JP2017014975A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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JP2017014975A
JP2017014975A JP2015131603A JP2015131603A JP2017014975A JP 2017014975 A JP2017014975 A JP 2017014975A JP 2015131603 A JP2015131603 A JP 2015131603A JP 2015131603 A JP2015131603 A JP 2015131603A JP 2017014975 A JP2017014975 A JP 2017014975A
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exhaust gas
cylindrical
mixer
casing
cylindrical portion
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JP6215873B2 (en
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佐藤　大輔
Daisuke Sato
大輔 佐藤
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Yutaka Giken Co Ltd
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Yutaka Giken Co Ltd
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Priority to JP2015131603A priority Critical patent/JP6215873B2/en
Priority to PCT/JP2016/056746 priority patent/WO2017002397A1/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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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

Abstract

PROBLEM TO BE SOLVED: To reduce cost and facilitate assuring quality of exhaust emission control device in which a mixer for mixing reductant agent supplied in an exhaust gas passage with exhaust gas is arranged at an upstream side than a catalyst converter in a flowing direction of the exhaust gas.SOLUTION: A mixer 14 has a cylindrical part 23 and an end plate part 24 having its outer circumference cooperatively arranged at one end part of the cylindrical part 23 while having a plurality of slit-like openings 25 extending along a radial direction of the cylindrical part 23 and formed into a cup shape with a bottom part. A cylindrical casing 17 constituting an outer contour of a catalyst converter 13 is formed to cause one end part of the cylindrical part 23 to be fitted into the upstream end of the casing 17, a downstream end part of a cylinder member 21 having a circle cross sectional shape to guide exhaust gas to the mixer 14 and the other end of the cylindrical part 23 are fitted to each other, and one end part and the other end of the cylindrical part 23 are welded outside the exhaust gas passage 19 at the upstream end of the casing 17 and the downstream end of the cylinder member 21.SELECTED DRAWING: Figure 2

Description

本発明は、排ガス通路内に供給された還元剤を排ガスと混合するミキサーが、排ガスの流通方向で触媒コンバータよりも上流側に配設される排ガス浄化装置に関する。   The present invention relates to an exhaust gas purification apparatus in which a mixer that mixes a reducing agent supplied into an exhaust gas passage with exhaust gas is disposed upstream of a catalytic converter in the flow direction of the exhaust gas.

ＮＯX 触媒の上流側に、排ガス通路に供給された尿素水等の還元剤と、排ガスとを混合させるためのミキサーが設けられるようにした排ガス浄化装置が、従来から知られており、特許文献１で開示される排ガス浄化装置のミキサーは、外側リングと、その外側リング内に同軸に配置される内側リングと、外側リングの内周面および内側リングの外周面間に設けられる複数の旋回翼とを備えるように構成され、排ガス通路を形成する排気管の内周面に前記外側リングが溶接されている。また特許文献２で開示される排ガス浄化装置のミキサーは、円盤状のプレートに、そのプレートの複数箇所での切り起こしならびに切り起こし部分の折り曲げによって複数のフィン部が設けられるとともに、切り起こしに伴う複数の開口部が形成されて成り、排気通路をそれぞれ形成する一対の排気管間に挟まれるようにして前記プレートの外周部が一対の前記排気管に固定されている。 An exhaust gas purification apparatus in which a mixer for mixing a reducing agent such as urea water supplied to an exhaust gas passage and an exhaust gas is provided on the upstream side of the NO x catalyst has been conventionally known. The mixer of the exhaust gas purifying apparatus disclosed in 1 includes an outer ring, an inner ring disposed coaxially in the outer ring, and a plurality of swirl vanes provided between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. The outer ring is welded to the inner peripheral surface of the exhaust pipe that forms the exhaust gas passage. In addition, the mixer of the exhaust gas purifying apparatus disclosed in Patent Document 2 is provided with a plurality of fin portions provided on a disk-like plate by cutting and raising at a plurality of locations of the plate and bending of the raised portion, and accompanying the raising and lowering. A plurality of openings are formed, and an outer peripheral portion of the plate is fixed to the pair of exhaust pipes so as to be sandwiched between a pair of exhaust pipes that respectively form exhaust passages.

