JP7327182B2 - Exhaust purification device - Google Patents

Exhaust purification device Download PDF

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JP7327182B2
JP7327182B2 JP2020011688A JP2020011688A JP7327182B2 JP 7327182 B2 JP7327182 B2 JP 7327182B2 JP 2020011688 A JP2020011688 A JP 2020011688A JP 2020011688 A JP2020011688 A JP 2020011688A JP 7327182 B2 JP7327182 B2 JP 7327182B2
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wall portion
exhaust
addition valve
fuel
passage
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JP2021116762A5 (en
JP2021116762A (en
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晶 福田
好二 百瀬
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Toyota Industries Corp
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Toyota Industries Corp
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Priority to AU2020286337A priority patent/AU2020286337B2/en
Priority to CN202110048301.1A priority patent/CN113250791B/en
Priority to DE102021101631.2A priority patent/DE102021101631A1/en
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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
    • F01N3/0253—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 adding fuel to exhaust gases
    • 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
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • 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
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • 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
    • 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
    • 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
    • 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
    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • 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
    • F01N3/36—Arrangements for supply of additional fuel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/208—Hydrocarbons
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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

Description

本発明は、排気浄化装置に関する。 The present invention relates to an exhaust purification device.

従来の排気浄化装置としては、例えば特許文献１に記載されている技術が知られている。特許文献１に記載の排気浄化装置は、エンジンの過給機の排気下流側に接続された排気管と、この排気管内に設けられた酸化触媒、ＮＯｘ吸蔵触媒及びＤＰＦと、排気管の分岐部に支持部材を介して配設され、酸化触媒へ添加剤としての燃料を供給する燃料添加インジェクタ（燃料添加弁）とを備えている。支持部材の内部には、燃料添加インジェクタから噴射される燃料が通過する噴射通路が形成されている。また、排気浄化装置は、支持部材と排気管とを連結するガス流入管を備えている。ガス流入管の一端は、噴射通路の燃料添加インジェクタ側に穿設されたガス流入孔に接続されている。ガス流入管の他端は、排気管の分岐部に接続されている。 BACKGROUND ART As a conventional exhaust emission control device, for example, the technology described in Patent Literature 1 is known. The exhaust purification device described in Patent Document 1 includes an exhaust pipe connected to the exhaust downstream side of a turbocharger of an engine, an oxidation catalyst, a NOx storage catalyst and a DPF provided in the exhaust pipe, and a branch portion of the exhaust pipe. and a fuel addition injector (fuel addition valve) disposed via a support member to supply fuel as an additive to the oxidation catalyst. An injection passage through which fuel injected from the fuel addition injector passes is formed inside the support member. Further, the exhaust purification device includes a gas inlet pipe that connects the support member and the exhaust pipe. One end of the gas inflow pipe is connected to a gas inflow hole drilled in the injection passage on the side of the fuel addition injector. The other end of the gas inflow pipe is connected to the branch of the exhaust pipe.

特開２００９－１１５０５７号公報JP 2009-115057 A

上記従来技術においては、排気管内からガス流入管を通って噴射通路へと排気ガスが流れることで、噴射通路の壁面に燃料が付着することを防止している。しかし、ガス流入管から噴射通路に排気ガスが導入されるときに、排気ガスの流れの偏りが生じることで、燃料添加インジェクタから噴射される燃料噴霧の流れが乱れることがある。この場合には、燃料噴霧の巻き返りによって燃料添加インジェクタの噴射口に燃料噴霧が付着し、デポジットの要因となるおそれがある。 In the above conventional technology, the exhaust gas flows from the exhaust pipe through the gas inflow pipe to the injection passage, thereby preventing the fuel from adhering to the wall surface of the injection passage. However, when the exhaust gas is introduced into the injection passage from the gas inflow pipe, the flow of the exhaust gas may become uneven, which may disturb the flow of the fuel spray injected from the fuel addition injector. In this case, the fuel spray may adhere to the injection port of the fuel addition injector due to the rewinding of the fuel spray, which may cause deposits.

本発明の目的は、燃料添加弁に付着する燃料噴霧を低減することができる排気浄化装置を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust purification system capable of reducing fuel spray adhering to a fuel addition valve.

本発明の一態様は、内燃機関から排出される排気ガスを浄化する排気浄化装置において、内燃機関と接続された排気通路と、排気通路に向けて燃料を噴射する燃料添加弁と、排気通路と連通すると共に燃料添加弁から噴射される燃料が通過する噴射通路を形成する円筒状の内壁部と、内壁部の径方向外側に配置され、内壁部と協働して排気通路を流れる排気ガスを噴射通路における燃料添加弁側の領域に導入する導入流路を形成する外壁部とを備え、導入流路は、内壁部の円周方向に延在している。 One aspect of the present invention is an exhaust purification device for purifying exhaust gas emitted from an internal combustion engine, comprising an exhaust passage connected to the internal combustion engine, a fuel addition valve for injecting fuel toward the exhaust passage, and an exhaust passage. A cylindrical inner wall that communicates with the fuel addition valve and forms an injection passage through which fuel injected from the fuel addition valve passes; and an outer wall portion forming an introduction passage leading to a region on the side of the fuel addition valve in the injection passage, the introduction passage extending in the circumferential direction of the inner wall portion.

