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EP2072898B1 - Combustion chamber assembly for an evaporation burner, especially for an automobil heating device and use in a heating device - Google Patents

Combustion chamber assembly for an evaporation burner, especially for an automobil heating device and use in a heating device Download PDF

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Publication number
EP2072898B1
EP2072898B1 EP08018651A EP08018651A EP2072898B1 EP 2072898 B1 EP2072898 B1 EP 2072898B1 EP 08018651 A EP08018651 A EP 08018651A EP 08018651 A EP08018651 A EP 08018651A EP 2072898 B1 EP2072898 B1 EP 2072898B1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
ignition element
evaporator medium
element receiving
porous evaporator
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.)
Not-in-force
Application number
EP08018651A
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German (de)
French (fr)
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EP2072898A1 (en
Inventor
Oliver Schmidt
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
Original Assignee
J Eberspaecher GmbH and Co KG
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Publication of EP2072898A1 publication Critical patent/EP2072898A1/en
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Publication of EP2072898B1 publication Critical patent/EP2072898B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/06—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners
    • F23Q7/08—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners for evaporating and igniting liquid fuel, e.g. in hurricane lanterns
    • 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 combustion chamber assembly for an evaporator burner, in particular for a vehicle heater, comprising a combustion chamber delimiting combustion chamber housing with at least one Zündorganamineransatz on a wall, wherein on an inner side of the Zündorganamsatzes a porous evaporator medium is provided and a fuel supply line for feeding liquid fuel into the porous evaporator medium opens into the Zündorganamble of the Ausprüchs first
  • combustion chamber assembly 10 includes a combustion chamber housing 12 which is formed with an example substantially circular cylindrical peripheral wall 14 and a bottom wall 16.
  • the bottom wall 16 may be integrally formed with the peripheral wall 14 and formed therewith to provide an integral combustor housing 12 in a manufacturing operation, generally using a casting process for manufacturing.
  • the substantially pot-shaped combustion chamber housing 12 defines a combustion chamber 18 with its peripheral wall 14 and its bottom wall 16.
  • a region is at the combustion chamber housing 12, namely here the peripheral wall 14, a Zündorganfactansatz 20 provided.
  • This lateral approach is approximately tangential to the peripheral wall 14 and is preferably integrally formed with this, so also forms an integral part of the metal-made combustor 12.
  • this approach 20 based on its longitudinal direction, for example, be designed substantially circular cylindrical.
  • a possibly provided on the bottom wall 16 combustion air inlet nozzle which may be formed approximately parallel to the peripheral wall 14 extending in a central region of the bottom wall 16 and projects into the combustion chamber 18 to feed combustion air into the combustion chamber 18 via a plurality of slot-like openings formed therein ,
  • a porous evaporator medium 22 is provided on the inside of the peripheral wall 14. This preferably lines the peripheral wall 14 in its entire circumferential area and approximately in the entire extension region of the combustion chamber 18. This porous evaporator medium 22 can receive liquid fuel, distribute it by Kapillarrant Angel in its internal volume range and then evaporate at the surface exposed to the combustion chamber 18 toward.
  • a porous evaporator medium 24 is provided, which is where the projection 20 in its first end portion 26 connects to the peripheral wall 14, in contact with the porous evaporator medium 22.
  • the approach 20 further opens a fuel supply 28, in a region in which the projection 20 is lined with the porous evaporator medium 24. Liquid fuel is thus fed via the line 28 into the batch 20 and there into the porous evaporator medium 24.
  • the evaporator medium 24 provides a Kapillar tone bin so that it on the one hand distributed from the line 28 liquid fuel in its interior volume range and thus distributed over the circumference of the projection 20, on the other hand, but also due to the connection to the porous evaporator medium 22 in the combustion chamber 18 fuel in this porous evaporator medium 22 initiates for further distribution therein and for evaporation in the combustion chamber 18th
  • the ignition element receiving projection 20 carries an ignition element 34 in its carrier region 32.
  • the carrier region 32 can extend into the ignition element receiving projection 20 or cover its front side, thus providing a stable holding by clamping action or optionally also threaded engagement of the ignition device 34 to obtain.
  • the ignition air required for starting the combustion in the region of such an ignition element receiving attachment 20 enters via at least one ignition air inlet opening 38 which is provided in the end region 30 or near the end region 30 in the ignition element receiving attachment 20.
  • This ignition air inlet opening 38 may be covered by the porous evaporator medium 24.
  • the porous evaporator medium 24 may also have a Zündluft tell trecsö réelle 40.
  • the resulting in combustion in the Zündorganingansatz 20 flame can then propagate through an opening 42 in the peripheral wall 14 into the combustion chamber 18 and ignite there also formed ignitable or combustible mixture.
  • a combustion chamber assembly for an evaporator burner in particular for a vehicle heater, according to claim 1.
  • This comprises a combustion chamber delimiting a combustion chamber housing with at least one Zündorganingansatz on a wall, wherein on an inner side of the Zündorganingansatzes a porous evaporator medium is provided and a Brennstoffzumoltechnisch for feeding liquid fuel into the porous evaporator medium into the Zündorganamsatz, wherein on the Zündorganingansatz an extending into this ignition device is worn.
  • the ignition element is carried on the porous evaporator medium on the Zündorganinganthesis.
  • the ignition element is no longer carried directly, but rather via the porous evaporator medium on the ignition element receiving approach, there is substantially no direct heat transfer contact between the ignition element and the ignition element receiving approach. Thus, no direct heat transfer can take place.
  • the porous evaporator medium basically represents a comparatively poor heat conductor with its pore structure, excessive heating of the Zündorganingansatzes, which leads to the risk of forming deposits, largely excluded.
  • the ignition device a Carrier portion, and that the support portion is carried on the porous evaporator medium on the Zündorganingansatz.
  • This carrier region can then be dimensioned and constructed of such material that, on the one hand, a stable holding functionality is ensured in the porous evaporator medium, on the other hand, a certain thermal insulation between the porous evaporator medium and that region of the ignition element is already present here, in which this constitutes the Ignition required high temperatures generated.
  • the carrier region extends into an end region of the ignition element receiving attachment which is remote from the peripheral wall and that the ignition device receiving attachment is lined at least in the end region with the porous evaporator medium over substantially its entire circumference.
  • the carrier region covers an end face of the porous evaporator medium at least partially.
  • At least one air inlet opening be provided in a region of the Zündorganingansatzes lined by the porous evaporator medium, which may be advantageously provided that at least one air passage opening in the porous evaporator medium is provided in association with the at least one air inlet opening in the Zündorganitsatz.
  • the present invention further relates to a heater, as it is preferable can be used in a vehicle as a heater or heater, with an evaporator burner having a combustion chamber assembly constructed according to the invention.
  • FIG. 2 the essential areas of a combustion chamber assembly 10 designed according to the invention are shown. It should be noted that, of course, in terms of its basic construction, this combustion chamber assembly 10 may be constructed as previously described with reference to FIGS Fig. 1 described.
  • this porous evaporator medium can be formed with basically substantially cylindrical structure and can be constructed of nonwoven material, braid, foam ceramic, fabric material or the like and is generally referred to as a candle screen.
  • FIG. 2 the carrier region 32, wherein it should already be noted that right with respect to the longitudinal axis L and left with respect to the longitudinal axis L in Fig. 2 two different variants of this support portion 32 are shown.
  • An ignition region 44 is carried on the carrier region 32, which in its inner region has, for example, an incandescent filament or assemblies which heat up during electrical excitation, in which the volume region surrounding the ignition region 44 and surrounded by the porous evaporator medium 24 is primarily an ignitable one Mixture of combustion air and fuel vapor will be present to start the combustion.
  • the carrier region 32 is designed or dimensioned so that it can be pushed into the end region 30 of the Zündorganingansatzes 20, and indeed in the existing therein porous evaporator medium 24. Since this porous evaporator medium 24 is preferably cylindrical, so the Zündorganingansatz 20 at Its entire circumferential area around the longitudinal axis L around, it also surrounds the imported into the Zündorganingansatz 20 portion of the support portion 32 completely, so that it is held stable.
  • a certain oversizing of the carrier region 32 may be provided on its outer circumference with respect to the inner circumference of the porous evaporator medium 24, so that a certain interference fit or press-holding effect is achieved, taking into account the compressibility of the porous material of the evaporator medium 24.
  • the support region 32 which may also preferably be constructed of comparatively poorly thermally conductive material, such as ceramic or plastic material, is formed with a substantially cylindrical outer peripheral structure, ie without thickness variation, so that an end face 46 the porous evaporator medium 24 is exposed here.
  • the support portion 32 is formed with a step-like extension 48, which covers the end face 46 radially outward and in the circumferential direction and thus prevents the porous structure of the porous evaporator medium 24 is axially open here and therefore an additional entry of air can take place or no unwanted evaporation of fuels can be done to the outside.
  • This step-like widening 48 is formed such that it extends maximally to the outer circumference of the porous evaporator medium 24, that is to say essentially likewise has no direct contact with the Zündorganeauansatz constructed generally of metal material.
  • a wall 50 which surrounds the combustion chamber assembly 10 and thus defines a generally designated 52 Plenumshunt through which the in the combustion chamber 18 and in the or Zündorgan techniquean accounts 20 air to be introduced is promoted.
  • the air conveyed by a heated air blower can then flow toward a heat exchanger area, not shown here, of a heater equipped with such a combustion chamber assembly 10.
  • the line 36 over which the Igniter 34 can be electrically excited, passes through an opening 54 in the wall 50 and is sealed by a flexible insert 58, for example made of rubbery material, on the one hand with respect to the wall 50 and on the other hand supported, so that due to the basically defined positioning of the wall 50 with respect the Zündorganingansatz 20 an additional support effect for the ignition device 34 can be achieved and in particular this can be secured against pulling out of the Zündorganingansatz 20.
  • a flexible insert 58 for example made of rubbery material
  • the inventive holder of an ignition device on a Zündorganoramsatz with the significantly limited heat transfer to the Zündorganoritsatz with nevertheless stable support the risk of the formation of deposits in the Zündorganingansatzes and in particular in the region of the openings through which the ignition air flows, can be prevented.
  • a plurality of such Zündorganfactanticiane can be provided on a peripheral wall 14 of a combustion chamber assembly 10, which can of course also be arranged with a substantially radial extent.

