EP2160541B1 - Control arrangement for a gas stove - Google Patents

Control arrangement for a gas stove Download PDF

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Publication number
EP2160541B1
EP2160541B1 EP08760867.5A EP08760867A EP2160541B1 EP 2160541 B1 EP2160541 B1 EP 2160541B1 EP 08760867 A EP08760867 A EP 08760867A EP 2160541 B1 EP2160541 B1 EP 2160541B1
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EP
European Patent Office
Prior art keywords
control
signal
control apparatus
burner
arrangement according
Prior art date
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Application number
EP08760867.5A
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German (de)
French (fr)
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EP2160541A2 (en
Inventor
Emilio Placer Maruri
Martin Oberhomburg
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2160541A2 publication Critical patent/EP2160541A2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays 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
    • F23N1/002—Regulating fuel supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/10—Arrangement or mounting of ignition devices
    • F24C3/103—Arrangement or mounting of ignition devices of electric ignition devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/18—Chopper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/34—Continuously applied ignition cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • 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
    • F23N2237/00—Controlling
    • F23N2237/10—High or low fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus

Definitions

  • the invention relates to a control arrangement for a gas stove with at least one gas burner, wherein the control arrangement at least one control element for switching on and off of the gas burner, at least one signal generator which generates a signal dependent on the position of the control element, and at least one first control device which in response to the signal of the signal generator controls an ignition or extinguishment of a flame on the gas burner comprises.
  • Control arrangements of the type mentioned are designed such that an operator can control the switching on and off of the gas burner and adjusting the flame size by turning the control. In particular, switching on the gas burner by simply turning the control element is possible - it is not necessary to press the control in the axial direction or to hold in a particular position.
  • the switching on and off of the gas burner is completely controlled by the first control device in response to the output signal of the usually electrical signal generator on the control element.
  • the first control device also evaluates a signal from a flame detector. The signal from the flame monitor indicates whether there is a flame on the burner or not.
  • the first control device then activates a shut-off valve and an ignition device. With the ignition device sparks can be generated in the region of the burner to ignite the gas exiting the burner.
  • the shut-off valve is arranged in the gas line in front of a flow control valve, which is also operated with the control element.
  • the shut-off valve is spring-loaded in the closed position and can be opened electromagnetically against the spring force.
  • the electromagnet for opening the shut-off valve is controlled by the first control device.
  • the burner power is controlled exclusively with the operable with the control flow control valve.
  • the flow cross section in Flow control valve can be adjusted continuously by the operator.
  • the flow cross-section in the flow control valve is preset, for example by means of its own flow channel. From the pamphlets EP 1 215 441 A2 and U.S. 5,575,638 It is known to lower the amount of heat emitted by the burner in a gas stove under the design-based smallest burner power. For this purpose, the flame is continuously ignited and extinguished at the burner, so that averaged over the time results in a heat output that is less than the performance of the burner at the smallest flame.
  • the GB 2100488 A a gas burner control arrangement with a sequencer which generates a plurality of binary signal sequences as output signals and transmits them to a safety unit.
  • This safety unit is set up to control, in consideration of the received signal, an opening or closing of a shutdown circuit in such a way that the gas burner is ignited or extinguished.
  • the DE 9407567 U discloses a device for the electronic control of both gas and electric cooking stations.
  • the controller has at least one EEPROM with different, time-dependent characteristics and / or cycle times for electric and gas operation.
  • the present invention is therefore an object of the invention to provide a generic control arrangement for a gas stove available that allows for otherwise unchanged functionality in a simple way, a reduction of the burner performance.
  • the heat output of the burner is reduced by the fact that the burner is continuously ignited and recovered. All components of a generic control arrangement can be used here unchanged.
  • a second control device is interposed between the electrical signal transmitter and the first control device. This second device evaluates the signal from the signal generator. If, with the signal of the signal generator, a power reduction of the burner is specified below the minimum burner output at a constant minimum flame, the second control device simulates a continuous switching on and off by means of the operating element.
  • the first control device is supplied by the second control device, a signal corresponding to the signal when at generic arrangement, the operator repeatedly turns on and off the burner by means of the control element. In order to achieve the required functionality of a reduced burner output, therefore, no changes are necessary in the first control device.
  • At least one flow control valve with variable flow cross-section is provided, which is operable with the control element.
  • the operator controls the gas flow rate to the gas burner and thus the flame size.
  • the arrangement according to the invention can also be used if at least one flame detector is provided which, depending on the presence of a flame on the gas burner, generates an electrical signal which is fed to the first control device.
  • the flame detector for example, be designed as a thermocouple that generates an electrical voltage while the burner has a flame.
  • shut-off valve can be provided which can be activated by the first control device.
  • the shut-off valve serves to interrupt the gas supply before the flow control valve. This happens, for example, when the burner is turned off or when despite open flow control valve for a long time from the flame detector no flame is signaled.
  • a commercially available shut-off valve can be used, which is biased in the closed position by means of the force of a spring.
  • the shut-off valve can be opened electromagnetically, for which it has a single coil, which is acted upon by the first control device to open the shut-off valve with voltage.
  • At least one ignition device is provided, which is expediently also controlled by the first control device.
  • the ignition device With the ignition device, a spark can be generated in the region of the gas outlet openings of the gas burner, which ignites the gas emerging from the burner.
