JP2002309922A - Exhaust emission purifier - Google Patents
Exhaust emission purifierInfo
- Publication number
- JP2002309922A JP2002309922A JP2001116478A JP2001116478A JP2002309922A JP 2002309922 A JP2002309922 A JP 2002309922A JP 2001116478 A JP2001116478 A JP 2001116478A JP 2001116478 A JP2001116478 A JP 2001116478A JP 2002309922 A JP2002309922 A JP 2002309922A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- exhaust gas
- side cell
- plugging
- dpf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/30—Honeycomb supports characterised by their structural details
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排気ガス中に含ま
れる微粒子物質（Particulate Matter；以下、『ＰＭ』
と記す）を捕集する排気浄化装置に関するものである。The present invention relates to a particulate matter (Particulate Matter; hereinafter, referred to as "PM") contained in exhaust gas.
The present invention relates to an exhaust gas purifying apparatus for collecting exhaust gas.
【０００２】[0002]
【従来の技術】従来、コージェライト（２ＭｇＯ・２Ａ
ｌ2 Ｏ3 ・５ＳｉＯ2 ）という多孔質セラミックスを用
い、排気ガス中に含まれるＰＭを一旦捕集し、こののち
ヒータ再生や触媒反応等によって堆積したＰＭを浄化さ
せ回復を図る排気浄化装置が知られている。この具体的
なものとしては、多孔質薄壁を有するウォールフロータ
イプのフィルタ構造からなり、ディーゼル機関の排気通
路に装着されたディーゼル・パティキュレート・フィル
タ(Diesel Particulate Filter；以下、単に『ＤＰＦ』
と記す）に応用したものがある。2. Description of the Related Art Conventionally, cordierite (2MgO.2A)
An exhaust gas purifying apparatus that uses a porous ceramic (l 2 O 3 .5SiO 2 ) to once collect PM contained in exhaust gas and then purify and recover PM deposited by heater regeneration or catalytic reaction. Are known. As a specific example thereof, a diesel particulate filter (Diesel Particulate Filter; hereinafter simply referred to as “DPF”) having a wall flow type filter structure having a porous thin wall and being mounted in an exhaust passage of a diesel engine.
).
【０００３】[0003]
【発明が解決しようとする課題】ところで、現状のＤＰ
Ｆにおいては、排気ガス中に過剰なＰＭが排出されたと
きには、ＤＰＦの排気ガスの流れ方向の最前面側にＰＭ
が堆積し易いという現象がある。このため、ＤＰＦの排
気ガスの流れ方向のセルと称する格子状の壁にて囲まれ
た通路の最前面側における通路面積が、ＰＭの堆積によ
って絞られると圧損（圧力損失）が急激に増加し、ＤＰ
Ｆの上流側に接続されたディーゼル機関等では機関出力
の低下を招くという不具合があった。The present DP
In F, when excessive PM is exhausted into the exhaust gas, the PM is moved to the forefront side in the flow direction of the exhaust gas of the DPF.
There is a phenomenon that is easily deposited. For this reason, when the passage area on the forefront side of the passage surrounded by a lattice-shaped wall called a cell in the flow direction of the exhaust gas of the DPF is narrowed by the deposition of PM, pressure loss (pressure loss) rapidly increases. , DP
In the case of a diesel engine or the like connected upstream of F, there was a problem that the engine output was reduced.
【０００４】そこで、この発明はかかる不具合を解決す
るためになされたもので、排気ガス中に含まれるＰＭが
流れ方向の最前面側に堆積し難く、また、堆積しても最
前面側の通路面積が絞られることのない排気浄化装置の
提供を課題としている。Accordingly, the present invention has been made to solve such a problem, and it is difficult for PM contained in exhaust gas to accumulate on the forefront side in the flow direction. It is an object of the present invention to provide an exhaust gas purification device whose area is not narrowed.
