JP4893454B2 - Dispersion plate - Google Patents

Dispersion plate Download PDF

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JP4893454B2
JP4893454B2 JP2007119608A JP2007119608A JP4893454B2 JP 4893454 B2 JP4893454 B2 JP 4893454B2 JP 2007119608 A JP2007119608 A JP 2007119608A JP 2007119608 A JP2007119608 A JP 2007119608A JP 4893454 B2 JP4893454 B2 JP 4893454B2
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reducing agent
dispersion plate
exhaust passage
exhaust
supply device
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JP2008274852A (en
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和浩 伊藤
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Toyota Motor Corp
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Description

本発明は、分散板に関する。   The present invention relates to a dispersion plate.

触媒上流の排気通路内に還元剤供給装置を配置し、触媒において、還元剤供給装置から供給された還元剤と排気とを反応させ、排気浄化をするようにした内燃機関の排気浄化装置では、触媒における還元剤のすり抜けを防止し、還元剤を有効に利用するために、還元剤を排気ガスと十分混合し、また、還元剤を排気通路の断面全体にわたって広く分散させることが好ましい。   In the exhaust gas purification apparatus for an internal combustion engine in which the reducing agent supply device is disposed in the exhaust passage upstream of the catalyst, and the exhaust gas is purified by reacting the reducing agent supplied from the reducing agent supply device with the exhaust gas in the catalyst. In order to prevent slipping of the reducing agent in the catalyst and to effectively use the reducing agent, it is preferable that the reducing agent is sufficiently mixed with the exhaust gas and that the reducing agent is widely dispersed over the entire cross section of the exhaust passage.

還元剤供給装置から触媒までの排気通路空間が大きければ、還元剤は十分混合され、広く分散させることが可能であるが、車両構造による制限のため、還元剤供給装置から触媒までの排気通路空間を大きくすることができない。そこで、従来より、図２に示すように、還元剤供給装置の下流であって、触媒に対して上流側に、還元剤を排気ガスと混合し、還元剤を排気通路の断面全体にわたって広く分散させるために、分散板が備えられている。この分散板と略同様の作用効果を得ることを目的とする要素が、特許文献１、特許文献２、特許文献３に、それぞれ整流格子、ミキサー、混合器として紹介されている。   If the exhaust passage space from the reducing agent supply device to the catalyst is large, the reducing agent can be sufficiently mixed and widely dispersed. However, due to restrictions on the vehicle structure, the exhaust passage space from the reducing agent supply device to the catalyst Cannot be increased. Therefore, conventionally, as shown in FIG. 2, the reducing agent is mixed with the exhaust gas downstream of the reducing agent supply device and upstream of the catalyst, and the reducing agent is widely dispersed over the entire cross section of the exhaust passage. For this purpose, a dispersion plate is provided. Elements aiming to obtain substantially the same effect as this dispersion plate are introduced in Patent Document 1, Patent Document 2, and Patent Document 3 as a rectifying grid, a mixer, and a mixer, respectively.

特開２００５−２１４１００号公報JP-A-2005-214100 特表２００１−５１６６３５号公報Special table 2001-516635 gazette 特表２００３−５０３１７２号公報Special table 2003-503172

図２の分散板や、特許文献１、特許文献２、特許文献３の整流格子、ミキサー、混合器では、特許文献１に示されるような排気通路の曲がり部に還元剤供給装置を配置し、還元剤を整流格子の入口断面に対して略垂直な方向から噴射し、整流格子の入口断面において略均一に広がるように噴射する場合には、還元剤と排気ガスとの混合が良好に行われ、混合流れを略均一に触媒に導くことができる。しかし、上述の浄化装置と他の浄化装置とを併用する等の、浄化装置の改良に伴う構造上の変化により、還元剤供給装置を排気通路の曲がり部に配置することが困難となっている。   In the dispersion plate of FIG. 2, the rectifying grid, the mixer, and the mixer of Patent Document 1, Patent Document 2, and Patent Document 3, a reducing agent supply device is disposed at the bent portion of the exhaust passage as shown in Patent Document 1, When the reducing agent is injected from a direction substantially perpendicular to the inlet cross section of the rectifying grid and is injected so as to spread substantially uniformly in the inlet cross section of the rectifying grid, the reducing agent and the exhaust gas are mixed well. The mixed flow can be led to the catalyst substantially uniformly. However, it is difficult to arrange the reducing agent supply device at the bent portion of the exhaust passage due to structural changes accompanying improvement of the purification device, such as the combined use of the above purification device and another purification device. .

