JPH06146871A - Catalytic converter for exhaust emission control - Google Patents
Catalytic converter for exhaust emission controlInfo
- Publication number
- JPH06146871A JPH06146871A JP4316463A JP31646392A JPH06146871A JP H06146871 A JPH06146871 A JP H06146871A JP 4316463 A JP4316463 A JP 4316463A JP 31646392 A JP31646392 A JP 31646392A JP H06146871 A JPH06146871 A JP H06146871A
- Authority
- JP
- Japan
- Prior art keywords
- catalytic converter
- sheet material
- plate material
- upstream side
- flat plate
- 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.)
- Pending
Links
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 26
- 238000000746 purification Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 91
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 230000004913 activation Effects 0.000 abstract description 8
- 238000006555 catalytic reaction Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 27
- 239000003054 catalyst Substances 0.000 description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
- Treating Waste Gases (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，エンジンから排出され
る排気ガスを浄化するための，触媒コンバータ，特にそ
の通電加熱手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic converter for purifying exhaust gas discharged from an engine, and more particularly to an electric heating means for the catalytic converter.
【０００２】[0002]
【従来技術】自動車のエンジンから排気される排気ガス
は，その中に少量ではあるが，ＮＯ，ＣＯ，ＨＣ等の有
害成分を含んでいる。そのため，これら有害成分を
Ｎ2 ，ＣＯ2 ，Ｈ2 Ｏ等の無害物質に浄化するため，従
来より，触媒コンバータが用いられている。2. Description of the Related Art Exhaust gas emitted from an engine of an automobile contains harmful components such as NO, CO, and HC, though in a small amount. Therefore, in order to purify these harmful components into harmless substances such as N 2 , CO 2 and H 2 O, a catalytic converter has been conventionally used.
【０００３】また，エンジンの始動直後においては，排
気ガスが低温であるために主モノリス触媒が，活性化温
度に達しない。そのため，これを補うために主モノリス
触媒の上流側に加熱式の触媒コンバータを配置すること
が提案されている。この方式では，触媒コンバータ全体
を強制的に電気加熱して，触媒を活性化させている（特
開平２−２２３６２２号公報，特開平３−１９３１４１
号公報）。Immediately after starting the engine, the main monolith catalyst does not reach the activation temperature because the exhaust gas has a low temperature. Therefore, in order to compensate for this, it has been proposed to arrange a heating type catalytic converter upstream of the main monolith catalyst. In this method, the entire catalytic converter is forcibly electrically heated to activate the catalyst (JP-A-2-223622 and JP-A-3-193141).
Issue).
【０００４】[0004]
【解決しようとする課題】しかしながら，上記従来の通
電加熱式触媒コンバータは，その触媒担体を構成する金
属構造体全体に通電を行ない，全体を一様に発熱，昇温
させるものである。そのため，触媒コンバータを短時間
に昇温させ，排気ガスを浄化させるためには，短時間に
非常に高い電力を供給する必要がある。本発明はかかる
従来の問題点に鑑み，低電力で，全体を短時間に触媒活
性化温度まで昇温でき，高い浄化性能を発揮することが
できる，排気ガス浄化用触媒コンバータを提供しようと
するものである。However, in the above-described conventional electric heating type catalytic converter, the entire metal structure constituting the catalyst carrier is energized to uniformly generate heat and raise the temperature. Therefore, in order to raise the temperature of the catalytic converter in a short time and purify the exhaust gas, it is necessary to supply a very high electric power in a short time. In view of such conventional problems, the present invention intends to provide an exhaust gas purifying catalytic converter capable of raising the entire temperature to a catalyst activation temperature in a short time and exhibiting high purifying performance with low electric power. It is a thing.
【０００５】[0005]
【課題の解決手段】本発明は，エンジンの排気ガス浄化
用の触媒コンバータであって，該触媒コンバータは連続
して折曲成形された金属製の波板材と，平坦な帯状をな
す金属製の平板材とを交互に重ねてガス流路を形成して
なる本体と，該本体の外周に設けた外筒とよりなり，上
記波板材は，排気ガスの上流側において，その幅方向の
端縁近くに波板材の長手方向に沿った貫通穴を有すると
共に，該貫通穴と上記端縁との間に電流通路を形成して
おり，また，波板材と平板材との対面部分には，上記電
流通路よりも内側に電気絶縁層を有し，かつ，上記上流
側における波板材の端縁と平板材の端縁とはその全部又
は一部が接合されて接合領域部を形成し，上記接合領域
部と上記外筒との間には上記上流側を加熱するための加
熱用電源を介設したことを特徴とする排気ガス浄化用触
媒コンバータにある。SUMMARY OF THE INVENTION The present invention is a catalytic converter for purifying exhaust gas of an engine, wherein the catalytic converter is made of a continuously bent metal corrugated sheet material and a flat strip-shaped metallic material. The corrugated sheet material is composed of a main body formed by alternately stacking flat plate materials to form a gas flow path, and an outer cylinder provided on the outer periphery of the main body. A through hole along the longitudinal direction of the corrugated sheet material is provided nearby, and a current path is formed between the through hole and the edge, and the facing portion between the corrugated sheet material and the flat sheet material has the above-mentioned An electrical insulating layer is provided inside the current passage, and the edges of the corrugated sheet material and the edges of the flat sheet material on the upstream side are wholly or partially joined to form a joining area portion, and the joining portion is formed. A heating power source for heating the upstream side is provided between the region and the outer cylinder. In a catalytic converter for purifying exhaust gases, characterized in that.
