WO2021213146A1 - 尾气后处理封装 - Google Patents

尾气后处理封装 Download PDF

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Publication number
WO2021213146A1
WO2021213146A1 PCT/CN2021/083974 CN2021083974W WO2021213146A1 WO 2021213146 A1 WO2021213146 A1 WO 2021213146A1 CN 2021083974 W CN2021083974 W CN 2021083974W WO 2021213146 A1 WO2021213146 A1 WO 2021213146A1
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WO
WIPO (PCT)
Prior art keywords
baffle
exhaust gas
post
mixing tube
carrier assembly
Prior art date
Application number
PCT/CN2021/083974
Other languages
English (en)
French (fr)
Inventor
李伟
Original Assignee
天纳克（苏州）排放系统有限公司
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 天纳克（苏州）排放系统有限公司 filed Critical 天纳克（苏州）排放系统有限公司
Publication of WO2021213146A1 publication Critical patent/WO2021213146A1/zh

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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
    • F01N13/009—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 two or more separate purifying devices arranged in series
    • F01N13/0097—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 two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
    • B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
    • 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
    • F01N13/011—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 two or more purifying devices arranged in parallel
    • F01N13/017—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 two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus

Definitions

  • the invention relates to a tail gas post-treatment package, belonging to the technical field of engine tail gas post-treatment.
  • existing exhaust gas aftertreatment packages usually include diesel oxidation catalyst, diesel particulate trap, selective catalytic reduction agent, and the diesel particulate trap installed in the diesel particulate trap and the selective catalytic reduction Mixing tube assembly between agents.
  • diesel oxidation catalyst diesel particulate trap
  • selective catalytic reduction agent selective catalytic reduction agent
  • the diesel particulate trap installed in the diesel particulate trap and the selective catalytic reduction Mixing tube assembly between agents.
  • the purpose of the present invention is to provide a low-cost exhaust gas post-treatment package.
  • an exhaust gas after-treatment package which includes an outer shell, a first baffle and a second baffle located in the outer shell and spaced apart, and a second baffle located in the outer shell.
  • the first baffle is provided with a first side facing the second baffle and a second side opposite to the first side
  • the second baffle is provided with a first facing the first baffle Three side surfaces and a fourth side surface opposite to the third side surface
  • the third after-treatment carrier assembly includes a third shell and a third catalyst carrier packaged in the third shell
  • the exhaust gas after-treatment package includes A first connection cavity located on the fourth side surface of the second baffle and a second connection cavity located between the first baffle and the second baffle
  • the third housing is provided with The plurality of protrusions on which the second baffle is fixed, and an airflow channel between two adjacent protrusions, the airflow channel penetrates the second baffle, and the first connection cavity is connected to the The second post-processing carrier assembly is in communication, and the second connection cavity is in communication
  • the first baffle is provided with a positioning opening for positioning the third housing
  • the second baffle is provided with an opening
  • the plurality of protrusions are welded and fixed to the On the third side surface, the air flow channel communicates with the opening.
  • the first baffle is provided with a second convex hull formed by stamping and protruding from the fourth side surface, the second convex hull forms the opening, and the second The convex hull is provided with a third connection cavity communicating with the entrance of the third post-processing carrier assembly.
  • the mixing tube assembly includes an end extending into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle plate, and the end is connected to the second baffle plate. There is a gap between a baffle.
  • the mixing tube assembly includes a mixing tube and an expansion tube sleeved on the mixing tube, and the mixing tube is provided with a plurality of swirling fluids communicating with the first connecting cavity.
  • the second baffle plate is provided with an opening, the swirl plate is suspended in the opening, and the mixing tube passes through the opening; wherein the swirl plate protrudes from the second baffle plate The four sides extend into the first connecting cavity, and the swirl plate protrudes from the third side surface of the second baffle to extend into the expansion tube; the expansion tube is fixed to the second block The third side of the board is sealed on the periphery of the opening.
  • the expansion cylinder is provided with an expansion cavity and an end wall, the expansion cavity is in communication with the opening; the end wall is provided with a perforation for the mixing tube to pass through, And the mixing tube is fixed on the end wall, and the end is located on the mixing tube.
  • the first baffle is provided with an arc-shaped recess corresponding to the end, and the arc-shaped recess is recessed from the first side surface to the second side surface.
  • the exhaust gas post-treatment package includes a mounting cover mounted on the mixing tube and a urea nozzle mounting seat fixed on the mounting cover, wherein the mounting cover and the end are respectively Located at both ends of the mixing pipe; the mounting cover is provided with a first raised portion and a number of positioning grooves located on the periphery of the first raised portion, the first raised portion is provided with mounting holes; the urea nozzle is installed
  • the seat is provided with a plurality of positioning feet clamped in the plurality of positioning grooves and a second protruding portion protruding to the first protruding portion, and the second protruding portion is inserted into the mounting hole and is connected to the mounting cover It is fixed by welding, and the second raised portion is provided with a nozzle hole for installing a urea nozzle.
