EP0706014A1 - Heat protection shield for heat exchanger - Google Patents
Heat protection shield for heat exchanger Download PDFInfo
- Publication number
- EP0706014A1 EP0706014A1 EP95111715A EP95111715A EP0706014A1 EP 0706014 A1 EP0706014 A1 EP 0706014A1 EP 95111715 A EP95111715 A EP 95111715A EP 95111715 A EP95111715 A EP 95111715A EP 0706014 A1 EP0706014 A1 EP 0706014A1
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- EP
- European Patent Office
- Prior art keywords
- heat
- protection shield
- heat protection
- heat exchanger
- shield according
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- 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.)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
- F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
Definitions
- the invention relates to a heat shield for heat exchangers with at least one burner chamber into which the open ends of heat exchanger tubes open, openings being provided in the heat shield at the points at which the heat exchanger tubes open into the burner chamber.
- Such a heat shield is used, for example, in a burner chamber of a gas-fired kitchen range.
- the structure of such a range is described, for example, in EP-A-551 807.
- the kitchen stove described there has an oven space through which the heat exchanger tubes pass.
- the open ends of these heat exchanger tubes open into a burner chamber arranged below the furnace chamber. Gas burners are arranged in the burner chamber, the hot combustion gases of which are passed through the heat exchanger tubes.
- EP-A-551 807 proposes that a plurality of interspaces be formed between the burner chamber and the furnace space, one of which is filled with heat-insulating material. In the second space end connecting pieces which are slidably inserted into the open ends of the heat exchanger tubes.
- the object of the present invention is to provide heat protection shields for heat exchangers of the type specified at the outset, in which heat-related tensions can largely be reduced.
- this object is achieved in the case of a generic heat shield by the features of the characterizing part of claim 1. Accordingly, the heat shield is not connected to the walls of the burner chamber and there are separating cuts or dividing lines within the heat shield that at least partially separate the areas around the respective openings. As a result, heat-related stresses in the heat protection shields directly affected by the burner flames are more easily reduced.
- separating cuts can be provided in the heat shield between the individual openings in such a way that the heat-related deformations of the heat shield are eliminated or reduced.
- the separating cuts can run around the respective entire opening, so that the regions of the heat protection shield surrounding the opening form separate plates.
- edge of these separate plates can be shaped such that they overlap when assembled.
- the corresponding edge areas each form shoulders such that correspondingly overlapping edge areas of the following plate can rest on them.
- the plates of the heat protection shield which are not connected to one another can be suspended separately from one another.
- the individual panels can form one level when assembled.
- the individual plates can be suspended from the respective heat exchanger tubes to which their openings belong.
- the individual plates, which are suspended from the respective heat exchanger tubes are conically shaped, so that they protrude like a lampshade into the burner chamber.
- the heat protection shield can consist of two shields lying one on top of the other, but which have the features according to the invention as such.
- the heat protection shield advantageously consists of refractory material, such as refractory ceramic.
- connecting pipes can be attached to the edge of the openings arranged in the heat shield.
- these connecting pipes are basically aligned coaxially with the respective heat exchanger pipes.
- the connection to the respective heat exchanger tubes can be made in different ways.
- the connecting tube can be inserted into the associated heat exchanger tube in the assembled position, the Connection tube with its outer wall rests against the inner wall of the heat exchanger tube, but its longitudinal displaceability in the heat exchanger tube remains guaranteed.
- the connecting pipe and the end of the associated heat exchanger pipe can also have the same diameter and be arranged separately from one another, both of which are surrounded by a corresponding sleeve pipe, which thus forms the connection between the two pipes.
- Either the connecting pipe or the end of the associated heat exchanger pipe or both can also be mounted in a longitudinally displaceable manner in the sleeve pipe.
- the connecting pipe can lie in the assembled state in the respectively assigned heat exchanger pipe, forming an annular gap between the outer surface of the connecting pipe and the inner surface of the heat exchanger pipe.
- a further alternative embodiment can consist in that the connecting pipe has a larger diameter than the heat exchanger pipe and is therefore outside the end of the respectively assigned heat exchanger pipe.
- An annular gap is then also formed here, which, however, extends between the outer circumference of the heat exchanger tube and the inner circumference of the connecting tube.
- the connecting pipes can be positioned both above the heat shield and below the heat shield, each in relation to the position of the burner.
- the heat shield according to the invention can be used not only in kitchen stoves, but also in general in the burner chambers of boilers or, for example, in gas-heated hotplates.
- FIG. 4 shows a burner chamber 10 with side walls 12 and a cover 14, in which gas burners 16 (here indicated by a horizontal line) are arranged.
