EP2317093A2 - Device for cooling an exhaust gas stream - Google Patents
Device for cooling an exhaust gas stream Download PDFInfo
- Publication number
- EP2317093A2 EP2317093A2 EP10188159A EP10188159A EP2317093A2 EP 2317093 A2 EP2317093 A2 EP 2317093A2 EP 10188159 A EP10188159 A EP 10188159A EP 10188159 A EP10188159 A EP 10188159A EP 2317093 A2 EP2317093 A2 EP 2317093A2
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- European Patent Office
- Prior art keywords
- exhaust gas
- exhaust
- outlet nozzle
- exhaust pipe
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2270/00—Mixing air with exhaust gases
- F01N2270/02—Mixing air with exhaust gases for cooling exhaust gases or the apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
Definitions
- the invention relates to a device for cooling an exhaust gas stream, with an actuatable by the exhaust stream outlet nozzle, which projects into an open end of an adjacent exhaust pipe such that in a suction formed between the outlet and the exhaust pipe when passing the exhaust stream, a negative pressure relative to the environment generated is.
- soot particle filters usually with so-called wall-flow filters, in which the engine exhaust gas penetrates a porous filter wall of a ceramic or metallic material.
- soot particles contained in the engine exhaust are deposited on both the surface and in the interior of the filter wall, so that the exhaust gas back pressure increases with increasing degree of clogging of the filter wall.
- the deposited soot particles are burned at regular intervals, including the temperature of the engine exhaust gas - for example, by using a soot particle filter upstream oxidation catalyst - temporarily increased to temperatures above 600 ° C.
- a soot particle filter upstream oxidation catalyst - temporarily increased to temperatures above 600 ° C.
- the device attachable to the exhaust tailpipe by means of a clamp or clamp comprises a nozzle mounted to an adjacent diverter housing by means of a plurality of radially disposed support struts such that as the exhaust gas flow passes through an inlet formed between the nozzle and the diverter housing, a partial vacuum to the aspiration becomes cooler Generate ambient air.
- a partial vacuum to the aspiration becomes cooler Generate ambient air.
- the tapering in the direction of passage of the exhaust gas flow form of the nozzle or the deflector housing leads to an undesirable increase in the exhaust gas back pressure in the exhaust system.
- the device according to the invention for cooling an exhaust gas stream comprises an exhaust nozzle which can be acted upon by the exhaust gas stream and projects into an open end of an adjacent exhaust pipe such that a negative pressure relative to the environment can be generated in an intake region formed between the exhaust nozzle and the exhaust pipe when the exhaust gas stream passes. Furthermore, an adjusting means for changing the flow cross section of the outlet nozzle is provided.
- the generation of the negative pressure takes place according to the Venturi principle, wherein the outlet nozzle extends into the open end of the exhaust pipe and one dependent on the flow cross-section Vacuum generated in the intake. Depending on its temperature, the ambient air sucked into the exhaust pipe due to the negative pressure leads to a corresponding cooling of the exhaust gas flow.
- the flow cross section of the outlet nozzle can be increased by means of the actuating means such that an unhindered passage of the exhaust gas flow is possible. In this way, an undesirable increase in the exhaust gas backpressure can be limited to the regeneration phases of the soot particle filter.
- the device according to the invention is characterized by a particularly simple structure, so that there is the possibility to accommodate this space-saving in the range of the particulate filter within an engine compartment of a powered by a diesel engine motor vehicle, in particular an agricultural utility vehicle.
- the diesel engine is usually arranged in the engine compartment of the motor vehicle high temperature heat exchanger, which is part of a connected to the diesel engine liquid cooling circuit, the high-temperature heat exchanger is acted upon by a fan unit with cooling air, which is sucked in via a grille and downstream filter trays from the environment. Since the thus directed into the engine compartment air is largely free of impurities, an undesirable clogging of the suction formed between the outlet nozzle and the exhaust pipe is reliably avoided. additionally The resulting caused by the fan unit compression of the air in the engine compartment leads to an increased volume flow in the intake and thus to a more efficient cooling of the exhaust stream.
- the change in the flow cross section of the outlet nozzle preferably takes place as a function of the exhaust gas temperature.
- an enlargement of the flow cross-section caused by the adjusting means may be provided in the case of exhaust gas temperatures typically occurring during a regeneration phase of the soot particle filter.
- the outlet nozzle may have a plurality of flexible blades for changing the flow cross-section.
- the lamellae are formed, for example, in the form of finger-shaped baffles which are an integral part of an attachment strip which can be attached to an outlet connection of the soot particle filter, the guide plates projecting in the mounted state in the direction of the exhaust gas flow.
