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EP0733857A2 - Control device for a burner with a chamber for the combustion air - Google Patents

Control device for a burner with a chamber for the combustion air Download PDF

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Publication number
EP0733857A2
EP0733857A2 EP96100271A EP96100271A EP0733857A2 EP 0733857 A2 EP0733857 A2 EP 0733857A2 EP 96100271 A EP96100271 A EP 96100271A EP 96100271 A EP96100271 A EP 96100271A EP 0733857 A2 EP0733857 A2 EP 0733857A2
Authority
EP
European Patent Office
Prior art keywords
control device
temperature
combustion air
fuel
venturi nozzle
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
EP96100271A
Other languages
German (de)
French (fr)
Other versions
EP0733857B1 (en
EP0733857A3 (en
Inventor
Ulrich Ing. Besser
Christian Dipl.-Ing. Welte
Ernst Dipl.-Ing. Schmidt
Arno Dipl.-Ing. Boettcher
Manfred Dipl.-Ing. Hosch
Matthias Ing. Schmidl
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 EP0733857A2 publication Critical patent/EP0733857A2/en
Publication of EP0733857A3 publication Critical patent/EP0733857A3/en
Application granted granted Critical
Publication of EP0733857B1 publication Critical patent/EP0733857B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel 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
    • F23N1/06—Regulating fuel supply conjointly with draught
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/02—Measuring filling height in burners
    • 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
    • F23N3/00—Regulating air supply or draught
    • F23N3/04—Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements
    • 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

