JP6120333B2 - Exhaust gas purification device - Google Patents

Exhaust gas purification device Download PDF

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JP6120333B2
JP6120333B2 JP2014101278A JP2014101278A JP6120333B2 JP 6120333 B2 JP6120333 B2 JP 6120333B2 JP 2014101278 A JP2014101278 A JP 2014101278A JP 2014101278 A JP2014101278 A JP 2014101278A JP 6120333 B2 JP6120333 B2 JP 6120333B2
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exhaust gas
reducing agent
wall portions
supply device
agent supply
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JP2015218615A (en
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佐藤　大輔
大輔 佐藤
学 赤羽
学 赤羽
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Yutaka Giken Co Ltd
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本発明は、還元剤供給装置から排ガス通路内に噴射された還元剤を排ガスと混合するミキサーが、触媒コンバータの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 purifying apparatus in which a mixer for mixing a reducing agent injected into an exhaust gas passage from a reducing agent supply device with exhaust gas is disposed upstream of a catalytic converter.

ＮＯX 触媒が充填された触媒コンバータの上流側に、排ガス通路に噴射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、たとえば特許文献１で知られている。 An exhaust gas purification apparatus in which a mixer for mixing a reducing agent such as urea water injected into an exhaust gas passage and exhaust gas is provided on the upstream side of a catalytic converter filled with a NO x catalyst is disclosed in, for example, Patent Literature Known as 1.

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、ミキサーが旋回流を得るように構成され、その旋回流で還元剤および排気の混合を促進するようにしており、ミキサーを通過する際の排ガスの流通抵抗すなわち排気抵抗が比較的大きくなってしまう。   However, in the one disclosed in Patent Document 1, the mixer is configured to obtain a swirling flow, and the swirling flow promotes the mixing of the reducing agent and the exhaust gas. Distribution resistance, that is, exhaust resistance becomes relatively large.

本発明は、かかる事情に鑑みてなされたものであり、ミキサーでの排気抵抗を比較的小さく抑えることを可能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 purifying apparatus capable of suppressing the exhaust resistance in a mixer to be relatively small.

上記目的を達成するために、本発明は、還元剤供給装置から排ガス通路内に噴射された還元剤を排ガスと混合するミキサーが、触媒コンバータの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、前記還元剤供給装置から噴射される還元剤がそれぞれ当てられるようにして前記排ガス通路内の排ガス流通方向に沿って平行に延びる複数個の壁部を備え、それらの壁部の表面積が、前記還元剤供給装置から遠くなるにつれて次第に大きくなるように形成されるとともに、それらの壁部の少なくとも中央部が、それらの壁部の延び方向から視た平面視で前記還元剤供給装置側に向かって突出した形状に形成されることを第１の特徴とする。 In order to achieve the above object, the present invention provides an exhaust gas purification apparatus in which a mixer for mixing the reducing agent injected into the exhaust gas passage from the reducing agent supply device with the exhaust gas is disposed upstream of the catalytic converter. The mixer includes a plurality of walls extending in parallel along the exhaust gas flow direction in the exhaust gas passage so that the reducing agent injected from the reducing agent supply device is applied thereto, and the surface area of the walls is The wall is formed so as to gradually increase as the distance from the reducing agent supply device increases, and at least the central portion of the wall portions is disposed on the reducing agent supply device side in a plan view as viewed from the extending direction of the wall portions. The first characteristic is that the shape protrudes toward the surface.

また本発明は、第１の特徴の構成に加えて、複数個の前記壁部が、それらの壁部の少なくとも中央部の前記排ガス流通方向に沿う長さが、前記還元剤供給装置から遠くなるにつれて次第に大きくなるように形成されることを第２の特徴とする。   In the present invention, in addition to the configuration of the first feature, the length of the plurality of wall portions along at least the central portion of the wall portions along the exhaust gas flow direction is far from the reducing agent supply device. The second feature is that it is formed so as to increase gradually as the time elapses.

