EP2785993B1 - Cooling system for actively cooling an exhaust gas system - Google Patents
Cooling system for actively cooling an exhaust gas system Download PDFInfo
- 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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- 238000001816 cooling Methods 0.000 title claims description 59
- 239000003570 air Substances 0.000 claims description 88
- 238000002485 combustion reaction Methods 0.000 claims description 22
- 239000004071 soot Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000012080 ambient air Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims 2
- 230000001681 protective effect Effects 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 238000007599 discharging Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
-
- 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
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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
-
- 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
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
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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.
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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
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
Zur Kühlung des Abgasstroms 22 stromabwärts des Rußpartikelfilters 52 weist das Abgasrohr 14 eine erste Venturidüsen-Anordnung 42 auf, wie dies in
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
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
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
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
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
- 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)
- 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). - 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. - 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). - 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). - 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). - 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). - 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). - 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). - 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).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2785993A1 EP2785993A1 (en) | 2014-10-08 |
EP2785993B1 true EP2785993B1 (en) | 2016-07-06 |
Family
ID=47297206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12797834.4A Active EP2785993B1 (en) | 2011-12-02 | 2012-11-28 | Cooling system for actively cooling an exhaust gas system |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150128578A1 (en) |
EP (1) | EP2785993B1 (en) |
DE (1) | DE102011087675A1 (en) |
WO (1) | WO2013079523A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP1551299S (en) * | 2015-07-27 | 2016-06-13 | ||
WO2017087144A1 (en) * | 2015-11-17 | 2017-05-26 | 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 |
Family Cites Families (12)
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 |
-
2011
- 2011-12-02 DE DE102011087675A patent/DE102011087675A1/en not_active Withdrawn
-
2012
- 2012-11-28 US US14/359,350 patent/US20150128578A1/en not_active Abandoned
- 2012-11-28 WO PCT/EP2012/073824 patent/WO2013079523A1/en active Application Filing
- 2012-11-28 EP EP12797834.4A patent/EP2785993B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2013079523A1 (en) | 2013-06-06 |
US20150128578A1 (en) | 2015-05-14 |
EP2785993A1 (en) | 2014-10-08 |
DE102011087675A1 (en) | 2013-06-06 |
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