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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)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The assembly (10) has combustion chamber housing defining a combustion chamber and including an ignition part retaining projection (20) at a wall such that a cylindrical shaped porous evaporation medium (24) is provided at an inner side of the projection and a fuel supply line (28) for supplying liquid fuel into the evaporation medium discharges into the projection. An ignition part (34) includes a support region (32), which is supported at the projection above the evaporation medium. The ignition part is extended through the evaporation medium.

Description

Die vorliegende Erfindung betrifft eine Brennkammerbaugruppe für einen Verdampferbrenner, insbesondere für ein Fahrzeugheizgerät, umfassend ein eine Brennkammer begrenzendes Brennkammergehäuse mit wenigstens einem Zündorganaufnahmeansatz an einer Wandung, wobei an einer Innenseite des Zündorganaufnahmeansatzes ein poröses Verdampfermedium vorgesehen ist und eine Brennstoffzuführleitung zum Einspeisen von flüssigem Brennstoff in das poröse Verdampfermedium in den Zündorganaufnahmeansatz einmündet, wobei an dem Zündorganaufnahmeansatz ein sich in diesen hineinerstreckendes Zündorgan getragen ist, gemäß dem oberbegriff des Ausprüchs 1.The present invention relates to a combustion chamber assembly for an evaporator burner, in particular for a vehicle heater, comprising a combustion chamber delimiting combustion chamber housing with at least one Zündorganaufnahmeansatz on a wall, wherein on an inner side of the Zündorganaufnahmeansatzes a porous evaporator medium is provided and a fuel supply line for feeding liquid fuel into the porous evaporator medium opens into the Zündorganaufnahmeansatz, wherein on the Zündorganaufnahmeansatz a hineinerstreckendes in this ignition is carried, according to the preamble of the Ausprüchs first

Eine derartige aus der EP-A-1788305 bekannte Brennkammerbaugruppe wird nachfolgend mit Bezug auf die Fig. 1 hinsichtlich ihres prinzipiellen Aufbaus beschrieben.Such from the EP-A-1788305 The known combustor assembly will be described below with reference to FIGS Fig. 1 described in terms of their basic structure.

