EP1696175B1 - Combustion chamber housing for a vaporising burner - Google Patents

Combustion chamber housing for a vaporising burner Download PDF

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Publication number
EP1696175B1
EP1696175B1 EP06001890A EP06001890A EP1696175B1 EP 1696175 B1 EP1696175 B1 EP 1696175B1 EP 06001890 A EP06001890 A EP 06001890A EP 06001890 A EP06001890 A EP 06001890A EP 1696175 B1 EP1696175 B1 EP 1696175B1
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EP
European Patent Office
Prior art keywords
combustion chamber
housing component
end section
housing
tube
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EP06001890A
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German (de)
French (fr)
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EP1696175A1 (en
Inventor
Walter Blaschke
Wolfgang Pfister
Hermann Eppler
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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Priority to PL06001890T priority Critical patent/PL1696175T3/en
Publication of EP1696175A1 publication Critical patent/EP1696175A1/en
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Publication of EP1696175B1 publication Critical patent/EP1696175B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D3/00—Burners using capillary action
    • F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/44—Preheating devices; Vaporising devices
    • F23D11/441—Vaporising devices incorporated with burners
    • F23D11/448—Vaporising devices incorporated with burners heated by electrical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2213/00—Burner manufacture specifications

Definitions

  • the present invention relates to a combustion chamber housing for an evaporator burner according to the preamble of claim 1.
  • Such combustion chamber housings which are used in evaporator burners in vehicle heaters, are generally constructed of sheet metal material. They may be formed in one or more parts, and the sheet metal parts used to construct such a combustion chamber housing are formed from stamped or bent sheet metal tubular pieces. The assembly of the individual components is generally carried out by spot welding, soldering or other non-cutting connection techniques. In the manufacture of such a housing assembly, the bottom region is also formed or attached, in which bottom region a porous evaporator medium is generally provided. By this type of production, it is generally no longer possible to carry out subsequent replacement measures, in particular in the region of the combustion chamber floor.
  • the US 2004/0173692 A1 discloses an evaporator burner for a vehicle heater.
  • the evaporator burner has a combustion chamber housing, which is constructed with a tube-like housing component produced, for example, in a casting process, which is open at its two axial ends. At one of these axial ends of the tubular housing member is attached with an annular end face of the pipe wall to a shell-like bottom and connected thereto. In this bowl-like bottom, a porous evaporator medium is included, in which liquid fuel is fed.
  • the DE 37 26 862 A1 discloses a motor vehicle heater having a porous evaporator medium provided in a bottom portion.
  • the porous evaporator medium is located in a carrier, which is applied to an annular end face of a tubular housing part of a combustion chamber housing.
  • a securing member is added, which engages behind the carrier on its side facing away from the porous evaporator medium side and presses with an elastic locking tab against the axial end of the tubular housing member.
  • a combustion chamber housing for an evaporator burner in particular for a vehicle heater, according to claim 1.
  • This comprises a tubular housing member which is open in its first axial end region, with respect to a longitudinal axis of the tubular housing member, for providing an exit port for combustion products and in its second axial end portion is open for receiving a bottom assembly, wherein the housing member in a casting process is made.
  • the combustion chamber housing or the tubular housing component thereof in a casting process with metal material, for example a MIM (Metal Injection Molding) casting process or a precision casting process, on the one hand a thermally very stable assembly is obtained, on the other hand by using appropriate casting molds with largely variable Shaping can be designed.
  • the material thickness of such a housing component can be adapted to the locally occurring requirements by appropriate shaping.
  • the MIM method is characterized by the fact that filigree shapes and thin-walled geometries can be represented. By thin-walled geometries, the thermal mass can be reduced and thereby the heating behavior of a combustion chamber can be accelerated or the temperature level of the evaporator can be influenced.
  • the tubular housing component has at its second axial end region on an inner side a contact formation for the axial support of the base assembly.
  • This investment formation can form an integral part of the tubular housing component, d. H. be formed at this production of the casting process.
  • a subsequent machining operation for producing or possibly refining such a formation is possible.
  • the investment formation may comprise, for example, a contact shoulder projecting radially inward, but may alternatively also be formed by a step-like widening of the housing component.
  • a recess for engagement with a securing element is provided which holds the base assembly in contact with the formation formation.
  • a securing element is provided at the second axial end portion on the inside of the tubular housing member which holds the base assembly in contact with the formation formation.
  • a plurality of air inlet openings is provided in a region of the tubular housing component surrounding a combustion chamber. Furthermore, it is advantageous if an ignition element receiving formation is formed in a region of the tubular housing component surrounding a combustion chamber.
  • a flame diaphragm surrounding the outlet opening provided for the flame outlet or the exit of combustion products can be provided.
  • the invention further relates to a combustion chamber assembly for a vehicle heater with a combustion chamber housing according to the invention and a bottom assembly inserted into the second axial end region of the tubular housing component and locked there.
