EP0913642A2 - Combustion chamber for gas burner from a water heater and a heating apparatus - Google Patents

Combustion chamber for gas burner from a water heater and a heating apparatus Download PDF

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Publication number
EP0913642A2
EP0913642A2 EP98120067A EP98120067A EP0913642A2 EP 0913642 A2 EP0913642 A2 EP 0913642A2 EP 98120067 A EP98120067 A EP 98120067A EP 98120067 A EP98120067 A EP 98120067A EP 0913642 A2 EP0913642 A2 EP 0913642A2
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EP
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Prior art keywords
combustion chamber
convector
thermal insulation
insulation material
chamber according
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Granted
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EP98120067A
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German (de)
French (fr)
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EP0913642A3 (en
EP0913642B1 (en
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Peter Boiger
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F23M5/085—Cooling thereof; Tube walls using air or other gas as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining

Definitions

  • the invention relates to a combustion chamber, in particular for Gas water heaters and gas heater burners that a at least laterally delimiting the combustion chamber, by an air flow cooled combustion chamber wall made of temperature resistant Have thermal insulation, and the combustion chamber lower-lying gas burner and one arranged above it Has hot water heat exchanger.
  • Such an air-cooled combustion chamber is e.g. out DE-PS 3024792 known.
  • microporous soft ceramic Air pockets The temperature resistance of such microporous soft ceramic is only up to approx. 900-1000 ° C given.
  • the invention proposed that in the combustion chamber before the thermal insulation a steel convector with an elastic shape Rib structure is arranged so that a cooling air flow can flow between the thermal insulation material and the convector.
  • the heat is dissipated specifically where the highest undesirable temperature potential acts, namely even before the thermal insulation of the combustion chamber wall.
  • To the Example can be by installing the invention proposed convector reach that temperature the thermal insulation of the combustion chamber wall to around 700-800 ° C is lowered so that in terms of thermal insulation and the physiological tolerance of favorable microporous Soft ceramic materials can be used.
  • a Possibility is to design the convector so that the cooling air flow rising from the bottom to the top Heat exchangers pass into the exhaust gas stream of the combustion chamber is heated with the same so that the Exhaust gas temperature is raised and the exhaust gases, in particular in the exhaust system, do not fall below the dew point, which prevents condensation.
  • the rib structure of the convector may be arranged substantially vertically, whereby the cooling air almost unhindered from bottom to top by the convector can flow.
  • the burner's insulation is completely from one Metal, e.g. Steel sheath, sheathed, becomes the convector preferably designed so that the steel jacket around the edges of the ribs of the thermal insulation Connect the convector to the jacket.
  • Metal e.g. Steel sheath, sheathed
  • the desired heat balance can be obtained in a similar manner taking into account that the distances between the ribs be chosen accordingly.
  • the in accordance with the invention Combustion chamber proposed measures the combustion chamber heat insulation improved.
  • the physiologically used so far and ecologically questionable, respirable particles emitting combustion chamber insulation materials are avoided. They are not liquid fluids for combustion chamber cooling necessary, which reduces costs and undesirable Have functional risks avoided.
  • the invention proposed shape-elastic rib structure of the convector can be inexpensively by a folding process Manufacture sheet steel.
  • the features of the burner proposed according to the invention alternatively allow either an increase in exhaust gas temperature or an increase in water efficiency.
  • Fig. 1 in a cross-sectional view
  • the combustion chamber 1 shown has an overhead one Hot water heat exchanger 4 at least laterally, i.e. in Circumferential direction, surrounding combustion chamber wall, one under the Hot water heat exchanger 4 arranged gas burner 3, a unspecified housing and one with the housing connected exhaust gas guide plate 11 arranged in the exhaust gas path on.
  • Fig. 1 is in a to the left of a vertical dashed line Centerline first embodiment I and one second embodiment II to the right of this line divided.
  • the two embodiments I and II differ that in the left embodiment I the one formed in the form of an elastic rib structure steel convector 6 vertically arranged air channels 9 so has that the cooling air L am flowing therethrough Heat exchanger 4 passed directly into the exhaust gas stream becomes, while in the embodiment shown on the right II the rib structure of the steel convector 7 in this way is designed so that the formed by the rib structure vertical air channels 9 still the cooling air flow L ' through an edge region of the hot water heat exchanger 4 conduct and thereby increase the water efficiency ⁇ .
  • FIG. 1 two embodiments I and II shown in FIG.
  • the combustion chamber 1 has the combustion chamber wall from the outside in one of a steel capsule 8 encased thermal insulation material 5, the air channels 9 mentioned and the above-mentioned, as a shape-elastic rib structure designed, steel convector 6 and 7 respectively.
  • the thermal insulation 5 can in the illustrated Embodiments of the invention from an inexpensive and ecologically and physiologically harmless microporous Soft ceramic material with air pockets, which, however, is not particularly stable thermally. If the Thermal insulation made of a harder ceramic material microporous structure, which can lead to the inside of the Combustion chamber 1 facing wall of the steel jacket 8 possibly omitted if the insulation material is sufficient has mechanical stability.
  • FIG. 1A The section shown in Fig. 1A through the The combustion chamber wall lies in a plane A-A which is shown in FIG. 1 parallel plane, i.e. perpendicular to the cutting plane of Fig. 1.
  • Fig. 1A clearly shows that individual vertical air channels 9 through the rib structure of the elastic convector 6 or 7 are formed so that the cooling air flowing through the channels 9 into a variety individual air flows is divided and the ribs steel convector 6, 7 has a large cooling surface to lend.
  • the number of ribs 10 or the number of individual channels 9 plays a role in the reaching heat balance. It can be clearly seen that the outwardly facing edges of the ribs 10 on the Inner wall of the jacket 8 surrounding the thermal insulation material 5 issue.
  • FIG. 1B The enlarged representation of the combustion chamber wall in Fig. 1B shows the shape-elastic rib structure of the convector 6, 7 more clear.
  • Such a forming an elastic rib structure steel convector can be inexpensive by folding or Pulling a steel sheet to be made.
  • the convector sets up a maximum temperature level the thermal insulation side of less than 700-800 ° C.
  • This form-elastic convector also has a heat-equalizing effect. This is one of the conditions for use of steel as the combustion chamber wall material in gas water heater burners and gas heater burners. So that is the prerequisite for use more cost-effective and Functionally suitable and harmless thermal insulation materials Fulfills.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Gas Burners (AREA)
  • Air Supply (AREA)