本発明は、第１または第２の特徴の構成に加えて、前記ミキサーは、前記排ガス通路を形成するとともに前記還元剤供給装置が取付けられる筒体内に複数個の前記壁部が設けられて成り、前記筒体が、該筒体の上流側および下流側の排気管とは独立して形成されるとともに前記上流側および下流側の排気管に結合されることを第３の特徴とする。   According to the present invention, in addition to the configuration of the first or second feature, the mixer includes a plurality of the wall portions provided in a cylinder in which the exhaust gas passage is formed and the reducing agent supply device is attached. The third feature is that the cylindrical body is formed independently of the upstream and downstream exhaust pipes of the cylindrical body and is coupled to the upstream and downstream exhaust pipes.

なお実施の形態の二次触媒コンバータ１３が本発明の触媒コンバータに対応する。   The secondary catalytic converter 13 of the embodiment corresponds to the catalytic converter of the present invention.

本発明の第１の特徴によれば、還元剤供給装置から噴射される還元剤がそれぞれ当てられる複数個の壁部をミキサーが備えるので、各壁部から還元剤を反射、拡散させて排ガスとの混合を良好にすることができ、また各壁部が排ガス流通方向に沿って平行に延びるのでミキサーを通過する排ガスの流通抵抗を比較的低く抑えることが可能であり、しかも各壁部の表面積が還元剤供給装置から遠くなるにつれて次第に大きくなるように形成されるので還元剤供給装置から噴射される還元剤を確実に満遍なく壁部に当てるようにして排ガスとの混合効率を高めることができる。   According to the first feature of the present invention, since the mixer includes a plurality of wall portions to which the reducing agent injected from the reducing agent supply device is applied, the reducing agent is reflected and diffused from each wall portion, and the exhaust gas. In addition, since each wall portion extends in parallel along the exhaust gas flow direction, the flow resistance of the exhaust gas passing through the mixer can be kept relatively low, and the surface area of each wall portion can be kept low. Is formed so as to gradually increase as the distance from the reducing agent supply device increases, so that the reducing agent injected from the reducing agent supply device can be uniformly applied to the wall portion to increase the mixing efficiency with the exhaust gas.

また、複数個の壁部の少なくとも中央部が、排ガス流通方向に沿って延びるそれら壁部の延び方向から視た平面視で前記還元剤供給装置側に向かって突出しているので、還元剤供給装置から噴射されて壁部に当たった還元剤を排ガス流通方向ならびに還元剤噴射方向とほぼ直交する方向に拡散させることができ、排ガスとの混合がより効果的となる。 Further, since at least the central part of the plurality of wall portions protrudes toward the reducing agent supply device in a plan view as viewed from the extending direction of the wall portions extending along the exhaust gas circulation direction, the reducing agent supply device Can be diffused in a direction substantially orthogonal to the exhaust gas flow direction and the reducing agent injection direction, and mixing with the exhaust gas becomes more effective.

また本発明の第２の特徴によれば、複数個の壁部の少なくとも中央部の排ガス流通方向に沿う長さが、還元剤供給装置から遠くなるにつれて次第に大きくなるので、還元剤供給装置から噴射される還元剤を各壁部に満遍なく無駄なく当てることができる。   Further, according to the second feature of the present invention, the length along the exhaust gas flow direction of at least the central portion of the plurality of wall portions gradually increases as the distance from the reducing agent supply device increases. The reducing agent to be applied can be uniformly applied to each wall portion without waste.

さらに本発明の第３の特徴によれば、ミキサーの上流側および下流側の排気管と独立して形成されるとともにそれらの排気管に結合される筒体をミキサーが備え、その筒体内に複数個の壁部が設けられ、還元剤供給装置が筒体に取付けられるので、還元剤供給装置が取付けられた状態のミキサーを、排気管とは独立したユニットとして組み立てることができ、ミキサーおよび還元剤供給装置の排ガス浄化装置への組み付け作業性を良好なものとすることができる。   Furthermore, according to the third aspect of the present invention, the mixer includes a cylindrical body that is formed independently of the upstream and downstream exhaust pipes of the mixer and is coupled to the exhaust pipes. Since the wall portion is provided and the reducing agent supply device is attached to the cylindrical body, the mixer with the reducing agent supply device attached can be assembled as a unit independent of the exhaust pipe. Assembling workability of the supply device to the exhaust gas purification device can be improved.