【０００５】[0005]
【課題を解決するための手段】請求項１の排気浄化装置
によれば、ガス流入側セル（通路）の周囲のガス流出側
セルの先端側を栓詰する栓詰部には、ガス流出側セルの
端面より上流側に向かって細くなる形状にて突出する突
出部位が形成されている。これにより、栓詰部の突出部
位にＰＭ（微粒子物質）が堆積したとしても、その下流
側のガス流入側セルの通路面積より狭くなり難いため、
ＰＭの堆積による圧損の急激な増加が防止される。ま
た、排気ガスがガス流入側セル内にスムースに流入され
易くなるため、ガス流入側セル２２の最前面側にＰＭが
堆積する傾向が是正される。According to the exhaust gas purifying apparatus of the first aspect, the plugging portion for plugging the tip side of the gas outflow side cell around the gas inflow side cell (passage) has the gas outflow side. A protruding portion is formed to protrude in a shape narrowing toward the upstream side from the end face of the cell. As a result, even if PM (particulate matter) accumulates at the projecting portion of the plugging portion, it is difficult for the PM to become smaller than the passage area of the gas inflow side cell on the downstream side.
A sudden increase in pressure loss due to the deposition of PM is prevented. In addition, since the exhaust gas easily flows into the gas inflow side cell smoothly, the tendency of PM to accumulate on the forefront side of the gas inflow side cell 22 is corrected.
【０００６】請求項２の排気浄化装置では、突出部位が
複数の異なる突出長さにて形成されており、その先端距
離が広げられるため整流効果が増大され、ガス流入側セ
ルの最前面側近傍へのＰＭの堆積をより少なくできると
いう効果が得られる。In the exhaust gas purifying apparatus according to the second aspect, the protruding portions are formed with a plurality of different protruding lengths, and the distance between the protruding portions is widened, so that the rectifying effect is increased, and the vicinity of the frontmost side of the gas inflow side cell is improved. This has the effect of reducing the deposition of PM on the surface.
【０００７】請求項３の排気浄化装置では、壁及び突出
部位に酸化触媒が担持されており、その触媒反応を利用
して堆積したＰＭが良好に浄化され回復が図られる。In the exhaust gas purifying apparatus of the third aspect, the oxidation catalyst is carried on the wall and the projecting portion, and the deposited PM is satisfactorily purified and recovered by utilizing the catalytic reaction.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態を実施
例に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples.
【０００９】図１は本発明の実施の形態の一実施例にか
かる排気浄化装置が適用された触媒付ＤＰＦ(Diesel Pa
rticulate Filter）のディーゼル機関への装着を示す概
略構成図である。FIG. 1 shows a DPF (Diesel Pa) equipped with a catalyst to which an exhaust gas purifying apparatus according to an embodiment of the present invention is applied.
FIG. 2 is a schematic configuration diagram illustrating attachment of a rticulate filter to a diesel engine.
【００１０】図１において、１０はディーゼル機関であ
り、上流側のエアクリーナ（図示略）から吸入された空
気は吸気通路１１を通過し、ディーゼル機関１０の各気
筒に対応するインジェクタ（図示略）から噴射された燃
料と混合圧縮され所定タイミングで燃焼される。そし
て、燃焼後の排気ガスは排気通路１２途中に容器内に収
容され装着されたＤＰＦ２０を通過したのち大気中に排
出される。In FIG. 1, reference numeral 10 denotes a diesel engine, and air sucked from an upstream air cleaner (not shown) passes through an intake passage 11 from an injector (not shown) corresponding to each cylinder of the diesel engine 10. The fuel is mixed and compressed with the injected fuel and burned at a predetermined timing. Then, the exhaust gas after combustion passes through the DPF 20 housed and mounted in a container in the middle of the exhaust passage 12, and is then discharged into the atmosphere.
【００１１】次に、ＤＰＦ２０の構造について、図２及
び図３を参照して説明する。ここで、図２はＤＰＦ２０
を排気ガス流入側から見た外観を示す斜視図、図３は図
２のＤＰＦ２０の排気ガスの流れ方向に沿う拡大断面図
である。Next, the structure of the DPF 20 will be described with reference to FIGS. Here, FIG.
FIG. 3 is a perspective view showing the appearance as viewed from the exhaust gas inflow side, and FIG. 3 is an enlarged sectional view of the DPF 20 in FIG. 2 along the flow direction of the exhaust gas.