Abstract

The combustion chamber (1) in a gas burner assembly has toughened convector, (6,7), with a shape-elastic right angled rib structure, in front of the thermal insulation material (5) at the chamber walls. In operation, the coolant air streams (L,L') can flow through them, to reduce the temp. at the insulation to 700-800 degrees C. The rib structure is formed by folding pleats in a steel plate. The insulation material is a micro-pore soft ceramic.

Description

HINTERGRUNG DER ERFINDUNGBACKGROUND OF THE INVENTION

Die Erfindung betrifft eine Brennkammer, insbesondere für Gas-Warmwasserbereiter- und Gas-Heizungsgerätebrenner, die eine die Brennkammer wenigstens seitlich begrenzende, durch eine Luftströmung gekühlte Brennkammerwand aus temperaturfestem Wärmedämmstoff aufweisen, und die Brennkammer einen tieferliegenden Gasbrenner und einen darüber angeordneten Warmwasser-Wärmeübertrager aufweist.The invention relates to a combustion chamber, in particular for Gas water heaters and gas heater burners that a at least laterally delimiting the combustion chamber, by an air flow cooled combustion chamber wall made of temperature resistant Have thermal insulation, and the combustion chamber lower-lying gas burner and one arranged above it Has hot water heat exchanger.

STAND DER TECHNIKSTATE OF THE ART

Eine derartige luftgekühlte Brennkammer ist z.B. aus DE-PS 3024792 bekannt. Bei dieser bekannten Brennkammer ist zwischen einem Außen- und einem Innenmantel ein belüfteter Zwischenraum ausgebildet, der die Wärmeisolierung des Außenmantels verbessert und der mit Öffnungen versehen ist, so daß ein den Außenmantel vor Überhitzung schützender Luftstrom aufsteigen kann.Such an air-cooled combustion chamber is e.g. out DE-PS 3024792 known. In this known combustion chamber a ventilated between an outer and an inner jacket Intermediate space formed by the thermal insulation of the Improved outer jacket and which is provided with openings, so that the outer jacket protects against overheating Airflow can rise.

Bei zur Zeit entwickelten Brennkammern werden Maßnahmen angestrebt, die die bisher zumeist aus physiologisch und ökologisch bedenklichen Faserstoffen bestehenden Wärmedämmstoffe durch preiswerte andere Wärmedämmstoffe ersetzen sollen, wie z.B. durch mikroporöse Weichkeramik mit Lufteinschlüssen. Die Temperaturbeständigkeit solcher mikroporöser Weichkeramik ist jedoch nur bis ca. 900-1000°C gegeben. Measures are being taken in combustion chambers that are currently being developed sought, which so far mostly from physiological and existing thermal insulation materials replace with inexpensive other thermal insulation materials such as thanks to microporous soft ceramic Air pockets. The temperature resistance of such microporous soft ceramic is only up to approx. 900-1000 ° C given.