Diese im Querschnitt dargestellte Brennkammerbaugruppe 10 umfasst ein Brennkammergehäuse 12, das mit einer beispielsweise im Wesentlichen kreiszylindrischen Umfangswandung 14 und einer Bodenwandung 16 ausgebildet ist. Die Bodenwandung 16 kann mit der Umfangswandung 14 integral ausgebildet sein und mit dieser zusammen zum Bereitstellen eines integralen Brennkammergehäuses 12 in einem Fertigungsvorgang hergestellt werden, wobei hier im Allgemeinen ein Gussvorgang zur Herstellung verwendet wird. Das im Wesentlichen topfartige Brennkammergehäuse 12 begrenzt mit seiner Umfangswandung 14 und seiner Bodenwandung 16 eine Brennkammer 18.This illustrated in cross-section combustion chamber assembly 10 includes a combustion chamber housing 12 which is formed with an example substantially circular cylindrical peripheral wall 14 and a bottom wall 16. The bottom wall 16 may be integrally formed with the peripheral wall 14 and formed therewith to provide an integral combustor housing 12 in a manufacturing operation, generally using a casting process for manufacturing. The substantially pot-shaped combustion chamber housing 12 defines a combustion chamber 18 with its peripheral wall 14 and its bottom wall 16.

In einem vorzugsweise der Bodenwandung 16 nahe liegenden Bereich ist am Brennkammergehäuse 12, nämlich hier der Umfangswandung 14, ein Zündorganaufnahmeansatz 20 vorgesehen. Dieser seitliche Ansatz liegt näherungsweise tangential zur Umfangswandung 14 und ist mit dieser vorzugsweise ebenfalls integral ausgebildet, bildet also auch einen integralen Bestandteil des aus Metall gefertigten Brennkammergehäuses 12. Auch dieser Ansatz 20 kann, bezogen auf seine Längsrichtung, beispielsweise im Wesentlichen kreiszylindrisch ausgestaltet sein. Nicht dargestellt ist ein an der Bodenwandung 16 möglicherweise vorzusehender Verbrennungslufteinlassstutzen, der in einem zentralen Bereich der Bodenwandung 16 sich näherungsweise parallel zur Umfangswandung 14 erstreckend ausgebildet sein kann und in die Brennkammer 18 ragt, um über mehrere darin ausgebildete schlitzartige Öffnungen Verbrennungsluft in die Brennkammer 18 einzuspeisen.In a region preferably lying close to the bottom wall 16, a region is at the combustion chamber housing 12, namely here the peripheral wall 14, a Zündorganaufnahmeansatz 20 provided. This lateral approach is approximately tangential to the peripheral wall 14 and is preferably integrally formed with this, so also forms an integral part of the metal-made combustor 12. Also, this approach 20, based on its longitudinal direction, for example, be designed substantially circular cylindrical. Not shown is a possibly provided on the bottom wall 16 combustion air inlet nozzle, which may be formed approximately parallel to the peripheral wall 14 extending in a central region of the bottom wall 16 and projects into the combustion chamber 18 to feed combustion air into the combustion chamber 18 via a plurality of slot-like openings formed therein ,

An der Innenseite der Umfangswandung 14 ist ein poröses Verdampfermedium 22 vorgesehen. Dieses kleidet vorzugsweise die Umfangswandung 14 in ihrem gesamten Umfangsbereich und näherungsweise im gesamten Erstreckungsbereich der Brennkammer 18 aus. Dieses poröse Verdampfermedium 22 kann flüssigen Brennstoff aufnehmen, ihn durch Kapillarförderwirkung in seinem Innenvolumenbereich verteilen und dann an der zur Brennkammer 18 hin frei liegenden Oberfläche abdampfen.On the inside of the peripheral wall 14, a porous evaporator medium 22 is provided. This preferably lines the peripheral wall 14 in its entire circumferential area and approximately in the entire extension region of the combustion chamber 18. This porous evaporator medium 22 can receive liquid fuel, distribute it by Kapillarförderwirkung in its internal volume range and then evaporate at the surface exposed to the combustion chamber 18 toward.

Auch an der Innenseite des Zündorganaufnahmeansatzes 20 ist ein poröses Verdampfermedium 24 vorgesehen, das dort, wo der Ansatz 20 in seinem ersten Endbereich 26 an die Umfangswandung 14 anschließt, auch in Kontakt mit dem porösen Verdampfermedium 22 steht. In den Ansatz 20 mündet ferner eine Brennstoffzuführleitung 28 ein, und zwar in einem Bereich, in welchem der Ansatz 20 mit dem porösen Verdampfermedium 24 ausgekleidet ist. Flüssiger Brennstoff wird über die Leitung 28 also in den Ansatz 20 und dort in das poröse Verdampfermedium 24 eingespeist. Auch das Verdampfermedium 24 stellt einen Kapillarfördereffekt bereit, so dass es einerseits den von der Leitung 28 aufgenommenen flüssigen Brennstoff in seinem Innenvolumenbereich und somit über den Umfang des Ansatzes 20 verteilt, andererseits aber auch aufgrund der Anbindung an das poröse Verdampfermedium 22 in der Brennkammer 18 Brennstoff in dieses poröse Verdampfermedium 22 einleitet zur weiteren Verteilung darin und zur Abdampfung in die Brennkammer 18.Also on the inside of the Zündorganaufnahmeansatzes 20, a porous evaporator medium 24 is provided, which is where the projection 20 in its first end portion 26 connects to the peripheral wall 14, in contact with the porous evaporator medium 22. In the approach 20 further opens a fuel supply 28, in a region in which the projection 20 is lined with the porous evaporator medium 24. Liquid fuel is thus fed via the line 28 into the batch 20 and there into the porous evaporator medium 24. Also, the evaporator medium 24 provides a Kapillarfördereffekt so that it on the one hand distributed from the line 28 liquid fuel in its interior volume range and thus distributed over the circumference of the projection 20, on the other hand, but also due to the connection to the porous evaporator medium 22 in the combustion chamber 18 fuel in this porous evaporator medium 22 initiates for further distribution therein and for evaporation in the combustion chamber 18th

