EP0505714A2 - Control device for a gas burner with a fan for supplying combustion air - Google Patents

Control device for a gas burner with a fan for supplying combustion air Download PDF

Info

Publication number
EP0505714A2
EP0505714A2 EP92102550A EP92102550A EP0505714A2 EP 0505714 A2 EP0505714 A2 EP 0505714A2 EP 92102550 A EP92102550 A EP 92102550A EP 92102550 A EP92102550 A EP 92102550A EP 0505714 A2 EP0505714 A2 EP 0505714A2
Authority
EP
European Patent Office
Prior art keywords
gas
temperature
combustion air
control
control device
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
EP92102550A
Other languages
German (de)
French (fr)
Other versions
EP0505714B1 (en
EP0505714A3 (en
Inventor
Franz Dipl.-Ing. Schmuker
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0505714A2 publication Critical patent/EP0505714A2/en
Publication of EP0505714A3 publication Critical patent/EP0505714A3/en
Application granted granted Critical
Publication of EP0505714B1 publication Critical patent/EP0505714B1/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
    • 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
    • F23N5/04—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bimetallic elements
    • F23N5/047—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bimetallic elements using mechanical means
    • 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
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • 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
    • 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
    • F23N2235/12—Fuel valves
    • 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
    • F23N2235/20—Membrane valves
    • 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 control device for gas burners with a fan for supplying combustion air according to the preamble of the main claim.
  • the setpoint generator for the gas control valve is a throttle orifice arranged in the air volume flow, the opening cross section of which is fixed in an unchangeable manner.
  • the gas volume flow is controlled as a function of the conveyed air volume flow, but it is not taken into account that the density and thus the oxygen mass of the air volume flow is dependent on its temperature and can therefore also adversely affect the quality of combustion.
  • the ratio of the combustion air mass to the fuel gas mass must be kept constant. If the combustion gas temperature is constant and the combustion air temperature changes, this cannot be achieved with a fixed throttle orifice, because this cannot compensate for the temperature-dependent change in density of the air volume flow.
  • the combustion air is heated in a recuperator downstream of a measuring orifice controlling the gas control valve.
  • a measuring orifice is installed in the fuel gas line downstream of the gas control valve and the gas pressure behind this measuring orifice is fed back to the gas control valve as a correction signal.
  • the temperature of the combustion air upstream of the measuring orifice provided in the combustion air line is also not taken into account, in spite of an increased expenditure on apparatus, so that here too a constant excess of air cannot be maintained at different combustion air temperatures.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that, with a corresponding design of the setpoint generator and the gas control valve, the excess air can be adjusted to the optimum value over the entire controlled power range, taking the combustion air temperature into account automatically.
  • the setpoint generator for the gas control valve is a control pressure orifice in the combustion air line that generates differential pressure, the effective cross section of which is controlled as a function of temperature.
  • the arrangement can be such that the cross-section increases with increasing temperature of the air volume flow and thereby the control pressure difference in Meaning a lowering of the setpoint of the gas control valve is reduced.
  • the flow resistance of the control pressure orifice is also reduced, so that this effect also changes the air volume flow compared to the gas volume flow in the desired sense.
  • the effective cross section of the control pressure orifice can advantageously be influenced by at least one control flap which is coupled to a temperature-sensitive actuator which is acted upon by the air volume flow.
  • bimetal element is provided as an actuator for the control flap.
  • the bimetallic element can itself be designed as a control flap and attached directly to the panel.
  • a bellows filled with expansion liquid or, for example, a wax expansion element can also be provided.
  • the measuring location can be located away from the actuator.
  • the temperature of the combustion air can also be detected by electronic means that act on an electromechanical actuator, such as a magnet or motor.
  • a control pressure orifice has an uncontrolled main opening and at least one temperature-controlled secondary opening.
  • This is expediently associated with a control flap designed directly as a bimetallic element.
  • the control characteristic can be adapted to the requirements of the respective application by appropriately selecting the dimensions of the control openings.
  • the control characteristic can also be adapted by means of stepped prestressing of the bimetallic elements.
  • control device can be used both in systems or devices with forced draft burners and in devices with atmospheric gas burners, which are provided with a fan to support the combustion air supply.
  • the temperature-dependent throttling of the air volume flow according to the invention can also be used to achieve an excess air during combustion that is independent of the temperature of the combustion air.
  • the control pressure orifices described above can also be used for this purpose.
  • FIG. 1 shows an overall schematic view of the burner device for a gas-heated water heater
  • FIG. 2 shows the side view of a control pressure orifice of the device according to FIG. 1
  • FIG. 3 shows a section along the line III-III in FIG. 2.
  • the burner device has a fan 10 for supplying combustion air, the speed of which is controlled in accordance with the heat requirement.
  • the fan 10 conveys the combustion air into a channel 12, into which a gas line 16 supplying the fuel gas opens at the point 14.
  • the channel 12 leads into a distribution chamber 18 of a premix burner 20, from which the fuel-air mixture passes through a perforated plate 22 to the combustion zone 24 of the premix burner 20, evenly distributed.
  • the combustion takes place in a combustion chamber 26, which is arranged between the premix burner 20 and a heat exchanger, which is no longer shown, for the water to be heated.
  • a control pressure orifice 30 is installed in the channel 12 upstream of the point 14 and forms a setpoint generator for a gas pressure regulator 32 in the gas line 16.
  • the control pressure orifice 30 derives a differential pressure from the air volume flow in the duct 12, which is transmitted to the gas pressure regulator 32 as a control variable via lines 34, 36.
  • the control pressure orifice 30 and the gas pressure regulator 32 are designed in such a way that a constant excess of air in the fuel-air mixture results over a predetermined power range of the premix burner 20 for a predetermined normal value of the combustion air temperature.
  • the control pressure orifice 30 is also designed according to the invention so that it also detects the temperature of the combustion air and controls the setpoint of the gas pressure regulator 32 depending on the temperature so that there is a constant excess of air even at different temperatures of the combustion air.
  • the control pressure orifice 30 is provided, in addition to a main opening 38 with an unchangeable opening cross section, with a secondary opening 40, the opening cross section of which can be changed by a control flap 42 which is adjustable as a function of temperature.
  • the control flap 42 is designed as a bimetallic strip which is attached directly to the control pressure orifice 30 and is thus exposed to the temperature of the combustion air.
  • the openings 38, 40 in the control pressure orifice 30 and the control flap 42 are dimensioned or designed and matched to one another such that the ratio of air mass to gas mass is approximately the same at all temperatures of the combustion air occurring in practice within a predetermined performance range of the premix burner 20. so that the excess air is almost constant in this performance range.