Definitions

  • the invention relates to a control device for a burner with a fan for the combustion air according to the preamble of the main claim.
  • the setpoint device for a gas control valve not only detects the volume flow of the combustion air, but also its temperature.
  • the setpoint is controlled depending on the temperature so that the ratio of air mass to gas mass and thus the excess air can be kept almost constant at the temperatures of the combustion air that occur in practice, within a predetermined power range of the gas burner.
  • a control pressure orifice is used as the setpoint device, which has a main opening and a temperature-controlled secondary opening.
  • the control device with the characterizing features of the main claim has the Advantage that the differential pressure generating venturi nozzle used as a setpoint generator for a fuel control device has a relatively low flow resistance in the combustion air line and thus small blower outputs are sufficient to generate the air mass flow required for a required burner output for combustion with excess air. Blowers with lower power can thus be used, which then result in smaller dimensions, for example of a heater as a whole. In addition, flow noises are reduced compared to devices with orifices used as setpoints. This aspect plays a role when the burner is used in an apartment (kitchen, bathroom, etc.).
  • the bimetallic element used as a temperature-sensitive actuator is attached to a constriction of the venturi nozzle, so that it can influence the cross-section of the venturi nozzle at the constriction in accordance with the temperature of the combustion air without significantly influencing the flow resistance in the channel-shaped line itself.
  • the fuel is preferably supplied in the area of the Venturi nozzle, so that thorough mixing of the fuel and the combustion air is ensured.
  • webs are mounted on an inner wall of the outlet part of the Venturi nozzle perpendicular to this inner wall, between which the fuel-air mixture flows along. Flow noise and pressure losses after the constriction can be reduced.
  • the bimetallic element and the webs are advantageously arranged with respect to one another in such a way that the fuel-air mixture can flow along the webs in the entire temperature range of the combustion air, despite the different positions of the bimetal element.
  • FIG. 1 shows a schematic overall view of the burner device integrated in a heater
  • FIG. 2 shows a plan view of an outlet part of the longitudinally cut Venturi nozzle
  • FIG. 3 shows a side view of the outlet part of the longitudinally cut Venturi nozzle.
  • a vacuum chamber 12 which is surrounded by a housing 10 in a gas-tight manner and in which a burner 14 loaded with an air / fuel gas mixture is arranged.
  • the combustion air is conveyed from the outside to the burner 14 by a fan 20 arranged in an exhaust pipe 18 through a duct-shaped line 16.
  • the exhaust line 18 and the channel-shaped line 16 run coaxially to one another in the region of an opening 17 in the housing 10.
  • a gas line 26 leading via a gas control device 24 opens into the channel-shaped line 16, the channel-shaped line 16 continuing in the further course a mixture of fuel gas and combustion air takes place.
  • the channel-shaped line 16 leads into a distributor chamber 28 of the burner 14, from which the fuel gas-air mixture passes through a perforated plate 30 and is distributed uniformly into a combustion zone of the burner 14.
  • the combustion takes place in a combustion chamber 34, above which a heat exchanger 36 for the water to be heated is arranged. In the direction of flow behind the heat exchanger 36, the exhaust gas generated during combustion is released into the open via the exhaust line 18.
  • the channel-shaped line 16 is designed in the manner of a Venturi nozzle 38 with a tapering inlet part 40, a constriction 42 and an expanding outlet part 44.
  • the Venturi nozzle 38 represents a setpoint generator for a gas pressure regulator (not shown) in the gas control device 24.
  • a differential pressure is derived from the air volume flow of the combustion air in the channel-shaped line 16 and the Venturi nozzle 38 and is transmitted via lines 46, 48 to the gas pressure regulator of the gas control device 24 .
  • the line 46 detects the pressure in the channel-shaped line 16 upstream of the Venturi nozzle 38 and the line 48 detects the pressure at the constriction 42 of the Venturi nozzle 38.
  • the Venturi nozzle 38 and the gas pressure regulator are designed in such a way that they cover a predetermined output range of the burner 14 results in an excess air in the fuel gas-air mixture for a predetermined normal value of the combustion air temperature.
  • the Venturi nozzle 38 is 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 in a temperature-dependent manner in such a way that an essentially constant excess of air also occurs at different temperatures of the combustion air results.
  • the constriction 42 of the Venturi nozzle 38 is provided with a temperature-sensitive actuator 50 that, depending on the temperature of the combustion air, changes the cross section of the constriction 42 and thus also the differential pressure in the desired manner, in particular as the air pressure lowers the differential pressure.
  • the ratio of air mass to gas mass which is decisive for the combustion, can be kept essentially constant.
  • the temperature-sensitive actuator 50 is designed as a bimetallic element, which is attached directly to the constriction 42 of the Venturi nozzle 38 and is exposed to the temperature of the combustion air.
  • the cross section of the constriction 42 of the Venturi nozzle 38 which can be changed by the actuator 50, is thus dimensioned 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 output range of the burner 14, so that in this output range the excess air is almost constant.
  • the webs 52 are designed in such a way that the cross section of the gaps formed, which increases in the direction of flow, essentially corresponds to the cross section of the outlet part 44 of the Venturi nozzle 38.
  • the result of this is that the high flow velocities of the combustion air occurring at the constriction 42 are delayed in such a way that a high proportion of the dynamic pressure is converted back into static pressure.
  • the pressure loss of the differential pressure generation thus remains low.
  • the number of nozzles 54 coincides with the number of spaces 56. In addition to reducing the pressure losses, the mixing of the fuel gas and air mixture is promoted and flow noise is reduced.
  • the Venturi nozzle (38) has a relatively low flow resistance in the channel-shaped line (16). Smaller blower capacities are therefore sufficient to generate the air mass flow required for a required burner output for combustion with excess air.

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  • 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)
  • Control Of Combustion (AREA)
  • Air Supply (AREA)

Abstract

A reference element is provided to sense the temperature of the combustion air, in order to keep a roughly constant ratio between the air and fuel mass flows. The element forms part of a duct (16) in the shape of a Venturi nozzle (38). The cross section at a constricted part (42) of the nozzle can be controlled depending on the air temperature, and this may be achieved by an element (50) which is sensitive to temperature, and which may be bimetallic.

Description

Die Erfindung geht aus von einer Regelvorrichtung für einen Brenner mit einem Gebläse für die Verbrennungsluft nach der Gattung des Hauptanspruchs.The invention relates to a control device for a burner with a fan for the combustion air according to the preamble of the main claim.