  • the base assembly comprises a porous evaporator medium and a heater and a bottom plate on a side thereof facing away from a combustion chamber.
  • the in the Fig. 1 illustrated combustion chamber assembly 10 includes a generally designated 12 combustion chamber housing. This in turn is essentially constructed with a tubular housing component 14, which is elongated in the direction of a longitudinal axis A. In a first axial end region 16 of the tubular housing component 14, a disc-like flame diaphragm 18 is provided thereon as an integral component, which provides an outlet opening 20 for the combustion products formed in a combustion chamber 22 surrounded by the tubular housing component 14 or a longitudinal region thereof. In this first axial end portion 16, the tubular housing member 14 is further connected to a flame tube 24, for example by soldering, welding or by clamping fit.
  • the tubular housing member 14 is also basically open. In the region of this second axial end region 32, the tubular housing component 14 is formed with a slightly greater wall thickness. On an inner side of this tubular housing component, a radially inwardly projecting abutment shoulder 34 is formed on the second axial end region 32, which is preferably completely circumferential in the circumferential direction and forms a contact formation for a base assembly 36. Slightly closer to the axial end than the abutment shoulder 34, a groove-like depression 38 is formed on the inside of the tubular housing component 14, into which a securing element 40 designed as a locking ring or the like engages or can engage. The bottom assembly 36 is then axially secured between the abutment shoulder 34 and the securing member 40.
  • said bottom assembly 36 comprises, in axial sequence, a porous evaporator medium 42, for example a mesh material, a knit, foamed ceramic or the like, for example in a dish-like support 43, then a heater 44 provided in the form of a heating coil or the like, a plate-like insulating element 46 and a bottom plate 48 comprises.
  • the porous evaporator medium 42 or the carrier 43 is supported in its radially outer region on the abutment shoulder 34, while the bottom plate 48 rests against the securing element 40.
  • a fuel supply line 50 passes through the bottom plate 48 and the isolation member 46 and extends to the porous evaporator medium 42 to introduce liquid fuel therein. The introduced fuel is distributed by capillary action in the porous evaporator medium 42 and transported in the direction of the combustion chamber 22 toward the exposed surface thereof.
  • a receiving formation 52 for serving for starting the combustion ignition member 54 for example, a Glühzünd21 formed.
  • This receiving formation 52 may for example comprise an opening in a wall region with a greater axial thickness in order to be able to stably support the ignition element 54 on the housing component 14.
  • the tubular housing component 14 is provided in the structure according to the invention as a cast metal component. It can be produced in a MIM casting or investment casting process from metal and / or ceramic material and, if necessary, can be reworked by machining. Making the tubular housing member 14 in a casting process allows for very complex shapes, such as the thickness variation seen in the second axial end region 32, so that the required stability for supporting the bottom assembly 36 can be obtained there. Even in other lengths a thickness variation is possible in a simple manner.
  • the groove-like depression 38 or the openings 30 can be incorporated, for example, below. Since at the in Fig. 1 recognizable structure the housing member 14 is formed at its two end portions 16, 32 with radially inwardly cross-sections, can be used in the production in a casting process, for example, with a lost casting core.
  • the recess 38 may be formed in the form of a plurality of radially inwardly projecting protrusions of the tubular housing member 14, similar to the abutment shoulder 34, which then, when viewed in the axial direction, again provide a depression or a support surface for a fuse element.
  • FIG. 2 an alternative embodiment of a combustion chamber assembly 10 is shown in a simplified manner. It can be seen again that the housing component 14 providing the combustion chamber housing 12 with the base assembly 36 inserted into it. In contrast to the in FIG Fig. 1 In the embodiment shown, in which the bottom assembly 36 abuts against a radially inwardly projecting abutment shoulder 34 is in the in Fig. 2 In the embodiment variant shown, the housing component 14 is designed to provide a contact formation for the base assembly 36 with a step-like radial extension 60. At this, the bottom assembly 36 is supported, for example, on the shell-like support 43 of the porous evaporator medium 42 and is held by the securing element 40 in contact with this radial extension 60.
  • the housing component 14 does not have portions that reduce its cross-section, so that it is not necessary to work with a lost shape when producing in a casting process.
  • the groove-like recess 38 for the fuse element 40 can be subsequently formed by screwing or the like.
  • a modification of such an embodiment is in the 3 and 4 shown.
  • the investment formation for the bottom assembly 36 in Substantially again formed by the radial extension 60.
  • these securing tabs 64 are then bent radially inward, so that they engage behind the bottom assembly 36 and the bottom plate 48 thereof at the side facing away from the radial extension 60 and the investment formation for the bottom assembly 36 side and hold securely.
  • FIG. 5 Another variation is in Fig. 5 shown.
  • Fig. 5 is provided for the secure mounting of the base assembly 36 on the housing member 14 by a plurality of formed in the region 62 after insertion of the bottom assembly 36 fuse impressions 66. These also engage behind the bottom plate 48 of the base assembly 36 on its side facing away from the radial extension 60 side and thus hold the bottom assembly 36 securely in the housing member 14th

Description

Die vorliegende Erfindung betrifft ein Brennkammergehäuse für einen Verdampferbrenner gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a combustion chamber housing for an evaporator burner according to the preamble of claim 1.

