DE3028262C1

DE3028262C1 - Cooking device, especially stove

Info

Publication number: DE3028262C1
Application number: DE19803028262
Authority: DE
Inventors: Josef 8221 Palling Gerl; Herbert Nachlinger; Karl 8225 Traunreut Nitzinger
Original assignee: Bosch Siemens Hausgerate GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 1980-07-25
Filing date: 1980-07-25
Publication date: 1982-07-22

Description

Zwischen dem Backrohr 1 und der Kochmulde 5 befindet sich ein Schalterraum 8, der zur Herdfrontseite durch ein Schaltertableau 9 begrenzt ist. Hinter dem Schaltertableau 9 befestigt ist eine nur durch sein Gehäuse verdeutlichte elektronische Einrichtung in Form einer Elektronikuhr 10, deren elektrisches Anschlußelement mit b bezeichnet ist. Unmittelbar oberhalb der oberen Backrohrbegrenzung befindet sich ein Kühlluftkanal 11, an den im Herdinneren ein zum Schalterraum 8 gerichtetes Kühlluftgebläse angrenzt und der an der Herdfrontseite ins Freie mündet. Das Kühlluftgebläse 12 ist durch einen nicht weiter dargestellten Elektromotor angetrieben, dessen elektrische Anschlußelemente in der Figur nicht dargestellt sind. Das Kühlluftgebläse wird beispielsweise in Gang gesetzt beim Betrieb des Backrohres 1 mit höherer Betriebstemperatur wie z. B. während einem pyrolytischen Selbstreinigungsvorgong, bei dem im Inneren des Backrohres 1 eine Temperatur von ca. 500"C herrscht.A switch room is located between the oven 1 and the hob 5 8, which is limited to the front of the stove by a switch panel 9. Behind the switch panel 9 is an electronic device illustrated only by its housing in the form of an electronic watch 10, the electrical connection element of which is denoted by b is. A cooling air duct is located directly above the upper edge of the oven 11, which is adjoined in the interior of the stove by a cooling air fan directed towards the switch room 8 and which flows into the open on the front of the stove. The cooling air fan 12 is through driven an electric motor, not shown, whose electrical connection elements are not shown in the figure. The cooling air fan is for example in Gear set when operating the oven 1 with a higher operating temperature such. B. during a pyrolytic Self-cleaning prong with which a temperature of approx. 500 "C prevails inside the oven 1.

Hierbei saugt das Kühlluftgebläse 12 die erhitzte Luft aus dem Schalterraum 8 ab und befördert sie in Pfeilrichtung nach außen. Mit 13 ist ein temperaturabhängiger Schalter oder- kegler bezeichnet dessen elektrische Anschlußelemente mit c 1 und c 2 bezeichnet sind. Dieser Schalter 13 ist unmittelbar an dem die Elektronikuhr 10 umgebenden Gehäuse 14 befestigt und zwar in einer solchen Stellung, daß der Schalter bzw.Here, the cooling air fan 12 sucks the heated air out of the switch room 8 and transports it outwards in the direction of the arrow. At 13 is a temperature dependent Switch or kegler denotes its electrical connection elements with c 1 and c 2 are designated. This switch 13 is directly on the electronic clock 10 surrounding housing 14 fixed in such a position that the switch respectively.

sein Temperaturfühler sowohl die vom Backrohr 1 als auch die von der Kochplatte 6 ausgehende Wärme erfassen kann. Demgemäß befindet sich der Schalter 13 etwa in einer mittleren Stellung zwischen Kochplatte 6 und Backrohr 1. In der Figur ist schematisch in Form eines Schaltungsplanes der über den Schalter 13 bzw.its temperature sensor both from the oven 1 and from the Hotplate 6 can detect outgoing heat. Accordingly, the switch is located 13 approximately in a middle position between hotplate 6 and oven 1. In the Figure is schematically in the form of a circuit diagram of the switch 13 or