第１の実施の形態の排ガス浄化装置の要部縦断平面図である。It is a principal part longitudinal section top view of the exhaust gas purification apparatus of a 1st embodiment. 図１の２−２線断面図である。FIG. 2 is a sectional view taken along line 2-2 of FIG. 第１の実施の形態の薄板リングおよび複数の壁部の斜視図である。It is a perspective view of a thin plate ring and a plurality of wall parts of a 1st embodiment. 第２の実施の形態の排ガス浄化装置の要部縦断平面図である。It is a principal part longitudinal cross-sectional view of the exhaust gas purification apparatus of 2nd Embodiment. 参考形態の排ガス浄化装置の要部縦断平面図である。It is a principal part longitudinal section top view of the exhaust gas purification apparatus of a reference form. 参考形態の薄板リングおよび複数の壁部の斜視図である。It is a perspective view of the thin plate ring of a reference form, and a plurality of wall parts.

以下、本発明の実施の形態および参考形態を、添付の図面を参照しながら説明する。   Embodiments and reference embodiments of the present invention will be described below 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３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の排ガス浄化装置１１Ａは、一次触媒コンバータ１２と、その一次触媒コンバータ１２よりも下流側に配置される二次触媒コンバータ１３と、一次および二次触媒コンバータ１３間に介設されるミキサー１４Ａと、該ミキサー１４Ａ内に還元剤ｒたとえば尿素水を噴射する還元剤供給装置１５とを備える。   A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, in FIG. 1, an exhaust gas purification device 11 </ b> A of a diesel engine E includes a primary catalytic converter 12 and a primary catalytic converter 12. A secondary catalytic converter 13 disposed on the downstream side, a mixer 14A interposed between the primary and secondary catalytic converters 13, and a reducing agent supply device 15 for injecting a reducing agent r such as urea water into the mixer 14A. Is provided.

前記一次触媒コンバータ１２は、通過する排ガスｇ中のＣＯおよびＨＣを酸化除去する。また二次触媒コンバータ１３は、触媒を担持したハニカム構造のセラミックス１６が、保持筒１７にマット１８を介して支持されて成り、通過する排ガスｇ中のＮＯX を還元除去する。 The primary catalytic converter 12 oxidizes and removes CO and HC in the passing exhaust gas g. Further, the secondary catalytic converter 13 is formed by supporting the ceramics 16 having a honeycomb structure carrying a catalyst with a holding cylinder 17 via a mat 18 and reducing and removing NO x in the passing exhaust gas g.

前記ミキサー１４Ａは、前記還元剤供給装置１５から噴射される還元剤ｒを排ガス通路１９内で排ガスｇと混合して前記二次触媒コンバータ１３側に導くものであり、前記一次触媒コンバータ１２から導出された排ガスｇを導く排気管２０と、前記二次触媒コンバータ１３との間に介設されており、前記還元剤供給装置１５から噴射される還元剤ｒがそれぞれ当てられるようにして前記排ガス通路１９内の排ガス流通方向２１に沿って平行に延びる複数個たとえば第１〜第５の壁部２２，２３，２４，２５，２６を備える。   The mixer 14A mixes the reducing agent r injected from the reducing agent supply device 15 with the exhaust gas g in the exhaust gas passage 19 and guides it to the secondary catalytic converter 13 side, and is derived from the primary catalytic converter 12. The exhaust gas passage 20 is interposed between the exhaust pipe 20 for guiding the exhaust gas g and the secondary catalytic converter 13 so that the reducing agent r injected from the reducing agent supply device 15 is applied to the exhaust gas passage. A plurality of, for example, first to fifth wall portions 22, 23, 24, 25, and 26 that extend in parallel along the exhaust gas flow direction 21 in 19 are provided.

