EP0429034A2 - Method for controlling a heater - Google Patents

Method for controlling a heater Download PDF

Info

Publication number
EP0429034A2
EP0429034A2 EP90122065A EP90122065A EP0429034A2 EP 0429034 A2 EP0429034 A2 EP 0429034A2 EP 90122065 A EP90122065 A EP 90122065A EP 90122065 A EP90122065 A EP 90122065A EP 0429034 A2 EP0429034 A2 EP 0429034A2
Authority
EP
European Patent Office
Prior art keywords
housing
burner
interior
heater
chamber
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.)
Granted
Application number
EP90122065A
Other languages
German (de)
French (fr)
Other versions
EP0429034A3 (en
EP0429034B1 (en
Inventor
Paul Heimbach
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.)
N.V. VAILLANT S.A.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
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
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd filed Critical Vaillant Austria GmbH
Publication of EP0429034A2 publication Critical patent/EP0429034A2/en
Publication of EP0429034A3 publication Critical patent/EP0429034A3/en
Application granted granted Critical
Publication of EP0429034B1 publication Critical patent/EP0429034B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/12—Measuring temperature room temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/13—Measuring temperature outdoor temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/19—Measuring temperature outlet temperature water heat-exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/06—Space-heating and heating water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the invention relates to a method for controlling a heating device with a premix gas burner, which chamber, together with a heat exchanger, is arranged in a housing of the heating device which is sealed off from the environment and sealed with the exception of an air supply line, and which chamber is sealed relative to the latter is connected to an exhaust gas line, the burner being acted upon by a controllable gas throughput actuator and the speed of a fan supplying the burner from the interior of the housing can be controlled in terms of its speed depending on the gas throughput and the air supply line opens into an air chamber arranged in the interior of the housing, which is connected to the interior of the housing via an actuator.
  • the control of such heaters takes place in such a way that the application of gas and air to the burner is adapted to the respective heat requirement.
  • the mixing ratio of the two mixture components which is described by the air ratio, should be only slightly above the stoichiometric value and should be approximately constant or correspond to a value adapted to the respective thermal load.
  • the aim of the invention is to avoid these disadvantages.
  • this is achieved in that, when the burner output is reduced, the flow resistance of the air flowing into the interior of the housing is increased in a predetermined manner by adjusting the actuator between the air chamber and the interior of the housing and is also reduced when the burner output is increased.
  • the return to the target value is then identical to the return of the detuning to zero. It is achieved in that when the burner output is reduced in comparison to the out of tune state, an additional resistance is generated in the air supply to the interior of the fan, and vice versa when the burner output increases.
  • the prerequisite is a clear link between burner output, fan speed and pressure curve. Exceeding the setting range on the actuator can be used to switch off the burner.
  • Another object of the invention is to propose a heater for carrying out the method according to the invention.
  • a heater for carrying out the method according to the invention with a premix gas burner which, together with a heat exchanger, is arranged in a housing of the heater which is arranged in the interior of the heater and is sealed with respect to the environment, with the exception of an air supply line, and which chamber is sealed with respect to this, which chamber with an exhaust gas line is connected, wherein the burner is acted upon by a controllable gas flow actuator and the speed of a fan supplying the burner from the interior of the housing can be controlled depending on the gas flow and the air supply line opens into an air chamber arranged in the interior of the housing, which via a Actuator is connected to the interior of the housing, it is therefore proposed that the gas flow actuator and the blower motor respond to electrical signals from a control device that controls the coupling of gas and air flow according to predetermined target values.
  • the air chamber is connected to the interior of the housing by an actuator which is controlled directly or indirectly by the pressure difference between the two spaces, the actuator being preferably formed by a diaphragm valve.
  • the actuator being preferably formed by a diaphragm valve.
  • the actuator is equipped with limit switches for switching off the burner, thereby simply switching off the burner It can also be ensured if the actuating range of the actuator is no longer sufficient to return to the intended target value.
  • the heater according to the invention has a sealed housing 20, in the interior 19 of which a sealed chamber 7 is arranged, in which the burner 6 and a heat exchanger 8 are arranged.
  • This chamber 7 is connected via the exhaust line 12 to an exhaust duct or an outlet opening.
  • This exhaust line 12 is surrounded by an air supply line 9, which opens into the interior of the sealed housing 20 and is arranged coaxially with the exhaust line 12.
  • a monitoring electrode 14 for monitoring the burner function and an ignition electrode 13 also protrude into the chamber 7, into which the outlet of a blower 1 also opens, which sucks in air from the interior of the housing and conveys it into the chamber 7, in which an overpressure builds up, which is due to the resistance that the heat exchanger 8 opposes to the outflow of the exhaust gases.
  • a gas nozzle 5 opens into the suction opening 21 of the blower 1 and is acted upon by a gas actuator 4 which is adjustable via electrical signals and which is arranged in a gas line 3.
  • a flow temperature sensor 15 is arranged, which is connected to the control unit 18, which is also arranged in the housing 20, to which the gas flow rate control element 4 and the blower 1 are also connected, and to which control signals are applied.
  • an air chamber 10 is provided, into which the air supply pipe 9 opens directly and which is connected to the interior 19 of the housing 20, for example via a diaphragm control valve.
  • control unit 18 processes the signals coming alternatively from a room thermostat (not shown) and an outside temperature sensor or the signals coming from a heating water temperature sensor and a hot water temperature sensor for controlling the burner.
  • the gas control valve 4 and the blower 1 are activated, the activation of these two elements taking place in accordance with the operating characteristic of the heater, which is shown in FIG. 4 for example and will be explained in more detail later.
  • a housing pressure sensor (not shown) can be provided in the interior 19 of the housing 20, which is connected to a comparator arranged in the control device 19, which correspondingly varies an air control valve which, like the diaphragm control valve 11 shown in FIG. 1, varies the inflow resistance of the air controls.
  • Figure 3 shows the pressure curve in the heater, from which it can be seen that there is an overpressure on the exhaust side and a negative pressure on the air side.
  • the performance of the burner 6 is essentially dependent on the delivery head of the blower 1, it being assumed that an amount of gas substantially corresponding to the stoichiometric ratio is added to the air supplied to the burner 6.
  • the nominal load point A of the blower 1 corresponds to the intersection of the resistance characteristic AC of the heater with the blower characteristic U 1, n 1 defined by the supply voltage U 1 and the speed n 1 of the blower.
  • the resistance characteristic of the heater can be shifted towards larger delivery heights of the blower, with the exception of the nominal output point A. This shift results from the requirement that at a
  • the correction element x is to be determined as a function of the desired negative pressure in the housing in such a way that the fan characteristic curve (U x , n x ) passing through point D is achieved.
  • the blower operating point must be shifted from point E to point D on the blower characteristic curve U x , n x which is controlled for the new load state. This is accomplished by increasing the resistance of the air actuator 11 that controls the passage between the air chamber 10 and the interior 19 of the housing 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • General Induction Heating (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Resistance Heating (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

