EP0360090A1 - Gas-fired boiler with an atmospherical burner - Google Patents

Gas-fired boiler with an atmospherical burner Download PDF

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Publication number
EP0360090A1
EP0360090A1 EP89116600A EP89116600A EP0360090A1 EP 0360090 A1 EP0360090 A1 EP 0360090A1 EP 89116600 A EP89116600 A EP 89116600A EP 89116600 A EP89116600 A EP 89116600A EP 0360090 A1 EP0360090 A1 EP 0360090A1
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EP
European Patent Office
Prior art keywords
gas
insert
burner
shell
displacer
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EP89116600A
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German (de)
French (fr)
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EP0360090B1 (en
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Hans Dr. Viessmann
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Publication of EP0360090A1 publication Critical patent/EP0360090A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H2230/00—Solid fuel fired boiler

Definitions

  • the invention relates to a gas boiler with an atmospheric burner according to the preamble of the main claim.
  • a gas boiler of this type is known from FR-A-20 86 966. Furthermore, a relevant gas boiler according to DE-U-80 02 621 is known. A gas boiler according to DE-A-22 89 019 has a similar structure.
  • the displacer body of the boiler according to DE-U-80 02 621 is a kind of pot-shaped combustion chamber which, with its open end, faces the atmospheric gas burner arranged underneath is directed. The heat transfer to the heat transfer medium can therefore only take place via the ribbed shaft walls, and since this displacer insert cannot be cooled and thus becomes very hot, this displacer can also have a non-NOX-reducing effect on the combustion process.
  • a water-carrying sheet metal cylinder is used in the burner shaft, occupying practically its entire height, which is connected to the water-carrying double wall of the burner shaft with supply and return connections.
  • the outer wall of the cylinder is covered with longitudinal ribs formed and attached from special profiles.
  • This cylindrical displacement insert is particularly thermally highly stressed on the inflow side and is therefore also inevitably exposed to condensate attacks, whereby, as far as heat transfer is concerned, an imbalance between the non-finned, water-cooled combustion chamber on the one hand and the externally finned, water-cooled displacement insert on the other consists.
  • FR-A-20 86 966 does not show how the displacement insert is actually designed to be able to meet all heating requirements, namely a sufficiently long burnout distance, condensate resistance, NOX reduction with the largest possible heat transfer area and still simple production.
  • the invention is therefore based on the object of improving a gas boiler of the generic type in such a way that, in the case of condensate-resistant design of its hot gas-charged areas, the central shaft area within the fins also, as in the case of the boiler according to FR-A-20 86 966, for heat transfer to the heat transfer medium can be used with the proviso that these elements involved in their manufacture and assembly can be made condensate-proof in a simple manner and at the same time have a NOX-reducing effect on the combustion process, the production of the displacement insert also taking into account environmentally friendly aspects.
  • the principle of a water-carrying displacement insert is therefore not simple, which would be obvious, in such a way that the displacement insert according to FR-A-20 86 966 is replaced by one made of cast iron, but this displacement insert is made of two liquid-tight materials joinable shells formed, which are "green shaped” formed of condensate-resistant cast. “Green-shaped” is understood to mean that the casting can be formed without a core, ie the positive model of the two shells is designed in such a way that it can be removed from the molding sand and no cores of molding sand are arranged between the two molding sand parts Need to become.
  • the entire displacement insert is therefore very easy to produce by casting, which can be kept considerably shorter or smaller than the displacement insert according to FR-A-20 86 due to the fact that the combustion chamber wall should also be provided with longitudinal ribs 966.
  • the gas boiler consists of a cylindrical, water-cooled burner shaft 1, in the lowest area of which the atmospheric gas burner 2 and, via this, a displacer insert 4, which is circular in cross-section and is delimited by ribbing and is delimited by ribbing, is connected to the water-cooled burner shaft 1 and above it there is an exhaust gas collection chamber 5 with a central exhaust gas outlet connection.
  • the displacer insert 4 is formed from two shells 6, 7 which can be joined together in a liquid-tight manner and which are “green-shaped” and are formed from condensate-resistant cast.
  • the lower, burner-side shell 6 has a sprue extension 8 for connecting the inflow channel 9, which connects the displacement insert 4 with the water-carrying double jacket of the combustion shaft 1.
  • two or three inflow channels 9, correspondingly distributed over the circumference, can also be provided. In the embodiment shown in FIG.
  • the upper shell 7 is formed as a pot 7 'and this is inserted into the likewise cup-shaped lower shell 6, the peripheral edge 20 of the upper shell 7' being placed on the peripheral edge 21 of the lower shell in a sealed manner
  • Case is provided both with the connection extension 8 for the lower inflow channel 9 and for the upper outflow channel 10.
  • both the lower shell 6 is provided with radially outwardly directed longitudinal ribs 12 and the combustion chamber wall 14 is provided with radially inwardly directed longitudinal ribs 15, the ribs 12 engaging in the spaces between the ribs 15.
  • the lower shells 6 in all of the exemplary embodiments are provided with cast-on heat transfer surface enlargements 11 in the form of knobs 17 on their bottom wall 16, which can easily be taken into account in the production of the lower shell 6, since this makes the molding from casting material readily and allows without much effort.
  • the gas boiler is designed such that the upper shell 7, which is designed as a pot and is inserted into the lower shell 6, has a circumferential edge 21 which bulges back in the direction of its base 16, and the connecting extension 8 for the upper outflow channel 10 has.
  • the curved peripheral edge 21 also has radially outwardly directed longitudinal ribs 12 '.
  • the upper shell 7 is also provided with radially outwardly directed longitudinal ribs 12.
  • the upper shell 7 is, as shown, designed as an arch 18 over the opening 18 of the lower, cup-shaped shell 6, which is provided with an outflow region 19 rising to the outflow channel connection 10.
  • Such a shaping can also be carried out without a core, with only the hole for the connection of the upper overflow channel 10 having to be drilled out.
  • the connection extension 8 on the lower shell 6 points downwards and the overflow channel 9 is connected very deeply, as can be seen, to the water-carrying double wall of the combustion shaft 1.
  • the two shells 6, 7 are connected to one another at their connecting edges 22, which of course have to be machined accordingly, with screws 23, including an annular seal 24.
  • FIG. 6 it is also possible, and this also applies to the embodiment of FIG. 7, to provide the connecting edges 22 of the two shells 6, 7 with internal and external threads 25 and to screw the two shells together in a sealed manner.
  • the installation in the combustion shaft 1 takes place, of course, in the screwed-together state of the displacer body 4.
  • the displacer body 4 has a pot-like upper bowl 7 projecting into the interior of the lower bowl 6, as is the case with the exemplary embodiments according to FIGS.
  • the combustion shaft wall 14 is double-walled, that is, according to the exemplary embodiment, the combustion shaft wall is formed from individual cast rings 14 ', on which the radially inward directed longitudinal ribs 15 are cast with.
  • the inflow and outflow ducts 9, 10, like the combustion shaft wall 14 are double-walled.
  • the inner channel piece is sealed and screwed into the molded-on connection extension 8 of the displacement insert 4, the outer channel piece 28 then simply being pushed over the opening 27 in the combustion shaft wall 14.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Incineration Of Waste (AREA)
  • Devices For Medical Bathing And Washing (AREA)