特開２０１１−１１１９２７号公報JP 2011-111927 A 特開２０１１−２５２４９８号公報JP 2011-252498 A

ところが上記特許文献１で開示されたものでは、ミキサーの中央部を還元剤が拡散することなくそのまま流通してしまうだけでなく、ミキサーの形状が複雑であって溶接の手間がかかって製造が難しく、しかも排気管の内周面にミキサーの外周を溶接によって結合しているので溶接の手間がかかって製造が難しくなるとともに溶接に伴うスパッタ等の異物が排気管内に混入する虞があり、コストの低減および品質の確保が難しいという課題があった。   However, in the one disclosed in Patent Document 1, not only does the reducing agent circulate through the central portion of the mixer without diffusing, but the shape of the mixer is complicated and it takes time and effort to weld, making it difficult to manufacture. In addition, since the outer periphery of the mixer is joined to the inner peripheral surface of the exhaust pipe by welding, it takes time for welding, making it difficult to manufacture, and there is a possibility that foreign matters such as spatter accompanying welding may be mixed in the exhaust pipe. There was a problem that reduction and quality assurance were difficult.

また上記特許文献２で開示されたものでは、プレートの外周部にはフィン部が配設されておらず、プレートの外周部が排気抵抗になってしまう。またミキサーを排気管に固定する構造が複雑であり、製造が難しく、コストの低減および品質の確保が難しいという課題があった。   Moreover, in what was disclosed by the said patent document 2, the fin part is not arrange | positioned in the outer peripheral part of a plate, but the outer peripheral part of a plate will become exhaust resistance. In addition, the structure for fixing the mixer to the exhaust pipe is complicated, which makes it difficult to manufacture, and it is difficult to reduce costs and ensure quality.

本発明は、かかる事情に鑑みてなされたものであり、コストの低減および品質の確保を容易とした排ガス浄化装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide an exhaust gas purification device that facilitates cost reduction and quality assurance.

上記目的を達成するために、本発明は、排ガス通路内に供給された還元剤を排ガスと混合するミキサーが、排ガスの流通方向で触媒コンバータよりも上流側に配設される排ガス浄化装置において、前記ミキサーが、前記排ガス通路の一部を形成する円筒部と、該円筒部の半径方向に沿って延びる複数のスリット状の開口部を有しつつ前記円筒部の一端部に外周が連設される端板部とを有して有底カップ状に形成され、前記触媒コンバータの外郭を構成する円筒状のケーシングが、該ケーシングの上流端部内に前記円筒部の一端部を嵌合させるように形成され、排ガスを前記ミキサーに導くようにして横断面形状を円形とした筒部材の下流端部と、前記円筒部の他端部とが相互に嵌合され、前記ケーシングの前記上流端部および前記筒部材の下流端部に、前記円筒部の前記一端部および前記他端部が前記排ガス通路の外側で溶接されることを特徴とする。   In order to achieve the above object, the present invention provides an exhaust gas purification apparatus in which a mixer for mixing a reducing agent supplied in an exhaust gas passage with exhaust gas is disposed upstream of a catalytic converter in a flow direction of exhaust gas. The mixer has a cylindrical portion that forms a part of the exhaust gas passage and a plurality of slit-shaped openings extending along a radial direction of the cylindrical portion, and an outer periphery is continuously provided at one end of the cylindrical portion. And a cylindrical casing that forms an outer shell of the catalytic converter so that one end of the cylindrical portion is fitted into the upstream end of the casing. And a downstream end of a cylindrical member having a circular cross section so as to guide the exhaust gas to the mixer and the other end of the cylindrical portion are fitted to each other, and the upstream end of the casing and Under the cylinder member The end, wherein said one end and said other end of the cylindrical portion is welded on the outside of the exhaust gas channel.