【０００６】本発明において，最も注目すべきことは，
波板材と平板材とにより構成した触媒コンバータの上流
側において，幅方向の端縁近くに波板材に対して上記貫
通穴及び電流通路を形成し，また該電流通路よりも内側
には波板材と平板材との間を絶縁する電気絶縁層を設
け，また波板材と平板材の上記端縁はその全部又は一部
を電気的に接合して，加熱用の接合領域部を形成したこ
とである。The most remarkable thing in the present invention is that
On the upstream side of the catalytic converter composed of the corrugated sheet material and the flat sheet material, the through hole and the current passage are formed in the corrugated sheet material near the end in the width direction, and the corrugated sheet material is formed inside the current passage. An electric insulation layer is provided to insulate the flat plate material from each other, and the edges of the corrugated plate material and the flat plate material are electrically joined in whole or in part to form a joint area for heating. .
【０００７】上記波板材は，例えばステンレス鋼により
凹凸状に成形された金属板等を用いる。一方，平板材
は，平坦状で，例えばステンレス鋼を用いた金属板等を
用いる。上記電気絶縁層は，上記波板材と平板材との間
に形成するが，アルミナ粉末，ジルコニア粉末等の絶縁
粉末を平板材の表面に焼付けることにより形成すること
が好ましい。これにより，電気絶縁層の形成が容易であ
る。As the corrugated plate material, for example, a metal plate or the like formed of stainless steel in an uneven shape is used. On the other hand, as the flat plate material, a flat metal plate made of, for example, stainless steel is used. The electrical insulating layer is formed between the corrugated plate material and the flat plate material, but is preferably formed by baking an insulating powder such as alumina powder or zirconia powder on the surface of the flat plate material. This facilitates the formation of the electrically insulating layer.
【０００８】上記絶縁粉末の焼付けは，上記平板材上に
アルミナスラリー，アルミナゾル等の絶縁材料を塗布
し，高温で加熱焼付けることにより行う。また，上記電
気絶縁層は，両者の間に空隙部を設けることによっても
形成できる。かかる空隙部は，波板材と平板材とを巻回
する際には，両者間に紙を介在させておき，巻回後この
紙を加熱焼失させることによっても形成できる。The insulating powder is baked by applying an insulating material such as alumina slurry or alumina sol on the flat plate material and baking it at a high temperature. The electric insulating layer can also be formed by providing a space between the two. Such a void portion can be formed by interposing a paper between the corrugated plate material and the flat plate material when they are wound, and heating and burning the paper after winding.
【０００９】上記波板材と平板材とは，例えば，交互に
重ねて巻回することによりハニカム状（図１）とする。
これにより，両者の間に排気ガスのガス流路が形成され
る。波板材と平板材とは，触媒担体であり，ガス流路に
面する表面には，排気ガス浄化用の触媒が担持される。
波板材と平板材とにより形成された本体には，その外周
に，ガス流路に沿った外筒を設ける。The corrugated plate material and the flat plate material are formed into a honeycomb shape (FIG. 1) by alternately winding them.
As a result, a gas flow path for exhaust gas is formed between the two. The corrugated plate material and the flat plate material are catalyst carriers, and a catalyst for purifying exhaust gas is carried on the surface facing the gas flow path.
An outer cylinder along the gas flow path is provided on the outer periphery of the main body formed of the corrugated plate material and the flat plate material.
【００１０】また，波板材には，排気ガスの上流側にお
いて，その幅方向の端縁近くに貫通穴を設ける。該貫通
穴と波板材の端縁との間には，加熱用電流を流すための
電流通路を形成する。貫通穴は，波板材の長手方向に沿
って，間欠的に設ける（図１）。上記電流通路の幅，即
ち貫通穴と波板材の端縁との間の間隔は，０．１〜０．
５ｍｍ設けることが好ましい。０．１ｍｍ未満では加熱
時溶損の問題があり，一方０．５ｍｍを越えると加熱時
の昇温速度が鈍るという問題を生ずるおそれがある。Further, the corrugated sheet material is provided with a through hole on the upstream side of the exhaust gas near the widthwise end edge thereof. A current path for passing a heating current is formed between the through hole and the edge of the corrugated sheet material. The through holes are provided intermittently along the longitudinal direction of the corrugated sheet material (Fig. 1). The width of the current passage, that is, the distance between the through hole and the edge of the corrugated sheet material is 0.1 to 0.