Abstract

The gas-fired boiler with an atmospheric burner consists of a cylindrical, water-cooled combustion shaft (1), in the lowermost region of which there are arranged the atmospheric gas burner (2) and there above a displacer insert (4), which bounds a hot gas drawing duct (3) having an annular cross-section and subdivided by ribbing, and is connected to the water-cooled combustion shaft (1), and above which a waste gas collecting chamber (5) with waste gas exhaust nozzles is located. According to the invention, the displacer insert (4) is formed from two shells (6, 7), which can be assembled in a liquid-tight fashion and are formed from a condensate-proof casting "released in the green state". In this arrangement, the lower shell (6) on the burner side has at least one cast-on projection (8) for the connection of at least one inflow duct (9), which connects the displacer insert (4) to the water-conducting double jacket of the combustion shaft (1). The lower (6) or the upper shell (7) likewise have at least one cast-on projection (8) for the connection of at least one inflow duct (10), which connects the displacer insert (4) to the water-conducting double jacket of the combustion shaft (1). The lower shell (6) is provided, at least in the region of the hot gas duct (3), which has a circular cross-section, with cast-on enlargements (11) of the heat transfer surfaces in the form of longitudinal ribs (12), which engage the interstices (13) of longitudinal ribs (15) arranged on the burner shaft wall (14). <IMAGE>

Description

Die Erfindung betrifft einen Gasheizkessel mit atmosphärischem Brenner gemäß Oberbegriff des Hauptanspruches.The invention relates to a gas boiler with an atmospheric burner according to the preamble of the main claim.