前記ミキサー１４Ａは、前記排ガス通路１９を形成するとともに前記還元剤供給装置１５が取付けられる筒体２７内に、複数個の壁部が設けられて成るものであり、この第１の実施の形態では、還元剤供給装置１５に近い側から順に番号を付した第１〜第５の壁部２２，２３，２４，２５，２６が前記筒体２７内に設けられて成る。第１〜第５の壁部２２〜２６の両端は、前記筒体２７の内周に嵌合、固着される薄板リング２８に、たとえば溶接によって固着される。   The mixer 14A is provided with a plurality of wall portions in a cylindrical body 27 in which the exhaust gas passage 19 is formed and the reducing agent supply device 15 is attached. In the first embodiment, The first to fifth wall portions 22, 23, 24, 25, and 26, which are numbered in order from the side closer to the reducing agent supply device 15, are provided in the cylindrical body 27. Both ends of the first to fifth wall portions 22 to 26 are fixed to the thin plate ring 28 fitted and fixed to the inner periphery of the cylindrical body 27 by, for example, welding.

前記筒体２７の両端は、前記排気管２０と、前記二次触媒コンバータ１３の前記保持筒１７の上流端に一体に形成される排気管１７ａとに溶接によって結合されており、前記排気管２０，１７ａとは別体に形成される。また前記還元剤供給装置１５は、前記薄板リング２８が固着される部位よりも前記排ガス流通方向２１に沿う上流側で前記筒体２７の外面に取付けられるものであり、この還元剤供給装置１５の前記筒体２７への取付け姿勢は、該還元剤供給装置１５から噴射される前記還元剤ｒが、より満遍なく第１〜第５の壁部２２〜２６に当たるように設定される。   Both ends of the cylindrical body 27 are joined by welding to the exhaust pipe 20 and an exhaust pipe 17a formed integrally with the upstream end of the holding cylinder 17 of the secondary catalytic converter 13, and the exhaust pipe 20 , 17a are formed separately. The reducing agent supply device 15 is attached to the outer surface of the cylindrical body 27 on the upstream side along the exhaust gas flow direction 21 with respect to the portion where the thin plate ring 28 is fixed. The mounting posture to the cylindrical body 27 is set so that the reducing agent r injected from the reducing agent supply device 15 more uniformly hits the first to fifth wall portions 22 to 26.

しかも第１〜第５の壁部２２〜２６の表面積は、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成される。このため第１〜第５の壁部２２〜２６が、それらの壁部２２〜２６の少なくとも中央部の前記排ガス流通方向２１に沿う長さが、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成されており、この実施の形態では、前記薄板リング２８から前記排ガス流通方向２１に沿う上流側に第１〜第５の壁部２２〜２６が突出するとともに第１〜第５の壁部２２〜２６の中央部２２ａ，２３ａ，２４ａ，２５ａ，２６ａの前記薄板リング２８からの前記排ガス流通方向２１に沿う上流側への突出量が、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成される。   Moreover, the surface areas of the first to fifth wall portions 22 to 26 are formed so as to gradually increase as the distance from the reducing agent supply device 15 increases. Therefore, the lengths of the first to fifth wall portions 22 to 26 along the exhaust gas flow direction 21 of at least the central portion of the wall portions 22 to 26 gradually increase as the distance from the reducing agent supply device 15 increases. In this embodiment, the first to fifth wall portions 22 to 26 project from the thin plate ring 28 to the upstream side along the exhaust gas flow direction 21 and the first to fifth walls. The amount of protrusion of the central portions 22a, 23a, 24a, 25a, and 26a of the wall portions 22 to 26 from the thin plate ring 28 toward the upstream side along the exhaust gas flow direction 21 gradually increases as the distance from the reducing agent supply device 15 increases. It is formed to be large.

