EP0757163A1 - Carter de catalyseur - Google Patents

Carter de catalyseur Download PDF

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Publication number
EP0757163A1
EP0757163A1 EP96112584A EP96112584A EP0757163A1 EP 0757163 A1 EP0757163 A1 EP 0757163A1 EP 96112584 A EP96112584 A EP 96112584A EP 96112584 A EP96112584 A EP 96112584A EP 0757163 A1 EP0757163 A1 EP 0757163A1
Authority
EP
European Patent Office
Prior art keywords
funnels
exhaust
tube
exhaust gas
dividing line
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.)
Withdrawn
Application number
EP96112584A
Other languages
German (de)
English (en)
Inventor
Hermann Ermer
Apostolos Kourtidis
Walter Dr. Stoepler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leistritz AG and Co Abgastechnik
Original Assignee
Leistritz AG and Co Abgastechnik
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Leistritz AG and Co Abgastechnik filed Critical Leistritz AG and Co Abgastechnik
Publication of EP0757163A1 publication Critical patent/EP0757163A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/011—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 two or more purifying devices arranged in parallel
    • F01N13/017—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 two or more purifying devices arranged in parallel the purifying devices are arranged in a single 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
    • 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
    • F01N3/2857—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 the mats or gaskets being at least partially made of intumescent material, e.g. unexpanded vermiculite
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/16—Plurality of inlet tubes, e.g. discharging into different chambers

Definitions

  • the invention relates to a catalyst housing for multi-flow, in particular double-flow exhaust systems.
  • a separate exhaust line from the outlet of a cylinder to the end of the exhaust system, if possible, in order to oppose the lowest possible resistance to the exhaust gas flow.
  • the exhaust gases of several cylinders are brought together in a common exhaust line. In this common exhaust line, the exhaust gases flow through the entire exhaust system with their catalysts and silencers. The exhaust gases are brought together in a pant-like tube, the two tube ends corresponding to the pant legs of which are assigned to individual cylinders.
  • the flow cross-section of the exhaust gas line changes in the transition area from the two partial lines corresponding to the trouser legs to the common exhaust line.
  • a pressure wave generated by the exhaust gas flow from one sub-branch runs back into the adjacent sub-branch. This is not a problem if the adjacent partial strand itself is not acted upon by an exhaust gas stream at the moment the returning shaft enters. Otherwise, the returning wave would at least impede the outflow of the exhaust gas flow, in extreme cases even completely prevent the decompression of the adjacent cylinder.
  • catalysts in particular pre- or starting catalysts, as close as possible to the cylinder outlet. This attachment close to the engine ensures that the catalytic converter heats up quickly due to the exhaust gases flowing through it. The warmer the exhaust gases flowing through the catalyst, the faster the catalyst heats up. The catalyst only achieves its full effect when it is heated up.
  • the use of a single catalytic converter housing has the advantage that the resulting unit is smaller than would be the case if two separate catalytic converter housings were used.
  • the use of only one catalyst housing that is to say a single sheet metal jacket for a single monolith, has the advantage that the weight of the catalyst is significantly reduced. Because of the reduced effective mass, the temperature radiation from the catalyst housing is also effectively reduced. By reducing the temperature radiation, the thermal behavior of the catalyst is improved in that it is faster starts ", so it reaches its operating temperature faster, i.e. its full performance.
  • the use of only one housing has the advantage that little material is required, which lowers the material costs.
  • a single part is easier to transport in production. Only one part has to be transported, installed and packed.
  • the invention has for its object to design an exhaust gas catalytic converter so that it is as space-saving as possible and at the same time has a high thermal load capacity.
  • the solution to the problem consists in an extension of the dividing line between the two adjacent exhaust pipes and the inevitably associated enlargement of the separating area on the one hand and the distribution of the temperature gradient over as many exhaust gas channels of the honeycomb-like structured monolith on the other.
  • the dividing line between the two exhaust gas lines has an essentially odd course.
  • This odd course of the dividing line also has the advantage that less thermal stress occurs along the dividing line.
  • an odd dividing line has the advantage that, in contrast to a straight dividing line, there is no expansion of the housing in the region of the dividing line, which results in a voltage drop in the swelling mat holding the ceramic monoliths in the housing. A voltage drop in the source mat must be prevented simply because otherwise the catalytic converter will fail completely is preprogrammed ".
  • An S-shaped or a sinusoidal course of the dividing line between the two flows of the exhaust line is particularly advantageous.
  • the exhaust lines or the exhaust gas flows of the exhaust system in the areas outside the one-piece catalytic converter block are usually cylindrical.
  • the cylindrical tubes then open into D-shaped funnels according to the prior art or into funnels with a curved dividing line according to the invention, preferably into funnels with a sinusoidal dividing line.
  • the funnels are in turn connected to the catalyst housing.
  • the exhaust gas streams flow from the individual floods into the catalytic converter housing and the monoliths arranged therein, flow through the monolith in the individual channels that form the honeycomb structure of the monolith and flow out into conventional exhaust pipes via two further funnels adapted at the catalytic converter outlet.
  • exhaust pipes with a sinusoidal dividing line also has the advantage that two planes of symmetry are present, so that two identical funnels can be rotated next to each other by 180 °. Only a single funnel tool is then required to manufacture the funnels, which advantageously reduces the tool costs.
  • the funnels 2 connect to the exhaust pipes (not shown in the drawings) in the direction of flow 1.
  • the funnels 2 have cylindrical pipe sections 3 for the cylindrical exhaust pipes. In the flow direction 1 next to the pipe sections 3, the funnels 2 expand.
  • the funnels 2 have a semi-oval outer skin 4 in those areas in which they do not touch each other.
  • the funnels 2 also form the S-shaped or sinusoidal dividing line 5 with one another.
  • FIGS. 3 and 4 it is possible to arrange an essentially cylindrical main catalytic converter in the area of the engine compartment.
  • two manifold outlets each open into a single, cylindrical exhaust pipe with a partition in the direction of flow.
  • This exhaust pipe is connected to the cylindrical pipe section 3 in FIG. 3.
  • the pipe section 3 for the exhaust pipe which is divided in two by means of a partition, is still flanked by a fixing flange 7.
  • the funnel 2 also widens in the flow direction 1 in this embodiment.
  • the flow channel is initially divided into two parts by a straight partition 6 aligned with the partition in the exhaust pipe.
  • the partition 6 is also S-shaped in the further course.
  • the partition 6 is thus deformed into a sinusoidal dividing line 5. This is clearly visible in the area of the funnel outlet 8 shown in FIG. 4. In the direction of flow 1, the sheet metal jacket 9 of the actual catalyst housing adjoins the funnel outlet 8. The monolith, which cannot be seen in the drawings, is held in the sheet metal jacket 9 by the swelling mat 10.
  • partition plates in particular tend to flutter at high temperatures around 1000 ° C., which is disadvantageous in terms of noise and in particular affects the strength of the catalyst because can destroy the divider 6 itself by fluttering. This self-destructive effect due to the flutter is effectively avoided by the sinusoidal design of the S-shaped separating plate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
EP96112584A 1995-08-04 1996-08-03 Carter de catalyseur Withdrawn EP0757163A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29513179U 1995-08-04
DE29513179 1995-08-04