そこで、図２に示すように、還元剤供給装置を排気通路の直管部に配置し、還元剤を斜めの方向から噴射することが行われるが、この場合には、排気通路の上部と下部との間に混合流れの不均一を生じる。混合流れの不均一に対する対策としては、分散板に多数のフィンを取り付け、混合流れを強制的に分散させる方法等が存在するが、分散板の形状が複雑となり、生産性が悪く、耐久性に欠け、圧力損失が大きい等の問題を有する。   Therefore, as shown in FIG. 2, the reducing agent supply device is disposed in the straight pipe portion of the exhaust passage, and the reducing agent is injected from an oblique direction. In this case, the upper and lower portions of the exhaust passage are arranged. A non-uniform mixing flow. As a countermeasure against uneven mixing flow, there are methods such as attaching a large number of fins to the dispersion plate to forcibly disperse the mixing flow, but the shape of the dispersion plate is complicated, resulting in poor productivity and durability. There are problems such as chipping and large pressure loss.

本発明は、還元剤供給装置を排気通路の直管部に配置し、還元剤を斜めの方向から噴射する場合において、還元剤と排気ガスとの良好な混合を行なうことができ、触媒に対して略均一な混合流れを供給することができる、形状が簡単で、生産性が高く、耐久性を有し、圧力損失が小さい分散板を提供することを目的としている。   In the present invention, when the reducing agent supply device is arranged in the straight pipe portion of the exhaust passage and the reducing agent is injected from an oblique direction, the reducing agent and the exhaust gas can be mixed well, It is an object of the present invention to provide a dispersion plate that can supply a substantially uniform mixed flow, has a simple shape, high productivity, durability, and low pressure loss.

請求項１に記載の発明によれば、触媒上流の排気通路直管部に還元剤供給装置を配置し、排気通路に対して斜めの方向から還元剤を噴射し、触媒において、還元剤供給装置から供給された還元剤と排気とを反応させ、排気浄化をするようにした内燃機関の排気浄化装置において、前記還元剤供給装置の下流であって、前記触媒に対して上流側に、前記還元剤と排気とを混合し、還元剤を排気通路の断面全体にわたって広く分散させる分散板を備え、前記分散板が、前記排気通路軸方向に対して平行に配置された複数の平板によって構成され、前記分散板の複数の平板の、還元剤及び排気が流入する入口部の配置形状が、排気通路軸方向断面において略直線を形成し、前記直線の、前記還元剤供給装置の噴射軸線方向に対する角度が、略直角であり、前記複数の平板の、還元剤及び排気が流入する入口部の配置形状の、前記排気通路軸方向上流から見た端縁部が、前記排気通路軸方向に対して略垂直方向に略直線状に延び、前記直線が、前記還元剤供給装置の噴射軸線方向に対して、略直角となるように配置され、前記還元剤が、前記入口部で前記分散板の複数の平板に略均等に噴射され、前記複数の平板に流入することを特徴とする、分散板が提供される。 According to the first aspect of the present invention, the reducing agent supply device is disposed in the exhaust pipe straight pipe portion upstream of the catalyst, and the reducing agent is injected from an oblique direction with respect to the exhaust passage. In the exhaust gas purification apparatus for an internal combustion engine, the exhaust gas is made to react with the reducing agent supplied from the exhaust gas, and the reduction is performed downstream of the reducing agent supply apparatus and upstream of the catalyst. A dispersion plate that mixes the agent and the exhaust and disperses the reducing agent widely over the entire cross section of the exhaust passage, and the dispersion plate is constituted by a plurality of flat plates arranged in parallel to the axial direction of the exhaust passage, The arrangement shape of the inlet portions into which the reducing agent and the exhaust flow of the plurality of flat plates of the dispersion plate forms a substantially straight line in the cross section in the exhaust passage axial direction, and the angle of the straight line with respect to the injection axis direction of the reducing agent supply device But at a right angle Ri, wherein the plurality of flat plates, the arrangement shape of the inlet portion of the reducing agent and the exhaust flows, edge as viewed from the exhaust passage axial direction upstream, substantially linear in a direction substantially perpendicular to the exhaust passage axial direction And the straight line is arranged so as to be substantially perpendicular to the injection axis direction of the reducing agent supply device, and the reducing agent is substantially evenly distributed on the plurality of flat plates of the dispersion plate at the inlet portion. is injected, it characterized that you flowing said a plurality of flat plates, the dispersion plate is provided.

