EP2855909B1 - Device for conducting exhaust gas in an internal combustion engine - Google Patents

Device for conducting exhaust gas in an internal combustion engine Download PDF

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Publication number
EP2855909B1
EP2855909B1 EP13720363.4A EP13720363A EP2855909B1 EP 2855909 B1 EP2855909 B1 EP 2855909B1 EP 13720363 A EP13720363 A EP 13720363A EP 2855909 B1 EP2855909 B1 EP 2855909B1
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EP
European Patent Office
Prior art keywords
heat exchanger
exhaust gas
internal combustion
combustion engine
housing
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Application number
EP13720363.4A
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German (de)
French (fr)
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EP2855909A1 (en
Inventor
Udo Rauschning
Wolfgang Graul
Markus Wallraven
Boris MARCIK
Patrick SUTTY
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Pierburg GmbH
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Pierburg GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts

Definitions

  • the device according to the invention shown in the figures for exhaust system consists of a mixing housing 10, to which a Heat exchanger 12 is attached.
  • the mixing housing 10 has an opening 14, in which a designed as a plug valve exhaust gas recirculation valve 16 is inserted, which is fastened by means of screws 18 to a flange 20 which surrounds the opening 14.
  • the exhaust gas recirculation valve 16 has a flow housing 22 with an inlet 24 and an outlet 26, each opening into the mixing housing 10. Between inlet 24 and outlet 26 there is a valve body which can not be recognized in the drawings, by means of which a flow cross-section from inlet 24 to outlet 26 can be regulated in accordance with the activation of an actuator 28.
  • the heat exchanger 12 is in the present embodiment, a flat tube bundle heat exchanger having an outer housing 34 which defines a coolant jacket radially outward and in which the flat tubes of the heat exchanger 12 extend.
  • These flat tubes are each soldered to correspondingly shaped openings 36 in a flange plate 38 and have a U-shape, so that both ends of the flat tubes in the openings 36 of the same flange plate 38 open.
  • the flat tubes with the flange plate 38 form an inner housing 39 of the heat exchanger 12.
  • the openings 36 of this flange plate 38 form not only the inlet 30 but also the outlet 40 into which the second ends of the flat tubes open.
  • This outlet 40 opens into an outlet space 42 in the mixing housing 10 which has an outlet opening 44, via which the exhaust gas can leave the mixing housing 10.
  • the flange plate 38 is fixed to a flange 46 on the outer housing 34, this can be done either by soldering or welding or in the present embodiment by screws 48.
  • the mixing housing 10 is also connected via a formed on the mixing housing 10 flange 50 but via another hole pattern with the flange plate 38 and the outer housing 34 with the interposition of a seal 52 by means not shown screws.
  • a pre-positioning of the mixing housing 10 to the flange 38 is made by the heads of the screws 48 which are used for mounting the flange 38 on the outer housing 34 are used as dowel pins by these project into corresponding openings 54 on the flange 50 of the mixing housing 10.
  • a bypass flap 56 is eccentrically mounted in the mixing housing 10 via a shaft 58.
  • the bypass flap 56 has two end positions in which it closes either the inlet 30 of the heat exchanger 12 or a bypass channel, which is formed by a direct connection of the inlet space 32 with the outlet space 42 in the mixing housing 10.
  • a circumferential first valve seat 60 is correspondingly formed on the mixing housing 10, on which the bypass flap 56 rests circumferentially in the position closing the bypass passage.
  • a second valve seat 62 is formed by a collar 64, which is fastened to the flange plate 38 of the heat exchanger 12 at the opposite side to the first flat tube ends, in particular by soldering, and thus protrudes into the inlet space 32 of the mixing housing 10.
  • the above positioning is important to a dense
  • the collar 64 unlike the bypass flap 56, is not fastened directly but only indirectly via the flange plate 38 to the mixing housing 10, the closure can be reached on the collar 64 when the bypass flap 56 rests on it.
  • the mounting of the collar 64 is very simple.
  • One end of the shaft 58 protrudes from the mixing housing 10 to the outside.
  • an eccentric 72 is arranged, which is connectable in a known manner with an actuator, not shown.
  • the second valve seat 62 can be aligned by means of the collar 64 with little effort and without necessary mechanical processing of the mixing housing 10 via the flange plate 38 to the bypass valve 56, wherein pressure losses are reduced in the exhaust system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Silencers (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Abgasführung in einer Verbrennungskraftmaschine mit einem Wärmetauscher mit einem Innengehäuse und einem Außengehäuse, einer Bypassklappe, einem Mischgehäuse, in dem die Bypassklappe gelagert ist und welches am Wärmetauscher befestigt ist, einem ersten Ventilsitz, der am Mischgehäuse ausgebildet ist und auf dem die Bypassklappe im den Bypass verschließenden Zustand aufliegt und einem zweiten Ventilsitz, auf dem die Bypassklappe in dem den Wärmetauscher verschließenden Zustand aufliegt.The invention relates to a device for exhaust system in an internal combustion engine with a heat exchanger having an inner housing and an outer housing, a bypass valve, a mixing housing in which the bypass valve is mounted and which is fixed to the heat exchanger, a first valve seat which is formed on the mixing housing and on which rests the bypass flap in the bypass-closing state and a second valve seat on which rests the bypass flap in the heat exchanger closing state.