【００１２】図２及び図３に示すように、ＤＰＦ２０は
所謂、モノリス触媒コンバータであり、触媒作用のある
活性成分が担持された多孔質セラミックスとしてのコー
ジェライト（Cordierite）を担体とする一体構造にて略
円柱状に形成されている。As shown in FIGS. 2 and 3, the DPF 20 is a so-called monolithic catalytic converter, and has an integral structure using a cordierite as a porous ceramic carrying a catalytically active component as a carrier. It is formed in a substantially columnar shape.
【００１３】このＤＰＦ２０は、排気ガスの流れ方向に
格子状の多孔質薄壁（以下、単に『壁』と記す）２１
と、これら壁２１にて囲まれた複数のガス流入側セル
（通路）２２及びガス流出側セル２３と、ガス流入側セ
ル２２の後端を目封じする栓詰部２４及びガス流出側セ
ル２３の先端を目封じする栓詰部２５とを有するウォー
ルフロータイプのフィルタ構造からなる。The DPF 20 has a lattice-like porous thin wall (hereinafter simply referred to as a “wall”) 21 in the flow direction of the exhaust gas.
And a plurality of gas inflow-side cells (passages) 22 and gas outflow-side cells 23 surrounded by the walls 21, and a plugging portion 24 and a gas outflow-side cell 23 for sealing the rear end of the gas inflow-side cells 22. And a plugging portion 25 for plugging the end of the filter.
【００１４】ここで、ＤＰＦ２０のガス流入側セル２２
の後端を目封じする栓詰部２４は、単に、ガス流出を阻
止するためのものである。これに対して、ＤＰＦ２０の
ガス流出側セル２３の先端を目封じしてガス流入を阻止
する栓詰部２５には、更に、突出部位２５ａが形成され
ている。この突出部位２５ａは、ガス流出側セル２３の
端面より上流側に向かって栓詰部２５よりも細くなる形
状にて突出されている。Here, the gas inlet side cell 22 of the DPF 20
The plugging portion 24 for plugging the rear end is simply for preventing gas outflow. On the other hand, a projecting portion 25a is further formed in the plugging portion 25 that plugs the tip of the gas outflow side cell 23 of the DPF 20 to prevent gas inflow. The protruding portion 25a protrudes in a shape narrower than the plugging portion 25 toward the upstream side from the end face of the gas outflow side cell 23.
【００１５】これにより、ＤＰＦ２０のガス流入側セル
２２の壁２１の幅Ｗに対して、突出部位２５ａの先端部
分の幅が約２Ｗとなり、開口面積を広げたのと同様にな
る。したがって、喩え、栓詰部２５の突出部位２５ａに
ＰＭが堆積したとしても、その下流側のガス流入側セル
２２の通路面積より狭くなり難くできる。このため、Ｄ
ＰＦ２０のＰＭの堆積による圧損が急激に増加すること
を防止することができる。As a result, the width of the tip of the protruding portion 25a is about 2 W with respect to the width W of the wall 21 of the gas inflow-side cell 22 of the DPF 20, which is the same as the opening area. Therefore, even if PM accumulates at the protruding portion 25a of the plugging portion 25, it can be hardly made smaller than the passage area of the gas inflow side cell 22 on the downstream side. Therefore, D
It is possible to prevent a sudden increase in pressure loss due to the deposition of PM in the PF 20.
【００１６】また、上述の構造により、栓詰部２５の突
出部位２５ａからガス流入側セル２２の最前面側（入口
側）近傍へのＰＭの堆積を少なくする排気ガスの流れの
整流効果も期待できる。つまり、排気ガスのガス流入側
セル２２への流入の際、ガス流出側セル２３の先端を平
坦に目封じした場合に比べ、ガス流入側セル２２の最前
面側近傍での澱みをなくす効果がある。したがって、デ
ィーゼル機関より過剰なＰＭが排出されたときにも、排
気ガスはガス流入側セル２２内にスムースに流入され易
くなる。このため、ガス流出側セル２３の栓詰部２５の
近傍、即ち、ガス流入側セル２２の最前面側にＰＭが堆
積する傾向を是正することができる。Further, with the above-described structure, a rectifying effect of the flow of exhaust gas which reduces the accumulation of PM from the projecting portion 25a of the plugging portion 25 to the vicinity of the frontmost side (inlet side) of the gas inflow side cell 22 is expected. it can. That is, when the exhaust gas flows into the gas inflow side cell 22, the effect of eliminating the stagnation near the frontmost side of the gas inflow side cell 22 is smaller than when the tip of the gas outflow side cell 23 is plugged flat. is there. Therefore, even when excessive PM is exhausted from the diesel engine, the exhaust gas can easily flow into the gas inflow side cell 22 smoothly. For this reason, the tendency of PM to accumulate near the plugging portion 25 of the gas outflow side cell 23, that is, in the forefront side of the gas inflow side cell 22 can be corrected.
