EP1162402B1 - Procédé de surveillance du fonctionnement d'un générateur de vapeur pour appareil de cuisson - Google Patents

Procédé de surveillance du fonctionnement d'un générateur de vapeur pour appareil de cuisson Download PDF

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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
Application number
EP01113934A
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German (de)
English (en)
Other versions
EP1162402A3 (fr
EP1162402A2 (fr
Inventor
Lutz Riefenstein
Werner SCHWARZBÄCKER
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.)
Welbilt Deutschland GmbH
Original Assignee
Convotherm Elektrogeraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Convotherm Elektrogeraete GmbH filed Critical Convotherm Elektrogeraete GmbH
Publication of EP1162402A2 publication Critical patent/EP1162402A2/fr
Publication of EP1162402A3 publication Critical patent/EP1162402A3/fr
Application granted granted Critical
Publication of EP1162402B1 publication Critical patent/EP1162402B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
  • Testing And Monitoring For Control Systems (AREA)
  • Commercial Cooking Devices (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Claims (12)

  1. Procédé de surveillance du fonctionnement d'un générateur de vapeur pour appareils de cuisson dans lequel, pour le fonctionnement du générateur de vapeur, au moins un paramètre de fonctionnement essentiel est mesuré au générateur de vapeur intact et est mis en mémoire comme valeur nominale, l'au moins un paramètre de fonctionnement essentiel du générateur de vapeur étant mesuré en tant que valeur réelle pendant le fonctionnement de ce générateur de vapeur, cette valeur réelle étant comparée avec la valeur nominale, et le résultat de cette comparaison étant utilisé comme grandeur de réglage ou grandeur pilote pour éliminer la cause de la différence ou pour éteindre le générateur de vapeur.
  2. Procédé selon la revendication 1, caractérisé en ce qu'un paramètre de fonctionnement essentiel est l'intervalle de temps entre deux opérations consécutives de remplissage en eau fraîche, l'eau dans le générateur de vapeur étant à la température d'ébullition, en fonction d'une puissance de chauffage imposée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'un paramètre de fonctionnement essentiel est la température d'ébullition de l'eau dans le générateur de vapeur.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un paramètre de fonctionnement essentiel est la durée de remplissage du volume entre le bas niveau d'eau et le haut niveau d'eau du générateur de vapeur fixés par les dispositifs de surveillance du niveau.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un paramètre de fonctionnement essentiel est la durée de remplissage jusqu'à ce que le niveau maximum soit atteint une fois que le générateur de vapeur a été entièrement évacué.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un paramètre de fonctionnement essentiel est la vitesse à laquelle la température de l'eau dans le générateur de vapeur change à puissance de chauffe imposée.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, en cas de dépassement de la valeur nominale pour l'intervalle de temps nécessaire à faire l'appoint d'eau fraîche à la température d'ébullition, on injecte ou pulvérise une petite quantité d'eau fraîche dans le générateur de vapeur.
  8. Procédé selon la revendication 7, caractérisé en ce qu'un laps de temps constant et une quantité d'eau inférieure à la quantité d'eau évaporée pendant ce laps de temps sont fixés pour injecter ou pulvériser de l'eau dans le générateur de vapeur.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que, lorsqu'un niveau d'eau suffisant a été constaté après pulvérisation d'eau fraîche dans le générateur de vapeur, on procède à au moins un rinçage comprenant une évacuation et un remplissage du générateur de vapeur en eau fraîche malgré dépassement de la valeur nominale pour l'intervalle de temps.
  10. Procédé selon la revendication 7 ou 8, caractérisé en ce que, après que le bon fonctionnement du dispositif de surveillance du niveau a été constaté après pulvérisation d'eau fraîche dans le générateur de vapeur, on procède à au moins un rinçage comprenant une évacuation et un remplissage du générateur de vapeur en eau fraîche une fois que le programme de cuisson en cours est terminé.
  11. Procédé selon l'une quelconque des revendications 7 à 10, caractérisé en ce que les opérations de pulvérisation sont comptées et que leur nombre est mis en mémoire et que la nécessité de procéder à un détartrage est affichée en fonction de ce nombre par unité de temps imposée et que le chauffage du générateur est mis hors circuit au cas où un tel détartrage n'est pas effectué.
  12. Procédé selon l'une quelconque des revendications 7 à 10, caractérisé en ce que les opérations de pulvérisation sont comptées et que leur nombre est mis en mémoire et qu'un détartrage automatique du générateur de vapeur est effectué en fonction de ce nombre par unité de temps imposée.
EP01113934A 2000-06-09 2001-06-07 Procédé de surveillance du fonctionnement d'un générateur de vapeur pour appareil de cuisson Expired - Lifetime EP1162402B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10028595A DE10028595B4 (de) 2000-06-09 2000-06-09 Verfahren zum Überwachen des Betriebes eines Dampferzeugers für Gargeräte
DE10028595 2000-06-09