さらに第１〜第５の壁部２２〜２６の少なくとも中央部、この第１の実施の形態では中央部２２ａ〜２６ａが、前記排ガス流通方向２１に沿って延びる前記第１〜第５の壁部２２〜２６の延び方向から視た平面視で、前記還元剤供給装置１５側に向かって、たとえば三角形状に突出した形状に形成される。 Furthermore, at least the central portion of the first to fifth wall portions 22 to 26, in this first embodiment, the central portions 22 a to 26 a extend along the exhaust gas flow direction 21. For example, it is formed in a shape protruding in a triangular shape toward the reducing agent supply device 15 in a plan view as viewed from the extending direction of 22 to 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１４Ａが、還元剤供給装置１５から噴射される還元剤ｒがそれぞれ当てられる第１〜第５の壁部２２〜２６を備えるので、第１〜第５の壁部２２〜２６から還元剤ｒを反射、拡散させて排ガスｇとの混合を良好にすることができる。また第１〜第５の壁部２２〜２６が排ガス流通方向２１に沿って平行に延びるのでミキサー１４Ａを通過する排ガスｇの流通抵抗を比較的低く抑えることが可能であり、しかも第１〜第５の壁部２２〜２６の表面積が前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成されるので前記還元剤供給装置１５から噴射される還元剤ｒを確実に満遍なく第１〜第５の壁部２２〜２６に当てるようにして排ガスｇとの混合効率を高めることができる。   Next, the operation of the first embodiment will be described. Since the mixer 14A includes first to fifth wall portions 22 to 26 to which the reducing agent r injected from the reducing agent supply device 15 is applied, respectively. The reducing agent r can be reflected and diffused from the first to fifth wall portions 22 to 26 to improve the mixing with the exhaust gas g. Further, since the first to fifth wall portions 22 to 26 extend in parallel along the exhaust gas flow direction 21, the flow resistance of the exhaust gas g passing through the mixer 14A can be kept relatively low. 5 is formed such that the surface area of the wall portions 22 to 26 gradually increases as the distance from the reducing agent supply device 15 increases, so that the reducing agent r injected from the reducing agent supply device 15 is surely uniformly distributed from the first to the first. The efficiency of mixing with the exhaust gas g can be increased by being applied to the wall portions 22 to 26 of No. 5.

また第１〜第５の壁部２２〜２６が、それらの壁部２２〜２６の少なくとも中央部２２ａ〜２６ａの前記排ガス流通方向２１に沿う長さが、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成されるので、前記還元剤供給装置１５から噴射される還元剤ｒを各壁部２２〜２６に満遍なく無駄なく当てることができる。   Further, the lengths of the first to fifth wall portions 22 to 26 along the exhaust gas flow direction 21 of at least the center portions 22 a to 26 a of the wall portions 22 to 26 are farther from the reducing agent supply device 15. Since it is formed so as to gradually increase, the reducing agent r injected from the reducing agent supply device 15 can be uniformly applied to the walls 22 to 26 without waste.

また第１〜第５の壁部２２〜２６の少なくとも中央部２２ａ〜２６ａが、前記第１〜第５の壁部２２〜２６の前記延び方向から視た平面視で前記還元剤供給装置１５側に向かって突出した形状に形成されるので、前記還元剤供給装置１５から噴射されて第１〜第５の壁部２２〜２６に当たった還元剤ｒを排ガス流通方向２１ならびに還元剤噴射方向とほぼ直交する方向に拡散させることができ、排ガスｇとの混合がより効果的となる。 Further, at least the central portions 22a to 26a of the first to fifth wall portions 22 to 26 are on the reducing agent supply device 15 side in a plan view as viewed from the extending direction of the first to fifth wall portions 22 to 26. The reducing agent r injected from the reducing agent supply device 15 and hitting the first to fifth wall portions 22 to 26 is changed into the exhaust gas flow direction 21 and the reducing agent injection direction. It can be diffused in a substantially orthogonal direction, and mixing with the exhaust gas g becomes more effective.

さらに前記ミキサー１４Ａは、排ガス通路１９を形成するとともに前記還元剤供給装置１５が取付けられる筒体２７内に第１〜第５の壁部２２〜２６が設けられて成り、前記筒体２７が、該筒体２７の上流側および下流側の排気管２０，１７ａとは独立して形成されるとともに前記上流側および下流側の排気管２０，１７ａに結合されるので、還元剤供給装置１５が取付けられた状態のミキサー１４Ａを、排気管２０，１７ａとは独立したユニットとして組み立てることができ、ミキサー１４Ａおよび還元剤供給装置１５の排ガス浄化装置への組み付け作業性を良好なものとすることができる。   Furthermore, the mixer 14A includes an exhaust gas passage 19 and first to fifth wall portions 22 to 26 provided in a cylinder 27 to which the reducing agent supply device 15 is attached. Since the upstream and downstream exhaust pipes 20 and 17a of the cylindrical body 27 are formed independently and coupled to the upstream and downstream exhaust pipes 20 and 17a, the reducing agent supply device 15 is attached. The mixer 14A in the state thus obtained can be assembled as a unit independent of the exhaust pipes 20 and 17a, and the workability of assembling the mixer 14A and the reducing agent supply device 15 to the exhaust gas purification device can be improved. .