- the outlet nozzle is an integral part of a filter housing enclosed by the soot particle filter and welded or otherwise firmly connected thereto.
- the lamellae can be designed, in particular, as bimetallic elements, which occupy a bend which reduces the flow cross section of the outlet nozzle with increasing exhaust gas temperature.
- the bimetallic elements at the same time form an actuating means for the temperature-dependent change of the flow cross section of the outlet nozzle.
- the structure of such bimetallic elements is basically known. Accordingly, these consist of a metal strip having two interconnected metal layers with different coefficients of linear expansion.
- the fins are preferably designed such that they lie against the open end of the exhaust pipe when falling below a predetermined threshold for the exhaust gas temperature threshold.
- the slats take in this case a fully open position.
- the specification of the threshold value is such that it is below the exhaust gas temperatures typically occurring during the regeneration phase of the soot particle filter in the range of 400 to 600 ° C.
- a limiting means for conditioning the slats is provided at the open end of the exhaust pipe.
- the limiting means may be formed in the shape of a circumferential along the inside of the open end of the exhaust pipe stop lip.
- the stop lip is, for example, a bead formed on the open end of the exhaust pipe.
- a heat-resistant seal in the form of a braided glass or ceramic fiber cord can be introduced into the bead.
- the lamellae may be arranged in the circumferential direction of the outlet nozzle in an overlapping manner in the form of an aperture. Due to the overlap, an undesirable release of exhaust gases in the region of the outlet nozzle is reliably avoided.
- the exhaust pipe is at least partially surrounded by a contact protection.
- the contact protection in particular has the shape of a tubular cover, which is attached by means of a plurality of spacers along the outside of the exhaust pipe.
- the tubular cover may, at least in the region of a tailpipe exhaust having a plurality of openings, which allow a circulation of existing between the exhaust pipe and the tubular cover air.
- Fig. 1 shows an overall perspective view of an embodiment of the inventive device for cooling an exhaust gas flow exiting from a soot particulate filter on an agricultural utility vehicle, wherein Fig. 2 respectively.
- Fig. 3 a detailed view of the in Fig. 1 illustrated embodiment of the device according to the invention during or outside a regeneration phase of the particulate filter reproduces.
- the agricultural utility vehicle 10 embodied as a tractor by way of example comprises a soot particle filter 14 housed in an engine compartment 12, which is designed as a conventional wall-flow filter in which the engine exhaust gas produced by a diesel engine 16 of the agricultural utility vehicle 10 penetrates a porous filter wall of a ceramic or metallic material.
- the soot particles contained in the engine exhaust are deposited here both on the surface and in the interior of the filter wall of the soot particle filter 14. Since the exhaust backpressure increases with increasing degree of clogging of the filter wall, the deposited soot particles are burned at regular intervals for regeneration of the soot particle filter 14, for which the temperature of the engine exhaust gas is temporarily increased to temperatures above 600 ° C. by using an oxidation catalytic converter upstream of the soot particle filter 14.
- the device 20 For cooling the exhaust gas stream 18 emerging from the soot particle filter 14 and heated during the regeneration phase, the device 20 according to the invention comprises an outlet nozzle 22 formed on the soot particle filter 14 for leading out the filtered exhaust gas stream 18.
- the generation of the negative pressure takes place according to the Venturi principle, wherein the outlet nozzle 24 extends into the open end 26 of the exhaust pipe 28 and generates a dependent on the respective flow cross-section vacuum in the intake region 30.
- the ambient air 34 sucked into the exhaust pipe 28 due to the negative pressure in this case leads, depending on its temperature, to a corresponding cooling of the exhaust gas flow 18.
- the outlet nozzle 24 for changing the flow cross-section on a plurality of flexible blades 36 which are arranged in the circumferential direction of the outlet nozzle 24 in an overlapping aperture.
- the lamellae 36 are designed in the form of finger-shaped baffles which are an integral part of a fastening strip 40 attached to the outlet connection 22 by means of a clamping screw 38, the guide plates projecting in the mounted state in the direction of the exhaust gas flow 18.
- the outlet port 22 is in this case an integral part of a filter housing 42 enclosed by the soot particle filter 14 and welded or otherwise firmly connected thereto.
- the lamellae 36 are designed, for example, as bimetallic elements which occupy a bend which reduces the flow cross-section of the outlet nozzle 24 with increasing exhaust-gas temperature.
- the bimetallic elements at the same time form an actuating means 44 for changing the flow cross section of the outlet nozzle 24 as a function of the exhaust gas temperature.
- the lamellae 36 are designed such that they lie against the open end 26 of the exhaust pipe 28 when it falls below a threshold value set for the exhaust gas temperature.
