WO2006020211A2 - Catalytic converter and associated method of assembly - Google Patents

Catalytic converter and associated method of assembly Download PDF

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Publication number
WO2006020211A2
WO2006020211A2 PCT/US2005/025411 US2005025411W WO2006020211A2 WO 2006020211 A2 WO2006020211 A2 WO 2006020211A2 US 2005025411 W US2005025411 W US 2005025411W WO 2006020211 A2 WO2006020211 A2 WO 2006020211A2
Authority
WO
WIPO (PCT)
Prior art keywords
intermediate portion
side portion
inner tube
heat shield
diameter
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.)
Ceased
Application number
PCT/US2005/025411
Other languages
French (fr)
Other versions
WO2006020211A3 (en
Inventor
Peter Kroner
James R. Bowman
Kevin Barnard
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.)
Arvin Technologies Inc
Original Assignee
Arvin Technologies Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=35732424&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2006020211(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Arvin Technologies Inc filed Critical Arvin Technologies Inc
Priority to EP05773234.9A priority Critical patent/EP1787017B2/en
Publication of WO2006020211A2 publication Critical patent/WO2006020211A2/en
Anticipated expiration legal-status Critical
Publication of WO2006020211A3 publication Critical patent/WO2006020211A3/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • 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
    • 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
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • 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
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • 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
    • 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
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/08—Exhaust treating devices having provisions not otherwise provided for for preventing heat loss or temperature drop, using other means than layers of heat-insulating material
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • 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
    • F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
    • F01N2350/02—Fitting ceramic monoliths in a metallic housing
    • F01N2350/04—Fitting ceramic monoliths in a metallic housing with means compensating thermal expansion
    • 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 exhaust gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/26—Multi-layered walls
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49345—Catalytic device making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49361—Tube inside tube
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53652—Tube and coextensive core

