EP1978302A2 - Vaporiser component, in particular for a vaporiser burner of a vehicle heater, and method for manufacturing a vaporiser component - Google Patents

Vaporiser component, in particular for a vaporiser burner of a vehicle heater, and method for manufacturing a vaporiser component Download PDF

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Publication number
EP1978302A2
EP1978302A2 EP08005168A EP08005168A EP1978302A2 EP 1978302 A2 EP1978302 A2 EP 1978302A2 EP 08005168 A EP08005168 A EP 08005168A EP 08005168 A EP08005168 A EP 08005168A EP 1978302 A2 EP1978302 A2 EP 1978302A2
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EP
European Patent Office
Prior art keywords
evaporator medium
evaporator
porous
carrier
medium carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08005168A
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German (de)
French (fr)
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EP1978302B1 (en
EP1978302A3 (en
Inventor
Günter Eberspach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Climate Control Systems GmbH and Co KG
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J Eberspaecher GmbH and Co KG
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Publication of EP1978302A2 publication Critical patent/EP1978302A2/en
Publication of EP1978302A3 publication Critical patent/EP1978302A3/en
Application granted granted Critical
Publication of EP1978302B1 publication Critical patent/EP1978302B1/en
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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/10—Burner material specifications ceramic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic

Definitions

  • the present invention relates to an evaporator assembly, for example for an evaporator burner of a vehicle heater.
  • evaporator assemblies generally include a cup-like evaporator media carrier having a porous evaporator medium disposed thereon. Liquid fuel is fed into this porous evaporator medium in order to distribute it by capillary action in the interior volume region of the porous evaporator medium and then to vaporize it on a surface of the evaporator medium facing a combustion chamber.
  • the evaporator medium carrier and the porous evaporator medium are generally constructed of metal material, for example sheet material being used for the evaporator medium carrier, while for the porous evaporator medium, for example, a metal fleece or mesh can be used.
  • an evaporator assembly in particular for an evaporator burner of a vehicle heater, comprising a cup-like evaporator medium carrier and a porous evaporator medium, wherein the porous evaporator medium is connected to a surface of the evaporator medium carrier by a flat solder joint.
  • the evaporator medium carrier is formed with a bottom wall and a circumferential wall and that the planar solder joint comprises substantially the entire adjoining region of the porous evaporator medium to a surface of the bottom wall.
  • planar solder connection comprises, as an alternative or in addition, substantially the entire adjoining area of the porous evaporator medium to a surface of the circumferential wall.
  • the evaporator medium carrier and / or the porous evaporator medium be made of metal material.
  • the pot-like evaporator medium carrier or / and the porous evaporator medium to be composed essentially of non-metallic material, preferably ceramic material.
  • the planar solder connection can be realized, for example, by the measure c) arranging soldering material on a surface the evaporator medium carrier and before or after carrying out the measure b) comprises the melting of the solder material.
  • the evaporator medium carrier comprises a bottom wall and a circumferential wall and that in the measure c) a flat solder joint between the porous evaporator medium and a surface of the bottom wall is produced on the surface of the bottom wall substantially in the entire boundary region of the porous evaporator medium is, or / and that in the measure c) a flat solder joint between the porous evaporator medium and a surface of the peripheral wall is made substantially in the entire abutment region of the porous evaporator medium to the surface of the peripheral wall.
  • the invention further relates to a vehicle heater with an evaporator burner, which is equipped with an inventively constructed or manufactured evaporator assembly.
  • evaporator assembly 10 is shown as it can be used for example in an evaporator burner of a vehicle heater.
  • the evaporator assembly 10 includes an evaporator media carrier 12 constructed of metal, such as sheet metal, generally a cup-like or shell-like structure is formed with a bottom wall 14 and an outer wall adjoining peripheral wall 16.
  • a porous evaporator medium 18 is used in this cup-like or shell-like structure of the evaporator medium carrier.
  • a fuel supply line 20 can pass through the bottom wall 14 and feed liquid fuel into the area of the porous evaporator medium 18 facing away from a combustion chamber.
  • the liquid fuel is distributed by capillary action and also supported by gravity in the porous evaporator medium and reach a combustion chamber facing surface 22 of the porous evaporator medium 18, from where the fuel is released in a vaporous configuration ,
  • the porous evaporator medium 18 produced, for example, from metal fleece, metal mesh or other pore-like metal material structure is dimensioned in accordance with the shaping of the evaporator medium carrier such that it bears against a surface 24 of the bottom wall 14 and also a surface 26 of the circumferential wall 16. In these abutment regions in which the porous evaporator medium adjoins the surfaces 24 and 26, respectively, as described below with reference to FIGS Fig. 2 explains, realized a flat solder joint between the porous evaporator medium 18 and the evaporator medium carrier 12.
  • a Lötmateriallage 30 is provided which the surface 24 is covered over and in which the end regions of the fibers 28 engage.
  • the Lötmateriallage 30 extends at least over the entire surface 24 of the bottom wall 14, of course, in the Fuel supply line 20 formed fuel supply opening 32 is recessed to allow the entry of fuel.
  • the soldering material layer 30 can also be provided in the adjoining area on the surface 26 of the circumferential wall 16, so that substantially the entire adjoining area of the porous evaporator medium 18 is realized on the evaporator medium carrier 16 with such a soldering material layer 30.
  • a significantly better thermal contact between the porous evaporator medium 18 and the evaporator medium carrier 12 is realized by providing the flat solder joint. If, for example, a heating device, for example in the form of an electrical heating conductor or the like, is provided on the rear side 34 of the evaporator medium carrier 12 facing away from the evaporator medium 18, the heat provided there can be introduced significantly better into the porous evaporator medium 18 through the evaporator medium carrier 12 and thus the fuel evaporation be supported much more efficiently.
  • the coating is essentially the whole Surfaces 24, 26 with the Lötmateriallage represents a particularly advantageous variant.
  • the realization of the planar solder joint with the soldering material 30 substantially only in the region of the surface 26 of the peripheral wall 16 can already bring significantly improved Abdampfungseigenschaften, since then the uncontrolled leakage of liquid fuel, especially in this adjoining region in the direction of the combustion chamber is no longer possible ,
  • solder material into the evaporator medium carrier 12, wherein a solder material blank may be used here, especially if a soldering material layer 30 is to be provided on the peripheral wall 16 which has a ring-shaped, cup-like structure adapted to the shape of the evaporator medium carrier 12.
  • the porous evaporator medium 18 can then be used. Thereafter, the entire assembly can be heated, so that in the adjoining region of the porous evaporator medium 18 to the evaporator medium carrier 12 existing solder material melts and can penetrate by the capillary effect in the near-surface region of the porous evaporator medium 18. In this way, a soldering material layer 30 formed substantially without interruptions is realized, which, after cooling and curing, realizes a fixed connection of the porous evaporator medium 18 to the evaporator medium carrier 12.
  • the soldering material for the soldermaking layer to be formed there can first be inserted into the evaporator medium carrier 12, then melted, whereupon the porous material is then removed Evaporator medium 18 is placed.
  • the melting of the soldering material introduced, for example, in a granular structure this will form a layer of liquid soldering material covering the entire region of the bottom wall 14.
  • the evaporator medium carrier, the brazing material or the porous evaporator medium may be advantageous to weight the evaporator medium carrier, the brazing material or the porous evaporator medium by a weight. This ensures that possibly existing gaps in the adjoining region of the porous evaporator medium are removed to the evaporator medium carrier, especially when these assemblies are heated to melt the solder material. The solder material is then evenly distributed in the transition region between the evaporator medium carrier and the evaporator medium by capillary action and thus produces a very uniform connection effect. The emergence of larger gaps, in which reinforced solder material is accumulated, can thus be prevented.
  • the pot-like or shell-like evaporator medium carrier 12 or also the porous evaporator medium 18 of metal material, so that not only a positive-fit connection obtained by the penetration of the soldering material into the porous structure of the porous evaporator medium 18 is generated, but also a material connection.
  • the evaporator medium carrier 12 and / or the porous evaporator medium 18 is generally made of non-metallic material such. B. ceramic material to build.
  • the porous evaporator medium 18 As a result of the penetration of the liquefied soldering material into the regions of the pore structure close to the surface after curing of this soldering material, a very firm material section is formed by the engagement of the pore structure generated holding effect achieved.
  • the evaporator medium carrier 12 made of non-metallic material such. B. ceramic material, it is possible to metallize this, for example, to evaporate a thin metal layer, so that it is constructed in particular in particular for obtaining insulation properties, non-metallic, for example, good heat insulating material, by providing a metal coating, however, nevertheless Use of the solder joint a firm connection of the porous evaporator medium 18 is achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wick-Type Burners And Burners With Porous Materials (AREA)

