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WO2018082381A1 - 箱体式尾气后处理装置 - Google Patents

箱体式尾气后处理装置 Download PDF

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Publication number
WO2018082381A1
WO2018082381A1 PCT/CN2017/099078 CN2017099078W WO2018082381A1 WO 2018082381 A1 WO2018082381 A1 WO 2018082381A1 CN 2017099078 W CN2017099078 W CN 2017099078W WO 2018082381 A1 WO2018082381 A1 WO 2018082381A1
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WO
WIPO (PCT)
Prior art keywords
baffle
catalyst carrier
circular hole
carrier assembly
assembly
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.)
Ceased
Application number
PCT/CN2017/099078
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English (en)
French (fr)
Inventor
张霞
张仕玉
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.)
Tenneco Suzhou Emission System Co Ltd
Original Assignee
Tenneco Suzhou Emission System Co Ltd
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 Tenneco Suzhou Emission System Co Ltd filed Critical Tenneco Suzhou Emission System Co Ltd
Publication of WO2018082381A1 publication Critical patent/WO2018082381A1/zh
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • 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
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • 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

Definitions

  • the invention relates to an engine exhaust aftertreatment device, in particular to a box type exhaust aftertreatment device.
  • Engine exhaust aftertreatment devices are primarily devices used to treat or purify toxic and hazardous materials in the exhaust.
  • the poisonous substances in the exhaust gas mainly include hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter.
  • a combination of an oxidation type catalytic converter (DOC), a particulate trap (DPF), and a selective catalytic reduction agent (SCR) system has been used in the prior art to improve the efficiency of exhaust gas treatment.
  • the oxidizing catalytic converter and the particulate trap are disposed in series within the first housing; the selective catalytic reducing agent is disposed within the second housing; and then the first 1.
  • the second housing is connected in series.
  • a technical solution using a mixing pipe or a static mixer is provided in the prior art.
  • the mixing tube is usually applied under the condition that the engine exhaust aftertreatment device can provide sufficient installation space.
  • the technical scheme of the static mixer is usually adopted.
  • a box type exhaust gas after-treatment device comprising a casing, a mixing assembly located in the casing, and a cylindrical catalyst carrier installed in the casing
  • An assembly having a first baffle and a second baffle that can be shared, the catalyst carrier assembly being carried between the first baffle and the second baffle, wherein the first block
  • the plate and the second baffle are both square, the first baffle is provided with a first diagonal line and a second diagonal line, and the first baffle is turned 180 degrees along the first diagonal line Same as the second baffle.
  • the catalyst carrier assembly includes a first catalyst carrier assembly, located at the a second catalyst carrier assembly that is linearly aligned with the first catalyst carrier assembly downstream of the first catalyst carrier assembly, and a third catalyst carrier assembly that is parallel to the first and second catalyst carrier assemblies;
  • the plate is provided with a first circular hole supporting the first catalyst carrier assembly, a second circular hole supporting the third catalyst carrier assembly, and a third circular hole supporting the mixing assembly, wherein the third circular hole The center falls on the first diagonal line, and the center of the first circular hole and the center of the second circular hole both fall on the second diagonal line.
  • the second baffle is provided with a fourth circular hole supporting the second catalyst carrier assembly, a fifth circular hole supporting the third catalyst carrier assembly, and supporting the mixing component a sixth circular hole
  • the second baffle is provided with a third diagonal line and a fourth diagonal line, wherein a center of the sixth circular hole falls on the third diagonal line, the fourth The center of the circular hole and the center of the fifth circular hole both fall on the fourth diagonal line.
  • the housing is provided with an exhaust inlet, an inlet cavity communicating with the exhaust inlet, a first connection cavity, a second connection cavity, an outlet cavity, and the outlet cavity a body-connected exhaust outlet;
  • the first catalyst carrier assembly is in communication with the inlet chamber, the first connection chamber communicating with the second catalyst carrier assembly and one end of the mixing tube assembly, the second connection A chamber communicates with the other end of the mixing tube assembly and is further in communication with one end of the third catalyst carrier assembly, the other end of the third catalyst carrier assembly being in communication with the outlet cavity.