このような排気浄化装置において、燃料添加弁から排気通路に向けて燃料が噴射されているときには、内燃機関からの排気ガスが導入流路を流れて噴射通路における燃料添加弁側の領域に導入されるため、噴射通路において燃料添加弁側に向かう排気ガスの流れが抑制される。ここで、導入流路は、内壁部の円周方向に延在している。つまり、導入流路は、内壁部の円周方向に広がっている。従って、排気ガスが導入流路から噴射通路における燃料添加弁側の領域に導入される際に、内壁部の円周方向に対する排気ガスの流れの偏りが少なくなるため、燃料添加弁から噴射される燃料噴霧の流れが乱れにくくなる。このため、燃料噴霧自体の流れによる燃料噴霧の巻き返りが低減される。これにより、燃料添加弁に付着する燃料噴霧が低減される。 In such an exhaust purification device, when fuel is injected from the fuel addition valve toward the exhaust passage, the exhaust gas from the internal combustion engine flows through the introduction passage and is introduced into the region of the injection passage on the fuel addition valve side. Therefore, the flow of exhaust gas toward the fuel addition valve side in the injection passage is suppressed. Here, the introduction channel extends in the circumferential direction of the inner wall portion. That is, the introduction channel extends in the circumferential direction of the inner wall portion. Therefore, when the exhaust gas is introduced from the introduction passage into the region on the side of the fuel addition valve in the injection passage, the deviation of the flow of the exhaust gas in the circumferential direction of the inner wall portion is reduced, so that the exhaust gas is injected from the fuel addition valve. The flow of fuel spray is less likely to be disturbed. Therefore, the curling-up of the fuel spray due to the flow of the fuel spray itself is reduced. As a result, fuel spray adhering to the fuel addition valve is reduced.

内壁部の燃料添加弁側には、内壁部の内部を覆う庇部が設けられており、庇部は、燃料添加弁から噴射される燃料を貫通させる開口部を有してもよい。このような構成では、燃料添加弁から排気通路に向けて燃料が噴射されていないときには、排気ガスが噴射通路を燃料添加弁側に向かって流れても、排気ガスが庇部に当たるため、排気ガスが燃料添加弁に到達することが抑制される。一方、燃料添加弁から排気通路に向かって燃料が噴射されているときには、噴射通路において燃料添加弁側に向かう若干の排気ガスの流れによって、燃料噴霧が燃料添加弁に向かって飛んでも、燃料噴霧が庇部に当たる。従って、燃料添加弁に付着する燃料噴霧が更に低減される。 An eaves portion that covers the inside of the inner wall portion is provided on the inner wall portion on the side of the fuel addition valve, and the eaves portion may have an opening through which fuel injected from the fuel addition valve passes. In such a configuration, when the fuel is not injected from the fuel addition valve toward the exhaust passage, even if the exhaust gas flows through the injection passage toward the fuel addition valve, the exhaust gas hits the eaves, so the exhaust gas is is suppressed from reaching the fuel addition valve. On the other hand, when fuel is injected from the fuel addition valve toward the exhaust passage, even if fuel spray flies toward the fuel addition valve due to a slight flow of exhaust gas toward the fuel addition valve in the injection passage, the fuel spray hits the canopy. Therefore, fuel spray adhering to the fuel addition valve is further reduced.

外壁部は、内壁部の全周にわたって内壁部を取り囲むように配置されており、導入流路は、内壁部の円周方向に全周にわたって延在していてもよい。このような構成では、排気ガスが導入流路を内壁部の円周方向に全周にわたって流れる。従って、排気ガスが導入流路から噴射通路における燃料添加弁側の領域に導入される際に、内壁部の円周方向に対する排気ガスの流れの偏りが更に少なくなるため、燃料添加弁から噴射される燃料噴霧の流れが更に乱れにくくなる。これにより、燃料添加弁に付着する燃料噴霧が一層低減される。 The outer wall may be arranged to surround the inner wall over the entire circumference of the inner wall, and the introduction channel may extend over the entire circumference of the inner wall in the circumferential direction. In such a configuration, the exhaust gas flows through the introduction channel over the entire circumference of the inner wall portion in the circumferential direction. Therefore, when the exhaust gas is introduced from the introduction passage into the region on the side of the fuel addition valve in the injection passage, the deviation of the flow of the exhaust gas with respect to the circumferential direction of the inner wall portion is further reduced. This makes the flow of the fuel spray to be less likely to be disturbed. This further reduces fuel spray adhering to the fuel addition valve.

外壁部には、外壁部の円周方向に延在するように外壁部の径方向内側に突出した突出部が設けられており、突出部の先端面には、雌ネジが切られており、内壁部の外周面には、雌ネジと螺合する雄ネジが切られていてもよい。このような構成では、内壁部を外壁部の張出部に対してねじ込むことにより、内壁部と外壁部とが容易に組み付けられる。従って、排気浄化装置の製造工程の簡素化を図ることができる。 The outer wall portion is provided with a protruding portion that protrudes radially inward from the outer wall portion so as to extend in the circumferential direction of the outer wall portion. An outer peripheral surface of the inner wall portion may be provided with a male thread that engages with the female thread. In such a configuration, the inner wall and the outer wall can be easily assembled by screwing the inner wall into the projecting portion of the outer wall. Therefore, it is possible to simplify the manufacturing process of the exhaust emission control device.

本発明によれば、燃料添加弁に付着する燃料噴霧を低減することができる。 According to the present invention, fuel spray adhering to the fuel addition valve can be reduced.