- the fins 36 in this case occupy a fully open position to allow unhindered passage of the exhaust flow 18. This condition is in Fig. 3 shown.
- the specification of the threshold value is such that it is below the exhaust gas temperatures typically occurring during the regeneration phase of the soot particle filter 14 in the range of 400 to 600 ° C.
- a limiting means 46 for supporting the fins 36 is provided.
- the limiting means 46 is configured in the form of a stop lip 50 running along an inner side 48 of the open end 26 of the exhaust pipe 28.
- the stop lip 50 is a flanging formed on the open end 26 of the exhaust pipe 28.
- a heat-resistant seal 52 is introduced in the form of a braided glass or ceramic fiber cord.
- Fig. 1 is the exhaust pipe 28 at least partially surrounded by a contact protection 54.
- the contact guard 54 has the shape of a tubular cover 56, which is attached by means of a plurality of spacers, not shown, along the outside of the exhaust pipe 28.
- the tubular cover 56 at least in the region of a tailpipe 58 on a plurality of openings 60, which allow a circulation of the present between the exhaust pipe 28 and the tubular cover 56 air.
- the illustrated agricultural vehicle 10 is a tractor, a use of the device 20 according to the invention also in any other, powered by a diesel engine motor vehicles conceivable. In addition, it is also suitable for use in stationary applications, such as a generator driven by a diesel engine or the like.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Kühlung eines Abgasstroms, mit einer mittels des Abgasstroms beaufschlagbaren Auslassdüse, die derart in ein offenes Ende eines angrenzenden Abgasrohrs hineinragt, dass in einem zwischen der Auslassdüse und dem Abgasrohr gebildeten Ansaugbereich bei Hindurchtreten des Abgasstroms ein Unterdruck gegenüber der Umgebung erzeugbar ist.The invention relates to a device for cooling an exhaust gas stream, with an actuatable by the exhaust stream outlet nozzle, which projects into an open end of an adjacent exhaust pipe such that in a suction formed between the outlet and the exhaust pipe when passing the exhaust stream, a negative pressure relative to the environment generated is.
Die von der Europäischen Union erlassenen Abgasnormen sehen eine schrittweise Reduzierung der von Dieselmotoren erzeugten und mit dem Motorabgas in die Umgebung ausgestoßenen Rußpartikel vor. Die Beschränkung des Rußpartikelausstoßes erfolgt durch Verwendung von Rußpartikelfiltern, in der Regel mit sogenannten Wandstromfiltern, bei denen das Motorabgas eine poröse Filterwand aus einem keramischen oder metallischen Werkstoff durchdringt. Die im Motorabgas enthaltenen Rußpartikel lagern sich hierbei sowohl auf der Oberfläche als auch im Inneren der Filterwand ab, sodass der Abgasgegendruck mit zunehmendem Zusetzungsgrad der Filterwand ansteigt. Zur Regeneration des Rußpartikelfilters werden daher in regelmäßigen Zeitabständen die abgelagerten Rußpartikel abgebrannt, wozu die Temperatur des Motorabgases - beispielsweise durch Verwendung eines dem Rußpartikelfilter vorgeschalteten Oxidationskatalysators - zeitweise auf Temperaturen über 600 °C erhöht wird. Während der Regenerationsphasen des Rußpartikelfilters können am Auspuffendrohr der Abgasanlage dementsprechend hohe Abgastemperaturen auftreten, die gegebenenfalls eine Gefahr für umliegende Fahrzeugkomponenten, Gegenstände oder Personen darstellen.The emission standards adopted by the European Union provide for a gradual reduction in soot particles produced by diesel engines and emitted into the environment with engine exhaust. The limitation of soot particle emissions is achieved by using soot particle filters, usually with so-called wall-flow filters, in which the engine exhaust gas penetrates a porous filter wall of a ceramic or metallic material. The soot particles contained in the engine exhaust are deposited on both the surface and in the interior of the filter wall, so that the exhaust gas back pressure increases with increasing degree of clogging of the filter wall. For the regeneration of the particulate filter, therefore, the deposited soot particles are burned at regular intervals, including the temperature of the engine exhaust gas - for example, by using a soot particle filter upstream oxidation catalyst - temporarily increased to temperatures above 600 ° C. During the regeneration phases of the soot particle filter, correspondingly high exhaust gas temperatures can occur at the exhaust end pipe of the exhaust system, which possibly represent a danger to surrounding vehicle components, objects or persons.