Abstract

The assembly has a pot-like evaporator medium carrier (12) and a porous evaporator medium (18) that is fastened to surfaces (24, 26) of the evaporator medium carrier by a laminar soldering joint. The evaporator medium carrier is formed with a bottom wall (14) and a peripheral wall (16), and the laminar soldering joint includes an entire abutment region of the porous evaporator medium on the surface (24) of the bottom wall. The pot-like evaporator medium carrier and a porous evaporator medium are made of metallic and non-metallic material, and ceramic material. An independent claim is also included for a method for producing an evaporator assembly for an evaporator burner of a vehicle heater.

Description

Die vorliegende Erfindung betrifft eine Verdampferbaugruppe, beispielsweise für einen Verdampferbrenner eines Fahrzeugheizgerätes. Derartige Verdampferbaugruppen umfassen im Allgemeinen einen topfartigen Verdampfermediumträger mit einem daran angeordneten porösen Verdampfermedium. In dieses poröse Verdampfermedium wird flüssiger Brennstoff eingespeist, um diesen durch Kapillarförderwirkung im Innenvolumenbereich des porösen Verdampfermediums zu verteilen und dann an einer einer Brennkammer zugewandt liegenden Oberfläche des Verdampfermediums abzudampfen. Aufgrund der erforderlichen thermischen Beständigkeit derartiger Verdampferbaugruppen sind im Allgemeinen der Verdampfermediumträger und das poröse Verdampfermedium aus Metallmaterial aufgebaut, wobei für den Verdampfermediumträger beispielsweise Blechmaterial eingesetzt wird, während für das poröse Verdampfermedium beispielsweise ein Metallvlies oder -geflecht eingesetzt werden kann.The present invention relates to an evaporator assembly, for example for an evaporator burner of a vehicle heater. Such evaporator assemblies generally include a cup-like evaporator media carrier having a porous evaporator medium disposed thereon. Liquid fuel is fed into this porous evaporator medium in order to distribute it by capillary action in the interior volume region of the porous evaporator medium and then to vaporize it on a surface of the evaporator medium facing a combustion chamber. Due to the required thermal stability of such evaporator assemblies, the evaporator medium carrier and the porous evaporator medium are generally constructed of metal material, for example sheet material being used for the evaporator medium carrier, while for the porous evaporator medium, for example, a metal fleece or mesh can be used.

