EP1162402B1 - Method for monitoring the operation of a steam generator for cooking apparatus - Google Patents
Method for monitoring the operation of a steam generator for cooking apparatus Download PDFInfo
- Publication number
- EP1162402B1 EP1162402B1 EP01113934A EP01113934A EP1162402B1 EP 1162402 B1 EP1162402 B1 EP 1162402B1 EP 01113934 A EP01113934 A EP 01113934A EP 01113934 A EP01113934 A EP 01113934A EP 1162402 B1 EP1162402 B1 EP 1162402B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam generator
- water
- set forth
- filling
- fresh water
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
Definitions
- the invention relates to a method for monitoring the operation of a steam generator for cooking appliances.
- Cooking appliances in particular combi steamer, in which the food to be processed by means of steam and hot air are cooked, usually have a steam generator, which provides the steam necessary for the steaming process.
- these steam generators are provided with water level monitoring devices.
- level electrodes are advantageously used, with the aid of which the fill level in the steam generator can be measured via the electrical conductivity of the water.
- US 4,792,660 shows a steam generator for air conditioning, which monitors two operating parameters based on adjustable or preset reference values.
- the result of increased mineral concentrations in the water is not only the calcification of the steam generator, but also a failure of the level monitoring in the steam generator on the basis of the electrical conductivity because of the incoming foaming, since foam is also electrically conductive.
- the level electrodes can then no longer measure the actual water level, as a distinction between foam and water through these electrodes is not possible.
- the level monitoring electrodes indicate a water level that is actually absent, causing the water level to drop below the heating surfaces, resulting in overheating of the heating surfaces. In this condition, in the absence of water, the boiling process stops, causing the foam to collapse again, and then the message about missing water often comes too late. Such a process thus leads not only to damage the steam generator and in particular its heating surfaces, but also to an interruption of the cooking process due to lack of steam production.
- the object of the invention is to provide a method by means of which the disadvantages associated with hard water, which are associated in particular with the foaming largely avoid, that is, the risk of calcification and a false indication due to foaming in conjunction with overheating Counteract heating surfaces.
- the respective target value for each operating parameter is thus determined in a new steam generator or in a carefully decalcified steam generator in the first not yet impaired operating phase and thus serves as a comparison value for later measurements during the operation of a steam generator.
- determining the target value for an undisturbed steam generator, i. in a new steam generator or in a carefully decalcified steam generator, several measurements are made to obtain an average, since certain randomness, such as power fluctuations, are ruled out.
- control variable or control variable obtained is preferably used for carrying out a water changer or a descaling process.
- Other essential operating parameters are the boiling temperature of the water in the steam generator, which varies from altitude depending on the sea level, the filling time between the specified by the level monitoring devices low and high water levels of the steam generator, the filling time to the maximum after complete emptying of the steam generator and the rate of change of temperature of the water in the steam generator for a given heat output, that is at different heat outputs.
- This list of essential operating parameters is not exhaustive, but includes only those which are preferably taken into account in carrying out the method according to the invention.
- These setpoint values measured and stored during the first start-up of a steam generator are compared with the then measured actual values in the later monitoring. The result of this comparison represents a control variable or a control variable, which then lead to the interventions described below in the operation of a steam generator.
- the safety in the operation of the steam generator is increased even with a simple configuration in that a constant period of time and an amount of water that is less than the evaporated amount of water during this period, for injecting or spraying water into the steam generator is determined. As a result, foaming and at the same time overfilling of the steam generator is avoided.
- the level measuring device in a further embodiment of the invention in determining a sufficient water level after spraying fresh water into the steam generator because of exceeding the time interval target value at least one flush comprising a drain and a Filling the steam generator with fresh water. In this way it can be determined whether the reason for the exceeding of the time interval desired value was a detergent-induced foam which can not be dissolved by spraying fresh water. The implementation of at least one rinse then leads to eliminate the detergent and thus the cause of the foaming. If there is still a deviation from the desired time interval, the level measuring device should be checked.
Landscapes
- Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cookers (AREA)
- Commercial Cooking Devices (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Überwachen des Betriebes eines Dampferzeugers für Gargeräte.The invention relates to a method for monitoring the operation of a steam generator for cooking appliances.
Gargeräte, insbesondere Heißluftdämpfern, bei denen die aufzubereitenden Speisen mittels Dampf und Heißluft gegart werden, weisen in der Regel einen Dampferzeuger auf, der den für den Dämpfvorgang notwendigen Dampf liefert.Cooking appliances, in particular combi steamer, in which the food to be processed by means of steam and hot air are cooked, usually have a steam generator, which provides the steam necessary for the steaming process.
