JP4367672B2

JP4367672B2 - Exhaust gas purification device for vehicles

Info

Publication number: JP4367672B2
Application number: JP20673099A
Authority: JP
Inventors: 智英中村; 泰雄鯵坂
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-21
Filing date: 1999-07-21
Publication date: 2009-11-18
Anticipated expiration: 2019-07-21
Also published as: JP2001032711A

Description

【０００１】
【発明の属する技術分野】
本発明は、車両に搭載された車両駆動用エンジンから排出された排気ガスを大気中に放出させる排気系統の排気口付近に取り付けられ、当該排気ガスを浄化した後に大気中に放出する車両用排気ガス浄化装置の改良に関する。
【０００２】
【従来の技術】
この種の自動車等の車両は、原動機としてガソリンエンジンやディーゼルエンジンを搭載し、当該エンジンでガソリンや軽油などの燃料を燃焼させることにより移動することができるものとして知られている。
【０００３】
図６は、従来の車両用排気ガス浄化装置を接続した車両の具体例を示す図である。この図６において、車両１は、当該エンジン２から排出された排気ガスを、エキゾーストマニホールド３、フロント排気チューブ４、キャタライザ５、センター排気チューブ６、マフラー７及び後端部８からなる排気系統９の後端部８を介して排出するようになっており、この後端部８に従来の車両用排気ガス浄化装置Ｊを連結し、当該車両用排気ガス浄化装置Ｊにおいて、さらに排ガスを浄化してから大気中に放出するようにしている（特開平１１−６２５５０号公報参照）。
【０００４】
上述した従来の車両用排気ガス浄化装置Ｊは、排気系統９から取り込んだ排気ガスを触媒に接触させて排気ガスの浄化を進めた後に、浄化されたガスに外気を取り込んで混合攪拌させてガス温度を低下させることにより有害物質の無害化するようにしている。
【０００５】
【発明が解決しようとする課題】
しかしなから、上述した従来の車両用排気ガス浄化装置では、高温の排気ガスに触媒が曝されることから触媒の寿命が短くなるという欠点があった。
【０００６】
また、上記従来の車両用排気ガス浄化装置では、触媒層に接触した後の排気ガスに外気を取り入れて攪拌混合させているだけであるので、有害物質が大気に放出されてしまう可能性がある他、有害物質を無害化することが十分に行われないという欠点もあった。
【０００７】
本発明は、上述した従来装置の欠点を解消し、有害物質の無害化をより一層促進させるとともに、触媒の長寿命化を図った車両用排気ガス浄化装置を提供することを目的としている。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、請求項１記載の発明に係る車両用排気ガス浄化装置は、車両に搭載された車両駆動用エンジンから排出された排気ガスを大気中に放出させる排気系統の排気口付近に取り付けられ、当該排気ガスを浄化した後に大気中に放出する車両用排気ガス浄化装置において、前記排気系統から排気ガスを受け入れる段階で外気を取り入れる第１の外気導入手段と、前記排気ガスと第１の外気導入手段から取り込んだ外気との混合ガスを触媒層に接触させて無害化する触媒室と、前記触媒室の前記触媒層に新たな外気を導き前記触媒層に接触させる第２の外気導入手段と、前記触媒室の触媒層にて有害物質を取り除かれたガス体を大気中に放出する段階でさらに外気を取り入れ当該ガス体と混合し当該ガス体の温度を低下させる第３の外気導入手段とを設けてなることを特徴とするものである。
【０００９】
したがって、請求項１記載の発明によれば、エンジンにおいて燃料が燃焼されることにより生じる排気ガスは、排気系統を介して車両用排気ガス浄化装置に導入されると、第１の外気導入手段により外気が取り入れられて排気ガスと攪拌混合されて排気ガスの温度を低下させて有害物質の無害化を促進させる。また、第２の外気導入手段によって外気を取り込んで触媒室の触媒層に外気を供給し、触媒層を冷却することにより寿命を延ばしている。触媒室の触媒層で浄化されたガスは、さらに、第３の外気導入手段により取り込まれた外気と混合攪拌されることにより、さらに、ガス温度を低下させて有害物質の無害化をさらに促進させている。
【００１０】
請求項２記載の発明では、請求項１において、前記第１の外気導入手段は、前記排気系統に接続するための接続機構を有し、かつ、前記排気系統から受け入れた排気ガスを次段に導く排気ガス通路の一部を、他の排気ガス通路よりも細くし、当該細くした一部通路に第１外気取入れ口を設けてなる接続管からなることを特徴とするものである。
【００１１】
請求項３記載の発明では、請求項１において、前記触媒室は、所定の長さの外筒と、この外筒の内部に収納され当該外筒より長さが短い網目体で構成してなる中筒及び最内筒と、前記中筒と最内筒との間に収納した触媒層と、前記接続管からの排気ガス空気混合体を前記外筒と中筒の間に導くガス通路とを備え、前記最内筒の一端開放口から大気に向けて浄化後のガスを放出するようにしてなり、
前記第２の外気導入手段は、前記外筒の前方側壁に設けた第２外気取入れ口と、当該第２外気取入れ口から取り入れた外気を中筒と最内筒の間に収納した触媒層に導く外気通路とからなり、
前記第３の外気導入手段は、外筒の後方側壁とほぽ同じ面積の板体の中央に前記最内筒の筒寸法とほぼ同じ寸法に孔を設け、当該孔に連通する筒体を前記円板に設け、当該板体を前記外筒の後側側壁に一定間隔を持たせて取り付けて前記外筒の後方側壁と前記板体との間隙でもって第３外気取入れ口を形成したことを特徴とするものである。
【００１２】
請求項４記載の発明では、請求項１において、前記第１の外気導入手段は、前記排気系統に接続するための接続機構を有し、かつ、前記排気系統から受け入れた排気ガスを次段に導く排気ガス通路の一部を、他の排気ガス通路よりも細くし、当該細くした一部通路に第１外気取入れ口を設け、かつ、前記細くした一部通路の第１外気取入れ口の後方に永久磁石を配置してなることを特徴とするものである。
【００１３】