An dem von der Umfangswandung 14 entfernten Endbereich 30 trägt der Zündorganaufnahmeansatz 20 ein Zündorgan 34 in dessen Trägerbereich 32. Dabei kann der Trägerbereich 32 sich in den Zündorganaufnahmeansatz 20 hineinerstrecken bzw. dessen Stirnseite überdecken, um somit durch Klemmwirkung oder ggf. auch Gewindeeingriff eine stabile Halterung des Zündorgans 34 zu erlangen.At the end region 30 remote from the circumferential wall 14, the ignition element receiving projection 20 carries an ignition element 34 in its carrier region 32. The carrier region 32 can extend into the ignition element receiving projection 20 or cover its front side, thus providing a stable holding by clamping action or optionally also threaded engagement of the ignition device 34 to obtain.

Die zum Starten der Verbrennung im Bereich eines derartigen Zündorganaufnahmeansatzes 20 erforderliche Zündluft tritt über zumindest eine Zündlufteintrittsöffnung 38 ein, die im Endbereich 30 oder nahe dem Endbereich 30 im Zündorganaufnahmeansatz 20 vorgesehen ist. Diese Zündlufteintrittsöffnung 38 kann von dem porösen Verdampfermedium 24 überdeckt sein. In Zuordnung zu dieser Zündlufteintrittsöffnung 38 kann das poröse Verdampfermedium 24 jedoch auch eine Zündluftdurchtrittsöffnung 40 aufweisen. Die bei Verbrennung in dem Zündorganaufnahmeansatz 20 entstehende Flamme kann sich dann durch eine Öffnung 42 in der Umfangswandung 14 in die Brennkammer 18 ausbreiten und das dort ebenfalls gebildete zünd- bzw. verbrennungsfähige Gemisch zünden.The ignition air required for starting the combustion in the region of such an ignition element receiving attachment 20 enters via at least one ignition air inlet opening 38 which is provided in the end region 30 or near the end region 30 in the ignition element receiving attachment 20. This ignition air inlet opening 38 may be covered by the porous evaporator medium 24. In association with this Zündlufteintrittsöffnung 38, however, the porous evaporator medium 24 may also have a Zündluftdurchtrittsöffnung 40. The resulting in combustion in the Zündorganaufnahmeansatz 20 flame can then propagate through an opening 42 in the peripheral wall 14 into the combustion chamber 18 and ignite there also formed ignitable or combustible mixture.

Ein Problem derartiger Brennkammerbaugruppen ist, dass durch die im Bereich des Zündorgans bei dessen elektrischer Erregung erzeugten hohen Temperaturen auch der den Trägerbereich tragende Endbereich des Zündorganaufnahmeansatzes vergleichsweise stark erwärmt wird. Da in diesem Endbereich auch die Zündlufteintrittsöffnung vorgesehen ist, besteht durch diese Erwärmung die Gefahr, dass im Bereich dieser Öffnung sich feste Ablagerungen bilden, welche über die Betriebslebensdauer hinweg den zum Durchströmen freien Querschnitt der Zündlufteintrittsöffnung zunehmend einschnüren. Die Folge davon ist, dass insbesondere in der Startphase im Bereich eines derartigen Zündorganaufnahmeansatzes eine Sauerstoffunterversorgung vorhanden ist und somit ein zuverlässiges Zünden nicht mehr sichergestellt werden kann.A problem of such combustion chamber assemblies is that the end region of the Zündorganaufnahmeansatzes carrying the carrier region is heated comparatively strong by the high temperatures generated in the region of the ignition element at its electrical excitation. Since the Zündlufteintrittsöffnung is provided in this end, there is the risk that in the region of this opening solid deposits form, which constrict increasingly over the service life of the flow-through free cross section of the Zündlufteintrittsöffnung by this heating. The consequence of this is that, especially in the starting phase in the field of such Zündorganaufnahmeansatzes an oxygen deficiency is present and thus a reliable ignition can not be guaranteed.

Es ist die Aufgabe der vorliegenden Erfindung, eine Brennkammerbaugruppe für einen Verdampferbrenner derart auszugestalten, dass über die Betriebslebensdauer hinweg eine zuverlässige Zündfunktion sichergestellt werden kann.It is the object of the present invention to design a combustion chamber assembly for an evaporator burner such that a reliable ignition function can be ensured over the service life.