Damit für eine kontinuierliche Dampferzeugung immer genügend Wasser vorhanden ist und die Heizflächen des Dampferzeugers nicht trocken erhitzt werden, was zum Auslösen eines Sicherheitstemperaturbegrenzers oder zum vorzeitigen Verschleiß der Heizkörper führen würde, sind diese Dampferzeuger mit Wasserfüllstandsüberwachungseinrichtungen versehen. In vorteilhafter Weise werden hierbei Füllstandselektroden eingesetzt, mit deren Hilfe über die elektrische Leitfähigkeit des Wassers der Füllstand im Dampferzeuger gemessen werden kann.So that there is always enough water for continuous steam generation and the heating surfaces of the steam generator are not heated dry, which would lead to the triggering of a safety temperature limiter or premature wear of the radiator, these steam generators are provided with water level monitoring devices. In this case, level electrodes are advantageously used, with the aid of which the fill level in the steam generator can be measured via the electrical conductivity of the water.
Beim Betrieb solcher Dampferzeuger bereitet hartes und somit mineralhaltiges Wasser Probleme, die nicht nur zu Beeinträchtigungen und kurzzeitigen Störungen, sondern auch zu einem vollständigen Ausfall des Dampferzeugers führen können.When operating such steam generator prepares hard and thus mineral-containing water problems that can lead not only to impairments and short-term disturbances, but also to a complete failure of the steam generator.
Bei der Erwärmung von Wasser über 60°C fallen die gelösten Mineralien aus und können besonders bei Vorhandensein von Kalzium und Magnesium zu einem harten Kalkbelag führen. Diese Verkalkung führt zu einer Verminderung des Wärmeübergangs zwischen der Heizfläche und dem eingefüllten Wasser, was zu einer Überhitzung der Heizflächen führen kann. Weiterhin kann die Verkalkung im Dampferzeuger zu einer Verstopfung von Zu- und Abläufen führen, insbesondere durch von den Heizflächen sich ablösende Kalkteile.When water is heated above 60 ° C, the dissolved minerals precipitate and, especially in the presence of calcium and magnesium, can lead to a hard limescale. This calcification leads to a reduction in the heat transfer between the heating surface and the filled water, which can lead to overheating of the heating surfaces. Furthermore, the calcification in the steam generator can lead to a blockage of inflows and outflows, in particular by from the heating surfaces peeling lumps.
Aus der EP 0 383 327 A1 ist ein Dampferzeuger für Gargeräte mit einer Entkalkungseinrichtung bekannt, bei welcher in einstellbaren Intervallen in Abhängigkeit von der Betriebsdauer und/oder der Temperatur der Heizeinrichtung automatisch eine Durchspülung des Dampferzeugers und damit eine Abführung von am Boden des Dampferzeugers sich ansammelnden Kalkteilen erfolgt. Hierdurch können aber nur die von den Wänden oder den Heizflächen abgefallenen Kalkteile entfernt werden. Die Spülung erfolgt dabei in unmittelbarer Nähe des Bodens des Dampferzeugers, wodurch diese Sedimentteile ausgetragen werden.From EP 0 383 327 A1 a steam generator for cooking appliances with a descaling device is known, in which at adjustable intervals depending on the operating time and / or the temperature of the heater automatically rinsing of the steam generator and thus a discharge of accumulating at the bottom of the steam generator Calcium parts takes place. As a result, however, only the fallen of the walls or the heating elements lumps can be removed. The flushing takes place in the immediate vicinity of the bottom of the steam generator, whereby these sediment parts are discharged.
Die US 4,792,660 zeigt einen Dampferzeuger für Klimaanlagen, der zwei Betriebsparameter anhand einstellbarer bzw. voreingestellter Referenzwerte überwacht.US 4,792,660 shows a steam generator for air conditioning, which monitors two operating parameters based on adjustable or preset reference values.
Bei höherer Konzentration an Phosphaten, Kalzium, Magnesium, Karbonat, Sulfat und Natrium im Wasser des Dampferzeugers steigt nicht nur die Gefahr der Verkalkung, sondern auch die Neigung des Wassers beim Sieden aufzuschäumen. Eine Konzentrationserhöhung dieser Stoffe entsteht bei mineralhaltigem Wasser im Dampferzeuger zwangsläufig durch die Nachspeisung von immer wieder neuem, frischem Wasser zum Ausgleich des bereits verdampften Wassers. Das Wasser wird sichtbar trüb und beginnt ab einer bestimmten Konzentration der oben genannte Stoffe beim Sieden zu schäumen.With a higher concentration of phosphates, calcium, magnesium, carbonate, sulfate and sodium in the water of the steam generator not only increases the risk of calcification, but also increase the tendency of the water during boiling. An increase in concentration of these substances is inevitably caused by mineral water in the steam generator by the Nachspeisung of ever new, fresh water to compensate for the already evaporated water. The water becomes visibly cloudy and begins to foam on boiling above a certain concentration of the above-mentioned substances.