Ein Gasheizkessel dieser Art ist nach der FR-A-20 86 966 bekannt. Ferner ist ein einschlägiger Gasheizkessel nach dem DE-­U-80 02 621 bekannt. Einen ähnlichen Aufbau hat auch ein Gas­heizkessel nach der DE-A-22 89 019. Beim Verdrängerkorper des Heizkessels nach dem DE-U-80 02 621 handelt es sich um eine Art topfförmige Brennkammer, die mit ihrem offenen Ende gegen den darunter angeordneten atmosphärischen Gasbrenner gerichtet ist. Die Wärmeübertragung an das Wärineträgermedium kann hierbei also ausschließlich über die innenberippten Schachtwandungen erfol­gen, und da dieser Verdrängereinsatz nicht kühlbar ist und somit sehr heiß wird, kann mit diesem Verdrängerkörper auch nicht NOX-­reduzierend auf den Verbrennungsvorgang eingewirkt werden. Beim einleitend genannten Heizkessel nach der FR-A-20 86 966 ist im Brennschacht, praktisch dessen ganze Höhe einnehmend, ein was­serführender Blechzylinder eingesetzt, der mit Vor- und Rück­laufanschlüssen mit der wasserführenden Doppelwand des Brenn­schachtes in Verbindung steht. Die Außenwand des Zylinders ist dabei mit aus speziellen Profilen gebildeten und aufgesetzten Längsrippen besetzt. Dieser zylindrische Verdrängereinsatz ist insbesondere anströmseitig thermisch hoch belastet und damit auch unvermeidbar Kondensatangriffen ausgesetzt, wobei, was die Wärmeübertragung betrifft, gewissermaßen eine Unbalance zwischen nichtberipptem, wassergekühltem Brennschacht einerseits und an­dererseits dem außenberippten, wassergekuhlten Verdrängereinsatz besteht. Wie der Verdrängereinsatz tatsächlich ausgebildet ist, um allen heiztechnischen Erfordernissen genügen zu können, näm­lich ausreichend lange Ausbrennstrecke, Kondensatfestigkeit, NOX-Reduzierung bei möglichst grober Wärmeübertragungsfläche und trotzdem einfacher Fertigung, ist der FR-A-20 86 966 nicht zu entnehmen.A gas boiler of this type is known from FR-A-20 86 966. Furthermore, a relevant gas boiler according to DE-U-80 02 621 is known. A gas boiler according to DE-A-22 89 019 has a similar structure. The displacer body of the boiler according to DE-U-80 02 621 is a kind of pot-shaped combustion chamber which, with its open end, faces the atmospheric gas burner arranged underneath is directed. The heat transfer to the heat transfer medium can therefore only take place via the ribbed shaft walls, and since this displacer insert cannot be cooled and thus becomes very hot, this displacer can also have a non-NOX-reducing effect on the combustion process. In the boiler mentioned in the introduction according to FR-A-20 86 966, a water-carrying sheet metal cylinder is used in the burner shaft, occupying practically its entire height, which is connected to the water-carrying double wall of the burner shaft with supply and return connections. The outer wall of the cylinder is covered with longitudinal ribs formed and attached from special profiles. This cylindrical displacement insert is particularly thermally highly stressed on the inflow side and is therefore also inevitably exposed to condensate attacks, whereby, as far as heat transfer is concerned, an imbalance between the non-finned, water-cooled combustion chamber on the one hand and the externally finned, water-cooled displacement insert on the other consists. FR-A-20 86 966 does not show how the displacement insert is actually designed to be able to meet all heating requirements, namely a sufficiently long burnout distance, condensate resistance, NOX reduction with the largest possible heat transfer area and still simple production.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, einen Gas­heizkessel der gattungsgemäßen Art dahingehend zu verbessern, dar bei kondensatfester Ausbildung seiner heizgasbeaufschlagten Bereiche der zentrale Schachtbereich innerhalb der Berippung ebenfalls, wie beim Kessel nach der FR-A-20 86 966, zur Wärme­übertragung an das Wärmeträgermedium ausgenutzt werden kann und zwar mit der Maßgabe, auch diese daran beteiligten Elemente hin­sichtlich ihrer Fertigung und Montage auf einfache Weise konden­satfest zu gestalten und gleichzeitig NOX-reduzierend auf den Verbrennungsvorgang einzuwirken, wobei auch die Fertigung des Verdrängereinsatzes umweltschonenden Gesichtspunkten Rechnung tragen soll.The invention is therefore based on the object of improving a gas boiler of the generic type in such a way that, in the case of condensate-resistant design of its hot gas-charged areas, the central shaft area within the fins also, as in the case of the boiler according to FR-A-20 86 966, for heat transfer to the heat transfer medium can be used with the proviso that these elements involved in their manufacture and assembly can be made condensate-proof in a simple manner and at the same time have a NOX-reducing effect on the combustion process, the production of the displacement insert also taking into account environmentally friendly aspects.

Diese Aufgabe ist mit einem atmosphärischen Gasheizkessel der eingangs genannten Art nach der Erfindung durch die im Kennzei­chen des Hauptanspruches angeführten Merkmale gelöst Vorteil­hafte Weiterbildungen und praktische Ausführungsformen ergeben sich nach den Unteransprüchen.This object is achieved with an atmospheric gas boiler of the type mentioned according to the invention by the features stated in the characterizing part of the main claim. Advantageous further developments and practical embodiments result from the subclaims.

