EP0632232B1 - Stove having a pyrolytic self-cleaning provision - Google Patents

Stove having a pyrolytic self-cleaning provision Download PDF

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Publication number
EP0632232B1
EP0632232B1 EP94108227A EP94108227A EP0632232B1 EP 0632232 B1 EP0632232 B1 EP 0632232B1 EP 94108227 A EP94108227 A EP 94108227A EP 94108227 A EP94108227 A EP 94108227A EP 0632232 B1 EP0632232 B1 EP 0632232B1
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EP
European Patent Office
Prior art keywords
oven
cleaning
pyrolytic self
self
time
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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
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EP94108227A
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German (de)
French (fr)
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EP0632232A1 (en
Inventor
Uwe Dipl.-Ing. Has
Manfred Dipl.-Ing. Plankl
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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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
    • 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 stove with pyrolytic Self-cleaning, the muffle by one in at least one Wall area arranged heating element and optionally with additional air heating can be operated, the muffle ventilated by a forced air fan and with pyrolytic agents Self-cleaning is equipped and in the exhaust air the muffle is a gas sensor connected to an evaluation unit is arranged.
  • a stove with pyrolytic Self-cleaning the muffle by one in at least one Wall area arranged heating element and optionally with additional air heating can be operated, the muffle ventilated by a forced air fan and with pyrolytic agents Self-cleaning is equipped and in the exhaust air the muffle is a gas sensor connected to an evaluation unit is arranged.
  • the energy consumption in the previously known methods of pyrolytic self-cleaning to eliminate the above Soiling was defined by one on one Time kept high temperature marked from 480 to 500 °.
  • the object of the invention is that for the pyrolytic Self-cleaning process required heating energy to a necessary Minimize dimensions without affecting existing ones Herds major changes need to be made.
  • FIG. 1 shows this in the course of the curve 2.
  • the curve profile according to FIG. 1 according to FIG. 1 is what has already been said removable, i.e. a heating-up time of 40 minutes, a holding time of 80 minutes and the one that starts afterwards Cooling process without heating operation. You want the pyrolysis process improve energetically, i.e.
  • the duration of the heating-up time depends on which stove-specific designs and sizes of the cooking space, how far the stove is when the Pyrolysis is already warmed up and how high the Mains voltage during the pyrolysis period. According to Fig. 1 of the curve profile 1 can be seen that at one Starting temperature of 200 ° C after an oven process the pyrolysis heating-up time can be shortened significantly, with the subsequent standard holding time of 80 minutes consequently the process faster and less energy.
  • FIG. 2 a diagram is shown which uses the prevailing mains voltage as a parameter and, depending on the starting temperature, indicates the shortening of the heating-up time that then occurs.
  • the reference numerals 3 to 8 mean different parameters of the mains voltage.
  • Reference number 3 corresponds to a mains voltage of 215 V
  • Reference number 4 corresponds to a mains voltage of 220 V
  • Reference number 5 corresponds to a mains voltage of 225 V
  • Reference number 6 corresponds to a mains voltage of 230 V
  • Reference number 7 corresponds to a mains voltage of 235 V
  • Reference number 8 corresponds to a mains voltage of 240 V.
  • the evaluation unit is dependent of the real mains voltage for the respective Oven outlet temperature as parameter the heating time corrected.
  • the evaluation unit ends the pyrolytic Self-cleaning process after a holding time of approx. 80 minutes, the holding time when the pyrolysis setpoint temperature is reached, which depends on the degree of pollution analysis, begins.
  • the holding time is the maximum guideline time understand an underlying time can from the evaluation unit be specified when the degree of pollution analysis this justifies.
  • the evaluation unit breaks after the total time by the heating time and the holding time given, the self-cleaning heating process of 120 minutes from.
  • the evaluation unit makes sense that do not exceed an upper pyrolysis temperature of 480 ° C otherwise the enamelled parts of the stove interior Get damaged. Therefore the evaluation unit as the maximum pyrolysis setpoint temperature of 480 ° C.