Die Folge erhöhter Mineralstoffkonzentrationen im Wasser ist nicht nur die Verkalkung des Dampferzeugers, sondern auch ein Versagen der Füllstandsüberwachung im Dampferzeuger auf der Basis der elektrischen Leitfähigkeit wegen der eintretenden Aufschäumung, da Schaum ebenfalls elektrisch leitfähig ist. Die Füllstandselektroden können dann nicht mehr den tatsächlichen Wasserstand messen, da eine Unterscheidung zwischen Schaum und Wasser durch diese Elektroden nicht möglich ist. Die Folge hiervon ist, daß die Füllstandsüberwachungselektroden einen Wasserstand anzeigen, der tatsächlich nicht vorhanden ist, wodurch der Wasserstand bis unter die Heizflächen absinkt, was zu einer Überhitzung der Heizflächen führt. In diesem Zustand hört dann bei Fehlen von Wasser der Siedevorgang auf, wodurch der Schaum wieder zusammenfällt, und dann die Meldung über fehlendes Wasser häufig zu spät kommt. Ein solcher Vorgang führt demgemäß nicht nur zur Schädigung des Dampferzeugers und insbesondere seiner Heizflächen, sondern auch zu einer Unterbrechung des Garvorganges wegen fehlender Dampfproduktion.The result of increased mineral concentrations in the water is not only the calcification of the steam generator, but also a failure of the level monitoring in the steam generator on the basis of the electrical conductivity because of the incoming foaming, since foam is also electrically conductive. The level electrodes can then no longer measure the actual water level, as a distinction between foam and water through these electrodes is not possible. The consequence of this is that the level monitoring electrodes indicate a water level that is actually absent, causing the water level to drop below the heating surfaces, resulting in overheating of the heating surfaces. In this condition, in the absence of water, the boiling process stops, causing the foam to collapse again, and then the message about missing water often comes too late. Such a process thus leads not only to damage the steam generator and in particular its heating surfaces, but also to an interruption of the cooking process due to lack of steam production.
Mit der weiter oben beschriebenen bekannten Einrichtung bei einem Dampferzeuger lassen sich die Probleme, die mit der Schaumbildung aufgrund eines hohen Härtegrades des Wassers zusammenhängen, nicht lösen. Diese bekannte Vorrichtung berücksichtigt somit nicht die Härte des Wassers oder den Verkalkungsgrad des Dampferzeugers, sondern entfernt nur in einstellbaren Intervallen die am Boden des Dampferzeugers sich ansammelnden, losen Kalkteile.With the known device described above in a steam generator can not solve the problems associated with the foaming due to a high degree of hardness of the water. This known device thus does not take into account the hardness of the water or the degree of calcification of the steam generator, but removes only at adjustable intervals, the loose lumps accumulating at the bottom of the steam generator.
Aufgabe der Erfindung ist es, ein Verfahren aufzuzeigen, mit dessen Hilfe die sich bei hartem Wasser ergebenden Nachteile, die insbesondere mit der Schaumbildung zusammenhängen, weitgehend zu vermeiden, das heißt, der Gefahr einer Verkalkung und einer Fehlanzeige durch Schaumbildung in Verbindung mit einer Überhitzung der Heizflächen entgegenzuwirken.The object of the invention is to provide a method by means of which the disadvantages associated with hard water, which are associated in particular with the foaming largely avoid, that is, the risk of calcification and a false indication due to foaming in conjunction with overheating Counteract heating surfaces.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Der jeweilige Soll-Wert für jeden Betriebsparameter wird also bei einem neuen Dampferzeuger oder bei einem sorgfältig entkalkten Dampferzeuger in der ersten noch nicht beeinträchtigten Betriebsphase festgestellt und dient somit als Vergleichswert bei späteren Messungen während des Betriebes eines Dampferzeugers. Bei der Feststellung des Soll-Wertes werden bei einem unbeeinträchtigten Dampferzeuger, d.h. bei einem neuen Dampferzeuger oder bei einem sorgfältig entkalkten Dampferzeuger, mehrere Messungen durchgeführt, um einen Mittelwert zu erhalten, da bestimmte Zufälligkeiten, wie Stromschwankungen, auszuschließen sind.This object is achieved by the features of claim 1. The respective target value for each operating parameter is thus determined in a new steam generator or in a carefully decalcified steam generator in the first not yet impaired operating phase and thus serves as a comparison value for later measurements during the operation of a steam generator. In determining the target value, for an undisturbed steam generator, i. in a new steam generator or in a carefully decalcified steam generator, several measurements are made to obtain an average, since certain randomness, such as power fluctuations, are ruled out.
