US3814589A - Converter for catalytic exhaust gas cleaning - Google Patents

Converter for catalytic exhaust gas cleaning Download PDF

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Publication number
US3814589A
US3814589A US00262004A US26200472A US3814589A US 3814589 A US3814589 A US 3814589A US 00262004 A US00262004 A US 00262004A US 26200472 A US26200472 A US 26200472A US 3814589 A US3814589 A US 3814589A
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US
United States
Prior art keywords
housing
catalyzator
exhaust gas
input
expansion
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.)
Expired - Lifetime
Application number
US00262004A
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English (en)
Inventor
H Heitland
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Application granted granted Critical
Publication of US3814589A publication Critical patent/US3814589A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor

Definitions

  • a housing having an input for exhaust gas and an output for emitting the cleaned exhaust gas, the housing is made from a material having a high positive coefficient of expansion under heat, a catalyzator body placed in the housing and being secured in it at one end thereof downstream of the gas flow and being made from a material having a low coefiicient of expansion under heat, the catalyzator body and the housing being arranged for relative movement with respect to each other under heat expansion of the housing except for the secured portion of the catalyzator body, a bypass conduit having an input opening to housing at a region upstream of the exhaust gas flow and adapted to connect the input to the housing with the output thereof when the input opening of such pipe conduit is opened, the catalyzator body is mounted in the housing for covering the input opening of the bypass conduit at a predetermined range of temperatures of the exhaust gas and thereby
  • the present invention relates to an exhaust gas cleaning arrangement in general and, more particularly it relates to a converter for catalytically cleaning exhaust gas in motor vehicles by means of a housing containing a catalyzator having a bypass controlled by a valve means which opens such bypass only above a certain temperature value of the exhaust gas.
  • the present invention provides that a covering or opening of the input of the bypass is accomplished solely by the special properties of the housing and of the catalyzator as a function of the temperature in the exhaust gas and without any additional mechanical means.
  • the valve means for the operation of the bypass are formed according to the present invention solely by the housing and the catalyzator.
  • the cross section of the opening of the bypass will gradually increase as being uncovered by the moving catalyzator which provides an appropriate adjustment in the charging of the catalyzator with exhaust gas at each temperature value.
  • German OLS (laid-open application) 1,921,024 discloses also a device for use in the oxidation of the exhaust gas, and which comprises various thermal expansion characteristics of the materials of diiferent parts in order that a bypass could be released or closed.
  • Such components are, however, parts of a very complicated additional valve mechanism while the present invention proposes the various expansion characteristics under temperature only for the housing and the catalyzator which by having such different thermal properties can effect the controlling of the bypass.
  • the exhaust gas passes through the cleaning arrangement in the direction of the arrow from the input conduit 1 through the housing 2 and reaches an output pipe, or tail pipe 3.
  • the housing 2 in the illustrated embodiment is symmetrically formed and comprises an outside shell 4 and a pair of end walls 5 and 6.
  • the shell 4 of the housing 2 has an opening 7 for a bypass conduit 8 which at low temperatures in the exhaust gas is closed since it is covered by the catalyzator 9 and, thereby the bypass conduit 8 is ineffective.
  • the catalyzator body 9 in its back region lying downstream with respect to the flow of the exhaust gas is securely connected with the housing 2 as identified at 10.
  • Such securing is effected not only to provide a simple mechanical securing but also it should be gas tight so that all the gases coming from the input conduit 1 must pass through the catalyzator 9.
  • the catalyzator body 9 is fixedly secured to the housing 10, however, over the rest of its length the catalyzator 9 is only freely surrounded by the housing 2 with a certain clearance so that when the temperature of the exhaust gas changes, due to the different expansion coefiicients of the material of the housing 2 and of the catalyzator 9 under temperature variations, there will be a relative movement taking place in the region of the left hand end of the catalyzator 9 as can be seen in the figure and as can be more clearly seen by the dashed line illustration of the figure.
  • a monolithic catalyzator 9 which has a negative coeflicient of expansion under heat, that is, it undergoes a shrinking with increasing temperatures. Accordingly, the left front wall surface 11 of the catalyzator 9, as seen in the figure, will shift itself at high temperatures into the position identified by 11 while the front wall 5 of the housing 2 due to the positive coefficient of expansion underheat of the steel material of which the housing 2 is made, will move into the position identified by 5. Inasmuch as the front wall 5 of the housing will move physically with it the opening 7 of the bypass 8, the catalyzator body 9 will uncover the opening 7 more or less depending on the excessiveness of the temperature and, now, the bypass 8 becomes operative. In order that the bypass 8 could follow the expansion under the heat effect, it is made at 12 in the form of a bellows so that it could resiliently behave under the expansion of the housing 2.
  • a converter for cleaning the exhaust gas of a combustion engine comprising a housing having an input for said exhaust gas and output for emitting the cleaned exhaust gas, said housing being made from a material having a coetficient of expansion under heat, a catalyzator body placed in said housing and being secured in said housing at one end thereof at a point remote from said input and adjacent said output, said catalyzator body being made from a material having another coefficient of expansion under heat, said catalyzator body and said housing being arranged for relative movement with respect to each other under heat expansion of said housing except for the secured portion of said catalyzator body, a bypass conduit means having an input opening to said housing at a point adjacent said input for said exhaust gas and adapted to connect said input to said housing with the output thereof when said input opening of said pipe conduit is opened, said catalyzator body being mounted in said housing for covering said input opening of said bypass conduit at a predetermined range of temperatures of said exhaust gas and thereby forcing said exhaust gas to pass through said catalyzator body to said output of said
  • bypass conduit comprises a resilient means for allowing expansion or contraction of said bypass conduit upon heat expansion of said housing and thereby to follow the expansion or contraction of said housing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
US00262004A 1971-06-11 1972-06-12 Converter for catalytic exhaust gas cleaning Expired - Lifetime US3814589A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2128990A DE2128990A1 (de) 1971-06-11 1971-06-11 Konverter zur katalytischen abgasreinigung

Publications (1)

Publication Number Publication Date
US3814589A true US3814589A (en) 1974-06-04

Family

ID=5810482

Family Applications (1)

Application Number Title Priority Date Filing Date
US00262004A Expired - Lifetime US3814589A (en) 1971-06-11 1972-06-12 Converter for catalytic exhaust gas cleaning

Country Status (2)

Country Link
US (1) US3814589A (de)
DE (1) DE2128990A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916623A (en) * 1972-09-19 1975-11-04 Audi Ag Device for control of processes that depend on engine temperature in an automotive internal combustion powerplant
US3948611A (en) * 1974-06-10 1976-04-06 Engelhard Minerals & Chemicals Corporation Catalytic converter having hollow, gas-filled mounting means for a monolithic catalyst
US4004887A (en) * 1973-03-16 1977-01-25 Tenneco Inc. Catalytic converter having a resilient thermal-variation compensating monolith-mounting arrangement
US4384843A (en) * 1980-05-13 1983-05-24 United States Of America Combustion method and apparatus with catalytic tubes
US4462812A (en) * 1982-12-08 1984-07-31 General Motors Corporation Ceramic monolith particulate trap including filter support
US5154894A (en) * 1991-08-19 1992-10-13 General Motors Corporation Variable cross section catalytic converter
US5406790A (en) * 1992-12-11 1995-04-18 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
US20040251012A1 (en) * 2003-01-31 2004-12-16 Bush Phillip David Exhaust gas heat exchanger and bypass assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826364A1 (de) * 1988-08-03 1990-02-08 Bayerische Motoren Werke Ag Verzweigte abgasleitung einer brennkraftmaschine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916623A (en) * 1972-09-19 1975-11-04 Audi Ag Device for control of processes that depend on engine temperature in an automotive internal combustion powerplant
US4004887A (en) * 1973-03-16 1977-01-25 Tenneco Inc. Catalytic converter having a resilient thermal-variation compensating monolith-mounting arrangement
US3948611A (en) * 1974-06-10 1976-04-06 Engelhard Minerals & Chemicals Corporation Catalytic converter having hollow, gas-filled mounting means for a monolithic catalyst
US4384843A (en) * 1980-05-13 1983-05-24 United States Of America Combustion method and apparatus with catalytic tubes
US4462812A (en) * 1982-12-08 1984-07-31 General Motors Corporation Ceramic monolith particulate trap including filter support
US5154894A (en) * 1991-08-19 1992-10-13 General Motors Corporation Variable cross section catalytic converter
US5406790A (en) * 1992-12-11 1995-04-18 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
US20040251012A1 (en) * 2003-01-31 2004-12-16 Bush Phillip David Exhaust gas heat exchanger and bypass assembly
US7264040B2 (en) * 2003-01-31 2007-09-04 Et Us Holdings Llc Exhaust gas heat exchanger and bypass assembly

Also Published As

Publication number Publication date
DE2128990A1 (de) 1973-01-04

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