JP2816989B2 - Exhaust gas purification device for internal combustion engine - Google Patents
Exhaust gas purification device for internal combustion engineInfo
- Publication number
- JP2816989B2 JP2816989B2 JP1220264A JP22026489A JP2816989B2 JP 2816989 B2 JP2816989 B2 JP 2816989B2 JP 1220264 A JP1220264 A JP 1220264A JP 22026489 A JP22026489 A JP 22026489A JP 2816989 B2 JP2816989 B2 JP 2816989B2
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- exhaust
- pipe
- internal combustion
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) この発明は、内燃機関の排気ガス浄化装置に関する。Description: TECHNICAL FIELD The present invention relates to an exhaust gas purifying apparatus for an internal combustion engine.
(従来の技術) 自動車などに搭載する内燃機関では、内燃機関の排気
口に連結する排気多岐管に、セラミックのハニカム状の
担体に触媒を付着させた触媒体を取付け、排気ガスを触
媒体の間を通して酸化反応を起させて、排気ガス中の未
燃成分を浄化するようにしている。又、オートバイなど
に搭載する小型の内燃機関では、内燃機関の排気口に連
結する排気管の内面に、ガラスウールなどの布体に触媒
剤を付着した触媒体を張って、押え片などで押え、排気
ガスを触媒体に触れさせて未燃成分を浄化するようにし
ている。例えば、特公昭59−1324号公報、特開昭61−96
120号公報参照。(Prior Art) In an internal combustion engine mounted on an automobile or the like, a catalyst body formed by attaching a catalyst to a ceramic honeycomb-shaped carrier is attached to an exhaust manifold connected to an exhaust port of the internal combustion engine, and the exhaust gas is supplied to the catalyst body. An oxidation reaction is caused to pass through to purify unburned components in the exhaust gas. Also, in the case of a small internal combustion engine mounted on a motorcycle, etc., a catalyst body with a catalyst attached to a cloth body such as glass wool is stretched on the inner surface of an exhaust pipe connected to the exhaust port of the internal combustion engine, and pressed with a holding piece. In addition, the exhaust gas is brought into contact with the catalyst to purify unburned components. For example, JP-B-59-1324, JP-A-61-96
See No. 120 publication.
(発明が解決しようとする課題) ハニカム状の触媒体は、排気ガスがハニカム状の多数
の小孔を通るので流路面積が減少すると共に抵抗が多
く、機関の出力が低下し、特に小型の機関では、出力低
下によって受ける性能低下の影響が大きい。又、排気多
岐管が大きくなって重くなる不都合がある。又、排気管
に布状の触媒体を張ったものは、取付けるのに面倒で、
コスト高になり、耐熱性や耐久性にも問題がある。(Problems to be Solved by the Invention) Since the exhaust gas passes through a large number of honeycomb-shaped small holes, the honeycomb-shaped catalyst body has a reduced flow path area, a large resistance, a reduced engine output, and a particularly small-sized catalyst body. In an engine, the effect of the performance deterioration caused by the output decrease is large. Further, there is a disadvantage that the exhaust manifold becomes large and heavy. Also, the one with a cloth-like catalyst body attached to the exhaust pipe is troublesome to install,
The cost is high, and there are also problems with heat resistance and durability.
この発明は、かかる点に鑑み、排気管の内側に間隔を
設けて多数の通気孔を有する内管を取付け、この内管に
触媒溶液と触媒担体からなるスラリーを付着させ、排気
管を流れる排気ガスを触媒に触れさせて浄化でき、排気
抵抗が少く、安価で軽量にできて耐久性も高い内燃機関
の排気ガス浄化装置を得ることを目的とする。In view of the above, the present invention provides an inner pipe having a large number of ventilation holes at intervals inside the exhaust pipe, adheres a slurry composed of a catalyst solution and a catalyst carrier to the inner pipe, and exhausts the exhaust gas through the exhaust pipe. An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can purify gas by contacting the catalyst, has low exhaust resistance, is inexpensive and lightweight, and has high durability.
