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EP0554541B1 - Burner cylinder for premixing forced draught burners of gas heating apparatus - Google Patents

Burner cylinder for premixing forced draught burners of gas heating apparatus Download PDF

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Publication number
EP0554541B1
EP0554541B1 EP92120802A EP92120802A EP0554541B1 EP 0554541 B1 EP0554541 B1 EP 0554541B1 EP 92120802 A EP92120802 A EP 92120802A EP 92120802 A EP92120802 A EP 92120802A EP 0554541 B1 EP0554541 B1 EP 0554541B1
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EP
European Patent Office
Prior art keywords
cylinder
cover
connecting flange
plate
combustion
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
EP92120802A
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German (de)
French (fr)
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EP0554541A3 (en
EP0554541A2 (en
Inventor
Adolf Heeb
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.)
Hoval Interliz AG
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Hoval Interliz AG
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Publication date
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Publication of EP0554541A2 publication Critical patent/EP0554541A2/en
Publication of EP0554541A3 publication Critical patent/EP0554541A3/en
Application granted granted Critical
Publication of EP0554541B1 publication Critical patent/EP0554541B1/en
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    • 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
    • F23D14/46—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2211/00—Thermal dilatation prevention or compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the invention relates to a combustion cylinder for premixed forced draft burners of gas heating devices according to the preamble of the main claim.
  • combustion cylinders are e.g. known from EP-A-0 309 838.
  • fan burners are used in which a mixture of fuel gas and air, which is usually pre-stoichiometrically pre-mixed before the flame is formed, is fed to a preferably arranged hanging cylinder in the gas heater, which has the outer wall of a flame holding cylinder made of perforated heat-resistant sheet metal material, on which the flame formation takes place .
  • a modern development of the aforementioned combustion cylinder has two further cylinders, likewise made of perforated heat-resistant sheet metal material, namely in the flame holding cylinder with a radial distance a distribution cylinder and in this with a radial distance a throttle cylinder.
  • connection flange which contains the opening for the entry of the mixture into the combustion cylinder
  • cover which closes the opposite end of the combustion cylinder
  • the connection flange and the cover being formed with three concentric annular grooves into which the three cylinders with their edges are inserted.
  • the outer flame holding cylinder is fastened at both edges in the annular groove of the connection flange and the cover by means of several radial screw bolts in order to hold the connection flange and the cover and thus the entire combustion cylinder together.
  • the distribution cylinder and the throttle cylinder are usually only attached to their lower edge in the ring grooves of the cover by means of the radial screw bolts and axially movable at the upper edge in the ring grooves of the connection flange, so that the connection flange and cover can change their distance from one another when the outer flame holding cylinder, which is most subjected to temperature changes, changes its axial length. It is necessary to also seal the edges of the flame holding cylinder fastened in the ring grooves of the connecting flange and the cover by inlaid, high-temperature-resistant special seals, since gas leaks at the bordered edges of the flame holding cylinder would considerably disrupt the flame formation and the combustion.
  • the construction and assembly of the known fuel cylinder are also relatively complex due to the formation of the cast flange and the cast cover with three concentric receiving ring grooves for all three sheet metal cylinders and by attaching the sheet metal cylinder in the receiving grooves by means of several radial bolts.
  • the invention therefore has for its object to design the fuel cylinder of the type mentioned in such a way that both the flame holding cylinder and the distribution cylinder on both edges with a secure gas-tight connection, which does not necessarily have to have an axial mobility of the cylinder edges, to the connecting flange and the lid is connected and the strongly heated flame holding cylinder can still perform sufficient axial elongation to avoid mechanical stress cracks.
  • the manufacture and assembly of the combustion cylinder should be made easier.
  • combustion cylinder design according to the invention is described in more detail below with reference to the embodiment shown in the drawing in axial longitudinal section.
  • the combustion cylinder has at its upper end a conical connecting flange 1, which has the opening 14 for the entry of the combustible mixture into the combustion cylinder contains, and at its lower end a closed cover 2. Between the connecting flange 1 and the cover 2, an outer flame holding cylinder 3, a middle distribution cylinder 4 and an inner throttle cylinder 5 are arranged. These three cylinders are made of perforated, heat-resistant sheet metal and are arranged concentrically with a radial distance from each other.
  • the connecting flange 1 and the cover 2 are not cast parts as in the conventional combustion cylinders described above, but also consist of heat-resistant sheet metal material and are formed by sheet metal drawing, which is much easier and cheaper than the customary production of these two parts of the combustion cylinder from cast iron. This also makes the weight of the combustion cylinder much lighter.
  • the cover 2 consists of two parts, an inner cover plate 7 and an outer cover plate 8. The complete combustion cylinder is held together by the central distribution cylinder 4, which is firmly and essentially sealed to the connecting flange 1 and the inner cover plate 7 on both edges. At the lower edge, the distribution cylinder 4 is fastened to an upward-facing edge flange 15 of the inner cover plate 7 by spot welding.
  • the lower edge of the inner throttle cylinder 5 adjoins the lid inner plate 7 when not fastened.
  • the distribution cylinder 4 and the throttle cylinder 5 are fastened together by spot welding to bolts 12 which can be plugged through bolt holes of the connecting flange 1 in the axial direction of the combustion cylinder and screwed to the connecting flange.
  • bolts 12 can be plugged through bolt holes of the connecting flange 1 in the axial direction of the combustion cylinder and screwed to the connecting flange.
  • the heating and axial expansion of the distribution cylinder 4 during operation of the burner is significantly less than that of the incandescent flame holding cylinder 3, so that the change in distance between the connecting flange 1 and cover 2 is kept correspondingly small and a gap formation between the lower edge of the less than the distribution cylinder is heated and axially expanding throttle cylinder and the cover inner plate 7 arises, the throttle function of the throttle cylinder 5 is not significantly influenced.
  • the extremely strongly heating flame holding cylinder 3 is received on both edges by annular groove-like holders 6 of the connecting flange 1 and the cover 2, in which the flame holding cylinder 3 is axially movable and also radially movable due to the diameter changes which also occur with the temperature changes.
  • the annular groove-like brackets 6 are formed by U-shaped edge flanges 13, which can be produced simply by sheet metal drawing, on the connecting flange 1 consisting of sheet metal and on the cover outer plate 8 made of sheet metal.
  • the inner cover plate 7 fastened to the distribution cylinder 4 and the outer cover plate 8 holding the flame holding cylinder 3 are shown by a Embodiment from a screw 9 arranged at the center of the lid held together by a compression spring 10, by means of which the outer plate 8 can be resiliently pressed off the inner plate 7 is.
  • the axially resilient connection of the two cover plates 7 and 8 expediently additionally includes an anti-rotation device which consists of pins 11 which are fastened to the cover inner plate 7 and engage in guide holes in the cover outer plate 8 with axial displacement.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