Publications (3)

Publication Number Publication Date
EP1162402A2 EP1162402A2 (fr) 2001-12-12
EP1162402A3 EP1162402A3 (fr) 2003-08-13
EP1162402B1 true EP1162402B1 (fr) 2007-06-06

Family

ID=7645247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01113934A Expired - Lifetime EP1162402B1 (fr) 2000-06-09 2001-06-07 Procédé de surveillance du fonctionnement d'un générateur de vapeur pour appareil de cuisson

Country Status (4)

Country Link
EP (1) EP1162402B1 (fr)
AT (1) ATE364156T1 (fr)
DE (2) DE10028595B4 (fr)
ES (1) ES2178617T3 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259829B4 (de) * 2002-12-19 2005-10-06 Convotherm Elektrogeräte GmbH Verfahren zum Entkalken von Dampferzeugern für Gargeräte
BRPI0707311A2 (pt) 2006-01-30 2011-05-03 Rational Ag processo para condução de operações de limpeza em um dispositivo de alojamento de fluido de um aparelho de tratamento de alimentos bem como dispositivo de alojamento de fluido e aparelho de tratamento de alimentos correspondente
DE102006016757B4 (de) * 2006-04-10 2016-06-23 Rational Ag Verfahren zur Bestimmung einer charakteristischen Größe eines Fluids, Fluidaufnahmevorrichtung und Gargerät
DE102006004340A1 (de) * 2006-01-30 2007-08-09 Rational Ag Verfahren und Vorrichtung zur Erkennung einer Verkalkung eines Behälters, insbesondere eines Gargeräts
DE202008010308U1 (de) 2008-07-31 2008-11-20 Lechmetall Landsberg Gmbh Edelstahlerzeugnisse Entlüftungsrohr
DE102008056324B4 (de) * 2008-11-07 2016-07-07 Rational Ag Verfahren zur Nachbefüllung eines Dampfgenerators mit Wasser, Dampfgenerator dafür und Gargerät damit
CN105266576B (zh) * 2015-11-23 2017-05-10 珠海格力电器股份有限公司 一种确定沸点温度的方法、装置及电压力锅
DE102016100195A1 (de) 2016-01-06 2017-07-06 Miele & Cie. Kg Verfahren zur Härtebestimmung von Wasser in Wassererhitzungsgeräten, insbesondere in wasserführenden elektrischen Hausgeräten

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652399A1 (de) * 1967-11-15 1971-01-28 Hans Maile Fabrik Fuer Gasbren Vorrichtung zum Erwaermen und Aufkleben von Materialbahnen auf Unterlagen
GB1418994A (en) * 1973-02-16 1975-12-24 Easton Williams R H Electrode boiler with automatic control
CH563000A5 (fr) * 1973-03-09 1975-06-13 Plascon Ag
DE2652399A1 (de) * 1976-11-17 1978-05-18 Bosch Siemens Hausgeraete Elektrische kaffeemaschine
US4792660A (en) * 1986-03-21 1988-12-20 Carnes Company, Inc. Humidifier controller having automatic over-current correcting means
FR2625794B1 (fr) * 1988-01-08 1990-05-04 Bourgeois Ste Coop Production Generateur de vapeur d'eau pour appareil de cuisson
DE8901904U1 (de) * 1989-02-17 1989-07-20 Lechmetall Landsberg GmbH, 8910 Landsberg Dampferzeuger für Gargeräte mit Entkalkungseinrichtung
DE4218440A1 (de) * 1992-06-04 1993-12-09 Melitta Haushaltsprodukte Kaffee- oder Teemaschine mit einer Entkalkungsanzeigevorrichtung
DE9214577U1 (de) * 1992-10-28 1993-12-16 Mayer, Herbert, 87700 Memmingen Dampferzeuger
DE19912444C2 (de) * 1999-03-19 2001-11-29 Rational Ag Dampfgenerator eines Gargerätes mit einer Vorrichtung zur elektronischen Verkalkungsüberwachung

Also Published As

Publication number Publication date
EP1162402A3 (fr) 2003-08-13
ATE364156T1 (de) 2007-06-15
DE50112586D1 (de) 2007-07-19
DE10028595B4 (de) 2004-05-13
ES2178617T3 (es) 2007-12-16
EP1162402A2 (fr) 2001-12-12
ES2178617T1 (es) 2003-01-01
DE10028595A1 (de) 2002-01-03

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