Bei dieser erfindungsgemäßen Lösung ist also nicht einfach, was naheliegend wäre, das Prinzip eines wasserführenden Verdrän­gereinsatzes in der Weise übernommen, dar der Verdrängereinsatz nach der FR-A-20 86 966 durch einen solchen aus Guß ersetzt ist, sondern dieser Verdrängereinsatz ist aus zwei flüssigkeitsdicht zusammenfügbaren Schalen gebildet, die "grün ausgeformt" aus kondensatfestem Guß gebildet sind. Unter "grün ausgeformt" ist dabei zu verstehen, daß die Gußausformung ohne Kern erfolgen kann, d.h. das Positivmodell der beiden Schalen ist so gestal­tet, daß es aus dem Formsand entnommen werden kann und zwischen den beiden Formsandteilen keine Kerne aus Formsand angeordnet werden müssen. Dies hat seine umweltschonende Bedeutung darin, daß kein durch die notwendigen Bindemittel giftiger Formsand für die Ausbildung der Kerne erforderlich ist, der entweder in auf­wendiger Weise entgiftet oder auf Sonderdeponien abgelagert wer­den muß. Außerdem lassen sich "grün ausgeformte" Teile rationel­ler fertigen als Teile, die mit Kernen hergestellt werden müs­sen. Die Ausformung des Verdrängereinsatzes aus Guß hat gleich­zeitig den Vorteil, daß gleichzeitig mit dessen Gießherstellung alle anderen notwendigen Ausformungen, wie Angußfortsätze für den Anschluß der Zu- und Abströmkanäle, Rippenausbildungen oder sonstige übertragungsflächenvergrößerungen beim Gießen gleich mit hergestellt werden können. Der ganze Verdrängereinsatz ist also abgesehen von seinem kondensatgünstigen Verhalten denkbar einfach durch Gießen herzustellen, der durch die Maßgabe, daß auch die Brennschachtwand mit Längsrippen versehen sein soll, wesentlich kürzer bzw. kleiner gehalten werden kann als der Ver­drängereinsatz nach der FR-A-20 86 966.In this solution according to the invention, the principle of a water-carrying displacement insert is therefore not simple, which would be obvious, in such a way that the displacement insert according to FR-A-20 86 966 is replaced by one made of cast iron, but this displacement insert is made of two liquid-tight materials joinable shells formed, which are "green shaped" formed of condensate-resistant cast. “Green-shaped” is understood to mean that the casting can be formed without a core, ie the positive model of the two shells is designed in such a way that it can be removed from the molding sand and no cores of molding sand are arranged between the two molding sand parts Need to become. This has its environmentally friendly importance in that no molding sand that is toxic due to the necessary binders is required for the formation of the cores, which must either be detoxified in a complex manner or deposited in special landfills. In addition, "green shaped" parts can be manufactured more efficiently than parts that have to be produced with cores. The shaping of the displacer insert made of cast iron has the advantage that, at the same time as it is being cast, all the other necessary moldings, such as sprue extensions for connecting the inflow and outflow ducts, ribs or other transfer area enlargements during casting, can be produced at the same time. Apart from its condensate-favorable behavior, the entire displacement insert is therefore very easy to produce by casting, which can be kept considerably shorter or smaller than the displacement insert according to FR-A-20 86 due to the fact that the combustion chamber wall should also be provided with longitudinal ribs 966.

Der erfindungsgemäße Gasheizkessel, vorteilhafte Weiterbildungen und seine praktischen Ausführungsformen nach den Unteransprüchen werden nachfolgend anhand der zeichnerischen Darstellung von Ausführungsbeispielen näher erläutert.The gas boiler according to the invention, advantageous developments and its practical embodiments according to the subclaims are explained in more detail below with the aid of exemplary embodiments.

Es zeigt

  • Fig. 1 einen Längsschnitt durch eine Ausführungsform des Gasheizkessels;
  • Fig. 2 einen Querschnitt durch den Gasheizkessel gemäß Fig. 1;
  • Fig. 3 einen Längsschnitt durch den Gasheizkessel in einer weiteren Ausführungsform;
  • Fig. 4-6 Teilschnitte durch besondere Ausführungsformen;
  • Fig. 7 einen weiteren Längsschnitt durch den Gasheizkessel in einer weiteren Ausführungsform und
  • Fig. 8 einen Teilschnitt durch einen doppelwandig ausgebil­deten Zuströmkanal.
It shows
  • 1 shows a longitudinal section through an embodiment of the gas boiler.
  • FIG. 2 shows a cross section through the gas boiler according to FIG. 1;
  • 3 shows a longitudinal section through the gas boiler in a further embodiment.
  • Fig. 4-6 partial sections through special embodiments;
  • Fig. 7 shows a further longitudinal section through the gas boiler in a further embodiment and
  • Fig. 8 is a partial section through a double-walled inflow channel.

Der Gasheizkessel besteht aus einem zylindrischen, wassergekühl­ten Brennschacht 1, in dessen untersten Bereich der atmosphäri­sche Gasbrenner 2 und über diesen ein einen im Querschnitt ring­förmigen, durch Verrippung gegliederten Heiztgaszugkanal 3 be­grenzender, mit dem wassergekühlten Brennschacht 1 in Verbindung stehender Verdrängereinsatz 4 angeordnet ist über dem sich eine Abgassammelkammer 5 mit zentrischem Abgasabzugsstutzen befindet.The gas boiler consists of a cylindrical, water-cooled burner shaft 1, in the lowest area of which the atmospheric gas burner 2 and, via this, a displacer insert 4, which is circular in cross-section and is delimited by ribbing and is delimited by ribbing, is connected to the water-cooled burner shaft 1 and above it there is an exhaust gas collection chamber 5 with a central exhaust gas outlet connection.

Für einen solchen Gasheizkessel ist nun wesentlich, daß der Ver­drängereinsatz 4, wie aus Fig. 1 ersichtlich, aus zwei flüssig­keitsdicht zusammenfügbaren Schalen 6, 7 gebildet ist die "grün ausgeformt" aus kondensatfestem Guß gebildet sind. Die untere, brennerseitige Schale 6 weist dabei einen Angußfortsatz 8 für den Anschluß des Zuströmkanales 9 auf, der den Verdrängereinsatz 4 mit dem wasserführenden Doppelmantel des Brennschachtes 1 ver­bindet. Erforderlichenfalls können natürlich auch zwei oder drei Zuströmkanäle 9, entsprechend auf den Umfang verteilt, vorgese­hen werden. Beim Ausführungsbeispiel gemäß Fig. 1 ist die obere Schale 7 als Topf 7′ ausgebildet und dieser in die ebenfalls topfförmige untere Schale 6 eingesetzt, wobei der Umfangsrand 20 der oberen Schale 7′ auf den Umfangsrand 21 der unteren Schale abgedichtet aufgesetzt ist, die in diesem Falle sowohl mit dem Anschlußfortsatz 8 für den unteren Zuströmkanal 9 als auch für den oberen Abströmkanal 10 versehen ist. Wie aus Fig. 2 ersicht­lich, ist sowohl die untere Schale 6 mit radial nach außen ge­richteten Längsrippen 12 als auch die Brennschachtwand 14 mit radial nach innen gerichteten Längsrippen 15 versehen, wobei die Rippen 12 in die Zwischenräume zwischen den Rippen 15 eingrei­fen. Dadurch wird vorteilhaft eine bessere Wärmeübergangsbalance im ganzen ringförmigen Heizgaszugkanal 3 erreicht, da den durch­strömenden Heizgasen nach beiden Seiten gleichmäßig Wärme entzo­ gen wird, was mit einer intensiven Abkühlung und damit auch NOX-­Reduzierung verbunden ist. Zwecks Wärmeübertragungsvergrößerung sind bei allen Ausführungsbeispielen die unteren Schalen 6 und zwar an ihrer Bodenwand 16 mit angegossenen Wärmeübertragungs­flächevergrößerungen 11 in Form von Noppen 17 versehen, die problemlos bei der Herstellung der unteren Schale 6 mit berück­sichtigt werden können, da dies die Ausformung aus Gußmaterial ohne weiteres und ohne großen Aufwand zuläßt.For such a gas boiler, it is now essential that the displacer insert 4, as can be seen in FIG. 1, is formed from two shells 6, 7 which can be joined together in a liquid-tight manner and which are “green-shaped” and are formed from condensate-resistant cast. The lower, burner-side shell 6 has a sprue extension 8 for connecting the inflow channel 9, which connects the displacement insert 4 with the water-carrying double jacket of the combustion shaft 1. If necessary, of course, two or three inflow channels 9, correspondingly distributed over the circumference, can also be provided. In the embodiment shown in FIG. 1, the upper shell 7 is formed as a pot 7 'and this is inserted into the likewise cup-shaped lower shell 6, the peripheral edge 20 of the upper shell 7' being placed on the peripheral edge 21 of the lower shell in a sealed manner Case is provided both with the connection extension 8 for the lower inflow channel 9 and for the upper outflow channel 10. As can be seen from FIG. 2, both the lower shell 6 is provided with radially outwardly directed longitudinal ribs 12 and the combustion chamber wall 14 is provided with radially inwardly directed longitudinal ribs 15, the ribs 12 engaging in the spaces between the ribs 15. As a result, a better heat transfer balance is advantageously achieved in the entire annular heating gas duct 3, since the heating gases flowing through uniformly remove heat on both sides What is associated with intensive cooling and thus NOx reduction. For the purpose of heat transfer enlargement, the lower shells 6 in all of the exemplary embodiments are provided with cast-on heat transfer surface enlargements 11 in the form of knobs 17 on their bottom wall 16, which can easily be taken into account in the production of the lower shell 6, since this makes the molding from casting material readily and allows without much effort.

Bei den Ausführungsbeispielen nach den Fig. 3 bis 6 ist der Gas­heizkessel derart ausgebildet, daß die obere, als Topf ausgebil­dete und in die untere Schale 6 eingesetzte Schale 7 einen in Richtung ihres Bodens 16 zurückgewölbten Umfangsrand 21 und die­ser den Anschlußfortsatz 8 für den oberen Abströmkanal 10 auf­weist. Besonders deutlich ist dies in den Fig. 4 und 6 darge­stellt, aus denen auch ersichtlich ist, daß der zurückgewölbte Umfangsrand 21 ebenfalls radial nach außen gerichtete Längsrip­pen 12′ aufweist. Dies hat den Vorteil, daß die Länge der Längs­rippen 12, die sich ja nach Möglichkeit über die ganze Länge des ringförmigen Heizgaszuges 3 erstrecken sollen, für die beidne Schalen reduziert werden kann, was die Ausformung des Positivmo­dells aus dem Formsand erleichtert, was ja im Bereich der Längs­rippen besonders kritisch ist. Gleiches gilt auch für das Aus­führungsbeispiel nach Fig. 7, bei dem ebenfalls die Obere Schale 7 mit radial nach außen gerichteten Längsrippen 12 versehen ist. Bei diesem Ausführungsbeispiel ist übrigens die obere Schale 7, wie dargestellt, als die Öffnung 18 der unteren, topfförmigen Schale 6 überwölbende Schale ausgebildet, die mit einem zum Ab­strömkanalanschluß 10 ansteigenden Abströmbereich 19 versehen ist. Auch eine solche Ausformung kann problemlos ohne Kern er­folgen, wobei lediglich die Bohrung für den Anschluß des oberen überströmkanales 10 aufgebohrt werden muß. Der Anschlußfortsatz 8 an der unteren Schale 6 weist nach unten und der überströmka­nal 9 ist hierbei sehr tief, wie ersichtlich, an der wasserfüh­renden Doppelwand des Brennschachtes 1 angeschlossen.In the exemplary embodiments according to FIGS. 3 to 6, the gas boiler is designed such that the upper shell 7, which is designed as a pot and is inserted into the lower shell 6, has a circumferential edge 21 which bulges back in the direction of its base 16, and the connecting extension 8 for the upper outflow channel 10 has. This is particularly clearly shown in Figs. 4 and 6, from which it can also be seen that the curved peripheral edge 21 also has radially outwardly directed longitudinal ribs 12 '. This has the advantage that the length of the longitudinal ribs 12, which should extend as far as possible over the entire length of the annular heating gas flue 3, can be reduced for the two shells, which facilitates the formation of the positive model from the molding sand, which is indeed in the area the longitudinal ribs are particularly critical. The same also applies to the exemplary embodiment according to FIG. 7, in which the upper shell 7 is also provided with radially outwardly directed longitudinal ribs 12. In this exemplary embodiment, the upper shell 7 is, as shown, designed as an arch 18 over the opening 18 of the lower, cup-shaped shell 6, which is provided with an outflow region 19 rising to the outflow channel connection 10. Such a shaping can also be carried out without a core, with only the hole for the connection of the upper overflow channel 10 having to be drilled out. The connection extension 8 on the lower shell 6 points downwards and the overflow channel 9 is connected very deeply, as can be seen, to the water-carrying double wall of the combustion shaft 1.

Beim Ausführungsbeispiel nach Fig. 1 und 3 bis 5 sind die beiden Schalen 6, 7 an ihren Anschlußrändern 22, die natürlich entspre­chend bearbeitet sein müssen, mit Schrauben 23 unter Einschluß einer Ringdichtung 24 miteinander verbunden. Gemäß Fig. 6 ist es aber auch möglich, und dies gilt auch für das Ausführungsbei­spiel zu Fig. 7, die Anschlußränder 22 der beiden Schalen 6, 7 mit Innen- und Außengewinde 25 zu versehen und beide Schalen miteinander abgedichtet zu verschrauben. Der Einbau in den Brennschacht 1 erfolgt natürlich im zusammengeschraubten Zustand des Verdrängerkörpers 4. Soweit der Verdrängerkörper 4 eine topfartige, in den Innenraum der unteren Schale 6 einragende obere Schale 7 aufweist, wie dies bei den Ausführungsbeispielen nach den Fig. 1, 3 der Fall ist, so ist der Innenraum 26 der topfartigen oberen Schale 7 zur Abgassammelkammer 5 hin mit ei­nem Deckel 27 verschlossen. Diese Ausführungsformen haben übri­gens den Vorteil eines relativ geringen wasserführenden Innen­raumes 26′ im Verdrängerkörper, wodurch sich relativ hohe Durch­strömgeschwindigkeiten für das Wärmeträgermedium und damit eine entsprechend intensive Kühlung des Verdrängereinsatzes 4 erge­ben.In the embodiment of FIGS. 1 and 3 to 5, the two shells 6, 7 are connected to one another at their connecting edges 22, which of course have to be machined accordingly, with screws 23, including an annular seal 24. According to FIG. 6, it is also possible, and this also applies to the embodiment of FIG. 7, to provide the connecting edges 22 of the two shells 6, 7 with internal and external threads 25 and to screw the two shells together in a sealed manner. The installation in the combustion shaft 1 takes place, of course, in the screwed-together state of the displacer body 4. As far as the displacer body 4 has a pot-like upper bowl 7 projecting into the interior of the lower bowl 6, as is the case with the exemplary embodiments according to FIGS. 1, 3 , the interior 26 of the pot-like upper shell 7 is closed towards the exhaust gas collecting chamber 5 with a cover 27. Incidentally, these embodiments have the advantage of a relatively small water-carrying interior 26 'in the displacer, which results in relatively high flow rates for the heat transfer medium and thus a correspondingly intensive cooling of the displacer insert 4.