The burner cylinder contains, arranged concentrically with one another between a connection flange (1) having the inlet opening, and a closed cover (2), an outer flame-holding cylinder (3), a central distributing cylinder (4) and an inner throttling cylinder (5). The cover (2) consists in two parts of a cover inner plate (7) and a cover outer plate (8). The connection flange (1) and the cover (2) are held together by the central distributing cylinder (4) which is at both edges connected in a rigid and sealed manner to the connection flange (1) and to the cover inner plate (7). The inner throttling cylinder (5) is fastened at one edge in the burner cylinder and unfastened at the other edge. The outer flame holding cylinder (3) is held, axially and radially movably and sealed, in annular-groove-like mountings (6) of the connection flange (1) and of the cover outer plate (8). The two cover plates (7, 8) are held together by a connection, by means of which the cover outer plate (8) can be pressed off the cover inner plate (7) in an elastically flexible manner. <IMAGE>

Description

Die Erfindung betrifft einen Brennzylinder für vormischende Gebläsebrenner von Gasheizgeräten gemäß dem Oberbegriff des Hauptanspruchs. Solche Brennzylinder sind z.B. aus der EP-A-0 309 838 bekannt.The invention relates to a combustion cylinder for premixed forced draft burners of gas heating devices according to the preamble of the main claim. Such combustion cylinders are e.g. known from EP-A-0 309 838.