  • the housing is provided with a first convex hull welded on the second baffle, and the first connecting cavity is formed in the first convex hull and the second dam Between the boards.
  • the housing is provided with a second convex hull welded on the first baffle, and the second connecting cavity is formed in the second convex hull and the first dam Between the boards.
  • the mixing assembly includes a sleeve portion welded to a periphery of the sixth circular hole, the sleeve portion is formed with an expansion cavity communicating with the first connection cavity; the mixing assembly Also included is a mixing tube that passes through the sleeve portion, the mixing tube being provided with a swirling vane at least partially located in the expansion chamber.
  • the mixing assembly includes a tapered tube welded to a periphery of the third circular hole, a small diameter of the tapered tube is welded to the mixing tube, and a large diameter of the tapered tube is The sleeve portion has the same diameter.
  • the first catalyst carrier assembly includes an oxidation type catalytic converter
  • the second catalyst carrier assembly includes a particle trap
  • the third catalyst carrier assembly includes a selective catalytic reducing agent
  • the present invention reduces the cost by sharing the first baffle with the second baffle.
  • Figure 1 is a perspective view of an engine exhaust aftertreatment device of the present invention.
  • Figure 2 is a perspective view of another angle of Figure 1.
  • Figure 3 is a partial exploded perspective view of Figure 1 with the first end cap and the second end cap separated.
  • Figure 4 is a front elevational view showing the first and second end caps of Figure 3 removed.
  • Figure 5 is a further exploded perspective view of Figure 4 with the second convex hull separated.
  • Figure 6 is an exploded perspective view of another angle of Figure 5.
  • Figure 7 is a front elevational view showing the second convex hull of Figure 5 removed.
  • Figure 8 is a further exploded perspective view of Figure 7 with the first baffle separated.
  • Figure 9 is a rear elevational view of the first baffle of Figure 8.
  • Figure 10 is a front elevational view of the first baffle of Figure 8.
  • Figure 11 is a further exploded perspective view of Figure 8 with the cone and mixing tube separated.
  • Figure 12 is a partial exploded perspective view of Figure 2 with the third end cap and the fourth end cap separated.
  • Figure 13 is a further exploded perspective view of the third and fourth end caps of Figure 12 with the first convex hull separated.
  • Figure 14 is an exploded perspective view of another angle of Figure 13;
  • Figure 15 is a front elevational view showing the first convex hull of Figure 13 removed.
  • Figure 16 is a front elevational view of the second baffle of Figure 13;
  • Figure 17 is a further exploded perspective view of the first convex hull of Figure 13 after removal.
  • Fig. 18 is a front view of Fig. 2;
  • Figure 19 is a cross-sectional view taken along line A-A of Figure 18.
  • Figure 20 is a cross-sectional view taken along line B-B of Figure 19.
  • the present invention discloses a box type exhaust gas after-treatment device 100 including a housing 1 , a mixing assembly 2 located in the housing 1 , and a housing 1 mounted thereon.
  • the catalyst carrier assembly 3 includes a cylindrical first catalyst carrier assembly 31, a cylindrical second catalyst carrier assembly 32, and a cylindrical third catalyst carrier assembly 33.
  • the second catalyst carrier assembly 32 is located downstream of the first catalyst carrier assembly 31 and is linearly aligned with the first catalyst carrier assembly 31, the third catalyst carrier assembly 33 Parallel to the first and second catalyst carrier assemblies 31,32.
  • the first catalyst carrier assembly 31 includes an oxidized type Converter (DOC), the second catalyst carrier assembly 32 includes a particulate trap (DPF), and the third catalyst carrier assembly 33 (SCR) includes a selective catalytic reduction agent (SCR).
  • DOC oxidized type Converter
  • DPF particulate trap
  • SCR selective catalytic reduction agent
  • the housing 1 is respectively provided with a first end cover 11 and a second end cover 12, and a third end cover 13 and a fourth end cover 14 at two ends thereof, wherein the first end The cover 11 and the second end cover 12 form a double end cover, and an exhaust inlet 111 is connected thereto; the third end cover 13 and the fourth end cover 14 form a double end cover, and the exhaust is connected thereto Exit 131.
