JP6702823B2 - Exhaust gas purification device - Google Patents

Exhaust gas purification device Download PDF

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JP6702823B2
JP6702823B2 JP2016152169A JP2016152169A JP6702823B2 JP 6702823 B2 JP6702823 B2 JP 6702823B2 JP 2016152169 A JP2016152169 A JP 2016152169A JP 2016152169 A JP2016152169 A JP 2016152169A JP 6702823 B2 JP6702823 B2 JP 6702823B2
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exhaust gas
honeycomb
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JP2017201163A (en
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崇志 青木
崇志 青木
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NGK Insulators Ltd
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Description

本発明は、排気ガス浄化装置に関する。更に詳しくは、直噴式ガソリンエンジンから排出される排気ガス中の微粒子を効率良く除去し、かつ排気ガスを効率よく浄化することが可能な排気ガス浄化装置に関する。 The present invention relates to an exhaust gas purification device. More specifically, the present invention relates to an exhaust gas purification device capable of efficiently removing fine particles in exhaust gas discharged from a direct injection gasoline engine and efficiently purifying exhaust gas.

近年において、環境保護運動の活発化や、省資源化または省エネルギー化等の種々の要請によって、ガソリン等の燃料消費を抑え、排気ガスの発生量を少なくした状態で長距離、長時間の走行を可能とする優れた低燃費性能を有するエンジンの開発が進められている。特に、自動車の駆動源として多く使用されるガソリンエンジンにおいて、上記の低燃費化の要求を満たすため、燃料をシリンダ内に直噴化してエンジンを駆動する直噴式ガソリンエンジンに係る技術の開発が進められている。 In recent years, due to various demands such as activation of environmental protection movements, resource saving and energy saving, it is possible to suppress the fuel consumption such as gasoline and to run for a long distance and a long time in a state where the amount of exhaust gas is reduced. The development of engines with excellent fuel efficiency that is possible is underway. In particular, in a gasoline engine that is often used as a drive source for automobiles, in order to meet the above demand for low fuel consumption, the development of technology for a direct injection gasoline engine that drives the engine by directly injecting fuel into the cylinder is advanced. Has been.

従来の一般的なガソリンエンジンは、上記の「直噴式」と異なり、主に「吸気ポート燃料噴射方式」が採用されている。この吸気ポート燃料噴射方式を採用したガソリンエンジンの場合、煤等の粒子状物質（ＰＭ：Ｐａｒｔｉｃｕｌａｔｅ Ｍａｔｔｅｒ）の発生量を抑えることが可能であり、粒子状物質による大気汚染や自然環境への影響等は特に大きなものではなかった。しかしながら、直噴式ガソリンエンジンと比べて燃費性能が劣る問題があった。 Unlike the above-mentioned "direct injection type", the conventional general gasoline engine mainly uses the "intake port fuel injection type". In the case of a gasoline engine that adopts this intake port fuel injection method, it is possible to suppress the amount of particulate matter (PM: Particulate Matter) generated, such as soot, and the effect of particulate matter on air pollution and the natural environment, etc. Was not particularly big. However, there is a problem that the fuel efficiency is inferior to that of the direct injection gasoline engine.

一方、直噴式ガソリンエンジンの場合、通常のガソリンエンジンと比べて低燃費化を促進させることができる。しかしながら、粒子状物質の発生量が従来よりも過多となり、発生した粒子状物質を含む排気ガスを適切な処理を経て大気中に放出する必要があった。すなわち、粒子状物質の処理が煩雑となり、また処理に係る装置や設備が必要となった。 On the other hand, in the case of a direct-injection gasoline engine, it is possible to promote lower fuel consumption as compared with a normal gasoline engine. However, the amount of particulate matter generated is larger than in the past, and it is necessary to appropriately discharge the exhaust gas containing the generated particulate matter into the atmosphere. That is, the treatment of the particulate matter becomes complicated, and a device and equipment related to the treatment are required.

一方、大型トラック等に搭載されるディーゼルエンジンの場合、ディーゼルエンジンの稼働によって発生する排気ガス中の粒子状物質を除去する目的で、ハニカム構造体の使用した捕集フィルタ（排気ガス浄化装置）が取り付けられている。排気ガス浄化装置に使用されるハニカム構造体は、両端が所定の配設基準に従って目封止された目封止部を備える目封止ハニカム構造体（特許文献１参照）が主に用いられる。これにより、ディーゼルエンジンから排出された排気ガスは、上記目封止ハニカム構造体の内部の流入し、多孔質性のセラミックス材料で形成された目封止ハニカム構造体の隔壁を通過することで、当該隔壁に粒子状物質が捕集され、堆積する。 On the other hand, in the case of a diesel engine mounted on a large truck, etc., a collection filter (exhaust gas purification device) using a honeycomb structure is used to remove particulate matter in exhaust gas generated by the operation of the diesel engine. It is installed. As a honeycomb structure used in an exhaust gas purifying apparatus, a plugged honeycomb structure (see Patent Document 1) mainly having plugged portions whose both ends are plugged according to a predetermined arrangement standard is mainly used. Thereby, the exhaust gas discharged from the diesel engine flows into the inside of the plugged honeycomb structure, and passes through the partition walls of the plugged honeycomb structure formed of the porous ceramic material, Particulate matter is collected and deposited on the partition.

その結果、ディーゼルエンジンから排出された排気ガス中の粒子状物質が捕集フィルタによって除去され、捕集フィルタの通過後は清浄化された浄化ガスに転換することができる。しかしながら、ディーゼルエンジンとガソリンエンジンとでは、使用する燃料が相違するため、上記したディーゼルエンジン用の捕集フィルタをそのままガソリンエンジンに転用しても、良好な効率で粒子状物質を除去できなかった。 As a result, the particulate matter in the exhaust gas discharged from the diesel engine is removed by the collection filter and can be converted into purified gas after passing through the collection filter. However, since the diesel engine and the gasoline engine use different fuels, the particulate matter could not be removed with good efficiency even if the above diesel engine collecting filter was used as it was for the gasoline engine.

そこで、本願出願人は、直噴式ガソリンエンジンの排気ガスに含まれる粒子状物質の除去を効率的に行うことが可能であり、特に、排気ガスを処理する際に圧力損失が増大することなく、かつ、エンジンの始動直後であっても、高い浄化性能を発揮可能な排気ガス浄化装置の開発を既に提案している（特許文献２参照）。 Therefore, the applicant of the present application can efficiently remove the particulate matter contained in the exhaust gas of the direct injection gasoline engine, and in particular, without increasing the pressure loss when treating the exhaust gas, Moreover, it has already been proposed to develop an exhaust gas purification device capable of exhibiting high purification performance even immediately after the engine is started (see Patent Document 2).

特開２００３−２５４０３４号公報JP, 2003-254034, A 特許第５５８４４８７号公報Patent No. 5584487

上記の特許文献２に記載の排気ガス浄化装置を用いることで、直噴式ガソリンエンジンから排出される排気ガスを、ハニカム構造体を用いた捕集フィルタを利用して効率的に浄化処理することができる。この排気ガス浄化装置は、セルの一部が目封止された目封止ハニカム構造体の上流側の位置に、三元触媒が担持されたハニカム触媒体を更に配設し、ハニカム触媒体の熱容量を減少させる目的で、目封止ハニカム構造体よりもセルの中心軸方向の長さが短い、薄板状のハニカム触媒体が使用されている。 By using the exhaust gas purification device described in Patent Document 2 described above, the exhaust gas emitted from the direct injection gasoline engine can be efficiently purified by using the collection filter using the honeycomb structure. it can. This exhaust gas purifying apparatus further comprises a honeycomb catalyst body carrying a three-way catalyst at a position on the upstream side of a plugged honeycomb structure in which some of the cells are plugged. For the purpose of reducing the heat capacity, a thin plate-shaped honeycomb catalyst body having a shorter cell length in the central axis direction than the plugged honeycomb structure is used.

当該排気ガス浄化装置の場合、ハニカム触媒体及び目封止ハニカム構造体の端面中心（中央）付近の領域に相当する端面中心領域を、多くの排気ガスが流れ、端面中心領域の周囲に位置する端面外周領域は、ほとんど排気ガスが流れないことがあった。すなわち、排気ガス浄化装置の装置内部において、排気ガスの流れに偏りが生じ、排気ガスが多く流れる端面中心領域の付近で粒子状物質が多く捕集され、その他の領域（端面外周領域）では粒子状物質がほとんど捕集されないなどの、粒子状物質の捕集領域に大きな偏りが生じることがあった。 In the case of the exhaust gas purifying apparatus, a large amount of exhaust gas flows and is located around the end face central region in the end face central region corresponding to the region near the end face center (center) of the honeycomb catalyst body and the plugged honeycomb structure. Exhaust gas rarely flows in the outer peripheral area of the end face. That is, in the exhaust gas purifying apparatus, a large amount of particulate matter is collected in the vicinity of the end face central region where the exhaust gas flows largely and the exhaust gas flows unevenly, and in other regions (end face outer peripheral region), particles are collected. A large deviation may occur in the area for collecting the particulate matter, such as the fact that the particulate matter is hardly collected.

そのため、端面中心領域のセルの隔壁に粒子状物質が堆積しやすくなり、長時間に亘る粒子状物質の浄化処理によって、端面中心領域のセルが目詰まりを起こすなどの不具合を生じることがあった。更に粒子状物質の堆積によって圧力損失が大きくなることがあった。したがって、排気ガス浄化装置における粒子状物質の浄化効率や浄化性能が著しく低下するなどの問題を生じることがあった。 Therefore, the particulate matter is likely to be deposited on the partition walls of the cells in the end face central region, and the purification treatment of the particulate matter for a long time may cause problems such as clogging of the cells in the end face central region. .. Further, the pressure loss may increase due to the accumulation of particulate matter. Therefore, there is a problem in that the purification efficiency and purification performance of the particulate matter in the exhaust gas purification device are significantly reduced.

また、目封止ハニカム構造体の上流側に位置するハニカム触媒体においても、同様に端面中心領域の周囲に位置する端面外周領域は、ほとんど排気ガスが流れないことがあった。そのため、ハニカム触媒体の有効断面に対し、効率的な排気ガスの浄化が行われない問題があった。 Further, also in the honeycomb catalyst body located on the upstream side of the plugged honeycomb structure, almost no exhaust gas may flow in the outer peripheral surface of the end surface similarly located around the central area of the end surface. Therefore, there has been a problem that the effective cross section of the honeycomb catalyst body is not efficiently purified.

そこで、本発明は、上記実情に鑑みてなされたものであり、直噴式ガソリンエンジンから排出される排気ガスを、目封止ハニカム構造体及びハニカム触媒体の端面に対して偏りなく流入させることができ、粒子状物質の浄化効率を安定させ、かつ排気ガスを効率よく浄化する排気ガス浄化装置の提供を課題とする。 Therefore, the present invention has been made in view of the above circumstances, and allows exhaust gas discharged from a direct injection gasoline engine to flow into the end faces of the plugged honeycomb structure and the honeycomb catalyst body without deviation. An object of the present invention is to provide an exhaust gas purifying device that can achieve stable purification efficiency of particulate matter and efficiently purify exhaust gas.

本発明によれば、上記課題を解決した排気ガス浄化装置が提供される。 According to the present invention, an exhaust gas purification device that solves the above problems is provided.

［１］ 第一流入側端面から第一流出側端面まで延びる複数のセルを区画形成する格子状の隔壁を有する第一ハニカム基材、及び、前記第一ハニカム基材に担持された触媒を有し、前記セルの両端がそれぞれ開口してなるハニカム触媒体と、第二流入側端面から第二流出側端面まで延びる複数のセルを区画形成する格子状の隔壁を有する第二ハニカム基材、及び、前記第二流入側端面及び／または前記第二流出側端面における前記セルの開口部を予め規定された配設基準に従って目封止して配設された複数の目封止部を有する目封止ハニカム構造体と、前記ハニカム触媒体及び前記ハニカム触媒体の下流の位置に前記目封止ハニカム構造体をそれぞれ収容可能に形成され、前記ハニカム触媒体の前記第一流入側端面と相対する位置に流入口が設けられ、浄化対象の排気ガスが流入する排気ガス流入部及び前記目封止ハニカム構造体の前記第二流出側端面と相対する位置に排出口が設けられ、浄化後の浄化ガスを排出する浄化ガス排出部を有する缶体とを備え、前記目封止ハニカム構造体は、前記第二流入側端面及び前記第二流出側端面の少なくともいずれか一方の端面中心領域における圧力損失が、前記端面中心領域の周囲に位置する端面外周領域の圧力損失と比べて大きくなるように、前記端面中心領域は、前記第二流入側端面及び前記第二流出側端面において、いずれも前記目封止部が配設されているのに対し、前記端面外周領域は、前記第二流入側端面にのみに前記目封止部が配設され、前記圧力損失差に起因して、前記排気ガスを前記端面外周領域側に誘導する排気ガス浄化装置。 [1] A first honeycomb base material having a lattice-shaped partition wall that partitions and forms a plurality of cells extending from the first inflow side end surface to the first outflow side end surface, and a catalyst supported on the first honeycomb base material. Then, a honeycomb catalyst body in which both ends of the cells are respectively opened, and a second honeycomb substrate having a partition wall in a grid shape partitioning and forming a plurality of cells extending from the second inflow side end surface to the second outflow side end surface, and A plug having a plurality of plugging portions arranged by plugging the openings of the cells on the second inflow side end surface and/or the second outflow side end surface according to a predetermined disposition standard. Stop honeycomb structure, and the honeycomb catalyst body and a position formed so as to be able to house the plugged honeycomb structure at a position downstream of the honeycomb catalyst body, respectively, and a position facing the first inflow side end surface of the honeycomb catalyst body. Is provided with an inflow port, an exhaust port is provided at a position facing the exhaust gas inflow part into which the exhaust gas to be purified flows and the second outflow side end face of the plugged honeycomb structure, and the purified gas after purification And a can body having a purified gas discharge part for discharging, the plugged honeycomb structure has a pressure loss in a central region of at least one of the second inflow side end face and the second outflow side end face. , The end face center region has the second inflow side end face and the second outflow side end face both of which are larger than the pressure loss of the end face outer peripheral region located around the end face center region. While the stopper is provided, in the end face outer peripheral region, the plugging portion is provided only on the second inflow side end face, and the exhaust gas is discharged due to the pressure loss difference. An exhaust gas purification device that guides the end surface to the outer peripheral region side .

［２］ 前記端面中心領域は、前記流入口を前記第二流入側端面に垂直に投影した領域を含み、前記端面中心領域の中心領域面積は、前記第二流入側端面と前記ハニカム触媒体を挟んで対向する前記排気ガス流入部の前記流入口の流入口断面積と同一または前記流入口断面積より大きく設定されている前記［１］に記載の排気ガス浄化装置。 [2] The end face center region includes a region in which the inflow port is projected perpendicularly to the second inflow side end face, and the center region area of the end face center region is equal to the second inflow side end face and the honeycomb catalyst body. The exhaust gas purifying apparatus according to the above [1], which is set to be equal to or larger than an inlet cross-sectional area of the inlet of the exhaust gas inflow portion opposed to each other.

［３］ 前記端面中心領域の前記セルの開口率と前記端面外周領域の前記セルの開口率が異なる前記［１］または［２］に記載の排気ガス浄化装置。 [3] The exhaust gas purifying apparatus according to the above [1] or [2], wherein the opening ratio of the cells in the center region of the end face is different from the opening ratio of the cells in the outer peripheral region of the end face.

［４］ 前記目封止ハニカム構造体は、１または複数の角柱状の内側ハニカムセグメントと、前記内側ハニカムセグメントを取り囲む複数の角柱状の外側ハニカムセグメントとを備え、前記内側ハニカムセグメントにおける前記第二流入側端面及び／または前記第二流出側端面は、前記端面中心領域に相当し、前記外側ハニカムセグメントにおける前記第二流入側端面及び／または前記第二流出側端面は、前記端面外周領域に該当する前記［１］〜［３］のいずれかに記載の排気ガス浄化装置。 [4] The plugged honeycomb structure includes one or a plurality of prismatic inner honeycomb segments and a plurality of prismatic outer honeycomb segments surrounding the inner honeycomb segment, and the second honeycomb segment in the inner honeycomb segment The inflow side end surface and/or the second outflow side end surface corresponds to the end surface center area, and the second inflow side end surface and/or the second outflow side end surface in the outer honeycomb segment corresponds to the end surface outer peripheral area. The exhaust gas purifying apparatus according to any one of [1] to [3] above.