It is preferable to provide 5 mm. If it is less than 0.1 mm, there is a problem of melting loss during heating, while if it exceeds 0.5 mm, there is a possibility that there is a problem that the rate of temperature rise during heating is slow.
【００１１】上記電流通路よりも内側，即ち下流側に
は，波板材と平板材との間を電気的に絶縁する，前記電
気絶縁層を設ける。また，上記上流側においては，波板
材及び平板材の端縁が互いに電気的に接続されて接合領
域部を形成している。該接合領域部は，上流側の全面で
あっても，例えば十文字状等の一部分（図１，図８）で
あっても良く，触媒コンバータにおける所望加熱状態に
応じて形成する。On the inner side of the current passage, that is, on the downstream side, the electric insulating layer for electrically insulating the corrugated plate material and the flat plate material is provided. Further, on the upstream side, the edges of the corrugated sheet material and the flat sheet material are electrically connected to each other to form a joint area portion. The bonding region may be the entire surface on the upstream side or a part (for example, a cross shape) (FIGS. 1 and 8), and is formed according to a desired heating state in the catalytic converter.
【００１２】上記接合領域部と上記外筒との間には，上
記電流通路に加熱用電流を通ずるための加熱用電源を介
設する。また，上記接合領域部形成における接合は，波
板材又は平板材のいずれか一方に小突起を設け（図６，
図１１），該小突起を介して両者を接合することが好ま
しい。A heating power source for passing a heating current through the current passage is provided between the joining region and the outer cylinder. In addition, in the joining in forming the joining region portion, a small protrusion is provided on either one of the corrugated plate material and the flat plate material (see FIG.
11), it is preferable to join the two via the small protrusions.
【００１３】これにより，両者の接触面積を大きくする
ことができ，両者の電気的接合が容易になる。また，エ
ンジン振動に対する耐震性，厳しい冷熱サイクルに対す
る接合耐久性が向上する。また，接合領域部における接
合は，放電溶接，レーザ溶接，ろう付け等により行う。
上記のごとく構成した触媒コンバータは，エンジンの排
気ガス通路に配設する。As a result, the contact area between the two can be increased, and the electrical connection between the two becomes easy. In addition, the seismic resistance against engine vibration and the joining durability against severe cooling and heating cycles are improved. Also, the joining in the joining region is performed by discharge welding, laser welding, brazing, or the like.
The catalytic converter constructed as described above is arranged in the exhaust gas passage of the engine.
【００１４】[0014]
【作用及び効果】本発明の触媒コンバータにおいては，
エンジン始動と同時に接合領域部と外筒との間に加熱用
電流を印加する。また，エンジン始動と共にその排気ガ
スが触媒コンバータに流入する。そして，上記電流は接
合領域部において波板材と平板材を通って流れる。ここ
に，波板材においては，上記貫通穴と端縁との間に電流
通路が設けられ，該電流通路の内側は平板材との間に電
気絶縁層が設けてある。それ故，波板材においては電流
は電流通路のみを流れる。[Operation and effect] In the catalytic converter of the present invention,
Simultaneously with engine startup, a heating current is applied between the joining region and the outer cylinder. Moreover, the exhaust gas flows into the catalytic converter when the engine is started. Then, the current flows through the corrugated sheet material and the flat sheet material in the joining region. Here, in the corrugated sheet material, a current passage is provided between the through hole and the edge, and an electric insulating layer is provided inside the current passage and between the flat sheet material. Therefore, in the corrugated sheet material, the current flows only in the current path.
【００１５】そのため，電流通路における電流密度が高
くなり，この部分が局所的に昇温する。それ故，触媒コ
ンバータの上流側が早期に触媒活性化温度に到達し，更
に触媒反応熱によって昇温する。その結果，下流側は，
上流側の熱によって次々と短時間に加熱され，更に上記
上流側と同様に触媒反応熱によっても加熱され昇温す
る。Therefore, the current density in the current path becomes high, and the temperature of this portion locally rises. Therefore, the upstream side of the catalytic converter reaches the catalyst activation temperature early and is further heated by the heat of catalytic reaction. As a result, on the downstream side,
The heat on the upstream side successively heats it in a short time, and further, it heats up by the heat of the catalytic reaction as well as the heat on the upstream side to raise the temperature.