Derartige Vorrichtungen zur Abgasführung werden vor allem im Bereich der Abgasrückführung bei Verbrennungsmotoren in Kraftfahrzeugen verwendet. Dabei wird das beim Verbrennungsprozess entstehende Abgas über eine Abgasrückführleitung zur Verminderung der Schadstoffemissionen dem Verbrennungsprozess erneut zugeführt. Eine weitere Verringerung, insbesondere der entstehenden Stickoxide, wird durch die Kühlung des Abgases und die damit verbundene Herabsetzung der Verbrennungstemperatur erreicht, weswegen Abgaskühler eingesetzt werden. Dieser Effekt wird jedoch während der Warmlaufphase des Verbrennungsmotors konterkariert, da ein Anspringen des Katalysators durch die niedrigen Temperaturen verhindert wird, wodurch Kohlenwasserstoffe und Kohlenmonoxide nicht mehr entfernt werden. Aus diesem Grund können Abgaskühler in modernen Verbrennungsmotoren zumindest während der Warmlaufphase über einen Bypass umgangen werden, wodurch die Aufheizzeit deutlich verkürzt wird.Such devices for exhaust system are mainly used in the field of exhaust gas recirculation in internal combustion engines in motor vehicles. In this case, the exhaust gas produced during the combustion process is fed back to the combustion process via an exhaust gas recirculation line for the purpose of reducing pollutant emissions. A further reduction, in particular of the resulting nitrogen oxides, is achieved by the cooling of the exhaust gas and the associated reduction in the combustion temperature, which is why exhaust gas coolers are used. However, this effect is thwarted during the warm-up phase of the internal combustion engine, as the catalyst is prevented from starting up due to the low temperatures, whereby hydrocarbons and carbon monoxides are no longer removed. For this reason, exhaust gas coolers can be bypassed in modern internal combustion engines, at least during the warm-up phase via a bypass, whereby the heating time is significantly reduced.

Es sind verschiedene Vorrichtungen und insbesondere Baueinheiten mit Kühlern, Bypassklappen und Abgasrückführventilen bekannt geworden. Häufig besteht dabei das Problem, dass bei geringem Bauraum aufgrund der notwendigen Umlenkungen des Abgasstromes ein erhöhter Druckverlust entsteht, der wiederum zu einem reduzierten Spülgefälle und somit verringerten Abgasrückführraten führt.Various devices and in particular assemblies with coolers, bypass flaps and exhaust gas recirculation valves have become known. Frequently, there is the problem that with little space due to the necessary deflections of the exhaust gas flow, an increased pressure loss occurs, which in turn leads to a reduced purge gradient and thus reduced exhaust gas recirculation rates.

Aus diesem Grund wird in der DE 10 2006 035 423 A1 eine Abgasrezirkulationsvorrichtung offenbart, bei der ein in einem Mischgehäuse und vor einem Abgaskühler angeordnete Bypassklappe zwei Endstellungen aufweist, von denen in der ersten Endstellung eine im Wesentlichen gerade Einströmung in einen Wärmetauscher erfolgen kann. Bei Umgehung des Wärmetauschers muss das Abgas um etwa 90° umgelenkt werden. Um hier zu hohe Druckverluste zu vermeiden, wird die Bypassklappe in ihrer anderen Endstellung in einem Winkel von etwa 45° angeströmt. Etwa im gleichen Winkel strömt das Abgas von der Klappenoberfläche weiter, so dass eine sanfte Umlenkung mit deutlich verringertem Druckverlust folgt.For this reason, in the DE 10 2006 035 423 A1 discloses an exhaust gas recirculation device, wherein arranged in a mixing housing and in front of an exhaust gas cooler bypass flap has two end positions, of which in the first end position, a substantially straight inflow into a heat exchanger can take place. When bypassing the heat exchanger, the exhaust gas must be deflected by about 90 °. To avoid too high pressure losses here, the bypass flap is flowed in its other end position at an angle of about 45 °. At approximately the same angle, the exhaust gas continues to flow from the flap surface, so that a gentle deflection with significantly reduced pressure loss follows.

Hierzu wird in das Mischgehäuse ein schräg abgeschnittener Rohrstutzen mittels Presssitz befestigt, dessen schräge Oberfläche den zweiten Ventilsitz bildet. Diese Montage ist aufwendig und erfordert eine mechanische Bearbeitung des Mischgehäuses, so dass ein erhöhter Herstell- und Montageaufwand zur Bereitstellung dieses Ventilsitzes besteht.For this purpose, an obliquely cut off pipe socket is attached by means of press fit in the mixing housing, the inclined surface forms the second valve seat. This assembly is complicated and requires mechanical processing of the mixing housing, so that there is an increased manufacturing and assembly costs for providing this valve seat.

Es stellt sich daher die Aufgabe, eine Vorrichtung zur Abgasrückführung mit geringem Druckverlust sowohl bei Durchströmung als auch bei Umgehung des Abgaskühlers zur Verfügung zu stellen, welche mit verringertem Montage- und Herstellaufwand erzeugt werden kann.It is therefore an object to provide a device for exhaust gas recirculation with low pressure loss both in flow and in bypassing the exhaust gas cooler available, which can be produced with reduced assembly and manufacturing costs.