Die erhaltene Regelgröße oder Steuergröße wird vorzugsweise für die Durchführung eines Wasserwechslers oder eines Entkalkungsvorganges herangezogen.The control variable or control variable obtained is preferably used for carrying out a water changer or a descaling process.
Ein wesentlicher Parameter ist der Zeitabstand zwischen zwei aufeinanderfolgenden Frischwasserauffüllvorgängen bei Siedetemperatur des Wassers im Dampferzeuger in Abhängigkeit von einer vorgegebenen Heizleistung. In der Praxis wird man bei verschiedenen Heizleistungen die jeweiligen Zeitabstände bei einem noch unbeeinträchtigten Dampferzeuger messen und abspeichern und so die jeweiligen Soll-Werte für einen späteren Vergleich erhalten.An important parameter is the time interval between two successive Frischwasserauffüllvorgängen at boiling temperature of the water in the steam generator in response to a given heat output. In practice, at different heat outputs, the respective time intervals will be measured and stored in a steam generator that is still undisturbed, thus obtaining the respective setpoint values for a later comparison.
Weitere wesentliche Betriebsparameter sind die Siedetemperatur des Wassers im Dampferzeuger, die von der Höhe über dem Meeresspiegel abhängt, die Fülldauer zwischen den von den Füllstandsüberwachungseinrichtungen festgelegten Niedrig- und Hochwasserständen des Dampferzeugers, die Fülldauer bis zum Höchststand nach vollständiger Entleerung des Dampferzeugers und die Temperaturänderungsgeschwindigkeit des Wassers im Dampferzeuger bei vorgegebener Heizleistung, das heißt bei jeweils verschiedenen Heizleistungen. Diese Aufzählung wesentlicher Betriebsparameter ist nicht abschließend, sondern umfaßt nur diejenigen, die bevorzugt bei der Durchführung des Verfahrens nach der Erfindung berücksichtigt werden. Diese bei der ersten Inbetriebnahme eines Dampferzeugers gemessenen und gespeicherten Soll-Werte werden bei der späteren Überwachung mit den dann gemessenen Ist-Werten verglichen. Das Ergebnis dieses Vergleichs stellt eine Regelgröße oder eine Steuergröße dar, die dann zu den nachfolgend beschriebenen Eingriffen in den Betriebsablauf eines Dampferzeugers führen.Other essential operating parameters are the boiling temperature of the water in the steam generator, which varies from altitude depending on the sea level, the filling time between the specified by the level monitoring devices low and high water levels of the steam generator, the filling time to the maximum after complete emptying of the steam generator and the rate of change of temperature of the water in the steam generator for a given heat output, that is at different heat outputs. This list of essential operating parameters is not exhaustive, but includes only those which are preferably taken into account in carrying out the method according to the invention. These setpoint values measured and stored during the first start-up of a steam generator are compared with the then measured actual values in the later monitoring. The result of this comparison represents a control variable or a control variable, which then lead to the interventions described below in the operation of a steam generator.
Wenn bei Überschreiten des Zeitabstands-Soll-Wertes für das Frischwasserauffüllen bei Siedetemperatur eine kleine Menge kalten Frischwassers in den Dampferzeuger gespritzt oder gesprüht wird, so läßt sich hierdurch ein möglicherweise gebildeter Schaum zum Zusammenfallen bringen. Liegt eine solche Schaumbildung vor und wird etwas kaltes Wasser eingesprüht, so ist nach dem Zusammenfallen des Schaumes die Füllstandsregelung des Dampferzeugers wieder in der Lage, einen eventuell vorhandenen Wassermangel zu erkennen, wodurch das fehlende Wasser nachgefüllt und eine Überhitzung der Heizflächen vermieden werden kann.If a small amount of cold fresh water is sprayed or sprayed into the steam generator when the time interval setpoint for the fresh water filling at boiling temperature is exceeded, a possibly formed foam can thereby be brought to collapse. If there is such foaming and some cold water is sprayed, then after the collapse of the foam, the level control of the steam generator is again able to detect any lack of water, whereby the lack of water refilled and overheating of the heating surfaces can be avoided.