図４は本発明の第２の実施の形態を示すものであり、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。   FIG. 4 shows a second embodiment of the present invention. The parts corresponding to those of the first embodiment are indicated by the same reference numerals, and the detailed description is omitted. .

排ガス浄化装置１１Ｂにおいて一次触媒コンバータ１２および二次触媒コンバータ１３間に介設されるミキサー１４Ｂは、排ガス通路１９を形成するとともに還元剤供給装置１５が取付けられる筒体２７内に、第１〜第５の壁部２２，２３，２４，２５，２６が設けられて成り、第１〜第５の壁部２２〜２６の両端は、前記筒体２７の内周に嵌合、固着される薄板リング２８に、たとえば溶接によって固着される。   The mixer 14B interposed between the primary catalytic converter 12 and the secondary catalytic converter 13 in the exhaust gas purification device 11B forms the exhaust gas passage 19 and the first to first in the cylindrical body 27 to which the reducing agent supply device 15 is attached. 5 wall portions 22, 23, 24, 25, and 26, and both ends of the first to fifth wall portions 22 to 26 are fitted and fixed to the inner periphery of the cylindrical body 27. For example, it is fixed to 28 by welding.

前記還元剤供給装置１５は、前記薄板リング２８が固着される部位よりも前記排ガス流通方向２１に沿う下流側で前記筒体２７の外面に取付けられ、第１〜第５の壁部２２〜２６は、それらの壁部２２〜２６の少なくとも中央部の前記排ガス流通方向２１に沿う長さが、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成されており、前記薄板リング２８から前記排ガス流通方向２１に沿う下流側に第１〜第５の壁部２２〜２６が突出するとともに第１〜第５の壁部２２〜２６の中央部２２ａ，２３ａ，２４ａ，２５ａ，２６ａの前記薄板リング２８からの前記排ガス流通方向２１に沿う下流側への突出量が、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成される。また第１〜第５の壁部２２〜２６の中央部２２ａ〜２６ａは、前記排ガス流通方向２１に沿って延びる前記第１〜第５の壁部２２〜２６の延び方向から視た平面視で、前記還元剤供給装置１５側に向かって、たとえば三角形状に突出した形状に形成される。 The reducing agent supply device 15 is attached to the outer surface of the cylindrical body 27 on the downstream side along the exhaust gas flow direction 21 with respect to the portion where the thin plate ring 28 is fixed, and the first to fifth wall portions 22 to 26. Is formed such that the length along the exhaust gas flow direction 21 of at least the central portion of the wall portions 22 to 26 gradually increases as the distance from the reducing agent supply device 15 increases. The first to fifth wall portions 22 to 26 project on the downstream side along the exhaust gas circulation direction 21 and the center portions 22a, 23a, 24a, 25a, and 26a of the first to fifth wall portions 22 to 26 are disposed. The amount of protrusion from the thin plate ring 28 toward the downstream side along the exhaust gas flow direction 21 is formed so as to gradually increase as the distance from the reducing agent supply device 15 increases. Further, the central portions 22a to 26a of the first to fifth wall portions 22 to 26 are viewed in a plan view as viewed from the extending direction of the first to fifth wall portions 22 to 26 extending along the exhaust gas circulation direction 21. For example, it is formed in a shape protruding in a triangular shape toward the reducing agent supply device 15 side.

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.

図５および図６は本発明の参考形態を示すものであり、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。   FIG. 5 and FIG. 6 show a reference form of the present invention. The parts corresponding to the first and second embodiments are only given the same reference numerals, and the detailed explanation is as follows. Omitted.