本発明の上記特徴によれば、ミキサーが、触媒コンバータのケーシングの上流端部と、ミキサーに排ガスを導く筒部材の下流端部とに、排ガス通路の外側で溶接されるので、スパッタ等の異物が排ガス通路内に混入することがない。しかも還元剤が溶接部に接触することがなく、溶接部が還元剤に接触し得る位置に配置されるものに比べると耐久性を高め得ることができる。またケーシングの上流端部および筒部材の下流端部と、ミキサーの円筒部の両端部とは嵌合して重なることになるので、その重なり部によって強度を高めることができる。またミキサーの周囲に排ガスの流れを阻害する部分がなく、ミキサーの有効径を大きくすることができる。   According to the above feature of the present invention, the mixer is welded to the upstream end of the casing of the catalytic converter and the downstream end of the cylindrical member that guides the exhaust gas to the mixer outside the exhaust gas passage. Does not enter the exhaust gas passage. In addition, the reducing agent does not come into contact with the welded portion, and durability can be improved as compared with the case where the welded portion is disposed at a position where the reducing portion can come into contact with the reducing agent. Further, since the upstream end portion of the casing and the downstream end portion of the cylindrical member and the both end portions of the cylindrical portion of the mixer are fitted and overlapped, the strength can be increased by the overlapping portion. Further, there is no part that hinders the flow of exhaust gas around the mixer, and the effective diameter of the mixer can be increased.

第１の実施の形態のディーゼルエンジンの排気系の要部縦断平面図である。It is a principal part longitudinal section top view of the exhaust system of the diesel engine of a 1st embodiment. 排ガス浄化装置の縦断面図である。It is a longitudinal cross-sectional view of an exhaust gas purification apparatus. 図２の３−３線断面図である。FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. 図３の４−４線に沿う断面図である。FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 第２の実施の形態の排ガス浄化装置の縦断面図である。It is a longitudinal cross-sectional view of the exhaust gas purification apparatus of 2nd Embodiment. 第３の実施の形態の排ガス浄化装置の縦断面図である。It is a longitudinal cross-sectional view of the exhaust gas purification apparatus of 3rd Embodiment.

以下、本発明の実施の形態を、添付の図面を参照しながら説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

本発明の第１の実施の形態について図１〜図４を参照しながら説明すると、先ず図１において、デイーゼルエンジンＥの排気系１１は、排ガス中のＣＯおよびＨＣを酸化除去する第１の触媒コンバータ１２と、第１の触媒コンバータ１２よりも下流側に配置される第２の触媒コンバータ１３と、ミキサー１４とを備え、ミキサー１４は、排気系１１が有する排ガス通路１９を流通する排ガスの流通方向２８に沿って第２の触媒コンバータ１３よりも上流側に配設されるようにして第１および第２の二次触媒コンバータ１２，１３間に介設され、前記ミキサー１４には、還元剤たとえば尿素水を供給する還元剤供給装置１５が接続される。   The first embodiment of the present invention will be described with reference to FIGS. 1 to 4. First, in FIG. 1, an exhaust system 11 of a diesel engine E is a first catalyst that oxidizes and removes CO and HC in exhaust gas. A converter 12, a second catalytic converter 13 disposed on the downstream side of the first catalytic converter 12, and a mixer 14 are provided, and the mixer 14 distributes exhaust gas flowing through an exhaust gas passage 19 included in the exhaust system 11. It is interposed between the first and second secondary catalytic converters 12 and 13 so as to be disposed upstream of the second catalytic converter 13 along the direction 28, and the mixer 14 includes a reducing agent. For example, a reducing agent supply device 15 that supplies urea water is connected.

図２を併せて参照して、第２の触媒コンバータ１３は、触媒を担持したハニカム構造のセラミックス１６が、円筒状のケーシング１７にマット１８を介して支持されて成り、排ガス中のＮＯX を還元除去する働きをする。 Referring also to FIG. 2, the second catalytic converter 13 is composed of a honeycomb-structured ceramic 16 supporting a catalyst supported by a cylindrical casing 17 via a mat 18 to convert NO x in exhaust gas. It works to reduce and remove.

前記ミキサー１４は、前記排ガス通路１９内で前記還元剤供給装置１５から供給される還元剤を排ガスと混合して第２の触媒コンバータ１３側に導くものであり、第１の触媒コンバータ１２から導出された排ガスは、上流端が第１の触媒コンバータ１２に接続される第１の排気管２０と、第１の排気管２０および前記ミキサー１４間を結ぶ第２の排気管２１とを介して前記ミキサー１４に導かれ、第１および第２の排気管２０，２１は前記排ガス通路１９の一部をそれぞれ形成する。   The mixer 14 mixes the reducing agent supplied from the reducing agent supply device 15 in the exhaust gas passage 19 with the exhaust gas and guides it to the second catalytic converter 13 side, and is derived from the first catalytic converter 12. The exhaust gas that has been discharged has the first exhaust pipe 20 whose upstream end is connected to the first catalytic converter 12 and the second exhaust pipe 21 that connects the first exhaust pipe 20 and the mixer 14 to each other. Guided to the mixer 14, the first and second exhaust pipes 20, 21 form part of the exhaust gas passage 19.