(課題を解決するための手段) 上記目的を達成するために、この発明の内燃機関の排
気ガス浄化装置は、内燃機関の排気口に連結する排気管
内に間隔を設けて内管を取り付けるようにし、排気管と
内管を鋼板またはステンレス鋼板を用いて左右分けて成
形したものを合わせ、かつ、内管の合せ縁を排気管の合
せ縁の間に挟んで一体に溶着して取り付けるようにし、
前記内管は多数の通気孔を穿設したものであって、内管
の内外表面に触媒に無毒性のアルミナなどの金属または
セラミック、サーメットなどの凹凸層を溶射して設け、
かつ、該凹凸層に触媒溶液と触媒担体からなるスラリー
を塗布して付着させると共に乾燥焼成することにより、
前記凹凸層の表面に触媒を含んだ担体を付着・密着させ
たものとし、排気管内を流れる排気ガスを触媒に当てて
浄化するようにしたものである。(Means for Solving the Problems) In order to achieve the above object, an exhaust gas purifying apparatus for an internal combustion engine according to the present invention is configured such that an inner pipe is attached to an exhaust pipe connected to an exhaust port of the internal combustion engine at intervals. , The exhaust pipe and the inner pipe are formed separately by using a steel plate or a stainless steel plate, and they are joined together, and the fitting edge of the inner pipe is sandwiched between the fitting edges of the exhaust pipe so as to be integrally welded and attached,
The inner tube has a large number of ventilation holes, and a non-toxic metal such as alumina or ceramic such as alumina, and a concavo-convex layer such as cermet are provided by spraying on the inner and outer surfaces of the inner tube,
And, by applying and attaching a slurry comprising a catalyst solution and a catalyst carrier to the uneven layer, and by drying and firing,
A carrier containing a catalyst is attached and adhered to the surface of the uneven layer, and the exhaust gas flowing through the exhaust pipe is applied to the catalyst to purify the catalyst.
(作 用) 内管は、多数の通気孔をパンチングして設け、排気管
の内側に間隔を設けて取付けるので、排気ガスが通気孔
を通って出入りして流れることができる。排気管及び内
管は、鋼板又はステンレス鋼板で作るもので、このまま
では、触媒を付けることができない。内管の内外表面
に、触媒に無毒性のアルミナなどの金属又はセラミッ
ク、サーメットなどを溶射することによって、表面に細
かい凹凸がある凹凸層を設けることによって、この凹凸
層に、触媒溶液と触媒担体からなるスラリーを塗布する
ことができ、これを乾燥焼成して密着させることができ
る。そして、排気管内を排気ガスが流れるとき、内管表
面の触媒に触れ、酸化反応を起して、排気ガス中の未燃
成分を浄化することができる。(Operation) Since the inner pipe is provided with a number of vent holes punched and attached at intervals inside the exhaust pipe, exhaust gas can flow in and out through the vent holes. The exhaust pipe and the inner pipe are made of a steel plate or a stainless steel plate, and a catalyst cannot be attached as it is. By spraying a non-toxic metal such as alumina or ceramic, cermet, etc. on the inner and outer surfaces of the inner tube, a catalyst solution and a catalyst carrier are provided on the uneven layer. Slurry can be applied, and the slurry can be dried and fired to adhere. Then, when the exhaust gas flows in the exhaust pipe, the exhaust gas touches a catalyst on the surface of the inner pipe to cause an oxidation reaction, thereby purifying unburned components in the exhaust gas.
(実施例) 以下、本発明の実施例を図面によって説明する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
内燃機関1の排気口2に、排気管3を連結する。排気
管3内には、間隔4を設けて、内管5を取付ける。排気
管3と内管5は、鋼板又はステンレス鋼板を用いて、左
右に分けて成形し、これを合せて溶着するようにしてあ
り、内管5の合せ縁を排気管3の合せ縁の間に挟んで一
体に溶着して取付けるようにしてある。内管5には、多
数の通気孔6をパンチングによって穿設する。内管5の
内外表面には、第2図乃至第4図に示すように、触媒に
無毒性のアルミナなどの金属又はセラミック、サーメッ
トなどを一層又は二層溶射し、表面に細かい凹凸がある
凹凸層7を設ける。又、凹凸層7の表面は、グリッドブ
ラストなどによって一層粗面に形成してもよい。そし
て、凹凸層7に、第5図に示すように、触媒溶液と触媒
担体8からなるスラリー11を塗布などによって付着さ
せ、これを乾燥焼成すると、第6図に示すように、凹凸
層7の表面に、触媒を含んだ担体8が密着する。これに
よって、触媒が直接内管5に触れることがなく、触媒が
毒性で破損することが防げる。又、排気管3の内面に同
様に追加して、凹凸層を設けて触媒の担体を密着させれ
ば、浄化能力を一層向上でき、凹凸層が断熱することが
できて触媒活性温度に保ち易くできる。An exhaust pipe 3 is connected to an exhaust port 2 of the internal combustion engine 1. An inner pipe 5 is attached to the exhaust pipe 3 with a space 4 therebetween. The exhaust pipe 3 and the inner pipe 5 are formed separately from right and left using a steel plate or a stainless steel plate, and are welded together. And welded together to attach. A number of ventilation holes 6 are formed in the inner tube 5 by punching. As shown in FIGS. 2 to 4, the inner or outer surface of the inner tube 5 is sprayed with one or two layers of non-toxic metal such as alumina or ceramic, cermet, or the like as shown in FIGS. Layer 7 is provided. Further, the surface of the uneven layer 7 may be formed to be rougher by grid blasting or the like. Then, as shown in FIG. 5, a slurry 11 composed of a catalyst solution and a catalyst carrier 8 is applied to the uneven layer 7 by coating or the like, and dried and fired, as shown in FIG. The carrier 8 containing the catalyst adheres to the surface. As a result, the catalyst does not directly touch the inner tube 5 and the catalyst is prevented from being toxic and damaged. Similarly, if an uneven layer is additionally provided on the inner surface of the exhaust pipe 3 and the catalyst carrier is adhered to the catalyst, the purification ability can be further improved, the uneven layer can be insulated, and the catalyst activation temperature can be easily maintained. it can.