Definitions

  • the present disclosure relates to catalytic converters.
  • Catalytic converters are used to treat emissions present in exhaust gas discharged from an engine or other producer of exhaust gas. Such emissions may include, for example, carbon monoxide (CO), unburned hydrocarbons (HC), and nitrogen oxides (NO x ).
  • the catalytic converter may be used to convert CO to carbon dioxide (CO 2 ), HC to water (H 2 O), and NO x ) to nitrogen before discharge of the exhaust gas to the atmosphere.
  • a catalytic converter comprises an outer tube formed without any weld, first and second catalyzed substrates, and a tubular heat shield.
  • the first catalyzed substrate is secured in a tubular first side portion of the outer tube.
  • the second catalyzed substrate is secured in a tubular second side portion of the outer tube.
  • the head shield is positioned in a tubular intermediate portion located between the first and second side portions to inhibit transfer of heat from exhaust gas present in the intermediate portion to the intermediate portion.
  • An oxygen sensor is secured to the intermediate portion to sense the oxygen content of the exhaust gas located between the catalyzed substrates.
  • a diameter of the first side portion is reduced to secure the first catalyzed substrate in the first side portion and a diameter of the second side portion is reduced to secure the second catalyzed substrate in the second side portion.
  • Such diameter reduction of one or both of the first and second side portions occurs after insertion of the heat shield into the intermediate portion.
  • Fig. 1 is a longitudinal sectional view of a catalytic converter showing a first heat shield and an oxygen sensor secured to a tubular intermediate portion of an outer tube and first and second catalyzed substrates secured to reduced-diameter tubular side portions of the outer tube;
  • Fig. 2 is a transverse sectional view taken along lines 2-2 of Fig. 1 showing standoffs of an inner tube of the first heat shield secured to the intermediate portion and a insulation layer of the first heat shield located between the inner tube and the intermediate portion;
  • Fig. 3 is an enlarged view of region A of Fig. 1 showing the insulation layer located between the inner tube and the intermediate portion;
  • Fig. 4 is a view similar to Fig. 3 showing an air gap between the inner tube and the intermediate portion;
  • Fig. 5 is a longitudinal sectional view similar to Fig. 1 showing an inner tube of a second heat shield located in the intermediate portion and secured to the outer tube upon reduction of the diameter of the first and second side portions;
  • Fig. 6 is a transverse sectional view taken along lines 6-6 of Fig. 5; and Fig. 7 is an enlarged view of region B of Fig. 5.
  • a catalytic converter 10 is configured for treating emissions present in exhaust gas discharged from an engine (not shown) or other exhaust gas producer.
  • Converter 10 is used, for example, to convert CO to CO 2 , HC to H 2 O, and NO x to nitrogen.
  • Converter 10 comprises a housing 12, first and second catalyzed substrates 14, 16, a tubular heat shield 18, and an oxygen sensor 20.
  • Catalyzed substrates 14, 16 are configured to treat the emissions in the exhaust gas.
  • Each catalyzed substrate 14, 16 comprises a substrate that is made of, for example, a ceramic material such as cordierite and is coated with a catalyst such as platinum, palladium, and/or rhodium.
  • Substrate 14 is secured in a tubular first side portion 22 of an outer tube 24 of housing 12 by use of, for example, a first support mat 26 positioned between substrate 14 and first side portion 22 and made of intumescent or fiberglass material.
  • Substrate 16 is secured in a tubular second side portion 28 of outer tube 24 by use of, for example, a second support mat 30 positioned between substrate 16 and second side portion 28 and made of intumescent or fiberglass material.
  • Heat shield 18 is positioned in a tubular intermediate portion 32 of outer tube 24 around a longitudinal axis 34 of outer tube 24 to inhibit transfer of heat from exhaust gas present in intermediate portion 32 to intermediate portion 32.
  • Oxygen sensor 20 is secured to intermediate portion 32 by use of, for example, a sensor mount 36 welded to intermediate portion 32 to sense the oxygen content of exhaust gas present between substrates 14, 16.
  • Each of side portions 22, 28 has a diameter smaller than a diameter of intermediate portion 32.