Method for controlling a heater with a premix gas burner which is mounted together with a heat exchanger in a chamber which is arranged inside the housing, which is sealed in relation to the surroundings with the exception of an air supply pipe, of the heater and is sealed in relation to the latter, which chamber is connected to a waste gas pipe, the burner being acted upon via a controllable gas throughput control member and a blower, which supplies the burner and draws in from the interior of the housing, being controllable in its speed depending upon the gas throughput, and the air supply pipe opening into an air chamber arranged inside the housing, which chamber is connected to the interior of the housing via a control member. In order to make possible optimum adjustment of the burner in the part-load range also, it is envisaged that, upon reduction of the burner output, the flow resistance of the air flowing into the interior of the housing is increased in a predetermined manner by adjustment of the control member between air chamber and housing interior and, upon raising the burner output, it is likewise reduced.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Steue­rung eines Heizgerätes mit einem Vormisch-Gasbrenner, der samt einem Wärmetauscher in einer im Inneren des gegen­über der Umgebung, mit Ausnahme einer Luftzuführleitung, abgedichteten Gehäuses des Heizgerätes angeordneten und gegenüber diesem abgedichteten Kammer montiert ist, wel­che Kammer mit einer Abgasleitung verbunden ist, wobei der Brenner über ein regelbares Gasdurchsatz-Stellglied beaufschlagt und ein den Brenner versorgendes, aus dem Inneren des Gehäuses ansaugendes Gebläse in seiner Dreh­zahl abhängig vom Gasdurchsatz steuerbar ist und die Luftzuführleitung in eine im Inneren des Gehäuses ange­ordnete Luftkammer mündet, die über ein Stellorgan mit dem Inneren des Gehäuses verbunden ist.The invention relates to a method for controlling a heating device with a premix gas burner, which chamber, together with a heat exchanger, is arranged in a housing of the heating device which is sealed off from the environment and sealed with the exception of an air supply line, and which chamber is sealed relative to the latter is connected to an exhaust gas line, the burner being acted upon by a controllable gas throughput actuator and the speed of a fan supplying the burner from the interior of the housing can be controlled in terms of its speed depending on the gas throughput and the air supply line opens into an air chamber arranged in the interior of the housing, which is connected to the interior of the housing via an actuator.

Bei solchen Heizgeräten ist es erforderlich, rund um die den Brenner enthaltende Kammer, in der sich aufgrund des Widerstandes, den der Wärmetauscher dem Abströmen der Ab­gase entgegensetzt, ein Überdruck herrscht, einen Bereich vorzusehen, in dem ein Unterdruck herrscht, um im Falle einer Leckage der Kammer ein Austreten der Abgase in den Raum, in dem ein solches Heizgerät aufgestellt ist, zu verhindern.In such heaters, it is necessary to provide an area around the chamber containing the burner, in which there is an overpressure due to the resistance of the heat exchanger to the outflow of the exhaust gases, in which a negative pressure prevails in order to prevent leakage the chamber to prevent the exhaust gases from escaping into the room in which such a heater is installed.

Die Regelung solcher Heizgeräte erfolgt in der Weise, daß die Beaufschlagung des Brenners mit Gas und Luft dem je­weiligen Wärmebedarf angepaßt wird. Das Mischungsverhält­nis beider Gemischkomponenten, das durch die Luftzahl beschrieben wird, soll dabei nur wenig über dem stöchio­metrischen Wert liegen und näherungsweise konstant sein beziehungsweise einem auf die jeweilige Wärmebelastung abgestimmten Wert entsprechen.The control of such heaters takes place in such a way that the application of gas and air to the burner is adapted to the respective heat requirement. The mixing ratio of the two mixture components, which is described by the air ratio, should be only slightly above the stoichiometric value and should be approximately constant or correspond to a value adapted to the respective thermal load.

Zur Sicherung des optimalen Betriebes, aber auch aus sicherheits- und regelungstechnischen Gründen ist eine laufende Überwachung des Ist-Wertes der Luftzahl erfor­derlich. Sie soll bei Abweichungen durch Korrektur der Gas- und beziehungsweise oder Luftdosierung eine Rückfüh­rung auf den Soll-Wert bewirken oder, wo das nicht mög­lich ist, den Brenner abschalten. Zur Anzeige des Ist­Zustandes werden Sensoren zur Messung des Sauerstoffan­ teiles im Rauchgas, der Brennraumtemperatur oder der Ge­schwindigkeit im Ansaugstutzen verwendet. Nachteilig da­bei sind vergleichsweise hohe Kosten und beziehungsweise oder die erhebliche Gefährdung der Funktion durch thermi­sche und korrosive Belastungen.To ensure optimal operation, but also for safety and control reasons, continuous monitoring of the actual value of the air ratio is required. In the event of deviations by correcting the gas and / or air metering, it should result in a return to the target value or, if this is not possible, switch off the burner. Sensors for measuring the oxygen are used to display the actual status partly used in the flue gas, the combustion chamber temperature or the speed in the intake manifold. The disadvantages here are comparatively high costs and / or the considerable risk to the function from thermal and corrosive loads.