Bei einer bekannten Regelvorrichtung dieser Gattung (DE 41 09 841 C2) erfaßt der Sollwertgeber für ein Gasregelventil nicht nur den Volumenstrom der Verbrennungsluft, sondern auch deren Temperatur. Der Sollwert wird dabei temperaturabhängig so gesteuert, daß bei den in der Praxis vorkommenden Temperaturen der Verbrennungsluft, innerhalb eines vorgegebenen Leistungsbereichs des Gasbrenners, das Verhältnis von Luftmasse zu Gasmasse und damit der Luftüberschuß nahezu konstant gehalten werden kann. Dabei wird als Sollwertgeber eine Steuerdruckblende eingesetzt, die über eine Hauptöffnung und eine temperaturgesteuerte Nebenöffnung verfügt.In a known control device of this type (DE 41 09 841 C2), the setpoint device for a gas control valve not only detects the volume flow of the combustion air, but also its temperature. The setpoint is controlled depending on the temperature so that the ratio of air mass to gas mass and thus the excess air can be kept almost constant at the temperatures of the combustion air that occur in practice, within a predetermined power range of the gas burner. A control pressure orifice is used as the setpoint device, which has a main opening and a temperature-controlled secondary opening.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Regelvorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß die als Sollwertgeber für eine Brennstoffregeleinrichtung eingesetzte differenzdruckerzeugende Venturidüse einen verhältnismäßig geringen Strömungswiderstand in der Verbrennungsluftleitung aufweist und damit kleine Gebläseleistungen ausreichen, um den bei einer geforderten Brennerleistung notwendigen Luftmassenstrom für eine Verbrennung mit Luftüberschuß zu erzeugen. Es können damit Gebläse mit kleinerer Leistung eingesetzt werden, die dann kleinere Abmessungen beispielsweise eines Heizgeräts insgesamt bewirken. Darüberhinaus werden auftretende Strömungsgeräusche gegenüber Geräten mit als Sollwertgeber eingesetzten Blenden reduziert. Dieser Gesichtspunkt spielt dann eine Rolle, wenn der Brenner in einer Wohnung (Küche, Bad etc.) zum Einsatz kommt.The control device according to the invention with the characterizing features of the main claim has the Advantage that the differential pressure generating venturi nozzle used as a setpoint generator for a fuel control device has a relatively low flow resistance in the combustion air line and thus small blower outputs are sufficient to generate the air mass flow required for a required burner output for combustion with excess air. Blowers with lower power can thus be used, which then result in smaller dimensions, for example of a heater as a whole. In addition, flow noises are reduced compared to devices with orifices used as setpoints. This aspect plays a role when the burner is used in an apartment (kitchen, bathroom, etc.).

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der Anordnung nach dem Hauptanspruch möglich.Advantageous further developments of the arrangement according to the main claim are possible through the measures listed in the subclaims.

Das als temperaturempfindliches Stellglied eingesetzte Bimetallelement ist an einer Engstelle der Venturidüse angebracht, so daß es, entsprechend der Temperatur der Verbrennungsluft, den Querschnitt der Venturidüse an der Engstelle beeinflussen kann, ohne den Strömungswiderstand in der kanalförmigen Leitung selbst wesentlich zu beeinflussen.The bimetallic element used as a temperature-sensitive actuator is attached to a constriction of the venturi nozzle, so that it can influence the cross-section of the venturi nozzle at the constriction in accordance with the temperature of the combustion air without significantly influencing the flow resistance in the channel-shaped line itself.

Die Brennstoffzufuhr erfolgt vorzugsweise im Bereich der Venturidüse, so daß eine gute Durchmischung des Brennstoffs und der Verbrennungsluft gewährleistet ist.The fuel is preferably supplied in the area of the Venturi nozzle, so that thorough mixing of the fuel and the combustion air is ensured.