すなわち、請求項１の発明では、噴射された還元剤の、分散板までの到達距離を略等しくし、蒸発時間を略等しくすることができるため、還元剤と排気ガスの良好な混合を行なうことができ、また、混合流れを排気通路全体に分散させることができるため、触媒に対して略均一な混合流れを供給することができる。更に、排気通路管壁へ付着する還元剤の量も減少させることができ、従来と同一の還元剤添加量で比較した場合には、浄化性能が向上する。従って、還元剤と排気ガスの良好な混合を行なうことができ、触媒に対して略均一な混合流れを供給することができる、形状が簡単で、生産性が高く、耐久性を有し、圧力損失が小さい分散板を提供するという目的を達成することができる。また、分散板を、排気通路軸方向に対して平行な複数の平板によって構成し、上述のように配置することにより、還元剤を、分散板の各平板に略均等に噴射することができるため、還元剤と排気ガスの良好な混合を行なうことができ、触媒に対して略均一な混合流れを供給することができる。更に、本発明の分散板では、還元剤が、入口部で分散板の複数の平板に略均等に噴射され、複数の平板に流入するように配置されているので、この分散板は、形状が簡単で、生産性が高く、耐久性を有し、圧力損失が小さい分散板を提供するという目的を達成することができる。 That is, according to the first aspect of the present invention, since the reach of the injected reducing agent to the dispersion plate can be made substantially equal and the evaporation time can be made substantially equal, the reducing agent and the exhaust gas can be mixed well. In addition, since the mixed flow can be dispersed throughout the exhaust passage, a substantially uniform mixed flow can be supplied to the catalyst. Furthermore, the amount of reducing agent adhering to the exhaust passage tube wall can be reduced, and the purification performance is improved when compared with the same amount of reducing agent added as before. Therefore, good mixing of the reducing agent and the exhaust gas can be performed, a substantially uniform mixed flow can be supplied to the catalyst, the shape is simple, the productivity is high, the durability is high, and the pressure The object of providing a dispersion plate with low loss can be achieved. In addition, since the dispersion plate is constituted by a plurality of flat plates parallel to the exhaust passage axial direction and arranged as described above, the reducing agent can be injected substantially uniformly onto each flat plate of the dispersion plate. Thus, good mixing of the reducing agent and the exhaust gas can be performed, and a substantially uniform mixed flow can be supplied to the catalyst. Furthermore, in the dispersion plate of the present invention, the reducing agent is arranged so that the reducing agent is injected almost uniformly onto the plurality of flat plates of the dispersion plate at the inlet and flows into the plurality of flat plates. The object of providing a dispersion plate that is simple, highly productive, durable, and has low pressure loss can be achieved.

請求項２に記載の発明によれば、触媒上流の排気通路直管部に還元剤供給装置を配置し、排気通路に対して斜めの方向から還元剤を噴射し、触媒において、還元剤供給装置から供給された還元剤と排気とを反応させ、排気浄化をするようにした内燃機関の排気浄化装置において、前記還元剤供給装置の下流であって、前記触媒に対して上流側に、前記還元剤と排気とを混合し、還元剤を排気通路の断面全体にわたって広く分散させる分散板を備え、前記分散板が、前記排気通路軸方向に対して平行に配置された複数の平板によって構成され、前記分散板の複数の平板の、還元剤及び排気が流入する入口部の配置形状が、排気通路軸方向断面において略直線を形成し、前記直線の、前記還元剤供給装置の噴射軸線方向に対する角度が、略直角であり、前記複数の平板の、還元剤及び排気が流入する入口部の配置形状の、前記排気通路軸方向上流から見た端縁部が、前記排気通路軸方向に対して略垂直方向に略直線状に延び、前記直線が、前記還元剤供給装置の噴射軸線方向に対して、略直角となるように配置され、前記還元剤が、前記入口部で前記分散板の複数の平板に略均等に噴射され、前記複数の平板に流入し、更に、前記分散板の、分散板入口部から分散板出口部までの軸方向長さが、排気通路軸方向断面における上部から下部にわたって略同一であることを特徴とする、分散板が提供される。 According to the second aspect of the present invention, the reducing agent supply device is disposed in the exhaust pipe straight pipe portion upstream of the catalyst, and the reducing agent is injected from an oblique direction with respect to the exhaust passage. In the exhaust gas purification apparatus for an internal combustion engine, the exhaust gas is made to react with the reducing agent supplied from the exhaust gas, and the reduction is performed downstream of the reducing agent supply apparatus and upstream of the catalyst. A dispersion plate that mixes the agent and the exhaust and disperses the reducing agent widely over the entire cross section of the exhaust passage, and the dispersion plate is constituted by a plurality of flat plates arranged in parallel to the axial direction of the exhaust passage, The arrangement shape of the inlet portions into which the reducing agent and the exhaust flow of the plurality of flat plates of the dispersion plate forms a substantially straight line in the cross section in the exhaust passage axial direction, and the angle of the straight line with respect to the injection axis direction of the reducing agent supply device But at a right angle Ri, wherein the plurality of flat plates, the arrangement shape of the inlet portion of the reducing agent and the exhaust flows, edge as viewed from the exhaust passage axial direction upstream, substantially linear in a direction substantially perpendicular to the exhaust passage axial direction And the straight line is arranged so as to be substantially perpendicular to the injection axis direction of the reducing agent supply device, and the reducing agent is substantially evenly distributed on the plurality of flat plates of the dispersion plate at the inlet portion. Injected and flows into the plurality of flat plates, and the axial length of the dispersion plate from the dispersion plate inlet portion to the dispersion plate outlet portion is substantially the same from the top to the bottom in the cross section in the exhaust passage axial direction. A dispersion plate is provided.

