EP0410174A2 - Oven with pyrolytically cleaned muffle - Google Patents

Oven with pyrolytically cleaned muffle Download PDF

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Publication number
EP0410174A2
EP0410174A2 EP19900112845 EP90112845A EP0410174A2 EP 0410174 A2 EP0410174 A2 EP 0410174A2 EP 19900112845 EP19900112845 EP 19900112845 EP 90112845 A EP90112845 A EP 90112845A EP 0410174 A2 EP0410174 A2 EP 0410174A2
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EP
European Patent Office
Prior art keywords
cleaning
heating
muffle
pyrolytic self
pyrolytic
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.)
Ceased
Application number
EP19900112845
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German (de)
French (fr)
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EP0410174A3 (en
Inventor
Franz Dipl.-Ing. Röhrl (FH)
Josef Gerl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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Publication of EP0410174A2 publication Critical patent/EP0410174A2/en
Publication of EP0410174A3 publication Critical patent/EP0410174A3/en
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type

Definitions

  • the invention relates to a method for pyrolytic self-cleaning in a stove, the muffle can be operated by a heating element arranged in a wall area and optionally with additional forced-air heating, the muffle being ventilated by a forced-air fan and equipped with means for pyrolytic self-cleaning.
  • a heating element arranged in a wall area and optionally with additional forced-air heating
  • the muffle being ventilated by a forced-air fan and equipped with means for pyrolytic self-cleaning.
  • DE-PS 21 66 227 and 23 10 290 hearth muffle with means for pyrolytic self-cleaning have become known. It is assumed that mean oven temperatures above 500 ° C must be used for pyrolytic self-cleaning and consequently precautions must be taken so that the switching - Control elements and other functional elements are not subject to overheating.
  • the object of the invention is to provide a stove with means for pyrolytic self-cleaning, as a result of which the oven top temperature is reduced, the CO development is reduced and the life of the enamel layer is increased.
  • the solution to this problem according to the invention is characterized in that the heating phase, which is operated at maximum output, ends the heating phase at approximately 500 ° C. and that the circulating air blower in combination with at least one heating element can then regulate a lower, uniform oven cleaning temperature required for the pyrolytic self-cleaning process is, the pyrolytic self-cleaning takes place at a cleaning temperature which is harmless to the enamel portions of the muffle and reduces carbon monoxide development.
  • FIGS. 1 and 2 a stove is shown according to the prior art.
  • the top heat 2 is realized by grill radiators. 2, the cooking space 1 with the grill heating elements 2 can be removed as a device for the top heat.
  • a baffle wall with suction opening 3 is arranged on the muffle rear wall for circulating air heating operation.
  • FIGS. 1 and 2 belong to the prior art and are intended to meet the requirements necessary for understanding the invention.
  • a certain minimum temperature is required during the cleaning process in order to achieve perfect cleaning of the dirty oven parts (eg inner surfaces of the oven muffle) in the known pyrolytic cleaning.
  • the process according to the invention for pyrolytic self-cleaning is initiated by a rapid heating phase which leads to approximately 500 ° C.
  • the heating-up phase therefore results in a rapid bridging of the CO evolution, which mainly takes place below 400 ° C. Flue gas development and CO development are thus minimized in the heating phase.
  • the end of the heating phase which is at a temperature of 500 ° C, the pyrolytic self-cleaning process begins, which is determined by the fact that the circulating air blower in combination with at least one heating element, e.g.
  • a lower, uniform oven cleaning temperature necessary for the pyrolytic self-cleaning process is adjustable.
  • the upper cleaning temperature does not exceed any temperature values which are harmful to the enamel content of the muffle, the pyrolytic self-cleaning process proceeding perfectly.
  • the carbon monoxide development is integrated and minimized through the self-cleaning process.
  • 3 shows how the circulating air affects the temperature profile in the furnace muffle during self-cleaning operation.
  • Curve 4.1 indicates the self-heating of the motor as a function of the operating voltage UBM.
  • Curve 4.2 shows the relationship that exists between the cooling of the motor by means of a cooling wing attached to the output shaft and the operating voltage of the motor. At the intersection of curves 4.1 and 4.2 there is an engine operating voltage UMO for which there is sufficient engine cooling with reasonable self-heating of the engine. The air recirculation motor is therefore operated with this operating point.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

Method for the pyrolytic cleaning of an oven, the muffle of which can be operated by a heating element arranged in at least one wall region and, if required, with additional recirculated-air heating, the muffle being ventilatable by an air recirculation fan and being equipped with means for pyrolytic cleaning, the heating-up phase being completed at about 500 DEG C by the heating element, which is operated at maximum power, and it then being possible to set a lower, steady oven cleaning temperature required for the pyrolytic cleaning process by means of the air recirculation fan in combination with at least one heating element, the pyrolytic cleaning process proceeding at a cleaning temperature which does not harm the enamel components of the muffle and with reduced carbon monoxide evolution. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zur pyrolytischen Selbstreinigung in ei­nem Herd, dessen Muffel durch ein in einem Wandbereich angeordnetes Heizelement und ggf. mit zusätzlicher Umluftheizung betreibbar ist, wobei die Muffel durch ein Umluft gebläse belüftbar und mit Mitteln zur pyrolytischen Selbstreinigung ausgerü­stet ist. In den DE-PS 21 66 227 und 23 10 290 sind Herdmuffeln mit Mitteln zur pyrolytischen Selbstreinigung bekannt geworden Dabei wird davon ausgegangen, daß zur pyrolytischen Selbstreinigung mittlere Backofentemperaturen oberhalb von 500°C angewendet werden müssen und folglich Vorkehrungen zu treffen sind, damit die Schalt- und Regelorgane sowie andere Funktionselemente keiner Überhitzung unter­liegen.The invention relates to a method for pyrolytic self-cleaning in a stove, the muffle can be operated by a heating element arranged in a wall area and optionally with additional forced-air heating, the muffle being ventilated by a forced-air fan and equipped with means for pyrolytic self-cleaning. In DE-PS 21 66 227 and 23 10 290 hearth muffle with means for pyrolytic self-cleaning have become known. It is assumed that mean oven temperatures above 500 ° C must be used for pyrolytic self-cleaning and consequently precautions must be taken so that the switching - Control elements and other functional elements are not subject to overheating.

Die Aufgabe der Erfindung besteht darin, einen Herd mit Mitteln zur pyrolytischen Selbstreinigung auszustatten, wodurch die Backofenspitzentemperatur abgesenkt, die CO-Entwicklung vermindert und die Lebensdauer der Emaille-Schicht erhöht wird.The object of the invention is to provide a stove with means for pyrolytic self-cleaning, as a result of which the oven top temperature is reduced, the CO development is reduced and the life of the enamel layer is increased.

Die erfindungsgemäße Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß durch das mit maximaler Leistung betriebene Heizelement die Aufheizphase bei ca. 500°C beendet und daß danach durch das Umluftgebläse in Kombination mit mindestens ei­nem Heizelement eine für den pyrolytischen Selbstreinigungsvorgang notwendige un­tere vergleichmäßigte Backofen-Reinigungstemperatur einregelbar ist, wobei die py­rolytische Selbstreinigung bei einer für die Emailleanteile der Muffel unschädlichen Reinigungstemperatur mit reduziert er Kohlemonoxid-Entwicklung abläuft.The solution to this problem according to the invention is characterized in that the heating phase, which is operated at maximum output, ends the heating phase at approximately 500 ° C. and that the circulating air blower in combination with at least one heating element can then regulate a lower, uniform oven cleaning temperature required for the pyrolytic self-cleaning process is, the pyrolytic self-cleaning takes place at a cleaning temperature which is harmless to the enamel portions of the muffle and reduces carbon monoxide development.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen enthaltenAdvantageous embodiments of the invention are contained in the subclaims

Ein Ausführungsbeispiel nach der Erfindung ist im folgenden anhand der Zeichnung näher beschrieben. Es zeigt:

  • Fig. 1 einen Herd nach dem Stand der Technik,
  • Fig. 2 eine Herdmuffel mit Umluftgebläse,
  • Fig. 3 ein Diagramm mit Temperaturzeitverläufen bei pyrolytischer Reinigung,
  • Fig. 4 eine Kennlinie betreffend Motoreigenerwärmung und zugehörige Betriebsspannung.
An embodiment of the invention is described below with reference to the drawing. It shows:
  • 1 is a stove according to the prior art,
  • 2 a muffle with circulating air fan,
  • 3 shows a diagram with temperature time profiles during pyrolytic cleaning,
  • Fig. 4 is a characteristic curve relating to engine internal heating and associated operating voltage.