seine Anschlußelemente c 1 und c2 geführte elektrische Stromkreis verdeutlicht, indem in Reihe zum Schalter 13 die Anschlußelemente a der Kochplatte 6, die Anschlußelemente b der Elektronikuhr 10 und die Anschlußelemente ddes Grillheizkörpers 4 angeschlossen sind. Wird aus irgendeinem Grunde, z. B. infolge Ausfall des Kühlgebläses oder Versagen des Temperatureglers die Umgebungstemperatur im Bereich der Elektronikuhr 10 und damit des Schalters 13 zu hoch, so schaltet der Schalter 13 gleichzeitig die Elektronikuhr 10 sowie die Heizkörper des Herdes, also die Heizung der Kochplatte 6 sowie den Grillheizkörper 4 ab. Damit wird die Elektronikuhr 10 spannungslos und kann wesentlich höhere Umgebungstemperaturen als im Betrieb ertragen. Fällt während dem Betrieb des Herdes die Netzspannung aus, dann ist auch die für die Elektronikuhr 10 notwendige Kühlung durch das Kühlluftgebläse 12 geschaltet. Durch Wärmenachschub von den Heizkörpern her erhöht sich die Temperatur im Schalterraum 8 und es erfolgt nach längerem Spannungsausfall eine Betätigung des Schalters 13 in dem Sinne, daß der in der Figur eingezeichnete Stromkreis unterbrochen ist. Kehrt die Netzspannung wieder, so bleibt der vorgenannte Stromkreis noch so lange unterbrochen, bis die Temperatur an allen Teilen, also vorzugsweise an der Elektronikuhr 10 unter einen kritischen Temperaturwert abgesunken ist. Da die Umgebungstemperatur im Schalterraum 8 sowie am Gehäuse 14 und am Schalter 13 bei wiederkehrender Netzspannung und somit bei wiedereingeschaltetem Kühlluftgebläse 12 schneller wieder absinkt, als die Temperatur an den inneren Bauteilen der Elektronik, wird für den Schalter oder Regler 13 ein großes Schaltspiel gewahlt, derart, daß die Einschalt-Betätigung des Schalters 13, d. h. das Schließen des Stromkreises erst bei einer relativ tiefen Temperatur im Schalterraum 8 erfolgt.its connection elements c 1 and c2 guided electrical circuit made clear by the connection elements a of the hotplate in series with the switch 13 6, the connecting elements b of the electronic clock 10 and the connecting elements d of the grill heating element 4 are connected. If for some reason, e.g. B. due to failure of the cooling fan or failure of the temperature controller the ambient temperature in the area of the electronic clock 10 and thus the switch 13 is too high, the switch 13 switches at the same time the electronic clock 10 and the radiator of the stove, so the heater the hotplate 6 and the grill element 4. The electronic watch 10 is thus de-energized and can withstand significantly higher ambient temperatures than during operation. Falls during If the mains voltage is switched off before the stove is in operation, then the voltage for the electronic clock is also applied 10 necessary cooling switched by the cooling air fan 12. Through a supply of heat from the radiators, the temperature in switch room 8 increases and it takes place after a prolonged power failure actuation of the switch 13 in the sense that the circuit shown in the figure is interrupted. Reverses the line voltage again, the aforementioned circuit remains interrupted until the Temperature on all parts, so preferably on the electronic clock 10 below one critical temperature value has dropped. Because the ambient temperature in the switch room 8 as well as on the housing 14 and on the switch 13 when the mains voltage returns and thus when the cooling air fan 12 is switched on again, it falls again faster than the temperature on the inner components of the electronics, for the switch or controller 13 a large switching cycle selected in such a way that the switch-on actuation of switch 13, d. H. the closing of the circuit only at a relatively low temperature in Switch room 8 takes place.

Claims

Claims: 1. Cooking device, in particular stove, with the hob immediately adjacent electronic devices for time measurement, temperature control or the like, preferably with a device room in which the facilities are housed, cooling fan, d u r c h e -k e n n n n z e i c h n e t that to the electronic device (electronic clock 10) or devices as well to the hotplate (hotplate 6) or hotplates, at least one temperature-dependent Switch (13) is thermally coupled, depending on its ambient temperature the electronic equipment and, if applicable, the hotplates (hotplate 6, grill element 4) switches off and on. 2. Cooking device according to claim 1, characterized in that characterized in that the switch (13) on one of the electronic equipment, preferably an electronic clock (10) surrounding the housing (14) is attached.

3. Cooking device according to claim 1 or 2, characterized in that the switch (13) in the switch room (8) of a stove between an oven (1) and a cooking hob (5) having hotplates is arranged.

The invention is based on a cooking appliance according to the preamble of claim 1.

For cooking appliances, especially for stoves with an oven, a hob arranged above and with a counter space in between, in which electronic devices are housed to control the cooker and be cooled by a cooling fan in operation, there is a problem that with strong Increase in the ambient temperature in the switch room, e.g. B. due to failure of the cooling fan, Welding the contacts of the temperature controller and the like, the electronic, components in operation suffer damage from the increased temperature.

It is a device for switching off the heating current in electrical Cooking appliances depending on the temperature of the food known (DE-PS 9 30 405), in which a temperature switching device is provided, whose temperature-sensitive Switching element thermally conductive connection with one made of a highly thermally conductive metal existing shoe that has a magnetic cling to the wall of an iron Cooking pot is formed. Here, only the temperature in the food is monitored, but not the temperature in the vicinity of the highly heat-sensitive components inside the cooking appliance.

The invention is based on the object of providing a cooking appliance as described in the preamble of claim 1 named type so that for the in the device built-in electronics provide more effective temperature protection in the event of any conceivable malfunction given is.

This object is achieved according to the invention by the characterizing part of claim 1 listed solution features.

So for some reason, e.g. as a result Failure of the cooling fan, Welding the control contacts or the like, the ambient temperature of the sensitive Electronics too high, so the temperature switch switches the electronics, in particular the electronic clock as well as the device heating element, whereby the electronic components be de-energized and withstand a significantly higher ambient temperature undamaged can. The switch or its temperature sensor is on a stove with an oven and hob spatially arranged in such a way that it absorbs both the heat of the oven as also that of the hotplates lying above can detect and overheating can react from different directions.

For example, if the mains voltage drops while the cooker is in operation and thus also the cooling fan for the electronics, the temperature-dependent Switch on the subsequent heat supply, especially from the oven react in such a way that it interrupts the operating circuit of the electronics. If the mains voltage comes back, the electronic components as well as the The device heating element is switched off until all of the above components are under one have cooled down to the critical temperature value. The temperature protection switch is here or controller set so that it only works at a relatively low ambient temperature switches on again, which is important because the cooling fan is running again the ambient temperature of the switch drops much faster than the temperature on or in the components themselves.

The invention is based on the shown in the drawing and embodiment described below explained in more detail.

In the figure, a cooking device in the form of an electric stove is schematically and only shown with the essential parts. Here, 1 denotes an oven, whose muffle, which is open at the front, can be closed by an oven door 2. the Muffle is surrounded by insulating layers 3. Inside the oven 1, just below the ceiling-side muffle wall, an electric grill element 4 is arranged, which should represent the heating of the oven 1. At a distance above the oven 1 a hob 5 is arranged, with a hotplate 6, the heating of which is not is shown separately. The electrical connection element of the aforementioned hotplate heating is denoted by a. The stove shown is a so-called one Built-in stove in which the hob 5 is embedded in a section of a worktop 7 is, while the oven 1 is inserted between the end faces of two kitchen furniture is.