上記目的を達成するために、請求項５記載の発明に係る車両用排気ガス浄化装置は、車両に搭載された車両駆動用エンジンから排出された排気ガスを大気中に放出させる排気系統の排気口付近に取り付けられ、当該排気ガスを浄化した後に大気中に放出する車両用排気ガス浄化装置において、前記排気系統に接続するための接続機構を有し、かつ、前記排気系統から受け入れた排気ガスを次段に導く排気ガス通路の一部を、他の排気ガス通路よりも細くし、当該細くした一部通路に第１外気取入れ口を設けてなる接続管からなる第１の外気導入手段と、所定の長さの外筒の内部に収納され当該外筒より長さが短い網目体で構成してなる中筒及び最内筒を有し、前記中筒と最内筒との間に触媒層を収納し、前記接続管からの排気ガス空気混合体を前記外筒と中筒の間に導くガス通路とを備え、前記最内筒の一端開放口から大気に向けて浄化後のガスを放出するようにしてなる触媒室と、前記外筒の前方側壁に第２外気取入れ口を設け、当該第２外気取入れ口から取り入れた外気を中筒と最内筒の間に収納した触媒層に導く外気通路を設けてなる第２の外気導入手段と、前記外筒の後方側壁とほぽ同じ面積の板体の中央に前記最内筒の筒寸法とほぼ同じ寸法に孔を設け、当該孔に連通する筒体を前記円板に設け、当該板体を前記外筒の後側側壁に一定間隔を持たせて取り付けて前記外筒の後方側壁と前記板体との間隙でもって第３外気取入れ口を形成してなる第３の外気導入手段とを備えたことを特徴とするものである。
【００１４】
したがって、請求項５記載の発明では、エンジンにおいて燃料が燃焼されることにより生じる排気ガスは、前記排気系統から接続管に入って他の排気ガス通路よりも細くした部分を通過する際に、排気ガスの流速が高速になり圧力が低下するため第１外気取入れ口から外気を取り入れることになって排気ガスと外気とが混合攪拌されて、排気ガスの温度を低下させて有害物質の無害化を促進させることになる。また、前記外筒の内部に収納された中筒及び最内筒との間に収納された触媒層に前記接続管からの排気ガス空気混合体を接触させるが、この際に、当該第２外気取入れ口から取り入れた外気を触媒層に導き、触媒層を冷却することにより触媒の寿命を長くさせている。また、前記最内筒の一端開放口から大気に向けて浄化後のガスを放出しているが、その際に、前記外筒の後側側壁に一定間隔を持たせて取り付けた板体との間隙でもって形成された第３外気取入れ口から外気を取り入れ、浄化後のガスと混合攪拌させてから大気中へ放出させることにより、放出されるガス温度をさらに低下させて有害物質の無害化をより一層促進させている。
【００１５】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。
【００１６】
図１乃至図６は本発明の実施の形態に係る車両用排気ガス浄化装置を説明するための図である。ここに、図１は、同浄化装置の全体構造を示す縦断面図である。図２は、同浄化装置における第１の外気導入手段を構成する接続管の内部構造を示す側面図である。図３は、同浄化装置における第１の外気導入手段を構成する接続管の要部を示す横断面図である。図４は同浄化装置における第１の外気導入手段を構成する接続機構の例を示す正面図である。図５は、同浄化装置の外筒の構成状態を示す図である。
【００１７】
この図１に示す本発明の実施の形態に係る車両用排気ガス浄化装置１０は、従来の車両用排気ガス浄化装置Ｊと同様に排気系統９の後端部８に取り付けて使用されるものであり、エンジン２において燃料が燃焼したことにより発生した排気ガスを浄化した後に大気中に放出できる（図６参照）。
【００１８】
これら図１乃至図３において、上記車両用排気ガス浄化装置１０は、大別すると、排気系統から排気ガスを受け入れる段階で外気を取り入れる第１の外気導入手段２０と、前記排気ガスと第１の外気導入手段２０から取り込んだ外気との混合ガスを触媒層Ｓに接触させて無害化する触媒室３０と、前記触媒室３０の前記触媒層Ｓに新たな外気を導き前記触媒層に接触させる第２の外気導入手段４０と、前記触媒室３０の触媒層Ｓにて有害物質を取り除かれたガス体を大気中に放出する段階でさらに外気を取り入れ当該ガス体と混合し当該ガス体の温度を低下させる第３の外気導入手段５０とからなる。
【００１９】
さらに詳細に説明すると、前記第１の外気導入手段２０は、図１乃至図４に示すように、前記排気系統９の後端部８（図６参照）に接続するための接続機構２１と、前記排気系統９から受け入れた排気ガスを次段に導く排気ガス通路の一部２２を他の排気ガス通路２３よりも細くし、当該細くした一部通路２２に第１外気取入れ口２４，２４，２４，２４を設けてなる接続管２５とから構成されている。また、この第１の外気導入手段２０には、図１及び図３に示すように、前記細くした一部通路２２の第１外気取入れ口２４，２４，２４，２４の後方に軸対象に極性が相対するように永久磁石２６，２７が配置されている。
【００２０】
また、上述した接続機構２１は、図４に示すように、略Ω字状の金具２１ａの両端部２１ｂにボルト孔を設け、これら二つの略Ω字状の金具２１ａの各両端部２１ｂ，２１ｂ、２１ｂ，２１ｂを合わせて、かつ、当該両端部２１ｂ、２１ｂにボルト２１ｃを挿通した後にボルト２１ｃにナット２１ｄを螺着し、取り付け状態に応じてボルト２１ｃ・ナット２１ｄで締めつける。
【００２１】
なお、接続管２５の後方側にも接続機構２８が設けられており、この接続機構２８によって接続管２５に触媒室３０を取り付け固定することができる。もちろん、当該接続機構２８も接続機構２１と同様の構成をしている。
【００２２】
また、この接続管２５は、図１に示すように、排気系統９の後端部８（図６参照）よりやや大きな口径の他の排気ガス通路２３ａの部分と、これよりは径を細くした一部通路２２の部分と、前記排気ガス通路２３ａと同じ径の排気ガス通路２３ｂの部分とからなり、これらの間は所定の角度の斜面が形成されていて排ガスの流れに渦を生じさせないようになっている。
【００２３】
前記触媒室３０は、所定の長さＬの外筒３１と、この外筒３１の内部に収納され当該外筒３１より長さが短い網目体で構成してなる中筒３２及び最内筒３３と、前記中筒３２と最内筒３３との間に収納した触媒層Ｓと、前記接続管２５からの排気ガス空気混合体を前記外筒３１と中筒３２の間に導くガス通路３４とを備え、前記最内筒３３の一端開放口３５から大気に向けて浄化後のガスを放出するようになっている。なお、外筒３１、中筒３２及び最内筒３３は、ステンレスその他の防錆効果のある金属等の金属材料によって構成されており、特に中筒３２及び最内筒３３は前記材料で網目状に構成されている。さらに、触媒層Ｓを構成する触媒は、例えば、セラミック触媒、三元触媒等で構成すればよい。
【００２４】