本発明の第１実施形態に係る排気浄化装置を示す概略構成図である。1 is a schematic configuration diagram showing an exhaust purification device according to a first embodiment of the present invention; FIG. 本発明の第１実施形態に係る排気浄化装置の主要部を示す断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the principal part of the exhaust gas purification device which concerns on 1st Embodiment of this invention. 図２のIII－III線断面図を排気ガスの流れと共に示す図である。FIG. 3 is a diagram showing a cross-sectional view taken along the line III-III of FIG. 2 together with the flow of exhaust gas; 図２に示された燃料添加弁から燃料が噴射されたときの排気ガスの流れを示す断面図である。FIG. 3 is a cross-sectional view showing the flow of exhaust gas when fuel is injected from the fuel addition valve shown in FIG. 2; 比較例としての排気浄化装置の主要部を示す断面図である。FIG. 3 is a cross-sectional view showing a main part of an exhaust purification device as a comparative example; 本発明の第２実施形態に係る排気浄化装置の主要部を示す断面図である。FIG. 5 is a cross-sectional view showing a main part of an exhaust purification device according to a second embodiment of the invention; 図６のVII－VII線断面図を排気ガスの流れと共に示す図である。FIG. 7 is a diagram showing a cross-sectional view taken along the line VII-VII of FIG. 6 together with the flow of exhaust gas; 図６に示された燃料添加弁から燃料が噴射されたときの排気ガスの流れを示す断面図である。FIG. 7 is a cross-sectional view showing the flow of exhaust gas when fuel is injected from the fuel addition valve shown in FIG. 6; 本発明の第３実施形態に係る排気浄化装置の主要部を示す断面図である。FIG. 10 is a cross-sectional view showing a main part of an exhaust purification device according to a third embodiment of the invention; 図９に示された内壁部及び外壁部を組み付ける様子を示す断面図である。FIG. 10 is a cross-sectional view showing how the inner wall portion and the outer wall portion shown in FIG. 9 are assembled; 図９のXI－XI線断面図を排気ガスの流れと共に示す図である。FIG. 10 is a diagram showing a cross-sectional view taken along the line XI-XI of FIG. 9 together with the flow of exhaust gas; 図９に示された燃料添加弁から燃料が噴射されたときの排気ガスの流れを示す断面図である。FIG. 10 is a cross-sectional view showing the flow of exhaust gas when fuel is injected from the fuel addition valve shown in FIG. 9;

以下、本発明の実施形態について、図面を参照して詳細に説明する。なお、図面において同一または同等の要素には同じ符号を付し、重複する説明を省略する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

図１は、本発明の第１実施形態に係る排気浄化装置を示す概略構成図である。図１において、本実施形態の排気浄化装置１は、車両に搭載されている。排気浄化装置１は、内燃機関であるディーゼルエンジン２から排出される排気ガスを浄化する。ディーゼルエンジン２は、特に図示はしないが、複数の気筒にそれぞれ燃料を噴射する複数のインジェクタを有している。 FIG. 1 is a schematic configuration diagram showing an exhaust purification device according to a first embodiment of the present invention. In FIG. 1, an exhaust purification device 1 of this embodiment is mounted on a vehicle. The exhaust purification device 1 purifies exhaust gas discharged from a diesel engine 2, which is an internal combustion engine. Although not shown, the diesel engine 2 has a plurality of injectors for injecting fuel into a plurality of cylinders.

排気浄化装置１は、ディーゼルエンジン２に接続された排気管３を備えている。排気管３は、排気ガスが流れる排気通路４を形成している。従って、排気通路４は、ディーゼルエンジン２に接続されている。 The exhaust purification device 1 has an exhaust pipe 3 connected to a diesel engine 2 . The exhaust pipe 3 forms an exhaust passage 4 through which exhaust gas flows. Therefore, the exhaust passage 4 is connected to the diesel engine 2 .

また、排気浄化装置１は、排気通路４に上流側から下流側に向けて順に配設されたＤＯＣ５（ディーゼル酸化触媒）及びＤＰＦ６（ディーゼル排気微粒子除去フィルタ）を備えている。ＤＯＣ５は、排気ガスに含まれる粒子状物質（ＰＭ）を酸化して除去する。ＤＰＦ６は、排気ガスに含まれるＰＭを捕集する。 The exhaust purification device 1 also includes a DOC 5 (diesel oxidation catalyst) and a DPF 6 (diesel particulate filter) which are arranged in the exhaust passage 4 in order from the upstream side to the downstream side. The DOC 5 oxidizes and removes particulate matter (PM) contained in the exhaust gas. The DPF 6 collects PM contained in the exhaust gas.

また、排気浄化装置１は、排気通路４におけるディーゼルエンジン２とＤＯＣ５との間に配設された燃料添加弁７を備えている。燃料添加弁７は、排気通路４に向けて燃料を噴射して添加する。燃料添加弁７の下端部には、排気通路４に向けて燃料を円錐状に噴射する噴射口７ａが設けられている（図２参照）。燃料添加弁７により添加される燃料は、主としてＤＰＦ６の再生を行う際に還元剤として使用される。 The exhaust purification device 1 also includes a fuel addition valve 7 disposed between the diesel engine 2 and the DOC 5 in the exhaust passage 4 . The fuel addition valve 7 injects and adds fuel toward the exhaust passage 4 . An injection port 7a for injecting fuel conically toward the exhaust passage 4 is provided at the lower end of the fuel addition valve 7 (see FIG. 2). The fuel added by the fuel addition valve 7 is mainly used as a reducing agent when the DPF 6 is regenerated.

図２は、本発明の第１実施形態に係る排気浄化装置の主要部を示す断面図である。図２において、排気浄化装置１は、円筒状の内壁部８と、この内壁部８の径方向外側に配置された外壁部９とを備えている。内壁部８及び外壁部９の下端部は、排気管３に固定されている。外壁部９の上端位置は、内壁部８の上端位置よりも高い。 FIG. 2 is a cross-sectional view showing the main part of the exhaust purification system according to the first embodiment of the invention. In FIG. 2 , the exhaust emission control device 1 includes a cylindrical inner wall portion 8 and an outer wall portion 9 arranged radially outside the inner wall portion 8 . Lower ends of the inner wall portion 8 and the outer wall portion 9 are fixed to the exhaust pipe 3 . The upper end position of the outer wall portion 9 is higher than the upper end position of the inner wall portion 8 .

内壁部８は、排気管３から燃料添加弁７側に突出するように設けられている。内壁部８は、燃料添加弁７から噴射される燃料が通過する噴射通路１０を形成している（図４参照）。噴射通路１０は、排気通路４と連通している。 The inner wall portion 8 is provided so as to protrude from the exhaust pipe 3 toward the fuel addition valve 7 side. The inner wall portion 8 forms an injection passage 10 through which fuel injected from the fuel addition valve 7 passes (see FIG. 4). The injection passage 10 communicates with the exhaust passage 4 .

外壁部９は、内壁部８の径方向外側における排気通路４の上流側（ディーゼルエンジン２側）に配置されている。外壁部９は、図３に示されるように、略弓状を呈している。外壁部９の上端部には、内壁部８側に張り出した張出部分１１が設けられている。 The outer wall portion 9 is arranged on the upstream side (the diesel engine 2 side) of the exhaust passage 4 on the radially outer side of the inner wall portion 8 . The outer wall portion 9 has a substantially arcuate shape, as shown in FIG. An upper end portion of the outer wall portion 9 is provided with a projecting portion 11 projecting toward the inner wall portion 8 side.

外壁部９は、内壁部８と協働して排気通路４を流れる排気ガスを噴射通路１０における燃料添加弁７側の領域に導入する導入流路１２を形成している。導入流路１２は、排気通路４と連通している。導入流路１２は、内壁部８の円周方向に延在している。内壁部８の上側における外壁部９側の領域には、噴射通路１０と導入流路１２とを連通させる連通口１３が形成されている。 The outer wall portion 9 cooperates with the inner wall portion 8 to form an introduction passage 12 that introduces exhaust gas flowing through the exhaust passage 4 into a region of the injection passage 10 on the side of the fuel addition valve 7 . The introduction passage 12 communicates with the exhaust passage 4 . The introduction channel 12 extends in the circumferential direction of the inner wall portion 8 . A communication port 13 that allows the injection passage 10 and the introduction passage 12 to communicate with each other is formed in a region on the upper side of the inner wall portion 8 on the side of the outer wall portion 9 .

内壁部８の上側における外壁部９の反対側の領域には、半円環状の接続壁部１４が設けられている。接続壁部１４の上端の高さ位置は、外壁部９の上端の高さ位置と一致している。接続壁部１４及び外壁部９の上端部には、上記の燃料添加弁７が取り付けられている。なお、外壁部９、内壁部８及び接続壁部１４は、例えば鋳造により排気管３と一体的に形成されている。 A semi-annular connecting wall portion 14 is provided in a region on the upper side of the inner wall portion 8 opposite to the outer wall portion 9 . The height position of the upper end of the connection wall portion 14 matches the height position of the upper end of the outer wall portion 9 . The fuel addition valve 7 is attached to the upper ends of the connecting wall portion 14 and the outer wall portion 9 . The outer wall portion 9, the inner wall portion 8, and the connection wall portion 14 are integrally formed with the exhaust pipe 3 by, for example, casting.

燃料添加弁７から燃料が噴射されている状態では、図４に示されるように、燃料の噴射に伴う流れによって噴射通路１０の上側領域（図中の領域Ｘ）の圧力が低下するため、噴射通路１０を上方に向かう排気ガスの流れ（図４中のＡ参照）と導入流路１２を上方に向かう排気ガスの流れ（図４中のＢ参照）とが発生する。 As shown in FIG. 4, when fuel is being injected from the fuel addition valve 7, the pressure in the upper region (region X in the drawing) of the injection passage 10 decreases due to the flow accompanying the fuel injection. An exhaust gas flow upward through the passage 10 (see A in FIG. 4) and an exhaust gas flow upward through the introduction passage 12 (see B in FIG. 4) are generated.

このとき、導入流路１２の幅寸法は、導入流路１２を上方に向かう排気ガスの流れが噴射通路１０を上方に向かう排気ガスの流れに打ち勝つような寸法に設定されている。なお、導入流路１２の幅寸法は、内壁部８の径方向に沿った導入流路１２の最大長さ寸法である。従って、導入流路１２を上方に向かう排気ガスの流れによって、噴射通路１０を上方に向かう排気ガスの流れが抑制される。 At this time, the width dimension of the introduction passage 12 is set so that the exhaust gas flow upward through the introduction passage 12 overcomes the exhaust gas flow upward through the injection passage 10 . The width dimension of the introduction channel 12 is the maximum length dimension of the introduction channel 12 along the radial direction of the inner wall portion 8 . Therefore, the upward flow of the exhaust gas through the injection passage 10 is suppressed by the upward flow of the exhaust gas through the introduction passage 12 .

このとき、図３に示されるように、導入流路１２の周方向中央側に存在する排気ガスは、噴射通路１０の径方向中心側に向かって直接流れる。導入流路１２の周方向端側に存在する排気ガスは、内壁部８に沿うように噴射通路１０の径方向中心側に向かって回り込んで流れる。このように排気ガスが噴射通路１０を内壁部８の円周方向に均一性良く流れ、内壁部８の円周方向に対する排気ガスの流れの偏りが比較的少ない。従って、燃料添加弁７から噴射される燃料噴霧Ｆが流れる方向に与える影響が少ない。 At this time, as shown in FIG. 3 , the exhaust gas existing on the circumferential center side of the introduction passage 12 flows directly toward the radial center side of the injection passage 10 . Exhaust gas existing at the circumferential end side of the introduction passage 12 flows along the inner wall portion 8 toward the radial center side of the injection passage 10 . In this manner, the exhaust gas flows through the injection passage 10 in the circumferential direction of the inner wall portion 8 with good uniformity, and the deviation of the flow of the exhaust gas in the circumferential direction of the inner wall portion 8 is relatively small. Therefore, the flow direction of the fuel spray F injected from the fuel addition valve 7 is less affected.

図５は、比較例としての排気浄化装置の主要部を示す断面図である。図５において、本比較例の排気浄化装置５０は、排気管３に固定された円筒状の壁部５１を備えている。壁部５１は、燃料添加弁７から噴射される燃料が通過する噴射通路５２を形成している。 FIG. 5 is a cross-sectional view showing the main part of an exhaust purification device as a comparative example. In FIG. 5 , an exhaust purification device 50 of this comparative example includes a cylindrical wall portion 51 fixed to the exhaust pipe 3 . The wall portion 51 forms an injection passage 52 through which fuel injected from the fuel addition valve 7 passes.

このような排気浄化装置５０では、噴射通路５２において燃料添加弁７側に向かう排気ガスの流れによって、燃料添加弁７の噴射口７ａから噴射される燃料噴霧Ｆの巻き返りが起こり、燃料噴霧Ｆの周辺部の燃料液滴Ｐが燃料添加弁７の噴射口７ａに付着し、噴射口７ａの詰まりの原因となるデポジットが生成されるおそれがある。 In such an exhaust purification device 50, the flow of exhaust gas toward the fuel addition valve 7 side in the injection passage 52 causes the fuel spray F injected from the injection port 7a of the fuel addition valve 7 to roll back, and the fuel spray F There is a risk that the fuel droplets P in the periphery of the fuel addition valve 7 will adhere to the injection port 7a of the fuel addition valve 7 and deposits that will cause clogging of the injection port 7a will be generated.

そのような不具合に対し、本実施形態では、燃料添加弁７から排気通路４に向けて燃料が噴射されているときには、ディーゼルエンジン２からの排気ガスが導入流路１２を流れて噴射通路１０における燃料添加弁７側の領域に導入されるため、噴射通路１０において燃料添加弁７側に向かう排気ガスの流れが抑制される。ここで、導入流路１２は、内壁部８の円周方向に延在している。つまり、導入流路１２は、内壁部８の円周方向に広がっている。従って、排気ガスが導入流路１２から噴射通路１０における燃料添加弁７側の領域に導入される際に、内壁部８の円周方向に対する排気ガスの流れの偏りが少なくなるため、燃料添加弁７から噴射される燃料噴霧Ｆの流れが乱れにくくなる。このため、燃料噴霧Ｆ自体の流れによる燃料噴霧Ｆの巻き返りが低減される。これにより、燃料添加弁７に付着する燃料噴霧Ｆが低減される。その結果、燃料添加弁７へのデポジットの生成を抑制し、燃料添加弁７の噴射口７ａの詰まりを抑制することが可能となる。 To address such a problem, in the present embodiment, when fuel is being injected from the fuel addition valve 7 toward the exhaust passage 4, the exhaust gas from the diesel engine 2 flows through the introduction passage 12 and enters the injection passage 10. Since the exhaust gas is introduced into the region on the fuel addition valve 7 side, the flow of the exhaust gas toward the fuel addition valve 7 side in the injection passage 10 is suppressed. Here, the introduction channel 12 extends in the circumferential direction of the inner wall portion 8 . That is, the introduction channel 12 extends in the circumferential direction of the inner wall portion 8 . Therefore, when the exhaust gas is introduced from the introduction passage 12 into the region of the injection passage 10 on the side of the fuel addition valve 7, the flow of the exhaust gas is less biased in the circumferential direction of the inner wall portion 8. The flow of the fuel spray F injected from 7 becomes less likely to be disturbed. Therefore, the curling-up of the fuel spray F due to the flow of the fuel spray F itself is reduced. As a result, the fuel spray F adhering to the fuel addition valve 7 is reduced. As a result, the formation of deposits on the fuel addition valve 7 can be suppressed, and clogging of the injection port 7a of the fuel addition valve 7 can be suppressed.

なお、本実施形態では、外壁部９は、内壁部８の径方向外側における排気通路４の上流側に配置されているが、特にそのような形態には限られない。外壁部９は、例えば内壁部８の径方向外側における排気通路４の下流側に配置されていてもよい。 In the present embodiment, the outer wall portion 9 is arranged on the upstream side of the exhaust passage 4 on the radially outer side of the inner wall portion 8, but it is not particularly limited to such a form. The outer wall portion 9 may be arranged, for example, on the downstream side of the exhaust passage 4 on the radially outer side of the inner wall portion 8 .

図６は、本発明の第２実施形態に係る排気浄化装置の主要部を示す断面図である。図６において、本実施形態の排気浄化装置１は、円筒状の内壁部２０と、この内壁部２０の径方向外側に配置された上記の外壁部９とを備えている。 FIG. 6 is a cross-sectional view showing a main part of an exhaust purification device according to a second embodiment of the invention. In FIG. 6, the exhaust emission control device 1 of this embodiment includes a cylindrical inner wall portion 20 and the outer wall portion 9 arranged radially outside the inner wall portion 20 .

内壁部２０は、図６及び図７に示されるように、上記の第１実施形態における内壁部８と同じ構造を呈する壁本体２１と、この壁本体２１の上端部に設けられ、内壁部２０の内部を覆う円形状の庇部２２とを有している。庇部２２は、内壁部２０の上側（燃料添加弁７側）に設けられている。庇部２２は、燃料添加弁７から噴射される燃料を貫通させる円形状の開口部２２ａを有している。開口部２２ａは、上記の連通口１３と協働して噴射通路１０と導入流路１２とを連通させる連通口を形成している。 As shown in FIGS. 6 and 7, the inner wall portion 20 includes a wall body 21 having the same structure as the inner wall portion 8 in the first embodiment, and an upper end portion of the wall body 21. The inner wall portion 20 It has a circular eaves portion 22 that covers the inside of the housing. The eaves portion 22 is provided on the upper side of the inner wall portion 20 (on the side of the fuel addition valve 7). The eaves portion 22 has a circular opening 22a through which the fuel injected from the fuel addition valve 7 passes. The opening 22a forms a communication port that cooperates with the communication port 13 to allow the injection passage 10 and the introduction passage 12 to communicate with each other.