Bei derartigen Verdampferbaugruppen ist es bekannt, die Verbindung zwischen dem porösen Verdampfermedium und dem Verdampfermediumträger durch Punktschweißen oder durch Sintern herzustellen. Sowohl die Schweißverbindung als auch die Sinterverbindung hat eine nur punktuelle Anbindung des porösen Verdampfermediums an die Oberfläche des Verdampfermediumträgers zur Folge. Insbesondere werden bei der Herstellung einer Sinterverbindung die einzelnen Fasern des porösen Verdampfermediums im Bereich ihrer an den Verdampfermediumträger angrenzenden Enden bzw. Oberflächen durch punktuelle Verbindung angesintert. Zwischen diesen punktuellen Verbindungen entstehen vergleichsweise große kanalartige Strukturen, welche zur Folge haben, dass ein vergleichsweise großer Anteil des in die Verdampferbaugruppe eingespeisten flüssigen Brennstoffs sich entlang dieser kanalartigen Strukturen im Angrenzungsbereich des porösen Verdampfermediums an die Oberfläche des Verdampfermediumträgers bewegt und an diesem Angrenzungsbereich dann auch in flüssiger, also nicht verdampfter Form in Richtung Brennkammer austritt. Ein weiteres Problem ist eine vergleichsweise schlechte Wärmekopplung zwischen dem porösen Verdampfermedium und dem Verdampfermediumträger. Eine beispielsweise in Form einer Heizwendel ausgestaltete und an der Außenseite des Verdampfermediumträgers vorgesehene Heizeinrichtung, welche durch elektrische Erregung für eine zusätzliche Erwärmung der Verdampferbaugruppe sorgen kann, ist dabei dann nur vergleichsweise schlecht an das poröse Verdampfermedium thermisch angekoppelt.In such evaporator assemblies, it is known to make the connection between the porous evaporator medium and the evaporator medium carrier by spot welding or by sintering. Both the welded connection and the sintered connection result in only a selective connection of the porous evaporator medium to the surface of the evaporator medium carrier. In particular, in the production of a sintered compound, the individual fibers of the porous evaporator medium are sintered in the region of their ends or surfaces adjoining the evaporator medium carrier by punctiform connection. Between these punctual connections, comparatively large channel-like structures arise, which result in a comparatively large proportion of the liquid fuel fed into the evaporator assembly is moved along the channel-like structures in the adjoining region of the porous evaporator medium to the surface of the evaporator medium carrier and then exits at this adjoining region in the direction of the combustion chamber in liquid, that is not vaporized form. Another problem is a comparatively poor thermal coupling between the porous evaporator medium and the evaporator medium carrier. A designed for example in the form of a heating coil and provided on the outside of the evaporator medium carrier heater, which can provide by electrical excitation for additional heating of the evaporator assembly is then only relatively poorly thermally coupled to the porous evaporator medium.

Es ist die Aufgabe der vorliegenden Erfindung, eine Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes, und ein Verfahren zur Herstellung derselben bereitzustellen, mit welchen bei verbesserter Brennstoffverteilungscharakteristik auch eine bessere thermische Kopplung zwischen dem porösen Verdampfermedium und dem Verdampfermediumträger erlangt werden kann.It is the object of the present invention to provide an evaporator assembly, in particular for an evaporator burner of a vehicle heater, and a method for producing the same, with which with improved fuel distribution characteristics, a better thermal coupling between the porous evaporator medium and the evaporator medium carrier can be obtained.

Erfindungsgemäß wird diese Aufgabe gelöst durch eine Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes, umfassend einen topfartigen Verdampfermediumträger sowie ein poröses Verdampfermedium, wobei das poröse Verdampfermedium an eine Oberfläche des Verdampfermediumträgers durch eine flächige Lötverbindung angebunden ist.According to the invention, this object is achieved by an evaporator assembly, in particular for an evaporator burner of a vehicle heater, comprising a cup-like evaporator medium carrier and a porous evaporator medium, wherein the porous evaporator medium is connected to a surface of the evaporator medium carrier by a flat solder joint.

Durch das Bereitstellen einer flächigen Lötverbindung wird das Entstehen kanalartiger Strukturen im Angrenzungsbereich des porösen Verdampfermediums an den Verdampfermediumträger vermieden. Gleichzeitig wird durch diese flächige Verbindung, also die Ausbreitung des Lötmaterials über die Oberfläche des Verdampfermediumträgers, eine deutlich verbesserte thermische Ankopplung des porösen Verdampfermediums an den Verdampfermediumträger realisiert.By providing a flat solder joint, the formation of channel-like structures in the adjoining area of the porous evaporator medium to the evaporator medium carrier is avoided. At the same time, a significantly improved thermal coupling of the porous evaporator medium to the evaporator medium carrier is realized by means of this planar connection, that is to say the propagation of the solder material over the surface of the evaporator medium carrier.

Beispielsweise kann vorgesehen sein, dass der Verdampfermediumträger mit einer Bodenwandung und einer Umfangswandung ausgebildet ist und dass die flächige Lötverbindung im Wesentlichen den gesamten Angrenzungsbereich des porösen Verdampfermediums an eine Oberfläche der Bodenwandung umfasst.For example, it may be provided that the evaporator medium carrier is formed with a bottom wall and a circumferential wall and that the planar solder joint comprises substantially the entire adjoining region of the porous evaporator medium to a surface of the bottom wall.

Um auch in Umfangsbereichen das Entstehen von kanalartigen Strukturen zu vermeiden, wird weiter vorgeschlagen, dass die flächige Lötverbindung alternativ oder zusätzlich im Wesentlichen den gesamten Angrenzungsbereich des porösen Verdampfermediums an eine Oberfläche der Umfangswandung umfasst.In order to avoid the formation of channel-like structures even in peripheral areas, it is further proposed that the planar solder connection comprises, as an alternative or in addition, substantially the entire adjoining area of the porous evaporator medium to a surface of the circumferential wall.

Um in einfacher Art und Weise die Lötverbindung realisieren zu können, wird vorgeschlagen, der Verdampfermediumträger oder/und das poröse Verdampfermedium aus Metallmaterial aufgebaut ist.In order to be able to realize the solder connection in a simple manner, it is proposed that the evaporator medium carrier and / or the porous evaporator medium be made of metal material.