Abstract

In a stove having a pyrolytic self-cleaning provision, the muffle of which stove can be operated by a heating element, arranged in at least one wall region, and optionally with additional circulating-air heating, the muffle being able to be ventilated by a circulating-air fan and being equipped with means for pyrolytic self-cleaning, and a gas sensor connected to an evaluation unit being arranged in the outgoing-air path of the muffle, the evaluation unit suggests a pyrolytic self-cleaning process to the user when a sensor-monitored, defined degree of soiling exists, when a baking oven starting temperature corresponds to a temperature-time profile which can be scanned in the evaluation unit. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Herd mit pyrolytischer Selbstreinigung, dessen Muffel durch ein in wenigstens einem Wandbereich angeordnetes Heizelement und gegebenenfalls mit zusätzlicher Umluftheizung betreibbar ist, wobei die Muffel durch ein Umluftgebläse belüftbar und mit Mitteln zur pyrolytischen Selbstreinigung ausgerüstet ist und im Abluftweg der Muffel ein mit einer Auswerteeinheit verbundener Gassensor angeordnet ist. Ein solcher Herd ist im Dokument EP-A-0 529 352 offenbart.The invention relates to a stove with pyrolytic Self-cleaning, the muffle by one in at least one Wall area arranged heating element and optionally with additional air heating can be operated, the muffle ventilated by a forced air fan and with pyrolytic agents Self-cleaning is equipped and in the exhaust air the muffle is a gas sensor connected to an evaluation unit is arranged. Such a range is disclosed in document EP-A-0 529 352.

Beim Braten, Garen und Backen werden die Innenseiten einer Herdmuffel in unterschiedlicher Weise verschmutzt, wobei die Verschmutzung aus Fettresten tierischer und pflanzlicher Art, unterschiedlichen Gargutresten und Kondensationsprodukten von Wrasenbestandteilen besteht.When roasting, cooking and baking, the inside becomes one Muffle soiled in different ways, the Contamination from fat residues from animal and vegetable Type, different food residues and condensation products consists of vapor components.

Der Energieverbrauch bei den bisherig bekannten Methoden der pyrolytischen Selbstreinigung zur Beseitigung der oben genannten Verschmutzungsarten war durch eine auf eine definierte Zeit hoch gehaltene Temperatur von 480 bis 500° gekennzeichnet. The energy consumption in the previously known methods of pyrolytic self-cleaning to eliminate the above Soiling was defined by one on one Time kept high temperature marked from 480 to 500 °.

Aufgabe der Erfindung ist es, die für den pyrolytischen Selbstreinigungsvorgang benötigte Heizenergie auf ein notwendiges Maß zu minimieren, ohne daß dafür an bestehenden Herden wesentliche Änderungen vorgenommen werden müssen.The object of the invention is that for the pyrolytic Self-cleaning process required heating energy to a necessary Minimize dimensions without affecting existing ones Herds major changes need to be made.

Die erfindungsgemäße Lösung dieser Aufgabe ist dem kennzeichnenden Teil der Anspruchs 1 zu entnehmen. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen dargestellt.The inventive solution to this problem can be found in the characterizing part of claim 1. Further advantageous configurations the invention are set out in the subclaims.

Ein Ausführungsbeispiel nach der Erfindung ist im folgenden anhand der Zeichnung näher beschrieben.An embodiment according to the invention is as follows described in more detail with reference to the drawing.

Es zeigt:

Fig. 1
ein Temperaturzeitprofil für das pyrolytische Reinigungsverfahren,
Fig. 2
ein Temperaturzeitkurvenbild mit der Netzspannung als Parameter.
It shows:
Fig. 1
a temperature-time profile for the pyrolytic cleaning process,
Fig. 2
a temperature-time curve with the mains voltage as a parameter.