Diese Aufgabe wird durch eine Vorrichtung zur Abgasführung in einer Verbrennungskraftmaschine mit den Merkmalen des Hauptanspruchs gelöst.This object is achieved by a device for exhaust system in an internal combustion engine having the features of the main claim.

Dadurch, dass am Innengehäuse des Wärmetauschers ein Kragen ausgebildet ist, der den zweiten Ventilsitz bildet, wird durch Befestigung des Wärmetauschergehäuses am Mischgehäuse gleichzeitig der Ventilsitz montiert. So entfallen Bearbeitungsschritte des Mischgehäuses.Characterized in that a collar is formed on the inner housing of the heat exchanger, which forms the second valve seat, the valve seat is mounted by fixing the heat exchanger housing to the mixing housing simultaneously. This eliminates processing steps of the mixing housing.

Vorzugsweise weist das Innengehäuse eine Flanschplatte auf, an der der Kragen ausgebildet ist. Diese Flanschplatte bildet eine gerade Oberfläche, welche zur maßgenauen Fixierung des Kragens genutzt werden kann, so dass der Ventilsitz korrekt zur Bypassklappe ausgerichtet ist.Preferably, the inner housing has a flange plate on which the collar is formed. This flange plate forms a straight surface, which can be used for dimensionally accurate fixation of the collar, so that the valve seat is aligned correctly with the bypass flap.

Damit dabei die Bauteileanzahl möglichst gering gehalten werden kann, begrenzt die Flanschplatte gleichzeitig einen Kühlmittelkanal zwischen Innengehäuse und Außengehäuse axial.So that the number of components can be kept as low as possible, the flange plate simultaneously limits a coolant channel between the inner housing and the outer housing axially.

Vorzugsweise ist das Mischgehäuse unter Zwischenlage der Flanschplatte am Außengehäuse des Wärmetauschers befestigt, so dass eine Positionierung aller drei Gehäuseteile zueinander in einem Befestigungsschritt erfolgt.Preferably, the mixing housing is attached with the interposition of the flange plate on the outer housing of the heat exchanger, so that a positioning of all three housing parts to each other takes place in a fastening step.

In einer bevorzugten Ausführungsform ist der Wärmetauscher ein Rohrbündelwärmetauscher, dessen Rohre an entsprechend zu den Rohren geformten Öffnungen der Flanschplatte befestigt sind, wobei der Kragen an der entgegengesetzten Seite der Flanschplatte befestigt ist und in das Mischgehäuse ragt. So kann der Kragen beim Lötvorgang der Rohre am Wärmetauscher ebenfalls festgelötet werden, so dass kein zusätzlicher Befestigungsschritt erforderlich ist.In a preferred embodiment, the heat exchanger is a shell and tube heat exchanger, the tubes of which are secured to openings of the flange plate shaped corresponding to the tubes, the collar being secured to the opposite side of the flange plate and projecting into the mixing housing. Thus, the collar can also be soldered during the soldering of the tubes to the heat exchanger, so that no additional attachment step is required.

Vorteilhaft ist es, wenn die Bypassklappe auf einer im Mischgehäuse gelagerten Welle exzentrisch befestigt ist und im geschlossenen Zustand jeweils umlaufend auf dem jeweiligen Ventilsitz aufliegt, da auf diese Weise eine hohe Dichtheit im geschlossenen Zustand erzielt wird.It is advantageous if the bypass flap is mounted eccentrically on a shaft mounted in the mixing housing and rests in the closed state in each case circumferentially on the respective valve seat, since in this way a high tightness is achieved in the closed state.

Eine besonders kompakte Anordnung mit sehr geringem axialem Bauraum ergibt sich, wenn der Wärmetauscher U-förmig durchströmbar ist und die Flanschplatte den Einlass und den Auslass des Wärmetauschers bildet, wobei Einlass und Auslass an gegenüberliegenden Seiten der Lagerung der Welle der Bypassklappe angeordnet sind.A particularly compact arrangement with very small axial space is obtained when the heat exchanger can be flowed through in a U-shape and the flange plate forms the inlet and the outlet of the heat exchanger, wherein inlet and outlet are arranged on opposite sides of the bearing of the shaft of the bypass valve.

Um sicherzustellen, dass beim Zusammenbau eine korrekte Positionierung der Klappe zum Ventilsitz erfolgt, sind am Mischgehäuse Öffnungen ausgebildet, in die Positionierelemente ragen, die am Wärmetauscher angeordnet sind. Durch diese korrekte Ausrichtung des Ventilsitzes zum Klappenkörper wird eine hohe Dichtigkeit im geschlossenen Zustand der Klappe sichergestellt.In order to ensure that during assembly, a correct positioning of the flap to the valve seat, openings are formed on the mixing housing, protrude into the positioning, which are arranged on the heat exchanger. This correct alignment of the valve seat to the valve body ensures a high tightness in the closed state of the flap.

