EP0255472B1 - Gas burner - Google Patents

Gas burner Download PDF

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Publication number
EP0255472B1
EP0255472B1 EP87730086A EP87730086A EP0255472B1 EP 0255472 B1 EP0255472 B1 EP 0255472B1 EP 87730086 A EP87730086 A EP 87730086A EP 87730086 A EP87730086 A EP 87730086A EP 0255472 B1 EP0255472 B1 EP 0255472B1
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EP
European Patent Office
Prior art keywords
mixture
gas
gas burner
burner according
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87730086A
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German (de)
French (fr)
Other versions
EP0255472A3 (en
EP0255472A2 (en
Inventor
Kurt Pelzer
Horst Reichmann
Wolfgang Henche
Winfried Uckelmann
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.)
Vaillant BV
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
SCHONEWELLE BV
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Priority claimed from AT202386A external-priority patent/AT393018B/en
Priority claimed from DE19868631542 external-priority patent/DE8631542U1/de
Priority claimed from AT53287A external-priority patent/AT388793B/en
Priority claimed from AT188987A external-priority patent/AT391189B/en
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, SCHONEWELLE BV filed Critical Vaillant Austria GmbH
Publication of EP0255472A2 publication Critical patent/EP0255472A2/en
Publication of EP0255472A3 publication Critical patent/EP0255472A3/en
Application granted granted Critical
Publication of EP0255472B1 publication Critical patent/EP0255472B1/en
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Classifications

    • 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
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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
    • F23D14/30—Inverted burners, e.g. for illumination
    • 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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit

Definitions

  • the invention relates to a gas burner, in particular a lintel burner, with a burner plate through which outlet openings for a gas-air mixture pass and through which a mixture guide and a mixture chamber can be fed with such a mixture.
  • the object of the invention is to design such a gas burner from a few, robust and simple components in such a way that it can be easily assembled and disassembled for maintenance purposes and that its components are associated with one another in such a space-saving manner that the gas burner is located a device, e.g. B. in the housing of a water heater, inexpensive to accommodate and ensures largely pollutant-free combustion with high efficiency due to the meaningful assignment of the components.
  • a device e.g. B. in the housing of a water heater
  • Such a holder is advantageously simple in design and opens up the possibility of a particularly uniform distribution of the mixture over the surface of the burner plate through which the mixture outlet openings pass.
  • This arrangement ensures a simple manner an optimally intimate mixing of combustion air with the gas, and thus the production of a gas-air mixture which x enables a low-carbon NO combustion.
  • the air duct between a stationary part containing the mouth of the gas supply line and a part movable together with the mixture guide and the burner plate connected to it has a detachable butt joint, then this part that can be moved can be easily removed from the stationary part to service or replace individual components.
  • the burner plate can be fastened in its holder with a pretension generated in the direction of the combustion chamber.
  • the blower 16 must have the steepest possible characteristic curve in the range of the required delivery volume, i.e. the delivery volume should remain essentially the same in the widest possible counter pressure range.
  • these should be able to be connected to a conventional chimney as well as to a flue gas duct made of stainless steel without any adjustment to the hygiene values of the basic setting.
  • the height of these recesses 5 should not exceed a certain limit value and the distance of the recesses 5 from the burner plate 1 should not be less than a certain limit value. In general, you can set up the measurement rule, according to which the distance should be at least twice the height.
  • This housing cover 40 on which the holder 7 also rests with its edge via a seal 41, contains insulating material and is - according to FIG. 14 - penetrated by the insulating jacket 43 of an ignition electrode 42, the connection of which protrudes upwards from the housing cover 40 and the lower end thereof is located below the burner plate 1.
  • the clamping ring 50 is formed between its radially outwardly projecting projections 52 with upright webs 58 which, if necessary, can be bent to engage the fixed ring 49 in one of the recesses 51 in order to fix the clamping ring 50.

Abstract

In the case of a gas burner, having a burner plate (1) penetrated by outlet openings (2) for a gas-air mixture and able to be charged with such a mixture via a mixture duct (3), this burner plate (1) is held detachably by means of the centrally arranged mixture duct (3) in an annular mounting (7), enclosing a mixture chamber (6). The mixture duct (3), which opens out into the mixture chamber (6) with clearances (5), is radially adjoined by an air duct (15), into which there opens coaxially and oppositely to the airstream a gas supply line (17) with a gas nozzle (18), for the purpose of mixing the air with gas. The air duct (15) may include a detachable butt joint (20) to allow a movable part containing the mixture duct (3) and the burner plate (1) to be separated as and when required from a fixed part containing the gas supply line (17) and the gas nozzle (18) and connected to a blower (16).

Description

Die Erfindung betrifft einer Gasbrenner, insbesondere einen Sturzbrenner, mit einer von Austrittsöffnungen für ein Gas-Luft-­Gemisch durchsetzten und über die eine Gemischführung und eine Gemischkammer mit einem solchen Gemisch beschickbaren Brenner­platte.The invention relates to a gas burner, in particular a lintel burner, with a burner plate through which outlet openings for a gas-air mixture pass and through which a mixture guide and a mixture chamber can be fed with such a mixture.

Aufgabe der Erfindung ist es, einen solchen Gasbrenner aus weni­gen, robusten und einfachen Bestandteilen derart zu gestalten, daß der problemlos montiert und zu Wartungszwecken fallweise de­montiert werden kann und daß seine Bestandteile in ihrem sinn­vollen Zusammenwirken einander derart raumsparend zugeordnet sind, daß sich der Gasbrenner in einem Gerät, z. B. im Gehäuse eines Wasserheizers, günstig unterbringen läßt und infolge der sinnvollen Zuordnung der Bestandteile eine weitgehend schadstoff­freie Verbrennung mit hohem Wirkungsgrad gewährleistet.The object of the invention is to design such a gas burner from a few, robust and simple components in such a way that it can be easily assembled and disassembled for maintenance purposes and that its components are associated with one another in such a space-saving manner that the gas burner is located a device, e.g. B. in the housing of a water heater, inexpensive to accommodate and ensures largely pollutant-free combustion with high efficiency due to the meaningful assignment of the components.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Bren­nerplatte eines Gasbrenners der eingangs bezeichneten Gattung in einer die Gemischkammer einschließenden ringförmigen Halterung lösbar gehalten ist und daß die Gemischführung zentral in der Ge­mischkammer angeordnet ist und radiale Ausnehmungen zur Oberleitung des Gemisches in die Gemischkammer aufweist.According to the invention this object is achieved in that the burner plate of a gas burner of the type described in the introduction is detachably held in an annular holder enclosing the mixture chamber and in that the mixture guide is arranged centrally in the mixture chamber and has radial recesses for the overhead line of the mixture into the mixture chamber.

Eine solche Halterung ist vorteilhaft einfach gestaltbar und erschließt die Möglichkeit einer besonders gleichmäßigen Verteilung des Gemisches über die von den Gemischaustritts­öffnungen durchsetzte Fläche der Brennerplatte.Such a holder is advantageously simple in design and opens up the possibility of a particularly uniform distribution of the mixture over the surface of the burner plate through which the mixture outlet openings pass.

Nach einer bevorzugten Ausführungsform des Erfindungsgegen­standes ist der Gemischführung eine Luftführung radial angeschlossen, in die gegensinnig zum Luft-Förderstrom und koaxial eine Gaszufuhrleitung mit einer Gasdüse mündet.According to a preferred embodiment of the subject of the invention, the mixture guide is radially connected to an air guide, into which a gas supply line with a gas nozzle opens in the opposite direction to the air flow and coaxially.

Diese Anordnung gewährleistet auf einfache Weise eine optimal innige Vermischung der Verbrennungsluft mit dem Gas und damit die Herstellung eines Gas-Luft-Gemisches, das eine NOx-arme Verbrennung ermöglicht.This arrangement ensures a simple manner an optimally intimate mixing of combustion air with the gas, and thus the production of a gas-air mixture which x enables a low-carbon NO combustion.