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)

Abstract

In a known control device of the generic type, the set-point adjuster (30) of the gas control valve (32) detects only the volume flow of the combustion air but not its temperature. This can lead to a reduction in the combustion quality, if the temperature of the combustion air deviates significantly from a normal value used as a basis in the design of the control device. As a result of the further function, assigned to the set-point adjuster (30) of the gas control valve (32), of detection of the temperature of the combustion air and temperature-dependent control of the set-point, it can be simply achieved that, at all temperatures occurring in practice of the combustion air within a predetermined capacity range of the gas burner (20), the ratio of air mass to gas mass and thus the excess air can be kept virtually constant. Preferred area of application is control devices for premix-type burners in gas-fired water heaters. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Regelvorrichtung für Gasbrenner mit einem Gebläse zum Zuführen von Verbrennungsluft nach der Gattung des Hauptanspruchs. Bei einer bekannten Regelvorrichtung dieser Gattung (DE-A1 31 05 862) ist der Sollwertgeber für das Gasregelventil eine im Luftvolumenstrom angeordnete Drosselblende, deren Öffnungsquerschnitt unveränderbar festgelegt ist. Bei dieser Anordnung wird zwar der Gasvolumenstrom abhängig vom geförderten Luftvolumenstrom gesteuert, jedoch bleibt unberücksichtigt, daß die Dichte und damit die Sauerstoffmasse des Luftvolumenstroms abhängig von dessen Temperatur ist und diese daher die Verbrennungsgüte auch nachteilig beeinflussen kann. Für einen konstanten Luftüberschuß bei der Verbrennung muß das Verhältnis von Verbrennungsluftmasse zu Brenngasmasse konstant gehalten werden. Bei konstanter Brenngastemperatur und veränderlicher Verbrennungslufttemperatur gelingt das mit einer fest eingestellten Drosselblende jedoch nicht, weil diese die temperaturabhängige Dichteänderung des Luftvolumenstroms nicht kompensieren kann.The invention relates to a control device for gas burners with a fan for supplying combustion air according to the preamble of the main claim. In a known control device of this type (DE-A1 31 05 862), the setpoint generator for the gas control valve is a throttle orifice arranged in the air volume flow, the opening cross section of which is fixed in an unchangeable manner. In this arrangement, the gas volume flow is controlled as a function of the conveyed air volume flow, but it is not taken into account that the density and thus the oxygen mass of the air volume flow is dependent on its temperature and can therefore also adversely affect the quality of combustion. For a constant excess of air during combustion, the ratio of the combustion air mass to the fuel gas mass must be kept constant. If the combustion gas temperature is constant and the combustion air temperature changes, this cannot be achieved with a fixed throttle orifice, because this cannot compensate for the temperature-dependent change in density of the air volume flow.

Bei einer anderen Regelvorrichtung der eingangs genannten Art (DE-A1 30 06 683) wird die Verbrennungsluft stromab einer das Gasregelventil steuernden Meßblende in einem Rekuperator erwärmt. Um einer möglichen Erwärmung des Brenngases durch den Gasbrenner Rechnung zu tragen, ist stromab des Gasregelventils eine Meßblende in die Brenngasleitung eingebaut und der Gasdruck hinter dieser Meßblende als Korrektursignal an das Gasregelventil zurückgeführt. Bei dieser bekannten Anordnung wird jedoch trotz eines erhöhten apparativen Aufwands die Temperatur der Verbrennungsluft stromauf der in der Verbrennungsluftleitung vorgesehenen Meßblende ebenfalls nicht berücksichtigt, so daß auch hier ein konstanter Luftüberschuß bei unterschiedlichen Verbrennungslufttemperaturen nicht eingehalten werden kann.In another control device of the type mentioned at the beginning (DE-A1 30 06 683), the combustion air is heated in a recuperator downstream of a measuring orifice controlling the gas control valve. In order to take into account possible heating of the fuel gas by the gas burner, a measuring orifice is installed in the fuel gas line downstream of the gas control valve and the gas pressure behind this measuring orifice is fed back to the gas control valve as a correction signal. In this known arrangement, however, the temperature of the combustion air upstream of the measuring orifice provided in the combustion air line is also not taken into account, in spite of an increased expenditure on apparatus, so that here too a constant excess of air cannot be maintained at different combustion air temperatures.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß bei entsprechender Auslegung des Sollwertgebers und des Gasregelventils der Luftüberschuß über den gesamten gesteuerten Leistungsbereich unter selbsttätiger Berücksichtigung der Verbrennungslufttemperatur auf den optimalen Wert eingeregelt werden kann.The arrangement according to the invention with the characterizing features of the main claim has the advantage that, with a corresponding design of the setpoint generator and the gas control valve, the excess air can be adjusted to the optimum value over the entire controlled power range, taking the combustion air temperature into account automatically.

Durch die in den Unteransprüchen enthaltenen Maßnahmen sind vorteilhafte Weiterbildungen der Anordnung nach dem Hauptanspruch möglich.The measures contained in the subclaims allow advantageous developments of the arrangement according to the main claim.

Eine einfache und ohne zusätzliche Einbauten in der Verbrennungsluftleitung auskommende Ausführung ergibt sich, wenn der Sollwertgeber für das Gasregelventil eine differenzdruckerzeugende Steuerdruckblende in der Verbrennungsluftleitung ist, deren wirksamer Querschnitt temperaturabhängig gesteuert ist. Die Anordnung kann so getroffen sein, daß mit zunehmender Temperatur des Luftvolumenstroms der Querschnitt vergrößert und dadurch die Steuerdruckdifferenz im Sinne einer Absenkung des Sollwerts des Gasregelventils verringert wird. Dabei verringert sich auch der Strömungswiderstand der Steuerdruckblende, so daß sich auch durch diesen Effekt der Luftvolumenstrom gegenüber dem Gasvolumenstrom im gewünschten Sinn verändert.A simple design that does not require any additional internals in the combustion air line is obtained if the setpoint generator for the gas control valve is a control pressure orifice in the combustion air line that generates differential pressure, the effective cross section of which is controlled as a function of temperature. The arrangement can be such that the cross-section increases with increasing temperature of the air volume flow and thereby the control pressure difference in Meaning a lowering of the setpoint of the gas control valve is reduced. The flow resistance of the control pressure orifice is also reduced, so that this effect also changes the air volume flow compared to the gas volume flow in the desired sense.

Der wirksame Querschnitt der Steuerdruckblende kann vorteilhaft von mindestens einer Steuerklappe beeinflußt sein, die mit einem vom Luftvolumenstrom beaufschlagten temperaturempfindlichen Stellglied gekopppelt ist.The effective cross section of the control pressure orifice can advantageously be influenced by at least one control flap which is coupled to a temperature-sensitive actuator which is acted upon by the air volume flow.