図３を併せて参照して、前記ミキサー１４は、前記排ガス通路１９の一部を形成する円筒部２３と、該円筒部２３の半径方向に沿って延びる複数のスリット状の開口部２５を有しつつ前記円筒部２３の一端部に外周が連設される端板部２４とを有して有底カップ状に形成される。   Referring also to FIG. 3, the mixer 14 has a cylindrical portion 23 that forms a part of the exhaust gas passage 19, and a plurality of slit-like openings 25 that extend along the radial direction of the cylindrical portion 23. However, it has an end plate portion 24 whose outer periphery is connected to one end portion of the cylindrical portion 23 and is formed into a bottomed cup shape.

前記端板部２４には、前記上流側排気管２０側に向かうにつれて小径となるようにしてテーパ状に形成される突部２４ａが設けられるとともに、前記開口部２５を相互間に形成するようにして前記円筒部２３および前記突部２４ａ間を放射状に結ぶ複数のブレード２４ｂが設けられる。   The end plate portion 24 is provided with a projecting portion 24a formed in a tapered shape so as to become smaller in diameter toward the upstream exhaust pipe 20 side, and the opening 25 is formed between them. A plurality of blades 24b that radially connect the cylindrical portion 23 and the protrusion 24a are provided.

図４を併せて参照して、前記ブレード２４ｂは、そのブレード幅Ｗ（図３参照）が前記円筒部２３の半径方向に沿う外方に向かうにつれて大きく、すなわち前記円筒部２３に近接するにつれて大きくなるように形成される。しかも各ブレード２４ｂの前記半径方向に沿う中間部には、前記円筒部２３の周方向に沿う前記ブレード２４ｂの幅方向中心線Ｌまわりで同一方向、同一角度θの捩じりが付与されており、それにより各ブレード２４ｂは前記円筒部２３の軸方向に広げられ、前記捩じり角度θは前記円筒部２３および前記突部２４ａに近接するにつれて小さくなるように設定される。   Referring also to FIG. 4, the blade 24 b has a blade width W (see FIG. 3) that increases as it goes outward along the radial direction of the cylindrical portion 23, that is, increases as it approaches the cylindrical portion 23. Formed to be. Moreover, torsion of the same direction and the same angle θ is given to the intermediate portion along the radial direction of each blade 24b around the center line L in the width direction of the blade 24b along the circumferential direction of the cylindrical portion 23. Thus, each blade 24b is expanded in the axial direction of the cylindrical portion 23, and the torsion angle θ is set so as to become smaller as it approaches the cylindrical portion 23 and the protruding portion 24a.

前記突部２４ａおよび前記ブレード２４ｂを有する前記端板部２４および前記円筒部２３の一端部は、プレスによる深絞り加工によって形成され、端板部２４および円筒部２３の連設部は外側に膨らんだ湾曲部として形成される。   One end portions of the end plate portion 24 and the cylindrical portion 23 having the protrusion 24a and the blade 24b are formed by deep drawing by pressing, and the connecting portions of the end plate portion 24 and the cylindrical portion 23 swell outward. It is formed as a curved part.

ところで前記ミキサー１４の前記円筒部２３は前記排ガス通路１９の一部を形成するものであり、前記端板部２４よりも排ガスの流通方向２８に沿う上流側で排ガス通路１９内に還元剤を供給するために、前記円筒部２３の軸方向中間部には、前記還元剤供給装置１５に接続される還元剤供給管２７が設けられる。   By the way, the cylindrical portion 23 of the mixer 14 forms a part of the exhaust gas passage 19, and supplies the reducing agent into the exhaust gas passage 19 upstream of the end plate portion 24 along the exhaust gas flow direction 28. In order to do so, a reducing agent supply pipe 27 connected to the reducing agent supply device 15 is provided at an axially intermediate portion of the cylindrical portion 23.