Mit besonderen Vorteilen sind diese Erfindungsmerkmale für die Versorgung sogenannter Flächenbrenner anwendbar, weil sich das erfindungsgemäße Mischsystem mit einem solchen Brenner gut zu einer kompakten Einheit vereinigen läßt.These features of the invention can be used with particular advantages for the supply of so-called surface burners because the mixing system according to the invention can be easily combined with such a burner to form a compact unit.

Darüber hinaus erschließt diese Anordnung die Möglichkeit einer einfachen Wartung des Gasbrenners.In addition, this arrangement opens up the possibility of simple maintenance of the gas burner.

Wenn nämlich - nach einem weiteren Erfindungsmerkmal - die Luftführung zwischen einem die Mündung der Gaszufuhr­leitung enthaltenden ortsfesten Teil und einem mit der Gemischführung und der mit ihr verbundenen Brennerplatte gemeinsam ortsbeweglichen Teil eine lösbare Stoßverbindung aufweist, dann kann dieser ortsbewegliche Teil sehr einfach vom ortsfesten Teil abgezogen werden, um einzelne Bestand­teile zu warten oder auszutauschen.If, according to a further feature of the invention, the air duct between a stationary part containing the mouth of the gas supply line and a part movable together with the mixture guide and the burner plate connected to it has a detachable butt joint, then this part that can be moved can be easily removed from the stationary part to service or replace individual components.

Aufgabe der Erfindung ist ferner eine konstruktiv einfache Gestaltung der Halterung der Brennerplatte, die einer durch temperaturbedingte Spannungen verursachten Verformung vorbeugt, ohne die periphere Abdichtung des Randes der Brennerplatte zu beeinträchtigen.The object of the invention is also a structurally simple design of the holder of the burner plate, the deformation caused by temperature-related stresses prevents without affecting the peripheral sealing of the edge of the burner plate.

In diesem Sinne kann der Rand der Brennerplatte in der Halterung von einem äußeren und/oder inneren Haltering gehalten sein.In this sense, the edge of the burner plate can be held in the holder by an outer and / or inner retaining ring.

Gemäß einem weiteren Erfindungsmerkmal kann innerhalb der ringförmigen Halterung ein verdrehbarer Spannring gelagert sein, der an der Innenseite des Randes der Brennerplatte anliegt und dessen radial nach außen weisende Fortsätze in Ausnehmungen eines in der Halterung befestigten ortsfesten Ringes eingreifen und Teile dieses Ringes hintergreifen.According to a further feature of the invention, a rotatable clamping ring can be mounted within the ring-shaped holder, which rests on the inside of the edge of the burner plate and whose radially outward extensions engage in recesses in a fixed ring fastened in the holder and engage behind parts of this ring.

Ferner kann die Brennerplatte erfindungsgemäß mit einer in Richtung zum Brennraum erzeugten Vorspannung in ihrer Halterung befestigt sein.Furthermore, according to the invention, the burner plate can be fastened in its holder with a pretension generated in the direction of the combustion chamber.

Dank dieser Vorspannung entsteht in der peripheren Halterung der Brennerplatte ein vergleichsweise hoher Anpreßdruck und es kann mit einer metallischen Dichtung des Platten­randes das Auslangen gefunden werden. Einer Verwerfung der Brennerplatte zu einer für die Dichtheit ungünstigen Form wird durch eine solche Spannungsvorgabe in Richtung zur Brennerkammer zuverlässig vorgebeugt; die Brenner­platte erhält durch diese Vorspannung zwangsläufig die Form einer Kalotte.Thanks to this preload, a comparatively high contact pressure is created in the peripheral holder of the burner plate and it is possible to find it out with a metallic seal on the plate edge. A warping of the burner plate to a form that is unfavorable for the tightness is reliably prevented by such a voltage specification in the direction of the burner chamber; This pretension inevitably gives the burner plate the shape of a calotte.

Weiters ist Aufgabe der Erfindung eine Verringerung der Schadstoffemissionen eines solchen Gasbrenners sowie eine volle Verwertung der von einem solchen Gasbrenner erzeugten Wärmeenergie.Another object of the invention is to reduce the pollutant emissions of such a gas burner and to fully utilize the thermal energy generated by such a gas burner.

In diesem Zusammenhang beruht die Erfindung auf der Erkenntnis, daß der NOx-Anfall wesentlich durch eine Kühlung des Gas-Luft-Gemisches und durch eine Kühlung der Brennerplatte verringert werden kann.In this context, the invention is based on the knowledge that the NO x accumulation can be reduced significantly by cooling the gas-air mixture and by cooling the burner plate.

Erfindungsgemäß ist deshalb vorgesehen, daß die Halterung der Brennerplatte zumindest einen ein Kühlmittel führenden Hohlraum bildet.According to the invention it is therefore provided that the holder of the burner plate forms at least one cavity carrying a coolant.

Diese Lösung bringt den Vorteil, daß das Kühlmittel, vor­zugsweise Wasser, nicht nur das in der Gemischkammer befindliche Gas-Luft-Gemisch, sondern gleichzeitig auch die Brennerplatte selbst zu kühlen vermag und diesem Umstand ist es zuzuschreiben, daß die Brennerplatte vergleichs­weise geringere Abmessungen als bisher aufweisen kann. Ausführungsbeispiele der Erfindung sind in den Zeichnungen veranschaulicht.This solution has the advantage that the coolant, preferably water, is able to cool not only the gas-air mixture in the mixture chamber, but also the burner plate itself, and this fact is due to the fact that the burner plate is comparatively smaller than before can have. Embodiments of the invention are illustrated in the drawings.

Im einzelnen zeigen

  • Fig. 1 einen Axialschnitt durch einen erfindungsgemäßen Gasbrenner,
  • Fig. 2 ein Detail dieses Gasbrenners schaubildlich,
  • Fig. 3 eine Ausführungsvariante des Gasbrenners gleichfalls im Axialschnitt,
  • Fig. 4 eine Untersicht der Brennerplatte nach den Fig. 1 und 3,
  • Fig. 5 die Gasdüse einer weiteren Ausführungsvariante in einem Horizontalschnitt,
  • Fig. 6 einen Vertikalschnitt durch die Gasdüse nach Fig. 5,
  • Fig. 7 und 8 Horizontalschnitte durch Ausführungs­varianten einer solchen Gasdüse,
  • Fig. 9 die Luftführung und den Anschluß der zur Brennerplatte führenden Gemischführung im Vertikalschnitt,
  • Fig. 10 einen Horizontalschnitt durch die Luftführung und Gemischführung mit einer Teil-Draufsicht auf die Halterung der Brennerplatte,
  • Fig. 11 einen Vertikalschnitt durch die Gemischführung in größerem Maßstab,
  • Fig. 12 und 13 Horizontalschnitte durch einen Bestand­teil der Gemischführung,
  • Fig. 14 einen Vertikalschnitt durch den Rand der Halterung der Brennerplatte,
  • Fig. 15 einen Vertikalschnitt durch eine Ausführungs­variante der Halterung mit einem Spannring,
  • Fig. 16 bis 19 die Abwicklungen ringförmiger Bestand­teile dieser Ausführungsvariante nach Fig. 15,
  • Fig. 20 eine Draufsicht, teils einen Horizontal­schnitt dieser Variante,
  • Fig. 21 einen Vertikalschnitt durch eine Ausführungs­variante mit Vorspannung der Brennerplatte,
  • Fig. 22 einen Vertikalschnitt durch eine Ausführungs­variante einer wassergekühlten Halterung und
  • Fig. 23 einen peripheren Bereich der Gemischkammer.
Show in detail
  • 1 shows an axial section through a gas burner according to the invention,
  • 2 shows a detail of this gas burner,
  • 3 shows a variant of the gas burner also in axial section,
  • 4 is a bottom view of the burner plate according to FIGS. 1 and 3,
  • 5 shows the gas nozzle of a further embodiment variant in a horizontal section,
  • 6 shows a vertical section through the gas nozzle according to FIG. 5,
  • 7 and 8 horizontal sections through variants of such a gas nozzle,
  • 9 the air duct and the connection of the mixture duct leading to the burner plate in vertical section,
  • 10 is a horizontal section through the air duct and mixture duct with a partial top view of the holder of the burner plate,
  • 11 is a vertical section through the mixture guide on a larger scale,
  • 12 and 13 horizontal sections through a component of the mixture guide,
  • 14 is a vertical section through the edge of the holder of the burner plate,
  • 15 shows a vertical section through an embodiment variant of the holder with a clamping ring,
  • 16 to 19 the developments of annular components of this embodiment variant according to FIG. 15,
  • 20 is a plan view, partly a horizontal section of this variant,
  • 21 shows a vertical section through an embodiment variant with pretensioning of the burner plate,
  • 22 shows a vertical section through an embodiment variant of a water-cooled holder and
  • 23 shows a peripheral region of the mixture chamber.