  • the first control device can thus completely control the process of igniting the gas burner. This includes opening the shut-off valve, igniting the exiting Gas by means of the igniter and monitoring the emergence of a flame by means of the flame guard.
  • the first control device and the second control device are designed as separate units.
  • the first control device can thus be used unchanged for generic and control arrangements according to the invention.
  • the second control device is connected between the signal generator and the first control device. The input signal of the first control device is then no longer supplied directly by the signal generator on the operating element but by the second control device.
  • the second control device and the first control device form a structural unit.
  • the two control devices can be combined in a common housing.
  • the output signal of the second control device which is supplied to the first control device, a discrete on / off signal.
  • This on / off signal indicates the desired state of the burner, i.e., whether it should be on or off.
  • the first controller then establishes the desired state of the burner.
  • the output signal of the second control device continuously changes, this causes the first control device to continuously turn on and off the burner accordingly.
  • the second control device is connected to the first control device via a data bus.
  • the data bus represents a defined interface between the control devices and makes it possible to transmit other information in addition to the on / off signal.
  • a particularly favorable construction of the signal generator is achieved if the signal generator generates a multistage discrete signal as a function of the position of the operating element.
  • the various stages of the multi-level discrete signal may mean, for example: burner off, burner on without power reduction, power reduction stage 1, power reduction stage 2, etc.
  • the multi-stage discrete signal can for example be generated by electrical resistors are switched in the signal generator in dependence on the position of the control element.
  • the second control device is designed such that the respective stages of the discrete signal of the signal generator is assigned a specific ratio between the on-time and off-time of the burner.
  • the ratio between on-time and off-time determines the averaged over the time burning power of the burner.
  • the gas stove has two or more burners, for which a common first control device is provided.
  • the first control device has correspondingly many electrical signal inputs and signal outputs in order to be able to control the functions mentioned separately for each burner.
  • the gas stove has two or more control elements with electrical signal transmitters which are assigned to a common second control device.
  • the function of power reduction can thus be controlled for multiple burners with a single second control device.
  • the input signals from a plurality of signal transmitters are correspondingly evaluated in a single second control device.
  • a shut-off valve (3) and an electrical signal generator (4) are arranged.
  • a flame detector (5) and an ignition electrode (6) are arranged in the area of a gas burner (1).
  • the presentation of gas lines has been omitted.
  • the operator specifies whether the burner (1) should be switched on or off and which output the burner (1) should deliver.
  • the operator controls by means of the operating element (7) the opening cross-section of the flow control valve (2).
  • the position of the operating element (7) by means of the electrical signal transmitter (4) is detected. Based on the electrical output signal of the signal generator (4), the burner is switched on and off by means of the control devices (11) and (12).
  • the output signal of the signal generator (4) consists of an electrical resistance, which is measured by the second control device (12). This resistance signal is converted by the second control device (12) into a digital on / off signal, which is supplied to the first control device (11): When the operator has switched off the burner by means of the operating element (7), the signal generator (4) delivers a corresponding resistance signal, which is converted by the second control device into a constant "off" signal.
  • the first control device (11) leaves the burner switched off, ie, the shut-off valve (3) remains closed and the ignition device (16) is not activated.
  • the signal generator (4) supplies a second resistance value.
  • the second control device (12) converts this second resistance into a constant "on" signal.
  • the first control device (11) then opens the shut-off valve (3), operates the ignition device (16) and monitors the presence of a flame on the burner (1) by means of the flame detector (5).
  • the first control device closes the shut-off valve (3) automatically, if it fails to ignite a flame on the burner (1), or if the flame goes out and re-ignition attempts fail.
  • the signal generator (4) supplies a third resistance value.
  • the third resistance value is converted by the second control device (12) in such a way that an "on" signal and an "off” signal are alternately supplied to the first control device (11). This leads to, the first control device (11) continuously switches the burner on and off.
  • the control device (11) automatically controls the opening and closing of the shut-off valve (3) and the ignition of the flame by means of the ignition device.
  • the flow control valve (2) is set to minimum burner power in this mode.
  • the burner For the operation of the burner with a power that is lower than the design minimum burner power, more power levels can be provided, which can be specified by means of the control element (7).
  • each power level assigned a certain resistance value.
  • the heat output of the burner is then controlled by the second control device (12) in accordance with the ratio of the on time to the off time of the burner. For example, a stepwise variation of the ratio of the switch-on time to the switch-off time between 80:20 and 20:80 is conceivable.
  • a signal generator (4) delivering a discrete step signal
  • a continuously operating signal generator for example a potentiometer.
  • the ratio of the switch-on time to the switch-off time can then be varied steplessly by the second control device (12).
  • the operating state in which the burner burns continuously can be defined by a lower and an upper limit for the output signal of the signal generator when using a continuous signal generator.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)

Description

Gegenstand der Erfindung ist eine Steueranordnung für einen Gasherd mit mindestens einem Gasbrenner, wobei die Steueranordnung mindestens ein Bedienelement zum Ein- und Ausschalten des Gasbrenners, mindestens einen Signalgeber, welcher ein von der Stellung des Bedienelements abhängiges Signal erzeugt, und mindestens eine erste Steuervorrichtung, welche in Abhängigkeit von dem Signal des Signalgebers ein Zünden oder ein Löschen einer Flamme am Gasbrenner steuert, umfasst.The invention relates to a control arrangement for a gas stove with at least one gas burner, wherein the control arrangement at least one control element for switching on and off of the gas burner, at least one signal generator which generates a signal dependent on the position of the control element, and at least one first control device which in response to the signal of the signal generator controls an ignition or extinguishment of a flame on the gas burner comprises.