Beispielsweise bei Gasheizkesseln für Warmwasserheizungsanlagen finden Gebläsebrenner Anwendung, bei denen ein vor der Flammenbildung meistens überstöchiometrisch vorgemischtes Gemisch aus Brenngas und Luft einem vorzugsweise hängend in dem Gasheizgerät angeordneten Brennzylinder zugeführt wird, der als Außenwandung einen Flammenhaltezylinder aus perforiertem hitzebeständigem Blechmaterial besitzt, an dem die Flammenbildung stattfindet. Zur Erzielung einer möglichst gleichmäßigen, homogenen Verteilung des Gemisches auf die gesamte zylindrische Oberfläche des Brennzylinders und zur Erzielung einer Gemischverbrennung mit möglichst niedrigen Stickoxidwerten bei gleichzeitig extrem tiefer Kohlenmonoxidbildung besitzt eine neuzeitliche Weiterentwicklung des vorgenannten Brennzylinders noch zwei weitere, ebenfalls aus perforiertem hitzebeständigem Blechmaterial bestehende Zylinder, und zwar im Flammenhaltezylinder mit radialem Abstand einen Verteilzylinder und in diesem mit radialem Abstand einen Drosselzylinder. Diese drei Zylinder sind zwischen einem Anschlußflansch, der die Öffnung für den Eintritt des Gemisches in den Brennzylinder enthält, und einem das gegenüberliegende Ende des Brennzylinders verschließenden Deckel angeordnet, wobei der Anschlußflansch und der Deckel mit drei konzentrischen Ringnuten ausgebildet sind, in die die drei Zylinder mit ihren Rändern eingeschoben sind. Der äußere Flammenhaltezylinder ist an beiden Rändern in der Ringnut des Anschlußflansches und des Deckels mittels mehrerer radialer Schraubenbolzen befestigt, um den Anschlußflansch und den Deckel und damit den gesamten Brennzylinder zusammenzuhalten. Der Verteilzylinder und der Drosselzylinder sind hingegen bei der meist üblichen hängenden Anordnung des Brennzylinders mit unten liegendem Deckel nur an ihrem unteren Rand in den Ringnuten des Deckels mittels der radialen Schraubenbolzen befestigt und am oberen Rand in den Ringnuten des Anschlußflansches axial beweglich, damit Anschlußflansch und Deckel ihren Abstand voneinander ändern können, wenn der am stärksten durch Temperaturwechsel beanspruchte äußere Flammenhaltezylinder seine axiale Länge verändert. Erforderlich ist es, die in den Ringnuten des Anschlußflansches und des Deckels befestigten Ränder des Flammenhaltezylinders auch durch eingelegte, hochtemperaturbeständige Spezialdichtungen abzudichten, da Gasundichtigkeiten an den eingefaßten Rändern des Flammenhaltezylinders das Flammenbild und die Verbrennung erheblich stören würden. Es hat sich bei dem vorstehend beschriebenen bekannten Brennzylinder gezeigt, daß es zur Erzielung der gewünschten gleichmäßigen Flammenbildung und schadstoffarmen Gemischverbrennung auch wichtig ist, den Verteilzylinder an beiden Rändern in den die Ränder aufnehmenden Ringnuten gasdicht einzufassen, da Undichtigkeiten an den Zylinderrändern die gewünschte und erforderliche Gemischverteilfunktion des Verteilzylinders stören würden. Wegen der durch den intermittierenden Brennerbetrieb ständig auftretenden großen Längenveränderungen des in der Einschaltphase des Brenners glühend sich erhitzenden Flammenhaltezylinders und wegen der damit bei dem bekannten Brennzylinder entsprechend großen Abstandsveränderung zwischen Anschlußflansch und Deckel, die bei größeren Brennzylinderdimensionen für größere Gasheizgeräteleistungen über etwa 40 kW besonders stark wird, ist es bei dem bekannten Brennzylinder ein schwieriges Problem, den axial beweglich von einer Ringnut aufgenommenen Rand des Verteilzylinders, der sich wesentlich weniger als der Flammenhaltezylinder erhitzt und in der Länge verändert, dauerhaft und zuverlässig in der Ringnut gasdicht einzufassen. Die Konstruktion und die Montage des bekannten Brennzylinders sind auch durch die Ausbildung des aus Guß bestehenden Anschlußflansches und des aus Guß bestehenden Deckels mit drei konzentrischen Aufnahmeringnuten für alle drei Blechzylinder sowie durch die Befestigung der Blechzylinder in den Aufnahmenuten mittels