Gemäß Fig. 1 ist ein Herd nach dem Stand der Technik dargestellt. Ein Garraum 1 und Einrichtungen für eine Oberhitze 2, die für die pyrolytische Selbstreinigung be­nutzt wird, sind erkennbar. Dabei wird die Oberhitze 2 durch Grillheizkörper reali­siert. Gemäß Fig. 2 ist- der Garraum 1 mit den Grillheizkörpern 2 als Einrichtung für die Oberhitze entnehmbar. An der Muffelrückwand ist eine Prallwand mit An­saugöffnung 3 für Umluftheizbetrieb angeordnet. Die gemäß Fig. 1 und Fig. 2 dargestellten Anordnungen gehören zum Stand der Technik und sollen die für das Verständnis der Erfindung notwendigen Voraussetzungen erbringen. Um bei der be­kannten pyrolytischen Reinigung - eine einwandfreie Reinigung der verschmutzten Back- ofenteile (z.B. Innenflächen der Backofenmuffel) zu erreichen, ist eine be­stimmte Minimaltemperatur während des Reingiungsvorganges erforderlich. Je gleichmaßiger die Reinigungstemperatur auf dem verschmutzten Teil ist, je niedriger kann die mittlere Gesamttemperatur gehalten werden, wodurch Schäden an den Emailteilen vermieden werden, ohne das Reinigungsergebnis nachteilig zu beeinflus­sen. Das erfindungsgemäße Verfahren zur pyrolytischen Selbstreinigung wird durch eine schnelle Aufheizphase, die bis ca. 500°C führt, eingeleitet. Die Aufheizphase hat daher eine schnelle Überbrückung der vornehmlich unterhalb 400°C stattfinden­den CO-Entwicklung zur Folge. Rauchgasentwicklung und CO-Entwicklung werden in der Aufheizphase also minimiert. Mit Beendigung der Aufheizphase, temperaturmäßig bei 500°C liegend, beginnt der pyrolytische Selbst reinigungsvorgang, der dadurch be­stimmt ist, daß durch das Umluftgebläse in Kombination mit mindestens einem Heizelement, beispielsweise Grillheizung als Oberhitze, eine für den pyrolytischen Selbstreinigungsvorgang notwendige untere vergleichmäßigte Backofen-Reinigungstem­peratur einregelbar ist. Durch diese Maßnahme überschreitet die obere Reinigungs­temperatur keine für die Emailleanteile der Muffel schädlichen Temperaturwerte, wobei der pyrolytische Selbst reinigungsvorgang einwandfrei verläuft. Darüber hinaus ist die Kohlenstoffmonoxid-Entwicklung über den Selbstreinigungsprozeß integriert, minimiert. Gemäß Fig. 3 ist entnehmbar, wie die Umluft auf den Temperaturverlauf in der Ofenmuffel bei Selbstreinigungsbetrieb einwirkt. Das funktionale Abbild a der Kurvenschar nach Fig. 3 zeigt die an der Garraumdecke auftretende Emailspit­zentemperatur als Funktion der Zeit, für den Parameter Umluft = 0. Man erkennt, daß nach dem eingeschwungenen Zustand eine Spitzentemperatur, die größer als 500°C ist, auftritt. Dies ist für den qualitativen Standwert der Emaille unvorteilhaft, wenngleich die pyrolytische Selbstreinigung bestens verläuft. Das funktionelle Abbild b der Kurvenschar nach Fig. 3 zeigt den im Backofenschwerpunkt auftretenden Tem­peraturverlauf als Funktion der Zeit für den Parameter U = 0. Senkt man die Spit­zentemperatur bei zugeschalteter Umluft so weit ab, daß mittels Pyrolyse noch eine einwandfreie Reinigung der verschmutzten Backofenteile möglich ist, dann erhält man das funktionale Abbild der Kurvenschar a* nach Fig. 3 entsprechend dazu das funktionale Abbild der Kurvenschar b* nach Fig. 3, für den Temperaturverlauf im Backofenschwerpunkt. Aus Fig. 4 ist ersichtlich, wie die Betriebsspannung des Um­luftmotors im Falle der pyrolytischen Selbstreinigung festgelegt ist. Die Kurve 4.1 kennzeichnet die Eigenerwärmung des Motors als Funktion der Betriebsspannung UBM. Die Kurve 4.2 stellt den Zusammenhang dar, der zwischen der Kühlung des Motors durch einen auf der Abtriebswelle befestigten Kühlflügel und der Betriebs­spannung des Motors besteht. Im Schnittpunkt der Kurven 4.1 und 4.2 ergibt sich ei­ne Motorbetriebsspannung UMO, für die eine ausreichende Motorkühlung bei vertret­barer Eigenerwärmung des Motors vorhanden ist. Mit diesem Arbeitspunkt wird daher der Umluftmotor betrieben.1, a stove is shown according to the prior art. A cooking chamber 1 and devices for an upper heat 2, which is used for the pyrolytic self-cleaning, can be seen. The top heat 2 is realized by grill radiators. 