第２の触媒コンバータ１３の外郭を構成する円筒状の前記ケーシング１７は、該ケーシング１７の上流端部内に前記円筒部２３の一端部を嵌合させるように形成される。また前記ミキサー１４に排ガスを導くようにして横断面形状を円形とした筒部材である第２の排気管２１の下流端部と、前記円筒部２３の他端部とは相互に嵌合されるものであり、この実施の形態では、前記円筒部２３の他端部に第２の排気管２１の下流端部が嵌合される。すなわち第２の排気管２１は、前記ミキサー１４側に向かうにつれて大径となるテーパ部２１ａと、そのテーパ部２１ａの大径端に同軸に連なる円筒状の接続筒部２１ｂとを有しており、第２の排気管２１の下流端部である接続筒部２１ｂが前記円筒部２３の他端部に嵌合される。   The cylindrical casing 17 constituting the outline of the second catalytic converter 13 is formed so that one end portion of the cylindrical portion 23 is fitted into the upstream end portion of the casing 17. Further, the downstream end portion of the second exhaust pipe 21 which is a cylindrical member having a circular cross section so as to guide the exhaust gas to the mixer 14 and the other end portion of the cylindrical portion 23 are fitted to each other. In this embodiment, the downstream end portion of the second exhaust pipe 21 is fitted to the other end portion of the cylindrical portion 23. That is, the second exhaust pipe 21 has a tapered portion 21a having a diameter that increases toward the mixer 14, and a cylindrical connecting tube portion 21b that is coaxially connected to the large diameter end of the tapered portion 21a. The connecting cylinder portion 21 b that is the downstream end portion of the second exhaust pipe 21 is fitted to the other end portion of the cylindrical portion 23.

しかも前記ケーシング１７の前記上流端部に、前記円筒部２３の前記一端部が前記排ガス通路２６の外側で溶接され、また前記円筒部２３の他端部が、前記第２の排気管２１の接続筒部２１ｂに前記排ガス通路２６の外側で溶接される。   Moreover, one end of the cylindrical portion 23 is welded to the upstream end of the casing 17 outside the exhaust gas passage 26, and the other end of the cylindrical portion 23 is connected to the second exhaust pipe 21. The tube part 21b is welded outside the exhaust gas passage 26.

次にこの第１の実施の形態の作用について説明すると、ミキサー１４が、排ガス通路１９の一部を形成する円筒部２３と、該円筒部２３の半径方向に沿って延びる複数のスリット状の開口部２５を有しつつ前記円筒部２３の一端部に外周が連設される端板部２４とを有して有底カップ状に形成され、第２の触媒コンバータ１３の外郭を構成する円筒状のケーシング１７が、該ケーシング１７の上流端部内に前記円筒部２３の一端部を嵌合させるように形成され、排ガスを前記ミキサー１４に導くようにして横断面形状を円形とした第２の排気管２１の下流端部が前記円筒部２３の他端部に嵌合され、前記ケーシング１７の前記上流端部および前記筒部材２１の下流端部に、前記円筒部２３の前記一端部および前記他端部が前記排ガス通路１９の外側で溶接される。   Next, the operation of the first embodiment will be described. The mixer 14 includes a cylindrical portion 23 that forms a part of the exhaust gas passage 19, and a plurality of slit-shaped openings that extend along the radial direction of the cylindrical portion 23. A cylindrical shape that has a bottomed cup shape having an end plate portion 24 having an outer periphery continuously provided at one end portion of the cylindrical portion 23 while having a portion 25, and constitutes an outline of the second catalytic converter 13 A second exhaust gas having a circular cross-sectional shape so as to guide the exhaust gas to the mixer 14 so that one end portion of the cylindrical portion 23 is fitted into the upstream end portion of the casing 17. A downstream end portion of the pipe 21 is fitted to the other end portion of the cylindrical portion 23, and the one end portion of the cylindrical portion 23 and the other end portion are connected to the upstream end portion of the casing 17 and the downstream end portion of the cylindrical member 21. The end is the exhaust gas passage 19. It is welded on the outside.

したがってスパッタ等の異物が排ガス通路１９内に混入することがない。しかも還元剤が溶接部に接触することがなく、溶接部が還元剤に接触し得る位置に配置されるものに比べると耐久性を高め得ることができる。またケーシング１７の上流端部および第２の排気管２１の下流端部と、ミキサー１４の円筒部２３の両端部とは嵌合して重なることになるので、その重なり部によって強度を高めることができる。またミキサー１４の周囲に排ガスの流れを阻害する部分がなく、ミキサー１４の有効径を大きくすることができる。   Accordingly, foreign matter such as spatter is not mixed into the exhaust gas passage 19. In addition, the reducing agent does not come into contact with the welded portion, and durability can be improved as compared with the case where the welded portion is disposed at a position where the reducing portion can come into contact with the reducing agent. Further, since the upstream end portion of the casing 17 and the downstream end portion of the second exhaust pipe 21 and both end portions of the cylindrical portion 23 of the mixer 14 are fitted and overlapped with each other, the strength can be increased by the overlapping portion. it can. Further, there is no portion that hinders the flow of exhaust gas around the mixer 14, and the effective diameter of the mixer 14 can be increased.

しかも前記ミキサー１４の前記端板部２４および前記円筒部２３の一端部は、プレスによる深絞り加工によって形成されるので、精度よく形成することができ、前記円筒部２３の一端部の前記ケーシング１７に対する嵌合精度を高めることができ、また端板部２４および円筒部２３の連設部は外側に膨らんだ湾曲部として形成されるので、ミキサー１４内で排ガスおよび還元剤を効率よく攪拌することができる。   In addition, the end plate portion 24 and the one end portion of the cylindrical portion 23 of the mixer 14 are formed by deep drawing by pressing, so that they can be formed with high accuracy, and the casing 17 at one end portion of the cylindrical portion 23 can be formed. Since the connecting portion of the end plate portion 24 and the cylindrical portion 23 is formed as a curved portion that swells outward, the exhaust gas and the reducing agent can be efficiently stirred in the mixer 14. Can do.

本発明の第２の実施の形態について図５を参照しながら説明するが、上記第１の実施の形態に対応する部分には同一の参照符号を付して図示するのみとし、詳細な説明は省略する。   The second embodiment of the present invention will be described with reference to FIG. 5, but the parts corresponding to the first embodiment are only shown with the same reference numerals, and the detailed description is as follows. Omitted.

ミキサー１４には、第１の排気管２０および第２の排気管３１を介して排ガスが導かれるものであり、第１の排気管２０、第３の排気管３４およびミキサー１４でそれぞれ一部が形成される排ガス通路３２を流通する排ガスの流通方向３３に沿って第２の触媒コンバータ１３よりも上流側に前記ミキサー１４が配設される。   The exhaust gas is guided to the mixer 14 via the first exhaust pipe 20 and the second exhaust pipe 31, and a part of each of the first exhaust pipe 20, the third exhaust pipe 34 and the mixer 14 is provided. The mixer 14 is arranged upstream of the second catalytic converter 13 along the flow direction 33 of the exhaust gas flowing through the formed exhaust gas passage 32.

第２の触媒コンバータ１３の外郭を構成する円筒状の前記ケーシング１７は、該ケーシング１７の上流端部内に、前記ミキサー１４における円筒部２３の一端部を嵌合させるように形成される。また前記ミキサー１４に排ガスを導くようにして横断面形状を円形とした筒部材である第３の排気管３４の下流端部と、前記円筒部２３の他端部とは相互に嵌合されるものであり、この実施の形態では、前記円筒部２３の他端部が第３の排気管３４の下流端部に嵌合される。すなわち第３の排気管３４は、前記ミキサー１４側に向かうにつれて大径となるテーパ部３４ａと、そのテーパ部３４ａの大径端に同軸に連なる円筒状の接続筒部３４ｂとを有しており、第２の排気管３の下流端部である接続筒部３４ｂに前記円筒部２３の他端部が嵌合される。   The cylindrical casing 17 constituting the outline of the second catalytic converter 13 is formed so that one end portion of the cylindrical portion 23 of the mixer 14 is fitted into the upstream end portion of the casing 17. Further, the downstream end portion of the third exhaust pipe 34, which is a cylindrical member having a circular cross section so as to guide the exhaust gas to the mixer 14, and the other end portion of the cylindrical portion 23 are fitted to each other. In this embodiment, the other end portion of the cylindrical portion 23 is fitted to the downstream end portion of the third exhaust pipe 34. That is, the third exhaust pipe 34 has a tapered portion 34a having a diameter that increases toward the mixer 14, and a cylindrical connecting tube portion 34b that is coaxially connected to the large diameter end of the tapered portion 34a. The other end portion of the cylindrical portion 23 is fitted into the connecting tube portion 34b which is the downstream end portion of the second exhaust pipe 3.