Vor diesem Hintergrund geht aus der
Es ist daher Aufgabe der vorliegenden Erfindung, eine Vorrichtung der eingangs genannten Art zu schaffen, die es ermöglicht, eine unerwünschte Erhöhung des Abgasgegendrucks zumindest auf die Regenerationsphasen des Rußpartikelfilters zu beschränken.It is therefore an object of the present invention to provide a device of the type mentioned, which makes it possible to limit an undesirable increase in the exhaust back pressure at least on the regeneration phases of the particulate filter.
Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a device having the features of patent claim 1.
Die erfindungsgemäße Vorrichtung zur Kühlung eines Abgasstroms umfasst eine mittels des Abgasstroms beaufschlagbare Auslassdüse, die derart in ein offenes Ende eines angrenzenden Abgasrohrs hineinragt, dass in einem zwischen der Auslassdüse und dem Abgasrohr gebildeten Ansaugbereich bei Hindurchtreten des Abgasstroms ein Unterdruck gegenüber der Umgebung erzeugbar ist. Des Weiteren ist ein Stellmittel zur Veränderung des Strömungsquerschnitts der Auslassdüse vorgesehen.The device according to the invention for cooling an exhaust gas stream comprises an exhaust nozzle which can be acted upon by the exhaust gas stream and projects into an open end of an adjacent exhaust pipe such that a negative pressure relative to the environment can be generated in an intake region formed between the exhaust nozzle and the exhaust pipe when the exhaust gas stream passes. Furthermore, an adjusting means for changing the flow cross section of the outlet nozzle is provided.
Genauer gesagt erfolgt die Erzeugung des Unterdrucks nach dem Venturiprinzip, wobei sich die Auslassdüse in das offene Ende des Abgasrohrs erstreckt und einen vom Strömungsquerschnitt abhängigen Unterdruck im Ansaugbereich erzeugt. Die aufgrund des Unterdrucks in das Abgasrohr gesaugte Umgebungsluft führt hierbei je nach ihrer Temperatur zu einer entsprechenden Abkühlung des Abgasstroms.More specifically, the generation of the negative pressure takes place according to the Venturi principle, wherein the outlet nozzle extends into the open end of the exhaust pipe and one dependent on the flow cross-section Vacuum generated in the intake. Depending on its temperature, the ambient air sucked into the exhaust pipe due to the negative pressure leads to a corresponding cooling of the exhaust gas flow.
Da eine Beimischung kühlerer Umgebungsluft ausschließlich während der Regenerationsphasen des Rußpartikelfilters erforderlich ist, kann während der übrigen Betriebsphasen des Rußpartikelfilters der Strömungsquerschnitt der Auslassdüse mittels des Stellmittels derart vergrößert werden, dass ein ungehindertes Passieren des Abgasstroms möglich ist. Auf diese Weise lässt sich eine unerwünschte Erhöhung des Abgasgegendrucks auf die Regenerationsphasen des Rußpartikelfilters beschränken.Since an admixture of cooler ambient air is required exclusively during the regeneration phases of the soot particle filter, during the remaining operating phases of the soot particle filter, the flow cross section of the outlet nozzle can be increased by means of the actuating means such that an unhindered passage of the exhaust gas flow is possible. In this way, an undesirable increase in the exhaust gas backpressure can be limited to the regeneration phases of the soot particle filter.
Die erfindungsgemäße Vorrichtung zeichnet sich durch einen besonders einfachen Aufbau aus, sodass die Möglichkeit besteht, diese platzsparend im Bereich des Rußpartikelfilters innerhalb eines Motorraums eines von einem Dieselmotor betriebenen Kraftfahrzeugs, insbesondere eines landwirtschaftlichen Nutzfahrzeugs, unterzubringen. Zur Kühlung des Dieselmotors dient üblicherweise ein im Motorraum des Kraftfahrzeugs angeordneter Hochtemperaturwärmetauscher, der Bestandteil eines mit dem Dieselmotor in Verbindung stehenden Flüssigkeitskühlkreislaufs ist, wobei der Hochtemperaturwärmetauscher mittels eines Lüfteraggregats mit Kühlluft beaufschlagt wird, die über einen Kühlergrill sowie nachgeordnete Filtereinschübe aus der Umgebung angesaugt wird. Da die solchermaßen in den Motorraum geleitete Luft weitgehend frei von Verunreinigungen ist, wird ein unerwünschtes Zusetzen des zwischen der Auslassdüse und dem Abgasrohr ausgebildeten Ansaugbereichs zuverlässig vermieden. Zusätzlich führt die seitens des Lüfteraggregats hervorgerufene Verdichtung der im Motorraum befindlichen Luft zu einem erhöhten Volumenstrom im Ansaugbereich und damit zu einer effizienteren Kühlung des Abgasstroms.The device according to the invention is characterized by a particularly simple structure, so that there is the possibility to accommodate this space-saving in the range of the particulate filter within an engine compartment of a powered by a diesel engine motor vehicle, in particular an agricultural utility vehicle. For cooling the diesel engine is usually arranged in the engine compartment of the motor vehicle high temperature heat exchanger, which is part of a connected to the diesel engine liquid cooling circuit, the high-temperature heat exchanger is acted upon by a fan unit with cooling air, which is sucked in via a grille and downstream filter trays from the environment. Since the thus directed into the engine compartment air is largely free of impurities, an undesirable clogging of the suction formed between the outlet nozzle and the exhaust pipe is reliably avoided. additionally The resulting caused by the fan unit compression of the air in the engine compartment leads to an increased volume flow in the intake and thus to a more efficient cooling of the exhaust stream.