Vorteilhafterweise sind an einer Innenwand des Auslaßteils der Venturidüse senkrecht zu dieser Innenwand Stege angebracht, zwischen denen das Brennstoff-Luftgemisch entlangströmt. Strömungsgeräusche und auftretende Druckverluste nach der Engstelle können damit reduziert werden. Das Bimetallelement und die Stege sind in vorteilhafter Weise so zueinander angeordnet, daß im gesamten Temperaturbereich der Verbrennungsluft trotz der unterschiedlichen Stellungen des Bimetallelements ein Strömen des Brennstoff-Luft-Gemisches entlang der Stege möglich ist.Advantageously, webs are mounted on an inner wall of the outlet part of the Venturi nozzle perpendicular to this inner wall, between which the fuel-air mixture flows along. Flow noise and pressure losses after the constriction can be reduced. The bimetallic element and the webs are advantageously arranged with respect to one another in such a way that the fuel-air mixture can flow along the webs in the entire temperature range of the combustion air, despite the different positions of the bimetal element.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Fig. 1 eine schematische Gesamtansicht der in einem Heizgerät integrierten Brennereinrichtung, Fig. 2. eine Draufsicht auf ein Auslaßteil der längs geschnittenen Venturidüse und Fig. 3 eine Seitenansicht des Auslaßteiles der längs geschnittenen Venturidüse.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a schematic overall view of the burner device integrated in a heater, FIG. 2 shows a plan view of an outlet part of the longitudinally cut Venturi nozzle, and FIG. 3 shows a side view of the outlet part of the longitudinally cut Venturi nozzle.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Das Heizgerät nach Fig. 1 weist eine von einem Gehäuse 10 gasdicht umgebene Unterdruckkammer 12 auf, in der ein mit einem Luft-Brenngas-Gemisch beaufschlagter Brenner 14 angeordnet ist. Durch eine kanalförmige Leitung 16 wird die Verbrennungsluft von außen durch ein in einer Abgasleitung 18 angeordnetes Gebläse 20 zum Brenner 14 gefördert. Dabei verlaufen die Abgasleitung 18 und die kanalförmige Leitung 16 im Bereich einer Öffnung 17 des Gehäuses 10 koaxial zueinander.1 has a vacuum chamber 12, which is surrounded by a housing 10 in a gas-tight manner and in which a burner 14 loaded with an air / fuel gas mixture is arranged. The combustion air is conveyed from the outside to the burner 14 by a fan 20 arranged in an exhaust pipe 18 through a duct-shaped line 16. The exhaust line 18 and the channel-shaped line 16 run coaxially to one another in the region of an opening 17 in the housing 10.

An einer Stelle 22 mündet eine über eine Gasregeleinrichtung 24 führende Gasleitung 26 in die kanalförmige Leitung 16 ein, wobei im weiteren Verlauf der kanalförmigen Leitung 16 eine Vermischung von Brenngas und Verbrennungsluft stattfindet. Die kanalförmige Leitung 16 führt in eine Verteilerkammer 28 des Brenners 14, aus welcher das Brenngas-Luft-Gemisch durch ein Lochblech 30 gleichmäßig verteilt in eine Brennzone des Brenners 14 gelangt. Die Verbrennung erfolgt in einer Brennkammer 34, über der ein Wärmeübertrager 36 für das zu erhitzende Wasser angeordnet ist. In Strömungsrichtung hinter dem Wärmeübertrager 36 gelangt das bei der Verbrennung entstehende Abgas über die Abgasleitung 18 ins Freie.At a point 22, a gas line 26 leading via a gas control device 24 opens into the channel-shaped line 16, the channel-shaped line 16 continuing in the further course a mixture of fuel gas and combustion air takes place. The channel-shaped line 16 leads into a distributor chamber 28 of the burner 14, from which the fuel gas-air mixture passes through a perforated plate 30 and is distributed uniformly into a combustion zone of the burner 14. The combustion takes place in a combustion chamber 34, above which a heat exchanger 36 for the water to be heated is arranged. In the direction of flow behind the heat exchanger 36, the exhaust gas generated during combustion is released into the open via the exhaust line 18.

Im Bereich der Gaszufuhr 22 ist die kanalförmige Leitung 16 nach Art einer Venturidüse 38 mit einem sich verjüngenden Einlaßteil 40, einer Engstelle 42 und einem sich erweiternden Außlaßteil 44 ausgebildet. Die Venturidüse 38 stellt einen Sollwertgeber für einen nicht dargestellten Gasdruckregler in der Gasregeleinrichtung 24 dar. Aus dem Luftvolumenstrom der Verbrennungsluft in der kanalförmigen Leitung 16 und der Venturidüse 38 wird ein Differenzdruck abgeleitet, der über Leitungen 46, 48 an den Gasdruckregler der Gasregeleinrichtung 24 übertragen wird. Die Leitung 46 erfaßt den Druck in der kanalförmigen Leitung 16 stromauf der Venturidüse 38 und die Leitung 48 erfaßt den Druck an der Engstelle 42 der Venturidüse 38. Die Venturidüse 38 und der Gasdruckregler sind wie bekannt so ausgebildet, daß sich über einen vorgegebenen Leistungsbereich des Brenners 14 für einen vorgegebenen Normalwert der Verbrennungslufttemperatur ein Luftüberschuß im Brenngas-Luftgemisch ergibt.In the area of the gas supply 22, the channel-shaped line 16 is designed in the manner of a Venturi nozzle 38 with a tapering inlet part 40, a constriction 42 and an expanding outlet part 44. The Venturi nozzle 38 represents a setpoint generator for a gas pressure regulator (not shown) in the gas control device 24. A differential pressure is derived from the air volume flow of the combustion air in the channel-shaped line 16 and the Venturi nozzle 38 and is transmitted via lines 46, 48 to the gas pressure regulator of the gas control device 24 . The line 46 detects the pressure in the channel-shaped line 16 upstream of the Venturi nozzle 38 and the line 48 detects the pressure at the constriction 42 of the Venturi nozzle 38. As is known, the Venturi nozzle 38 and the gas pressure regulator are designed in such a way that they cover a predetermined output range of the burner 14 results in an excess air in the fuel gas-air mixture for a predetermined normal value of the combustion air temperature.