Ziel der Erfindung ist es, diese Nachteile zu vermeiden.The aim of the invention is to avoid these disadvantages.

Erfindungsgemäß wird dies dadurch erreicht, daß bei ei­ner Verminderung der Brennerleistung der Strömungswider­stand der in das Innere des Gehäuses zuströmenden Luft durch Verstellung des Stellgliedes zwischen Luftkammer und Gehäuseinnerem in vorgegebener Weise vergrößert und bei Anhebung der Brennerleistung ebenso verkleinert wird.According to the invention this is achieved in that, when the burner output is reduced, the flow resistance of the air flowing into the interior of the housing is increased in a predetermined manner by adjusting the actuator between the air chamber and the interior of the housing and is also reduced when the burner output is increased.

Dies ermöglicht es, bei allen Änderungen der Brennerlei­stung den Innendruck im Gehäuse konstant zu halten. Dabei wird von der Tatsache Gebrauch gemacht, daß bei der mit der Verringerung der Brennerleistung verbundenen Reduzie­rung des vom Gebläse geförderten Gemischvolumenstromes durch Konstanthaltung eines Teilbetrages der Summe aller Strömungswiderstände eine Verstimmung der Gebläsekennli­nie.This makes it possible to keep the internal pressure in the housing constant with all changes in the burner output. Use is made of the fact that in the reduction of the burner output associated with the reduction in the mixture volume flow conveyed by the blower by keeping a partial amount of the sum of all flow resistances, the blower characteristic curve is detuned.

Die Rückführung auf den Soll-Wert ist dann identisch mit der Rückführung der Verstimmung gegen Null. Sie wird da­durch erreicht, daß bei Verkleinerung der Brennerleistung im Vergleich zum verstimmten Zustand ein zusätzlicher Wi­derstand in der Luftzuführung zum Gebläseinneren erzeugt wird, bei Steigerung der Brennerleistung entsprechend umgekehrt. Voraussetzung ist die eindeutige Verknüpfung von Brennerleistung, Gebläsedrehzahl und Druckverlauf. Die Überschreitung des Stellbereiches am Stellglied kann zum Ausschalten des Brenners benutzt werden.The return to the target value is then identical to the return of the detuning to zero. It is achieved in that when the burner output is reduced in comparison to the out of tune state, an additional resistance is generated in the air supply to the interior of the fan, and vice versa when the burner output increases. The prerequisite is a clear link between burner output, fan speed and pressure curve. Exceeding the setting range on the actuator can be used to switch off the burner.

Ein weiteres Ziel der Erfindung ist es, ein Heizgerät zur Durchführung des erfindungsgemäßen Verfahrens vorzuschla­gen.Another object of the invention is to propose a heater for carrying out the method according to the invention.

Bei einem Heizgerät zur Durchführung des erfindungsgemä­ßen Verfahrens mit einem Vormisch-Gasbrenner, der samt einem Wärmetauscher in einer im Inneren des gegenüber der Umgebung, mit Ausnahme einer Luftzuführleitung, abge­dichteten Gehäuses des Heizgerätes angeordneten und ge­genüber diesem abgedichteten Kammer montiert ist, welche Kammer mit einer Abgasleitung verbunden ist, wobei der Brenner über ein regelbares Gasdurchsatz-Stellglied be­aufschlagt und ein den Brenner versorgendes, aus dem In­neren des Gehäuses ansaugendes Gebläse in seiner Drehzahl abhängig vom Gasdurchsatz steuerbar ist und die Luftzu­führleitung in eine im Inneren des Gehäuses angeordnete Luftkammer mündet, die über ein Stellorgan mit dem Inne­ren des Gehäuses verbunden ist, wird daher vorgeschlagen, daß das Gasdurchsatz-Stellglied und der Gebläsemotor auf elektrische Signale aus einem Steuergerät ansprechen, das die Koppelung von Gas- und Luftstrom nach vorgegebenen Soll-Werten steuert.In a heater for carrying out the method according to the invention with a premix gas burner which, together with a heat exchanger, is arranged in a housing of the heater which is arranged in the interior of the heater and is sealed with respect to the environment, with the exception of an air supply line, and which chamber is sealed with respect to this, which chamber with an exhaust gas line is connected, wherein the burner is acted upon by a controllable gas flow actuator and the speed of a fan supplying the burner from the interior of the housing can be controlled depending on the gas flow and the air supply line opens into an air chamber arranged in the interior of the housing, which via a Actuator is connected to the interior of the housing, it is therefore proposed that the gas flow actuator and the blower motor respond to electrical signals from a control device that controls the coupling of gas and air flow according to predetermined target values.

Durch diese Maßnahmen ist es möglich, das Heizgerät auch im Teillastbereich optimal zu betreiben und einerseits den Brenner in dem geplanten Umfang mit Gas und Luft zu beaufschlagen, andererseits bei Grenzüberschreitung Risi­ken zu vermeiden. Dabei ist es auch möglich, auf eigene Sensoren zu verzichten. Es genügt, die notwendigen Para­meter entsprechend deren gegebenen Zusammenhang zu ändern.These measures make it possible to operate the heater optimally even in the partial load range and, on the one hand, to charge the burner with gas and air to the planned extent, and on the other hand to avoid risks when the limit is exceeded. It is also possible to do without your own sensors. It is sufficient to change the necessary parameters according to their given context.

