EP2853709A1 - Stufenweise zusammenführende Abdeckung einer Nachbehandlungsvorrichtung - Google Patents

Stufenweise zusammenführende Abdeckung einer Nachbehandlungsvorrichtung Download PDF

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Publication number
EP2853709A1
EP2853709A1 EP14181137.2A EP14181137A EP2853709A1 EP 2853709 A1 EP2853709 A1 EP 2853709A1 EP 14181137 A EP14181137 A EP 14181137A EP 2853709 A1 EP2853709 A1 EP 2853709A1
Authority
EP
European Patent Office
Prior art keywords
aftertreatment device
shroud
sidewall
stepped conduit
conduit
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.)
Withdrawn
Application number
EP14181137.2A
Other languages
English (en)
French (fr)
Inventor
Nithin Choudary
Mark L Mattson
Xijun Wang
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 EP2853709A1 publication Critical patent/EP2853709A1/de
Withdrawn legal-status Critical Current

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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
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • 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

Definitions

  • This invention relates to internal combustion engines. More particularly, it relates to aftertreatment devices for internal combustion engines. Even more particularly, it relates to shrouds for aftertreatment devices.
  • Aftertreatment devices that process the exhaust gases to remove impurities. These aftertreatment devices operate at elevated temperatures and in dirty surroundings. They must be kept clean in order not to accumulate combustible matter that can catch fire and damage the aftertreatment device. For this reason, aftertreatment devices may be enclosed in insulated chambers, or provided with a supply of air that flows across their surface in order to keep combustible material from being deposited on the surface.
  • an aftertreatment device was provided with a shroud that defined an elongate plenum extending along the length of the aftertreatment device. Below this plenum a wall with several apertures was provided. Air entering the plenum could freely travel the length of the plenum, and its force, direction, and intensity was controlled by the location of the apertures formed in the wall.
  • a shroud for an aftertreatment device for treating exhaust gas from an internal combustion engine comprising: a stepped conduit configured to be disposed over an upper surface of the aftertreatment device and extending over substantially an entire length of the aftertreatment device, wherein the stepped conduit is configured to channel a flow of cleaning air longitudinally along an outer and upper surface of the aftertreatment device, wherein an inner surface of the stepped conduit defines at least a first downwardly extending step and a second downwardly extending step that are spaced apart along a length of the aftertreatment device, to direct at least a portion of the flow of cleaning air downward.
  • the shroud may further comprise a first sidewall that is fixed to the stepped conduit along a first longitudinal side edge of the stepped conduit, wherein the first sidewall extends around and encloses a first side surface of the aftertreatment device, wherein the first sidewall is disposed to provide a narrow gap between the first sidewall and the first side surface of the aftertreatment device to receive the flow of cleaning air from the stepped conduit over substantially the entire length of the aftertreatment device and to direct the flow of cleaning air generally downward over the first side surface of the aftertreatment device.
  • the shroud may further comprise a second sidewall that is fixed to the stepped conduit along a second longitudinal side edge of the stepped conduit and is disposed on an opposite side of the stepped conduit from the first sidewall, wherein the second sidewall extends around and encloses a second side surface of the aftertreatment device, wherein the second sidewall is disposed to provide a narrow gap between the second sidewall and the second side surface of the aftertreatment device to receive the flow of cleaning air from the stepped conduit over substantially the entire length of the aftertreatment device and to direct the flow of cleaning air generally downward over the second side surface of the aftertreatment device.
  • the aftertreatment device may be elongate, generally cylindrical, and may have a central longitudinal axis that extends generally horizontally.
  • the aftertreatment device can have a top surface, and the stepped conduit extends generally horizontally and is disposed immediately over the top surface of the aftertreatment device.
  • the first downwardly extending step and the second downwardly extending step may be disposed above the top surface of the aftertreatment device and may be spaced apart along the top surface of the aftertreatment device.
  • the first downwardly extending step may be disposed immediately downstream of a first protrusion that extends upwardly from the top surface of the aftertreatment device.
  • the second downwardly extending step maybe disposed immediately downstream of a second protrusion that extends upwardly from the top surface of the aftertreatment device.
  • Each of the first protrusion and the second protrusion may comprise an annular ring extending about a circumference of the aftertreatment device.
  • the aftertreatment device and the shroud described herein are mirror-symmetric about the vertically and longitudinally extending cutting plane of Figure 6 .
  • an aftertreatment device 100 is disposed in a shroud 102.
  • the body of the aftertreatment device 100 is generally cylindrical and has a longitudinal central axis 104.
  • An input exhaust conduit 106 that is generally cylindrical extends upward from a cylindrical side wall of the aftertreatment device 100 at a first end 108 of the aftertreatment device 100.
  • An output exhaust conduit 110 that is generally cylindrical extends outward from the aftertreatment device 100 at a second end 112 of the aftertreatment device 100.
  • the output exhaust conduit 110 is coaxial with the longitudinal central axis 104 of the aftertreatment device 100.
  • Exhaust gas is introduced into the input exhaust conduit 106.
  • the exhaust gas then traverses the body of the aftertreatment device 100.
  • the exhaust gas that exits the aftertreatment device 100 through the output exhaust conduit 110.
