JPH0631133Y2 - Exhaust gas purification filter - Google Patents
Exhaust gas purification filterInfo
- Publication number
- JPH0631133Y2 JPH0631133Y2 JP14106588U JP14106588U JPH0631133Y2 JP H0631133 Y2 JPH0631133 Y2 JP H0631133Y2 JP 14106588 U JP14106588 U JP 14106588U JP 14106588 U JP14106588 U JP 14106588U JP H0631133 Y2 JPH0631133 Y2 JP H0631133Y2
- Authority
- JP
- Japan
- Prior art keywords
- filter body
- exhaust gas
- inlet side
- central portion
- passages
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
Landscapes
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 本考案は内燃機関における排気ガス中のカーボン等の未
燃焼物（パティキュレート）を除去するための排気ガス
浄化用フイルタの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an exhaust gas purifying filter for removing unburned substances (particulates) such as carbon in exhaust gas in an internal combustion engine. .
〈従来の技術〉 内燃機関、殊にデイーゼルエンジンにおける排気ガス中
のカーボン等の未燃焼物（パティキュレート）を除去す
るため、セラミック製フイルタ体１を第５図の如き内燃
機関２の排気管系３の途中に設けたハウジング４に内装
してフイルタとし、これにより前記パティキュレートを
捕集してこれをバーナ５または電気ヒータで加熱し燃焼
せしめることは公知である。<Prior Art> In order to remove unburned substances (particulates) such as carbon in the exhaust gas of an internal combustion engine, especially a diesel engine, a ceramic filter body 1 is used for the exhaust pipe system of the internal combustion engine 2 as shown in FIG. It is known that the housing 4 provided in the middle of 3 serves as a filter to collect the particulates and heat them by the burner 5 or an electric heater to burn them.
この場合、従来のセラミック製フイルタ体１は第４図に
示すように、多孔質薄壁６により仕切られた多数の通路
７、７′、…を互いに平行に形成するとともに、相隣接
するガス通路７、７′…の入口側７ａ、７′ａ、…と出
口側７ｂ、７′ｂ、…とを交互に、いずれも同一厚さの
目封じ材８により閉塞したものである。In this case, as shown in FIG. 4, the conventional ceramic filter body 1 has a large number of passages 7, 7 ', ... The inlets 7a, 7'a, ... And the outlets 7b, 7'b, ... Of 7, 7 '... are alternately closed by a plugging material 8 having the same thickness.
これを前記ガス通路７、７′、…の入口側７ａ、７′
ａ、…または出口側７ｂ、７′ｂ、…からみれば、ほぼ
第６図（ａ）のようになり、このようなセラミック製フ
イルタ体１を、前記の如く内燃機関２の排気管系３の途
中に設けたハウジング４に内装するのである。This is the inlet side 7a, 7'of the gas passage 7, 7 ', ....
.. or the outlet sides 7b, 7'b, ... are almost as shown in FIG. 6 (a). Such a ceramic filter body 1 is used for the exhaust pipe system 3 of the internal combustion engine 2 as described above. It is installed in the housing 4 provided on the way.
内燃機関２を運転したとき、その排気ガスは第６図
（ｂ）の矢印のように、ガス通路７、７′、…の入口側
７ａ、７′ａ、…の開いた通路、例えば７ａから入って
多孔質薄壁６を通過して隣接するガス通路７′に進入
し、（このとき前記薄壁６によってパティキュレートが
捕集される）開いている出口側７′ｂから排出される。When the internal combustion engine 2 is operated, its exhaust gas flows from the open passages of the gas passages 7, 7 ', ..., 7a, 7'a, ..., as shown by the arrows in Fig. 6 (b), for example, 7a. It enters into the adjacent gas passage 7'through the porous thin wall 6 and is discharged from the open outlet side 7'b (where particulates are collected by the thin wall 6).
そして、捕集されたパティキュレートが前記ガス通路
７、７′…の多孔質薄壁６の全面に付着し、セラミック
製フイルタ体１のパティキュレート捕集能力が低下した
ときは、第５図に示す前記バーナ５等により前記フイル
タ１の前面を高温で加熱して前記多孔質薄壁６に付着し
たパティキュレートを燃焼させ、前記フイルタ体１の捕
集能力の再生を行なうのである。Then, when the collected particulates adhere to the entire surface of the porous thin wall 6 of the gas passages 7, 7 '..., and the particulate collection capacity of the ceramic filter body 1 is lowered, the results are shown in FIG. The front surface of the filter 1 is heated at a high temperature by the burner 5 and the like shown to burn the particulates adhering to the porous thin wall 6 to regenerate the collecting ability of the filter body 1.
