JP4098363B2 - Honeycomb body - Google Patents

Honeycomb body Download PDF

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Publication number
JP4098363B2
JP4098363B2 JP51523098A JP51523098A JP4098363B2 JP 4098363 B2 JP4098363 B2 JP 4098363B2 JP 51523098 A JP51523098 A JP 51523098A JP 51523098 A JP51523098 A JP 51523098A JP 4098363 B2 JP4098363 B2 JP 4098363B2
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Prior art keywords
honeycomb body
thermal conductivity
notch opening
reduced
inlet
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JP2001500785A (en
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ブリュック、ロルフ
ディーワルト、ローベルト
Original Assignee
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
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/14—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by endowing the walls of conduits with zones of different degrees of conduction of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)

Description

【技術分野】
【０００１】
本発明は入口範囲と出口範囲とを有し流体で貫流されるハニカム体、特に排気ガス触媒用ハニカム体に関する。入口範囲および出口範囲は流体が貫流できる通路によって互いに接続されている。
【背景技術】
【０００２】
このようなハニカム体は特にいわゆる排気ガス触媒用ハニカム体として使用されている。種々の横断面形状を取り得る流体で貫流される構造物（ハニカム体）が知られている（例えば、特許文献１参照）。排気装置の排気ガス流における有害成分を減少するために、その構造物は有害物質の触媒変換にとって十分な高い温度になっていなければならない。触媒のできるだけ迅速な始動特性を得るために、構造物を電気加熱することが既に提案されている（例えば、特許文献２参照）。この構造物の電気加熱によって内燃機関の低温始動中に生ずる排気ガスの有害物質の吐き出しが減少される。自動車が短距離走行運転し個々の運転サイクル間に多少長い休止時間が設けられる場合、自動車が運転停止したときに内燃機関並びにその排気装置全体が冷える。このような排気装置特にハニカム体の冷え込みはハニカム体を再三にわたって電気加熱しなければならなくする。これは場合によってはエネルギー源即ち自動車のバッテリに大きな負荷を与えることになる。従って短距離走行運転の場合、バッテリが常に十分に充電されることが保証されなくなる。
【０００３】
ハニカム体の加熱にとって必要なエネルギー需要を減少するために、ハニカム体に熱絶縁体を設けることが既に提案されている。二重外被装置の形に構成された熱絶縁体付きハニカム体が知られている（例えば、特許文献３参照）。この二重外被装置は外側外被管の中にこれに間隔をおいて配置されている内部外被管を有している。内部外被管と外部外被管との間に存在する中間室が熱絶縁体として作用する。これによって構造物の外周面からの放熱が減少される。
【０００４】
【特許文献１】
国際公開第９０／０３２２０号パンフレット
【特許文献２】
国際公開第８９／１０４７１号パンフレット
【特許文献３】
国際公開第９０／０４０８７号パンフレット
【発明の開示】
【発明が解決しようとする課題】
【０００５】
本発明の課題は、流体で貫流されるハニカム体をこのハニカム体の熱損失が一層減少されるように改良することにある。
【課題を解決するための手段】
【０００６】
この課題は本発明によれば、流体が貫流できる通路によって互いに接続されている入口範囲と出口範囲とを有し流体で貫流されるハニカム体において、ハニカム体が入口範囲および出口範囲にのみそれぞれ熱伝導率低減部分を有し、熱伝導率低減部分はハニカム体の横断面全体にわたって延び、熱伝導率低減部分は通路の壁部の切欠き開口により形成され、切欠き開口はハニカム体の両側端面から間隔を置いてハニカム体の両側端面の後方に設けられ、切欠き開口はハニカム体の横断面全体にわたって流体の流れ方向に対して直角に延在していることによって解決される。
【０００７】
このハニカム体の有利な実施態様は次の通りである。
熱伝導率低減部分の少なくとも幾つかの通路の壁部が少なくとも一つの切欠き開口を有している（請求項２）。
ハニカム体が少なくとも部分的に構造化された板金の巻回ないし積層された層によって形成されている（請求項３）。