Gemäß Figur 1 ist erkennbar, daß der pyrolytische Selbstreiniungsvorgang sich aus drei Phasen zusammensetzt:

  • 1. einer Aufheizzeit, das ist die Zeit, während der der Herd auf Selbstreinigungstemperatur, die etwa bei 480° C liegt, gebracht wird;
  • 2. einer Haltezeit, das ist die Zeit, während der der Herd auf Selbstreinigungstemperatur gehalten wird, die wesentliche Zeit, in der der Pyrolyseprozeß abläuft, und
  • 3. einer Abkühlzeit, das ist die Zeit, während der der Herd heizungslos zurückkühlt.
    • According to FIG. 1 it can be seen that the pyrolytic self-cleaning process is composed of three phases:
  • 1. a heating-up time, this is the time during which the stove is brought to self-cleaning temperature, which is approximately 480 ° C .;
  • 2. a holding time, that is the time during which the stove is kept at self-cleaning temperature, the essential time during which the pyrolysis process takes place, and
  • 3. a cooling time, this is the time during which the stove cools down without heating.

    • Besitzt die Herdmuffel-Raumtemperatur, also ca. 20° C, so ergibt sich im allgemeinen eine Aufheizzeit von ca. 40 Minuten, bis die Pyrolysetemperatur von ca. 480° C erreicht ist. Danach wird eine 80 Minutendauer für den pyrolytischen Selbstreinigungsvorgang vorgeschrieben. Insgesamt ist der Vorschrift nach DIN zu entnehmen, daß die Gesamtzeit des Pyrolysevorganges bis zum Abkühlprozeß 120 Minuten nicht überschreiten darf. Figur 1 zeigt dies im Kurvenverlauf 2. Dem Kurvenverlauf nach 2 gemäß Fig. 1 ist das bereits gesagte entnehmbar, also eine Aufheizdauer von 40 Minuten, eine Haltezeit von 80 Minuten und der danach einsetzende Abkühlungsprozeß ohne Heizbetrieb. Will mann den Pyrolysevorgang energetisch verbessern, d.h. mit möglichst geringer Energie den pyrolytischen Selbstreinigungsvorgang mit den vorgeschriebenen Temperaturen durchführen, so ergibt sich, daß lediglich bei der Verkürzung der Aufheizzeit ein Einsparungseffekt möglich ist. Die Dauer der Aufheizzeit hängt davon ab, welche herdspezifischen Konstruktionen und Größen des Garraumes vorliegen, wie weit der Herd bei Start des Pyrolysebetriebes bereits erwärmt ist und wie hoch die Netzspannung im Durchführungszeitraum der Pyrolyse ist. Gemäß Fig. 1 des Kurvenverlaufs 1 ist erkennbar, daß bei einer Starttemperatur von 200° C nach einem Backofenvorgang die Pyrolyseaufheizzeit wesentlich verkürzt werden kann, mit der anschließenden Normhaltezeit von 80 Minuten verläuft demzufolge der Prozeß schneller und energieärmer. Hält man also die Haltezeit des pyrolytischen Selbstreinigungsvorganges konstant, so kann ein Energiegewinn realisiert werden, der proportianal zum Zeitgewinn während der Aufheizzeit entsprechend der Starttemperatur in der Muffel abläuft. Setzt man eine konstante Netzspannung voraus, beispielsweise 225 V, so ergeben sich bei konstanter Haltezeit Gesamtersparnis in Minuten von 4 Minuten für 100° C Starttemperatur bis hin zu 16 Minuten bei Starttemperaturen von 300° C. Für einen mittleren Wert der Backofenstarttemperatur von 150° C werden beispielsweise 7 Minuten erspart, was etwa 5,3 % der Gesamtdauer und einem dazu proportional liegenden Energiegewinn entspricht.Has the range muffle room temperature, i.e. about 20 ° C, so there is generally a heating-up time of approx. 40 minutes, until the pyrolysis temperature reaches approx. 480 ° C is. After that, an 80 minute duration for the pyrolytic Self-cleaning process prescribed. Overall, the Regulation according to DIN that the total time of the Pyrolysis process until the cooling process 120 minutes may exceed. FIG. 1 shows this in the course of the curve 2. The curve profile according to FIG. 1 according to FIG. 1 is what has already been said removable, i.e. a heating-up time of 40 minutes, a holding time of 80 minutes and the one that starts afterwards Cooling process without heating operation. You want the pyrolysis process improve energetically, i.e. with as little as possible Energy the pyrolytic self-cleaning process with the the specified temperatures, that only by reducing the heating time a saving effect is possible. The duration of the heating-up time depends depends on which stove-specific designs and sizes of the cooking space, how far the stove is when the Pyrolysis is already warmed up and how high the Mains voltage during the pyrolysis period. According to Fig. 1 of the curve profile 1 can be seen that at one Starting temperature of 200 ° C after an oven process the pyrolysis heating-up time can be shortened significantly, with the subsequent standard holding time of 80 minutes consequently the process faster and less energy. So you hold the hold time of the pyrolytic self-cleaning process constant, so an energy gain can be realized the proportianal to save time during the Heating time according to the start temperature in the muffle expires. Assuming a constant mains voltage, for example 225 V results in a constant hold time Total savings in minutes of 4 minutes for 100 ° C start temperature up to 16 minutes at start temperatures of 300 ° C. For an average value of the oven start temperature of 150 ° C saves 7 minutes, for example about 5.3% of the total duration and a proportionally related one Energy gain corresponds.