このような排気浄化装置１において、燃料添加弁７から燃料が噴射されていない状態（図６参照）では、排気通路４を流れる排気ガスが噴射通路１０を燃料添加弁７側に向かって流れても、当該排気ガスが庇部２２に当たる。従って、排気ガスが燃料添加弁７に到達しにくい。 In such an exhaust purification device 1, when fuel is not injected from the fuel addition valve 7 (see FIG. 6), the exhaust gas flowing through the exhaust passage 4 flows through the injection passage 10 toward the fuel addition valve 7 side. Also, the exhaust gas hits the eaves portion 22 . Therefore, it is difficult for the exhaust gas to reach the fuel addition valve 7 .

一方、燃料添加弁７から燃料が噴射されている状態では、図８に示されるように、噴射通路１０に若干存在している排気ガスの流れによって、燃料添加弁７から噴射される燃料噴霧Ｆが巻き返り、燃料噴霧Ｆの周辺部の燃料液滴Ｐが燃料添加弁７に向かって飛んでも、燃料液滴Ｐが庇部２２に当たる。従って、燃料噴霧Ｆの周辺部の燃料液滴Ｐが燃料添加弁７に到達しにくい。 On the other hand, when the fuel is being injected from the fuel addition valve 7, as shown in FIG. rolls up and the fuel droplets P in the periphery of the fuel spray F fly toward the fuel addition valve 7, the fuel droplets P hit the eaves portion 22. - 特許庁Therefore, it is difficult for the fuel droplets P around the fuel spray F to reach the fuel addition valve 7 .

このように本実施形態では、燃料添加弁７から排気通路４に向けて燃料が噴射されていないときには、排気ガスが噴射通路１０を燃料添加弁７側に向かって流れても、排気ガスが庇部２２に当たるため、排気ガスが燃料添加弁７に到達することが抑制される。一方、燃料添加弁７から排気通路４に向けて燃料が噴射されているときには、噴射通路１０において燃料添加弁７側に向かう若干の排気ガスの流れによって、燃料噴霧Ｆが燃料添加弁７に向かって飛んでも、燃料噴霧Ｆが庇部２２に当たる。従って、燃料添加弁７に付着する燃料噴霧Ｆが更に低減される。 As described above, in the present embodiment, when fuel is not injected from the fuel addition valve 7 toward the exhaust passage 4, even if the exhaust gas flows through the injection passage 10 toward the fuel addition valve 7, the exhaust gas is blocked. Since it hits the portion 22 , the exhaust gas is suppressed from reaching the fuel addition valve 7 . On the other hand, when fuel is being injected from the fuel addition valve 7 toward the exhaust passage 4, the fuel spray F is directed toward the fuel addition valve 7 by a slight flow of exhaust gas toward the fuel addition valve 7 in the injection passage 10. Even if it flies, the fuel spray F hits the eaves part 22. - 特許庁Therefore, the fuel spray F adhering to the fuel addition valve 7 is further reduced.

図９は、本発明の第３実施形態に係る排気浄化装置の主要部を示す断面図である。図９において、本実施形態の排気浄化装置１は、円筒状の内壁部３０と、この内壁部３０の径方向外側に配置された円筒状の外壁部３１とを備えている。外壁部３１は、排気管３と一体化されている。外壁部３１の上端位置は、内壁部３０の上端位置よりも高い。 FIG. 9 is a cross-sectional view showing a main part of an exhaust purification system according to a third embodiment of the invention. In FIG. 9, the exhaust emission control device 1 of the present embodiment includes a cylindrical inner wall portion 30 and a cylindrical outer wall portion 31 arranged radially outside the inner wall portion 30 . The outer wall portion 31 is integrated with the exhaust pipe 3 . The upper end position of the outer wall portion 31 is higher than the upper end position of the inner wall portion 30 .

内壁部３０は、燃料添加弁７から噴射される燃料が通過する噴射通路３２を形成している。噴射通路３２は、排気通路４と連通している。内壁部３０は、壁本体３３と、この壁本体３３の上端部に設けられ、内壁部３０の内部を覆う円形状の庇部３４とを有している。庇部３４は、燃料添加弁７から噴射される燃料を貫通させる円形状の開口部３４ａを有している。 The inner wall portion 30 forms an injection passage 32 through which fuel injected from the fuel addition valve 7 passes. The injection passage 32 communicates with the exhaust passage 4 . The inner wall portion 30 has a wall main body 33 and a circular eaves portion 34 provided at the upper end portion of the wall main body 33 and covering the inside of the inner wall portion 30 . The eaves portion 34 has a circular opening 34a through which the fuel injected from the fuel addition valve 7 passes.

外壁部３１は、内壁部３０の円周方向の全周にわたって内壁部３０を取り囲むように配置されている。外壁部３１は、内壁部３０と協働して排気通路４を流れる排気ガスを噴射通路３２における燃料添加弁７側の領域に導入する導入流路３５を形成している。導入流路３５は、内壁部３０の円周方向に全周にわたって延在している。庇部３４の開口部３４ａは、噴射通路３２と導入流路３５とを連通させる連通口を形成している。 The outer wall portion 31 is arranged to surround the inner wall portion 30 along the entire circumferential direction of the inner wall portion 30 . The outer wall portion 31 cooperates with the inner wall portion 30 to form an introduction passage 35 that introduces the exhaust gas flowing through the exhaust passage 4 into the region of the injection passage 32 on the side of the fuel addition valve 7 . The introduction channel 35 extends along the entire circumference of the inner wall portion 30 in the circumferential direction. The opening 34a of the eaves 34 forms a communication port that allows the injection passage 32 and the introduction passage 35 to communicate with each other.

外壁部３１は、壁本体３６と、この壁本体３６の上端部に設けられ、外壁部３１の径方向内側に張り出した円環状の張出部分３７とを有している。張出部分３７の径方向内側の領域は、図１０に示されるように、円形状の開口部３７ａとなっている。開口部３７ａの径は、外壁部３１の外径よりも大きい。張出部分３７には、上記の燃料添加弁７が取り付けられている。 The outer wall portion 31 has a wall main body 36 and an annular projecting portion 37 provided at the upper end portion of the wall main body 36 and projecting radially inwardly of the outer wall portion 31 . A radially inner region of the projecting portion 37 forms a circular opening 37a, as shown in FIG. The diameter of the opening 37 a is larger than the outer diameter of the outer wall 31 . The fuel addition valve 7 described above is attached to the projecting portion 37 .

外壁部３１の下端部には、外壁部３１の径方向内側に突出した突出部３８が設けられている。突出部３８は、図１０及び図１１に示されるように、外壁部３１の円周方向全周の１／２よりも長くなるように形成されている。外壁部３１の円周方向に沿った突出部３８の長さは、例えば外壁部３１の円周方向全周の３／４程度である。 A lower end portion of the outer wall portion 31 is provided with a protruding portion 38 that protrudes radially inward of the outer wall portion 31 . As shown in FIGS. 10 and 11, the projecting portion 38 is formed to be longer than 1/2 of the entire circumference of the outer wall portion 31 in the circumferential direction. The length of the projecting portion 38 along the circumferential direction of the outer wall portion 31 is, for example, about 3/4 of the entire circumference of the outer wall portion 31 in the circumferential direction.

突出部３８の先端面３８ａには、雌ネジ３９が切られている。内壁部３０の壁本体３３の外周面３３ａの下側部分には、雌ネジ３９と螺合する雄ネジ４０が切られている。雄ネジ４０は、壁本体３３の外周面３３ａの全周にわたって設けられている。 A female screw 39 is cut in the tip surface 38 a of the projecting portion 38 . A male thread 40 to be screwed with the female thread 39 is cut in the lower portion of the outer peripheral surface 33 a of the wall body 33 of the inner wall portion 30 . The male screw 40 is provided over the entire circumference of the outer peripheral surface 33 a of the wall body 33 .

このような内壁部３０及び外壁部３１を組み付けるときは、図１０に示されるように、内壁部３０を外壁部３１の開口部３７ａから外壁部３１の内部に挿入し、内壁部３０の雄ネジ４０が外壁部３１の雌ネジ３９と螺合するように、内壁部３０を外壁部３１の突出部３８に対してねじ込んで締め付ける。これにより、図９に示されるように、内壁部３０が外壁部３１の突出部３８に固定される。 When assembling the inner wall portion 30 and the outer wall portion 31, as shown in FIG. The inner wall portion 30 is screwed onto the projecting portion 38 of the outer wall portion 31 so that the inner wall portion 30 is screwed into the female thread 39 of the outer wall portion 31 and tightened. As a result, the inner wall portion 30 is fixed to the projecting portion 38 of the outer wall portion 31, as shown in FIG.

以上のような排気浄化装置１において、導入流路３５は、内壁部３０の円周方向に全周にわたって延在している。このため、排気通路４からの排気ガスは、図１１及び図１２に示されるように、導入流路３５を内壁部３０の円周方向の全周にわたって流れるようになる。従って、導入流路３５を流れる排気ガスは、内壁部３０の円周方向の全周から噴射通路３２に導入される。 In the exhaust purification device 1 as described above, the introduction passage 35 extends along the entire circumference of the inner wall portion 30 in the circumferential direction. Therefore, as shown in FIGS. 11 and 12 , the exhaust gas from the exhaust passage 4 flows through the introduction passage 35 over the entire circumference of the inner wall portion 30 . Therefore, the exhaust gas flowing through the introduction passage 35 is introduced into the injection passage 32 from the entire circumference of the inner wall portion 30 in the circumferential direction.

このように本実施形態によれば、排気ガスが導入流路３５を内壁部３０の円周方向に全周にわたって流れる。従って、排気ガスが導入流路３５から噴射通路３２における燃料添加弁７側の領域に導入される際に、内壁部３０の円周方向に対する排気ガスの流れの偏りが更に少なくなるため、燃料添加弁７から噴射される燃料噴霧Ｆの流れが更に乱れにくくなる。これにより、燃料添加弁７に付着する燃料噴霧Ｆが一層低減される。 Thus, according to this embodiment, the exhaust gas flows through the introduction passage 35 over the entire circumference of the inner wall portion 30 in the circumferential direction. Therefore, when the exhaust gas is introduced from the introduction passage 35 into the region of the injection passage 32 on the side of the fuel addition valve 7, the deviation of the flow of the exhaust gas in the circumferential direction of the inner wall portion 30 is further reduced. The flow of the fuel spray F injected from the valve 7 becomes more difficult to be disturbed. As a result, the fuel spray F adhering to the fuel addition valve 7 is further reduced.

また、本実施形態では、内壁部３０を外壁部３１の突出部３８に対してねじ込むことにより、内壁部３０と外壁部３１とが容易に組み付けられる。従って、排気浄化装置１の製造工程の簡素化を図ることができる。 Further, in this embodiment, the inner wall portion 30 and the outer wall portion 31 can be easily assembled by screwing the inner wall portion 30 into the projecting portion 38 of the outer wall portion 31 . Therefore, the manufacturing process of the exhaust emission control device 1 can be simplified.

なお、本実施形態では、内壁部３０の燃料添加弁７側に円形状の庇部３４が設けられているが、特にその形態には限られず、庇部３４は無くてもよい。 In this embodiment, the circular eaves portion 34 is provided on the fuel addition valve 7 side of the inner wall portion 30, but the shape is not particularly limited, and the eaves portion 34 may be omitted.

また、本実施形態では、外壁部３１が排気管３と一体化されているが、特にその形態には限られず、内壁部３０が排気管３と一体化されていてもよい。 Further, although the outer wall portion 31 is integrated with the exhaust pipe 3 in this embodiment, the configuration is not particularly limited, and the inner wall portion 30 may be integrated with the exhaust pipe 3 .

また、本実施形態では、内壁部３０と外壁部３１とがネジ止めされているが、特にその形態には限られず、外壁部３１が内壁部３０の全周にわたって内壁部３０を取り囲むように配置されているのであれば、例えば内壁部３０と外壁部３１とが複数箇所でビス止めされていてもよい。 In addition, in the present embodiment, the inner wall portion 30 and the outer wall portion 31 are screwed together, but the configuration is not particularly limited to this. If so, the inner wall portion 30 and the outer wall portion 31 may be screwed at a plurality of locations, for example.

以上、本発明の実施形態について幾つか説明してきたが、本発明は上記実施形態には限定されない。例えば、上記実施形態の排気浄化装置１は、ＤＰＦ６を備えているが、本発明は、例えばフィルタとしてディーゼルＰＭ，ＮＯｘ同時低減触媒（ＤＰＮＲ）等を備えた排気浄化装置にも適用可能である。 Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the exhaust gas purification device 1 of the above embodiment includes the DPF 6, but the present invention can also be applied to an exhaust gas purification device including a diesel PM and NOx simultaneous reduction catalyst (DPNR) as a filter.

また、本発明は、特にディーゼルエンジンには限られず、ガソリンエンジンから排出される排気ガスを浄化する排気浄化装置にも適用可能である。 Moreover, the present invention is not particularly limited to diesel engines, but can also be applied to exhaust purification devices for purifying exhaust gas emitted from gasoline engines.

１…排気浄化装置、２…ディーゼルエンジン（内燃機関）、４…排気通路、７…燃料添加弁、８…内壁部、９…外壁部、１０…噴射通路、１２…導入流路、２０…内壁部、２２…庇部、２２ａ…開口部、３０…内壁部、３１…外壁部、３２…噴射通路、３３ａ…外周面、３４…庇部、３４ａ…開口部、３５…導入流路、３８…突出部、３８ａ…先端面、３９…雌ネジ、４０…雄ネジ、Ｆ…燃料噴霧。 DESCRIPTION OF SYMBOLS 1... Exhaust gas purification apparatus 2... Diesel engine (internal combustion engine) 4... Exhaust passage 7... Fuel addition valve 8... Inner wall part 9... Outer wall part 10... Injection passage 12... Introductory flow path 20... Inner wall Portion 22 Eaves 22a Opening 30 Inner wall 31 Outer wall 32 Ejection passage 33a Peripheral surface 34 Eaves 34a Opening 35 Introduction flow path 38 Protruding part 38a... Tip surface 39... Female screw 40... Male screw F... Fuel spray.

Claims (4)

内燃機関から排出される排気ガスを浄化する排気浄化装置において、
前記内燃機関と接続され、前記排気ガスが流れる排気通路を形成する排気管と、
前記排気通路に向けて燃料を噴射する燃料添加弁と、
前記排気通路と連通すると共に前記燃料添加弁から噴射される燃料が通過する噴射通路を形成する円筒状の内壁部と、
前記内壁部の径方向外側に配置され、前記内壁部と協働して前記排気通路を流れる前記排気ガスを前記噴射通路における前記燃料添加弁側の領域に導入する導入流路を形成する外壁部とを備え、
前記内壁部及び前記外壁部は、前記排気管から前記燃料添加弁側に突出するように前記排気管に固定されており、
前記導入流路は、前記排気通路と連通するように前記排気管の外側に配置されていると共に、前記内壁部の円周方向に延在している排気浄化装置。 In an exhaust purification device for purifying exhaust gas emitted from an internal combustion engine,
an exhaust pipe connected to the internal combustion engine and forming an exhaust passage through which the exhaust gas flows ;
a fuel addition valve that injects fuel toward the exhaust passage;
a cylindrical inner wall portion communicating with the exhaust passage and forming an injection passage through which fuel injected from the fuel addition valve passes;
An outer wall portion that is disposed radially outward of the inner wall portion and forms an introduction flow passage that cooperates with the inner wall portion to introduce the exhaust gas flowing through the exhaust passage into a region of the injection passage on the fuel addition valve side. and
The inner wall portion and the outer wall portion are fixed to the exhaust pipe so as to protrude from the exhaust pipe toward the fuel addition valve,
The exhaust purification device , wherein the introduction passage is arranged outside the exhaust pipe so as to communicate with the exhaust passage and extends in the circumferential direction of the inner wall portion. 前記内壁部の前記燃料添加弁側には、前記内壁部の内部を覆う庇部が設けられており、
前記庇部は、前記燃料添加弁から噴射される燃料を貫通させる開口部を有する請求項１記載の排気浄化装置。 A canopy portion covering the inside of the inner wall portion is provided on the fuel addition valve side of the inner wall portion,
2. The exhaust emission control system according to claim 1, wherein said eaves portion has an opening through which fuel injected from said fuel addition valve passes. 前記外壁部は、前記内壁部の全周にわたって前記内壁部を取り囲むように配置されており、
前記導入流路は、前記内壁部の円周方向に全周にわたって延在している請求項１または２記載の排気浄化装置。 The outer wall is arranged to surround the inner wall over the entire circumference of the inner wall,
3. The exhaust emission control device according to claim 1, wherein the introduction channel extends along the entire circumference of the inner wall portion in the circumferential direction. 前記外壁部には、前記外壁部の円周方向に延在するように前記外壁部の径方向内側に突出した突出部が設けられており、
前記突出部の先端面には、雌ネジが切られており、
前記内壁部の外周面には、前記雌ネジと螺合する雄ネジが切られている請求項３記載の排気浄化装置。 The outer wall portion is provided with a protruding portion that protrudes radially inward of the outer wall portion so as to extend in the circumferential direction of the outer wall portion,
A female thread is cut on the tip surface of the protrusion,
4. The exhaust emission control system according to claim 3, wherein an outer peripheral surface of said inner wall portion is provided with a male thread that engages with said female thread.
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