Eine einfache Anordnung ergibt sich, wenn als Stellglied für die Steuerklappe ein Bimetallelement vorgesehen ist. Das Bimetallelement kann selbst als Steuerklappe ausgebildet und unmittelbar an der Blende befestigt sein.A simple arrangement results if a bimetal element is provided as an actuator for the control flap. The bimetallic element can itself be designed as a control flap and attached directly to the panel.

Anstelle eines Bimetallelements als Stellglied kann auch ein mit Ausdehnungsflüssigkeit gefüllter Balg oder beispielsweise ein Wachsdehnelement vorgesehen sein. In diesen Fällen kann der Meßort entfernt vom Stellorgan angeordnet werden. Die Temperatur der Verbrennungsluft kann auch durch elektronische Mittel erfaßt werden, die auf ein elektromechanisches Stellglied, wie Magnet oder Motor, einwirken.Instead of a bimetal element as an actuator, a bellows filled with expansion liquid or, for example, a wax expansion element can also be provided. In these cases, the measuring location can be located away from the actuator. The temperature of the combustion air can also be detected by electronic means that act on an electromechanical actuator, such as a magnet or motor.

Bei einer bevorzugten Ausführungsform der Erfindung hat eine Steuerdruckblende eine ungesteuerte Hauptöffnung und mindestens eine temperaturabhängig gesteuerte Nebenöffnung. Dieser ist zweckmäßig eine unmittelbar als Bimetallelement ausgebildete Steuerklappe zugeordnet. Durch entsprechende Wahl der Abmessungen der Steueröffnungen kann die Steuercharakteristik den Anforderungen des jeweiligen Anwendungsfalles angepaßt werden. Bei Anordnung von zwei oder mehr Bimetallelementen bzw. Steuerklappen kann die Steuercharakteristik auch durch gestufte Vorspannung der Bimetallelemente angepaßt werden.In a preferred embodiment of the invention, a control pressure orifice has an uncontrolled main opening and at least one temperature-controlled secondary opening. This is expediently associated with a control flap designed directly as a bimetallic element. The control characteristic can be adapted to the requirements of the respective application by appropriately selecting the dimensions of the control openings. When two or more bimetallic elements or control flaps are arranged, the control characteristic can also be adapted by means of stepped prestressing of the bimetallic elements.

Die erfindungsgemäße Regelvorrichtung kann sowohl in Anlagen bzw. Geräten mit Gebläsebrennern als auch in Geräten mit atmosphärischen Gasbrennern eingesetzt werden, die zur Unterstützung der Verbrennungsluftzufuhr mit einem Gebläse versehen sind.The control device according to the invention can be used both in systems or devices with forced draft burners and in devices with atmospheric gas burners, which are provided with a fan to support the combustion air supply.

Bei einem Heizgerät ohne pneumatischen Verbundregler kann durch die erfindungsgemäße temperaturahbängige Drosselung des Luftvolumenstroms ebenfalls ein von der Temperatur der Verbrennungsluft unabhängiger Luftüberschuß bei der Verbrennung erreicht werden. Auch für diesen Zweck können die vorbeschriebenen Steuerdruckblenden eingesetzt werden.In the case of a heater without a pneumatic compound controller, the temperature-dependent throttling of the air volume flow according to the invention can also be used to achieve an excess air during combustion that is independent of the temperature of the combustion air. The control pressure orifices described above can also be used for this purpose.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine schematische Gesamtansicht der Brennereinrichtung für einen gasbeheizten Wassererhitzer, Figur 2 die Seitenansicht einer Steuerdruckblende der Einrichtung nach Figur 1 und Figur 3 einen Schnitt nach der Linie III-III in Figur 2.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows an overall schematic view of the burner device for a gas-heated water heater, FIG. 2 shows the side view of a control pressure orifice of the device according to FIG. 1, and FIG. 3 shows a section along the line III-III in FIG. 2.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Brennereinrichtung hat ein Gebläse 10 zum Zuführen von Verbrennungsluft, dessen Drehzahl der Wärmeanforderung entsprechend gesteuert ist. Das Gebläse 10 fördert die Verbrennungsluft in einen Kanal 12, in welchen an der Stelle 14 eine das Brenngas zuführende Gasleitung 16 einmündet. Der Kanal 12 führt in eine Verteilerkammer 18 eines Vormischbrenners 20, aus welcher das Brennstoff-Luftgemisch durch ein Lochblech 22 gleichmäßig verteilt zur Brennzone 24 des Vormischbrenners 20 gelangt. Die Verbrennung erfolgt in einer Brennkammer 26, die zwischen dem Vormischbrenner 20 und einem nicht mehr dargestellten Wärmeübertrager für das zu erhitzende Wasser angeordnet ist.The burner device has a fan 10 for supplying combustion air, the speed of which is controlled in accordance with the heat requirement. The fan 10 conveys the combustion air into a channel 12, into which a gas line 16 supplying the fuel gas opens at the point 14. The channel 12 leads into a distribution chamber 18 of a premix burner 20, from which the fuel-air mixture passes through a perforated plate 22 to the combustion zone 24 of the premix burner 20, evenly distributed. The combustion takes place in a combustion chamber 26, which is arranged between the premix burner 20 and a heat exchanger, which is no longer shown, for the water to be heated.

