EP2785993B1 - Cooling system for actively cooling an exhaust gas system - Google Patents

Cooling system for actively cooling an exhaust gas system Download PDF

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Publication number
EP2785993B1
EP2785993B1 EP12797834.4A EP12797834A EP2785993B1 EP 2785993 B1 EP2785993 B1 EP 2785993B1 EP 12797834 A EP12797834 A EP 12797834A EP 2785993 B1 EP2785993 B1 EP 2785993B1
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EP
European Patent Office
Prior art keywords
air
cooling
exhaust pipe
exhaust
cooling system
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EP12797834.4A
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German (de)
French (fr)
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EP2785993A1 (en
Inventor
Bernd Helferich
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Deere and Co
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Deere and Co
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Classifications

    • 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
    • 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
    • F01N13/14—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 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/143—Double-walled exhaust pipes or housings with air filling the space between both walls
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
    • 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
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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 cooling system for active cooling of an exhaust system, comprising an exhaust pipe for discharging an exhaust gas stream of an internal combustion engine and an air guide element which is arranged opposite the exhaust pipe to form an air duct to cool the exhaust pipe by supplying an air flow into the air duct.
  • exhaust aftertreatment systems are used in combustion power arrangements to reduce pollutant emissions.
  • the internal combustion engines in these arrangements can, for example, operate on the diesel principle. In certain operating conditions, the exhaust gases of these internal combustion engines can reach high temperatures.
  • the exhaust aftertreatment systems may include a diesel particulate filter (DPF) for filtering soot particulate emissions from the internal combustion engine.
  • DPF diesel particulate filter
  • the soot particles are deposited in the porous filter wall of the DPF, so that the exhaust backpressure increases with increasing degree of clogging of the DPF.
  • the deposited soot particles are burnt at regular intervals so that the degree of clogging decreases again.
  • the temperature of the engine exhaust gas stream is temporarily increased to temperatures of more than 600 ° C by appropriate measures.
  • correspondingly high surface temperatures can occur at the exhaust pipe of the exhaust system.
  • the exhaust pipe is part of an exhaust system of an agricultural machine, it is typically arranged so that an operator of the machine could come in contact with the exhaust pipe, which can result in burns at such high surface temperatures.
  • a hot exhaust pipe could cause a fire in an immediate environment, for example when parking the machine in a barn.
  • dirt deposited on the hot exhaust pipe can lead to uncontrolled spontaneous combustion of these deposits DE 1 027 084 is a jacketed exhaust pipe known.
  • the object of the present invention is to provide a largely independent of the driving speed cooling system for an exhaust system.
  • a cooling system for active cooling of an exhaust system comprising a soot particle filter, an exhaust pipe for discharging an exhaust gas stream of an internal combustion engine and an air guide element, which is arranged opposite the exhaust pipe to form an air duct, by supplying an air flow into the air duct the exhaust pipe cooling, wherein blowing means are provided which cause the supply of the air flow into the air duct and the exhaust pipe for cooling the exhaust gas stream downstream of the particulate filter has a first Venturi nozzle arrangement.
  • the fan means preferably compress the air flow to a pressure level which is higher than an ambient pressure. This ensures advantageously even at low speeds that a pressure gradient can be used to initiate the air flow in the air duct.
  • ambient pressure is the prevailing atmospheric air pressure.
  • the blower means lead a cooling exhaust air flow of the internal combustion engine as air flow to the air duct. It is advantageous that the air flow entering the air duct is already filtered, since it has already been passed as a cooling exhaust air stream of the internal combustion engine through a corresponding filter system of a cooling system of the internal combustion engine.
  • the air guide element has an air inlet opening to the air duct, wherein the air duct is connected via the air inlet opening with an engine compartment of the internal combustion engine for supplying the cooling exhaust air flow.
  • the engine compartment ensures that an increased pressure level can be set, which then can pass the cooling exhaust air flow through the air inlet opening in the air duct.
  • the engine compartment is an enclosure of the internal combustion engine, wherein the enclosure may consist of a hood and one or more trim parts, including the splashboard of a cab can count.
  • the engine compartment is encapsulated as far as possible air-tight except for an air supply opening to the fan unit and with the air inlet opening of the air duct corresponding air outlet opening.
  • the fan means preferably comprise a fan unit of a refrigeration cycle internal combustion engine. Since a cooling circuit of an internal combustion engine regularly has a fan unit, can advantageously by existing means, namely the fan unit in the form of a mechanically or electrically driven Cooling fan, the increased pressure level or the pressure gradient are generated in the direction of the exhaust system.