mehrerer radialer Schraubenbolzen verhältnismäßig aufwendig.For example, in gas boilers for hot water heating systems, fan burners are used in which a mixture of fuel gas and air, which is usually pre-stoichiometrically pre-mixed before the flame is formed, is fed to a preferably arranged hanging cylinder in the gas heater, which has the outer wall of a flame holding cylinder made of perforated heat-resistant sheet metal material, on which the flame formation takes place . In order to achieve the most uniform, homogeneous distribution of the mixture over the entire cylindrical surface of the combustion cylinder and to achieve mixture combustion with the lowest possible nitrogen oxide values and at the same time extremely low carbon monoxide formation, a modern development of the aforementioned combustion cylinder has two further cylinders, likewise made of perforated heat-resistant sheet metal material, namely in the flame holding cylinder with a radial distance a distribution cylinder and in this with a radial distance a throttle cylinder. These three cylinders are arranged between a connection flange, which contains the opening for the entry of the mixture into the combustion cylinder, and a cover which closes the opposite end of the combustion cylinder, the connection flange and the cover being formed with three concentric annular grooves into which the three cylinders with their edges are inserted. The outer flame holding cylinder is fastened at both edges in the annular groove of the connection flange and the cover by means of several radial screw bolts in order to hold the connection flange and the cover and thus the entire combustion cylinder together. The distribution cylinder and the throttle cylinder, however, are usually only attached to their lower edge in the ring grooves of the cover by means of the radial screw bolts and axially movable at the upper edge in the ring grooves of the connection flange, so that the connection flange and cover can change their distance from one another when the outer flame holding cylinder, which is most subjected to temperature changes, changes its axial length. It is necessary to also seal the edges of the flame holding cylinder fastened in the ring grooves of the connecting flange and the cover by inlaid, high-temperature-resistant special seals, since gas leaks at the bordered edges of the flame holding cylinder would considerably disrupt the flame formation and the combustion. It has been shown in the known combustion cylinder described above that, in order to achieve the desired uniform flame formation and low-pollutant mixture combustion, it is also important to enclose the distribution cylinder in a gas-tight manner on both edges in the ring grooves receiving the edges, since leaks at the cylinder edges provide the desired and required mixture distribution function of the distribution cylinder would interfere. Because of the large changes in length of the flame holding cylinder, which is constantly glowing when the burner is switched on, due to the intermittent operation of the burner, and because of the large change in distance between the connecting flange and cover in the known combustion cylinder, which becomes particularly strong for larger gas cylinder capacities above 40 kW in the case of larger combustion cylinder dimensions , it is a difficult problem with the known combustion cylinder to enclose the axially movable edge of the distribution cylinder, which is heated by a ring groove and which heats up considerably less than the flame holding cylinder and changes in length, permanently and reliably in a gas-tight manner in the ring groove. The construction and assembly of the known fuel cylinder are also relatively complex due to the formation of the cast flange and the cast cover with three concentric receiving ring grooves for all three sheet metal cylinders and by attaching the sheet metal cylinder in the receiving grooves by means of several radial bolts.