Weiter kann vorgesehen sein, daß die Luftkammer mit dem Inneren des Gehäuses durch ein Stellglied verbunden ist, das direkt oder indirekt durch die Druckdifferenz zwi­schen beiden Räumen gesteuert ist, wobei das Stellglied vorzugsweise durch ein Membranventil gebildet ist. In diesem Fall ergibt sich ein besonders einfacher Aufbau einer Konstantdrucksteuerung, ohne daß es dazu einer Elektronik oder eigener Sensoren bedarf.It can further be provided that the air chamber is connected to the interior of the housing by an actuator which is controlled directly or indirectly by the pressure difference between the two spaces, the actuator being preferably formed by a diaphragm valve. In this case, a particularly simple construction of a constant pressure control results without the need for electronics or separate sensors.

Weiter kann vorgesehen sein, daß das Stellglied mit Grenzwertgebern zum Abschalten des Brenners ausgestattet ist, wodurch auf einfache Weise ein Abschalten des Bren­ ners sichergestellt werden kann, wenn der Stellbereich des Stellgliedes nicht mehr für eine Rückführung auf den vorgesehenen Soll-Wert ausreicht.It can also be provided that the actuator is equipped with limit switches for switching off the burner, thereby simply switching off the burner It can also be ensured if the actuating range of the actuator is no longer sufficient to return to the intended target value.

Die Erfindung wird nun anhand der Zeichnung näher erläu­tert.
The invention will now be explained in more detail with reference to the drawing.

Dabei zeigen:

  • Figur 1 schematisch ein erfindungsgemäßes Heizgerät,
  • Figur 2 ein Steuerschema für das Gerät nach der Figur 1,
  • Figur 3 ein Diagramm der Druckverhältnisse im Heizgerät nach der Figur 1 und
  • Figur 4 ein Belastungsdiagramm des Gerätes nach Figur 1.
Show:
  • FIG. 1 schematically shows a heating device according to the invention,
  • FIG. 2 shows a control diagram for the device according to FIG. 1,
  • Figure 3 is a diagram of the pressure conditions in the heater of Figures 1 and
  • FIG. 4 shows a load diagram of the device according to FIG. 1.

Das erfindungsgemäße Heizgerät weist ein dichtes Gehäuse 20 auf, in dessen Innenraum 19 eine dichte Kammer 7 ange­ordnet ist, in der der Brenner 6 und ein Wärmetauscher 8 angeordnet sind.The heater according to the invention has a sealed housing 20, in the interior 19 of which a sealed chamber 7 is arranged, in which the burner 6 and a heat exchanger 8 are arranged.

Diese Kammer 7 ist über die Abgasleitung 12 mit einem Ab­gasschacht oder einer Auslaßöffnung verbunden. Diese Ab­gasleitung 12 ist von einer Luftzuführleitung 9 umgeben, die in das Innere des dichten Gehäuses 20 mündet und zur Abgasleitung 12 koaxial angeordnet ist.This chamber 7 is connected via the exhaust line 12 to an exhaust duct or an outlet opening. This exhaust line 12 is surrounded by an air supply line 9, which opens into the interior of the sealed housing 20 and is arranged coaxially with the exhaust line 12.

Weiter ragen eine Überwachungselektrode 14 zur Überwa­chung der Brennerfunktion und eine Zündelektrode 13 in die Kammer 7, in die auch der Ausgang eines Gebläses 1 mündet, das Luft aus dem Innenraum des Gehäuses ansaugt und in die Kammer 7 fördert, in der sich ein Überdruck aufbaut, der durch den Widerstand bedingt ist, den der Wärmetauscher 8 dem Abströmen der Abgase entgegensetzt.A monitoring electrode 14 for monitoring the burner function and an ignition electrode 13 also protrude into the chamber 7, into which the outlet of a blower 1 also opens, which sucks in air from the interior of the housing and conveys it into the chamber 7, in which an overpressure builds up, which is due to the resistance that the heat exchanger 8 opposes to the outflow of the exhaust gases.

Da bei dem dargestellten Ausführungsbeispiel ein Vormisch-­Gasbrenner 6 vorgesehen ist, mündet in die Ansaugöffnung 21 des Gebläses 1 eine Gasdüse 5, die über ein über elek­trische Signale verstellbares Gasstellglied 4, das in einer Gasleitung 3 angeordnet ist, beaufschlagt ist.Since a premixing gas burner 6 is provided in the exemplary embodiment shown, a gas nozzle 5 opens into the suction opening 21 of the blower 1 and is acted upon by a gas actuator 4 which is adjustable via electrical signals and which is arranged in a gas line 3.

An dem Heizwasservorlauf 16 des Wärmetauschers 8 ist ein Vorlauftemperatursensor 15 angeordnet, der mit dem eben­falls im Gehäuse 20 angeordneten Steuergerät 18 verbunden ist, an dem auch das Gasdurchsatz-Stellglied 4 und das Gebläse 1 angeschlossen sind, und von diesem mit Steuer­signaien beaufschlagt werden.On the heating water flow 16 of the heat exchanger 8, a flow temperature sensor 15 is arranged, which is connected to the control unit 18, which is also arranged in the housing 20, to which the gas flow rate control element 4 and the blower 1 are also connected, and to which control signals are applied.

Zur Regelung des Druckes im Gehäuseinnenraum 19 ist eine Luftkammer 10 vorgesehen, in die das Luftzuführrohr 9 un­mittelbar mündet und die beispielsweise über ein Membran­stellventil mit dem Innenraum 19 des Gehäuses 20 verbun­den ist.To regulate the pressure in the interior 19 of the housing, an air chamber 10 is provided, into which the air supply pipe 9 opens directly and which is connected to the interior 19 of the housing 20, for example via a diaphragm control valve.