排気ガスは、排気管3内を流れる間に、内管5の触媒
の担体8に触れて酸化反応を起し、排気ガス中の未燃成
分を浄化できる。While flowing through the exhaust pipe 3, the exhaust gas contacts the catalyst carrier 8 of the inner pipe 5 to cause an oxidation reaction, thereby purifying unburned components in the exhaust gas.
尚、排気管3の後端には膨脹室9を連結し、更に、膨
脹室9にマフラ10を連結して、マフラ10で消音して、マ
フラ10の後端から排気ガスを放出する。An expansion chamber 9 is connected to the rear end of the exhaust pipe 3, and a muffler 10 is connected to the expansion chamber 9. The muffler 10 silences the exhaust gas and discharges exhaust gas from the rear end of the muffler 10.
(発明の効果) 以上説明したように、この発明は、上述のように構成
したので、排気管内に取付ける内管の内外表面に、触媒
に無毒性のアルミナなどの金属又はセラミック、サーメ
ットなどを溶射して凹凸層を設け、かつ、該凹凸層に触
媒溶液と触媒担体からなるスラリーを塗布して付着させ
ると共に乾燥焼成することにより、前記凹凸層の表面に
触媒を含んだ担体を強固に付着・密着させることができ
る。そして、触媒によって排気管内を流れる排気ガスの
未燃成分を浄化することができる。内管は、排気管に簡
単に取付けでき、構造簡単で軽量安価にでき、触媒の密
着性も高くて耐久性が高く、排気の抵抗が少くて、出力
低下の少いものにできる。(Effects of the Invention) As described above, since the present invention is configured as described above, a non-toxic metal such as alumina or a ceramic, a cermet, or the like is sprayed on the inner and outer surfaces of the inner pipe attached to the exhaust pipe. By providing a concavo-convex layer, and applying and attaching a slurry comprising a catalyst solution and a catalyst carrier to the concavo-convex layer and drying and firing, the carrier containing the catalyst is firmly attached to the surface of the concavo-convex layer. Can be in close contact. Then, the unburned components of the exhaust gas flowing through the exhaust pipe can be purified by the catalyst. The inner pipe can be easily attached to the exhaust pipe, the structure can be made simple, light and inexpensive, the adhesion of the catalyst is high, the durability is high, the exhaust resistance is low, and the output is low.
図は本発明の一実施例を示し、 第1図は排気管の横断面図、 第2図は内管に凹凸層を溶射する状態の一部横断面図、 第3図は内管に一層の凹凸層を溶射した一部拡大断面
図、 第4図は内管に二層の凹凸層を溶射した一部拡大断面
図、 第5図は内管の凹凸層に触媒担体を塗付した一部拡大断
面図、 第6図は同焼成後の拡大断面図、 第7図は排気管の一部縦断側面図、 第8図は全体側面図、 である。 1……内燃機関、2……排気口、3……排気管、4……
間隔、5……内管、6……通気孔、7……凹凸層、8…
…触媒担体。FIG. 1 shows an embodiment of the present invention. FIG. 1 is a cross-sectional view of an exhaust pipe, FIG. 2 is a partial cross-sectional view of a state where an uneven layer is sprayed on an inner pipe, and FIG. FIG. 4 is a partially enlarged cross-sectional view of the inner tube sprayed with two uneven layers, and FIG. 5 is a partially enlarged cross-sectional view of the inner tube sprayed with a catalyst carrier. 6 is an enlarged sectional view after the firing, FIG. 7 is a partially longitudinal side view of the exhaust pipe, and FIG. 8 is an overall side view. 1 ... internal combustion engine, 2 ... exhaust port, 3 ... exhaust pipe, 4 ...