In einer besonders bevorzugten Ausführung dienen die Schrauben, mittels derer die Flanschplatte am Außengehäuse des Wärmetauschers befestigt ist, als Positionierelemente, so dass auf zusätzliche Elemente zur Ausrichtung verzichtet werden kann, so dass ein exakter Sitz ohne weitere Montageschritte erreicht wird.In a particularly preferred embodiment, the screws, by means of which the flange plate is fastened to the outer housing of the heat exchanger, serve as positioning elements, so that additional elements for alignment can be dispensed with, so that an exact fit is achieved without further assembly steps.

In einer vorteilhaften alternativen Ausführung ist das Mischgehäuse mittels Passstiften zum Wärmetauscher ausgerichtet. Hier wird zwar ein weiterer Herstellungsschritt benötigt, jedoch können noch höhere Toleranzgenauigkeiten bei der Montage der beiden Gehäuse aneinander erzielt werden.In an advantageous alternative embodiment, the mixing housing is aligned by means of dowel pins to the heat exchanger. Although a further production step is required here, even higher tolerance accuracies can be achieved in the assembly of the two housings to one another.

Vorzugsweise besitzt eine Wand, welche an der vom Auslass des Wärmetauschers abgewandten Seite des Kragens ausgebildet ist, eine größere Ausdehnung als eine Wand, welche an der zum Auslass des Wärmetauschers gewandten Seite ausgebildet ist, so dass der Stellwinkel des Ventils verkleinert wird. Gleichzeitig entsteht eine sanfte Umlenkung des Gasstromes, so dass entstehende Druckverluste durch Wirbelbildung abrupte senkrechte Umlenkung weitestgehend vermieden werden.Preferably, a wall which is formed on the side facing away from the outlet of the heat exchanger side of the collar has a greater extent than a wall which is formed on the side facing the outlet of the heat exchanger, so that the adjusting angle of the valve is reduced. At the same time there is a gentle deflection of the gas flow, so that resulting pressure losses due to vortex formation abrupt vertical deflection are largely avoided.

Eine weitere Verringerung des auftretenden Druckverlustes wird erzielt, wenn im Mischgehäuse stromaufwärts der Bypassklappe ein Abgasrückführventil angeordnet ist, dessen Auslass gegenüberliegend zum Einlass des Wärmetauschers angeordnet ist, da auf diese Weise eine Strömungsrichtungsänderung beim Einströmen in das Mischgehäuse zunächst vermieden wird.A further reduction of the occurring pressure loss is achieved if an exhaust gas recirculation valve is arranged in the mixing housing upstream of the bypass valve, whose outlet is arranged opposite to the inlet of the heat exchanger, since in this way a flow direction change when flowing into the mixing housing is initially avoided.

Es wird somit eine Vorrichtung zur Abgasführung in einer Verbrennungskraftmaschine geschaffen, welche einerseits bei geringem Bauraum mit wenigen Montageschritten herzustellen ist und andererseits sowohl ein hohe Dichtigkeit des Ventils bei geringen Druckverlusten im geschlossenen Zustand des Wärmetauschers aufweist.It is thus an apparatus for exhaust management in an internal combustion engine created, which is on the one hand in a small space with few assembly steps to produce and on the other hand, both a high tightness of the valve at low pressure losses in the closed state of the heat exchanger has.

Ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zur Abgasführung in einer Verbrennungskraftmaschine ist in den Figuren dargestellt und wird nachfolgend beschrieben.

  • Figur 1 zeigt in teilweise geschnittener Ansicht einen Ausschnitt der erfindungsgemäßen Vorrichtung in perspektivischer Darstellung.
  • Figur 2 zeigt eine Seitenansicht eines Ausschnitts der erfindungsgemäßen Vorrichtung unmittelbar vor dem Zusammenbau in perspektivischer Darstellung.
An embodiment of a device according to the invention for the exhaust system in an internal combustion engine is shown in the figures and will be described below.
  • FIG. 1 shows a partial sectional view of a section of the device according to the invention in a perspective view.
  • FIG. 2 shows a side view of a section of the device according to the invention immediately prior to assembly in a perspective view.

Die in den Figuren dargestellte erfindungsgemäße Vorrichtung zur Abgasführung besteht aus einem Mischgehäuse 10, an welchem ein Wärmetauscher 12 befestigt ist. Das Mischgehäuse 10 weist eine Öffnung 14 auf, in welche ein als Steckventil ausgeführtes Abgasrückführventil 16 eingeschoben ist, welches mittels Schrauben 18 an einem Flansch 20, der die Öffnung 14 umgibt, befestigt ist.The device according to the invention shown in the figures for exhaust system consists of a mixing housing 10, to which a Heat exchanger 12 is attached. The mixing housing 10 has an opening 14, in which a designed as a plug valve exhaust gas recirculation valve 16 is inserted, which is fastened by means of screws 18 to a flange 20 which surrounds the opening 14.

Das Abgasrückführventil 16 weist ein Strömungsgehäuse 22 mit einem Einlass 24 und einem Auslass 26 auf, die jeweils in das Mischgehäuse 10 münden. Zwischen Einlass 24 und Auslass 26 befindet sich ein in den Zeichnungen nicht erkennbarer Ventilkörper, mittels dessen ein Durchströmungsquerschnitt vom Einlass 24 zum Auslass 26 entsprechend der Ansteuerung eines Aktors 28 regelbar ist.The exhaust gas recirculation valve 16 has a flow housing 22 with an inlet 24 and an outlet 26, each opening into the mixing housing 10. Between inlet 24 and outlet 26 there is a valve body which can not be recognized in the drawings, by means of which a flow cross-section from inlet 24 to outlet 26 can be regulated in accordance with the activation of an actuator 28.