2, the cooking space 1 with the grill heating elements 2 can be removed as a device for the top heat. A baffle wall with suction opening 3 is arranged on the muffle rear wall for circulating air heating operation. The arrangements shown in FIGS. 1 and 2 belong to the prior art and are intended to meet the requirements necessary for understanding the invention. A certain minimum temperature is required during the cleaning process in order to achieve perfect cleaning of the dirty oven parts (eg inner surfaces of the oven muffle) in the known pyrolytic cleaning. The more uniform the cleaning temperature is on the soiled part, the lower the mean overall temperature can be kept, causing damage to the Enamel parts can be avoided without adversely affecting the cleaning result. The process according to the invention for pyrolytic self-cleaning is initiated by a rapid heating phase which leads to approximately 500 ° C. The heating-up phase therefore results in a rapid bridging of the CO evolution, which mainly takes place below 400 ° C. Flue gas development and CO development are thus minimized in the heating phase. With the end of the heating phase, which is at a temperature of 500 ° C, the pyrolytic self-cleaning process begins, which is determined by the fact that the circulating air blower in combination with at least one heating element, e.g. grill heating as top heat, a lower, uniform oven cleaning temperature necessary for the pyrolytic self-cleaning process is adjustable. As a result of this measure, the upper cleaning temperature does not exceed any temperature values which are harmful to the enamel content of the muffle, the pyrolytic self-cleaning process proceeding perfectly. In addition, the carbon monoxide development is integrated and minimized through the self-cleaning process. 3 shows how the circulating air affects the temperature profile in the furnace muffle during self-cleaning operation. The functional image a of the family of curves according to FIG. 3 shows the enamel tip temperature occurring on the cooking space ceiling as a function of time, for the circulating air parameter = 0. It can be seen that a peak temperature that is greater than 500 ° C. occurs after the steady state. This is disadvantageous for the quality of the enamel, although the pyrolytic self-cleaning process runs very well. The functional image b of the family of curves according to FIG. 3 shows the temperature profile occurring in the center of the oven as a function of time for the parameter U = 0. If the peak temperature is reduced with the recirculated air switched on, pyrolysis can still clean the dirty oven parts properly , then one obtains the functional image of the family of curves a * according to FIG. 3, corresponding to this the functional image of the family of curves b * according to FIG. 3, for the temperature profile in the center of the oven. From Fig. 4 it can be seen how the operating voltage of the circulating air motor is determined in the case of pyrolytic self-cleaning. Curve 4.1 indicates the self-heating of the motor as a function of the operating voltage UBM. Curve 4.2 shows the relationship that exists between the cooling of the motor by means of a cooling wing attached to the output shaft and the operating voltage of the motor. At the intersection of curves 4.1 and 4.2 there is an engine operating voltage UMO for which there is sufficient engine cooling with reasonable self-heating of the engine. The air recirculation motor is therefore operated with this operating point.