Derartige Brennkammergehäuse, die bei Verdampferbrennern in Fahrzeugheizgeräten Einsatz finden, sind im Allgemeinen aus Blechmaterial aufgebaut. Sie können ein- oder mehrteilig ausgebildet sein, und die zum Aufbau eines derartigen Brennkammergehäuses eingesetzten Blechteile werden aus gestanzten bzw. gebogenen Blechrohrlingen geformt. Das Zusammenfügen der Einzelkomponenten erfolgt im Allgemeinen durch Punktschweißen, Löten oder andere spanlose Verbindungstechniken. Bei der Herstellung einer derartigen Gehäusebaugruppe wird auch der Bodenbereich mit angeformt bzw. angebracht, in welchem Bodenbereich im Allgemeinen ein poröses Verdampfermedium vorgesehen ist. Durch diese Art der Herstellung ist es im Allgemeinen nicht mehr möglich, nachträgliche Austauschmaßnahmen insbesondere im Bereich des Brennkammerbodens vorzunehmen.Such combustion chamber housings, which are used in evaporator burners in vehicle heaters, are generally constructed of sheet metal material. They may be formed in one or more parts, and the sheet metal parts used to construct such a combustion chamber housing are formed from stamped or bent sheet metal tubular pieces. The assembly of the individual components is generally carried out by spot welding, soldering or other non-cutting connection techniques. In the manufacture of such a housing assembly, the bottom region is also formed or attached, in which bottom region a porous evaporator medium is generally provided. By this type of production, it is generally no longer possible to carry out subsequent replacement measures, in particular in the region of the combustion chamber floor.

Die US 2004/0173692 A1 offenbart einen Verdampferbrenner für ein Fahrzeugheizgerät. Der Verdampferbrenner weist ein Brennkammergehäuse auf, das mit einem beispielsweise in einem Gussverfahren hergestellten rohrartigen Gehäusebauteil aufgebaut ist, das an seinen beiden axialen Enden offen ist. An einem dieser axialen Enden ist das rohrartige Gehäusebauteil mit einer ringartigen Stirnfläche der Rohrwandung an einen schalenartigen Boden angesetzt und damit verbunden. In diesem schalenartigen Boden ist ein poröses Verdampfermedium enthalten, in welches flüssiger Brennstoff eingespeist wird.The US 2004/0173692 A1 discloses an evaporator burner for a vehicle heater. The evaporator burner has a combustion chamber housing, which is constructed with a tube-like housing component produced, for example, in a casting process, which is open at its two axial ends. At one of these axial ends of the tubular housing member is attached with an annular end face of the pipe wall to a shell-like bottom and connected thereto. In this bowl-like bottom, a porous evaporator medium is included, in which liquid fuel is fed.

Die DE 37 26 862 A1 offenbart eine Kraftfahrzeugheizung mit einem in einem Bodenbereich vorgesehenen porösen Verdampfermedium. Das poröse Verdampfermedium liegt in einem Träger, der an eine ringartige Stirnfläche eines rohrartig ausgebildeten Gehäusebauteils eines Brennkammergehäuses angelegt ist. An die Außenseite dieses rohrartigen Gehäusebauteils ist ein Sicherungsorgan angefügt, das den Träger an seiner vom porösen Verdampfermedium abgewandten Seite hintergreift und mit einer elastischen Sicherungslasche gegen das axiale Ende des rohrartigen Gehäusebauteils presst.The DE 37 26 862 A1 discloses a motor vehicle heater having a porous evaporator medium provided in a bottom portion. The porous evaporator medium is located in a carrier, which is applied to an annular end face of a tubular housing part of a combustion chamber housing. To the outside of this tubular housing component, a securing member is added, which engages behind the carrier on its side facing away from the porous evaporator medium side and presses with an elastic locking tab against the axial end of the tubular housing member.

Es ist die Aufgabe der vorliegenden Erfindung, ein Brennkammergehäuse für einen Verdampferbrenner vorzusehen, das bei einfachem Aufbau insbesondere auch zur Durchführung von Wartungsarbeiten oder Reparaturarbeiten besser geeignet ist.It is the object of the present invention to provide a combustion chamber housing for an evaporator burner, which is particularly suitable for performing maintenance or repair work with a simple structure in particular.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Brennkammergehäuse für einen Verdampferbrenner, insbesondere für ein Fahrzeugheizgerät, gemäß Anspruch 1. Dieses umfasst ein rohrartiges Gehäusebauteil, das in seinem ersten axialen Endbereich, bezogen auf eine Längsachse des rohrartigen Gehäusebauteils, zum Bereitstellen einer Austrittsöffnung für Verbrennungsprodukte offen ist und in seinem zweiten axialen Endbereich zur Aufnahme einer Bodenbaugruppe offen ist, wobei das Gehäusebauteil in einem Gießvorgang hergestellt ist.According to the invention this object is achieved by a combustion chamber housing for an evaporator burner, in particular for a vehicle heater, according to claim 1. This comprises a tubular housing member which is open in its first axial end region, with respect to a longitudinal axis of the tubular housing member, for providing an exit port for combustion products and in its second axial end portion is open for receiving a bottom assembly, wherein the housing member in a casting process is made.

Durch das Herstellen des Brennkammergehäuses bzw. des rohrartigen Gehäusebauteils desselben in einem Gussverfahren mit Metallmaterial, beispielsweise einem MIM-(Metal Injection Moulding)-Gussverfahren oder einem Feingussverfahren, wird einerseits eine thermisch sehr stabile Baugruppe erhalten, die andererseits durch Einsatz entsprechender Gussformen mit weitgehend variabler Formgebung ausgestaltet werden kann. Insbesondere kann durch entsprechende Formgestaltung die Materialstärke eines derartigen Gehäusebauteils an die lokal jeweils auftretenden Anforderungen angepasst werden. Besonders das MIM-Verfahren zeichnet sich dadurch aus, dass filigrane Formen und dünnwandige Geometrien dargestellt werden können. Durch dünnwandige Geometrien kann die thermische Masse reduziert werden und dadurch das Aufheizverhalten einer Brennkammer beschleunigt werden bzw. das Temperaturniveau des Verdampfers beeinflusst werden.By producing the combustion chamber housing or the tubular housing component thereof in a casting process with metal material, for example a MIM (Metal Injection Molding) casting process or a precision casting process, on the one hand a thermally very stable assembly is obtained, on the other hand by using appropriate casting molds with largely variable Shaping can be designed. In particular, the material thickness of such a housing component can be adapted to the locally occurring requirements by appropriate shaping. In particular, the MIM method is characterized by the fact that filigree shapes and thin-walled geometries can be represented. By thin-walled geometries, the thermal mass can be reduced and thereby the heating behavior of a combustion chamber can be accelerated or the temperature level of the evaporator can be influenced.