In Verlängerung des Auslasses 26 des Abgasrückführventils 16 befindet sich ein Einlass 30 eines Wärmetauschers 12, so dass bei geöffnetem Abgasrückführventil 16 Abgas aus dem Auslass 26 über einen im Mischgehäuse 10 ausgebildeten Einlassraum 32 in den Einlass 30 des Wärmetauschers 12 strömen kann.In extension of the outlet 26 of the exhaust gas recirculation valve 16 is an inlet 30 of a heat exchanger 12, so that when the exhaust gas recirculation valve 16 is open, exhaust gas from the outlet 26 can flow into the inlet 30 of the heat exchanger 12 via an inlet space 32 formed in the mixing housing 10.

Der Wärmetauscher 12 ist im vorliegenden Ausführungsbeispiel ein Flachrohrbündelwärmetauscher, der ein Außengehäuse 34 aufweist, welches einen Kühlmittelmantel nach radial außen begrenzt und in dem die Flachrohre des Wärmetauschers 12 verlaufen. Diese Flachrohre sind jeweils an entsprechend geformte Öffnungen 36 in einer Flanschplatte 38 gelötet und weisen eine U-Form auf, so dass beide Enden der Flachrohre in den Öffnungen 36 der gleichen Flanschplatte 38 münden. So bilden die Flachrohre mit der Flanschplatte 38 ein Innengehäuse 39 des Wärmetauschers 12. Die Öffnungen 36 dieser Flanschplatte 38 bilden nicht nur den Einlass 30 sondern auch den Auslass 40, in den die zweiten Enden der Flachrohre münden. Dieser Auslass 40 mündet in einen Auslassraum 42 im Mischgehäuse 10 der eine Auslassöffnung 44 aufweist, über die das Abgas das Mischgehäuse 10 verlassen kann.The heat exchanger 12 is in the present embodiment, a flat tube bundle heat exchanger having an outer housing 34 which defines a coolant jacket radially outward and in which the flat tubes of the heat exchanger 12 extend. These flat tubes are each soldered to correspondingly shaped openings 36 in a flange plate 38 and have a U-shape, so that both ends of the flat tubes in the openings 36 of the same flange plate 38 open. Thus, the flat tubes with the flange plate 38 form an inner housing 39 of the heat exchanger 12. The openings 36 of this flange plate 38 form not only the inlet 30 but also the outlet 40 into which the second ends of the flat tubes open. This outlet 40 opens into an outlet space 42 in the mixing housing 10 which has an outlet opening 44, via which the exhaust gas can leave the mixing housing 10.

Zur Verbindung mit dem Außengehäuse 34 wird die Flanschplatte 38 an einem Flansch 46 am Außengehäuse 34 befestigt, wobei dies entweder durch Löten oder Schweißen oder im vorliegenden Ausführungsbeispiel durch Schrauben 48 erfolgen kann.For connection to the outer housing 34, the flange plate 38 is fixed to a flange 46 on the outer housing 34, this can be done either by soldering or welding or in the present embodiment by screws 48.

Das Mischgehäuse 10 wird ebenfalls über einen am Mischgehäuse 10 ausgebildeten Flansch 50 jedoch über ein anderes Lochbild mit der Flanschplatte 38 und dem Außengehäuse 34 unter Zwischenlage einer Dichtung 52 mittels nicht dargestellter Schrauben verbunden. Eine Vorpositionierung des Mischgehäuses 10 zur Flanschplatte 38 wird dabei vorgenommen, indem die Köpfe der Schrauben 48, welche für die Montage der Flanschplatte 38 am Außengehäuse 34 dienen als Passstifte genutzt werden, indem diese in entsprechende Öffnungen 54 am Flansch 50 des Mischgehäuses 10 ragen.The mixing housing 10 is also connected via a formed on the mixing housing 10 flange 50 but via another hole pattern with the flange plate 38 and the outer housing 34 with the interposition of a seal 52 by means not shown screws. A pre-positioning of the mixing housing 10 to the flange 38 is made by the heads of the screws 48 which are used for mounting the flange 38 on the outer housing 34 are used as dowel pins by these project into corresponding openings 54 on the flange 50 of the mixing housing 10.