- gas burners 16 here indicated by a horizontal line
- the open ends of heat exchanger tubes open into the burner chamber 10.
- the heat exchanger tubes can be extended by appropriate connecting tubes 18, as are realized here.
- a heat protection shield 20, which consists of refractory ceramic, is arranged in each case in the burner chamber.
- FIG. 1 a first embodiment of the heat protection shield 20 according to the invention is explained. Inside the burner chamber, 1, the cover 14 and the side walls 12 are shown, two heat shields 20 are hung next to each other. As can be seen in FIG. 1, the heat shields 20 are not connected to the walls 12 of the burner chamber 10, so that they can expand freely to the side when heated accordingly.
- One of the heat protection shields has five openings 22 through which the free ends of heat exchanger tubes or of connecting tubes for the heat exchanger tubes can be pushed through. In addition, the free ends can also end between the cover plate 14 and the heat protection shield 20 without passing through the openings 22 of the heat protection shields 20.
- Separating cuts 24 are made between the individual openings 22 within the heat protection shields 20. The separating cuts in this embodiment are each formed as a tangent to the circular openings. These cuts ensure that heat-related tensions within the heat shield can be reduced more easily.
- the embodiment according to FIG. 2 largely corresponds to that according to FIG. 1, but here not only individual separating cuts or separating lines are provided between the individual openings. Rather, the heat protection shields 20 are divided into individual separate plates 26, which each extend around the openings 22 and are separated from one another by dividing lines 28. 4 shows the associated cross section to the embodiment according to FIG. 2. It follows from this that the individual plates 26 each rest on flange-shaped edges 30 of the connecting pipes 18. The connecting pipes 18 are each welded to a plate 32. The transition to the heat exchanger tubes, which are not shown here, takes place in one of the examples according to FIGS. 6-9, which will be explained later.
- FIG. 5 A modification of the heat shield 20 according to the embodiment according to FIG. 4 is shown in the embodiment according to FIG. 5.
- the heat protection shield 20 was assembled on the individual plates 26, which extend in one plane, in the embodiment according to FIG. 5 the individual plates 26 are conical and thus funnel-shaped. As shown in FIG. 5, when these individual plates 26 are attached here like lampshades to the respective ends of the connecting tubes 18.
- the heat shield 20 can also serve as a cover 14 of the burner chamber 10.
- the respective heat protection shield likewise consists of individual plates 26, which here, however, have shoulders in their edge region which, as shown in FIG. 3, each overlap and thus support one another.
- FIGS. 6, 2, 4 and 5 show examples of how the heat exchanger tubes open into the burner chamber.
- the heat shield 20 simultaneously forms the cover of the burner chamber 10.
- the heat shield could also be moved into the burner chamber, as described, for example, using the exemplary embodiments according to FIGS. 1, 2, 4 and 5.
- a connecting tube 18 is attached to the plate 26 of the heat protection shield 20.
- This connecting pipe 18 is aligned coaxially with a heat exchanger pipe 32, the free end of which is approximately at the bottom 34 of the furnace chamber.
- the opening of the furnace chamber floor 34 receiving the heat exchanger tube 32 is bent over at the edge, as is shown in more detail in FIG. 6a).
- the connecting pipe 18 is inserted into the heat exchanger pipe 32, the outer diameter of the connecting pipe 18 corresponding approximately to the inner diameter of the heat exchanger pipe 32.
- the respective diameters of the tubes 18 and 32 are matched to one another such that the connecting tube 18 is located within the heat exchanger tube 32, for example in the case of thermal expansion.
- the connecting pipe has the same diameter as the heat exchanger pipe 32.
- a gap is left between the two coaxially arranged pipe sections. This is bridged by a sleeve pipe 36 which is welded to the bent edge of the furnace floor 34.
- the connecting pipe 18 has a smaller diameter than the heat exchanger pipe 32.
- the diameter of the connecting tube 18, which projects into the open end of the heat exchanger tube 32 is dimensioned here so small that an annular gap remains between the outer diameter of the connecting tube 18 and the heat exchanger tube 32.
- FIG. 8 largely corresponds to that according to FIG. 6b).
- a sleeve pipe 36 is also arranged here.
- the diameter of the connecting pipe 18 is chosen larger than the outer diameter of the heat exchanger pipe 32 or the sleeve pipe 36 surrounding it at the end. The difference in diameter is chosen such that an annular gap remains between the outer diameter of the sleeve pipe 36 and the inner diameter of the connecting pipe 18 , as shown in Fig. 8.
