US20150089933A1 - Stepped down aftertreatment device shroud - Google Patents
Stepped down aftertreatment device shroud Download PDFInfo
- Publication number
- US20150089933A1 US20150089933A1 US14/038,923 US201314038923A US2015089933A1 US 20150089933 A1 US20150089933 A1 US 20150089933A1 US 201314038923 A US201314038923 A US 201314038923A US 2015089933 A1 US2015089933 A1 US 2015089933A1
- Authority
- US
- United States
- 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.)
- Abandoned
Links
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
Images
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
- F01N13/14—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
- 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
- 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
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)
Abstract
A shroud (102) for an aftertreatment device (100) for treating exhaust gas from an internal combustion engine comprises a stepped conduit (126) configured to be disposed over an upper surface of the aftertreatment device (100) and extending over substantially the entire length of the aftertreatment device (100), wherein the stepped conduit (126) is configured to channel a flow of cleaning air longitudinally along the outer and upper surface of the aftertreatment device (100), wherein an inner surface of the stepped conduit (126) defines at least a first downwardly extending step (134, 136, 138) and a second downwardly extending step (134, 136, 138) that are spaced apart along the length of the aftertreatment device (100), to direct at least a portion of the flow of cleaning air downward.
Description
- 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.
- Modern internal combustion engines are provided with 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 fro being deposited on the surface.
- In one arrangement, 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.
- One problem with this arrangement is that impurities, dust, dirt and other combustible particles are deposited on the wall and gradually block the apertures themselves. Furthermore, the arrangement of a plenum enclosed at its bottom by a pierced wall reduced the power of the airflow and prevented it from thoroughly scrubbing the upper surfaces of the aftertreatment device.
- What is needed, therefore, is a new arrangement of an aftertreatment device shroud that provides for greater airflow, and better cleaning ability of the air and also reduces potential blockages of the airflow.
- It is an object of this invention to provide such an arrangement.
- In accordance with one aspect of the invention, a shroud (102) for an aftertreatment device (100) for treating exhaust gas from an internal combustion engine is provided, the shroud comprising: a stepped conduit (126) configured to be disposed over an upper surface of the aftertreatment device (100) and extending over substantially an entire length of the aftertreatment device (100), wherein the stepped conduit (126) is configured to channel a flow of cleaning air longitudinally along an outer and upper surface of the aftertreatment device (100), wherein an inner surface of the stepped conduit (126) defines at least a first downwardly extending step (134, 136, 138) and a second downwardly extending step (134, 136, 138) that are spaced apart along a length of the aftertreatment device (100), to direct at least a portion of the flow of cleaning air downward.
- The shroud ay further comprise a first sidewall (118) that is fixed to the stepped conduit (126) along a first longitudinal side edge of the stepped conduit (126), wherein the first sidewall (118) extends around and encloses a first side surface of the aftertreatment device (100), wherein the first sidewall (118) is disposed to provide a narrow gap (128) between the first sidewall (118) and the first side surface of the aftertreatment device (100) to receive the flow of cleaning air from the stepped conduit (126) over substantially the entire length of the aftertreatment device (100) and to direct the flow of cleaning air generally downward over the first side surface of the aftertreatment device (100).
- The shroud may further comprise a second sidewall (120) that is fixed to the stepped conduit (126) along a second longitudinal side edge of the stepped conduit (126) and is disposed on an opposite side of the stepped conduit (126) from the first sidewall (118), wherein the second sidewall (120) extends around and encloses a second side surface of the aftertreatment device (100), wherein the second sidewall (120) is disposed to provide a narrow gap (130) between the second sidewall (120) and the second side surface of the aftertreatment device (100) to receive the flow of cleaning air from the stepped conduit (126) over substantially the entire length of the aftertreatment device (100) and to direct the flow of cleaning air generally downward over the second side surface of the aftertreatment device (100).
- The aftertreatment device may be elongate, generally cylindrical, and may have a central longitudinal axis (104) that extends generally horizontally.
- 5. The shroud (102) of
claim 4, wherein the aftertreatment device (100) has a top surface, and wherein the stepped conduit (126) extends generally horizontally and is disposed immediately over the top surface of the aftertreatment device (100). - The first downwardly extending step (134, 136, 138) and the second downwardly extending step (134, 136, 138) maybe disposed above the top surface of the aftertreatment device (100) and maybe spaced apart along the top surface of the aftertreatment device (100).
- The first downwardly extending step (134, 136) maybe disposed immediately downstream of a first protrusion (150, 152) that extends upwardly from the top surface of the aftertreatment device (100).