［５］ 前記目封止部の前記配設基準は、前記第二流入側端面及び／または前記第二流出側端面における前記セルをそれぞれ一つおきに交互に目封止し、格子状に前記目封止部を配設した構造、及び、前記第二流入側端面における前記セルの断面積と、前記第二流出側端面における前記セルの断面積とがそれぞれ異なるように前記目封止部を配設した構造の少なくともいずれか一方である前記［１］〜［４］のいずれかに記載の排気ガス浄化装置。 [5] The arrangement standard of the plugged portions is that every other one of the cells on the second inflow side end surface and/or the second outflow side end surface is alternately plugged, and the cells are arranged in a grid pattern. A structure in which a plugging portion is provided, and the plugging portion is formed so that the cross-sectional area of the cell at the second inflow side end surface and the cross-sectional area of the cell at the second outflow side end surface are different from each other. The exhaust gas purifying apparatus according to any one of [1] to [4], which has at least one of the arranged structures.

［６］ 前記第一ハニカム基材の隔壁の気孔率は、前記第二ハニカム基材の隔壁の気孔率より小さく設定されている前記［１］〜［５］のいずれかに記載の排気ガス浄化装置。 [6] The exhaust gas purification according to any one of [1] to [5], wherein the partition walls of the first honeycomb base material have a porosity set to be smaller than that of the partition walls of the second honeycomb base material. apparatus.

［７］ 前記目封止ハニカム構造体の中心軸方向の長さに対する前記ハニカム触媒体の中心軸方向の長さの比の値が、０．１〜０．５である前記［１］〜［６］のいずれかに記載の排気ガス浄化装置。 [7] The value of the ratio of the length of the honeycomb catalyst body in the central axis direction to the length of the plugged honeycomb structure in the central axis direction is 0.1 to 0.5. [6] The exhaust gas purification device according to any one of [6].

［８］ 前記ハニカム触媒体の直径に対する前記ハニカム触媒体の中心軸方向の長さの比の値が、０．１〜０．６である前記［１］〜［７］のいずれかに記載の排気ガス浄化装置。 [8] The value of the ratio of the length in the central axis direction of the honeycomb catalyst body to the diameter of the honeycomb catalyst body is 0.1 to 0.6, according to any one of the above [1] to [7]. Exhaust gas purification device.

［９］ 前記目封止ハニカム構造体は、前記第二ハニカム基材に担持された触媒を有し、前記ハニカム触媒体の前記第一ハニカム基材に担持される前記触媒の単位体積当たりの担持量が、２００〜４００ｇ／Ｌであり、前記目封止ハニカム構造体の前記第二ハニカム基材に担持される前記触媒の単位体積当たりの担持量が、１０〜１２０ｇ／Ｌである前記［１］〜［８］のいずれかに記載の排気ガス浄化装置。 [9] The plugged honeycomb structure has a catalyst supported on the second honeycomb base material, and the honeycomb catalyst body is supported on the first honeycomb base material per unit volume of the catalyst. The amount is 200 to 400 g/L, and the amount of the catalyst supported on the second honeycomb substrate of the plugged honeycomb structure per unit volume is 10 to 120 g/L. ] The exhaust gas purification apparatus in any one of [8].

［１０］ 前記第一ハニカム基材の隔壁厚さが、５０．８〜１０１．６μｍの範囲である前記［１］〜［９］のいずれかに記載の排気ガス浄化装置。 [10] The exhaust gas purification device according to any one of [1] to [9], wherein the partition wall thickness of the first honeycomb substrate is in the range of 50.8 to 101.6 μm.

［１１］ 前記ハニカム触媒体と前記目封止ハニカム構造体との間の距離が、１〜２０ｍｍである前記［１］〜［１０］のいずれかに記載の排気ガス浄化装置。 [11] The exhaust gas purifying apparatus according to any of [1] to [10], wherein the distance between the honeycomb catalyst body and the plugged honeycomb structure is 1 to 20 mm.

［１２］ 前記缶体の前記排気ガス流入部及び前記ハニカム触媒体の前記第一流入側端面の間に設けられ、外周壁に複数の孔部が穿設された円筒状の整流部を更に備え、前記流入口に対向する前記整流部の一端から取り込まれた前記排気ガスの前記ハニカム触媒体及び前記目封止ハニカム構造体の軸方向に直交する方向への流れを調整する前記［１］〜［１１］のいずれかに記載の排気ガス浄化装置。 [12] A cylindrical rectifying portion provided between the exhaust gas inflow portion of the can body and the first inflow side end surface of the honeycomb catalyst body and having a plurality of holes formed in an outer peripheral wall thereof. Adjusting the flow of the exhaust gas taken in from one end of the rectifying section facing the inflow port in a direction orthogonal to the axial direction of the honeycomb catalyst body and the plugged honeycomb structure [1] to The exhaust gas purification device according to any one of [11].

本発明の排気ガス浄化装置によれば、目封止ハニカム構造体に設けられた第二ハニカム基材の第二流入側端面及び第二流出側端面の端面中心領域及び／または端面外周領域における排気ガスによる圧力損失をそれぞれ異ならせることができる。更に具体的には、端面中心領域付近の圧力損失を、端面外周領域の圧力損失に対して大きくすることができ、排気ガスがハニカム触媒体及び目封止ハニカム構造体の端面中心領域に偏って流れることが抑制され、第一流入側端面及び／または第一流出側端面、及び、第二流入側端面及び／または第二流出側端面の全体に亘って均一に排気ガスを流すことができる。これにより、排気ガスに含まれる粒子状物質を効率的に除去し、かつ排気ガスを効率よく浄化することが可能となる。 According to the exhaust gas purifying apparatus of the present invention, exhaust gas in the end face center region and/or end face outer peripheral region of the second inflow side end face and the second outflow side end face of the second honeycomb substrate provided in the plugged honeycomb structure The pressure loss due to the gas can be made different. More specifically, the pressure loss near the end face central region can be made larger than the pressure loss in the end face outer peripheral region, and the exhaust gas is biased toward the end face central region of the honeycomb catalyst body and the plugged honeycomb structure. Flow is suppressed, and the exhaust gas can be made to flow uniformly over the entire first inflow side end surface and/or the first outflow side end surface and the second inflow side end surface and/or the second outflow side end surface. This makes it possible to efficiently remove the particulate matter contained in the exhaust gas and efficiently purify the exhaust gas.

本実施形態の排気ガス浄化装置の中心軸に沿って一部を切欠いた一部切欠斜視図である。FIG. 3 is a partially cutaway perspective view in which a part is cut out along the central axis of the exhaust gas purification device of the present embodiment. 排気ガス浄化装置の中心軸に平行な断面を模式的に示す説明図である。It is explanatory drawing which shows typically the cross section parallel to the central axis of an exhaust gas purification device. ハニカム触媒体の第一流入側端面を模式的に示す説明図である。FIG. 3 is an explanatory view schematically showing a first inflow side end surface of the honeycomb catalyst body. 目封止ハニカム構造体の第二流入側端面を模式的に示す説明図である。It is explanatory drawing which shows typically the 2nd inflow side end surface of a plugged honeycomb structure. 目封止ハニカム構造体の第二流出側端面を模式的に示す説明図である。It is explanatory drawing which shows typically the 2nd outflow side end surface of a plugged honeycomb structure. 目封止ハニカム構造体の目封止部の配設基準の別例構成を模式的に示す説明図である。It is explanatory drawing which shows typically the other example structure of the arrangement|positioning standard of the plugged part of a plugged honeycomb structure. 目封止ハニカム構造体の目封止部の配設基準の別例構成を模式的に示す説明図である。It is explanatory drawing which shows typically the other example structure of the arrangement|positioning standard of the plugged part of a plugged honeycomb structure. 目封止ハニカム構造体の目封止部の配設基準の別例構成を模式的に示す説明図である。It is explanatory drawing which shows typically the other example structure of the arrangement|positioning standard of the plugged part of a plugged honeycomb structure. 目封止ハニカム構造体の目封止部の配設基準の別例構成を模式的に示す説明図である。It is explanatory drawing which shows typically the other example structure of the arrangement|positioning standard of the plugged part of a plugged honeycomb structure. 目封止ハニカム構造体の別例構成を模式的に示す斜視図である。It is a perspective view which shows typically the example of another structure of a plugged honeycomb structure. 缶体内部に整流部を設けた排気ガス浄化装置の別例構成を示す中心軸に沿って一部を切欠いた一部分解切欠斜視図である。It is a partially exploded cutaway perspective view in which a part is cut out along a central axis showing another example configuration of an exhaust gas purifying device in which a rectifying unit is provided inside a can body. 図１１の別例構成の排気ガス浄化装置の中心軸に平行な断面を模式的に示す説明図である。It is explanatory drawing which shows typically the cross section parallel to the central axis of the exhaust gas purification apparatus of another example structure of FIG.

以下、図面を参照しつつ本発明の排気ガス浄化装置の実施の形態について詳述する。なお、本発明の排気ガス浄化装置は、以下の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない限りにおいて、種々の設計の変更、修正、及び改良等を加え得るものである。 Hereinafter, an embodiment of an exhaust gas purifying apparatus of the present invention will be described in detail with reference to the drawings. The exhaust gas purifying apparatus of the present invention is not limited to the following embodiments, and various design changes, modifications, and improvements can be added without departing from the gist of the present invention. is there.

［１］排気ガス浄化装置：
本実施形態の排気ガス浄化装置１は、図１〜図５に示されるように、第一流入側端面１１から第一流出側端面１２まで延びる複数のセル１３を区画形成する格子状の隔壁１４を有する第一ハニカム基材１５、及び、第一ハニカム基材１５に担持された触媒を有し、セル１３の両端がそれぞれ開口してなるハニカム触媒体１０と、第二流入側端面２１から第二流出側端面２２まで延びる複数のセル２３を区画形成する格子状の隔壁２４を有する第二ハニカム基材２５、及び、第二流入側端面２１及び／または第二流出側端面２２におけるセル２３の開口部を予め規定された配設基準に従って目封止して配設された複数の目封止部２６を有する目封止ハニカム構造体２０と、ハニカム触媒体１０及び目封止ハニカム構造体２０をそれぞれ収容可能に形成され、排気ガス流入部３１及び浄化ガス排出部３２を有する金属製の缶体３０とを主に備えている。 [1] Exhaust gas purification device:
As shown in FIGS. 1 to 5, the exhaust gas purification device 1 of the present embodiment has a grid-shaped partition wall 14 that partitions and forms a plurality of cells 13 extending from the first inflow side end face 11 to the first outflow side end face 12. From the second inflow side end face 21 to the first honeycomb base material 15 having the above, and the catalyst supported on the first honeycomb base material 15, and the honeycomb catalyst body 10 in which both ends of the cells 13 are open. A second honeycomb substrate 25 having a lattice-shaped partition wall 24 that partitions and forms a plurality of cells 23 extending to the second outflow side end surface 22, and the cells 23 in the second inflow side end surface 21 and/or the second outflow side end surface 22. A plugged honeycomb structure 20 having a plurality of plugged portions 26 in which openings are plugged according to a predetermined placement standard, a honeycomb catalyst body 10 and a plugged honeycomb structure 20. And a metal can body 30 having an exhaust gas inflow portion 31 and a purified gas exhaust portion 32, respectively.

ここで、ハニカム触媒体１０は、第一ハニカム基材１５の第一流入側端面１１を缶体３０の排気ガス流入部３１の流入口３３と相対するようにして当該缶体３０の内部に収容され、一方、目封止ハニカム構造体２０は、第二流出側端面２２を缶体３０の浄化ガス排出部３２の排出口３４と相対するようにして当該缶体３０の内部に収容される。すなわち、缶体３０の内部の上流側にハニカム触媒体１０が位置し、その下流側の位置に目封止ハニカム構造体２０が位置している（図１及び図２参照）。このとき、缶体３０内に収容されたハニカム触媒体１０及び目封止ハニカム構造体２０は、ハニカム触媒体１０（第一ハニカム基材１５）の第一流出側端面１２と、目封止ハニカム構造体２０（第二ハニカム基材２５）の第二流入側端面２１とが互いに相対する位置に設置され、更に第一流出側端面１２及び第二流入側端面２１の間に所定の空隙（距離Ｗ）が設けられている。なお、第一流出側端面１２及び第二流入側端面２１の間の距離Ｗは、本実施形態では１〜２０ｍｍの範囲となるように設定されている。 Here, the honeycomb catalyst body 10 is housed inside the can body 30 such that the first inflow-side end surface 11 of the first honeycomb substrate 15 faces the inflow port 33 of the exhaust gas inflow part 31 of the can body 30. On the other hand, the plugged honeycomb structure 20 is housed inside the can body 30 with the second outflow side end surface 22 facing the discharge port 34 of the purified gas discharge part 32 of the can body 30. That is, the honeycomb catalyst body 10 is located on the upstream side inside the can body 30, and the plugged honeycomb structure 20 is located on the downstream side thereof (see FIGS. 1 and 2 ). At this time, the honeycomb catalyst body 10 and the plugged honeycomb structure 20 housed in the can body 30 have the first outflow side end surface 12 of the honeycomb catalyst body 10 (first honeycomb substrate 15) and the plugged honeycomb. The structure 20 (the second honeycomb substrate 25) is installed at a position where the second inflow side end face 21 and the second inflow side end face 21 face each other, and a predetermined gap (distance is provided between the first outflow side end face 12 and the second inflow side end face 21. W) is provided. The distance W between the first outflow side end surface 12 and the second inflow side end surface 21 is set to be in the range of 1 to 20 mm in the present embodiment.

ここで、缶体３０は金属製材料から主に構成され、上記の円柱状のハニカム触媒体１０及び目封止ハニカム構造体２０をそれぞれ内包して収容可能な構造及び内径から構成され、ハニカム触媒体１０の直径Ｄ１及び目封止ハニカム構造体２０の直径Ｄ２より大きな内径Ｄ３を有する円筒状の缶体本体３５と、缶体本体３５の両端に取設された上述の排気ガス流入部３１及び浄化ガス排出部３２とをそれぞれ備えている。 Here, the can body 30 is mainly composed of a metallic material, and has a structure and an inner diameter capable of accommodating and accommodating the cylindrical honeycomb catalyst body 10 and the plugged honeycomb structure 20, respectively. A cylindrical can body 35 having an inner diameter D3 larger than the diameter D1 of the medium 10 and the diameter D2 of the plugged honeycomb structure 20, the above-mentioned exhaust gas inflow portion 31 provided at both ends of the can body 35, The cleaning gas discharge part 32 is provided, respectively.

排気ガス流入部３１は、直噴式ガソリンエンジンの排気ガス排出部（図示しない）と接続され、排気ガスＥＧを排気ガス浄化装置１まで導くための、缶体本体３５より細径の円筒状部材で構成された導入管３６と、導入管３６の一端の流入口３３から缶体本体３５まで拡径した截頭円錐形状の拡径部３７とを有して構成されている。一方、浄化ガス排出部３２は、目封止ハニカム構造体２０を通過し、清浄化された浄化ガスＣＧを外部に排出するものであり、缶体本体３５の他端から縮径した截頭円錐形状の縮径部３８と、縮径部３８の一端の排出口３４と接続し、浄化ガスＣＧを外部に排出する細径の円筒状の排出管３９とを有して構成されている。 The exhaust gas inflow portion 31 is connected to an exhaust gas exhaust portion (not shown) of a direct injection gasoline engine, and is a cylindrical member having a diameter smaller than that of the can body 35 for guiding the exhaust gas EG to the exhaust gas purification device 1. It is configured to have a configured introduction pipe 36 and a frustoconical-shaped enlarged diameter portion 37 whose diameter is increased from the inflow port 33 at one end of the introduction pipe 36 to the can body 35. On the other hand, the purified gas discharge part 32 discharges the purified gas CG that has been purified by passing through the plugged honeycomb structure 20, and is a truncated cone whose diameter is reduced from the other end of the can body 35. The reduced-diameter portion 38 has a shape and a small-diameter cylindrical discharge pipe 39 that is connected to the discharge port 34 at one end of the reduced-diameter portion 38 and discharges the purified gas CG to the outside.