Bei einer Erhöhung des Soges des Gebläses 1 aufgrund ei­ner Erhöhung der Leistung des Brenners 6 biegt sich die Membrane 22 des Membranstellventiles 11 stärker durch, wodurch sich der mit der Membrane 22 bewegungsschlüssig verbundene Ventilkörper 23 weiter vom Ventilsitz 24 ent­fernt und daher der Strömungswiderstand beim Durchströmen der Luft durch das Membranstellventil 11 abnimmt. Dies führt zu einer Konstanthaltung des Druckes im Inneren 19 des Gehäuses 20, trotz der Tendenz des Gebläses 1 diesen, aufgrund der bei einer stärkeren Gasbeaufschlagung des Brenners erforderlichen Erhöhung der Drehzahl des Geblä­ses und der damit verbundenen Verstärkung seiner Saugwir­kung, abzusenken.With an increase in the suction of the blower 1 due to an increase in the power of the burner 6, the membrane 22 of the membrane control valve 11 bends more strongly, as a result of which the valve body 23, which is connected to the membrane 22 with a positive fit, moves further away from the valve seat 24 and therefore the flow resistance when flowing through the Air through the diaphragm control valve 11 decreases. This leads to a constant pressure in the interior 19 of the housing 20, in spite of the tendency of the blower 1 to lower it, due to the increase in the speed of the blower required by a stronger gas application to the burner and the associated increase in its suction effect.

Wie aus der Figur 2 zu ersehen ist, verarbeitet das Steu­ergerät 18 die alternativ von einem nicht dargestellten Raumthermostat und einem Außentemperatursensor kommenden Signale oder die von einem Heizwasser-Temperatursensor und einem Warmwasser-Temperatursensor kommenden Signale für die Steuerung des Brenners. Dabei werden das Gas­stellventil 4 und das Gebläse 1 angesteuert, wobei die Ansteuerung dieser beiden Elemente entsprechend der Be­triebskennlinie des Heizgerätes erfolgt, die in der Figur 4 beispielsweise dargestellt ist und später näher erläu­tert werden wird.As can be seen from FIG. 2, the control unit 18 processes the signals coming alternatively from a room thermostat (not shown) and an outside temperature sensor or the signals coming from a heating water temperature sensor and a hot water temperature sensor for controlling the burner. The gas control valve 4 and the blower 1 are activated, the activation of these two elements taking place in accordance with the operating characteristic of the heater, which is shown in FIG. 4 for example and will be explained in more detail later.

Weiter kann noch ein Gehäusedrucksensor (nicht darge­stellt) im Inneren 19 des Gehäuses 20 vorgesehen sein, der mit einem im Steuergerät 19 angeordneten Komparator verbunden ist, der ein Luftstellventil, das wie das in der Figur 1 dargestellte Membranstellventil 11 den Ein­strömwiderstand der Luft variiert, entsprechend ansteuert.Furthermore, a housing pressure sensor (not shown) can be provided in the interior 19 of the housing 20, which is connected to a comparator arranged in the control device 19, which correspondingly varies an air control valve which, like the diaphragm control valve 11 shown in FIG. 1, varies the inflow resistance of the air controls.

Figur 3 zeigt den Druckverlauf im Heizgerät, aus dem er­sichtlich ist, daß an der Abgasseite ein Überdruck und an der Luftseite ein Unterdruck herrscht.Figure 3 shows the pressure curve in the heater, from which it can be seen that there is an overpressure on the exhaust side and a negative pressure on the air side.

Die Leistung des Brenners 6 ist im wesentlichen von der Förderhöhe des Gebläses 1 abhängig, wobei vorausgesetzt wird, daß der dem Brenner 6 zugeführten Luft eine dem stöchiometrischen Verhältnis im wesentlichen entsprechen­de Gasmenge zugesetzt wird.The performance of the burner 6 is essentially dependent on the delivery head of the blower 1, it being assumed that an amount of gas substantially corresponding to the stoichiometric ratio is added to the air supplied to the burner 6.

Beim Betrieb des Brenners 6 herrscht, wie aus der Figur 3 ersichtlich, im Inneren 19 des Gehäuses 29 stets ein Un­terdruck, der durch entsprechende Abstimmung der Gebläse­förderhöhe mit den inneren und äußeren Strömungswider­ständen, die das Gebläse 1 bei der Nennwärmebelastung im Betriebspunkt A (Figur 4) zu überwinden hat, auf einen bestimmten Wert eingestellt werden. Maßgebend sind dafür die Widerstände in der Luftzuleitung, die Gebläsekennli­ nie sowie sicherheitstechnische Gesichtspunkte. So soll sich bei einer Laständerung der Druck im Inneren 19 des Gehäuses nicht wesentlich ändern.During operation of the burner 6, as can be seen from FIG. 3, there is always a negative pressure in the interior 19 of the housing 29, which, through appropriate coordination of the fan head with the internal and external flow resistances, which the fan 1 has at nominal heat load at operating point A (FIG. 4 ) has to be overcome, set to a certain value. The decisive factors are the resistance in the air supply line, the blower characteristics never as well as safety aspects. Thus, the pressure in the interior 19 of the housing should not change significantly when the load changes.

Der Nennlastpunkt A des Gebläses 1 entspricht dem Schnittpunkt der Widerstandskennlinie AC des Heizgerätes mit der durch die Speisespannung U₁ und die Drehzahl n₁ des Gebläses definierten Gebläsekennlinie U₁, n₁.The nominal load point A of the blower 1 corresponds to the intersection of the resistance characteristic AC of the heater with the blower characteristic U 1, n 1 defined by the supply voltage U 1 and the speed n 1 of the blower.