    Es ist außerdem möglich, über verschiedene Sensortechnik und deren Verbindung mit der Auswerteeinheit die notwendige Pyrolysedauer nach Verschutzungsart und Verschmutzungsgrad zu reduzieren. Das würde bedeuten, daß die Haltezeit auf einer der Verschmutzung entsprechenden Temperaturhöhe und Zeitdauer abläuft.It is also possible to use different sensor technology and their connection to the evaluation unit the necessary Pyrolysis time according to type of pollution and degree of pollution to reduce. That would mean that the hold time is on a temperature level corresponding to the pollution and Time expires.

    Gemäß Figur 2 ist ein Diagramm dargestellt, das als Parameter die jeweilig herrschende Netzspannung heranzieht und in Abhängigkeit von der Starttemperatur die dann auftretende Verkürzung der Aufheizzeit anbgibt. Dabei bedeuten die Bezugszeichen 3 bis 8 verschiedene Parameter der Netzspannung.
    Bezugszeichen 3 entspricht einer Netzspannung von 215 V,
    Bezugszeichen 4 entspricht einer Netzspannung von 220 V,
    Bezugszeichen 5 entspricht einer Netzspannung von 225 V,
    Bezugszeichen 6 entspricht einer Netzspannung von 230 V,
    Bezugszeichen 7 entspricht einer Netzspannung von 235 V und
    Bezugszeichen 8 entspricht einer Netzspannung von 240 V.    According to FIG. 2, a diagram is shown which uses the prevailing mains voltage as a parameter and, depending on the starting temperature, indicates the shortening of the heating-up time that then occurs. The reference numerals 3 to 8 mean different parameters of the mains voltage.
    Reference number 3 corresponds to a mains voltage of 215 V,
    Reference number 4 corresponds to a mains voltage of 220 V,
    Reference number 5 corresponds to a mains voltage of 225 V,
    Reference number 6 corresponds to a mains voltage of 230 V,
    Reference number 7 corresponds to a mains voltage of 235 V and
    Reference number 8 corresponds to a mains voltage of 240 V.