ハニカム体が入口範囲および出口範囲の近くにそれぞれ熱伝導率低減部分を有する外被管内に配置されている（請求項４）。
外被管の熱伝導率低減部分とハニカム体の熱伝導率低減部分とがハニカム体の１つの横断面上に存在している（請求項５）。
外被管の熱伝導率低減部分が切欠き開口によって形成されている（請求項６）。
【０００８】
本発明に基づくハニカム体は、ハニカム体が少なくとも入口範囲および出口範囲の近くに熱伝導率低減部分を有していることを特徴としている。排気ガス触媒用ハニカム体として作用するハニカム体の場合、このハニカム体に結合された排気装置の構成要素への熱伝導並びに排気装置内に存在する排気ガスの対流による端面側の熱損失が意外にも熱損失全体にかなり貢献することが明らかになった。このような特に端面側の熱損失を防止するために本発明に基づくハニカム体が提案される。入口および出口範囲の近くにそれぞれ熱伝導率低減部分が形成されることによって、ハニカム体とこれに隣接する排気装置の構造部品とが熱的に十分に切り離される。熱伝導率低減部分は少なくとも部分的にハニカム体の中に入り込んでいる。
【０００９】
ハニカム体が入口および出口範囲の近くにそれぞれ熱伝導率低減部分を有していることによって、中央部の熱損失が減少され、これによってハニカム体の入口範囲と出口範囲との間に位置する部分は公知のハニカム体の場合よりも長時間にわたって高温状態にある。これによってハニカム体の入口範囲と出口範囲との間が高い温度レベルにあるので、再始動後における排気ガスの浄化作用が改善される。従って入口範囲と出口範囲との間の部分の加熱が著しく早まり、これによって触媒変換にとって必要な温度も迅速に得られる。
【００１０】
熱伝導率低減部分がハニカム体の横断面全体にわたって延びているようにハニカム体を形成すると有利である。ハニカム体の熱伝導率の低減はその少なくとも一つの通路の壁部が少なくとも部分的に薄い壁厚で形成されていることによって得られる。これによって熱移送方向における横断面積が減少される。
【００１１】
本発明に基づくハニカム体の有利な実施態様によれば、熱伝導率低減部分が少なくとも一つの通路の壁部を少なくとも一つの切欠き開口を有するように形成することが提案される。ハニカム体がこのように形成されている場合、ハニカム体の熱移送の作用をする横断面積が減少される。しかし通路の壁部への切欠き開口の形成によってハニカム体の強度が阻害されることに注意しなければならない。このようなハニカム体の強度低下は、熱伝導率低減部分が切欠き開口を持たずに熱絶縁材料から成っているときには生じない。
【００１２】
ハニカム体における切欠き開口の形成はハニカム体の製造工程前、製造工程中あるいは製造工程後に行われる。ハニカム体が少なくとも部分的に構造化された板金の巻回ないし積層された層によって形成されるときには、切欠き開口の形成は板金層の巻回ないし積層前に行われなければならない。
【００１３】
入口および出口範囲の近くにそれぞれ熱伝導率低減部分を有している流体で貫流されるハニカム体は特に排気ガス触媒用ハニカム体として適している。好適にはこのようなハニカム体は入口および出口範囲の近くに熱伝導率低減部分を有する外被管内に配置される。このためにこの部分が外被管における切欠き開口によって形成されることが提案される。外被管ないしハニカム体特にハニカム体における切欠き開口はパーフォレーション（パンチング孔）とすることができる。外被管の熱伝導率低減部分とハニカム体の熱伝導率低減部分とは好適にはハニカム体の１つの横断面上に存在している。ハニカム体の物体的な形成と内燃機関の再始動後における排気ガスの触媒変換にとって必要な温度への到達との上述の関係は、その中にハニカム体がハニカム体として配置されている外被管が入口および出口範囲にそれぞれ熱伝導率低減部分を有していることによって一層強化される。これによって外被管からそれに隣接する排気装置の構造部品への熱伝導が著しく減少される。
【発明を実施するための最良の形態】
【００１４】
以下図面に示した実施例を参照して本発明の利点および特徴を説明する。
図１はハニカム体の第１の実施例の概略図、
図２は排気装置におけるハニカム体の第２の実施例の概略図である。
【００１５】
図１は流体Ｆで貫流されるハニカム体１を示している。ハニカム体１は入口範囲２と出口範囲３を有している。入口範囲２と出口範囲３は互いに流体が貫流できる通路４によって接続されている。ハニカム体１は外被管５の中に配置されている。ハニカム体１において入口範囲２の近くに熱伝導率低減部分６が形成されている。この部分６は切欠き開口７によって形成されている。切欠き開口７は通路４の壁部８に形成され、少なくとも部分的に流体Ｆの流れ方向に対して直角に延びている。出口範囲３の近くにも熱伝導率低減部分１０を形成する切欠き開口９が設けられている。この切欠き開口９は通路４の壁部８に設けられている。外被管５もハニカム体１の入口範囲２ないし出口範囲３に熱伝導率低減部分１１，１２を有している。これらの部分１１，１２は切欠き開口１３ないし１４によって形成されている。図１に示された実施例において熱伝導率低減部分６，１０，１１，１２の切欠き開口７，９，１３，１４は長孔状に形成されている。これらは外被管５並びにハニカム体１において同形に形成されている。
【００１６】