Bei einer reduzierten Last x QNB, wobei QNB die Nennlast des Heizgerätes und x einen Faktor < 1 bedeutet, führt eine zur Laständerung proportionale Ansteuerung des Ge­bläsemotors und des Gasdurchsatz-Stellgliedes zu den Be­triebspunkten für das Gebläse, die auf der Linie A-E-E′-B liegen. Für sie gelten die folgenden Beziehungen:

Figure imgb0001
With a reduced load x Q NB , where Q NB is the nominal load of the heater and x is a factor <1, a control of the blower motor and the gas flow actuator proportional to the load change leads to the operating points for the blower, which are on the line AEE'- B lie. The following relationships apply to them:
Figure imgb0001

Gegenüber dieser Gebläsekennlinie ist die Widerstands­kennlinie des Heizgerätes, wie aus der Figur 4 zu ersehen ist, gegen größere Förderhöhen des Gebläses zu verschie­ben, mit Ausnahme im Nennleistungspunkt A. Diese Ver­schiebung ergibt sich aus der Forderung, daß bei einerCompared to this blower characteristic, the resistance characteristic of the heater, as can be seen from FIG. 4, can be shifted towards larger delivery heights of the blower, with the exception of the nominal output point A. This shift results from the requirement that at a

Änderung des Gebläsevolumenstromes ein Teil des Gesamtwi­derstandes, und zwar der Widerstand des in das Gehäusein­nere 19 eingeführten Verbrennungsluftstromes, dargestellt durch den Gehäusedruck, konstant bleiben soll, während sich alle anderen Widerstandskomponenten entsprechend der Gleichung (2) verhalten. Die proportionale Anpassung der Gebläseansteuerung, insbesondere der Drehzahl des Geblä­ses führt daher nicht auf den gewünschten Betriebspunkt D, sondern zu Punkt E′, für den die Beziehung
Hx′ < Hx
gilt. Dies bedeutet, daß der Gehäuseunterdruck kleiner als erwartet ist.Changing the fan volume flow is a part of the total resistance, namely the resistance of the combustion air flow introduced into the housing interior 19, represented by the housing pressure, should remain constant, while all other resistance components behave according to equation (2). The proportional adjustment of the fan control, in particular the speed of the fan therefore does not lead to the desired operating point D, but to point E ', for which the relationship
H x ′ <H x
applies. This means that the housing vacuum is less than expected.

Diese Abweichung führt zum vorzeitigen Abschalten durch den bei solchen Heizgeräten üblicherweise vorhandenen Differenzdruckwächter oder zu einer Einengung des Modula­tionsbereiches der Leistung des Heizgerätes.This deviation leads to premature switching off due to the differential pressure switch usually present in such heaters or to a narrowing of the modulation range of the power of the heater.

Durch das erfindungsgemäße Verfahren wird dies dadurch vermieden, daß das Gebläse bei Laständerungen nicht pro­portional zu x, sondern proportional zu x + x angesteu­ert wird. Das Korrekturglied x ist in Abhängigkeit vom gewünschten Gehäuseunterdruck so zu bestimmen, daß die durch den Punkt D gehende Gebläsekennlinie (Ux, nx) er­reicht wird.This is avoided by the method according to the invention in that the fan is not controlled in proportion to x, but rather in proportion to x + x when the load changes. The correction element x is to be determined as a function of the desired negative pressure in the housing in such a way that the fan characteristic curve (U x , n x ) passing through point D is achieved.

Auf der für den neuen Belastungszustand angesteuerten Ge­bläsekennlinie Ux, nx muß der Gebläsebetriebspunkt vom Punkt E nach dem Punkt D verschoben werden. Dies wird da­durch erreicht, daß der Widerstand des Luftstellgliedes 11, das den Durchlaß zwischen der Luftkammer 10 und dem Inneren 19 des Gehäuses 20 steuert, angehoben wird.The blower operating point must be shifted from point E to point D on the blower characteristic curve U x , n x which is controlled for the new load state. This is accomplished by increasing the resistance of the air actuator 11 that controls the passage between the air chamber 10 and the interior 19 of the housing 20.

Claims (6)