Um nun Abgas wahlweise entweder über den Wärmetauscher 12 oder unter Umgehung des Wärmetauschers 12 direkt zur Auslassöffnung 44 des Mischgehäuses 10 führen zu können, ist im Mischgehäuse 10 eine Bypassklappe 56 exzentrisch über eine Welle 58 gelagert. Die Bypassklappe 56 weist zwei Endpositionen auf, in denen sie entweder den Einlass 30 des Wärmetauschers 12 oder einen Bypasskanal verschließt, der durch eine direkte Verbindung des Einlassraums 32 mit dem Auslassraum 42 im Mischgehäuse 10 gebildet wird. Zwischen dem Einlassraum 32 und dem Auslassraum 42 ist entsprechend ein umlaufender erster Ventilsitz 60 am Mischgehäuse 10 ausgebildet, auf dem die Bypassklappe 56 in der den Bypasskanal verschließenden Stellung umlaufend aufliegt.In order to be able to lead exhaust gas optionally either via the heat exchanger 12 or bypassing the heat exchanger 12 directly to the outlet opening 44 of the mixing housing 10, a bypass flap 56 is eccentrically mounted in the mixing housing 10 via a shaft 58. The bypass flap 56 has two end positions in which it closes either the inlet 30 of the heat exchanger 12 or a bypass channel, which is formed by a direct connection of the inlet space 32 with the outlet space 42 in the mixing housing 10. Between the inlet space 32 and the outlet space 42, a circumferential first valve seat 60 is correspondingly formed on the mixing housing 10, on which the bypass flap 56 rests circumferentially in the position closing the bypass passage.

Erfindungsgemäß wird ein zweiter Ventilsitz 62 durch einen Kragen 64 gebildet, der an der Flanschplatte 38 des Wärmetauschers 12 an der zu den ersten Flachrohrenden gegenüberliegenden Seite, insbesondere durch Löten befestigt ist und somit in den Einlassraum 32 des Mischgehäuses 10 ragt. Die vorbeschriebene Positionierung ist wichtig, um einen dichten Verschluss bei Auflage der Bypassklappe 56 auf dem Kragen 64 erreichen zu können, obwohl der Kragen 64 im Gegensatz zur Bypassklappe 56 nicht direkt, sondern lediglich indirekt über die Flanschplatte 38 am Mischgehäuse 10 befestigt ist. Die Montage des Kragens 64 gestaltet sich jedoch sehr einfach.According to the invention, a second valve seat 62 is formed by a collar 64, which is fastened to the flange plate 38 of the heat exchanger 12 at the opposite side to the first flat tube ends, in particular by soldering, and thus protrudes into the inlet space 32 of the mixing housing 10. The above positioning is important to a dense Although the collar 64, unlike the bypass flap 56, is not fastened directly but only indirectly via the flange plate 38 to the mixing housing 10, the closure can be reached on the collar 64 when the bypass flap 56 rests on it. However, the mounting of the collar 64 is very simple.

Eine vom Auslass 40 des Wärmetauschers 12 weiter entfernte Wand 66 des Kragens 64 ragt deutlich weiter in den Einlassraum 32, als eine zum Auslass 40 weisende Wand 68 des Kragens 64. Diese beiden entgegengesetzten Wände 66, 68 sind an ihren Enden durch entsprechend schräg verlaufende Wände 70 miteinander verbunden. Die Wände 66, 68, 70 des Kragens 64 umschließen alle als Einlass 30 dienenden Öffnungen 36 der Flanschplatte 38. Die Wände 70 schließen dabei einen Winkel von ca.35° ein, so dass die Bypassklappe 56 lediglich einen Stellbereich von ca. 55° aufweist. Damit die Bypassklappe 56 mit ihrem Randbereich vollständig auf dem zweiten Ventilsitz 62 aufliegen kann, ist die Welle 58 etwa in Höhe der zum Auslass 40 weisenden Wand 68 und parallel zu dieser im Mischgehäuse 10 gelagert. Dabei grenzt die Welle 58 im montierten Zustand unmittelbar an die Wand 68 an. Auch der erste Ventilsitz 60 ist in Höhe der Welle 58 angeordnet.A wall 66 of the collar 64 farther from the outlet 40 of the heat exchanger 12 projects significantly farther into the inlet space 32 than a wall 68 of the collar 64 facing the outlet 40. These two opposed walls 66, 68 are at their ends by correspondingly sloping walls 70 connected. The walls 66, 68, 70 of the collar 64 enclose all openings 36 of the flange plate 38 which serve as an inlet 30. The walls 70 enclose an angle of approximately 35 °, so that the bypass flap 56 only has an adjustment range of approximately 55 ° , So that the bypass flap 56 can rest completely on the second valve seat 62 with its edge region, the shaft 58 is mounted approximately in the height of the wall 68 facing the outlet 40 and parallel to it in the mixing housing 10. In this case, the shaft 58 directly adjoins the wall 68 in the mounted state. Also, the first valve seat 60 is disposed at the level of the shaft 58.

Ein Ende der Welle 58 ragt aus dem Mischgehäuse 10 nach außen. Auf diesem Ende der Welle 58 ist ein Exzenter 72 angeordnet, der in bekannter Weise mit einem nicht dargestellten Aktor verbindbar ist.One end of the shaft 58 protrudes from the mixing housing 10 to the outside. On this end of the shaft 58, an eccentric 72 is arranged, which is connectable in a known manner with an actuator, not shown.