Die Venturidüse 38 ist erfindungsgemäß so ausgebildet, daß sie auch die Temperatur der Verbrennungsluft erfaßt und den Sollwert des Gasdruckreglers temperaturabhängig so steuert, daß sich ein im wesentlichen konstanter Luftüberschuß auch bei unterschiedlichen Temperaturen der Verbrennungsluft ergibt. Zu diesem Zweck ist die Engstelle 42 der Venturidüse 38 mit einem temperaturempfindlichen Stellglied 50 versehen, daß in Abhängigkeit der Temperatur der Verbrennungsluft den Querschnitt der Engstelle 42 und somit auch den Differenzdruck in der gewünschten Weise verändert, insbesondere mit steigender Lufttemperatur den Differenzdruck absenkt. So kann das für die Verbrennung entscheidende Verhältnis von Luftmasse zu Gasmasse im wesentlichen konstant gehalten werden. Das temperaturempfindliche Stellglied 50 ist als Bimetallelement ausgebildet, das unmittelbar an der Engstelle 42 der Venturidüse 38 befestigt und der Temperatur der Verbrennungsluft ausgesetzt ist.The Venturi nozzle 38 is 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 in a temperature-dependent manner in such a way that an essentially constant excess of air also occurs at different temperatures of the combustion air results. For this purpose, the constriction 42 of the Venturi nozzle 38 is provided with a temperature-sensitive actuator 50 that, depending on the temperature of the combustion air, changes the cross section of the constriction 42 and thus also the differential pressure in the desired manner, in particular as the air pressure lowers the differential pressure. The ratio of air mass to gas mass, which is decisive for the combustion, can be kept essentially constant. The temperature-sensitive actuator 50 is designed as a bimetallic element, which is attached directly to the constriction 42 of the Venturi nozzle 38 and is exposed to the temperature of the combustion air.

Der durch das Stellglied 50 veränderbare Querschnitt der Engstelle 42 der Venturidüse 38 ist also so dimensioniert, daß bei allen in der Praxis vorkommenden Temperaturen der Verbrennungsluft innerhalb eines vorgegebenen Leistungsbereichs des Brenners 14 das Verhältnis von Luftmasse zu Gasmasse annähernd gleich ist, so daß in diesem Leistungsbereich auch der Luftüberschuß annähernd konstant ist.The cross section of the constriction 42 of the Venturi nozzle 38, which can be changed by the actuator 50, is thus dimensioned 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 output range of the burner 14, so that in this output range the excess air is almost constant.

Aufgrund der Drosselung des geförderten Luftvolumenstroms an der Engstelle 42 der Venturidüse 38 kommt es zu einer Druckabsenkung. Um diese Druckverluste so gering wie möglich zu halten, ist das Auslaßteil 44 der Venturidüse 38, wie bekannt, erweitert. Die Druckverluste können weiter reduziert werden, wenn, wie in Fig. 2 und Fig. 3 dargestellt, an der Innenwand 43 des Auslaßteils 44 der Venturidüse 38 Stege 52 angebracht sind, zwischen denen das Brenngas und die Verbrennungsluft nach dem Passieren der Engstelle 42 entlangströmen. Das an der Engstelle 42 über die Düsen 54 austretende Brenngas beginnt sich vor und zwischen den Stegen 52 mit der Verbrennungsluft zu vermischen. Dabei sind die Stege 52 so ausgebildet, daß der in Strömungsrichtung zunehmende Querschnitt der gebildeten Zwischenräume mit dem Querschnitt des Auslaßteils 44 der Venturidüse 38 im wesentlichen übereinstimmt. Damit wird erreicht, daß die an der Engstelle 42 auftretenden hohen Strömungsgeschwindigkeiten der Verbrennungsluft in der Weise verzögert werden, so daß ein hoher Anteil des dynamischen Drucks wieder in statischen Druck gewandelt wird. Der Druckverlust der Differenzdruckerzeugung bleibt somit gering. Die Anzahl der Düsen 54 stimmt mit der Anzahl der Zwischenräume 56 überein. Neben der Reduzierung der Druckverluste wird gleichzeitig die Durchmischung des Brenngas-Luftgemisches gefördert und auftretende Strömungsgeräusche reduziert. Die Venturidüse (38) weist einen verhältnismäßig geringen Strömungswiderstand in der kanalförmigen Leitung (16) auf. Deshalb reichen kleinere Gebläseleistungen aus, um den bei einer geforderten Brennerleistung notwendigen Luftmassenstrom für eine Verbrennung mit Luftüberschuß zu erzeugen.Due to the throttling of the conveyed air volume flow at the constriction 42 of the Venturi nozzle 38, the pressure is reduced. In order to keep these pressure losses as low as possible, the outlet part 44 of the Venturi nozzle 38 is widened, as is known. The pressure losses can be further reduced if, as shown in FIGS. 2 and 3, webs 52 are attached to the inner wall 43 of the outlet part 44 of the Venturi nozzle 38, between which the fuel gas and the combustion air flow after passing through the constriction 42. The fuel gas emerging at the constriction 42 via the nozzles 54 begins before and to mix with the combustion air between the webs 52. The webs 52 are designed in such a way that the cross section of the gaps formed, which increases in the direction of flow, essentially corresponds to the cross section of the outlet part 44 of the Venturi nozzle 38. The result of this is that the high flow velocities of the combustion air occurring at the constriction 42 are delayed in such a way that a high proportion of the dynamic pressure is converted back into static pressure. The pressure loss of the differential pressure generation thus remains low. The number of nozzles 54 coincides with the number of spaces 56. In addition to reducing the pressure losses, the mixing of the fuel gas and air mixture is promoted and flow noise is reduced. The Venturi nozzle (38) has a relatively low flow resistance in the channel-shaped line (16). Smaller blower capacities are therefore sufficient to generate the air mass flow required for a required burner output for combustion with excess air.

Claims (9)