1. Verfahren zur Steuerung eines Heizgerätes mit einem Vormisch-Gasbrenner, der samt einem Wärme­tauscher in einer im Inneren des gegenüber der Umgebung, mit Ausnahme einer Luftzuführleitung, abgedichteten Gehäuses des Heizgerätes angeord­neten und gegenüber diesem abgedichteten Kammer montiert ist, welche Kammer mit einer Abgaslei­tung verbunden ist, wobei der Brenner über ein regelbares Gasdurchsatz-Stellglied beaufschlagt und ein den Brenner versorgendes, aus dem Inne­ren des Gehäuses ansaugendes Gebläse in seiner Drehzahl abhängig vom Gasdurchsatz steuerbar ist und die Luftzuführleitung in eine im Inneren des Gehäuses angeordnete Luftkammer mündet, die über ein Stellorgan mit dem Inneren des Gehäuses ver­bunden ist, dadurch gekennzeichnet, daß bei ei­ner Verminderung der Brennerleistung der Strö­mungswiderstand der in das Innere des Gehäuses zuströmenden Luft durch Verstellung des Stell­ gliedes zwischen Luftkammer und Gehäuseinnerem in vorgegebener Weise vergrößert und bei Anhe­bung der Brennerleistung ebenso verkleinert wird.1. A method for controlling a heater with a premix gas burner which, together with a heat exchanger, is arranged in a housing of the heater which is arranged in the interior of the heater and is sealed off from the environment, with the exception of an air supply line, and is sealed relative to the chamber, which chamber is connected to an exhaust gas line The burner is acted upon by a controllable gas throughput actuator and the speed of a fan supplying the burner from the interior of the housing can be controlled depending on the gas throughput and the air supply line opens into an air chamber arranged in the interior of the housing and via an actuator is connected to the interior of the housing, characterized in that when the burner output is reduced, the flow resistance of the air flowing into the interior of the housing is adjusted by adjusting the position link between the air chamber and the interior of the housing is enlarged in a predetermined manner and is also reduced when the burner output is increased. 2. Verfahren nach Anspruch 1, dadurch gekennzeich­net, daß der Druck im Gehäuseinneren des Heizge­rätes bei Änderung der Brennerleistung auf einem Soll-Wert konstant gehalten wird.2. The method according to claim 1, characterized in that the pressure inside the housing of the heater is kept constant at a desired value when the burner output changes. 3. Heizgerät zur Durchführung des Verfahrens nach Anspruch 1 oder 2, mit einem Vormisch-Gasbren­ner, der samt einem Wärmetauscher in einer im Inneren des gegenüber der Umgebung, mit Ausnahme einer Luftzuführleitung, abgedichteten Gehäuses des Heizgerätes angeordneten und gegenüber die­sem abgedichteten Kammer montiert ist, welche Kammer mit einer Abgasleitung verbunden ist, wo­bei der Brenner über ein regelbares Gasdurch­satz-Stellglied beaufschlagt und ein den Brenner versorgendes, aus dem Inneren des Gehäuses an­saugendes Gebläse in seiner Drehzahl abhängig vom Gasdurchsatz steuerbar ist und die Luftzu­führleitung in eine im Inneren des Gehäuses an­geordnete Luftkammer mündet, die über ein Stell­organ mit dem Inneren des Gehäuses verbunden ist, dadurch gekennzeichnet, daß das Gasdurch­satz-Stellglied (4) und der Gebläsemotor (2) auf elektrische Signale aus einem Steuergerät (18) ansprechen, das die Koppelung von Gas- und Luft­strom nach vorgegebenen Soll-Werten steuert.3. Heater for carrying out the method according to claim 1 or 2, with a premix gas burner which, together with a heat exchanger, is arranged in an interior of the housing of the heater which is sealed with respect to the environment, with the exception of an air supply line, and is mounted with respect to this chamber, which chamber is connected to an exhaust pipe, the burner acting on a controllable gas flow actuator and the speed of a fan supplying the burner from the interior of the housing can be controlled in terms of its speed depending on the gas flow and the air supply line into an air chamber arranged inside the housing opens, which is connected to the interior of the housing via an actuator is characterized in that the gas flow actuator (4) and the blower motor (2) respond to electrical signals from a control device (18) which controls the coupling of gas and air flow according to predetermined target values. 4. Heizgerät nach Anspruch 3, dadurch gekennzeich­net, daß die Luftkammer (10) mit dem Inneren des Gehäuses (20) über ein Stellglied (11) verbunden ist, das direkt oder indirekt durch die Druck­differenz zwischen beiden Räumen gesteuert ist.4. A heater according to claim 3, characterized in that the air chamber (10) with the interior of the housing (20) via an actuator (11) is connected, which is controlled directly or indirectly by the pressure difference between the two rooms. 5. Heizgerät nach Anspruch 3 und 4, dadurch gekenn­zeichnet, daß das Stellglied (11) ein Membran­ventil ist.5. A heater according to claim 3 and 4, characterized in that the actuator (11) is a diaphragm valve. 6. Heizgerät nach Anspruch 3 bis 5, dadurch gekenn­zeichnet, daß das Stellglied (11) mit Grenzwert­gebern zum Abschalten des Brenners ausgestattet ist.6. Heater according to claim 3 to 5, characterized in that the actuator (11) is equipped with limit switches for switching off the burner.
EP90122065A 1989-11-24 1990-11-19 Method for controlling a heater Expired - Lifetime EP0429034B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0268689A AT397851B (en) 1989-11-24 1989-11-24 HEATER
AT2686/89 1989-11-24

Publications (3)

Publication Number Publication Date
EP0429034A2 true EP0429034A2 (en) 1991-05-29
EP0429034A3 EP0429034A3 (en) 1992-05-27
EP0429034B1 EP0429034B1 (en) 1996-06-05

Family

ID=3538680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122065A Expired - Lifetime EP0429034B1 (en) 1989-11-24 1990-11-19 Method for controlling a heater

Country Status (3)

Country Link
EP (1) EP0429034B1 (en)
AT (2) AT397851B (en)
DE (2) DE59010357D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303700A1 (en) * 1993-02-09 1994-08-18 Buderus Heiztechnik Gmbh Device for regulating the gas/air ratio in a gas burner
EP0909922A1 (en) * 1997-10-17 1999-04-21 IABER S.p.A. Combined gas-air control system for controlling combustion in gas fired boilers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021112034A1 (en) * 2021-05-07 2022-11-10 Pilz Gmbh & Co. Kg Method for monitoring operation of a gas burner system and gas burner system
DE102022133634A1 (en) 2022-12-16 2024-06-27 Vaillant Gmbh Method for operating a heating device, computer program, control device, heating device and use of a throttle device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388073A (en) * 1941-04-29 1945-10-30 Gen Electric Fluid flow control
US3978883A (en) * 1974-05-06 1976-09-07 Danfoss A/S Device for regulating the combustion air of a furnace, especially with oil- or gasburner and blower for heating installations
JPS59153024A (en) * 1983-02-22 1984-08-31 Matsushita Electric Ind Co Ltd Combustion fan
JPS6391428A (en) * 1986-10-03 1988-04-22 Rinnai Corp Combustor with forced air supply
EP0303559A2 (en) * 1987-08-13 1989-02-15 Joh. Vaillant GmbH u. Co. Circulation of combustion air to the burner of a burner appliance, for instance of a water heater
EP0424358A2 (en) * 1989-10-20 1991-04-24 Joh. Vaillant GmbH u. Co. Heating apparatus with a flow quantity control device for the flow of combustion air