Steueranordnungen der genannten Art sind derart ausgeführt, dass eine Bedienperson das Ein- und Ausschalten des Gasbrenners und das Einstellen der Flammengröße durch Drehen des Bedienelements steuern kann. Insbesondere ist auch ein Einschalten des Gasbrenners durch einfaches Drehen des Bedienelements möglich - es ist nicht erforderlich, das Bedienelement in axialer Richtung zu drücken oder in einer bestimmten Stellung zu halten.Control arrangements of the type mentioned are designed such that an operator can control the switching on and off of the gas burner and adjusting the flame size by turning the control. In particular, switching on the gas burner by simply turning the control element is possible - it is not necessary to press the control in the axial direction or to hold in a particular position.

Das Ein- und Ausschalten des Gasbrenners wird in Abhängigkeit von dem Ausgangssignal des in der Regel elektrischen Signalgebers am Bedienelement vollständig von der ersten Steuervorrichtung gesteuert. Neben dem Signal des Signalgebers am Bedienelement wertet die erste Steuervorrichtung hierzu auch ein Signal eines Flammenwächters aus. Das Signal des Flammenwächters gibt wieder, ob am Brenner eine Flamme vorhanden ist oder nicht. Die erste Steuervorrichtung steuert daraufhin ein Absperrventil und eine Zündvorrichtung an. Mit der Zündvorrichtung können im Bereich des Brenners Funken erzeugt werden, um das am Brenner austretende Gas zu entzünden. Das Absperrventil ist in der Gasstrecke vor einem Mengenregelventil angeordnet, das ebenfalls mit dem Bedienelement betätigt wird. Das Absperrventil ist in Schließstellung federbelastet und kann entgegen der Federkraft elektromagnetisch geöffnet werden. Der Elektromagnet zum Öffnen des Absperrventils wird von der ersten Steuervorrichtung angesteuert.The switching on and off of the gas burner is completely controlled by the first control device in response to the output signal of the usually electrical signal generator on the control element. In addition to the signal of the signal generator on the control element, the first control device also evaluates a signal from a flame detector. The signal from the flame monitor indicates whether there is a flame on the burner or not. The first control device then activates a shut-off valve and an ignition device. With the ignition device sparks can be generated in the region of the burner to ignite the gas exiting the burner. The shut-off valve is arranged in the gas line in front of a flow control valve, which is also operated with the control element. The shut-off valve is spring-loaded in the closed position and can be opened electromagnetically against the spring force. The electromagnet for opening the shut-off valve is controlled by the first control device.

Bei mit gattungsgemäßen Steueranordnungen ausgestatteten Gasherden des Standes der Technik wird die Brennerleistung ausschließlich mit dem mit dem Bedienelement betätigbaren Mengenregelventil gesteuert. Der Strömungsquerschnitt im Mengenregelventil kann hierbei durch die Bedienperson stufenlos eingestellt werden. Für die kleinste mögliche Brennerleistung ist der Strömungsquerschnitt im Mengenregelventil fest voreingestellt, beispielsweise mittels eines eigenen Strömungskanals.
Aus den Druckschriften EP 1 215 441 A2 und US 5 575 638 ist es bekannt, bei einem Gasherd die vom Brenner abgegebene Wärmemenge unter die bauartbedingt kleinste Brennerleistung abzusenken. Hierzu wird die Flamme am Brenner fortlaufend gezündet und wieder gelöscht, sodass sich über die Zeit gemittelt eine Wärmeleistung ergibt, die geringer ist als die Leistung des Brenners bei kleinster Flamme. Diese Steueranordnungen des Standes der Technik benötigen aber speziell angepasste Komponenten, beispielsweise ein Absperrventil mit zwei Magnetspulen, oder sie sind nicht für den Betrieb mit einem Flammenwächter geeignet.
Ferner offenbart die GB 2100488 A eine Steueranordnung für Gasbrenner mit einem Sequenzer, welcher mehrere binäre Signalfolgen als Ausgangssignale erzeugt und an eine Sicherheitseinheit überträgt. Diese Sicherheitseinheit ist dazu eingerichtet, unter Berücksichtigung des empfangenen Signals ein Öffnen oder Schließen eines Abschaltkreises so zu steuern, dass der Gasbrenner gezündet oder gelöscht wird.
Die DE 9407567 U offenbart eine Vorrichtung zur elektronischen Steuerung von sowohl Gas- als auch Elektrokochstellen. Hierzu weist die Steuerung wenigstens ein EEPROM mit unterschiedlichen, zeitabhängigen Kennlinien und/oder Taktzeiten für Elektro- und Gasbetrieb auf.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine gattungsgemäße Steueranordnung für einen Gasherd zur Verfügung zu stellen, die bei ansonsten unveränderter Funktionalität auf einfache Weise eine Reduzierung der Brennerleistung ermöglicht.In equipped with generic control arrangements gas stoves of the prior art, the burner power is controlled exclusively with the operable with the control flow control valve. The flow cross section in Flow control valve can be adjusted continuously by the operator. For the smallest possible burner output, the flow cross-section in the flow control valve is preset, for example by means of its own flow channel.
From the pamphlets EP 1 215 441 A2 and U.S. 5,575,638 It is known to lower the amount of heat emitted by the burner in a gas stove under the design-based smallest burner power. For this purpose, the flame is continuously ignited and extinguished at the burner, so that averaged over the time results in a heat output that is less than the performance of the burner at the smallest flame. However, these prior art control assemblies require specially adapted components, such as a double solenoid shut-off valve, or are not suitable for operation with a flame detector.
Further, the GB 2100488 A a gas burner control arrangement with a sequencer which generates a plurality of binary signal sequences as output signals and transmits them to a safety unit. This safety unit is set up to control, in consideration of the received signal, an opening or closing of a shutdown circuit in such a way that the gas burner is ignited or extinguished.
The DE 9407567 U discloses a device for the electronic control of both gas and electric cooking stations. For this purpose, the controller has at least one EEPROM with different, time-dependent characteristics and / or cycle times for electric and gas operation.
The present invention is therefore an object of the invention to provide a generic control arrangement for a gas stove available that allows for otherwise unchanged functionality in a simple way, a reduction of the burner performance.