Publications (1)

Publication Number Publication Date
EP0757163A1 true EP0757163A1 (fr) 1997-02-05

Family

ID=8011852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96112584A Withdrawn EP0757163A1 (fr) 1995-08-04 1996-08-03 Carter de catalyseur

Country Status (1)

Country Link
EP (1) EP0757163A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1482141A1 (fr) * 2003-05-28 2004-12-01 J. Eberspächer GmbH & Co. KG Système de gaz d'échappement pour véhicule automobile à moteur thermique
DE102012017178A1 (de) * 2012-03-10 2013-09-12 Volkswagen Aktiengesellschaft Abgasreinigungsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7045505U (de) * 1971-04-08 Boysen F Rohrverbindung, insbesondere fur ein Abgassystem
DE2725943A1 (de) * 1977-06-08 1978-12-21 Daimler Benz Ag Katalysator
DE2745841A1 (de) * 1977-10-12 1979-04-19 Eberspaecher J Auspufftopf mit katalysator-monolithen
US5148597A (en) * 1990-08-27 1992-09-22 Tennessee Gas Pipeline Company Method of making a collector device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7045505U (de) * 1971-04-08 Boysen F Rohrverbindung, insbesondere fur ein Abgassystem
DE2725943A1 (de) * 1977-06-08 1978-12-21 Daimler Benz Ag Katalysator
DE2745841A1 (de) * 1977-10-12 1979-04-19 Eberspaecher J Auspufftopf mit katalysator-monolithen
US5148597A (en) * 1990-08-27 1992-09-22 Tennessee Gas Pipeline Company Method of making a collector device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1482141A1 (fr) * 2003-05-28 2004-12-01 J. Eberspächer GmbH & Co. KG Système de gaz d'échappement pour véhicule automobile à moteur thermique
DE102012017178A1 (de) * 2012-03-10 2013-09-12 Volkswagen Aktiengesellschaft Abgasreinigungsvorrichtung

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