  • the housing 1 is further provided with an inlet cavity 112 communicating with the exhaust inlet 111 and an outlet cavity 132 communicating with the exhaust outlet 131.
  • the housing 1 is provided with a first baffle 15 and a second baffle 16 that can be shared by the components, a first convex hull 17 welded to the second baffle 16 , and A second convex hull 18 is welded to the first baffle 15.
  • the first baffle 15 and the second baffle 16 are both square and identical in structure.
  • the "square" here should be understood to include the case of chamfering.
  • the first baffle 15 is provided with a first diagonal 156 and a second diagonal 157 .
  • the first baffle 15 further includes a first circular hole 151 supporting the first catalyst carrier assembly 31, a second circular hole 152 supporting the third catalyst carrier assembly 32, and a third supporting the mixing assembly 2 a circular hole 153, wherein a center 1531 of the third circular hole 153 falls on the first diagonal 156, and a center 1511 of the first circular hole 151 and a center 1521 of the second circular hole 152 both fall On the second diagonal 157.
  • the first circular hole 151 and the second circular hole 152 are symmetrically arranged along the first diagonal 156.
  • the second baffle 16 is provided with a third diagonal 166 and a fourth diagonal 167.
  • the second baffle 16 further includes a fourth circular hole 161 supporting the second catalyst carrier assembly 32, a fifth circular hole 162 supporting the third catalyst carrier assembly 33, and a sixth supporting the mixing assembly 2 a circular hole 163, wherein a center 1631 of the sixth circular hole 163 falls on the third diagonal 166, and a center 1611 of the fourth circular hole 161 and a center 1621 of the fifth circular hole 162 both fall On the fourth diagonal 167.
  • the fourth circular hole 161 and the fifth circular hole 162 are symmetrically arranged along the third diagonal 166. In this way, the first baffle 15 and the second baffle 16 can share the same part number to save cost. Referring to FIG. 9 and FIG. 16, the first baffle 15 can be used as the second baffle 16 by rotating it 180 degrees along its first diagonal 156.
  • a first connection cavity 171 is formed between the first convex package 17 and the second baffle 16, and the first connection cavity 171 defines the fourth circular hole 161. It is connected to the sixth circular hole 163.
  • a second connecting cavity 181 is formed between the second convex hull 18 and the first baffle 15 .
  • the second connecting cavity 181 connects the third circular hole 153 with the second circular hole 152.
  • the exhaust communication path of the present invention is as follows: the first catalyst carrier assembly 31 is in communication with the inlet chamber 112, and the first connection chamber 171 is in communication with the second catalyst carrier assembly 32 and one end of the mixing assembly 2 (near one end of the urea nozzle), the second connection chamber 181 communicates with the other end of the mixing assembly 2 (one end away from the urea nozzle) and further communicates with one end of the third catalyst carrier assembly 33, The other end of the three catalyst carrier assembly 33 communicates with the outlet body 132.
  • the mixing assembly 2 includes a sleeve portion 21 welded to the periphery of the sixth circular hole 163, a mixing tube 22 passing through the sleeve portion 21, and welded to the first portion.
  • the sleeve portion 21 is formed to communicate with the first connection chamber 171 with an expansion chamber 211, and the mixing tube 22 is provided with a swirling sheet 221 at least partially located in the expansion chamber 211.
  • the swirl fins 221 are arranged at an angle such that the exhaust gas can form a good eddy current in the mixing tube 22 to improve the mixing uniformity of the urea and the exhaust gas.
  • the small diameter 231 of the tapered tube 23 is welded to the mixing tube 22, and the large diameter 232 of the tapered tube 23 is the same as the diameter of the sleeve portion 21.