ところが、前記バーナ５によりセラミック製フイルタ体
１の前面を加熱した場合、バーナ５の火焔が大きく広が
らないため、前記フイルタ体１の前面中心では強く加熱
されるが、周囲では加熱が弱いこと及び中心部は放熱の
少ないことから、前記フイルタ体１の中心部が高温とな
る。However, when the front surface of the ceramic filter body 1 is heated by the burner 5, since the flame of the burner 5 does not spread widely, the center of the front surface of the filter body 1 is strongly heated, but the heating is weak in the surroundings. Since the portion radiates less heat, the central portion of the filter body 1 has a high temperature.
またガス流が図示例の場合前記フイルタ体１の左から右
に流れることから、前記フイルタ体１の入口側７ａ、
７′ａ、…から出口側７ｂ、７′ｂ、…に向かって順次
温度が上昇する。Further, in the illustrated example, the gas flow flows from the left side to the right side of the filter body 1, so that the inlet side 7a of the filter body 1,
The temperature gradually increases from 7'a, ... To the outlet sides 7b, 7'b ,.
さらに、ガス流の前記の如き流れは、前記ハウジング４
の前後端が絞られていることから中心部で早く周縁部で
遅くなり、これによって前記フイルタ体１内部における
燃焼も中心部が周縁部より早く進行し、中心部の温度を
高める。Further, such a flow of gas flow is provided by the housing 4
Since the front and rear ends of the filter are narrowed, the central part is early and the peripheral part is late, so that the combustion in the filter body 1 also progresses faster in the central part than in the peripheral part and raises the temperature of the central part.
以上の点から、前記フイルタ体１内の軸心方向の温度分
布は、前記バーナ５に代って一様に加熱し得る電気ヒー
タを使用したとしても、第３図Ｂ（中心部の温度を示
す）、Ｄ（周縁部の温度を示す）及び第４図点線に示す
ように、入口側７ａ、７′ａ、…から出口側７ｂ、７′
ｂ、…に向かって順次温度が上昇する（勾配θ０）と同
時に、前記フイルタ体１の中心部と周縁部との温度差が
拡大し（前記第３図及び第４図）、このため前記出口側
７ｂ、７′ｂ、…付近のフイルタ体１には中心部と周縁
部との間に大きな熱勾配によって溶損を生じ、また第７
図に示すようにサーマルクラック９を発生し、前記パテ
ィキュレートの捕集能力を低下させ、また耐久性の面で
も問題となる。From the above points, the temperature distribution in the axial direction in the filter body 1 is as shown in FIG. 3B (the temperature of the central portion is changed even if an electric heater capable of uniformly heating the burner 5 is used). 4), D (indicates the temperature of the peripheral portion) and the dotted line in FIG. 4, from the inlet side 7a, 7'a, ... to the outlet side 7b, 7 '.
At the same time, the temperature gradually increases toward b, ... (Slope θ 0 ), and at the same time, the temperature difference between the central part and the peripheral part of the filter body 1 increases (FIGS. 3 and 4), and therefore In the filter body 1 near the outlet sides 7b, 7'b, ..., Melting loss occurs due to a large thermal gradient between the central portion and the peripheral portion, and
As shown in the figure, thermal cracks 9 are generated, the ability to collect the particulates is reduced, and there is a problem in terms of durability.
この問題に対応するため、例えば実開昭５９−６７５１
６号公報に開示された考案のように、パティキュレイト
捕集フイルタ（本考案セラミック製フイルタ体）の排ガ
ス出口側中央部に排気ガス上流側に向かう凹部を設けた
ものとか、或いは実公昭６３−３２８９０号公報に開示
された考案のように、セラミック体（本考案セラミック
製フイルタ体）の各チャンネル（本考案ガス通路）の出
口側の閉塞部の厚さが、セラミック体の中心部が周辺部
よりも厚くなるように形成したもの等がある。In order to deal with this problem, for example, Japanese Utility Model Laid-Open No. 59-6751
As in the invention disclosed in Japanese Patent Publication No. 6, a particulate trapping filter (ceramic filter body of the present invention) is provided with a recessed portion toward the exhaust gas upstream side in the central portion of the exhaust gas outlet side, or in Japanese Utility Model Publication 63. As disclosed in Japanese Patent Laid-Open No. 32890/1989, the thickness of the closed portion on the outlet side of each channel (the gas passage of the present invention) of the ceramic body (the ceramic filter body of the present invention) is such that the central portion of the ceramic body is the periphery Some of them are formed to be thicker than the part.