  • the exhaust gas aftertreatment package includes a first convex hull fixed on the fourth side surface of the second baffle, and the first connecting cavity is formed in the first convex hull .
  • the second aftertreatment carrier assembly includes a second shell and a diesel particulate trap packaged in the second shell;
  • the exhaust gas aftertreatment package includes A cylindrical portion of the periphery of the second housing, and the second post-processing carrier assembly is detachably installed in the cylindrical portion.
  • the present invention is easy to fix the third housing to the second baffle by arranging a number of protrusions on the third housing for fixing to the second baffle; Adjacent to the airflow channel between the two protrusions, and make the airflow channel penetrate the second baffle to communicate with the third post-processing carrier assembly, omit additional flow guide elements, and reduce the cost of exhaust gas post-processing packaging .
  • Fig. 1 is a three-dimensional schematic diagram of the exhaust gas post-treatment package of the present invention in the first embodiment.
  • Fig. 2 is a front view of Fig. 1.
  • Fig. 3 is a partially exploded perspective view of Fig. 1.
  • Fig. 4 is a further perspective exploded view of Fig. 3.
  • Fig. 5 is a perspective schematic view of the outer shell in Fig. 1 removed.
  • Fig. 6 is a perspective schematic view of Fig. 5 from another angle.
  • Fig. 7 is a plan view of Fig. 6.
  • Fig. 8 is a partially exploded perspective view of Fig. 5.
  • Fig. 9 is a partially exploded perspective view of Fig. 6.
  • Fig. 10 is a further perspective exploded view of Fig. 9.
  • Figure 11 is a perspective schematic view of an end cap assembly.
  • Fig. 12 is a perspective schematic view of Fig. 11 from another angle.
  • Fig. 13 is an exploded perspective view of Fig. 11.
  • Fig. 14 is a schematic cross-sectional view taken along the line D-D in Fig. 2.
  • Fig. 15 is a partial enlarged view of the circled part E in Fig. 14.
  • Fig. 16 is a schematic cross-sectional view taken along the line F-F in Fig. 2.
  • Fig. 17 is a schematic cross-sectional view taken along line G-G in Fig. 2.
  • Fig. 18 is a schematic cross-sectional view taken along line H-H in Fig. 2.
  • the present invention discloses an exhaust gas after-treatment package 100, which includes an outer shell 1, a first baffle 21 and a second baffle 22 located in the outer shell 1 and spaced apart. , The intake pipe 31 for the exhaust gas to enter, the exhaust pipe 32 for the exhaust gas to flow out, the first post-treatment carrier assembly 51, the second post-treatment carrier assembly 52, the third post-treatment carrier assembly 53, the mixing tube assembly 6, and The bracket assembly 7 is installed on the outer shell 1.
  • the first post-processing carrier assembly 51 includes a first housing 511 and a diesel oxidation catalyst (DOC) 512 enclosed in the first housing 511;
  • the processing carrier assembly 52 includes a second housing 521 and a diesel particulate filter (DPF) 522 enclosed in the second housing 521;
  • the third post-processing carrier assembly 53 includes a third housing 531 and is enclosed in The third catalyst carrier 532 in the third housing 531, the third catalyst carrier 532 may be a selective catalytic reduction agent (SCR).
  • SCR selective catalytic reduction agent
  • the third post-processing carrier assembly 53 is two groups arranged side by side.
  • the second post-treatment carrier assembly 52 is located downstream of the first post-treatment carrier assembly 51, and the third post-treatment carrier assembly 53 is located at the second post-treatment carrier assembly 52 downstream.
  • the mixing tube assembly 6 communicates between the second post-processing carrier assembly 52 and the third post-processing carrier assembly 53.
  • the first baffle 21 has a first side surface 211 facing the second baffle 22 and a second side surface 212 opposite to the first side surface 211.
  • the second baffle 22 has a third side 221 facing the first baffle 21 and a fourth side 222 opposite to the third side 221.
  • the exhaust gas after-treatment package 100 includes an intake convex hull 43 fixed to the second side surface 212 of the first baffle 21 by welding, and fixed to the first baffle 21 by welding.
  • the intake convex hull 43 is provided with an intake cavity 431, wherein one end of the intake cavity 431 (for example, the upper end in FIG. 8) communicates with the intake pipe 31, and the intake cavity 431 The other end (for example, the lower end in FIG. 8) is in communication with the inlet of the first post-processing carrier assembly 51.
  • the air outlet protrusion 44 is provided with an air outlet cavity 441 communicating with the outlet of the third post-processing carrier assembly 53, and the air outlet pipe 32 is communicated with the air outlet cavity 441.
  • the first convex hull 41 is provided with a first connecting cavity 411.
  • the exhaust gas after-treatment package 100 includes a second connecting cavity 412 between the first baffle 21 and the second baffle 22.
  • the first connecting cavity 411 communicates with the second post-processing carrier assembly 52, and the second connecting cavity 412 communicates with the third post-processing carrier assembly 53.
