EP0243951A1 - A method for encasing a catalytic unit used for the purification of exhaust gases - Google Patents

A method for encasing a catalytic unit used for the purification of exhaust gases Download PDF

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Publication number
EP0243951A1
EP0243951A1 EP87106248A EP87106248A EP0243951A1 EP 0243951 A1 EP0243951 A1 EP 0243951A1 EP 87106248 A EP87106248 A EP 87106248A EP 87106248 A EP87106248 A EP 87106248A EP 0243951 A1 EP0243951 A1 EP 0243951A1
Authority
EP
European Patent Office
Prior art keywords
tube
unit
catalytic unit
catalytic
encasing
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Withdrawn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
EP87106248A
Other languages
German (de)
French (fr)
Inventor
Kauko Kanniainen
Veikko Loukeinen
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.)
Kemira Oyj
Original Assignee
Kemira Oyj
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 Kemira Oyj filed Critical Kemira Oyj
Publication of EP0243951A1 publication Critical patent/EP0243951A1/en
Withdrawn legal-status Critical Current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
    • 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
    • F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/02—Fitting monolithic blocks into the 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing

Definitions

  • the present invention relates to a method for encasing a catalytic unit used for the purification of exhaust gases, in which method the outer casing parts are fitted around at least one cell, whereafter the outer casing parts are secured together in order to form a jacket around the cell.
  • U.S. Patent 4,328,188 discloses an encasing method in which the jacket which constitutes the outer casing of the catalytic unit is made up of a pair of shells welded together along their edges. Longitudinal movement of the catalytic unit is prevented by forming in the shells a shoulder in which the unit fits and by securing the unit firmly by using separate retaining means welded to the casing.
  • the separate retaining means may be a simple flange. It is necessary additionally to dispose between the jacket and the unit some resilient material, such as matting woven from steel wire or heat-resistant felt, so that the unit will not be damaged. Possible disadvantages due to thermal expansion are thereby also prevented.
  • U.S. Patent 4,400,860 discloses a method for encasing a metal unit, in which method the unit is placed between two casing halves which are pressed together and welded at the seam areas. The unit and the jacket are welded together by spot welding or by brazing.
  • the two shells have been replaced by a tube and two end cones.
  • the catalytic unit can be adjusted to fit different makes and models of automobiles simply by altering the length or the diameter of the tube and by changing the end cones, which is easy and inexpensive to do.
  • the tube used can be, for example, standard steel tube and the end cones can be made by using relatively inexpensive press tools.
  • the cross-sectional configuration of the tube used as the jacket of the catalytic unit can vary from round to oval, and so the best possible alternative can be found for each automobile make. However, a tube of round cross-sectional configuration is usually the best and easiest structural solution.
  • the method according to the invention for encasing a catalytic unit can thus be easily varied and is adaptable also to small-scale manufacture.
  • the catalytic units made of metal, used in the method withstand without breaking the mechanical stresses possibly present during both the encasing stage and use. Thus no resilient material is needed between the jacket and the unit, as is required with ceramic units, and this decreases the size of the catalyst and reduces the costs of manufacture and material.
  • the unit is placed in the tube, the beginning of which can selectively in advance be shaped as a cone, whereafter one or both ends of the tube are pressed into cone shape, whereby the unit pushed inside the tube is immobilized inside the jacket. Thereafter, suitable end cones are welded to the ends of the tube and the encased catalytic unit is ready.
  • one or two inward oriented grooves are formed in the metal tube, and two metal units are placed in the tube, one end of each catalytic unit being held in place by the groove/grooves formed in the tube.
  • Figure 1 shows a metal tube (2) having one end shaped into a cone (3). Inside the tube there is placed a catalytic unit (1). Thereafter the straight end of the tube is shaped into a cone and the end cones (4) are secured to the ends of the tube.
  • Figure 2 shows a metal tube (2) with two catalytic units (1) placed inside it.
  • the cells are immobilized at the open ends of the tube by shaping the ends of the tube into cones (3), and the inner ends of the catalytic units are held in place by grooves (5) formed inward in the tube.
  • the end cones (4) are secured to the ends of the tube.