  • the shroud 102 surrounds substantially the entire aftertreatment device 100.
  • the shroud 102 is formed of a single layer of sheet metal.
  • the shroud 102 is spaced away from the outer surface of the aftertreatment device 100 to permit air introduced into the shroud 102 to flow over substantially the entire surface of the aftertreatment device 100.
  • This airflow performs a dual function.
  • the air flow cools the inner surface of the shroud 102, thereby decreasing the temperature of the shroud 102 and reducing the risk of fire.
  • the airflow also prevents the formation of a layer of combustible matter on the outer surface of the aftertreatment device 100.
  • the shroud 102 comprises an air inlet 114 is configured to receive air and conduct the air into the shroud 102 and across the upper surface of the aftertreatment device 100.
  • the air inlet 114 is located immediately adjacent to the input exhaust conduit 106 such that it directs air in a horizontal direction around both sides of the input exhaust conduit 106.
  • the shroud 102 further comprises a shell 116.
  • the shell 116 comprises a first sidewall 118, a second sidewall 120, a first endwall 122, a second endwall 124 and a stepped conduit 126.
  • the first sidewall 118 extends substantially the entire length of the aftertreatment device 100.
  • the first sidewall 118 wraps around and encloses a first side of the aftertreatment device 100.
  • the first sidewall 118 and the first side extend generally vertically.
  • the first sidewall 118 is spaced slightly away from the first side of the aftertreatment device 100 in order to provide a narrow gap 128 between the first sidewall 118 and the first side of the aftertreatment device 100.
  • the gap 128 forms an air channel that maintains a relatively constant airflow over substantially the entire first side of the aftertreatment device 100.
  • the second sidewall 120 extends substantially the entire length of the aftertreatment device 100.
  • the second sidewall 120 wraps around and encloses a second side of the aftertreatment device 100.
  • the second sidewall 120 and the second side extend generally vertically.
  • the second sidewall 120 is spaced slightly away from the second side of the aftertreatment device 100 in order to provide a narrow gap 130 between the second sidewall 120 and the second side of the aftertreatment device 100.
  • the gap 130 forms an air channel that maintains a relatively constant airflow over substantially the entire second side of the aftertreatment device 100.
  • An elongate outlet 132 is provided between the bottom edge of the first sidewall 118 and the second sidewall 120.
  • the elongate outlet 132 extends substantially the entire length of the aftertreatment device 100.
  • the elongate outlet 132 provides a flow path for air that is introduced into the air inlet 114 to escape from the space defined between the inner surface of the shroud 102 and the outer surface of the aftertreatment device 100.
  • the ends of the shroud 102 are defined by the first endwall 122 and the second endwall 124 which enclose the ends of the aftertreatment device 100.
  • the first endwall 122 is fixed to the first sidewall 118, the second sidewall 120, and the input exhaust conduit 106 to enclose the first end 108 of the aftertreatment device 100.
  • the second endwall 124 is fixed to the first sidewall 118, the second sidewall 120, and the stepped conduit 126 to enclose the second end 112 of the aftertreatment device 100.
  • the stepped conduit 126 forms the upper surface of the shroud 102.
  • the stepped conduit 126 encloses the upper surface of the aftertreatment device 100.
  • the stepped conduit 126 is fixed to and extends between the upper edges of the first sidewall 118 and the second sidewall 120.
  • the stepped conduit 126 extends substantially the entire length of the aftertreatment device 100 and is spaced away from the aftertreatment device 100 a distance substantially larger than the gap 128 or the gap 130.
  • the stepped conduit 126 has a decreased resistance to airflow in a direction parallel to the longitudinal extent of the aftertreatment device 100. This decreased resistance permits air to flow from the air inlet 114 at the first end 108 of the aftertreatment device 100, down the length of the stepped conduit 126 to the second end 112 of the aftertreatment device 100.
  • the cross-sectional area between the stepped conduit 126 and the top surface of the aftertreatment device 100 decreases over the length of the aftertreatment device 100 as the stepped conduit 126 extends from the first end 108 to the second end 112.
  • the cross-sectional area between the stepped conduit 126 and the surface of the aftertreatment device 100 over which it extends does not decrease gradually and uniformly over the length of the stepped conduit 126, however. It decreases in a stepwise fashion.
  • the inner surface (and in this case the outer surface as well, since the stepped conduit 126 is formed of a single layer of sheet metal) is provided with a series of three downward steps (a step 134, a step 136, and a step 138) in a top surface 140 of the stepped conduit 126, as well as a laterally inward step 142 on a first side surface 144 of the stepped conduit 126 and an opposing laterally inward step 146 on a second side surface 148 of the stepped conduit 126.
  • the laterally inward step 146 is on an opposing side of the stepped conduit 126 from the laterally inward step 142 on the first side surface 144.
  • step changes in the inner surface of the stepped conduit 126 is to cause a disruption in the smooth flow of the air traveling longitudinally down the stepped conduit 126. This disruption in the flow of air directs a greater portion of the air downward into the gap 128 and gap 130.
  • the scouring both removes pockets of otherwise combustible material that may have accumulated on the upper surface of the aftertreatment device 100. It also helps prevent the formation the formation of pockets of material on the upper surface of the aftertreatment device 100.
  • the upper surface of the aftertreatment device 100 has protrusions extending upwardly therefrom.
  • the protrusions comprise a first circumferential ring 150 and the second circumferential ring 152. In previous arrangements, dust and other combustible particles would accumulate on the upper and side surfaces of the aftertreatment device 100 downstream of these protrusions. The steps described herein.