- the heat protection shield is formed from two superimposed shields which correspond, for example, to the embodiment according to FIG. 1.
- the connecting pipes 18 form an integral structural unit with the heat protection shield 20.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
- Details Of Fluid Heaters (AREA)
Abstract
Description
Die Erfindung betrifft ein Hitzeschutzschild für Wärmetauscher mit zumindest einer Brennerkammer, in die die offenen Enden von Wärmetauscherrohren einmünden, wobei in dem Hitzeschutzschild Öffnungen an den Stellen vorgesehen sind, an denen die Wärmetauscherrohre in die Brennerkammer einmünden.The invention relates to a heat shield for heat exchangers with at least one burner chamber into which the open ends of heat exchanger tubes open, openings being provided in the heat shield at the points at which the heat exchanger tubes open into the burner chamber.
Ein derartiges Hitzeschutzschild wird beispielsweise in einer Brennerkammer eines gasbeheizten Küchenherdes eingesetzt. Der Aufbau eines derartigen Küchenherdes ist beispielsweise in der EP-A-551 807 beschrieben. Der dort beschriebene Küchenherd weist einen Ofenraum auf, den Wärmetauscherrohre durchziehen. Diese Wärmetauscherrohr münden mit ihren offenen Enden in eine unterhalb des Ofenraumes angeordnete Brennerkammer ein. In der Brennerkammer sind Gasbrenner angeordnet, deren heiße Verbrennungsgase durch die Wärmetauscherrohre geleitet werden.Such a heat shield is used, for example, in a burner chamber of a gas-fired kitchen range. The structure of such a range is described, for example, in EP-A-551 807. The kitchen stove described there has an oven space through which the heat exchanger tubes pass. The open ends of these heat exchanger tubes open into a burner chamber arranged below the furnace chamber. Gas burners are arranged in the burner chamber, the hot combustion gases of which are passed through the heat exchanger tubes.
In Küchenherden älterer Bauart werden die Wärmetauscherrohre mit ihren freien Enden unmittelbar mit der Abdeckplatte der Brennerkammer verschweißt. An den Schweißstellen kommt es aber durch die thermische Wechselbelastung zu hohen Spannungen, die häufig zur Beschädigung durch Deformierung oder Rißbildung führen. Um hier Abhilfe zu schaffen, wird in der EP-A-551 807 vorgeschlagen, daß zwischen der Brennerkammer und dem Ofenraum mehrere Zwischenräume gebildet werden, von denen einer mit wärmeisolierendem Material ausgefüllt ist. In dem zweiten Zwischenraum enden Anschlußstutzen, die in die offenen Enden der Wärmetauscherrohre verschiebbar eingesteckt sind.In older type cookers, the free ends of the heat exchanger tubes are directly connected to the cover plate of the burner chamber welded. At the welds, however, the thermal alternating stress leads to high stresses, which often lead to damage due to deformation or cracking. In order to remedy this, EP-A-551 807 proposes that a plurality of interspaces be formed between the burner chamber and the furnace space, one of which is filled with heat-insulating material. In the second space end connecting pieces which are slidably inserted into the open ends of the heat exchanger tubes.
Es ist auch bereits bekannt, separate Hitzeschutzschilde im oberen Bereich der Brennerkammer oder zwischen der Brennerkammer und dem Ofenraum anzuordnen.It is also known to arrange separate heat shields in the upper area of the burner chamber or between the burner chamber and the furnace chamber.
Aufgabe der vorliegenden Erfindung ist es, Hitzeschutzschilde für Wärmetauscher der eingangs angegebenen Gattung an die Hand zu geben, in denen wärmebedingte Spannungen weitgehend abgebaut werden können.The object of the present invention is to provide heat protection shields for heat exchangers of the type specified at the outset, in which heat-related tensions can largely be reduced.
Erfindungsgemäß wird diese Aufgabe bei einem gattungsgemäßen Hitzeschutzschild durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst. Demnach steht das Hitzeschutzschild nicht mit den Wandungen der Brennerkammer in Verbindung und es sind innerhalb des Hitzeschutzschildes Trennschnitte oder Trennlinien vorgesehen, die die Bereiche um die jeweiligen Öffnungen zumindest teilweise voneinander trennen. Hierdurch werden wärmebedingte Spannungen in den unmittelbar von den Brennerflammen der beaufschlagten Hitzeschutzschilden leichter abgebaut.According to the invention, this object is achieved in the case of a generic heat shield by the features of the characterizing part of claim 1. Accordingly, the heat shield is not connected to the walls of the burner chamber and there are separating cuts or dividing lines within the heat shield that at least partially separate the areas around the respective openings. As a result, heat-related stresses in the heat protection shields directly affected by the burner flames are more easily reduced.
Bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den Ansprüche 2 bis 15.Preferred embodiments of the invention result from claims 2 to 15.
Gemäß einer bevorzugten Ausgestaltung der Erfindung können im Hitzeschutzschild zwischen den einzelnen Öffnungen Trennschnitte derart vorgesehen sein, daß die wärmebedingten Deformationen des Hitzeschutzschildes aufgehoben oder reduziert werden.According to a preferred embodiment of the invention, separating cuts can be provided in the heat shield between the individual openings in such a way that the heat-related deformations of the heat shield are eliminated or reduced.
Die Trennschnitte können um die jeweilige gesamte Öffnung verlaufen, so daß die die Öffnung umgebenden Bereiche des Hitzeschutzschildes sparate Platten bilden.The separating cuts can run around the respective entire opening, so that the regions of the heat protection shield surrounding the opening form separate plates.
Diese separaten Platten können in ihrem Randbereich derart geformt sein, daß sie sich in montierter Form überlappen. Dabei bilden die entsprechenden Randbereiche jeweils derart Absätze, daß entsprechend überlappende Randbereiche der folgenden Platte auf diesen aufliegen können.The edge of these separate plates can be shaped such that they overlap when assembled. The corresponding edge areas each form shoulders such that correspondingly overlapping edge areas of the following plate can rest on them.
Die nicht miteinander verbundenen Platten des Hitzeschutzschildes können gemäß einer bevorzugten Ausgestaltung der Erfindung getrennt voneinander aufgehängt sein. Dabei können die einzelnen Platten im montierten Zustand eine Ebene bilden. Die einzelnen Platten können an den jeweiligen Wärmetauscherrohren, zu denen ihre Öffnungen gehören, aufgehängt sein. Gemäß einer bevorzugten Ausgestaltung sind die einzelnen Platten, die an den jeweiligen Wärmetauscherrohren aufgehängt sind, konisch geformt, so daß sie einem Lampenschirm gleich in die Brennerkammer hineinragen.According to a preferred embodiment of the invention, the plates of the heat protection shield which are not connected to one another can be suspended separately from one another. The individual panels can form one level when assembled. The individual plates can be suspended from the respective heat exchanger tubes to which their openings belong. According to a preferred embodiment, the individual plates, which are suspended from the respective heat exchanger tubes, are conically shaped, so that they protrude like a lampshade into the burner chamber.
Gemäß einer weiteren besonderen Ausgestaltung der Erfindung kann das Hitzeschutzschild aus zwei aufeinanderliegenden Schilden bestehen, die aber für sich die erfindungsgemäßen Merkmale aufweisen. Das Hitzeschutzschild besteht vorteilhaft aus feuerfestem Werkstoff, wie beispielsweise feuerfester Keramik.According to a further special embodiment of the invention, the heat protection shield can consist of two shields lying one on top of the other, but which have the features according to the invention as such. The heat protection shield advantageously consists of refractory material, such as refractory ceramic.
Gemäß einer weiteren Ausgestaltung der Erfindung können am Rand der im Hitzeschutzschild angeordneten Öffnungen Anschlußrohre angesetzt sein. Diese Anschlußrohre sind im montierten Zustand grundsätzlich koaxial zu den jeweiligen Wärmetauscherrohren ausgerichtet. Dabei kann der Anschluß an die jeweiligen Wärmetauscherrohre auf unterschiedliche Art und Weise erfolgen.According to a further embodiment of the invention, connecting pipes can be attached to the edge of the openings arranged in the heat shield. In the assembled state, these connecting pipes are basically aligned coaxially with the respective heat exchanger pipes. The connection to the respective heat exchanger tubes can be made in different ways.
Zum einen kann das Anschlußrohr in montierter Stellung jeweils in das zugehörige Wärmetauscherrohr eingeschoben sein, wobei das Anschlußrohr mit seiner Außenwandung zwar an der Innenwandung des Wärmetauscherrohres anliegt, wobei jedoch seine Längsverschieblichkeit im Wärmetauscherrohr gewährleistet bleibt.On the one hand, the connecting tube can be inserted into the associated heat exchanger tube in the assembled position, the Connection tube with its outer wall rests against the inner wall of the heat exchanger tube, but its longitudinal displaceability in the heat exchanger tube remains guaranteed.