Vorteilhafte Weiterbildungen gehen aus den Unteransprüchen hervor.Advantageous developments will become apparent from the dependent claims.
Vorzugsweise erfolgt die Veränderung des Strömungsquerschnitts der Auslassdüse in Abhängigkeit der Abgastemperatur. Insbesondere kann eine durch das Stellmittel bewirkte Vergrößerung des Strömungsquerschnitts im Falle von während einer Regenerationsphase des Rußpartikelfilters typischerweise auftretenden Abgastemperaturen vorgesehen sein.The change in the flow cross section of the outlet nozzle preferably takes place as a function of the exhaust gas temperature. In particular, an enlargement of the flow cross-section caused by the adjusting means may be provided in the case of exhaust gas temperatures typically occurring during a regeneration phase of the soot particle filter.
Die Auslassdüse kann zur Veränderung des Strömungsquerschnitts eine Vielzahl biegsamer Lamellen aufweisen. Die Lamellen sind beispielsweise in Gestalt fingerförmiger Leitbleche ausgebildet, die einstückiger Bestandteil eines an einem Auslassstutzen des Rußpartikelfilters anbringbaren Befestigungsstreifens sind, wobei die Leitbleche in montiertem Zustand in Richtung des Abgasstroms abragen. Der Auslassstutzen ist insbesondere fester Bestandteil eines von dem Rußpartikelfilter umfassten Filtergehäuses und mit diesem verschweißt oder auf andere Weise fest verbunden.The outlet nozzle may have a plurality of flexible blades for changing the flow cross-section. The lamellae are formed, for example, in the form of finger-shaped baffles which are an integral part of an attachment strip which can be attached to an outlet connection of the soot particle filter, the guide plates projecting in the mounted state in the direction of the exhaust gas flow. In particular, the outlet nozzle is an integral part of a filter housing enclosed by the soot particle filter and welded or otherwise firmly connected thereto.
Die Lamellen können insbesondere als Bimetallelemente ausgebildet sein, die eine den Strömungsquerschnitt der Auslassdüse mit zunehmender Abgastemperatur verringernde Biegung einnehmen. Mit anderen Worten bilden die Bimetallelemente zugleich ein Stellmittel zur temperaturabhängigen Veränderung des Strömungsquerschnitts der Auslassdüse. Der Aufbau derartiger Bimetallelemente ist grundsätzlich bekannt. Demgemäß bestehen diese aus einem Metallstreifen, der zwei miteinander verbundene Metallschichten mit unterschiedlichen Längenausdehnungskoeffizienten aufweist.The lamellae can be designed, in particular, as bimetallic elements, which occupy a bend which reduces the flow cross section of the outlet nozzle with increasing exhaust gas temperature. In other words, the bimetallic elements at the same time form an actuating means for the temperature-dependent change of the flow cross section of the outlet nozzle. The structure of such bimetallic elements is basically known. Accordingly, these consist of a metal strip having two interconnected metal layers with different coefficients of linear expansion.
Die Lamellen sind vorzugsweise derart ausgebildet, dass diese bei Unterschreiten eines für die Abgastemperatur vorgegebenen Schwellenwerts am offenen Ende des Abgasrohrs anliegen. Die Lamellen nehmen in diesem Fall eine vollständig geöffnete Position ein. Die Vorgabe des Schwellenwerts erfolgt derart, dass dieser unterhalb der während der Regenerationsphase des Rußpartikelfilters typischerweise auftretenden Abgastemperaturen im Bereich von 400 bis 600 °C liegt.The fins are preferably designed such that they lie against the open end of the exhaust pipe when falling below a predetermined threshold for the exhaust gas temperature threshold. The slats take in this case a fully open position. The specification of the threshold value is such that it is below the exhaust gas temperatures typically occurring during the regeneration phase of the soot particle filter in the range of 400 to 600 ° C.