ここで、導入管３６及び排出管３９と、拡径部３７及び縮径部３８とはそれぞれ同一形状で構成されている。本実施形態の排気ガス浄化装置１は、缶体３０の内部にハニカム触媒体１０を目封止ハニカム構造体２０の上流位置に配置することで、排気ガス流入部３１の流入口３３とハニカム触媒体１０の第一流入側端面１１を相対させることができる。その結果、直噴式ガソリンエンジンから送られた高温の排気ガスＥＧの熱を利用してハニカム触媒体１０の温度を上げることができ、担持された触媒が高い活性を示す温度まで短時間で到達させることができる。これにより、エンジンの始動開始直後から高い触媒活性による排気ガスＥＧの浄化処理を効率良く行うことができる。 Here, the introduction pipe 36 and the discharge pipe 39, and the enlarged diameter portion 37 and the reduced diameter portion 38 have the same shape. The exhaust gas purifying apparatus 1 of the present embodiment arranges the honeycomb catalyst body 10 inside the can body 30 at an upstream position of the plugged honeycomb structure 20 so that the exhaust gas inflow portion 31 and the honeycomb inlet 10 can be connected to each other. The first inflow side end surface 11 of the medium 10 can be made to face each other. As a result, the temperature of the honeycomb catalyst body 10 can be raised by utilizing the heat of the high-temperature exhaust gas EG sent from the direct injection gasoline engine, and the temperature at which the carried catalyst exhibits high activity can be reached in a short time. be able to. As a result, the purification process of the exhaust gas EG due to the high catalyst activity can be efficiently performed immediately after the start of the engine.

前述したように、缶体３０の円筒状の缶体本体３５の内径Ｄ３は、ハニカム触媒体１０及び目封止ハニカム構造体２０の直径Ｄ１，Ｄ２よりも大きくなるように設計されている。したがって、缶体３０の内部にハニカム触媒体１０等をそのまま収容した場合、缶体本体３５の内周壁面４０と、ハニカム触媒体１０の外周壁面１６及び目封止ハニカム構造体２０の外周壁面２７との間に隙間が生じ、缶体３０の内部でハニカム触媒体１０等が移動可能となり、収容状態が安定しない。そこで、ハニカム触媒体１０等の外周壁面１６等と、缶体本体３５の内周壁面４０との間に緩衝性素材からなるクッション材４１が介設されている。これにより、上記隙間にクッション材４１を充填することで、ハニカム触媒体１０等の缶体本体３５の内部での移動を規制し、収容状態を安定させることができる。 As described above, the inner diameter D3 of the cylindrical can body 35 of the can 30 is designed to be larger than the diameters D1 and D2 of the honeycomb catalyst body 10 and the plugged honeycomb structure 20. Therefore, when the honeycomb catalyst body 10 and the like are housed in the can body 30 as they are, the inner wall surface 40 of the can body 35, the outer wall surface 16 of the honeycomb catalyst body 10 and the outer wall surface 27 of the plugged honeycomb structure 20. A gap is created between the honeycomb catalyst body 10 and the can, and the honeycomb catalyst body 10 and the like can move inside the can body 30, and the housed state is not stable. Therefore, a cushion material 41 made of a cushioning material is provided between the outer peripheral wall surface 16 of the honeycomb catalyst body 10 and the like and the inner peripheral wall surface 40 of the can body 35. As a result, by filling the gap with the cushion material 41, the movement of the honeycomb catalyst body 10 or the like inside the can body 35 can be regulated and the housed state can be stabilized.

更に、缶体３０の内部のハニカム触媒体１０及び目封止ハニカム構造体２０の前後方向（図２における紙面左右方向に相当）への移動を規制するために、断面Ｌ字形状の一対のストッパ部材４２が内周壁面４０に沿って取設されている。ハニカム触媒体１０の第一流入側端面１１及び第一流出側端面１２、及び、目封止ハニカム構造体２０の第二流入側端面２１及び第二流出側端面２２とそれぞれ当接し、ハニカム触媒体１０及び目封止ハニカム構造体２０を挟み込むようにして固定する一対のストッパ部材４２によって、缶体３０の内部でのハニカム触媒体１０等の前後方向への移動が規制される。 Further, in order to restrict the movement of the honeycomb catalyst body 10 and the plugged honeycomb structure 20 inside the can body 30 in the front-rear direction (corresponding to the left-right direction on the paper surface in FIG. 2), a pair of stoppers having an L-shaped cross section are provided. A member 42 is attached along the inner peripheral wall surface 40. The honeycomb catalyst body 10 comes into contact with the first inflow side end surface 11 and the first outflow side end surface 12 of the honeycomb catalyst body 10, and the second inflow side end surface 21 and the second outflow side end surface 22 of the plugged honeycomb structure 20, respectively. Movement of the honeycomb catalyst body 10 and the like in the can body 30 in the front-rear direction is restricted by the pair of stopper members 42 that fix the plug 10 and the plugged honeycomb structure 20 by sandwiching them.

上記クッション材４１及びストッパ部材４２によって、ハニカム触媒体１０及び目封止ハニカム構造体２０を缶体本体３５の内部に安定した状態で収容することができる。更に、缶体３０に衝撃が加わった場合であっても、クッション材４１等によって当該衝撃を吸収し、ハニカム触媒体１０等に割れや欠けなどが生じる可能性を低く抑えることができる。 With the cushion material 41 and the stopper member 42, the honeycomb catalyst body 10 and the plugged honeycomb structure 20 can be accommodated in the can body 35 in a stable state. Further, even when a shock is applied to the can body 30, the shock is absorbed by the cushion material 41 and the like, and the possibility that the honeycomb catalyst body 10 and the like are cracked or chipped can be suppressed to a low level.

本実施形態の排気ガス浄化装置１に使用されるハニカム触媒体１０は、図１〜３に示すように、円柱状の構造を呈し、第一流入側端面１１から第一流出側端面１２まで延びる複数のセル１３を区画形成する四角形格子状の隔壁１４を有している。一方、排気ガス浄化装置１に使用される目封止ハニカム構造体２０は、図１，２、及び図４，５に示すように、円柱状の構造を呈し、第二流入側端面２１から第二流出側端面２２まで延びる複数のセル２３を区画形成する四角形格子状の隔壁２４を有し、第二流入側端面２１及び第二流出側端面２２における端面中心領域Ｃ（図４及び図５の破線円内に相当）の圧力損失が、端面中心領域Ｃの周囲に位置する端面外周領域Ｏ（図４及び図５の破線円外に相当）の圧力損失と比べて大きくなるように設計されている。 As shown in FIGS. 1 to 3, the honeycomb catalyst body 10 used in the exhaust gas purification apparatus 1 of the present embodiment has a columnar structure and extends from the first inflow side end face 11 to the first outflow side end face 12. It has partition walls 14 in the shape of a quadrangular grid that partition-form a plurality of cells 13. On the other hand, the plugged honeycomb structure 20 used in the exhaust gas purifying apparatus 1 has a columnar structure as shown in FIGS. It has partition walls 24 in the shape of a quadrangle lattice that divides and forms a plurality of cells 23 extending to the two outflow-side end faces 22, and the end-face center regions C in the second inflow-side end face 21 and the second outflow-side end face 22 (in FIGS. The pressure loss (corresponding to the inside of the broken line circle) is designed to be larger than the pressure loss of the end face outer peripheral region O (corresponding to the outside of the broken line circle of FIGS. 4 and 5) located around the end face center region C. There is.

端面中心領域Ｃにおいて、第二流入側端面２１に開口した所定のセル２３ａの開口部と、第二流出側端面２２の残余のセル２３ｂの開口部をそれぞれ目封止する目封止部２６が、予め規定された配設基準にしたがって規則正しく配設されている（図４及び図５等参照）。本実施形態では、端面中心領域Ｃのセル２３ａを一つおきに交互に目封止し、更に下段を一つずつずらして交互に目封止することによって、複数の目封止部２６を格子状に配した市松模様（チェッカーボードパターン）を呈するように配設されている。 In the end face center region C, there are plugging portions 26 that plug the openings of the predetermined cells 23a opened in the second inflow side end face 21 and the remaining cells 23b of the second outflow side end face 22, respectively. , Are regularly arranged according to a predetermined arrangement standard (see FIGS. 4 and 5 and the like). In the present embodiment, every other cell 23a in the end face center region C is alternately plugged, and the lower rows are shifted one by one to alternately plug the cells 23a to form a plurality of plugged portions 26 in a grid. The checkerboard pattern is arranged in a checkerboard pattern.

一方、端面外周領域Ｏの第二流入側端面２１では、第二流入側端面２１の端面中心領域Ｃと同様に、一つおきに交互に目封止し、下段を一つずつずらして交互に目封止することによって、複数の目封止部２６を格子状に配設している（図４参照）。これに対し、端面外周領域Ｏの第二流出側端面２２では、目封止部２６の配設をしていない（図５参照）。すなわち、端面外周領域Ｏの第二流出側端面２２におけるセル２３ｂは、全て開口されている。つまり、端面中心領域Ｃは、第二流入側端面２１及び第二流出側端面２２において、いずれも目封止部２６が配設されているのに対し、端面外周領域Ｏは、第二流入側端面２１のみに目封止部２６が配設されている。 On the other hand, in the second inflow side end surface 21 of the end surface outer peripheral area O, similarly to the end surface center area C of the second inflow side end surface 21, alternately every other plugging is performed, and the lower stages are shifted one by one and alternately. By plugging, the plurality of plugging portions 26 are arranged in a grid pattern (see FIG. 4). On the other hand, on the second outflow side end surface 22 of the end surface outer peripheral region O, the plugging portion 26 is not provided (see FIG. 5 ). That is, all the cells 23b on the second outflow side end surface 22 of the end surface outer peripheral region O are open. That is, in the end face center region C, the plugging portions 26 are arranged in both the second inflow side end face 21 and the second outflow side end face 22, whereas the end face outer peripheral region O is in the second inflow side. The plugging portion 26 is provided only on the end face 21.

これにより、端面中心領域Ｃと比べて端面外周領域Ｏの方が圧力損失が小さくなり、排気ガスＥＧが流れ込み易くなる。このように、第二流入側端面２１及び第二流出側端面２２の間の目封止部２６の配設基準を変更することで、端面中心領域Ｃ及び端面外周領域Ｏにおけるセル２３の開口率を異なるものとすることができ、排気ガスＥＧの流れを任意に制御し、端面中心領域Ｃのみに偏って排気ガスＥＧが流れることを抑制することができる。なお、上記した目封止部２６の配設基準を変化させる以外に、例えば、セルの開口形状をＨＡＣ構造（詳細は後述する）にすることで、端面中心領域Ｃ及び端面外周領域Ｏのそれぞれのセル２３の開口率を異なるものとしてもよい。これにより、端面中心領域Ｃ及び端面外周領域Ｏの間で圧力損失差を生じさせることができる。 As a result, the pressure loss in the end face outer peripheral region O becomes smaller than that in the end face central region C, and the exhaust gas EG easily flows in. In this way, by changing the arrangement standard of the plugging portions 26 between the second inflow side end face 21 and the second outflow side end face 22, the opening ratio of the cells 23 in the end face center region C and the end face outer peripheral region O. Can be made different, the flow of the exhaust gas EG can be arbitrarily controlled, and the flow of the exhaust gas EG can be suppressed from flowing only in the end face center region C. In addition to changing the above-mentioned arrangement standard of the plugging portions 26, for example, by setting the opening shape of the cell to a HAC structure (details will be described later), the end face center region C and the end face outer peripheral region O are respectively formed. The cell 23 may have different aperture ratios. Thereby, a pressure loss difference can be generated between the end face center region C and the end face outer peripheral region O.

ここで、端面中心領域Ｃは、缶体３０の流入口３３を第二流入側端面２１（または第二流出側端面２２）にそのまま垂直に投影した領域を少なくとも含み、端面中心領域Ｃの中心領域面積（図４及び図５の破線円内の面積に相当）は、第二流入側端面２１とハニカム触媒体１０を挟んで対向する排気ガス流入部３１の流入口３３における流入口断面積と同一若しくはそれより大きくなるサイズに設定されている。 Here, the end face center region C includes at least a region in which the inflow port 33 of the can 30 is vertically projected onto the second inflow side end face 21 (or the second outflow side end face 22) as it is, and the center region of the end face center region C is included. The area (corresponding to the area inside the dashed circle in FIGS. 4 and 5) is the same as the inlet cross-sectional area at the inlet 33 of the exhaust gas inflow portion 31 that faces the second inflow-side end surface 21 with the honeycomb catalyst body 10 in between. Alternatively, the size is set to be larger than that.

排気ガス流入部３１から缶体３０の内部に流入した排気ガスＥＧは、一般に直進性を示す性質がある。そのため、従来の排気ガス浄化装置の場合、流入口３３から拡径部３７に至った排気ガスＥＧは、流入口３３の口径に沿ってそのまま進み、上下方向（図２における紙面上下方向に相当）及び左右方向（図２における紙面手前から奥行方向に相当）に大きく拡がることなく、真っ直ぐにハニカム触媒体１０の第一流入側端面１１に到達しようとする。 The exhaust gas EG that has flowed from the exhaust gas inflow portion 31 into the inside of the can body 30 generally has a property of showing straightness. Therefore, in the case of the conventional exhaust gas purifying device, the exhaust gas EG that has reached the expanded diameter portion 37 from the inflow port 33 proceeds along the diameter of the inflow port 33 as it is and in the vertical direction (corresponding to the vertical direction of the paper surface in FIG. 2). In addition, the first catalytic converter 10 tries to reach the first inflow-side end surface 11 of the honeycomb catalyst body 10 in a straight line without greatly expanding in the left-right direction (corresponding to the depth direction from the front side of the paper surface in FIG. 2).

その後、ハニカム触媒体１０による触媒活性反応を受けた排気ガスＥＧは、第一流出側端面１２から前述の隙間（距離Ｗ）を経て、目封止ハニカム構造体２０の第二流入側端面２１に至る。このときも排気ガスＥＧは、直進性を示して流れるため、第二流入側端面２１には目封止ハニカム構造体２０の端面中心領域Ｃの近傍で多くの排気ガスＥＧが流入しようとする。 After that, the exhaust gas EG which has undergone the catalytic activation reaction by the honeycomb catalyst body 10 passes through the above-mentioned gap (distance W) from the first outflow side end surface 12 to the second inflow side end surface 21 of the plugged honeycomb structure 20. Reach At this time as well, the exhaust gas EG flows straightly, so that a large amount of the exhaust gas EG tries to flow into the second inflow side end face 21 in the vicinity of the end face central region C of the plugged honeycomb structure 20.

しかしながら、本実施形態の排気ガス浄化装置１は、目封止ハニカム構造体２０の端面中心領域Ｃの圧力損失を、端面外周領域Ｏよりも大きくすることで、流入口３３から直進しようとする排気ガスＥＧの流れを規制し、排気ガスＥＧの一部を端面中心領域Ｃの周囲の端面外周領域Ｏに向けることができる。すなわち、缶体３０の内部において、端面中心領域Ｃと端面外周領域Ｏとの間で圧力損失に違いが生じている場合、圧力損失の小さい端面外周領域Ｏ側に排気ガスＥＧが流れる。 However, the exhaust gas purifying apparatus 1 of the present embodiment makes the pressure loss of the end face central region C of the plugged honeycomb structure 20 larger than that of the end face outer peripheral region O, so that the exhaust gas that tries to go straight from the inlet 33. The flow of the gas EG can be regulated, and part of the exhaust gas EG can be directed to the end face outer peripheral region O around the end face central region C. That is, when there is a difference in pressure loss between the end face center region C and the end face outer peripheral region O inside the can body 30, the exhaust gas EG flows to the end face outer peripheral region O side where the pressure loss is small.