【００１７】このように、本実施例の排気浄化装置は、
多孔質セラミックスを用いたＤＰＦ（ディーゼル・パテ
ィキュレート・フィルタ）２０であって、排気ガスの流
れ方向に格子状の壁２１にて囲まれ、後端側及び先端側
を交互に栓詰部２４，２５にて栓詰しガス流入側及びガ
ス流出側とする複数のガス流入側セル（通路）２２及び
ガス流出側セル２３を有し、ガス流出側セル２３の先端
側を栓詰する栓詰部２５は、ガス流出側セル２３の端面
より上流側に向かって細くなる形状にて突出する突出部
位２５ａを形成するものである。また、ＤＰＦ２０の壁
２１及び突出部位２５ａが酸化触媒を担持するものであ
る。As described above, the exhaust gas purifying apparatus of this embodiment is
A DPF (Diesel Particulate Filter) 20 using porous ceramics, which is surrounded by a lattice-shaped wall 21 in the flow direction of exhaust gas, and has a plugging part 24, A plugging section that has a plurality of gas inflow-side cells (passages) 22 and gas outflow-side cells 23 that are plugged at 25 to serve as a gas inflow side and a gas outflow side. Numeral 25 forms a protruding portion 25a that protrudes in a shape narrowing toward the upstream side from the end face of the gas outflow side cell 23. Further, the wall 21 and the protruding portion 25a of the DPF 20 carry an oxidation catalyst.
【００１８】つまり、ガス流入側セル２２の周囲のガス
流出側セル２３の先端側を栓詰する栓詰部２５には、ガ
ス流出側セル２３の端面より上流側に向かって細くなる
形状にて突出する突出部位２５ａが形成されている。こ
れにより、栓詰部２５の突出部位２５ａにＰＭが堆積し
たとしても、その下流側のガス流入側セル２２の通路面
積より狭くなり難いため、ＤＰＦ２０のＰＭの堆積によ
る圧損の急激な増加を防止することができる。また、栓
詰部２５の突出部位２５ａによる整流作用により排気ガ
スがガス流入側セル２２内にスムースに流入され易くな
るため、ガス流入側セル２２の最前面側にＰＭが堆積す
る傾向を是正することができる。そして、ＤＰＦ２０は
壁２１及び突出部位２５ａに担持された酸化触媒の触媒
反応を利用して、堆積したＰＭが良好に浄化され回復が
図られることとなる。That is, the plugging portion 25 for plugging the front end side of the gas outflow side cell 23 around the gas inflow side cell 22 has a shape that becomes thinner toward the upstream side from the end face of the gas outflow side cell 23. A projecting portion 25a that projects is formed. As a result, even if PM accumulates at the protruding portion 25a of the plugging portion 25, it is difficult for the PM to become smaller than the passage area of the gas inflow side cell 22 on the downstream side, so that a rapid increase in pressure loss due to accumulation of PM in the DPF 20 is prevented. can do. In addition, the rectifying action of the projecting portion 25a of the plugging portion 25 makes it easier for the exhaust gas to smoothly flow into the gas inflow-side cell 22, so that the tendency of PM to accumulate on the frontmost side of the gas inflow-side cell 22 is corrected. be able to. Then, the DPF 20 utilizes the catalytic reaction of the oxidation catalyst carried on the wall 21 and the protruding portion 25a, so that the deposited PM is satisfactorily purified and recovery is achieved.
【００１９】次に、図３の栓詰部２５の突出部位２５ａ
の変形例について、図４のＤＰＦ２０′を参照して説明
する。なお、図中、上述の実施例と同様の構成または相
当部分からなるものについては同一符号及び同一記号を
付し、その詳細な説明を省略する。Next, the projecting portion 25a of the plugging portion 25 shown in FIG.