上記触媒室３０において、この外筒３１は、前方円形側面３６ｆと、後方円形側面３６ｒと、円筒状の外周壁面３６ｐとからなり、前方円形側面３６ｆと後方円形側面３６ｒとが所定の長さＬとなるように配置されて、それら前方円形側面３６ｆと後方円形側面３６ｒの取付片３６fj，３６rjに外周壁面３６ｐが固定されることにより中空円筒に構成される。また、前記外筒３１の外周壁面３６ｐは、図５に示すように、２分割できるようにしてあり、容易に保守ができるようになっている。前記外筒３１の前方円形側面３６ｆには外筒３１の中心軸Ｃと同心状に取付管３７が設けられている。この取付管３７は、前方円形側面３６ｆの図示右側に一定の長さまで延長されるとともに、前方円形側面３６ｆの図示左側にも延長されている。
【００２５】
前記第２の外気導入手段４０は、前記外筒の前方側面３６ｆに外筒３１の中心軸Ｃと同心状に穿設配置された第２外気取入れ口４１，４１，…と、当該第２外気取入れ口４１，４１，…から取り入れた外気を触媒層Ｓ側に導くため取り付けられた一定長さの中空パイプ４２，４２，…と、当該中空パイプ４２，４２，…の各端部に固定されていて中空パイプ４２，４２，…の内径部分に相当する孔４３，４３，…が穿設されている円板４４と、前記中空パイプ４２，４２，…内に導かれた外気を、前記円板４４と中筒３２とが当接することによりできる空間４５によって触媒層Ｓに導くようにした外気通路４６とから構成されている。
【００２６】
なお、前記接続管２５からの排気ガス空気混合体を前記外筒３１と中筒３２の間に導くガス通路３４は、前記前方円形側面３６ｆの図示左側に中空パイプ４２，４２，…によって一定間隔を持たせて取り付けた前記円板４４と前記前方円形側面３６ｆとの間にできる空間によって構成されている。また、前記ガス通路３４には、前記円板４４の取付管３７の側の空間に外筒３１の中心軸Ｃに同心状に円錐体３８を設けており、排気ガスと空気の混合体が円滑に前記外筒３１と中筒３２の間に導けるようにしてある。
【００２７】
前記第３の外気導入手段５０は次のように構成されている。前記外筒３１の後方側面３６ｒとほぼ同じかやや大きな面積の円板状板体５１の中央部には、前記外筒３１の中心軸Ｃと同心状に、前記最内筒３３の筒寸法とほぼ同じ寸法に孔５２が設けられている。この板体５１には、当該孔５２に連通する筒体５３が一体構造で設けられている。前記板体５１は、前記外筒３１の後方側面３６ｒから一定間隔が保たれるように、後方側面３６ｒに垂設された取付けボルト５４，５４，…で取り付けてなり、前記外筒３１の後方側壁３６ｒと前記板体５１との間隙により第３外気取入れ口５５及び外気通路５６を形成している。また、上記板体５１の外周縁は、前記外筒３１の径よりやや大きくなっていて、図示左側に曲げられている。
【００２８】
このような車両用排気ガス浄化装置１１の作用を以下に説明する。
【００２９】
車両のエンジンにおいて燃料が燃焼されることにより生じる排気ガスは、排気系統９の後端部８（図６参照）から第１の外気導入手段２０の接続管２５に入いる。すると、第１の外気導入手段２０の接続管２５において、排気ガスは、他の通路２３ａ，２３ｂより径を細くした一部通路２２の部分を通過する際に、排気ガスの流速が高速になり圧力が低下するため、第１外気取入れ口２４，２４，２４，２４から外気を取り入れることになり（図示矢印）、当該排気ガスと外気とが混合攪拌されて、排気ガスの温度を低下させることになり、有害物質の無害化を促進させることになる。
【００３０】
また、通路２３ｂ、取付管３７を通った排ガス空気混合体は、前記ガス通路３４の円錐体３８により外側に円滑に曲げられて通過してゆき、前記外筒３１と中筒３２の間に導かれる。この際に、排気ガス中の煤などの重量の重い物質は、外筒３１の外周壁面３６ｐの内壁下部に蓄積されることになる。したがって、これら煤等は、外筒３１の外周壁面３６ｐを２分割することにより、容易に取り出すことができる。
【００３１】
前記外筒３１と中筒３２の間に導かれた排気ガス空気混合体は、図示矢印のように中筒３２と最内筒３３の間の触媒層Ｓを通過する際に触媒と接触し、この触媒によって酸化還元作用が促進されて排気ガスが浄化される。この際に、当該第２外気取入れ口から取り入れた外気を触媒層Ｓに導き（図示矢印参照）、高温の排気ガス空気混合体で温度が高くなった触媒層Ｓを冷却させる。これにより、当該触媒の寿命を長くすることができる。
【００３２】
また、前記最内筒３３の一端開放口３５から大気に向けて浄化後のガスを放出する（図示矢印）。このとき、前記一端開放口３５から出たガスの部分が負圧になるため、外筒３１の後方側壁３６ｒと板体５１との間隙でもって形成された第３外気取入れ口５５から外気を取り入れ（図示矢印参照）、この外気を通路５６を通して一端開放口３５から出た浄化後のガスに混合攪拌させてから、筒体５３を介して大気中へ放出させる。これにより、放出されるガス温度をさらに低下させて有害物質の無害化をより一層促進させている。
【００３３】
以上説明したように本実施の形態によれば、次のような利点がある。
（１）エンジンにおいて燃料が燃焼されることにより生じる排気ガスが排気系統を介して車両用排気ガス浄化装置に導入されると、触媒室３０の前段階における第１の外気導入手段２０により外気が取り入れられて排気ガスと攪拌混合されて排気ガスの温度を低下させるので、有害物質の無害化を促進させることができるとともに、触媒の寿命がながくなる。
（２）さらに、第２の外気導入手段４０から触媒室３０の触媒層Ｓに外気が取り入れられてさらに触媒層Ｓの温度を低下させるので、触媒の寿命がながくなる。
（３）また、触媒室３０の触媒層Ｓで浄化されたガスが、第３の外気導入手段により取り込まれた外気と混合攪拌されることにより、さらに、ガス温度を低下させて有害物質の無害化をさらに促進させることができる。
（４）加えて、前記第１の外気導入手段２０には、第１外気取入れ口の後方に永久磁石を配置してなるので、排気ガスが磁界中を直角に通過する際に磁気の影響を受けて、排気ガス中の磁気から影響を受ける成分の分離が促進される。
【００３４】
なお、上記実施の形態では、外筒３１等の外形形状を円筒形状で説明したが、これに限らず他の形状、例えば角柱状に構成してあってもよい。また、触媒層Ｓの触媒は、セラミック材料からなるものに限定されるものではなく、樹脂材料で構成したものであってもよい。
【００３５】
【発明の効果】
以上説明したように本発明によれば、次のような利点がある。
（１）エンジンにおいて燃料が燃焼されることにより生じる排気ガスが排気系統を介して車両用排気ガス浄化装置に導入されると、触媒室の前段階における第１の外気導入手段により外気が取り入れられて排気ガスと攪拌混合されて排気ガスの温度を低下させるので、有害物質の無害化を促進させることができるとともに、触媒の寿命がながくなる。