Sämtliche Zeichnungsfiguren betreffen sogenannte Sturz­brenner, deren Brennerplatten 1 einem unterhalb gelegenen Brennraum 24 zugewendet sind. Dieser Brennraum 24 kann bei­speilsweise die Oberseite eines Kondensat-Wärmetauschers begrenzen.All drawing figures relate to so-called lintel burners, the burner plates 1 of which face a combustion chamber 24 located below. This combustion chamber 24 can, for example, limit the top of a condensate heat exchanger.

Gemäß der Fig. 1 und 3 ist die Luftführung 15 eines solchen Gasbrenners über eine Kupplung an ein austauschbares Gebläse 16 einer jeweils optimal wählbaren Leistung ange­schlossen, das zur Herstellung eines Gas-Luft-Gemisches einer Mischeinrichtung Luft zuführt. Entsprechend den zur Gemischbildung erforderlichen Widerständen in der Misch­einrichtung und im Gemischweg muß die Auslegung des Gebläses 16 für eine Grundeinstellung mit der optimalen Luftzahl gewählt werden.1 and 3, the air duct 15 of such a gas burner is connected via a coupling to an interchangeable fan 16 of an optimally selectable output, which feeds air to a mixing device for producing a gas-air mixture. In accordance with the resistances required for mixture formation in the mixing device and in the mixture path, the design of the fan 16 must be selected for a basic setting with the optimal air ratio.

Weil ferner das Mischungsverhältnis für möglichst alle Betriebsbedingungen gleich bleiben soll, muß das Gebläse 16 im Bereich des erforderlichen Fördervolumens eine möglichst steile Kennlinie aufweisen, d.h. es soll in einem möglichst weiten Gegendruckbereich das Fördervolumen im wesentlichen gleich bleiben. Bei Brennwertgeräten sollen diese ohne Nachstellung sowohl an einen üblichen Kamin als auch an eine aus Edelstahl bestehende Abgasführung ohne wesentliche Änderung der Hygienewerte der Grundeinstellung betriebs­sicher angeschlossen werden können.Furthermore, because the mixing ratio should remain the same for as many operating conditions as possible, the blower 16 must have the steepest possible characteristic curve in the range of the required delivery volume, i.e. the delivery volume should remain essentially the same in the widest possible counter pressure range. In the case of condensing boilers, these should be able to be connected to a conventional chimney as well as to a flue gas duct made of stainless steel without any adjustment to the hygiene values of the basic setting.

Die Gasbrenner nach den Fig. 1 und 3 weisen eine von abwärts gerichteten Gemischaustrittsöffnungen 2 (Fig. 4) durchsetzte und über die Gemischführung 3 mit einem Gas-Luft-Gemisch beschickbare Brennerplatte 1 auf, die an einer unteren Stirnwand 64 der zylindrischen Gemischführung 3 mittels einer zentrischen Verschraubung 4 und einer Haltescheibe 64ʹ befestigt ist. Diese Gemischführung 3 weist in einem Abstand von der Stirnwand 64 radiale Ausnehmungen 5 auf, über die das aus der Gemischführung 3 zuströmende Gemisch in die von der Halterung 7 der Brennerplatte 1 umschlossene Gemischkammer 6 austreten kann.The gas burners according to FIGS. 1 and 3 have a mixture outlet openings 2 (FIG. 4) which are directed downwards and through which a gas-air mixture passes through the mixture guide 3 Loadable burner plate 1, which is fastened to a lower end wall 64 of the cylindrical mixture guide 3 by means of a central screw connection 4 and a holding disk 64ʹ. This mixture guide 3 has radial recesses 5 at a distance from the end wall 64, via which the mixture flowing from the mixture guide 3 can exit into the mixture chamber 6 enclosed by the holder 7 of the burner plate 1.

Die Höhe dieser Ausnehmungen 5 sollte einen bestimmten Grenzwert nicht überschreiten und der Abstand der Ausnehmungen 5 von der Brennerplatte 1 sollte einen gewissen Grenzwert nicht unterschreiten. Allgemein kann man die Gemessungsregel aufstellen, wonach der Abstand mindestens dem Doppelten der Höhe entsprechen sollte.The height of these recesses 5 should not exceed a certain limit value and the distance of the recesses 5 from the burner plate 1 should not be less than a certain limit value. In general, you can set up the measurement rule, according to which the distance should be at least twice the height.

Die kreisrunde Brennerplatte 1 wird an ihrem Rand von der ringförmigen Halterung 7 gehalten, und zwar bei diesem dargestellten Ausführungsbeispiel vom horizontalen Schenkel eines winkelförmig profilierten äußeren Halteringes 8 gemäß Fig. 2, der mittels Befestigungsorganen 9 an der zylindrischen Wandung der Halterung 7 befestigt ist und den Rand der Brennerplatte 1 dichtend gegen den einwärts gerichteten Randflansch 37 der Halterung 7 drückt.The circular burner plate 1 is held at its edge by the annular holder 7, in this embodiment shown by the horizontal leg of an angularly profiled outer retaining ring 8 according to FIG. 2, which is fastened to the cylindrical wall of the holder 7 by means of fastening elements 9 and Edge of the burner plate 1 sealingly presses against the inward edge flange 37 of the holder 7.

Die Gemischkammer 6 wird oben von einer Abschlußplatte 10 begrenzt, die von der Gemischführung 3 durchsetzt ist.The mixture chamber 6 is delimited at the top by an end plate 10, through which the mixture guide 3 passes.

Den radialen Ausnehmungen 5 des Mündungsbereiches der Gemisch­führung 3 ist eine Ringblende 11 zugeordnet, die zur Einstellung eines optimalen Gemischdurchsatzes mittels einer Spindel 12 axial verstellbar ist, um die Größe des Öffnungsquerschnittes zu bestimmen. Die Einstellung der Ringblende 11 und der Spindel 12 erfolgt mittels einer Gewindemutter 13 und einer Gegenmutter 14 am oberen, mit einem Gewinde versehenen Ende der Spindel 12 unter Abstützung gegen die obere Stirnwand 64 der Gemischführung 3.The radial recesses 5 of the mouth area of the mixture guide 3 is assigned an annular diaphragm 11 which can be adjusted axially by means of a spindle 12 to adjust the optimum mixture throughput to the size of the To determine the opening cross-section. The ring diaphragm 11 and the spindle 12 are adjusted by means of a threaded nut 13 and a lock nut 14 on the upper, threaded end of the spindle 12 with support against the upper end wall 64 of the mixture guide 3.

Dem oberen Bereich dieser Gemischführung 3 ist eine Luft­führung 15 radial angeschlossen, in der die mittels des Gebläses 16 geförderte Verbrennungsluft zuströmt und mit Gas vermischt wird.An air duct 15 is connected radially to the upper region of this mixture duct 3, in which the combustion air conveyed by the blower 16 flows in and is mixed with gas.

