CN101802356B - 排气净化装置 - Google Patents

排气净化装置 Download PDF

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CN101802356B
CN101802356B CN200880107851.9A CN200880107851A CN101802356B CN 101802356 B CN101802356 B CN 101802356B CN 200880107851 A CN200880107851 A CN 200880107851A CN 101802356 B CN101802356 B CN 101802356B
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exhaust
collection chamber
gas collection
assembly department
shell
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CN101802356A (zh
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远藤浩史
高桥则行
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Hino Motors Ltd
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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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • 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
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/1855—Mechanical joints the connection being realised by using bolts, screws, rivets or the like
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    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
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    • 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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/406—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24—Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/22—Inlet and outlet tubes being positioned on the same side of the apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • 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
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

涉及一种排气净化装置，在排气管(4)的中途作为NOx降低催化剂而具有选择还原型催化剂(5)，该选择还原型催化剂(5)具有即使在共存有氧的环境下也能够使NOx与氨选择地反应的特性，并且在其上流具有颗粒过滤器(13)，在上述颗粒过滤器(13)的前段设置喷射适量的燃料而使其着火燃烧的燃烧器(14)，并且在上述颗粒过滤器(13)与上述选择还原型催化剂(5)之间夹装氧化处理排气(3)中的未燃H C且促进排气(3)中的NO的向NO2的氧化反应的氧化催化剂(15)。