（２）さらに、第２の外気導入手段から触媒室の触媒層に外気が取り入れられてさらに触媒層の温度を低下させるので、触媒の寿命がながくなるとともに、有害物質の除去を促進させる。
（３）また、触媒室の触媒層で浄化されたガスが、第３の外気導入手段により取り込まれた外気と混合攪拌されることにより、さらに、ガス温度を低下させて有害物質の無害化をさらに促進させることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る浄化装置の全体構造を示す縦断面図である。
【図２】同浄化装置における第１の外気導入手段を構成する接続管の内部構造を示す側面図である。
【図３】同浄化装置における第１の外気導入手段を構成する接続管の要部を示す横断面図である。
【図４】同浄化装置における第１の外気導入手段を構成する接続機構の例を示す正面図である。
【図５】同浄化装置の外筒の構成状態を示す図である
【図６】従来の車両用排気ガス浄化装置の使用例を示す図である。
【符号の説明】
１０車両用排気ガス浄化装置
２０第１の外気導入手段
２１接続管
２２細くした一部通路
２３ａ，２３ｂ他の通路
２４第１外気取入れ口
２６，２７永久磁石
３０触媒室
３１外筒
３２中筒
３３最内筒
３４ガス通路
３６ｆ先方側面
３６ｒ後方側面
３６ｐ外周壁面
３７取付管
３８円錐体
４０第２の外気導入手段
４１第２外気取入れ口
４２中空パイプ
４４円板
５０第３の外気導入手段
５１板体
５３筒体
５５第３外気取入れ口[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust for a vehicle that is attached in the vicinity of an exhaust port of an exhaust system that releases exhaust gas discharged from a vehicle driving engine mounted on a vehicle to the atmosphere, and that is discharged into the atmosphere after purifying the exhaust gas. The present invention relates to an improvement of a gas purification device.
[0002]
[Prior art]
A vehicle such as this type of vehicle is known to be equipped with a gasoline engine or a diesel engine as a prime mover, and can move by burning fuel such as gasoline or light oil with the engine.
[0003]
FIG. 6 is a diagram showing a specific example of a vehicle to which a conventional vehicle exhaust gas purification device is connected. In FIG. 6, a vehicle 1 transmits exhaust gas discharged from the engine 2 to an exhaust system 9 including an exhaust manifold 3, a front exhaust tube 4, a catalyzer 5, a center exhaust tube 6, a muffler 7, and a rear end portion 8. A conventional vehicle exhaust gas purification device J is connected to the rear end portion 8, and the vehicle exhaust gas purification device J further purifies the exhaust gas. (See JP-A-11-62550).
[0004]
The above-described conventional vehicle exhaust gas purifying device J makes the exhaust gas taken in from the exhaust system 9 contact the catalyst and advances the purification of the exhaust gas, and then takes the outside air into the purified gas and mixes and stirs the gas. By reducing the temperature, harmful substances are made harmless.
[0005]
[Problems to be solved by the invention]
However, the conventional vehicle exhaust gas purification apparatus described above has a drawback that the catalyst life is shortened because the catalyst is exposed to high-temperature exhaust gas.
[0006]
Further, in the above conventional vehicle exhaust gas purification device, only the outside air is taken in and mixed with the exhaust gas after contacting the catalyst layer, so that harmful substances may be released to the atmosphere. In addition, there is a drawback that detoxification of harmful substances is not sufficiently performed.