In den Kanal 12 ist stromauf der Stelle 14 eine Steuerdruckblende 30 eingebaut, die einen Sollwertgeber für einen Gasdruckregler 32 in der Gasleitung 16 bildet. Die Steuerdruckblende 30 leitet aus dem Luftvolumenstrom im Kanal 12 einen Differenzdruck ab, der über Leitungen 34, 36 als Steuergröße an den Gasdruckregler 32 übertragen wird. Die Steuerdruckblende 30 und der Gasdruckregler 32 sind wie bekannt so ausgebildet, daß sich über einen vorgegebenen Leistungsbereich des Vormischbrenners 20 für einen vorgegebenen Normalwert der Verbrennungslufttemperatur ein konstanter Luftüberschuß im Brennstoff-Luftgemisch ergibt.A control pressure orifice 30 is installed in the channel 12 upstream of the point 14 and forms a setpoint generator for a gas pressure regulator 32 in the gas line 16. The control pressure orifice 30 derives a differential pressure from the air volume flow in the duct 12, which is transmitted to the gas pressure regulator 32 as a control variable via lines 34, 36. As is known, the control pressure orifice 30 and the gas pressure regulator 32 are designed in such a way that a constant excess of air in the fuel-air mixture results over a predetermined power range of the premix burner 20 for a predetermined normal value of the combustion air temperature.

Die Steuerdruckblende 30 ist darüber hinaus erfindungsgemäß so ausgebildet, daß sie auch die Temperatur der Verbrennungsluft erfaßt und den Sollwert des Gasdruckreglers 32 temperaturabhängig so steuert, daß sich ein konstanter Luftüberschuß auch bei unterschiedlichen Temperaturen der Verbrennungsluft ergibt. Zu diesem Zweck ist die Steuerdruckblende 30 neben einer Hauptöffnung 38 mit unveränderlichem Öffnungsquerschnitt mit einer Nebenöffnung 40 versehen, deren Öffnungsquerschnitt durch eine temperaturabhängig verstellbare Steuerklappe 42 veränderbar ist. Die Steuerklappe 42 ist als Bimetallstreifen ausgebildet, der unmittelbar an der Steuerdruckblende 30 befestigt und so der Temperatur der Verbrennungsluft ausgesetzt ist.The control pressure orifice 30 is also designed according to the invention so that it also detects the temperature of the combustion air and controls the setpoint of the gas pressure regulator 32 depending on the temperature so that there is a constant excess of air even at different temperatures of the combustion air. For this purpose, the control pressure orifice 30 is provided, in addition to a main opening 38 with an unchangeable opening cross section, with a secondary opening 40, the opening cross section of which can be changed by a control flap 42 which is adjustable as a function of temperature. The control flap 42 is designed as a bimetallic strip which is attached directly to the control pressure orifice 30 and is thus exposed to the temperature of the combustion air.

Die Öffnungen 38, 40 in der Steuerdruckblende 30 und die Steuerklappe 42 sind so bemessen bzw. ausgebildet und aufeinander abgestimmt, daß bei allen in der Praxis vorkommenden Temperaturen der Verbrennungsluft innerhalb eines vorgegebenen Leistungsbereichs des Vormischbrenners 20 das Verhältnis von Luftmasse zu Gasmasse annähernd gleich ist, so daß in diesem Leistungsbereich auch der Luftüberschuß annähernd konstant ist.The openings 38, 40 in the control pressure orifice 30 and the control flap 42 are dimensioned or designed and matched to one another such that the ratio of air mass to gas mass is approximately the same at all temperatures of the combustion air occurring in practice within a predetermined performance range of the premix burner 20. so that the excess air is almost constant in this performance range.