〈考案が解決しようとする問題点〉 前記実開昭に示された考案は、前記溶損を避けようとす
るものであるが、溶損はセラミック製フイルタ体の全長
に対し出口側の１／４〜１／３において生じやすいた
め、出口側の１／４〜１／３を取り去る必要がある。し
かし、このようにすると前記フイルタ体の表面積が大き
く減少し、パティキュレート捕集能力が激減するおそれ
がある。<Problems to be Solved by the Invention> Although the invention shown in the above-mentioned Kaikai is intended to avoid the above-mentioned melting loss, the melting loss is 1/100 at the outlet side with respect to the entire length of the ceramic filter body. Since it is likely to occur in 4 to 1/3, it is necessary to remove 1/4 to 1/3 on the outlet side. However, in this case, the surface area of the filter body is greatly reduced, and the particulate collection ability may be significantly reduced.
また前記実公昭に示された考案では、同実公昭公報にお
ける実施例に示された程度の厚さでは、第３図Ｃに示す
ように中心部の温度は前記従来品と余り変らず著しい温
度上昇を来し、周縁部との温度差も大きい。実公昭のも
ので前記溶損を避けようとすれば閉塞部（本考案目封じ
材）の厚さは前記実開昭と同様溶損の生ずる出口側の１
／４〜１／３（全長に対し）とする必要があるが、これ
も前記実開昭と同様前記フイルタ体の表面積を減少し、
パティキュレート捕集能力を激減せしめるおそれがあ
る。Further, in the device disclosed in the above-mentioned Japanese Utility Model Publication, at a thickness as shown in the embodiment of the same Japanese Utility Model Publication, the temperature of the central portion is not much different from that of the conventional product as shown in FIG. The temperature rises and the temperature difference with the peripheral part is large. If it is tried to avoid the above-mentioned melting loss with the actual one, the thickness of the blocking portion (sealing material of the present invention) is 1 at the outlet side where the melting loss occurs as in the above-mentioned actual opening.
It is necessary to set / 4 to 1/3 (relative to the total length), but this also reduces the surface area of the filter body as in the case of the actual Kaisho.
There is a danger that the ability to collect particulates will be drastically reduced.
本考案は上記に鑑み、パティキュレート捕集能力をほと
んど減少させることなく、セラミック製フイルタ体の中
心部における著しい温度上昇を抑え、これにより殊に出
口側の前記フイルタ体の溶損またはサーマルクラックの
発生を防止した排気浄化フイルタを提供することを目的
とする。In view of the above, the present invention suppresses a significant temperature rise in the central portion of the ceramic filter body with almost no decrease in the particulate collection capacity, and in particular, the melting or thermal cracking of the filter body on the outlet side is suppressed. It is an object of the present invention to provide an exhaust gas purification filter that prevents the generation of the exhaust gas.
〈問題を解決するための手段〉 上記目的を達成するための本考案の構成は、多孔質薄壁
により仕切られた多数の通路を互いに平行に形成すると
ともに、相隣接するガス通路の入口側と出口側とを交互
に目封じ材により閉塞し、かかるガス通路の入口側から
導入された排気ガスが前記薄壁を通過する際排気ガス中
の未燃焼成分を捕集し、これを燃焼せしめるようにした
セラミック製フイルタ体をもつ排気ガス浄化用フイルタ
において、ガス通路の入口側における目封じ材の厚さ
を、セラミック製フイルタ体の周縁部から中心部にかけ
て順次厚くなるように形成したものである。<Means for Solving the Problem> The structure of the present invention for achieving the above-mentioned object is to form a large number of passages partitioned by porous thin walls in parallel with each other, and to form an inlet side of adjacent gas passages. The outlet side is alternately closed by a plugging material, so that when the exhaust gas introduced from the inlet side of the gas passage passes through the thin wall, unburned components in the exhaust gas are collected and burned. In the exhaust gas purifying filter having the ceramic filter body described above, the thickness of the plugging material on the inlet side of the gas passage is formed so as to be gradually increased from the peripheral portion to the central portion of the ceramic filter body. .