  • the air inlet pipe 31 is approximately located in the second connecting cavity 412 and penetrates the first baffle 21.
  • the first baffle 21 further includes a positioning opening 213 for positioning the third housing 531.
  • the first baffle 21 is also provided with an arc-shaped recess 214 corresponding to the mixing tube assembly 6, and the arc-shaped recess 214 extends from the first side surface. 211 is recessed toward the second side surface 212.
  • the arc-shaped recess 214 is used to reverse the air flow to improve the uniformity of the air flow.
  • the second baffle 22 is provided with an opening 223 matched with the mixing tube assembly 6 and a second convex hull 42 formed by stamping and protruding from the fourth side surface 222. In the process of forming the second convex hull 42, an opening 224 is also formed on the second baffle 22.
  • the second convex hull 42 is provided with a third connection cavity 421 communicating with the entrance of the third post-processing carrier assembly 53.
  • the mixing tube assembly 6 includes a mixing tube 61 and an expansion tube 62 sleeved on the mixing tube 61.
  • the mixing tube 61 is provided with a plurality of swirling fins 611 communicating with the first connecting cavity 411. Please refer to FIG. 9 and FIG. 17, the swirl plate 611 is suspended in the opening 223.
  • the mixing tube 61 passes through the opening 223. Specifically, the swirl plate 611 protrudes from the fourth side surface 222 of the second baffle 22 to extend into the first connecting cavity 411, and the swirl plate 611 protrudes from the second baffle
  • the third side surface 221 of 22 extends into the expansion tube 62.
  • the expansion barrel 62 is fixed on the third side surface 221 of the second baffle 22 and sealed on the periphery of the opening 223.
  • the expansion cylinder 62 is provided with an expansion cavity 621 and an end wall 622, and the expansion cavity 621 is in communication with the opening 223; the end wall 622 is provided with a perforation 6221 through which the mixing tube 61 passes, and The mixing tube 61 is fixed on the end wall 622.
  • the mixing tube 61 includes an end 612 extending into the second connecting cavity 412, wherein there is a gap 613 between the end 612 and the first baffle 21.
  • the exhaust gas post-treatment package 100 further includes a mounting cover 63 mounted on the mixing pipe 61 and a urea nozzle mounting seat 64 fixed on the mounting cover 63, wherein the The mounting cover 63 and the end 612 are respectively located at the two ends of the mixing tube 61.
  • the mounting cover 63 is provided with a first protruding portion 631 in the center and a plurality of positioning grooves 632 located on the periphery of the first protruding portion 631, and the first protruding portion 631 is provided with a mounting hole 6311.
  • the urea nozzle mounting seat 64 is provided with a plurality of positioning feet 642 clamped in the plurality of positioning grooves 632 and a second protruding portion 641 protruding toward the first protruding portion 631.
  • the second protruding portion 641 is inserted into the mounting hole 6311 and fixed to the mounting cover 63 by welding.
  • the second raised portion 641 is provided with a nozzle hole 6411 for installing a urea nozzle.
  • the outer circumference of the urea nozzle mounting seat 64 is optimized to have a welding concession portion 643, so that the welding torch can be extended to fix the mounting cover 63 by welding. To the mixing tube 61.
  • the exhaust gas after-treatment package 100 includes a cylindrical portion 23 penetrating the first baffle 21 and the second baffle 22.
  • the cylindrical portion 23 is welded and fixed to the first baffle 21 and the second baffle 22.
  • the first housing 511 and the second housing 521 are both contained in the cylindrical portion 23.
  • the barrel portion 23 is provided with a first protrusion 231 (for example, a flaring or a flange) protruding outward in the radial direction.
  • the second housing 521 is provided with a second protrusion 520 protruding radially outward.
  • the exhaust gas post-treatment package 100 further includes a sealing member 523 clamped between the first protrusion 231 and the second protrusion 520.
  • the sealing member 523 is a sealing gasket sleeved on the second housing 521.
  • the exhaust gas after-treatment package 100 further includes a connecting member 524 fixed to the second housing 521.
  • the connecting member 524 is an end plate 525 located on the end surface of the second housing 521, and the end plate 525 is provided with a plurality of pressing surfaces 5251 . In the illustrated embodiment of the present invention, there are three pressing surfaces 5251 and are evenly distributed along the circumferential direction.
  • the outer shell 1 is provided with an opening 111 for detaching the second post-processing carrier assembly 52.
  • the exhaust gas after-treatment package 100 includes an end cover assembly 112 for mating with the opening 111 and a clamp 115 for detaching the end cover assembly 112.
  • the outer shell 1 is provided with a first flange 1111 located at the opening 111.
  • the end cover assembly 112 includes an end cover 1121, a second flange 1122 formed on the end cover 1121, and a force applying component installed on the end cover 1121.
  • the exhaust gas post-treatment package 100 further includes a first sealing gasket 114 clamped between the first flange 1111 and the second flange 1122 to achieve better sealing.
  • the force application member passes through the end cover 1121, and can push the connecting member 524 so that the second housing 521 closely abuts on the sealing member 523, so as to achieve a better seal.