Die Erfindung hat daher zur Aufgabe, den Brennzylinder der eingangs genannten Art so auszubilden, daß sowohl der Flammenhaltezylinder als auch der Verteilzylinder an beiden Rändern mit einer sicheren gasdichten Verbindung, die nicht zwingend auch eine axiale Beweglichkeit der Zylinderränder haben muß, an den Anschlußflansch und an den Deckel angeschlossen sind und trotzdem der stark erhitzte Flammenhaltezylinder zur Vermeidung von mechanischen Spannungsrissen eine ausreichende axiale Längendehnung ausführen kann. Außerdem soll die Herstellung und Montage des Brennzylinders einfacher gestaltet werden. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichnungsteil des Hauptanspruchs aufgeführten Ausgestaltungsmerkmale des Brennzylinders gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.The invention therefore has for its object to design the fuel cylinder of the type mentioned in such a way that both the flame holding cylinder and the distribution cylinder on both edges with a secure gas-tight connection, which does not necessarily have to have an axial mobility of the cylinder edges, to the connecting flange and the lid is connected and the strongly heated flame holding cylinder can still perform sufficient axial elongation to avoid mechanical stress cracks. In addition, the manufacture and assembly of the combustion cylinder should be made easier. This object is achieved according to the invention by the design features of the combustion cylinder listed in the characterizing part of the main claim. Advantageous further developments are specified in the subclaims.