〈作用〉 セラミック製フイルタ体１０内の多孔質薄壁１１に付着
したカーボン等のパティキュレートを燃焼させるため、
バーナ５により前記フイルタ体１０、ガス通路１２の入
口側１２ａ、１２′ａ、…を加熱した場合、前記フイル
タ体１０に伝わる熱は、前記入口側１２ａ、１２′ａ、
…の目封じ材１３の厚さが、前記フイルタ体１０の周縁
部から中心部にかけて順次厚くなるよう形成されている
ので、中心部ほど熱容量が大きく、従って中心部の著し
い温度上昇は抑制される。<Operation> In order to burn particulates such as carbon attached to the porous thin wall 11 in the ceramic filter body 10,
When the burner 5 heats the filter body 10 and the inlet sides 12a, 12'a, ... Of the gas passage 12, the heat transferred to the filter body 10 is the inlet sides 12a, 12'a ,.
Since the thickness of the plugging material 13 is gradually increased from the peripheral portion of the filter body 10 to the central portion thereof, the heat capacity is larger toward the central portion, and accordingly, the remarkable temperature rise in the central portion is suppressed. .
前記フイルタ体１０の入口側１２ａ、１２′ａ、…より
出口側１２ｂ、１２′ｂ、…にかけて順次温度が上昇す
るが、入口側１２ａ、１２′ａ、…の中心部の温度上昇
が抑えられているので、出口側１２ｂ、１２′ｂ、…に
おいても中心部と周縁部の温度差は小さく、従って前記
熱勾配も緩やかで、溶損またはサーマルクラックを生ず
ることが防止される。The temperature gradually rises from the inlet side 12a, 12'a, ... Of the filter body 10 to the outlet side 12b, 12'b, .. However, the temperature rise at the center of the inlet side 12a, 12'a ,. Therefore, the temperature difference between the central portion and the peripheral portion is small on the outlet sides 12b, 12'b, ..., Therefore, the thermal gradient is gentle, and melting damage or thermal cracking is prevented.
〈実施例〉 第１図乃至第３図により本考案を詳細に述べる。尚、第
４図以下と同一符号は同一部材または部品を示し、説明
を省略する。<Embodiment> The present invention will be described in detail with reference to FIGS. The same reference numerals as those in FIG. 4 and subsequent figures indicate the same members or parts, and the description thereof will be omitted.
本考案のセラミックス製フイルタ体１０は基本的には従
来のものと同様第１図に示すように、多孔質薄壁１１に
より仕切られた多数の通路１２、１２′、…を互いに平
行に形成するとともに、相隣接するガス通路１２、１
２′…の入口側１２ａ、１２′ａ、…と出口側１２ｂ、
１２′ｂ、…とを交互に、且つ前記フイルタ体１０の周
縁部から中心部にかけて順次厚くなるよう目封じ材１３
により閉塞したものである。The ceramic filter body 10 of the present invention basically has a plurality of passages 12, 12 ', ... Partitioned by a porous thin wall 11 in parallel with each other as shown in FIG. And the gas passages 12, 1 adjacent to each other
2 '... inlet side 12a, 12'a, ... and outlet side 12b,
12'b, ... Alternately, and the plugging material 13 is formed so that the thickness gradually increases from the peripheral portion to the central portion of the filter body 10.
It was blocked by.
前記目封じ材１３の厚さは、本考案者の研究によれば前
記中心部において通常の２倍程度（３０〜４０ミリメー
トル）とすればよい。このように構成された本考案セラ
ミック製フイルタ体１０は、前記と同様第２図のように
内燃機関２の排気管系３の途中に設けたハウジング４に
内装される。According to the research of the present inventor, the thickness of the plugging material 13 may be about twice as much as usual (30 to 40 mm) in the central portion. The thus constructed ceramic filter body 10 of the present invention is installed in the housing 4 provided in the middle of the exhaust pipe system 3 of the internal combustion engine 2 as shown in FIG.
内燃機関２を運転したときは、前記と同様その排気ガス
は第１図のガス通路１２、１２′、…の入口側１２ａ、
１２′ａ、…の開いた通路、例えば１２ａから入って多
孔質薄壁１１を通過して隣接するガス通路１２′に進入
し、このとき前記薄壁１１によってパティキュレートが
捕集され、開いている出口側１２′ｂから排出される。When the internal combustion engine 2 is operated, the exhaust gas thereof is the same as the above, the inlet side 12a of the gas passages 12, 12 ', ... Of FIG.
12'a, ... Opened passages, for example, 12a, are passed through the porous thin wall 11 to enter the adjacent gas passage 12 ', at which time particulates are collected and opened. It is discharged from the exit side 12'b.
セラミック製フイルタ体１０内の多孔質薄壁１１にカー
ボン等のパティキュレートが付着したときは、これを燃
焼させるため、バーナ５により前記フイルタ体１０、ガ
ス通路１２の入口側１２ａ、１２′ａ、…を加熱する。
この加熱により前記フイルタ体１０におけるガス通路１
２の入口側１２ａ、１２′ａ、…から出口側１２ｂ、１
２′ｂに伝熱されるが、前記入口側１２ａ、１２′ａ、
…の目封じ材１３の厚さが、前記フイルタ体１０の周縁
部から中心部にかけて順次厚くなるよう形成されている
ので、中心部ほど熱容量が大きく、従って中心部の著し
い温度上昇は抑制される。When particulates such as carbon adhere to the porous thin wall 11 in the ceramic filter body 10, the burner 5 burns the particulates, so that the burner 5 causes the filter body 10 and the inlet sides 12a, 12'a of the gas passages 12, ... is heated.
By this heating, the gas passage 1 in the filter body 10
2 from the inlet side 12a, 12'a, ... to the outlet side 12b, 1
2'b is transferred to the inlet side 12a, 12'a,
Since the thickness of the plugging material 13 is gradually increased from the peripheral portion of the filter body 10 to the central portion thereof, the heat capacity is larger toward the central portion, and accordingly, the remarkable temperature rise in the central portion is suppressed. .
第１図点線のように前記フイルタ体１０の入口側１２
ａ、１２′ａ、…より出口側１２ｂ、１２′ｂ、…にか
けて順次温度が上昇するが、入口側１２ａ、１２′ａ、
…の中心部の温度上昇が抑えられているの（勾配θ１）
で、出口側１２ｂ、１２′ｂ、…においても中心部と周
縁部の温度差は小さく、従って前記熱勾配も緩やかで
（第３図Ａ）、溶損またはサーマルクラックを生ずるこ
とが防止される。1, the inlet side 12 of the filter body 10 is indicated by the dotted line.
The temperature gradually increases from a, 12'a, ... to the outlet side 12b, 12'b, ..., but the inlet side 12a, 12'a,
The temperature rise in the central part of ... is suppressed (gradient θ 1 ).
At the outlets 12b, 12'b, ..., The temperature difference between the central portion and the peripheral portion is small, and therefore the thermal gradient is gentle (FIG. 3A), and melting loss or thermal cracking is prevented. .
〈考案の効果〉 本考案は多孔質薄壁により仕切られた多数の通路を互い
に平行に形成するとともに、相隣接するガス通路の入口
側と出口側とを交互に目封じ材により閉塞し、かかるガ
ス通路の入口側から導入された排気ガスが前記薄壁を通
過する際排気ガス中の未燃焼成分を捕集し、これを燃焼
せしめるようにしたセラミック製フイルタ体をもつ排気
ガス浄化用フイルタにおいて、ガス通路の入口側におけ
る目封じ材の厚さを、セラミック製フイルタ体の周縁部
から中心部にかけて順次厚くなるように形成したので、
パティキュレート捕集能力をほとんど減少させることな
く、セラミック製フイルタ体の中心部における著しい温
度上昇を抑え、これにより殊に出口側の前記フイルタ体
の溶損またはサーマルクラックの発生を防止することが
できる効果がある。<Effect of the Invention> The present invention forms a large number of passages partitioned by porous thin walls in parallel with each other, and alternately closes the inlet side and the outlet side of adjacent gas passages with a plugging material. In an exhaust gas purifying filter having a ceramic filter body which collects unburned components in the exhaust gas when the exhaust gas introduced from the inlet side of the gas passage passes through the thin wall and burns the unburned components. Since the thickness of the plugging material on the inlet side of the gas passage is gradually increased from the peripheral portion to the central portion of the ceramic filter body,
It is possible to suppress a significant temperature rise in the central portion of the ceramic filter body with almost no reduction in particulate collection capacity, and thereby to prevent melting damage or thermal cracking of the filter body particularly on the outlet side. effective.