  • the diameter of each of side portions 22, 28 is reduced during assembly of converter 10 to secure substrates 14, 16 in side portions 22, 28.
  • End caps 38 are secured to side portions 22, 28.
  • outer tube 34 and end caps 38 provide housing 12.
  • end caps 38 are welded to outer tube 24. It is within the scope of this disclosure for one or both of end caps 38 to be formed as a one-piece construction with outer tube 34.
  • heat shield 18 comprises an inner tube 40 and a tubular insulation layer 42 positioned between inner tube 40 and intermediate portion. It is within the scope of this disclosure for layer 42 to be omitted from heat shield 18, as shown, for example, in Fig. 4.
  • Inner tube 40 comprises a tubular main body 44, a plurality (e.g., three) of standoffs 46, and opposite end portions 48, as shown, for example, in Figs. 1 and 2.
  • Standoffs 46 extend radially outwardly from main body 44 to intermediate portion 32 and are secured to intermediate portion 32 by, for example, spot-welding.
  • End portions 48 taper radially inwardly from main body 44 to accommodate the difference in diameter between intermediate portion 32 and first and second side portions 22, 28.
  • An aperture 50 defined in main body 44 receives sensor mount 36 to facilitate sensing of oxygen by oxygen sensor 20.
  • the diameter of side portions 22, 28 is initially the same as the diameter of intermediate portion 32.
  • outer tube 24 is initially cylindrical and has no welds.
  • Heat shield 18 is inserted through one of side portions 22, 28 into intermediate portion 32 and secured to intermediate portion 32.
  • insulation layer 42 is positioned on inner tube 40 before heat shield 18 is inserted into intermediate portion 32.
  • Standoffs 46 are spot-welded to intermediate portion 32 to secure heat shield 18 in place.
  • Catalyzed substrates 14, 16 are inserted into side portions 22, 28. First catalyzed substrate 14 is inserted into first side portion 22 and second catalyzed substrate 16 is inserted into second side portion 28.
  • Each side portion 22, 28 is swaged or otherwise deformed radially inwardly as indicated by arrows 52 from an initial undeformed position shown in phantom in Fig. 1 to a deformed position shown in solid in Fig. 1 to reduce the diameter of each side portion 22, 28.
  • Such diameter reduction of side portions 22, 28 compresses support mats 26, 30 against substrates 14, 16 to hold substrates 14, 16 in place in side portions 22, 28.
  • the diameter of each of side portions 22, 28 may be reduced in this manner after insertion of heat shield 18 into intermediate portion 32. In other cases, the diameter of one of side portions 22, 28 may be reduced before insertion of heat shield 18 into intermediate portion 32 and the diameter of the other side portion 22, 28 may be reduced after insertion of heat shield 18 into intermediate portion 32.
  • Sensor mount 36 may be secured to intermediate portion 32 and oxygen sensor 20 may be secured to mount 36 before or after reduction of the diameter of side portions 22, 28.
  • converter 10 comprises a heat shield 118 in place of heat shield 18.
  • Heat shield 118 is secured to outer tube 24 in a manner different from the way heat shield 18 is secured to outer tube 24.
  • heat shield 118 is secured to outer tube 24 as a result of reduction of the diameter of side portions 22, 28.
  • Heat shield 118 comprises an inner tube 140 and a tubular insulation layer 142 positioned between inner tube 140 and intermediate portion 32.
  • Inner tube 140 comprises a main body 144 and opposite first and second end portions 148a,
  • tubular tubular
  • diameter tubular
  • cylindrical tubular
  • tubular tubular
  • diameter tubular
  • cylindrical tubular
  • tubular tubular
  • oval oval
  • rectangular tubular
  • other closed curve cross-sectional shapes While the concepts of the present disclosure have been illustrated and described in detail in the drawings and foregoing description, such an illustration and description is to be considered as exemplary and not restrictive in character, it being understood that only the illustrative embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A catalytic converter (10) comprises an outer tube (24), a pair of catalyzed substrates (14,16) positioned in the outer tube, and a heat shield (18) positioned in the outer tube between the catalyzed substrates. A method of assembling the catalytic converter is also disclosed.