KURZFASSUNG DER ERFINDUNGSUMMARY OF THE INVENTION

Es ist somit Aufgabe der Erfindung, eine gattungsgemäße Brennkammer derart zu gestalten, daß für die Brennkammerisolierung ein physiologisch unbedenklicher Wärmedämmstoff eingesetzt werden kann, indem die auf ihn wirkende Temperaturbelastung so weit abgesenkt wird, daß dieser Wärmedämmstoff zumindest über die Lebensdauer eines Gaswarmwasserbereiter- oder Gas-Heizungsgerätebrenners aufrecht erhalten bleibt.It is therefore an object of the invention, a generic To design the combustion chamber so that for the combustion chamber insulation a physiologically harmless thermal insulation material can be used by the one acting on it Temperature load is reduced so far that this Thermal insulation at least over the life of a Gas water heater or gas heater burner is maintained.

Um diese Aufgabe zu lösen wird erfindungsgemäß vorgeschlagen, daß in der Brennkammer vor dem Wärmedämmstoff ein stählerner Konvektor mit formelastischer Rippenstruktur angeordnet ist, so daß ein Kühlluftstrom zwischen dem Wärmedämmstoff und dem Konvektor strömen kann.To solve this problem, the invention proposed that in the combustion chamber before the thermal insulation a steel convector with an elastic shape Rib structure is arranged so that a cooling air flow can flow between the thermal insulation material and the convector.

Auf diese Weise wird die Wärme gezielt dort abgeführt, wo das höchste unerwünschte Temperaturpotential wirkt, nämlich bereits vor dem Wärmedämmstoff der Brennkammerwand. Zum Beispiel läßt sich durch den Einbau des erfindungsgemäß vorgeschlagenen Konvektors erreichen, daß die Temperatur an dem Wärmedämmstoff der Brennkammerwand auf etwa 700-800°C abgesenkt wird, so daß die hinsichtlich der Wärmedämmung und der physiologischen Verträglichkeit günstigen mikroporösen Weichkeramikmaterialien einsetzbar sind. Eine Möglichkeit besteht darin, den Konvektor so zu gestalten, daß der von unten nach oben aufsteigende Kühlluftstrom am Wärmeübertrager vorbei in den Abgasstrom der Brennkammer unter Erwärmung desselben geleitet wird, so daß die Abgastemperatur angehoben wird und die Abgase, insbesondere in der Abgasführung, nicht den Taupunkt unterschreiten, womit eine Kondensatbildung vermieden ist. In this way, the heat is dissipated specifically where the highest undesirable temperature potential acts, namely even before the thermal insulation of the combustion chamber wall. To the Example can be by installing the invention proposed convector reach that temperature the thermal insulation of the combustion chamber wall to around 700-800 ° C is lowered so that in terms of thermal insulation and the physiological tolerance of favorable microporous Soft ceramic materials can be used. A Possibility is to design the convector so that the cooling air flow rising from the bottom to the top Heat exchangers pass into the exhaust gas stream of the combustion chamber is heated with the same so that the Exhaust gas temperature is raised and the exhaust gases, in particular in the exhaust system, do not fall below the dew point, which prevents condensation.

Eine Alternative dazu ist, den Konvektor derart zu gestalten, daß der Kühlluftstrom einen Randabschnitt des Wärmeübertragers durchströmt und damit den Wasserwirkungsgrad η steigert.An alternative is to use the convector in this way shape that the cooling air flow an edge portion of the Flows through heat exchanger and thus the water efficiency η increases.

Es kann günstig sein, die Rippenstruktur des Konvektors im wesentlichen senkrecht anzuordnen, wodurch die Kühlluft nahezu ungehindert von unten nach oben durch den Konvektor strömen kann.It may be convenient to use the rib structure of the convector to be arranged substantially vertically, whereby the cooling air almost unhindered from bottom to top by the convector can flow.

Wenn der Wärmedämmstoff des Brenners vollständig von einem Metall, z.B. Stahlmantel, ummantelt ist, wird der Konvektor bevorzugt so gestaltet, daß die zum stählernen Mantel um den Wärmedämmstoff weisenden Kanten der Rippen des Konvektors am Mantel anschließen.If the burner's insulation is completely from one Metal, e.g. Steel sheath, sheathed, becomes the convector preferably designed so that the steel jacket around the edges of the ribs of the thermal insulation Connect the convector to the jacket.