更に、係る圧力損失の違いは、目封止ハニカム構造体２０の上流側に位置するハニカム触媒体１０を通過する排気ガスＥＧの流れ方向にも影響を与える。そのため、流入口３３からハニカム触媒体１０の第一流入側端面１１に向かう排気ガスＥＧにおいても、第一流入側端面１１の端面中心領域（図示しない）から端面外周領域（図示しない）に向かう排気ガスＥＧの流れを生じさせることができる。そのため、目封止ハニカム構造体２０による粒子状物質の堆積による偏りを抑制するとともに、触媒活性反応もハニカム触媒体１０の全面に亘って均一に生じさせることができる。すなわち、触媒作用を有効に発揮するハニカム触媒体１０の有効断面を効率的に使用することができ、ハニカム触媒体１０の端面中心領域に偏って排気ガスＥＧが流れることがない。 Further, the difference in the pressure loss affects the flow direction of the exhaust gas EG passing through the honeycomb catalyst body 10 located on the upstream side of the plugged honeycomb structure 20. Therefore, even in the exhaust gas EG flowing from the inflow port 33 toward the first inflow side end surface 11 of the honeycomb catalyst body 10, the exhaust gas EG traveling from the end surface center area (not shown) of the first inflow side end surface 11 to the end surface outer peripheral area (not shown). A flow of gas EG can be produced. Therefore, it is possible to suppress the deviation due to the accumulation of the particulate matter by the plugged honeycomb structure 20 and also to cause the catalytic activation reaction uniformly over the entire surface of the honeycomb catalyst body 10. That is, the effective cross section of the honeycomb catalyst body 10 that effectively exhibits the catalytic action can be efficiently used, and the exhaust gas EG does not flow unevenly in the center area of the end face of the honeycomb catalyst body 10.

目封止ハニカム構造体２０に配設される目封止部２６を構成する材料は、特に限定されるものではなく、セラミック原料、アルコール、及び有機バインダ等を組み合わせた目封止材から作製することが可能であり、セラミック原料としては、後述する第一ハニカム基材１５または第二ハニカム基材２５と同一又は同種のセラミック原料であることが好ましい。これにより、焼成時における高温の挙動を同一にすることができ、隔壁２４及び目封止部２６の間で熱膨張や熱収縮による無理な負荷が加わることがなく、隔壁２４及び目封止部２６を強固に結合させることができる。 The material forming the plugging portion 26 arranged in the plugged honeycomb structure 20 is not particularly limited, and is made of a plugging material in which a ceramic raw material, alcohol, an organic binder and the like are combined. It is possible, and the ceramic raw material is preferably the same or the same kind of ceramic raw material as the first honeycomb substrate 15 or the second honeycomb substrate 25 described later. As a result, the behavior of the high temperature during firing can be made the same, an unreasonable load due to thermal expansion and contraction is not applied between the partition wall 24 and the plugging portion 26, and the partition wall 24 and the plugging portion 26 are not applied. 26 can be firmly bonded.

［２］ハニカム触媒体：
本実施形態の排気ガス浄化装置１に使用されるハニカム触媒体１０は、図１〜図３に示すように、円柱状の構造を呈し、第一流入側端面１１から第一流出側端面１２に至る複数のセル１３を区画形成する多孔質素材の格子状の隔壁１４を有する第一ハニカム基材１５を備えており、上記の目封止ハニカム構造体２０のように、複数の目封止部２６によってセル１３の両端が塞がれていない、いずれの端面１１，１２がそれぞれ開口している。ここで、ハニカム触媒体１０の直径Ｄ１に対するハニカム触媒体１０の中心軸方向（図１における一点鎖線Ａ参照。）の長さＬ１の比（＝Ｌ１／Ｄ１）の値が、０．１〜０．６の範囲となるように設定されている。この比は、０．１５〜０．３５の範囲であることが更に好ましく、０．２〜０．３の範囲であることが特に好ましい。 [2] Honeycomb catalyst body:
As shown in FIGS. 1 to 3, the honeycomb catalyst body 10 used in the exhaust gas purifying apparatus 1 of the present embodiment has a columnar structure, and the first inflow side end face 11 to the first outflow side end face 12 are provided. The first honeycomb base material 15 having the lattice-shaped partition walls 14 made of a porous material for partitioning and forming a plurality of cells 13 up to and including the plurality of cells 13 is provided. Both end faces 11 and 12 of which both ends of the cell 13 are not closed by 26 are open. Here, the value of the ratio (=L1/D1) of the length L1 of the honeycomb catalyst body 10 in the central axis direction (see the dashed line A in FIG. 1) to the diameter D1 of the honeycomb catalyst body 10 is 0.1 to 0. It is set to be in the range of 0.6. This ratio is more preferably in the range of 0.15 to 0.35, and particularly preferably in the range of 0.2 to 0.3.

上記長さの比の値が０．１未満の場合、排気ガスＥＧが第一ハニカム基材１５内に滞留する時間が短くなり、排気ガスＥＧの熱によってハニカム触媒体１０が十分な温度まで昇温せず、エンジン始動直後における浄化性能が十分な効果を発揮しないおそれがある。一方、係る比が０．６超の場合、ハニカム触媒体１０の重量が嵩み、重くなる。すなわち、密度が大きくなりすぎ、排気ガスＥＧの熱によってハニカム触媒体１０の触媒が十分に活性する温度に到達するまでに時間を要し、排気ガスＥＧの浄化性能が十分に発揮されない可能性がある。そのため、係る比の値が上記範囲内となるように規定されている。 When the value of the length ratio is less than 0.1, the exhaust gas EG stays in the first honeycomb substrate 15 for a shorter time, and the heat of the exhaust gas EG raises the temperature of the honeycomb catalyst body 10 to a sufficient temperature. There is a possibility that the purification performance immediately after the engine is started does not exhibit sufficient effects without heating. On the other hand, when the ratio is more than 0.6, the honeycomb catalyst body 10 becomes heavy and heavy. That is, the density becomes too high, it takes time until the temperature of the catalyst of the honeycomb catalyst body 10 is sufficiently activated by the heat of the exhaust gas EG, and the purification performance of the exhaust gas EG may not be sufficiently exhibited. is there. Therefore, the value of the ratio is specified to be within the above range.

更に、ハニカム触媒体１０と目封止ハニカム構造体２０との関係において、ハニカム触媒体１０の第一ハニカム基材１５の隔壁１４の気孔率は、目封止ハニカム構造体２０の第二ハニカム基材２５の隔壁２４の気孔率に対して小さくなるように設定されている。また、目封止ハニカム構造体２０の中心軸方向（一点鎖線Ａ）の長さＬ２に対するハニカム触媒体１０の中心軸方向の長さＬ１の比（＝Ｌ１／Ｌ２）の値が、０．１〜０．５に設定される。 Further, in the relationship between the honeycomb catalyst body 10 and the plugged honeycomb structure 20, the porosity of the partition walls 14 of the first honeycomb base material 15 of the honeycomb catalyst body 10 is determined by the second honeycomb base material of the plugged honeycomb structure 20. It is set to be smaller than the porosity of the partition wall 24 of the material 25. The value of the ratio (=L1/L2) of the length L1 of the honeycomb catalyst body 10 in the central axis direction to the length L2 of the plugged honeycomb structure 20 in the central axis direction (dashed line A) is 0.1. Set to ~0.5.

ハニカム触媒体１０のセル１３は、第一流入側端面１１から第一流出側端面１２まで延びる排気ガスＥＧの流れる流路が確保されており、目封止ハニカム構造体２０のように目封止部２６によってセル１３が塞がれていない。そのため、ハニカム触媒体１０の隔壁１４に比較的多量の触媒を担持した場合であっても、ハニカム触媒体１０の全体として圧力損失の低下を招来することがない。 The cells 13 of the honeycomb catalyst body 10 are provided with a flow path of the exhaust gas EG extending from the first inflow side end surface 11 to the first outflow side end surface 12, and are plugged like the plugged honeycomb structure 20. The cell 13 is not blocked by the portion 26. Therefore, even when a relatively large amount of catalyst is carried on the partition walls 14 of the honeycomb catalyst body 10, the pressure loss of the honeycomb catalyst body 10 as a whole does not decrease.

例えば、ハニカム触媒体１０の隔壁１４に担持される触媒の単位体積当たりの担持量は、２００〜４００ｇ／Ｌの範囲となるように調整することができる。なお、目封止ハニカム構造体２０の隔壁２４は、触媒が担持されている、或いは担持されていない、のいずれであっても構わない。このとき、目封止ハニカム構造体２０の隔壁２４に対する担持量は、１０〜１２０ｇ／Ｌの範囲となるように調整され、ハニカム触媒体１０の隔壁１４に対する単位体積当たりの触媒の担持量よりも小さくする必要がある。かかる程度に担持量を抑えることで、目封止ハニカム構造体２０における触媒による圧力損失の影響を小さくすることができる。 For example, the amount of the catalyst supported on the partition walls 14 of the honeycomb catalyst body 10 per unit volume can be adjusted to be in the range of 200 to 400 g/L. The partition walls 24 of the plugged honeycomb structure 20 may or may not support a catalyst. At this time, the loading amount of the plugged honeycomb structure 20 on the partition walls 24 is adjusted to be in the range of 10 to 120 g/L, and is larger than the loading amount of the catalyst per unit volume on the partition walls 14 of the honeycomb catalyst body 10. Need to be small. By suppressing the supported amount to such an extent, it is possible to reduce the influence of the pressure loss due to the catalyst in the plugged honeycomb structure 20.

更に、ハニカム触媒体１０に担持される触媒の単位体積当たりの担持量は、前述のように、２００〜４００ｇ／Ｌの範囲に設定され、２００〜３００ｇ／Ｌであることが更に好ましく、２００〜２５０ｇ／Ｌの範囲であることが特に好ましい。ここで、担持量が２００ｇ／Ｌ未満であると、隔壁１４に担持された触媒の担持量が不足するため、触媒活性反応の起因する熱量の発生が抑えられ、触媒が活性を示す温度までハニカム触媒体が昇温するのに多くの時間を要する可能性がある。そのため、エンジンの始動開始直後からの効率的な排気ガスＥＧの浄化が困難となる。一方、４００ｇ／Ｌを超える量の触媒を担持した場合、セル１３の流路が狭くなるおそれがあり、ハニカム触媒体１０の全体において圧力損失が高くなるおそれがある。そこで、上記範囲に担持量が含まれるように調整が行われる。 Further, the amount of the catalyst supported on the honeycomb catalyst body 10 per unit volume is set in the range of 200 to 400 g/L, and more preferably 200 to 300 g/L, as described above. The range of 250 g/L is particularly preferable. Here, when the supported amount is less than 200 g/L, the supported amount of the catalyst supported on the partition wall 14 is insufficient, so that the generation of heat due to the catalytic activation reaction is suppressed, and the honeycomb is heated up to a temperature at which the catalyst shows activity. It may take a long time for the temperature of the catalyst body to rise. Therefore, it becomes difficult to efficiently purify the exhaust gas EG immediately after the start of the engine. On the other hand, when the amount of the catalyst loaded exceeds 400 g/L, the flow path of the cell 13 may be narrowed, and the pressure loss may increase in the entire honeycomb catalyst body 10. Therefore, the adjustment is performed so that the carried amount falls within the above range.

図３は、排気ガス浄化装置１に使用されるハニカム触媒体１０の第一流入側端面１１を示す平面図である。なお、ハニカム触媒体１０の外観形状は、上記円柱状のものに限定されるものではなく、例えば，楕円柱状、四角柱状等のものであっても構わない。更に、ハニカム触媒体１０の大きさは、特に限定されるものではなく、例えば、中心軸方向の長さＬ１が３０〜２００ｍｍのものが挙げられる。 FIG. 3 is a plan view showing the first inflow side end surface 11 of the honeycomb catalyst body 10 used in the exhaust gas purification device 1. The external shape of the honeycomb catalyst body 10 is not limited to the cylindrical shape, and may be, for example, an elliptic cylinder shape, a quadrangular prism shape, or the like. Furthermore, the size of the honeycomb catalyst body 10 is not particularly limited, and examples thereof include those having a length L1 in the central axis direction of 30 to 200 mm.

ハニカム触媒体１０の第一ハニカム基材１５の隔壁１４の隔壁厚さは、５０．８〜１０１．６μｍの範囲のものが好ましく、５０．８〜７５μｍの範囲のものが更に好ましく、６５〜７５μｍの範囲のものが特に好ましい。５０．８μｍ未満であると、ハニカム触媒体１０の強度が低下するおそれがある。一方、１０１．６μｍを超えると、排気ガスＥＧがセル１３内を通過するときの圧力損失が大きくなる可能性が高い。なお、隔壁厚さは、中心軸方向に平行な断面を顕微鏡観察によって測定した値である。 The partition wall thickness of the partition walls 14 of the first honeycomb base material 15 of the honeycomb catalyst body 10 is preferably in the range of 50.8 to 101.6 μm, more preferably in the range of 50.8 to 75 μm, and preferably 65 to 75 μm. Those in the range of are particularly preferable. If the thickness is less than 50.8 μm, the strength of the honeycomb catalyst body 10 may decrease. On the other hand, when it exceeds 101.6 μm, the pressure loss when the exhaust gas EG passes through the inside of the cell 13 is likely to be large. The partition wall thickness is a value measured by observing a cross section parallel to the central axis direction with a microscope.

ハニカム触媒体１０の第一ハニカム基材１５の隔壁１４の気孔率は、目封止ハニカム構造体２０の第二ハニカム基材２５の隔壁２４の気孔率よりも小さく設定されている。これにより、ハニカム触媒体１０の強度を確保することができる。ハニカム触媒体１０の第一流入側端面１１における開口率が、目封止ハニカム構造体２０の第二流入側端面２１における開口率よりも大きい場合、ハニカム触媒体１０の熱容量が目封止ハニカム構造体の２０の熱容量に比べて小さくなるため、ハニカム触媒体１０の方が目封止ハニカム構造体２０に比べて昇温速度が速い。しかしながら、ハニカム触媒体１０の硬度が十分でなくなるおそれがある。 The porosity of the partition walls 14 of the first honeycomb base material 15 of the honeycomb catalyst body 10 is set to be smaller than the porosity of the partition walls 24 of the second honeycomb base material 25 of the plugged honeycomb structure 20. Thereby, the strength of the honeycomb catalyst body 10 can be secured. When the opening ratio of the first inflow-side end face 11 of the honeycomb catalyst body 10 is larger than the opening ratio of the second inflow-side end face 21 of the plugged honeycomb structure 20, the heat capacity of the honeycomb catalyst body 10 is a plugged honeycomb structure. Since the heat capacity of the body 20 is smaller than that of the body 20, the honeycomb catalyst body 10 has a higher temperature rising rate than the plugged honeycomb structure 20. However, the hardness of the honeycomb catalyst body 10 may become insufficient.

そこで、隔壁１４の気孔率を、隔壁２４の気孔率よりも小さくすることが好ましい。更に、ハニカム触媒体１０が速やかに昇温するため、排気ガスＥＧの熱を利用してハニカム触媒体１０を昇温させることが可能となり、これに伴って目封止ハニカム構造体２０を速やかに昇温させることができる。 Therefore, it is preferable to make the porosity of the partition wall 14 smaller than that of the partition wall 24. Further, since the temperature of the honeycomb catalyst body 10 is rapidly raised, it is possible to raise the temperature of the honeycomb catalyst body 10 by utilizing the heat of the exhaust gas EG, and accordingly, the plugged honeycomb structure 20 is rapidly raised. The temperature can be raised.

隔壁１４の気孔率は、特に限定されるものではないが、例えば、２０〜５０％の範囲であることが好ましく、２５〜３８％の範囲であることが更に好ましく、２５〜３０％の範囲であることが特に好ましい。気孔率が２０％未満の場合、圧力損失が増大するおそれがあり、一方、５０％超の場合、ハニカム触媒体１０が脆くなり、欠落しやすくなる。なお、隔壁１４の気孔率は、水銀ポロシメータにより測定した値である。 The porosity of the partition walls 14 is not particularly limited, but is preferably in the range of 20 to 50%, more preferably in the range of 25 to 38%, and in the range of 25 to 30%. It is particularly preferable that When the porosity is less than 20%, the pressure loss may increase. On the other hand, when it exceeds 50%, the honeycomb catalyst body 10 becomes brittle and is likely to be lost. The porosity of the partition wall 14 is a value measured by a mercury porosimeter.

