EP2058591B1 - Vaporiser component, in particular for a vaporizing burner of a vehicle heater and method for its production - Google Patents

Vaporiser component, in particular for a vaporizing burner of a vehicle heater and method for its production Download PDF

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Publication number
EP2058591B1
EP2058591B1 EP08017226.5A EP08017226A EP2058591B1 EP 2058591 B1 EP2058591 B1 EP 2058591B1 EP 08017226 A EP08017226 A EP 08017226A EP 2058591 B1 EP2058591 B1 EP 2058591B1
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EP
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Prior art keywords
evaporator medium
evaporator
medium carrier
heating
porous
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EP08017226.5A
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German (de)
French (fr)
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EP2058591A3 (en
EP2058591A2 (en
Inventor
Günter Eberspach
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Eberspaecher Climate Control Systems GmbH and Co KG
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Eberspaecher Climate Control Systems GmbH and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D3/00—Burners using capillary action
    • F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies

Definitions

  • the present invention relates to a method for producing an evaporator assembly, as it can be used for example in an evaporator burner of a vehicle heater.
  • evaporator assemblies are generally constructed with an example pot-like evaporator medium carrier, which carries on its side facing a combustion chamber, a porous evaporator medium. Liquid fuel is fed into this porous evaporator medium via a fuel feed line. The liquid fuel is distributed in the inner volume region of the evaporator medium by Kapillartone Angel and possibly also by gravity and thus reaches the side facing the combustion chamber side of the evaporator medium. There, the fuel evaporates into the combustion chamber and forms together with the air introduced into this a combustible mixture.
  • the evaporator medium carrier Heating device provided for example with a heating element.
  • the heating element is energized in the starting phase and thus heats the porous evaporator medium and the liquid fuel contained therein.
  • the construction is generally such that the heating conductor is located on a side of the evaporator medium carrier facing away from the evaporator medium.
  • the heat generated in the heating element is passed through the evaporator medium carrier and thus introduced into the evaporator medium comparatively uniformly, that is, substantially distributed over the entire contact surface between the porous evaporator medium and the evaporator medium carrier.
  • an evaporator assembly for an evaporator burner is known in which the electrically energizable heater or a heating conductor thereof is located on the side facing the porous evaporator medium side of the evaporator medium carrier between this and the porous evaporator medium. While in this embodiment thermal losses are substantially eliminated by the direct contact between the heating conductor and the porous evaporator medium, there is a problem in that, on the one hand, heat transfer into the porous evaporator medium takes place only where it is in direct contact with the heating conductor. Other areas not contacted by the heating conductor are heated only by heat conduction within the porous evaporator medium itself.
  • an evaporator assembly in which at the back of a made of sheet material, pot-like evaporator medium carrier, a heating conductor of a heater is arranged.
  • the EP 1 484 552 A1 discloses an evaporator assembly in which on the side facing away from a combustion chamber side of a bottom wall of a combustion chamber with intermediate storage of a thermally insulating, plate-like intermediate member, a heat conducting element is provided which engages with an ignition region through the bottom wall of the combustion chamber housing in the region of the porous evaporator medium. At the back of this element, a recess arrangement is provided, in which the heating element of a heating device is embedded.
  • the EP 1 574 782 A1 discloses an evaporator burner with a pot-shaped combustion chamber housing. At a bottom region of this combustion chamber housing porous evaporator medium is carried with the interim storage of a heater.
  • the heating device comprises radially staggered, electrically energizable heating elements which are embedded in good thermal conductive material.
  • this object is achieved by a method according to claim 1 for producing an evaporator assembly, in particular for an evaporator burner of a vehicle heater, the evaporator assembly comprising an evaporator medium carrier, a porous evaporator medium and a heater, wherein the heater is at least partially embedded in the building material of the evaporator medium carrier.
  • the evaporator medium carrier is produced by sintering, which facilitates the embedding of the heating device, namely in that the heating device is embedded in the unsintered build material of the evaporator medium carrier and then the evaporator medium carrier is sintered.
  • the heating device is thus at least partially embedded in the building material of the evaporator medium carrier, the heater moves closer to this without having direct contact with the evaporator medium. This means that a lower thermal resistance must be overcome, however, however, a substantially achievable over the entire contact surface heating leads to a corresponding uniform fuel evaporation from the porous evaporator medium.
  • the heating device comprises a heating conductor in contact with the evaporator medium carrier, efficient heating can be achieved with an easily realized structure.
  • the efficiency of the heating can be kept very high, that the heating element is completely embedded in the building material of the evaporator medium carrier. It is ensured in this way that the entire heat emitted by the heating element can be introduced and transferred at least into the evaporator medium carrier.
  • the heating element is not completely embedded in the building material of the evaporator medium carrier. In this way, even with a comparatively thin-walled evaporator medium carrier, it can be ensured that sufficient build-up material of the evaporator medium carrier is still present between the heating conductor and the porous evaporator medium, which homogenization of the heat input into the porous evaporator medium.
  • the present invention relates to a vehicle heater having an evaporator assembly made by the method of the present invention.
  • the Fig. 1 shows a sectional view of an evaporator assembly 10 for a vehicle heater.
  • This evaporator assembly 10 comprises a pot-shaped evaporator medium carrier 12 having a bottom wall 14 and a peripheral wall 16.
  • This evaporator medium carrier 12 can be provided in a combustion chamber housing or limit a combustion chamber together with a circumferential wall of such a combustion chamber assembly as a bottom assembly.
  • the evaporator medium carrier 12 carries a porous evaporator medium 18.
  • This porous evaporator medium 18 constructed for example of metal mesh, network, knitted fabric or ceramic foam receives the liquid fuel via a fuel supply line, not shown, and distributes this liquid fuel in its internal volume range by the capillary action of the pore structure.
  • the fuel exits in vapor form from the porous evaporator medium.
  • the porous evaporator medium 18 abuts against a surface 24 of the evaporator medium carrier 12.
  • a heating element 26 of a generally designated 28 heater is embedded in the bottom wall 14 of the evaporator medium carrier 12.
  • the heating conductor 26 may, for example, be spirally, helically or meander-like embedded in the building material of the evaporator medium carrier 12.
  • Fig. 1 One recognizes in Fig. 1 in that in the thickness direction of the bottom wall 14 the heating conductor 26 is arranged approximately centrally in the region of the bottom wall 14.