排ガス浄化装置１１Ｃにおいて一次触媒コンバータ１２および二次触媒コンバータ１３間に介設されるミキサー１４Ｃは、排ガス通路１９を形成するとともに還元剤供給装置１５が取付けられる筒体２７内に、平板状である第１〜第５の壁部３２，３３，３４，３５，３６が設けられて成り、第１〜第５の壁部３２〜３６の両端は、前記筒体２７の内周に嵌合、固着される薄板リング２８に、たとえば溶接によって固着される。   The mixer 14C interposed between the primary catalytic converter 12 and the secondary catalytic converter 13 in the exhaust gas purifying device 11C has a flat plate shape in the cylindrical body 27 in which the exhaust gas passage 19 is formed and the reducing agent supply device 15 is attached. The first to fifth wall portions 32, 33, 34, 35, and 36 are provided, and both ends of the first to fifth wall portions 32 to 36 are fitted and fixed to the inner periphery of the cylindrical body 27. The thin plate ring 28 is fixed by, for example, welding.

前記還元剤供給装置１５は、前記薄板リング２８が固着される部位よりも前記排ガス流通方向２１に沿う下流側で前記筒体２７の外面に取付けられ、第１〜第５の壁部３２〜３６は、それらの壁部３２〜３６の少なくとも中央部の前記排ガス流通方向２１に沿う長さが、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成されており、前記薄板リング２８から前記排ガス流通方向２１に沿う下流側に第１〜第５の壁部３２〜３６が突出するとともに第１〜第５の壁部３２〜３６の中央部３２ａ，３３ａ，３４ａ，３５ａ，３６ａの前記薄板リング２８からの前記排ガス流通方向２１に沿う下流側への突出量が、前記還元剤供給装置１５から遠くなるにつれて次第に大きくなるように形成されており、第１の壁部３２の前記排ガス流通方向２１に沿う下流側の端壁はその中央部３２ａを含んで平坦に形成されるが、第２〜第５の壁部３３〜３６の中央部３３ａ〜３６ａは段差状に突出するように形成される。   The reducing agent supply device 15 is attached to the outer surface of the cylindrical body 27 on the downstream side along the exhaust gas flow direction 21 with respect to the portion to which the thin plate ring 28 is fixed, and the first to fifth wall portions 32 to 36. Is formed such that the length along the exhaust gas flow direction 21 of at least the central portion of the wall portions 32 to 36 gradually increases as the distance from the reducing agent supply device 15 increases. The first to fifth wall portions 32 to 36 protrude to the downstream side along the exhaust gas circulation direction 21 and the central portions 32a, 33a, 34a, 35a, 36a of the first to fifth wall portions 32 to 36 are described above. The amount of protrusion from the thin plate ring 28 toward the downstream side along the exhaust gas flow direction 21 is formed so as to gradually increase as the distance from the reducing agent supply device 15 increases. The downstream end wall along the exhaust gas flow direction 21 is formed flat including the central portion 32a, but the central portions 33a to 36a of the second to fifth wall portions 33 to 36 protrude in a stepped shape. Formed as follows.

この参考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。   Also according to this reference embodiment, the same effects as those of the first and second embodiments can be obtained.

以上、本発明の実施の形態および参考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 embodiment and the reference embodiment of the present invention have been described above, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the present invention described in the claims. Can be done.

たとえば上述の実施の形態では壁部２２〜２６，３２〜３６が薄板リング２８に溶接によって固着されるようにしたが、円形の平板から複数の壁部を切り起こして形成することも可能である。   For example, in the above-described embodiment, the wall portions 22 to 26 and 32 to 36 are fixed to the thin plate ring 28 by welding, but it is also possible to cut and raise a plurality of wall portions from a circular flat plate. .