あるいはまた切欠き開口１３は図２に示されているように横断面円形にすることもできる。切欠き開口は好適にはハニカム体の両側端面より５〜１５ｍｍ後方に一平面内に設けられている。図２は内燃機関の排気装置内におけるハニカム体１の配置を示している。ハニカム体１は外被管５を有し、この外被管５は入口範囲２の近くに切欠き開口１３を、出口範囲３の近くに切欠き開口１４を有している。ハニカム体１の外被管５は絶縁材料１５で包囲されている。この絶縁材料１５は外側の外被管１６によって包囲されている。入口範囲２の前にディフューザ１７が形成され、これは外側の外被管１６に接続されている。出口範囲３にコンフューザ１８が形成され、これも外側の外被管１６に接続されている。外被管５の熱伝導率低減部分１１，１２および好適には積層あるいは巻回された板金から成るハニカム体１の熱伝導率低減部分６，９によって、ハニカム体１の中央部からコンフューザないしディフューザないしその前に存在するガス室への放熱が減少される。これによって熱絶縁材料１５並びに熱伝導率低減部分で境界づけられたいわば高温の「セル」が得られる。これによって排気ガス浄化装置のエネルギー的に良好な形態が得られる。
【図面の簡単な説明】
【００１７】
【図１】ハニカム体の第１の実施例の概略図
【図２】排気装置におけるハニカム体の第２の実施例の概略図
【符号の説明】
【００１８】
１ ハニカム体
２ 入口範囲
３ 出口範囲
４ 通路
５ 外被管
６ 熱伝導率低減部分
７ 切欠き開口
８ 通路壁部
９ 切欠き開口
１０ 熱伝導率低減部分
１１，１２ 熱伝導率低減部分
１３，１４ 熱伝導率低減部分
１５ 絶縁材料
１６ 外側の外被管
１７ ディフューザ
１８ コンフューザ【Technical field】
[0001]
The present invention relates to a honeycomb body having an inlet area and an outlet area, and particularly to a honeycomb body for an exhaust gas catalyst. The inlet area and the outlet area are connected to each other by a passage through which fluid can flow.
[Background]
[0002]
Such a honeycomb body is particularly used as a so-called honeycomb body for an exhaust gas catalyst. A structure (honeycomb body) that is flown by a fluid that can take various cross-sectional shapes is known (see, for example, Patent Document 1) . In order to reduce harmful components in the exhaust system exhaust gas stream, the structure must be at a high enough temperature for the catalytic conversion of harmful substances. In order to obtain the starting characteristics of the catalyst as quickly as possible, it has already been proposed to electrically heat the structure (see, for example, Patent Document 2) . The electrical heating of this structure reduces the exhaust of harmful substances in the exhaust gas that occurs during the cold start of the internal combustion engine. When the vehicle is driven for a short distance and a somewhat longer downtime is provided between the individual driving cycles, the internal combustion engine and the entire exhaust system are cooled when the vehicle is shut down. Such cooling of the exhaust device, in particular the honeycomb body, requires that the honeycomb body be repeatedly heated electrically. This in some cases places a heavy load on the energy source, ie the car battery. Therefore, in short-distance driving operation, it is not guaranteed that the battery is always fully charged.