Hierbei besteht die Möglichkeit, dass an dem offenen Ende des Abgasrohrs ein Begrenzungsmittel zur Anlage der Lamellen vorgesehen ist. Das Begrenzungsmittel kann in Gestalt einer entlang der Innenseite des offenen Endes des Abgasrohrs umlaufenden Anschlaglippe ausgebildet sein. Bei der Anschlaglippe handelt es sich beispielsweise um eine am offenen Ende des Abgasrohrs ausgeformte Umbördelung. In die Umbördelung kann zusätzlich eine hitzebeständige Dichtung in Gestalt einer geflochtenen Glas-oder Keramikfaserschnur eingebracht sein.In this case, there is the possibility that at the open end of the exhaust pipe, a limiting means for conditioning the slats is provided. The limiting means may be formed in the shape of a circumferential along the inside of the open end of the exhaust pipe stop lip. The stop lip is, for example, a bead formed on the open end of the exhaust pipe. In addition, a heat-resistant seal in the form of a braided glass or ceramic fiber cord can be introduced into the bead.
Des Weiteren können die Lamellen in umfangsmäßiger Richtung der Auslassdüse blendenförmig überlappend angeordnet sein. Aufgrund der Überlappung wird eine unerwünschte Freisetzung von Abgasen im Bereich der Auslassdüse zuverlässig vermieden.Furthermore, the lamellae may be arranged in the circumferential direction of the outlet nozzle in an overlapping manner in the form of an aperture. Due to the overlap, an undesirable release of exhaust gases in the region of the outlet nozzle is reliably avoided.
Vorzugsweise ist das Abgasrohr zumindest abschnittsweise von einem Berührungsschutz umgeben. Der Berührungsschutz weist insbesondere die Gestalt einer rohrförmigen Abdeckung auf, die mittels mehrerer Abstandshalter entlang der Außenseite des Abgasrohrs angebracht ist. Um eine übermäßige Erhitzung des Abgasrohrs zu vermeiden, kann die rohrförmige Abdeckung zumindest im Bereich eines Auspuffendrohrs eine Vielzahl von Öffnungen aufweisen, die eine Zirkulation der zwischen dem Abgasrohr und der rohrförmigen Abdeckung vorhandenen Luft ermöglichen.Preferably, the exhaust pipe is at least partially surrounded by a contact protection. The contact protection in particular has the shape of a tubular cover, which is attached by means of a plurality of spacers along the outside of the exhaust pipe. In order to avoid excessive heating of the exhaust pipe, the tubular cover may, at least in the region of a tailpipe exhaust having a plurality of openings, which allow a circulation of existing between the exhaust pipe and the tubular cover air.
Die erfindungsgemäße Vorrichtung wird im Folgenden anhand der beigefügten Zeichnungen näher erläutert. Dabei sind hinsichtlich ihrer Funktion übereinstimmende bzw. vergleichbare Bauteile mit denselben Bezugszeichen gekennzeichnet. Es zeigen:
- Fig. 1
- eine perspektivische Gesamtansicht eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Kühlung eines aus einem Rußpartikelfilter austretenden Abgasstroms an einem landwirtschaftlichen Nutzfahrzeug,
- Fig. 2
- eine Detailansicht des in
Fig. 1 dargestellten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung während einer Regenerationsphase des Rußpartikelfilters, und - Fig. 3
- eine Detailansicht des in
Fig. 1 dargestellten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung außerhalb einer Regenerationsphase des Rußpartikelfilters.
- Fig. 1
- 3 shows an overall perspective view of an exemplary embodiment of the device according to the invention for cooling an exhaust gas flow emerging from a soot particle filter on an agricultural utility vehicle.
- Fig. 2
- a detailed view of the in
Fig. 1 illustrated embodiment of the device according to the invention during a regeneration phase of the particulate filter, and - Fig. 3
- a detailed view of the in
Fig. 1 illustrated embodiment of the device according to the invention outside a regeneration phase of the particulate filter.
Das beispielsgemäß als Traktor ausgebildete landwirtschaftliche Nutzfahrzeug 10 umfasst einen in einem Motorraum 12 untergebrachten Rußpartikelfilter 14, wobei dieser als herkömmlicher Wandstromfilter ausgebildet ist, bei dem das von einem Dieselmotor 16 des landwirtschaftlichen Nutzfahrzeugs 10 erzeugte Motorabgas eine poröse Filterwand aus einem keramischen oder metallischen Werkstoff durchdringt. Die im Motorabgas enthaltenen Rußpartikel lagern sich hierbei sowohl auf der Oberfläche als auch im Inneren der Filterwand des Rußpartikelfilters 14 ab. Da der Abgasgegendruck mit zunehmendem Zusetzungsgrad der Filterwand ansteigt, werden die abgelagerten Rußpartikel zur Regeneration des Rußpartikelfilters 14 in regelmäßigen Zeitabständen verbrannt, wozu die Temperatur des Motorabgases durch Verwendung eines dem Rußpartikelfilter 14 vorgeschalteten Oxidationskatalysators zeitweise auf Temperaturen über 600 °C erhöht wird.The
Zur Kühlung des aus dem Rußpartikelfilter 14 austretenden und während der Regenerationsphase erhitzten Abgasstroms 18 umfasst die erfindungsgemäße Vorrichtung 20 einen an dem Rußpartikelfilter 14 ausgebildeten Auslassstutzen 22 zum Herausführen des gefilterten Abgasstroms 18. Eine am Auslassstutzen 22 angebrachte und vom Abgasstrom 18 beaufschlagte Auslassdüse 24 ragt derart in ein offenes Ende 26 eines angrenzenden Abgasrohrs 28 hinein, dass in einem zwischen der Auslassdüse 24 und dem Abgasrohr 28 gebildeten Ansaugbereich 30 bei Hindurchtreten des Abgasstroms 18 ein Unterdruck gegenüber der Umgebung 32 erzeugbar ist. Dieser Zustand ist in
Genauer gesagt erfolgt die Erzeugung des Unterdrucks nach dem Venturiprinzip, wobei sich die Auslassdüse 24 in das offene Ende 26 des Abgasrohrs 28 erstreckt und einen vom jeweiligen Strömungsquerschnitt abhängigen Unterdruck im Ansaugbereich 30 erzeugt. Die aufgrund des Unterdrucks in das Abgasrohr 28 gesaugte Umgebungsluft 34 führt hierbei je nach ihrer Temperatur zu einer entsprechenden Abkühlung des Abgasstroms 18.More specifically, the generation of the negative pressure takes place according to the Venturi principle, wherein the
Des Weiteren weist die Auslassdüse 24 zur Veränderung des Strömungsquerschnitts eine Vielzahl biegsamer Lamellen 36 auf, die in umfangsmäßiger Richtung der Auslassdüse 24 blendenförmig überlappend angeordnet sind. Die Lamellen 36 sind in Gestalt fingerförmiger Leitbleche ausgebildet, die einstückiger Bestandteil eines am Auslassstutzen 22 mittels einer Spannschraube 38 angebrachten Befestigungsstreifens 40 sind, wobei die Leitbleche in montiertem Zustand in Richtung des Abgasstroms 18 abragen. Der Auslassstutzen 22 ist hierbei fester Bestandteil eines von dem Rußpartikelfilter 14 umfassten Filtergehäuses 42 und mit diesem verschweißt oder auf andere Weise fest verbunden.Furthermore, the
Die Lamellen 36 sind beispielsgemäß als Bimetallelemente ausgebildet, die eine den Strömungsquerschnitt der Auslassdüse 24 mit zunehmender Abgastemperatur verringernde Biegung einnehmen. Mit anderen Worten bilden die Bimetallelemente zugleich ein Stellmittel 44 zur Veränderung des Strömungsquerschnitts der Auslassdüse 24 in Abhängigkeit der Abgastemperatur.The
Ferner sind die Lamellen 36 derart ausgebildet, dass diese bei Unterschreiten eines für die Abgastemperatur vorgegebenen Schwellenwerts am offenen Ende 26 des Abgasrohrs 28 anliegen. Die Lamellen 36 nehmen in diesem Fall eine vollständig geöffnete Position ein, um ein ungehindertes Passieren des Abgasstroms 18 zu ermöglichen. Dieser Zustand ist in
Die Vorgabe des Schwellenwerts erfolgt derart, dass dieser unterhalb der während der Regenerationsphase des Rußpartikelfilters 14 typischerweise auftretenden Abgastemperaturen im Bereich von 400 bis 600 °C liegt.The specification of the threshold value is such that it is below the exhaust gas temperatures typically occurring during the regeneration phase of the
An dem offenen Ende 26 des Abgasrohrs 28 ist ein Begrenzungsmittel 46 zur Anlage der Lamellen 36 vorgesehen. Das Begrenzungsmittel 46 ist in Gestalt einer entlang einer Innenseite 48 des offenen Endes 26 des Abgasrohrs 28 umlaufenden Anschlaglippe 50 ausgebildet. Bei der Anschlaglippe 50 handelt es sich beispielsgemäß um eine am offenen Ende 26 des Abgasrohrs 28 ausgeformte Umbördelung. In die Umbördelung ist zusätzlich eine hitzebeständige Dichtung 52 in Gestalt einer geflochtenen Glas- oder Keramikfaserschnur eingebracht.At the
Gemäß
Auch wenn es sich bei dem in
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009046253A DE102009046253A1 (en) | 2009-10-30 | 2009-10-30 | Device for cooling an exhaust gas flow |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2317093A2 true EP2317093A2 (en) | 2011-05-04 |
EP2317093A3 EP2317093A3 (en) | 2013-04-17 |
Family
ID=43530125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10188159.7A Withdrawn EP2317093A3 (en) | 2009-10-30 | 2010-10-20 | Device for cooling an exhaust gas stream |
Country Status (5)
Country | Link |
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US (1) | US20110099990A1 (en) |
EP (1) | EP2317093A3 (en) |
CN (1) | CN102052134A (en) |
BR (1) | BRPI1013480A2 (en) |
DE (1) | DE102009046253A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2730764A1 (en) * | 2011-07-09 | 2014-05-14 | Unicarriers Corporation | Pipe joint structure for exhaust gas processing device for industrial vehicle |
Families Citing this family (12)
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US8935918B2 (en) * | 2010-04-23 | 2015-01-20 | GM Global Technology Operations LLC | Reconfigurable mixer for an exhaust aftertreatment system and method of using the same |
JP5886551B2 (en) * | 2011-07-19 | 2016-03-16 | コベルコ建機株式会社 | Exhaust structure of construction machinery |
DE102011087675A1 (en) * | 2011-12-02 | 2013-06-06 | Deere & Company | Cooling system for active cooling of an exhaust system |
US8720195B2 (en) | 2012-02-14 | 2014-05-13 | Deere & Company | Exhaust assembly |
IN2013DE01689A (en) * | 2013-06-05 | 2015-07-10 | Caterpillar Global Mining Expanded Products Pty Ltd | |
US9140172B2 (en) * | 2013-07-30 | 2015-09-22 | GM Global Technology Operations LLC | Gas flow distributing flexible coupling |
CN104165081A (en) * | 2014-07-21 | 2014-11-26 | 昆山晋桦豹胶轮车制造有限公司 | Off-gas dilution device of anti-explosion transportation vehicle with rubber wheels |
DE102017200684B4 (en) | 2017-01-17 | 2022-08-04 | Ford Global Technologies, Llc | Temperature control device |
WO2019068313A1 (en) * | 2017-10-03 | 2019-04-11 | Volvo Lastvagnar Ab | Process consisting in cooling at least one component, such as a sensor, arranged within a compartment of an exhaust after treatment system of a vehicle |
CN113123740A (en) * | 2019-12-30 | 2021-07-16 | 四川宏华石油设备有限公司 | Drilling fluid cooling system |
JP2023051491A (en) | 2021-09-30 | 2023-04-11 | 株式会社クボタ | Service vehicle |
EP4361410A1 (en) * | 2022-10-26 | 2024-05-01 | Kubota Corporation | Work vehicle |
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2009
- 2009-10-30 DE DE102009046253A patent/DE102009046253A1/en not_active Withdrawn
-
2010
- 2010-09-02 US US12/874,623 patent/US20110099990A1/en not_active Abandoned
- 2010-10-20 EP EP10188159.7A patent/EP2317093A3/en not_active Withdrawn
- 2010-10-28 BR BRPI1013480-8A patent/BRPI1013480A2/en not_active IP Right Cessation
- 2010-10-29 CN CN2010105313930A patent/CN102052134A/en active Pending
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US3143293A (en) * | 1961-04-13 | 1964-08-04 | Universal Oil Prod Co | Variable-area nozzle |
WO2008060559A2 (en) | 2006-11-14 | 2008-05-22 | Tenneco Automotive Operating Company, Inc. | Device for lowering tail pipe exhaust temperature |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2730764A1 (en) * | 2011-07-09 | 2014-05-14 | Unicarriers Corporation | Pipe joint structure for exhaust gas processing device for industrial vehicle |
EP2730764A4 (en) * | 2011-07-09 | 2015-02-25 | Unicarriers Corp | Pipe joint structure for exhaust gas processing device for industrial vehicle |
Also Published As
Publication number | Publication date |
---|---|
EP2317093A3 (en) | 2013-04-17 |
BRPI1013480A2 (en) | 2014-02-04 |
US20110099990A1 (en) | 2011-05-05 |
CN102052134A (en) | 2011-05-11 |
DE102009046253A1 (en) | 2011-05-05 |
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