  • exhaust from the engine first enters from the exhaust inlet 111 and then enters the inlet cavity 112; the exhaust then passes through the first catalyst carrier assembly 31 and the second catalyst carrier assembly 32 into the first connection chamber. 171; under the action of the exhaust pressure, the exhaust gas enters the mixing tube 22 under the guidance of the swirling sheet 221; when the spraying condition is reached, the urea nozzle (not shown) sprays the atomized urea solution into the chamber In the mixing tube 22; after mixing with the urea droplets and the exhaust gas, it reaches the second connecting chamber 181 along the cone tube 23, wherein the cone tube 23 can function to reduce the back pressure; then, the air stream passes through the third catalyst carrier assembly. 33 enters the exiting body 132 and eventually exits the exhaust outlet 131.
  • the present invention reduces the cost by sharing the first baffle 15 and the second baffle 16.

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

Abstract

一种箱体式尾气后处理装置（100），其包括壳体（1）、位于所述壳体（1）内的混合组件（2）以及安装于所述壳体（1）内且呈圆筒状的催化剂载体组件（3），所述壳体（1）设有可以共用的第一挡板（15）与第二挡板（16），所述催化剂载体组件（3）承载在所述第一挡板（15）与所述第二挡板（16）之间，其中所述第一挡板（15）与所述第二挡板（16）均呈正方形，所述第一挡板（15）设有第一对角线（156）以及第二对角线（157），所述第一挡板（15）沿所述第一对角线（156）翻转180度后与所述第二挡板（16）相同。如此设置，能够实现挡板共用以节省成本。

Description

箱体式尾气后处理装置
本申请要求了申请日为2016年11月4日、申请号为201610960776.7、发明名称为“箱体式尾气后处理装置”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
本发明涉及一种发动机尾气后处理装置，尤其涉及一种箱体式尾气后处理装置。
背景技术
发动机尾气后处理装置(例如柴油机尾气后处理装置)主要是用来处理或净化排气中有毒及有害物质的装置。排气中的毒害物质主要包含碳氢化合物、一氧化碳、氮氧化物及颗粒物等。
现有技术中已经有采用氧化型催化转换器(DOC)、颗粒捕集器(DPF)以及选择性催化还原剂(SCR)系统相组合的方案来提高排气处理的效能。在一种方案中，所述氧化型催化转换器与颗粒捕集器被串联设置在第一壳体内；所述选择性催化还原剂被设置在第二壳体内；然后借助连接管道将所述第一、第二壳体串联起来。