Die erfindungsgemäße Brennzylinderausbildung wird nachstehend anhand des in der Zeichnung im axialen Längsschnitt dargestellten Ausführungsbeispiels näher beschrieben.The combustion cylinder design according to the invention is described in more detail below with reference to the embodiment shown in the drawing in axial longitudinal section.

Der Brennzylinder besitzt für die hängende Anordnung in einem Gasheizgerät an seinem oberen Ende einen konischen Anschlußflansch 1, der die Öffnung 14 für den Eintritt des brennbaren Gemisches in den Brennzylinder enthält, und an seinem unteren Ende einen geschlossenen Deckel 2. Zwischen dem Anschlußflansch 1 und dem Deckel 2 sind ein äußerer Flammenhaltezylinder 3, ein mittlerer Verteilzylinder 4 und ein innerer Drosselzylinder 5 angeordnet. Diese drei Zylinder bestehen aus perforiertem hitzebeständigem Blechmaterial und sind konzentrisch mit einem radialen Abstand voneinander angeordnet. Der Anschlußflansch 1 und der Deckel 2 sind keine Gußteile wie bei den eingangs beschriebenen gebräuchlichen Brennzylindern, sondern bestehen ebenfalls aus hitzebeständigem Blechmaterial und sind durch Blechziehen geformt, was wesentlich einfacher und billiger ist als die gebräuchliche Herstellung dieser beiden Teile des Brennzylinders aus Guß. Außerdem wird dadurch auch das Gewicht des Brennzylinders wesentlich leichter. Der Deckel 2 besteht zweiteilig aus einer Deckelinnenplatte 7 und einer Deckelaußenplatte 8. Das Zusammenhalten des kompletten Brennzylinders erfolgt durch den mittleren Verteilzylinder 4, der an beiden Rändern fest und im wesentlichen abgedichtet mit dem Anschlußflansch 1 und der Deckelinnenplatte 7 verbunden ist. Am unteren Rand ist der Verteilzylinder 4 an einer aufwärts gerichteten Randbördelung 15 der Deckelinnenplatte 7 durch eine Punktanschweißung befestigt. Der untere Rand des inneren Drosselzylinders 5 grenzt unbefestigt an die Deckelinnenplatte 7 an. Am oberen Rand sind der Verteilzylinder 4 und der Drosselzylinder 5 gemeinsam durch eine Punktanschweißung an Bolzen 12 befestigt, die in Achsrichtung des Brennzylinders durch Bolzenlöcher des Anschlußflansches 1 hindurchsteckbar und mit dem Anschlußflansch verschraubbar sind. Mittels dieser axialen Schraubenbolzen 12 können die beiden Zylinder 4 und 5 bei der Montage des Brennzylinders bequem mit dem Anschlußflansch 1 verbunden und durch einfaches Heranziehen ihrer Ränder an den Anschlußflansch 1 in eine ausreichend gasdichte Berührung mit dem Anschlußflansch 1 gebracht werden. Die Erwärmung und axiale Ausdehnung des Verteilzylinders 4 beim Betrieb des Brenners ist wesentlich geringer als die des glühend werdenden Flammenhaltezylinders 3, so daß auch die Abstandsveränderung zwischen Anschlußflansch 1 und Deckel 2 entsprechend gering gehalten ist und eine Spaltbildung, die zwischen dem unteren Rand des weniger als der Verteilzylinder sich erwärmenden und axial ausdehnenden Drosselzylinders und der Deckelinnenplatte 7 entsteht, die Drosselfunktion des Drosselzylinders 5 nicht nennenswert beeinflußt. Der extrem stark sich erhitzende Flammenhaltezylinder 3 wird an beiden Rändern von ringnutartigen Halterungen 6 des Anschlußflansches 1 und des Deckels 2 aufgenommen, in denen der Flammenhaltezylinder 3 axial beweglich und wegen der bei den Temperaturveränderungen auch vorkommenden Durchmesseränderungen auch radial beweglich ist. Mittels hochtemperaturbeständiger Dichtmanschetten 16, die die Ränder des Flammenhaltezylinders 3 umfassen, sind die Flammenhaltezylinderränder in den ringnutartigen Halterungen 6 im wesentlichen abgedichtet. Die ringnutartigen Halterungen 6 werden von U-förmigen, an dem aus Blech bestehenden Anschlußflansch 1 und an der aus Blech bestehenden Deckelaußenplatte 8 einfach durch Blechziehen herstellbaren Randumbördelungen 13 gebildet. Damit insbesondere auch bei großen Brennzylinderabmessungen für Gasheizgeräte mit großen Heizleistungen der Flammenhaltezylinder 3 sich frei in axialer Richtung ausdehnen kann und keine Spannungsrisse oder Brüche am Brennzylinder entstehen, sind die am Verteilzylinder 4 befestigte Deckelinnenplatte 7 und die den Flammenhaltezylinder 3 haltende Deckelaußenplatte 8 durch eine beim dargestellten Ausführungsbeispiel aus einer an der Deckelmitte angeordneten Schraube 9 mit einer Druckfeder 10 bestehende Verbindung zusammengehalten, mittels der die Außenplatte 8 federnd nachgiebig von der Innenplatte 7 abdrückbar ist. Selbstverständlich ist es auch möglich, den den Flammenzylinder 3 in einer ringnutartigen Aufnahme haltenden Teil des Deckels 2 im Innern des Brennzylinders direkt mit dem Anschlußflansch 1 so zu verbinden, daß dieser Deckelteil seinen axialen Abstand vom Anschlußflansch 1 federelastisch verändern kann. Bei dem dargestellten Ausführungsbeispiel enthält die axial federnd nachgiebige Verbindung