In diese Luftführung 15 mündet nämlich koaxial und gegensinnig zum Luftstrom eine Gaszufuhrleitung 17 in einer austausch­bar befestigten und koaxial von einer Düsenbohrung durchsetzten Gasdüse 18, die von einem Halterung 19 koaxial in der Luft­führung gehalten wird. Dieser Haltering 19 bildet im Bereich der Gasdüse 18 eine als Stauscheibe wirkende Drossel, die den vorderen Teil der Luftführung 15 gegen den hinteren, als Mischkammer dienenden Teil abgrenzt.A gas supply line 17 opens into this air duct 15 coaxially and in the opposite direction to the air flow in a gas nozzle 18 which is exchangeably fastened and coaxially penetrated by a nozzle bore and which is held coaxially in the air duct by a holder 19. This retaining ring 19 forms in the region of the gas nozzle 18 a throttle acting as a baffle plate, which delimits the front part of the air duct 15 from the rear part, which serves as a mixing chamber.

Das zuströmende Gas vermischt sich innig mit der im Gegen­strom geförderten Verbrennungsluft und dieses Gemisch gelangt dann über die Gemischführung 3 in die Gemischkammer 6 und zu den Gemischaustrittsöffnungen 2 der Brennerplatte 1. Durch die Umlenkung des Gemisches im Bereich der recht­winkeligen Einmündung der Luftführung 15 in die Gemischführung 3 wird dessen gründliche Durchmischung zusätzlich begünstigt.The inflowing gas mixes intimately with the combustion air conveyed in countercurrent and this mixture then passes via the mixture guide 3 into the mixture chamber 6 and to the mixture outlet openings 2 of the burner plate 1. By deflecting the mixture in the area of the right-angled opening of the air guide 15 into the mixture guide 3, its thorough mixing is additionally promoted.

Der zwischen dem Haltering 19 der Gasdüse 18 und der Gemisch­führung 3 verlaufende Teil der Luftführung 15 weist gemäß Fig. 1 eine von schräg zur Achse verlaufenden Flanschen gebildete Stoßverbindung 20 auf, so daß der rechte Teil der Luftführung 15 gemeinsam mit der daran anschließenden Gemischführung 3 für Wartungsarbeiten nach Lösen der Ver­schraubung 4 problemlos von der Brennerplatte 1 und vom ortsfesten, die Gasdüse 18 enthaltenden Teil der Luft­führung 15 abgenommen werden kann.The part of the air duct 15 running between the retaining ring 19 of the gas nozzle 18 and the mixture guide 3 has, according to FIG. 1, a butt joint 20 formed by flanges extending obliquely to the axis, so that the right part the air duct 15 together with the adjoining mixture duct 3 for maintenance work after loosening the screw connection 4 can be easily removed from the burner plate 1 and from the stationary part of the air duct 15 containing the gas nozzle 18.

Der Gasbrenner umfaßt ferner die von einer Vielzahl von Ausnehmungen 2 durchsetzte Brennerplatte 1, die den Brenn­raum 24 von der Gemischkammer 6 trennt und zentral an der Gemischführung befestigt und abgestützt ist. In sämtlichen Gemischaustrittsöffnungen 2 dieses Flächen­brenners sollte tunlichst die gleichen Strömungsgeschwin­digkeit auftreten, um bei geringen Luftzahlen ein Rück­schlagen oder partielles Glühen der Brennerplatte 1 oder bei hohen Luftzahlen ein teilweises Abheben der Flammen zu verhindern.The gas burner further comprises the burner plate 1, which is penetrated by a plurality of recesses 2 and separates the combustion chamber 24 from the mixture chamber 6 and is fastened and supported centrally on the mixture guide. In all mixture outlet openings 2 of this surface burner, the same flow rate should occur as possible, in order to prevent the burner plate 1 from kicking back or partially glowing in the case of low air numbers or to partially raise the flames at high air numbers.

Wie Fig.4 zeigt, ist diese Brennerplatte 1 von einer Vielzahl zueinander parallel verlaufender Scharen von Gemisch­austrittsöffnungen 2 durchsetzt, die in voneinander distanzierte Gruppen gegliedert sind. Beispielsweise gesitzen die Lochscharen innerhalb dieser Gruppen jeweils einheitliche Abstände und jede fünfte Lochschar entfällt, so daß die verbleibenden Vierergruppen dadurch einen dem Doppelten des einheitlichen Abstandes entsprechenden Abstand voneinander aufweisen.As FIG. 4 shows, this burner plate 1 is penetrated by a plurality of sets of mixture outlet openings 2 which run parallel to one another and are divided into groups which are spaced apart from one another. For example, the groups of holes sit within these groups in each case uniform distances and every fifth group of holes is omitted, so that the remaining groups of four thereby have a distance from one another which is twice the uniform distance.

Das Lochbild der Brennerplatte 1 ist ebenso wie der Loch­durchmesser von Bedeutung für das Emissionsverhalten des Gasbrenners, für dessen Neigung zum Rückschlagen bzw. Abheben der Flammen sowie für die Bandbreite der Luftzahl.The hole pattern of the burner plate 1, like the hole diameter, is important for the emission behavior of the gas burner, for its tendency to kick back or lift off the flames, and for the range of the air ratio.

Fig. 3 zeigt eine Ausführungsvariante des Gasbrenners, derzufolge die Gaszufuhrleitung 17 durch eine Stirnwand 21 der Luftführung 15 koaxial zur Gasdüse 18 geführt ist und mit einer Gewindemuffe 22 in dieser Stirnwand 21 axial einstellbar gehalten wird.Fig. 3 shows an embodiment of the gas burner, according to which the gas supply line 17 is guided coaxially to the gas nozzle 18 through an end wall 21 of the air duct 15 and is held axially adjustable in this end wall 21 with a threaded sleeve 22.

Außerdem ist bei dieser Ausführungsvariante die zylindrische, mit der Gemischführung 3 koaxiale Halterung 7 der Brenner­platte 1 durch eine Isolierung 23 von einer den Brennraum 24 einschließenden und innerhalb eines Geräte-Gehäuses 25 befindlichen zylindrischen Wandung 26 getrennt.In addition, in this embodiment variant, the cylindrical holder 7 of the burner plate 1, which is coaxial with the mixture guide 3, is separated by insulation 23 from a cylindrical wall 26 which encloses the combustion chamber 24 and is located within a device housing 25.

Den radialen Ausnehmungen 5 des Mündungsbereiches der Gemischführung 3 ist innerhalb der Gemischkammer 6 ein konisch gestalteter, sich abwärts verjüngender, axial einstellbarer Verteilerteller 27 mit schräg aufwärts verlaufender Leit­fläche zugeordnet, um das aus den Ausnehmungen 5 austretende Gemisch den Gemischaustrittsöffnungen 2 der Brennerplatte 1 möglichst gleichmäßig verteilt zuzuführen.The radial recesses 5 of the mouth area of the mixture guide 3 are assigned within the mixture chamber 6 a conically shaped, downwardly tapering, axially adjustable distributor plate 27 with an obliquely upwardly extending guide surface in order to distribute the mixture emerging from the recesses 5 to the mixture outlet openings 2 of the burner plate 1 as evenly as possible feed.

Die Abschlußplatte 10 der Gemischkammer 6 bildet einen Teil der Gehäusedecke, die mit den Dichtungen 41 auf dem Rand des Geräte-Gehäuses 25 aufruht.The end plate 10 of the mixture chamber 6 forms part of the housing cover, which rests with the seals 41 on the edge of the device housing 25.

Gemäß der in den Fig. 5 bis 14 dargestellten Ausführungsform eines Gasbrenners wird die Gasdüse 18 innerhalb der Luft­führung 15 von einem seitlich in diese Luftführung 15 einragenden Ende der Gaszufuhrleitung 17 in einer dort untergebrachten Dichtung 28 gehalten und kann in diese Dichtung 28 einfach, nämlich verschraubungslos, eingesteckt werden.According to the embodiment of a gas burner shown in FIGS. 5 to 14, the gas nozzle 18 is held within the air duct 15 by an end of the gas supply line 17 protruding laterally into this air duct 15 in a seal 28 accommodated therein and can be simply, namely screwless, into this seal 28 , be plugged in.