上記気孔率の隔壁１４において、隔壁１４の平均細孔径は、５〜３０μｍであることが好ましく、１０〜２５μｍの範囲であることが更に好ましい。隔壁１４の平均細孔径が５μｍ未満であると、触媒と隔壁１４の表面との密着性が十分に得られず、触媒層が剥離するおそれがある。一方、３０μｍ超であると、ハニカム触媒体１０が脆くなり、欠落しやすくなる。隔壁１４の平均細孔径は、気孔率と同様に、水銀ポロシメータにより測定した値である。 In the partition wall 14 having the above porosity, the average pore diameter of the partition wall 14 is preferably 5 to 30 μm, and more preferably 10 to 25 μm. When the average pore diameter of the partition wall 14 is less than 5 μm, sufficient adhesion between the catalyst and the surface of the partition wall 14 cannot be obtained, and the catalyst layer may peel off. On the other hand, when it is more than 30 μm, the honeycomb catalyst body 10 becomes brittle and is likely to be chipped. The average pore diameter of the partition wall 14 is a value measured by a mercury porosimeter, like the porosity.

ハニカム触媒体１０を構成する第一ハニカム基材１５は、セラミックを主成分とするものである。隔壁１４の材質としては、例えば、炭化珪素、珪素−炭化珪素系複合材料、コージェライト、ムライト、アルミナ、スピネル、炭化珪素−コージェライト系複合材料、リチウムアルミニウムシリケート、及びアルミニウムチタネートからなる群から選択される少なくとも一種であることが好ましい。これらの中でも、熱膨張係数が小さく、かつ耐熱衝撃性に優れるコージェライトを使用して第一ハニカム基材１５を構成することが特に好ましい。 The first honeycomb base material 15 forming the honeycomb catalyst body 10 is mainly composed of ceramic. The material of the partition wall 14 is selected from the group consisting of, for example, silicon carbide, silicon-silicon carbide based composite material, cordierite, mullite, alumina, spinel, silicon carbide-cordierite based composite material, lithium aluminum silicate, and aluminum titanate. It is preferable that it is at least one of the following. Among these, it is particularly preferable to form the first honeycomb substrate 15 by using cordierite having a small thermal expansion coefficient and excellent thermal shock resistance.

加えて、ハニカム触媒体は、その最外周に外周壁を有するものであっても構わない。外周壁は、成形の際に多孔質基材と一体的に形成される成形一体壁であることが特に好適であるとともに、多孔質基材の外周を研削した後、セラミックセメント等で外周壁を構築するものであってもよい。なお、成形一体壁の場合、ハニカム触媒体１０と同じ材質であることが好ましく、一方、セラミックセメント等で外周壁を構築する場合、共素地にガラス等のフラックス成分等を加えた材料を使用するものであってもよい。 In addition, the honeycomb catalyst body may have an outer peripheral wall on the outermost periphery thereof. It is particularly preferable that the outer peripheral wall is a molded integral wall that is integrally formed with the porous base material during molding, and after grinding the outer periphery of the porous base material, the outer peripheral wall is formed with ceramic cement or the like. It may be constructed. In the case of a molded integral wall, the same material as that of the honeycomb catalyst body 10 is preferable. On the other hand, when the outer peripheral wall is constructed of ceramic cement or the like, a material obtained by adding a flux component such as glass to a co-base is used. It may be one.

第一ハニカム基材１５に担持される触媒としては、例えば、「三元触媒」を用いることができる。三元触媒は、主に炭化水素（ＨＣ）、一酸化炭素（ＣＯ）、及び窒素酸化物（ＮＯｘ）を浄化する触媒であり、例えば、白金（Ｐｔ）、パラジウム（Ｐｄ）、ロジウム（Ｒｈ）を含むものであっても構わない。三元触媒により、炭化水素は水と二酸化炭素に、一酸化炭素は二酸化炭素に、窒素酸化物は窒素にそれぞれ酸化または還元反応によって浄化される。 As the catalyst supported on the first honeycomb substrate 15, for example, a “three-way catalyst” can be used. The three-way catalyst is a catalyst that mainly purifies hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO x ), and for example, platinum (Pt), palladium (Pd), rhodium (Rh). ) May be included. The three-way catalyst purifies hydrocarbons into water and carbon dioxide, carbon monoxide into carbon dioxide, and nitrogen oxides into nitrogen by an oxidation or reduction reaction, respectively.

［３］目封止ハニカム構造体：
図４及び図５は、排気ガス浄化装置１に使用される目封止ハニカム構造体２０の第二流入側端面２１（図４）及び第二流出側端面２２（図５）を示す平面図であり、本実施形態において目封止ハニカム構造体２０は、円柱状の構造を呈するものである。目封止ハニカム構造体２０の大きさは、例えば、中心軸方向の長さＬ２が５０〜２００ｍｍのものが挙げられる。また、目封止ハニカム構造体２０の直径Ｄ２は、８０〜１８０ｍｍであるものが好適である。 [3] Plugged honeycomb structure:
4 and 5 are plan views showing the second inflow side end face 21 (FIG. 4) and the second outflow side end face 22 (FIG. 5) of the plugged honeycomb structure 20 used in the exhaust gas purification device 1. Thus, in the present embodiment, the plugged honeycomb structure 20 has a columnar structure. The size of the plugged honeycomb structure 20 is, for example, one having a length L2 in the central axis direction of 50 to 200 mm. Moreover, the diameter D2 of the plugged honeycomb structure 20 is preferably 80 to 180 mm.

目封止ハニカム構造体２０の第二ハニカム基材２５の隔壁２４の隔壁厚さは、１２７〜５０８μｍの範囲のものが好ましく、２５０〜４００μｍであることが更に好ましく、２５０〜３５０μｍの範囲のものが特に好ましい。１２７μｍ未満であると、目封止ハニカム構造体２０の強度が低下するおそれがある。一方、５０８μｍを超えると、排気ガスＥＧがセル２３内を通過するときの圧力損失が大きくなる可能性が高い。なお、隔壁厚さは、中心軸方向に平行な断面を顕微鏡観察によって測定した値である。 The partition wall thickness of the partition wall 24 of the second honeycomb substrate 25 of the plugged honeycomb structure 20 is preferably in the range of 127 to 508 μm, more preferably 250 to 400 μm, and in the range of 250 to 350 μm. Is particularly preferable. If it is less than 127 μm, the strength of the plugged honeycomb structure 20 may be reduced. On the other hand, if it exceeds 508 μm, the pressure loss when the exhaust gas EG passes through the inside of the cell 23 is likely to increase. The partition wall thickness is a value measured by observing a cross section parallel to the central axis direction with a microscope.

第二ハニカム基材２５の隔壁２４の気孔率は、特に限定されるものではないが、例えば、３５〜８０％の範囲であることが好ましく、３８〜６５％の範囲であることが更に好ましく、４５〜６５％の範囲であることが特に好ましい。気孔率が３５％未満の場合、圧力損失が増大するおそれがあり、一方、８０％超の場合、目封止ハニカム構造体２０が脆くなり、欠落しやすくなる。なお、隔壁２４の気孔率は、水銀ポロシメータにより測定した値である。上記範囲において、前述のように隔壁２４に対して隔壁１４の気孔率が小さくなるように設定されている。上記気孔率の隔壁２４において、隔壁２４の平均細孔径は、７〜４０μｍであることが好ましく、８〜３５μｍの範囲であることが更に好ましい。隔壁２４の平均細孔径が７μｍ未満であると、粒子状物質の堆積が少ない場合でも圧力損失が増大するおそれがある。一方、４０μｍ超であると、目封止ハニカム構造体２０が脆くなり、欠落しやすくなり、粒子状物質の捕集性能が低下する可能性が高い。隔壁２４の平均細孔径は、気孔率と同様に、水銀ポロシメータにより測定した値である。 The porosity of the partition walls 24 of the second honeycomb substrate 25 is not particularly limited, but is preferably in the range of 35 to 80%, more preferably 38 to 65%, for example. The range of 45 to 65% is particularly preferable. If the porosity is less than 35%, the pressure loss may increase. On the other hand, if it exceeds 80%, the plugged honeycomb structure 20 becomes fragile and is likely to be missing. The porosity of the partition wall 24 is a value measured by a mercury porosimeter. Within the above range, the porosity of the partition wall 14 is set smaller than that of the partition wall 24 as described above. In the partition wall 24 having the above porosity, the average pore diameter of the partition wall 24 is preferably 7 to 40 μm, and more preferably 8 to 35 μm. If the average pore diameter of the partition wall 24 is less than 7 μm, the pressure loss may increase even if the amount of particulate matter deposited is small. On the other hand, when it is more than 40 μm, the plugged honeycomb structure 20 becomes brittle and is liable to be lost, and there is a high possibility that the particulate matter collecting performance is deteriorated. The average pore diameter of the partition wall 24 is a value measured by a mercury porosimeter, like the porosity.

第二ハニカム基材２５は、第二流入側端面２１の直径Ｄ２に対する中心軸方向の長さＬ２の比（＝Ｌ２／Ｄ２）の値が、０．５〜１．５の範囲であることが好ましく、０．８〜１．５の範囲であることが更に好ましく、１．１〜１．３の範囲であることが特に好ましい。ここで、かかる比が０．５未満であると、第二ハニカム基材２５の中心軸方向の長さが短くなり過ぎるため、濾過可能面積が小さくなり、排気ガスＥＧに含まれる粒子状物質等の捕集効率が悪化し、かつ圧力損失が上昇するおそれがある。一方、当該比の値が、１．５を超える場合、第二ハニカム基材２５の中心軸方向の長さＬ２が長すぎるため、セル２３における圧力損失が増大し、目封止ハニカム構造体２０の全体の圧力損失が過大になるおそれがある。 In the second honeycomb base material 25, the value of the ratio (=L2/D2) of the length L2 in the central axis direction to the diameter D2 of the second inflow side end face 21 is in the range of 0.5 to 1.5. The range of 0.8 to 1.5 is more preferable, and the range of 1.1 to 1.3 is particularly preferable. Here, if the ratio is less than 0.5, the length of the second honeycomb substrate 25 in the central axis direction becomes too short, so that the filterable area becomes small, and the particulate matter and the like contained in the exhaust gas EG. There is a possibility that the collection efficiency of the will deteriorate and the pressure loss will increase. On the other hand, when the value of the ratio exceeds 1.5, the length L2 of the second honeycomb base material 25 in the central axis direction is too long, so that the pressure loss in the cells 23 increases and the plugged honeycomb structure 20. There is a risk that the overall pressure loss of will be excessive.

第二ハニカム基材２５は、セラミックを主成分とするものであり、前述した第一ハニカム基材１５と同様のものを使用することができる。更に、ハニカム触媒体１０と同様に、目封止ハニカム構造体２０もその最外周に外周壁を有するものであっても構わない。更に、第二ハニカム基材２５の隔壁２４に担持される触媒としては、第一ハニカム基材１５と同様に「三元触媒」の使用が例示される。 The second honeycomb base material 25 has a ceramic as a main component, and the same material as the first honeycomb base material 15 described above can be used. Further, similarly to the honeycomb catalyst body 10, the plugged honeycomb structure 20 may also have an outer peripheral wall on the outermost periphery thereof. Further, as the catalyst supported on the partition walls 24 of the second honeycomb base material 25, the use of “three-way catalyst” is exemplified as in the case of the first honeycomb base material 15.

［４］目封止部の配設基準（パターン）：
本実施形態の排気ガス浄化装置１における目封止ハニカム構造体２０の第二流入側端面２１及び／または第二流出側端面２２のセル２３を目封止する目封止部２６の配設基準として、図４及び図５に示すように、所謂「市松模様（またはチェッカーボードパターン）」のように第二流入側端面２１の全面に亘って格子状に目封止部２６を配設し（第一パターンＰ１）、一方、第二流出側端面２２の端面中心領域Ｃに限定して同様の配設基準で目封止部２６を配設したもの（第二パターンＰ２）を例示した。しかしながら、本発明の排気ガス浄化装置１において、端面中心領域Ｃ及び端面外周領域Ｏの間で圧力損失に差を生じさせることができ、かつ排気ガスＥＧが流れ込み易い端面中心領域Ｃの圧力損失を端面外周領域Ｏよりも大きなものであれば、目封止部２６の配設基準は特に限定されるものではない。 [4] Arrangement standard (pattern) of plugged portions:
Arrangement standard of the plugging portion 26 that plugs the cells 23 of the second inflow side end face 21 and/or the second outflow side end face 22 of the plugged honeycomb structure 20 in the exhaust gas purification device 1 of the present embodiment. As shown in FIGS. 4 and 5, the plugging portions 26 are arranged in a grid pattern over the entire surface of the second inflow side end face 21 like a so-called “checkerboard pattern (or checkerboard pattern)” ( The first pattern P1), on the other hand, is limited to the end face central region C of the second outflow side end face 22, and the plugging portions 26 are arranged according to the same arrangement standard (second pattern P2). However, in the exhaust gas purifying apparatus 1 of the present invention, it is possible to cause a difference in pressure loss between the end face center region C and the end face outer peripheral region O, and to reduce the pressure loss of the end face center region C where the exhaust gas EG easily flows. The arrangement standard of the plugging portions 26 is not particularly limited as long as it is larger than the end surface outer peripheral region O.

例えば、第二流入側端面２１及び第二流出側端面２２のそれぞれの端面中心領域Ｃに限定して、市松模様の配設基準にしたがった格子状の目封止部を設けるものであっても、或いは、前述した本実施形態における第二流入側端面２１及び第二流出側端面２２の目封止部２６の第一パターンＰ１及び第二パターンＰ２を逆転させたものであっても構わない。いずれの場合であっても、端面中心領域Ｃの圧力損失が端面外周領域Ｏの圧力損失より大きくすることができる。その結果、目封止ハニカム構造体２０の端面中心領域Ｃに偏って排気ガスＥＧが流れることがなく、第二流入側端面２１及び／また第二流出側端面２２の全体に亘って均一に排気ガスＥＧを流すことができる。更に、目封止ハニカム構造体２０の上流の位置に配設されたハニカム触媒体１０における排気ガスＥＧの流れを併せて制御することができ、目封止ハニカム構造体２０と同様に、端面中心領域Ｃに偏って排気ガスＥＧが流れることを抑制できる。 For example, a grid-like plugging portion according to a checkerboard pattern arrangement reference may be provided only in the end face center regions C of the second inflow side end face 21 and the second outflow side end face 22. Alternatively, the first pattern P1 and the second pattern P2 of the plugged portions 26 of the second inflow side end surface 21 and the second outflow side end surface 22 in the present embodiment described above may be reversed. In any case, the pressure loss in the end face center region C can be made larger than the pressure loss in the end face outer peripheral region O. As a result, the exhaust gas EG does not flow unevenly in the end face central region C of the plugged honeycomb structure 20, and the exhaust gas is exhausted uniformly over the entire second inflow side end face 21 and/or the second outflow side end face 22. The gas EG can flow. Furthermore, the flow of the exhaust gas EG in the honeycomb catalyst body 10 arranged at the upstream position of the plugged honeycomb structure 20 can be controlled together, and like the plugged honeycomb structure 20, the center of the end face can be controlled. It is possible to suppress the exhaust gas EG from flowing unevenly in the region C.

更に、上記第一パターンＰ１及び第二パターンＰ２以外の目封止部２６の配設基準の別例構成について図６〜９に示す。なお、図６〜９において、図示を簡略化するため、第二流入側端面２１に配設されるセル２３及びセル２３を目封止した目封止部２６を模式的に示す。ここで、図６〜９の紙面左方側が圧力損失の大きい端面中心領域Ｃ側を表し、紙面右方側が圧力損失の小さい端面外周領域Ｏ側を表している。更に、各領域Ｃ，Ｏのおおよその境界を示すため、中央付近に破線からなる領域境界線Ｍを示している。図６〜９において、黒色塗りつぶしのハッチングを施した箇所がセル２３を目封止した目封止部２６を示している。 6 to 9 show another example of the arrangement reference of the plugging portions 26 other than the first pattern P1 and the second pattern P2. 6 to 9, for simplification of illustration, the cells 23 arranged on the second inflow side end face 21 and the plugging portion 26 obtained by plugging the cells 23 are schematically shown. Here, the left side of the paper surface of FIGS. 6 to 9 represents the end face central region C side where the pressure loss is large, and the right side of the paper surface represents the end face outer peripheral region O side where the pressure loss is small. Further, in order to show an approximate boundary between the areas C and O, an area boundary line M composed of a broken line is shown near the center. In FIGS. 6 to 9, a black-filled portion indicates a plugged portion 26 that plugs the cells 23.