[0007]
An object of the present invention is to provide a vehicle exhaust gas purifying device that eliminates the above-mentioned drawbacks of the conventional device, further promotes the detoxification of harmful substances, and extends the life of the catalyst.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an exhaust gas purifying apparatus for a vehicle according to the first aspect of the present invention provides an exhaust port of an exhaust system that discharges exhaust gas discharged from a vehicle driving engine mounted on the vehicle to the atmosphere. In a vehicle exhaust gas purification apparatus that is attached in the vicinity and purifies the exhaust gas and then releases it to the atmosphere, first outside air introduction means for taking in outside air at a stage of receiving the exhaust gas from the exhaust system, and the exhaust gas A catalyst chamber in which a mixed gas with outside air taken in from the first outside air introduction means is brought into contact with the catalyst layer to detoxify; and a second outside air is introduced into the catalyst layer in the catalyst chamber and brought into contact with the catalyst layer. At the stage of releasing the gas body from which harmful substances have been removed by the outside air introduction means and the catalyst layer of the catalyst chamber, the outside air is further taken in and mixed with the gas body to lower the temperature of the gas body. Those characterized by comprising providing a third outside air introduction means.
[0009]
Therefore, according to the first aspect of the present invention, when the exhaust gas generated by the combustion of the fuel in the engine is introduced into the vehicle exhaust gas purification device via the exhaust system, the first outside air introduction means performs the operation. Outside air is taken in and mixed with the exhaust gas to reduce the temperature of the exhaust gas and promote the detoxification of harmful substances. In addition, the outside air is taken in by the second outside air introduction means, the outside air is supplied to the catalyst layer in the catalyst chamber, and the catalyst layer is cooled, thereby extending the life. The gas purified by the catalyst layer in the catalyst chamber is further mixed and stirred with the outside air taken in by the third outside air introduction means, thereby further reducing the gas temperature and further promoting the detoxification of harmful substances. ing.
[0010]
According to a second aspect of the present invention, in the first aspect, the first outside air introducing means has a connection mechanism for connecting to the exhaust system, and the exhaust gas received from the exhaust system is disposed in the next stage. A part of the exhaust gas passage to be guided is made thinner than the other exhaust gas passages, and is composed of a connection pipe provided with a first outside air intake in the narrowed partial passage.
[0011]
According to a third aspect of the present invention, in the first aspect, the catalyst chamber is configured by an outer cylinder having a predetermined length and a mesh body that is housed in the outer cylinder and has a shorter length than the outer cylinder. An inner cylinder and an innermost cylinder, a catalyst layer accommodated between the inner cylinder and the innermost cylinder, and a gas passage for guiding an exhaust gas / air mixture from the connection pipe between the outer cylinder and the inner cylinder. Equipped with, to release the purified gas toward the atmosphere from one end opening of the innermost cylinder,
The second outside air introduction means includes a second outside air intake port provided in a front side wall of the outer cylinder, and a catalyst layer that stores outside air taken in from the second outside air inlet port between the middle cylinder and the innermost cylinder. It consists of an outside air passage that leads,
The third outside air introducing means is provided with a hole in the center of the plate having the same area as the rear side wall of the outer cylinder and having a dimension substantially the same as the cylinder dimension of the innermost cylinder, and the cylinder communicating with the hole is A third outside air intake port is formed by a gap between the rear side wall of the outer cylinder and the plate body by attaching the plate body to the rear side wall of the outer cylinder with a predetermined interval. It is a feature.
[0012]
According to a fourth aspect of the present invention, in the first aspect, the first outside air introduction means has a connection mechanism for connecting to the exhaust system, and the exhaust gas received from the exhaust system is placed in the next stage. A part of the exhaust gas passage to be guided is made thinner than the other exhaust gas passages, a first outside air intake port is provided in the narrowed partial passage, and behind the first outside air intake port of the narrowed partial passage It is characterized by arranging permanent magnets.
[0013]
In order to achieve the above object, an exhaust gas purifying apparatus for a vehicle according to claim 5 is an exhaust port of an exhaust system for releasing exhaust gas discharged from a vehicle driving engine mounted on the vehicle into the atmosphere. An exhaust gas purification apparatus for a vehicle, which is attached near and purifies the exhaust gas and then releases it to the atmosphere, has a connection mechanism for connecting to the exhaust system, and exhaust gas received from the exhaust system A part of the exhaust gas passage leading to the next stage is made thinner than the other exhaust gas passages, and a first outside air introducing means comprising a connecting pipe in which a first outside air intake port is provided in the narrowed part passage; The inner cylinder and the innermost cylinder, which are housed in an outer cylinder of a predetermined length and are configured by a mesh body having a shorter length than the outer cylinder, have a catalyst layer between the inner cylinder and the innermost cylinder The exhaust gas air mixture from the connecting pipe A gas passage leading between the outer cylinder and the middle cylinder; a catalyst chamber configured to discharge purified gas from one end opening of the innermost cylinder toward the atmosphere; and a front side wall of the outer cylinder Provided with a second outside air intake port, and provided with an outside air passage for guiding outside air taken in from the second outside air inlet port to a catalyst layer stored between the middle cylinder and the innermost cylinder, In the center of the plate having the same area as the rear side wall of the outer cylinder, a hole is provided in the same dimension as the cylinder of the innermost cylinder, a cylinder communicating with the hole is provided in the disk, and the plate is And a third outside air introduction means which is attached to the rear side wall of the outer cylinder with a certain interval and forms a third outside air intake port with a gap between the rear side wall of the outer cylinder and the plate body. It is characterized by that.
[0014]
Therefore, in the invention according to claim 5, the exhaust gas generated by the combustion of fuel in the engine enters the connecting pipe from the exhaust system and passes through a portion narrower than the other exhaust gas passages. Since the flow rate of the gas becomes high and the pressure decreases, the outside air is taken in from the first outside air intake, and the exhaust gas and the outside air are mixed and agitated to lower the temperature of the exhaust gas, thereby detoxifying harmful substances. It will be promoted. In addition, the exhaust gas / air mixture from the connection pipe is brought into contact with the catalyst layer housed between the middle cylinder and the innermost cylinder housed in the outer cylinder. The outside air taken from the intake port is guided to the catalyst layer, and the catalyst layer is cooled to extend the life of the catalyst. In addition, the purified gas is released from one end opening of the innermost cylinder toward the atmosphere, and at that time, a plate body attached to the rear side wall of the outer cylinder with a certain interval is provided. By taking outside air through the third outside air inlet formed with a gap, mixing and stirring with the purified gas, and then releasing it into the atmosphere, the temperature of the released gas can be further lowered to detoxify harmful substances. It is further promoted.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
1 to 6 are views for explaining a vehicle exhaust gas purifying apparatus according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing the entire structure of the purification device. FIG. 2 is a side view showing the internal structure of the connecting pipe constituting the first outside air introducing means in the purification apparatus. FIG. 3 is a cross-sectional view showing the main part of the connecting pipe constituting the first outside air introducing means in the purification device. FIG. 4 is a front view showing an example of a connection mechanism constituting the first outside air introducing means in the purification device. FIG. 5 is a view showing a configuration state of an outer cylinder of the purification device.