Will be described with reference to the DPF 20 'in FIG. In the drawings, the same reference numerals and symbols are given to components having the same configuration or corresponding portions as those in the above-described embodiment, and detailed description thereof will be omitted.
【００２０】図３に示すＤＰＦ２０のガス流出側セル２
３の先端側の栓詰部２５の突出部位２５ａでは、ガス流
出側セル２３の端面から上流側への突出長さが同じ寸法
にて形成されている。これに対して、図４に示すＤＰＦ
２０′では、ガス流出側セル２３の端面から上流側への
突出長さがＸ，Ｙと異なる突出部位２６ａ，２７ａを形
成した栓詰部２６，２７にてガス流出側セル２３の先端
側が目封じされている。The gas outlet cell 2 of the DPF 20 shown in FIG.
In the protruding portion 25a of the plugging portion 25 on the distal end side of No. 3, the protruding length from the end face of the gas outflow side cell 23 to the upstream side is formed with the same dimension. On the other hand, the DPF shown in FIG.
In 20 ', the distal end side of the gas outflow side cell 23 at the plugging portions 26, 27 which form the protruding portions 26a, 27a whose projection lengths from the end face of the gas outflow side cell 23 to the upstream side are different from X and Y are formed. It is sealed.
【００２１】これにより、図４に示すＤＰＦ２０′で
は、ガス流出側セル２３の栓詰部２６の突出部位２６ａ
と隣接する栓詰部２７の突出部位２７ａとの先端間の距
離を、図３に示すＤＰＦ２０より広げることができる。
このため、ＤＰＦ２０′のガス流入側セル２２の最前面
側へのＰＭの堆積による圧損が急激に増加することを防
止することができる。また、ＤＰＦ２０′では、栓詰部
２６，２７の突出部位２６ａ，２７ａからガス流入側セ
ル２２の最前面側近傍へのＰＭの堆積を少なくする排気
ガスの流れの整流効果が増大され、ガス流出側セル２３
の栓詰部２６，２７近傍にＰＭが堆積する傾向を是正す
ることができる。As a result, in the DPF 20 'shown in FIG.
The distance between the tip of the plugging portion 27 and the adjacent protruding portion 27a can be wider than that of the DPF 20 shown in FIG.
For this reason, it is possible to prevent a sudden increase in pressure loss due to deposition of PM on the forefront side of the gas inflow side cell 22 of the DPF 20 '. Further, in the DPF 20 ', the rectifying effect of the flow of the exhaust gas for reducing the deposition of PM from the projecting portions 26a, 27a of the plugging portions 26, 27 to the vicinity of the frontmost side of the gas inflow side cell 22 is increased, and the gas outflow. Side cell 23
The tendency of PM to accumulate in the vicinity of the plugging portions 26 and 27 can be corrected.
【００２２】このように、本変形例の排気浄化装置は、
多孔質セラミックスを用いたＤＰＦ２０′であって、排
気ガスの流れ方向に格子状の壁２１にて囲まれ、後端側
及び先端側を交互に栓詰部２４，２６，２７にて栓詰し
ガス流入側及びガス流出側とする複数のガス流入側セル
（通路）２２及びガス流出側セル２３を有し、ガス流出
側セル２３の先端側を栓詰する栓詰部２６，２７は、ガ
ス流出側セル２３の端面より上流側に向かって細くなる
形状にて突出する突出部位２６ａ，２７ａを形成するも
のである。また、これら突出部位２６ａ，２７ａを２つ
（複数）の異なる突出長さＸ，Ｙにて形成するものであ
る。そして、ＤＰＦ２０′の壁２１及び突出部位２６
ａ，２７ａが酸化触媒を担持するものである。As described above, the exhaust gas purifying apparatus of the present modification example
A DPF 20 'using porous ceramics, which is surrounded by a lattice-shaped wall 21 in the flow direction of exhaust gas, and whose rear end and front end are alternately plugged with plugging portions 24, 26, 27. It has a plurality of gas inflow side cells (passages) 22 and a gas outflow side cell 23 which are a gas inflow side and a gas outflow side. The projecting portions 26a and 27a are formed so as to project in a shape narrowing toward the upstream side from the end face of the outflow side cell 23. The projecting portions 26a and 27a are formed with two (plural) different projecting lengths X and Y. Then, the wall 21 and the projecting portion 26 of the DPF 20 ′
a and 27a carry an oxidation catalyst.