すなわち、請求項２の発明では、分散板の軸方向長さを、排気通路軸方向断面における上部から下部にわたって略同一とすることにより、分散板内の温度分布や圧力損失等を略均一にすることができ、分散板内の各平板に噴射した後の還元剤の蒸発や、還元剤の、各平板への付着等も略均等とすることができる。従って、触媒に対してより均一化された混合流れを供給することができ、形状が簡単で、生産性が高く、耐久性を有し、圧力損失が小さい分散板を提供することができる。 That is, in the invention of claim 2 , the axial length of the dispersion plate is made substantially the same from the upper part to the lower part in the cross section in the axial direction of the exhaust passage, so that the temperature distribution and pressure loss in the dispersion plate are made substantially uniform. In addition, evaporation of the reducing agent after spraying on each flat plate in the dispersion plate, adhesion of the reducing agent to each flat plate, and the like can be made substantially uniform. Therefore, a more uniform mixed flow can be supplied to the catalyst, and a dispersion plate having a simple shape, high productivity, durability, and low pressure loss can be provided.

各請求項に記載の発明によれば、還元剤供給装置を排気通路の直管部に配置し、還元剤を斜めの方向から噴射する場合において、還元剤と排気ガスとの良好な混合を行なうことができ、触媒に対して略均一な混合流れを供給することができる、形状が簡単で、生産性が高く、耐久性を有し、圧力損失が小さい分散板を提供するという共通の効果を奏する。   According to the invention described in each claim, when the reducing agent supply device is disposed in the straight pipe portion of the exhaust passage and the reducing agent is injected from an oblique direction, the reducing agent and the exhaust gas are mixed well. A common effect of providing a dispersion plate that can supply a substantially uniform mixed flow to the catalyst, has a simple shape, high productivity, durability, and low pressure loss. Play.

以下、添付図面を用いて本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１は、本発明を分散板に適用した場合の、実施形態の概略構成を説明する排気通路軸方向断面図である。触媒３の上流の排気通路１の直管部に還元剤供給装置５を配置し、排気通路１に対して斜めの方向から還元剤を噴射する。触媒３では、還元剤供給装置５から供給された還元剤と排気とを反応させ、排気浄化を行う。還元剤供給装置５の下流であって、触媒３に対して上流側に、還元剤と排気とを混合し、還元剤を排気通路の断面全体にわたって広く分散させる分散板６ａ又は６ｂを備える。分散板６ａ又は６ｂは、複数の平板を、分散板内に排気通路軸方向に対して平行に配置して構成する。分散板６ａ及び６ｂの形状は、以下の図３及び図４の説明で詳述する。   FIG. 1 is a sectional view in the axial direction of an exhaust passage for explaining a schematic configuration of an embodiment when the present invention is applied to a dispersion plate. A reducing agent supply device 5 is disposed in the straight pipe portion of the exhaust passage 1 upstream of the catalyst 3, and the reducing agent is injected from an oblique direction with respect to the exhaust passage 1. In the catalyst 3, the reducing agent supplied from the reducing agent supply device 5 reacts with the exhaust to perform exhaust purification. Downstream of the reducing agent supply device 5 and upstream of the catalyst 3, a dispersion plate 6 a or 6 b that mixes the reducing agent and exhaust and distributes the reducing agent over the entire cross section of the exhaust passage is provided. The dispersion plate 6a or 6b is configured by arranging a plurality of flat plates in the dispersion plate in parallel with the exhaust passage axial direction. The shape of the dispersion plates 6a and 6b will be described in detail with reference to FIGS. 3 and 4 below.