Alternativ ist es möglich, dass der topfartige Verdampfermediumträger oder/und das poröse Verdampfermedium im Wesentlichen aus nicht metallischem Material, vorzugsweise Keramikmaterial, aufgebaut ist.Alternatively, it is possible for the pot-like evaporator medium carrier or / and the porous evaporator medium to be composed essentially of non-metallic material, preferably ceramic material.

Gemäß einem weiteren Aspekt wird die voranstehende Aufgabe gelöst durch ein Verfahren zur Herstellung einer Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes, umfassend die Maßnahmen:

  1. a) Bereitstellen eines topfartigen Verdampfermediumträgers,
  2. b) Anordnen eines porösen Verdampfermediums an dem Verdampfermediumträger,
  3. c) Herstellen einer flächigen Lötverbindung zwischen dem porösen Verdampfermedium und dem Verdampfermediumträger.
According to a further aspect, the above object is achieved by a method for producing an evaporator assembly, in particular for an evaporator burner of a vehicle heater, comprising the measures:
  1. a) providing a pot-like evaporator medium carrier,
  2. b) arranging a porous evaporator medium on the evaporator medium carrier,
  3. c) producing a flat solder joint between the porous evaporator medium and the evaporator medium carrier.

Die flächige Lötverbindung kann beispielsweise dadurch realisiert werden, dass die Maßnahme c) das Anordnen von Lötmaterial an einer Oberfläche des Verdampfermediumträgers und vor oder nach Durchführung der Maßnahme b) das Schmelzen des Lötmaterials umfasst.The planar solder connection can be realized, for example, by the measure c) arranging soldering material on a surface the evaporator medium carrier and before or after carrying out the measure b) comprises the melting of the solder material.

Bei dem erfindungsgemäßen Verfahren kann vorgesehen sein, dass der Verdampfermediumträger eine Bodenwandung sowie eine Umfangswandung umfasst und dass bei der Maßnahme c) eine flächige Lötverbindung zwischen dem porösen Verdampfermedium und einer Oberfläche der Bodenwandung im Wesentlichen im gesamten Angrenzungsbereich des porösen Verdampfermediums an die Oberfläche der Bodenwandung hergestellt wird, oder/und dass bei der Maßnahme c) eine flächige Lötverbindung zwischen dem porösen Verdampfermedium und einer Oberfläche der Umfangswandung im Wesentlichen im gesamten Angrenzungsbereich des porösen Verdampfermediums an die Oberfläche der Umfangswandung hergestellt wird.In the method according to the invention, it can be provided that the evaporator medium carrier comprises a bottom wall and a circumferential wall and that in the measure c) a flat solder joint between the porous evaporator medium and a surface of the bottom wall is produced on the surface of the bottom wall substantially in the entire boundary region of the porous evaporator medium is, or / and that in the measure c) a flat solder joint between the porous evaporator medium and a surface of the peripheral wall is made substantially in the entire abutment region of the porous evaporator medium to the surface of the peripheral wall.

Die Erfindung betrifft ferner ein Fahrzeugheizgerät mit einem Verdampferbrenner, der mit einer erfindungsgemäß aufgebauten bzw. hergestellten Verdampferbaugruppe ausgestattet ist.The invention further relates to a vehicle heater with an evaporator burner, which is equipped with an inventively constructed or manufactured evaporator assembly.

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

Fig. 1
eine Schnittansicht einer Verdampferbaugruppe für einen Verdampferbrenner;
Fig. 2
eine vergrößerte Detailansicht, welche im Angrenzungsbereich vom porösen Verdampfermedium an einen Verdampfermediumträger veranschaulicht.
The invention will be described in detail below with reference to the accompanying figures. It shows:
Fig. 1
a sectional view of an evaporator assembly for an evaporator burner;
Fig. 2
an enlarged detail view illustrating in the adjoining area of the porous evaporator medium to an evaporator medium carrier.

In Fig. 1 ist eine Verdampferbaugruppe 10 gezeigt, wie sie beispielsweise in einem Verdampferbrenner eines Fahrzeugheizgerätes eingesetzt werden kann. Die Verdampferbaugruppe 10 umfasst einen aus Metall, beispielsweise Blechmaterial, aufgebauten Verdampfermediumträger 12, der im Allgemeinen eine topfartige bzw. schalenartige Struktur mit einer Bodenwandung 14 und einer im Außenbereich daran anschließenden Umfangswandung 16 ausgebildet ist. In diese topfartige bzw. schalenartige Struktur des Verdampfermediumträgers ist ein poröses Verdampfermedium 18 eingesetzt. Eine Brennstoffzuführleitung 20 kann die Bodenwandung 14 durchsetzen und flüssigen Brennstoff in den von einer Brennkammer abgewandt liegenden Bereich des porösen Verdampfermediums 18 einspeisen. Aufgrund der porenartigen Struktur des porösen Verdampfermediums 18 wird sich der flüssige Brennstoff sich durch Kapillarförderwirkung und auch unterstützt durch Schwerkraft im porösen Verdampfermedium verteilen und zu einer einer Brennkammer zugewandt liegenden Oberfläche 22 des porösen Verdampfermediums 18 gelangen, von wo aus der Brennstoff in dampfförmiger Konfiguration abgegeben wird.In Fig. 1 an evaporator assembly 10 is shown as it can be used for example in an evaporator burner of a vehicle heater. The evaporator assembly 10 includes an evaporator media carrier 12 constructed of metal, such as sheet metal, generally a cup-like or shell-like structure is formed with a bottom wall 14 and an outer wall adjoining peripheral wall 16. In this cup-like or shell-like structure of the evaporator medium carrier, a porous evaporator medium 18 is used. A fuel supply line 20 can pass through the bottom wall 14 and feed liquid fuel into the area of the porous evaporator medium 18 facing away from a combustion chamber. Due to the pore-like structure of the porous evaporator medium 18, the liquid fuel is distributed by capillary action and also supported by gravity in the porous evaporator medium and reach a combustion chamber facing surface 22 of the porous evaporator medium 18, from where the fuel is released in a vaporous configuration ,

Das beispielsweise aus Metallvlies, Metallgeflecht oder sonstiger porenartiger Metallmaterialstruktur hergestellte poröse Verdampfermedium 18 ist in Abstimmung auf die Formgebung des Verdampfermediumträgers so dimensioniert, dass es an einer Oberfläche 24 der Bodenwandung 14 und auch einer Oberfläche 26 der Umfangswandung 16 anliegt. In diesen Angrenzungsbereichen, in welchen das poröse Verdampfermedium an die Oberflächen 24 bzw. 26 angrenzt, ist, wie nachfolgend mit Bezug auf die Fig. 2 erläutert, eine flächige Lötverbindung zwischen dem porösen Verdampfermedium 18 und dem Verdampfermediumträger 12 realisiert.The porous evaporator medium 18 produced, for example, from metal fleece, metal mesh or other pore-like metal material structure is dimensioned in accordance with the shaping of the evaporator medium carrier such that it bears against a surface 24 of the bottom wall 14 and also a surface 26 of the circumferential wall 16. In these abutment regions in which the porous evaporator medium adjoins the surfaces 24 and 26, respectively, as described below with reference to FIGS Fig. 2 explains, realized a flat solder joint between the porous evaporator medium 18 and the evaporator medium carrier 12.

Man erkennt in Fig. 2 einen Ausschnitt der Bodenwandung 14 des Verdampfermediumträgers 12 sowie einige stark vergrößert dargestellte Fasern 28 des hier beispielsweise aus Metallvlies aufgebauten porösen Verdampfermediums 18. Dort, wo die Endbereiche der Fasern 28 an die Oberfläche 24 angrenzen bzw. dort anliegen, ist eine Lötmateriallage 30 vorgesehen, welche die Oberfläche 24 flächig überdeckt und in welche die Endbereiche der Fasern 28 eingreifen. Bei einer bevorzugten Ausgestaltungsform erstreckt sich die Lötmateriallage 30 zumindest über die gesamte Oberfläche 24 der Bodenwandung 14, wobei selbstverständlich die in der Brennstoffzuführleitung 20 ausgebildete Brennstoffzuführöffnung 32 ausgespart ist, um den Eintritt von Brennstoff zu ermöglichen. Auch im Angrenzungsbereich an die Oberfläche 26 der Umfangswandung 16 kann die Lötmateriallage 30 vorgesehen sein, so dass im Wesentlichen der gesamte Angrenzungsbereich des porösen Verdampfermediums 18 an den Verdampfermediumträger 16 mit einer derartigen Lötmateriallage 30 realisiert ist.One recognizes in Fig. 2 a section of the bottom wall 14 of the evaporator medium carrier 12 and some strongly enlarged illustrated fibers 28 of here constructed, for example, metal fleece porous evaporator medium 18. Where the end portions of the fibers 28 adjacent to the surface 24 and abut there, a Lötmateriallage 30 is provided which the surface 24 is covered over and in which the end regions of the fibers 28 engage. In a preferred embodiment, the Lötmateriallage 30 extends at least over the entire surface 24 of the bottom wall 14, of course, in the Fuel supply line 20 formed fuel supply opening 32 is recessed to allow the entry of fuel. The soldering material layer 30 can also be provided in the adjoining area on the surface 26 of the circumferential wall 16, so that substantially the entire adjoining area of the porous evaporator medium 18 is realized on the evaporator medium carrier 16 with such a soldering material layer 30.

Durch diese flächige Ausgestaltung der Lötmateriallage 30 wird das Entstehen von kanalartigen Strukturen an der Rückseite des porösen Verdampfermediums 18 vermieden. Dies hat zur Folge, dass zwischen dem porösen Verdampfermedium 18 und den Oberflächen 24, 26 des Verdampfermediumträgers 12 keine bevorzugte Brennstoffströmung entstehen kann, die dann an den der Brennkammer zugewandt liegenden Enden insbesondere des Angrenzungsbereichs des porösen Verdampfermediums 18 an die Oberfläche 26 der Umfangswandung 16 austreten können. Es wird eine Strömung bzw. Verteilung des flüssigen Brennstoffs ausschließlich im Innenvolumenbereich des porösen Verdampfermediums 18 erzwungen, was eine deutlich gleichmäßigere Verteilung der an der Oberfläche 22 austretenden Brennstoffmenge zur Folge hat.As a result of this planar configuration of the soldering material layer 30, the formation of channel-like structures on the rear side of the porous evaporator medium 18 is avoided. As a result, no preferred fuel flow can arise between the porous evaporator medium 18 and the surfaces 24, 26 of the evaporator medium carrier 12, which then exit at the ends of the porous evaporator medium 18 at the ends 26 facing the combustion chamber, in particular at the abutment region of the porous evaporator medium 16 can. A flow or distribution of the liquid fuel is forced exclusively in the inner volume region of the porous evaporator medium 18, which results in a much more even distribution of the fuel quantity leaving the surface 22.

Neben der Vergleichmäßigung der Brennstoffverteilung wird durch das Bereitstellen der flächigen Lötverbindung auch ein deutlich besserer thermischer Kontakt zwischen dem porösen Verdampfermedium 18 und dem Verdampfermediumträger 12 realisiert. Ist beispielsweise an der vom Verdampfermedium 18 abgewandten Rückseite 34 des Verdampfermediumträgers 12 eine Heizeinrichtung, beispielsweise in Form eines elektrischen Heizleiters oder dergleichen vorgesehen, so kann die dort bereitgestellte Wärme durch den Verdampfermediumträger 12 hindurch deutlich besser in das poröse Verdampfermedium 18 eingetragen werden und somit die Brennstoffabdampfung wesentlich effizienter unterstützt werden.In addition to the homogenization of the fuel distribution, a significantly better thermal contact between the porous evaporator medium 18 and the evaporator medium carrier 12 is realized by providing the flat solder joint. If, for example, a heating device, for example in the form of an electrical heating conductor or the like, is provided on the rear side 34 of the evaporator medium carrier 12 facing away from the evaporator medium 18, the heat provided there can be introduced significantly better into the porous evaporator medium 18 through the evaporator medium carrier 12 and thus the fuel evaporation be supported much more efficiently.