[0003]
In order to reduce the energy demand required for heating the honeycomb body, it has already been proposed to provide the honeycomb body with a thermal insulator. A honeycomb body with a thermal insulator configured in the form of a double envelope device is known (see, for example, Patent Document 3) . This double envelope device has an inner envelope tube arranged in the outer envelope tube at a distance from it. An intermediate chamber existing between the inner jacket tube and the outer jacket tube acts as a thermal insulator. Thereby, the heat radiation from the outer peripheral surface of the structure is reduced.
[0004]
[Patent Document 1]
International Publication No. 90/03220 Pamphlet [Patent Document 2]
International Publication No. 89/10471 [Patent Document 3]
International Publication No. 90/04087 Pamphlet [Disclosure of the Invention]
[Problems to be solved by the invention]
[0005]
An object of the present invention is to improve a honeycomb body that flows through with a fluid so that heat loss of the honeycomb body is further reduced.
[Means for Solving the Problems]
[0006]
According to the present invention, according to the present invention, in a honeycomb body having an inlet range and an outlet range that are connected to each other by a passage through which fluid can flow, the honeycomb body is heated only in the inlet range and the outlet range. Having a conductivity reducing portion, the thermal conductivity reducing portion extending over the entire cross section of the honeycomb body, the thermal conductivity reducing portion being formed by a notch opening in the wall of the passage, and the notch opening being the end faces on both sides of the honeycomb body This is solved by the fact that the notch opening extends at right angles to the fluid flow direction over the entire cross section of the honeycomb body.
[0007]
An advantageous embodiment of this honeycomb body is as follows .
The wall of at least some of the passages of the reduced thermal conductivity portion has at least one notch opening (claim 2) .
The honeycomb body is formed by a wound or laminated layer of at least partially structured sheet metal (Claim 3) .
The honeycomb body is arranged in a jacket tube having a portion with reduced thermal conductivity near the inlet area and the outlet area, respectively .
The thermal conductivity reduced portion of the jacket tube and the thermal conductivity reduced portion of the honeycomb body are present on one cross section of the honeycomb body (Claim 5) .
The portion of the outer tube where the thermal conductivity is reduced is formed by a notch opening .
[0008]
The honeycomb body according to the present invention is characterized in that the honeycomb body has a portion having a reduced thermal conductivity in the vicinity of at least the entrance range and the exit range. In the case of a honeycomb body acting as a honeycomb body for an exhaust gas catalyst, heat conduction to the components of the exhaust device coupled to the honeycomb body and heat loss on the end face side due to convection of exhaust gas existing in the exhaust device are unexpectedly surprising. It has also been found that it contributes significantly to overall heat loss. In order to prevent such heat loss particularly on the end face side, a honeycomb body according to the present invention is proposed. By forming the thermal conductivity reducing portions near the inlet and outlet areas, the honeycomb body and the structural parts of the exhaust device adjacent to the honeycomb body are sufficiently thermally separated. The portion with reduced thermal conductivity has at least partially penetrated into the honeycomb body.
[0009]
The honeycomb body has heat conductivity reducing portions near the inlet and outlet areas, respectively, thereby reducing the heat loss in the central portion, and thereby the portion located between the inlet area and the outlet area of the honeycomb body. Is at a higher temperature for a longer time than in the case of known honeycomb bodies. As a result, since the temperature range between the inlet range and the outlet range of the honeycomb body is at a high temperature level, the exhaust gas purification action after restart is improved. Thus, the heating of the part between the inlet and outlet ranges is significantly accelerated, and the temperature required for the catalytic conversion can also be obtained quickly.