[0017]
The vehicle exhaust gas purification device 10 according to the embodiment of the present invention shown in FIG. 1 is used by being attached to the rear end portion 8 of the exhaust system 9 in the same manner as the conventional vehicle exhaust gas purification device J. Yes, exhaust gas generated by the combustion of fuel in the engine 2 can be purified and released into the atmosphere (see FIG. 6).
[0018]
1 to 3, the vehicle exhaust gas purification device 10 is roughly divided into a first outside air introduction means 20 for taking in outside air at a stage of receiving exhaust gas from the exhaust system, the exhaust gas and the first exhaust gas. A catalyst chamber 30 in which a mixed gas with outside air taken in from the outside air introduction means 20 is brought into contact with the catalyst layer S to make it harmless, and a new outside air is introduced into the catalyst layer S of the catalyst chamber 30 and brought into contact with the catalyst layer. The outside air is taken in and mixed with the gas body at the stage of releasing the gas body from which harmful substances have been removed in the outside air introduction means 40 and the catalyst layer S of the catalyst chamber 30 to the atmosphere, and the temperature of the gas body is adjusted. And a third outside air introduction means 50 for lowering.
[0019]
More specifically, the first outside air introduction means 20 includes, as shown in FIGS. 1 to 4, a connection mechanism 21 for connecting to the rear end 8 (see FIG. 6) of the exhaust system 9, A portion 22 of the exhaust gas passage that guides the exhaust gas received from the exhaust system 9 to the next stage is made narrower than the other exhaust gas passages 23, and the first outside air inlets 24, 24, The connecting pipe 25 is provided with 24 and 24. Further, as shown in FIGS. 1 and 3, the first outside air introduction means 20 has polarities in the axial direction behind the first outside air intake ports 24, 24, 24, 24 of the narrowed partial passage 22. The permanent magnets 26 and 27 are arranged so that they face each other.
[0020]
Further, as shown in FIG. 4, the connection mechanism 21 described above is provided with bolt holes at both end portions 21b of a substantially Ω-shaped metal fitting 21a, and both end portions 21b and 21b of the two substantially Ω-shaped metal fittings 21a. , 21b, 21b, and after inserting the bolt 21c into the both end portions 21b, 21b, the nut 21d is screwed into the bolt 21c, and tightened with the bolt 21c and nut 21d according to the attached state.
[0021]
A connection mechanism 28 is also provided on the rear side of the connection pipe 25, and the catalyst chamber 30 can be attached and fixed to the connection pipe 25 by this connection mechanism 28. Of course, the connection mechanism 28 has the same configuration as the connection mechanism 21.
[0022]
Further, as shown in FIG. 1, the connecting pipe 25 has a diameter smaller than that of the other exhaust gas passage 23 a having a slightly larger diameter than the rear end portion 8 (see FIG. 6) of the exhaust system 9. It consists of a part of the passage 22 and a part of the exhaust gas passage 23b having the same diameter as the exhaust gas passage 23a, and an inclined surface having a predetermined angle is formed between these parts so as not to cause a vortex in the exhaust gas flow. It has become.
[0023]
The catalyst chamber 30 includes an outer cylinder 31 having a predetermined length L and an inner cylinder 32 and an innermost cylinder 33 that are housed in the outer cylinder 31 and are configured by a mesh body having a shorter length than the outer cylinder 31. A catalyst layer S accommodated between the middle cylinder 32 and the innermost cylinder 33, and a gas passage 34 for guiding the exhaust gas / air mixture from the connecting pipe 25 between the outer cylinder 31 and the middle cylinder 32. The purified gas is discharged from one end opening 35 of the innermost cylinder 33 toward the atmosphere. The outer cylinder 31, the middle cylinder 32, and the innermost cylinder 33 are made of a metal material such as stainless steel or other metal having an anticorrosive effect. In particular, the inner cylinder 32 and the innermost cylinder 33 are meshed with the above materials. It is configured. Furthermore, the catalyst constituting the catalyst layer S may be composed of, for example, a ceramic catalyst or a three-way catalyst.
[0024]
In the catalyst chamber 30, the outer cylinder 31 includes a front circular side surface 36f, a rear circular side surface 36r, and a cylindrical outer peripheral wall surface 36p. The front circular side surface 36f and the rear circular side surface 36r have a predetermined length L. The outer peripheral wall surface 36p is fixed to the attachment pieces 36fj and 36rj of the front circular side surface 36f and the rear circular side surface 36r, thereby forming a hollow cylinder. Further, as shown in FIG. 5, the outer peripheral wall surface 36p of the outer cylinder 31 can be divided into two parts and can be easily maintained. A mounting pipe 37 is provided concentrically with the central axis C of the outer cylinder 31 on the front circular side surface 36 f of the outer cylinder 31. The attachment pipe 37 extends to the right side of the front circular side surface 36f in the drawing to a certain length, and also extends to the left side of the front circular side surface 36f in the drawing.
[0025]
The second outside air introduction means 40 includes second outside air intake ports 41, 41,... That are formed on the front side surface 36f of the outer cylinder so as to be formed concentrically with the center axis C of the outer cylinder 31, and the second outside air. Are fixed to the end portions of the hollow pipes 42, 42,... Of fixed lengths attached to guide the outside air taken in from the intake ports 41, 41,. .., And a circular plate 44 having holes 43, 43,... Corresponding to the inner diameter portions of the hollow pipes 42, 42,..., And outside air guided into the hollow pipes 42, 42,. It is composed of an outside air passage 46 that is guided to the catalyst layer S by a space 45 that is formed by the plate 44 and the middle cylinder 32 coming into contact with each other.
[0026]
A gas passage 34 that guides the exhaust gas / air mixture from the connection pipe 25 between the outer cylinder 31 and the middle cylinder 32 is spaced by a hollow pipe 42, 42,. It is comprised by the space formed between the said disk 44 and the said front circular side surface 36f which gave and attached. The gas passage 34 is provided with a conical body 38 concentrically with the central axis C of the outer cylinder 31 in the space on the side of the mounting tube 37 of the disk 44 so that a mixture of exhaust gas and air is smooth. It can be led between the outer cylinder 31 and the middle cylinder 32.
[0027]
The third outside air introducing means 50 is configured as follows. The central dimension of the inner cylinder 33 is concentric with the central axis C of the outer cylinder 31 at the center of the disc-like plate body 51 having the same or slightly larger area as the rear side surface 36r of the outer cylinder 31. Holes 52 are provided with approximately the same dimensions. The plate body 51 is provided with a cylindrical body 53 that communicates with the hole 52 in an integral structure. The plate body 51 is attached with mounting bolts 54, 54,... Suspended from the rear side surface 36r so as to be kept at a constant distance from the rear side surface 36r of the outer cylinder 31. A third outside air intake 55 and an outside air passage 56 are formed by a gap between the side wall 36 r and the plate body 51. Further, the outer peripheral edge of the plate body 51 is slightly larger than the diameter of the outer cylinder 31, and is bent to the left in the figure.
[0028]
The operation of the vehicle exhaust gas purification device 11 will be described below.
[0029]
Exhaust gas generated by the combustion of fuel in the vehicle engine enters the connection pipe 25 of the first outside air introduction means 20 from the rear end portion 8 (see FIG. 6) of the exhaust system 9. Then, in the connecting pipe 25 of the first outside air introduction means 20, when the exhaust gas passes through the portion of the partial passage 22 whose diameter is smaller than that of the other passages 23a and 23b, the flow rate of the exhaust gas becomes high. Since the pressure decreases, the outside air is taken in from the first outside air inlets 24, 24, 24, 24 (shown by arrows), and the exhaust gas and the outside air are mixed and stirred to lower the temperature of the exhaust gas. This will promote the detoxification of harmful substances.
[0030]
The exhaust gas / air mixture that has passed through the passage 23b and the attachment pipe 37 is smoothly bent outward by the cone 38 of the gas passage 34 and passes between the outer cylinder 31 and the middle cylinder 32. It is burned. At this time, a heavy substance such as soot in the exhaust gas is accumulated in the lower part of the inner wall of the outer peripheral wall surface 36 p of the outer cylinder 31. Therefore, these scissors can be easily taken out by dividing the outer peripheral wall surface 36p of the outer cylinder 31 into two parts.
[0031]
The exhaust gas / air mixture guided between the outer cylinder 31 and the middle cylinder 32 comes into contact with the catalyst when passing through the catalyst layer S between the middle cylinder 32 and the innermost cylinder 33 as shown in the figure, This catalyst promotes the redox action and purifies the exhaust gas. At this time, the outside air taken in from the second outside air inlet is guided to the catalyst layer S (see the arrow in the figure), and the catalyst layer S whose temperature has been increased by the high-temperature exhaust gas / air mixture is cooled. Thereby, the lifetime of the said catalyst can be lengthened.
[0032]
Further, the purified gas is released from the one end opening 35 of the innermost cylinder 33 toward the atmosphere (arrow shown). At this time, since the portion of the gas exiting from the one end opening 35 becomes negative pressure, outside air is taken in from the third outside air intake 55 formed by the gap between the rear side wall 36r of the outer cylinder 31 and the plate body 51. (Refer to the arrow in the figure.) The outside air is mixed and agitated with the purified gas discharged from the one end opening 35 through the passage 56 and then released into the atmosphere via the cylinder 53. As a result, the temperature of the released gas is further lowered to further promote the detoxification of harmful substances.
[0033]
As described above, the present embodiment has the following advantages.
(1) When exhaust gas generated by combustion of fuel in the engine is introduced into the vehicle exhaust gas purification device via the exhaust system, the outside air is introduced by the first outside air introduction means 20 in the previous stage of the catalyst chamber 30. Since it is taken in and mixed with exhaust gas to lower the temperature of the exhaust gas, detoxification of harmful substances can be promoted and the life of the catalyst is shortened.
(2) Further, since the outside air is taken into the catalyst layer S of the catalyst chamber 30 from the second outside air introduction means 40 and the temperature of the catalyst layer S is further lowered, the life of the catalyst is shortened.
(3) Further, the gas purified by the catalyst layer S in the catalyst chamber 30 is mixed and stirred with the outside air taken in by the third outside air introducing means, thereby further reducing the gas temperature and harming harmful substances. Can be further promoted.
(4) In addition, since the first outside air introduction means 20 is provided with a permanent magnet behind the first outside air intake port, the influence of magnetism is exerted when the exhaust gas passes through the magnetic field at a right angle. In response, the separation of components affected by magnetism in the exhaust gas is promoted.
[0034]
In the above-described embodiment, the outer shape of the outer cylinder 31 and the like has been described as a cylindrical shape. However, the outer shape is not limited thereto, and may be configured in another shape, for example, a prism shape. Further, the catalyst of the catalyst layer S is not limited to one made of a ceramic material, and may be one made of a resin material.
[0035]
【The invention's effect】
As described above, the present invention has the following advantages.
(1) When exhaust gas generated by combustion of fuel in the engine is introduced into the vehicle exhaust gas purification device via the exhaust system, outside air is taken in by the first outside air introduction means in the previous stage of the catalyst chamber. Since the temperature of the exhaust gas is lowered by stirring and mixing with the exhaust gas, detoxification of harmful substances can be promoted and the life of the catalyst is shortened.