Description

排气净化装置
技术领域
本发明涉及一种排气净化装置。
背景技术
近年，提出了一种排气净化装置：在排气管的中途具有收集排气中的颗粒的颗粒过滤器，并且在该颗粒过滤器的下游侧具有即使在共存有氧的情况下也能够选择地使NOx与氨反应的选择还原型催化剂，作为还原剂将尿素水添加至该选择还原型催化剂与上述颗粒过滤器之间，实现颗粒与NOx的同时降低。
在这样的情况下，向选择还原型催化剂的尿素水的添加在颗粒过滤器与选择还原型催化剂之间进行，因此，如果要确保添加至排气中的尿素水被热分解为氨和碳酸气体所需的充分的反应时间，则必须延长从尿素水的添加位置到选择还原型催化剂的距离，但是若使颗粒过滤器与选择还原型催化剂隔着充分的距离而分离配置，则存在向车辆的装载性显著受损的不良情况。
于是，本发明者发明了如图1及图2所示的紧凑的排气净化装置，已经将其作为日本特愿2007-29923而提出，在该申请中的排气净化装置中，在从柴油发动机1经由排气岐管2排出的排气3所流通的排气管4的中途，分别被壳7、8抱持地并列配置有颗粒过滤器5和选择还原型催化剂6，所述颗粒过滤器5收集排气3中的颗粒，所述选择还原型催化剂6具有即使在该颗粒过滤器5的下游侧共存有氧的情况下也能够选择地使NOx与氨反应的特性，并且借助S字构造的联络流路9将颗粒过滤器5的后端部与选择还原型催化剂6的前端部之间连接，令从颗粒过滤器5的后端部排出的排气3向前方折回而被导入至相邻的选择还原型催化剂6的前端部。
图2是将重要部分放大表示的图，如图2所示，上述联络流路9以形成S字构造的方式由气体集合室9A、混合管9B、气体分散室9C构成，所述气体集合室9A为，包围颗粒过滤器5的后端部且使刚刚从该后端部出来的排气3撞到壁面而使其的方向向大致直角的方向转变并使其集合，所述混合管9B为，将由该气体集合室9A聚集的排气3向前方抽出且在其中途具有尿素水添加用喷射器10(尿素水添加机构)，所述气体分散室9C为，使被该混合管9B导向前方的排气3撞到壁面而使其方向向大致直角的方向转变并使其分散、且包围选择还原型催化剂6的前端部以便能够将该被分散的排气3导入至该前端部。
另外，在抱持颗粒过滤器5的壳7内的前段配备氧化处理排气3中的未燃燃料部分的氧化催化剂11，此外，在抱持选择还原型催化剂6的壳8内的后段配备氧化处理剩余的氨的氨降低催化剂12。
于是，若采用这样的构成，则借助颗粒过滤器5收集排气3中的颗粒，并且在其下游侧的混合管9B的中途将尿素水从尿素水添加用喷射器10添加至排气3中而热分解为氨和碳酸气体，排气3中的NOx在选择还原型催化剂6上被氨良好地还原净化，其结果，能够实现排气3中的颗粒和NOx的同时降低。
此时，从颗粒过滤器5的后端部排出的排气3借助联络流路9而向前方折回，之后被导入至相邻的选择还原型催化剂6的前端部，因此，能够更长地确保从位于上述联络流路9的中途的尿素水的添加位置到选择还原型催化剂6的距离，通过排气3的流动折回而进行紊流化而实现尿素水与排气3的混合促进，其结果，确保用于从尿素水生成氨的充分的反应时间。
而且，并列地配置颗粒过滤器5和选择还原型催化剂6，且以沿着这些颗粒过滤器5与选择还原型催化剂6之间的方式配置联络流路9，因此其整体构成紧凑化而向车辆的装载性大幅提升。
另外，作为与本发明相关的现有技术文献信息，例如已经有下述的专利文献1等。
【专利文献1】日本特开2005-155404号公报
但是，气体集合室9A，为了使排气3的方向向大致直角的方向转变而向与壳7的轴心方向不同的方向形成排气通路，因此在借助连接凸缘将气体集合室9A与壳7连接时，排气通路相对于连接凸缘的紧固部分而言成为障碍，存在不能够在周方向上将连接凸缘全部紧固的问题。此外，在气体集合室9A内，在使排气流下时产生紊流，因此存在不能够使排气向混合管适当地流下的问题。进而，期望提高气体集合室9A等的刚性。
发明内容
本发明是鉴于上述的情况而提出的，其目的在于提供一种排气净化装置，可靠地紧固连接气体集合室的连接凸缘，并且使气体集合室内的排气适当地流下，进而提高气体集合室等的刚性。
本发明是一种排气净化装置，在排气通路中途的壳内配备有使排气通过而进行净化的后处理装置，在该壳的出口侧借助连接凸缘连接向与该壳的轴心方向不同的朝向形成有排气通路的气体集合室，其特征为，在上述气体集合室上具有贯通排气通路的安装部而形成能够从外部对连接凸缘进行紧固的安装孔，并且在构成上述安装孔的安装部的外周具有将排气整流的曲面。