为了使排气能够在所述连接管道内与雾化后的尿素溶液进行均匀混合，现有技术中提供了利用混合管或者静态混合器的技术方案。其中，混合管通常应用在发动机尾气后处理装置能够提供足够安装空间的条件下。而当安装空间不够时，则通常采用静态混合器的技术方案。
然而，随着客户对安装条件多样性的要求，如何设计出一种箱体式尾气后处理装置既能够共用零件以节省成本是本领域需要解决的技术难题。
发明内容
本发明的目的在于提供一种挡板能够共用的箱体式尾气后处理装置。
为实现上述目的，本发明采用如下技术方案：一种箱体式尾气后处理装置，其包括壳体、位于所述壳体内的混合组件以及安装于所述壳体内且呈圆筒状的催化剂载体组件，所述壳体设有可以共用的第一挡板与第二挡板，所述催化剂载体组件承载在所述第一挡板与所述第二挡板之间，其中所述第一挡板与所述第二挡板均呈正方形，所述第一挡板设有第一对角线以及第二对角线，所述第一挡板沿所述第一对角线翻转180度后与所述第二挡板相同。
作为本发明进一步改进的技术方案，所述催化剂载体组件包括第一催化剂载体组件、位于所述 第一催化剂载体组件的下游其与所述第一催化剂载体组件直线对齐的第二催化剂载体组件、以及平行于所述第一、第二催化剂载体组件的第三催化剂载体组件；所述第一挡板设有支撑所述第一催化剂载体组件的第一圆孔、支撑所述第三催化剂载体组件的第二圆孔以及支撑所述混合组件的第三圆孔，其中所述第三圆孔的中心落在所述第一对角线上，所述第一圆孔的中心与所述第二圆孔的中心均落在所述第二对角线上。
作为本发明进一步改进的技术方案，所述第二挡板设有支撑所述第二催化剂载体组件的第四圆孔、支撑所述第三催化剂载体组件的第五圆孔以及支撑所述混合组件的第六圆孔，所述第二挡板设有第三对角线以及第四对角线，其中所述第六圆孔的中心落在所述第三对角线上，所述第四圆孔的中心与所述第五圆孔的中心均落在所述第四对角线上。
作为本发明进一步改进的技术方案，所述壳体设有排气入口、与所述排气入口连通的入口腔体、第一连接腔、第二连接腔、出口腔体以及与所述出口腔体连通的排气出口；所述第一催化剂载体组件与所述入口腔体连通，所述第一连接腔连通所述第二催化剂载体组件与所述混合管组件的一端，所述第二连接腔连通所述混合管组件的另一端并进一步与所述第三催化剂载体组件的一端相连通，所述第三催化剂载体组件的另一端连通所述出口腔体。
作为本发明进一步改进的技术方案，所述壳体设有焊接在所述第二挡板上的第一凸包，所述第一连接腔形成在所述第一凸包与所述第二挡板之间。
作为本发明进一步改进的技术方案，所述壳体设有焊接在所述第一挡板上的第二凸包，所述第二连接腔形成在所述第二凸包与所述第一挡板之间。
作为本发明进一步改进的技术方案，所述混合组件包括焊接在所述第六圆孔外围的套筒部，所述套筒部形成有与所述第一连接腔连通扩展腔；所述混合组件还包括穿过所述套筒部的混合管，所述混合管设有至少部分位于所述扩展腔中的旋流片。
作为本发明进一步改进的技术方案，所述混合组件包括焊接在所述第三圆孔外围的锥管，所述锥管的小径与所述混合管焊接，所述锥管的大径与所述套筒部的直径相同。
作为本发明进一步改进的技术方案，所述第一催化剂载体组件包括氧化型催化转换器，所述第二催化剂载体组件包括颗粒捕集器，所述第三催化剂载体组件包括选择性催化还原剂。
相较于现有技术，本发明通过将第一挡板与第二挡板实现共用，降低了成本。
附图说明
图1是本发明发动机尾气后处理装置的立体示意图。
图2是图1另一角度的立体示意图。
图3是图1的部分立体分解图，其中第一端盖与第二端盖被分离出来。
图4是去除图3中第一、第二端盖后的主视图。
图5是图4的进一步的立体分解图，其中第二凸包被分离出来。
图6是图5另一角度的立体分解图。
图7是去除图5中第二凸包后的主视图。
图8是图7的进一步的立体分解图，其中第一挡板被分离出来。
图9是图8中第一挡板的后视图。
图10是图8中第一挡板的主视图。
图11是图8的进一步的立体分解图，其中锥管以及混合管被分离出来。
图12是图2的部分立体分解图，其中第三端盖与第四端盖被分离出来。
图13是去除图12中的第三、第四端盖之后进一步的立体分解图，其中第一凸包被分离出来。
图14是图13另一角度的立体分解图。
图15是去除图13中第一凸包后的主视图。
图16是图13中第二挡板的主视图。
图17是去除图13中第一凸包之后进一步的立体分解图。