    Unter der Annahme von einer Netzspannung die bei 225 V liegt ergibt sich also gemäß Kurve 5 für eine Starttemperatur von 200° C eine Aufheizzeit von 30 Minuten. Dies ist genau aus dem gemäß Fig. 1 erkennbaren Diagrammverlauf 1 ablesbar. Gemäß Fig. 2 des Kurvenverlaufs 5 ist auch der Startpunkt des Kurvenverlaufes 2 entnehmbar. So ist ablesbar, daß bei einer Raumtemperatur von 20 bis 25° C die Aufheizzeit 40 Minuten betägt, entsprechend auch Diagrammverlauf 2 gemäß Fig. 1. Die Zeitgewinne für steigende Netzspannungen sind zwar nicht erheblich, aber immerhin im Gesamtverlauf bedeutend. Unter dem Aspekt der Energieeinsparung erscheint es sinnvoll, daß die Auswerteeinheit dem Benutzer dann einen pyrolytischen Selbstreinigungsvorgang vorschlägt, wenn durch einen vorhergegangenen Backofenvorgang die Starttemperatur für den pyrolytischen Selbstreinigungsvorgang oberhalb 100° C liegt. Für Temperaturen unterhalb 100° C ist der Gewinn an Energie und Gesamtzeit nicht so wesentlich. Hinzu kommt, daß die Auswerteeinheit in Abhängigkeit von der realen Netzspannung für die jeweilige Backofenausgangstemperatur als Parameter die Aufheizzeit korrigiert. Die Auswerteeinheit beendet den pyrolytischen Selbstreinigungsvorgang nach einer Haltezeit von ca. 80 Minuten, wobei die Haltezeit mit erreichen der Pyrolysesollwerttemperatur, die von der Verschmutzungsgradanalyse abhängt, beginnt. Die Haltezeit ist als maximale Richtzeit zu verstehen, eine darunter liegende Zeit kann von der Auswerteeinheit vorgegeben werden, wenn die Verschmutzungsgradanalyse dies rechtfertigt. Wünscht der Benutzer ohne Empfehlung der Auswerteeinheit einen pyrolytischen Selbstreinigungsvorgang und startet er ihn ohne einen vorhergegangenen Backofenvorgang, dann bricht die Auswerteeinheit nach der Gesamtzeit, die durch die Aufheizzeit und die Haltezeit gegeben ist, von 120 Minuten den Selbstreinigungsaufheizungsprozeß ab. Darüber hinaus ist es sinnvoll, daß eine obere Pyrolysetemperatur von 480° C nicht überschritten wird, da sonst die emaillierten Bestandteile des Herdinnenraumes Schaden nehmen. Deshalb läßt die Auswerteeinheit als maximale Pyrolysesollwerttemperatur 480° C zu.Assuming a mains voltage at 225 V lies according to curve 5 for a starting temperature a heating time of 30 minutes at 200 ° C. This is exactly from the diagram 1 that can be seen in FIG. 1 readable. 2 of the curve 5 is also the Starting point of curve 2 can be seen. So it's readable that at a room temperature of 20 to 25 ° C the heating time 40 minutes, corresponding to the diagram 2 according to FIG. 1. The time savings for increasing mains voltages are not significant, but at least in the overall course significant. From the aspect of energy saving it makes sense that the evaluation unit to the user then a pyrolytic self-cleaning process suggests if through a previous oven operation the start temperature for the pyrolytic self-cleaning process is above 100 ° C. For temperatures below The gain in energy and total time is not 100 ° C so essential. In addition, the evaluation unit is dependent of the real mains voltage for the respective Oven outlet temperature as parameter the heating time corrected. The evaluation unit ends the pyrolytic Self-cleaning process after a holding time of approx. 80 minutes, the holding time when the pyrolysis setpoint temperature is reached, which depends on the degree of pollution analysis, begins. The holding time is the maximum guideline time understand an underlying time can from the evaluation unit be specified when the degree of pollution analysis this justifies. The user wishes without Recommendation of the evaluation unit a pyrolytic self-cleaning process and he starts it without a previous one Oven process, then the evaluation unit breaks after the total time by the heating time and the holding time given, the self-cleaning heating process of 120 minutes from. In addition, it makes sense that do not exceed an upper pyrolysis temperature of 480 ° C otherwise the enamelled parts of the stove interior Get damaged. Therefore the evaluation unit as the maximum pyrolysis setpoint temperature of 480 ° C.