【００１６】したがって，触媒コンバータ全体を短時間
に触媒活性化温度まで昇温することができる。また，そ
のため，エンジン始動時より，早期に優れた排気ガス浄
化能力を発揮することができる。また，上記の加熱用電
流は，貫通穴と端縁との間の狭い電流通路に流すのみで
良いため，低電力で済む。以上のごとく，本発明によれ
ば，低電力で全体を短時間に触媒活性化温度まで昇温す
ることができ，高い浄化性能を発揮することができる，
排気ガス浄化用触媒コンバータを提供することができ
る。Therefore, the entire catalytic converter can be heated to the catalyst activation temperature in a short time. Therefore, it is possible to exert an excellent exhaust gas purifying ability earlier than when the engine is started. Further, the heating current described above only needs to be passed through a narrow current path between the through hole and the edge, so that low power is required. As described above, according to the present invention, it is possible to raise the temperature of the whole to the catalyst activation temperature in a short time with low electric power, and it is possible to exhibit high purification performance.
It is possible to provide a catalytic converter for purifying exhaust gas.
【００１７】[0017]
実施例１ 本発明の実施例にかかる排気ガス浄化用触媒コンバータ
につき，図１〜図５を用いて説明する。本例の触媒コン
バータ１００は，図１に示すごとく，凹凸状に連続して
折曲成形された金属製の波板材１と，平坦な帯状をなす
金属製の平板材２とを交互に重ねて，ガス流路２０を形
成した本体１０と，該本体１０の外周に設けた外筒３と
を有する。Example 1 An exhaust gas purifying catalytic converter according to an example of the present invention will be described with reference to FIGS. As shown in FIG. 1, the catalytic converter 100 of this example has a corrugated sheet material 1 made of metal and continuously bent in a concavo-convex shape, and a flat sheet material 2 made of metal in the form of a flat strip, which are alternately stacked. A main body 10 having a gas flow path 20 and an outer cylinder 3 provided on the outer periphery of the main body 10 are provided.
【００１８】また，図１〜図３に示すごとく，上記波板
材１は，排気ガスの上流側２０１において，その幅方向
の端縁１１の近くに，波板材１の長手方向に沿った貫通
穴１２を有する。また，該貫通穴１２と上記端縁１１と
の間に電流通路１４（図３）を形成している。上記波板
材１と平板材２との対面部分には，図２，図３に示すご
とく，上記電流通路１４よりも内側に電気絶縁層２５を
有する。Further, as shown in FIGS. 1 to 3, the corrugated sheet material 1 has a through hole along the longitudinal direction of the corrugated sheet material 1 on the upstream side 201 of the exhaust gas, near the end edge 11 in the width direction thereof. Have twelve. A current passage 14 (FIG. 3) is formed between the through hole 12 and the end edge 11. As shown in FIGS. 2 and 3, an electrical insulating layer 25 is provided inside the current passage 14 at a portion where the corrugated plate material 1 and the flat plate material 2 face each other.
【００１９】また，上記上流側２０１における波板材１
の端縁１１と平板材２の端縁２１とは，その一部が接合
された接合領域部４を形成している（図１の十文字状部
分）。上記接合領域部４と上記外筒３との間には，上記
上流側２０１を加熱するための加熱用電源４５を介設し
てある。Also, the corrugated sheet material 1 on the upstream side 201
The edge 11 and the edge 21 of the flat plate material 2 form a joint area portion 4 in which a part of them is joined (a cross-shaped portion in FIG. 1). A heating power supply 45 for heating the upstream side 201 is provided between the joining region portion 4 and the outer cylinder 3.
【００２０】以下，これを詳しく説明する。上記波板材
１は，厚み約０．０５ｍｍのステンレス鋼板により作製
されており，その端縁１１の近くに貫通穴１２を有す
る。この貫通穴１２は１．５×１．５ｍｍの小孔であ
る。貫通穴１２と端縁１１との間には，幅０．５ｍｍの
電流通路１４が形成されている。This will be described in detail below. The corrugated plate material 1 is made of a stainless steel plate having a thickness of about 0.05 mm, and has a through hole 12 near the edge 11. This through hole 12 is a small hole of 1.5 × 1.5 mm. A current passage 14 having a width of 0.5 mm is formed between the through hole 12 and the end edge 11.
【００２１】一方，平板材２は，平坦な，厚み０．０５
ｍｍの帯状のステンレス鋼板で，その表面に上記電気絶
縁層２５が形成されている。この電気絶縁層２５は，平
板材２の表面に，アルミナゾルを塗布し，焼付けること
により，厚み約０．０１〜０．０５ｍｍに形成されてい
る。On the other hand, the flat plate member 2 is flat and has a thickness of 0.05.
The electrical insulating layer 25 is formed on the surface of a strip-shaped stainless steel plate of mm. The electrically insulating layer 25 is formed to have a thickness of about 0.01 to 0.05 mm by applying alumina sol to the surface of the flat plate material 2 and baking it.