Das Anschlußrohr und das Ende des zugehörigen Wärmetauscherrohres können auch den gleichen Durchmesser aufweisen und getrennt voneinander angeordnet sein, wobei beide durch ein entsprechendes Muffenrohr umgeben sind, das somit die Verbindung zwischen den beiden Rohren bildet. Dabei kann entweder das Anschlußrohr oder das Ende des zugehörigen Wärmetauscherrohres oder es können auch beide im Muffenrohr längsverschieblich gelagert sein.The connecting pipe and the end of the associated heat exchanger pipe can also have the same diameter and be arranged separately from one another, both of which are surrounded by a corresponding sleeve pipe, which thus forms the connection between the two pipes. Either the connecting pipe or the end of the associated heat exchanger pipe or both can also be mounted in a longitudinally displaceable manner in the sleeve pipe.
Gemäß einer alternativen Ausführungsform kann das Anschlußrohr im montierten Zustand in dem jeweils zugeordneten Wärmetauscherrohr unter Bildung eines Ringspaltes zwischen der Außenfläche des Anschlußrohres und der Innenfläche des Wärmetauscherrohres liegen.According to an alternative embodiment, the connecting pipe can lie in the assembled state in the respectively assigned heat exchanger pipe, forming an annular gap between the outer surface of the connecting pipe and the inner surface of the heat exchanger pipe.
Eine weitere alternative Ausführungsform kann darin bestehen, daß das Anschlußrohr einen größeren Durchmesser als das Wärmetauscherrohr aufweist und damit außerhalb des Endes des jeweils zugeordneten Wärmetauscherrohres liegt. Auch hier wird dann ein Ringspalt gebildet, der sich allerdings zwischen dem Außenumfang des Wärmetauscherrohres und dem Innenumfang des Anschlußrohres erstreckt.A further alternative embodiment can consist in that the connecting pipe has a larger diameter than the heat exchanger pipe and is therefore outside the end of the respectively assigned heat exchanger pipe. An annular gap is then also formed here, which, however, extends between the outer circumference of the heat exchanger tube and the inner circumference of the connecting tube.
Grundsätzlich können die Anschlußrohre sowohl oberhalb des Hitzeschutzschildes wie auch unterhalb des Hitzeschutzschildes, jeweils in bezug auf die Position des Brenners, ansetzen.In principle, the connecting pipes can be positioned both above the heat shield and below the heat shield, each in relation to the position of the burner.
Das erfindungsgemäße Hitzeschutzschild kann nicht nur in Küchenherden, sondern auch allgemein in Brennerkammern von Boilern oder beispielsweise bei gasbeheizten Kochplatten Anwendung finden.The heat shield according to the invention can be used not only in kitchen stoves, but also in general in the burner chambers of boilers or, for example, in gas-heated hotplates.
Weitere Einzelheiten und Vorteile der Erfindung werden anhand von den in den folgenden Figuren dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:
- Fig. 1:
- eine schematische Draufsicht von unten auf die Abdeckplatte einer Brennerkammer mit eingebauten Hitzeschutzschilden gemäß einer ersten Ausführungsform der Erfindung,
- Fig. 2:
- eine Darstellung gemäß Fig. 1 mit Hitzeschutzschilden einer zweiten Ausführungsform gemäß der vorliegenden Erfindung,
- Fig. 3:
- einen Querschnitt einer weiteren Ausführungsform eines erfindungsgemäßen Hitzeschutzschildes,
- Fig. 4 u. 5:
- Querschnitte von weiteren erfindungsgemäßen Ausführungsformen von Hitzeschutzschilden und
- Fig. 6a), 6b) bis 9:
- Querschnitte von erfindungsgemäßen Hitzeschutzschilden, bei denen jeweils Anschlußrohre zum Übergang in die Wärmetauscherrohre in verschiedenen Ausführungsformen vorgesehen sind.
- Fig. 1:
- 2 shows a schematic plan view from below of the cover plate of a burner chamber with built-in heat protection shields according to a first embodiment of the invention,
- Fig. 2:
- 1 with heat protection shields of a second embodiment according to the present invention,
- Fig. 3:
- 3 shows a cross section of a further embodiment of a heat protection shield according to the invention,
- Fig. 4 u. 5:
- Cross sections of further embodiments of heat protection shields and
- 6a), 6b) to 9:
- Cross sections of heat protection shields according to the invention, in which connection pipes are provided in different embodiments for the transition into the heat exchanger pipes.