Wie insbesondere aus Fig. 4, 6 ersichtlich, ist in Rücksicht auf die angestrebte Kondensatsicherheit des ganzen Kessels auf der Gasseite die Brennschachtwand 14 doppelwandig ausgebildet, d.h., gemäß Ausführungsbeispiel ist hierbei die Brennschachtwand aus einzelnen Gußringen 14′ gebildet, an denen die radial nach innen gerichteten Längsrippen 15 mit angegossen sind. Ebenso in Rück­sicht auf eine kondensatfeste Ausbildung sind die Zu- und Ab­strömkanäle 9, 10 ebenfalls wie die Brennschachtwand 14 doppel­wandig ausgebildet. Das Innere Kanalstück ist dabei abgedichtet in den mit angegossenen Anschlußfortsatz 8 des Verdrängerein­satzes 4 eingeschraubt, wobei dann das äußere Kanalstück 28 durch die Öffnung 27 in der Brennschachtwand 14 einfach überge­schoben wird. Nach Einschub wird dann das Innere Kanalstück 29 per Schweißnaht 30 an die Schachtwand 14 flüssigkeitsdicht ein­gebunden, nachdem vorher geeignete Dichtungsmasse in die klei­nen, ringförmigen Räume 31 eingebracht wurde. Beim Einschrauben des inneren Kanalstückes 29 in den Anschlußfortsatz 8 wird na­türlich ebenfalls geeignetes Dichtungsmittel mit eingebracht. In Fig. 8 ist zwar nur der Zuströmkanal 9 zum Verdrängereinsatz 4 dargestellt, diese Art der Einbindung gilt aber auch für die Ab­strömkanäle 10.As can be seen in particular from Fig. 4, 6, in consideration of the desired condensate safety of the entire boiler on the gas side, the combustion shaft wall 14 is double-walled, that is, according to the exemplary embodiment, the combustion shaft wall is formed from individual cast rings 14 ', on which the radially inward directed longitudinal ribs 15 are cast with. Likewise with a view to a condensate-proof design, the inflow and outflow ducts 9, 10, like the combustion shaft wall 14, are double-walled. The inner channel piece is sealed and screwed into the molded-on connection extension 8 of the displacement insert 4, the outer channel piece 28 then simply being pushed over the opening 27 in the combustion shaft wall 14. After insertion, the inner channel piece 29 is then connected to the shaft wall 14 in a liquid-tight manner by means of a weld seam 30, after a suitable sealing compound has previously been introduced into the small, annular spaces 31. When screwing in of the inner channel piece 29 in the connection extension 8 is of course also suitable sealant introduced. Although only the inflow channel 9 to the displacement insert 4 is shown in FIG. 8, this type of integration also applies to the outflow channels 10.

Claims (9)

1. Gasheizkessel mit atmosphärischem Brenner, bestehend aus einem zylindrischen, wassergekühlten Brennschacht (1), in dessen unterstem Bereich der atinosphärische Gasbrenner (2) und über diesem ein einen im Querschnitt ringförmigen, durch Verrippung gegliederten Heizgaszugkanal (3) begrenzender, mit dem wassergekühlten Brennschacht (1) in Verbindung ste­hender Verdrängereinsatz (4) angeordnet ist, über dem sich eine Abgassammelkammer mit Abgasabzugsstutzen befindet, dadurch gekennzeichnet,
daß der Verdrängereinsatz (4) aus zwei flüssigkeitsdicht zu­sammengefügten Schalen (6, 7) gebildet ist, die "grün ausge­formt" aus kondensatfestem Guß gebildet sind, daß die untere, brennerseitige Schale (6) einen Angußfort­satz (8) für den Anschluß mindestens eines Zuströmkanals (9) aufweist, der den Verdrängereinsatz (4) mit dem wasserfüh­renden Doppelmantel des Brennschachtes (1) verbindet, daß die untere (6) oder die obere Schale (7) mindestens einen Angußfortsatz (8) für den Anschluß mindestens eines Abströmkanales (10) aufweist, der den Verdrängereinsatz (4) mit dein wasserführenden Doppelmantel des Brennschachtes (1) verbindet, und
daß mindestens die untere Schale (6) mindestens im Bereich des im Querschnitt kreisförmigen Heizgaszuges (3) mit ange­gossenen Wärmeübertragungsflächenvergrößerungen (11) in Form von Längsrippen (12) versehen ist, die in die Zwischenräume (13) von an der Brennschachtwand (14) angeordneten Längsrip­pen (15) eingreifen.1.Gas boiler with atmospheric burner, consisting of a cylindrical, water-cooled burner shaft (1), in the lower area of which the atinospheric gas burner (2) and above this a heating gas draft channel (3) which is ring-shaped in cross-section and is ribbed, with the water-cooled burner shaft (1) a connected displacer insert (4) is arranged, above which there is an exhaust gas collection chamber with exhaust gas outlet connection, characterized in that
that the displacer insert (4) is formed from two liquid-tightly assembled shells (6, 7), which are formed "green" from condensate-proof cast, that the lower, burner-side shell (6) has a sprue extension (8) for connecting at least one inflow channel (9), which connects the displacer insert (4) with the water-carrying double jacket of the combustion shaft (1), that the lower (6) or the upper shell (7) has at least one sprue extension (8) for the connection of at least one outflow channel (10) has, which connects the displacement insert (4) with your water-carrying double jacket of the combustion shaft (1), and
that at least the lower shell (6) is provided, at least in the region of the heating gas flue (3) with a circular cross-section, with cast-on heat transfer surface enlargements (11) in the form of longitudinal ribs (12) which are arranged in the intermediate spaces (13) on the combustion chamber wall (14) Engage the longitudinal ribs (15). 2. Gasheizkessel nach Anspruch 1,
dadurch gekennzeichnet,
daß die untere Schale (6) anströmseitig an ihrer Bodenwand (16) mit angegossenen Wärmeübertragungsflächenvergrößerungen (11) in Form von Noppen (17) versehen ist.2. Gas boiler according to claim 1,
characterized,
that the lower shell (6) on the inflow side on its bottom wall (16) is provided with cast-on heat transfer surface enlargements (11) in the form of knobs (17). 3. Gasheizkessel nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die obere Schale (7) als Topf (7′) ausgebildet und die­ser in die topfförmige, untere Schale (6) eingesetzt ist, wobei der Umfangsrand (20) der oberen Schale (7) auf den Um­fangsrand (21) der unteren Schale (6) abgedichtet aufgesetzt ist, die sowohl mit dem Anschgußfortsatz (8) für den unteren Zuströmkanal (9) als auch für den oberen Abströmkanal (10) versehen ist.3. Gas boiler according to claim 1 or 2,
characterized,
that the upper shell (7) is designed as a pot (7 ') and this is inserted into the cup-shaped, lower shell (6), the peripheral edge (20) of the upper shell (7) on the peripheral edge (21) of the lower shell ( 6) is placed in a sealed manner, which is provided with the connection extension (8) for the lower inflow channel (9) as well as for the upper outflow channel (10). 5. Gasheizkessel nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die obere, als Topf ausgebildete und in die untere Schale (6) eingesetzte Schale (7) einen in Richtung ihres Bodens (16) zurückgewölbten Umfangsrand (21) und dieser den Anschlußfortsatz (8) für den oberen Abströmkanal (10) auf­weist.5. Gas boiler according to claim 1 or 2,
characterized,
that the upper, in the form of a pot and inserted in the lower shell (6) shell (7) has a curved back in the direction of its bottom (16) peripheral edge (21) and this has the connection extension (8) for the upper outflow channel (10). 6. Gasheizkessel nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die beiden Schalen (6, 7) an ihren Anschlußrändern (22) mit Schrauben (23) unter Einschluß einer Ringdichtung (24) miteinander verbunden sind.6. Gas boiler according to one of claims 1 to 5,
characterized,
that the two shells (6, 7) are connected to one another at their connecting edges (22) with screws (23), including an annular seal (24). 7. Gasheizkessel nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Anschlußränder (22) der beiden Schalen (6, 7) mit Innen- und Außengewinde (25) versehen und damit abgedichtet verschraubt sind.7. Gas boiler according to one of claims 1 to 5,
characterized,
that the connecting edges (22) of the two shells (6, 7) are provided with internal and external threads (25) and are therefore screwed in a sealed manner. 8. Gasheizkessel nach einem der Ansprüche 4 bis 7,
dadurch gekennzeichnet,
daß der Innenraum (26) der topfartigen oberen Schale (7) zur Abgassammelkammer (5) hin mit einem Deckel (27) verschlossen ist.8. Gas boiler according to one of claims 4 to 7,
characterized,
that the interior (26) of the pot-like upper shell (7) to the exhaust gas collection chamber (5) is closed with a cover (27). 9. Gasheizkessel nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
daß die Zu- und Abströmkanäle (9, 10) ebenfalls wie die Brennschachtwand (14) doppelwandig ausgebildet sind.9. Gas boiler according to one of claims 1 to 8,
characterized,
that the inflow and outflow channels (9, 10) are also double-walled like the combustion shaft wall (14). 10. Gasheizkessel nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
daß der Verdrängereinsatz (4) die Hälfte oder angenähert die Hälfte der Höhe (H) des Brennschachtes (1) aufweist.10. Gas boiler according to one of claims 1 to 9,
characterized,
that the displacement insert (4) has half or approximately half the height (H) of the burning shaft (1).
EP89116600A 1988-09-14 1989-09-08 Gas-fired boiler with an atmospherical burner Expired - Lifetime EP0360090B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116600T ATE83552T1 (en) 1988-09-14 1989-09-08 GAS BOILER WITH ATMOSPHERIC BURNER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3831237A DE3831237A1 (en) 1988-09-14 1988-09-14 GAS BOILER WITH ATMOSPHERIC BURNER
DE3831237 1988-09-14