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)
  • Cleaning In General (AREA)
EP14181137.2A 2013-09-27 2014-08-15 Stufenweise zusammenführende Abdeckung einer Nachbehandlungsvorrichtung Withdrawn EP2853709A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14/038,923 US20150089933A1 (en) 2013-09-27 2013-09-27 Stepped down aftertreatment device shroud

Publications (1)

Publication Number Publication Date
EP2853709A1 true EP2853709A1 (de) 2015-04-01

Family

ID=51357802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14181137.2A Withdrawn EP2853709A1 (de) 2013-09-27 2014-08-15 Stufenweise zusammenführende Abdeckung einer Nachbehandlungsvorrichtung

Country Status (4)

Country Link
US (1) US20150089933A1 (de)
EP (1) EP2853709A1 (de)
CA (1) CA2864511A1 (de)
EA (1) EA201400936A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372121A1 (de) * 2010-04-01 2011-10-05 Deere & Company Hitzeschild für einen Dieselpartikelfilter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130037158A1 (en) * 2011-08-11 2013-02-14 Jeffrey L. Gardner Engine exhaust assembly

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372121A1 (de) * 2010-04-01 2011-10-05 Deere & Company Hitzeschild für einen Dieselpartikelfilter

Also Published As

Publication number Publication date
CA2864511A1 (en) 2015-03-27
EA201400936A1 (ru) 2015-03-31
US20150089933A1 (en) 2015-04-02

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