  • the complete embedding By embedding the heating element 26, in the embodiment of the Fig. 1 the complete embedding, a very efficient heat transfer of the thermal energy provided by the heating conductor 26 on the Evaporator medium carrier 12 or at the surface 24 adjacent porous evaporator medium 18 reaches. Since there is still sufficient build-up material of the evaporator medium carrier 12 between the heating conductor 26 and the side 22 of the porous evaporator medium 18, a very uniform heat flow is introduced into the porous evaporator medium 18 by heat conduction and heat distribution in the evaporator medium carrier 12. Local overheating is avoided. At the same time, the complete embedding of the heating element 26 has the advantage that the proportion of heat energy conducted in the direction of the porous evaporator medium 18 can be kept very low.
  • evaporator assembly 10 is performed so that the evaporator medium carrier 12 is sintered.
  • the heating conductor 26 can be embedded in the building material initially present in powder form, namely at the positioning provided for this purpose.
  • the evaporator medium carrier 12 is then sintered and thus a solid bond between this and the embedded heating element 26 is produced.
  • the porous evaporator medium 18 may be fixed to the evaporator medium carrier 12 in various ways. For example, after the preparation of the evaporator medium carrier 12, a film of soldering material may be applied to the surface 24, which is melted and then realizes a bond between the porous evaporator medium 18 resting on this film of soldering material and the evaporator medium carrier 12. It is also possible to sinter the porous evaporator medium 18 into the evaporator medium carrier 12. Here, for example, an already prefabricated body of the porous evaporator medium 18 can be used and a solid bond can be realized by producing a sintered layer in the adjoining region of the evaporator medium 18 and the evaporator medium carrier 12.
  • porous evaporator medium 18 it is also conceivable for the porous evaporator medium 18 to be sintered into the evaporator medium carrier 12 in that the build-up material for the porous evaporator medium 18 is initially powdered. or particle-like form is applied to the evaporator medium carrier 12 and then by pressure and temperature exercise, the porous, solid structure of the porous evaporator medium 18 is generated.
  • FIG Fig. 2 An alternative embodiment of the evaporator assembly 10 is shown in FIG Fig. 2 shown.
  • components or assemblies which correspond to components already described above with regard to construction and function are designated by the same reference number with the addition of the appendix "a".
  • heating conductor 26a of the heating device 28a is not completely embedded in the bottom wall 14a of the evaporator medium carrier 12a.
  • a partial region of the surface of the heating conductor 26a which is formed, for example, with a circular cross-section, projects out of the bottom wall 14a via the rear side 30a facing away from the porous evaporator medium 18a.
  • This embodiment variant can also be produced by, during the production of the evaporator medium carrier 12a, embedding the heating conductor 26a in the, for example, still particulate build-up material of the evaporator medium carrier 12a, namely partially embedded, whereupon the sintering process is carried out.
  • Fig. 2 illustrated embodiment is particularly useful when the bottom wall 14a is comparatively thin and then would completely approach embedding the heating element 26a in this bottom wall 14a, the heating element 26a would approach very close to the surface 24a. This could again lead to the problem of too localized thermal interaction of the heating conductor 26a with the porous evaporator medium 18a. Characterized in that the heating conductor 26a at the in Fig.
  • the embodiment shown is held closer to the rear side 30a and partially exits therefrom, ie protrudes with a peripheral region of its outer surface on the side 30a, is between the heating conductor 26a and the Page 22a of the porous evaporator medium 18a still sufficient building material of the evaporator medium carrier 12a, which produces a homogenization of the heat flow.
  • the evaporator medium carrier As a building material of the evaporator medium carrier is particularly suitable because it is produced in a sintering process, ceramic material, as this ensures a very long service life at the occurring very high thermal loads.
  • the heating conductor can of course be implemented in various forms, and leading away from the heating conductor terminals, with which it is connected to a power supply system and which are not shown in the figures, can be guided away at the back, but can of course also on the outer peripheral portion of the bottom wall or the peripheral wall be led away from the area of the evaporator medium carrier.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Verdampferbaugruppe, wie sie beispielsweise bei einem Verdampferbrenner eines Fahrzeugheizgerätes eingesetzt werden kann. Derartige Verdampferbaugruppen sind im Allgemeinen mit einem beispielsweise topfartigen Verdampfermediumträger aufgebaut, der an seiner einer Brennkammer zugewandten Seite ein poröses Verdampfermedium trägt. In dieses poröse Verdampfermedium wird über eine Brennstoffzuführleitung flüssiger Brennstoff eingespeist. Der flüssige Brennstoff verteilt sich im Innenvolumenbereich des Verdampfermediums durch Kapillarförderwirkung und ggf. auch Schwerkrafteinwirkung und gelangt so an die der Brennkammer zugewandt liegende Seite des Verdampfermediums. Dort dampft der Brennstoff in die Brennkammer ab und bildet zusammen mit der in diese eingeleiteten Luft ein verbrennungsfähiges Gemisch. Um vor allem in der Startphase, also allgemein bei vergleichsweise niedrigen Umgebungs- und Systemtemperaturen, die Brennstoffabdampfung zu unterstützen und somit vergleichsweise schnell ein zum Starten der Verbrennung erforderliches Gemisch aus Brennstoffdampf und Luft bereitstellen zu können, ist an dem Verdampfermediumträger oftmals eine im Allgemeinen elektrisch erregbare Heizeinrichtung beispielsweise mit einem Heizleiter vorgesehen. Der Heizleiter wird in der Startphase erregt und erwärmt damit das poröse Verdampfermedium und den darin enthaltenen flüssigen Brennstoff. Der Aufbau ist im Allgemeinen derart, dass der Heizleiter an einer von dem Verdampfermedium abgewandten Seite des Verdampfermediumträgers liegt. Die im Heizleiter erzeugte Wärme wird dabei durch den Verdampfermediumträger hindurch geleitet und somit vergleichsweise gleichmäßig, also im Wesentlichen verteilt über die gesamte Kontaktfläche zwischen dem porösen Verdampfermedium und dem Verdampfermediumträger, in das Verdampfermedium eingeleitet.The present invention relates to a method for producing an evaporator assembly, as it can be used for example in an evaporator burner of a vehicle heater. Such evaporator assemblies are generally constructed with an example pot-like evaporator medium carrier, which carries on its side facing a combustion chamber, a porous evaporator medium. Liquid fuel is fed into this porous evaporator medium via a fuel feed line. The liquid fuel is distributed in the inner volume region of the evaporator medium by Kapillarförderwirkung and possibly also by gravity and thus reaches the side facing the combustion chamber side of the evaporator medium. There, the fuel evaporates into the combustion chamber and forms together with the air introduced into this a combustible mixture. To be able to support the fuel evaporation especially in the starting phase, that is generally at comparatively low ambient and system temperatures, and thus to be able to provide a mixture of fuel vapor and air that is relatively quick to start the combustion, it is often possible to electrically excite the evaporator medium carrier Heating device provided for example with a heating element. The heating element is energized in the starting phase and thus heats the porous evaporator medium and the liquid fuel contained therein. The construction is generally such that the heating conductor is located on a side of the evaporator medium carrier facing away from the evaporator medium. The heat generated in the heating element is passed through the evaporator medium carrier and thus introduced into the evaporator medium comparatively uniformly, that is, substantially distributed over the entire contact surface between the porous evaporator medium and the evaporator medium carrier.