[0010]
It is advantageous to form the honeycomb body such that the portion with reduced thermal conductivity extends over the entire cross section of the honeycomb body. A reduction in the thermal conductivity of the honeycomb body is obtained by at least partially forming the wall of the at least one passage with a thin wall thickness. This reduces the cross-sectional area in the heat transfer direction.
[0011]
According to an advantageous embodiment of the honeycomb body according to the invention, it is proposed that the thermal conductivity reducing part is formed so that the wall part of at least one passage has at least one notch opening. When the honeycomb body is formed in this way, the cross-sectional area that acts as a heat transfer of the honeycomb body is reduced. However, it should be noted that the strength of the honeycomb body is hindered by the formation of a notch opening in the wall of the passage. Such a decrease in the strength of the honeycomb body does not occur when the thermal conductivity reduced portion is made of a heat insulating material without having a notch opening.
[0012]
The formation of the notch opening in the honeycomb body is performed before, during or after the manufacturing process of the honeycomb body. When the honeycomb body is formed by at least partially structured sheet metal winding or lamination layers, the formation of the notch opening must be performed before the sheet metal layer winding or lamination.
[0013]
A honeycomb body that is flown by a fluid having a portion having reduced thermal conductivity near the inlet and outlet areas is particularly suitable as a honeycomb body for an exhaust gas catalyst. Preferably, such a honeycomb body is placed in a jacket tube having a portion of reduced thermal conductivity near the inlet and outlet areas. For this purpose, it is proposed that this part is formed by a notch opening in the jacket tube. The notch opening in the jacket tube or the honeycomb body, particularly the honeycomb body, can be perforation (punching hole). The portion of the outer tube where the thermal conductivity is reduced and the portion of the honeycomb body where the thermal conductivity is reduced preferably exist on one transverse section of the honeycomb body. The above-mentioned relationship between the physical formation of the honeycomb body and the reaching of the temperature necessary for catalytic conversion of the exhaust gas after restarting the internal combustion engine is the same as that in which the honeycomb body is disposed as a honeycomb body. Is further enhanced by having thermal conductivity reducing portions in the inlet and outlet areas, respectively. This significantly reduces the heat transfer from the jacket tube to the structural parts of the exhaust system adjacent to it.
BEST MODE FOR CARRYING OUT THE INVENTION
[0014]
Advantages and features of the present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 is a schematic view of a first embodiment of a honeycomb body,
FIG. 2 is a schematic view of a second embodiment of the honeycomb body in the exhaust device.
[0015]
FIG. 1 shows a honeycomb body 1 that flows through with a fluid F. The honeycomb body 1 has an inlet range 2 and an outlet range 3. The inlet area 2 and the outlet area 3 are connected by a passage 4 through which fluid can flow. The honeycomb body 1 is disposed in the jacket tube 5. In the honeycomb body 1, a thermal conductivity reducing portion 6 is formed near the entrance area 2. This portion 6 is formed by a notch opening 7. The notch opening 7 is formed in the wall 8 of the passage 4 and extends at least partially perpendicular to the flow direction of the fluid F. A notch opening 9 is also provided in the vicinity of the outlet area 3 to form a reduced thermal conductivity portion 10. The notch opening 9 is provided in the wall portion 8 of the passage 4. The jacket tube 5 also has thermal conductivity reducing portions 11 and 12 in the inlet range 2 to the outlet range 3 of the honeycomb body 1. These portions 11 and 12 are formed by cutout openings 13 to 14. In the embodiment shown in FIG. 1, the notched openings 7, 9, 13, and 14 of the thermal conductivity reducing portions 6, 10, 11, and 12 are formed in a long hole shape. These are formed in the same shape in the jacket tube 5 and the honeycomb body 1.
