EP2785993A1 - Système de refroidissement actif d'un système d'échappement - Google Patents

Système de refroidissement actif d'un système d'échappement

Info

Publication number
EP2785993A1
EP2785993A1 EP12797834.4A EP12797834A EP2785993A1 EP 2785993 A1 EP2785993 A1 EP 2785993A1 EP 12797834 A EP12797834 A EP 12797834A EP 2785993 A1 EP2785993 A1 EP 2785993A1
Authority
EP
European Patent Office
Prior art keywords
air
cooling
exhaust pipe
cooling system
exhaust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12797834.4A
Other languages
German (de)
English (en)
Other versions
EP2785993B1 (fr
Inventor
Bernd Helferich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Publication of EP2785993A1 publication Critical patent/EP2785993A1/fr
Application granted granted Critical
Publication of EP2785993B1 publication Critical patent/EP2785993B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features 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 exhaust 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

  • Cooling system for the active cooling of an exhaust gas system
  • the invention relates to a cooling system for actively cooling 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 states, 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.
  • 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.
  • deposited on the hot exhaust pipe dirt can lead to uncontrolled spontaneous combustion of these deposits.
  • a jacketed exhaust pipe is known. During driving, fresh air bypassing the exhaust pipe, depending on the speed, absorbs heat emitted by the exhaust pipe between the exhaust pipe and the jacket by convection and leads it to the outside.
  • 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.
  • PTO PTO
  • 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 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, wherein blower means are provided which cause the supply of air flow into the air duct.
  • 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.
  • 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
  • Housing may consist of a hood and one or more trim parts, including the dashboard of a driver's 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, the first outlet opening being arranged in the region of an outlet opening of the exhaust pipe and the second outlet opening being arranged upstream of the outlet opening. Due to the second outlet opening, an excessively high back pressure in the air duct is advantageously avoided.
  • the exhaust pipe has a 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 Venturi nozzle arrangement.
  • the exhaust pipe has a 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 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 designed as Venturi nozzle arrangement for the intake of ambient air into the air duct.
  • the 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.
  • Figure 1 is an overall perspective view of a cooling system according to the invention for the active cooling of an exhaust system
  • FIG. 2 shows a cross section through an inventive cooling system for the active cooling of an exhaust system.
  • FIG. 1 shows a detail of an agricultural utility vehicle 48 in the form of a tractor with a cabin 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 in a conventional manner within an engine compartment 34.
  • 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 venturi nozzle arrangement 42, as can be seen in FIG.
  • the venturi assembly 42 is formed by forming 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.
  • 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 designed as a venturi nozzle 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 gas pipe 14, the cooling exhaust air stream enters the environment.
  • a filter element not shown in more detail for example in the form of a perforated grid, can be provided in order to retain primarily coarser impurities and to prevent clogging of the air conduction channel 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.

Landscapes

  • 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)

Abstract

L'invention concerne un système (10) de refroidissement actif d'un système d'échappement (12), comprenant un tuyau d'échappement (14) servant à évacuer un flux de gaz d'échappement (22) d'une machine à combustion interne (16) et un élément guide d'air (18) disposé en face du tuyau d'échappement (14) de manière à former un conduit de guidage de l'air (20) afin de refroidir le tuyau d'échappement (14) en introduisant un flux d'air (24) dans le conduit de guidage (20).
EP12797834.4A 2011-12-02 2012-11-28 Système de refroidissement actif d'un système d'échappement Active EP2785993B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011087675A DE102011087675A1 (de) 2011-12-02 2011-12-02 Kühlsystem zur aktiven Kühlung eines Abgassystems
PCT/EP2012/073824 WO2013079523A1 (fr) 2011-12-02 2012-11-28 Système de refroidissement actif d'un système d'échappement

Publications (2)

Publication Number Publication Date
EP2785993A1 true EP2785993A1 (fr) 2014-10-08
EP2785993B1 EP2785993B1 (fr) 2016-07-06

Family

ID=47297206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12797834.4A Active EP2785993B1 (fr) 2011-12-02 2012-11-28 Système de refroidissement actif d'un système d'échappement

Country Status (4)

Country Link
US (1) US20150128578A1 (fr)
EP (1) EP2785993B1 (fr)
DE (1) DE102011087675A1 (fr)
WO (1) WO2013079523A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP1551299S (fr) * 2015-07-27 2016-06-13
WO2017087144A1 (fr) * 2015-11-17 2017-05-26 Carrier Corporation Régulation de température de gaz d'échappement d'une unité frigorifique de transport
JP7189058B2 (ja) * 2019-03-26 2022-12-13 三菱マヒンドラ農機株式会社 作業車両の排気ガス排出構造
US11725667B2 (en) 2019-12-30 2023-08-15 Cnh Industrial America Llc Air source system of an agricultural system
US12320416B2 (en) * 2021-05-07 2025-06-03 Kawasaki Motors, Ltd. Utility vehicle

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DE1027084B (de) 1953-04-21 1958-03-27 Daimler Benz Ag Auspuffanlage
DE1099799B (de) * 1959-04-14 1961-02-16 Daimler Benz Ag Auspuffleitung fuer Kraftwagen
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 (de) * 1977-07-11 1983-02-17 Pusch, Günter, Dr.-Ing., 6903 Neckargemünd Verfahren und Vorrichtung zum Schutz (IR-Tarnung) der Austrittsstellen heißer Gase, wie z.B. Auspuffstutzen von Brennkraftmaschinen
AT4964U1 (de) * 2001-02-15 2002-01-25 Avl List Gmbh Brennkraftmaschine mit einem abgassystem
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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 (ko) * 2009-01-23 2011-03-31 볼보 컨스트럭션 이큅먼트 에이비 엔진룸의 과열가스 온도 저감장치
DE102009045742A1 (de) * 2009-10-15 2011-04-21 Deere & Company, Moline Vorrichtung zur Kühlung eines aus einem Rußpartikelfilter austretenden Abgasstroms
DE102009046253A1 (de) * 2009-10-30 2011-05-05 Deere & Company, Moline Vorrichtung zur Kühlung eines Abgasstroms

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Also Published As

Publication number Publication date
DE102011087675A1 (de) 2013-06-06
EP2785993B1 (fr) 2016-07-06
WO2013079523A1 (fr) 2013-06-06
US20150128578A1 (en) 2015-05-14

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