- The second downwardly extending step (134, 136) maybe disposed immediately downstream of a second protrusion (150, 152) that extends upwardly fro the top surface of the aftertreatment device (100).
- Each of the first protrusion (150, 152) ad the second protrusion (150, 152) may comprise a an annular ring extending about a circumference of the aftertreatment device (100).
-
FIG. 1 is a perspective left side view of an aftertreatment device shroud enclosing an aftertreatment device in accordance with the present invention. -
FIG. 2 is a perspective right side view of the aftertreatment device shroud ofFIG. 1 . -
FIG. 3 is a bottom view of the aftertreatment device shroud ofFIGS. 1-2 . -
FIG. 4 is a vertical cross-sectional view of the aftertreatment device ofFIGS. 1-3 taken at section line 4-4 inFIG. 1 . The cutting plane defining the view ofFIG. 4 extends perpendicular to a longitudinal axis of the aftertreatment device and of the aftertreatment device shroud. -
FIG. 5 is a vertical cross-sectional view of the aftertreatment device ofFIGS. 1-4 taken at section line 5-5 inFIG. 1 . The cutting plane defining the view ofFIG. 5 extends perpendicular to a longitudinal axis of the aftertreatment device and of the aftertreatment device shroud. -
FIG. 6 is a cross-sectional view of the aftertreatment device ofFIGS. 1-5 taken at section line 6-6 inFIG. 1 . The cutting plane defining the view ofFIG. 6 extends vertically and extends longitudinally through the central longitudinal axis of the aftertreatment device. - The aftertreatment device and the shroud described herein are mirror-symmetric about the vertically and longitudinally extending cutting plane of
FIG. 6 . - In the Figures herein, an
aftertreatment device 100 is disposed in ashroud 102. The body of theaftertreatment device 100 is generally cylindrical and has a longitudinalcentral axis 104. Aninput exhaust conduit 106 that is generally cylindrical extends upward from a cylindrical side wall of theaftertreatment device 100 at afirst end 108 of theaftertreatment device 100. Anoutput exhaust conduit 110 that is generally cylindrical extends outward from theaftertreatment device 100 at asecond end 112 of theaftertreatment device 100. Theoutput exhaust conduit 110 is coaxial with the longitudinalcentral axis 104 of theaftertreatment device 100. - Exhaust gas is introduced into the
input exhaust conduit 106. The exhaust gas then traverses the body of theaftertreatment device 100. The exhaust gas that exits theaftertreatment device 100 through theoutput exhaust conduit 110. - The
shroud 102 surrounds substantially theentire aftertreatment device 100. Theshroud 102 is formed of a single layer of sheet metal. Theshroud 102 is spaced away from the outer surface of theaftertreatment device 100 to permit air introduced into theshroud 102 to flow over substantially the entire surface of theaftertreatment device 100. - This airflow performs a dual function. The air flow cools the inner surface of the
shroud 102, thereby decreasing the temperature of theshroud 102 and reducing the risk of fire. The airflow also prevents the formation of a layer of combustible matter on the outer surface of theaftertreatment device 100. - The
shroud 102 comprises anair inlet 114 is configured to receive air and conduct the air into theshroud 102 and across the upper surface of theaftertreatment device 100. Theair inlet 114 is located immediately adjacent to theinput exhaust conduit 106 such that it directs air in a horizontal direction around both sides of theinput exhaust conduit 106. - The
shroud 102 further comprises ashell 116. Theshell 116 comprises afirst sidewall 118, asecond sidewall 120, afirst endwall 122, asecond endwall 124 and astepped conduit 126. - The
first sidewall 118 extends substantially the entire length of theaftertreatment device 100. Thefirst sidewall 118 wraps around and encloses a first side of theaftertreatment device 100. Thefirst sidewall 118 and the first side extend generally vertically. Thefirst sidewall 118 is spaced slightly away from the first side of theaftertreatment device 100 in order to provide anarrow gap 128 between thefirst sidewall 118 and the first side of theaftertreatment device 100. Thegap 128 forms an air channel that maintains a relatively constant airflow over substantially the entire first side of theaftertreatment device 100. - The
second sidewall 120 extends substantially the entire length of theaftertreatment device 100. Thesecond sidewall 120 wraps around and encloses a second side of theaftertreatment device 100. Thesecond sidewall 120 and the second side extend generally vertically. Thesecond sidewall 120 is spaced slightly away from the second side of theaftertreatment device 100 in order to provide anarrow gap 130 between thesecond sidewall 120 and the second side of theaftertreatment device 100. Thegap 130 forms an air channel that maintains a relatively constant airflow over substantially the entire second side of theaftertreatment device 100. - An
elongate outlet 132 is provided between the bottom edge of thefirst sidewall 118 and thesecond sidewall 120. Theelongate outlet 132 extends substantially the entire length of theaftertreatment device 100. - The
elongate outlet 132 provides a flow path for air that is introduced into theair inlet 114 to escape from the space defined between the inner surface of theshroud 102 and the outer surface of theaftertreatment device 100. - The ends of the