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2754423A1 (en) * 1977-12-07 1979-06-13 Vaillant Joh Gmbh & Co Fireplace with fresh air supply blower - has annular air duct and blower with control system by=passing fireplace
DE3147857A1 (en) * 1980-11-27 1983-06-16 Honeywell B.V., Amsterdam Control device
DE3342339A1 (en) * 1983-11-23 1985-05-30 Siemens AG, 1000 Berlin und 8000 München CONTROL DEVICE FOR A HEATING BURNER
DE3517471A1 (en) * 1984-05-19 1985-11-28 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Control for the fuel/air ratio of a fuel-heated heat source
AT389933B (en) * 1987-06-05 1990-02-26 Vaillant Gmbh DEVICE FOR CONTROLLING THE FUEL SUPPLY TO A FUEL-HEATED DEVICE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388073A (en) * 1941-04-29 1945-10-30 Gen Electric Fluid flow control
US3978883A (en) * 1974-05-06 1976-09-07 Danfoss A/S Device for regulating the combustion air of a furnace, especially with oil- or gasburner and blower for heating installations
JPS59153024A (en) * 1983-02-22 1984-08-31 Matsushita Electric Ind Co Ltd Combustion fan
JPS6391428A (en) * 1986-10-03 1988-04-22 Rinnai Corp Combustor with forced air supply
EP0303559A2 (en) * 1987-08-13 1989-02-15 Joh. Vaillant GmbH u. Co. Circulation of combustion air to the burner of a burner appliance, for instance of a water heater
EP0424358A2 (en) * 1989-10-20 1991-04-24 Joh. Vaillant GmbH u. Co. Heating apparatus with a flow quantity control device for the flow of combustion air

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 325 (M-737)(3172) 5. September 1988 & JP-A-63 091 428 ( RINNAI CORP ) 22. April 1988 *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 284 (M-348)(1721) 26. Dezember 1984 & JP-A-59 153 024 ( MATSUSHITA DENKI ) 31. August 1984 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303700A1 (en) * 1993-02-09 1994-08-18 Buderus Heiztechnik Gmbh Device for regulating the gas/air ratio in a gas burner
DE4303700C2 (en) * 1993-02-09 1998-02-26 Buderus Heiztechnik Gmbh Device for regulating the gas-air ratio in a gas premix burner
EP0909922A1 (en) * 1997-10-17 1999-04-21 IABER S.p.A. Combined gas-air control system for controlling combustion in gas fired boilers

Also Published As

Publication number Publication date
DE4037397A1 (en) 1991-05-29
DE59010357D1 (en) 1996-07-11
EP0429034A3 (en) 1992-05-27
ATA268689A (en) 1993-11-15
EP0429034B1 (en) 1996-06-05
ATE139023T1 (en) 1996-06-15
AT397851B (en) 1994-07-25

Similar Documents

Publication Publication Date Title
EP0644377B1 (en) Control device for gas burners
DE3010014C2 (en) Device for adjusting the combustion air flow in fuel gas consumers
DE3639172C2 (en)
DE2615697C2 (en) Flow control device
EP0275439B1 (en) Power regulation apparatus for a fuel-heated generator
EP0062854B1 (en) Gas-fired water or air heater
DE2510091C2 (en) Incinerator
AT396028B (en) METHOD FOR CONTROLLING A FULLY PRE-MIXING AREA BURNER
EP0505714A2 (en) Control device for a gas burner with a fan for supplying combustion air
EP0429034A2 (en) Method for controlling a heater
DE4312801A1 (en) Method of controlling a gas forced draft burner
DE68910277T2 (en) Modulated gas radiator.
EP1063481B1 (en) Gas fired instantaneous water heater
DE3705437A1 (en) COMBUSTION CONTROL ARRANGEMENT
EP0016326B1 (en) Gas-pressure controller
DE4440492A1 (en) Continuous water heater
EP0036613B1 (en) Regulation apparatus for a gas-fired water or air heater which is controllable by a temperature sensor
DE3114942A1 (en) CONTROL DEVICE FOR THE GAS-FIRED BOILER OF A HOT WATER HEATING SYSTEM
EP0863367B1 (en) Control device for a gas burner
EP0434599B1 (en) Premixing gas burner
DE3689309T2 (en) Control of the fluid temperature in a hot water central heating system and components suitable for a central heating system.
AT398622B (en) Method for controlling a blower-type burner
EP0206132A2 (en) Switch controlled as a function of the pressure
EP0036610B1 (en) Method of energizing a fuel-heated heat source
AT394426B (en) OVERFLOW VALVE

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 DE DK ES FR GB GR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19921020

17Q First examination report despatched

Effective date: 19940816

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VAILLANT LTD.

Owner name: JOH. VAILLANT GMBH U. CO.

Owner name: N.V. VAILLANT S.A.

Owner name: VAILLANT GES.M.B.H

Owner name: VAILLANT GMBH

Owner name: VAILLANT B.V.

Owner name: VAILLANT S.A.R.L

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

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 DE DK ES FR GB GR IT LI LU NL SE

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19960605

Ref country code: DK

Effective date: 19960605

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19960605

Ref country code: NL

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: 19960605

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: 19960605

Ref country code: GB

Effective date: 19960605

Ref country code: FR

Effective date: 19960605

REF Corresponds to:

Ref document number: 139023

Country of ref document: AT

Date of ref document: 19960615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59010357

Country of ref document: DE

Date of ref document: 19960711

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19960905

EN Fr: translation not filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
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: 19961130

Ref country code: BE

Effective date: 19961130

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19960605

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

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19991013

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19991117

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19991214

Year of fee payment: 10

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: 20001119

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001130

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001130

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: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010801