図１に示すように、分散板６ａ又は６ｂは、排気通路軸方向断面において、分散板入口部６１が略直線となるように形成し、この直線が還元剤供給装置５の噴射軸線方向に対してなす角度Ｂを、略直角となるように構成する。   As shown in FIG. 1, the dispersion plate 6 a or 6 b is formed so that the dispersion plate inlet 61 is substantially straight in the cross section in the exhaust passage axial direction, and this straight line is relative to the injection axis direction of the reducing agent supply device 5. The angle B to be formed is configured to be substantially a right angle.

このように構成するので、図１の発明では、噴射された還元剤の、分散板６ａ又は６ｂまでの到達距離が略等しくなり、蒸発時間が略等しくなるため、還元剤と排気ガスの良好な混合を行なうことができる。また、混合流れを排気通路１全体に分散させることができるため、触媒３に対して略均一な混合流れを供給することができる。また、排気通路管壁２へ付着する還元剤の量も減少させることができ、従来と同一の還元剤添加量で比較した場合には、浄化性能が向上する。従って、還元剤を排気ガスと良好に混合し、還元剤を排気通路の断面全体にわたって広く分散することができ、触媒に対して略均一な混合流れを供給することができる、形状が簡単で、生産性が高く、耐久性を有し、低圧損の、分散板を提供するという目的を達成することができる。   With this configuration, in the invention of FIG. 1, the reaching distance of the injected reducing agent to the dispersion plate 6a or 6b is substantially equal, and the evaporation times are substantially equal. Mixing can be performed. Further, since the mixed flow can be dispersed throughout the exhaust passage 1, a substantially uniform mixed flow can be supplied to the catalyst 3. Further, the amount of reducing agent adhering to the exhaust passage tube wall 2 can be reduced, and the purification performance is improved when compared with the same amount of reducing agent added as before. Therefore, the reducing agent can be well mixed with the exhaust gas, the reducing agent can be widely dispersed over the entire cross section of the exhaust passage, and a substantially uniform mixed flow can be supplied to the catalyst, the shape is simple, The object of providing a dispersion plate having high productivity, durability, and low pressure loss can be achieved.

図２は、従来の内燃機関の排気浄化装置の、実施形態の概略構成を説明する排気通路軸方向断面図であり、図１を図２と比較すると、排気通路軸方向断面における分散板入口部の角度が異なることが理解できる。   FIG. 2 is an exhaust passage axial sectional view illustrating a schematic configuration of an embodiment of a conventional internal combustion engine exhaust purification device. Compared with FIG. 1, FIG. 2 is a dispersion plate inlet section in the exhaust passage axial sectional view. It can be understood that the angles are different.

図３は、図１の分散板の一実施形態の概略構成を説明する図であり、分散板入口方向から見た図である。分散板６ａを、排気通路軸方向に対して平行に配置された複数の平板６２によって構成し、複数の平板６２の、排気通路軸方向上流から見た端縁部６５を、排気通路軸方向に対して略垂直方向に略直線状に延びるように構成し、この直線の、還元剤供給装置の噴射軸線方向に対してなす角度Ｄを、略直角となるように配置する。   FIG. 3 is a diagram for explaining a schematic configuration of an embodiment of the dispersion plate in FIG. 1, as viewed from the entrance direction of the dispersion plate. The dispersion plate 6a is constituted by a plurality of flat plates 62 arranged in parallel to the exhaust passage axial direction, and the edge portions 65 of the plurality of flat plates 62 viewed from the upstream side in the exhaust passage axial direction are arranged in the exhaust passage axial direction. On the other hand, it is configured to extend in a substantially straight line in a substantially vertical direction, and an angle D of this straight line with respect to the injection axis direction of the reducing agent supply device is arranged to be substantially a right angle.

