JP6204617B2 - Exhaust purification device - Google Patents

Exhaust purification device Download PDF

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JP6204617B2
JP6204617B2 JP2016564504A JP2016564504A JP6204617B2 JP 6204617 B2 JP6204617 B2 JP 6204617B2 JP 2016564504 A JP2016564504 A JP 2016564504A JP 2016564504 A JP2016564504 A JP 2016564504A JP 6204617 B2 JP6204617 B2 JP 6204617B2
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catalyst
center line
exhaust
recess
exhaust gas
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JPWO2016098194A1 (en
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泰史 梅野
泰史 梅野
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Futaba Industrial Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

本発明は、排気流路に触媒が設けられた排気浄化装置に関する。   The present invention relates to an exhaust purification device in which a catalyst is provided in an exhaust passage.

内燃機関から排出される排ガスを浄化する装置として、排気流路に触媒を配設した排気浄化装置が知られている。このような排気浄化装置においては、例えば排気流路における中央部の流速と比較して外周部の流速が低くなるなど、触媒に流入する排ガスの流速分布に偏りが生じてしまう問題があった。   As an apparatus for purifying exhaust gas discharged from an internal combustion engine, an exhaust purification apparatus in which a catalyst is disposed in an exhaust passage is known. In such an exhaust purification device, there is a problem that the flow velocity distribution of the exhaust gas flowing into the catalyst is biased, for example, the flow velocity at the outer peripheral portion is lower than the flow velocity at the central portion in the exhaust flow path.

このような問題を解決するために、触媒から流出した排ガスの流れの一部を阻害する阻害部材を触媒の下流側に設けることにより、触媒へ流入する排ガスの流速分布の偏りを軽減させるようにした排気浄化装置が提案されている（特許文献１参照）。   In order to solve such a problem, by providing an inhibiting member that inhibits part of the flow of the exhaust gas flowing out from the catalyst on the downstream side of the catalyst, the deviation of the flow velocity distribution of the exhaust gas flowing into the catalyst is reduced. An exhaust emission control device has been proposed (see Patent Document 1).

特開２０１４−１２２５９６号公報JP 2014-122596 A

前述した特許文献１に記載の構成は、中心軸方向から見た形状が真円状の触媒を前提としており、中心軸方向から見て触媒の形状を一回り小さく縮小した真円状の凹部で排ガスの流れの一部を阻害する。しかしながら、例えば楕円状など、中心軸方向から見て長手方向が規定される形状の触媒に対して特に好適な阻害部材については考慮されていなかった。   The configuration described in Patent Document 1 described above is premised on a catalyst whose shape when viewed from the central axis direction is a perfect circle, and is a circular recess that is reduced in size by a small size when viewed from the central axis direction. It obstructs part of the flow of exhaust gas. However, an inhibitor member that is particularly suitable for a catalyst having a shape whose longitudinal direction is defined when viewed from the central axis direction, such as an elliptical shape, has not been considered.

本発明の一側面においては、中心軸方向から見て長手方向が規定される形状の触媒を備える排気浄化装置において、触媒へ流入する排ガスの流速分布の偏りを軽減させる効果を高くすることが望ましい。   In one aspect of the present invention, in an exhaust gas purification apparatus including a catalyst having a shape whose longitudinal direction is defined when viewed from the central axis direction, it is desirable to increase the effect of reducing the deviation in the flow velocity distribution of exhaust gas flowing into the catalyst. .

本発明の一側面は、排気浄化装置であって、排気流路に設けられ、排ガスを浄化する触媒と、排気流路に設けられ、排ガスの流れの一部を阻害することによって、触媒へ流入する排ガスの流速分布の偏りを軽減させる阻害部材と、を備える。阻害部材は、排気流路の上流側が凹んだ凹部と、触媒に対する所定の位置に凹部を支持する支持部とを有し、排ガスの流れの一部を凹部で阻害する。凹部は、当該凹部の中心軸方向から見て長手方向が規定される形状であって、その長手方向に沿った中心線である第１の凹部中心線及び第１の凹部中心線と直交する中心線である第２の凹部中心線のいずれを対称軸にしても線対称となる形状である。触媒は、当該触媒の中心軸方向から見て長手方向が規定される形状であって、その長手方向に沿った中心線である第１の触媒中心線及び第１の触媒中心線と直交する中心線である第２の触媒中心線のいずれを対称軸にしても線対称となる形状である。阻害部材は、触媒に対し、第１の凹部中心線と第１の触媒中心線とが互いに直交する向きに配置される。   One aspect of the present invention is an exhaust emission control device, which is provided in an exhaust passage and is provided with an exhaust gas purification catalyst, and is provided in the exhaust passage and inhibits part of the exhaust gas flow to flow into the catalyst. And an inhibiting member that reduces unevenness in the flow velocity distribution of exhaust gas. The inhibiting member has a recessed portion that is recessed on the upstream side of the exhaust passage and a support portion that supports the recessed portion at a predetermined position with respect to the catalyst, and inhibits a part of the flow of exhaust gas at the recessed portion. The concave portion has a shape in which the longitudinal direction is defined when viewed from the central axis direction of the concave portion, and the first concave portion center line that is the central line along the longitudinal direction and the center perpendicular to the first concave portion center line. This is a shape that is line symmetric even if any of the second recess center lines that are lines is the axis of symmetry. The catalyst has a shape in which a longitudinal direction is defined when viewed from the central axis direction of the catalyst, and a first catalyst center line that is a center line along the longitudinal direction and a center orthogonal to the first catalyst center line The shape is symmetrical with respect to any of the second catalyst center lines, which are lines. The inhibiting member is disposed in a direction in which the first recess center line and the first catalyst center line are orthogonal to each other with respect to the catalyst.