(2) Furthermore, since the outside air is taken into the catalyst layer in the catalyst chamber from the second outside air introduction means and the temperature of the catalyst layer is further lowered, the life of the catalyst is shortened and the removal of harmful substances is promoted.
(3) Further, the gas purified in the catalyst layer of the catalyst chamber is mixed and stirred with the outside air taken in by the third outside air introducing means, thereby further reducing the gas temperature and detoxifying harmful substances. It can be further promoted.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the overall structure of a purification device according to an embodiment of the present invention.
FIG. 2 is a side view showing an internal structure of a connecting pipe constituting first outside air introduction means in the purification device.
FIG. 3 is a cross-sectional view showing a main part of a connecting pipe constituting the first outside air introducing means in the purification device.
FIG. 4 is a front view showing an example of a connection mechanism constituting the first outside air introducing means in the purification device.
FIG. 5 is a view showing a configuration state of an outer cylinder of the purification device. FIG. 6 is a view showing an example of use of a conventional vehicle exhaust gas purification device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Exhaust gas purification apparatus 20 for vehicles 1st external air introduction means 21 Connection pipe 22 Partial passages 23a and 23b which were narrowed Other passages 24 First external air intake ports 26 and 27 Permanent magnet 30 Catalyst chamber 31 Outer cylinder 32 Middle cylinder 33 Inner cylinder 34 Gas passage 36f Front side surface 36r Rear side surface 36p Outer peripheral wall surface 37 Mounting pipe 38 Conical body 40 Second outside air introduction means 41 Second outside air intake port 42 Hollow pipe 44 Disc 50 Third outside air introduction means 51 Plate body 53 Cylinder 55 Third outside air intake

Claims

In a vehicle exhaust gas purification apparatus that is mounted near an exhaust port of an exhaust system that releases exhaust gas discharged from a vehicle driving engine mounted on a vehicle to the atmosphere, and that exhausts the exhaust gas into the atmosphere after purifying the exhaust gas ,
First outside air introduction means for taking in outside air at the stage of receiving exhaust gas from the exhaust system;
A catalyst chamber for detoxifying the mixed gas of the exhaust gas and the outside air taken in from the first outside air introducing means by contacting the catalyst layer;
Second outside air introduction means for introducing new outside air into the catalyst layer of the catalyst chamber and bringing it into contact with the catalyst layer;
A third outside air introduction means for further taking in outside air and mixing it with the gas body at the stage of releasing the gas body from which harmful substances have been removed in the catalyst layer of the catalyst chamber into the atmosphere, and reducing the temperature of the gas body; set only becomes, the
The catalyst chamber includes an outer cylinder having a predetermined length, a middle cylinder and an innermost cylinder that are housed in the outer cylinder and are shorter than the outer cylinder, and an inner cylinder and an inner cylinder. A catalyst layer housed between the inner cylinder and a gas passage for guiding the exhaust gas / air mixture from the connecting pipe between the outer cylinder and the middle cylinder; The second outside air introduction means is configured to release the purified gas toward the second outside air intake port provided on the front side wall of the outer cylinder and the outside air taken in from the second outside air intake port. It consists of an outside air passage that leads to the catalyst layer stored between the middle cylinder and the innermost cylinder,
The third outside air introducing means is provided with a hole in the center of the plate having substantially the same area as the rear side wall of the outer cylinder and having a dimension substantially the same as the cylinder dimension of the innermost cylinder, and the cylinder communicating with the hole is formed in the circle. A third outside air intake port is formed by a gap between the rear side wall of the outer cylinder and the plate body by attaching the plate body to the rear side wall of the outer cylinder with a constant interval. An exhaust gas purifying device for vehicles.

The first outside air introduction means has a connection mechanism for connecting to the exhaust system, and a part of the exhaust gas passage for guiding the exhaust gas received from the exhaust system to the next stage is connected to another exhaust gas. 2. The exhaust gas purifying apparatus for a vehicle according to claim 1, comprising a connecting pipe that is narrower than the passage and is provided with a first outside air inlet in the narrowed partial passage.

The first outside air introduction means has a connection mechanism for connecting to the exhaust system, and a part of the exhaust gas passage for guiding the exhaust gas received from the exhaust system to the next stage is connected to another exhaust gas. It is narrower than the passage, and a first outside air intake is provided in the narrowed partial passage, and a permanent magnet is disposed behind the first outside air intake of the thinned partial passage. The exhaust gas purification device for a vehicle according to claim 1.

In a vehicle exhaust gas purification apparatus that is mounted near an exhaust port of an exhaust system that releases exhaust gas discharged from a vehicle driving engine mounted on a vehicle to the atmosphere, and that exhausts the exhaust gas into the atmosphere after purifying the exhaust gas ,
It has a connection mechanism for connecting to the exhaust system, and a part of the exhaust gas passage for guiding the exhaust gas received from the exhaust system to the next stage is made thinner than the other exhaust gas passages, and is made narrower A first outside air introducing means comprising a connecting pipe provided with a first outside air intake in a partial passage;
The inner cylinder and the innermost cylinder, which are housed in an outer cylinder of a predetermined length and are configured by a mesh body having a shorter length than the outer cylinder, have a catalyst layer between the inner cylinder and the innermost cylinder A gas passage that guides the exhaust gas / air mixture from the connecting pipe between the outer cylinder and the middle cylinder, and discharges purified gas from one end opening of the innermost cylinder toward the atmosphere. A catalyst chamber,
A second outside air inlet is provided in the front side wall of the outer cylinder, and a second outside air passage is provided for guiding the outside air taken in from the second outside air inlet to the catalyst layer housed between the middle cylinder and the innermost cylinder. Outside air introduction means,
A hole is provided in the center of the plate having substantially the same area as the rear side wall of the outer cylinder, approximately the same as the cylinder size of the innermost cylinder, a cylinder communicating with the hole is provided in the disk, and the plate is And a third outside air introduction means which is attached to the rear side wall of the outer cylinder with a predetermined interval and forms a third outside air intake port with a gap between the rear side wall of the outer cylinder and the plate body. An exhaust gas purifying device for a vehicle characterized by the above.