このように配置すると、還元剤を、分散板６ａの平板６２に略均等に噴射することができるため、還元剤を排気ガスと良好に混合し、還元剤を排気通路の断面全体にわたって広く分散することができ、触媒３に対して略均一な混合流れを供給することができる。この分散板６ａは、形状が簡単で、生産性が高く、耐久性を有し、圧力損失を小さくすることができる。   With this arrangement, the reducing agent can be injected substantially uniformly onto the flat plate 62 of the dispersion plate 6a, so that the reducing agent is well mixed with the exhaust gas, and the reducing agent is widely dispersed throughout the entire cross section of the exhaust passage. And a substantially uniform mixed flow can be supplied to the catalyst 3. The dispersion plate 6a has a simple shape, high productivity, durability, and a small pressure loss.

図４は、図１の分散板の他の実施形態の概略構成を説明する図であり、分散板入口方向から見た図である。分散板６ｂは、排気通路軸方向に対する垂直断面を十字状に組み合わせ、排気通路軸方向に対して平行に配置した複数の平板６３によって構成し、複数の平板６３の、排気通路軸方向上流から見た端縁部６６（図４参照）の、十字状に直交する各辺の、還元剤供給装置の噴射軸線方向に対してなす角度Ｅを、略４５度となるように配置する。   FIG. 4 is a diagram illustrating a schematic configuration of another embodiment of the dispersion plate of FIG. 1 and is a view seen from the entrance direction of the dispersion plate. The dispersion plate 6b is composed of a plurality of flat plates 63 that are arranged in parallel with the exhaust passage axial direction by combining the cross sections perpendicular to the exhaust passage axial direction, and viewed from the upstream side of the exhaust passage axial direction of the plurality of flat plates 63. The angle E formed on each side of the end edge 66 (see FIG. 4) perpendicular to the cross shape with respect to the injection axis direction of the reducing agent supply device is arranged to be approximately 45 degrees.

このように配置すると、還元剤を、より広い表面積で分散板６ｂに噴射することができるため、還元剤が、より蒸発し易く、分散性が向上する。従って、還元剤を排気ガスと良好に混合し、還元剤を排気通路の断面全体にわたって広く分散することができ、触媒に対して略均一な混合流れを供給することがでる。この分散板６ｂは、形状が簡単で、生産性が高く、耐久性を有し、圧力損失を小さくすることができる。   When arranged in this way, the reducing agent can be sprayed onto the dispersion plate 6b with a larger surface area, so that the reducing agent is more easily evaporated and the dispersibility is improved. Therefore, the reducing agent can be well mixed with the exhaust gas, and the reducing agent can be widely dispersed over the entire cross section of the exhaust passage, so that a substantially uniform mixed flow can be supplied to the catalyst. The dispersion plate 6b has a simple shape, high productivity, durability, and a small pressure loss.

図５は、本発明を分散板に適用した場合の、他の実施形態の概略構成を説明する排気通路軸方向断面図である。分散板６ｃの、分散板入口部６１から分散板出口部６４までの軸方向長さを、排気通路軸方向断面における上部から下部にわたって略同一に構成する。   FIG. 5 is a sectional view in the axial direction of the exhaust passage for explaining a schematic configuration of another embodiment when the present invention is applied to a dispersion plate. The axial length of the dispersion plate 6c from the dispersion plate inlet portion 61 to the dispersion plate outlet portion 64 is configured to be substantially the same from the top to the bottom in the exhaust passage axial section.

すなわち、分散板６ｃの、分散板入口部６１から分散板出口部６４までの軸方向長さを略同一とすることにより、分散板６ｃ内の温度分布や圧力損失等を略均一にすることができ、分散板を構成する各平板に噴射した後の還元剤の蒸発や、還元剤の、各平板への付着等を略均等とすることができ、触媒３に対してより均一化された混合流れを供給することがでる。この分散板は、形状が簡単で、生産性が高く、耐久性を有し、圧力損失を小さくすることができる。更に、この構成では、排気浄化装置を計算モデルでシミュレーションする場合に、より簡単で正確な、還元剤すり抜けモデルや蒸発モデルを構成することができる。   That is, by making the axial length of the dispersion plate 6c from the dispersion plate inlet 61 to the dispersion plate outlet 64 substantially the same, the temperature distribution, pressure loss, etc. in the dispersion plate 6c can be made substantially uniform. It is possible to make the evaporation of the reducing agent after spraying on each flat plate constituting the dispersion plate, the adhesion of the reducing agent to each flat plate, etc. substantially uniform, and more uniform mixing with the catalyst 3 Can supply flow. This dispersion plate has a simple shape, high productivity, durability, and a small pressure loss. Furthermore, with this configuration, when the exhaust purification device is simulated with a calculation model, a simpler and more accurate reducing agent slip-through model and evaporation model can be configured.