【００２３】つまり、ガス流入側セル２２の周囲のガス
流出側セル２３の先端側を栓詰する栓詰部２６，２７に
は、ガス流出側セル２３の端面より上流側に向かって細
くなる形状にて突出する突出部位２６ａ，２７ａが形成
されている。これにより、栓詰部２６，２７の突出部位
２６ａ，２７ａにＰＭが堆積したとしても、その下流側
のガス流入側セル２２の通路面積より狭くなり難いた
め、ＤＰＦ２０′のＰＭの堆積による圧損の急激な増加
を防止することができる。また、栓詰部２６，２７の突
出部位２６ａ，２７ａによる整流作用により排気ガスが
ガス流入側セル２２内にスムースに流入され易くなるた
め、ガス流入側セル２２の最前面側にＰＭが堆積する傾
向を是正することができる。そして、栓詰部２６，２７
の突出部位２６ａ，２７ａでは先端距離が広げられてい
るため整流効果が増大され、ガス流入側セル２２の最前
面側近傍へのＰＭの堆積をより少なくすることができ
る。更に、ＤＰＦ２０′は壁２１及び突出部位２５ａに
担持された酸化触媒の触媒反応を利用して、堆積したＰ
Ｍが良好に浄化され回復が図られることとなる。That is, the plugging portions 26 and 27 for plugging the distal end side of the gas outflow side cell 23 around the gas inflow side cell 22 have a shape that becomes thinner toward the upstream side from the end face of the gas outflow side cell 23. Projecting portions 26a and 27a are formed. As a result, even if PM accumulates at the projecting portions 26a, 27a of the plugging portions 26, 27, it is difficult for the PM to become smaller than the passage area of the gas inflow-side cell 22 on the downstream side. A sharp increase can be prevented. Further, the rectifying action of the projecting portions 26a, 27a of the plugging portions 26, 27 facilitates the smooth flow of the exhaust gas into the gas inflow side cell 22, so that PM is deposited on the frontmost side of the gas inflow side cell 22. Can correct trends. And the plugging portions 26 and 27
In the projecting portions 26a, 27a, the rectifying effect is increased because the tip distance is widened, and the deposition of PM in the vicinity of the frontmost side of the gas inflow side cell 22 can be further reduced. Further, the DPF 20 'utilizes the catalytic reaction of the oxidation catalyst carried on the wall 21 and the protruding portion 25a to deposit the deposited PPF.
M is satisfactorily purified and recovery is achieved.
【００２４】ところで、上記実施例及び変形例では、栓
詰部２５，２６，２７の突出部位２５ａ，２６ａ，２７
ａの先端が尖って形成されているが、本発明を実施する
場合には、これに限定されるものではなく、突出部位２
５ａ，２６ａ，２７ａの先端がガス流出セル２３部分よ
りも細ければよく、丸みを有する先端形状であってもよ
い。また、栓詰部２５，２６，２７の突出部位２５ａ，
２６ａ，２７ａでは、ガス流出側セル２３の格子状の壁
２１に合わせ四角錐形状にて形成されているが、先端側
を円錐状等に形成することもできる。By the way, in the above embodiment and the modified example, the projecting portions 25a, 26a, 27 of the plugging portions 25, 26, 27 are provided.
a is formed to be sharp, but in the case of carrying out the present invention, the present invention is not limited to this.
It is sufficient that the tips of 5a, 26a, and 27a are thinner than the gas outflow cell 23, and may have a rounded tip shape. Also, the projecting portions 25a of the plugging portions 25, 26, 27,
In 26a and 27a, although it is formed in the shape of a quadrangular pyramid according to the lattice-shaped wall 21 of the gas outflow side cell 23, the tip side may be formed in a conical shape or the like.