In Figur 1 befindet sich die Bypassklappe 56 im den Bypasskanal verschließenden Zustand, trennt entsprechend den Einlassraum 32 vom Auslassraum 42 des Mischgehäuses 10, indem sie auf dem ersten Ventilsitz 60 umliegend aufliegt. In diesem Zustand strömt Abgas aus dem Abgasrückführventil 16 ohne umgelenkt zu werden gerade durch den Einlassraum 32 über die Bypassklappe 56 zum Einlass 30 des Wärmetauschers 12, der unmittelbar gegenüberliegend zum Auslass 26 des Abgasrückführventils 16 angeordnet ist. Von hier aus strömt das Abgas durch die Flachrohre des Wärmetauschers 12 und wird durch das zwischen den Flachrohren im Kühlmittelmantel strömende Kühlmittel gekühlt. Es strömt in U-Form durch den Wärmetauscher 12 und tritt über die Öffnungen 36 am Auslass 40 in den Auslassraum 42 des Mischgehäuses 10. Über die Auslassöffnung 44 verlässt das Abgas das Mischgehäuse und kann erneut den Zylindern des Verbrennungsmotors zugeführt werden.In FIG. 1 is the bypass valve 56 in the bypass passage occluding state, correspondingly separates the inlet space 32 from the outlet space 42 of the mixing housing 10 by resting on the first valve seat 60 surrounding. In this state, exhaust gas from the exhaust gas recirculation valve 16 flows without being deflected straight through the intake space 32 via the bypass door 56 to the inlet 30 of the heat exchanger 12 immediately opposite to the outlet 26 of FIG Exhaust gas recirculation valve 16 is arranged. From here, the exhaust gas flows through the flat tubes of the heat exchanger 12 and is cooled by the flowing between the flat tubes in the coolant jacket coolant. It flows in a U-shape through the heat exchanger 12 and passes through the openings 36 at the outlet 40 into the outlet space 42 of the mixing housing 10. Via the outlet opening 44, the exhaust gas leaves the mixing housing and can be fed again to the cylinders of the internal combustion engine.

Während der Warmlaufphase, also nach Kaltstart, ist es zur schnelleren Aufheizung des Verbrennungsmotors erwünscht, das Abgas ungekühlt dem Verbrennungsprozess zur Verfügung zu stellen. In diesem Fall befindet sich die Bypassklappe 56 auf dem am Kragen 64 ausgebildeten zweiten Ventilsitz 62. Somit strömt das aus dem Auslass 26 des Abgasrückführventils 16 stammende Abgas im Einlassraum 32 in Richtung der Bypassklappe 56. Durch deren Schrägstellung zur Hauptströmungsrichtung aufgrund der schrägen Ausbildung des zweiten Ventilsitzes 62 wird das Abgas sanfter umgelenkt und gelangt durch den ersten Ventilsitz 60 hindurch vom Einlassraum 32 unter Umgehung des Wärmetauschers 12 direkt in den Auslassraum 42 und somit zur Auslassöffnung 44. Eine Wirbelbildung, die zu einem erhöhten Druckverlust führen würde, wird so weitestgehend vermieden.During the warm-up phase, so after a cold start, it is desirable for faster heating of the internal combustion engine to provide the exhaust uncooled the combustion process. In this case, the bypass flap 56 is located on the second valve seat 62 formed on the collar 64. Thus, the exhaust gas originating from the outlet 26 of the exhaust gas recirculation valve 16 flows in the inlet space 32 in the direction of the bypass flap 56. By its inclination to the main flow direction due to the oblique formation of the second Valve seat 62, the exhaust is smoothly deflected and passes through the first valve seat 60 from the inlet space 32, bypassing the heat exchanger 12 directly into the outlet space 42 and thus to the outlet opening 44. A vortex formation, which would lead to an increased pressure loss is avoided as much as possible.

Entsprechend kann der zweite Ventilsitz 62 mittels des Kragens 64 mit geringem Aufwand und ohne notwendige mechanische Bearbeitung des Mischgehäuses 10 über die Flanschplatte 38 zur Bypassklappe 56 ausgerichtet werden, wobei Druckverluste in der Abgasführung reduziert werden.Accordingly, the second valve seat 62 can be aligned by means of the collar 64 with little effort and without necessary mechanical processing of the mixing housing 10 via the flange plate 38 to the bypass valve 56, wherein pressure losses are reduced in the exhaust system.

Es sollte deutlich sein, dass der Schutzbereich nicht auf das beschriebene Ausführungsbeispiel beschränkt ist. So sind verschiedene konstruktive Änderungen ebenso denkbar, wie eine andere Befestigung des Kragens an der Flanschplatte oder die Verwendung anders aufgebauter Wärmetauscher, wie beispielsweise Druckgusskühler mit einem Innengehäuse und einem Außengehäuse oder i-förmig durchströmter Kühler. Auch ist eine Ausrichtung und somit noch genauere Positionierung des Mischgehäuses zum Wärmetauscher und somit zum Kragen über zusätzliche Passstifte ausführbar, ohne den Schutzbereich des Hauptanspruchs zu verlassen.It should be clear that the scope of protection is not limited to the embodiment described. Thus, various structural changes are just as conceivable, as another attachment of the collar to the flange plate or the use of different construction Heat exchangers, such as die-cast cooler with an inner housing and an outer housing or radiator flowed through in an I-shaped. Also, an alignment and thus even more accurate positioning of the mixing housing to the heat exchanger and thus to the collar on additional dowel pins executable without departing from the scope of the main claim.