図６に示す第三パターンＰ３は、端面中心領域Ｃに、第二流入側端面２１と第二流出側端面２２との間でセル２３ｃの断面形状を異ならせた構造（ＨＡＣ構造：Ｈｉｇｈ Ａｓｈ Ｃａｐａｃｉｔｙ構造）を採用し、端面外周領域Ｏに前述の市松模様の格子状の目封止部２６を配設したものである。ここで、ＨＡＣ構造のセル２３ｃは、四角形状のセルの四隅を切り落とし、断面八角形状にしたものである。このとき、第二流入側端面２１のセル２３に対して目封止部２６が配設された場合、第二流出側端面２２の断面八角形状の残余のセル（図示しない）に対して目封止部２６が配設されている。その結果、ＨＡＣ構造を採用した配設基準で目封止された端面中心領域Ｃは、第二流出側端面２２で四角形状のセルに比べて目封止される面積が大きな断面八角形状のセルが目封止されているため、互いのセルの開口率が異なることにより、端面外周領域Ｏと比べて圧力損失が大きなものとなる。したがって、圧力損失差に起因する排気ガスＥＧの端面外周領域Ｏ側への誘導が可能となる。更に、目封止ハニカム構造体２０の上流の位置に配設されたハニカム触媒体１０における排気ガスＥＧの流れを制御し、端面外周領域側へ誘導することができる。 The third pattern P3 shown in FIG. 6 has a structure in which the cross-sectional shape of the cell 23c is different between the second inflow side end surface 21 and the second outflow side end surface 22 in the end surface center region C (HAC structure: High Ash Capacity). (Structure) is adopted, and the checkered grid-like plugging portions 26 are arranged in the outer peripheral region O of the end face. Here, the cell 23c having the HAC structure is formed by cutting off the four corners of a rectangular cell to form an octagonal cross section. At this time, when the plugging portion 26 is provided for the cell 23 of the second inflow side end face 21, the plugging is performed for the remaining cells (not shown) having the octagonal cross section of the second outflow side end face 22. A stop 26 is provided. As a result, the end face central region C, which is plugged according to the arrangement standard that adopts the HAC structure, has an octagonal cross section in which the second outflow side end face 22 has a larger area to be plugged than a square cell. Since the cells are plugged, the opening ratios of the cells are different from each other, so that the pressure loss becomes larger than that in the end surface outer peripheral region O. Therefore, it becomes possible to guide the exhaust gas EG to the side of the end surface outer peripheral region O due to the pressure loss difference. Further, the flow of the exhaust gas EG in the honeycomb catalyst body 10 arranged at the upstream position of the plugged honeycomb structure 20 can be controlled and guided to the end face outer peripheral region side.

図７に示す第四パターンＰ４は、端面中心領域Ｃにおいて図６と同様のＨＡＣ構造を採用し、更に、端面外周領域ＯにはＨＡＣ構造を逆転させ、断面八角形状のセル２３ｄを目封止した逆ＨＡＣ構造を採用したものである。図８に示す第五パターンＰ５は、図６及び図７と異なり、端面中心領域Ｃにおいて、目封止部２６を配設したセル２３ａの下段に位置するセル２３ｄに対して目封止部２６を設けず、更に下段に位置するセル２３ｅに一つずつずらして交互に目封止部２６を配設したものである。一方、端面外周領域Ｏは、前述した市松模様の格子状の目封止部２６を配設したものである。図９に示す第六パターンＰ６は、図８の端面中心領域Ｃと同様の第五パターンＰ５を端面中心領域Ｃに採用し、更に端面外周領域Ｏに図８の端面中心領域Ｃの逆構造のパターンを採用したものである。 The fourth pattern P4 shown in FIG. 7 adopts the same HAC structure as in FIG. 6 in the end face center region C, and further reverses the HAC structure in the end face outer peripheral region O to plug the cells 23d having an octagonal cross section. The reverse HAC structure is adopted. The fifth pattern P5 shown in FIG. 8 is different from FIG. 6 and FIG. 7 in the end face center region C with respect to the cells 23d located in the lower stage of the cells 23a in which the plugging portions 26 are arranged. No cells are provided, and the plugging portions 26 are alternately arranged one by one in the cells 23e located in the lower stage. On the other hand, the end face outer peripheral region O is provided with the checkered grid-like plugging portions 26 described above. The sixth pattern P6 shown in FIG. 9 employs a fifth pattern P5 similar to the end face center region C of FIG. 8 as the end face center region C, and further has an end face outer peripheral region O of the reverse structure of the end face center region C of FIG. The pattern is adopted.

これらの構成は、第二流入側端面２１及び第二流出側端面２２のそれぞれにおいて、任意に設定することが可能である。 These configurations can be arbitrarily set in each of the second inflow side end surface 21 and the second outflow side end surface 22.

更に、本発明の排気ガス浄化装置に使用される目封止ハニカム構造体５０の別例構成として、図１０に示すような複数の角柱状のハニカムセグメント５１，５２を採用するものであっても構わない。具体的に説明すると、目封止ハニカム構造体５０は、縦２列及び横２列に組み合わせた合計４個の内側ハニカムセグメント５１と、断面正方形状に組み合わせた四つの内側ハニカムセグメント５１の周囲を取り囲むように配された合計１２個の外側ハニカムセグメント５２とを備え、最終的に１６個のハニカムセグメント５１，５２を用いて構築するものであっても構わない。 Further, as another configuration of the plugged honeycomb structure 50 used in the exhaust gas purifying apparatus of the present invention, a plurality of prismatic honeycomb segments 51, 52 as shown in FIG. 10 may be adopted. I do not care. Specifically, the plugged honeycomb structure 50 has a total of four inner honeycomb segments 51 combined in two columns and two rows and four inner honeycomb segments 51 combined in a square cross section. It is also possible to provide a total of twelve outer honeycomb segments 52 arranged so as to surround them, and finally construct using 16 honeycomb segments 51, 52.

ここで、内側ハニカムセグメント５１の第二流入側端面５３及び第二流出側端面５４の各セル５５には、それぞれ目封止部５６が市松模様となるように格子状に交互に一つおきに配設されている。一方、外側ハニカムセグメント５２には、第二流入側端面５３及び第二流出側端面５４の各セル５５にはいずれも目封止部５６が配設されておらず、外部に対して開口されている。ここで、４個の内側ハニカムセグメント５１の第二流入側端面５３及び第二流出側端面５４のいずれもが本発明における端面中心領域Ｃに相当し、一方、１２個の外側ハニカムセグメント５２の第二流入側端面５３及び第二流出側端面５４のいずれもが本発明における端面外周領域Ｏに相当する。上記構成とすることにより、内側ハニカムセグメント５１及び外側ハニカムセグメント５２の組み合わせにより、圧力損失差を容易に発生させることができる。 Here, in each of the cells 55 of the second inflow side end surface 53 and the second outflow side end surface 54 of the inner honeycomb segment 51, the plugging portions 56 are alternately arranged in a grid pattern so as to form a checkered pattern. It is arranged. On the other hand, in the outer honeycomb segment 52, the plugging portion 56 is not provided in each cell 55 of the second inflow side end surface 53 and the second outflow side end surface 54, and the cell is opened to the outside. There is. Here, each of the second inflow side end surface 53 and the second outflow side end surface 54 of the four inner honeycomb segments 51 corresponds to the end surface central region C in the present invention, while the twelve outer honeycomb segment 52 Both the second inflow side end surface 53 and the second outflow side end surface 54 correspond to the end surface outer peripheral region O in the present invention. With the above configuration, the pressure loss difference can be easily generated by the combination of the inner honeycomb segment 51 and the outer honeycomb segment 52.

加えて、本発明の別例構成として、図１１及び図１２に示すような排気ガス浄化装置６０を構成するものであってもよい。なお、図１１及び図１２において、既に説明した排気ガス浄化装置１と同一の構成については、同一番号を付し詳細な説明を省略するものとする。 In addition, as another example configuration of the present invention, an exhaust gas purification device 60 as shown in FIGS. 11 and 12 may be configured. 11 and 12, the same components as those of the exhaust gas purification device 1 described above are designated by the same reference numerals and detailed description thereof will be omitted.

別例構成の排気ガス浄化装置６０は、図１等で示した排気ガス浄化装置１の構成に加え、缶体３０の排気ガス流入部３１及びハニカム触媒体１０の第一流入側端面１１の間に、外周壁をなす円筒状部材６２に円形の孔部６３が複数穿設された円筒形状の整流部６１が取設されたものである。ここで、円筒形状の整流部６１の外径は、排気ガス流入部３１の流入口３３の内径と一致し、缶体３０の内部に導入された排気ガスＥＧは、整流部６１の内部を必ず通過するように制御される。更に、整流部６１は、高温の排気ガスＥＧに晒されても耐え得るようにステンレス等の金属製材料を用いて構成されている。 An exhaust gas purifying apparatus 60 having another configuration has a structure between the exhaust gas inflow portion 31 of the can body 30 and the first inflow side end surface 11 of the honeycomb catalyst body 10 in addition to the configuration of the exhaust gas purifying apparatus 1 shown in FIG. In addition, a cylindrical rectifying portion 61 having a plurality of circular hole portions 63 formed in a cylindrical member 62 forming an outer peripheral wall is attached. Here, the outer diameter of the cylindrical rectifying portion 61 is equal to the inner diameter of the inflow port 33 of the exhaust gas inflow portion 31, and the exhaust gas EG introduced into the inside of the can body 30 is sure to flow inside the rectifying portion 61. Controlled to pass. Further, the rectifying unit 61 is made of a metal material such as stainless steel so that it can withstand the high temperature exhaust gas EG.

上記した整流部６１を缶体３０の内部に備えることにより、流入口３３からハニカム触媒体１０の第一流入側端面１１の間の排気ガスＥＧの流れを制御することができる。更に具体的に説明すると、排気ガス浄化装置６０に導入された排気ガスＥＧの流量（或いは、流速）の違いによって、缶体３０の内部における当該排気ガスＥＧの挙動は変化する。すなわち、導入開始から所定の流量まで（＝低流量状態）の排気ガスＥＧは、缶体３０の内部をゆっくり進むため、流入口３３から拡径部３７の拡がりに沿ってハニカム触媒体１０の軸方向に直交する方向、換言すれば流入口３３から円錐形状に拡がる方向に沿って流れ易くなる。 By providing the rectifying section 61 described above inside the can body 30, the flow of the exhaust gas EG between the inflow port 33 and the first inflow side end surface 11 of the honeycomb catalyst body 10 can be controlled. More specifically, the behavior of the exhaust gas EG inside the can body 30 changes depending on the flow rate (or flow velocity) of the exhaust gas EG introduced into the exhaust gas purification device 60. That is, since the exhaust gas EG from the start of introduction to a predetermined flow rate (=low flow rate state) slowly advances inside the can body 30, the axis of the honeycomb catalyst body 10 extends from the inflow port 33 along the expansion of the expanded diameter portion 37. It becomes easy to flow along a direction orthogonal to the direction, in other words, a direction that spreads in a conical shape from the inflow port 33.

ここで、一般的な直噴式ガソリンエンジンの場合、エンジン始動時や始動直後の当該エンジンが十分に暖められていない状態のときに、スス等の粒子状物質の大部分が発生することが知られている。一方、エンジンの始動直後は、アクセルの開度を抑え、燃料供給量を低くしたアイドリング状態或いは低回転状態での駆動が行われる。そのため、排気ガス浄化装置６０に導入される排気ガスＥＧは低流量状態となる。したがって、係る低流量状態で発生した多量の粒子状物質を確実に捕集するため、目封止ハニカム構造体２０の目封止部２６が特に設けられた端面中心領域Ｃに向けて排気ガスＥＧを送る必要がある。 Here, in the case of a general direct-injection gasoline engine, it is known that most of particulate matter such as soot is generated when the engine is not sufficiently warmed at the time of starting the engine or immediately after the starting. ing. On the other hand, immediately after the engine is started, the engine is driven in an idling state or a low rotation state in which the accelerator opening is suppressed and the fuel supply amount is reduced. Therefore, the exhaust gas EG introduced into the exhaust gas purification device 60 is in a low flow rate state. Therefore, in order to reliably collect a large amount of the particulate matter generated in the low flow rate state, the exhaust gas EG is directed toward the end face central region C where the plugging portion 26 of the plugged honeycomb structure 20 is particularly provided. Need to send.

先に説明したように、端面中心領域Ｃに複数の目封止部２６が設けられ、一方、端面外周領域Ｏに目封止部２６が設けられていない配設基準に従った目封止ハニカム構造体２０（例えば、図５参照）は、それぞれの領域Ｃ，Ｏにおける圧力損失差が大きくなるため、排気ガスＥＧは端面外周領域Ｏに向かって流れ易くなる。その結果、低流量状態の際の目封止ハニカム構造体２０の捕集効率が著しく低下し、粒子状物質は十分に捕集されることなく、そのまま外部に放出される可能性が高くなる。この問題を本発明の別例構成の排気ガス浄化装置６０は解消することができる。 As described above, a plurality of plugged portions 26 are provided in the end face central region C, while the plugged portions 26 are not provided in the end face outer peripheral region O. In the structure 20 (see FIG. 5, for example), the difference in pressure loss between the regions C and O becomes large, so that the exhaust gas EG easily flows toward the end surface outer peripheral region O. As a result, the collection efficiency of the plugged honeycomb structure 20 in the low flow rate state is significantly reduced, and the particulate matter is likely to be discharged to the outside as it is without being sufficiently collected. This problem can be solved by the exhaust gas purification device 60 having another configuration according to the present invention.

すなわち、流入口３３及びハニカム触媒体１０の間に円筒形状の整流部６１を設けることによって、低流量状態のときの排気ガスＥＧの軸方向に直交する方向への拡がりを抑制し、ハニカム触媒体１０及び目封止ハニカム構造体２０の中央付近（端面中心領域Ｃ）に向けて排気ガスＥＧを導くことができる。一方、十分にエンジンが暖められ、高流量状態になった際には、整流部６１に設けられた複数の孔部６３から排気ガスＥＧの一部が軸方向に直交する方向に向かって分散して流れるように、排気ガスＥＧの流れを整えることができる。 That is, by providing the cylindrical rectifying portion 61 between the inflow port 33 and the honeycomb catalyst body 10, the spread of the exhaust gas EG in the direction orthogonal to the axial direction in the low flow rate state is suppressed, and the honeycomb catalyst body is suppressed. The exhaust gas EG can be guided toward the vicinity of the center of 10 and the plugged honeycomb structure 20 (end face center region C). On the other hand, when the engine is sufficiently warmed up to a high flow rate state, a part of the exhaust gas EG is dispersed from the plurality of holes 63 provided in the rectifying section 61 in a direction orthogonal to the axial direction. The flow of the exhaust gas EG can be adjusted so that the exhaust gas flows.

本発明の別例構成の排気ガス浄化装置６０に用いられる整流部６１は、図１１及び図１２に示したものに限定されるものではない。例えば、図１１等において、円筒状部材６２に複数の真円状の孔部６３を設けるものを示したが、これに限定されるものではなく、例えば、楕円孔、角孔、或いは線状孔など種々の形状のものを用いることが可能であり、低流量状態及び高流量状態のそれぞれにおいて、排気ガスＥＧの流れを整えることができるものであれば構わない。更に、円筒状部材６２に穿設する孔部６３の数、孔径等のサイズ、及び各孔部６３の配置（レイアウト）等に関しても任意に決定することができる。 The rectifying unit 61 used in the exhaust gas purifying apparatus 60 having another configuration of the present invention is not limited to the one shown in FIGS. 11 and 12. For example, in FIG. 11 and the like, the cylindrical member 62 is provided with a plurality of perfect circular holes 63, but the present invention is not limited to this. For example, an elliptical hole, a square hole, or a linear hole. Various shapes and the like can be used, and any shape that can regulate the flow of the exhaust gas EG in the low flow rate state and the high flow rate state can be used. Furthermore, the number of holes 63 formed in the cylindrical member 62, the size such as the hole diameter, the arrangement (layout) of the holes 63, and the like can be arbitrarily determined.