In der Fig. 4 ist eine Brennerkammer 10 mit Seitenwänden 12 und einer Abdeckung 14 dargestellt, in der Gasbrenner 16 (hier durch eine waagerechte Linie angedeutet) angeordnet sind. In die Brennerkammer 10 münden die offenen Enden von Wärmetauscherrohren ein. Dabei können die Wärmetauscherrohre durch entsprechende Anschlußrohre 18, wie sie hier verwirklicht sind, verlängert sein. In der Brennerkammer ist jeweils ein Hitzeschutzschild 20 angeordnet, das aus feuerfester Keramik besteht.FIG. 4 shows a
Anhand der Fig. 1 wird eine erste Ausführungsform des erfindungsgemäßen Hitzeschutzschildes 20 erläutert. Innerhalb der Brennerkammer, von der in Fig. 1 die Abdeckung 14 und die Seitenwände 12 dargestellt sind, sind nebeneinander zwei Hitzeschutzschilde 20 aufgehängt. Wie der Fig. 1 zu entnehmen ist, stehen die Hitzeschutzschilde 20 nicht mit den Wandungen 12 der Brennerkammer 10 in Verbindung, so daß diese sich bei entsprechendem Erhitzen frei zur Seite hin ausdehnen können. Eines der Hitzeschutzschilde weist fünf Öffnungen 22 auf, durch die die freien Enden von Wärmetauscherrohren bzw. von Anschlußrohren für die Wärmetauscherrohre durchsteckbar sind. Zusätzlich können die freien Enden aber auch zwischen der Abdeckplatte 14 und dem Hitzeschutzschild 20 enden, ohne durch die Öffnungen 22 der Hitzeschutzschilde 20 hindurchzutreten. Zwischen den einzelnen Öffnungen 22 innerhalb der Hitzeschutzschilde 20 sind Trennschnitte 24 ausgeführt. Dabei sind die Trennschnitte in diesem Ausführungsbeispiel jeweils als Tangente an die kreisförmigen Öffnungen ausgebildet. Durch diese Einschnitte ist es gewährleistet, daß sich wärmebedingte Spannungen innerhalb des Hitzeschutzschildes leichter abbauen können.1, a first embodiment of the
Die Ausführungsform gemäß Fig. 2 entspricht weitestgehend derjenigen gemäß Fig. 1, wobei hier aber nicht nur einzelne Trennschnitte oder Trennlinien zwischen den einzelnen Öffnungen vorgesehen sind. Hier sind vielmehr die Hitzeschutzschilde 20 in einzelne separate Platten 26 aufgeteilt, die sich jeweils um die Öffnungen 22 herum erstrecken und voneinander durch Trennlinien 28 getrennt sind. In der Fig. 4 ist der zugehörigen Querschnitt zu der Ausführungsform gemäß Fig. 2 gezeigt. Hieraus ergibt sich, daß die einzelnen Platten 26 jeweils auf flanschförmigen Rändern 30 der Anschlußrohre 18 aufliegen. Die Anschlußrohre 18 sind jeweils an einer Platte 32 angeschweißt. Der Übergang zu den Wärmetauscherrohren, die hier nicht dargestellt sind, erfolgt in einem der Beispiele gemäß der Fig. 6-9, die später erläutert werden.The embodiment according to FIG. 2 largely corresponds to that according to FIG. 1, but here not only individual separating cuts or separating lines are provided between the individual openings. Rather, the heat protection shields 20 are divided into individual
Eine Abwandlung des Hitzeschutzschildes 20 gemäß der Ausführungsform nach Fig. 4 ist in der Ausführungsform gemäß Fig. 5 dargestellt. Während in Fig. 4 das Hitzeschutzschild 20 auf den einzelnen Platten 26 zusammengesetzt war, die sich in einer Ebene erstrecken, sind in der Ausführungsform gemäß Fig. 5 die einzelnen Platten 26 konisch und damit trichterförmig ausgebildet. Wie in der Fig. 5 dargestellt ist, wenn diese einzelnen Platten 26 hier wie Lampenschirme an den jeweiligen Enden der Anschlußrohre 18 angesetzt.A modification of the
Gemäß der Ausführungsform nach Fig. 3 kann das Hitzeschutzschild 20 auch gleichzeitig als Abdeckung 14 der Brennerkammer 10 dienen. In dieser Ausführungsform besteht das jeweilige Hitzeschutzschild ebenfalls aus einzelnen Platten 26, die hier jedoch in ihrem Randbereich Absätze aufweisen, die sich, wie in Fig. 3 dargestellt, jeweils überlappen und damit gegenseitig abstützen.According to the embodiment of FIG. 3, the