Die Sicherheit beim Betrieb des Dampferzeugers wird auch bei einfacher Ausgestaltung dadurch erhöht, dass ein konstanter Zeitabschnitt und eine Wassermenge, die geringer ist als die verdampfte Wassermenge während dieses Zeitabschnittes, für das Einspritzen oder Einsprühen von Wasser in den Dampferzeuger festgelegt wird. Hierdurch wird eine Schaumbildung und gleichzeitig auch ein Überfüllen des Dampferzeugers vermieden.The safety in the operation of the steam generator is increased even with a simple configuration in that a constant period of time and an amount of water that is less than the evaporated amount of water during this period, for injecting or spraying water into the steam generator is determined. As a result, foaming and at the same time overfilling of the steam generator is avoided.
Stellt die Füllstandsmeßeinrichtung nach dem kurzen Einsprühen von Frischwasser keinen Mangel fest, so wird in weiterer Ausgestaltung der Erfindung bei der Feststellung einer ausreichenden Wasserfüllhöhe nach dem Einsprühen von Frischwasser in den Dampferzeuger wegen Überschreitens des Zeitabstands-Soll-Wertes mindestens eine Spülung umfassend eine Entleerung und eine Füllung des Dampferzeugers mit Frischwasser durchgeführt. Hierdurch kann festgestellt werden, ob für das Überschreiten des Zeitabstands-Soll-Wertes ein, durch Reinigungsmittel hervorgerufener Schaum, welcher sich nicht durch Einsprühen von Frischwasser auflösen lässt, die Ursache war. Die Durchführung von mindestens einer Spülung führt dann dazu, das Reinigungsmittel und damit die Ursache für die Schaumbildung zu beseitigen. Liegt dann immer noch eine Abweichung zum Zeitabstands-Soll-Wert vor, so ist die Füllstandsmeßeinrichtung zu überprüfen.If the level measuring device after the brief spraying of fresh water no shortage, then in a further embodiment of the invention in determining a sufficient water level after spraying fresh water into the steam generator because of exceeding the time interval target value at least one flush comprising a drain and a Filling the steam generator with fresh water. In this way it can be determined whether the reason for the exceeding of the time interval desired value was a detergent-induced foam which can not be dissolved by spraying fresh water. The implementation of at least one rinse then leads to eliminate the detergent and thus the cause of the foaming. If there is still a deviation from the desired time interval, the level measuring device should be checked.
Wenn eine solche Störung nicht vorliegt, wird nach Feststellen der richtigen Funktionsweise der Füllstandsüberwachungseinrichtung nach dem Einsprühen von Frischwasser mindestens eine Spülung, umfassend eine Entleerung und eine Füllung des Dampferzeugers mit Frischwasser nach Ablauf des laufenden Garprogrammes durchgeführt. Es wird also, wenn eine durch Reinigungsschaum entstandene Störung nicht vorliegt, nach dem Einsprühen von Frischwasser ein Wassermangel festgestellt, zunächst der Dampferzeuger mit Wasser aufgefüllt und angenommen, dass die Ursache für das Überschreiten des Zeitabstands-Soll-Wertes eine hohe Konzentration an Mineralien und damit aufschäumendes Wasser war. In diesem Falle wird deshalb erst nach Ablauf des Garprogrammes und Unterschreiten einer bestimmten Temperatur im Dampferzeuger eine Spülung durchgeführt, um den laufenden Garvorgang nicht zu stören, weil diese festgestellte Störung durch das Nachfüllen von Wasser behoben und damit die Gefahr einer Überhitzung der Heizflächen beseitigt wurde. Diese Maßnahme wird durchgeführt, um einer zunehmenden Erhöhung der Konzentration an Mineralien im Wasser des Dampferzeugers vorzubeugen, die Ursache für die Schaumbildung und das dadurch ausgelöste Einsprühen von einer kleinen Menge Frischwasser in den Dampferzeuger war.If such a fault is not present, after determining the correct operation of the level monitoring device after spraying fresh water at least one rinse, comprising emptying and filling the steam generator with fresh water after the end of the current cooking program is performed. Thus, if a disturbance caused by cleaning foam is not present, a lack of water is detected after the spraying of fresh water, first the steam generator is filled with water and it is assumed that the cause for exceeding the desired time interval value is a high concentration of minerals and thus foaming water was. In this case, therefore, only after the end of the cooking program and falls below a certain temperature in the steam generator a Rinsing carried out so as not to disturb the current cooking process, because this detected fault has been remedied by the refilling of water and thus the risk of overheating of the heating surfaces has been eliminated. This measure is taken to prevent an increasing increase in the concentration of minerals in the water of the steam generator, which was the cause of the foaming and the resulting initiated spraying of a small amount of fresh water in the steam generator.