このような構成によれば、中心軸方向から見て長手方向が規定される形状の触媒へ流入する排ガスの流速分布の偏りを軽減させる効果を高くすることができる。なお、上記構成でいう「直交」とは、厳密な角度が要求されるものではなく、効果が得られる範囲であればよい。   According to such a configuration, it is possible to increase the effect of reducing the deviation of the flow velocity distribution of the exhaust gas flowing into the catalyst having a shape whose longitudinal direction is defined when viewed from the central axis direction. The term “orthogonal” as used in the above configuration does not require a strict angle, but may be in a range where an effect can be obtained.

上記構成において、凹部は、凹部の中心軸方向から見て、第１の凹部中心線に沿った位置における凹部の幅が、中心に近いほど大きくなる形状であってもよい。このような構成によれば、例えば第１の凹部中心線に沿った位置における凹部の幅が一定である場合と比較して、触媒へ流入する排ガスの流速分布の偏りを軽減させる効果を高くすることができる。   In the above configuration, the concave portion may have a shape in which the width of the concave portion at a position along the first concave portion center line becomes larger as it is closer to the center when viewed from the central axis direction of the concave portion. According to such a configuration, for example, compared with a case where the width of the recess at a position along the first recess center line is constant, the effect of reducing the unevenness in the flow velocity distribution of the exhaust gas flowing into the catalyst is increased. be able to.

上記構成において、触媒は、触媒の中心軸方向から見て、第１の触媒中心線に沿った位置における触媒の幅が、中心に近いほど大きくなる形状であってもよい。
上記構成において、阻害部材は、第１の凹部中心線に沿った凹部の長さが、第２の触媒中心線に沿った触媒の長さよりも短くてもよい。このような構成によれば、触媒における第２の触媒中心線に沿った方向の端部に、凹部により排ガスの流れが阻害されない隙間が形成される。このため、触媒へ流入する排ガスの流速分布の偏りを軽減しつつ、阻害部材を設けることによる圧力損失の上昇を抑制することができる。In the above-described configuration, the catalyst may have a shape in which the width of the catalyst at a position along the first catalyst center line is larger as it is closer to the center when viewed from the central axis direction of the catalyst.
In the above-described configuration, the length of the recess along the first recess center line may be shorter than the length of the catalyst along the second catalyst center line in the inhibition member. According to such a configuration, a gap is formed at the end of the catalyst in the direction along the second catalyst center line so that the flow of exhaust gas is not hindered by the recess. For this reason, it is possible to suppress an increase in pressure loss due to the provision of the blocking member while reducing the uneven flow velocity distribution of the exhaust gas flowing into the catalyst.

上記構成において、阻害部材は、触媒よりも排気流路の下流側に配置されてもよい。このような構成によれば、触媒へ流入する排ガスの流速分布の偏りを軽減させるための何らかの部材を上流側に設ける必要が無い、又は、その必要性が低い。したがって、触媒へ流入する排ガスの温度低下を抑制しつつ、触媒へ流入する排ガスの流速分布の偏りを軽減することが可能となる。   In the above configuration, the inhibition member may be disposed on the downstream side of the exhaust flow path with respect to the catalyst. According to such a configuration, there is no need to provide any member on the upstream side for reducing the uneven flow velocity distribution of the exhaust gas flowing into the catalyst, or the necessity thereof is low. Therefore, it is possible to reduce the uneven flow velocity distribution of the exhaust gas flowing into the catalyst while suppressing the temperature drop of the exhaust gas flowing into the catalyst.

上記構成において、阻害部材は、触媒よりも排気流路の上流側に配置されてもよい。このような構成によれば、阻害部材の凹部が、触媒へ流入する前の排ガスに直接作用するため、触媒へ流入する排ガスの流速分布を好適に調整しやすくすることができる。   In the above configuration, the inhibition member may be disposed upstream of the catalyst in the exhaust flow path. According to such a configuration, since the concave portion of the inhibition member directly acts on the exhaust gas before flowing into the catalyst, it is possible to easily adjust the flow velocity distribution of the exhaust gas flowing into the catalyst.

第１実施形態の排気浄化装置の構成を示す断面図である。It is sectional drawing which shows the structure of the exhaust gas purification apparatus of 1st Embodiment. 図１におけるII−II断面図である。It is II-II sectional drawing in FIG. 図３Ａは第１実施形態の阻害部材を触媒側から見た斜視図、図３Ｂはその阻害部材を触媒側とは反対側から見た斜視図である。FIG. 3A is a perspective view of the inhibition member of the first embodiment as viewed from the catalyst side, and FIG. 3B is a perspective view of the inhibition member as viewed from the side opposite to the catalyst side. 図４Ａは第１実施形態の阻害部材の背面図、図４Ｂは図４ＡのIVＢ−IVＢ断面図、図４Ｃは図４ＡのIVＣ−IVＣ断面図である。4A is a rear view of the obstruction member of the first embodiment, FIG. 4B is a sectional view taken along the line IVB-IVB in FIG. 4A, and FIG. 4C is a sectional view taken along the line IVC-IVC in FIG. 第２実施形態の排気浄化装置の構成を示す断面図である。It is sectional drawing which shows the structure of the exhaust gas purification apparatus of 2nd Embodiment.

１００,２００…排気浄化装置、２…流路部材、２Ａ…第１の管部、２Ｂ…第２の管部、２Ｃ…第３の管部、２Ｄ…第４の管部、２Ｅ…第５の管部、３…触媒、４，５，６，７…中心線、１０…阻害部材、１１…凹部、１２…支持部、１１１…端部、１１２…底面、１１３…立ち上がり面、Ａ…中心軸。   DESCRIPTION OF SYMBOLS 100,200 ... Exhaust gas purification apparatus, 2 ... Flow path member, 2A ... 1st pipe part, 2B ... 2nd pipe part, 2C ... 3rd pipe part, 2D ... 4th pipe part, 2E ... 5th Tube portion, 3 ... catalyst, 4,5,6,7 ... center line, 10 ... inhibiting member, 11 ... recessed portion, 12 ... support portion, 111 ... end portion, 112 ... bottom surface, 113 ... rise surface, A ... center axis.