【００２２】波板材１と平板材２とは，交互に重ねて，
図１に示すごとく，中心電極２９に対して渦巻き状に巻
回されている。上記波板材１と平板材２とは，上記巻き
付け後に，それぞれの端縁１１，１２の一部が，中心電
極２９と外筒３とを結ぶように接合部４１により接合さ
れ，図１に示すごとく，十文字状の接合領域部４を形成
している。The corrugated sheet material 1 and the flat sheet material 2 are alternately stacked,
As shown in FIG. 1, it is spirally wound around the center electrode 29. After the winding, the corrugated sheet material 1 and the flat sheet material 2 are joined together by a joint portion 41 so as to connect a part of the respective end edges 11 and 12 to the center electrode 29 and the outer cylinder 3, as shown in FIG. Thus, the cross-shaped junction region portion 4 is formed.
【００２３】上記の接合は，放電溶接により行っている
（図３）。上記接合領域部４は中心電極２９にも接合さ
れている。そして，接合領域部４は中心電極２９，リー
ド線４７，スイッチ４６を介して電源４５に接続されて
いる。また，上記波板材１及び平板材２の表面には，触
媒が担持してある。この触媒は，上記本体１０の内部に
酸化熱処理を施し，γ−アルミナを被覆するウォッシュ
コートを施し，その後このγ−アルミナ層に白金，ロジ
ウム等の触媒成分を担持させることにより形成してあ
る。The above-mentioned joining is performed by discharge welding (FIG. 3). The bonding area portion 4 is also bonded to the center electrode 29. The junction region 4 is connected to the power supply 45 via the center electrode 29, the lead wire 47, and the switch 46. A catalyst is carried on the surfaces of the corrugated plate material 1 and the flat plate material 2. This catalyst is formed by subjecting the inside of the main body 10 to an oxidative heat treatment, applying a wash coat for coating γ-alumina, and then supporting a catalyst component such as platinum or rhodium on the γ-alumina layer.
【００２４】上記ように構成した触媒コンバータ１００
は，図５に示すごとく，排気通路内に配置する。即ち，
上記触媒コンバータ１００は，浄化コンバータ５のケー
ス５４内において，主モノリス触媒５５よりも上流側に
配置する。上記浄化コンバータ５は，エンジン５１の排
気パイプ５２に接続されている。The catalytic converter 100 configured as described above
Are arranged in the exhaust passage as shown in FIG. That is,
The catalytic converter 100 is arranged in the case 54 of the purification converter 5 on the upstream side of the main monolith catalyst 55. The purification converter 5 is connected to the exhaust pipe 52 of the engine 51.
【００２５】次に，本例の作用効果につき説明する。ま
ず，エンジン５１を始動すると排気ガスが触媒コンバー
タ１００のガス流路２０内を通過して，主モノリス触媒
５５を経て，排出される。一方，上記エンジン始動と同
時に，触媒コンバータ１００のスイッチ４６をオンとす
る。これにより，加熱用電流４０は，中心電極２９より
接合領域部４における平板材２，接合部４１，波板材１
の電流通路１４を流れ（図３），更に一方の接合部４１
より他方の平板材２へと順次半径方向に流れる。この流
れは，上記接合領域部４において，外筒３の方向へ向か
う。Next, the function and effect of this example will be described. First, when the engine 51 is started, the exhaust gas passes through the gas passage 20 of the catalytic converter 100, is discharged through the main monolith catalyst 55. On the other hand, at the same time when the engine is started, the switch 46 of the catalytic converter 100 is turned on. As a result, the heating current 40 is applied from the center electrode 29 to the flat plate material 2, the joint portion 41, and the corrugated sheet material 1 in the joint region portion 4.
Flow through the current passage 14 (FIG. 3) of the
It flows to the other flat plate material 2 sequentially in the radial direction. This flow is directed toward the outer cylinder 3 in the joining area portion 4.
【００２６】そして，上記電流通路１４は，貫通穴１２
と端縁１１との間にあり，電流通路１４よりも内側は電
気絶縁層２５が形成してある。そのため，上記電流は狭
い通路の電流通路１４のみを流れることになる。それ
故，電流通路１４における電流密度が高くなり，この部
分が局所的に昇温する。The current passage 14 has a through hole 12
And the end edge 11, and an electric insulating layer 25 is formed inside the current passage 14. Therefore, the current flows only through the narrow current passage 14. Therefore, the current density in the current passage 14 becomes high, and this portion locally heats up.