Aus der EP 1 420 205 A2 ist eine Verdampferbaugruppe für einen Verdampferbrenner bekannt, bei welcher die elektrisch erregbare Heizeinrichtung bzw. ein Heizleiter derselben an der dem porösen Verdampfermedium zugewandten Seite des Verdampfermediumträgers zwischen diesem und dem porösen Verdampfermedium liegt. Während bei dieser Ausgestaltung durch den direkten Kontakt zwischen dem Heizleiter und dem porösen Verdampfermedium thermische Verluste im Wesentlichen eliminiert sind, besteht ein Problem darin, dass einerseits ein Wärmeübertrag in das poröse Verdampfermedium nur dort stattfindet, wo dieses in direktem Kontakt mit dem Heizleiter steht. Andere, nicht durch den Heizleiter kontaktierte Bereiche werden nur durch Wärmeleitung innerhalb des porösen Verdampfermediums selbst erwärmt. Dort, wo ein direkter Kontakt zwischen dem Heizleiter und dem porösen Verdampfermedium besteht, also dort, wo im Wesentlichen die gesamte Wärmeenergie in das poröse Verdampfermedium eingetragen werden muss, kann es zu lokalen Überhitzungen kommen, mit dem Problem, dass insbesondere bei Einsatz niedrig siedender Brennstoffe der Brennstoff an ungeeigneter Position zu sieden beginnt bzw. auch Ablagerungen erzeugt werden.From the EP 1 420 205 A2 an evaporator assembly for an evaporator burner is known in which the electrically energizable heater or a heating conductor thereof is located on the side facing the porous evaporator medium side of the evaporator medium carrier between this and the porous evaporator medium. While in this embodiment thermal losses are substantially eliminated by the direct contact between the heating conductor and the porous evaporator medium, there is a problem in that, on the one hand, heat transfer into the porous evaporator medium takes place only where it is in direct contact with the heating conductor. Other areas not contacted by the heating conductor are heated only by heat conduction within the porous evaporator medium itself. Where there is direct contact between the heating conductor and the porous evaporator medium, ie where essentially all of the heat energy has to be introduced into the porous evaporator medium, local overheating may occur, with the problem that, in particular when low-boiling fuels are used the fuel begins to boil in an inappropriate position or deposits are generated.