  • the air guide element has at least two outlet openings for the air duct, wherein the first outlet opening is arranged in the region of a mouth opening of the exhaust pipe and the second outlet opening is arranged upstream of the mouth opening. Due to the second outlet opening, an excessively high back pressure in the air duct is advantageously avoided.
  • the exhaust pipe has a first Venturi nozzle arrangement for the intake of air, which surrounds the exhaust pipe, wherein the air guide element forms an annular gap downstream of the first Venturi nozzle arrangement.
  • the annular gap between two outlet openings of the air guide elements is arranged. This ensures that over the second outlet opening any existing overpressure is reduced to a certain extent, so that no cooling air is blown off via the annular gap, but via the chimney effect, which adjusts downstream of the annular gap, further cooling air is sucked from the outside.
  • the annular gap is formed as a second Venturi nozzle arrangement for the intake of ambient air into the air duct.
  • the second Venturi nozzle arrangement in combination with the chimney effect, which adjusts downstream in the exhaust pipe, can be used to suck in ambient air to support the cooling.
  • FIG. 1 1 shows a detail of an agricultural utility vehicle 48 in the form of a tractor with a cab 50, a frame 52 and an only indicated internal combustion engine 16 with an exhaust system 12 for discharging an exhaust gas stream 22.
  • the internal combustion engine 16 is arranged within an engine compartment 34 in a conventional manner.
  • the exhaust system 16 comprises a soot particle filter 52, which is only indicated in its position, an exhaust pipe 14 and an air guide element 18 which encloses the exhaust pipe 14 to form an air duct 20.
  • the exhaust system 12 may include other components, not shown, such as one or more catalytic converters.
  • the internal combustion engine 16 has in a conventional manner via a likewise only indicated liquid cooling circuit 30 with a high-temperature heat exchanger, which is acted upon by means of a fan unit 28 with cooling air, which is sucked in via a grille and downstream filter trays from the environment.
  • a fan unit 28 With cooling air, which is sucked in via a grille and downstream filter trays from the environment.
  • the filter trays the guided into the engine compartment 34 cooling air is largely freed of impurities.
  • the caused by the fan assembly 28 compression of the cooling air leads to a relative to the atmospheric pressure increased pressure level of the cooling air in the engine compartment 34.
  • the guided through the high-temperature heat exchanger and the engine compartment 34 cooling air is asdeabluftstrom 26 for active cooling of the exhaust system 12 in the air duct 20, the by the formed as a jacket relative to the exhaust pipe 14 arranged air guide element 18 is initiated.
  • the exhaust gas pipe 14 has a first Venturi nozzle arrangement 42, as shown in FIG FIG. 2 can be seen.
  • the first venturi nozzle assembly 42 is formed by making the exhaust pipe 14 in two parts and the upstream exhaust pipe member 54 forms an orifice portion 56 which extends nozzle-shaped into the open end 58 of the downstream exhaust pipe member 60 of the exhaust pipe 14.
  • the Venturi nozzle arrangement 42 essentially has a circular cross section.
  • the air guide element 18 is designed in four parts in the illustrated embodiment, consisting of a motor-side protective cover 62, a two covers 64, 64 'comprehensive horizontal protective cover 66 and a vertical protective cover 68.
  • the number of parts from which the air guide element is formed, in others Embodiments of the invention vary.
  • the air guide element 18 surrounds the exhaust pipe 14 and thus forms with the exhaust pipe 14 an air duct 20.
  • the air duct 20 is connected via an air inlet opening 32 to the engine compartment 34.
  • the air inlet opening 32 is formed by an air gap 72 is formed between the exhaust pipe 14 and the side engine cover 70, which is covered with respect to the environment with the vertical protective cover 66 which is formed in a half-shell-shaped.
  • the two cover shells 64, 64 'of the horizontal protective cover 66 form in the assembled state the second outlet opening 38, which is directed down to the ground and is arranged on the downstream end of the protective cover 66. Characterized in that the second outlet opening 38 is directed downwards, both the sound and the warmchenabuftstrom is discharged downward towards the ground.
  • the transition region from the horizontal protective cover 66 to the vertical protective cover 68 forms an annular gap 44.
  • the annular gap 44 is configured as a second venturi arrangement 46.
  • the horizontal protective cover 66 has a downstream tapered mouth portion 74 which projects nozzle-shaped into the open end 76 of the vertical protective cover 68.
  • a suction region is formed between the mouth region 74 and the open end 76, in which a negative pressure relative to the environment is generated according to the venturi principle when a cooling exhaust air stream passes through the air duct 20, so that ambient air is drawn into the air duct 20.
  • the cooling exhaust air stream Via the outlet opening 36 in the region of the mouth opening 40 of the exhaust pipe 14, the cooling exhaust air stream enters the environment.
  • a filter element not shown in detail for example in the form of a perforated grid, be provided to retain mainly coarser impurities and prevent clogging of the air duct 20.
  • the air guide element 18 serves both as protection against contact for a hot exhaust pipe 14, in which it completely encases this, as well as the formation of an air duct 20 around the exhaust pipe 14, through which an actively introduced air flow ensures cooling.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Description