若如此，由于在气体集合室上具有能够从外部对连接凸缘进行紧固的安装孔，因此，在借助连接凸缘连接气体集合室时，排气通路相对于连接凸缘的紧固部分而言不成为障碍，能够可靠地紧固连接凸缘。此外，在构成安装孔的安装部的外周具有将排气整流的曲面，因此，在气体集合室内的排气通路中使排气流下时，能够抑制从周围面的剥离现象而降低紊流，且能够使排气向下游侧适当地流下。进而，借助构成安装孔的安装部支承气体集合室的面，因此能够提高气体集合室等的刚性。
此外，在本发明中，优选在气体集合室的出口侧连接向与排气通路的流路方向不同的朝向形成有第二排气通路的联络体，在上述气体集合室上配置从构成安装孔的安装部向上述联络体的入口延伸的整流部材，若如此，则能够进一步抑制从安装部的剥离现象而令紊流大幅地降低，能够使排气向下游侧适当地流下。此外，借助整流部材支承气体集合室的面，因此能够提高气体集合室的刚性。进而，在安装部上具有整流部材，因此能够提高整流部材的刚性。
此外，在本发明中，优选排气通路借助安装部及整流部材被划分为将排气整流并使其流下的流路空间、和使排气滞留的滞留空间，若如此，则借助流路空间形成排气的排气流路，并且借助滞留空间产生保温效果，因此能够使排气向下游侧适当地流下。
根据上述的本发明的排气净化装置，能够获得以下种种优点：在借助连接凸缘连接气体集合室时，排气通路相对于连接凸缘的紧固部分而言不成为障碍，能够可靠地紧固连接凸缘，并且能够使气体集合室内的排气适当地流下，进而能够提高气体集合室及整流部材的刚性。
附图说明
图1是表示以往例的概略图。
图2是将图1的重要部分放大表示的立体图。
图3是表示本发明的一实施例的概念图。
图4是表示本发明的一实施例主视图。
图5是表示本发明的一实施例的截面的主视图。
附图标记说明
5 颗粒过滤器(后处理装置)
7 壳
9A 气体集合室
9B 混合管(联络体)
13 第一排气通路
13A 流路空间
13B 滞留空间
14 第二排气通路
21 连接凸缘
22 连接凸缘
25 安装孔
26 安装部
26a 曲面
28 入口
29 第一整流部材
具体实施方式
以下参照附图说明本发明的实施方式。
图3～图5表示实施本发明的方式的一例，在本实施例中，涉及一种与上述的图1及图2的排气净化装置大致相同地构成的排气净化装置，在配置了颗粒过滤器5(后处理装置)的壳7内的出口侧连接有沿着与壳7的轴心方向为大致直角的方向(不同的方向)形成有第一排气通路13的气体集合室9A。此外，在气体集合室9A的出口侧以与壳7的轴心方向大致平行的方式连接有向与第一排气通路13的流路方向为大致直角的方向(不同的方向)形成有第二排气通路14的混合管9B(联络体)。
气体集合室9A具有：与壳7的径相对应而形成在入口侧的入侧的内部空间15、与混合管9B(联络体)的径相对应而形成在出口侧的出侧的内部空间16、连接入侧的内部空间15和出侧的内部空间16的中间的内部空间17，这些内部空间15、16、17由以下部件形成：面向外方而形成的平面状的正面板18、包围正面板18的周围的侧面板19、以形成中间的内部空间17的方式与侧面板19连接的平面状的里面板20。
在气体集合室9A的入口侧以与形成于壳7的出口侧的连接凸缘21相对应的方式具有气体集合室9A侧的连接凸缘22。对于气体集合室9A的连接凸缘22和壳7的连接凸缘21，沿周方向的缘部23以既定的间隔形成孔24，并且在孔24上配置螺栓及螺母等的紧固部件(未图示)而能够将连接凸缘22、21相互紧固。在此，在气体集合室9A的连接凸缘22与壳7的连接凸缘21之间，也可以配置衬垫及板，此外，气体集合室9A和壳7的连接构造也可以是只在某一方上形成连接凸缘而能够连接另一方的其他的构造。
此外，在气体集合室9A上，对于覆盖连接凸缘22的孔24的一部分(在图3～图5中为1个)的正面板18及里面板20，具有从气体集合室9A的外部朝向连接凸缘22的紧固位置的安装孔25。安装孔25由贯通第一排气通路13的筒状的安装部26构成，为了提高气体集合室9A的刚性，将上端焊接固定在正面板18上并且将下端焊接固定在里面板20上。此外，在构成安装孔25的安装部26的外周面上，形成圆弧及翼状的曲面26a以在使排气流下时不发生排气的流体的剥离。在此，安装孔25的直径，只要能够插通螺栓及螺母等的紧固部件(未图示)而向连接凸缘22的孔24进行配置就不被特别地限定，但是优选具备能够插入冲击扳手等的工具(未图示)的套筒(未图示)而固定紧固部件的大小。
另一方面，在气体集合室9A的出口侧配置由混合管9B(联络体)的顶端形成的入口侧的筒体27，混合管9B(联络体)的入口侧的筒体27通过切去侧面的一部分而形成从气体集合室9A通向混合管9B(联络体)的入口28。