Regelvorrichtung für einen Brenner mit einem Gebläse für die Verbrennungsluft und mit einem aus dem Luftstrom eine Steuergröße ableitenden Sollwertgeber für eine Brennstoffregeleinrichtung, die innerhalb eines vorgegebenen Leistungsbereichs des Brenners das Mischungsverhältnis von Brennstoff und Verbrennungsluft im Sinne einer Optimierung der Verbrennung steuert, wobei der Sollwertgeber der Brennstoffregeleinrichtung auch die Temperatur der Verbrennungsluft erfaßt und den Sollwert temperaturabhängig so steuert, daß auch bei einer Änderung der Verbrennungslufttemperatur das eingestellte Verhältnis Brennstoffmasse/Masse der Verbrennungsluft im wesentlichen konstant bleibt, dadurch gekennzeichnet, daß der Sollwertgeber als Teil einer kanalförmigen Leitung (16) und nach Art einer Venturidüse (38) ausgebildet ist, deren Querschnitt an einer Engstelle (42) temperaturabhängig steuerbar ist.Control device for a burner with a blower for the combustion air and with a setpoint generator for a fuel control device which derives a control variable from the airflow and which controls the mixture ratio of fuel and combustion air within the scope of a predefined output range of the burner in order to optimize combustion, the setpoint generator of the fuel control device also detects the temperature of the combustion air and controls the setpoint as a function of temperature so that even when the combustion air temperature changes, the set ratio of fuel mass / mass of the combustion air remains essentially constant, characterized in that the setpoint generator is part of a channel-shaped line (16) and according to Art a Venturi nozzle (38) is formed, the cross section of which can be controlled at a narrow point (42) as a function of temperature. Regelvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Engstelle (42) der Venturidüse (38) von einem temperaturempfindlichen Stellglied (50) veränderbar ist.Control device according to claim 1, characterized in that the constriction (42) of the Venturi nozzle (38) can be changed by a temperature-sensitive actuator (50). Regelvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das temperaturempfindliche Stellglied (50) ein Bimetallelement ist.Control device according to claim 1 or 2, characterized in that the temperature-sensitive actuator (50) is a bimetal element. Regelvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Gebläse (10) stromab der kanalförmigen Leitung (16) und der Venturidüse (38) in einer Abgasleitung (18) angeordnet ist.Control device according to one of the preceding claims, characterized in that the fan (10) is arranged downstream of the channel-shaped line (16) and the Venturi nozzle (38) in an exhaust gas line (18). Regelvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Brennstoffzuleitung (26) an die kanalförmige Leitung (16) im Bereich der Venturidüse (38) angeschlossen ist.Control device according to one of the preceding claims, characterized in that the fuel feed line (26) is connected to the channel-shaped line (16) in the region of the Venturi nozzle (38). Regelvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß stromab der Gaszufuhr (22) an einem Auslaßteil (44) der Venturidüse (38) Stege (52) angebracht sind, zwischen denen das Brennstoff-Luft-Gemisch entlangströmt.Control device according to one of the preceding claims, characterized in that, downstream of the gas supply (22), webs (52) are attached to an outlet part (44) of the Venturi nozzle (38), between which the fuel-air mixture flows. Regelvorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Stege (52) an einer Innenwand (43) des Auslaßteils (44) angeordnet sind.Control device according to claim 6, characterized in that the webs (52) are arranged on an inner wall (43) of the outlet part (44). Regelvorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die Stege (52) und die Innenwand (43) des Auslaßteils (44) senkrecht zueinander stehen.Control device according to one of claims 6 or 7, characterized in that the webs (52) and the inner wall (43) of the outlet part (44) are perpendicular to one another. Regelvorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Anzahl der durch die Stege (52) gebildeten Zwischenräume (56) mit der Anzahl der für die Brennstoffzufuhr in der kanalförmigen Leitung (16) eingesetzten Düsen (54) übereinstimmt.Control device according to one of claims 6 to 8, characterized in that the number of spaces (56) formed by the webs (52) corresponds to the number of nozzles (54) used for supplying fuel in the channel-shaped line (16).
EP96100271A 1995-03-24 1996-01-10 Control device for a burner with a chamber for the combustion air Expired - Lifetime EP0733857B1 (en)

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DE29504705U DE29504705U1 (en) 1995-03-24 1995-03-24 Control device for a burner with a fan for the combustion air
DE29504705U 1995-03-24

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EP0733857A3 EP0733857A3 (en) 1996-12-04
EP0733857B1 EP0733857B1 (en) 1998-11-25

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP0790465B1 (en) * 1996-02-14 2001-10-31 Robert Bosch Gmbh Monitoring device of a heater

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Publication number Priority date Publication date Assignee Title
NL1006559C2 (en) * 1997-07-11 1999-01-12 Vries Metaal Bv Regulation of fuel supply to a heating appliance.

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DE4109841C2 (en) 1991-03-26 1994-06-09 Bosch Gmbh Robert Control device for gas burners with a fan for supplying combustion air

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DE2607286C3 (en) * 1976-02-23 1979-03-22 Tuezelestechnikai Kutatointezet, Miskolc (Ungarn) Air volume control for fireplaces
DE9319364U1 (en) * 1993-12-16 1994-02-24 Buderus Heiztechnik Gmbh, 35576 Wetzlar Atmospheric gas burner

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Publication number Priority date Publication date Assignee Title
DE4109841C2 (en) 1991-03-26 1994-06-09 Bosch Gmbh Robert Control device for gas burners with a fan for supplying combustion air

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790465B1 (en) * 1996-02-14 2001-10-31 Robert Bosch Gmbh Monitoring device of a heater

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DE59600853D1 (en) 1999-01-07
EP0733857B1 (en) 1998-11-25
EP0733857A3 (en) 1996-12-04
DE29504705U1 (en) 1996-07-25

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