Claims (8)

Regelvorrichtung für Gasbrenner mit einem Gebläse zum Zuführen von Verbrennungsluft, mit einem stromab des Gebläses angeordneten, aus dem Luftvolumenstrom eine Steuergröße ableitenden Sollwertgeber für ein Gasregelventil, das innerhalb eines vorgegebenen Brennerleistungsbereichs das Mischungsverhältnis von Brenngas und Verbrennungsluft im Sinne einer Optimierung der Verbrennung steuert, dadurch gekennzeichnet, daß der Sollwertgeber (30) für das Gasregelventil (32) auch die Temperatur der Verbrennungsluft erfaßt und den Sollwert temperaturabhängig so steuert, daß mit steigender Temperatur der Verbrennungsluft der Volumenanteil des Brenngases am Gesamtvolumen des Brenngas-Luftgemisches abnimmt und umgekehrt.Control device for gas burners with a blower for supplying combustion air, with a setpoint generator for a gas control valve which is arranged downstream of the blower and derives a control variable from the air volume flow and which controls the mixture ratio of fuel gas and combustion air within a predetermined burner output range in order to optimize combustion that the setpoint generator (30) for the gas control valve (32) also detects the temperature of the combustion air and controls the setpoint as a function of temperature so that the volume fraction of the fuel gas in the total volume of the fuel gas / air mixture decreases as the temperature of the combustion air rises, and vice versa. Regelvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Sollwertgeber des Gasregelventils (32) eine differenzdruckerzeugende Steuerdruckblende (30) in einer zum Gasbrenner (20) führenden Verbrennungsluftleitung (12) hat, deren wirksamer Querschnitt temperaturabhängig gesteuert ist.Control device according to Claim 1, characterized in that the setpoint generator of the gas control valve (32) has a control pressure orifice (30) which generates differential pressure in a combustion air line (12) leading to the gas burner (20), the effective cross section of which is controlled as a function of temperature. Regelvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der wirksame Querschnitt der Steuerdruckblende (30) von mindestens einer Steuerklappe (42) beeinflußt ist, die mit einem vom Luftvolumenstrom beaufschlagten temperaturempfindlichen Stellglied gekoppelt ist.Control device according to claim 2, characterized in that the effective cross section of the control pressure orifice (30) is influenced by at least one control flap (42) which is coupled to a temperature-sensitive actuator acted upon by the air volume flow. Regelvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das temperaturempfindliche Stellglied (42) ein Bimetallelement ist.Control device according to claim 3, characterized in that the temperature-sensitive actuator (42) is a bimetallic element. Regelvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Bimetallelement (42) selbst die Steuerklappe bildet.Control device according to claim 4, characterized in that the bimetal element (42) itself forms the control flap. Regelvorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Steuerdruckblende (30) eine ungesteuerte Hauptöffnung (38) und mindestens eine temperaturgesteuerte Nebenöffnung (40) hat.Control device according to one of claims 2 to 5, characterized in that the control pressure orifice (30) has an uncontrolled main opening (38) and at least one temperature-controlled secondary opening (40). Regelvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Gasregelventil (32) ein differenzdruckgesteuerter Gasdruckregler ist.Control device according to one of the preceding claims, characterized in that the gas control valve (32) is a gas pressure regulator controlled by differential pressure. Regelvorrichtung für Gasbrenner mit einem Gebläse zum Zuführen von Verbrennungsluft, einem Gasstellglied in einer zum Brenner führenden Brenngasleitung, und mit von einem Wärmebedarfssignal gesteuerten Stellgliedern für die Verbrennungsluft- und Brenngaszufuhr, dadurch gekennzeichnet, daß stromab des Gebläses eine den Luftvolumenstrom abhängig von dessen Temperatur steuernde Blende vorgesehen ist.Control device for gas burners with a fan for supplying combustion air, a gas actuator in a fuel gas line leading to the burner, and with actuators for the supply of combustion air and fuel gas controlled by a heat demand signal, characterized in that downstream of the fan there is an orifice controlling the air volume flow depending on its temperature is provided.
EP92102550A 1991-03-26 1992-02-15 Control device for a gas burner with a fan for supplying combustion air Expired - Lifetime EP0505714B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4109841A DE4109841C2 (en) 1991-03-26 1991-03-26 Control device for gas burners with a fan for supplying combustion air
DE4109841 1991-03-26

Publications (3)

Publication Number Publication Date
EP0505714A2 true EP0505714A2 (en) 1992-09-30
EP0505714A3 EP0505714A3 (en) 1993-03-03
EP0505714B1 EP0505714B1 (en) 1996-01-24

Family

ID=6428195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92102550A Expired - Lifetime EP0505714B1 (en) 1991-03-26 1992-02-15 Control device for a gas burner with a fan for supplying combustion air

Country Status (3)

Country Link
EP (1) EP0505714B1 (en)
DE (2) DE4109841C2 (en)
PT (1) PT100296B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0769399A2 (en) * 1995-10-19 1997-04-23 WEBASTO THERMOSYSTEME GmbH Vehicle heating device
NL1006559C2 (en) * 1997-07-11 1999-01-12 Vries Metaal Bv Regulation of fuel supply to a heating appliance.
EP1116916A1 (en) * 2000-01-11 2001-07-18 Robert Bosch Gmbh Gas heating appliance with pneumatically controlled premix-burner
US20140124587A1 (en) * 2012-11-05 2014-05-08 Pat Caruso Modulating burner system

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4343306A1 (en) * 1993-12-17 1995-06-22 Gastechnic Prod Vertriebges Gas pipeline pressure regulation system
EP0724117B1 (en) 1995-01-30 1998-07-08 Landis &amp; Gyr Technology Innovation AG Control device for a gas power burner
DE29504705U1 (en) 1995-03-24 1996-07-25 Robert Bosch Gmbh, 70469 Stuttgart Control device for a burner with a fan for the combustion air
DE19510425C2 (en) * 1995-03-24 1999-05-27 Bosch Gmbh Robert Method and device for controlling a heater
DE19711140A1 (en) * 1997-03-18 1998-06-04 Bosch Gmbh Robert Method for operating burner with mixture of fuel and air
DE19853573A1 (en) * 1998-11-20 2000-05-25 Bosch Gmbh Robert heater
DE19943612B4 (en) * 1999-09-11 2004-07-15 Robert Bosch Gmbh Method for operating a gas burner with modulating burner output
DE10119598C2 (en) * 2001-04-21 2003-10-02 Bosch Gmbh Robert Device for mixing gas and air for a gas heater
DE10303081B3 (en) * 2003-01-27 2004-07-29 Webasto Thermosysteme International Gmbh Auxiliary heating device for automobile with adjustment of fuel/air mixture supplied to burner in dependence on measured temperature of fuel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2607286A1 (en) * 1976-02-23 1977-09-01 Tuezelestechnikai Kutatointez Combined air flow regulator for fireplaces - has divided flow paths provided with bimetallic flow cross section regulator
DE3105862A1 (en) * 1981-02-18 1982-09-09 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Gas blower burner
DE3238682A1 (en) * 1982-10-19 1984-04-19 Kutzner, Luitpold, 8031 Maisach Shut-off device in the waste gas flue of a fireplace
DE3006683C2 (en) * 1980-02-22 1988-08-11 G. Kromschroeder Ag, 4500 Osnabrueck, De
JPH1114617A (en) * 1997-06-24 1999-01-22 Kdk Corp Specimen for liquid sample and its manufacture

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708858C2 (en) * 1977-03-01 1986-04-24 Caloric Gesellschaft für Apparatebau mbH, 8032 Gräfelfing Control device for a burner for flowable fuels
DE2735719A1 (en) * 1977-08-08 1979-02-15 Tuezelestechnikai Kutatointez Fireplace combustion air flow control - is actuated by fuel supply and uses bimetallic air temp. sensor
DE3125513A1 (en) * 1981-06-29 1983-01-13 Siemens AG, 1000 Berlin und 8000 München Method of operating a gasification burner/heating boiler installation
DE3812697A1 (en) * 1988-04-16 1989-12-28 Programmelectronic Eng Ag METHOD FOR REDUCING THE INTERFERENCE EFFECT IN FAN BURNER PLANTS AND FAN BURNER PLANT