Claims (12)

  1. A device for conducting exhaust gas in an internal combustion engine, comprising a heat exchanger (12) having an inner housing (39) and an outer housing (34),
    a bypass flap (56),
    a mixing housing (10), in which the bypass flap (56) is supported and which is fastened to the heat exchanger (12),
    a first valve seat (60), which is formed on the mixing housing (10) and on which the bypass flap (56) lies in the state in which the bypass is closed,
    a second valve seat (62), on which the bypass flap (56) lies in the state in which the heat exchanger (12) is closed,
    characterized in that
    a collar (64) that forms the second valve seat (62) is formed on the inner housing (39) of the heat exchanger (12).
  2. The device for conducting exhaust gas in an internal combustion engine as defined in claim 1, characterized in that the inner housing (39) comprises a flange plate (38) on which the collar (64) is formed.
  3. The device for conducting exhaust gas in an internal combustion engine as defined in claim 2, characterized in that the flange plate (38) axially delimits a coolant duct between the inner housing (39) and the outer housing (34).
  4. The device for conducting exhaust gas in an internal combustion engine as defined in claim 2 or 3, characterized in that the mixing housing (10) is fastened on the outer housing (34) of the heat exchanger (12) with interposition of the flange plate (38).
  5. The device for conducting exhaust gas in an internal combustion engine of one of the preceding claims, characterized in that the heat exchanger (12) is a tube bundle heat exchanger, whose tubes are fastened at openings (36) of the flange plate (38), which openings are formed corresponding to the tubes, wherein the collar (64) is fastened on the opposite side of the flange plate (38) and extends into the mixing housing (10).
  6. The device for conducting exhaust gas in an internal combustion engine of one of the preceding claims, characterized in that the bypass flap (56) is mounted eccentrically on a shaft (58) supported in the mixing housing (10), and, in the closed state, rests circumferentially on the respective valve seat (60, 62).
  7. The device for conducting exhaust gas in an internal combustion engine as defined in claim 6, characterized in that the heat exchanger (12) is adapted to be flown through along a U-shape, and the flange plate (38) forms an inlet (30) and an outlet (40) of the heat exchanger (12), the inlet (30) and the outlet (40) being arranged on opposite sides of the bearing of the shaft (58) of the bypass flap (56).
  8. The device for conducting exhaust gas in an internal combustion engine of one of the preceding claims, characterized in that openings (54) are formed in the mixing housing (10), into which positioning elements (48) extend that are arranged on the heat exchanger (12).
  9. The device for conducting exhaust gas in an internal combustion engine as defined in claim 2, characterized in that the screws (48), by means of which the flange plate (38) is fastened to the outer housing (34) of the heat exchanger (12), serve as positioning elements.
  10. The device for conducting exhaust gas in an internal combustion engine as defined in claim 8, characterized in that the mixing housing (10) is aligned with the heat exchanger (12) by means of register pins.
  11. The device for conducting exhaust gas in an internal combustion engine of one of the preceding claims, characterized in that a wall (66) which is formed on the side of the collar (64) averted from the outlet (40) of the heat exchanger (12), has a larger dimension than a wall (68) formed on the side facing towards the outlet (40) of the heat exchanger (12).
  12. The device for conducting exhaust gas in an internal combustion engine of one of the preceding claims, characterized in that an exhaust gas recirculation valve (16) is arranged in the mixing housing (10) upstream of the bypass flap (56), the outlet (26) of said valve being arranged opposite the inlet (30) of the heat exchanger (12).
EP13720363.4A 2012-05-25 2013-04-30 Device for conducting exhaust gas in an internal combustion engine Active EP2855909B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012104545.3A DE102012104545B4 (en) 2012-05-25 2012-05-25 Device for exhaust system in an internal combustion engine
PCT/EP2013/059027 WO2013174629A1 (en) 2012-05-25 2013-04-30 Device for conducting exhaust gas in an internal combustion engine

Publications (2)

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EP2855909A1 EP2855909A1 (en) 2015-04-08
EP2855909B1 true EP2855909B1 (en) 2016-03-30

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EP (1) EP2855909B1 (en)
DE (1) DE102012104545B4 (en)
ES (1) ES2572708T3 (en)
IN (1) IN2014DN07334A (en)
WO (1) WO2013174629A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016200371B4 (en) 2016-01-14 2018-12-13 Bayerische Motoren Werke Aktiengesellschaft Bypass flap for exhaust gas recirculation cooler

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61237998A (en) * 1985-04-15 1986-10-23 Toyo Radiator Kk Radiator for supercharger incorporating supercharged air bypassing device
FR2893363A1 (en) 2005-11-11 2007-05-18 Denso Corp VALVE AND DEVICE FOR RECYCLING EXHAUST GAS FOR AN ENGINE
JP5014032B2 (en) * 2007-09-10 2012-08-29 ダイハツ工業株式会社 Refrigerant exhaust gas cooling device for internal combustion engine

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DE102012104545A1 (en) 2013-11-28
IN2014DN07334A (en) 2015-04-24
WO2013174629A1 (en) 2013-11-28
DE102012104545B4 (en) 2014-05-15
ES2572708T3 (en) 2016-06-01
EP2855909A1 (en) 2015-04-08

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