Die Erfindung betrifft ein Kühlsystem zur aktiven Kühlung eines Abgassystems, umfassend ein Abgasrohr zur Ableitung eines Abgasstroms einer Verbrennungskraftmaschine und ein Luftführungselement, das gegenüber dem Abgasrohr unter Bildung eines Luftführungskanals angeordnet ist, um durch Zuführen eines Luftstroms in den Luftführungskanal das Abgasrohr zu kühlen.The invention relates to a cooling system for active cooling of an exhaust system, comprising an exhaust pipe for discharging an exhaust gas stream of an internal combustion engine and an air guide element which is arranged opposite the exhaust pipe to form an air duct to cool the exhaust pipe by supplying an air flow into the air duct.

Infolge der heutigen Abgasgesetzgebung werden in Verbrennungskraftanordnungen Abgasnachbehandlungssysteme zur Reduzierung des Schadstoffausstoßes eingesetzt. Die Verbrennungskraftmaschinen in diesen Anordnungen können beispielsweise nach dem Dieselprinzip arbeiten. In bestimmten Betriebszuständen können die Abgase dieser Verbrennungskraftmaschinen hohe Temperaturen erreichen. So können die Abgasnachbehandlungssysteme beispielsweise einen Dieselpartikelfilter (DPF) zur Filterung des Rußpartikelausstoßes der Verbrennungskraftmaschine enthalten. Hierbei lagern sich die Rußpartikel in der porösen Filterwand des DPF ab, so dass der Abgasgegendruck mit zunehmendem Zusetzungsgrad des DPF ansteigt. Zur Regeneration des DPF werden in regelmäßigen Zeitabständen die abgelagerten Rußpartikel verbrannt, so dass der Zusetzungsgrad wieder abnimmt. Hierzu wird durch entsprechende Maßnahmen die Temperatur des Motorabgasstroms zeitweise auf Temperaturen von regelmäßig über 600°C erhöht. Hierbei können an dem Abgasrohr des Abgassystems entsprechend hohe Oberflächentemperaturen auftreten. Ist das Abgasrohr beispielsweise Teil eines Abgassystems einer landwirtschaftlichen Maschine, ist es in der Regel so angeordnet, dass eine Bedienperson der Maschine mit dem Abgasrohr in Berührung kommen könnte, was bei derart hohen Oberflächentemperaturen zu Verbrennungen führen kann. Weiterhin könnte ein derart heißes Abgasrohr in einer unmittelbaren Umgebung, beispielsweise beim Parken der Maschine in einer Scheune, einen Brand auslösen. Schließlich kann auf dem heißen Abgasrohr abgelagerter Schmutz zu unkontrollierten Selbstentzündungen dieser Ablagerungen führen.Aus der DE 1 027 084 ist ein ummanteltes Abgasrohr bekannt. Während des Fahrens nimmt geschwindigkeitsabhängig am Abgasrohr vorbeigeführte Frischluft zwischen dem Abgasrohr und der Ummantelung durch Konvektion vom Abgasrohr abgegebene Wärme auf und führt sie ins Freie. Weiterhin zeigen die DE 102 06 066 A1 und die DE 22 40 681 A1 derartige Anordnungen.As a result of today's emissions legislation, exhaust aftertreatment systems are used in combustion power arrangements to reduce pollutant emissions. The internal combustion engines in these arrangements can, for example, operate on the diesel principle. In certain operating conditions, the exhaust gases of these internal combustion engines can reach high temperatures. For example, the exhaust aftertreatment systems may include a diesel particulate filter (DPF) for filtering soot particulate emissions from the internal combustion engine. In this case, the soot particles are deposited in the porous filter wall of the DPF, so that the exhaust backpressure increases with increasing degree of clogging of the DPF. To regenerate the DPF, the deposited soot particles are burnt at regular intervals so that the degree of clogging decreases again. For this purpose, the temperature of the engine exhaust gas stream is temporarily increased to temperatures of more than 600 ° C by appropriate measures. In this case, correspondingly high surface temperatures can occur at the exhaust pipe of the exhaust system. For example, if the exhaust pipe is part of an exhaust system of an agricultural machine, it is typically arranged so that an operator of the machine could come in contact with the exhaust pipe, which can result in burns at such high surface temperatures. Furthermore, such a hot exhaust pipe could cause a fire in an immediate environment, for example when parking the machine in a barn. Finally, dirt deposited on the hot exhaust pipe can lead to uncontrolled spontaneous combustion of these deposits DE 1 027 084 is a jacketed exhaust pipe known. During driving, the speed increases depending on the exhaust pipe Passed fresh air between the exhaust pipe and the jacket by convection from the exhaust pipe heat emitted and leads them to the outside. Furthermore, the show DE 102 06 066 A1 and the DE 22 40 681 A1 such arrangements.

Eine derartige Anordnung, die als passives Kühlsystem bezeichnet werden kann, kann insbesondere für in der Regel langsam fahrende oder im Stationärbetrieb bei Leistungsabgabe über die Zapfwelle (PTO) arbeitende landwirtschaftliche Maschinen, wie beispielsweise Traktoren, ungünstig sein, da mangels Fahrtwind eine ausreichende Kühlluftzufuhr nicht gegeben ist. Hiervon ausgehend besteht die Aufgabe der vorliegenden Erfindung darin, ein von der Fahrgeschwindigkeit weitgehend unabhängiges Kühlsystem für ein Abgassystem bereitzustellen.Such an arrangement, which can be referred to as a passive cooling system, can be unfavorable especially for normally slow-moving or stationary operation at power output via PTO (PTO) agricultural machinery, such as tractors, as lack of wind sufficient cooling air supply is not given is. On this basis, the object of the present invention is to provide a largely independent of the driving speed cooling system for an exhaust system.

Die Aufgabe wird gelöst durch ein Kühlsystem zur aktiven Kühlung eines Abgassystems, umfassend einen Rußpartikelfilter, ein Abgasrohr zur Ableitung eines Abgasstroms einer Verbrennungskraftmaschine und ein Luftführungselement, das gegenüber dem Abgasrohr unter Bildung eines Luftführungskanals angeordnet ist, um durch Zuführen eines Luftstroms in den Luftführungskanal das Abgasrohr zu kühlen, wobei Gebläsemittel vorgesehen sind, die das Zuführen des Luftstroms in den Luftführungskanal bewirken und das Abgasrohr zur Kühlung des Abgasstroms stromabwärts des Rußpartikelfilters eine erste Venturidüsen-Anordnung aufweist.The object is achieved by a cooling system for active cooling of an exhaust system, comprising a soot particle filter, an exhaust pipe for discharging an exhaust gas stream of an internal combustion engine and an air guide element, which is arranged opposite the exhaust pipe to form an air duct, by supplying an air flow into the air duct the exhaust pipe cooling, wherein blowing means are provided which cause the supply of the air flow into the air duct and the exhaust pipe for cooling the exhaust gas stream downstream of the particulate filter has a first Venturi nozzle arrangement.