Interval: 5 ... Inner tube, 6: Vent, 7: Uneven layer, 8:
... catalyst carrier.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) F01N 3/24 F01N 3/28 301──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F01N 3/24 F01N 3/28 301
Claims (1)
隔を設けて内管を取り付けるようにし、 排気管と内管を鋼板またはステンレス鋼板を用いて左右
分けて成形したものを合わせ、かつ、内管の合せ縁を排
気管の合せ縁の間に挟んで一体に溶着して取り付けるよ
うにし、 前記内管は多数の通気孔を穿設したものであって、内管
の内外表面に触媒に無毒性のアルミナなどの金属または
セラミック、サーメットなどの凹凸層を溶射して設け、
かつ、該凹凸層に触媒溶液と触媒担体からなるスラリー
を塗布して付着させると共に乾燥焼成することにより、
前記凹凸層の表面に触媒を含んだ担体を付着・密着させ
たものとし、 排気管内を流れる排気ガスを触媒に当てて浄化するよう
にしたことを特徴とする内燃機関の排気ガス浄化装置。An inner pipe is attached with a space provided in an exhaust pipe connected to an exhaust port of an internal combustion engine, and the exhaust pipe and the inner pipe are formed by using a steel plate or a stainless steel plate so as to be divided into left and right parts, and The inner pipe is sandwiched between the mating edges of the exhaust pipe and is integrally welded and attached. The inner pipe has a large number of ventilation holes, and a catalyst is provided on the inner and outer surfaces of the inner pipe. Non-toxic metal such as alumina or ceramic, uneven surface layer such as cermet is sprayed and provided,
And, by applying and attaching a slurry comprising a catalyst solution and a catalyst carrier to the uneven layer, and by drying and firing,
An exhaust gas purifying apparatus for an internal combustion engine, wherein a carrier containing a catalyst is adhered and adhered to the surface of the uneven layer, and exhaust gas flowing in an exhaust pipe is applied to the catalyst to purify the exhaust gas.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1220264A JP2816989B2 (en) | 1989-08-29 | 1989-08-29 | Exhaust gas purification device for internal combustion engine |
KR1019900013238A KR920007887B1 (en) | 1989-08-29 | 1990-08-27 | Exhaust gas cleaning device for internal combustion engine |
US07/573,753 US5151254A (en) | 1989-08-29 | 1990-08-28 | Exhaust gas cleaning device for internal combustion engine |
DE69026445T DE69026445T2 (en) | 1989-08-29 | 1990-08-28 | Exhaust gas purification device for internal combustion engines |
AT90116493T ATE136622T1 (en) | 1989-08-29 | 1990-08-28 | EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINES |
EP90116493A EP0415356B1 (en) | 1989-08-29 | 1990-08-28 | Exhaust gas cleaning device for internal combustion engine |
ES90116493T ES2085304T3 (en) | 1989-08-29 | 1990-08-28 | EXHAUST GAS TREATMENT DEVICE FOR INTERNAL COMBUSTION ENGINES. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1220264A JP2816989B2 (en) | 1989-08-29 | 1989-08-29 | Exhaust gas purification device for internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0385316A JPH0385316A (en) | 1991-04-10 |
JP2816989B2 true JP2816989B2 (en) | 1998-10-27 |
Family
ID=16748458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1220264A Expired - Fee Related JP2816989B2 (en) | 1989-08-29 | 1989-08-29 | Exhaust gas purification device for internal combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2816989B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW268072B (en) * | 1993-12-09 | 1996-01-11 | Honda Motor Co Ltd | |
JP3257906B2 (en) * | 1994-09-05 | 2002-02-18 | 本田技研工業株式会社 | Engine exhaust purification device |
JP3614206B2 (en) * | 1995-05-25 | 2005-01-26 | 本田技研工業株式会社 | Exhaust gas purification device for internal combustion engine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5342848A (en) * | 1976-09-30 | 1978-04-18 | Yokogawa Hokushin Electric Corp | Current limiting circuit for two wire type transmitter |
JPH0621559B2 (en) * | 1984-10-16 | 1994-03-23 | ヤマハ発動機株式会社 | Exhaust pipe of 2-cycle engine |
-
1989
- 1989-08-29 JP JP1220264A patent/JP2816989B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0385316A (en) | 1991-04-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |