EP0596263B1 - Cooking oven - Google Patents

Cooking oven Download PDF

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Publication number
EP0596263B1
EP0596263B1 EP93116010A EP93116010A EP0596263B1 EP 0596263 B1 EP0596263 B1 EP 0596263B1 EP 93116010 A EP93116010 A EP 93116010A EP 93116010 A EP93116010 A EP 93116010A EP 0596263 B1 EP0596263 B1 EP 0596263B1
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EP
European Patent Office
Prior art keywords
heating
switchable
oven
phase
partial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93116010A
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German (de)
French (fr)
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EP0596263A1 (en
Inventor
Josef Gerl
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BSH Hausgeraete GmbH
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Individual
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    • 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
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

  • the invention relates to an oven according to the preamble of claim 1.
  • Such an oven is known from DE-OS 27 57 059, but an operator usually remains unclear when the control device controlling the heating device switches from the heating phase to the continued heating phase.
  • the object of the present invention is to improve an oven of the type mentioned in the preamble of claim 1 in such a way that means are provided by which the user is signaled the heating state in the shortest possible time after switching on the oven. In addition, favorable heating operation should also be guaranteed in the continued heating phase.
  • the end of the heating-up time is only displayed when the oven heating is switched off, and thus at an oven temperature that is significantly above the selected target temperature (settling of the temperature profile)
  • the invention e.g. Optical display when the target temperature is reached, i.e. while the heating is still running. In this way, the user can start cooking the food, e.g. Place the cake in the preheated oven, which not least also saves energy.
  • a further energy saving results from the fact that when the target temperature is at least approached, not only is the end of the heating-up phase signaled, for example by a signal lamp being extinguished, but at the same time the high heating-up power is reduced or switched off and the oven is operated only with one reduced continued heating output is operated. Furthermore, it is advantageous for the heating modes that usually follow that the partial heating power switched off in the continued heating phase is formed by the circulating air heater.
  • a special partial heating output is provided for rapid heating, which can be optionally switched on for each heating mode.
  • the diagram according to Fig. 1 shows the time-temperature curve during the heating of the oven not shown or its oven muffle lockable by a door and during a subsequent heating phase.
  • the curve K1 shows the curve for a conventional oven and you can see that when heating with the maximum heating power installed in the oven at a preselected setpoint temperature or oven temperature T1 of, for example, 200 ° C, the oven temperature actually measured initially overshoots the setpoint temperature T1 and the oven heating is only switched off at a point in time t3 at a time t3 and then with reduced heating power in the continued heating phase after t3, a sinusoidal leveling of the temperature curve around the target temperature T1 takes place.
  • Curve K2 shows the temperature-time curve in the oven when using a special partial heating output in addition to normal oven heating for the benefit phase. It can be seen that this curve shape is steeper, ie that the set temperature T1 is already in a considerably shorter period of time t1 of, for example, 6.5 min. is achieved.
  • the oven control device automatically a switchover from the heating phase to the heating phase is carried out, ie the aforementioned partial heating power is switched off and the overshoot temperature T2 at time t2 is reached with reduced heating power, after which this heating power is also switched off and the thermostatic control process takes place.
  • a special additional display element goes out, e.g. again in the form of a lamp, which signals to the user that - now at a much earlier point in time t1 - the heating phase has ended and that Food can be placed in the oven. The course of the curve.
  • the elements of the oven that are essential for understanding the invention are illustrated with the aid of the circuit diagram shown in FIG. 2.
  • the top heat of the oven for example in the form of an internal radiant heater, is designated by OH and the lower heat of the oven, for example external, is designated by UH.
  • the oven also has a circulating air fan G driven by an electric motor M, which is surrounded, for example, in a ring by a circulating air heater LH.
  • This circulating air heater LH represents the above-mentioned partial heating output for the heating phase, while the other heating elements of the top heat and bottom heat serve to heat the oven during the heating phase and during the heating phase.
  • L1 is a display organ z.3.
  • L2 is another display element, for example also in the form of a lamp, which is directly assigned to the partial heating power LH used for the heating phase, ie is activated when the partial heating power LH is switched on and goes out when this partial heating power is switched off.
  • this additional partial heating output there is a further temperature-dependent switch ST or a second control path of a common thermostat which, depending on the temperature prevailing in the oven, ie when the target temperature has been reached, for example T1 according to FIG.
  • the partial heating output LH and thus the display element L2 also switches off.
  • the normal radiators OH, UH can be switched on using a manually operated switch S1.
  • the switch S2 which can also be operated manually, is identified, for example, as a quick heat-up button and is used to carry out a quick heat-up process by pressing the switch S2 to switch on the additional partial heating power LH, which is then switched off again when the target temperature T1 is reached.

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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)
  • Control Of Resistance Heating (AREA)

Description

Die Erfindung bezieht sich auf einen Backofen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to an oven according to the preamble of claim 1.

Ein derartiger Backofen ist aus der DE-OS 27 57 059 bekannt, wobei eine Bedienperson üblicherweise jedoch im Unklaren bleibt, wann die die Heizeinrichtung kontrollierende Steuereinrichtung von der Anheizphase in die Fortheizphase umschaltet.Such an oven is known from DE-OS 27 57 059, but an operator usually remains unclear when the control device controlling the heating device switches from the heating phase to the continued heating phase.

Aus der GB-A -2 114 828 ist eine Schaltungsanordnung bekannt, die die Heizleistung eines bestimmten Heizelementes zwischen einer vollen Heizleistung in einer Anheizphase und einer reduzierten Heizleistung umschalten kann. Das Ende der Anheizphase wird dabei durch eine besondere Blink-Lampe angezeigt.From GB-A -2 114 828 a circuit arrangement is known which can switch the heating power of a certain heating element between a full heating power in a heating phase and a reduced heating power. The end of the heating phase is indicated by a special flashing lamp.

Aufgabe der vorliegenden Erfindung ist es, einen Backofen der im Oberbegriff des Patentanspruches 1 genannten Art so zu verbessern, daß Mittel vorgesehen sind, durch welche dem Benutzer in kürzestmöglicher Zeit nach dem Einschalten des Backofens der Aufheizzustand signalisiert wird. Daneben soll auch in der Fortheizphase ein günstiger Heizbetrieb gewährleistet sein.The object of the present invention is to improve an oven of the type mentioned in the preamble of claim 1 in such a way that means are provided by which the user is signaled the heating state in the shortest possible time after switching on the oven. In addition, favorable heating operation should also be guaranteed in the continued heating phase.

Diese Aufgabe wird gemäß der Erfindung gelöst durch die Merkmale des Patentanspruches 1. Weitere Ausgestaltungen der Erfindung ergeben sich aus den nachfolgenden Patentansprüchen.This object is achieved according to the invention by the features of patent claim 1. Further developments of the invention result from the following patent claims.

Im Unterschied zu bekannten Backöfen, bei denen eine Anzeige des Endes der Aufheizzeit erst mit dem Abschalten der Backofenheizung erfolgt und damit bei einer Backofentemperatur, die erheblich über der gewählten Solltemperatur liegt (Einschwingen des Temperaturverlaufes), erfolgt erfindungsgemäß die z.B. optische Anzeige beim Erreichen der Solltemperatur, also noch während des Heizbetriebes. Auf diese Weise kann der Benutzer zu einem frühestmöglichen Zeitpunkt das Gargut, z.B. den Kuchen in den vorgeheizten Backofen einbringen, wodurch sich nicht zuletzt auch die Energieersparnis ergibt. Eine weitere Energieerspamis ergibt sich dadurch, daß beim zumindest angenäherten Erreichen der Solltemperatur nicht nur das Ende der Aufheizphase signalisiert wird, beispielsweise durch Erlöschen einer Signallampe, sondern daß gleichzeitig auch die hohe Anheiz-Heizleistung reduziert bzw. abgeschaltet wird und der Backofen nur noch mit einer reduzierten Fortheiz-Heizleistung betrieben wird. Weiterhin ist es für die üblicherweise nachfolgenden Heizbetriebsarten vorteilhaft, daß die in der Fortheizphase abgeschaltete Teilheizleistung durch den Umluftheizkörper gebildet ist.In contrast to known ovens, in which the end of the heating-up time is only displayed when the oven heating is switched off, and thus at an oven temperature that is significantly above the selected target temperature (settling of the temperature profile), according to the invention, e.g. Optical display when the target temperature is reached, i.e. while the heating is still running. In this way, the user can start cooking the food, e.g. Place the cake in the preheated oven, which not least also saves energy. A further energy saving results from the fact that when the target temperature is at least approached, not only is the end of the heating-up phase signaled, for example by a signal lamp being extinguished, but at the same time the high heating-up power is reduced or switched off and the oven is operated only with one reduced continued heating output is operated. Furthermore, it is advantageous for the heating modes that usually follow that the partial heating power switched off in the continued heating phase is formed by the circulating air heater.

Um die Aufheizung des Backofens insgesamt zu beschleunigen, ist zur Schnellaufheizung eine besondere Teil-Heizleistung vorgesehen, die wahlweise zu jeder Heizbetriebsart zugeschaltet werden kann.In order to accelerate the heating of the oven as a whole, a special partial heating output is provided for rapid heating, which can be optionally switched on for each heating mode.

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispieles nachstehend erläutert.The invention is explained below using an exemplary embodiment shown in the drawing.

Es zeigt:

Fig. 1
ein Temperatur-Zeit-Diagramm zur Verdeutlichung des Aufheizvorganges,
Fig. 2
ein vereinfachtes Schaltbild der Steuereinrichtung des Backofens.
It shows:
Fig. 1
a temperature-time diagram to illustrate the heating process,
Fig. 2
a simplified circuit diagram of the control device of the oven.

Das Diagramm gemäß Fig.1 zeigt den Zeit-Temperatur-Verlauf während des Aufheizens des nicht weiter dargestellten Backofens bzw. seiner durch eine Tür verschließbaren Backofenmuffel und während einer anschließenden Fortheizphase.Die Kurve K1 zeigt den Verlauf bei einem konventionellen Backofen und man sieht, daß beim Anheizen mit der maximal im Backofen installierten Heizleistung bei einer vorgewählten Solltemperatur oder Backofentemperatur T1 von z.B. 200°C die tatsächlich gemessene Backofentemperatur zunächst die Solltemperatur T1 überschwingt und erst bei einer wesentlich höheren Überschwing-Temperatur T2 zu einem Zeitpunkt t3 die Backofenheizung ausgeschaltet wird und anschließend mit reduzierter Heizleistung in der Fortheizphase nach t3 ein sinusförmiges Einpendeln des Temperaturverlaufes um die Solltemperatur T1 erfolgt. Zum Zeitpunkt t3 erlischt das z.B. als Backofenlampe ausgebildete Anzeigeorgan, womit dem Benutzer signalisiert wird, daß nun der Backofen die zum Einschieben von Gargut, z.B. eines Kuchens geeignete Solltemperatur aufweist, d.h. der Anheizvorgang beendet ist. Die Kurve K2 zeigt den Temperatur-Zeit-Verlauf im Backofen bei Verwendung einer besonderen Teil-Heizleistung zusätzlich zur normalen Backofenbeheizung für die Vorteilsphase. Man sieht, daß dieser Kurvenverlauf steiler ist, d.h. daß die Solltemperatur T1 schon in wesentlich kürzerer Zeitspanne t1 von z.B. 6,5 min. erreicht wird. Zu diesem Zeitpunkt t1 bei zumindest annäherndem Erreichen der Solltemperatur T1 wird selbsttätig durch die Backofen-Steuereinrichtung eine Umschaltung von der Anheizphase zur Fortheizphase vorgenommen, d.h. es wird die vorgenannte Teil-Heizleistung abgeschaltet und die Überschwingtemperatur T2 zum Zeitpunkt t2 wird mit verminderter Heizleistung erreicht, wonach auch diese Heizleistung abgeschaltet wird und der thermostatische Regelvorgang stattfindet. Gleichzeitig mit dem Umschalten von Anheizphase zu Fortheizphase, d.h. mit Erreichen der Solltemperatur T1 erlischt ein besonderes, zusätzliches Anzeigeorgan, z.B. wiederum in Lampenform, womit dem Benutzer signalisiert wird, daß - nunmehr zu einem wesentlich früheren Zeitpunkt t1 - nun die Anheizphase beendet Ist und das Gargut in den Backofen eingebracht werden kann. Der Kurvenverlauf. insb. der Verlauf der Kurve K2 zeigt deutlich, daß auf diese Weise eine wesentliche Reduzierung der für den Benutzer erkennbaren Anheizphase zumindest um die Zeitdifferenz von t1 zu t2 erhalten wird. Durch Zuordnung einer besonderen Teil-Heizleistung für die Anheizphase wird die gewonnene Zeitersparnis noch größer, nämlich um die Zeitdifferenz t1 zu t3.The diagram according to Fig. 1 shows the time-temperature curve during the heating of the oven not shown or its oven muffle lockable by a door and during a subsequent heating phase. The curve K1 shows the curve for a conventional oven and you can see that when heating with the maximum heating power installed in the oven at a preselected setpoint temperature or oven temperature T1 of, for example, 200 ° C, the oven temperature actually measured initially overshoots the setpoint temperature T1 and the oven heating is only switched off at a point in time t3 at a time t3 and then with reduced heating power in the continued heating phase after t3, a sinusoidal leveling of the temperature curve around the target temperature T1 takes place. At time t3, the display element, for example in the form of an oven lamp, goes out, signaling to the user that the oven now has the desired temperature suitable for inserting food, for example a cake, ie the heating process has ended. Curve K2 shows the temperature-time curve in the oven when using a special partial heating output in addition to normal oven heating for the benefit phase. It can be seen that this curve shape is steeper, ie that the set temperature T1 is already in a considerably shorter period of time t1 of, for example, 6.5 min. is achieved. At this time t1 when the target temperature T1 is at least approximately reached, the oven control device automatically a switchover from the heating phase to the heating phase is carried out, ie the aforementioned partial heating power is switched off and the overshoot temperature T2 at time t2 is reached with reduced heating power, after which this heating power is also switched off and the thermostatic control process takes place. Simultaneously with the changeover from the heating phase to the heating phase, i.e. when the target temperature T1 is reached, a special additional display element goes out, e.g. again in the form of a lamp, which signals to the user that - now at a much earlier point in time t1 - the heating phase has ended and that Food can be placed in the oven. The course of the curve. in particular the course of curve K2 clearly shows that in this way a significant reduction in the heating phase recognizable to the user is obtained, at least by the time difference from t1 to t2. By assigning a special partial heating output for the heating phase, the time saved is even greater, namely by the time difference t1 to t3.

Anhand des vereinfacht dargestellten Schaltbildes gemäß Fig. 2 seien die für das Verständnis der Erfindung wesentlichen Elemente des Backofens verdeutlicht. Mit OH ist die Backofen-Oberhitze, z.B. in Form eines innenliegenden Strahlungsheizkörpers und mit UH die z.B. außenliegende Unterhitze des Backofens bezeichnet. Der Backofen weist ferner ein durch einen Elektromotor M angetriebens Umluftgebläse G auf, welches z.B. ringförmig umgeben ist von einem Umluft-Heizkörper LH. Dieser Umluft-Heizkörper LH stellt die vorerwähnte Teil-Heizleistung für die Anheizphase dar, während die übrigen Heizkörper der Oberhitze und Unterhitze für die Aufheizung des Backofens während der Anheizphase und während der Fortheizphase dienen. Mit L1 ist ein Anzeigeorgan z.3. in Form einer Lampe bezeichnet, die bei thermostatisch kontrolliertem Betrieb der normalen Heizleistungen OH und UH oder aber nur bei 3etrieb des Umluft-Gebläses G eingeschaltet ist und mit Abschalten dieser Heizleistung erlischt. Mit L2 ist ein weiteres Anzeigeorgan, z.B. ebenfalls in Form einer Lampe bezeichnet, die unmittelbar der für die Anheizphase dienenden Teil-Heizleistung LH zugeordnet ist, d.h. bei eingeschalteter Teil-Heizleistung LH aktiviert ist und mit dem Abschalten dieser Teil-Heizleistung erlischt. Im Stromzweig dieser zusätzlichen Teil-Heizleistung befindet sich ein weiterer temperaturabhängiger Schalter ST oder eine zweite Steuerbahn eines gemeinschaftlichen Thermostaten, der In Abhängigkeit von der im Backofen herrschenden Temperatur, d.h. bei Erreichen der Solltemperatur z.B. T1 gemäß Fig. 1 die Teil-Heizleistung LH und damit auch das Anzeigeorgan L2 abschaltet. Mittels eines von Hand betätigbaren Schaltern S1 können die normalen Heizkörper OH, UH eingeschaltet werden. Der ebenfalls von Hand betätigbare Schalter S2 ist z.B. als Schnellaufheiz-Taste gekennzeichnet und dient der Durchführung eines Schnellaufheiz-Vorganges, indem mit Betätigen dieses Schalters S2 die zusätzliche Teil-Heizleistung LH eingeschaltet wird, die dann mit Erreichen der Solltemperatur T1 wieder abgeschaltet wird.The elements of the oven that are essential for understanding the invention are illustrated with the aid of the circuit diagram shown in FIG. 2. The top heat of the oven, for example in the form of an internal radiant heater, is designated by OH and the lower heat of the oven, for example external, is designated by UH. The oven also has a circulating air fan G driven by an electric motor M, which is surrounded, for example, in a ring by a circulating air heater LH. This circulating air heater LH represents the above-mentioned partial heating output for the heating phase, while the other heating elements of the top heat and bottom heat serve to heat the oven during the heating phase and during the heating phase. With L1 is a display organ z.3. in the form of a lamp, which is switched on during thermostatically controlled operation of the normal heating outputs OH and UH or only when the circulating air blower G is operated and goes out when this heating output is switched off. L2 is another display element, for example also in the form of a lamp, which is directly assigned to the partial heating power LH used for the heating phase, ie is activated when the partial heating power LH is switched on and goes out when this partial heating power is switched off. In the current branch of this additional partial heating output there is a further temperature-dependent switch ST or a second control path of a common thermostat which, depending on the temperature prevailing in the oven, ie when the target temperature has been reached, for example T1 according to FIG. 1, the partial heating output LH and thus the display element L2 also switches off. The normal radiators OH, UH can be switched on using a manually operated switch S1. The switch S2, which can also be operated manually, is identified, for example, as a quick heat-up button and is used to carry out a quick heat-up process by pressing the switch S2 to switch on the additional partial heating power LH, which is then switched off again when the target temperature T1 is reached.

Claims (3)

  1. Baking oven with a heating equipment and a control equipment, which controls this heating equipment and by means of which the full heating power is switchable on in an initial heating phase and switchable over automatically into a continued heating phase with reduced heating power in dependence on the chosen target temperature, wherein the heating operation is indicated by a display organ perceivable according to operation and a partial heating power provided for the initial heating phase is switchable off automatically on reaching the target temperature and the heating equipment is switchable over automatically to continued heating operation, characterised thereby, that the partial heating power (LH) is associated with an own display organ (L2), which is perceivable according to operation and switchable automatically simultaneously with the switching-over to the continued heating operation and that the partial heating power (LH) is formed by a circulating air heating element (LH) associated with a circulating air blower (G).
  2. Baking oven according to claim 1, characterised thereby, that the partial heating power (LH) is switchable into the different kinds of heating operation by manual operation of a fast initial heating switching organ (S2).
  3. Baking oven according to claim 2, characterised thereby, that the circulating air heating element (LH) is switchable into the kinds of heating operation, for example circulating air operation and upper heat operation and/or lower heat operation.
EP93116010A 1992-11-06 1993-10-04 Cooking oven Expired - Lifetime EP0596263B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4237570 1992-11-06
DE4237570A DE4237570A1 (en) 1992-11-06 1992-11-06 oven

Publications (2)

Publication Number Publication Date
EP0596263A1 EP0596263A1 (en) 1994-05-11
EP0596263B1 true EP0596263B1 (en) 1997-09-10

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US (1) US5432321A (en)
EP (1) EP0596263B1 (en)
DE (2) DE4237570A1 (en)
ES (1) ES2109410T3 (en)
TR (1) TR28321A (en)

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SU1045414A1 (en) * 1982-05-17 1983-09-30 Специальное Конструкторское Бюро Стоматологического Оборудования И Электродвигателей Electric heating device for oral jet injector
US4897526A (en) * 1987-12-17 1990-01-30 Frank Anthony Kiln automatic power level switching and display mechanism
DE3921085A1 (en) * 1989-06-28 1991-01-03 Licentia Gmbh Cooker with device for automatic roasting of meat - has variable type and size in roasting compartment of cooker and selected variable added roasting time
US4990750A (en) * 1989-11-09 1991-02-05 Raytheon Company Independently powered safety device
DE4003442A1 (en) * 1990-02-06 1991-08-08 Guenther Cloer Electric waffle iron or grill plate - has hinged construction and signal controls in thermally isolated housing in bottom section
DE4004309A1 (en) * 1990-02-13 1991-08-14 Ego Elektro Blanc & Fischer DISPLAY DEVICE FOR COOKING EQUIPMENT
DE4029181A1 (en) * 1990-09-14 1992-03-19 Miele & Cie Baking oven with different types of heating - switches on e.g. upper, lower, heating elements, grill and convection heater during initial heat-up phase
DE4115489A1 (en) * 1991-05-11 1992-11-12 Miele & Cie METHOD AND DEVICE FOR CONTROLLING A BAKING / FRYING PROCESS

Also Published As

Publication number Publication date
DE59307326D1 (en) 1997-10-16
EP0596263A1 (en) 1994-05-11
ES2109410T3 (en) 1998-01-16
US5432321A (en) 1995-07-11
DE4237570A1 (en) 1994-05-11
TR28321A (en) 1996-04-25

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