Claims (7)

1. Verfahren zur pyrolytischen Selbstreinigung in einem Herd, dessen Muffel durch ein in wenigstens einem Wandbereich angeordnetes Heizelem ent und ggf. mit zusätzlicher Umluftheizung betreibbar ist, wobei die Muffel durch ein Umluftgebläse belüftbar und mit Mitteln zur pyrolytischen Selbstreinigung ausgerüstet ist, dadurch gekennzeichnet, daß durch das mit maximaler Leistung betriebene Heizelement die Aufheizphase bei ca. 500°C beendet ist und daß danach durch das Umluftgebläse in Kombination mit min­destens einem Heizelement eine für den pyrolytischen Selbst reinigungsvorgang notwendige untere vergleichmäßigte Backofen-Reinigungstemperatur einregel­bar ist, wobei die pyrolytische Selbstreinigung bei einer für die Emailleanteile der Muffel unschädlichen Reinigungstemperatur mit reduzierter Kohlenmono­xid-Entwicklung abläuft.1. A method for pyrolytic self-cleaning in a stove, the muffle ent by a heating element arranged in at least one wall area and possibly operable with additional forced-air heating, the muffle being ventilated by a forced-air fan and equipped with means for pyrolytic self-cleaning, characterized in that the heating phase at approx. 500 ° C is ended by the heating element operated at maximum output and that afterwards a lower, uniform oven cleaning temperature necessary for the pyrolytic self-cleaning process can be adjusted by the circulating air blower in combination with at least one heating element, the pyrolytic self-cleaning at a for the enamel parts of the muffle, the harmless cleaning temperature with reduced carbon monoxide development takes place. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Umluftgebläse nach erfolgter erster Aufheizphase bei pyrolytischer Selbstreinigung bis zum Ende des pyrolytischen Selbstreinigungsprozesses zugeschaltet ist.2. The method according to claim 1, characterized in that the circulating air fan is switched on after the first heating phase in pyrolytic self-cleaning until the end of the pyrolytic self-cleaning process. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Aufheizphase mit minimierter Rauchgas- und Kohlenmonoxid-Entwicklung abläuft.3. The method according to claim 1, characterized in that the heating phase takes place with minimized flue gas and carbon monoxide development. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß neben der Oberhitze eine Teilleistung der Unterhitze zugeschaltet ist.4. The method according to claim 1, characterized in that in addition to the top heat, a partial power of the bottom heat is switched on. 5. Verfahren nach Anspruch 1, 3, dadurch gekennzeichnet, daß das Umluftgebläse während des pyrolytischen Selbstreinigungsprozesses mit reduzierter Drehzahl läuft.5. The method according to claim 1, 3, characterized in that the circulating air fan runs at a reduced speed during the pyrolytic self-cleaning process. 6. Verfahren nach Anspruch 1, 3, dadurch gekennzeichnet, daß das Umluftgebläse während des pyrolytischen Selbst reinigungsprozresses intermittierend arbeitet.6. The method according to claim 1, 3, characterized in that the circulating air blower works intermittently during the pyrolytic self-cleaning process. 7. Herd nach Anspruch 1, dadurch gekennzeichnet, daß die Drehzahl des Um­luftmotors so gewählt ist, daß gemäß Fig. 4 die Motoreigenerwärmung und die Kühlflügelkühlung des Motors ein resultierendes Erwärmungsminimum er­geben.7. Cooker according to claim 1, characterized in that the speed of the recirculation motor is selected so that according to FIG. 4, the engine's own heating and the cooling wing cooling of the engine result in a resulting heating minimum.
EP19900112845 1989-07-26 1990-07-05 Oven with pyrolytically cleaned muffle Ceased EP0410174A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3924782 1989-07-26
DE19893924782 DE3924782A1 (en) 1989-07-26 1989-07-26 STOVE WITH PYROLYTIC SELF-CLEANING OF THE MUFFLE

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EP0410174A2 true EP0410174A2 (en) 1991-01-30
EP0410174A3 EP0410174A3 (en) 1991-06-05

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DD (1) DD295705A5 (en)
DE (1) DE3924782A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4114909A1 (en) * 1991-05-07 1992-11-12 Bosch Siemens Hausgeraete Cooking stove with pyrolytic cleaning system - moves heater element clear of oven walls for pyrolysis
DE4321952B4 (en) * 1993-07-01 2004-05-27 BSH Bosch und Siemens Hausgeräte GmbH Stove with pyrolytic self-cleaning
DE102020121587A1 (en) 2020-08-18 2022-02-24 Miele & Cie. Kg Pyrolytic cleaning of a cooking appliance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678245A (en) * 1968-06-21 1972-07-18 Siemens Elektrogeraete Gmbh Device for cleaning the walls of the muffle chamber of baking and roasting ovens
EP0031755A2 (en) * 1979-12-27 1981-07-08 Etablissements Eugene Scholtes Electric cooking oven for domestic use

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678245A (en) * 1968-06-21 1972-07-18 Siemens Elektrogeraete Gmbh Device for cleaning the walls of the muffle chamber of baking and roasting ovens
EP0031755A2 (en) * 1979-12-27 1981-07-08 Etablissements Eugene Scholtes Electric cooking oven for domestic use

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DE3924782A1 (en) 1991-01-31
DD295705A5 (en) 1991-11-07
EP0410174A3 (en) 1991-06-05

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