Ferner ist vorgesehen, dass das rohrartige Gehäusebauteil an seinem zweiten axialen Endbereich an einer Innenseite eine Anlageformation zur axialen Abstützung der Bodenbaugruppe aufweist. Auch diese Anlageformation kann einen integralen Bestandteil des rohrartigen Gehäusebauteils bilden, d. h. bei Herstellung des Gussvorgangs an dieses angeformt werden. Selbstverständlich ist auch eine nachfolgende spanabhebende Bearbeitung zum Herstellen oder ggf. Verfeinern einer derartigen Formation möglich.Furthermore, it is provided that the tubular housing component has at its second axial end region on an inner side a contact formation for the axial support of the base assembly. This investment formation can form an integral part of the tubular housing component, d. H. be formed at this production of the casting process. Of course, a subsequent machining operation for producing or possibly refining such a formation is possible.

Die Anlageformation kann beispielsweise eine nach radial innen vorspringende Anlageschulter umfassen, kann alternativ aber auch durch eine stufenartige Erweiterung des Gehäusebauteils gebildet sein.The investment formation may comprise, for example, a contact shoulder projecting radially inward, but may alternatively also be formed by a step-like widening of the housing component.

Um eine Bodenbaugruppe an dem rohrartigen Gehäusebauteil arretieren zu können, ist gemäß einer ersten Alternative vorgesehen, dass am zweiten axialen Endbereich an der Innenseite des rohrartigen Gehäusebauteils eine Einsenkung zum Eingriff mit einem die Bodenbaugruppe in Anlage an der Anlageformation haltenden Sicherungselement vorgesehen ist. Zum sicheren Halten der Bodenbaugruppe in Anlage an der Anlageformation kann gemäß einer zweiten. Alternative auch am zweiten Endbereich des Gehäusebauteils eine Mehrzahl von mit diesem integralen und nach radial innen umgebogenen oder umbiegbaren Sicherungslaschen vorgesehen sein. Diese hintergreifen dann die Bodenbaugruppe an ihrer von der Anlageformation abgewandten Seite. Anstelle der Sicherungslaschen ist es gemäß einer dritten Alternative auch möglich, Sicherungseindrückungen in das Gehäusebauteil einzubringen, nachdem die Bodenbaugruppe in Anlage an der Anlageformation gebracht worden ist.In order to lock a base assembly to the tubular housing member, is provided according to a first alternative, that at the second axial end portion on the inside of the tubular housing member a recess for engagement with a securing element is provided which holds the base assembly in contact with the formation formation. For securely holding the floor assembly in abutment with the formation formation can according to a second. Alternative to be provided at the second end portion of the housing component a plurality of integral with this and radially inwardly bent or bendable securing tabs. These then engage behind the base assembly on its side facing away from the formation formation side. Instead of securing tabs, according to a third alternative, it is also possible to introduce securing indentations into the housing component after the bottom assembly has been brought into abutment with the contact formation.

Um die Zufuhr von Verbrennungsluft zu ermöglichen, wird vorgeschlagen, dass in einem eine Brennkammer umgebenden Bereich des rohrartigen Gehäusebauteils eine Mehrzahl von Lufteintrittsöffnungen vorgesehen ist. Weiterhin ist es vorteilhaft, wenn in einem eine Brennkammer umgebenden Bereich des rohrartigen Gehäusebauteils eine Zündorgan-Aufnahmeformation gebildet ist.In order to enable the supply of combustion air, it is proposed that a plurality of air inlet openings is provided in a region of the tubular housing component surrounding a combustion chamber. Furthermore, it is advantageous if an ignition element receiving formation is formed in a region of the tubular housing component surrounding a combustion chamber.

Am ersten axialen Endbereich kann eine die für den Flammaustritt bzw. den Austritt von Verbrennungsprodukten vorgesehene Austrittsöffnung umgebende Flammblende vorgesehen sein.At the first axial end region, a flame diaphragm surrounding the outlet opening provided for the flame outlet or the exit of combustion products can be provided.

Die Erfindung betrifft ferner eine Brennkammerbaugruppe für ein Fahrzeugheizgerät mit einem erfindungsgemäßen Brennkammergehäuse sowie eine in den zweiten axialen Endbereich des rohrartigen Gehäusebauteils eingesetzte und dort arretierte Bodenbaugruppe.The invention further relates to a combustion chamber assembly for a vehicle heater with a combustion chamber housing according to the invention and a bottom assembly inserted into the second axial end region of the tubular housing component and locked there.

Dabei kann beispielsweise vorgesehen sein, dass die Bodenbaugruppe ein poröses Verdampfermedium und an einer von einer Brennkammer abgewandten Seite desselben eine Heizeinrichtung und eine Bodenplatte umfasst.In this case, it may be provided, for example, that the base assembly comprises a porous evaporator medium and a heater and a bottom plate on a side thereof facing away from a combustion chamber.