An ihrem dem Gebläse 16 zugewendeten Ende ist die Gasdüse 18 mittels eines Zapfens 29 in einer zentralen Ausnehmung 30 der Halterung 19 zentriert und an dem der Gemischführung 3 zugewendeten Ende wird sie durch ein Gewindestück ver­schlossen und von dem Federbügel 31 gehalten, dessen Enden gemäß Fig. 6 in einander gegenüberliegenden Ausnehmungen 32 eine Rohrstutzens 33 verankerbar sind, der die Gasdüse 18 mit Abstand umgibt.At its end facing the blower 16, the gas nozzle 18 is centered in a central recess 30 of the holder 19 by means of a pin 29 and at the end facing the mixture guide 3 it is closed by a threaded piece and held by the spring clip 31, the ends of which are shown in FIG. 6 a pipe socket 33, which surrounds the gas nozzle 18 at a distance, can be anchored in mutually opposite recesses 32.

Das Gas tritt aus radialen Düsenbohrungen 34 aus, die innerhalb des Rohrstutzens 33 angeordnet sind und für eine intensive Vermischung des Gases mit der dort rasant durch­strömenden Luft sorgen.The gas emerges from radial nozzle bores 34, which are arranged within the pipe socket 33 and ensure intensive mixing of the gas with the air flowing rapidly therethrough.

Fig. 7 und 8 zeigen Varianten der Ausbildung der Gasdüse 18. So kann gemäß Fig. 7 und 8 der zentrierende Zapfen 29 als Gewindezapfen ausgebildet und verschraubt sein, und zwar kann er sich mit einem Schraubenkopf im Inneren der hohlen Gasdüse 18 (Fig. 7) oder an deren freier Stirn­seite (Fig. 8) abstützen, wobei er im letztgenannten Fall auch der Fixierung des Federbügels 31 dienen kann, der in der Schraubnut des Schraubenkopfes Platz findet.7 and 8 show variants of the design of the gas nozzle 18. According to FIGS. 7 and 8, the centering pin 29 can be designed and screwed as a threaded pin, specifically it can be screwed inside the hollow gas nozzle 18 (FIG. 7 ) or on the free end face (Fig. 8), which in the latter case can also serve to fix the spring clip 31, which can be accommodated in the screw groove of the screw head.

Fig. 9 veranschaulicht deutlicher die Abnehmbarkeit des rechts der Stoßverbindung 20 der Luftführung 15 befindlichen Teiles, der auch die Gemischführung 3 und den an ihr befestigten Brennerkopf umfaßt, von dem links der Stoß­verbindung 20 befindlichen ortsfesten, die Gasdüse 18 ent­haltenden und an das Gebläse 16 angeschlossenen Teil. Ferner ist aus Fig. 9 die Einstellung der axial beweglichen Ringblende 11 ersichtlich, die die Ausnehmungen 5 des Mündungsbereiches der Gemischführung 3 bedarfsweise mehr oder weniger weitgehend abdeckt (Fig. 12, 13). Der Einstellung dieser Ringblende 11 dient die bereits erwähnte Spindel 12, an deren unterem Ende ein dreiarmiger Träger 35 der Ring­blende 11 lösbar befestigt ist, und deren oberes, mit einem Gewinde versehenes Ende einstellbar in einer Gewindemutter 13 verschraubt und mittels einer Gegenmutter 14 in einer Sollstellung fixierbar ist.Fig. 9 illustrates more clearly the removability of the part located on the right of the butt joint 20 of the air duct 15, which also includes the mixture duct 3 and the burner head attached to it, from the fixed part on the left of the butt joint 20 containing the gas nozzle 18 and connected to the blower 16 Part. Furthermore, FIG. 9 shows the setting of the axially movable ring diaphragm 11, which covers the recesses 5 of the mouth area of the mixture guide 3 to a greater or lesser extent if necessary (FIGS. 12, 13). The setting of this ring diaphragm 11 is served by the already mentioned spindle 12, at the lower end of which a three-armed carrier 35 of the ring diaphragm 11 is detachably fastened, and the upper, threaded end of which is adjustably screwed into a threaded nut 13 and by means of a lock nut 14 in a desired position is fixable.

Schließlich zeigt Fig. 9 auch die Befestigung der Brennerplatte 1 in ihrer Halterung 7 mittels eines Halteringes 36, der an dem unteren Ende der Gemischführung 3 befestigt ist und den Rand der Brennerplatte 1 gegen den einwärts gerichteten Randflansch 37 der ringförmigen Halterung 7 drückt.Finally, FIG. 9 also shows the fastening of the burner plate 1 in its holder 7 by means of a retaining ring 36 which is fastened to the lower end of the mixture guide 3 and presses the edge of the burner plate 1 against the inwardly directed edge flange 37 of the annular holder 7.

Mit der Außenseite der Gemischführung 3 ist auch die obere, eine Isolierung tragende Abschlußplatte 10 der Gemischkammer 6 fest verbunden, deren Rand über eine Dichtung 38 am Rand der ringförmigen Halterung 7 dichtend anliegt und gemäß Fig.10 von Pratzen 39 gehalten ist, die am Rand der Gehäuse­decke 40 befestigt sind.With the outside of the mixture guide 3, the upper, insulation-carrying end plate 10 of the mixture chamber 6 is firmly connected, the edge of which rests sealingly on the edge of the annular holder 7 via a seal 38 and is held by claws 39 according to FIG the housing cover 40 are attached.

Diese Gehäusedecke 40, an der auch die Halterung 7 mit ihrem Rand über eine Dichtung 41 aufliegt, enthält Isoliermaterial und wird - gemäß Fig. 14 - vom isolierenden Mantel 43 einer Zündelektrode 42 durchsetzt, deren Anschluß aufwärts aus der Gehäusedecke 40 ausragt und deren unteres Ende sich unterhalb der Brennerplatte 1 befindet.This housing cover 40, on which the holder 7 also rests with its edge via a seal 41, contains insulating material and is - according to FIG. 14 - penetrated by the insulating jacket 43 of an ignition electrode 42, the connection of which protrudes upwards from the housing cover 40 and the lower end thereof is located below the burner plate 1.

Diese Zündelektrode ist von unten her einschiebbar und wird von einer Feder 44 gehalten, die in einer Vertiefung 45 des Mantels 43 einrastet und an einem Ansatz 46 der Gehäusedecke 40 mittels einer Schraube befestigt ist.This ignition electrode can be inserted from below and is held by a spring 44 which engages in a recess 45 in the casing 43 and is fastened to a shoulder 46 of the housing cover 40 by means of a screw.

Die Fig. 15 bis 20 stellen eine andere Ausführungsform der Halterung 7 der Brennerplatte 1 dar, und zwar umfaßt die Halterung 7 einen Gemisch-Leitring 47, der in der Halterung 7 einen peripheren Ringraum 48 abgrenzt. An ihrer Peripherie nimmt die Halterung 7 einen ortsfesten Ring 49 auf, der mit der Innenseite der ringförmigen Halterung 7 verschweißt ist und von deren einwärtsgerich­tetem Randflansch 37 untergriffen wird.15 to 20 show another embodiment of the holder 7 of the burner plate 1, namely the holder 7 comprises a mixture guide ring 47 which delimits a peripheral annular space 48 in the holder 7. At its periphery, the holder 7 receives a stationary ring 49, which is welded to the inside of the annular holder 7 and is gripped by its inward-facing edge flange 37.

An diesem ortsfesten Ring 49 ist der drehbare Spannring 50 verankerbar, und zwar besitzt dieser ortsfeste Ring 49 gemäß Fig.19 nach oben offene, jedoch hinterschnittene Ausnehmungen 51, in die nach außen weisende radiale Fortsätze 52 des Spannringes 50 eingreifen.The rotatable clamping ring 50 can be anchored to this stationary ring 49, specifically this stationary ring 49 according to FIG. 19 has upwardly open but undercut recesses 51, into which outward radial extensions 52 of the clamping ring 50 engage.

Unterhalb dieser radialen Fortsätze 52 ist der Spannring 50 federnd elastisch, nämlich etwa V-förmig, profiliert und dückt mit seiner Unterkante 53 gegen den Rand der Brennerplatte 1.Below these radial extensions 52, the clamping ring 50 is resiliently elastic, namely approximately V-shaped, profiled and presses with its lower edge 53 against the edge of the burner plate 1.