本発明を分散板に適用した場合の、実施形態の概略構成を説明する排気通路軸方向断面図である。It is an exhaust passage axial direction sectional view explaining a schematic structure of an embodiment at the time of applying the present invention to a distribution board. 従来の内燃機関の排気浄化装置の、実施形態の概略構成を説明する排気通路軸方向断面図である。It is an exhaust passage axial sectional view explaining an outline composition of an embodiment of a conventional exhaust gas purification device of an internal-combustion engine. 図１の分散板の一実施形態の概略構成を説明する図であり、分散板入口方向から見た図である。It is a figure explaining schematic structure of one Embodiment of the dispersing plate of FIG. 1, and is the figure seen from the dispersing plate entrance direction. 図１の分散板の他の実施形態の概略構成を説明する図であり、分散板入口方向から見た図である。It is a figure explaining schematic structure of other embodiments of a distribution board of Drawing 1, and it is a figure seen from a distribution board entrance direction. 本発明を分散板に適用した場合の、他の実施形態の概略構成を説明する排気通路軸方向断面図である。It is an exhaust passage axial sectional view explaining the schematic structure of other embodiments at the time of applying the present invention to a distribution board.

符号の説明Explanation of symbols

１ 排気通路
２ 排気通路管壁
３ 触媒
５ 還元剤供給装置
６ａ 分散板
６ｂ 分散板
６ｃ 分散板
９ 円錐状拡大通路部
１２ 触媒入口
１３ 触媒保持部材
６１ 分散板入口部
６２ 平板
６３ 平板
６４ 分散板出口部
６５ 平板６２の端縁部の辺
６６ 平板６３の端縁部の辺
Ａ 排気流れ方向
Ｂ 噴射軸線方向に対して分散板入口部がなす角度
Ｄ 噴射軸線方向と平板端縁部の辺との間の角度
Ｅ 噴射軸線方向と平板端縁部の辺との間の角度 DESCRIPTION OF SYMBOLS 1 Exhaust passage 2 Exhaust passage pipe wall 3 Catalyst 5 Reducing agent supply device 6a Dispersion plate 6b Dispersion plate 6c Dispersion plate 9 Conical expansion passage portion 12 Catalyst inlet 13 Catalyst holding member 61 Dispersion plate inlet portion 62 Flat plate 63 Flat plate 64 Dispersion plate outlet Part 65 Edge edge side of flat plate 62 66 Edge edge side of flat plate 63 A Exhaust flow direction B Angle formed by dispersion plate inlet with respect to injection axis direction D Between injection axis direction and edge of flat plate edge Angle between E The angle between the injection axis direction and the edge of the flat plate edge

Claims (2)