Auch bei Verwendung eines geeigneten härteren alternativen mikroporösen Wärmedämmstoffs ist der Konvektor so gestaltet, daß die zum Wärmedämmstoff weisenden Kanten der Rippen des Konvektors am Wärmedämmstoff anstehen.Even when using a suitable harder alternative micro-porous thermal insulation is the convector designed that the edges facing the thermal insulation The convector ribs are against the thermal insulation material.

Bei der Herstellung eines solchen erfindungsgemäß verwendeten stählernen Konvektors kann es vorteilhaft sein, die Rippenstruktur durch einen Falzvorgang oder durch Ziehen aus einem Stahlblech zu formen.In the manufacture of such an invention steel convector used, it may be advantageous the rib structure by a folding process or by Pull to shape from a steel sheet.

In diesem Fall läßt sich in Abhängigkeit vom gewünschten Ziel in der Wärmebilanz die Weite eines beim Falzvorgang gebildeten Spalts zwischen den Rippenwänden, der zum Inneren der Brennkammer hinweist, wählen.In this case, depending on what you want Target in the heat balance the width of one during the folding process formed gap between the rib walls, the to Inside the combustion chamber.

In ähnlicher Weise läßt sich der gewünschten Wärmebilanz dadurch Rechnung tragen, daß die Abstände der Rippen entsprechend gewählt werden. The desired heat balance can be obtained in a similar manner taking into account that the distances between the ribs be chosen accordingly.

Allgemein wird durch die bei der erfindungsgemäßen Brennkammer vorgeschlagenen Maßnahmen die Brennkammerwärmeisolierung verbessert. Die bislang verwendeten physiologisch und ökologisch bedenklichen, lungengängige Teilchen emittierende Brennkammerisoliermaterialien sind vermieden. Es sind keine flüssigen Fluide zur Brennkammerkühlung nötig, wodurch sich die Kosten senken und unerwünschte Funktionsrisiken vermeiden lassen. Die erfindungsgemäß vorgeschlagene formelastische Rippenstruktur des Konvektors läßt sich kostengünstig durch einen Falzvorgang aus Stahlblech herstellen.In general, the in accordance with the invention Combustion chamber proposed measures the combustion chamber heat insulation improved. The physiologically used so far and ecologically questionable, respirable particles emitting combustion chamber insulation materials are avoided. They are not liquid fluids for combustion chamber cooling necessary, which reduces costs and undesirable Have functional risks avoided. The invention proposed shape-elastic rib structure of the convector can be inexpensively by a folding process Manufacture sheet steel.

Die erfindungsgemäß vorgeschlagenen Merkmale des Brenners ermöglichen alternativ entweder eine Abgastemperaturerhöhung oder eine Erhöhung des Wasserwirkungsgrads.The features of the burner proposed according to the invention alternatively allow either an increase in exhaust gas temperature or an increase in water efficiency.

Die obigen vorteilhaften Merkmale werden anhand der nachstehenden Beschreibung bevorzugter Ausführungsformen der erfindungsgemäßen Brennkammer noch deutlicher, wenn diese Beschreibung unter Bezug auf die beiliegende Zeichnung gelesen wird.The above advantageous features are based on the Description of preferred embodiments below the combustion chamber according to the invention even more clearly if this description with reference to the accompanying Drawing is read.

ZEICHNUNGDRAWING

  • Fig. 1 zeigt schematisch einen Querschnitt durch eine erfindungsgemäße Brennkammer und zwar links eine Ausführungsform I und rechts eine alternative Ausführungsform II;Fig. 1 shows schematically a cross section through a combustion chamber according to the invention, namely a left Embodiment I and an alternative embodiment on the right II;
  • Fig. 1A zeigt einen schematischen Schnitt durch eine erfindungsgemäß gestaltete Brennkammerwand, wobei die Schnittebene A-A senkrecht zur Schnittebene in Fig. 1 liegt; undFig. 1A shows a schematic section through a Combustion chamber wall designed according to the invention, the Section plane A-A perpendicular to the section plane in FIG. 1 lies; and
  • Fig. 1B zeigt vergrößert einen Ausschnitt der in Fig. 1A im Schnitt gezeigten Brennkammerwand.Fig. 1B shows an enlarged section of the in Fig. 1A in Section shown combustion chamber wall.

