehlerfall dient ebenfalls der Temperatur-Grenzwert-Einhaltung für die verwendeten Materialien in der Schalterfront, z.B. bei einer Kunststoffblende.Shutdown in the event of a fault also serves to maintain temperature limit compliance for the materials used in the switch front, e.g. at a plastic panel.
Claims (2)
- Cooking oven with at least one cooking chamber (1) having a thermal heating element (2), with an adjoining switch area (4) for thermally highly-stressed or heat-sensitive power components (8) used for controlling operation of the cooking oven, with at least one cooling air blower (9) disposed in the switch area (4) used for taking the heated air out of the switch area (4) and with a temperature-dependent switching element (11), characterised in that the switching element (11) has its own directly assigned heater (12), wherein the self-heated switching element (11) or its temperature sensor is disposed in the flow area of the cooling air blower (9) and at a pre-specified critical difference between the temperature acting on the switching element (11) as a result of its own heater (12) and the temperature obtaining in the switch area (4), switching off the at least one thermal heating element (2), the power components or oven operation has the effect that, on failure of the cooling air blower (9) the cooling of the self-heated switching element no longer takes place and said element is brought from active self heating to the critical switch-off temperature, where ideally the operation of the oven as a whole is interrupted, wherein the switching element (11) or its temperature sensor are arranged on the suction side of the cooling air blower (9) connected to the fresh air (14), wherein the own heater (12) is assigned to the switching element (11) in a heat-conducting connection and wherein the switching element (11) and the own heater (12) are attached to a metallic carrier (13).
- Cooking oven according to one of the preceding claims, characterised in that the switching element (11) has a switching contact that opens at a critical, increased temperature and thus switches off the thermal heating elements, the power components or the operation of the oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL09165398T PL2151631T3 (en) | 2008-07-17 | 2009-07-14 | Cooking oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008033534A DE102008033534A1 (en) | 2008-07-17 | 2008-07-17 | oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2151631A1 EP2151631A1 (en) | 2010-02-10 |
| EP2151631B1 true EP2151631B1 (en) | 2015-01-07 |
Family
ID=41268151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09165398.0A Active EP2151631B1 (en) | 2008-07-17 | 2009-07-14 | Cooking oven |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2151631B1 (en) |
| DE (1) | DE102008033534A1 (en) |
| ES (1) | ES2528126T3 (en) |
| PL (1) | PL2151631T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2913590A1 (en) * | 2014-02-28 | 2015-09-02 | Miele & Cie. KG | Cooking device and operation method |
| KR20220001851A (en) * | 2020-06-30 | 2022-01-06 | 엘지전자 주식회사 | Cooking appliance and method for controlling thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2947151C2 (en) * | 1979-11-22 | 1989-01-12 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | oven |
| DE3910585A1 (en) * | 1989-04-01 | 1990-10-04 | Buderus Kuechentechnik | Circuit arrangement for a cooking device |
| DE9115013U1 (en) * | 1991-12-03 | 1992-02-06 | Bosch-Siemens Hausgeräte GmbH, 8000 München | Circuit arrangement for cooling fan control for a household appliance |
| US5918589A (en) | 1996-05-10 | 1999-07-06 | Whirlpool Corporation | Low moisture/closed door broil oven ventilation system |
| DE102005044646B4 (en) * | 2005-09-19 | 2017-10-12 | BSH Hausgeräte GmbH | Cooking appliance |
| DE102006005293A1 (en) * | 2006-02-06 | 2007-08-09 | BSH Bosch und Siemens Hausgeräte GmbH | oven |
-
2008
- 2008-07-17 DE DE102008033534A patent/DE102008033534A1/en not_active Withdrawn
-
2009
- 2009-07-14 ES ES09165398.0T patent/ES2528126T3/en active Active
- 2009-07-14 EP EP09165398.0A patent/EP2151631B1/en active Active
- 2009-07-14 PL PL09165398T patent/PL2151631T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES2528126T3 (en) | 2015-02-04 |
| EP2151631A1 (en) | 2010-02-10 |
| DE102008033534A1 (en) | 2010-01-21 |
| PL2151631T3 (en) | 2015-05-29 |
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