Erfindungsgemäß wird diese Aufgabe gelöst durch eine Brennkammerbaugruppe für einen Verdampferbrenner, insbesondere für ein Fahrzeugheizgerät, gemäß Anspruch 1. Diese umfasst ein eine Brennkammer begrenzendes Brennkammergehäuse mit wenigstens einem Zündorganaufnahmeansatz an einer Wandung, wobei an einer Innenseite des Zündorganaufnahmeansatzes ein poröses Verdampfermedium vorgesehen ist und eine Brennstoffzuführleitung zum Einspeisen von flüssigem Brennstoff in das poröse Verdampfermedium in den Zündorganaufnahmeansatz einmündet, wobei an dem Zündorganaufnahmeansatz ein sich in diesen hineinerstreckendes Zündorgan getragen ist.According to the invention, this object is achieved by a combustion chamber assembly for an evaporator burner, in particular for a vehicle heater, according to claim 1. This comprises a combustion chamber delimiting a combustion chamber housing with at least one Zündorganaufnahmeansatz on a wall, wherein on an inner side of the Zündorganaufnahmeansatzes a porous evaporator medium is provided and a Brennstoffzuführleitung for feeding liquid fuel into the porous evaporator medium into the Zündorganaufnahmeansatz, wherein on the Zündorganaufnahmeansatz an extending into this ignition device is worn.

Dabei ist weiter vorgesehen, dass das Zündorgan über das poröse Verdampfermedium an dem Zündorganaufnahmeansatz getragen ist.It is further provided that the ignition element is carried on the porous evaporator medium on the Zündorganaufnahmeansatz.

Da bei dem erfindungsgemäßen Aufbau das Zündorgan nicht mehr direkt, sondern über das poröse Verdampfermedium am Zündorganaufnahmeansatz getragen ist, besteht im Wesentlichen kein unmittelbarer Wärmeübertragungskontakt zwischen dem Zündorgan und dem Zündorganaufnahmeansatz. Somit kann auch keine direkte Wärmeübertragung stattfinden. Da das poröse Verdampfermedium grundsätzlich mit seiner Porenstruktur einen vergleichsweise schlechten Wärmeleiter darstellt, wird eine übermäßige Erwärmung des Zündorganaufnahmeansatzes, die zur Gefahr des Bildens von Ablagerungen führt, weitgehend ausgeschlossen.Since, in the structure according to the invention, the ignition element is no longer carried directly, but rather via the porous evaporator medium on the ignition element receiving approach, there is substantially no direct heat transfer contact between the ignition element and the ignition element receiving approach. Thus, no direct heat transfer can take place. Since the porous evaporator medium basically represents a comparatively poor heat conductor with its pore structure, excessive heating of the Zündorganaufnahmeansatzes, which leads to the risk of forming deposits, largely excluded.

Beispielsweise kann vorgesehen sein, dass das Zündorgan einen Trägerbereich aufweist, und dass der Trägerbereich über das poröse Verdampfermedium an dem Zündorganaufnahmeansatz getragen ist. Dieser Trägerbereich kann dann so dimensioniert und aus derartigem Material aufgebaut sein, dass einerseits auch in dem porösen Verdampfermedium eine stabile Halterungsfunktionalität sichergestellt wird, andererseits bereits hier eine gewisse thermische Isolation zwischen dem porösen Verdampfermedium und demjenigen Bereich des Zündorgans vorhaden ist, in welchem dieses die zum Zünden erforderlichen hohen Temperaturen erzeugt.For example, it can be provided that the ignition device a Carrier portion, and that the support portion is carried on the porous evaporator medium on the Zündorganaufnahmeansatz. This carrier region can then be dimensioned and constructed of such material that, on the one hand, a stable holding functionality is ensured in the porous evaporator medium, on the other hand, a certain thermal insulation between the porous evaporator medium and that region of the ignition element is already present here, in which this constitutes the Ignition required high temperatures generated.

Weiterhin kann vorgesehen sein, dass der Trägerbereich sich in einen von der Umfangswandung entfernten Endbereich des Zündorganaufnahmeansatzes erstreckt und dass wenigstens in dem Endbereich der Zündorganaufnahmeansatz im Wesentlichen über seinen gesamten Umfang mit dem porösen Verdampfermedium ausgekleidet ist.Furthermore, it can be provided that the carrier region extends into an end region of the ignition element receiving attachment which is remote from the peripheral wall and that the ignition device receiving attachment is lined at least in the end region with the porous evaporator medium over substantially its entire circumference.

Um sicherzustellen, dass Zündluft im Wesentlichen nur über die dafür definiert vorgesehenen Öffnungen in den Zündorganaufnahmeansatz gelangt, wird weiter vorgeschlagen, dass der Trägerbereich eine Stirnfläche des porösen Verdampfermediums wenigstens bereichsweise überdeckt.To ensure that ignition air passes essentially only via the openings provided for this purpose in the Zündorganaufnahmeansatz, it is further proposed that the carrier region covers an end face of the porous evaporator medium at least partially.

Wie vorangehend bereits dargestellt, ist es von besonderem Vorteil, wenn das Zündorgan nicht in Kontakt mit dem Zündorganaufnahmeansatz ist.As already stated above, it is particularly advantageous if the ignition element is not in contact with the Zündorganaufnahmeansatz.

Weiterhin wird vorgeschlagen, dass in einem von dem porösen Verdampfermedium ausgekleideten Bereich des Zündorganaufnahmeansatzes wenigstens eine Lufteintrittsöffnung vorgesehen ist, wobei vorteilhafterweise dann vorgesehen sein kann, dass in Zuordnung zu der wenigstens einen Lufteintrittsöffnung in dem Zündorganaufnahmeansatz wenigstens eine Luftdurchtrittsöffnung in dem porösen Verdampfermedium vorgesehen ist.Furthermore, it is proposed that at least one air inlet opening be provided in a region of the Zündorganaufnahmeansatzes lined by the porous evaporator medium, which may be advantageously provided that at least one air passage opening in the porous evaporator medium is provided in association with the at least one air inlet opening in the Zündorganaufnahmeansatz.

Die vorliegende Erfindung betrifft ferner ein Heizgerät, wie es vorzugsweise in einem Fahrzeug als Standheizung oder Zuheizer eingesetzt werden kann, mit einem Verdampferbrenner, der eine erfindungsgemäß aufgebaute Brennkammerbaugruppe aufweist.The present invention further relates to a heater, as it is preferable can be used in a vehicle as a heater or heater, with an evaporator burner having a combustion chamber assembly constructed according to the invention.