Weil diese Brennerplatte 1 mit der Ebene ihrer Unterseite (Außenseite) gegenüber einem Randflansch 37 der Halterung 7 abgesetzt ist und vorragt, ist die Hitzeeinwirkung der Brennerflammen auf die Halterung 7 vergleichsweise gering.Because this burner plate 1 is offset and protrudes with the plane of its underside (outside) relative to an edge flange 37 of the holder 7, the heat effect of the burner flames on the holder 7 is comparatively low.

Die Spannkraft des Spannringes 50 kann auf beliebig wählbare konstruktive Weise auf den Rand der Brennerplatte 1 über­tragen werden.The clamping force of the clamping ring 50 can be transmitted to the edge of the burner plate 1 in any desired constructive manner.

So können etwa gemäß Fig. 16 gewölbt profilierte, in Ab­ständen voneinander angeordnete Zungen 54 vorgesehen werden oder aus einem durchlaufenden Rand ausgebeulte Noppen 55 gemäß Fig. 17. Man kann den unteren Rand des Spannringes 50 aber auch glatt (eben) ausbilden, wenn man den Fortsätzen 52 eine in der mit dem Pfeil 56 bezeichneten Spannrichtung ansteigende schräge Anlauffläche 57 gibt.For example, according to FIG. 16, curved tongues 54 spaced apart from one another can be provided, or knobs 55 bulged out from a continuous edge, as shown in FIG. 17. However, the lower edge of the clamping ring 50 can also be designed to be smooth (flat) if the Extensions 52 are an inclined contact surface 57 rising in the clamping direction indicated by arrow 56.

Aus Fig. 18 ist noch ersichtlich, daß der Spannring 50 zwischen seinen radial nach außen ragenden Fortsätzen 52 mit aufrechten Stegen 58 ausgebildet ist, die bedarfsweise zur Fixierung des Spannringes 50 in eine der Ausnehmungen 51 es ortsfesten Ringes 49 eingreifend abkantbar sind.From Fig. 18 it can still be seen that the clamping ring 50 is formed between its radially outwardly projecting projections 52 with upright webs 58 which, if necessary, can be bent to engage the fixed ring 49 in one of the recesses 51 in order to fix the clamping ring 50.

Fig. 15 zeigt ferner noch eine peripher angeordnete Arretierung 59 der Halterung 7 in bezug zur ortsfesten Gehäusedecke 40.15 also shows a peripherally arranged locking device 59 of the holder 7 in relation to the stationary housing cover 40.

Drei periphere, im gleichen Winkelabstand voneinander ein­wärts abgebogene Nocken 60 des ortsfesten Ringes 49 sichern im Eingriff mit drei zugeordneten Ausschnitten 61 der Peripherie der Brennerplatte 1 diese Platte beim Spannen mittels des drehbaren Spannringes 50 gegen eine Verdrehung; sie sind aus Fig. 20 ersichtlich.Three peripheral cams 60 of the fixed ring 49 which are bent inwards at the same angular distance from one another, in engagement with three assigned cutouts 61 of the periphery of the burner plate 1, secure this plate against rotation during clamping by means of the rotatable clamping ring 50; they can be seen in FIG. 20.

Fig. 21 zeigt einen Querschnitt durch einen Gasbrenner, dessen Brennerplatte 1 mit Vorspannung in ihrer Halterung 7 eingespannt ist.21 shows a cross section through a gas burner, the burner plate 1 of which is clamped in its holder 7 with pretension.

In ihrem Zentrum ist diese Brennerplatte 1 gegen die Stirn­wand 64 der Gemischführung 3 abgestützt und ein Zapfen 65 dient der einwandfreien Zentrierung der Brennerplatte 1 an dieser Stirnwand 64. Die Vorspannung der Brennerplatte 1 ist mittels der Schraubbolzen 61a und eines verschraubbaren Ringes 63 einstellbar.At its center, this burner plate 1 is supported against the end wall 64 of the mixture guide 3 and a pin 65 is used for the perfect centering of the burner plate 1 on this end wall 64. The pretensioning of the burner plate 1 can be adjusted by means of the screw bolts 61a and a screwable ring 63.

Die linke bzw. rechte Hälfte der Zeichnung zeigen zwei verschiedene Varianten der Ausbildung der peripheren Halterung 7 der Brennerplatte 1 am Brennergehäuse 25.The left and right half of the drawing show two different variants of the design of the peripheral holder 7 of the burner plate 1 on the burner housing 25.

Bei beiderlei Varianten ist der Rand der Brennerplatte 1 zwischen einem stützenden Flansch 37 und einem überdeckenden Flansch 62 der Halterung 7 dichtend eingespannt.In both variants, the edge of the burner plate 1 is clamped in a sealing manner between a supporting flange 37 and an overlapping flange 62 of the holder 7.

Gemäß dem linken Teil der Darstellung ist der überdeckende Flansch 62 der Halterung 7 von einem mit dem Brennergehäuse 25 mittels Schraubbolzen 61a verschraubbaren Ring 63 gebildet.According to the left part of the illustration, the overlapping flange 62 of the holder 7 is formed by a ring 63 which can be screwed to the burner housing 25 by means of screw bolts 61a.

Hingegen ist bei der im rechten Teil der Zeichnung darge­stellten Variante der überdeckende Flansch 62 der Halterung 7 an dem am Gehäuse 25 befestigten stützenden Flansch 37 der Halterung 7 befestigt.On the other hand, in the variant shown in the right part of the drawing, the overlapping flange 62 of the holder 7 is fastened to the supporting flange 37 of the holder 7 fastened to the housing 25.

Bei beiden Variaten könnte der stützende Flansch 37 ais Schenkel eines am Gehäuse 25 befestigten Z- oder U-Profiles gestaltet sein.In both variants, the supporting flange 37 could be designed as a leg of a Z or U profile fastened to the housing 25.

Fig. 22 zeigt schließlich eine Halterung 7, die von einem Hohlprofil 67 verkörpert wird und einen wasserführenden Hohlraum 68 einschließt sowie einen einwärts gerichteten Ringflansch 37 trägt, auf dem die Brennerplatte 1 aufliegt. Die isolierende obere Abschlußplatte 10 der Gemischkammer 6 ruht in einem ringförmigen, mit einer Dichtung 38 bestückten Auflager 66 des Hohlprofiles 67 und ist gemeinsam mit der Brennerplatte 1 und der Gemischführung 3 aus der Halterung abziehbar.22 finally shows a holder 7, which is embodied by a hollow profile 67 and includes a water-carrying cavity 68 and carries an inwardly directed ring flange 37 on which the burner plate 1 rests. The insulating upper end plate 10 of the mixture chamber 6 rests in an annular seal 38 equipped support 66 of the hollow profile 67 and can be removed together with the burner plate 1 and the mixture guide 3 from the holder.

Das die Halterung 7 bildende Hohlprofil 67 kann auch ein Teil des Gehäuses 25 sein und sein Hohlraum 68 ist zwecks Verwertung der vom Kühlmittel, vorzugsweise Wasser, aufge­nommenen Wärme an das Umlaufsystem eines Wasserheizers, z. B. an den Vor- und Rücklauf einer Heizungsanlage, an­schließbar.The holder 7 forming the hollow profile 67 can also be part of the housing 25 and its cavity 68 is for the purpose of recycling the heat absorbed by the coolant, preferably water, to the circulation system of a water heater, e.g. B. can be connected to the supply and return of a heating system.

Wie schon erwähnt kann der zylindrische, unten durch einen Boden begrenzte Brennraum 24 eines erfindungsgemäßen Gas­brenners innerhalb des Gehäuses eines Wasserheizers ange­ordnet sein. Der Boden des Brennraumes 24 kann durch die gegebenenfalls rinnenförmig profilierte Oberseite eines Kondensatwärmetauschers gebildet werden.As already mentioned, the cylindrical combustion chamber 24 of a gas burner according to the invention, which is delimited at the bottom by a base, can be arranged within the housing of a water heater. The bottom of the combustion chamber 24 can be formed by the top of a condensate heat exchanger, which may have a channel-shaped profile.