Durch diese Anordnung wird in vorteilhafterweise sichergestellt, dass die Kühlleistung der aktiven Kühlung des Abgasrohrs zumindest weitestgehend von einer Fahrgeschwindigkeit unabhängig ist und lediglich von der Kühlleistung der Gebläsemittel abhängig ist. Hierdurch ist auch bei Feldarbeiten unter Last mit einer landwirtschaftlichen Maschine mit typischen Geschwindigkeiten von unter 10km/h oder im Stationärbetrieb bei Leistungsabgabe über die Zapfwelle eine aktive Kühlung über einen Luftstrom, der mittels der Gebläsemittel in den Luftführungskanal eingeleitet wird, gewährleistet.By this arrangement is advantageously ensured that the cooling capacity of the active cooling of the exhaust pipe is at least largely independent of a driving speed and only depends on the cooling capacity of the fan means. As a result, even with field work under load with an agricultural machine with typical speeds of less than 10km / h or in stationary mode with power output via the PTO active cooling via an air flow, which is introduced by the fan means in the air duct, guaranteed.

Bevorzugt verdichten die Gebläsemittel den Luftstrom auf ein gegenüber einem Umgebungsdruck erhöhtes Druckniveau. Hierdurch wird in vorteilhafterweise auch bei niedrigen Fahrgeschwindigkeiten gewährleistet, dass ein Druckgefälle genutzt werden kann, um den Luftstrom in den Luftführungskanal einzuleiten. Hierbei ist unter Umgebungsdruck der jeweils herrschende atmosphärische Luftdruck zu verstehen.The fan means preferably compress the air flow to a pressure level which is higher than an ambient pressure. This ensures advantageously even at low speeds that a pressure gradient can be used to initiate the air flow in the air duct. Here, ambient pressure is the prevailing atmospheric air pressure.

In bevorzugter Ausgestaltung führen die Gebläsemittel einen Kühlabluftstrom der Verbrennungskraftmaschine als Luftstrom dem Luftführungskanal zu. Von Vorteil ist, dass der in den Luftführungskanal eintretende Luftstrom bereits gefiltert ist, da dieser als Kühlabluftstrom der Verbrennungskraftmaschine bereits durch ein entsprechendes Filtersystem eines Kühlsystems der Verbrennungskraftmaschine geleitet wurde.In a preferred embodiment, the blower means lead a cooling exhaust air flow of the internal combustion engine as air flow to the air duct. It is advantageous that the air flow entering the air duct is already filtered, since it has already been passed as a cooling exhaust air stream of the internal combustion engine through a corresponding filter system of a cooling system of the internal combustion engine.

In weiterhin bevorzugter Ausgestaltung weist das Luftführungselement eine Lufteintrittsöffnung zu dem Luftführungskanal auf, wobei der Luftführungskanal über die Lufteintrittsöffnung mit einem Motorraum der Verbrennungskraftmaschine zum Zuführen des Kühlabluftstroms verbunden ist. Durch den Motorraum wird gewährleistet, dass sich ein erhöhtes Druckniveau einstellen kann, welches dann den Kühlabluftstrom durch die Lufteintrittsöffnung in den Luftführungskanal übertreten lässt. Bei dem Motorraum handelt es sich um eine Einhausung der Verbrennungskraftmaschine, wobei die Einhausung aus einer Motorhaube und einem oder mehreren Verkleidungsteilen bestehen kann, wozu auch die Spritzwand einer Fahrerkabine zählen kann. Der Motorraum ist bis auf eine Luftzuführöffnung zu dem Lüfteraggregat und eine mit der Lufteintrittsöffnung des Luftführungskanals korrespondierende Luftaustrittsöffnung weitestgehend luftdicht gekapselt.In a further preferred embodiment, the air guide element has an air inlet opening to the air duct, wherein the air duct is connected via the air inlet opening with an engine compartment of the internal combustion engine for supplying the cooling exhaust air flow. Through the engine compartment ensures that an increased pressure level can be set, which then can pass the cooling exhaust air flow through the air inlet opening in the air duct. In the engine compartment is an enclosure of the internal combustion engine, wherein the enclosure may consist of a hood and one or more trim parts, including the splashboard of a cab can count. The engine compartment is encapsulated as far as possible air-tight except for an air supply opening to the fan unit and with the air inlet opening of the air duct corresponding air outlet opening.

Bevorzugt umfassen die Gebläsemittel ein Lüfteraggregat eines Kühlkreislaufs Verbrennungskraftmaschine. Da ein Kühlkreislauf einer Verbrennungskraftmaschine regelmäßig einen Lüfteraggregat aufweist, kann in vorteilhafterweise durch bereits vorhandene Mittel, nämlich das Lüfteraggregat in Form eines mechanisch oder elektrisch angetriebenen Kühlventilators, das erhöhte Druckniveau beziehungsweise das Druckgefälle in Richtung des Abgassystems erzeugt werden.The fan means preferably comprise a fan unit of a refrigeration cycle internal combustion engine. Since a cooling circuit of an internal combustion engine regularly has a fan unit, can advantageously by existing means, namely the fan unit in the form of a mechanically or electrically driven Cooling fan, the increased pressure level or the pressure gradient are generated in the direction of the exhaust system.