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

Fig. 1
eine Querschnittansicht einer aus dem Stand der Technik bekannten Verdampferbaugruppe;
Fig. 2
eine Schnittansicht einer erfindungsgemäß aufgebauten Brenn- kammerbaugruppe im Bereich eines Zündorganaufnahme- ansatzes.
The present invention will be described below in detail with reference to the accompanying drawings. It shows:
Fig. 1
a cross-sectional view of an evaporator assembly known from the prior art;
Fig. 2
a sectional view of a inventively constructed combustion chamber assembly in the range of Zündorganaufnahme- approach.

In Fig. 2 sind die wesentlichen Bereiche einer erfindungsgemäß ausgestalteten Brennkammerbaugruppe 10 gezeigt. Es sei darauf hingewiesen, dass selbstverständlich hinsichtlich ihres grundsätzlichen Aufbaus diese Brennkammerbaugruppe 10 so aufgebaut sein kann, wie vorangehend mit Bezug auf die Fig. 1 beschrieben.In Fig. 2 the essential areas of a combustion chamber assembly 10 designed according to the invention are shown. It should be noted that, of course, in terms of its basic construction, this combustion chamber assembly 10 may be constructed as previously described with reference to FIGS Fig. 1 described.

Man erkennt in Fig. 2 den Zündorganaufnahmeansatz 20, der in oder nahe seinem Endbereich 30 mit Zündlufteintrittsöffnungen 38 und in Zuordnung dazu Zündluftdurchtrittsöffnungen 40 im porösen Verdampfermedium 24 aufweist. Es sei darauf hingewiesen, dass dieses poröse Verdampfermedium mit grundsätzlich im Wesentlichen zylindrischer Struktur ausgebildet sein kann und aus Vliesmaterial, Geflecht, Schaumkeramik, Gewebematerial oder dergleichen aufgebaut sein kann und im Allgemeinen als Kerzensieb bezeichnet wird. Es sei weiterhin noch einmal betont, dass die Anzahl der Zündlufteintrittsöffnungen 38 entsprechend den auftretenden Anforderungen gewählt werden kann und auch deren Lage über den Umfang bzw. in Richtung der Längsachse L des Zündorganaufnahmeansatzes variiert werden kann, ebenso wie deren Größe und die Größe und Anzahl der zugeordneten Zündluftdurchtrittsöffnungen 40.One recognizes in Fig. 2 the Zündorganaufnahmeansatz 20, which in or near its end portion 30 with Zündlufteintrittsöffnungen 38 and in association with Zündluftdurchtrittsöffnungen 40 in the porous evaporator medium 24 has. It should be noted that this porous evaporator medium can be formed with basically substantially cylindrical structure and can be constructed of nonwoven material, braid, foam ceramic, fabric material or the like and is generally referred to as a candle screen. It should also be emphasized once again that the number of Zündlufteintrittsöffnungen 38 can be selected according to the requirements occurring and also their position over the circumference or in the direction of the longitudinal axis L of the Zündorganaufnahmeansatzes can be varied, as well as their size and the size and number of associated Zündluftdurchtrittsöffnungen 40th

Man erkennt in Fig. 2 den Trägerbereich 32, wobei bereits hier darauf hingewiesen sei, dass rechts bezüglich der Längsachse L und links bezüglich der Längsachse L in Fig. 2 zwei verschiedene Varianten dieses Trägerbereichs 32 dargestellt sind. An dem Trägerbereich 32 ist ein Zündbereich 44 getragen, der in seinem Innenbereich beispielsweise eine Glühwendel oder mehrere Glühwendeln oder bei elektrischer Erregung sich erwärmende Baugruppen aufweist, um in dem den Zündbereich 44 umgebenden und von dem porösen Verdampfermedium 24 umgebenen Volumenbereich, in welchem primär ein zündfähiges Gemisch aus Verbrennungsluft und Brennstoffdampf vorhanden sein wird, die Verbrennung zu starten.One recognizes in Fig. 2 the carrier region 32, wherein it should already be noted that right with respect to the longitudinal axis L and left with respect to the longitudinal axis L in Fig. 2 two different variants of this support portion 32 are shown. An ignition region 44 is carried on the carrier region 32, which in its inner region has, for example, an incandescent filament or assemblies which heat up during electrical excitation, in which the volume region surrounding the ignition region 44 and surrounded by the porous evaporator medium 24 is primarily an ignitable one Mixture of combustion air and fuel vapor will be present to start the combustion.

Der Trägerbereich 32 ist so ausgebildet bzw. dimensioniert, dass er grundsätzlich in den Endbereich 30 des Zündorganaufnahmeansatzes 20 eingeschoben werden kann, und zwar auch in das dort vorhandene poröse Verdampfermedium 24. Da dieses poröse Verdampfermedium 24 vorzugsweise zylinderartig ausgebildet ist, also den Zündorganaufnahmeansatz 20 an seinem ganzen Umfangsbereich um die Längsachse L herum auskleidet, umgibt es auch den in den Zündorganaufnahmeansatz 20 eingeführten Abschnitt des Trägerbereichs 32 vollständig, so dass dieser stabil gehalten ist. Hier kann beispielsweise eine gewisse Überdimensionierung des Trägerbereichs 32 an seinem Außenumfang bezüglich des Innenumfangs des porösen Verdampfermediums 24 vorgesehen sein, so dass unter Berücksichtigung der Kompressibilität des porösen Materials des Verdampfermediums 24 hier eine gewisse Presspassung bzw. Presshalterungswirkung erzielt wird.The carrier region 32 is designed or dimensioned so that it can be pushed into the end region 30 of the Zündorganaufnahmeansatzes 20, and indeed in the existing therein porous evaporator medium 24. Since this porous evaporator medium 24 is preferably cylindrical, so the Zündorganaufnahmeansatz 20 at Its entire circumferential area around the longitudinal axis L around, it also surrounds the imported into the Zündorganaufnahmeansatz 20 portion of the support portion 32 completely, so that it is held stable. Here, for example, a certain oversizing of the carrier region 32 may be provided on its outer circumference with respect to the inner circumference of the porous evaporator medium 24, so that a certain interference fit or press-holding effect is achieved, taking into account the compressibility of the porous material of the evaporator medium 24.