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EP0360090A1 true EP0360090A1 (en) 1990-03-28
EP0360090B1 EP0360090B1 (en) 1992-12-16

Family

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Family Applications (1)

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EP (1) EP0360090B1 (en)
AT (1) ATE83552T1 (en)
DE (2) DE3831237A1 (en)
ES (1) ES2037359T3 (en)

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AT411492B (en) * 1999-01-19 2004-01-26 Vaillant Gmbh ARRANGEMENT WITH A WALL HEATER

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8420869U1 (en) * 1984-07-12 1987-07-23 Vießmann, Hans, Dr.h.c., 3559 Battenberg Heating boilers for liquid and gaseous fuels

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Publication number Priority date Publication date Assignee Title
DE451368C (en) * 1927-10-25 Vosswerke Akt Ges Steam bath kettle
FR2086966A5 (en) * 1970-04-15 1971-12-31 Vidalenq Maurice
DE8002621U1 (en) * 1980-02-01 1982-01-14 Vießmann, Hans, 3559 Battenberg HEATING BOILER WITH ATMOSPHERIC GAS BURNER
DE3425667A1 (en) * 1984-07-12 1986-01-23 Hans Dr.h.c. 3559 Battenberg Vießmann Heating boiler for liquid and gaseous fuels

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8420869U1 (en) * 1984-07-12 1987-07-23 Vießmann, Hans, Dr.h.c., 3559 Battenberg Heating boilers for liquid and gaseous fuels

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DE3831237A1 (en) 1990-03-22
EP0360090B1 (en) 1992-12-16
ES2037359T3 (en) 1993-06-16
DE58903021D1 (en) 1993-01-28
ATE83552T1 (en) 1993-01-15

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