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

Fig. 1
eine Längsschnittansicht einer Brennkammerbaugruppe für ein Fahrzeugheizgerät;
Fig. 2
eine der Fig. 1 entsprechende, vereinfachte Ansicht eines alternativen Aufbaus;
Fig. 3
eine der Fig. 2 entsprechende Ansicht einer weiteren alternativen Ausgestaltungsform;
Fig. 4
eine Teil-Axialansicht des in Fig. 3 erkennbaren Gehäusebauteils;
Fig. 5
eine weitere der Fig. 2 entsprechende Ansicht einer alternativen Ausgestaltungsform.
The present invention will be described below with reference to the accompanying drawings Figures detailed. It shows:
Fig. 1
a longitudinal sectional view of a combustion chamber assembly for a vehicle heater;
Fig. 2
one of the Fig. 1 corresponding, simplified view of an alternative structure;
Fig. 3
one of the Fig. 2 corresponding view of another alternative embodiment;
Fig. 4
a partial axial view of the in Fig. 3 recognizable housing component;
Fig. 5
another one Fig. 2 corresponding view of an alternative embodiment.

Die in der Fig. 1 dargestellte Brennkammerbaugruppe 10 umfasst ein allgemein mit 12 bezeichnetes Brennkammergehäuse. Dieses wiederum ist im Wesentlichen aufgebaut mit einem rohrartigen Gehäusebauteil 14, das in Richtung einer Längsachse A langgestreckt ist. In einem ersten axialen Endbereich 16 des rohrartigen Gehäusebauteils 14 ist an diesem als integraler Bestandteil eine scheibenartige Flammblende 18 vorgesehen, die eine Austrittsöffnung 20 für die in einer von dem rohrartigen Gehäusebauteil 14 bzw. einem Längenbereich desselben umgebenen Brennkammer 22 entstehenden Verbrennungsprodukte bereitgestellt. In diesem ersten axialen Endbereich 16 ist das rohrartige Gehäusebauteil 14 weiterhin mit einem Flammrohr 24 verbunden, beispielsweise durch Verlötung, Verschweißung oder durch Klemmsitz. Dieses in einem Längenbereich 26 das rohrartige Gehäusebauteil 14 umgebende Flammrohr 24 bildet in diesem Längenbereich 26 gleichzeitig einen Verbrennungsluftzuführringraum 28, über welchen Verbrennungsluft zugeführt werden kann und durch in diesem Bereich des rohrartigen Gehäusebauteils 14 gebildete Öffnungen 30 in die Brennkammer 22 eintreten kann.The in the Fig. 1 illustrated combustion chamber assembly 10 includes a generally designated 12 combustion chamber housing. This in turn is essentially constructed with a tubular housing component 14, which is elongated in the direction of a longitudinal axis A. In a first axial end region 16 of the tubular housing component 14, a disc-like flame diaphragm 18 is provided thereon as an integral component, which provides an outlet opening 20 for the combustion products formed in a combustion chamber 22 surrounded by the tubular housing component 14 or a longitudinal region thereof. In this first axial end portion 16, the tubular housing member 14 is further connected to a flame tube 24, for example by soldering, welding or by clamping fit. This in a length range 26 surrounding the tube-like housing member 14 flame tube 24 forms in this length region 26 at the same time a Verbrennungsluftzuführringraum 28 through which combustion air can be supplied and formed in this region of the tubular housing member 14 openings 30 in the combustion chamber 22nd can occur.

In seinem zweiten axialen Endbereich 32 ist das rohrartige Gehäusebauteil 14 ebenfalls grundsätzlich offen. Im Bereich dieses zweiten axialen Endbereichs 32 ist das rohrartige Gehäusebauteil 14 mit etwas größerer Wandungsstärke ausgebildet. An einer Innenseite dieses rohrartigen Gehäusebauteils ist am zweiten axialen Endbereich 32 eine nach radial innen vorspringende Anlageschulter 34 gebildet, die vorzugsweise in Umfangsrichtung vollständig umlaufend ist und eine Anlageformation für eine Bodenbaugruppe 36 bildet. Etwas näher zum axialen Ende als die Anlageschulter 34 ist an der Innenseite des rohrartigen Gehäusebauteils 14 eine nutartige Einsenkung 38 gebildet, in welche ein als Rastring oder dergleichen ausgebildetes Sicherungselement 40 eingreift bzw. eingreifen kann. Die Bodenbaugruppe 36 ist dann zwischen der Anlageschulter 34 und dem Sicherungselement 40 axial gesichert.In its second axial end portion 32, the tubular housing member 14 is also basically open. In the region of this second axial end region 32, the tubular housing component 14 is formed with a slightly greater wall thickness. On an inner side of this tubular housing component, a radially inwardly projecting abutment shoulder 34 is formed on the second axial end region 32, which is preferably completely circumferential in the circumferential direction and forms a contact formation for a base assembly 36. Slightly closer to the axial end than the abutment shoulder 34, a groove-like depression 38 is formed on the inside of the tubular housing component 14, into which a securing element 40 designed as a locking ring or the like engages or can engage. The bottom assembly 36 is then axially secured between the abutment shoulder 34 and the securing member 40.