图18是图2的主侧图。
图19是沿图18中A-A线的剖视图。
图20是沿图19中B-B线的剖视图。
具体实施方式
请参图1至图20所示，本发明揭示了一种箱体式尾气后处理装置100，其包括壳体1、位于所述壳体1内的混合组件2以及安装于所述壳体1内的催化剂载体组件3。其中，所述催化剂载体组件3包括圆筒状的第一催化剂载体组件31、圆筒状的第二催化剂载体组件32以及圆筒状的第三催化剂载体组件33。在本发明图示的实施方式中，所述第二催化剂载体组件32位于所述第一催化剂载体组件31的下游且与所述第一催化剂载体组件31直线对齐，所述第三催化剂载体组件33平行于所述第一、第二催化剂载体组件31、32。所述第一催化剂载体组件31包括氧化型催 化转换器(DOC)，所述第二催化剂载体组件32包括颗粒捕集器(DPF)，所述第三催化剂载体组件33(SCR)包括选择性催化还原剂(SCR)。上述催化剂载体组件的功能对本领域技术人员是熟知的，在此不再赘述。
请参图3及图12所示，所述壳体1在其两端分别设有第一端盖11与第二端盖12以及第三端盖13与第四端盖14，其中第一端盖11与第二端盖12构成双层端盖，并在其上连接有排气入口111；第三端盖13与第四端盖14构成双层端盖，并在其上连接有排气出口131。另外，所述壳体1还设有与所述排气入口111连通的入口腔体112以及与排气出口131连通的出口腔体132。
请参图5至图16所示，所述壳体1设有零件能够共用的第一挡板15与第二挡板16、焊接在所述第二挡板16上的第一凸包17以及焊接在所述第一挡板15上的第二凸包18。在本发明图示的实施方式中，所述第一挡板15与所述第二挡板16均呈正方形且结构相同。当然，这里的“正方形”应理解为包括倒角的情况。
请参图5至图12所示，所述第一挡板15设有第一对角线156以及第二对角线157。所述第一挡板15还包括支撑所述第一催化剂载体组件31的第一圆孔151、支撑所述第三催化剂载体组件32的第二圆孔152以及支撑所述混合组件2的第三圆孔153，其中所述第三圆孔153的中心1531落在所述第一对角线156上，所述第一圆孔151的中心1511以及所述第二圆孔152的中心1521均落在所述第二对角线157上。所述第一圆孔151与所述第二圆孔152沿所述第一对角线156对称布置。
请参图16所示，所述第二挡板16设有第三对角线166以及第四对角线167。所述第二挡板16还包括支撑所述第二催化剂载体组件32的第四圆孔161、支撑所述第三催化剂载体组件33的第五圆孔162以及支撑所述混合组件2的第六圆孔163，其中所述第六圆孔163的中心1631落在所述第三对角线166上，所述第四圆孔161的中心1611以及所述第五圆孔162的中心1621均落在所述第四对角线167上。所述第四圆孔161与所述第五圆孔162沿所述第三对角线166对称布置。如此设置，所述第一挡板15与所述第二挡板16可以共用同一个零件号以节省成本。请参图9及图16所示，只要将第一挡板15沿其第一对角线156旋转180度即可作为第二挡板16使用。
请参图14及图20所示，所述第一凸包17与所述第二挡板16之间形成了第一连接腔171，所述第一连接腔171将所述第四圆孔161与所述第六圆孔163连通起来。
请参图3至图5所示，所述第二凸包18与所述第一挡板15之间形成了第二连接腔181，所 述第二连接腔181将所述第三圆孔153与所述第二圆孔152连通起来。
本发明的排气连通路径如下：所述第一催化剂载体组件31与所述入口腔体112连通，所述第一连接腔171连通所述第二催化剂载体组件32与所述混合组件2的一端(靠近尿素喷嘴的一端)，所述第二连接腔181连通所述混合组件2的另一端(远离尿素喷嘴的一端)并进一步与所述第三催化剂载体组件33的一端相连通，所述第三催化剂载体组件33的另一端连通所述出口腔体132。
请参图11至图20所示，所述混合组件2包括焊接在所述第六圆孔163外围的套筒部21、穿过所述套筒部21的混合管22以及焊接在所述第三圆孔153外围的锥管23。所述套筒部21形成有与所述第一连接腔171连通扩展腔211，所述混合管22设有至少部分位于所述扩展腔211中的旋流片221。所述旋流片221沿一定的角度排列，从而使排气能够在混合管22内形成良好的涡流，以提高尿素与排气的混合均匀性。所述锥管23的小径231与所述混合管22焊接，所述锥管23的大径232与所述套筒部21的直径相同。