In den Fig. 6a bis 9 ist anhand von Beispielen dargestellt, wie die Wärmetauscherrohre in die Brennerkammer einmünden. In den dort dargestellten Ausführungsbeispielen bildet das Hitzeschutzschild 20 gleichzeitig die Abdeckung der Brennerkammer 10. In gleicher Weise könnte aber auch das Hitzeschutzschild in die Brennerkammer hineinverlegt werden, wie das beispielsweise anhand der Ausführungsbeispiele nach den Fig. 1, 2, 4 und 5 beschrieben ist.6a to 9 show examples of how the heat exchanger tubes open into the burner chamber. In the exemplary embodiments shown there, the
Im Ausführungsbeispiel gemäß der Fig. 6a) ist ein Anschlußrohr 18 an der Platte 26 des Hitzeschutzschildes 20 angesetzt. Dieses Anschlußrohr 18 ist koaxial zu einem Wärmetauscherrohr 32 ausgerichtet, das mit seinem freien Ende ungefähr mit dem Boden 34 des Ofenraumes abschließt. Die das Wärmetauscherrohr 32 aufnehmende Öffnung des Ofenraumbodens 34 ist randseitig umgebogen, wie das in der Fig. 6a) näher dargestellt ist. Das Anschlußrohr 18 ist in das Wärmetauscherrohr 32 eingeschoben, wobei der Außendurchmesser des Anschlußrohres 18 ungefähr dem Innendurchmesser des Wärmetauscherrohres 32 entspricht. Dabei sind die jeweiligen Durchmesser der Rohre 18 und 32 aber so aufeinander abgestimmt, daß sich das Anschlußrohr 18 innerhalb des Wärmetauscherrohres 32, beispielsweise bei wärmebedingter Ausdehnung, ausdehnen kann.In the exemplary embodiment according to FIG. 6 a), a connecting
In der Auführungsform gemäß 6b), die weitgehend derjenigen gemäß Fig. 6a) entspricht, weist das Anschlußrohr den gleichen Durchmesser wie das Wärmetauscherrohr 32 auf. Zwischen den beiden koaxial angeordneten Rohrstücken ist ein Spalt gelassen. Dieser wird von einem Muffenrohr 36 das an dem umgebogenen Rand des Ofenraumbodens 34 angeschweißt ist, überbrückt.In the embodiment according to 6b), which largely corresponds to that according to FIG. 6a), the connecting pipe has the same diameter as the
Die Ausführungsform gemäß Fig. 7 entspricht weitgehend derjenigen gemäß Fig. 6a). Auch hier weist das Anschlußrohr 18 einen kleineren Durchmesser als das Wärmetauscherrohr 32 auf. Allerdings ist der Durchmesser des Anschlußrohres 18, das in das offene Ende des Wärmetauscherrohres 32 hineinragt, hier so klein bemessen, daß zwischen dem Außendurchmesser des Anschlußrohres 18 und dem Wärmetauscherrohr 32 ein Ringspalt verbleibt.The embodiment according to FIG. 7 largely corresponds to that according to FIG. 6a). Here too, the connecting
Die Ausführungsform gemäß Fig. 8 entspricht weitgehend derjenigen gemäß der Fig. 6b). Auch hier ist ein Muffenrohr 36 angeordnet. Allerdings ist hier der Durchmesser des Anschlußrohres 18 größer gewählt als der Außendurchmesser des Wärmetauscherrohres 32 bzw. der dieses endseitig umgebenden Muffenrohres 36. Dabei ist der Durchmesserunterschied so gewählt, daß auch hier ein Ringspalt zwischen dem Außendurchmesser des Muffenrohres 36 und dem Innendurchmesser des Anschlußrohres 18 verbleiben, wie dies in Fig. 8 dargestellt ist.The embodiment according to FIG. 8 largely corresponds to that according to FIG. 6b). A
Die Ausführungsform gemäß Fig. 9 entspricht weitgehend derjenigen gemäß Fig. 8. Hier ist allerdings das Hitzeschutzschild aus zwei aufeinanderliegenden Schilden gebildet, die beispielsweise der Ausführungsform gemäß Fig. 1 entsprechen. In dieser Ausführungsform bilden die Anschlußrohre 18 mit dem Hitzeschutzschild 20 ein integrale Baueinheit.The embodiment according to FIG. 9 largely corresponds to that according to FIG. 8. Here, however, the heat protection shield is formed from two superimposed shields which correspond, for example, to the embodiment according to FIG. 1. In this embodiment, the connecting
Claims (15)
dadurch gekennzeichnet,
daß das Hitzeschutzschild nicht mit den Wandungen der Brennerkammer in Verbindung steht und daß innerhalb des Hitzeschutzschildes Trennschnitte oder Trennlinien vorgesehen sind, die die Bereiche um die jeweiligen Öffnungen zumindest teilweise voneinander trennen.Heat protection shield for heat exchangers with at least one burner chamber into which the open ends of heat exchanger tubes open, wherein openings are provided in the heat protection shield at the points at which the heat exchanger tubes open into the combustion chamber,