以下、本発明の排気ガス浄化装置の実施例について説明するが、本発明の排気ガス浄化装置は、これらの実施の形態に限定されるものではない。 Examples of the exhaust gas purifying apparatus of the present invention will be described below, but the exhaust gas purifying apparatus of the present invention is not limited to these embodiments.

本発明の排気ガス浄化装置の実施例１〜１８及び比較例１として、ハニカム触媒体の直径、長さ、Ｌ１／Ｄ１、セル密度、隔壁厚さ、気孔率、細孔径、及び触媒担持率と、目封止ハニカム構造体の直径、長さ、Ｌ１／Ｌ２、セル密度、隔壁厚さ、気孔率、細孔径、配設基準、及び触媒担持率と、ハニカム触媒体及び目封止ハニカム構造体の間の距離（担体間の距離）をまとめたものを下記の表１に示す。 As Examples 1 to 18 and Comparative Example 1 of the exhaust gas purifying apparatus of the present invention, the honeycomb catalyst body has a diameter, length, L1/D1, cell density, partition wall thickness, porosity, pore diameter, and catalyst loading rate. , Diameter and length of plugged honeycomb structure, L1/L2, cell density, partition wall thickness, porosity, pore diameter, placement standard, and catalyst loading rate, and honeycomb catalyst body and plugged honeycomb structure A summary of the distances (distances between carriers) is shown in Table 1 below.

比較例１は、目封止部を一つ置きに交互に配設した従来の配設基準のパターンで構成された目封止ハニカム構造体を用いた排気ガス浄化装置を示す。更に、実施例１及び実施例７〜１７は上記第三パターンＰ３の配設基準に従って目封止部が配設されたものを示し、実施例２は上記第四パターンＰ４、実施例３は上記第五パターンＰ５、及び実施例４は上記第六パターンＰ６の配設基準に従ってそれぞれ目封止部が配設されたものである。一方、実施例５は、第二流入側端面の全面に対して第一パターンＰ１で目封止部を配設し、第二流出側端面の中心付近にのみ第二パターンＰ２で目封止部を配設したものである。更に、実施例６は、第二流入側端面の中心付近にのみ第二パターンＰ２で目封止部を配設し、第二流出側端面の中心付近にのみ第二パターンＰ２で目封止部を配設したものである。 Comparative Example 1 shows an exhaust gas purifying apparatus using a plugged honeycomb structure having a conventional arrangement reference pattern in which every other plugging portion is alternately arranged. Furthermore, Example 1 and Examples 7 to 17 show that the plugging portions are arranged according to the arrangement standard of the third pattern P3, Example 2 is the fourth pattern P4, and Example 3 is the above. In the fifth pattern P5 and the fourth embodiment, the plugging portions are arranged according to the arrangement standard of the sixth pattern P6. On the other hand, in the fifth embodiment, the plugging portion is arranged on the entire surface of the second inflow side end surface by the first pattern P1, and the plugging portion is formed by the second pattern P2 only near the center of the second outflow side end surface. Is provided. Further, in the sixth embodiment, the plugging portion is arranged in the second pattern P2 only near the center of the second inflow side end face, and the plugging portion is formed in the second pattern P2 only near the center of the second outflow side end face. Is provided.

Figure 0006702823
Figure 0006702823

上記実施例１〜１８の排気ガス浄化装置に対し、以下に示す測定方法に従って、（１）浄化率、（２）ＰＭ排出個数、及び（３）圧力損失をそれぞれ計測し、（１）〜（３）の項目についてそれぞれ評価した。また、（１）〜（３）の評価を踏まえ、排気ガス浄化装置についての（４）総合評価を行った。 With respect to the exhaust gas purification devices of Examples 1 to 18 described above, (1) purification rate, (2) number of discharged PM, and (3) pressure loss were measured according to the following measurement methods, and (1) to ( Each item of 3) was evaluated. Further, based on the evaluations of (1) to (3), (4) comprehensive evaluation of the exhaust gas purification device was performed.

（１）浄化率の測定方法
上記の実施例及び比較例に係る排気ガス浄化装置を、排気量２．０リットルの直噴式ガソリンエンジンを搭載した乗用車の排気系にそれぞれ装着する。その後、シャシダイナモによる車両試験として、国際調和排ガス試験モード（ＷＬＴＣ）の運転条件に従って運転した際の排気ガス中の一酸化炭素（ＣＯ）、炭化水素（ＨＣ）、及び窒素酸化物（ＮＯｘ）のエミッションを測定し、エミッション値を得た。得られたエミッション値を、基準となる比較例１の値と対比し、一酸化炭素、炭化水素、及び窒素酸化物の全ての成分の値が２０％以下であるものを“Ａ”とし、５〜２０％の範囲のものを“Ｂ”とした。なお、表２において、浄化率の測定に係る評価項目を“浄化率（ＣＯ，ＨＣ，ＮＯｘ）”を表している。 (1) Method of Measuring Purification Rate The exhaust gas purification devices according to the above-described examples and comparative examples are mounted on the exhaust system of a passenger vehicle equipped with a direct injection gasoline engine having a displacement of 2.0 liters. Then, as a vehicle test using a chassis dynamo, carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NO x ) in the exhaust gas when operating according to the operating conditions of the International Harmonized Exhaust Gas Test Mode (WLTC) Emission was measured and the emission value was obtained. The obtained emission value is compared with the reference value of Comparative Example 1, and the value of all the components of carbon monoxide, hydrocarbon, and nitrogen oxide is 20% or less is "A". The range of up to 20% was designated as "B". In Table 2, "purification rate (CO, HC, NO x) " the evaluation items according to the measurement of the purifying rates represent.

（２）ＰＭ排出個数の測定方法
実施例及び比較例に係る排気ガス浄化装置を、排気量２．０リットルの直噴式ガソリンエンジンを搭載した乗用車の排気系に装着する。その後、シャシダイナモによる車両試験として、国際調和排ガス試験モード（ＷＬＴＣ）の運転条件に従って運転した際の排気ガス中のＰＭ排出個数を欧州ＥＵＲＯ６規制案に沿った方法に基づいて測定する。ここで、ＰＭ排出個数が３×１０１１個／ｋｍ以下のものを“Ａ”とし、３×１０１１〜６×１０１１個／ｋｍの範囲のものを“Ｂ”とした。 (2) Method of measuring the number of emitted PMs The exhaust gas purification devices according to the examples and comparative examples are mounted on the exhaust system of a passenger vehicle equipped with a direct injection gasoline engine having a displacement of 2.0 liters. After that, as a vehicle test using a chassis dynamo, the number of PM emissions in the exhaust gas when operating according to the operating conditions of the International Harmonized Exhaust Gas Test Mode (WLTC) is measured based on the method according to the European Euro 6 regulation proposal. Here, the PM discharge number of 3×10 11 pieces/km or less was “A”, and the range of 3×10 11 to 6×10 11 pieces/km was “B”.

（３）圧力損失の測定方法
排気量２．０リットルの直噴式ガソリンエンジンの台上試験において、始めに、排気系にセル密度：９３セル／ｃｍ２、隔壁厚さ：０．０７６ｍｍ、ハニカム径：１０５．７ｍｍ、ハニカム長さ：１１４ｍｍのフロースル型のハニカム構造体を装着する。このときのエンジンフルロード運転時の圧力損失を測定し、これを圧力損失の基準値とする。実施例及び比較例に係る排気ガス浄化装置を同様に排気量２．０リットルの直噴式ガソリンエンジンを搭載した乗用車の排気径に装着し、上記と同条件のエンジンフルロード運転時の圧力損失を測定した。その後、予め測定された圧力損失の基準値に対して、圧力損失の増加量が５ｋＰａ未満の場合を“Ａ”、圧力損失の増加量が１０ｋＰａ未満の場合を“Ｂ”とした。 (3) Method of measuring pressure loss In a bench test of a direct injection gasoline engine with a displacement of 2.0 liters, the exhaust system first had a cell density of 93 cells/cm 2 , a partition wall thickness of 0.076 mm, and a honeycomb diameter. A flow-through type honeycomb structure having a length of 105.7 mm and a honeycomb length of 114 mm is mounted. The pressure loss during full load operation of the engine at this time is measured and used as the reference value of the pressure loss. Similarly, the exhaust gas purifying apparatuses according to the examples and the comparative examples were mounted on the exhaust diameter of a passenger vehicle equipped with a direct injection gasoline engine having a displacement of 2.0 liters to reduce the pressure loss during engine full load operation under the same conditions as above. It was measured. Then, with respect to the reference value of the pressure loss measured in advance, the case where the increase amount of the pressure loss is less than 5 kPa was set to "A", and the case where the increase amount of the pressure loss was less than 10 kPa was set to "B".

（４）総合評価
上記の（１）浄化率（ＣＯ，ＨＣ，ＮＯｘ）、（２）ＰＭ排出個数、及び（３）圧力損失における各評価において、全ての評価がＡである場合は、総合評価“Ａ”とし、一つでもＢがある場合は、総合評価“Ｂ”とした。上記（１）〜（４）に係る評価結果をまとめたものを下記表２に示す。なお、比較例１については評価を省略している。また、上記（１）〜（４）の評価において、“Ａ”は「優良」、“Ｂ”は「可」を示し、Ｂの評価であっても実用上の十分な性能を有することを示す。 (4) Comprehensive evaluation In each evaluation in (1) purification rate (CO, HC, NO x ), (2) PM emission number, and (3) pressure loss, when all evaluations are A, The evaluation was “A”, and if there was even one B, the evaluation was “B”. Table 2 below shows a summary of the evaluation results according to (1) to (4) above. The evaluation of Comparative Example 1 is omitted. In addition, in the evaluations of (1) to (4) above, "A" indicates "excellent" and "B" indicates "acceptable", and even the evaluation of B indicates that it has sufficient practical performance. ..

Figure 0006702823
Figure 0006702823

（目封止部の配設基準：実施例１〜６）
表２に示すように、ハニカム触媒体及び目封止ハニカム構造体を同一とし、目封止部を第三パターンＰ３〜第六パターンＰ６とそれぞれ異なる配設基準で配した実施例１〜４の排気ガス浄化装置は、浄化率、ＰＭ排出個数、及び圧力損失がいずれも“Ａ”の評価であり、総合評価もＡであった。すなわち、本発明の排気ガス浄化装置において、先に提案した第三パターンＰ３〜第六パターンＰ６に係る目封止部の配設基準は、いずれも良好な浄化効率、低いＰＭ排出個数、及び低圧力損失の効果を有することが示された。一方、第一パターンＰ１及び第二パターンＰ２の組み合わせ（実施例５）、及び第二流入側端面及び第二流出側端面の中心をいずれも第二パターンＰ２の組合わせ（実施例６）の場合、Ｂの評価が得られた。 (Disposition standard of plugged portions: Examples 1 to 6)
As shown in Table 2, the honeycomb catalyst body and the plugged honeycomb structure are the same, and the plugged portions are arranged in the third pattern P3 to the sixth pattern P6 respectively according to different arrangement standards. The exhaust gas purifying apparatus was evaluated as "A" for the purification rate, the number of discharged PM, and the pressure loss, and the overall evaluation was also A. That is, in the exhaust gas purifying apparatus of the present invention, the disposition criteria of the plugging portions according to the third pattern P3 to the sixth pattern P6 proposed above are all good purifying efficiency, low PM emission number, and low PM emission number. It was shown to have the effect of pressure drop. On the other hand, in the case of the combination of the first pattern P1 and the second pattern P2 (Example 5), and the combination of the centers of the second inflow side end surface and the second outflow side end surface of the second pattern P2 (Example 6). , B was obtained.

（Ｌ１／Ｄ１、Ｌ１／Ｌ２の値：実施例７〜１０）
ハニカム触媒体の直径Ｄ１に対する中心軸方向の長さＬ１の比（＝Ｌ１／Ｄ１）が０．１〜０．６の範囲から外れる場合、及び目封止ハニカム構造体の中心軸方向の長さＬ２に対するハニカム触媒体の中心軸方向の長さＬ１の比（＝Ｌ１／Ｌ２）が０．１〜０．５の範囲から外れた排気ガス浄化装置（実施例７，８）の場合、浄化率（ＣＯ，ＨＣ，ＮＯｘ）の評価が“Ｂ”となった。本発明に規定されたＬ１／Ｄ１が０．１〜０．６、及び、Ｌ１／Ｌ２が０．１〜０．５の範囲の排気ガス浄化装置（実施例９，１０）の場合、浄化率（ＣＯ，ＨＣ，ＮＯｘ）の評価が“Ａ”となった。排気ガス浄化装置に使用されるハニカム触媒体の長さ及び直径の関係、ハニカム触媒体及び目封止ハニカム構造体の長さの関係が浄化率（ＣＯ，ＨＣ，ＮＯｘ）に影響を及ぼすことが確認された。 (Values of L1/D1 and L1/L2: Examples 7 to 10)
When the ratio (=L1/D1) of the length L1 in the central axis direction to the diameter D1 of the honeycomb catalyst body is out of the range of 0.1 to 0.6, and the length in the central axis direction of the plugged honeycomb structure When the ratio (=L1/L2) of the length L1 of the honeycomb catalyst body in the central axis direction to L2 is out of the range of 0.1 to 0.5, the purification rate is in the case of the exhaust gas purification devices (Examples 7 and 8). The evaluation of (CO, HC, NO x ) was “B”. In the case of the exhaust gas purifying device (Examples 9 and 10) having L1/D1 of 0.1 to 0.6 and L1/L2 of 0.1 to 0.5 defined in the present invention, the purification rate The evaluation of (CO, HC, NO x ) was “A”. The purification rate (CO, HC, NO x ) is affected by the relationship between the length and diameter of the honeycomb catalyst used in the exhaust gas purification device and the relationship between the length of the honeycomb catalyst and the length of the plugged honeycomb structure. Was confirmed.

（ハニカム触媒体の隔壁厚さ：実施例１１，１２）
ハニカム触媒体の隔壁厚さが１２７μｍの排気ガス浄化装置（実施例１１）の場合、浄化率（ＣＯ，ＨＣ，ＮＯｘ）の評価が“Ｂ”となった。一方、隔壁厚さが１０１μｍの排気ガス浄化装置（実施例１２）の場合、浄化率（ＣＯ，ＨＣ，ＮＯｘ）の評価が“Ａ”となった。ハニカム触媒体の隔壁厚さが浄化率（ＣＯ，ＨＣ，ＮＯｘ）の値に影響を及ぼすことが確認された。 (Thickness of partition wall of honeycomb catalyst: Examples 11 and 12)
In the case of the exhaust gas purifying apparatus (Example 11) in which the partition wall thickness of the honeycomb catalyst body was 127 μm, the purification rate (CO, HC, NO x ) was evaluated as “B”. On the other hand, in the case of the exhaust gas purification device having a partition wall thickness of 101 μm (Example 12), the evaluation of the purification rate (CO, HC, NO x ) was “A”. It was confirmed that the partition wall thickness of the honeycomb catalyst body affects the value of the purification rate (CO, HC, NO x ).

（目封止ハニカム構造体の気孔率：実施例１３）
ハニカム触媒体の隔壁の気孔率が、目封止ハニカム構造体の隔壁の気孔率より大きい排気ガス浄化装置（実施例１３）の場合、圧力損失が大きくなることが確認された。上流側のハニカム触媒体に対して、下流側の目封止ハニカム構造体の方が気孔率が小さいと、排気ガスの通気性が損なわれ、圧力損失が大きくなると考えられる。 (Porosity of plugged honeycomb structure: Example 13)
It was confirmed that in the case of the exhaust gas purifying apparatus (Example 13) in which the porosity of the partition walls of the honeycomb catalyst body was larger than the porosity of the partition walls of the plugged honeycomb structure (Example 13), the pressure loss was increased. If the porosity of the plugged honeycomb structure on the downstream side is smaller than that of the honeycomb catalyst on the upstream side, it is considered that the gas permeability of exhaust gas is impaired and the pressure loss increases.

（ハニカム触媒体と目封止ハニカム構造体との間の距離（担体間の距離）：実施例１４，１５）
担体間の距離が本発明で規定した３０ｍｍの排気ガス浄化装置（実施例１４）の場合、浄化効率が低下することが確認され、一方、担体間の距離が上記範囲内の排気ガス浄化装置（実施例１５）の場合、良好な浄化効率を示すことが確認された。すなわち、ハニカム触媒体と目封止ハニカム構造体との間の担体間の距離を上記範囲内とすることが好適である。 (Distance between honeycomb catalyst body and plugged honeycomb structure (distance between carriers): Examples 14 and 15)
In the case of the exhaust gas purifying device (Example 14) in which the distance between the carriers is 30 mm specified in the present invention, it was confirmed that the purifying efficiency is lowered, while the distance between the carriers is within the above range ( In the case of Example 15), it was confirmed that good purification efficiency was exhibited. That is, it is preferable that the distance between the carriers between the honeycomb catalyst body and the plugged honeycomb structure is within the above range.

（触媒担持量：実施例１６，１７）
目封止ハニカム構造体の触媒担持量が１２０ｇ／Ｌを超える排気ガス浄化装置（実施例１６）の場合、圧力損失が大きくなることが確認され、一方、目封止ハニカム構造体の触媒担持量が１２０ｇ／Ｌ以下の排気ガス浄化装置（実施例１７）の場合、良好な圧力損失を示すことが確認された。 (Amount of supported catalyst: Examples 16 and 17)
In the case of the exhaust gas purifying apparatus (Example 16) in which the catalyst carrying amount of the plugged honeycomb structure exceeds 120 g/L, it was confirmed that the pressure loss was large, while the catalyst carrying amount of the plugged honeycomb structure was found. It was confirmed that in the case of the exhaust gas purifying apparatus (Example 17) having a fuel consumption of 120 g/L or less, good pressure loss was exhibited.

（整流部による効果：実施例１８）
実施例６の排気ガス浄化装置の缶体の内部に、円筒状の整流部を取設した別例構成の排気ガス浄化装置（実施例１８）の場合、実施例６と比較して、ＰＭ排出個数の評価がＢからＡにアップした。すなわち、整流部の追加によってＰＭ排出個数の改善が認められるとともに、浄化率及び圧力損失に影響を及ぼすことがなく、それぞれＡの評価を維持することが認められた。そのため、総合評価として、実施例１８の排気ガス浄化装置はＡとなった。 (Effect of the rectifying section: Example 18)
In the case of an exhaust gas purifying apparatus (Example 18) having another configuration in which a cylindrical rectifying portion is installed inside the can body of the exhaust gas purifying apparatus of Example 6, PM emission is greater than that of Example 6. The evaluation of the number was increased from B to A. In other words, it was confirmed that the addition of the rectification unit improved the number of discharged PM, and maintained the evaluation of A without affecting the purification rate and the pressure loss. Therefore, as a comprehensive evaluation, the exhaust gas purifying apparatus of Example 18 was A.

上記の実施例１〜１８に示すように、浄化効率、ＰＭ排出個数、及び圧力損失の各評価項目がＡまたはＢの良好、若しくは実用上の問題のない排気ガス浄化装置を構築することが可能となる。 As shown in the above Examples 1 to 18, it is possible to construct an exhaust gas purifying apparatus in which each of the evaluation items of the purification efficiency, the number of discharged PM, and the pressure loss is A or B, or there is no practical problem. Becomes

本発明の排気ガス浄化装置は、排気ガスに含まれる粒子状物質の除去を効率的に除去することが可能であり、圧力損失を増加させることなく、エンジンの始動直後であっても高い浄化性能を発揮できるものであり、特に、直噴式ガソリンエンジンの排気ガスの浄化を行うために有益なものである。 The exhaust gas purifying apparatus of the present invention is capable of efficiently removing particulate matter contained in exhaust gas, has a high purifying performance even immediately after the engine is started, without increasing pressure loss. It is particularly useful for purifying exhaust gas of a direct injection gasoline engine.

１，６０：排気ガス浄化装置、１０：ハニカム触媒体、１１：第一流入側端面、１２：第一流出側端面、１３，２３，２３ａ，２３ｂ，２３ｃ，２３ｄ，２３ｅ，５５：セル、１４，２４：隔壁、１５：第一ハニカム基材、１６，２７：外周壁面、２０，５０：目封止ハニカム構造体、２１，５３：第二流入側端面、２２，５４：第二流出側端面、２５：第二ハニカム基材、２６，５６：目封止部、３０：缶体、３１：排気ガス流入部、３２：浄化ガス排出部、３３：流入口、３４：排出口、３５：缶体本体、３６：導入管、３７：拡径部、３８：縮径部、３９：排出管、４０：内周壁面、４１：クッション材、４２：ストッパ部材、５１：内側ハニカムセグメント、５２：外側ハニカムセグメント、６１：整流部、６２：円筒状部材、６３：孔部、Ｃ：端面中心領域、ＣＧ：浄化ガス、ＥＧ：排気ガス、Ｏ：端面外周領域、Ｄ１，Ｄ２：直径、Ｄ３：内径、Ｌ１，Ｌ２：長さ、Ｍ：領域境界線、Ｐ１：第一パターン、Ｐ２：第二パターン、Ｐ３：第三パターン、Ｐ４：第四パターン、Ｐ５：第五パターン、Ｐ６：第六パターン、Ｗ：距離。 1, 60: Exhaust gas purifying device, 10: Honeycomb catalyst body, 11: First inflow side end face, 12: First outflow side end face, 13, 23, 23a, 23b, 23c, 23d, 23e, 55: Cell, 14 , 24: partition walls, 15: first honeycomb base material, 16, 27: outer peripheral wall surface, 20, 50: plugged honeycomb structure 21, 53: second inflow side end surface, 22, 54: second outflow side end surface , 25: second honeycomb substrate, 26, 56: plugged portion, 30: can body, 31: exhaust gas inflow portion, 32: purified gas exhaust portion, 33: inflow port, 34: exhaust port, 35: can Body main body, 36: introduction pipe, 37: expanded diameter part, 38: reduced diameter part, 39: discharge pipe, 40: inner peripheral wall surface, 41: cushion material, 42: stopper member, 51: inner honeycomb segment, 52: outer side Honeycomb segment, 61: rectifying part, 62: cylindrical member, 63: hole part, C: end face center region, CG: purified gas, EG: exhaust gas, O: end face outer peripheral region, D1, D2: diameter, D3: inner diameter , L1, L2: length, M: area boundary line, P1: first pattern, P2: second pattern, P3: third pattern, P4: fourth pattern, P5: fifth pattern, P6: sixth pattern, W: distance.

Claims (12)

第一流入側端面から第一流出側端面まで延びる複数のセルを区画形成する格子状の隔壁を有する第一ハニカム基材、及び、前記第一ハニカム基材に担持された触媒を有し、前記セルの両端がそれぞれ開口してなるハニカム触媒体と、
第二流入側端面から第二流出側端面まで延びる複数のセルを区画形成する格子状の隔壁を有する第二ハニカム基材、及び、前記第二流入側端面及び／または前記第二流出側端面における前記セルの開口部を予め規定された配設基準に従って目封止して配設された複数の目封止部を有する目封止ハニカム構造体と、
前記ハニカム触媒体及び前記ハニカム触媒体の下流の位置に前記目封止ハニカム構造体をそれぞれ収容可能に形成され、前記ハニカム触媒体の前記第一流入側端面と相対する位置に流入口が設けられ、浄化対象の排気ガスが流入する排気ガス流入部及び前記目封止ハニカム構造体の前記第二流出側端面と相対する位置に排出口が設けられ、浄化後の浄化ガスを排出する浄化ガス排出部を有する缶体と
を備え、
前記目封止ハニカム構造体は、
前記第二流入側端面及び前記第二流出側端面の少なくともいずれか一方の端面中心領域における圧力損失が、前記端面中心領域の周囲に位置する端面外周領域の圧力損失と比べて大きくなるように、
前記端面中心領域は、前記第二流入側端面及び前記第二流出側端面において、いずれも前記目封止部が配設されているのに対し、
前記端面外周領域は、前記第二流入側端面にのみに前記目封止部が配設され、
前記圧力損失差に起因して、前記排気ガスを前記端面外周領域側に誘導する排気ガス浄化装置。 A first honeycomb base material having a lattice-shaped partition wall that partitions and forms a plurality of cells extending from the first inflow side end surface to the first outflow side end surface, and a catalyst supported on the first honeycomb base material, A honeycomb catalyst body in which both ends of the cell are open,
In the second honeycomb base material having a lattice-shaped partition wall partitioning and forming a plurality of cells extending from the second inflow side end surface to the second outflow side end surface, and in the second inflow side end surface and / or the second outflow side end surface A plugged honeycomb structure having a plurality of plugging portions provided by plugging the openings of the cells according to a predetermined placement standard,
The honeycomb catalyst body and the plugged honeycomb structure are respectively formed at positions downstream of the honeycomb catalyst body so as to be able to be housed therein, and an inlet is provided at a position facing the first inflow side end surface of the honeycomb catalyst body. , A purified gas discharge for discharging the purified gas after purification, in which an exhaust port is provided at a position facing the exhaust gas inflow part into which the exhaust gas to be purified flows and the second outflow side end surface of the plugged honeycomb structure A can body having a part,
The plugged honeycomb structure is
The pressure loss in the end face center region of at least one of the second inflow side end face and the second outflow side end face is larger than the pressure loss of the end face outer peripheral region located around the end face center region,
The end face center region, in the second inflow side end face and the second outflow side end face, while the plugging portion is arranged,
The end surface outer peripheral region, the plugging portion is disposed only on the second inflow side end surface,
An exhaust gas purification device that guides the exhaust gas toward the outer peripheral region of the end surface due to the pressure loss difference . 前記端面中心領域は、
前記流入口を前記第二流入側端面に垂直に投影した領域を含み、
前記端面中心領域の中心領域面積は、
前記第二流入側端面と前記ハニカム触媒体を挟んで対向する前記排気ガス流入部の前記流入口の流入口断面積と同一または前記流入口断面積より大きく設定されている請求項１に記載の排気ガス浄化装置。 The end face center region is
A region in which the inflow port is projected perpendicularly to the second inflow side end face,
The central region area of the end face central region,
The inlet cross-sectional area of the inlet of the exhaust gas inlet facing the second inlet-side end face with the honeycomb catalyst body interposed therebetween is set to be equal to or larger than the inlet cross-sectional area. Exhaust gas purification device. 前記端面中心領域の前記セルの開口率と前記端面外周領域の前記セルの開口率が異なる請求項１または２に記載の排気ガス浄化装置。 The exhaust gas purifying apparatus according to claim 1 or 2, wherein an aperture ratio of the cells in the end face central region is different from an aperture ratio of the cells in the end face outer peripheral region. 前記目封止ハニカム構造体は、
１または複数の角柱状の内側ハニカムセグメントと、
前記内側ハニカムセグメントを取り囲む複数の角柱状の外側ハニカムセグメントと
を備え、
前記内側ハニカムセグメントにおける前記第二流入側端面及び／または前記第二流出側端面は、前記端面中心領域に相当し、
前記外側ハニカムセグメントにおける前記第二流入側端面及び／または前記第二流出側端面は、前記端面外周領域に該当する請求項１〜３のいずれか一項に記載の排気ガス浄化装置。 The plugged honeycomb structure is
One or more prismatic inner honeycomb segments,
With a plurality of prismatic outer honeycomb segments surrounding the inner honeycomb segment,
The second inflow side end surface and / or the second outflow side end surface in the inner honeycomb segment corresponds to the end surface center region,
The exhaust gas purification apparatus according to any one of claims 1 to 3, wherein the second inflow side end surface and/or the second outflow side end surface of the outer honeycomb segment correspond to the end surface outer peripheral region. 前記目封止部の前記配設基準は、
前記第二流入側端面及び／または前記第二流出側端面における前記セルをそれぞれ一つおきに交互に目封止し、格子状に前記目封止部を配設した構造、及び、前記第二流入側端面における前記セルの断面積と、前記第二流出側端面における前記セルの断面積とがそれぞれ異なるように前記目封止部を配設した構造の少なくともいずれか一方である請求項１〜４のいずれか一項に記載の排気ガス浄化装置。 The arrangement standard of the plugged portion is
A structure in which every other one of the cells on the second inflow side end surface and/or the second outflow side end surface is alternately plugged, and the plugged portions are arranged in a grid pattern, and the second The cross-sectional area of the cell at the inflow side end surface, and the cross-sectional area of the cell at the second outflow-side end surface is at least one of the structure in which the plugging portion is arranged so as to be different from each other. The exhaust gas purification device according to any one of 4 above. 前記第一ハニカム基材の隔壁の気孔率は、
前記第二ハニカム基材の隔壁の気孔率より小さく設定されている請求項１〜５のいずれか一項に記載の排気ガス浄化装置。 The porosity of the partition walls of the first honeycomb substrate is
The exhaust gas purifying apparatus according to any one of claims 1 to 5, wherein the exhaust gas purifying apparatus is set to have a porosity smaller than that of partition walls of the second honeycomb substrate. 前記目封止ハニカム構造体の中心軸方向の長さに対する前記ハニカム触媒体の中心軸方向の長さの比の値が、０．１〜０．５である請求項１〜６のいずれか一項に記載の排気ガス浄化装置。 7. The value of the ratio of the length in the central axis direction of the honeycomb catalyst body to the length in the central axis direction of the plugged honeycomb structure is 0.1 to 0.5. The exhaust gas purification device according to the item. 前記ハニカム触媒体の直径に対する前記ハニカム触媒体の中心軸方向の長さの比の値が、０．１〜０．６である請求項１〜７のいずれか一項に記載の排気ガス浄化装置。 The exhaust gas purifying apparatus according to any one of claims 1 to 7, wherein a value of a ratio of a length of the honeycomb catalyst body in a central axis direction to a diameter of the honeycomb catalyst body is 0.1 to 0.6. . 前記目封止ハニカム構造体は、
前記第二ハニカム基材に担持された触媒を有し、
前記ハニカム触媒体の前記第一ハニカム基材に担持される前記触媒の単位体積当たりの担持量が、２００〜４００ｇ／Ｌであり、
前記目封止ハニカム構造体の前記第二ハニカム基材に担持される前記触媒の単位体積当たりの担持量が、１０〜１２０ｇ／Ｌである請求項１〜８のいずれか一項に記載の排気ガス浄化装置。 The plugged honeycomb structure is
Having a catalyst supported on the second honeycomb substrate,
The amount of the catalyst supported on the first honeycomb substrate of the honeycomb catalyst body per unit volume is 200 to 400 g/L,
The exhaust gas according to any one of claims 1 to 8, wherein an amount of the catalyst carried on the second honeycomb base material of the plugged honeycomb structure per unit volume is 10 to 120 g/L. Gas purification device. 前記第一ハニカム基材の隔壁厚さが、５０．８〜１０１．６μｍの範囲である請求項１〜９のいずれか一項に記載の排気ガス浄化装置。 The exhaust gas purifying apparatus according to claim 1, wherein the partition wall thickness of the first honeycomb substrate is in the range of 50.8 to 101.6 μm. 前記ハニカム触媒体と前記目封止ハニカム構造体との間の距離が、１〜２０ｍｍである請求項１〜１０のいずれか一項に記載の排気ガス浄化装置。 The exhaust gas purification device according to any one of claims 1 to 10, wherein a distance between the honeycomb catalyst body and the plugged honeycomb structure is 1 to 20 mm. 前記缶体の前記排気ガス流入部及び前記ハニカム触媒体の前記第一流入側端面の間に設けられ、外周壁に複数の孔部が穿設された円筒状の整流部を更に備え、
前記流入口に対向する前記整流部の一端から取り込まれた前記排気ガスの前記ハニカム触媒体及び前記目封止ハニカム構造体の軸方向に直交する方向への流れを調整する請求項１〜１１のいずれか一項に記載の排気ガス浄化装置。 Further provided is a cylindrical rectifying portion provided between the exhaust gas inflow portion of the can body and the first inflow side end surface of the honeycomb catalyst body and having a plurality of holes formed in the outer peripheral wall,
The flow rate of the exhaust gas taken in from one end of the rectifying section facing the inflow port in a direction orthogonal to the axial direction of the honeycomb catalyst body and the plugged honeycomb structure is adjusted. The exhaust gas purification device according to any one of claims.
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