【００２７】そのため，触媒コンバータ１００の上流側
２０１が早期に触媒活性化温度に到達する。また，それ
に伴って，触媒反応が生じ，昇温を助長する。それ故，
下流側も，上流側の熱によって次々と短時間に昇温し，
触媒反応が生じ，昇温される。そのため，短時間に，触
媒コンバータ全体を触媒活性化温度まで昇温させること
ができる。それ故，問題視されているエンジン始動期に
おける排気ガス浄化能力を，向上させることができる。Therefore, the upstream side 201 of the catalytic converter 100 reaches the catalyst activation temperature early. Further, along with this, a catalytic reaction occurs to promote the temperature rise. Therefore,
The temperature on the downstream side also rises in a short time due to the heat on the upstream side,
A catalytic reaction occurs and the temperature is raised. Therefore, the entire catalytic converter can be heated to the catalyst activation temperature in a short time. Therefore, it is possible to improve the exhaust gas purifying ability in the engine starting period, which is regarded as a problem.
【００２８】また，本例の触媒コンバータは，上流側に
おいて上記電流通路に電流を通すのみで良いから，従来
の全体通電加熱方式に比較して，加熱電力が低くて済
む。また，本例では，図５に示すごとく，触媒コンバー
タ１００の下流側に近接して主モノリス触媒５５を配置
してある。そのため，エンジン始動期における触媒コン
バータ１００の上記加熱によって，主モノリス触媒５５
も早期に昇温させることができる。それ故，上記始動期
においても全体として高い排気ガス浄化性能を発揮する
ことができる。Further, in the catalytic converter of the present embodiment, only the current needs to be passed through the current passage on the upstream side, so that the heating power can be lower than that of the conventional general energization heating method. Further, in this example, as shown in FIG. 5, the main monolith catalyst 55 is arranged in the vicinity of the downstream side of the catalytic converter 100. Therefore, the main monolith catalyst 55 is heated by the above-described heating of the catalytic converter 100 during the engine starting period.
Can also raise the temperature early. Therefore, the exhaust gas purification performance as a whole can be exerted even in the starting period.
【００２９】なお，上記においては，波板材１の貫通穴
１２は，図３に示すごとく，波板材の１つの傾斜面にお
いて，１つの四角形穴としたが，図４に示すごとく，多
数の短冊穴とすることもできる。この場合には端縁１１
近傍における強度が高い。また，触媒コンバータ１００
をエンジン５１の排気マニホールドの成るべく近くに設
ける場合には，排気ガスの温度を触媒コンバータ１００
の昇温に有効利用することができる。In the above description, the through hole 12 of the corrugated sheet material 1 is a square hole on one inclined surface of the corrugated sheet material as shown in FIG. 3, but as shown in FIG. It can also be a hole. In this case, the edge 11
High strength in the vicinity. In addition, the catalytic converter 100
When the engine is installed as close as possible to the exhaust manifold of the engine 51, the temperature of the exhaust gas is adjusted to the catalytic converter 100.
Can be effectively used for raising the temperature.
【００３０】実施例２ 本例の触媒コンバータは，図６，図７に示すごとく，波
板材１と平板材２との，端縁１１，２１における接合に
関して，波板材１に小突起１３を設けたものである。上
記小突起１３は，波板材１の端縁１１に，四角溝状に設
けてある。Embodiment 2 In the catalytic converter of this embodiment, as shown in FIGS. 6 and 7, regarding the joining of the corrugated sheet material 1 and the flat sheet material 2 at the edges 11, 21, a small protrusion 13 is provided on the corrugated sheet material 1. It is a thing. The small protrusions 13 are provided on the edge 11 of the corrugated sheet 1 in the shape of a square groove.
【００３１】この小突起１３の突出高さは，図７に示す
ごとく，電気絶縁層２５の厚みとほぼ同じである。その
ため，端縁１１においては，図７に示すごとく，平板材
２の端縁２１と小突起１３の四角面状の背面１３１とが
直接に接触している。そして，両者が接合部４１により
接合されている。その他は，実施例１と同様である。As shown in FIG. 7, the protruding height of the small protrusions 13 is almost the same as the thickness of the electric insulating layer 25. Therefore, at the edge 11, as shown in FIG. 7, the edge 21 of the flat plate member 2 and the quadrangular back surface 131 of the small protrusion 13 are in direct contact with each other. And both are joined by the joining part 41. Others are the same as in the first embodiment.
【００３２】本例においては，上記小突起１３の背面１
３１と平板材２とが面状に密接し，接合部４１により溶
接されている。そのため，エンジン振動に対して，強い
耐震性を有し，また厳しい冷熱サイクルにも優れた接合
耐久性を発揮する。また，そのため，排気マニホールド
直下への取付けも可能となる。なお，上記小突起１３
は，平板材２に設けることもできる。その他，実施例１
と同様の効果を得ることができる。In this example, the back surface 1 of the small protrusion 13 is
31 and the flat plate member 2 are in close contact with each other in a planar shape and are welded to each other at the joint portion 41. Therefore, it has strong earthquake resistance against engine vibration and exhibits excellent joining durability even under severe cooling and heating cycles. Therefore, it is possible to install it just below the exhaust manifold. In addition, the small protrusion 13
Can also be provided on the flat plate member 2. Others, Example 1
The same effect as can be obtained.