[0016]
Alternatively, the notch opening 13 can be circular in cross section as shown in FIG. The notch openings are preferably provided in a plane 5 to 15 mm behind the end faces on both sides of the honeycomb body. FIG. 2 shows the arrangement of the honeycomb body 1 in the exhaust device of the internal combustion engine. The honeycomb body 1 has a jacket tube 5, which has a notch opening 13 near the inlet area 2 and a notch opening 14 near the outlet area 3. The outer tube 5 of the honeycomb body 1 is surrounded by an insulating material 15. This insulating material 15 is surrounded by an outer envelope tube 16. A diffuser 17 is formed in front of the inlet area 2 and is connected to the outer envelope tube 16. A diffuser 18 is formed in the outlet area 3, which is also connected to the outer jacket tube 16. By means of the thermal conductivity reducing parts 11, 12 of the jacket tube 5 and preferably the thermal conductivity reducing parts 6, 9 of the honeycomb body 1 made of laminated or wound sheet metal, a diffuser or diffuser from the central part of the honeycomb body 1. In addition, the heat radiation to the gas chamber existing before that is reduced. This results in a so-called high temperature “cell” bounded by the thermal insulation material 15 and the reduced thermal conductivity. As a result, an energy-efficient form of the exhaust gas purification device can be obtained.
[Brief description of the drawings]
[0017]
FIG. 1 is a schematic view of a first embodiment of a honeycomb body. FIG. 2 is a schematic view of a second embodiment of a honeycomb body in an exhaust device.
[0018]
DESCRIPTION OF SYMBOLS 1 Honeycomb body 2 Inlet range 3 Outlet range 4 Passage 5 Outer tube 6 Thermal conductivity reduction part 7 Notch opening 8 Passage wall part 9 Notch opening 10 Thermal conductivity reduction part 11 and 12 Thermal conductivity reduction part 13 and 14 Thermal conductivity reducing portion 15 Insulating material 16 Outer jacket tube 17 Diffuser 18 Confuser

Claims (6)

流体が貫流できる通路（４）によって互いに接続されている入口範囲（２）と出口範囲（３）とを有し流体で貫流されるハニカム体（１）において、ハニカム体（１）が入口範囲（２）および出口範囲（３）にのみそれぞれ熱伝導率低減部分（６，１０）を有し、熱伝導率低減部分（６，１０）はハニカム体（１）の横断面全体にわたって延び、熱伝導率低減部分（６，１０）は通路（４）の壁部（８）の切欠き開口（７，９）により形成され、切欠き開口（７，９）はハニカム体（１）の両側端面から間隔を置いてハニカム体（１）の両側端面の後方に設けられ、切欠き開口（７，９）はハニカム体（１）の横断面全体にわたって流体の流れ方向に対して直角に延在していることを特徴とするハニカム体。In a honeycomb body (1) having an inlet range (2) and an outlet range (3) connected to each other by a passage (4) through which a fluid can flow, the honeycomb body (1) has an inlet range ( 2) and the outlet area (3) only have a reduced thermal conductivity part (6, 10), respectively, and the reduced thermal conductivity part (6, 10) extends over the entire cross section of the honeycomb body (1) The rate reducing portion (6, 10) is formed by a notch opening (7, 9) in the wall (8) of the passage (4), and the notch opening (7, 9) is formed from both end faces of the honeycomb body (1). Provided behind the both end faces of the honeycomb body (1) at intervals, the notch openings (7, 9) extend perpendicular to the fluid flow direction over the entire cross section of the honeycomb body (1). A honeycomb body characterized by comprising: 熱伝導率低減部分（６，１０）の少なくとも幾つかの通路（４）の壁部（８）が少なくとも一つの切欠き開口（７，９）を有していることを特徴とする請求項１記載のハニカム体。2. The wall (8) of at least some of the passages (4) of the reduced thermal conductivity portion (6, 10) has at least one notch opening (7, 9). The honeycomb body described. ハニカム体が少なくとも部分的に構造化された板金の巻回ないし積層された層によって形成されていることを特徴とする請求項１または２記載のハニカム体。3. The honeycomb body according to claim 1, wherein the honeycomb body is formed of a wound or laminated layer of at least partially structured sheet metal. ハニカム体が入口範囲（２）および出口範囲（３）の近くにそれぞれ熱伝導率低減部分（１１，１２）を有する外被管（５）内に配置されていることを特徴とする請求項１ないし３のいずれか１つに記載のハニカム体。The honeycomb body is arranged in a jacket tube (5) having a thermal conductivity reducing portion ( 11, 12 ) in the vicinity of the inlet area (2) and the outlet area (3), respectively. The honeycomb body according to any one of Items 3 to 3. 外被管（５）の熱伝導率低減部分（１１，１２）とハニカム体（１）の熱伝導率低減部分（６，１０）とがハニカム体（１）の１つの横断面上に存在していることを特徴とする請求項４記載のハニカム体。The thermal conductivity reduced portion (11, 12) of the outer tube (5) and the thermal conductivity reduced portion (6, 10) of the honeycomb body (1) are present on one transverse section of the honeycomb body (1). The honeycomb body according to claim 4, wherein the honeycomb body is provided. 外被管（５）の熱伝導率低減部分（１１，１２）が切欠き開口（１３，１４）によって形成されていることを特徴とする請求項４又は５記載のハニカム体。The honeycomb body according to claim 4 or 5, characterized in that the heat conductivity reducing part (11, 12) of the outer tube (5) is formed by a notch opening (13, 14).