characterized by
that the heat shield is not connected to the walls of the burner chamber and that separating cuts or lines are provided within the heat shield that at least partially separate the areas around the respective openings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9416203U DE9416203U1 (en) | 1994-10-07 | 1994-10-07 | Heat shield for heat exchangers |
| DE9416203U | 1994-10-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0706014A1 true EP0706014A1 (en) | 1996-04-10 |
| EP0706014B1 EP0706014B1 (en) | 1999-10-20 |
Family
ID=6914635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95111715A Expired - Lifetime EP0706014B1 (en) | 1994-10-07 | 1995-07-25 | Heat protection shield for heat exchanger |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0706014B1 (en) |
| AT (1) | ATE185890T1 (en) |
| DE (2) | DE9416203U1 (en) |
| DK (1) | DK0706014T3 (en) |
| ES (1) | ES2138689T3 (en) |
| GR (1) | GR3032448T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9372005B2 (en) | 2012-11-30 | 2016-06-21 | Alto-Shaam, Inc. | Heat exchanger for oven |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3707186A (en) * | 1971-01-18 | 1972-12-26 | Foster Wheeler Corp | Cooling tube ferrule |
| DD239465A1 (en) * | 1985-07-18 | 1986-09-24 | Kali Veb K | APPARATUS FOR WEAR REDUCTION SUSPENSION THREUST-STREAMED PIPE BELT WELDING EXCHANGER |
| FR2661244A1 (en) * | 1990-04-19 | 1991-10-25 | Olifan Vibracim Sa | Protective end-piece for boiler tube and its method of manufacture |
| EP0551807A1 (en) | 1992-01-08 | 1993-07-21 | Lainox S.R.L. | Forced convection ovens for cooking food. |
| EP0567674A1 (en) * | 1992-04-29 | 1993-11-03 | Deutsche Babcock-Borsig Aktiengesellschaft | Heat exchange for cooling synthesis gas produced in a coal gasification plant |
| EP0599103A1 (en) * | 1992-11-26 | 1994-06-01 | Wiesheu-Wiwa GmbH | Heat exchanger with heating by flame |
-
1994
- 1994-10-07 DE DE9416203U patent/DE9416203U1/en not_active Expired - Lifetime
-
1995
- 1995-07-25 DE DE59507088T patent/DE59507088D1/en not_active Expired - Fee Related
- 1995-07-25 EP EP95111715A patent/EP0706014B1/en not_active Expired - Lifetime
- 1995-07-25 ES ES95111715T patent/ES2138689T3/en not_active Expired - Lifetime
- 1995-07-25 DK DK95111715T patent/DK0706014T3/en active
- 1995-07-25 AT AT95111715T patent/ATE185890T1/en not_active IP Right Cessation
-
2000
- 2000-01-20 GR GR20000400143T patent/GR3032448T3/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3707186A (en) * | 1971-01-18 | 1972-12-26 | Foster Wheeler Corp | Cooling tube ferrule |
| DD239465A1 (en) * | 1985-07-18 | 1986-09-24 | Kali Veb K | APPARATUS FOR WEAR REDUCTION SUSPENSION THREUST-STREAMED PIPE BELT WELDING EXCHANGER |
| FR2661244A1 (en) * | 1990-04-19 | 1991-10-25 | Olifan Vibracim Sa | Protective end-piece for boiler tube and its method of manufacture |
| EP0551807A1 (en) | 1992-01-08 | 1993-07-21 | Lainox S.R.L. | Forced convection ovens for cooking food. |
| EP0567674A1 (en) * | 1992-04-29 | 1993-11-03 | Deutsche Babcock-Borsig Aktiengesellschaft | Heat exchange for cooling synthesis gas produced in a coal gasification plant |
| EP0599103A1 (en) * | 1992-11-26 | 1994-06-01 | Wiesheu-Wiwa GmbH | Heat exchanger with heating by flame |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9372005B2 (en) | 2012-11-30 | 2016-06-21 | Alto-Shaam, Inc. | Heat exchanger for oven |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE185890T1 (en) | 1999-11-15 |
| DE59507088D1 (en) | 1999-11-25 |
| GR3032448T3 (en) | 2000-05-31 |
| EP0706014B1 (en) | 1999-10-20 |
| ES2138689T3 (en) | 2000-01-16 |
| DK0706014T3 (en) | 2000-01-03 |
| DE9416203U1 (en) | 1994-12-01 |
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