der beiden Deckelplatten 7 und 8 zweckmäßigerweise zusätzlich noch eine Verdrehsicherung, die aus Zapfen 11 besteht, welche an der Deckelinnenplatte 7 befestigt sind und mit axialer Verschieblichkeit in Führungslöcher der Deckelaußenplatte 8 eingreifen.For the hanging arrangement in a gas heater, the combustion cylinder has at its upper end a conical connecting flange 1, which has the opening 14 for the entry of the combustible mixture into the combustion cylinder contains, and at its lower end a closed cover 2. Between the connecting flange 1 and the cover 2, an outer flame holding cylinder 3, a middle distribution cylinder 4 and an inner throttle cylinder 5 are arranged. These three cylinders are made of perforated, heat-resistant sheet metal and are arranged concentrically with a radial distance from each other. The connecting flange 1 and the cover 2 are not cast parts as in the conventional combustion cylinders described above, but also consist of heat-resistant sheet metal material and are formed by sheet metal drawing, which is much easier and cheaper than the customary production of these two parts of the combustion cylinder from cast iron. This also makes the weight of the combustion cylinder much lighter. The cover 2 consists of two parts, an inner cover plate 7 and an outer cover plate 8. The complete combustion cylinder is held together by the central distribution cylinder 4, which is firmly and essentially sealed to the connecting flange 1 and the inner cover plate 7 on both edges. At the lower edge, the distribution cylinder 4 is fastened to an upward-facing edge flange 15 of the inner cover plate 7 by spot welding. The lower edge of the inner throttle cylinder 5 adjoins the lid inner plate 7 when not fastened. At the upper edge, the distribution cylinder 4 and the throttle cylinder 5 are fastened together by spot welding to bolts 12 which can be plugged through bolt holes of the connecting flange 1 in the axial direction of the combustion cylinder and screwed to the connecting flange. By means of these axial screw bolts 12, the two cylinders 4 and 5 can be conveniently connected to the connecting flange 1 during assembly of the combustion cylinder and by simply pulling their edges onto the connecting flange 1 into a sufficiently gas-tight contact with the connecting flange 1 are brought. The heating and axial expansion of the distribution cylinder 4 during operation of the burner is significantly less than that of the incandescent flame holding cylinder 3, so that the change in distance between the connecting flange 1 and cover 2 is kept correspondingly small and a gap formation between the lower edge of the less than the distribution cylinder is heated and axially expanding throttle cylinder and the cover inner plate 7 arises, the throttle function of the throttle cylinder 5 is not significantly influenced. The extremely strongly heating flame holding cylinder 3 is received on both edges by annular groove-like holders 6 of the connecting flange 1 and the cover 2, in which the flame holding cylinder 3 is axially movable and also radially movable due to the diameter changes which also occur with the temperature changes. By means of high-temperature-resistant sealing sleeves 16, which encompass the edges of the flame holding cylinder 3, the flame holding cylinder edges in the annular groove-like holders 6 are essentially sealed. The annular groove-like brackets 6 are formed by U-shaped edge flanges 13, which can be produced simply by sheet metal drawing, on the connecting flange 1 consisting of sheet metal and on the cover outer plate 8 made of sheet metal. To ensure that the flame holding cylinder 3 can expand freely in the axial direction and that there are no stress cracks or breaks in the combustion cylinder, particularly in the case of large combustion cylinder dimensions for gas heaters with high heating outputs, the inner cover plate 7 fastened to the distribution cylinder 4 and the outer cover plate 8 holding the flame holding cylinder 3 are shown by a Embodiment from a screw 9 arranged at the center of the lid held together by a compression spring 10, by means of which the outer plate 8 can be resiliently pressed off the inner plate 7 is. Of course, it is also possible to connect the flame cylinder 3 in an annular groove-like part of the cover 2 inside the combustion cylinder directly to the connection flange 1 so that this cover part can change its axial distance from the connection flange 1 in a resilient manner. In the illustrated embodiment, the axially resilient connection of the two cover plates 7 and 8 expediently additionally includes an anti-rotation device which consists of pins 11 which are fastened to the cover inner plate 7 and engage in guide holes in the cover outer plate 8 with axial displacement.

Claims (4)

  1. Combustion cylinder for premixing blower burners of gas heating devices with a connecting flange (1), which is arranged at one cylinder end as an end wall member and includes the inlet opening of the combustion cylinder for the combustion gas-air mixture, with a closed cover (2) arranged at the other cylinder end as an end wall member and with an outer flame holding cylinder (3), central distributing cylinder (4) and inner throttling cylinder (5) arranged between the two end wall members, whereby the three cylinders, which comprise perforated, heat-resistant plate material, are arranged concentrically and radially spaced from one another, characterised in that the cover (2) is of two-part construction and comprises a cover inner plate (7) and a cover outer plate (8), that the connecting flange (1) and the cover (2) are held together by the central distributing cylinder (4) which is connected rigidly and in a substantially sealed manner at the two edges to the connecting flange and the cover inner plate (7), whereby the inner throttling cylinder (5) is fastened in the combustion cylinder at one edge and is unfastened at the other edge, that the outer flame holding cylinder (3) is mounted at both edges so as to be axially and radially movable and in a substantially sealed manner in annular groove-like mountings (6) on the connecting flange (1) and the cover outer plate (8) and that the two cover plates (7,8) are held together by a connection by means of which the outer plate (8) may be resiliently pressed away from the inner plate (7).
  2. Combustion cylinder as claimed in claim 1, characterised in that the axially resilient connection of the two cover plates (7,8) additionally includes a rotational fastening (11).
  3. Combustion cylinder as claimed in claim 1, characterised in that the distributing cylinder (4) and the throttling cylinder (5) are both secured, preferably at their edge directed towards the connecting flange (1), to bolts (12), which may be screwed to the connecting flange (1) in the axial direction of the combustion cylinder and thereby draw the edges of the two cylinders (4,5) in a sealed manner against the connecting flange (1).
  4. Combustion cylinder as claimed in claim 1, characterised in that the connecting flange (1) and the cover outer plate (2) comprise metal plate and their annular groove-like mountings for the outer flame holding cylinder (3) are formed by U-shaped, bent over edge portions (13) of the two plate members (1,8).
EP92120802A 1992-02-04 1992-12-05 Burner cylinder for premixing forced draught burners of gas heating apparatus Expired - Lifetime EP0554541B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9201313U 1992-02-04
DE9201313U DE9201313U1 (en) 1992-02-04 1992-02-04 Burner cylinders for premixing fan burners of gas heaters

Publications (3)

Publication Number Publication Date
EP0554541A2 EP0554541A2 (en) 1993-08-11
EP0554541A3 EP0554541A3 (en) 1993-09-29
EP0554541B1 true EP0554541B1 (en) 1995-08-23

Family

ID=6875706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120802A Expired - Lifetime EP0554541B1 (en) 1992-02-04 1992-12-05 Burner cylinder for premixing forced draught burners of gas heating apparatus

Country Status (11)

Country Link
EP (1) EP0554541B1 (en)
AT (1) ATE126873T1 (en)
CZ (1) CZ281489B6 (en)
DE (2) DE9201313U1 (en)
DK (1) DK0554541T3 (en)
ES (1) ES2078636T3 (en)
GR (1) GR3018129T3 (en)
HR (1) HRP930100B1 (en)
RU (1) RU2104444C1 (en)
SI (1) SI9300062A (en)
SK (1) SK278762B6 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1292577B1 (en) * 1997-05-23 1999-02-08 Worgas Bruciatori Srl CYLINDRICAL GAS BURNER.
EP0892213A1 (en) * 1997-07-16 1999-01-20 Gianmario Invernizzi A filtering-bed burner and a gas combustion method carried out by it
FR2794222B1 (en) * 1999-05-26 2001-06-29 Alain Boulogne EXPANSION COMPENSATION DEVICE FOR MULTIFLUID RESIDUE BURNERS

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE73217T1 (en) * 1987-09-26 1992-03-15 Ruhrgas Ag GAS BURNER.
DE3831624A1 (en) * 1987-09-26 1989-04-06 Ruhrgas Ag GAS BURNER

Also Published As

Publication number Publication date
CZ281489B6 (en) 1996-10-16
DK0554541T3 (en) 1995-12-27
HRP930100A2 (en) 1994-12-31
HRP930100B1 (en) 1998-02-28
DE9201313U1 (en) 1992-03-26
EP0554541A3 (en) 1993-09-29
EP0554541A2 (en) 1993-08-11
ES2078636T3 (en) 1995-12-16
GR3018129T3 (en) 1996-02-29
SK278762B6 (en) 1998-02-04
CZ386592A3 (en) 1995-06-14
RU2104444C1 (en) 1998-02-10
SI9300062A (en) 1993-09-30
ATE126873T1 (en) 1995-09-15
DE59203387D1 (en) 1995-09-28
SK386592A3 (en) 1993-10-06

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