Es sei darauf hingewiesen, dass das Überziehen im Wesentlichen der gesamten Oberflächen 24, 26 mit der Lötmateriallage eine besonders vorteilhafte Variante darstellt. Insbesondere abhängig von der konkreten Formgebung des Verdampfermediumträgers 12 kann es jedoch auch bereits ausreichend sein, im Bereich der Oberfläche 24 eine derartige flächige Anbindung zu realisieren. Auch die Realisierung der flächigen Lötverbindung mit dem Lötmaterial 30 im Wesentlichen nur im Bereich der Oberfläche 26 der Umfangswandung 16 kann bereits deutlich verbesserte Abdampfungseigenschaften mit sich bringen, da dann der unkontrollierte Austritt von flüssigem Brennstoff insbesondere in diesem Angrenzungsbereich in Richtung zur Brennkammer nicht mehr möglich ist.It should be noted that the coating is essentially the whole Surfaces 24, 26 with the Lötmateriallage represents a particularly advantageous variant. In particular, depending on the specific shaping of the evaporator medium carrier 12, however, it may already be sufficient to realize such a planar connection in the region of the surface 24. Also, the realization of the planar solder joint with the soldering material 30 substantially only in the region of the surface 26 of the peripheral wall 16 can already bring significantly improved Abdampfungseigenschaften, since then the uncontrolled leakage of liquid fuel, especially in this adjoining region in the direction of the combustion chamber is no longer possible ,

Zur Herstellung der vorangehend beschriebenen Verdampferbaugruppe 10 kann beispielsweise so vorgegangen werden, dass in den Verdampfermediumträger 12 zunächst das Lötmaterial eingebracht wird, wobei hier vor allem dann, wenn auch oder nur an der Umfangswandung 16 eine Lötmateriallage 30 vorgesehen sein soll, ein Lötmaterialrohling verwendet werden kann, der eine an die Formgebung des Verdampfermediumträgers 12 angepasste ringartige, schalenartige bzw. topfartige Struktur aufweist. Nach Positionieren dieses Lötmaterials in dem Verdampfermediumträger 12 kann dann das poröse Verdampfermedium 18 eingesetzt werden. Daraufhin kann die gesamte Baugruppe erwärmt werden, so dass das im Angrenzungsbereich des porösen Verdampfermediums 18 an den Verdampfermediumträger 12 vorhandene Lötmaterial schmilzt und durch den Kapillareffekt in den oberflächennahen Bereich des porösen Verdampfermediums 18 eindringen kann. Auf diese Art und Weise wird eine im Wesentlichen ohne Unterbrechungen ausgebildete Lötmateriallage 30 realisiert, die nach dem Abkühlen und Aushärten eine feste Anbindung des porösen Verdampfermediums 18 an den Verdampfermediumträger 12 realisiert.To produce the above-described evaporator assembly 10, for example, it is possible to introduce the solder material into the evaporator medium carrier 12, wherein a solder material blank may be used here, especially if a soldering material layer 30 is to be provided on the peripheral wall 16 which has a ring-shaped, cup-like structure adapted to the shape of the evaporator medium carrier 12. After positioning this soldering material in the evaporator medium carrier 12, the porous evaporator medium 18 can then be used. Thereafter, the entire assembly can be heated, so that in the adjoining region of the porous evaporator medium 18 to the evaporator medium carrier 12 existing solder material melts and can penetrate by the capillary effect in the near-surface region of the porous evaporator medium 18. In this way, a soldering material layer 30 formed substantially without interruptions is realized, which, after cooling and curing, realizes a fixed connection of the porous evaporator medium 18 to the evaporator medium carrier 12.

Soll lediglich im Bereich der Bodenwandung 14 eine derartige flächige Anbindung realisiert werden, so kann das Lötmaterial für die dort zu bildende Lötmateriallage zunächst in den Verdampfermediumträger 12 eingelegt werden, dann geschmolzen werden, woraufhin dann das poröse Verdampfermedium 18 aufgelegt wird. Durch das Schmelzen des beispielsweise in körniger Struktur eingebrachten Lötmaterials wird dieses eine den gesamten Bereich der Bodenwandung 14 überdeckende Lage fllüssigen Lötmaterials bilden. Selbstverständlich ist es auch in diesem Falle möglich, das Lötmaterial erst dann aufzuschmelzen, wenn das poröse Verdampfermedium 18 eingelegt worden ist.If such a planar connection is to be realized only in the region of the bottom wall 14, then the soldering material for the soldermaking layer to be formed there can first be inserted into the evaporator medium carrier 12, then melted, whereupon the porous material is then removed Evaporator medium 18 is placed. As a result of the melting of the soldering material introduced, for example, in a granular structure, this will form a layer of liquid soldering material covering the entire region of the bottom wall 14. Of course, it is also possible in this case to melt the solder material only when the porous evaporator medium 18 has been inserted.