【００３３】実施例３ 本例の触媒コンバータは，図８〜図１１に示すごとく，
中心電極２９より８方向に，接合領域部４を形成したも
のである。上記接合領域部４においては，図９，図１１
に示すごとく，実施例２と同様に，波板材１の端縁１１
に小突起１３を設け，該小突起１３と平板材２の端縁２
１とを，接合部４１により接合している。Embodiment 3 The catalytic converter of this embodiment is as shown in FIGS.
The bonding region 4 is formed in eight directions from the center electrode 29. In the above-mentioned joining area portion 4, the joint area portion 4 shown in FIG.
As shown in FIG. 5, the edge 11 of the corrugated sheet material 1 is similar to the second embodiment.
A small protrusion 13 is provided on the small protrusion 13 and the edge 2 of the flat plate material 2.
1 and 1 are joined by a joint portion 41.
【００３４】また，接合領域部４以外の部分では，図１
０，図１１に示すごとく，上記小突起１３は設けないと
共に，接合領域部４において小突起１３を設けた端縁１
１を貫通穴１２よりも上方において切り欠いた切欠き部
１６を有している。また，この切欠き部１６に対面す
る，平板材２の端縁も切欠いて，切欠き部２６を有して
いる（図１１）。In addition, in the portion other than the joining region portion 4, FIG.
0, as shown in FIG. 11, the small protrusion 13 is not provided, and the edge 1 provided with the small protrusion 13 in the joining region 4 is provided.
1 has a cutout portion 16 cut out above the through hole 12. Further, the edge of the flat plate material 2 facing the notch 16 is also notched and has a notch 26 (FIG. 11).
【００３５】上記構造の触媒コンバータを作製するに当
たっては，まず波板材１の全ての端縁１１に小突起１３
を設けておき，これと平板材２の端縁２１とを放電溶接
する。その後，上記接合領域部４以外の部分の小突起１
３及びこれと溶接されている平板材２の端縁とを焼切
る。これにより上記切欠き部１６，２６が形成される。In producing the catalytic converter having the above structure, first, the small protrusions 13 are formed on all the edges 11 of the corrugated sheet material 1.
Is provided and the edge 21 of the flat plate material 2 is discharge-welded. After that, the small protrusions 1 other than the above-mentioned joining region portion 4
3 and the edge of the flat plate material 2 welded thereto are burnt out. As a result, the notches 16 and 26 are formed.
【００３６】本例においては，中心電極２９より８方向
に伸びる接合領域部４を形成している。そのため，触媒
コンバータ１００の中心から外方へ向かって流れる半径
方向電流が，中心電極２９付近において過密になること
を防止できる。そのため，触媒コンバータ１００の端縁
全体をほぼ均一に発熱させることができ，適正な抵抗値
を確保することができる。また，実施例１と同様の効果
を得ることができる。In this example, the junction region 4 extending from the center electrode 29 in eight directions is formed. Therefore, the radial current flowing outward from the center of the catalytic converter 100 can be prevented from becoming overcrowded in the vicinity of the center electrode 29. Therefore, the entire edge of the catalytic converter 100 can generate heat almost uniformly, and an appropriate resistance value can be secured. Further, the same effect as that of the first embodiment can be obtained.
【図１】実施例１の触媒コンバータの一部切欠き斜視
図。FIG. 1 is a partially cutaway perspective view of a catalytic converter according to a first embodiment.
【図２】実施例１の触媒コンバータの波板材と平板材と
の配置状態を示す説明図。FIG. 2 is an explanatory diagram showing an arrangement state of a corrugated plate material and a flat plate material of the catalytic converter according to the first embodiment.
【図３】図２のＡ−Ａ線矢視断面図。3 is a sectional view taken along the line AA of FIG.
【図４】実施例１における，波板材の貫通穴の他の状態
を示す，図３と同様の断面図。FIG. 4 is a sectional view similar to FIG. 3, showing another state of the through hole of the corrugated sheet material in the first embodiment.
【図５】実施例１の触媒コンバータの使用説明図。FIG. 5 is an explanatory diagram of the use of the catalytic converter according to the first embodiment.
【図６】実施例２の触媒コンバータにおける上流側端縁
の部分斜視図。FIG. 6 is a partial perspective view of an upstream edge of the catalytic converter according to the second embodiment.
【図７】実施例２の波板材と平板材との接合部分の説明
図。FIG. 7 is an explanatory view of a joint portion between the corrugated plate material and the flat plate material according to the second embodiment.
【図８】実施例３の触媒コンバータの平面図。FIG. 8 is a plan view of a catalytic converter according to a third embodiment.
【図９】図８のＢ部分の拡大図。9 is an enlarged view of portion B in FIG.