Abstract

The invention relates to a method for encasing a catalytic unit (1) used for purifying exhaust gases, in which method the unit is placed inside a tube (2) and the ends of the tube are shaped into cones (3), whereby the catalytic unit (1) is secured at its ends to the outer jacket, and thereafter end cones (4) are fastened to the ends of the tube.

Description

  • The present invention relates to a method for encasing a catalytic unit used for the purification of exhaust gases, in which method the outer casing parts are fitted around at least one cell, whereafter the outer casing parts are secured together in order to form a jacket around the cell.
  • The catalytic units currently used are mainly ceramic, and therefore their encasing requires special precision and caution, owing to the brittleness of ceramic units. U.S. Patent 4,328,188 discloses an encasing method in which the jacket which constitutes the outer casing of the catalytic unit is made up of a pair of shells welded together along their edges. Longitudinal movement of the catalytic unit is prevented by forming in the shells a shoulder in which the unit fits and by securing the unit firmly by using separate retaining means welded to the casing. The separate retaining means may be a simple flange. It is necessary additionally to dispose between the jacket and the unit some resilient material, such as matting woven from steel wire or heat-resistant felt, so that the unit will not be damaged. Possible disadvantages due to thermal expansion are thereby also prevented.
  • U.S. Patent 4,400,860 discloses a method for encasing a metal unit, in which method the unit is placed between two casing halves which are pressed together and welded at the seam areas. The unit and the jacket are welded together by spot welding or by brazing.
  • In previously known methods it is necessary to use expensive press tools for preparing the casing halves, and if it is desired to change the size of the catalytic unit, new tools are always necessary, which results in high costs. In order to keep the costs at a moderate level, the known methods require large-­scale manufacture in order to be profitable. However, since there are many makes and models of automobiles and since the same type of catalytic unit cannot be installed in all makes, the adjustability of the casing should be easy without incurring high costs of tooling.
  • It is the object of the present invention to provide a method for encasing catalytic units, without the disadvantages of previously known methods. This is achieved in accordance with the invention by fitting a catalytic unit, preferably of metal, inside a tube, preferably a metal tube, the beginning of which has selectively in advance been shaped into a cone, in which case the unit placed inside the tube is secured at its ends to the outer mantle, and thereafter suitable end cones are secured to the ends of the tube.
  • In the encasing method according to the invention, the two shells have been replaced by a tube and two end cones. The catalytic unit can be adjusted to fit different makes and models of automobiles simply by altering the length or the diameter of the tube and by changing the end cones, which is easy and inexpensive to do.
  • The tube used can be, for example, standard steel tube and the end cones can be made by using relatively inexpensive press tools. The cross-sectional configuration of the tube used as the jacket of the catalytic unit can vary from round to oval, and so the best possible alternative can be found for each automobile make. However, a tube of round cross-sectional configuration is usually the best and easiest structural solution. The method according to the invention for encasing a catalytic unit can thus be easily varied and is adaptable also to small-scale manufacture.
  • The catalytic units, made of metal, used in the method withstand without breaking the mechanical stresses possibly present during both the encasing stage and use. Thus no resilient material is needed between the jacket and the unit, as is required with ceramic units, and this decreases the size of the catalyst and reduces the costs of manufacture and material.
  • Longitudinal movement of the catalytic unit inside the casing can be prevented in a simple manner by the method according to the invention. The unit is placed in the tube, the beginning of which can selectively in advance be shaped as a cone, whereafter one or both ends of the tube are pressed into cone shape, whereby the unit pushed inside the tube is immobilized inside the jacket. Thereafter, suitable end cones are welded to the ends of the tube and the encased catalytic unit is ready.
  • According to one embodiment of the invention, one or two inward oriented grooves are formed in the metal tube, and two metal units are placed in the tube, one end of each catalytic unit being held in place by the groove/grooves formed in the tube.
  • It is, of course, also possible to place more than two catalytic units in a tube, in which case these units are retained at both ends by means of grooves formed in the tube.
  • The invention is illustrated below with reference to the accompanying drawings, in which
    • Figure 1 depicts the encasing method according to the invention, using one catalytic unit, and
    • Figure 2 depicts an embodiment of the invention, using two catalytic units.
  • Figure 1 shows a metal tube (2) having one end shaped into a cone (3). Inside the tube there is placed a catalytic unit (1). Thereafter the straight end of the tube is shaped into a cone and the end cones (4) are secured to the ends of the tube.
  • Figure 2 shows a metal tube (2) with two catalytic units (1) placed inside it. The cells are immobilized at the open ends of the tube by shaping the ends of the tube into cones (3), and the inner ends of the catalytic units are held in place by grooves (5) formed inward in the tube. In the last phase of the method, the end cones (4) are secured to the ends of the tube.

Claims (4)

1. A method for encasing a catalytic unit used for purifying exhaust gases, in which method the casing parts are fitted around at least one catalytic unit, whereafter the casing parts are secured together in order to form a jacket around the unit, characterized in that a metal catalytic unit (1) is placed inside a tube (2), the beginning of the tube having selectively been shaped into a cone (3) in advance, and then the other or both ends of the tube are shaped into cones (3), whereby the catalytic unit fitted inside the tube is secured at its ends to the outer jacket, and thereafter suitable end cones (4) are secured to the ends of the tube, the end cones covering only the tube ends which have been shaped into cones.
2. A method according to Claim l, characterized in that one or two inward oriented grooves (5) are formed in the tube (2), and two catalytic units (1) are placed in the tube, one end of each unit being retained by the groove/grooves (5) formed in the tube.
3. A method according to Claim 1 or 2, characterized in that the tube (2) is oval.
4. A method according to any of Claims 1-3, characterized in that the tube is of metal and that the metal end cones are secured by welding.
EP87106248A 1986-04-29 1987-04-29 A method for encasing a catalytic unit used for the purification of exhaust gases Withdrawn EP0243951A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI861800 1986-04-29
FI861800A FI74522C (en) 1986-04-29 1986-04-29 FOERFARANDE FOER INKAPSLING AV EN KATALYTCELL AVSEDD FOER RENING AV AVGAS.

Publications (1)

Publication Number Publication Date
EP0243951A1 true EP0243951A1 (en) 1987-11-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106248A Withdrawn EP0243951A1 (en) 1986-04-29 1987-04-29 A method for encasing a catalytic unit used for the purification of exhaust gases

Country Status (3)

Country Link
EP (1) EP0243951A1 (en)
AU (1) AU590702B2 (en)
FI (1) FI74522C (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0425983A1 (en) * 1989-10-23 1991-05-08 Arvin Industries, Inc. Exhaust processor with sized ends
US5331810A (en) * 1992-05-21 1994-07-26 Arvin Industries, Inc. Low thermal capacitance exhaust system for an internal combustion engine
EP0818615A3 (en) * 1996-07-10 1998-04-15 Volkswagen Aktiengesellschaft Catalyst housing
EP1205649A1 (en) * 2000-11-10 2002-05-15 Volkswagen Aktiengesellschaft Metal catalyst for an exhaust system
EP1277931A2 (en) * 2001-07-18 2003-01-22 J. Eberspächer GmbH & Co. KG Connection between an exhaust pipe and exhaust casing of a vehicle
DE102004052538A1 (en) * 2004-10-28 2006-05-04 Emitec Gesellschaft Für Emissionstechnologie Mbh Honeycomb body used as a catalyst carrier body in a vehicle exhaust gas system comprises a casing tube having partial regions each with an inner diameter in the longitudinal direction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2009396C (en) * 1989-02-06 1995-03-28 James Robert Abbott Catalytic converter with one piece housing