Aus der DE 10 2004 020 129 B3 ist eine Verdampferbaugruppe bekannt, bei welcher an der Rückseite eines aus Blechmaterial gefertigen, topfartigen Verdampfermediumträgers ein Heizleiter einer Heizeinrichtung angeordnet ist.From the DE 10 2004 020 129 B3 an evaporator assembly is known, in which at the back of a made of sheet material, pot-like evaporator medium carrier, a heating conductor of a heater is arranged.

Die EP 1 484 552 A1 offenbart eine Verdampferbaugruppe, bei welcher an der von einer Brennkammer abgewandten Seite einer Bodenwandung eines Brennkammergehäuses unter Zwischenlagerung eines thermisch isolierenden, plattenartigen Zwischenelements ein Wärmeleitelement vorgesehen ist, das mit einem Zündbereich durch die Bodenwandung des Brennkammergehäuses hindurch in den Bereich des porösen Verdampfermediums eingreift. An der Rückseite dieses Elements ist eine Vertiefungsanordnung vorgesehen, in welche der Heizleiter einer Heizeinrichtung eingebettet ist.The EP 1 484 552 A1 discloses an evaporator assembly in which on the side facing away from a combustion chamber side of a bottom wall of a combustion chamber with intermediate storage of a thermally insulating, plate-like intermediate member, a heat conducting element is provided which engages with an ignition region through the bottom wall of the combustion chamber housing in the region of the porous evaporator medium. At the back of this element, a recess arrangement is provided, in which the heating element of a heating device is embedded.

Die EP 1 574 782 A1 offenbart einen Verdampferbrenner mit einem topfartig aufgebauten Brennkammergehäuse. An einem Bodenbereich dieses Brennkammergehäuses ist unter Zwischenlagerung einer Heizeinrichtung poröses Verdampfermedium getragen. Die Heizeinrichtung umfasst radial gestaffelte, elektrisch erregbare Heizelemente, die in gut thermisch leitendes Material eingebettet sind.The EP 1 574 782 A1 discloses an evaporator burner with a pot-shaped combustion chamber housing. At a bottom region of this combustion chamber housing porous evaporator medium is carried with the interim storage of a heater. The heating device comprises radially staggered, electrically energizable heating elements which are embedded in good thermal conductive material.

Es ist die Aufgabe der vorliegenden Erfindung, ein Verfahren zur Herstellung einer Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes bereitzustellen, die eine gleichmäßige und Überhitzungen vermeidende Erwärmung des porösen Verdampfermediums ohne der Gefahr lokaler Überhitzungen sicherstellt.It is the object of the present invention to provide a method for producing an evaporator assembly, in particular for an evaporator burner of a vehicle heater, which ensures a uniform and overheating preventing heating of the porous evaporator medium without the risk of local overheating.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren gemäß Anspruch 1 zur Herstellung einer Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes, die Verdampferbaugruppe umfassend einen Verdampfermediumträger, ein poröses Verdampfermedium und eine Heizeinrichtung, wobei die Heizeinrichtung wenigstens teilweise in das Aufbaumaterial des Verdampfermediumträgers eingebettet wird. Der Verdampfermediumträger wird durch Sintern hergestellt, was das Einbetten der Heizeinrichtung erleichtert, nämlich dadurch, dass die Heizeinrichtung in das ungesinterte Aufbaumaterial des Verdampfermediumträgers eingebettet wird und anschließend der Verdampfermediumträger gesintert wird.According to the invention, this object is achieved by a method according to claim 1 for producing an evaporator assembly, in particular for an evaporator burner of a vehicle heater, the evaporator assembly comprising an evaporator medium carrier, a porous evaporator medium and a heater, wherein the heater is at least partially embedded in the building material of the evaporator medium carrier. The evaporator medium carrier is produced by sintering, which facilitates the embedding of the heating device, namely in that the heating device is embedded in the unsintered build material of the evaporator medium carrier and then the evaporator medium carrier is sintered.

Da bei der erfindungsgemäß hergestellten Verdampferbaugruppe die Heizeinrichtung also wenigstens teilweise in das Aufbaumaterial des Verdampfermediumträgers eingebettet ist, rückt die Heizeinrichtung, ohne direkten Kontakt mit dem Verdampfermedium zu haben, näher an dieses heran. Dies bedeutet, dass ein geringerer Wärmeleitwiderstand überwunden werden muss, gleichwohl jedoch eine im Wesentlichen über die gesamte Kontaktfläche erlangbare Erwärmung zu einer entsprechenden gleichmäßigen Brennstoffverdampfung aus dem porösen Verdampfermedium führt.Since in the evaporator assembly according to the invention, the heating device is thus at least partially embedded in the building material of the evaporator medium carrier, the heater moves closer to this without having direct contact with the evaporator medium. This means that a lower thermal resistance must be overcome, however, however, a substantially achievable over the entire contact surface heating leads to a corresponding uniform fuel evaporation from the porous evaporator medium.