第１図は本考案に係る排気ガス浄化用フイルタの縦断面
図、第２図は本考案フイルタを装着した内燃機関の排気
管系の一部切断概略図、第３図は排気ガス浄化用フイル
タの性能比較図、第４図は従来の排気ガス浄化用フイル
タの縦断面図、第５図は従来フイルタを装着した内燃機
関の排気管系の一部切断概略図、第６図は模式的に示し
たセラミック製フイルタを示し、同図（ａ）は側面図、
（ｂ）は縦断面図である。また第７図は第６図（ａ）の
部分拡大図である。 ２；内燃機関、３；排気管系、４；ハウジング、 ５；バーナ、１０；セラミック製フイルタ体、 １１；多孔質薄壁、１２；ガス通路、 １２ａ、１２′ａ、…；入口側、 １２ｂ、１２′ｂ、…；出口側、 １３；目封じ材。FIG. 1 is a vertical cross-sectional view of an exhaust gas purifying filter according to the present invention, FIG. 2 is a partially cutaway schematic view of an exhaust pipe system of an internal combustion engine equipped with the present invention filter, and FIG. 3 is an exhaust gas purifying filter. FIG. 4 is a longitudinal sectional view of a conventional exhaust gas purifying filter, FIG. 5 is a partially cutaway schematic view of an exhaust pipe system of an internal combustion engine equipped with a conventional filter, and FIG. 6 is a schematic diagram. The ceramic filter shown is shown in FIG.
(B) is a longitudinal sectional view. FIG. 7 is a partially enlarged view of FIG. 6 (a). 2; internal combustion engine, 3; exhaust pipe system, 4; housing, 5; burner, 10; ceramic filter body, 11; porous thin wall, 12; gas passage, 12a, 12'a, ...; inlet side, 12b , 12'b, ...; outlet side, 13; plugging material.
Claims (1)
互いに平行に形成するとともに、相隣接するガス通路の
入口側と出口側とを交互に目封じ材により閉塞し、かか
るガス通路の入口側から導入された排気ガスが前記薄壁
を通過する際排気ガス中の未燃焼成分を捕集し、これを
燃焼せしめるようにしたセラミック製フイルタ体をもつ
排気ガス浄化用フイルタにおいて、ガス通路の入口側に
おける目封じ材の厚さを、セラミック製フイルタ体の周
縁部から中心部にかけて順次厚くなるように形成したこ
とを特徴とする排気ガス浄化用フイルタ。1. A plurality of passages partitioned by porous thin walls are formed in parallel with each other, and the inlet side and the outlet side of adjacent gas passages are alternately closed by a plugging material, and the gas passages An exhaust gas purifying filter having a ceramic filter body which collects unburned components in the exhaust gas when the exhaust gas introduced from the inlet side passes through the thin wall and burns the unburned components The exhaust gas purifying filter, wherein the thickness of the plugging material on the inlet side of the filter is formed such that the thickness gradually increases from the peripheral portion to the central portion of the ceramic filter body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14106588U JPH0631133Y2 (en) | 1988-10-31 | 1988-10-31 | Exhaust gas purification filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14106588U JPH0631133Y2 (en) | 1988-10-31 | 1988-10-31 | Exhaust gas purification filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0263020U JPH0263020U (en) | 1990-05-11 |
| JPH0631133Y2 true JPH0631133Y2 (en) | 1994-08-22 |
Family
ID=31405806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14106588U Expired - Fee Related JPH0631133Y2 (en) | 1988-10-31 | 1988-10-31 | Exhaust gas purification filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631133Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002136817A (en) * | 2000-11-06 | 2002-05-14 | Ngk Insulators Ltd | Honeycomb filter and its manufacturing method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3012167B2 (en) * | 1995-04-12 | 2000-02-21 | 日本碍子株式会社 | Exhaust gas purification filter and exhaust gas purification device using the same |
| JP4279497B2 (en) * | 2002-02-26 | 2009-06-17 | 日本碍子株式会社 | Honeycomb filter |
| JP3971215B2 (en) * | 2002-03-13 | 2007-09-05 | 日本碍子株式会社 | Exhaust gas purification filter |
| KR100766357B1 (en) | 2004-03-23 | 2007-10-15 | 니뽄 가이시 가부시키가이샤 | Ceramic filter |
| JP5171279B2 (en) * | 2008-01-17 | 2013-03-27 | 京セラ株式会社 | Honeycomb structure, filter and exhaust gas treatment device |
| JP6639977B2 (en) * | 2016-03-23 | 2020-02-05 | 日本碍子株式会社 | Honeycomb filter |
-
1988
- 1988-10-31 JP JP14106588U patent/JPH0631133Y2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002136817A (en) * | 2000-11-06 | 2002-05-14 | Ngk Insulators Ltd | Honeycomb filter and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0263020U (en) | 1990-05-11 |
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| LAPS | Cancellation because of no payment of annual fees |