Mit derartiger Ausgestaltung wird erreicht, dass kein direkter Kontakt zwischen dem Trägerbereich 32 und dem Zündorganaufnahmeansatz 20 besteht. Dies bedeutet, dass bei Erregung und Wärmeerzeugung im Bereich des Zündbereichs 44 der Wärmeübertrag in den Trägerbereich 32 und von diesem in den Zündorganaufnahmeansatz 20 deutlich reduziert wird, da der Wärmefluss über das poröse Verdampfermedium 24 erfolgen muss. Auf Grund der porösen Struktur desselben ist es ein vergleichsweise schlechter Wärmeleiter, so dass eine übermäßige und die Gefahr von Ablagerungen im Bereich der Öffnungen 38, 40 mit sich bringende Erwärmung nicht auftreten wird.With such a configuration it is achieved that there is no direct contact between the carrier region 32 and the Zündorganaufnahmeansatz 20. This means that upon excitation and heat generation in the region of the ignition region 44, the heat transfer into the carrier region 32 and from there into the Zündorganaufnahmeansatz 20 is significantly reduced, as the Heat flow must occur via the porous evaporator medium 24. Due to the porous structure of the same, it is a comparatively poor heat conductor, so that an excessive and the risk of deposits in the region of the openings 38, 40 bringing about heating will not occur.

In der linken Hälfte der Fig. 2 ist eine Variante gezeigt, in welcher der Trägerbereich 32, der vorzugsweise ebenfalls aus vergleichsweise schlecht thermisch leitendem Material, wie zum Beispiel Keramik oder Kunststoffmaterial, aufgebaut sein kann, mit im Wesentlichen zylindrischer Außenumfangsstruktur, also ohne Dickenvariation, ausgebildet ist, so dass eine Stirnfläche 46 des porösen Verdampfermediums 24 hier freiliegt. In der rechten Hälfte der Fig. 2 ist der Trägerbereich 32 mit einer stufenartigen Erweiterung 48 ausgebildet, welche die Stirnfläche 46 nach radial außen hin und in Umfangsrichtung überdeckt und somit verhindert, dass die poröse Struktur des porösen Verdampfermediums 24 hier axial offen ist und daher ein zusätzlicher Eintritt von Luft stattfinden kann bzw. kein ungewünschtes Verdampfen von Brennstoffen nach außen erfolgen kann. Diese stufenartige Erweiterung 48 ist dabei so gebildet, dass sie sich maximal bis zum Außenumfang des porösen Verdampfermediums 24 erstreckt, also im Wesentlichen ebenfalls keinen unmittelbaren Kontakt zu dem im Allgemeinen aus Metallmaterial aufgebauten Zündorganaufnahmeansatz aufweist.In the left half of the Fig. 2 a variant is shown, in which the support region 32, which may also preferably be constructed of comparatively poorly thermally conductive material, such as ceramic or plastic material, is formed with a substantially cylindrical outer peripheral structure, ie without thickness variation, so that an end face 46 the porous evaporator medium 24 is exposed here. In the right half of the Fig. 2 the support portion 32 is formed with a step-like extension 48, which covers the end face 46 radially outward and in the circumferential direction and thus prevents the porous structure of the porous evaporator medium 24 is axially open here and therefore an additional entry of air can take place or no unwanted evaporation of fuels can be done to the outside. This step-like widening 48 is formed such that it extends maximally to the outer circumference of the porous evaporator medium 24, that is to say essentially likewise has no direct contact with the Zündorganaufnahmeansatz constructed generally of metal material.

Man erkennt in Fig. 2 ferner den Abschnitt einer Wandung 50, welche die Brennkammerbaugruppe 10 umgibt und somit eine allgemein mit 52 bezeichnete Plenumskammer begrenzt, durch welche hindurch die in die Brennkammer 18 bzw. in den oder die Zündorganaufnahmeansätze 20 einzuleitende Luft herangefördert wird. Außerhalb dieser Wandung 50, in der Fig. 2 also über dieser Wandung, kann die durch ein Heizluftgebläse geförderte Luft dann in Richtung zu einem hier nicht gezeigten Wärmetauscherbereich eines mit einer derartigen Brennkammerbaugruppe 10 ausgestatteten Heizgeräts strömen. Die Leitung 36, über welche das Zündorgan 34 elektrisch erregt werden kann, durchsetzt eine Öffnung 54 in der Wandung 50 und ist durch eine flexible Einlage 58, beispielsweise aus gummiartigem Material, einerseits bezüglich der Wandung 50 abgedichtet und andererseits gehaltert, so dass auf Grund der grundsätzlich definierten Positionierung der Wandung 50 bezüglich des Zündorganaufnahmeansatz 20 eine zusätzliche Halterungswirkung für das Zündorgan 34 erreicht werden kann und insbesondere dieses gegen Herausziehen aus dem Zündorganaufnahmeansatz 20 gesichert werden kann.One recognizes in Fig. 2 Further, the portion of a wall 50 which surrounds the combustion chamber assembly 10 and thus defines a generally designated 52 Plenumskammer through which the in the combustion chamber 18 and in the or Zündorganaufnahmeansätze 20 air to be introduced is promoted. Outside this wall 50, in the Fig. 2 that is, above this wall, the air conveyed by a heated air blower can then flow toward a heat exchanger area, not shown here, of a heater equipped with such a combustion chamber assembly 10. The line 36, over which the Igniter 34 can be electrically excited, passes through an opening 54 in the wall 50 and is sealed by a flexible insert 58, for example made of rubbery material, on the one hand with respect to the wall 50 and on the other hand supported, so that due to the basically defined positioning of the wall 50 with respect the Zündorganaufnahmeansatz 20 an additional support effect for the ignition device 34 can be achieved and in particular this can be secured against pulling out of the Zündorganaufnahmeansatz 20.