Diese Aufgabe wird erfindungsgemäß mit einer Steueranordnung gemäß Anspruchs 1 gelöst.This object is achieved with a control arrangement according to claim 1.

Auch bei der erfindungsgemäßen Steueranordnung wird die Wärmeleistung des Brenners dadurch reduziert, dass der Brenner fortlaufend gezündet und wieder ausgemacht wird. Alle Komponenten einer gattungsgemäßen Steueranordnung können hierbei unverändert weiterverwendet werden. Um die gewünschte Funktionalität der Leistungsreduzierung zu erreichen, wird zwischen den elektrischen Signalgeber und die erste Steuervorrichtung eine zweite Steuervorrichtung zwischengeschaltet. Diese zweite Vorrichtung wertet das Signal des Signalgebers aus. Wenn mit dem Signal des Signalgebers eine Leistungsreduzierung des Brenners unter die minimale Brennerleistung bei konstant kleinster Flamme vorgegeben ist, wird von der zweiten Steuervorrichtung ein fortlaufendes Ein- und Ausschalten mittels des Bedienelements simuliert. Der ersten Steuervorrichtung wird dabei von der zweiten Steuervorrichtung ein Signal zugeführt, das dem Signal entspricht, wenn bei einer gattungsgemäßen Anordnung die Bedienperson den Brenner mittels des Bedienelements immer wieder ein- und ausschaltet. Um die geforderte Funktionalität einer reduzierten Brennerleistung zu erreichen, sind daher bei der ersten Steuervorrichtung keine Veränderungen notwendig.Also in the control arrangement according to the invention, the heat output of the burner is reduced by the fact that the burner is continuously ignited and recovered. All components of a generic control arrangement can be used here unchanged. In order to achieve the desired functionality of the power reduction, a second control device is interposed between the electrical signal transmitter and the first control device. This second device evaluates the signal from the signal generator. If, with the signal of the signal generator, a power reduction of the burner is specified below the minimum burner output at a constant minimum flame, the second control device simulates a continuous switching on and off by means of the operating element. The first control device is supplied by the second control device, a signal corresponding to the signal when at generic arrangement, the operator repeatedly turns on and off the burner by means of the control element. In order to achieve the required functionality of a reduced burner output, therefore, no changes are necessary in the first control device.

Bevorzugt ist mindestens ein Mengenregelventil mit variablem Strömungsquerschnitt vorgesehen, das mit dem Bedienelement betätigbar ist. Über das Mengenregelventil steuert die Bedienperson den Gasmengenstrom zum Gasbrenner und damit die Flammengröße.Preferably, at least one flow control valve with variable flow cross-section is provided, which is operable with the control element. Using the flow control valve, the operator controls the gas flow rate to the gas burner and thus the flame size.

Die erfindungsgemäße Anordnung ist ebenfalls einsetzbar, wenn mindestens ein Flammenwächter vorgesehen ist, der in Abhängigkeit vom Vorhandensein einer Flamme am Gasbrenner ein elektrisches Signal erzeugt, welches der ersten Steuervorrichtung zugeführt wird. Der Flammenwächter kann beispielsweise als Thermoelement ausgeführt sein, das eine elektrische Spannung erzeugt, während am Brenner eine Flamme vorhanden ist.The arrangement according to the invention can also be used if at least one flame detector is provided which, depending on the presence of a flame on the gas burner, generates an electrical signal which is fed to the first control device. The flame detector, for example, be designed as a thermocouple that generates an electrical voltage while the burner has a flame.

Darüber hinaus kann mindestens ein Absperrventil vorgesehen sein, welches von der ersten Steuervorrichtung ansteuerbar ist. Das Absperrventil dient dazu, die Gasversorgung bereits vor dem Mengenregelventil zu unterbrechen. Dies geschieht beispielsweise dann, wenn der Brenner ausgeschaltet ist oder wenn trotz geöffnetem Mengenregelventil über längere Zeit vom Flammenwächter keine Flamme signalisiert wird. In der erfindungsgemäßen Steueranordnung kann ein handelsübliches Absperrventil verwendet werden, das in Schließstellung mittels der Kraft einer Feder vorgespannt ist. Das Absperrventil kann elektromagnetisch geöffnet werden, wozu es eine einzige Spule aufweist, die zum Öffnen des Absperrventils von der ersten Steuervorrichtung mit Spannung beaufschlagt wird.In addition, at least one shut-off valve can be provided which can be activated by the first control device. The shut-off valve serves to interrupt the gas supply before the flow control valve. This happens, for example, when the burner is turned off or when despite open flow control valve for a long time from the flame detector no flame is signaled. In the control arrangement according to the invention, a commercially available shut-off valve can be used, which is biased in the closed position by means of the force of a spring. The shut-off valve can be opened electromagnetically, for which it has a single coil, which is acted upon by the first control device to open the shut-off valve with voltage.

Für den Gasbrenner ist mindestens eine Zündvorrichtung vorgesehen, die zweckmäßigerweise ebenfalls von der ersten Steuervorrichtung ansteuerbar ist. Mit der Zündvorrichtung kann im Bereich der Gasaustrittsöffnungen des Gasbrenners ein Funke erzeugt werden, der das aus dem Brenner austretende Gas entfacht. Die erste Steuervorrichtung kann damit den Vorgang des Zündens des Gasbrenners vollständig steuern. Dies umfasst das Öffnen des Absperrventils, das Zünden des austretenden Gases mittels der Zündvorrichtung und das Überwachen des Entstehens einer Flamme mittels des Flammenwächters.For the gas burner at least one ignition device is provided, which is expediently also controlled by the first control device. With the ignition device, a spark can be generated in the region of the gas outlet openings of the gas burner, which ignites the gas emerging from the burner. The first control device can thus completely control the process of igniting the gas burner. This includes opening the shut-off valve, igniting the exiting Gas by means of the igniter and monitoring the emergence of a flame by means of the flame guard.

Gemäß einer zweckmäßigen Ausgestaltungsform sind die erste Steuervorrichtung und die zweite Steuervorrichtung als getrennte Baueinheiten ausgeführt. Die erste Steuervorrichtung kann damit unverändert für gattungsgemäße und für erfindungsgemäße Steueranordnungen verwendet werden. Um eine Steueranordnung mit der Möglichkeit der Leistungsreduzierung zu erhalten, wird die zweite Steuervorrichtung zwischen dem Signalgeber und die erste Steuervorrichtung geschaltet. Das Eingangssignal der ersten Steuervorrichtung wird dann nicht mehr direkt von dem Signalgeber am Bedienelement, sondern von der zweiten Steuervorrichtung geliefert.According to an expedient embodiment, the first control device and the second control device are designed as separate units. The first control device can thus be used unchanged for generic and control arrangements according to the invention. In order to obtain a control arrangement with the possibility of power reduction, the second control device is connected between the signal generator and the first control device. The input signal of the first control device is then no longer supplied directly by the signal generator on the operating element but by the second control device.

Ebenso ist es möglich, dass die zweite Steuervorrichtung und die erste Steuervorrichtung eine Baueinheit bilden. Beispielsweise können die beiden Steuervorrichtungen in einem gemeinsamen Gehäuse zusammengefasst sein.It is also possible that the second control device and the first control device form a structural unit. For example, the two control devices can be combined in a common housing.

Mit besonderem Vorteil ist das Ausgangssignal der zweiten Steuervorrichtung, welches der ersten Steuervorrichtung zugeführt wird, ein diskretes Ein/Aus-Signal. Dieses Ein/Aus-Signal gibt den gewünschten Zustand des Brenners vor, d.h., ob dieser ein- oder ausgeschaltet sein soll. Die erste Steuervorrichtung stellt dann den gewünschten Zustand des Brenners her. Wenn das Ausgangssignal der zweiten Steuervorrichtung fortlaufend wechselt, führt dies dazu, dass die erste Steuervorrichtung den Brenner entsprechend fortlaufend ein- und ausschaltet.With particular advantage, the output signal of the second control device, which is supplied to the first control device, a discrete on / off signal. This on / off signal indicates the desired state of the burner, i.e., whether it should be on or off. The first controller then establishes the desired state of the burner. When the output signal of the second control device continuously changes, this causes the first control device to continuously turn on and off the burner accordingly.

Gemäß einer anderen möglichen Ausgestaltungsform ist die zweite Steuervorrichtung über einen Datenbus mit der ersten Steuervorrichtung verbunden. Der Datenbus stellt eine definierte Schnittstelle zwischen den Steuervorrichtungen dar und ermöglicht es, neben dem Ein/ Aus-Signal auch weitere Informationen zu übertragen.According to another possible embodiment, the second control device is connected to the first control device via a data bus. The data bus represents a defined interface between the control devices and makes it possible to transmit other information in addition to the on / off signal.

Ein besonders günstiger Aufbau des Signalgebers wird erreicht, wenn der Signalgeber in Abhängigkeit von der Stellung des Bedienelements ein mehrstufiges diskretes Signal erzeugt. Die verschiedenen Stufen des mehrstufigen diskreten Signal können beispielsweise bedeuten: Brenner aus, Brenner ein ohne Leistungsreduzierung, Leistungsreduzierungsstufe 1, Leistungsreduzierungsstufe 2, usw. Das mehrstufige diskrete Signal kann beispielsweise dadurch erzeugt werden, indem in dem Signalgeber in Abhängigkeit von der Stellung des Bedienelements elektrische Widerstände geschaltet werden.A particularly favorable construction of the signal generator is achieved if the signal generator generates a multistage discrete signal as a function of the position of the operating element. The various stages of the multi-level discrete signal may mean, for example: burner off, burner on without power reduction, power reduction stage 1, power reduction stage 2, etc. The multi-stage discrete signal can for example be generated by electrical resistors are switched in the signal generator in dependence on the position of the control element.

Hierbei ist die zweite Steuervorrichtung derart ausgeführt, dass den betreffenden Stufen des diskreten Signals des Signalgebers ein bestimmtes Verhältnis zwischen Einschaltzeit und Ausschaltzeit des Brenners zugeordnet ist. Das Verhältnis zwischen Einschaltzeit und Ausschaltzeit bestimmt die über die Zeit gemittelte Brennleistung des Brenners.Here, the second control device is designed such that the respective stages of the discrete signal of the signal generator is assigned a specific ratio between the on-time and off-time of the burner. The ratio between on-time and off-time determines the averaged over the time burning power of the burner.

Mit besonderem Vorteil weist der Gasherd zwei oder mehr Brenner auf, für die eine gemeinsame erste Steuervorrichtung vorgesehen ist. Die erste Steuervorrichtung weist entsprechend viele elektrische Signaleingänge und Signalausgänge auf, um für jeden Brenner die genannten Funktionen getrennt steuern zu können.With particular advantage, the gas stove has two or more burners, for which a common first control device is provided. The first control device has correspondingly many electrical signal inputs and signal outputs in order to be able to control the functions mentioned separately for each burner.

Ebenso vorteilhaft ist es, wenn der Gasherd zwei oder mehr Bedienelemente mit elektrischen Signalgebern aufweist, die einer gemeinsamen zweiten Steuervorrichtung zugeordnet sind. Die Funktion der Leistungsreduzierung kann damit für mehrere Brenner mit einer einzigen zweiten Steuervorrichtung gesteuert werden. Die Eingangssignale von mehreren Signalgebern werden entsprechend in einer einzigen zweiten Steuervorrichtung ausgewertet.It is equally advantageous if the gas stove has two or more control elements with electrical signal transmitters which are assigned to a common second control device. The function of power reduction can thus be controlled for multiple burners with a single second control device. The input signals from a plurality of signal transmitters are correspondingly evaluated in a single second control device.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in der schematischen Figur dargestellten Ausführungsbeispiels näher erläutert.Further advantages and details of the invention will be explained in more detail with reference to the embodiment shown in the schematic figure.

Dargestellt ist eine erfindungsgemäße Steueranordnung für einen Gasherd mit einem Bedienelement (7), einem Mengenregelventil (2), einer ersten elektrischen Steuervorrichtung (11), einer zweiten elektrischen Steuervorrichtung (12), einem Zündmodul (16) sowie den zur Steueranordnung gehörenden elektrischen Leitungen. An dem Mengenregelventil (2) sind ein Absperrventil (3) und ein elektrischer Signalgeber (4) angeordnet. Im Bereich eines Gasbrenners (1) befinden sich ein Flammenwächter (5) und eine Zündelektrode (6). Der Übersichtlichkeit halber wurde auf die Darstellung von Gasleitungen verzichtet.Shown is a control arrangement according to the invention for a gas stove with a control element (7), a flow control valve (2), a first electrical control device (11), a second electrical control device (12), an ignition module (16) and belonging to the control arrangement electrical lines. At the flow control valve (2) a shut-off valve (3) and an electrical signal generator (4) are arranged. In the area of a gas burner (1) there is a flame detector (5) and an ignition electrode (6). For the sake of clarity, the presentation of gas lines has been omitted.

Mittels des Bedienelements (7) am Mengenregelventil (2) gibt die Bedienperson vor, ob der Brenner (1) ein- oder ausgeschaltet sein soll und welche Leistung der Brenner (1) abgeben soll. Hierbei steuert die Bedienperson mittels des Bedienelements (7) den Öffnungsquerschnitt des Mengenregelventils (2). Darüber hinaus wird die Stellung des Bedienelements (7) mittels des elektrischen Signalgebers (4) erfasst. Basierend auf dem elektrischen Ausgangssignal des Signalgebers (4) wird mittels der Steuervorrichtungen (11) und (12) der Brenner ein- und ausgeschaltet.By means of the operating element (7) on the quantity control valve (2), the operator specifies whether the burner (1) should be switched on or off and which output the burner (1) should deliver. Here, the operator controls by means of the operating element (7) the opening cross-section of the flow control valve (2). In addition, the position of the operating element (7) by means of the electrical signal transmitter (4) is detected. Based on the electrical output signal of the signal generator (4), the burner is switched on and off by means of the control devices (11) and (12).

Das Ausgangssignal des Signalgebers (4) besteht in einem elektrischen Widerstandswert, welcher von der zweiten Steuervorrichtung (12) gemessen wird. Dieses Widerstandssignal wird von der zweiten Steuervorrichtung (12) in ein digitales Ein/Aus-Signal umgesetzt, das der ersten Steuervorrichtung (11) zugeführt wird:
Wenn die Bedienperson den Brenner mittels des Bedienelements (7) ausgeschaltet hat, liefert der Signalgeber (4) ein entsprechendes Widerstandssignal, welches von der zweiten Steuervorrichtung in ein konstantes "Aus"-Signal umgesetzt wird. Die erste Steuervorrichtung (11) lässt den Brenner dabei ausgeschaltet, d.h., das Absperrventil (3) bleibt geschlossen und die Zündvorrichtung (16) wird nicht aktiviert.The output signal of the signal generator (4) consists of an electrical resistance, which is measured by the second control device (12). This resistance signal is converted by the second control device (12) into a digital on / off signal, which is supplied to the first control device (11):
When the operator has switched off the burner by means of the operating element (7), the signal generator (4) delivers a corresponding resistance signal, which is converted by the second control device into a constant "off" signal. The first control device (11) leaves the burner switched off, ie, the shut-off valve (3) remains closed and the ignition device (16) is not activated.

Wenn die Bedienperson den Brenner mittels des Bedienelements (7) auf eine Leistung einstellt, welche zwischen der maximalen und der minimalen Brennerleistung liegt, liefert der Signalgeber (4) einen zweiten Widerstandswert. Die zweite Steuervorrichtung (12) setzt diesen zweiten Widerstandswert in ein konstantes "Ein"-Signal um. Die erste Steuervorrichtung (11) öffnet daraufhin das Absperrventil (3), betätigt die Zündvorrichtung (16) und überwacht das Vorhandensein einer Flamme am Brenner (1) mittels des Flammenwächters (5). Die erste Steuervorrichtung schließt das Absperrventil (3) automatisch, wenn es nicht gelingt, eine Flamme am Brenner (1) zu entfachen, oder wenn die Flamme erlischt und erneute Zündversuche scheitern.When the operator adjusts the burner by means of the operating element (7) to a power which lies between the maximum and the minimum burner output, the signal generator (4) supplies a second resistance value. The second control device (12) converts this second resistance into a constant "on" signal. The first control device (11) then opens the shut-off valve (3), operates the ignition device (16) and monitors the presence of a flame on the burner (1) by means of the flame detector (5). The first control device closes the shut-off valve (3) automatically, if it fails to ignite a flame on the burner (1), or if the flame goes out and re-ignition attempts fail.

Wenn die Bedienperson die Leistung des Brenners (1) mittels des Bedienelements (7) auf einen Wert einstellt, der geringer ist als die bauartbedingt minimale Brennerleistung, liefert der Signalgeber (4) einen dritten Widerstandswert. Der dritte Widerstandswert wird von der zweiten Steuervorrichtung (12) derart umgesetzt, dass der ersten Steuervorrichtung (11) abwechselnd ein "Ein"-Signal und ein "Aus"-Signal zugeführt wird. Dies führt dazu, dass die erste Steuervorrichtung (11) den Brenner fortlaufend ein- und ausschaltet. Hierbei steuert die Steuervorrichtung (11) selbsttätig das Öffnen und Schließen des Absperrventils (3) und das Zünden der Flamme mittels der Zündvorrichtung. Das Mengenregelventil (2) ist in dieser Betriebsart auf minimale Brennerleistung eingestellt.When the operator adjusts the output of the burner (1) to a value lower than the minimum burner output by means of the control element (7), the signal generator (4) supplies a third resistance value. The third resistance value is converted by the second control device (12) in such a way that an "on" signal and an "off" signal are alternately supplied to the first control device (11). This leads to, the first control device (11) continuously switches the burner on and off. In this case, the control device (11) automatically controls the opening and closing of the shut-off valve (3) and the ignition of the flame by means of the ignition device. The flow control valve (2) is set to minimum burner power in this mode.

Für den Betrieb des Brenners mit einer Leistung, die geringer ist als die bauartbedingt minimale Brennerleistung, können mehrere Leistungsstufen vorgesehen sein, die mittels des Bedienelements (7) vorgebbar sind. Hierbei ist im Signalgeber (4) jeder Leistungsstufe ein bestimmter Widerstandswert zugeordnet. Die Wärmeabgabeleistung des Brenners wird von der zweiten Steuervorrichtung (12) dann entsprechend durch das Verhältnis der Einschaltzeit zur Ausschaltzeit des Brenners gesteuert. Denkbar ist beispielsweise eine stufenweise Variation des Verhältnisses der Einschaltzeit zur Ausschaltzeit zwischen 80:20 und 20:80.For the operation of the burner with a power that is lower than the design minimum burner power, more power levels can be provided, which can be specified by means of the control element (7). Here, in the signal generator (4) each power level assigned a certain resistance value. The heat output of the burner is then controlled by the second control device (12) in accordance with the ratio of the on time to the off time of the burner. For example, a stepwise variation of the ratio of the switch-on time to the switch-off time between 80:20 and 20:80 is conceivable.

Anstelle eines ein diskretes Stufensignal liefernden Signalgebers (4) kann auch ein kontinuierlich arbeitender Signalgeber, beispielsweise ein Potentiometer, verwendet werden. Das Verhältnis der Einschaltzeit zur Ausschaltzeit kann dann durch die zweite Steuervorrichtung (12) stufenlos variiert werden. Der Betriebszustand, in dem der Brenner kontinuierlich brennt, kann bei Verwendung eines kontinuierlich arbeitenden Signalgebers durch einen unteren und einen oberen Grenzwert für das Ausgangssignal des Signalgebers definiert sein.Instead of a signal generator (4) delivering a discrete step signal, it is also possible to use a continuously operating signal generator, for example a potentiometer. The ratio of the switch-on time to the switch-off time can then be varied steplessly by the second control device (12). The operating state in which the burner burns continuously can be defined by a lower and an upper limit for the output signal of the signal generator when using a continuous signal generator.

Claims (13)

  1. Control arrangement for a gas stove having at least one gas burner (1), with the control arrangement comprising:
    - at least one control element (7) for switching the gas burner (1) on and off,
    - at least one signal transducer (4), which generates a signal dependent on the position of the control element (1),
    - at least one first control apparatus (11), which controls an ignition or extinguishing of a flame on the gas burner (1) as a function of the signal of the signal transducer,
    characterised in that
    a second control apparatus (12) is arranged between the signal transducer (4) and the first control apparatus (11), said second control apparatus (12) being embodied such that if a reduction in power of the burner to below a minimum burner power with a constantly small flame is predetermined with the signal of the signal transducer, a signal simulating a continuous switching on and off is fed by means of the control element (7).
  2. Control arrangement according to claim 1, characterised in that at least one flow control valve (2) with a variable flow cross-section is provided, which can be actuated with the control element (7).
  3. Control arrangement according to claim 1 or 2, characterised in that at least one flame monitor (5) is provided, which, as a function of the presence of a flame on the gas burner (1), generates a signal which is fed to the first control apparatus (11).
  4. Control arrangement according to one of claims 1 to 3, characterised in that at least one shut-off valve (3) is provided which can be actuated by the first control apparatus (11).
  5. Control arrangement according to one of claims 1 to 4, characterised in that at least one ignition apparatus (16) is provided for the gas burner (1), which can be controlled by the first control apparatus (11).
  6. Control arrangement according to one of claims 1 to 5, characterised in that the first control apparatus (11) and the second control apparatus (12) are embodied as separate modules.
  7. Control arrangement according to one of claims 1 to 6, characterised in that the second control apparatus (12) and the first control apparatus (11) form a module.
  8. Control arrangement according to one of claims 1 to 7, characterised in that the output signal of the second control apparatus, which is fed to the first control apparatus (11) is a discrete on/off signal.
  9. Control arrangement according to one of claims 1 to 8, characterised in that the second control apparatus (12) is connected to the first control apparatus (11) by way of a data bus.
  10. Control arrangement according to one of claims 1 to 9, characterised in that the signal transducer (4) generates a multistage discrete signal as a function of the position of the control element (7).
  11. Control arrangement according to one of claims 1 to 10, characterised in that the second control apparatus (12) is embodied such that a certain ratio between the switch-on time and the switch-off time of the gas burner (1) is assigned to the stages of the discrete signal of the signal transducer (4).
  12. Control arrangement according to one of claims 1 to 11, characterised in that the gas stove comprises two or more gas burners (1), for which a common first control apparatus (11) is provided.
  13. Control arrangement according to one of claims 1 to 12, characterised in that the gas stove has two or more control elements (7) with signal transducers (4), which are assigned to a common second control apparatus (12).
EP08760867.5A 2007-06-21 2008-06-11 Control arrangement for a gas stove Active EP2160541B1 (en)

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ES200701823A ES2310491B1 (en) 2007-06-21 2007-06-21 COMMAND PROVISION FOR A GAS KITCHEN.
PCT/EP2008/057318 WO2008155278A2 (en) 2007-06-21 2008-06-11 Control arrangement for a gas stove

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ES2310491B1 (en) 2009-10-27
US20100180882A1 (en) 2010-07-22
WO2008155278A3 (en) 2009-11-12
EP2160541A2 (en) 2010-03-10
WO2008155278A2 (en) 2008-12-24
US8353281B2 (en) 2013-01-15
ES2310491A1 (en) 2009-01-01
ES2694022T3 (en) 2018-12-17

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