Description

CATALYTIC CONVERTER AND ASSOCIATED METHOD OF ASSEMBLY
FIELD OF THE DISCLOSURE
The present disclosure relates to catalytic converters.
BACKGROUND OF THE DISCLOSURE Catalytic converters are used to treat emissions present in exhaust gas discharged from an engine or other producer of exhaust gas. Such emissions may include, for example, carbon monoxide (CO), unburned hydrocarbons (HC), and nitrogen oxides (NOx). The catalytic converter may be used to convert CO to carbon dioxide (CO2), HC to water (H2O), and NOx) to nitrogen before discharge of the exhaust gas to the atmosphere.
SUMMARY OF THE DISCLOSURE
According to aspect of the present disclosure, a catalytic converter comprises an outer tube formed without any weld, first and second catalyzed substrates, and a tubular heat shield. The first catalyzed substrate is secured in a tubular first side portion of the outer tube. The second catalyzed substrate is secured in a tubular second side portion of the outer tube. The head shield is positioned in a tubular intermediate portion located between the first and second side portions to inhibit transfer of heat from exhaust gas present in the intermediate portion to the intermediate portion. An oxygen sensor is secured to the intermediate portion to sense the oxygen content of the exhaust gas located between the catalyzed substrates.
According to an aspect of a method of assembling the catalytic converter, a diameter of the first side portion is reduced to secure the first catalyzed substrate in the first side portion and a diameter of the second side portion is reduced to secure the second catalyzed substrate in the second side portion. Such diameter reduction of one or both of the first and second side portions occurs after insertion of the heat shield into the intermediate portion.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal sectional view of a catalytic converter showing a first heat shield and an oxygen sensor secured to a tubular intermediate portion of an outer tube and first and second catalyzed substrates secured to reduced-diameter tubular side portions of the outer tube;
Fig. 2 is a transverse sectional view taken along lines 2-2 of Fig. 1 showing standoffs of an inner tube of the first heat shield secured to the intermediate portion and a insulation layer of the first heat shield located between the inner tube and the intermediate portion;
Fig. 3 is an enlarged view of region A of Fig. 1 showing the insulation layer located between the inner tube and the intermediate portion;
Fig. 4 is a view similar to Fig. 3 showing an air gap between the inner tube and the intermediate portion;
Fig. 5 is a longitudinal sectional view similar to Fig. 1 showing an inner tube of a second heat shield located in the intermediate portion and secured to the outer tube upon reduction of the diameter of the first and second side portions;
Fig. 6 is a transverse sectional view taken along lines 6-6 of Fig. 5; and Fig. 7 is an enlarged view of region B of Fig. 5.
DETAILED DESCRIPTION OF THE DRAWINGS
While the concepts of the present disclosure are susceptible to various modifications and alternative forms, specific exemplary embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the disclosure to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives following within the spirit and scope of the invention as defined by the appended claims.
Referring to Fig. 1, a catalytic converter 10 is configured for treating emissions present in exhaust gas discharged from an engine (not shown) or other exhaust gas producer. Converter 10 is used, for example, to convert CO to CO2, HC to H2O, and NOx to nitrogen.
Converter 10 comprises a housing 12, first and second catalyzed substrates 14, 16, a tubular heat shield 18, and an oxygen sensor 20. Catalyzed substrates 14, 16 are configured to treat the emissions in the exhaust gas. Each catalyzed substrate 14, 16 comprises a substrate that is made of, for example, a ceramic material such as cordierite and is coated with a catalyst such as platinum, palladium, and/or rhodium. Substrate 14 is secured in a tubular first side portion 22 of an outer tube 24 of housing 12 by use of, for example, a first support mat 26 positioned between substrate 14 and first side portion 22 and made of intumescent or fiberglass material. Substrate 16 is secured in a tubular second side portion 28 of outer tube 24 by use of, for example, a second support mat 30 positioned between substrate 16 and second side portion 28 and made of intumescent or fiberglass material. Heat shield 18 is positioned in a tubular intermediate portion 32 of outer tube 24 around a longitudinal axis 34 of outer tube 24 to inhibit transfer of heat from exhaust gas present in intermediate portion 32 to intermediate portion 32. Oxygen sensor 20 is secured to intermediate portion 32 by use of, for example, a sensor mount 36 welded to intermediate portion 32 to sense the oxygen content of exhaust gas present between substrates 14, 16.
Each of side portions 22, 28 has a diameter smaller than a diameter of intermediate portion 32. The diameter of each of side portions 22, 28 is reduced during assembly of converter 10 to secure substrates 14, 16 in side portions 22, 28. End caps 38 are secured to side portions 22, 28. Together, outer tube 34 and end caps 38 provide housing 12. Illustratively, end caps 38 are welded to outer tube 24. It is within the scope of this disclosure for one or both of end caps 38 to be formed as a one-piece construction with outer tube 34. Referring to Figs. 1 -3, heat shield 18 comprises an inner tube 40 and a tubular insulation layer 42 positioned between inner tube 40 and intermediate portion. It is within the scope of this disclosure for layer 42 to be omitted from heat shield 18, as shown, for example, in Fig. 4.
Inner tube 40 comprises a tubular main body 44, a plurality (e.g., three) of standoffs 46, and opposite end portions 48, as shown, for example, in Figs. 1 and 2. Standoffs 46 extend radially outwardly from main body 44 to intermediate portion 32 and are secured to intermediate portion 32 by, for example, spot-welding. End portions 48 taper radially inwardly from main body 44 to accommodate the difference in diameter between intermediate portion 32 and first and second side portions 22, 28. An aperture 50 defined in main body 44 receives sensor mount 36 to facilitate sensing of oxygen by oxygen sensor 20.
During assembly of converter 10 with heat shield 18, the diameter of side portions 22, 28 is initially the same as the diameter of intermediate portion 32. As such, outer tube 24 is initially cylindrical and has no welds. Heat shield 18 is inserted through one of side portions 22, 28 into intermediate portion 32 and secured to intermediate portion 32. When heat shield 18 includes insulation layer 42, insulation layer 42 is positioned on inner tube 40 before heat shield 18 is inserted into intermediate portion 32. Standoffs 46 are spot-welded to intermediate portion 32 to secure heat shield 18 in place. Catalyzed substrates 14, 16 are inserted into side portions 22, 28. First catalyzed substrate 14 is inserted into first side portion 22 and second catalyzed substrate 16 is inserted into second side portion 28.
Each side portion 22, 28 is swaged or otherwise deformed radially inwardly as indicated by arrows 52 from an initial undeformed position shown in phantom in Fig. 1 to a deformed position shown in solid in Fig. 1 to reduce the diameter of each side portion 22, 28. Such diameter reduction of side portions 22, 28 compresses support mats 26, 30 against substrates 14, 16 to hold substrates 14, 16 in place in side portions 22, 28. The diameter of each of side portions 22, 28 may be reduced in this manner after insertion of heat shield 18 into intermediate portion 32. In other cases, the diameter of one of side portions 22, 28 may be reduced before insertion of heat shield 18 into intermediate portion 32 and the diameter of the other side portion 22, 28 may be reduced after insertion of heat shield 18 into intermediate portion 32. Sensor mount 36 may be secured to intermediate portion 32 and oxygen sensor 20 may be secured to mount 36 before or after reduction of the diameter of side portions 22, 28.
Referring to Figs. 5-7, converter 10 comprises a heat shield 118 in place of heat shield 18. Heat shield 118 is secured to outer tube 24 in a manner different from the way heat shield 18 is secured to outer tube 24. In particular, heat shield 118 is secured to outer tube 24 as a result of reduction of the diameter of side portions 22, 28.
Heat shield 118 comprises an inner tube 140 and a tubular insulation layer 142 positioned between inner tube 140 and intermediate portion 32. Inner tube 140 comprises a main body 144 and opposite first and second end portions 148a,
148b. Side portions 22, 28 engage opposite end portions 148a, 148b and deform them radially inwardly to establish a mechanical lock between first side portion 22 and first end portion 148a and a mechanical lock between second side portion 28 and second end portion 148b as a result of reducing the diameter of side portions 22, 28. As such, inner tube 140 is secured to outer tube 24 without any welds. It is to be understood that, as used herein, terms such as "tube,"
"tubular," "diameter," "cylindrical," and the like implicate a variety of cross-sectional shapes. Such cross-sectional shapes include, for example, a circular cross-sectional shape, an oval cross-sectional shape, a rectangular cross-sectional shape, and other closed curve cross-sectional shapes. While the concepts of the present disclosure have been illustrated and described in detail in the drawings and foregoing description, such an illustration and description is to be considered as exemplary and not restrictive in character, it being understood that only the illustrative embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected.
There are a plurality of advantages of the concepts of the present disclosure arising from the various features of the systems described herein. It will be noted that alternative embodiments of each of the systems of the present disclosure may not include all of the features described yet still benefit from at least some of the advantages of such features. Those of ordinary skill in the art may readily devise their own implementations of a system that incorporate one or more of the features of the present disclosure and fall within the spirit and scope of the invention as defined by the appended claims.

Claims

CLAIMS:
1. A method of assembling a catalytic converter comprising first and second catalyzed substrates, a tubular heat shield, and an outer tube comprising tubular first and second side portions and a tubular intermediate portion located between the first and second side portions, the method comprising the steps of: inserting the heat shield into the intermediate portion, the first catalyzed substrate into the first side portion, and the second catalyzed substrate into the second side portion, after inserting the first catalyzed substrate into the first side portion, reducing a diameter of the first side portion relative to a diameter of the intermediate portion so as to secure the first catalyzed substrate in the first side portion, and, after inserting the heat shield into the intermediate portion and the second catalyzed substrate into the second side portion, reducing a diameter of the second side portion relative to the diameter of the intermediate portion so as to secure the second catalyzed substrate in the second side portion.
2. The method of claim 1, comprising securing an oxygen sensor to the intermediate portion.
3. The method of claim 1, comprising securing the heat shield to the intermediate portion before at least one of the reducing steps.
4. The method of claim 3, wherein the heat shield comprises an inner tube, the inserting step comprises inserting the inner tube into the intermediate portion, and the securing step comprises securing the inner tube to the intermediate portion before at least one of the reducing steps.
5. The method of claim 4, wherein the inner tube comprises a standoff, and the securing step comprises welding the standoff to the intermediate portion before at least one of the reducing steps.
6. The method of claim 1, comprising securing the heat shield to the first and second side portions as a result of the reducing steps.
7. The method of claim 6, wherein the heat shield comprises an inner tube comprising opposite first and second end portions, the inserting step comprises inserting the inner tube into the intermediate portion, and the securing step comprises deforming the first and second end portions inwardly so as to establish a mechanical lock between the first end portion and the first side portion and between the second end portion and the second side portion as a result of the reducing steps.
8. The method of claim 1 , wherein the heat shield comprises an inner tube, and the inserting step comprises inserting the inner tube into the intermediate portion before at least one of the reducing steps.
9. The method of claim 8, wherein the inserting step comprises establishing an air gap between the intermediate portion and the inner tube inserted into the intermediate portion.
10. The method of claim 8, wherein the heat shield comprises a tubular insulation layer surrounding the inner tube, and the inserting step comprises inserting the inner tube and the surrounding tubular insulation layer together into the intermediate portion before at least one of the reducing steps.
11. The method of claim 1 , wherein the step of reducing the diameter of the first side portion comprises reducing the diameter of the first side portion to be less than the diameter of the intermediate portion, and the step of reducing the diameter of the second side portion comprises reducing the diameter of the second side portion to be less than the diameter of the intermediate portion.
12. The method of claim 1, wherein the step of reducing the diameter of the first side portion comprises swaging the first side portion after inserting the heat shield into the intermediate portion and the first catalyzed substrate into the first side portion, and the step of reducing the diameter of the second side portion comprises swaging the second side portion after inserting the heat shield into the intermediate portion and the second catalyzed substrate into the second side portion.
13. A catalytic converter comprising an outer tube formed without any weld and comprising a tubular first side portion, a tubular second side portion, and a tubular intermediate portion positioned between the first and second side portions, each of the first and second side portions having a diameter smaller than a diameter of the intermediate portion, the outer tube having a longitudinal axis, a first catalyzed substrate and a second catalyzed substrate, the first catalyzed substrate being secured in the first side portion, the second catalyzed substrate being secured in the second side portion, and a tubular heat shield positioned in the intermediate portion around the longitudinal axis to inhibit transfer of heat from exhaust gas present in the intermediate portion to the intermediate portion.
14. The catalytic converter of claim 13, comprising an oxygen sensor secured to the intermediate portion.
15. The catalytic converter of claim 13, wherein the heat shield comprises an inner tube positioned in the intermediate portion.
16. The catalytic converter of claim 15, wherein the inner tube includes a standoff welded to the intermediate portion.
17. The catalytic converter of claim 15, wherein the inner tube comprises a main body and opposite first and second end portions extending inwardly from the main body.
18. The catalytic converter of claim 17, wherein the first end portion engages the first side portion to establish a mechanical lock therebetween, and the second end portion engages the second side portion to establish a mechanical lock therebetween.
19. The catalytic converter of claim 13, wherein the heat shield comprises a tubular insulation layer positioned between the inner tube and the intermediate portion.
20. The catalytic converter of claim 13, wherein the inner tube and the intermediate portion cooperate to define an air gap therebetween.
PCT/US2005/025411 2004-08-02 2005-07-19 Catalytic converter and associated method of assembly Ceased WO2006020211A2 (en)

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US10/909,822 US7774936B2 (en) 2004-08-02 2004-08-02 Catalytic converter and associated method of assembly
US10/909,822 2004-08-02

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EP (1) EP1787017B2 (en)
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Also Published As

Publication number Publication date
EP1787017A4 (en) 2010-06-30
EP1787017B2 (en) 2020-07-01
CN101044301A (en) 2007-09-26
EP1787017A2 (en) 2007-05-23
WO2006020211A3 (en) 2007-02-22
EP1787017B1 (en) 2012-05-09
US20060024215A1 (en) 2006-02-02
KR20070053704A (en) 2007-05-25
US7774936B2 (en) 2010-08-17

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