Man erkennt in der Fig. 1, dass diese Bodenbaugruppe 36 in axialer Abfolge ein poröses Verdampfermedium 42, beispielsweise ein Geflechtmaterial, ein Gewirk, Schaumkeramik oder dergleichen, beispielsweise in einem schalenartigen Träger 43, darauf folgend dann eine in Form einer Heizspirale oder dergleichen bereitgestellte Heizeinrichtung 44, ein plattenartiges Isolationselement 46 und eine Bodenplatte 48 umfasst. Das poröse Verdampfermedium 42 bzw. der Träger 43 stützt sich in seinem radial äußeren Bereich an der Anlageschulter 34 ab, während die Bodenplatte 48 gegen das Sicherungselement 40 anliegt. Eine Brennstoffzuführleitung 50 durchsetzt die Bodenplatte 48 und das Isolationselement 46 und reicht bis zum porösen Verdampfermedium 42, um flüssigen Brennstoff in dieses einzuleiten. Der eingeleitete Brennstoff wird durch Kapillarförderwirkung in dem porösen Verdampfermedium 42 verteilt und in Richtung zu der zur Brennkammer 22 hin frei liegenden Oberfläche desselben transportiert.One recognizes in the Fig. 1 in that said bottom assembly 36 comprises, in axial sequence, a porous evaporator medium 42, for example a mesh material, a knit, foamed ceramic or the like, for example in a dish-like support 43, then a heater 44 provided in the form of a heating coil or the like, a plate-like insulating element 46 and a bottom plate 48 comprises. The porous evaporator medium 42 or the carrier 43 is supported in its radially outer region on the abutment shoulder 34, while the bottom plate 48 rests against the securing element 40. A fuel supply line 50 passes through the bottom plate 48 and the isolation member 46 and extends to the porous evaporator medium 42 to introduce liquid fuel therein. The introduced fuel is distributed by capillary action in the porous evaporator medium 42 and transported in the direction of the combustion chamber 22 toward the exposed surface thereof.

In dem axial an die Bodenbaugruppe 36 anschließenden bzw. sich mit dieser auch noch teilweise überlappenden Bereich des rohrartigen Gehäusebauteils 14 ist femer eine Aufnahmeformation 52 für ein zum Starten der Verbrennung dienendes Zündorgan 54, beispielsweise einen Glühzündstift, gebildet. Diese Aufnahmeformation 52 kann beispielsweise eine Öffnung in einem Wandungsbereich mit größerer axialer Dicke umfassen, um das Zündorgan 54 stabil am Gehäusebauteil 14 haltern zu können.In the axially adjoining the bottom assembly 36 and with this Also still partially overlapping region of the tubular housing member 14 is further a receiving formation 52 for serving for starting the combustion ignition member 54, for example, a Glühzündstift formed. This receiving formation 52 may for example comprise an opening in a wall region with a greater axial thickness in order to be able to stably support the ignition element 54 on the housing component 14.

Das rohrartige Gehäusebauteil 14 ist bei dem erfindungsgemäßen Aufbau als Gussbauteil aus Metall bereitgestellt. Es kann in einem MIM-Gussverfahren oder einem Feingussverfahren aus Metall- oder/und Keramikmaterial hergestellt werden und kann ggf., sofern erforderlich, durch spanabhebende Bearbeitung nachbearbeitet werden. Das Herstellen des rohrartigen Gehäusebauteils 14 in einem Gussverfahren ermöglicht sehr komplexe Formgebungen, beispielsweise die im zweiten axialen Endbereich 32 erkennbare Dickenvariation, so dass dort die erforderliche Stabilität zum Haltern der Bodenbaugruppe 36 erlangt werden kann. Auch in anderen Längenabschnitten ist in einfacher Art und Weise eine Dickenvariation möglich. Die nutartige Einsenkung 38 bzw. die Öffnungen 30 können beispielsweise nachfolgend eingearbeitet werden. Da bei dem in Fig. 1 erkennbaren Aufbau das Gehäusebauteil 14 an seinen beiden Endbereichen 16, 32 mit nach radial innen greifenden Abschnitten ausgebildet ist, kann bei der Herstellung in einem Gussverfahren beispielsweise mit einem verlorenen Gießkern gearbeitet werden.The tubular housing component 14 is provided in the structure according to the invention as a cast metal component. It can be produced in a MIM casting or investment casting process from metal and / or ceramic material and, if necessary, can be reworked by machining. Making the tubular housing member 14 in a casting process allows for very complex shapes, such as the thickness variation seen in the second axial end region 32, so that the required stability for supporting the bottom assembly 36 can be obtained there. Even in other lengths a thickness variation is possible in a simple manner. The groove-like depression 38 or the openings 30 can be incorporated, for example, below. Since at the in Fig. 1 recognizable structure the housing member 14 is formed at its two end portions 16, 32 with radially inwardly cross-sections, can be used in the production in a casting process, for example, with a lost casting core.

Der Einsatz eines Gussbauteils ermöglicht also einen Aufbau, bei welchem die Bodenbaugruppe 36 in einfacher Art und Weise an dem die Außenumfangswandung bereitstellenden rohrartigen Gehäusebauteil 14 angebracht, aber ebenso einfach davon auch wieder gelöst werden kann. Insbesondere können auf diese Art und Weise Reparatur- oder Austauschmaßnahmen vorgenommen werden.The use of a cast component thus allows a structure in which the bottom assembly 36 in a simple manner attached to the outer peripheral wall providing tubular housing member 14, but just as easily can be solved again. In particular, repair or replacement measures can be carried out in this way.

Es sei darauf hingewiesen, dass selbstverständlich verschiedene Variationen im Umfang der vorliegenden Erfindung vorgenommen werden können. So kann selbstverständlich die Einsenkung 38 auch in Form mehrerer nach radial innen vorstehender Vorsprünge des rohrartigen Gehäusebauteils 14 gebildet sein, ähnlich wie die Anlageschulter 34, die dann, bei Betrachtung in axialer Richtung, wieder eine Einsenkung bzw. eine Abstützfläche für ein Sicherungselement bereitstellen.It should be understood that, of course, various variations can be made within the scope of the present invention. So Of course, the recess 38 may be formed in the form of a plurality of radially inwardly projecting protrusions of the tubular housing member 14, similar to the abutment shoulder 34, which then, when viewed in the axial direction, again provide a depression or a support surface for a fuse element.

In Fig. 2 ist eine alternative Ausgestaltungsform einer Brennkammerbaugruppe 10 in vereinfachter Art und Weise dargestellt. Man erkennt wieder das das Brennkammergehäuse 12 bereitstellende Gehäusebauteil 14 mit der in dieses eingesetzten Bodenbaugruppe 36. Im Unterschied zu der in Fig. 1 gezeigten Ausgestaltungsform, bei welcher die Bodenbaugruppe 36 an einer nach radial innen vorspringenden Anlageschulter 34 anliegt, ist bei der in Fig. 2 gezeigten Ausgestaltungsvariante das Gehäusebauteil 14 zum Bereitstellen einer Anlageformation für die Bodenbaugruppe 36 mit einer stufenartigen radialen Erweiterung 60 ausgebildet. An dieser stützt sich die Bodenbaugruppe 36 beispielsweise über den schalenartigen Träger 43 des porösen Verdampfermediums 42 ab und ist durch das Sicherungselement 40 in Anlage an dieser radialen Erweiterung 60 gehalten. Man erkennt, dass bei dieser Ausgestaltungsform vom ersten Endbereich 16 zum zweiten Endbereich 32 das Gehäusebauteil 14 keine dessen Querschnitt verringernde Abschnitte aufweist, so dass bei Herstellung in einem Gießvorgang nicht mit einer verlorenen Form gearbeitet werden muss. Die nutartige Einsenkung 38 für das Sicherungselement 40 kann nachträglich durch Eindrehen oder dergleichen gebildet werden.In Fig. 2 an alternative embodiment of a combustion chamber assembly 10 is shown in a simplified manner. It can be seen again that the housing component 14 providing the combustion chamber housing 12 with the base assembly 36 inserted into it. In contrast to the in FIG Fig. 1 In the embodiment shown, in which the bottom assembly 36 abuts against a radially inwardly projecting abutment shoulder 34 is in the in Fig. 2 In the embodiment variant shown, the housing component 14 is designed to provide a contact formation for the base assembly 36 with a step-like radial extension 60. At this, the bottom assembly 36 is supported, for example, on the shell-like support 43 of the porous evaporator medium 42 and is held by the securing element 40 in contact with this radial extension 60. It can be seen that, in this embodiment, from the first end region 16 to the second end region 32, the housing component 14 does not have portions that reduce its cross-section, so that it is not necessary to work with a lost shape when producing in a casting process. The groove-like recess 38 for the fuse element 40 can be subsequently formed by screwing or the like.

Um bei einer derartigen Formgebung des Gehäusebauteils 14 den Herstellungsvorgang etwas zu erleichtern, kann vorgesehen sein, dass dieses vom ersten Endbereich 16 zum zweiten Endbereich 32 hin in seinem näherungsweise zylindrischen Abschnitt sich geringfügig erweiternd ausgebildet ist, um eine Entformungsschräge zu erzeugen.In order to facilitate the production process somewhat with such a shaping of the housing component 14, it can be provided that this is slightly widening from the first end region 16 to the second end region 32 in its approximately cylindrical section in order to produce a draft angle.

Eine Abwandlung einer derartigen Ausgestaltungsform ist in den Fig. 3 und 4 gezeigt. Auch hier ist die Anlageformation für die Bodenbaugruppe 36 im Wesentlichen wieder durch die radiale Erweiterung 60 ausgebildet. In dem in Richtung zum zweiten Endbereich 32 hin sich dann anschließenden näherungsweise zylindrischen Bereich 62 des Gehäusebauteils 64 ist dieses mit einer Mehrzahl von Sicherungslaschen 64 ausgebildet. Diese schließen bei Durchführung eines Gießvorgangs nach Fertigstellung des Gehäusebauteils 14 näherungsweise axial an den verbleibenden Teil des Bereichs 62 an, so dass auch hier die Bodenbaugruppe 36 in Anlage an der radialen Erweiterung gebracht werden kann. Nachfolgend werden diese Sicherungslaschen 64 dann nach radial innen umgebogen, so dass sie die Bodenbaugruppe 36 bzw. die Bodenplatte 48 derselben an der von der radialen Erweiterung 60 bzw. der Anlageformation für die Bodenbaugruppe 36 abgewandten Seite hintergreifen und sicher halten.A modification of such an embodiment is in the 3 and 4 shown. Again, the investment formation for the bottom assembly 36 in Substantially again formed by the radial extension 60. In the approximately cylindrical region 62 of the housing component 64 which adjoins the second end region 32 in the direction of the second end region 32, this is formed with a plurality of securing straps 64. These close when performing a casting process after completion of the housing member 14 approximately axially to the remaining part of the area 62, so that here too the bottom assembly 36 can be brought into contact with the radial extension. Subsequently, these securing tabs 64 are then bent radially inward, so that they engage behind the bottom assembly 36 and the bottom plate 48 thereof at the side facing away from the radial extension 60 and the investment formation for the bottom assembly 36 side and hold securely.

Eine weitere Abwandlung ist in Fig. 5 gezeigt. Hier ist für die sichere Halterung der Bodenbaugruppe 36 am Gehäusebauteil 14 durch eine Mehrzahl von im Bereich 62 nach Einsetzen der Bodenbaugruppe 36 gebildeten Sicherungseindrückungen 66 bereitgestellt. Auch diese hintergreifen die Bodenplatte 48 der Bodenbaugruppe 36 an ihrer von der radialen Erweiterung 60 abgewandten Seite und halten somit die Bodenbaugruppe 36 sicher im Gehäusebauteil 14.Another variation is in Fig. 5 shown. Here is provided for the secure mounting of the base assembly 36 on the housing member 14 by a plurality of formed in the region 62 after insertion of the bottom assembly 36 fuse impressions 66. These also engage behind the bottom plate 48 of the base assembly 36 on its side facing away from the radial extension 60 side and thus hold the bottom assembly 36 securely in the housing member 14th

Es sei darauf hingewiesen, dass selbstverständlich die in den Fig. 3 bis 5 gezeigten Sicherungsformationen, die also einen integralen Bestandteil des im Gussverfahren hergestellten Gehäusebauteils 14 bilden, auch bei der in Fig. 1 dargestellten Ausgestaltungsform mit der nach radial innen vorspringenden Anlageschulter 34 vorgesehen sein können.It should be noted that, of course, in the Fig. 3 to 5 shown fuse formations, which thus form an integral part of the housing component 14 produced in the casting process, even in the Fig. 1 illustrated embodiment with the radially inwardly projecting abutment shoulder 34 may be provided.

Claims (8)

  1. A combustion chamber housing for an evaporation burner, in particular for a vehicle heating device, comprising a tube-like housing component (14), being open in its first axial end section (16) in relation to a longitudinal axis (A) of the tube-like housing component for providing a discharge opening (20) for combustion products and being open in its second axial end section (32) for receiving a bottom assembly (36), the housing component (14) being manufactured by a single moulding process,
    the tube-like housing component (14) comprising an abutment formation (34) at an inner side of its second axial end section (32) for axial support of the bottom assembly (36),
    characterized in
    the bottom assembly being engaged from behind at a side facing away from the abutment formation (34) and being thus supported at the housing component (14),
    a depression (38) for engagement with a securing element (40) supporting the bottom assembly (36) in abutment against the abutment formation (34) being provided at the second axial end section (32) at the inner side of the tube-like housing component (14), or
    a plurality of radially inwards bent security latches (64) which are integral with the housing component (14) being provided at the second end section (32), or
    a plurality of securing indentations (66) being provided at the second end section (32).
  2. A combustion chamber housing according to claim 1,
    characterised in the abutment formation (34) comprising a radially inwards projecting abutment shoulder (34).
  3. A combustion chamber housing according to claim 1,
    characterised in the abutment formation (60) being formed by a step-like expansion (60) of the housing component (14).
  4. A combustion chamber housing according to one of claims 1 to 3,
    characterised in a plurality of air inlet openings (30) being provided in a section of the tube-like housing component (14) surrounding a combustion chamber (22).
  5. A combustion chamber housing according to one of claims 1 to 4,
    characterised in an ignition element receiving formation (52) being formed in a section of the tube-like housing component (14) surrounding a combustion chamber (22).
  6. A combustion chamber housing according to one of claims 1 to 5,
    characterised in a flame aperture (18), which is surrounding a discharge opening (20) for combustion products, being provided at the first axial end section (16).
  7. A combustion chamber assembly for a vehicle heating device comprising a combustion chamber housing (12) according to one of the preceding claims as well as a bottom assembly (36), which is inserted into the second axial end section (32) of the tube-like housing component (14) and is arrested therein.
  8. A combustion chamber assembly according to claim 7,
    characterised in the bottom assembly (36) comprising a porous evaporator medium (42) at a carrier and at a side thereof which is facing away from the combustion chamber (22) comprising a heating device (44) and a bottom plate (48).
EP06001890A 2005-01-31 2006-01-30 Combustion chamber housing for a vaporising burner Active EP1696175B1 (en)

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PL06001890T PL1696175T3 (en) 2005-01-31 2006-01-30 Combustion chamber housing for a vaporising burner

Applications Claiming Priority (1)

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DE102005004359A DE102005004359A1 (en) 2005-01-31 2005-01-31 Combustion chamber housing for evaporator burner e.g. vehicle heating device has tubular housing part, which is open in first axial end area, for providing outlet for combustion products whereby housing part is manufactured by casting

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EP1696175A1 EP1696175A1 (en) 2006-08-30
EP1696175B1 true EP1696175B1 (en) 2010-07-07

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DE (2) DE102005004359A1 (en)
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RU2310128C1 (en) 2007-11-10
DE102005004359A1 (en) 2006-08-03
EP1696175A1 (en) 2006-08-30
DE502006007349D1 (en) 2010-08-19
PL1696175T3 (en) 2010-12-31

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