触媒上流の排気通路直管部に還元剤供給装置を配置し、排気通路に対して斜めの方向から還元剤を噴射し、触媒において、還元剤供給装置から供給された還元剤と排気とを反応させ、排気浄化をするようにした内燃機関の排気浄化装置において、
前記還元剤供給装置の下流であって、前記触媒に対して上流側に、前記還元剤と排気とを混合し、還元剤を排気通路の断面全体にわたって広く分散させる分散板を備え、
前記分散板が、前記排気通路軸方向に対して平行に配置された複数の平板によって構成され、
前記分散板の複数の平板の、還元剤及び排気が流入する入口部の配置形状が、排気通路軸方向断面において略直線を形成し、前記直線の、前記還元剤供給装置の噴射軸線方向に対する角度が、略直角であり、
前記複数の平板の、還元剤及び排気が流入する入口部の配置形状の、前記排気通路軸方向上流から見た端縁部が、前記排気通路軸方向に対して略垂直方向に略直線状に延び、前記直線が、前記還元剤供給装置の噴射軸線方向に対して、略直角となるように配置され、
前記還元剤が、前記入口部で前記分散板の複数の平板に略均等に噴射され、前記複数の平板に流入することを特徴とする、分散板。 A reducing agent supply device is disposed in the exhaust pipe straight pipe upstream of the catalyst, and the reducing agent is injected from an oblique direction with respect to the exhaust passage, and the catalyst reacts with the reducing agent supplied from the reducing agent supply device and the exhaust gas. In an exhaust gas purification apparatus for an internal combustion engine that is configured to purify exhaust gas,
A dispersion plate that mixes the reducing agent and the exhaust gas downstream of the reducing agent supply device and upstream of the catalyst, and disperses the reducing agent over the entire cross section of the exhaust passage,
The dispersion plate is constituted by a plurality of flat plates arranged in parallel to the exhaust passage axial direction,
The arrangement shape of the inlet portions into which the reducing agent and the exhaust flow of the plurality of flat plates of the dispersion plate forms a substantially straight line in the cross section in the exhaust passage axial direction, and the angle of the straight line with respect to the injection axis direction of the reducing agent supply device Is approximately a right angle,
The edge portions of the plurality of flat plates arranged at the inlet portion into which the reducing agent and the exhaust flow are viewed from the upstream side in the exhaust passage axial direction are substantially straight in a direction substantially perpendicular to the exhaust passage axial direction. Extending and arranged such that the straight line is substantially perpendicular to the injection axis direction of the reducing agent supply device ,
Wherein the reducing agent is injected in a substantially equally a plurality of flat plates of the distributor plate in the inlet portion, characterized that you flowing said a plurality of flat plates, the dispersion plate. 触媒上流の排気通路直管部に還元剤供給装置を配置し、排気通路に対して斜めの方向から還元剤を噴射し、触媒において、還元剤供給装置から供給された還元剤と排気とを反応させ、排気浄化をするようにした内燃機関の排気浄化装置において、
前記還元剤供給装置の下流であって、前記触媒に対して上流側に、前記還元剤と排気とを混合し、還元剤を排気通路の断面全体にわたって広く分散させる分散板を備え、
前記分散板が、前記排気通路軸方向に対して平行に配置された複数の平板によって構成され、
前記分散板の複数の平板の、還元剤及び排気が流入する入口部の配置形状が、排気通路軸方向断面において略直線を形成し、前記直線の、前記還元剤供給装置の噴射軸線方向に対する角度が、略直角であり、
前記複数の平板の、還元剤及び排気が流入する入口部の配置形状の、前記排気通路軸方向上流から見た端縁部が、前記排気通路軸方向に対して略垂直方向に略直線状に延び、前記直線が、前記還元剤供給装置の噴射軸線方向に対して、略直角となるように配置され、
前記還元剤が、前記入口部で前記分散板の複数の平板に略均等に噴射され、前記複数の平板に流入し、
更に、前記分散板の、分散板入口部から分散板出口部までの軸方向長さが、排気通路軸方向断面における上部から下部にわたって略同一であることを特徴とする、分散板。 A reducing agent supply device is disposed in the exhaust pipe straight pipe upstream of the catalyst, and the reducing agent is injected from an oblique direction with respect to the exhaust passage, and the catalyst reacts with the reducing agent supplied from the reducing agent supply device and the exhaust gas. In an exhaust gas purification apparatus for an internal combustion engine that is configured to purify exhaust gas,
A dispersion plate that mixes the reducing agent and the exhaust gas downstream of the reducing agent supply device and upstream of the catalyst, and disperses the reducing agent over the entire cross section of the exhaust passage,
The dispersion plate is constituted by a plurality of flat plates arranged in parallel to the exhaust passage axial direction,
The arrangement shape of the inlet portions into which the reducing agent and the exhaust flow of the plurality of flat plates of the dispersion plate forms a substantially straight line in the cross section in the exhaust passage axial direction, and the angle of the straight line with respect to the injection axis direction of the reducing agent supply device Is approximately a right angle,
The edge portions of the plurality of flat plates arranged at the inlet portion into which the reducing agent and the exhaust flow are viewed from the upstream side in the exhaust passage axial direction are substantially straight in a direction substantially perpendicular to the exhaust passage axial direction. Extending and arranged such that the straight line is substantially perpendicular to the injection axis direction of the reducing agent supply device,
The reducing agent is injected substantially evenly onto the plurality of flat plates of the dispersion plate at the inlet, and flows into the plurality of flat plates,
Further, the dispersion plate is characterized in that the axial length from the dispersion plate inlet portion to the dispersion plate outlet portion of the dispersion plate is substantially the same from the upper part to the lower part in the exhaust passage axial section.
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