    • Die in Fig. 1 schematisch in einer Querschnittsansicht dargestellte Brennkammer 1 weist eine einen obenliegenden Warmwasser-Wärmeübertrager 4 wenigstens seitlich, d.h. in Umfangsrichtung, umgebende Brennkammerwand, einen unter dem Warmwasser-Wärmeübertrager 4 angeordneten Gasbrenner 3, ein nicht näher bezeichnetes Gehäuse und ein mit dem Gehäuse verbundenes, im Abgasweg angeordnetes Abgasleitblech 11 auf. Bezogen auf die Brennkammerwand ist Fig. 1 in eine links von einer strichpunktiert gezeichneten senkrechten Mittellinie liegende erste Ausführungsform I und eine rechts von dieser Linie liegende zweite Ausführungsform II unterteilt. Die beiden Ausführungsformen I und II unterscheiden sich darin, daß bei der linken Ausführungsform I der in Form einer formelastischen Rippenstruktur gebildete stählerne Konvektor 6 senkrecht angeordnete Luftkanäle 9 so aufweist, daß die hindurchströmende kühlende Luft L am Wärmeübertrager 4 vorbei direkt in den Abgasstrom geleitet wird, während bei der rechts gezeigten Ausführungsform II die Rippenstruktur des stählernen Konvektors 7 derart gestaltet ist, daß die durch die Rippenstruktur gebildeten senkrechten Luftkanäle 9 den kühlenden Luftstrom L' noch durch einen Randbereich des Warmwasser-Wärmeübertragers 4 leiten und dadurch den Wasserwirkungsgrad η erhöhen. In beiden, in Fig. 1 dargestellten Ausführungsformen I und II der erfindungsgemäßen Brennkammer 1 weist die Brennkammerwand von außen nach innen einen von einer stählernen Kapsel 8 ummantelten Wärmedämmstoff 5, die genannten Luftkanäle 9 und den oben erwähnten, als formelastische Rippenstruktur gestalteten, stählernen Konvektor 6 bzw. 7 auf.The schematically in Fig. 1 in a cross-sectional view The combustion chamber 1 shown has an overhead one Hot water heat exchanger 4 at least laterally, i.e. in Circumferential direction, surrounding combustion chamber wall, one under the Hot water heat exchanger 4 arranged gas burner 3, a unspecified housing and one with the housing connected exhaust gas guide plate 11 arranged in the exhaust gas path on. In relation to the combustion chamber wall, Fig. 1 is in a to the left of a vertical dashed line Centerline first embodiment I and one second embodiment II to the right of this line divided. The two embodiments I and II differ that in the left embodiment I the one formed in the form of an elastic rib structure steel convector 6 vertically arranged air channels 9 so has that the cooling air L am flowing therethrough Heat exchanger 4 passed directly into the exhaust gas stream becomes, while in the embodiment shown on the right II the rib structure of the steel convector 7 in this way is designed so that the formed by the rib structure vertical air channels 9 still the cooling air flow L ' through an edge region of the hot water heat exchanger 4 conduct and thereby increase the water efficiency η. In two embodiments I and II shown in FIG. 1 the combustion chamber 1 according to the invention has the combustion chamber wall from the outside in one of a steel capsule 8 encased thermal insulation material 5, the air channels 9 mentioned and the above-mentioned, as a shape-elastic rib structure designed, steel convector 6 and 7 respectively.

    Der Wärmedammstoff 5 kann bei den dargestellten Ausführungsformen der Erfindung aus einem kostengünstigen und ökologisch und physiologisch unbedenklichen mikroporösen Weichkeramikstoff mit Lufteinschlüssen bestehen, der jedoch thermisch nicht besonders stabil ist. Wenn der Wärmedämmstoff aus einem härteren Keramikmaterial mit mikroporöser Struktur besteht, kann die zum Inneren der Brennkammer 1 weisende Wand des stählernen Mantels 8 gegebenenfalls entfallen, wenn der Dämmstoff genügende mechanische Stabilität aufweist.The thermal insulation 5 can in the illustrated Embodiments of the invention from an inexpensive and ecologically and physiologically harmless microporous Soft ceramic material with air pockets, which, however, is not particularly stable thermally. If the Thermal insulation made of a harder ceramic material microporous structure, which can lead to the inside of the Combustion chamber 1 facing wall of the steel jacket 8 possibly omitted if the insulation material is sufficient has mechanical stability.

    Der in Fig. 1A dargestellte Schnitt durch die Brennkammerwand liegt in einer zur Ebene A-A, die in Fig. 1 gezeigt ist, parallelen Ebene, d.h. senkrecht zur Schnittebene der Fig. 1. Fig. 1A zeigt deutlich, daß einzelne senkrechte Luftkanäle 9 durch die Rippenstruktur des formelastischen Konvektors 6 oder 7 gebildet werden, so daß die durch die Kanäle 9 strömende Kühlluft in eine Vielzahl einzelner Luftströme unterteilt ist und die Rippen dem stählernen Konvektor 6, 7 eine große Kühloberfläche verleihen. Die Anzahl der Rippen 10 bzw. die Anzahl der einzelnen Kanäle 9 spielt eine Rolle bei der zu erreichenden Wärmebilanz. Es ist deutlich zu erkennen, daß die nach außen weisenden Kanten der Rippen 10 an der Innenwand des den Wärmedämmstoff 5 umgebenden Mantels 8 anliegen.The section shown in Fig. 1A through the The combustion chamber wall lies in a plane A-A which is shown in FIG. 1 parallel plane, i.e. perpendicular to the cutting plane of Fig. 1. Fig. 1A clearly shows that individual vertical air channels 9 through the rib structure of the elastic convector 6 or 7 are formed so that the cooling air flowing through the channels 9 into a variety individual air flows is divided and the ribs steel convector 6, 7 has a large cooling surface to lend. The number of ribs 10 or the number of individual channels 9 plays a role in the reaching heat balance. It can be clearly seen that the outwardly facing edges of the ribs 10 on the Inner wall of the jacket 8 surrounding the thermal insulation material 5 issue.

    Die vergrößerte Darstellung der Brennkammerwand in Fig. 1B zeigt die formelastische Rippenstruktur des Konvektors 6, 7 deutlicher. Zum Inneren der Brennkammer 1 hin können die Wände der Rippen 10, 10' jeweils einen Spalt 12 bilden, dessen Weite S bzw. S' in Abhängigkeit von dem zu erreichenden Ziel bei der Wärmebilanz angepaßt werden kann. Ein solcher eine formelastische Rippenstruktur bildender stählerner Konvektor kann kostengünstig durch Falzen oder Ziehen eines Stahlblechs hergestellt werden.The enlarged representation of the combustion chamber wall in Fig. 1B shows the shape-elastic rib structure of the convector 6, 7 more clear. Towards the interior of the combustion chamber 1 Walls of the ribs 10, 10 'each form a gap 12, its width S or S 'depending on that reaching target in the heat balance can be adjusted. Such a forming an elastic rib structure steel convector can be inexpensive by folding or Pulling a steel sheet to be made.

    Durch diesen erfindungsgemäß vorgesehenen, formelastischen Konvektor stellt sich ein maximales Temperaturniveau auf der Wärmedämmstoffseite von weniger als 700-800°C ein. Dieser formelastische Konvektor wirkt zudem wärmespannungsausgleichend. Dies ist eine der Bedingungen für den Einsatz von Stahl als Brennkammerwandmaterial bei Gas-Warmwasserbereiterbrennern und Gas-Heizungsgerätebrennern. Damit ist die Voraussetzung für den Einsatz kostengünstiger und funktionell geeigneter sowie unbedenklicher Wärmedämmstoffe erfüllt.Through this shape-elastic provided according to the invention The convector sets up a maximum temperature level the thermal insulation side of less than 700-800 ° C. This form-elastic convector also has a heat-equalizing effect. This is one of the conditions for use of steel as the combustion chamber wall material in gas water heater burners and gas heater burners. So that is the prerequisite for use more cost-effective and Functionally suitable and harmless thermal insulation materials Fulfills.

    Mit den oben beschriebenen und in Fig. 1 als Ausführungsform I und Ausführungsform II dargestellten Gestaltungen des aus einer formelastischen Rippenstruktur bestehenden stählernen Konvektors läßt sich entweder die Abgastemperatur erhöhen (Alternative I) oder der Wasserwirkungsgrad η erhöhen (Alternative II). Insgesamt wird damit der Wirkungsgrad eines Gas-Warmwasserbereiterbrenners oder Gas-Heizungsgerätebrenners erhöht. Durch die Anhebung der Abgastemperatur bei der Alternative I kann z.B. die Wärmeübertragerfläche des Wärmeübertragers 4 größer dimensioniert werden, so daß wieder die minimal notwendige Abgastemperatur erreicht wird, womit in derselben Zeit mehr Wasser mit derselben Temperatur erhitzt werden kann. Aus Untersuchungen ist bekannt, daß bei Wassererhitzern für den Hausgebrauch ein Anteil von etwa 10% Kühlluft am gesamten Abgasmassenstrom optimal ist. Damit wird einerseits eine ausreichende Kühlung der die äußere Brennkammerwand bildenden Wärmedämmstoffe erzielt und andererseits die Abgastemperatur des Wassererhitzers erhöht (Alternative I).With those described above and in Fig. 1 as Embodiment I and embodiment II shown Designs of a form-elastic rib structure existing steel convector can either the Increase exhaust gas temperature (alternative I) or Increase water efficiency η (alternative II). All in all becomes the efficiency of a gas water heater burner or gas heater burner increased. Through the Raising the exhaust gas temperature with alternative I can e.g. the heat exchanger surface of the heat exchanger 4 be dimensioned larger, so that again the minimal necessary exhaust gas temperature is reached, with what in heated more water at the same temperature at the same time can be. It is known from studies that at Water heaters for home use account for about 10% cooling air on the total exhaust gas mass flow is optimal. On the one hand, sufficient cooling of the thermal insulation materials forming the outer wall of the combustion chamber and on the other hand the exhaust gas temperature of the water heater increased (alternative I).

    Physiologisch und ökologisch bedenkliche Brennkammerisoliermaterialien, die lungengängige Teilchen emittieren, sind durch den erfindungsgemäßen Vorschlag gänzlich vermieden. Insgesamt werden physiologisch unbedenkliche und kostengünstige Werkstoffe verwendet.Physiologically and ecologically questionable combustion chamber insulation materials, which emit respirable particles, are entirely by the proposal of the invention avoided. Overall, physiologically safe and inexpensive materials used.

    Claims (10)

    Brennkammer, insbesondere für Gas-Warmwasserbereiter- und Gas-Heizungsgerätebrenner, die eine die Brennkammer (1) wenigstens seitlich begrenzende, durch eine Luftströmung (L, L') gekühlte Brennkammerwand (5, 6, 7, 8) aus temperaturfestem Wärmedämmstoff aufweisen, und die Brennkammer (1) einen tieferliegenden Gasbrenner (3) und einen darüber angeordneten Warmwasser-Wärmeübertrager (4) aufweist,
    dadurch gekennzeichnet, daß in der Brennkammer (1) vor dem Wärmedämmstoff (5) ein stählerner Konvektor (6; 7) mit einer formelastischen Rippenstruktur (10; 10') angeordnet ist, der im Betrieb von einem Kühlluftstrom (L, L') durchströmt werden kann.    Combustion chamber, in particular for gas water heaters and gas heating device burners, which have a combustion chamber wall (5, 6, 7, 8) made of temperature-resistant thermal insulation material and at least laterally delimiting the combustion chamber (1, L '), and the combustion chamber (1) has a lower-lying gas burner (3) and a hot water heat exchanger (4) arranged above it,
    characterized in that a steel convector (6; 7) with an elastic rib structure (10; 10 ') is arranged in the combustion chamber (1) in front of the thermal insulation material (5) and flows through a cooling air flow (L, L') during operation can be.         Brennkammer nach Anspruch 1, dadurch gekennzeichnet, daß der Konvektor (6; 7) derart gestaltet ist, daß die Temperatur an dem Wärmedämmstoff der Brennkammerwand auf etwa 700-800°C abgesenkt ist.Combustion chamber according to Claim 1, characterized in that the convector (6; 7) is designed in such a way that the temperature on the thermal insulation material of the combustion chamber wall is reduced to approximately 700-800 ° C. Brennkammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Konvektor (6) derart gestaltet ist, daß der Kühlluftstrom (L) am Wärmeübertrager (4) vorbei in den Abgasstrom der Brennkammer (1) unter Erwärmung desselben geleitet wird (Fig. 1 I).Combustion chamber according to claim 1 or 2, characterized in that the convector (6) is designed such that the cooling air flow (L) is passed past the heat exchanger (4) into the exhaust gas flow of the combustion chamber (1) while heating the same (Fig. 1 I ). Brennkammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Konvektor (7) derart gestaltet ist, daß der Kühlluftstrom (L') einen Randabschnitt des Wärmeübertragers (4) durchströmt (Fig. 1 II). Combustion chamber according to claim 1 or 2, characterized in that the convector (7) is designed such that the cooling air flow (L ') flows through an edge section of the heat exchanger (4) (Fig. 1 II). Brennkammer nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Rippenstruktur (10, 10') des Konvektors (6, 7) im wesentlichen senkrecht angeordnet ist.Combustion chamber according to one of the preceding claims, characterized in that the rib structure (10, 10 ') of the convector (6, 7) is arranged essentially vertically. Brennkammer nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Wärmedämmstoff (5) vollständig von einem stählernen Mantel (8) umgeben ist und daß die zum Mantel (8) weisenden Kanten der Rippen (10, 10') des Konvektors (6, 7) am Mantel anschließen.Combustion chamber according to one of the preceding claims, characterized in that the thermal insulation material (5) is completely surrounded by a steel jacket (8) and that the edges of the ribs (10, 10 ') of the convector (6, 7) facing the jacket (8) ) connect to the jacket. Brennkammer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Wärmedämmstoff (5) zum Konvektor hin freiliegt und daß die Kanten der Rippen (10, 10') desselben am Wärmedämmstoff anstehen.Combustion chamber according to one of claims 1 to 5, characterized in that the thermal insulation material (5) is exposed towards the convector and that the edges of the ribs (10, 10 ') of the same lie on the thermal insulation material. Brennkammer nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Rippen (10, 10') des Konvektors (6, 7) durch Falzen oder Ziehen eines Stahlblechs gebildet sind.Combustion chamber according to one of the preceding claims, characterized in that the ribs (10, 10 ') of the convector (6, 7) are formed by folding or pulling a steel sheet. Brennkammer nach Anspruch 8, dadurch gekennzeichnet, daß die Weite (S, S') eines beim Falz- oder Ziehvorgang gebildeten, zum Inneren der Brennkammer weisenden Spalts (12) zwischen den Rippenwänden in Abhängigkeit vom gewünschten Ziel in der Wärmebilanz einstellbar ist.Combustion chamber according to Claim 8, characterized in that the width (S, S ') of a gap (12) formed during the folding or drawing process and pointing towards the interior of the combustion chamber between the rib walls can be adjusted as a function of the desired target in the heat balance. Brennkammer nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Abstände zwischen den Rippen (10) und damit die Weite der luftdurchströmten Kanäle des Konvektors (6, 7) abhängig vom gewünschten Ziel in der Wärmebilanz einstellbar ist.Combustion chamber according to one of the preceding claims, characterized in that the distances between the ribs (10) and thus the width of the air-flow channels of the convector (6, 7) can be adjusted depending on the desired target in the heat balance.
    EP98120067A 1997-10-31 1998-10-23 Combustion chamber for gas burner from a water heater and a heating apparatus Expired - Lifetime EP0913642B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19748261A DE19748261B4 (en) 1997-10-31 1997-10-31 Combustion chamber, especially for gas water heaters and gas heater burners
    DE19748261 1997-10-31

    Publications (3)

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    EP0913642A2 true EP0913642A2 (en) 1999-05-06
    EP0913642A3 EP0913642A3 (en) 2000-05-03
    EP0913642B1 EP0913642B1 (en) 2003-09-03

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    EP98120067A Expired - Lifetime EP0913642B1 (en) 1997-10-31 1998-10-23 Combustion chamber for gas burner from a water heater and a heating apparatus

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    AT (1) ATE249012T1 (en)
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    Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE3024792C2 (en) 1979-07-13 1988-09-08 E.L.M. Leblanc, Drancy, Fr

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4020772A (en) * 1976-01-22 1977-05-03 The Lummus Company Process to protect process heater casing from corrosion
    US4501232A (en) * 1983-10-03 1985-02-26 Purex Pool Products, Inc. Pool or spa water heater
    DE4119993A1 (en) * 1991-06-18 1992-12-24 Forsch Anorganische Werkstoffe Kiln cladding - has separately exchangeable ceramic plates fitted to inner kiln cladding by ceramic mountings
    AT400485B (en) * 1992-04-07 1996-01-25 Vaillant Gmbh UNCOOLED COMBUSTION CHAMBER FOR GUIDING COMBUSTION GASES FROM A BURNER
    DE19601012A1 (en) * 1996-01-13 1997-07-17 Bosch Gmbh Robert Method to raise exhaust temperature on gas or oil fired water heater

    Patent Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE3024792C2 (en) 1979-07-13 1988-09-08 E.L.M. Leblanc, Drancy, Fr

    Also Published As

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    EP0913642A3 (en) 2000-05-03
    DE19748261A1 (en) 1999-07-01
    EP0913642B1 (en) 2003-09-03
    DE59809474D1 (en) 2003-10-09
    DE19748261B4 (en) 2004-11-11
    ATE249012T1 (en) 2003-09-15

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