  • the force applying component is a bolt assembly 113.
  • the bolt assembly 113 is in three groups, and each group includes a bolt 1131 and an internal thread that matches with the bolt 1131.
  • each group includes a bolt 1131 and an internal thread that matches with the bolt 1131.
  • the bolt 1131 is rotated, the length of the bolt 1131 protruding from the end cover 1121 can be adjusted; when the length of the bolt 1131 protruding from the end cover 1121 increases, the bolt 1131 can push the second post-processing carrier assembly 52
  • the second housing 521 moves to achieve better sealing.
  • each set of bolt assemblies 113 includes two nuts, and the internal threads are formed on the inner surfaces of the two nuts.
  • One of the nuts is welded and fixed on the end cover 1121, and the other nut is close to the nut.
  • the bolt 1131 passes through these two nuts.
  • the third housing 531 is provided with a plurality of protrusions 5311 fixed to the second baffle 22 and located between two adjacent protrusions 5311
  • the airflow channel 5312 penetrates the second baffle 22.
  • the second connection cavity 412 communicates with the airflow channel 5312
  • the airflow channel 5312 communicates with the opening 224
  • the opening 224 communicates with the third connection cavity 421
  • the third connection cavity 421 communicates with the entrance of the third post-processing carrier assembly 53.
  • the plurality of protrusions 5311 are fixed to the third side surface 221 by welding.
  • the bracket assembly 7 includes a first bracket 71 and a second bracket 72 arranged in parallel, a first connecting portion 73 and a second connecting portion 74 connecting the first bracket 71 and the second bracket 72, and connected to the first bracket 71 and the second bracket 72.
  • the two sets of rope assemblies 75 on the first bracket 71 and the second bracket 72 are described.
  • the rope assembly 75 is tied to the outer shell 1.
  • the exhaust gas of the engine flows from the intake pipe 31 into the exhaust gas aftertreatment package 100; then, the exhaust gas enters the intake cavity 431 and flows to the inlet of the first aftertreatment carrier assembly 51; then, the exhaust gas passes through the first aftertreatment carrier assembly 51