Durch die erfindungsgemäße Halterung eines Zündorgans an einem Zündorganaufnahmeansatz wird mit dem deutlich beschränkten Wärmeübertrag auf den Zündorganaufnahmeansatz bei gleichwohl stabiler Halterung die Gefahr des Entstehens von Ablagerungen im Bereich des Zündorganaufnahmeansatzes und insbesondere im Bereich der Öffnungen, über welche die Zündluft einströmt, verhindert werden.The inventive holder of an ignition device on a Zündorganaufnahmeansatz with the significantly limited heat transfer to the Zündorganaufnahmeansatz with nevertheless stable support the risk of the formation of deposits in the Zündorganaufnahmeansatzes and in particular in the region of the openings through which the ignition air flows, can be prevented.

Es können selbstverständlich an einer Umfangswandung 14 einer Brennkammerbaugruppe 10 mehrere derartige Zündorganaufnahmeansätze vorgesehen sein, die selbstverständlich auch mit im Wesentlichen radialer Erstreckung angeordnet sein können.Of course, a plurality of such Zündorganaufnahmeanätze can be provided on a peripheral wall 14 of a combustion chamber assembly 10, which can of course also be arranged with a substantially radial extent.

Claims (7)

  1. A combustion chamber assembly for an evaporation burner, in particular for a vehicle heating device, comprising a combustion chamber housing (12) defining a combustion chamber (18) with at least one ignition element receiving projection (20) at its circumferential wall (14), the ignition element receiving projection opening towards the combustion chamber (18) via an opening (42) in the circumferential wall (14) at its end region (26) near the circumferential wall (14), and a porous evaporator medium (24) being provided at an inner side of the ignition element receiving projection (20) and a fuel supply line (28) for feeding liquid fuel into the porous evaporator medium (24) leading into the ignition element receiving projection (20), an ignition element (34), extending into the ignition element receiving projection (20), being carried at the ignition element receiving projection (20) in its end region opposite the circumferential wall (14),
    characterized by
    the ignition element (34) being carried at the ignition element receiving projection (20) via the porous evaporator medium (24).
  2. A combustion chamber assembly according to claim 1, characterized by the ignition element (34) comprising a carrier section (32) and by the carrier section (32) being carried at the ignition element receiving projection (20) via the porous evaporator medium (24).
  3. A combustion chamber assembly according to claim 2, characterized by the carrier section (32) extending into an end section (30) of the ignition element receiving projection (20) opposite the circumferential wall (14) and by the ignition element receiving projection (20) being at least in its end section (30) coated by the porous evaporator medium (24), substantially over its whole circumference.
  4. A combustion chamber assembly according to claim 2 or 3, characterized by the carrier section (32) covering at least partly an end face of the porous evaporator medium (24).
  5. A combustion chamber assembly according to one of claims 1 to 4, characterized by at least one air inlet opening (38) being provided in a section of the ignition element receiving projection (20) coated with the porous evaporator medium (24).
  6. A combustion chamber assembly according to claim 5, characterized by at least one air passage opening (40) being provided in the porous evaporator medium (24) in association to the at least one air inlet opening (38) in the ignition element receiving projection (20).
  7. Heating device, in particular for a vehicle, comprising an evaporation burner with a combustion chamber assembly (10) according to one of the preceding claims.
EP08018651A 2007-12-20 2008-10-24 Combustion chamber assembly for an evaporation burner, especially for an automobil heating device and use in a heating device Not-in-force EP2072898B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007061518A DE102007061518A1 (en) 2007-12-20 2007-12-20 Combustion chamber assembly for an evaporator burner, in particular for a vehicle heater

Publications (2)

Publication Number Publication Date
EP2072898A1 EP2072898A1 (en) 2009-06-24
EP2072898B1 true EP2072898B1 (en) 2011-01-26

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EP08018651A Not-in-force EP2072898B1 (en) 2007-12-20 2008-10-24 Combustion chamber assembly for an evaporation burner, especially for an automobil heating device and use in a heating device

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EP (1) EP2072898B1 (en)
AT (1) ATE497129T1 (en)
DE (2) DE102007061518A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529994C2 (en) * 1994-11-10 2003-06-26 Eberspaecher J Gmbh & Co Evaporator burner for a heater
DE10004507A1 (en) * 2000-02-02 2001-08-09 Eberspaecher J Gmbh & Co Vehicle heating system operating independently of engine includes glow body fixed in pipe between burner chamber and fuel supply to vaporise and ignite fuel during start phase of heater
DE10209967C5 (en) * 2002-03-07 2009-01-29 J. Eberspächer GmbH & Co. KG Evaporator element for an evaporator burner
DE10219633C1 (en) * 2002-05-02 2003-12-04 Eberspaecher J Gmbh & Co evaporative burner
DE10343282B3 (en) * 2003-09-18 2005-04-21 J. Eberspächer GmbH & Co. KG Burner arrangement, in particular for a vehicle heater
DE102004057271B4 (en) * 2004-11-26 2008-04-24 Webasto Ag Assembly for a heater and methods of making the same
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
DE102005055642A1 (en) 2005-11-22 2007-05-24 J. Eberspächer GmbH & Co. KG Combustion chamber assembly for an evaporator burner
DE102006013241A1 (en) * 2006-03-22 2007-09-27 J. Eberspächer GmbH & Co. KG Ignition assembly for a combustion chamber assembly of a vehicle heater

Also Published As

Publication number Publication date
ATE497129T1 (en) 2011-02-15
DE102007061518A1 (en) 2009-06-25
DE502008002461D1 (en) 2011-03-10
EP2072898A1 (en) 2009-06-24

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