In weiterhin bevorzugter Ausgestaltung weist das Luftführungselement zumindest zwei Austrittsöffnungen für den Luftführungskanal auf, wobei die erste Austrittsöffnung im Bereich einer Mündungsöffnung des Abgasrohrs angeordnet ist und die zweite Austrittsöffnung stromaufwärts zu der Mündungsöffnung angeordnet ist. Durch die zweite Austrittsöffnung wird in vorteilhafterweise ein zu hoher Gegendruck in dem Luftführungskanal vermieden.In a further preferred embodiment, the air guide element has at least two outlet openings for the air duct, wherein the first outlet opening is arranged in the region of a mouth opening of the exhaust pipe and the second outlet opening is arranged upstream of the mouth opening. Due to the second outlet opening, an excessively high back pressure in the air duct is advantageously avoided.

Bevorzugt weist das Abgasrohr eine erste Venturidüsen-Anordnung zur Ansaugung von Luft, die das Abgasrohr umgibt, auf, wobei das Luftführungselement stromabwärts der ersten Venturidüsen-Anordnung einen Ringspalt ausbildet. Hierdurch wird in vorteilhafterweise sichergestellt, dass über die Venturi-Düse im Abgasrohr Kühlluft dem Abgas zugeführt wird, wodurch die hohen Abgastemperaturen während einer Regeneration des DPF gesenkt werden, um der Entstehung unerwünschter Stickoxide im Abgasrohr infolge der hohen Temperaturen entgegenzuwirken.Preferably, the exhaust pipe has a first Venturi nozzle arrangement for the intake of air, which surrounds the exhaust pipe, wherein the air guide element forms an annular gap downstream of the first Venturi nozzle arrangement. As a result, it is advantageously ensured that cooling air is supplied to the exhaust gas via the Venturi nozzle in the exhaust pipe, whereby the high exhaust gas temperatures during regeneration of the DPF are reduced in order to counteract the formation of undesired nitrogen oxides in the exhaust pipe due to the high temperatures.

Bevorzugt ist der Ringspalt zwischen zwei Austrittsöffnungen des Luft führungselements angeordnet. Hierdurch wird gewährleistet, dass über die zweite Austrittsöffnung ein eventuell bestehender Überdruck zu einem gewissen Teil abgebaut wird, so dass über den Ringspalt keine Kühlluft abgeblasen wird, sondern über den Kamineffekt, welcher sich stromabwärts des Ringspalts einstellt, weitere Kühlluft von Außen angesaugt wird.Preferably, the annular gap between two outlet openings of the air guide elements is arranged. This ensures that over the second outlet opening any existing overpressure is reduced to a certain extent, so that no cooling air is blown off via the annular gap, but via the chimney effect, which adjusts downstream of the annular gap, further cooling air is sucked from the outside.

Bevorzugt ist der Ringspalt als eine zweite Venturidüsen-Anordnung ausgebildet, zur Ansaugung von Umgebungsluft in den Luftführungskanal. Hierbei kann die zweite Venturidüsen-Anordnung in Kombination mit dem Kamineffekt, der sich stromabwärts in dem Abgasrohr einstellt, dazu genutzt werden, Umgebungsluft zur Unterstützung der Kühlung einzusaugen.Preferably, the annular gap is formed as a second Venturi nozzle arrangement for the intake of ambient air into the air duct. Here, the second Venturi nozzle arrangement in combination with the chimney effect, which adjusts downstream in the exhaust pipe, can be used to suck in ambient air to support the cooling.

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird anhand der Figuren nachfolgend beschrieben. Hierin zeigen

  • Figur 1 eine perspektivische Gesamtansicht eines erfindungsgemäßen Kühlsystems zur aktiven Kühlung eines Abgassystems und
  • Figur 2 einen Querschnitt durch ein erfindungsgemäßes Kühlsystem zur aktiven Kühlung eines Abgassystems.
A preferred embodiment of the invention will be described below with reference to the figures. Show here
  • FIG. 1 an overall perspective view of a cooling system according to the invention for the active cooling of an exhaust system and
  • FIG. 2 a cross section through a cooling system according to the invention for the active cooling of an exhaust system.

Die Figur 1 zeigt ausschnittsweise ein landwirtschaftliches Nutzfahrzeug 48 in Form eines Traktors mit einer Kabine 50, einem Rahmen 52 und einer nur angedeuteten Verbrennungskraftmaschine 16 mit einem Abgassystem 12 zur Ableitung eines Abgasstroms 22. Die Verbrennungskraftmaschine 16 ist in herkömmlicher Weise innerhalb eines Motorraums 34 angeordnet. Das Abgassystem 16 umfasst einen in seiner Position nur angedeuteten Rußpartikelfilter 52, ein Abgasrohr 14 und ein Luftführungselement 18, welches das Abgasrohr 14 unter Bildung eines Luftführungskanals 20 umschließt. Das Abgassystem 12 kann weitere, nicht dargestellte Komponenten wie beispielsweise einen oder mehrere Katalysator umfassen.The FIG. 1 1 shows a detail of an agricultural utility vehicle 48 in the form of a tractor with a cab 50, a frame 52 and an only indicated internal combustion engine 16 with an exhaust system 12 for discharging an exhaust gas stream 22. The internal combustion engine 16 is arranged within an engine compartment 34 in a conventional manner. The exhaust system 16 comprises a soot particle filter 52, which is only indicated in its position, an exhaust pipe 14 and an air guide element 18 which encloses the exhaust pipe 14 to form an air duct 20. The exhaust system 12 may include other components, not shown, such as one or more catalytic converters.

Die Verbrennungskraftmaschine 16 verfügt in herkömmlicher Weise über einen ebenfalls nur angedeuteten Flüssigkeitskühlkreislauf 30 mit einem Hochtemperaturwärmetauscher, der mittels eines Lüfteraggregats 28 mit Kühlluft beaufschlagt wird, die über einen Kühlergrill und nachgeordnete Filtereinschübe aus der Umgebung angesaugt wird. Durch die Filtereinschübe ist die in den Motorraum 34 geleitete Kühlluft weitgehend von Verunreinigungen befreit. Die durch das Lüfteraggregat 28 hervorgerufene Verdichtung der Kühlluft führt zu einem gegenüber dem atmosphärischen Umgebungsdruck erhöhten Druckniveau der Kühlluft im Motorraum 34. Die durch den Hochtemperaturwärmetauscher und den Motorraum 34 geleitete Kühlluft wird als Kühlabluftstrom 26 zur aktiven Kühlung des Abgassystems 12 in den Luftführungskanal 20, der durch das als Ummantelung gegenüber dem Abgasrohr 14 angeordnete Luftführungselement 18 gebildet wird, eingeleitet.The internal combustion engine 16 has in a conventional manner via a likewise only indicated liquid cooling circuit 30 with a high-temperature heat exchanger, which is acted upon by means of a fan unit 28 with cooling air, which is sucked in via a grille and downstream filter trays from the environment. By the filter trays the guided into the engine compartment 34 cooling air is largely freed of impurities. The caused by the fan assembly 28 compression of the cooling air leads to a relative to the atmospheric pressure increased pressure level of the cooling air in the engine compartment 34. The guided through the high-temperature heat exchanger and the engine compartment 34 cooling air is as Kühlabluftstrom 26 for active cooling of the exhaust system 12 in the air duct 20, the by the formed as a jacket relative to the exhaust pipe 14 arranged air guide element 18 is initiated.

Zur Kühlung des Abgasstroms 22 stromabwärts des Rußpartikelfilters 52 weist das Abgasrohr 14 eine erste Venturidüsen-Anordnung 42 auf, wie dies in Figur 2 zu erkennen ist. Die erste Venturidüsen-Anordnung 42 wird gebildet, indem das Abgasrohr 14 zweiteilig gestaltet ist und das stromaufwärts angeordnete Abgasrohrelement 54 einen Mündungsbereich 56 ausbildet, der sich düsenförmige in das offene Ende 58 des stromabwärts angeordnete Abgasrohrelement 60 des Abgasrohrs 14 erstreckt. Die Venturidüsen-Anordnung 42 weist im Wesentlichen einen kreisförmigen Querschnitt auf. Durch das Venturiprinzip wird ein Unterdruck erzeugt, durch den Luft aus dem Luftführungskanal 20 in das Abgasrohr 14 gesaugt wird, um den Abgasstrom 22 zu kühlen.For cooling the exhaust gas flow 22 downstream of the soot particle filter 52, the exhaust gas pipe 14 has a first Venturi nozzle arrangement 42, as shown in FIG FIG. 2 can be seen. The first venturi nozzle assembly 42 is formed by making the exhaust pipe 14 in two parts and the upstream exhaust pipe member 54 forms an orifice portion 56 which extends nozzle-shaped into the open end 58 of the downstream exhaust pipe member 60 of the exhaust pipe 14. The Venturi nozzle arrangement 42 essentially has a circular cross section. By the Venturi principle, a negative pressure is generated, is sucked through the air from the air duct 20 into the exhaust pipe 14 in order to cool the exhaust gas stream 22.

Das Luftführungselement 18 ist bei dem dargestellten Ausführungsbeispiel vierteilig gestaltet, bestehend aus einer motorseitigen Schutzabdeckung 62, einer zwei Abdeckschalen 64, 64' umfassende horizontalen Schutzabdeckung 66 und einer vertikalen Schutzabdeckung 68. Die Anzahl der Teile, aus denen das Luftführungselement gebildet wird, kann bei anderen erfindungsgemäßen Ausführungsformen variieren.The air guide element 18 is designed in four parts in the illustrated embodiment, consisting of a motor-side protective cover 62, a two covers 64, 64 'comprehensive horizontal protective cover 66 and a vertical protective cover 68. The number of parts from which the air guide element is formed, in others Embodiments of the invention vary.

Das Luftführungselement 18 umschließt das Abgasrohr 14 und bildet somit mit dem Abgasrohr 14 einen Luftführungskanal 20. Der Luftführungskanal 20 ist über eine Lufteintrittsöffnung 32 mit dem Motorraum 34 verbunden. Die Lufteintrittsöffnung 32 wird gebildet, indem zwischen dem Abgasrohr 14 und der seitlichen Motorabdeckung 70 ein Luftspalt 72 ausgebildet ist, welcher gegenüber der Umgebung mit der vertikalen Schutzabdeckung 66, die halbschalenförmig ausgebildet ist, abgedeckt ist. Die zwei Abdeckschalen 64, 64' der horizontalen Schutzabdeckung 66 bilden im zusammengesetzten Zustand die zweite Austrittsöffnung 38 aus, die nach unten zum Boden gerichtet ist und auf dem stromabwärtigen Ende der Schutzabdeckung 66 angeordnet ist. Dadurch, dass die zweite Austrittsöffnung 38 nach unten gerichtet ist, wird sowohl der Schall als auch den warmen Kühlabluftstrom nach unten in Richtung Boden abgeführt.The air guide element 18 surrounds the exhaust pipe 14 and thus forms with the exhaust pipe 14 an air duct 20. The air duct 20 is connected via an air inlet opening 32 to the engine compartment 34. The air inlet opening 32 is formed by an air gap 72 is formed between the exhaust pipe 14 and the side engine cover 70, which is covered with respect to the environment with the vertical protective cover 66 which is formed in a half-shell-shaped. The two cover shells 64, 64 'of the horizontal protective cover 66 form in the assembled state the second outlet opening 38, which is directed down to the ground and is arranged on the downstream end of the protective cover 66. Characterized in that the second outlet opening 38 is directed downwards, both the sound and the warm Kühlabuftstrom is discharged downward towards the ground.