以下、本発明の例示的な実施形態について図面を参照しながら説明する。
［第１実施形態］
図１に示す排気浄化装置１００は、自動車の内燃機関（例えばガソリンエンジン）から排出された排ガスを浄化するための装置である。図１における矢印は、排ガスの流れる方向を示す。Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
An exhaust purification device 100 shown in FIG. 1 is a device for purifying exhaust gas discharged from an internal combustion engine (for example, a gasoline engine) of an automobile. The arrows in FIG. 1 indicate the direction in which the exhaust gas flows.

排気浄化装置１００は、流路部材２と、触媒３と、阻害部材１０と、を備える。
流路部材２は、内燃機関から排出された排ガスを自動車の外部へ導くための排気流路の一部を形成する。流路部材２は、上流側から順に、第１の管部２Ａと、第２の管部２Ｂと、第３の管部２Ｃと、第４の管部２Ｄと、第５の管部２Ｅと、を備える。なお、これらは説明の便宜上の区分である。流路部材２を構成する部品の区分は、特に限定されない。The exhaust purification device 100 includes a flow path member 2, a catalyst 3, and an inhibition member 10.
The flow path member 2 forms a part of an exhaust flow path for guiding the exhaust gas discharged from the internal combustion engine to the outside of the automobile. The flow path member 2 includes, in order from the upstream side, the first tube portion 2A, the second tube portion 2B, the third tube portion 2C, the fourth tube portion 2D, and the fifth tube portion 2E. . These are classifications for convenience of explanation. The division of the parts constituting the flow path member 2 is not particularly limited.

第１の管部２Ａは、直線状の円管部である。
第３の管部２Ｃは、第１の管部２Ａの中心軸Ａと同軸に設けられた直線状の楕円管部である。第３の管部２Ｃは、第１の管部２Ａには収容されない大きさの楕円柱状の触媒３を収容するために、少なくとも楕円の長軸に沿った内径が第１の管部２Ａの内径よりも大きく形成されている。第１の管部２Ａと第３の管部２Ｃとは、排気流路の内径を徐々に拡大するための拡径流路を形成する第２の管部２Ｂによって、なだらかに連結されている。The first tube portion 2A is a straight circular tube portion.
The third tube portion 2C is a linear elliptic tube portion provided coaxially with the central axis A of the first tube portion 2A. The third tube portion 2C has at least an inner diameter along the major axis of the ellipse to accommodate the elliptical columnar catalyst 3 having a size that cannot be accommodated in the first tube portion 2A. It is formed larger than. The first tube portion 2A and the third tube portion 2C are gently connected by a second tube portion 2B that forms an enlarged flow passage for gradually expanding the inner diameter of the exhaust flow passage.

第５の管部２Ｅは、第３の管部２Ｃの中心軸Ａと同軸に設けられた直線状の円管部である。第５の管部２Ｅは、その内径が、少なくとも第３の管部２Ｃの楕円の長軸に沿った内径よりも小さく形成されている。この例では、第１の管部２Ａと第５の管部２Ｅとは、内径が同じである。第３の管部２Ｃと第５の管部２Ｅとは、排気流路の内径を徐々に縮小するための縮径流路を形成する第４の管部２Ｄによって、なだらかに連結されている。   The fifth tube portion 2E is a straight circular tube portion provided coaxially with the central axis A of the third tube portion 2C. The inner diameter of the fifth pipe portion 2E is smaller than at least the inner diameter along the major axis of the ellipse of the third pipe portion 2C. In this example, the first tube portion 2A and the fifth tube portion 2E have the same inner diameter. The 3rd pipe part 2C and the 5th pipe part 2E are gently connected by 4th pipe part 2D which forms the diameter-reduction channel for reducing the internal diameter of an exhaust flow path gradually.

つまり、流路部材２は、触媒３の上流側に拡径流路を有し触媒３の下流側に縮径流路を有する排気流路を形成する。
触媒３は、白金、パラジウム、ロジウム等の貴金属を担持したセラミック製の担体である。担体は、外形が楕円柱状のフィルタであり、流入面（上流側端面）に流入した排ガスが流出面（下流側端面）から流出するように構成されている。排ガス中のＨＣ，ＣＯ，ＮＯｘ等は、触媒３を通過する際に、酸化反応又は酸化・還元反応により浄化される。触媒３は、第３の管部２Ｃの内側において、第３の管部２Ｃの中心軸Ａと同軸に設けられている。図２に示すように、触媒３は、中心軸Ａの方向から見た形状が楕円状であり、長手方向に沿った中心線（長軸）４と、中心線４と直交する短手方向に沿った中心線（短軸）５とのいずれを対称軸にしても線対称となる形状である。That is, the flow path member 2 forms an exhaust flow path having an enlarged diameter flow path on the upstream side of the catalyst 3 and a reduced diameter flow path on the downstream side of the catalyst 3.
The catalyst 3 is a ceramic carrier that supports a noble metal such as platinum, palladium, or rhodium. The carrier is a filter having an elliptical columnar shape, and is configured such that the exhaust gas flowing into the inflow surface (upstream side end surface) flows out from the outflow surface (downstream side end surface). HC, CO, NOx, etc. in the exhaust gas are purified by oxidation reaction or oxidation / reduction reaction when passing through the catalyst 3. The catalyst 3 is provided coaxially with the central axis A of the third pipe portion 2C inside the third pipe portion 2C. As shown in FIG. 2, the catalyst 3 has an elliptical shape when viewed from the direction of the central axis A, and has a center line (long axis) 4 along the longitudinal direction and a short direction perpendicular to the center line 4. The shape is axisymmetric even if any of the center line (short axis) 5 along the axis is a symmetric axis.