  • the processing carrier assembly 51 and the second post-processing carrier assembly 52 enter the first connection cavity 411; then, the tail gas spin vane 611 rotates into the mixing tube 61; when the injection conditions are met, the urea nozzle
  • the atomized urea droplets are sprayed into the mixing pipe 61.
  • the urea droplets are pyrolyzed and hydrolyzed to produce ammonia under the action of the exhaust gas heat, and chemically react with the exhaust gas to reduce the concentration of harmful substances; the air flow is from the mixing pipe 61
  • the end 612 enters the second connecting cavity 412; then, the airflow enters the third connecting cavity 421 through the airflow channel 5312, and passes through the two sets of third post-processing carrier assemblies 53; then, the airflow enters the air outlet cavity 441, and finally leave from the outlet pipe 32.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Transportation (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

一种尾气后处理封装，其包括外壳体（1）、位于外壳体（1）内且间隔布置的第一挡板（21）与第二挡板（22）、第三后处理载体组件（53）以及混合管组件（6）。第三后处理载体组件（53）包括第三壳体（531）以及封装在第三壳体（531）内的第三催化剂载体（532）。第三壳体（531）设有与第二挡板（22）进行固定的若干凸起部（5311）以及位于相邻两个凸起部之间的气流通道（5312），气流通道（5312）贯穿第二挡板以与第三后处理载体组件（53）相连通。通过在第三壳体（531）上设置若干凸起部（5311），易于将第三壳体（531）固定到第二挡板上（22）；另外，通过设计气流通道（5312），并使气流通道（5312）贯穿第二挡板（22）以与第三后处理载体组件（53）相连通，省略了额外的导流元件，降低了尾气后处理封装的成本。

Description

尾气后处理封装
本申请要求了申请日为2020年04月21日、申请号为202010315418.7、发明名称为“尾气后处理封装”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种尾气后处理封装，属于发动机尾气后处理技术领域。
背景技术
随着排放法规的不断升级，现有的尾气后处理封装通常都包括柴油氧化催化剂、柴油颗粒捕集器、选择性催化还原剂以及安装在所述柴油颗粒捕集器与所述选择性催化还原剂之间的混合管组件。当气流从混合组件中流出，在进入选择性催化还原剂之前，通常需要设计导流结构。这种设计，一方面增加了零件的数量，另一方面提高选择性催化还原组件在安装到挡板上时的同轴度要求，导致成本增加。
发明内容
本发明的目的在于提供一种成本较低的尾气后处理封装。
为实现上述目的，本发明采用如下技术方案：一种尾气后处理封装，其包括外壳体、位于所述外壳体内且间隔布置的第一挡板与第二挡板、位于所述外壳体内的第二后处理载体组件、位于所述第二后处理载体组件的下游的第三后处理载体组件以及连通在所述第二后处理载体组件与所述第三后处理载体组件之间的混合管组件；所述第一挡板设有面向所述第二挡板的第一侧面以及与所述第一侧面相对的第二侧面，所述第二挡板设有面向所述第一挡板的第三侧面以及与所述第三侧面相对的第四侧面；所述第三后处理载体组件包括第三壳体以及封装在所述第三壳体内的第三催化剂载体，所述尾气后处理封装包括位于 所述第二挡板的第四侧面的第一连接腔体以及位于所述第一挡板与所述第二挡板之间的第二连接腔体，所述第三壳体设有与所述第二挡板进行固定的若干凸起部以及位于相邻两个凸起部之间的气流通道，所述气流通道贯穿所述第二挡板，所述第一连接腔体与所述第二后处理载体组件相连通，所述第二连接腔体通过所述气流通道与所述第三后处理载体组件相连通。
作为本发明进一步改进的技术方案，所述第一挡板设有定位所述第三壳体的定位开孔，所述第二挡板设有开口部，所述若干凸起部焊接固定到所述第三侧面，所述气流通道与所述开口部相连通。
作为本发明进一步改进的技术方案，所述第一挡板设有冲压成型且凸出所述第四侧面的第二凸包，所述第二凸包形成了所述开口部，所述第二凸包设有与所述第三后处理载体组件的入口相连通的第三连接腔体。
作为本发明进一步改进的技术方案，所述混合管组件包括延伸入所述第二连接腔体内的末端，其中所述混合管组件与所述第二挡板相固定，所述末端与所述第一挡板之间具有间隙。
作为本发明进一步改进的技术方案，所述混合管组件包括混合管以及套接在所述混合管上的扩展筒，所述混合管设有与所述第一连接腔体相连通的若干旋流片，所述第二挡板设有开口，所述旋流片悬空设置在所开口中，所述混合管穿过所述开口；其中所述旋流片凸出所述第二挡板的第四侧面以延伸入所述第一连接腔体内，所述旋流片凸出所述第二挡板的第三侧面以延伸入所述扩展筒内；所述扩展筒固定在所述第二挡板的第三侧面且密封在所述开口的外围。