Der Übergangsbereich von der horizontalen Schutzabdeckung 66 zu der vertikalen Schutzabdeckung 68 bildet einen Ringspalt 44 aus. Bei dem vorliegenden Ausführungsbeispiel ist der Ringspalt 44 als eine zweite Venturidüsen-Anordnung 46 ausgeführt. Hierbei weist die horizontale Schutzabdeckung 66 einen sich stromabwärts verjüngenden Mündungsbereich 74 auf, der düsenförmig in das offene Ende 76 der vertikalen Schutzabdeckung 68 hineinragt. Hierdurch wird zwischen dem Mündungsbereich 74 und dem offenen Ende 76 ein Ansaugbereich gebildet, in welchem nach dem Venturi-Prinzip bei Hindurchtreten eines Kühlabluftstroms durch den Luftführungskanal 20 ein Unterdruck gegenüber der Umgebung erzeugt wird, so dass Umgebungsluft in den Luftführungskanal 20 angesaugt wird. Über die Austrittsöffnung 36 im Bereich der Mündungsöffnung 40 des Abgasrohrs14 tritt der Kühlabluftstrom in die Umgebung.The transition region from the horizontal protective cover 66 to the vertical protective cover 68 forms an annular gap 44. In the present embodiment, the annular gap 44 is configured as a second venturi arrangement 46. Here, the horizontal protective cover 66 has a downstream tapered mouth portion 74 which projects nozzle-shaped into the open end 76 of the vertical protective cover 68. As a result, a suction region is formed between the mouth region 74 and the open end 76, in which a negative pressure relative to the environment is generated according to the venturi principle when a cooling exhaust air stream passes through the air duct 20, so that ambient air is drawn into the air duct 20. Via the outlet opening 36 in the region of the mouth opening 40 of the exhaust pipe 14, the cooling exhaust air stream enters the environment.

Weiterhin kann im Bereich des Ringspalts 44 beziehungsweise in dem Ansaugbereich der zweiten Venturidüsen-Anordnung 46 ein nicht näher dargestelltes Filterelement, beispielsweise in Form eines Lochgitters, vorgesehen sein, um vor allem gröbere Verunreinigungen zurückzuhalten und ein Zusetzen des Luftführungskanals 20 zu verhindern.Furthermore, in the region of the annular gap 44 or in the intake region of the second Venturidüsen arrangement 46, a filter element not shown in detail, for example in the form of a perforated grid, be provided to retain mainly coarser impurities and prevent clogging of the air duct 20.

Somit dient das Luftführungselement 18 sowohl als Berührungsschutz für ein heißes Abgasrohr 14, in dem es dieses vollständig ummantelt, als auch der Bildung eines Luftführungskanals 20 um das Abgasrohr 14, über den ein aktiv eingeleiteter Luftstrom eine Kühlung gewährleistet.Thus, the air guide element 18 serves both as protection against contact for a hot exhaust pipe 14, in which it completely encases this, as well as the formation of an air duct 20 around the exhaust pipe 14, through which an actively introduced air flow ensures cooling.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Kühlsystemcooling system
1212
Abgassystemexhaust system
1414
Abgasrohrexhaust pipe
1616
VerbrennungskraftmaschineInternal combustion engine
1818
LuftführungselementAir conduit
2020
LuftführungskanalAir duct
2222
Abgasstromexhaust gas flow
2424
Luftstromairflow
2626
KühlabluftstromCooling the exhaust air flow
2828
Lüfteraggregatfan unit
3030
KühlkreislaufCooling circuit
3232
LufteintrittsöffnungAir inlet opening
3434
Motorraumengine compartment
3636
Austrittsöffnungoutlet opening
3838
Austrittsöffnungoutlet opening
4040
Mündungsöffnungmouth
4242
erste Venturidüsen-Anordnungfirst venturi nozzle arrangement
4444
Ringspaltannular gap
4646
zweite Venturidüsen-Anordnungsecond venturi nozzle arrangement
4848
landwirtschaftliches Nutzfahrzeugagricultural utility vehicle
5050
Kabinecabin
5252
RußpartikelfilterRußpartikelfilter
5454
AbgasrohrelementExhaust pipe element
5656
Mündungsbereichmouth area
5858
offene Endeopen end
6060
AbgasrohrelementExhaust pipe element
6262
Schutzabdeckungprotective cover
64, 64'64, 64 '
Abdeckschalecover shell
6666
Schutzabdeckungprotective cover
6868
Schutzabdeckungprotective cover
7070
Motorabdeckungengine cover
7272
Luftspaltair gap
7474
Mündungsbereichmouth area
7676
offene Endeopen end

Claims (9)