Die Außenseite (Oberseite) der von der Gemischführung 3 durchsetzten, die Gemischkammer 6 oben abschließenden Platte 10 sowie der die Halterung 7 der Brennerplatte 1 umschließende Bereich der Gehäusedecke 40 sind zweckmäßiger­weise mit einem Isoliermaterial gefüllt, wie dies die Fig. 6, 9, 14, 15, und 21 zeigen.The outside (top) of the plate 10, which is traversed by the mixture guide 3 and which closes the mixture chamber 6 at the top, and the area of the housing cover 40 which surrounds the holder 7 of the burner plate 1 are expediently filled with an insulating material, as is shown in FIGS. 6, 9, 14, 15 and 21 show.

In Fig. 23 ist noch einmal ein peripherer Bereich der Gemischkammer 6, insbesondere als Detail des Auführungs­beispieles gemäß Fig. 22, dargestellt. Es ist ersichtlich, daß eine Zündelektrode, sich parallel zur Längsachse der Gemischführung erstreckend, die Gemischkammer 6 durchquert. Die Zündelektrode ist innerhalb der Gemischkammer 6 mit einem isolierenden Schutzrohr 69 versehen, welches sich einerseits an der Brennerplatte 1 und andererseits an der Abschlußplatte 10 abstützt. Die Anordnung der Zünd­elektrode innerhalb der Gemischkammer 6 ist derart getroffen daß eine der Pratzen 39 zur Befestigung der Abschlußplatte 10 an der Gehäusedecke radial benachbart ist. Dadurch ist eine stabilisierende Halterung der Zündelektrode über Verbindungselemente zur Pratze 39 möglich.FIG. 23 again shows a peripheral area of the mixture chamber 6, in particular as a detail of the exemplary embodiment according to FIG. 22. It can be seen that an ignition electrode, extending parallel to the longitudinal axis of the mixture guide, crosses the mixture chamber 6. The ignition electrode is provided within the mixture chamber 6 with an insulating protective tube 69, which is supported on the one hand on the burner plate 1 and on the other hand on the end plate 10. The arrangement of the ignition electrode within the mixture chamber 6 is such that one of the claws 39 for fastening the end plate 10 is radially adjacent to the housing ceiling. A stabilizing mounting of the ignition electrode via connecting elements to the claw 39 is thereby possible.

Claims (50)

