JP5112815B2 - Exhaust purification device - Google Patents

Exhaust purification device Download PDF

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JP5112815B2
JP5112815B2 JP2007276248A JP2007276248A JP5112815B2 JP 5112815 B2 JP5112815 B2 JP 5112815B2 JP 2007276248 A JP2007276248 A JP 2007276248A JP 2007276248 A JP2007276248 A JP 2007276248A JP 5112815 B2 JP5112815 B2 JP 5112815B2
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exhaust
dispersion plate
casing
exhaust gas
exhaust purification
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JP2009103068A (en
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則行 ▲高▼橋
稔 小和田
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Hino Motors Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Description

本発明は、排気浄化装置に関するものである。   The present invention relates to an exhaust emission control device.

ディーゼルエンジンから排出されるパティキュレート（Particulate Matter：粒子状物質）は、炭素質から成る煤分と、高沸点炭化水素成分から成るＳＯＦ分（Soluble Organic Fraction：可溶性有機成分）とを主成分とし、更に微量のサルフェート（ミスト状硫酸成分）を含んだ組成を成すものであるが、この種のパティキュレートの低減対策としては、排気ガスが流通する排気管の途中に、パティキュレートフィルタを装備することが従来より行われている。   Particulate matter (particulate matter) discharged from diesel engines is mainly composed of carbonaceous soot and SOF (Soluble Organic Fraction) consisting of high-boiling hydrocarbon components. Furthermore, the composition contains a small amount of sulfate (mist-like sulfuric acid component). As a measure to reduce this type of particulates, a particulate filter is installed in the middle of the exhaust pipe through which the exhaust gas flows. Has been performed conventionally.

前記パティキュレートフィルタは、コージェライト等のセラミックから成る多孔質のハニカム構造となっており、格子状に区画された各流路の入口が交互に目封じされ、入口が目封じされていない流路については、その出口が目封じされるようになっており、各流路を区画する多孔質薄壁を透過した排気ガスのみが下流側へ排出されるようにしてある。   The particulate filter has a porous honeycomb structure made of a ceramic such as cordierite, and the inlets of the respective channels partitioned in a lattice shape are alternately sealed, and the channels are not sealed. The outlet is sealed, and only the exhaust gas that has permeated through the porous thin wall that defines each flow path is discharged downstream.

そして、排気ガス中のパティキュレートは、前記多孔質薄壁の内側表面に捕集されて堆積するので、目詰まりにより排気抵抗が増加しないうちにパティキュレートを適宜に燃焼除去してパティキュレートフィルタの再生を図る必要があるが、通常のディーゼルエンジンの運転状態においては、パティキュレートが自己燃焼するほどの高い排気温度が得られる機会が少ない為、酸化触媒を一体的に担持させた触媒再生型のパティキュレートフィルタの採用が検討されている。   Then, the particulates in the exhaust gas are collected and deposited on the inner surface of the porous thin wall, so that the particulates are appropriately burned and removed before the exhaust resistance increases due to clogging. It is necessary to regenerate, but in normal diesel engine operation conditions, there are few opportunities to obtain exhaust temperatures that are high enough for particulates to self-combust, so a catalyst regeneration type that integrally supports an oxidation catalyst. Adoption of a particulate filter is being studied.

即ち、このような触媒再生型のパティキュレートフィルタを採用すれば、捕集されたパティキュレートの酸化反応が促進されて着火温度が低下し、従来より低い排気温度でもパティキュレートを燃焼除去することが可能となる。   That is, if such a catalyst regeneration type particulate filter is employed, the oxidation reaction of the collected particulates is promoted to lower the ignition temperature, and the particulates can be burned and removed even at an exhaust temperature lower than the conventional one. It becomes possible.

ただし、斯かる触媒再生型のパティキュレートフィルタを採用した場合であっても、排気温度の低い運転領域では、パティキュレートの処理量よりも捕集量が上まわってしまうので、このような低い排気温度での運転状態が続くと、パティキュレートフィルタの再生が良好に進まずに該パティキュレートフィルタが過捕集状態に陥る虞れがある。   However, even when such a catalyst regeneration type particulate filter is used, the trapped amount exceeds the particulate processing amount in the operation region where the exhaust temperature is low, so such a low exhaust gas. If the operation state at the temperature continues, there is a possibility that the particulate filter will fall into an over trapped state without the regeneration of the particulate filter proceeding well.