Da die Heizeinrichtung einen in Kontakt mit dem Verdampfermediumträger stehenden Heizleiter umfasst, kann bei einfach zu realisierendem Aufbau eine effiziente Erwärmung erzielt werden.Since the heating device comprises a heating conductor in contact with the evaporator medium carrier, efficient heating can be achieved with an easily realized structure.

Die Effizienz der Erwärmung kann dadurch sehr hoch gehalten werden, dass der Heizleiter vollständig in das Aufbaumaterial des Verdampfermediumträgers eingebettet wird. Es ist auf diese Art und Weise sichergestellt, dass die gesamte vom Heizleiter abgegebene Wärme zumindest in den Verdampfermediumträger eingeleitet und übertragen werden kann.The efficiency of the heating can be kept very high, that the heating element is completely embedded in the building material of the evaporator medium carrier. It is ensured in this way that the entire heat emitted by the heating element can be introduced and transferred at least into the evaporator medium carrier.

Vor allem dann, wenn der Verdampfermediumträger vergleichsweise dünn ausgestaltet ist, für die Aufnahme bzw. Einbettung des Heizleiters also nur vergleichsweise wenig Volumen bereitgestellt ist, wird vorgeschlagen, dass der Heizleiter nicht vollständig in das Aufbaumaterial des Verdampfermediumträgers eingebettet wird. Auf diese Art und Weise kann auch bei vergleichsweise dünnwandigem Verdampfermediumträger sichergestellt werden, dass zwischen dem Heizleiter und dem porösen Verdampfermedium noch ausreichend Aufbaumaterial des Verdampfermediumträgers vorhanden ist, welche eine Vergleichmäßigung des Wärmeeintrags in das poröse Verdampfermedium bewirkt.Especially when the evaporator medium carrier is made comparatively thin, so for the recording or embedding of the heating element so comparatively little volume is provided, it is proposed that the heating element is not completely embedded in the building material of the evaporator medium carrier. In this way, even with a comparatively thin-walled evaporator medium carrier, it can be ensured that sufficient build-up material of the evaporator medium carrier is still present between the heating conductor and the porous evaporator medium, which homogenization of the heat input into the porous evaporator medium.

Ferner betrifft die vorliegende Erfindung ein Fahrzeugheizgerät, welches eine Verdampferbaugruppe aufweist, die nach dem erfindungsgemäßen Verfahren hergestellt ist...Further, the present invention relates to a vehicle heater having an evaporator assembly made by the method of the present invention.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegenden Figuren detailliert beschrieben. Es zeigt:

Fig. 1
eine Schnittansicht einer erfindungsgemäß aufgebauten Verdampferbaugruppe;
Fig. 2
eine der Fig. 1 entsprechende Darstellung einer alternativen Ausgestaltungsform.
The present invention will be described below in detail with reference to the accompanying drawings. It shows:
Fig. 1
a sectional view of an inventively constructed evaporator assembly;
Fig. 2
one of the Fig. 1 corresponding representation of an alternative embodiment.

Die Fig. 1 zeigt eine Schnittansicht einer Verdampferbaugruppe 10 für ein Fahrzeugheizgerät. Diese Verdampferbaugruppe 10 umfasst einen hier topfartig ausgebildeten Verdampfermediumträger 12 mit einer Bodenwandung 14 und einer Umfangswandung 16. Dieser Verdampfermediumträger 12 kann in einem Brennkammergehäuse vorgesehen sein bzw. als Bodenbaugruppe zusammen mit einer Umfangswandung einer derartigen Brennkammerbaugruppe eine Brennkammer begrenzen.The Fig. 1 shows a sectional view of an evaporator assembly 10 for a vehicle heater. This evaporator assembly 10 comprises a pot-shaped evaporator medium carrier 12 having a bottom wall 14 and a peripheral wall 16. This evaporator medium carrier 12 can be provided in a combustion chamber housing or limit a combustion chamber together with a circumferential wall of such a combustion chamber assembly as a bottom assembly.

An seiner der Brennkammer zugewandt zu positionierenden Seite trägt der Verdampfermediumträger 12 ein poröses Verdampfermedium 18. Dieses beispielsweise aus Metallgeflecht, Netzwerk, Gewirk, Vliesmaterial oder Schaumkeramik aufgebaute poröse Verdampfermedium 18 empfängt über eine nicht dargestellte Brennstoffzuführleitung den flüssigen Brennstoff und verteilt diesen flüssigen Brennstoff in seinem Innenvolumenbereich durch die Kapillarförderwirkung der Porenstruktur. An einer der Brennkammer zugewandten Seite 20 tritt der Brennstoff in Dampfform aus dem porösen Verdampfermedium aus. An seiner von der Brennkammer abgewandten Seite 22 liegt das poröse Verdampfermedium 18 an einer Oberfläche 24 des Verdampfermediumträgers 12 an.At its side facing the combustion chamber to be positioned, the evaporator medium carrier 12 carries a porous evaporator medium 18. This porous evaporator medium 18 constructed for example of metal mesh, network, knitted fabric or ceramic foam receives the liquid fuel via a fuel supply line, not shown, and distributes this liquid fuel in its internal volume range by the capillary action of the pore structure. On a side facing the combustion chamber 20, the fuel exits in vapor form from the porous evaporator medium. On its side 22 facing away from the combustion chamber, the porous evaporator medium 18 abuts against a surface 24 of the evaporator medium carrier 12.