1. A gas burner, particularly a downdraft burner, comprising a burner plate, through which outlet openings for a gas-air mixture extend and which is adapted to be supplied with such mixture through a mixture duct and a mixture chamber, char­acterized in that the burner plate (1) is detachably held in an annular holder (7), which encloses the mixture chamber (6), and the mixture duct is centrally disposed in the mixture chamber and has radial aper­tures (5) for conducting the mixture into the mixture chamber.
2. A gas burner according to claim 1, char­acterized in that an air duct (15) is radially connected to the mixture duct (3) and a gas supply line (17) provided with a gas nozzle (18) opens into the air duct (15) coaxially and in a sense which is opposite to the entraining air stream.
3. A gas burner according to claim 1 or 2, characterized in that the burner plate (1) is connected by a central screw joint (4) to an end wall (64) of the mixture duct (3) (Figures 1, 2).
4. A gas burner according to claim 1 or 2, characterized by a central pin (65) for centring the burner plate (1) on an end wall (64) of the mixture duct (3) (Figure 21).
5. A gas burner according to any of claims 1 to 4, characterized in that the annular holder (7) comprises an inwardly directed edge flange (37) for supporting the rim of the burner plate (1) (Figures 1 to 3, 9, 14, 15, 21, 22).
6. A gas burner according to claim 5, charac­terized in that the burner plate (1) is held between the edge flange (37) of the holder (1) and the horizontal leg of an angle-section outer retaining ring (8), which is secured to the cylindrical wall of the holder (7) (Figures 1 to 3, 21).
7. A gas burner according to claim 5, char­acterized in that the burner plate (1) is held between the edge flange (37) of the holder (1) and a retaining ring (36), which is secured to the mixture duct (3) (Figures 9, 14).
8. A gas burner according to claim 5, char­acterized in that a rotatable clamping ring (50) is movably mounted in the cylindrical holder (1) in the mixture chamber (6) and bears on the inside surface of the rim of the burner plate (1) and has radially outwardly directed extensions (52), which extend into recesses (51) of a stationary ring (49), which is fixed in the mixture chamber (6), and said extensions extend behind and engage portions of that ring (49) (Figures 15 to 20).
9. A gas burner according to claim 8, charac­terized in that the clamping ring (50) has a resilient, e.g., V-shaped profile below its extensions (52) and with that rim which faces the burner plate (1) bears on the rim of the burner plate (Figure 15).
10. A gas burner according to claim 9, characterized in that the clamping ring (50) has a flat bottom edge (53) which bears on the burner plate (1) (Figure 18).
11. A gas burner according to claim 9, characterized in that the rim of the clamping ring (50) is provided with individual tongues (54), which prefer­ably have a curved profile and which bear on the rim of the burner plate (1) (Figure 16).
12. A gas burner according to claim 9, characterized in that bosses (55) or the like have been bulged out of the rim of the clamping ring (50) and the clamping ring (50) bears with said bosses on the rim of the burner plate (1) (Figure 17).
13. A gas burner according to claim 9, characterized in that the extensions (52) of the clamping ring (50) have ramp surfaces which obliquely rise in the tightening direction (56) and engage from below those portions of the stationary ring (49) which are engaged from below by said extensions (52) (Fig­ure 18).
14. A gas burner according to any of claims 8 to 13, characterized in that the clamping ring (50) is provided between its radially outwardly directed extensions (52) with upright webs (58), which are adapted to be bent to extend into one of the recesses (51) of the stationary ring (49) when this is required to fix the clamping ring (50) (Figure 18).
15. A gas burner according to any of claims 1 to 14, characterized in that the burner plate (1) is secured in its holder (7) under an initial stress which is produced in the direction towards the combustion chamber (24) (Figure 21).
16. A gas burner according to claim 15, characterized in that the amount of the initial stress is adjustable by screw bolts (61), by which the holder (7) is connected to a portion of the housing (25) (Figure 21).
17. A gas burner according to claim 15 or 16, characterized in that the rim of the burner plate (1) is sealingly clamped between a supporting flange (37) of the holder (7) and an adjustable overlying flange (62) (Figure 21).
18. A gas burner according to claim 17, characterized in that the overlying flange (62) is constituted by a ring (63), which is adapted to be screw-connected to the burner housing (25) by screw bolts (61) (Figure 21, left).
19. A gas burner according to claim 17, characterized in that the overlying flange (62) of the holder (7) is secured to the supporting flange (37) (Figure 21, right).
20. A gas burner according to any of claims 1 to 19, characterized in that the holder (7) for the burner plate (1) constitutes at least one cavity (68) for conducting a coolant (Figure 22).
21. A gas burner according to claim 20, characterized in that the annular holder (7) consists of a tubular bar (67), which constitutes a support (37) for the burner plate (1) (Figure 22).
22. A gas burner according to claim 20 or 21, characterized in that the tubular bar (67) constitutes on that side which is opposite to the burner plate (1) a support (69), which is preferably provided with a seal (38) and supports the plate (10), rich defines the mixing chamber (6) and through which the central mixture duct (3) extends (Figure 22).
23. A gas burner according to claim 22, characterized in that the burner plate (1), the mixture guide (3) and the plate (10) which defines the mixture chamber (6) are adapted to be jointly withdrawn from the associated holder (7) (Figure 22).
24. A gas burner according to any of claims 20 to 23, characterized in that the cavity (68) of the holder (7) communicates with the circulating system of a water heater, which is heated by the gas burner.
25. A gas burner according to any of claims 1 to 24, characterized in that the top wall (40) of the housing (25) which encloses the gas burner has a portion which is adjacent to the holder (7) for the burner plate (1) and a sheathed igniting electrode (42) extends obliquely through said portion and has a terminal which protrudes upwardly from the housing top wall (40) and a bottom end disposed below the burner plate (1) (Figure 14).
26. A gas burner according to claim 25, characterized in that the igniting electrode (42) is adapted to be inserted from below and is held by a spring (44), which snaps into a recess (45) of the sheath (43) and is secured to an extension (46) of the housing top wall (40).
27. A gas burner according to any of claims 1 to 24, characterized in that the mixture chamber (6) is defined by an upper closing plate (10), through which the mixture duct (3) extends (Figures 1, 3, 9, 15, 21, 22).
28. A gas burner according to claim 27, characterized in that the rate of flow through said apertures (5) disposed near the mouth of the mixture duct is adjustable (Figures 1, 9, 15, 21, 22).
29. A gas burner according to claim 28, characterized by an annular orifice plate (11), which is axially displaceable by a screw (12) and is associated with the radial apertures (5) of the mixture duct (3) and serves to adjust the flow rate of the mixture (Figures 1, 9, 11 to 13).
30. A gas burner according to any of claims 27 to 29, characterized in that the apertures (5) are spaced from the burner plate (1) by a distance which is at least twice the height of the apertures (5) (Figure 1).
31. A gas burner according to claim 29 or 30, characterized in that a nut (137) for adjusting the annular orifice plate (11) is provided at the top end of the screw (12) and bears on the top end wall (65) of the mixture duct (3) and is adapted to be fixed by an associated lock nut (14) (Figures 1, 9, 11).
32. A gas burner according to claim 27, characterized in that a downwardly tapering conical distributing plate (27) is provided in the mixture chamber (6) and serves to direct obliquely outwardly the mixture which leaves the apertures (5) of the mixture duct (3) (Figure 3).
33. A gas burner according to any of claims 2 to 32, characterized in that the air duct (15) comprises a separable butt joint (20) between a stationary part, which contains the mouth of the gas supply line (17) and the gas nozzle (18), and a movable part, which is movable in unison with the mixture duct (3) and the burner plate (1) that is connected to the mixture duct (3) (Figures 1, 5, 6, 9, 10).
34. A gas burner according to claim 33, characterized in that the butt joint consists of flanges, which are provided on the two parts to be joined and extend obliquely to the axis of the air duct (15) (Figures 1, 5, 6, 9, 10).
35. A gas burner according to any of claims 2 to 34, characterized in that the gas supply line (17) opens within the air duct (15) in a frustoconical gas nozzle (18) having an axial through bore (Figure 3).
36. A gas burner according to any of claims 2 to 34, characterized in that the gas supply line (17) opens within the air duct (15) in a gas nozzle (18), which has radial bores (34) (Figures 6 to 9).
37. A gas burner according to claim 36, characterized in that the gas supply line (17) has an end which laterally protrudes into the air duct (15) and holds the gas nozzle (18) within the air duct (15) so that the gas nozzle (18) is adapted to be inserted into a seal (28) which is accommodated there.
38. A gas burner according to claim 36 or 37, characterized in that that end of the gas nozzle (18) which faces the fan (16) is centred in a central aperture of an annular holder (19) in the air duct (15) (Figures 5 to 10).
39. A gas burner according to claim 37 or 38, characterized in that that end of the gas nozzle which faces the mixture duct (3) is closed, preferably by a screw-threaded member, and is held by a U-shaped spring (31) (Figures 5 to 10).
40. A gas burner according to any of claims 36 to 39, characterized in that the gas nozzle (18) is concentrically surrounded in its annular holder (19) by a spaced apart concentric tubular member (33) (Figures 5 to 10).
41. A gas burner according to claims 39 and 40, characterized in that the ends of the U-shaped spring are anchored in openings (32) of the tubular member (33) (Figure 6).
42. A gas burner according to any of claims 2 to 41, characterized in that the air duct (15) contains adjacent to the gas nozzle (18) an orifice plate, throttle or the like, which has the shape of a circular ring and optionally serves as a holder (19) for the gas nozzle and is adjoined by a portion of the air duct (15), which portion serves to mix the gas and the air (Fig­ures 1, 3, 5 to 10).
43. A gas burner according to any of claims 2 to 42, characterized in that the gas supply line (17) which is coaxial to the gas nozzle (18) and to the air duct (15) is adjustably held in an end wall (21), by which the air duct (15) is closed (Figure 3).
44. A gas burner according to any of claims 2 to 43, characterized in that the mixture outlet open­ings (2) in the burner plate (1) are arranged in spaced apart groups (Figure 4).
45. A gas burner according to any of claims 1 to 44, characterized in that the combustion chamber (24) is cylindrical and is defined at its lower end by a bottom and is disposed within the housing (25) of a water heater.
46. A gas burner according to any of claims 1 to 45, characterized in that the bottom of the combustion chamber (24) is constituted by the top of a condensate heat exchanger, which top is optionally profiled in trough shape.
47. A gas burner according to any of claims 1 to 46, characterized in that the annular holder (7) which holds the burner plate (1) is separated by insulation (23) from the concentric cylindrical wall (26) which encloses the combustion chamber (24) (Figure 3).
48. A gas burner according to any of claims 1 to 47, characterized in that the plate (10) which closes the mixture chamber (6) and through which the mixture duct (3) extends carries an insulating layer on its outside (top side).
49. A gas burner according to any of claims 1 to 48, characterized in that that portion of the housing top wall (40) which encloses the holder (7) for the burner plate (1) is filled with insulating material (Figures 6, 9, 14, 15, 21).
50. A gas burner according to any of the preceding claims, characterized in that an igniting electrode (42) extends through the mixture chamber (6) and is surrounded within the mixture chamber (6) by a protective tube (69), which is connected to the closing plate (10) and the burner plate (1).
EP87730086A 1986-07-28 1987-07-28 Gas burner Expired - Lifetime EP0255472B1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
AT2023/86 1986-07-28
AT202386A AT393018B (en) 1986-07-28 1986-07-28 Gas burner
DE19868631542 DE8631542U1 (en) 1986-11-25 1986-11-25
DE8631542U 1986-11-25
AT53287A AT388793B (en) 1987-03-06 1987-03-06 Device for fastening a burner plate, through which pass fuel outlet orifices, of a surface burner
AT532/87 1987-03-06
AT1889/87 1987-07-24
AT188987A AT391189B (en) 1987-07-24 1987-07-24 Gas burner, in particular downdraught burner

Publications (3)

Publication Number Publication Date
EP0255472A2 EP0255472A2 (en) 1988-02-03
EP0255472A3 EP0255472A3 (en) 1989-01-25
EP0255472B1 true EP0255472B1 (en) 1991-02-13

Family

ID=27421257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87730086A Expired - Lifetime EP0255472B1 (en) 1986-07-28 1987-07-28 Gas burner

Country Status (4)

Country Link
EP (1) EP0255472B1 (en)
AT (1) ATE60882T1 (en)
DE (1) DE3768021D1 (en)
ES (1) ES2021388B3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672664B1 (en) * 1991-02-07 1993-07-16 Dietrich Thermique COMPACT CAST IRON BURNER OF THE TOTAL PREMIX TYPE.
CN105402726A (en) * 2015-12-29 2016-03-16 云南航天工业有限公司 Gas headwind injection gas mixing combustor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2211107A5 (en) * 1972-12-15 1974-07-12 Cepem
FR2292928A1 (en) * 1974-11-29 1976-06-25 Int Magna Corp Gas torch supplied from bottle - has burner formed of cylindrical cup fitted with replaceable screens
US4039275A (en) * 1976-02-23 1977-08-02 Mcgettrick Charles A Infrared energy generator with orifice plate
IT1141852B (en) * 1980-03-12 1986-10-08 Silvio Polidoro INFRARED GAS BURNER TURNED DOWN

Also Published As

Publication number Publication date
ATE60882T1 (en) 1991-02-15
EP0255472A3 (en) 1989-01-25
DE3768021D1 (en) 1991-03-21
ES2021388B3 (en) 1991-11-01
EP0255472A2 (en) 1988-02-03

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