作为本发明进一步改进的技术方案，所述扩展筒设有扩展腔体以及端壁，所述扩展腔体与所述开口相连通；所述端壁设有让所述混合管穿过的穿孔，且所述混合管固定在所述端壁上，所述末端位于所述混合管上。
作为本发明进一步改进的技术方案，所述第一挡板设有对应于所述末端的弧形凹陷部，所述弧形凹陷部自所述第一侧面向所述第二侧面凹陷。
作为本发明进一步改进的技术方案，所述尾气后处理封装包括安装在所述混合管上的安装盖以及固定在所述安装盖上的尿素喷嘴安装座，其中所述安装 盖与所述末端分别位于所述混合管的两端；所述安装盖设有第一隆起部以及位于所述第一隆起部的外围的若干定位槽，所述第一隆起部设有安装孔；所述尿素喷嘴安装座设有卡持在所述若干定位槽中的若干定位脚以及向所述第一隆起部凸出的第二隆起部，所述第二隆起部插入所述安装孔中且与所述安装盖焊接固定，所述第二隆起部设有用以安装尿素喷嘴的喷嘴孔。
作为本发明进一步改进的技术方案，所述尾气后处理封装包括固定在所述第二挡板的第四侧面的第一凸包，所述第一连接腔体形成在所述第一凸包内。
作为本发明进一步改进的技术方案，所述第二后处理载体组件包括第二壳体以及封装在所述第二壳体内的柴油颗粒捕集器；所述尾气后处理封装包括套接在所述第二壳体的外围的筒体部，所述第二后处理载体组件可拆卸地安装在所述筒体部内。
相较于现有技术，本发明通过在第三壳体上设置与第二挡板进行固定的若干凸起部，易于将第三壳体固定到第二挡板上；另外，通过设置位于相邻两个凸起部之间的气流通道，并使所述气流通道贯穿第二挡板以与第三后处理载体组件相连通，省略了额外的导流元件，降低了尾气后处理封装的成本。
附图说明
图1是本发明尾气后处理封装在第一实施方式中的立体示意图。
图2是图1的主视图。
图3是图1的部分立体分解图。
图4是图3进一步的立体分解图。
图5是去除图1中外壳体后的立体示意图。
图6是图5另一角度的立体示意图。
图7是图6的俯视图。
图8是图5的部分立体分解图。
图9是图6的部分立体分解图。
图10是图9进一步的立体分解图。
图11是端盖组件的立体示意图。
图12是图11另一角度的立体示意图。
图13是图11的立体分解图。
图14是沿图2中D-D线的剖面示意图。
图15是图14中画圈部分E的局部放大图。
图16是沿图2中F-F线的剖面示意图。
图17是沿图2中G-G线的剖面示意图。
图18是沿图2中H-H线的剖面示意图。
具体实施方式
下面将结合附图详细地对本发明的具体实施方式进行描述，其中如果存在若干具体实施方式，在不冲突的情况下，这些实施方式中的特征可以相互组合。当描述涉及附图时，除非另有说明，不同附图中相同的数字或者符号表示相同或相似的要素。以下示例性具体实施方式中所描述的内容并不代表本发明的所有实施方式，相反，它们仅是与本发明的权利要求书中所记载的、与本发明相一致的产品的例子。
在本发明中使用的术语是仅仅出于描述具体实施方式的目的，而非旨在限制本发明的保护范围。应当理解，本发明的说明书以及权利要求书中所使用的，例如“第一”、“第二”以及类似的词语，并不表示任何顺序、数量或者重要性，而只是用来区分特征的命名。
请参图1至图18所示，本发明揭示了一种尾气后处理封装100，其包括外壳体1、位于所述外壳体1内且间隔布置的第一挡板21与第二挡板22、用以供尾气进入的进气管31、用以供尾气流出的出气管32、第一后处理载体组件51、第二后处理载体组件52、第三后处理载体组件53、混合管组件6以及安装在所述外壳体1上的支架组件7。
在本发明的一种实施方式中，所述第一后处理载体组件51包括第一壳体511以及封装在所述第一壳体511内的柴油氧化催化剂(DOC)512；所述第二后处理载体组件52包括第二壳体521以及封装在所述第二壳体521内的柴油颗粒捕集器(DPF)522；所述第三后处理载体组件53包括第三壳体531以及封 装在所述第三壳体531内的第三催化剂载体532，所述第三催化剂载体532可以为选择性催化还原剂(SCR)。在本发明图示的实施方式中，所述第三后处理载体组件53为并排布置的两组。在本发明图示的实施方式中，所述第二后处理载体组件52位于所述第一后处理载体组件51的下游，所述第三后处理载体组件53位于所述第二后处理载体组件52的下游。所述混合管组件6连通在所述第二后处理载体组件52与所述第三后处理载体组件53之间。
请参照图5及图6所示，所述第一挡板21设有面向所述第二挡板22的第一侧面211以及与所述第一侧面211相对的第二侧面212。所述第二挡板22设有面向所述第一挡板21的第三侧面221以及与所述第三侧面221相对的第四侧面222。
在本发明图示的实施方式中，所述尾气后处理封装100包括焊接固定在所述第一挡板21的第二侧面212的进气凸包43、焊接固定在所述第一挡板21的第二侧面212的出气凸包44、以及焊接固定在所述第二挡板22的第四侧面222的第一凸包41。所述进气凸包43设有进气腔体431，其中所述进气腔体431的一端(例如图8中的上端)与所述进气管31相连通，所述进气腔体431的另一端(例如图8中的下端)与所述第一后处理载体组件51的入口相连通。所述出气凸包44设有与所述第三后处理载体组件53的出口相连通的出气腔体441，所述出气管32与所述出气腔体441相连通。
所述第一凸包41设有第一连接腔体411。所述尾气后处理封装100包括位于所述第一挡板21与所述第二挡板22之间的第二连接腔体412。所述第一连接腔体411与所述第二后处理载体组件52相连通，所述第二连接腔体412与所述第三后处理载体组件53相连通。
在本发明图示的实施方式中，所述进气管31大致位于所述第二连接腔体412内，且贯穿所述第一挡板21。所述第一挡板21还包括用以定位所述第三壳体531的定位开孔213。此外，请参照图8及图16所示，所述第一挡板21还设有对应于所述混合管组件6的弧形凹陷部214，所述弧形凹陷部214自所述第一侧面211向所述第二侧面212凹陷。所述弧形凹陷部214用以对气流进行 反向，以提高气流的均匀性。
所述第二挡板22设有与所述混合管组件6相配合的开口223以及冲压成型且凸出所述第四侧面222的第二凸包42。在形成所述第二凸包42的过程中，在所述第二挡板22上还形成了开口部224。所述第二凸包42设有与所述第三后处理载体组件53的入口相连通的第三连接腔体421。
所述混合管组件6包括混合管61以及套接在所述混合管61上的扩展筒62。所述混合管61设有与所述第一连接腔体411相连通的若干旋流片611。请参照图9及图17所示，所述旋流片611悬空设置在所开口223中。所述混合管61穿过所述开口223。具体地，所述旋流片611凸出所述第二挡板22的第四侧面222以延伸入所述第一连接腔体411内，所述旋流片611凸出所述第二挡板22的第三侧面221以延伸入所述扩展筒62内。所述扩展筒62固定在所述第二挡板22的第三侧面221且密封在所述开口223的外围。所述扩展筒62设有扩展腔体621以及端壁622，所述扩展腔体621与所述开口223相连通；所述端壁622设有让所述混合管61穿过的穿孔6221，且所述混合管61固定在所述端壁622上。所述混合管61包括延伸入所述第二连接腔体412内的末端612，其中所述末端612与所述第一挡板21之间具有间隙613。如此设置，所述混合管组件6只需要一端焊接即可，避免了两端焊接时对同轴度的过高要求，提高了组装的便利性，降低了成本。换言之，当所述混合管组件6与所述第二挡板22焊接固定后，即使所述混合管61在所述第二连接腔体412内是倾斜的，也不会造成严重的影响。
请参照图11至图13所示，所述尾气后处理封装100还包括安装在所述混合管61上的安装盖63以及固定在所述安装盖63上的尿素喷嘴安装座64，其中所述安装盖63与所述末端612分别位于所述混合管61的两端。所述安装盖63设有位于中心的第一隆起部631以及位于所述第一隆起部631的外围的若干定位槽632，所述第一隆起部631设有安装孔6311。所述尿素喷嘴安装座64设有卡持在所述若干定位槽632中的若干定位脚642以及向所述第一隆起部631凸出的第二隆起部641。组装时，所述第二隆起部641插入所述安装孔6311 中且与所述安装盖63焊接固定。所述第二隆起部641设有用以安装尿素喷嘴的喷嘴孔6411。此外，在本发明图示的实施方式中，对所述尿素喷嘴安装座64的外周进行了优化设计，使其具有焊接让位部643，从而便于焊枪伸入以将所述安装盖63焊接固定到所述混合管61上。
请参照图14及图15所示，所述尾气后处理封装100包括贯穿所述第一挡板21与所述第二挡板22的筒体部23。所述筒体部23与所述第一挡板21以及所述第二挡板22焊接固定。所述第一壳体511与所述第二壳体521均收容在所述筒体部23内。所述筒体部23设有沿径向向外凸出的第一凸起部231(例如扩口或者翻边)。所述第二壳体521设有沿径向向外凸出的第二凸起部520。所述尾气后处理封装100还包括夹持在所述第一凸起部231与所述第二凸起部520之间的密封件523。在本发明的一种实施方式中，所述密封件523为套接在所述第二壳体521上的密封垫片。
所述尾气后处理封装100还包括与所述第二壳体521相固定的连接件524。请参照图4所示，在本发明的一种实施方式中，所述连接件524为位于所述第二壳体521的端面的端板525，所述端板525设有若干抵压面5251。在本发明图示的实施方式中，所述抵压面5251为三个且沿周向平均分布。
所述外壳体1设有用以拆卸所述第二后处理载体组件52的开口111。所述尾气后处理封装100包括用以与所述开口111相配合的端盖组件112以及用以拆卸所述端盖组件112的卡箍115。具体地，所述外壳体1设有位于所述开口111处的第一法兰1111。所述端盖组件112包括端盖1121、形成在所述端盖1121上的第二法兰1122、以及安装在所述端盖1121上的施力部件。所述尾气后处理封装100还包括夹持在所述第一法兰1111与所述第二法兰1122之间的第一密封垫片114，以实现更好的密封。所述施力部件穿过所述端盖1121，能够推动所述连接件524进而使所述第二壳体521紧密贴靠在所述密封件523上，以实现较好的密封。
所述施力部件为螺栓组件113。请参照图3所示，在本发明的一种实施方式中，所述螺栓组件113为三组，每一组均包括一个螺栓1131以及与所述螺栓 1131相配合的内螺纹。当旋转螺栓1131时，能够调节螺栓1131凸出所述端盖1121的长度；当螺栓1131凸出所述端盖1121的长度增加时，螺栓1131能够推动所述第二后处理载体组件52的第二壳体521发生移动，以实现更好的密封。在本发明图示的实施方式中，每一组螺栓组件113包括两个螺母，所述内螺纹形成在这两个螺母的内表面。其中一个螺母焊接固定在所述端盖1121上，另一个螺母靠近该螺母。所述螺栓1131穿过这两个螺母。通过设置两个螺母，能够防止螺栓1131发生松动，从而提高了其顶抵所述第二壳体521时的可靠性。