此外，在气体集合室9A中，配置从构成安装孔25的安装部26向混合管9B(联络体)的入口28的一侧边延伸的第一整流部材29，并且配置从形成气体集合室9A的侧面板19的内表面向混合管9B(联络体)的入口28的另一侧边延伸的第二整流部材30。在此，第一整流部材29借助焊接而被固定在安装部26的外周面上，并且被配置为经由座面29a而被固定在气体集合室9A的里面板20上，进而向混合管9B(联络体)的入口28的一侧边插入。
进而，气体集合室9A的第一排气通路13借助安装部26及第一整流部材29被划分为将排气整流而使其流下的流路空间13A、和使排气滞留的滞留空间13B。此外，在滞留空间13B上配置分隔部件31，该分隔部件31从侧面板19的内表面向筒体27延伸，从而防止排气转入至筒体27的后方。
以下说明本发明的实施例的作用。
在将气体集合室9A组装在壳7上时，使用冲击扳手等的工具，利用螺栓及螺母等的紧固部件将气体集合室9A的连接凸缘22与壳7的连接凸缘21紧固。此时，在由于第一排气通路13的配置而令连接凸缘22的孔24的一部分被覆盖的位置，经由安装孔25而借助冲击扳手等的工具将螺栓及螺母等的紧固部件固定。
进而，在使排气向气体集合室9A流下时，使从壳7流入的排气经由入侧的内部空间15、中间的内部空间17、出侧的内部空间16而向混合管9B(联络体)流下。此时，排气在流路空间13A内被安装部26的外周面、第一整流部材29及第二整流部材30整流，以便不产生由排气的流体的剥离导致的紊流，并且令排气向混合管9B(联络体)的入口28流下，同时令排气的一部分滞留在滞留空间13B中，产生保温效果。
从而，根据上述实施例，在气体集合室9A上借助贯通排气通路13的安装部26而配备有安装孔25，因此在借助连接凸缘22连接气体集合室9A时，排气通路13对于连接凸缘22的连接部分而言不成为障碍，能够利用全部的孔24沿周方向将连接凸缘22的缘部23可靠地紧固。此外，在构成安装孔25的安装部26上具有整流排气的曲面26a，因此在利用第一排气通路13使排气流下时，能够抑制自安装部26的外周面等的剥离现象而降低紊流，且能够使排气向下游侧适当地流下。进而，因为借助构成安装孔25的安装部26支承气体集合室9A的正面板18及里面板20，所以能够提高气体集合室9A及第一整流部材29的刚性。
若在气体集合室9A的出口侧连接沿与排气通路13的流路方向不同的朝向形成有第二排气通路14的混合管9B(联络体)，且在气体集合室9A中配置从构成安装孔25的安装部26向混合管9B(联络体)的入口28延伸的第一整流部材29，则能够进一步抑制自安装部26的剥离现象而大幅地降低紊流，能够使排气向下游侧适当地流下。此外，因为借助第一整流部材29及第二整流部材30支承气体集合室9A的正面板18及里面板20，所以能够提高气体集合室9A的刚性。进而因为将第一整流部材29固定在安装孔25等上，所以能够提高第一整流部材29的刚性。
排气通路13借助安装部26及第一整流部材29而被划分为将排气整流而使其流下的流路空间13A、和使排气滞留的滞留空间13B，则借助流路空间13A形成排气的排气流路，并且借助滞留空间13B产生保温效果，因此能够使排气向下游侧适当地流下。
另外，本发明的排气净化装置并不仅仅限定于上述的实施例，在上述的实施例中，第一排气通路，只要是向与壳的轴心方向不同的朝向形成则不限定于大致直角的方向，第二排气通路只要是向与第一排气流路不同的朝向形成则不限定于大致直角的方向，安装孔及/或者安装部，也可以与连接凸缘的孔相对应而设置多个，气体集合室的形状，只要能够获得本发明的效果就不被特别地限定，此外，在不脱离本发明的主旨的范围内当然能够施加各种各样的变更。

Claims (1)

1.一种排气净化装置，在排气通路中途的壳内配备有使排气通过而进行净化的后处理装置，在该壳的出口侧借助连接凸缘连接向与该壳的轴心方向不同的朝向形成有排气通路的气体集合室，在气体集合室的出口侧连接向与排气通路的流路方向不同的朝向形成有第二排气通路的联络体，其特征为，
在上述气体集合室中，具有贯通排气通路的安装部而形成能够从外部对连接凸缘进行紧固的安装孔，并且在构成上述安装孔的安装部的外周具有对排气进行整流的曲面，进而在上述气体集合室中，配置有从构成安装孔的安装部向上述联络体的入口延伸的整流部材，
上述排气通路借助安装部及整流部材被划分为将排气整流而使排气流下的流路空间、和排气的一部分滞留而产生保温效果的滞留空间。
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