阻害部材１０は、排気流路における触媒３の上流側及び下流側のうち下流側にのみ設けられている。
図３Ａ−３Ｂ，４Ａ−４Ｃに示すように、阻害部材１０は、凹部１１と、２つの支持部１２と、を備える。The inhibition member 10 is provided only on the downstream side of the upstream side and the downstream side of the catalyst 3 in the exhaust passage.
As shown in FIGS. 3A-3B and 4A-4C, the inhibition member 10 includes a recess 11 and two support portions 12.

凹部１１は、貫通孔の形成されていない容器状の部分であって、排気流路の上流側（触媒３の流出面に対向する側）が凹んでいる。凹部１１は、第３の管部２Ｃの内側において、触媒３の中心軸Ａと同軸に設けられている。また、凹部１１は、中心軸Ａの方向から見た形状が楕円状であり、その長手方向に沿った中心線（長軸）６と、中心線６と直交する短手方向に沿った中心線（短軸）７とのいずれを対称軸にしても線対称となる形状である。凹部１１の外縁部には、排気流路の上流側へ立ち上がるように屈曲した端部１１１が形成されている。換言すれば、凹部１１を形成する面における端部１１１の外縁部には、底面１１２に対して立ち上がった立ち上がり面１１３が形成されている。立ち上がり面１１３は、底面１１２と比較して、中心軸Ａに沿った直線に対する角度が小さい。   The recess 11 is a container-like portion in which no through hole is formed, and the upstream side of the exhaust passage (the side facing the outflow surface of the catalyst 3) is recessed. The concave portion 11 is provided coaxially with the central axis A of the catalyst 3 inside the third pipe portion 2C. The concave portion 11 has an elliptical shape when viewed from the direction of the center axis A, and a center line (long axis) 6 along the longitudinal direction and a center line along the short direction perpendicular to the center line 6. (Short Axis) 7 is a shape that is line symmetric regardless of which of 7 is the axis of symmetry. An end 111 that is bent so as to rise to the upstream side of the exhaust passage is formed at the outer edge of the recess 11. In other words, a rising surface 113 that rises with respect to the bottom surface 112 is formed at the outer edge portion of the end portion 111 on the surface that forms the recess 11. The rising surface 113 has a smaller angle with respect to the straight line along the central axis A than the bottom surface 112.

２つの支持部１２は、帯状の板がＬ字状に折り曲げられた形状の部分であって、凹部１１の長手方向両端位置にそれぞれ設けられている。支持部１２における折曲部よりも先端側の外面は、第３の管部２Ｃの内周面の形状に対応した曲面状（中心軸Ａの方向から見た形状が楕円の一部である円弧状）に設計され、第３の管部２Ｃの内周面に溶接等で接合される。なお、本実施形態では、面の向きが中心軸Ａに平行なＬ字状の支持部１２を例示したが、これに限定されるものではなく、例えば、中心軸Ａと交わる（例えば直交する）向きに面が形成された構成であってもよい。   The two support portions 12 are portions in which a belt-like plate is bent in an L shape, and are provided at both ends of the recess 11 in the longitudinal direction. The outer surface on the tip side of the bent portion of the support portion 12 is a curved surface corresponding to the shape of the inner peripheral surface of the third tube portion 2C (a circle whose shape viewed from the direction of the central axis A is a part of an ellipse). Arc-shaped) and joined to the inner peripheral surface of the third pipe portion 2C by welding or the like. In the present embodiment, the L-shaped support portion 12 whose surface direction is parallel to the central axis A is exemplified, but the present invention is not limited to this, and for example, intersects the central axis A (for example, orthogonal). The structure in which the surface was formed in direction may be sufficient.

支持部１２は、触媒３に対する所定の位置（本実施形態では、触媒３の流出面中央部と対向する位置）に凹部１１を支持する機能を有する。具体的には、図１に示すように、凹部１１は、中心軸Ａに沿った位置が、触媒３の流出面に対して所定の間隔を空けた位置となるように配置される。また、図２に示すように、凹部１１は、中心軸Ａの方向から見て、触媒３に対し、それぞれの長手方向に沿った中心線（中心線６及び中心線４）が互いに直交する向きに配置されている。特に本実施形態では、中心軸Ａの方向から見て、凹部１１の短手方向に沿った中心線７が触媒３の長手方向に沿った中心線４と重なり、凹部１１の長手方向に沿った中心線６が触媒３の短手方向に沿った中心線５と重なるように、凹部１１が配置されている。   The support portion 12 has a function of supporting the concave portion 11 at a predetermined position with respect to the catalyst 3 (in this embodiment, a position facing the center of the outflow surface of the catalyst 3). Specifically, as shown in FIG. 1, the recess 11 is arranged such that the position along the central axis A is at a predetermined distance from the outflow surface of the catalyst 3. In addition, as shown in FIG. 2, the recess 11 is oriented so that the center lines (center line 6 and center line 4) along the respective longitudinal directions are perpendicular to the catalyst 3 when viewed from the direction of the center axis A. Is arranged. In particular, in this embodiment, when viewed from the direction of the central axis A, the center line 7 along the short direction of the recess 11 overlaps the center line 4 along the longitudinal direction of the catalyst 3, and extends along the longitudinal direction of the recess 11. The recess 11 is arranged so that the center line 6 overlaps the center line 5 along the short direction of the catalyst 3.

また、中心線６に沿った凹部１１の長さ（長径）は、中心線５に沿った触媒３の長さ（短径）よりも短い。つまり、凹部１１は、中心軸Ａの方向から見て、触媒３の流出面全域を覆う大きさではなく、その一部を覆う大きさである。そして、中心線６に沿った方向の凹部１１の両外側には、中心線５に沿った方向の触媒３の端部を通過する排ガスの流れが凹部１１によって阻害されない隙間が形成されている。なお、阻害部材１０を構成する凹部１１及び支持部１２は、説明の便宜上の区分であり、阻害部材１０を構成する部品の区分は特に限定されない。例えば、１枚の金属製の板材をプレス加工及び曲げ加工して凹部１１の半分及び１つの支持部１２を形成し、この部品を２つ合わせて溶接することにより、阻害部材１０を製造してもよい。また、例えば、１枚の金属製の板材をプレス加工及び曲げ加工して、凹部及び支持部を一体成形することにより、阻害部材を製造してもよい。   Further, the length (major axis) of the recess 11 along the center line 6 is shorter than the length (minor axis) of the catalyst 3 along the center line 5. That is, the recess 11 is not large enough to cover the entire outflow surface of the catalyst 3 as viewed from the direction of the central axis A, but large enough to cover a part thereof. Further, on both outer sides of the recess 11 in the direction along the center line 6, a gap is formed in which the flow of exhaust gas that passes through the end of the catalyst 3 in the direction along the center line 5 is not inhibited by the recess 11. In addition, the recessed part 11 and the support part 12 which comprise the obstruction member 10 are divisions for convenience of explanation, and the division of the parts which comprise the obstruction member 10 is not specifically limited. For example, the obstruction member 10 is manufactured by pressing and bending a single metal plate material to form a half of the recess 11 and one support portion 12 and welding the two together. Also good. Further, for example, the inhibition member may be manufactured by pressing and bending a single metal plate and integrally forming the concave portion and the support portion.

以上詳述した第１実施形態によれば、以下の効果が得られる。
（Ａ１）排気浄化装置１００において、阻害部材１０（具体的には凹部１１）は、触媒３に対し、それぞれの長手方向に沿った中心線（中心線６及び中心線４）が互いに直交する向きに配置されている。したがって、排気浄化装置１００によれば、中心軸Ａの方向から見た形状が楕円状の触媒３へ流入する排ガスの流速分布の偏りを軽減させる効果を高くすることができる。According to the first embodiment described in detail above, the following effects can be obtained.
(A1) In the exhaust purification apparatus 100, the inhibiting member 10 (specifically, the recess 11) is oriented so that the center lines (center line 6 and center line 4) along the respective longitudinal directions are perpendicular to the catalyst 3. Is arranged. Therefore, according to the exhaust gas purification apparatus 100, it is possible to increase the effect of reducing the deviation in the flow velocity distribution of the exhaust gas flowing into the catalyst 3 having an elliptical shape when viewed from the direction of the central axis A.

すなわち、例えば、凹部１１が、触媒３に対し、それぞれの長手方向に沿った中心線が平行（重なる場合も含む。）となる向きに配置されている場合、触媒３へ流入する排ガスの流量が、触媒３の短手方向（短軸方向）に偏りやすい。つまり、前述した特許文献１に記載の構成と同様の発想で、中心軸Ａの方向から見て触媒３の形状を一回り小さく縮小した楕円状の凹部１１で排ガスの流れの一部を阻害するように構成しても、触媒３へ流入する排ガスの流速分布の偏りは効果的に軽減されない。これは、長手方向が規定される触媒３の場合、排ガスが流入する排気流路の中心から近いほど排ガスの流量が大きくなりやすく、逆に排気流路の中心から遠いほど排ガスの流量が小さくなりやすいからであると考えられる。   That is, for example, when the concave portion 11 is arranged in a direction in which the center lines along the respective longitudinal directions are parallel (including overlapping) to the catalyst 3, the flow rate of the exhaust gas flowing into the catalyst 3 is The catalyst 3 tends to be biased in the short direction (short axis direction). That is, with the same idea as the configuration described in Patent Document 1 described above, a part of the flow of exhaust gas is obstructed by an elliptical recess 11 in which the shape of the catalyst 3 is slightly reduced as seen from the direction of the central axis A. Even if comprised in this way, the deviation of the flow velocity distribution of the exhaust gas flowing into the catalyst 3 is not effectively reduced. In the case of the catalyst 3 whose longitudinal direction is defined, the flow rate of the exhaust gas tends to increase as it is closer to the center of the exhaust flow channel into which the exhaust gas flows, and conversely, the flow rate of the exhaust gas decreases as it is farther from the center of the exhaust flow channel. It is thought that it is easy.

これに対し、本実施形態の排気浄化装置１００では、触媒３の短手方向である中心線５と凹部１１の長手方向である中心線６とが重なるように凹部１１が配置されている。このため、排気浄化装置１００では、触媒３の長手方向（長軸方向）と比較して排ガスの流量が大きくなりやすい短手方向（短軸方向）において排ガスの流れが阻害されやすくなる。したがって、排気浄化装置１００によれば、触媒３へ流入する排ガスの流速分布の偏りを軽減させる効果を高くすることができる。なお、このような効果は、中心線６と中心線４とが互いに直交する向きに配置されることに起因して得られるが、直交の程度は厳密である必要はなく、効果が得られる範囲であればよい。   On the other hand, in the exhaust purification apparatus 100 of the present embodiment, the recess 11 is arranged so that the center line 5 that is the short direction of the catalyst 3 and the center line 6 that is the longitudinal direction of the recess 11 overlap. For this reason, in the exhaust purification apparatus 100, the flow of the exhaust gas tends to be hindered in the short direction (short axis direction) in which the flow rate of the exhaust gas tends to be larger than the longitudinal direction (long axis direction) of the catalyst 3. Therefore, according to the exhaust gas purification apparatus 100, it is possible to increase the effect of reducing the deviation in the flow velocity distribution of the exhaust gas flowing into the catalyst 3. Such an effect is obtained because the center line 6 and the center line 4 are arranged in directions orthogonal to each other. However, the degree of orthogonality does not have to be exact, and the range in which the effect can be obtained. If it is.

（Ａ２）凹部１１は、中心軸Ａの方向から見た形状が楕円状であり、中心線６に沿った位置における凹部１１の幅が、中心に近いほど大きくなる形状である。したがって、例えば凹部の幅が一定である構成と比較して、排気流路における外周部に比べて排ガスの流量が大きくなりやすい中央部の流れがより阻害され、触媒３へ流入する排ガスの流速分布の偏りを軽減させる効果を高くすることができる。   (A2) The concave portion 11 has an elliptical shape when viewed from the direction of the central axis A, and has a shape in which the width of the concave portion 11 at a position along the center line 6 increases as it approaches the center. Therefore, for example, compared to a configuration in which the width of the recess is constant, the flow in the central portion where the flow rate of the exhaust gas tends to be larger than that in the outer peripheral portion in the exhaust flow path is further inhibited, and the flow velocity distribution of the exhaust gas flowing into the catalyst 3 The effect of reducing the bias can be increased.

（Ａ３）阻害部材１０は、中心線６に沿った凹部１１の長さが、中心線５に沿った触媒３の長さよりも短い。したがって、触媒３における中心線５に沿った方向の端部に、凹部１１により排ガスの流れが阻害されない隙間が形成される。このため、触媒３へ流入する排ガスの流速分布の偏りを軽減しつつ、阻害部材１０を設けることによる圧力損失の上昇を抑制することができる。   (A3) In the inhibiting member 10, the length of the recess 11 along the center line 6 is shorter than the length of the catalyst 3 along the center line 5. Accordingly, a gap is formed at the end of the catalyst 3 in the direction along the center line 5 so that the flow of exhaust gas is not hindered by the recess 11. For this reason, an increase in pressure loss due to the provision of the inhibiting member 10 can be suppressed while reducing the uneven flow velocity distribution of the exhaust gas flowing into the catalyst 3.

（Ａ４）阻害部材１０は、触媒３よりも排気流路の下流側に配置される。したがって、触媒３へ流入する排ガスの流速分布の偏りを軽減させるための何らかの部材を上流側に設ける必要が無い。よって、触媒３へ流入する排ガスの温度低下を抑制しつつ、触媒３へ流入する排ガスの流速分布の偏りを軽減することが可能となる。   (A4) The inhibiting member 10 is disposed downstream of the catalyst 3 from the exhaust flow path. Therefore, there is no need to provide any member on the upstream side for reducing the uneven flow velocity distribution of the exhaust gas flowing into the catalyst 3. Therefore, it is possible to reduce the uneven flow velocity distribution of the exhaust gas flowing into the catalyst 3 while suppressing the temperature drop of the exhaust gas flowing into the catalyst 3.

［第２実施形態］
図５に示すように、第２実施形態の排気浄化装置２００は、基本的な構成は第１実施形態の排気浄化装置１００と同様であり、前述した阻害部材１０が、排気流路における触媒３の上流側及び下流側のうち上流側にのみ設けられている点で相違する。その他の構成は同様であるため、説明を省略する。[Second Embodiment]
As shown in FIG. 5, the exhaust purification device 200 of the second embodiment has a basic configuration similar to that of the exhaust purification device 100 of the first embodiment, and the inhibition member 10 described above includes the catalyst 3 in the exhaust passage. It differs in that it is provided only on the upstream side of the upstream side and the downstream side. Since other configurations are the same, description thereof is omitted.

排気浄化装置２００において、凹部１１は、中心軸Ａに沿った位置が、触媒３の流入面に対して所定の間隔を空けた位置となるように配置される。具体的には、凹部１１は、触媒３の上流側において、凹んだ側の面が排気流路の上流側を向くように配置される。なお、中心軸Ａの方向から見た凹部１１の位置は第１実施形態と同様であり、触媒３に対し、それぞれの長手方向に沿った中心線（中心線６及び中心線４）が互いに直交する向きに配置されている。   In the exhaust emission control device 200, the recess 11 is arranged such that the position along the central axis A is at a predetermined distance from the inflow surface of the catalyst 3. Specifically, the concave portion 11 is arranged on the upstream side of the catalyst 3 so that the surface on the concave side faces the upstream side of the exhaust passage. In addition, the position of the recessed part 11 seen from the direction of the central axis A is the same as that of 1st Embodiment, and the center line (center line 6 and center line 4) along each longitudinal direction is mutually orthogonal with respect to the catalyst 3. It is arranged in the direction to be.

以上詳述した第２実施形態によれば、前述した第１実施形態の効果（Ａ１）−（Ａ３）に加え、以下の効果が得られる。
（Ｂ１）阻害部材１０は、触媒３よりも排気流路の上流側に配置される。したがって、阻害部材１０の凹部１１が、触媒３へ流入する前の排ガスに直接作用するため、触媒３へ流入する排ガスの流速分布を好適に調整しやすくすることができる。According to the second embodiment described in detail above, the following effects are obtained in addition to the effects (A1) to (A3) of the first embodiment described above.
(B1) The inhibiting member 10 is disposed upstream of the catalyst 3 in the exhaust passage. Therefore, since the concave portion 11 of the inhibition member 10 directly acts on the exhaust gas before flowing into the catalyst 3, the flow velocity distribution of the exhaust gas flowing into the catalyst 3 can be easily adjusted appropriately.

なお、上記各実施形態では、中心線４が第１の触媒中心線の一例に相当し、中心線５が第２の触媒中心線の一例に相当し、中心線６が第１の凹部中心線の一例に相当し、中心線７が第２の凹部中心線の一例に相当する。   In each of the above embodiments, the center line 4 corresponds to an example of the first catalyst center line, the center line 5 corresponds to an example of the second catalyst center line, and the center line 6 corresponds to the first recess center line. The center line 7 corresponds to an example of the second recess center line.

［他の実施形態］
以上、本発明の実施形態について説明したが、本発明は、上記実施形態に限定されることなく、種々の形態を採り得ることは言うまでもない。[Other Embodiments]
As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention can take a various form, without being limited to the said embodiment.