请参照图5、图8以及图10所示，所述第三壳体531设有与所述第二挡板22进行固定的若干凸起部5311以及位于相邻两个凸起部5311之间的气流通道5312。所述气流通道5312贯穿所述第二挡板22。具体地，所述第二连接腔体412与所述气流通道5312相连通，所述气流通道5312与开口部224相连通，开口部224与第三连接腔体421相连通，第三连接腔体421与所述第三后处理载体组件53的入口相连通。在本发明图示的实施方式中，所述若干凸起部5311焊接固定到所述第三侧面221。如此设置，避免了因第三壳体531穿过两个挡板而需要的同轴度要求，通过凸起部5311与第二挡板22进行焊接，降低了焊接要求，便于组装。另外，通过巧妙的设计气流通道5312，避免了增加零件数量，节省了成本。
所述支架组件7包括平行布置的第一支架71与第二支架72、连接所述第一支架71与所述第二支架72的第一连接部73与第二连接部74、以及连接在所述第一支架71与所述第二支架72上的两组绳索组件75。所述绳索组件75捆扎在所述外壳体1上。
使用时，首先，发动机的尾气自进气管31流入到尾气后处理封装100中；然后，尾气进入进气腔体431并流向第一后处理载体组件51的入口；然后，尾气穿过第一后处理载体组件51以及第二后处理载体组件52，进入到第一连接腔体411中；然后，尾气自旋流片611旋转进入到混合管61中；当满足喷射条件时，尿素喷嘴向所述混合管61中喷射雾化的尿素液滴，尿素液滴在尾气热量的作用下发生热解、水解产生氨气，并与尾气发生化学反应，以降低有害物质 的浓度；气流自混合管61的末端612进入到第二连接腔体412中；然后，气流穿过气流通道5312进入到第三连接腔体421，并穿过两组第三后处理载体组件53；然后，气流进入到出气腔体441中，并最终从出气管32离开。
以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，对本说明书的理解应该以所属技术领域的技术人员为基础，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (10)

  1. 一种尾气后处理封装，其包括外壳体、位于所述外壳体内且间隔布置的第一挡板与第二挡板、位于所述外壳体内的第二后处理载体组件、位于所述第二后处理载体组件的下游的第三后处理载体组件以及连通在所述第二后处理载体组件与所述第三后处理载体组件之间的混合管组件；所述第一挡板设有面向所述第二挡板的第一侧面以及与所述第一侧面相对的第二侧面，所述第二挡板设有面向所述第一挡板的第三侧面以及与所述第三侧面相对的第四侧面；所述第三后处理载体组件包括第三壳体以及封装在所述第三壳体内的第三催化剂载体，其特征在于：所述尾气后处理封装包括位于所述第二挡板的第四侧面的第一连接腔体以及位于所述第一挡板与所述第二挡板之间的第二连接腔体，所述第三壳体设有与所述第二挡板进行固定的若干凸起部以及位于相邻两个凸起部之间的气流通道，所述气流通道贯穿所述第二挡板，所述第一连接腔体与所述第二后处理载体组件相连通，所述第二连接腔体通过所述气流通道与所述第三后处理载体组件相连通。
  2. 如权利要求1所述的尾气后处理封装，其特征在于：所述第一挡板设有定位所述第三壳体的定位开孔，所述第二挡板设有开口部，所述若干凸起部焊接固定到所述第三侧面，所述气流通道与所述开口部相连通。
  3. 如权利要求2所述的尾气后处理封装，其特征在于：所述第一挡板设有冲压成型且凸出所述第四侧面的第二凸包，所述第二凸包形成了所述开口部，所述第二凸包设有与所述第三后处理载体组件的入口相连通的第三连接腔体。
  4. 如权利要求1所述的尾气后处理封装，其特征在于：所述混合管组件包括延伸入所述第二连接腔体内的末端，其中所述混合管组件与所述第二挡板相固定，所述末端与所述第一挡板之间具有间隙。
  5. 如权利要求4所述的尾气后处理封装，其特征在于：所述混合管组件包括混合管以及套接在所述混合管上的扩展筒，所述混合管设有与所述第一连接 腔体相连通的若干旋流片，所述第二挡板设有开口，所述旋流片悬空设置在所开口中，所述混合管穿过所述开口；其中所述旋流片凸出所述第二挡板的第四侧面以延伸入所述第一连接腔体内，所述旋流片凸出所述第二挡板的第三侧面以延伸入所述扩展筒内；所述扩展筒固定在所述第二挡板的第三侧面且密封在所述开口的外围。
  6. 如权利要求5所述的尾气后处理封装，其特征在于：所述扩展筒设有扩展腔体以及端壁，所述扩展腔体与所述开口相连通；所述端壁设有让所述混合管穿过的穿孔，且所述混合管固定在所述端壁上，所述末端位于所述混合管上。
  7. 如权利要求4所述的尾气后处理封装，其特征在于：所述第一挡板设有对应于所述末端的弧形凹陷部，所述弧形凹陷部自所述第一侧面向所述第二侧面凹陷。
  8. 如权利要求5所述的尾气后处理封装，其特征在于：所述尾气后处理封装包括安装在所述混合管上的安装盖以及固定在所述安装盖上的尿素喷嘴安装座，其中所述安装盖与所述末端分别位于所述混合管的两端；所述安装盖设有第一隆起部以及位于所述第一隆起部的外围的若干定位槽，所述第一隆起部设有安装孔；所述尿素喷嘴安装座设有卡持在所述若干定位槽中的若干定位脚以及向所述第一隆起部凸出的第二隆起部，所述第二隆起部插入所述安装孔中且与所述安装盖焊接固定，所述第二隆起部设有用以安装尿素喷嘴的喷嘴孔。
  9. 如权利要求1所述的尾气后处理封装，其特征在于：所述尾气后处理封装包括固定在所述第二挡板的第四侧面的第一凸包，所述第一连接腔体形成在所述第一凸包内。
  10. 如权利要求1所述的尾气后处理封装，其特征在于：所述第二后处理载体组件包括第二壳体以及封装在所述第二壳体内的柴油颗粒捕集器；所述尾气后处理封装包括套接在所述第二壳体的外围的筒体部，所述第二后处理载体组件可拆卸地安装在所述筒体部内。
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