  1. Cooling system (10) for the active cooling of an exhaust system (12), comprising
    a soot particle filter (52), an exhaust pipe (14) for the discharge of an exhaust-gas flow (22) of an internal combustion engine (16), and
    an air-guiding element (18) which is arranged relative to the exhaust pipe (14) such that an air-guiding duct (20) is formed for the purposes of cooling the exhaust pipe (14) through the supply of an air flow (24) into the air-guiding duct (20), wherein blower means (28) are provided which effect the supply of the air flow (24) into the air-guiding duct (20),
    characterized in that the exhaust pipe (14) has a first Venturi nozzle arrangement (42) for cooling the exhaust-gas flow (22) downstream of the soot particle filter (52).
  2. Cooling system according to Claim 1,
    characterized
    in that the blower means (28) compress the air flow (24) to an elevated pressure level in relation to ambient pressure.
  3. Cooling system according to Claim 1 or 2,
    characterized
    in that the blower means supply a waste cooling air flow (26) of the internal combustion engine (16) as an air flow (24) to the air-guiding duct (20).
  4. Cooling system according to Claim 3,
    characterized
    in that the air-guiding element (18) has an air inlet opening (32) to the air-guiding duct (20), wherein the air-guiding duct (20) is connected by way of the air inlet opening (32) to an engine compartment (34) of the internal combustion engine (16) for the supply of the waste cooling air flow (26).
  5. Cooling system according to one of Claims 1 to 4,
    characterized
    in that the blower means (28) comprise a fan assembly of a cooling circuit (30) of the internal combustion engine (16).
  6. Cooling system according to one of Claims 1 to 5,

    characterized
    in that the air-guiding element (18) has at least two outlet openings (36, 38) for the air-guiding duct (20), wherein one of the outlet openings (36, 38) is arranged upstream of a mouth region (56) of the exhaust pipe (14).
  7. Cooling system according to one of Claims 1 to 6,

    characterized
    in that the exhaust pipe (14) has the first Venturi nozzle arrangement (42) for drawing in air, which Venturi nozzle arrangement surrounds the exhaust pipe (14), wherein the air-guiding element (18), downstream of the first Venturi nozzle arrangement (42), forms a ring-shaped gap (44).
  8. Cooling system according to Claim 1 to 7,
    characterized
    in that a ring-shaped gap (44) is arranged between two outlet openings (36, 38) of the air-guiding element (18).
  9. Cooling system according to Claim 8,
    characterized
    in that the ring-shaped gap is in the form of a second Venturi nozzle arrangement (46) for drawing ambient air into the air-guiding duct (20).
EP12797834.4A 2011-12-02 2012-11-28 Cooling system for actively cooling an exhaust gas system Active EP2785993B1 (en)

Applications Claiming Priority (2)

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DE102011087675A DE102011087675A1 (en) 2011-12-02 2011-12-02 Cooling system for active cooling of an exhaust system
PCT/EP2012/073824 WO2013079523A1 (en) 2011-12-02 2012-11-28 Cooling system for actively cooling an exhaust gas system

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EP2785993A1 EP2785993A1 (en) 2014-10-08
EP2785993B1 true EP2785993B1 (en) 2016-07-06

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EP (1) EP2785993B1 (en)
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Publication number Priority date Publication date Assignee Title
JP1551299S (en) * 2015-07-27 2016-06-13
US10704438B2 (en) * 2015-11-17 2020-07-07 Carrier Corporation Temperature control of exhaust gas of a transportation refrigeration unit
JP7189058B2 (en) * 2019-03-26 2022-12-13 三菱マヒンドラ農機株式会社 Work vehicle exhaust gas emission structure
US11725667B2 (en) 2019-12-30 2023-08-15 Cnh Industrial America Llc Air source system of an agricultural system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE841830C (en) * 1941-10-30 1952-06-19 Maybach Motorenbau G M B H Cooling of encapsulated internal combustion engines in rail cars
DE1027084B (en) 1953-04-21 1958-03-27 Daimler Benz Ag Exhaust system
DE1099799B (en) * 1959-04-14 1961-02-16 Daimler Benz Ag Exhaust pipe for motor vehicles
GB1361910A (en) * 1971-08-19 1974-07-30 Ford Motor Co Internal combustion engine having a catalytic converter for ex haust gases
US3820327A (en) * 1972-05-10 1974-06-28 Peugeot & Renault Temperature regulator for a catalytic reactor
DE2731205C3 (en) * 1977-07-11 1983-02-17 Pusch, Günter, Dr.-Ing., 6903 Neckargemünd Process and device for the protection (IR camouflage) of the outlet points of hot gases, such as exhaust pipes of internal combustion engines
AT4964U1 (en) * 2001-02-15 2002-01-25 Avl List Gmbh INTERNAL COMBUSTION ENGINE WITH AN EXHAUST SYSTEM
US6832872B2 (en) * 2002-11-13 2004-12-21 Blaw-Knox Construction Equipment Corporation Gas discharge device for a construction vehicle
US20070193251A1 (en) * 2006-02-17 2007-08-23 Eldridge Engineering Group (Div) - L. C. Eldridge Sales Co. Inc. Eldridge ENJET - Engine Exhaust Jet Nozzle - An Exhaust Gas Dispersal and Dilution Method and Apparatus for Internal Combustion Engines
KR101026190B1 (en) * 2009-01-23 2011-03-31 볼보 컨스트럭션 이큅먼트 에이비 Aparatus for decreasing exhausted overheating gas temperature of engine room
DE102009045742A1 (en) * 2009-10-15 2011-04-21 Deere & Company, Moline Device for cooling an exhaust gas flow emerging from a soot particle filter
DE102009046253A1 (en) * 2009-10-30 2011-05-05 Deere & Company, Moline Device for cooling an exhaust gas flow

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EP2785993A1 (en) 2014-10-08
WO2013079523A1 (en) 2013-06-06

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