使用时，从发动机出来的排气首先自排气入口111进入，然后进入到入口腔体112中；随后排气穿过第一催化剂载体组件31以及第二催化剂载体组件32进入到第一连接腔171中；在排气压力的作用下，排气会在旋流片221的导引下进入混合管22；达到喷射条件时，尿素喷嘴(未图示)会将雾化的尿素溶液喷入所述混合管22中；与尿素液滴与排气混合之后沿着锥管23到达第二连接腔181，其中锥管23能够起到降低背压的作用；随后，气流再经过第三催化剂载体组件33进入到出口腔体132，最终从排气出口131离开。
相较于现有技术，本发明通过将第一挡板15与第二挡板16实现共用，降低了成本。
另外，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 (9)

  1. 一种箱体式尾气后处理装置，其包括壳体、位于所述壳体内的混合组件以及安装于所述壳体内且呈圆筒状的催化剂载体组件，其特征在于：所述壳体设有可以共用的第一挡板与第二挡板，所述催化剂载体组件承载在所述第一挡板与所述第二挡板之间，其中所述第一挡板与所述第二挡板均呈正方形，所述第一挡板设有第一对角线以及第二对角线，所述第一挡板沿所述第一对角线翻转180度后与所述第二挡板相同。
  2. 如权利要求1所述的箱体式尾气后处理装置，其特征在于：所述催化剂载体组件包括第一催化剂载体组件、位于所述第一催化剂载体组件的下游其与所述第一催化剂载体组件直线对齐的第二催化剂载体组件、以及平行于所述第一、第二催化剂载体组件的第三催化剂载体组件；所述第一挡板设有支撑所述第一催化剂载体组件的第一圆孔、支撑所述第三催化剂载体组件的第二圆孔以及支撑所述混合组件的第三圆孔，其中所述第三圆孔的中心落在所述第一对角线上，所述第一圆孔的中心与所述第二圆孔的中心均落在所述第二对角线上。
  3. 如权利要求2所述的箱体式尾气后处理装置，其特征在于：所述第二挡板设有支撑所述第二催化剂载体组件的第四圆孔、支撑所述第三催化剂载体组件的第五圆孔以及支撑所述混合组件的第六圆孔，所述第二挡板设有第三对角线以及第四对角线，其中所述第六圆孔的中心落在所述第三对角线上，所述第四圆孔的中心与所述第五圆孔的中心均落在所述第四对角线上。
  4. 如权利要求3所述的箱体式尾气后处理装置，其特征在于：所述壳体设有排气入口、与所述排气入口连通的入口腔体、第一连接腔、第二连接腔、出口腔体以及与所述出口腔体连通的排气出口；所述第一催化剂载体组件与所述入口腔体连通，所述第一连接腔连通所述第二催化剂载体组件与所述混合管组件的一端，所述第二连接腔连通所述混合管组件的另一端并进一步与所述第三催化剂载体组件的一端相连通，所述第三催化剂载体组件的另一端连通所述出口腔体。
  5. 如权利要求4所述的箱体式尾气后处理装置，其特征在于：所述壳体设有焊接在所述第二挡板上的第一凸包，所述第一连接腔形成在所述第一凸包与所述第二挡板之间。
  6. 如权利要求5所述的箱体式尾气后处理装置，其特征在于：所述壳体设有焊接在所述第一 挡板上的第二凸包，所述第二连接腔形成在所述第二凸包与所述第一挡板之间。
  7. 如权利要求6所述的箱体式尾气后处理装置，其特征在于：所述混合组件包括焊接在所述第六圆孔外围的套筒部，所述套筒部形成有与所述第一连接腔连通扩展腔；所述混合组件还包括穿过所述套筒部的混合管，所述混合管设有至少部分位于所述扩展腔中的旋流片。
  8. 如权利要求7所述的箱体式尾气后处理装置，其特征在于：所述混合组件包括焊接在所述第三圆孔外围的锥管，所述锥管的小径与所述混合管焊接，所述锥管的大径与所述套筒部的直径相同。
  9. 如权利要求2所述的箱体式尾气后处理装置，其特征在于：所述第一催化剂载体组件包括氧化型催化转换器，所述第二催化剂载体组件包括颗粒捕集器，所述第三催化剂载体组件包括选择性催化还原剂。
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