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2607286A1 (en) * 1976-02-23 1977-09-01 Tuezelestechnikai Kutatointez Combined air flow regulator for fireplaces - has divided flow paths provided with bimetallic flow cross section regulator
DE3006683C2 (en) * 1980-02-22 1988-08-11 G. Kromschroeder Ag, 4500 Osnabrueck, De
DE3105862A1 (en) * 1981-02-18 1982-09-09 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Gas blower burner
DE3238682A1 (en) * 1982-10-19 1984-04-19 Kutzner, Luitpold, 8031 Maisach Shut-off device in the waste gas flue of a fireplace
JPH1114617A (en) * 1997-06-24 1999-01-22 Kdk Corp Specimen for liquid sample and its manufacture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 335 (M-856)(3683) 27. Juni 1989 & JP-A-11 14 617 ( RINNAI CORP ) 8. Mai 1989 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0769399A2 (en) * 1995-10-19 1997-04-23 WEBASTO THERMOSYSTEME GmbH Vehicle heating device
EP0769399A3 (en) * 1995-10-19 1998-12-23 WEBASTO THERMOSYSTEME GmbH Vehicle heating device
NL1006559C2 (en) * 1997-07-11 1999-01-12 Vries Metaal Bv Regulation of fuel supply to a heating appliance.
EP0890793A1 (en) * 1997-07-11 1999-01-13 Metaal Vries B.V. Control of fuel supply to a heating apparatus
EP1116916A1 (en) * 2000-01-11 2001-07-18 Robert Bosch Gmbh Gas heating appliance with pneumatically controlled premix-burner
US20140124587A1 (en) * 2012-11-05 2014-05-08 Pat Caruso Modulating burner system
US9528712B2 (en) * 2012-11-05 2016-12-27 Pat Caruso Modulating burner system

Also Published As

Publication number Publication date
DE4109841C2 (en) 1994-06-09
DE4109841A1 (en) 1992-10-01
DE59205137D1 (en) 1996-03-07
PT100296A (en) 1994-04-29
PT100296B (en) 1999-07-30
EP0505714B1 (en) 1996-01-24
EP0505714A3 (en) 1993-03-03

Similar Documents

Publication Publication Date Title
EP0036126B1 (en) Combustion air flow control apparatus for combustion gas users
EP0505714B1 (en) Control device for a gas burner with a fan for supplying combustion air
EP0644377A1 (en) Control device for gas burners
EP0062854B1 (en) Gas-fired water or air heater
DE3911268A1 (en) CONTROL DEVICE FOR GAS BURNERS
DE19635974A1 (en) Gas-air mixture system for gas heating apparatus
EP1063481B1 (en) Gas fired instantaneous water heater
EP0062856B1 (en) Control device for a gas-heated boiler of a warm-water heating installation
DE2752663A1 (en) Gas burner automatic air-fuel ratio regulating equipment - has thermostatic unit controlling gas valve, linked airflow control flap
DE3634449A1 (en) Instrument for controlling or regulating a mass flow of a gaseous or vaporous or liquid medium
EP0866270B1 (en) Gas-fired heating apparatus, especially a water heater
DE3006683C2 (en)
EP0643264A1 (en) Method for controlling the flame quality of a atmospheric gas burner and gas burner for carrying out this method
AT411794B (en) HEAT TRANSFER UNIT WITH JET PUMP AS ACTUATOR
EP0103303A2 (en) Fuel-heated heat source
EP0049328A1 (en) Device for the heat recovery of waste gases of some plants
DE3689309T2 (en) Control of the fluid temperature in a hot water central heating system and components suitable for a central heating system.
AT397851B (en) HEATER
DE1027863B (en) Automatic control device for gas water heater with heat exchanger
EP0733857B1 (en) Control device for a burner with a chamber for the combustion air
EP0036613A1 (en) Regulation apparatus for a gas-fired water or air heater which is controllable by a temperature sensor
DE102004063992B4 (en) Regulating and controlling process for firing apparatus involves using characteristic curve showing value range for setpoint temperature in accordance with two parameters
DE19711140A1 (en) Method for operating burner with mixture of fuel and air
EP1039247A2 (en) Heater with a premix burner
DE10024787B4 (en) heater

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): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19930818

17Q First examination report despatched

Effective date: 19950317

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

ET Fr: translation filed
REF Corresponds to:

Ref document number: 59205137

Country of ref document: DE

Date of ref document: 19960307

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960411

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
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: GB

Payment date: 20020211

Year of fee payment: 11

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

Ref country code: FR

Payment date: 20020221

Year of fee payment: 11

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

Ref country code: GB

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

Effective date: 20030215

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

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

Effective date: 20031031

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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

Ref country code: IT

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

Effective date: 20050215

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

Ref country code: DE

Payment date: 20110421

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59205137

Country of ref document: DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59205137

Country of ref document: DE

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 EXPIRATION OF PROTECTION

Effective date: 20120216