Um den eingangs erläuterten Folgen, die sich aus einer hohen Wasserhärte und der Erhöhung der Konzentration an Mineralien in dem Wasser des Dampferzeugers ergeben, noch weiter vorzubeugen, ist in Weiterbildung der Erfindung vorgesehen, daß die Anzahl der Einsprühvorgänge gezählt und abgespeichert wird und daß in Abhängigkeit von dieser Anzahl je vorgebener Zeiteinheit die Notwendigkeit einer Entkalkung angezeigt und bei Nichtdurchführung die Heizung für den Dampferzeuger abgeschaltet wird.In order to further prevent the consequences explained at the outset, which result from a high water hardness and an increase in the concentration of minerals in the water of the steam generator, it is provided in a further development of the invention that the number of injection processes is counted and stored and that in dependence From this number ever given time unit, the need for a descaling displayed and when not running the heater for the steam generator is turned off.
Es ist aber auch möglich, daß die Anzahl der Einsprühvorgänge gezählt und abgespeichert wird und daß in Abhängigkeit von dieser Anzahl je vorgebener Zeiteinheit eine Entkalkung des Dampferzeugers automatisch durchgeführt wird. Hier kann insbesondere eine chemische Entkalkung durchgeführt werden, die alle Kalkablagerungen entfernt und nicht nur zu einer Entfernung der Kalksedimente am Boden des Dampferzeugers führt.But it is also possible that the number of Einsprühvorgänge is counted and stored and that a descaling of the steam generator is performed automatically depending on this number per given time unit. Here, in particular, a chemical decalcification can be carried out, which removes all calcium deposits and not only leads to a removal of lime sediments at the bottom of the steam generator.
Claims (12)
- A method of monitoring the operation of a steam generator for cooking gear wherein at least one essential operating parameter is measured at the unimpaired steam generator for operation of same and is stored as a desired value, said at least one essential operating parameter of said steam generator being measured as the actual value during operation of said steam generator, said measured actual value being compared with said desired value and wherein the result of the comparison is used as a control variable or an actuating variable for eliminating the cause of the difference or for switching off the steam generator.
- The method as set forth in claim 1, characterized in that an essential operating parameter is the time interval between two consecutive fresh water filling operations, with the water in the steam generator being at boiling temperature, as a function of a dictated thermal output.
- The method as set forth in claim 1 or 2, characterized in that an essential operating parameter is the boiling temperature of the water in the steam generator.
- The method as set forth in any one of the afore mentioned claims, characterized in that an essential operating parameter is the time needed for filling the volume between the steam generator low water level and its top water level set by the fill level monitoring devices.
- The method as set forth in any one of the afore mentioned claims, characterized in that an essential operating parameter is the time needed for filling the volume up to the highest level after the steam generator has been completely evacuated.
- The method as set forth in any one of the afore mentioned claims, characterized in that an essential operating parameter is the speed at which the water temperature changes in the steam generator at a given thermal output.
- The method as set forth in any one of the afore mentioned claims, characterized in that, if the desired time interval for filling the water level up with fresh water at boiling temperature is exceeded, a small amount of cold fresh water is injected or sprayed into the steam generator.
- The method as set forth in claim 7, characterized in that a constant time period and an amount of water that is smaller than the evaporated amount of water during this period of time are determined for injecting or spraying water into the steam generator.
- The method as set forth in claim 7 or 8, characterized in that, when the water fill level is determined to be sufficient after fresh water has been sprayed into the steam generator, flushing including evacuating and filling the steam generator with fresh water, is performed at least once although the desired time interval is exceeded.
- The method as set forth in claim 7 or 8, characterized in that, once the fill level monitoring device has been determined to operate properly after fresh water has been sprayed into the steam generator, flushing including evacuating and filling the steam generator with fresh water, is performed at least once after the running cooking program has come to an end.
- The method as set forth in any one of the claims 7 through 10, characterized in that the spraying operations are counted and their number saved and that as a function of this number for each prescribed time unit the need for decalcification is displayed and the heating system for the steam generator is switched off if no such decalcification is performed.