１４Ａ，１４Ｂ・・・ミキサー
１５・・・還元剤供給装置
１７，２０・・・排気管
１９・・・排ガス通路
２１・・・排ガス流通方向
２２，２３，２４，２５，２６・・・壁部
２２ａ，２３ａ，２４ａ，２５ａ，２６ａ・・・壁部の中央部
２７・・・筒体
ｇ・・・排ガス
ｒ・・・還元剤
14A, 14B ... mixer 15 ... reducing agent supply device 17, 20 ... exhaust pipe 19 ... exhaust gas passage 21 ... exhaust gas circulation direction 22, 23, 24, 25, 26 ... wall part 22a, 23a, 24a, 25a, 26a ... central part 27 of the wall part ... cylindrical body g ... exhaust gas r ... reducing agent

Claims (3)

還元剤供給装置（１５）から排ガス通路（１９）内に噴射された還元剤（ｒ）を排ガス（ｇ）と混合するミキサー（１４Ａ，１４Ｂ）が、触媒コンバータ（１３）の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（１４Ａ，１４Ｂ）が、前記還元剤供給装置（１５）から噴射される還元剤（ｒ）がそれぞれ当てられるようにして前記排ガス通路（１９）内の排ガス流通方向（２１）に沿って平行に延びる複数個の壁部（２２，２３，２４，２５，２６）を備え、それらの壁部（２２〜２６）の表面積が、前記還元剤供給装置（１５）から遠くなるにつれて次第に大きくなるように形成されるとともに、それらの壁部（２２〜２６）の少なくとも中央部（２２ａ，２３ａ，２４ａ，２５ａ，２６ａ）が、それらの壁部（２２〜２６）の延び方向から視た平面視で前記還元剤供給装置（１５）側に向かって突出した形状に形成されることを特徴とする排ガス浄化装置。 A mixer (14A, 14B) for mixing the reducing agent (r) injected into the exhaust gas passage (19) from the reducing agent supply device (15) with the exhaust gas (g) is disposed upstream of the catalytic converter (13). In the exhaust gas purification device to be
The mixers (14A, 14B) are respectively applied with the reducing agent (r) injected from the reducing agent supply device (15) along the exhaust gas flow direction (21) in the exhaust gas passage (19). A plurality of wall portions (22, 23, 24, 25, 26) extending in parallel are provided, and the surface areas of these wall portions (22-26) gradually increase as the distance from the reducing agent supply device (15) increases. And at least the central portion (22a, 23a, 24a, 25a, 26a) of the wall portions (22 to 26) is a plan view as viewed from the extending direction of the wall portions (22 to 26). The exhaust gas purifying device is formed in a shape protruding toward the reducing agent supply device (15). 複数個の前記壁部（２２〜２６）が、それらの壁部（２２〜２６）の少なくとも中央部（２２ａ，２３ａ，２４ａ，２５ａ，２６ａ）の前記排ガス流通方向（２１）に沿う長さが、前記還元剤供給装置（１５）から遠くなるにつれて次第に大きくなるように形成されることを特徴とする請求項１に記載の排ガス浄化装置。   A plurality of the wall portions (22-26) have a length along the exhaust gas flow direction (21) of at least the central portions (22a, 23a, 24a, 25a, 26a) of the wall portions (22-26). The exhaust gas purifying device according to claim 1, wherein the exhaust gas purifying device is formed so as to gradually increase as the distance from the reducing agent supply device (15) increases. 前記ミキサー（１４Ａ，１４Ｂ）は、前記排ガス通路（１９）を形成するとともに前記還元剤供給装置（１５）が取付けられる筒体（２７）内に複数個の前記壁部（２２〜２６）が設けられて成り、前記筒体（２７）が、該筒体（２７）の上流側および下流側の排気管（２０，１７ａ）とは独立して形成されるとともに前記上流側および下流側の排気管（２０，１７ａ）に結合されることを特徴とする請求項１または２に記載の排ガス浄化装置。   The mixers (14A, 14B) are provided with a plurality of wall portions (22-26) in a cylinder (27) in which the exhaust gas passage (19) is formed and the reducing agent supply device (15) is attached. Thus, the cylindrical body (27) is formed independently of the upstream and downstream exhaust pipes (20, 17a) of the cylindrical body (27), and the upstream and downstream exhaust pipes are formed. The exhaust gas purification device according to claim 1 or 2, wherein the exhaust gas purification device is coupled to (20, 17a).
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