JP5051396B2 - Exhaust passage structure - Google Patents

Exhaust passage structure Download PDF

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JP5051396B2
JP5051396B2 JP2009003464A JP2009003464A JP5051396B2 JP 5051396 B2 JP5051396 B2 JP 5051396B2 JP 2009003464 A JP2009003464 A JP 2009003464A JP 2009003464 A JP2009003464 A JP 2009003464A JP 5051396 B2 JP5051396 B2 JP 5051396B2
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exhaust
bending direction
purification catalyst
exhaust gas
exhaust passage
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JP2010159719A (en
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希代香 恒川
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Mitsubishi Motors Corp
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Description

本発明は、排気通路構造に係り、詳しくはエンジンの排気通路に設けられた排気後処理装置に流入する排気を整流する技術に関する。   The present invention relates to an exhaust passage structure, and more particularly to a technique for rectifying exhaust gas flowing into an exhaust aftertreatment device provided in an exhaust passage of an engine.

車両に搭載されるエンジンの排気管には、排気後処理装置として三元触媒やＮＯx吸蔵触媒等の排気浄化触媒が備えられている。排気浄化触媒は、通常、排気処理量を向上させるために、排気管より大径に形成され、排気流入面が大きく確保されている。管路内を通過する気体は、中央部での流速が大きく、外周部での流速が低下するので、上記のような排気浄化触媒では、排気流入面のうち中央部に偏って排気が流入し易く、外周部には排気が流入し難くなる。そこで、排気浄化触媒の有効活用を図るため、例えば排気浄化触媒の排気流入面の直前に排気を拡散するミキサーを設けたものが知られている（特許文献１）。   An exhaust pipe of an engine mounted on a vehicle is provided with an exhaust purification catalyst such as a three-way catalyst or a NOx storage catalyst as an exhaust aftertreatment device. The exhaust purification catalyst is usually formed with a larger diameter than the exhaust pipe in order to improve the exhaust processing amount, and a large exhaust inflow surface is secured. Since the gas passing through the pipeline has a large flow velocity at the central portion and a low flow velocity at the outer peripheral portion, in the exhaust purification catalyst as described above, the exhaust flows in the central portion of the exhaust inflow surface. It is easy to make it difficult for the exhaust gas to flow into the outer peripheral portion. Therefore, in order to effectively use the exhaust purification catalyst, for example, a mixer provided with a mixer that diffuses exhaust just before the exhaust inflow surface of the exhaust purification catalyst is known (Patent Document 1).

特開２００７−２３９４８６号公報JP 2007-239486 A

しかしながら、上記のように排気浄化触媒の直前にミキサーを設けようとすると、排気浄化触媒とともにミキサーを内包する触媒コンバータが大きくなってしまうので、触媒コンバータの搭載可能な場所が限られてしまう。例えば、エンジンに近接して触媒コンバータを配置しようとすると、搭載スペースが限られることから、ミキサーを搭載する分排気浄化触媒を小型化しなければならず、触媒容量の確保が困難となってしまう。また、ミキサーを搭載すると、部品点数が増加してコスト増加を招くとともに、レイアウトが複雑化してしまう。更には、ミキサーの作動制御が必要となり制御の煩雑化も招いてしまう。   However, if an attempt is made to provide a mixer immediately before the exhaust purification catalyst as described above, the catalytic converter that encloses the mixer together with the exhaust purification catalyst becomes large, so the place where the catalytic converter can be mounted is limited. For example, if the catalytic converter is arranged close to the engine, the mounting space is limited. Therefore, it is necessary to reduce the size of the exhaust purification catalyst on which the mixer is mounted, and it becomes difficult to secure the catalyst capacity. If a mixer is mounted, the number of parts increases, resulting in an increase in cost and a complicated layout. Furthermore, it is necessary to control the operation of the mixer, resulting in complicated control.