- The method as set forth in any one of the claims 7 through 10, characterized in that the number of spraying operations is counted and stored and that, as a result of this number for each prescribed time unit, automatic decalcification of the steam generator is performed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10028595 | 2000-06-09 | ||
| DE10028595A DE10028595B4 (en) | 2000-06-09 | 2000-06-09 | Method for monitoring the operation of a steam generator for cooking appliances |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1162402A2 EP1162402A2 (en) | 2001-12-12 |
| EP1162402A3 EP1162402A3 (en) | 2003-08-13 |
| EP1162402B1 true EP1162402B1 (en) | 2007-06-06 |
Family
ID=7645247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01113934A Expired - Lifetime EP1162402B1 (en) | 2000-06-09 | 2001-06-07 | Method for monitoring the operation of a steam generator for cooking apparatus |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1162402B1 (en) |
| AT (1) | ATE364156T1 (en) |
| DE (2) | DE10028595B4 (en) |
| ES (1) | ES2178617T3 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10259829B4 (en) * | 2002-12-19 | 2005-10-06 | Convotherm Elektrogeräte GmbH | Method for decalcifying steam generators for cooking appliances |
| US8025740B2 (en) | 2006-01-30 | 2011-09-27 | Rational Ag | Process for conducting cleaning operations in a fluid-receiving device of a foodstuff-processing apparatus, and fluid-receiving device and foodstuff-processing apparatus therefor |
| DE102006004340A1 (en) * | 2006-01-30 | 2007-08-09 | Rational Ag | Process to clean liquid food processing assembly at irregular intervals and using varying concentrations of cleaning agents |
| DE102006016757B4 (en) * | 2006-04-10 | 2016-06-23 | Rational Ag | A method of determining a characteristic size of a fluid, fluid receiving device and cooking device |
| DE202008010308U1 (en) | 2008-07-31 | 2008-11-20 | Lechmetall Landsberg Gmbh Edelstahlerzeugnisse | vent pipe |
| DE102008056324B4 (en) * | 2008-11-07 | 2016-07-07 | Rational Ag | Method for refilling a steam generator with water, steam generator therefor and cooking appliance therewith |
| CN105266576B (en) * | 2015-11-23 | 2017-05-10 | 珠海格力电器股份有限公司 | Method and device for determining boiling point temperature and electric pressure cooker |
| DE102016100195A1 (en) | 2016-01-06 | 2017-07-06 | Miele & Cie. Kg | Method for determining the hardness of water in water heating appliances, in particular in water-conducting household electrical appliances |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1652399A1 (en) * | 1967-11-15 | 1971-01-28 | Hans Maile Fabrik Fuer Gasbren | Device for heating and sticking material webs on substrates |
| GB1418994A (en) * | 1973-02-16 | 1975-12-24 | Easton Williams R H | Electrode boiler with automatic control |
| CH563000A5 (en) * | 1973-03-09 | 1975-06-13 | Plascon Ag | |
| DE2652399A1 (en) * | 1976-11-17 | 1978-05-18 | Bosch Siemens Hausgeraete | Electric coffee maker with furring up indicator - has water level measurer and timer providing indication even with small amounts of beverage |
| US4792660A (en) * | 1986-03-21 | 1988-12-20 | Carnes Company, Inc. | Humidifier controller having automatic over-current correcting means |
| FR2625794B1 (en) * | 1988-01-08 | 1990-05-04 | Bourgeois Ste Coop Production | WATER VAPOR GENERATOR FOR COOKING APPLIANCE |
| DE8901904U1 (en) * | 1989-02-17 | 1989-07-20 | Lechmetall Landsberg GmbH, 8910 Landsberg | Steam generator for cooking appliances with decalcification device |
| DE4218440A1 (en) * | 1992-06-04 | 1993-12-09 | Melitta Haushaltsprodukte | Coffee or tea machine with a descaling indicator |
| DE9214577U1 (en) * | 1992-10-28 | 1993-12-16 | Mayer, Herbert, 87700 Memmingen | Steam generator |
| DE19912444C2 (en) * | 1999-03-19 | 2001-11-29 | Rational Ag | Steam generator of a cooking device with a device for electronic calcification monitoring |
-
2000
- 2000-06-09 DE DE10028595A patent/DE10028595B4/en not_active Expired - Fee Related
-
2001
- 2001-06-07 EP EP01113934A patent/EP1162402B1/en not_active Expired - Lifetime
- 2001-06-07 DE DE50112586T patent/DE50112586D1/en not_active Expired - Lifetime
- 2001-06-07 AT AT01113934T patent/ATE364156T1/en not_active IP Right Cessation
- 2001-06-07 ES ES01113934T patent/ES2178617T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE10028595A1 (en) | 2002-01-03 |
| ES2178617T3 (en) | 2007-12-16 |
| EP1162402A3 (en) | 2003-08-13 |
| EP1162402A2 (en) | 2001-12-12 |
| ATE364156T1 (en) | 2007-06-15 |
| DE50112586D1 (en) | 2007-07-19 |
| ES2178617T1 (en) | 2003-01-01 |
| DE10028595B4 (en) | 2004-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2890279B1 (en) | Device for providing liquid for a drinks machine and use of same | |
| DE19912444C2 (en) | Steam generator of a cooking device with a device for electronic calcification monitoring | |
| DE102007048567B4 (en) | Process for cleaning a system consisting of a tank and a water heater, and system | |
| EP1166698B1 (en) | Boiler and steam cooker with such a boiler | |
| DE10259829B4 (en) | Method for decalcifying steam generators for cooking appliances | |
| EP2369227B1 (en) | Steam generation unit for a domestic appliance and method for operating same | |
| EP1162402B1 (en) | Method for monitoring the operation of a steam generator for cooking apparatus | |
| EP2842474B1 (en) | Water-bearing household device with a heating device | |
| DE102014206281A1 (en) | Operating an evaporator of a household appliance | |
| WO2007085247A2 (en) | Process for conducting cleaning operations in a fluid-receiving device of a foodstuff-processing apparatus, and fluid-receiving device and foodstuff-processing apparatus therefor | |
| EP2350529A2 (en) | Household appliance having a fillable steam boiler, and steam boiler for a household appliance | |
| DE102016124405B3 (en) | Method for determining a calcification of a cooking appliance | |
| DE102016222313B4 (en) | Method of cooking at least one egg | |
| EP4185806A1 (en) | Operating a domestic steam-treatment appliance, and domestic steam-treatment appliance | |
| WO2014095975A2 (en) | Steam generator with water level detection device | |
| DE102006016757B4 (en) | A method of determining a characteristic size of a fluid, fluid receiving device and cooking device | |
| DE102019211361B3 (en) | Method for operating a device network | |
| DE10213014A1 (en) | Commercial kitchen steam cooker has a sensing system to monitor the build-up of scale on the steam injection nozzle | |
| DE102017101078A1 (en) | Recognition device for detecting a filling level for a steam generating device of a steam ironing device and method for operating a recognition device | |
| DE102018104371A1 (en) | Steam generator for a cooking appliance, cooking appliance, method for determining a filling state of a steam generator and method for determining the calcification of a heating register in a steam generator | |
| EP2466209B1 (en) | Method for determining different reasons for the failure of a steam cooker and steam cooker | |
| DE102023201353A1 (en) | Procedure for monitoring a descaling routine in a coffee machine | |
| EP2869736B1 (en) | Device for determining a liquid level in a steam generator of a steam cooker, steam cooker having such a device, and method for determining a liquid level | |
| DE102019110381A1 (en) | Method for determining the fill level of a water tank and cooking device | |
| CH691281A5 (en) | Steam cooking device operating method has preselected cooking temperature for cooking space limited in dependence on detected boiling point of water in boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
| EL | Fr: translation of claims filed | ||
| GBC | Gb: translation of claims filed (gb section 78(7)/1977) | ||
| TCNL | Nl: translation of patent claims filed | ||
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| 17P | Request for examination filed |
Effective date: 20030730 |
|
| AKX | Designation fees paid |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| 17Q | First examination report despatched |
Effective date: 20050531 |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: RIEFENSTEIN, LUTZ Inventor name: SCHWARZBAECKER, WERNER |
|
| GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070606 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
| REF | Corresponds to: |
Ref document number: 50112586 Country of ref document: DE Date of ref document: 20070719 Kind code of ref document: P |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20070724 |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
| ET | Fr: translation filed | ||
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2178617 Country of ref document: ES Kind code of ref document: T3 |
|
| BERE | Be: lapsed |
Owner name: CONVOTHERM-ELEKTROGERATE G.M.B.H. Effective date: 20070630 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071106 Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070606 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070606 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070907 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 |
|
| 26N | No opposition filed |
Effective date: 20080307 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070607 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20080618 Year of fee payment: 8 Ref country code: SE Payment date: 20080612 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20080620 Year of fee payment: 8 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070606 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070607 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070606 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20090607 |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20100101 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090607 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100101 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090608 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20120705 Year of fee payment: 12 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20120626 Year of fee payment: 12 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20140228 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130701 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20140707 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130608 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 50112586 Country of ref document: DE Representative=s name: HOEFER & PARTNER PATENTANWAELTE MBB, DE |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20180621 Year of fee payment: 18 Ref country code: DE Payment date: 20180627 Year of fee payment: 18 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50112586 Country of ref document: DE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190607 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200101 |