In die Bodenwandung 14 des Verdampfermediumträgers 12 ist ein Heizleiter 26 einer allgemein mit 28 bezeichneten Heizeinrichtung eingebettet. Der Heizleiter 26 kann beispielsweise spiralartig, wendelartig oder mäanderartig in das Aufbaumaterial des Verdampfermediumträgers 12 eingebettet sein. Man erkennt in Fig. 1, dass in Dickenrichtung der Bodenwandung 14 der Heizleiter 26 näherungsweise mittig im Bereich der Bodenwandung 14 angeordnet ist.In the bottom wall 14 of the evaporator medium carrier 12, a heating element 26 of a generally designated 28 heater is embedded. The heating conductor 26 may, for example, be spirally, helically or meander-like embedded in the building material of the evaporator medium carrier 12. One recognizes in Fig. 1 in that in the thickness direction of the bottom wall 14 the heating conductor 26 is arranged approximately centrally in the region of the bottom wall 14.

Durch das Einbetten des Heizleiters 26, und zwar bei der Ausgestaltungsform der Fig. 1 das vollständige Einbetten, wird ein sehr effizienter Wärmeübertrag der durch den Heizleiter 26 bereitgestellten Wärmeenergie auf den Verdampfermediumträger 12 bzw. das an dessen Oberfläche 24 anliegende poröse Verdampfermedium 18 erreicht. Da zwischen dem Heizleiter 26 und der Seite 22 des porösen Verdampfermediums 18 noch ausreichend Aufbaumaterial des Verdampfermediumträgers 12 liegt, wird durch Wärmeleitung und Wärmeverteilung im Verdampfermediumträger 12 ein sehr gleichmäßiger Wärmestrom in das poröse Verdampfermedium 18 eingeleitet. Lokale Überhitzungen werden dadurch vermieden. Gleichzeitig bringt die vollständige Einbettung des Heizleiters 26 den Vorteil mit sich, dass der Anteil nicht in Richtung zum porösen Verdampfermedium 18 geleiteter Wärmeenergie sehr gering gehalten werden kann.By embedding the heating element 26, in the embodiment of the Fig. 1 the complete embedding, a very efficient heat transfer of the thermal energy provided by the heating conductor 26 on the Evaporator medium carrier 12 or at the surface 24 adjacent porous evaporator medium 18 reaches. Since there is still sufficient build-up material of the evaporator medium carrier 12 between the heating conductor 26 and the side 22 of the porous evaporator medium 18, a very uniform heat flow is introduced into the porous evaporator medium 18 by heat conduction and heat distribution in the evaporator medium carrier 12. Local overheating is avoided. At the same time, the complete embedding of the heating element 26 has the advantage that the proportion of heat energy conducted in the direction of the porous evaporator medium 18 can be kept very low.

Zur Herstellung der in Fig. 1 dargestellten Verdampferbaugruppe 10 wird so vorgegangen, dass der Verdampfermediumträger 12 gesintert wird. Bei Durchführung des Sinterverfahrens kann der Heizleiter 26 in das zunächst in Pulverform vorliegende Aufbaumaterial eingebettet werden, und zwar an der dafür vorgesehenen Positionierung. Durch Druck- und Temperaturausübung wird dann der Verdampfermediumträger 12 gesintert und somit ein fester Verbund zwischen diesem und dem eingebetteten Heizleiter 26 hergestellt.For the production of in Fig. 1 illustrated evaporator assembly 10 is performed so that the evaporator medium carrier 12 is sintered. When carrying out the sintering process, the heating conductor 26 can be embedded in the building material initially present in powder form, namely at the positioning provided for this purpose. By applying pressure and temperature, the evaporator medium carrier 12 is then sintered and thus a solid bond between this and the embedded heating element 26 is produced.

Das poröse Verdampfermedium 18 kann an dem Verdampfermediumträger 12 in verschiedener Weise festgelegt werden. Beispielsweise kann nach Herstellung des Verdampfermediumträgers 12 an der Oberfläche 24 ein Film aus Lötmaterial aufgebracht werden, der aufgeschmolzen wird und dann einen Verbund zwischen dem auf diesem Film aus Lötmaterial aufliegenden porösen Verdampfermedium 18 und dem Verdampfermediumträger 12 realisiert. Auch ist es möglich, das poröse Verdampfermedium 18 in den Verdampfermediumträger 12 einzusintern. Hierbei kann beispielsweise ein bereits vorgefertigter Körper des porösen Verdampfermediums 18 verwendet werden und durch Erzeugen einer Sinterschicht im Angrenzungsbereich des Verdampfermediums 18 und des Verdampfermediumträgers 12 ein fester Verbund realisiert werden. Auch ist es denkbar, das poröse Verdampfermedium 18 in den Verdampfermediumträger 12 dadurch einzusintern, dass das Aufbaumaterial für das poröse Verdampfermedium 18 zunächst in pulver- bzw. partikelartiger Form auf den Verdampfermediumträger 12 aufgebracht wird und dann durch Druck- und Temperaturausübung die poröse, feste Struktur des porösen Verdampfermediums 18 erzeugt wird.The porous evaporator medium 18 may be fixed to the evaporator medium carrier 12 in various ways. For example, after the preparation of the evaporator medium carrier 12, a film of soldering material may be applied to the surface 24, which is melted and then realizes a bond between the porous evaporator medium 18 resting on this film of soldering material and the evaporator medium carrier 12. It is also possible to sinter the porous evaporator medium 18 into the evaporator medium carrier 12. Here, for example, an already prefabricated body of the porous evaporator medium 18 can be used and a solid bond can be realized by producing a sintered layer in the adjoining region of the evaporator medium 18 and the evaporator medium carrier 12. It is also conceivable for the porous evaporator medium 18 to be sintered into the evaporator medium carrier 12 in that the build-up material for the porous evaporator medium 18 is initially powdered. or particle-like form is applied to the evaporator medium carrier 12 and then by pressure and temperature exercise, the porous, solid structure of the porous evaporator medium 18 is generated.