    Claims (6)

    1. Oven with pyrolytic self-cleaning, the oven chamber of which is operable by a heating element, which is arranged in at least one wall region, and optionally with additional circulating air heating, wherein the oven chamber can be loaded with air by an air circulation blower and is equipped with means for pyrolytic self-cleaning and a gas sensor connected with an evaluating unit is arranged in the exhaust air path of the oven chamber, characterised in that the evaluating unit proposes a pyrolytic self-cleaning process to the user when a sensor-monitored, defined degree of contamination is present and when an oven cooking process is concluded and when the oven start temperature lies in a profile, which can be interrogated in the evaluating unit, of oven start temperature and heating-up time, wherein the oven start temperature is the start temperature for the pyrolytic self-cleaning process and the heating-up time is the time during which the oven is brought to a self-cleaning temperature, and wherein the evaluating unit terminates the pyrolytic self-cleaning process after a holding time of up to about 80 minutes for the pyrolytic self-cleaning process.
    2. Oven with pyrolytic self-cleaning according to claim 1, characterised in that the oven minimum start temperature amounts to 130°C.
    3. Oven with pyrolytic self-cleaning according to claim 1, characterised in that the evaluating unit corrects the heating-up time in dependence on the actual mains voltage for the oven start temperature as parameter.
    4. Oven with pyrolytic self-cleaning according to claim 1, characterised in that the holding time begins with attainment of a pyrolysing target value temperature, which depends on the analysis of degree of contamination.
    5. Oven with pyrolytic self-cleaning according to claim 1, 4, characterised in that the evaluating unit permits 480°C as maximum pyrolysing target value temperature.
    6. Oven with pyrolytic self-cleaning according to claim 1, characterised in that the evaluating unit interrupts a pyrolytic self-cleaning process, which is commanded by the user, at the latest after 20 minutes.
    EP94108227A 1993-07-01 1994-05-27 Stove having a pyrolytic self-cleaning provision Expired - Lifetime EP0632232B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4321952 1993-07-01
    DE4321952A DE4321952B4 (en) 1993-07-01 1993-07-01 Stove with pyrolytic self-cleaning

    Publications (2)

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    EP0632232A1 EP0632232A1 (en) 1995-01-04
    EP0632232B1 true EP0632232B1 (en) 1999-01-20

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    EP94108227A Expired - Lifetime EP0632232B1 (en) 1993-07-01 1994-05-27 Stove having a pyrolytic self-cleaning provision

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    AT (1) ATE176041T1 (en)
    DE (2) DE4321952B4 (en)
    ES (1) ES2130308T3 (en)

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR3035482B1 (en) 2015-04-21 2018-09-14 Groupe Brandt COOKING APPARATUS EMPLOYING A PYROLYTIC CLEANING CYCLE
    DE102020121587A1 (en) * 2020-08-18 2022-02-24 Miele & Cie. Kg Pyrolytic cleaning of a cooking appliance
    DE102021202127A1 (en) 2021-03-04 2022-09-08 BSH Hausgeräte GmbH Operating a pyrolysis-capable household cooking appliance

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2623884B1 (en) * 1987-11-27 1990-10-26 Europ Equip Menager METHOD FOR CONTROLLING THE HEATING TIME FOR A PYROLYSIS CLEANING OF A COOKING OVEN, AND COOKING OVEN IMPLEMENTING THE METHOD
    DE3924782A1 (en) * 1989-07-26 1991-01-31 Bosch Siemens Hausgeraete STOVE WITH PYROLYTIC SELF-CLEANING OF THE MUFFLE
    DE4017628A1 (en) * 1990-05-31 1991-12-05 Bosch Siemens Hausgeraete STOVE WITH PYROLYTIC SELF-CLEANING
    DE4127389A1 (en) * 1991-08-19 1993-02-25 Bosch Siemens Hausgeraete COOKER WITH SENSOR CONTROLLED PYROLYSIS
    DE4127390A1 (en) * 1991-08-19 1993-02-25 Bosch Siemens Hausgeraete AUTOMATED, PYROLYTIC SELF-CLEANING PROCESS

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    Publication number Publication date
    EP0632232A1 (en) 1995-01-04
    DE4321952B4 (en) 2004-05-27
    DE4321952A1 (en) 1995-01-12
    ES2130308T3 (en) 1999-07-01
    DE59407676D1 (en) 1999-03-04
    ATE176041T1 (en) 1999-02-15

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