しかも前記ケーシング１７の前記上流端部に、前記円筒部２３の前記一端部が前記排ガス通路３２の外側で溶接され、また前記円筒部２３の他端部が、前記第３の排気管３４の接続筒部３４ｂに前記排ガス通路３２の外側で溶接される。   Moreover, one end of the cylindrical portion 23 is welded to the upstream end of the casing 17 outside the exhaust gas passage 32, and the other end of the cylindrical portion 23 is connected to the third exhaust pipe 34. The tube 34b is welded outside the exhaust gas passage 32.

この第２の実施の形態によっても上記第１の実施の形態と同様の効果を奏することができる。   The same effect as that of the first embodiment can be obtained also by the second embodiment.

本発明の第３の実施の形態について図６を参照しながら説明するが、上記第１および第２の実施の形態に対応する部分には同一の参照符号を付して図示するのみとし、詳細な説明は省略する。   A third embodiment of the present invention will be described with reference to FIG. 6, but the parts corresponding to the first and second embodiments are only given the same reference numerals and shown in detail. The detailed explanation is omitted.

ミキサー１４には、第１の排気管２０、第２の排気管２１および第１の触媒コンバータ１２を介して排ガスが導かれるものであり、第１の排気管２０、第２の排気管２１、第１の触媒コンバータ１２およびミキサー１４でそれぞれ一部が形成される排ガス通路３６を流通する排ガスの流通方向３７に沿って第２の触媒コンバータ１３よりも上流側に前記ミキサー１４が配設される。   Exhaust gas is guided to the mixer 14 via the first exhaust pipe 20, the second exhaust pipe 21, and the first catalytic converter 12, and the first exhaust pipe 20, the second exhaust pipe 21, The mixer 14 is disposed upstream of the second catalytic converter 13 along the flow direction 37 of the exhaust gas flowing through the exhaust gas passage 36 partially formed by the first catalytic converter 12 and the mixer 14. .

第１の触媒コンバータ１２は、触媒を担持したハニカム構造のセラミックス３８が、円筒状のケーシング３９にマット４０を介して支持されて成り、排ガス中のＣＯおよびＨＣを酸化除去する働きをする。   The first catalytic converter 12 includes a honeycomb-structured ceramic 38 supporting a catalyst supported by a cylindrical casing 39 via a mat 40, and functions to oxidize and remove CO and HC in exhaust gas.

第２の触媒コンバータ１３の外郭を構成する円筒状の前記ケーシング１７は、該ケーシング１７の上流端部内に、前記ミキサー１４における円筒部２３の一端部を嵌合させるように形成される。また第１の触媒コンバータ１２のケーシング３９は、前記ミキサー１４に排ガスを導くようにして横断面形状を円形とした筒部材として形成されており、このケーシング３９の下流端部と、前記円筒部２３の他端部とは相互に嵌合されるものであり、この実施の形態では、前記ケーシング３９の下流端部前記円筒部２３の他端部に嵌合される。   The cylindrical casing 17 constituting the outline of the second catalytic converter 13 is formed so that one end portion of the cylindrical portion 23 of the mixer 14 is fitted into the upstream end portion of the casing 17. The casing 39 of the first catalytic converter 12 is formed as a cylindrical member having a circular cross section so as to guide the exhaust gas to the mixer 14, and the downstream end of the casing 39 and the cylindrical portion 23. The other end portions of the cylindrical portions 23 are fitted to each other. In this embodiment, the downstream end portion of the casing 39 is fitted to the other end portion of the cylindrical portion 23.

しかも前記ケーシング１７の前記上流端部に、前記円筒部２３の前記一端部が前記排ガス通路３６の外側で溶接され、また前記円筒部２３の他端部が、前記ケーシング３９の下流端部に前記排ガス通路３６の外側で溶接される。   In addition, one end of the cylindrical portion 23 is welded to the upstream end of the casing 17 outside the exhaust gas passage 36, and the other end of the cylindrical portion 23 is connected to the downstream end of the casing 39. Welding is performed outside the exhaust gas passage 36.

この第３の実施の形態によっても上記第１および第２の実施の形態と同様の効果を奏することができる。   The third embodiment can provide the same effects as those of the first and second embodiments.

以上、本発明の実施の形態について説明したが、本発明は上記実施の形態に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行うことが可能である。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

１３・・・触媒コンバータ
１４・・・ミキサー
１７・・・ケーシング
１９，３２，３６・・・排ガス通路
２１・・・筒部材である第２の排気管
２３・・・円筒部
２４・・・端板部
２５・・・開口部
２８，３３，３７・・・流通方向
３４・・・筒部材である第３の排気管
３９・・・筒部材であるケーシング DESCRIPTION OF SYMBOLS 13 ... Catalytic converter 14 ... Mixer 17 ... Casing 19, 32, 36 ... Exhaust gas passage 21 ... 2nd exhaust pipe 23 which is a cylindrical member ... Cylindrical part 24 ... End Plate part 25... Openings 28, 33, 37... Flow direction 34... Third exhaust pipe 39 that is a cylindrical member.

Claims (1)

排ガス通路（１９，３２，３６）内に供給された還元剤を排ガスと混合するミキサー（１４）が、排ガスの流通方向（２８，３３，３７）で触媒コンバータ（１３）よりも上流側に配設される排ガス浄化装置において、前記ミキサー（１４）が、前記排ガス通路（１９，３２，３６）の一部を形成する円筒部（２３）と、該円筒部（２３）の半径方向に沿って延びる複数のスリット状の開口部（２５）を有しつつ前記円筒部（２３）の一端部に外周が連設される端板部（２４）とを有して有底カップ状に形成され、前記触媒コンバータ（１３）の外郭を構成する円筒状のケーシング（１７）が、該ケーシング（１７）の上流端部内に前記円筒部（２３）の一端部を嵌合させるように形成され、排ガスを前記ミキサー（１４）に導くようにして横断面形状を円形とした筒部材（２１，３４，３９）の下流端部と、前記円筒部（２３）の他端部とが相互に嵌合され、前記ケーシング（１７）の前記上流端部および前記筒部材（２１，３４，３９）の下流端部に、前記円筒部（２３）の前記一端部および前記他端部が前記排ガス通路（１９，３２，３６）の外側で溶接されることを特徴とする排ガス浄化装置。   A mixer (14) for mixing the reducing agent supplied into the exhaust gas passages (19, 32, 36) with the exhaust gas is disposed upstream of the catalytic converter (13) in the exhaust gas flow direction (28, 33, 37). In the exhaust gas purification apparatus provided, the mixer (14) includes a cylindrical portion (23) that forms a part of the exhaust gas passage (19, 32, 36), and a radial direction of the cylindrical portion (23). It has a plurality of slit-shaped openings (25) extending, and has an end plate part (24) whose outer periphery is connected to one end part of the cylindrical part (23), and is formed in a bottomed cup shape, A cylindrical casing (17) constituting the outer shell of the catalytic converter (13) is formed so that one end portion of the cylindrical portion (23) is fitted into the upstream end portion of the casing (17), and exhaust gas is discharged. Lead to the mixer (14) The downstream end portion of the cylindrical member (21, 34, 39) having a circular cross-sectional shape and the other end portion of the cylindrical portion (23) are fitted to each other, and the upstream end portion of the casing (17) and That the one end part and the other end part of the cylindrical part (23) are welded to the downstream end part of the cylindrical member (21, 34, 39) outside the exhaust gas passage (19, 32, 36). A featured exhaust gas purification device.
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WO2008111254A1 (en) * 2007-03-12 2008-09-18 Bosch Corporation Exhaust gas purification apparatus for internal combustion engine
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