（Ｃ１）上記各実施形態の流路部材２は一例であり、これに限定されない。例えば、第１の管部２Ａ、第３の管部２Ｃ及び第５の管部２Ｅのうち少なくとも１つが、残りの少なくとも１つと中心軸が重ならないように配置されていてもよい。また例えば、第１の管部２Ａと第５の管部２Ｅとは、内径が異なっていてもよい。また例えば、第１の管部２Ａ及び第５の管部２Ｅの断面形状は円形状に限定されるものではなく、例えば楕円状や多角形状などであってもよい。   (C1) The flow path member 2 of each of the above embodiments is an example, and the present invention is not limited to this. For example, at least one of the first tube portion 2A, the third tube portion 2C, and the fifth tube portion 2E may be arranged so that the central axis does not overlap with the remaining at least one. Further, for example, the first tube portion 2A and the fifth tube portion 2E may have different inner diameters. For example, the cross-sectional shapes of the first tube portion 2A and the fifth tube portion 2E are not limited to a circular shape, and may be, for example, an elliptical shape or a polygonal shape.

（Ｃ２）上記各実施形態では、触媒３として、白金、パラジウム、ロジウム等の貴金属が担持されたセラミック製の三元触媒を例示したが、これに限定されるものではない。例えば、金属製の触媒を用いてもよい。また、ディーゼルパティキュレートフィルタ（Ｄｉｅｓｅｌ Ｐａｒｔｉｃｕｌａｔｅ Ｆｉｌｔｅｒ：ＤＰＦ）や、選択還元触媒（Ｓｅｌｅｃｔｉｖｅ Ｃａｔａｌｙｔｉｃ Ｒｅｄｕｃｔｉｏｎ：ＳＣＲ）などのように、三元触媒以外の触媒及びフィルタを用いてもよい。   (C2) In each of the above embodiments, the catalyst 3 is exemplified by a ceramic three-way catalyst on which a noble metal such as platinum, palladium, or rhodium is supported. However, the present invention is not limited to this. For example, a metal catalyst may be used. Moreover, you may use catalysts and filters other than a three-way catalyst like a diesel particulate filter (Diesel Particulate Filter: DPF) and a selective reduction catalyst (Selective Catalytic Reduction: SCR).

（Ｃ３）上記各実施形態では、中心軸Ａの方向から見た形状が楕円状の触媒３を例示したが、これに限定されるものではない。触媒は、その中心軸方向から見て長手方向が規定される形状であって、その長手方向に沿った中心線及びそれに直交する中心線のいずれを対称軸にしても線対称となる形状であればよく、例えば長方形状又はひし形状などであってもよい。   (C3) In each of the above embodiments, the catalyst 3 having an elliptical shape as viewed from the direction of the central axis A is exemplified, but the present invention is not limited to this. The catalyst has a shape in which the longitudinal direction is defined when viewed from the central axis direction, and has a shape that is symmetrical with respect to any of the center line along the longitudinal direction and the center line orthogonal to the center line. For example, a rectangular shape or a rhombus shape may be used.

（Ｃ４）上記各実施形態では、中心軸Ａの方向から見た形状が楕円状の凹部１１を例示したが、これに限定されるものではない。凹部は、その中心軸方向から見て長手方向が規定される形状であって、その長手方向に沿った中心線及びそれに直交する中心線のいずれを対称軸にしても線対称となる形状であればよく、例えば長方形状又はひし形状などであってもよい。また凹部１１の凹み形状も、上記実施形態の形状に限定されない。   (C4) In each of the above embodiments, the concave portion 11 having an elliptical shape as viewed from the direction of the central axis A is exemplified, but the present invention is not limited to this. The concave portion has a shape in which the longitudinal direction is defined when viewed from the central axis direction, and the concave portion has a shape that is symmetric with respect to any of the central line along the longitudinal direction and the central line perpendicular thereto. For example, a rectangular shape or a rhombus shape may be used. Further, the concave shape of the concave portion 11 is not limited to the shape of the above embodiment.

（Ｃ５）上記各実施形態では、触媒３に流入した排ガスの流速分布が中央部に偏ることを前提として、触媒３における流出面中央部から流出した排ガスが衝突する位置に凹部１１が設けられた構成を例示したが、これに限定されるものではない。例えば、触媒３の上流側及び下流側のうち少なくとも一方の排気流路がカーブ又は偏心している場合など、触媒３の中心軸Ａに沿った方向とは異なる方向から触媒３の上流側へ排ガスが供給される構成においては、触媒３に流入した排ガスの流速分布が中央部以外の部分に偏り得る。このような構成においては、その偏りが生じる位置（排ガスの流速が高い位置）に凹部１１を設けるようにしてもよい。つまり、触媒３の中心軸Ａからずれた位置に凹部１１が支持されるようにしてもよい。なお、凹部１１の位置が異なっても、凹部１１自体は共通の設計にすることが可能である。   (C5) In each of the above embodiments, the recess 11 is provided at a position where the exhaust gas flowing out from the center of the outflow surface of the catalyst 3 collides, assuming that the flow velocity distribution of the exhaust gas flowing into the catalyst 3 is biased toward the center. Although the configuration is exemplified, the configuration is not limited to this. For example, when at least one of the exhaust flow paths of the upstream side and the downstream side of the catalyst 3 is curved or eccentric, the exhaust gas flows from the direction different from the direction along the central axis A of the catalyst 3 to the upstream side of the catalyst 3. In the supplied configuration, the flow velocity distribution of the exhaust gas flowing into the catalyst 3 can be biased to a portion other than the central portion. In such a structure, you may make it provide the recessed part 11 in the position (position where the flow velocity of exhaust gas is high) where the deviation arises. That is, the concave portion 11 may be supported at a position shifted from the central axis A of the catalyst 3. In addition, even if the position of the recessed part 11 differs, recessed part 11 itself can be made into a common design.

（Ｃ６）上記各実施形態では、排気流路における触媒３の下流側のみ又は上流側のみに阻害部材１０が設けられている構成を例示したが、これに限定されるものではなく、触媒３の下流側及び上流側の両方に阻害部材１０が設けられていてもよい。   (C6) In each of the above embodiments, the configuration in which the inhibiting member 10 is provided only on the downstream side or only on the upstream side of the catalyst 3 in the exhaust flow path is illustrated, but the present invention is not limited to this. The inhibiting member 10 may be provided on both the downstream side and the upstream side.

（Ｃ７）上記各実施形態における１つの構成要素が有する機能を複数の構成要素として分散させたり、複数の構成要素が有する機能を１つの構成要素に統合したりしてもよい。また、上記各実施形態の構成の少なくとも一部を、同様の機能を有する公知の構成に置き換えてもよい。また、上記各実施形態の構成の一部を、課題を解決できる限りにおいて省略してもよい。また、上記各実施形態の構成の少なくとも一部を、他の上記実施形態の構成に対して付加、置換等してもよい。なお、特許請求の範囲に記載の文言から特定される技術思想に含まれるあらゆる態様が本発明の実施形態である。   (C7) The functions of one component in each of the above embodiments may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Further, at least a part of the configuration of each of the above embodiments may be replaced with a known configuration having a similar function. Moreover, you may abbreviate | omit a part of structure of said each embodiment as long as a subject can be solved. In addition, at least a part of the configuration of each of the above embodiments may be added to or replaced with the configuration of the other above embodiments. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present invention.

Claims (7)

排気流路に設けられ、排ガスを浄化する触媒と、
前記排気流路に設けられ、排ガスの流れの一部を阻害することによって、前記触媒へ流入する排ガスの流速分布の偏りを軽減させる阻害部材と、
を備え、
前記阻害部材は、前記排気流路の上流側が凹んだ凹部と、前記触媒に対する所定の位置に前記凹部を支持する支持部とを有し、排ガスの流れの一部を前記凹部で阻害し、
前記凹部は、前記凹部の中心軸方向から見て長手方向が規定される形状であって、その長手方向に沿った中心線である第１の凹部中心線及び前記第１の凹部中心線と直交する中心線である第２の凹部中心線のいずれを対称軸にしても線対称となる形状であり、
前記触媒は、前記触媒の中心軸方向から見て長手方向が規定される形状であって、その長手方向に沿った中心線である第１の触媒中心線及び前記第１の触媒中心線と直交する中心線である第２の触媒中心線のいずれを対称軸にしても線対称となる形状であり、
前記阻害部材は、前記触媒に対し、前記第１の凹部中心線と前記第１の触媒中心線とが互いに直交する向きに配置される、排気浄化装置。A catalyst provided in the exhaust passage for purifying exhaust gas;
An inhibiting member that is provided in the exhaust flow path and reduces a deviation in the flow velocity distribution of the exhaust gas flowing into the catalyst by inhibiting a part of the flow of the exhaust gas;
With
The inhibition member has a recess that is recessed on the upstream side of the exhaust flow path, and a support portion that supports the recess at a predetermined position with respect to the catalyst, and a part of the flow of exhaust gas is inhibited by the recess.
The concave portion has a shape in which a longitudinal direction is defined when viewed from the central axis direction of the concave portion, and is perpendicular to the first concave portion center line and the first concave portion center line which are center lines along the longitudinal direction. The shape of the second recess center line that is the center line to be line-symmetrical with respect to any of the symmetry axes,
The catalyst has a shape in which a longitudinal direction is defined when viewed from the central axis direction of the catalyst, and is perpendicular to the first catalyst center line and the first catalyst center line which are center lines along the longitudinal direction. The shape of the second catalyst center line that is the center line to be line-symmetrical with respect to any of the symmetry axes,
The exhaust purification device, wherein the inhibiting member is disposed in a direction in which the first recess center line and the first catalyst center line are orthogonal to each other with respect to the catalyst. 請求項１に記載の排気浄化装置であって、
前記凹部は、前記凹部の中心軸方向から見て、前記第１の凹部中心線に沿った位置における前記凹部の幅が、中心に近いほど大きくなる形状である、排気浄化装置。The exhaust emission control device according to claim 1,
The exhaust emission control device, wherein the recess has a shape in which the width of the recess at a position along the first recess center line is closer to the center as viewed from the central axis direction of the recess. 請求項１又は請求項２に記載の排気浄化装置であって、
前記触媒は、前記触媒の中心軸方向から見て、前記第１の触媒中心線に沿った位置における前記触媒の幅が、中心に近いほど大きくなる形状である、排気浄化装置。The exhaust emission control device according to claim 1 or 2,
The exhaust purification apparatus, wherein the catalyst has a shape in which the width of the catalyst at a position along the first catalyst center line is larger as it is closer to the center when viewed from the center axis direction of the catalyst. 請求項１から請求項３までのいずれか１項に記載の排気浄化装置であって、
前記阻害部材は、前記第１の凹部中心線に沿った前記凹部の長さが、前記第２の触媒中心線に沿った前記触媒の長さよりも短い、排気浄化装置。The exhaust emission control device according to any one of claims 1 to 3, wherein
The inhibition member is an exhaust purification device, wherein a length of the concave portion along the first concave portion center line is shorter than a length of the catalyst along the second catalyst central line. 請求項１から請求項４までのいずれか１項に記載の排気浄化装置であって、
前記阻害部材は、前記触媒よりも前記排気流路の下流側に配置される、排気浄化装置。An exhaust emission control device according to any one of claims 1 to 4, wherein
The exhaust purification device, wherein the inhibition member is disposed on the downstream side of the exhaust flow path with respect to the catalyst. 請求項１から請求項４までのいずれか１項に記載の排気浄化装置であって、
前記阻害部材は、前記触媒よりも前記排気流路の上流側に配置される、排気浄化装置。An exhaust emission control device according to any one of claims 1 to 4, wherein
The exhaust purification device, wherein the inhibition member is disposed upstream of the catalyst in the exhaust flow path. 請求項１から請求項６までのいずれか１項に記載の排気浄化装置であって、
前記凹部は、貫通孔が形成されていない、排気浄化装置。An exhaust emission control device according to any one of claims 1 to 6,
The recess is an exhaust purification device in which a through hole is not formed.
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