shroud 102 are defined by thefirst endwall 122 and thesecond endwall 124 which enclose the ends of theaftertreatment device 100. - The
first endwall 122 is fixed to thefirst sidewall 118, thesecond sidewall 120, and theinput exhaust conduit 106 to enclose thefirst end 108 of theaftertreatment device 100. - The
second endwall 124 is fixed to thefirst sidewall 118, thesecond sidewall 120, and the steppedconduit 126 to enclose thesecond end 112 of theaftertreatment device 100. - The stepped
conduit 126 forms the upper surface of theshroud 102. The steppedconduit 126 encloses the upper surface of theaftertreatment device 100. The steppedconduit 126 is fixed to and extends between the upper edges of thefirst sidewall 118 and thesecond sidewall 120. The steppedconduit 126 extends substantially the entire length of theaftertreatment device 100 and is spaced away from the aftertreatment device 100 a distance substantially larger than thegap 128 or thegap 130. - Due to this larger spacing, the stepped
conduit 126 has a decreased resistance to airflow in a direction parallel to the longitudinal extent of theaftertreatment device 100. This decreased resistance permits air to flow from theair inlet 114 at thefirst end 108 of theaftertreatment device 100, down the length of the steppedconduit 126 to thesecond end 112 of theaftertreatment device 100. - The cross-sectional area between the stepped
conduit 126 and the top surface of theaftertreatment device 100 decreases over the length of theaftertreatment device 100 as the steppedconduit 126 extends from thefirst end 108 to thesecond end 112. - The cross-sectional area between the stepped
conduit 126 and the surface of theaftertreatment device 100 over which it extends does not decrease gradually and uniformly over the length of the steppedconduit 126, however. It decreases in a stepwise fashion. To provide this stepwise reduction the inner surface (and in this case the outer surface as well, since the steppedconduit 126 is formed of a single layer of sheet metal) is provided with a series of three downward steps (astep 134, astep 136, and a step 138) in atop surface 140 of the steppedconduit 126, as well as a laterallyinward step 142 on afirst side surface 144 of the steppedconduit 126 and an opposing laterallyinward step 146 on asecond side surface 148 of the steppedconduit 126. The laterallyinward step 146 is on an opposing side of the steppedconduit 126 from the laterally inward step 142 o thefirst side surface 144. - The effect of these 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 steppedconduit 126. This disruption in the flow of air directs a greater portion of the air downward into thegap 128 andgap 130. - This downward flow improves the scouring of the upper surface of the
aftertreatment device 100. The scouring both removes pockets of otherwise combustible material that may have accumulated on the upper surface of theaftertreatment device 100. It also helps prevent the formation the formation of pockets of material on the upper surface of theaftertreatment device 100. The upper surface of theaftertreatment device 100 has protrusions extending upwardly therefrom. The protrusions comprise a firstcircumferential ring 150 and the secondcircumferential ring 152. In previous arrangements, dust and other combustible particles would accumulate on the upper and side surfaces of theaftertreatment device 100 downstream of these protrusions. The steps described herein. - It should be understood that the particular arrangements shown and described in this document are not the only ways in which the invention can be created. The arrangements shown in this document are the currently preferred embodiments of the invention. However, one skilled in the art of agricultural harvester design and manufacture can readily see other variations that would also be protected by the claims of this document.
Claims (9)
1. A shroud (102) for an aftertreatment device (100) for treating exhaust gas from an internal combustion engine, the shroud comprising:
a stepped conduit (126) configured to be disposed over an upper surface of the aftertreatment device (100) and extending over substantially an entire length of the aftertreatment device (100), wherein the stepped conduit (126) is configured to channel a flow of cleaning air longitudinally along an outer and upper surface of the aftertreatment device (100), wherein an inner surface of the stepped conduit (126) defines at least a first downwardly extending step (134, 136, 138) and a second downwardly extending step (134, 136, 138) that are spaced apart along a length of the aftertreatment device (100), to direct at least a portion of the flow of cleaning air downward.
2. The shroud (102) of claim 1 , further comprising a first sidewall (118) that is fixed to the stepped conduit (126) along a first longitudinal side edge of the stepped conduit (126), wherein the first sidewall (118) extends around and encloses a first side surface of the aftertreatment device (100), wherein the first sidewall (118) is disposed to provide a narrow gap (128) between the first sidewall (118) and the first side surface of the aftertreatment device (100) to receive the flow of cleaning air from the stepped conduit (126) over substantially the entire length of the aftertreatment device (100) and to direct the flow of cleaning air generally downward over the first side surface of the aftertreatment device (100).