そこで、パティキュレートフィルタの前段に、フロースルー型の酸化触媒を別途配置し、パティキュレートの堆積量が増加してきた段階で前記酸化触媒より上流側の排気ガス中に燃料を添加してパティキュレートフィルタの強制再生を行うことが考えられている。   Therefore, a flow-through type oxidation catalyst is separately arranged in front of the particulate filter, and fuel is added to the exhaust gas upstream of the oxidation catalyst at the stage where the amount of particulate accumulation has increased. It is considered to perform forced regeneration.

つまり、パティキュレートフィルタより上流側で添加された燃料（ＨＣ）が前段の酸化触媒を通過する間に酸化反応し、その反応熱で昇温した排気ガスの流入により直後のパティキュレートフィルタの触媒床温度が上げられてパティキュレートが燃やし尽くされ、パティキュレートフィルタの再生化が図られることになる。   That is, the fuel (HC) added on the upstream side of the particulate filter undergoes an oxidation reaction while passing through the preceding oxidation catalyst, and the catalyst bed of the particulate filter immediately after the inflow of exhaust gas heated by the reaction heat. The temperature is raised, the particulates are burned out, and the particulate filter is regenerated.

この種の燃料添加を実行するための具体的手段としては、圧縮上死点付近で行われる燃料のメイン噴射に続いて圧縮上死点より遅い非着火のタイミングでポスト噴射を追加することで排気ガス中に燃料を添加すれば良い。   As a specific means for executing this kind of fuel addition, post-injection is added at the timing of non-ignition later than the compression top dead center following the main injection of fuel performed near the compression top dead center. What is necessary is just to add a fuel in gas.

図２に示す如く、このようなパティキュレートフィルタ１を前段の酸化触媒２と一緒に排気管３の途中に装備するにあたっては、該排気管３の途中に介装したケーシング４内に、前段の酸化触媒２とパティキュレートフィルタ１とを直列に配置して収容せしめ、多数の散気孔５ａを有する円盤状の分散板５を前記酸化触媒２の入側に排気ガス６の流れ方向と直角に配置するようにしている。   As shown in FIG. 2, when installing such a particulate filter 1 in the middle of the exhaust pipe 3 together with the oxidation catalyst 2 in the previous stage, the front stage is placed in a casing 4 interposed in the middle of the exhaust pipe 3. The oxidation catalyst 2 and the particulate filter 1 are arranged and accommodated in series, and a disk-shaped dispersion plate 5 having a large number of air diffusion holes 5a is arranged on the inlet side of the oxidation catalyst 2 at right angles to the flow direction of the exhaust gas 6. Like to do.

また、前記ケーシング４の入側には、上流側の排気管３からの排気ガス６を導き入れる入口パイプ７を装備して前記分散板５の中央部分に突き当たる位置まで延在せしめ、この入口パイプ７のケーシング４内に入り込んだ部位に、多数の散気孔７ａを開口するようにしてあり、上流側の排気管３から導いた排気ガス６が入口パイプ７の各散気孔７ａ及び分散板５の各散気孔５ａを介し拡散されて酸化触媒２の入側端面に導かれるようになっている。   An inlet pipe 7 for introducing exhaust gas 6 from the upstream exhaust pipe 3 is provided on the inlet side of the casing 4 so as to extend to a position where it hits the central portion of the dispersion plate 5. A large number of air diffusion holes 7 a are opened at the portion of the casing 7 that has entered the casing 4, and the exhaust gas 6 introduced from the upstream exhaust pipe 3 passes through the air diffusion holes 7 a of the inlet pipe 7 and the dispersion plate 5. The gas is diffused through each air diffusion hole 5 a and guided to the inlet side end face of the oxidation catalyst 2.

尚、このような前段の酸化触媒２とパティキュレートフィルタ１との配置状態について技術開示した先行技術文献情報としては、例えば、本発明と同じ出願人による下記の特許文献１等がある。
特開２００４−２２５６５７号公報 In addition, as prior art document information that technically discloses the arrangement state of the oxidation catalyst 2 and the particulate filter 1 in the preceding stage, there is, for example, the following Patent Document 1 by the same applicant as the present invention.
JP 2004-225657 A

しかしながら、従来においては、酸化触媒２に導入される排気ガス６の流速分布の均一化と低圧損化を実現するため、分散板５から酸化触媒２の入側端面までの距離Ｌ1と、ケーシング４の前端（ケーシング４の分散板５より前方の部分を構成している鏡板８の最前端）から分散板５までの距離Ｌ2とを十分に長く確保する必要があったが、これらの距離Ｌ1，Ｌ2を長く確保していたことがケーシング４のコンパクト化を阻む一要因を成しており、車両への搭載性を改善するべくケーシング４のコンパクト化を実現することが望まれている。 However, conventionally, in order to achieve a uniform and low Sonka the flow velocity distribution of the exhaust gas 6 to be introduced to the oxidation catalyst 2 and the distance L 1 from the distribution plate 5 until entry end face of the oxidation catalyst 2, the casing 4, the distance L 2 from the front end of the casing 4 (the front end of the end plate 8 constituting the front part of the casing 4 in front of the dispersion plate 5) to the dispersion plate 5 had to be secured sufficiently long. The fact that L 1 and L 2 have been secured for a long time constitutes one factor that hinders the casing 4 from being made compact, and it is desired that the casing 4 be made compact in order to improve the mountability to the vehicle. Yes.

本発明は上述の実情に鑑みてなしたもので、酸化触媒等の排気浄化触媒に導入される排気ガスの流速分布の均一化と低圧損化を良好に保ちながらケーシングのコンパクト化を実現して車両への搭載性を改善することを目的としている。   The present invention has been made in view of the above circumstances, and realizes a compact casing while maintaining a uniform flow rate distribution and low pressure loss of exhaust gas introduced into an exhaust purification catalyst such as an oxidation catalyst. The purpose is to improve the mounting on the vehicle.

本発明は、排気管の途中に介装したケーシング内に、排気ガスを通過させて浄化する排気浄化触媒と、該排気浄化触媒の入側で排気ガスの流れを拡散せしめる分散板とを備えた排気浄化装置において、前記分散板を排気浄化触媒側へ向けて中央部分を張り出すようにした擂鉢状に形成し、前記ケーシングの入側に装備されて排気管からの排気ガスを導き入れる入口パイプを前記分散板の中央部分に突き当たる位置まで延在し、前記入口パイプのケーシング内に入り込んだ部位に多数の散気孔を開口し且つ排気浄化触媒側へ向けて徐々に縮径するテーパ形状を付したことを特徴とするものである。 The present invention includes an exhaust purification catalyst for purifying exhaust gas through a casing interposed in the middle of an exhaust pipe, and a dispersion plate for diffusing the flow of exhaust gas on the inlet side of the exhaust purification catalyst. In the exhaust purification device, an inlet pipe for introducing the exhaust gas from the exhaust pipe, which is provided on the inlet side of the casing and is formed in a bowl shape in which the central portion protrudes toward the exhaust purification catalyst side. Is extended to a position where it hits the central portion of the dispersion plate, and a plurality of air diffusion holes are opened in the portion of the inlet pipe that enters the casing, and a taper shape is provided that gradually reduces the diameter toward the exhaust purification catalyst side. it is characterized in that the.

而して、このようにすれば、分散板が排気浄化触媒側へ向けて中央部分を張り出すようにした擂鉢状に形成されているので、同じ流路断面内でも従来の円盤状の分散板と比較して面積が大きく確保されることになり、散気孔を増やして開口率を上げることで分散性の向上と圧損の低下が図られる。   Thus, in this way, since the dispersion plate is formed in a mortar shape so that the central portion protrudes toward the exhaust purification catalyst side, the conventional disk-like dispersion plate is used even within the same flow path cross section. In comparison with the above, the area is secured larger, and the dispersibility is improved and the pressure loss is reduced by increasing the air diffusion holes and increasing the aperture ratio.

しかも、分散板の中央部分が排気浄化触媒に近づくものの、外周側に向かうにつれて排気浄化触媒から離間して十分な距離が確保されるようになっており、分散板が擂鉢状となっていることにより排気ガスの通過方向が外周側に向けられて外周側への拡散が促されるようにもなっているので、このような作用によっても排気ガスの分散性が向上されることになる。   In addition, although the central portion of the dispersion plate approaches the exhaust purification catalyst, the separation plate is separated from the exhaust purification catalyst toward the outer peripheral side so that a sufficient distance is secured, and the dispersion plate has a bowl shape. As a result, the passage direction of the exhaust gas is directed to the outer peripheral side and the diffusion to the outer peripheral side is promoted. Therefore, the dispersibility of the exhaust gas is also improved by such an action.

この結果、分散板から排気浄化触媒の入側端面までの距離を従来より短縮しても、排気浄化触媒に導入される排気ガスの流速分布の均一化と低圧損化を従来と同程度に維持することが可能となる。   As a result, even if the distance from the dispersion plate to the inlet side end face of the exhaust purification catalyst is shortened compared to the past, the flow velocity distribution of the exhaust gas introduced into the exhaust purification catalyst is kept uniform and low pressure loss is maintained at the same level as before. It becomes possible to do.

また、ケーシングの前端から分散板までの距離を従来より短くしても、分散板の中央部分が排気浄化触媒側へ向けて張り出しているので、この中央部分に突き当たる位置まで延在する入口パイプを比較的長く保つことが可能となり、該入口パイプにおける散気孔の数を極力減らさないようにして開口率を従来と同程度に維持することが可能となる。   Even if the distance from the front end of the casing to the dispersion plate is made shorter than before, the central portion of the dispersion plate protrudes toward the exhaust purification catalyst side. It becomes possible to keep it comparatively long, and it becomes possible to maintain an aperture ratio to the same extent as before, without reducing the number of the diffuser holes in this inlet pipe as much as possible.

更に、入口パイプのケーシング内に入り込んだ部位に、排気浄化触媒側へ向けて徐々に縮径するテーパ形状を付したことにより、分散板の中央部分に対して突き当たる入口パイプの先端部の径が小さくなるので、これに合せて分散板の中央部分の面積を縮小することが可能となり、分散板のより多くの部分をテーパ曲面として面積を増やし、開口率の更なる向上に寄与せしめることが可能となる。 Further, in the site that has entered the inside of the inlet mouth pipe casing, by given the diameter decreases gradually tapering shape toward the exhaust purification catalyst side, the tip portion of the inlet pipe impinging against the central portion of the dispersion plate Therefore, the area of the central part of the dispersion plate can be reduced accordingly, and the larger part of the dispersion plate is made into a tapered curved surface, thereby contributing to further improvement of the aperture ratio. It becomes possible.

上記した本発明の排気浄化装置によれば、下記の如き種々の優れた効果を奏し得る。   According to the exhaust emission control device of the present invention described above, various excellent effects as described below can be obtained.

（Ｉ）本発明の請求項１に記載の発明によれば、酸化触媒等の排気浄化触媒に導入される排気ガスの流速分布の均一化と低圧損化を良好に保ちながらケーシングのコンパクト化を実現することができ、これにより車両への搭載性を従来より大幅に改善することができる。   (I) According to the invention described in claim 1 of the present invention, the casing can be made compact while the flow velocity distribution of the exhaust gas introduced into the exhaust purification catalyst such as an oxidation catalyst is made uniform and the low pressure loss is kept good. This makes it possible to significantly improve the mountability on the vehicle.

（ＩＩ）本発明の請求項１に記載の発明によれば、入口パイプの先端部の径を小さくして分散板の中央部分の面積を縮小することができるので、分散板のより多くの部分をテーパ曲面として面積を増やし、開口率の更なる向上に寄与せしめることができる。 According to the invention described in claim 1, (II) the present invention, it is possible to diameter of the tip portion of the inlet pipe is reduced to reduce the area of the central portion of the dispersion plate, a greater portion of the dispersion plate As a tapered curved surface, the area can be increased and the aperture ratio can be further improved.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明を実施する形態の一例を示すもので、先に説明した図２のものと略同様に、排気管３の途中に介装したケーシング４内に、前段の酸化触媒２（排気ガスを通過させて浄化する排気浄化触媒）とパティキュレートフィルタ１とを直列に配置すると共に、前記酸化触媒２の入側で排気ガス６の流れを拡散せしめる分散板５を備えた排気浄化装置に関し、前記分散板５を酸化触媒２側へ向けて中央部分９を張り出すようにした擂鉢状に形成し、前記ケーシング４の入側には、上流側の排気管３からの排気ガス６を導き入れる入口パイプ７を装備して前記分散板５の中央部分９に突き当たる位置まで延在せしめ、この入口パイプ７のケーシング４内に入り込んだ部位に、酸化触媒２側へ向けて徐々に縮径するテーパ形状を付した上で多数の散気孔７ａを開口するようにしてある。   FIG. 1 shows an example of an embodiment for carrying out the present invention. In the same manner as in FIG. 2 described above, an oxidation catalyst 2 (exhaust gas) in a preceding stage is disposed in a casing 4 interposed in the middle of an exhaust pipe 3. (Exhaust gas purifying catalyst for purifying gas by passing through) and particulate filter 1 are arranged in series, and the exhaust gas purifying apparatus is provided with a dispersion plate 5 for diffusing the flow of exhaust gas 6 on the inlet side of the oxidation catalyst 2. The dispersion plate 5 is formed in a mortar shape so that the central portion 9 protrudes toward the oxidation catalyst 2 side, and exhaust gas 6 from the upstream exhaust pipe 3 is guided to the inlet side of the casing 4. Equipped with an inlet pipe 7 to be inserted and extended to a position where it abuts against the central portion 9 of the dispersion plate 5, and gradually reduces the diameter toward the oxidation catalyst 2 side at a portion of the inlet pipe 7 that enters the casing 4. Many with a tapered shape The diffusing pores 7a are so as to open.

而して、このように構成すれば、分散板５が酸化触媒２側へ向けて中央部分９を張り出すようにした擂鉢状に形成されているので、同じ流路断面内でも従来の円盤状の分散板５と比較して面積が大きく確保されることになり、散気孔５ａを増やして開口率を上げることで分散性の向上と圧損の低下が図られる。   Thus, with this configuration, the dispersion plate 5 is formed in a mortar shape that projects the central portion 9 toward the oxidation catalyst 2 side. Compared with the dispersion plate 5, the area is ensured to be large, and the dispersibility is improved and the pressure loss is reduced by increasing the air diffusion holes 5 a and increasing the aperture ratio.

しかも、分散板５の中央部分９が酸化触媒２に近づくものの、外周側に向かうにつれて酸化触媒２から離間して十分な距離Ｌ1が確保されるようになっており、分散板５が擂鉢状となっていることにより排気ガス６の通過方向が外周側に向けられて外周側への拡散が促されるようにもなっているので、このような作用によっても排気ガス６の分散性が向上されることになる。 In addition, although the central portion 9 of the dispersion plate 5 approaches the oxidation catalyst 2, the dispersion plate 5 is separated from the oxidation catalyst 2 toward the outer peripheral side so that a sufficient distance L 1 is secured, and the dispersion plate 5 is in a bowl shape. As a result, the passage direction of the exhaust gas 6 is directed to the outer peripheral side and the diffusion to the outer peripheral side is promoted. Therefore, the dispersibility of the exhaust gas 6 is also improved by such an action. Will be.

この結果、分散板５から酸化触媒２の入側端面までの距離Ｌ1（ここに図示している例では、酸化触媒２の入側端面から最も離間した分散板５の背面位置を該分散板５の位置として規定しており、これは従来の図２においても同じように規定している）を従来より短縮しても、酸化触媒２に導入される排気ガス６の流速分布の均一化と低圧損化を従来と同程度に維持することが可能となる。 As a result, the distance L 1 from the dispersion plate 5 to the entry side end surface of the oxidation catalyst 2 (in the example shown here, the position of the back surface of the dispersion plate 5 farthest from the entry side end surface of the oxidation catalyst 2 is the dispersion plate. 5), which is defined in the same manner in the conventional FIG. 2), even if it is shortened from the prior art, the flow velocity distribution of the exhaust gas 6 introduced into the oxidation catalyst 2 is made uniform. It becomes possible to maintain the low pressure loss at the same level as before.

また、ケーシング４の前端（ケーシング４の分散板５より前方の部分を構成している鏡板８の最前端）から分散板５までの距離Ｌ2を従来より短くしても、分散板５の中央部分９が酸化触媒２側へ向けて張り出しているので、この中央部分９に突き当たる位置まで延在する入口パイプ７を比較的長く保つことが可能となり、該入口パイプ７における散気孔７ａの数を極力減らさないようにして開口率を従来と同程度に維持することが可能となる。 Further, even if the distance L 2 from the front end of the casing 4 (the front end of the end plate 8 constituting the front part of the casing 4 in front of the dispersion plate 5) to the dispersion plate 5 is shorter than before, the center of the dispersion plate 5 is maintained. Since the portion 9 protrudes toward the oxidation catalyst 2 side, it is possible to keep the inlet pipe 7 extending to a position where it abuts against the central portion 9 relatively long, and the number of air diffusion holes 7a in the inlet pipe 7 can be reduced. It is possible to maintain the aperture ratio at the same level as before without reducing it as much as possible.

従って、上記形態例によれば、距離Ｌ1，距離Ｌ2を従来より短くしても、酸化触媒２に導入される排気ガス６の流速分布の均一化と低圧損化を良好に保ちながらケーシング４のコンパクト化を実現することができ、これにより車両への搭載性を従来より大幅に改善することができる。 Therefore, according to the above-described embodiment, the casing maintains the uniform flow velocity distribution and low pressure loss of the exhaust gas 6 introduced into the oxidation catalyst 2 even when the distances L 1 and L 2 are shorter than the conventional one . 4 can be made compact, and this makes it possible to significantly improve the mounting property on a vehicle.

更に、本形態例においては、入口パイプ７のケーシング４内に入り込んだ部位に、酸化触媒２側へ向けて徐々に縮径するテーパ形状を付したことによって、分散板５の中央部分９に対して突き当たる入口パイプ７の先端部の径が小さくなり、これに合せて分散板５の中央部分９の面積を縮小することができるので、分散板５のより多くの部分をテーパ曲面として面積を増やし、開口率の更なる向上に寄与せしめることができる。   Furthermore, in the present embodiment, the portion of the inlet pipe 7 that has entered the casing 4 is tapered so that the diameter gradually decreases toward the oxidation catalyst 2 side. Since the diameter of the tip portion of the inlet pipe 7 that abuts is reduced and the area of the central portion 9 of the dispersion plate 5 can be reduced accordingly, the area of the dispersion plate 5 is increased as a tapered curved surface. This can contribute to further improvement of the aperture ratio.

尚、本発明の排気浄化装置は、上述の形態例にのみ限定されるものではなく、排気管途中のケーシング内に収容される排気浄化触媒は、必ずしもパティキュレートフィルタの前段に付帯装備される酸化触媒に限定されるものではなく、パティキュレートフィルタ自体を担体とした酸化触媒であっても良いし、ＮＯx吸蔵還元触媒、選択還元型触媒、三元触媒等といった様々な触媒であっても良いこと、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Note that the exhaust purification apparatus of the present invention is not limited to the above-described embodiment, and the exhaust purification catalyst housed in the casing in the middle of the exhaust pipe is not necessarily oxidized in the front stage of the particulate filter. The catalyst is not limited to the catalyst, and may be an oxidation catalyst using the particulate filter itself as a carrier, or may be various catalysts such as a NOx occlusion reduction catalyst, a selective reduction catalyst, and a three-way catalyst. Of course, various modifications can be made without departing from the scope of the present invention.

本発明を実施する形態の一例を示す断面図である。It is sectional drawing which shows an example of the form which implements this invention. 従来例を示す断面図である。It is sectional drawing which shows a prior art example.

符号の説明Explanation of symbols

２ 酸化触媒（排気浄化触媒）
３ 排気管
４ ケーシング
５ 分散板
６ 排気ガス
７ 入口パイプ
７ａ 散気孔
９ 中央部分 2 Oxidation catalyst (exhaust gas purification catalyst)
3 Exhaust pipe 4 Casing 5 Dispersing plate 6 Exhaust gas 7 Inlet pipe 7a Aeration hole 9 Center

Claims (1)

排気管の途中に介装したケーシング内に、排気ガスを通過させて浄化する排気浄化触媒と、該排気浄化触媒の入側で排気ガスの流れを拡散せしめる分散板とを備えた排気浄化装置において、前記分散板を排気浄化触媒側へ向けて中央部分を張り出すようにした擂鉢状に形成し、前記ケーシングの入側に装備されて排気管からの排気ガスを導き入れる入口パイプを前記分散板の中央部分に突き当たる位置まで延在し、前記入口パイプのケーシング内に入り込んだ部位に多数の散気孔を開口し且つ排気浄化触媒側へ向けて徐々に縮径するテーパ形状を付したことを特徴とする排気浄化装置。 In an exhaust purification device comprising an exhaust purification catalyst for purifying exhaust gas through a casing interposed in the middle of an exhaust pipe, and a dispersion plate for diffusing the flow of exhaust gas on the inlet side of the exhaust purification catalyst The dispersion plate is formed in a mortar shape with a central portion protruding toward the exhaust purification catalyst side, and an inlet pipe that is provided on the inlet side of the casing and guides exhaust gas from the exhaust pipe Extending to the position where it hits the central part of the inlet pipe , a large number of air diffusion holes are opened in the part that entered the casing of the inlet pipe , and a tapered shape that gradually reduces the diameter toward the exhaust purification catalyst side is attached . A featured exhaust purification device.
JP2007276248A 2007-10-24 2007-10-24 Exhaust purification device Expired - Fee Related JP5112815B2 (en)

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