【００２５】そして、上記実施例及び変形例では、ガス
流出側セル２３の栓詰部２５，２６，２７の全てに対し
て突出部位２５ａ，２６ａ，２７ａが形成されている
が、本発明を実施する場合には、これに限定されるもの
ではなく、１つ飛びや選択的に適宜、形成することによ
っても、その効果を得ることができる。また、突出部位
２５ａ，２６ａ，２７ａの突出形状を必ずしも鋭角的に
する必要もない。In the above embodiment and the modified example, the projecting portions 25a, 26a, 27a are formed for all the plugging portions 25, 26, 27 of the gas outlet cell 23. However, the present invention is implemented. In this case, the present invention is not limited to this, and the effect can be obtained by skipping one step or selectively forming it appropriately. Further, it is not always necessary to make the projecting shape of the projecting portions 25a, 26a, 27a acute.
【図１】 図１は本発明の実施の形態の一実施例にかか
る排気浄化装置及びその製造方法が適用された触媒付Ｄ
ＰＦのディーゼル機関への装着を示す概略構成図であ
る。FIG. 1 is an exhaust gas purifying apparatus according to one embodiment of the present invention and a catalyst-equipped D to which the manufacturing method thereof is applied.
It is a schematic structure figure showing attachment of a PF to a diesel engine.
【図２】 図２は図１のＤＰＦの外観を示す斜視図であ
る。FIG. 2 is a perspective view showing the appearance of the DPF of FIG. 1;
【図３】 図３は図２のＤＰＦの排気ガスの流れ方向に
沿う断面図である。FIG. 3 is a cross-sectional view of the DPF of FIG. 2 taken along a flow direction of exhaust gas.
【図４】 図４は図３のＤＰＦの栓詰部における突出部
位の変形例を示す断面図である。FIG. 4 is a cross-sectional view showing a modified example of a protruding portion in a plugging portion of the DPF of FIG.
２０ （触媒付）ＤＰＦ（排気浄化装置） ２１ 壁 ２２ ガス流入側セル ２３ ガス流出側セル ２４，２５ 栓詰部 ２５ａ 突出部位 Reference Signs List 20 (with catalyst) DPF (exhaust gas purifier) 21 Wall 22 Gas inflow side cell 23 Gas outflow side cell 24, 25 Plugging part 25a Projecting part
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3G090 AA02 AA03 BA01 EA01 4D048 AA14 AB01 BB02 CC12 CD05 4D058 JA32 JA37 JB06 MA44 QA01 QA17 SA08 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3G090 AA02 AA03 BA01 EA01 4D048 AA14 AB01 BB02 CC12 CD05 4D058 JA32 JA37 JB06 MA44 QA01 QA17 SA08
Claims (3)
置において、 排気ガスの流れ方向に格子状の壁にて囲まれ、後端側及
び先端側を交互に栓詰しガス流入側及びガス流出側とす
る複数の通路を有し、 前記ガス流出側の通路の先端側を栓詰する栓詰部は、前
記ガス流出側の通路の端面より上流側に向かって細くな
る形状にて突出する突出部位を形成することを特徴とす
る排気浄化装置。1. An exhaust gas purifying apparatus using porous ceramics, wherein said gas purifying apparatus is surrounded by a lattice-shaped wall in a flow direction of exhaust gas, and a rear end side and a front end side are alternately plugged and a gas inflow side and a gas outflow side. A plugging portion for plugging a distal end side of the gas outflow side passage, wherein the plugging portion protrudes in a shape narrowing toward an upstream side from an end surface of the gas outflow side passage. An exhaust gas purification apparatus characterized by forming:
にて形成することを特徴とする請求項１に記載の排気浄
化装置。2. The exhaust gas purifying apparatus according to claim 1, wherein the projecting portions are formed with a plurality of different projecting lengths.
担持することを特徴とする請求項１または請求項２に記
載の排気浄化装置。3. The exhaust gas purification apparatus according to claim 1, wherein the wall and the projecting portion carry an oxidation catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001116478A JP2002309922A (en) | 2001-04-16 | 2001-04-16 | Exhaust emission purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001116478A JP2002309922A (en) | 2001-04-16 | 2001-04-16 | Exhaust emission purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002309922A true JP2002309922A (en) | 2002-10-23 |
Family
ID=18967208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001116478A Withdrawn JP2002309922A (en) | 2001-04-16 | 2001-04-16 | Exhaust emission purifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002309922A (en) |
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