Bei der vorangehend beschriebenen Herstellungsprozedur kann es vorteilhaft sein, durch ein Gewicht den Verdampfermediumträger, das Lötmaterial bzw. das poröse Verdampfermedium zu beschweren. Dadurch wird erreicht, dass möglicherweise noch vorhandene Spalte im Angrenzungsbereich des porösen Verdampfermediums an den Verdampfermediumträger beseitigt werden, insbesondere auch dann, wenn diese Baugruppen zum Aufschmelzen des Lötmaterials erwärmt werden. Das Lötmaterial verteilt sich dann auch im Übergangsbereich zwischen dem Verdampfermediumträger und dem Verdampfermedium durch Kapillarwirkung flächig und erzeugt somit eine sehr gleichmäßige Anbindungswirkung. Das Entstehen größerer Spalte, in welchen auch verstärkt Lötmaterial angesammelt wird, kann somit verhindert werden.In the manufacturing procedure described above, it may be advantageous to weight the evaporator medium carrier, the brazing material or the porous evaporator medium by a weight. This ensures that possibly existing gaps in the adjoining region of the porous evaporator medium are removed to the evaporator medium carrier, especially when these assemblies are heated to melt the solder material. The solder material is then evenly distributed in the transition region between the evaporator medium carrier and the evaporator medium by capillary action and thus produces a very uniform connection effect. The emergence of larger gaps, in which reinforced solder material is accumulated, can thus be prevented.

Wie vorangehend bereits beschrieben, ist es möglich, den topfartigen bzw. schalenartigen Verdampfermediumträger 12 bzw. auch das poröse Verdampfermedium 18 aus Metallmaterial aufzubauen, so dass insbesondere im Bereich des porösen Verdampfermediums 18 nicht nur eine durch das Eindringen des Lötmaterials in die Porenstruktur desselben erhaltene Formschlussanbindung erzeugt wird, sondern auch eine Materialschlussanbindung. Gleichwohl ist es auch möglich, den Verdampfermediumträger 12 oder/und das poröse Verdampfermedium 18 grundsätzlich aus nicht metallischem Material, wie z. B. Keramikmaterial, aufzubauen. Im Falle des porösen Verdampfermediums 18 wird durch das Eindringen des verflüssigten Lötmaterials in die oberflächennahen Bereiche der Porenstruktur nach dem Aushärten dieses Lötmaterials eine sehr feste, durch das Hintergreifen von die Porenstruktur bildenden Materialabschnitten generierte Haltewirkung erzielt. Bei Ausgestaltung des Verdampfermediumträgers 12 aus nicht metallischem Material, wie z. B. Keramikmaterial, ist es möglich, diesen zu metallisieren, also beispielsweise eine dünne Metallschicht aufzudampfen, so dass er im Wesentlichen insbesondere auch zur Erlangung von Isolationseigenschaften, aus nicht metallischem, beispielsweise gut wärmeisolierenden Material aufgebaut ist, durch das Vorsehen eines Metallüberzugs jedoch gleichwohl bei Einsatz der Lötverbindung eine feste Anbindung des porösen Verdampfermediums 18 erzielt wird.As already described above, it is possible to construct the pot-like or shell-like evaporator medium carrier 12 or also the porous evaporator medium 18 of metal material, so that not only a positive-fit connection obtained by the penetration of the soldering material into the porous structure of the porous evaporator medium 18 is generated, but also a material connection. Nevertheless, it is also possible, the evaporator medium carrier 12 and / or the porous evaporator medium 18 is generally made of non-metallic material such. B. ceramic material to build. In the case of the porous evaporator medium 18, as a result of the penetration of the liquefied soldering material into the regions of the pore structure close to the surface after curing of this soldering material, a very firm material section is formed by the engagement of the pore structure generated holding effect achieved. In embodiment of the evaporator medium carrier 12 made of non-metallic material such. B. ceramic material, it is possible to metallize this, for example, to evaporate a thin metal layer, so that it is constructed in particular in particular for obtaining insulation properties, non-metallic, for example, good heat insulating material, by providing a metal coating, however, nevertheless Use of the solder joint a firm connection of the porous evaporator medium 18 is achieved.

Abschließend sei darauf hingewiesen, dass eine derartige Verdampferbaugruppe selbstverständlich nicht nur in Verbindung mit einem Verdampferbrenner eines Fahrzeugheizgeräts eingesetzt werden kann. Auch in zur Herstellung von wasserstoffhaltigem Gas für Brennstoffzellen eingesetzten Reformern, in welchen flüssiger Kohlenwasserstoff in die Dampfphase zu überführen ist, kann der erfindungsgemäße Aufbau seine Vorteile entfalten.Finally, it should be noted that such an evaporator assembly can of course be used not only in conjunction with an evaporator burner of a vehicle heater. Also used in the production of hydrogen-containing gas for fuel cells reformers, in which liquid hydrocarbon is to be converted into the vapor phase, the structure of the invention can develop its advantages.

Claims (10)

Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes, umfassend einen topfartigen Verdampfermediumträger (12) sowie ein poröses Verdampfermedium (18), wobei das poröse Verdampfermedium (18) an eine Oberfläche (24, 26) des Verdampfermediumträgers durch eine flächige Lötverbindung (30) angebunden ist.Evaporator assembly, in particular for an evaporator burner of a vehicle heater, comprising a pot-like evaporator medium carrier (12) and a porous evaporator medium (18), wherein the porous evaporator medium (18) to a surface (24, 26) of the evaporator medium carrier by a flat solder joint (30) is connected , Verdampferbaugruppe nach Anspruch 1,
dadurch gekennzeichnet, dass der Verdampfermediumträger (12) mit einer Bodenwandung (14) und einer Umfangswandung (16) ausgebildet ist und dass die flächige Lötverbindung (30) im Wesentlichen den gesamten Angrenzungsbereich des porösen Verdampfermediums (18) an eine Oberfläche (24) der Bodenwandung (14) umfasst.Evaporator assembly according to claim 1,
characterized in that the evaporator medium carrier (12) having a bottom wall (14) and a peripheral wall (16) is formed and that the planar solder joint (30) substantially the entire abutment region of the porous evaporator medium (18) to a surface (24) of the bottom wall (14). Verdampferbaugruppe nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Verdampfermediumträger (12) mit einer Bodenwandung (14) und einer Umfangswandung (16) ausgebildet ist und dass die flächige Lötverbindung (30) im Wesentlichen den gesamten Angrenzungsbereich des porösen Verdampfermediums (18) an eine Oberfläche (26) der Umfangswandung (16) umfasst.Evaporator assembly according to claim 1 or 2,
characterized in that the evaporator medium carrier (12) having a bottom wall (14) and a peripheral wall (16) is formed and that the planar solder joint (30) substantially the entire abutment region of the porous evaporator medium (18) to a surface (26) of the peripheral wall (16). Verdampferbaugruppe nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Verdampfermediumträger (12) oder/und das poröse Verdampfermedium (18) aus Metallmaterial aufgebaut ist.Evaporator assembly according to one of claims 1 to 3,
characterized in that the evaporator medium carrier (12) and / or the porous evaporator medium (18) is constructed of metal material. Verdampferbaugruppe nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der topfartige Verdampfermediumträger (12) oder/und das poröse Verdampfermedium (18) im Wesentlichen aus nicht metallischem Material, vorzugsweise Keramikmaterial, aufgebaut ist.Evaporator assembly according to one of claims 1 to 3,
characterized in that the cup-like evaporator medium carrier (12) and / or the porous evaporator medium (18) consists essentially of non-metallic material, preferably ceramic material. Verfahren zur Herstellung einer Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgerätes, umfassend die Maßnahmen: a) Bereitstellen eines topfartigen Verdampfermediumträgers (12), b) Anordnen eines porösen Verdampfermediums (18) an dem Verdampfermediumträger (12), c) Herstellen einer flächigen Lötverbindung (30) zwischen dem porösen Verdampfermedium (18) und dem Verdampfermediumträger (12). Method for producing an evaporator assembly, in particular for an evaporator burner of a vehicle heater, comprising the measures: a) providing a pot-like evaporator medium carrier (12), b) arranging a porous evaporator medium (18) on the evaporator medium carrier (12), c) producing a flat solder connection (30) between the porous evaporator medium (18) and the evaporator medium carrier (12). Verfahren nach Anspruch 6,
dadurch gekennzeichnet, dass die Maßnahme c) das Anordnen von Lötmaterial an einer Oberfläche (24, 26) des Verdampfermediumträgers (12) und vor oder nach Durchführung der Maßnahme b) das Schmelzen des Lötmaterials umfasst.Method according to claim 6,
characterized in that the measure c) the placing of soldering material on a surface (24, 26) of the evaporator medium carrier (12) and before or after carrying out the measure b) comprises the melting of the soldering material. Verfahren nach Anspruch 6 oder 7,
dadurch gekennzeichnet, dass der Verdampfermediumträger (12) eine Bodenwandung (14) sowie eine Umfangswandung (16) umfasst und dass bei der Maßnahme c) eine flächige Lötverbindung (30) zwischen dem porösen Verdampfermedium (18) und einer Oberfläche (24) der Bodenwandung (14) im Wesentlichen im gesamten Angrenzungsbereich des porösen Verdampfermediums (18) an die Oberfläche (24) der Bodenwandung (16) hergestellt wird.Method according to claim 6 or 7,
characterized in that the evaporator medium carrier (12) comprises a bottom wall (14) and a peripheral wall (16) and that in the measure c) a flat solder joint (30) between the porous evaporator medium (18) and a surface (24) of the bottom wall ( 14) is produced on the surface (24) of the bottom wall (16) substantially in the entire abutment region of the porous evaporator medium (18). Verfahren nach einem der Ansprüche 6 bis 8,
dadurch gekennzeichnet, dass der Verdampfermediumträger (12) eine Bodenwandung (14) sowie eine Umfangswandung (16) umfasst und dass bei der Maßnahme c) eine flächige Lötverbindung (30) zwischen dem porösen Verdampfermedium (18) und einer Oberfläche (26) der Umfangswandung (16) im Wesentlichen im gesamten Angrenzungsbereich des porösen Verdampfermediums (18) an die Oberfläche (26) der Umfangswandung (16) hergestellt wird.Method according to one of claims 6 to 8,
characterized in that the evaporator medium carrier (12) comprises a bottom wall (14) and a peripheral wall (16) and that in the measure c) a flat solder joint (30) between the porous evaporator medium (18) and a surface (26) of the peripheral wall ( 16) substantially in the entire abutment region of the porous evaporator medium (18) to the surface (26) of Peripheral wall (16) is produced. Fahrzeugheizgerät, umfassend einen Verdampferbrenner mit einer Verdampferbaugruppe (10) nach einem der Ansprüche 1 bis 5, welche vorzugsweise mit einem Verfahren nach einem der Ansprüche 6 bis 9 hergestellt worden ist.A vehicle heater comprising an evaporative burner having an evaporator assembly (10) according to any one of claims 1 to 5, which has preferably been produced by a method according to any one of claims 6 to 9.
EP20080005168 2007-04-04 2008-03-19 Vaporiser component, in particular for a vaporiser burner of a vehicle heater Not-in-force EP1978302B1 (en)

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DE102009003363B4 (en) * 2009-01-20 2013-01-10 Webasto Ag Heater fiber evaporator
WO2011028188A1 (en) * 2009-09-07 2011-03-10 Stibranyi Ladislav Incineration concept of glycerine or glycerine mixtures and atmospheric vaporizer burner
WO2012155897A1 (en) * 2011-05-15 2012-11-22 Webasto Ag Evaporator system
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DE102016109369B4 (en) 2016-05-20 2023-09-07 Webasto SE Fuel evaporator assembly, fuel powered heater and method of manufacturing a fuel evaporator assembly

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EP1978302A3 (en) 2008-12-10
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