Eine alternative Ausgestaltungsform der Verdampferbaugruppe 10 ist in Fig. 2 gezeigt. Hier sind Komponenten bzw. Baugruppen, die hinsichtlich Aufbau und Funktion voranstehend bereits beschriebenen Komponenten entsprechen, mit dem gleichen Bezugszeichen unter Hinzufügung des Anhangs "a" bezeichnet.An alternative embodiment of the evaporator assembly 10 is shown in FIG Fig. 2 shown. Here, components or assemblies which correspond to components already described above with regard to construction and function are designated by the same reference number with the addition of the appendix "a".

Man erkennt in Fig. 2, dass hier der Heizleiter 26a der Heizeinrichtung 28a nicht vollständig in die Bodenwandung 14a des Verdampfermediumträgers 12a eingebettet ist. Ein Teilbereich der Oberfläche des beispielsweise mit kreisrundem Querschnitt ausgebildeten Heizleiters 26a ragt über die von dem porösen Verdampfermedium 18a abgewandte Rückseite 30a aus der Bodenwandung 14a heraus.One recognizes in Fig. 2 in that here the heating conductor 26a of the heating device 28a is not completely embedded in the bottom wall 14a of the evaporator medium carrier 12a. A partial region of the surface of the heating conductor 26a, which is formed, for example, with a circular cross-section, projects out of the bottom wall 14a via the rear side 30a facing away from the porous evaporator medium 18a.

Auch diese Ausgestaltungsvariante kann dadurch hergestellt werden, dass bei der Herstellung des Verdampfermediumträgers 12a der Heizleiter 26a in das beispielsweise noch partikelartige Aufbaumaterial des Verdampfermediumträgers 12a eingebettet wird und zwar teilweise eingebettet wird, woraufhin dann der Sintervorgang durchgeführt wird.This embodiment variant can also be produced by, during the production of the evaporator medium carrier 12a, embedding the heating conductor 26a in the, for example, still particulate build-up material of the evaporator medium carrier 12a, namely partially embedded, whereupon the sintering process is carried out.

Die in Fig. 2 dargestellte Ausgestaltungsform bietet sich vor allem dann an, wenn die Bodenwandung 14a vergleichsweise dünn ist und bei vollständiger Einbettung des Heizleiters 26a in diese Bodenwandung 14a dann der Heizleiter 26a sehr nahe an die Oberfläche 24a heranrücken würde. Dies könnte wieder zu dem Problem einer zu stark lokal begrenzten thermischen Wechselwirkung des Heizleiters 26a mit dem porösen Verdampfermedium 18a führen. Dadurch, dass der Heizleiter 26a bei der in Fig. 2 gezeigten Ausgestaltungsform jedoch näher an der Rückseite 30a gehalten ist und aus dieser teilweise austritt, also mit einem Umfangsbereich seiner Außenoberfläche an der Seite 30a hervorsteht, ist zwischen dem Heizleiter 26a und der Seite 22a des porösen Verdampfermediums 18a noch ausreichend Aufbaumaterial des Verdampfermediumträgers 12a, das eine Vergleichmäßigung des Wärmeflusses erzeugt.In the Fig. 2 illustrated embodiment is particularly useful when the bottom wall 14a is comparatively thin and then would completely approach embedding the heating element 26a in this bottom wall 14a, the heating element 26a would approach very close to the surface 24a. This could again lead to the problem of too localized thermal interaction of the heating conductor 26a with the porous evaporator medium 18a. Characterized in that the heating conductor 26a at the in Fig. 2 However, the embodiment shown is held closer to the rear side 30a and partially exits therefrom, ie protrudes with a peripheral region of its outer surface on the side 30a, is between the heating conductor 26a and the Page 22a of the porous evaporator medium 18a still sufficient building material of the evaporator medium carrier 12a, which produces a homogenization of the heat flow.

Als Aufbaumaterial des Verdampfermediumträgers eignet sich insbesondere da dieser in einem Sinterverfahren hergestellt wird, Keramikmaterial, da dieses bei den auftretenden sehr hohen thermischen Belastungen eine sehr lange Betriebslebensdauer gewährleistet.As a building material of the evaporator medium carrier is particularly suitable because it is produced in a sintering process, ceramic material, as this ensures a very long service life at the occurring very high thermal loads.

Der Heizleiter kann selbstverständlich in verschiedenster Form realisiert sein, und die vom Heizleiter weg führenden Anschlüsse, mit welchen dieser an ein Energieversorgungssystem angeschlossen ist und welche in den Figuren nicht dargestellt sind, können an der Rückseite weggeführt sein, können selbstverständlich aber auch am Außenumfangsbereich der Bodenwandung bzw. der Umfangswandung aus dem Bereich des Verdampfermediumträgers weggeführt sein.The heating conductor can of course be implemented in various forms, and leading away from the heating conductor terminals, with which it is connected to a power supply system and which are not shown in the figures, can be guided away at the back, but can of course also on the outer peripheral portion of the bottom wall or the peripheral wall be led away from the area of the evaporator medium carrier.

Claims (5)

  1. Method for manufacturing an evaporator assembly, in particular for an evaporation burner of a vehicle heating device, wherein the evaporator assembly comprises a pot-like evaporator medium carrier (12; 12a) with a bottom wall (14; 14a) and a circumferential wall (16; 16a), a porous evaporator medium (18; 18a; 18b; 18c; 18d) carried at one side of the bottom wall (14; 14a) and a heating device (28; 28a), wherein the heating device (28; 28a) comprises a heating conductor (26; 26a) which is at least partly embedded in the construction material of said evaporator medium carrier (12; 12a) in the bottom wall (14; 14a; 14b; 14c) and thus comprises a heating conductor (26; 26a) in contact with the evaporator medium carrier (12; 12a),
    comprising embedding the heating conductor (26; 26a) of the heating device (28; 28a) in the construction material of said evaporator medium carrier (12; 12a), in which method said evaporator medium carrier (12; 12a) is produced through sintering in such a way that said heating conductor (26; 26a) of said heating device (28; 28a) is embedded in the non-sintered construction material of said evaporator medium carrier (12; 12a) and that then the evaporator medium carrier (12; 12a) is sintered.
  2. Method according to claim 1,
    characterized by said heating conductor (26) being completely embedded within the construction material of said evaporator medium carrier (12).
  3. Method according to claim 1
    characterized by said heating conductor (26a) not being completely embedded in the construction material of said evaporator medium carrier (12a; 12b).
  4. Method according to one of claims 1 to 3,
    characterized in that said evaporator medium carrier (12; 12a) is produced from ceramic material by sintering.
  5. Vehicle heating device, comprising an evaporator assembly manufactured according to a method of claims 1 to 4.
EP08017226.5A 2007-11-09 2008-09-30 Vaporiser component, in particular for a vaporizing burner of a vehicle heater and method for its production Active EP2058591B1 (en)

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Application Number Priority Date Filing Date Title
DE200710053488 DE102007053488A1 (en) 2007-11-09 2007-11-09 Evaporator assembly, in particular for an evaporator burner of a vehicle heater, and method for its preparation

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EP2058591A2 EP2058591A2 (en) 2009-05-13
EP2058591A3 EP2058591A3 (en) 2011-08-03
EP2058591B1 true EP2058591B1 (en) 2016-03-30

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Publication number Priority date Publication date Assignee Title
DE102009025593B4 (en) * 2009-06-19 2016-12-08 Eberspächer Climate Control Systems GmbH & Co. KG Evaporator assembly for an evaporator burner, in particular a vehicle heater
CN105509044B (en) * 2014-09-26 2018-05-04 承德坤元环保科技有限公司 A kind of manufacture method of fuel-gasifying cooking device

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DE10136292A1 (en) * 2001-07-25 2003-02-13 Eberspaecher J Gmbh & Co Vaporizer burner used in heating devices of motor vehicles comprises an ignition heating element igniting fuel vapor, and a vaporizer heating element influencing the vaporizing characteristics of a vaporizer medium
DE10251438C5 (en) 2002-11-05 2009-06-18 J. Eberspächer GmbH & Co. KG Evaporator burner, especially for a heater
DE10325574A1 (en) * 2003-06-05 2004-12-30 J. Eberspächer GmbH & Co. KG Combustion chamber arrangement for an evaporator burner, in particular for a vehicle heater
DE102004005267A1 (en) * 2004-02-03 2005-08-25 J. Eberspächer GmbH & Co. KG Vaporising burner for vehicle heater, has combustion chamber casing with double wall structure
DE102004020129B3 (en) 2004-04-26 2005-08-25 J. Eberspächer GmbH & Co. KG Evaporator set-up e.g. for fuel powered heater in motor vehicles, has porous evaporator medium and liquid fuel line arrangement leading to porous evaporator medium with heating mechanism at back of porous evaporator medium positioned away
DE102005045067A1 (en) * 2005-09-21 2007-03-22 J. Eberspächer GmbH & Co. KG Reformer for preparing hydrogen for a vehicle fuel cell comprises a vaporizing arrangement for producing a hydrocarbon/mixed material mixture and having a vaporizer housing with a base wall and a peripheral wall

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DE102007053488A1 (en) 2009-05-14
EP2058591A2 (en) 2009-05-13

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