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2179257A1 (en) * 1972-04-07 1973-11-16 Kali Chemie Ag
FR2214041A1 (en) * 1973-01-13 1974-08-09 Ti Silencer Services Ltd
US3892537A (en) * 1973-11-28 1975-07-01 Corning Glass Works Preload means for ceramic substrate in exhaust gas purifiers
DE2364425A1 (en) * 1973-12-22 1975-07-10 Boysen Friedrich Kg Catalyst chamber construction - for a monolithic catalyst used in after-burning of unburnt constituents in exhaust gases
US3975826A (en) * 1971-12-14 1976-08-24 Tenneco Inc. Catalytic converter for exhaust gases
DE3010633A1 (en) * 1980-03-20 1981-09-24 Volkswagenwerk Ag, 3180 Wolfsburg End-fixing for IC engine afterburner metal catalyst-carrier - is installed in casing peripheral creases are formed in casing with carrier inserted
GB1602991A (en) * 1978-05-20 1981-11-18 British Leyland Cars Ltd Catalytic converters for internal combustion engines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2856030A1 (en) * 1978-12-23 1980-06-26 Sueddeutsche Kuehler Behr CARTRIDGE FOR EXHAUST GAS PURIFICATION
US4250146A (en) * 1979-10-05 1981-02-10 Uop Inc. Caseless monolithic catalytic converter
US4269807A (en) * 1979-10-22 1981-05-26 Uop Inc. Catalytic converter mounting arrangement for reducing bypass leakage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975826A (en) * 1971-12-14 1976-08-24 Tenneco Inc. Catalytic converter for exhaust gases
FR2179257A1 (en) * 1972-04-07 1973-11-16 Kali Chemie Ag
FR2214041A1 (en) * 1973-01-13 1974-08-09 Ti Silencer Services Ltd
US3892537A (en) * 1973-11-28 1975-07-01 Corning Glass Works Preload means for ceramic substrate in exhaust gas purifiers
DE2364425A1 (en) * 1973-12-22 1975-07-10 Boysen Friedrich Kg Catalyst chamber construction - for a monolithic catalyst used in after-burning of unburnt constituents in exhaust gases
GB1602991A (en) * 1978-05-20 1981-11-18 British Leyland Cars Ltd Catalytic converters for internal combustion engines
DE3010633A1 (en) * 1980-03-20 1981-09-24 Volkswagenwerk Ag, 3180 Wolfsburg End-fixing for IC engine afterburner metal catalyst-carrier - is installed in casing peripheral creases are formed in casing with carrier inserted

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0425983A1 (en) * 1989-10-23 1991-05-08 Arvin Industries, Inc. Exhaust processor with sized ends
US5331810A (en) * 1992-05-21 1994-07-26 Arvin Industries, Inc. Low thermal capacitance exhaust system for an internal combustion engine
EP0818615A3 (en) * 1996-07-10 1998-04-15 Volkswagen Aktiengesellschaft Catalyst housing
US6185819B1 (en) 1996-07-10 2001-02-13 Volkswagen Ag Catalytic converter housing arrangement
EP1205649A1 (en) * 2000-11-10 2002-05-15 Volkswagen Aktiengesellschaft Metal catalyst for an exhaust system
DE10055728A1 (en) * 2000-11-10 2002-05-23 Volkswagen Ag Metal catalytic converter for an exhaust system
EP1277931A2 (en) * 2001-07-18 2003-01-22 J. Eberspächer GmbH & Co. KG Connection between an exhaust pipe and exhaust casing of a vehicle
EP1277931A3 (en) * 2001-07-18 2003-05-28 J. Eberspächer GmbH & Co. KG Connection between an exhaust pipe and exhaust casing of a vehicle
DE102004052538A1 (en) * 2004-10-28 2006-05-04 Emitec Gesellschaft Für Emissionstechnologie Mbh Honeycomb body used as a catalyst carrier body in a vehicle exhaust gas system comprises a casing tube having partial regions each with an inner diameter in the longitudinal direction

Also Published As

Publication number Publication date
AU590702B2 (en) 1989-11-09
FI861800A0 (en) 1986-04-29
FI74522B (en) 1987-10-30
AU7171087A (en) 1988-11-17
FI74522C (en) 1988-02-08

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Inventor name: LOUKEINEN, VEIKKO

Inventor name: KANNIAINEN, KAUKO