特に、触媒コンバータの直前で排気通路が屈曲している場合には、屈曲部での排気通路のうち内側位置及び外側位置とで排気の通過し易さが異なるので、排気浄化触媒の排気流入面のうち屈曲方向外側の部分に多く排気が流入する一方、屈曲方向内側の部分には排気の流入量が減少する。したがって、排気浄化触媒への排気の流入が偏り、排気浄化触媒の利用効率が低下してしまうといった問題点がある。   In particular, when the exhaust passage is bent just before the catalytic converter, the ease of passage of exhaust gas differs between the inner position and the outer position of the exhaust passage at the bent portion. Among them, a large amount of exhaust gas flows into the outer part in the bending direction, while the inflow amount of exhaust gas decreases in the inner part in the bending direction. Therefore, there is a problem in that the inflow of exhaust gas to the exhaust purification catalyst is biased and the utilization efficiency of the exhaust purification catalyst is lowered.

本発明はこのような問題点を解決するためになされたもので、その目的とするところは、簡単かつコンパクトな構成で、屈曲部の下流に設けられた排気後処理装置への排気の流入を均一にして、排気後処理装置の利用効率を向上させる排気通路構造を提供することにある。   The present invention has been made to solve such problems. The object of the present invention is to reduce the inflow of exhaust gas to an exhaust aftertreatment device provided downstream of the bent portion with a simple and compact configuration. An object of the present invention is to provide an exhaust passage structure that is uniform and improves the utilization efficiency of the exhaust aftertreatment device.

上記した目的を達成するために、請求項１の発明は、エンジンの排気通路の屈曲部と該屈曲部の下流側に設けられた排気後処理装置との間に排気の流れに対向して備えられ、排気後処理装置へ流入する排気が通過する対向部材を有する排気通路構造において、対向部材は複数の通気孔の開いた板部材によって形成され、屈曲部の屈曲方向中央に位置する通気孔の孔径は、屈曲方向内側及び屈曲方向外側に位置する通気孔の孔径より小さく、かつ屈曲方向内側に位置する通気孔の孔径は、屈曲方向外側に位置する通気孔の孔径より大きく形成されていることを特徴とする。 In order to achieve the above object, the invention of claim 1 is provided between the bent portion of the exhaust passage of the engine and the exhaust aftertreatment device provided downstream of the bent portion so as to oppose the exhaust flow. In the exhaust passage structure having an opposing member through which the exhaust gas flowing into the exhaust aftertreatment device passes, the opposing member is formed by a plate member having a plurality of ventilation holes, and the ventilation hole located at the center of the bending portion in the bending direction is formed. The hole diameter is smaller than the hole diameter of the vent hole located on the inner side in the bending direction and the outer side in the bending direction, and the hole diameter of the vent hole located on the inner side in the bending direction is larger than the hole diameter of the vent hole located on the outer side in the bending direction. It is characterized by.

また、請求項２の発明は、請求項１において、少なくとも通気孔の一部は、下流側が屈曲方向内側に向かい傾斜して形成されることを特徴とする。 The invention of claim 2 is characterized in that, in claim 1 , at least a part of the vent hole is formed such that the downstream side is inclined toward the inner side in the bending direction.

請求項１の排気通路構造によれば、対向部材の排気抵抗により、屈曲方向内側位置では排気が最も通過し易く、次に屈曲方向外側位置、そして排気通路の中央部では排気が最も通過し難くなる。通常、排気通路の中央部では排気が流通し易く、外周部では排気が流通し難くなる。また、屈曲部では、屈曲方向内側位置より屈曲方向外側位置の方が排気が流通し易くなる。したがって、この対向部材に排気抵抗の大小をつけることにより容易に、排気後処理装置への偏った排気の流入を抑制でき、排気後処理装置の利用効率を向上させることができる。 According to the exhaust passage structure of claim 1, due to the exhaust resistance of the opposing member, the exhaust gas is most likely to pass at the inner position in the bending direction, and then the exhaust gas is most difficult to pass at the outer position in the bending direction and at the central portion of the exhaust passage. Become. Usually, the exhaust gas easily flows in the central portion of the exhaust passage, and the exhaust gas hardly flows in the outer peripheral portion. Further, in the bent portion, the exhaust gas is more likely to circulate at the position outside the bending direction than at the position inside the bending direction. Therefore, it is possible to easily suppress the uneven flow of exhaust gas into the exhaust aftertreatment device by providing the opposing member with the magnitude of the exhaust resistance, thereby improving the utilization efficiency of the exhaust aftertreatment device .

請求項２の排気通路構造によれば、通気孔の傾きを変えるだけで排気後処理装置への偏った排気の流入を抑制でき、排気後処理装置の利用効率を向上させることができる。 According to the exhaust passage structure of the second aspect , it is possible to suppress uneven inflow of exhaust gas into the exhaust aftertreatment device only by changing the inclination of the vent hole, and it is possible to improve the utilization efficiency of the exhaust aftertreatment device.

本発明に係る整流板を備えたエンジンの排気通路の構成図である。It is a block diagram of the exhaust passage of the engine provided with the baffle plate which concerns on this invention. 整流板の構造を示す正面図である。It is a front view which shows the structure of a baffle plate. 整流板の通気孔の形状を示す断面図である。It is sectional drawing which shows the shape of the ventilation hole of a baffle plate.

以下、本発明の実施形態を添付図面に基づき説明する。
図１は、本発明に係る整流板（対向部材）を備えたエンジンの排気通路の構成図である。
エンジン１の排気通路である排気管２には、排気を処理する排気後処理装置として、三元触媒、ＮＯｘ吸蔵触媒、酸化触媒等の排気浄化触媒３が介装されている。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a configuration diagram of an exhaust passage of an engine provided with a current plate (opposing member) according to the present invention.
An exhaust purification catalyst 3 such as a three-way catalyst, a NOx storage catalyst, and an oxidation catalyst is interposed in an exhaust pipe 2 that is an exhaust passage of the engine 1 as an exhaust aftertreatment device that processes exhaust gas.

本実施形態では、ターボチャージャ４の下流に排気管２の屈曲部５が設けられている。排気浄化触媒３は、屈曲部５の直後に配置されている。また、排気浄化触媒３は、筒状の触媒コンバータ６に内包され、略円筒状に形成されるとともに、排気処理量を確保するために、排気管２より大径に形成されている。触媒コンバータ６の排気浄化触媒３の上流側の部位６ａは、内径が屈曲部５から排気浄化触媒３に向かって拡径したテーパコーン状に形成されている。   In the present embodiment, the bent portion 5 of the exhaust pipe 2 is provided downstream of the turbocharger 4. The exhaust purification catalyst 3 is disposed immediately after the bent portion 5. The exhaust purification catalyst 3 is included in a cylindrical catalytic converter 6 and is formed in a substantially cylindrical shape, and has a larger diameter than the exhaust pipe 2 in order to ensure an exhaust processing amount. A portion 6 a upstream of the exhaust purification catalyst 3 of the catalytic converter 6 is formed in a tapered cone shape whose inner diameter is increased from the bent portion 5 toward the exhaust purification catalyst 3.

屈曲部５と排気浄化触媒３との間には、排気の流れを整流する整流板７が設けられている。整流板７は、複数の通気孔８が設けられた薄板部材であって、排気通路を仕切るように配置されている。したがって、屈曲部５を通過した排気は、次に整流板７の通気孔８を通過して、排気浄化触媒３の上流側端面である排気流入面３ａに流入する。
図２は、本発明の第１の実施形態に係る整流板７の構造を示す正面図である。 A rectifying plate 7 that rectifies the flow of exhaust gas is provided between the bent portion 5 and the exhaust purification catalyst 3. The rectifying plate 7 is a thin plate member provided with a plurality of vent holes 8, and is arranged so as to partition the exhaust passage. Therefore, the exhaust gas that has passed through the bent portion 5 next passes through the vent hole 8 of the rectifying plate 7 and flows into the exhaust inflow surface 3 a that is the upstream end surface of the exhaust purification catalyst 3.
FIG. 2 is a front view showing the structure of the rectifying plate 7 according to the first embodiment of the present invention.

図２に示すように、通気孔８は、整流板７の全面に亘って設けられている。特に、本実
施形態では、通気孔８はその位置によって孔径が異なる構造となっている。詳しくは、通気孔８は、屈曲部５の屈曲方向において、整流板７の中央位置Ｂと、中央位置Ｂより内側の内側位置Ａと、中央位置Ｂより外側の外側位置Ｃとで、通気孔８の孔径が異なるように形成されている。この３つの位置Ａ〜Ｃのうち、内側位置Ａの通気孔８ａの孔径が最も大きく、次に外側位置Ｃの通気孔８ｃ、そして中央位置Ｂの通気孔８ｂの孔径が最も小さく形成されている。したがって、整流板７の内側位置Ａでは排気が通過し易く、次に外側位置Ｃ、そして中央位置Ｂでは最も排気が通過し難くなっている。 As shown in FIG. 2, the vent hole 8 is provided over the entire surface of the rectifying plate 7. In particular, in this embodiment, the vent hole 8 has a structure in which the hole diameter varies depending on the position. Specifically, the ventilation holes 8 are formed at the central position B of the rectifying plate 7, the inner position A inside the center position B, and the outer position C outside the center position B in the bending direction of the bent portion 5. 8 are formed to have different hole diameters. Among these three positions A to C, the hole diameter of the vent hole 8a at the inner position A is the largest, and the hole diameter of the vent hole 8c at the outer position C and the vent hole 8b at the center position B are the smallest. . Therefore, the exhaust gas easily passes through the inner position A of the current plate 7, and the exhaust gas hardly passes through the outer position C and the central position B next.

ところで、屈曲部５では、その内部の通過位置によって排気の通過し易さが大きく異なっている。具体的には、排気は屈曲方向内側位置より屈曲方向外側位置の方が流れ易い。したがって、例えば整流板７がない場合には、屈曲部５の直後に設けられた排気浄化触媒３に対して、屈曲方向外側位置には排気が流入し易い一方、内側位置には排気が流入し難くなる。また、一般的に、屈曲部５内の中央部と外周部とでは、外周部の方が排気が通過し易くなる。しかしながら、本実施形態では、上記のように屈曲部５の下流に通気孔８の孔径が位置によって異なる整流板７を備えたことで、屈曲部５における排気の流通性の偏りが整流板７における排気の流通性の偏りにより分散され、相殺されることとなる。したがって、排気浄化触媒３の排気流入面３ａに排気が均一に流入し、排気浄化触媒３を効率的に活用させることができる。   By the way, in the bending part 5, the easiness of passage of exhaust_gas | exhaustion greatly changes with the passage positions in the inside. Specifically, the exhaust gas flows more easily at the outer position in the bending direction than at the inner position in the bending direction. Therefore, for example, when the rectifying plate 7 is not provided, the exhaust gas easily flows into the outer position in the bending direction with respect to the exhaust purification catalyst 3 provided immediately after the bent portion 5, while the exhaust gas flows into the inner position. It becomes difficult. Further, generally, the exhaust gas easily passes through the outer peripheral portion at the central portion and the outer peripheral portion in the bent portion 5. However, in the present embodiment, as described above, the flow rectifying plate 7 having the diameter of the vent hole 8 that differs depending on the position is provided downstream of the bent portion 5, so that the unevenness in the flow of exhaust gas in the bent portion 5 It is dispersed and offset by the uneven distribution of exhaust gas. Therefore, the exhaust gas uniformly flows into the exhaust inflow surface 3a of the exhaust purification catalyst 3, and the exhaust purification catalyst 3 can be used efficiently.

このように排気浄化触媒３を効率的に活用できることから、排気浄化効率を向上させることができる。よって、排気浄化触媒３の触媒容量を抑えることができ、コストの低減を図ることができる。
また、整流板７を設けることで、排気浄化触媒３への排気の流入を均一にすることができるので、従来技術のようにミキサーを設ける必要がなく、触媒コンバータ６のコンパクト化を図ることができる。したがって、触媒コンバータ６の搭載位置の自由度が増加し、レイアウト設計を容易にすることができる。例えば、エンジン１に近接した位置に触媒コンバータ６の搭載が容易となり、エンジンシステム全体のコンパクト化を図ることができる。 Since the exhaust purification catalyst 3 can be efficiently used in this way, exhaust purification efficiency can be improved. Therefore, the catalyst capacity of the exhaust purification catalyst 3 can be suppressed, and the cost can be reduced.
Further, since the flow of the exhaust gas to the exhaust purification catalyst 3 can be made uniform by providing the rectifying plate 7, there is no need to provide a mixer as in the prior art, and the catalytic converter 6 can be made compact. it can. Therefore, the degree of freedom of the mounting position of the catalytic converter 6 is increased, and the layout design can be facilitated. For example, the catalytic converter 6 can be easily mounted at a position close to the engine 1 and the entire engine system can be made compact.

図３は、整流板７の通気孔８の形状を示す断面図である。
更に、図３に示すように、整流板７において、屈曲方向内側の通気孔８の延びる方向を屈曲方向内側に傾斜させるとよい。このようにすれば、整流板７で分散した排気が更に屈曲方向内側に指向することになり、一番排気が到達しにくい排気浄化触媒３の排気流入面３ａの屈曲方向内側まで排気が均一に流入し、更に排気浄化触媒３の利用効率を向上させることができる。 FIG. 3 is a cross-sectional view showing the shape of the vent hole 8 of the rectifying plate 7.
Furthermore, as shown in FIG. 3, in the current plate 7, the extending direction of the vent hole 8 on the inner side in the bending direction may be inclined toward the inner side in the bending direction. In this way, the exhaust gas dispersed by the rectifying plate 7 is directed further inward in the bending direction, and the exhaust gas is evenly distributed to the inner side in the bending direction of the exhaust gas inflow surface 3a of the exhaust purification catalyst 3 where the exhaust gas hardly reaches. Then, the utilization efficiency of the exhaust purification catalyst 3 can be improved.

なお、通気孔８の傾斜を屈曲方向内側だけでなく全体的に設ければ、整流板７に排気抵抗の差を設けなくとも排気の分散を行うこともできる。
なお、以上の実施形態では、排気浄化触媒３に対して本発明を適用し、排気浄化触媒３への排気の流入を均一にしているが、本発明はこれに限られたものではなく、例えばディーゼルエンジンに採用されるディーゼルパティキュレートフィルタのような排気後処理装置に対しても適用することができる。 If the inclination of the vent hole 8 is provided not only on the inner side in the bending direction but also on the whole, it is possible to disperse the exhaust without providing a difference in the exhaust resistance in the rectifying plate 7.
In the above embodiment, the present invention is applied to the exhaust purification catalyst 3, and the inflow of exhaust gas to the exhaust purification catalyst 3 is made uniform. However, the present invention is not limited to this, for example, The present invention can also be applied to an exhaust aftertreatment device such as a diesel particulate filter employed in a diesel engine.

１ エンジン
２ 排気管
３ 排気浄化触媒
５ 屈曲部
７ 整流板
８ 通気孔 DESCRIPTION OF SYMBOLS 1 Engine 2 Exhaust pipe 3 Exhaust purification catalyst 5 Bending part 7 Current plate 8 Vent

Claims (2)

エンジンの排気通路の屈曲部と該屈曲部の下流側に設けられた排気後処理装置との間に排気の流れに対向して備えられ、前記排気後処理装置へ流入する排気が通過する対向部材を有する排気通路構造において、
前記対向部材は複数の通気孔の開いた板部材によって形成され、
前記屈曲部の屈曲方向中央に位置する前記通気孔の孔径は、屈曲方向内側及び屈曲方向外側に位置する前記通気孔の孔径より小さく、かつ前記屈曲方向内側に位置する前記通気孔の孔径は、前記屈曲方向外側に位置する前記通気孔の孔径より大きく形成されていることを特徴とする排気通路構造。 An opposing member provided opposite to the exhaust flow between the bent portion of the exhaust passage of the engine and the exhaust aftertreatment device provided on the downstream side of the bent portion, through which the exhaust flowing into the exhaust aftertreatment device passes In the exhaust passage structure having
The opposing member is formed by a plate member having a plurality of vent holes,
The hole diameter of the vent hole located in the center of the bent portion in the bending direction is smaller than the hole diameter of the vent hole located in the bending direction inner side and the bending direction outer side, and the hole diameter of the vent hole located in the bending direction inner side is: An exhaust passage structure, wherein the exhaust passage structure is formed larger than a diameter of the vent hole located on the outer side in the bending direction . 少なくとも前記通気孔の一部は、下流側が前記屈曲方向内側に向かい傾斜して形成されることを特徴とする請求項１に記載の排気通路構造。
The exhaust passage structure according to claim 1 , wherein at least a part of the vent hole is formed such that a downstream side is inclined toward the inside in the bending direction.
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JP4580598B2 (en) * 2001-06-22 2010-11-17 株式会社小松製作所 Exhaust gas purification device for internal combustion engine

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