【図１０】図８のＣ部分の拡大図。FIG. 10 is an enlarged view of portion C of FIG.
【図１１】実施例３の触媒コンバータにおける，上流側
端縁の部分斜視図。FIG. 11 is a partial perspective view of an upstream edge of the catalytic converter according to the third embodiment.
１．．．波板材， １０．．．本体， １１．．．端縁， １２．．．貫通穴， １３．．．小突起， １４．．．電流通路， １００．．．触媒コンバータ， ２．．．平板材， ２０．．．ガス通路， ２０１．．．上流側， ２１．．．端縁， ２５．．．電気絶縁層， ２９．．．中心電極， ３．．．外筒， ４１．．．接合部， 1. ． ． Corrugated sheet material, 10. ． ． Main body, 11. ． ． Edge, 12. ． ． Through hole, 13. ． ． Small protrusion, 14. ． ． Current path, 100. ． ． Catalytic converter, 2. ． ． Flat plate material, 20. ． ． Gas passage, 201. ． ． Upstream side, 21. ． ． Edge, 25. ． ． Electrical insulation layer, 29. ． ． Center electrode, 3. ． ． Outer cylinder, 41. ． ． Joint,
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０１Ｎ 3/20 ＺＡＢ Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display area F01N 3/20 ZAB K
Claims (2)
ータであって，該触媒コンバータは連続して折曲成形さ
れた金属製の波板材と，平坦な帯状をなす金属製の平板
材とを交互に重ねてガス流路を形成してなる本体と，該
本体の外周に設けた外筒とよりなり，上記波板材は，排
気ガスの上流側において，その幅方向の端縁近くに波板
材の長手方向に沿った貫通穴を有すると共に，該貫通穴
と上記端縁との間に電流通路を形成しており，また，波
板材と平板材との対面部分には，上記電流通路よりも内
側に電気絶縁層を有し，かつ，上記上流側における波板
材の端縁と平板材の端縁とはその全部又は一部が接合さ
れて接合領域部を形成し，上記接合領域部と上記外筒と
の間には上記上流側を加熱するための加熱用電源を介設
したことを特徴とする排気ガス浄化用触媒コンバータ。1. A catalytic converter for purifying exhaust gas of an engine, wherein the catalytic converter alternates between a continuous corrugated metal corrugated sheet material and a flat strip-shaped metallic flat plate material. A corrugated sheet material formed on the upstream side of the exhaust gas in the vicinity of the widthwise end edge of the corrugated sheet material. In addition to having a through hole along the longitudinal direction, a current passage is formed between the through hole and the end edge, and at the facing portion between the corrugated plate material and the flat plate material, the inside of the current passage is formed. Has an electrical insulating layer on the upstream side, and the edges of the corrugated sheet material and the edges of the flat sheet material on the upstream side are wholly or partially joined to form a joining area portion, and the joining area portion and the outer portion A heating power source for heating the upstream side is interposed between the cylinder and the cylinder. Exhaust gas purification catalytic converter.
接合は，波板材又は平板材のいずれか一方に小突起を設
けることにより形成していることを特徴とする排気ガス
浄化用触媒コンバータ。2. The catalytic converter for purifying exhaust gas according to claim 1, wherein the joint in the joint region is formed by providing a small protrusion on either one of the corrugated plate material and the flat plate material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4316463A JPH06146871A (en) | 1992-10-29 | 1992-10-29 | Catalytic converter for exhaust emission control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4316463A JPH06146871A (en) | 1992-10-29 | 1992-10-29 | Catalytic converter for exhaust emission control |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8225352A Division JP2960015B2 (en) | 1996-08-27 | 1996-08-27 | Catalytic converter for exhaust gas purification |
| JP8225362A Division JPH09117639A (en) | 1996-08-27 | 1996-08-27 | Exhaust gas purification catalytic converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06146871A true JPH06146871A (en) | 1994-05-27 |
Family
ID=18077380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4316463A Pending JPH06146871A (en) | 1992-10-29 | 1992-10-29 | Catalytic converter for exhaust emission control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06146871A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009543684A (en) * | 2006-07-14 | 2009-12-10 | エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Method for forming notched opening in metal foil and honeycomb body for exhaust gas treatment manufactured by this method |
| JP2014117632A (en) * | 2012-12-13 | 2014-06-30 | Toyota Industries Corp | Catalyst carrier and method of producing catalyst carrier |
-
1992
- 1992-10-29 JP JP4316463A patent/JPH06146871A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009543684A (en) * | 2006-07-14 | 2009-12-10 | エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Method for forming notched opening in metal foil and honeycomb body for exhaust gas treatment manufactured by this method |
| JP2014117632A (en) * | 2012-12-13 | 2014-06-30 | Toyota Industries Corp | Catalyst carrier and method of producing catalyst carrier |
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