JP51523098A 1996-09-26 1997-09-17 Honeycomb body Expired - Lifetime JP4098363B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19639633A DE19639633A1 (en) 1996-09-26 1996-09-26 Honeycomb body with reduced thermal conductivity in the entry and exit area
DE19639633.6 1996-09-26
PCT/EP1997/005096 WO1998013590A1 (en) 1996-09-26 1997-09-17 Honeycomb body with reduced heat conductivity in inflow and outflow areas

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JP2001500785A JP2001500785A (en) 2001-01-23
JP4098363B2 true JP4098363B2 (en) 2008-06-11

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JP2011194382A (en) * 2010-03-24 2011-10-06 Ngk Insulators Ltd Honeycomb structure
DE102011081493B4 (en) 2011-08-24 2023-05-11 Bayerische Motoren Werke Aktiengesellschaft Catalyst support for a catalyst, catalyst and method of making a catalyst

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DE2549255A1 (en) * 1975-11-04 1977-05-05 Volkswagenwerk Ag CATALYTIC CLEANING SYSTEM FOR COMBUSTION ENGINE EXHAUST GASES
DE8816514U1 (en) 1988-04-25 1989-10-26 Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar Electrically heated catalyst carrier body
DE3822944A1 (en) * 1988-07-07 1990-01-11 Leistritz Ag Exhaust gas catalyst
DE58900964D1 (en) 1988-09-22 1992-04-16 Emitec Emissionstechnologie HONEYCOMB BODY, IN PARTICULAR CATALYST CARRIER BODY, FROM A MULTIPLE NUMBER OF PLAID STACKS.
DE8812762U1 (en) 1988-10-11 1989-06-29 Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar Catalyst with double jacket system
JPH0634927B2 (en) * 1989-11-16 1994-05-11 トヨタ自動車株式会社 Metal carrier for exhaust gas purification catalyst
JPH08103664A (en) * 1994-10-04 1996-04-23 Nippondenso Co Ltd Honeycomb body and catalytic converter having catalyst carrier consisting of the honeycomb body
US5549873A (en) * 1994-02-18 1996-08-27 Volkswagen Ag Exhaust gas converter arrangement
JP3926382B2 (en) * 1994-09-26 2007-06-06 エミテク・ゲゼルシャフト・フュール・エミシオーンテクノロギー・ミット・ベシュレンクテル・ハフツング Honeycomb body with cross-structured microstructure
DE4437718A1 (en) * 1994-10-21 1996-04-25 Emitec Emissionstechnologie Catalyst carrier body with an inner insulation

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EP0929739A1 (en) 1999-07-21
JP2001500785A (en) 2001-01-23
KR20000048657A (en) 2000-07-25
DE19639633A1 (en) 1998-04-02
AU4623697A (en) 1998-04-17
WO1998013590A1 (en) 1998-04-02
KR100307076B1 (en) 2001-09-24
DE59705700D1 (en) 2002-01-17

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