3. The shroud (102) of claim 2 , further comprising a second sidewall (120) that is fixed to the stepped conduit (126) along a second longitudinal side edge of the stepped conduit (126) and is disposed on an opposite side of the stepped conduit (126) from the first sidewall (118), wherein the second sidewall (120) extends around and encloses a second side surface of the aftertreatment device (100), wherein the second sidewall (120) is disposed to provide a narrow gap (130) between the second sidewall (120) and the second side surface of the aftertreatment device (100) to receive the flow of cleaning air from the stepped conduit (126) over substantially the entire length of the aftertreatment device (100) and to direct the flow of cleaning air generally downward over the second side surface of the aftertreatment device (100).
4. The shroud (102) of claim 1 , wherein the aftertreatment device (100) is elongate, generally cylindrical, and has a central longitudinal axis (104) that extends generally horizontally.
5. The shroud (102) of claim 4 , wherein the aftertreatment device (100) has a top surface, and wherein the stepped conduit (126) extends generally horizontally and is disposed immediately over the top surface of the aftertreatment device (100).
6. The shroud (102) of claim 5 , wherein the first downwardly extending step (134, 136, 138) and the second downwardly extending step (134, 136, 138) are disposed above the top surface of the aftertreatment device (100) and are spaced apart along the top surface of the aftertreatment device (100).
7. The shroud (102) of claim 6 , wherein the first downwardly extending step (134, 136) is disposed immediately downstream of a first protrusion (150, 152) that extends upwardly from the top surface of the aftertreatment device (100).
8. The shroud (102) of claim 7 , wherein the second downwardly extending step (134, 136) is disposed immediately downstream of a second protrusion (150, 152) that extends upwardly from the top surface of the aftertreatment device (100).
9. The shroud (102) of claim 8 , wherein each of the first protrusion (150, 152) and the second protrusion (150, 152) comprises an annular ring extending about a circumference of the aftertreatment device (100).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/038,923 US20150089933A1 (en) | 2013-09-27 | 2013-09-27 | Stepped down aftertreatment device shroud |
EP14181137.2A EP2853709A1 (en) | 2013-09-27 | 2014-08-15 | Stepped down aftertreatment device shroud |
EA201400936A EA201400936A1 (en) | 2013-09-27 | 2014-09-19 | STEP BY DOWN THE REDUCING LEATHER OF THE SUBSEQUENT HANDLING DEVICE |
CA2864511A CA2864511A1 (en) | 2013-09-27 | 2014-09-23 | Stepped down aftertreatment device shroud |
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 |
---|---|
US20150089933A1 true US20150089933A1 (en) | 2015-04-02 |
Family
ID=51357802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/038,923 Abandoned US20150089933A1 (en) | 2013-09-27 | 2013-09-27 | Stepped down aftertreatment device shroud |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150089933A1 (en) |
EP (1) | EP2853709A1 (en) |
CA (1) | CA2864511A1 (en) |
EA (1) | EA201400936A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110239980A1 (en) * | 2010-04-01 | 2011-10-06 | Batzold James Patrick O'neil | Cover For A Diesel Particulate Filter |
US20130037158A1 (en) * | 2011-08-11 | 2013-02-14 | Jeffrey L. Gardner | Engine exhaust assembly |
-
2013
- 2013-09-27 US US14/038,923 patent/US20150089933A1/en not_active Abandoned
-
2014
- 2014-08-15 EP EP14181137.2A patent/EP2853709A1/en not_active Withdrawn
- 2014-09-19 EA EA201400936A patent/EA201400936A1/en unknown
- 2014-09-23 CA CA2864511A patent/CA2864511A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110239980A1 (en) * | 2010-04-01 | 2011-10-06 | Batzold James Patrick O'neil | Cover For A Diesel Particulate Filter |
US20130037158A1 (en) * | 2011-08-11 | 2013-02-14 | Jeffrey L. Gardner | Engine exhaust assembly |
Also Published As
Publication number | Publication date |
---|---|
EA201400936A1 (en) | 2015-03-31 |
EP2853709A1 (en) | 2015-04-01 |
CA2864511A1 (en) | 2015-03-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DEERE & COMPANY, ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:XIJUN, WANG;MATTSON, MARK L;CHOUDARY, NITHIN;SIGNING DATES FROM 20130927 TO 20130929;REEL/FRAME:032855/0414 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |