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
  • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
  • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
  • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B17/00—Insulators or insulating bodies characterised by their form
  • H01B17/26—Lead-in insulators; Lead-through insulators
  • H01B17/30—Sealing
• • 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
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention relates to the electrically insulating gas-tight leadthrough of at least two electrical conductors through a metallic jacket of an exhaust system of an internal combustion engine, in particular an electrically heatable catalytic converter.
• WO 94/18442 proposes the electrically insulating To design a gas-tight bushing in such a way that it is divided into two sections one behind the other, of which the first section closer to the exhaust system is designed for electrical insulation and temperature-resistant, but need not be completely gas-tight, while the second section further away from the exhaust system is designed as a gas-tight and electrically insulating bushing for lower temperatures.
• two electrical conductors are guided through the jacket side by side.
• the present invention is based on the object of developing the known electrically insulating gas-tight bushing in such a way that it can be produced more economically. Furthermore, the implementation of the implementation should provide a simple possibility of connecting electrical lines.
• an electrically insulating gas-tight bushing for at least two electrical conductors through a metallic jacket of an exhaust system of an internal combustion engine, in particular an electrically heatable catalytic converter, the jacket in the area of the bushing having a sleeve through which the conductors extend, proposed, the conductors being guided coaxially in the sleeve.
• This configuration of the implementation requires only a single connection to the electrically heatable catalytic converter for the power supply.
• a coaxial line can be used as the connecting cable, whereby a reduction in electromagnetic pulses is achieved. The space requirement is also reduced.
• Another advantage of the coaxial implementation is that it uses the known methods the stud welding can be attached to corresponding connections or structures of the catalytic converter.
• An embodiment is preferred in which the compressed powder mixture of magnesium oxide and aluminum oxide (Al 2 O 3 ) is present as the insulating material.
• the gas tightness is achieved in that the bushing is sealed gas-tight at least on one of its end faces.
• the sealing material for the gastight formation of the bushing.
• Enamel can also be used as a sealing material.
• the sealing material glass or enamel can also advantageously be used for the gas-tight implementation of the implementation of at least two electrical conductors through a metallic jacket of an exhaust system of an internal combustion engine, in particular an electrically heatable catalytic converter, the jacket in the area of the implementation having a sleeve through which the Extend conductor and are not coaxial, but are arranged side by side, are used.
• the sealing material has such a high melting point that it can be sealed in close proximity to the converter.
• plasma-sprayed aluminum oxide is proposed for gas-tight implementation and electrical insulation. As a result, both the electrical insulation and the gas tightness are achieved in one production step. The same advantages as plasma-sprayed aluminum oxide are achieved with ceramic casting compounds.
• Figure 1 shows schematically the cross section through a bushing on an electrically heatable honeycomb body
• FIG. 2 shows a top view of the bushing according to FIG. 1.
• FIG 1 shows only schematically indicated the internal structure of an electrically heatable honeycomb body 1 in an exhaust system.
• Electrically conductive structures 2, 3 for introducing the electric current are located in the honeycomb body 1.
• the electrically conductive structures can be at least partially structured metal sheets.
• the structure of such a honeycomb body is described, for example, in WO 92/02714.
• the exhaust system is enclosed by a jacket 4.
• the jacket 4 can be a one-piece tubular housing.
• the jacket 4 can also consist of two shells.
• a through opening 5 is formed in the jacket 4, into which a sleeve 6 projects.
• the sleeve 6 can be materially connected to the jacket 4, in particular welded, or soldered. As can be seen from the illustration, the sleeve 6 projects partially into the honeycomb body 1.
• the sleeve 6 can also be flush with the inner surface of the jacket 4.
• the conductors 7, 8 are electrically insulated from one another.
• the electrical insulation is formed by an insulation layer 9.
• the insulation layer 9 can be plasma-sprayed aluminum oxide (Al 2 O 3 ) act.
• the outer tubular conductor 8 is electrically insulated from the sleeve 6 by an insulation layer 10.
• the end of the centrally arranged conductor 7 protruding into the honeycomb body 1 is connected to the structure 2.
• the end region of the conductor 8 arranged coaxially to the centrally arranged conductor 7 is connected to a structure 3.
• the conductors 7, 8 can be connected to the structures 2, 3 by welding or brazing.
• a corresponding connection adapter which is not shown, has corresponding conically shaped receptacles for the conical ends of the conductors 7, 8, as a result of which a reliable electrical contact can be created between the conductors 7 and 8 with a corresponding coaxial connection cable.
• an external thread 11 is provided on the sleeve 6, onto which a union nut can be screwed.

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)
• Exhaust Gas Treatment By Means Of Catalyst (AREA)
• Catalysts (AREA)
• Insulating Bodies (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7763819

Family Applications (1)

Country Status (13)

Cited By (1)

Families Citing this family (17)

Citations (2)

Family Cites Families (10)

• 1995
  • 1995-06-07 DE DE19520758A patent/DE19520758A1/de not_active Withdrawn
• 1996
  • 1996-04-25 DE DE59601427T patent/DE59601427D1/de not_active Expired - Fee Related
  • 1996-04-25 ES ES96913527T patent/ES2129964T3/es not_active Expired - Lifetime
  • 1996-04-25 RU RU98100476/09A patent/RU2196368C2/ru active
  • 1996-04-25 WO PCT/EP1996/001735 patent/WO1996041353A1/de active IP Right Grant
  • 1996-04-25 KR KR1019970708688A patent/KR19990022209A/ko not_active Abandoned
  • 1996-04-25 AU AU56480/96A patent/AU5648096A/en not_active Abandoned
  • 1996-04-25 JP JP9500110A patent/JPH11507114A/ja active Pending
  • 1996-04-25 CN CN96194648A patent/CN1086501C/zh not_active Expired - Fee Related
  • 1996-04-25 EP EP96913527A patent/EP0830695B1/de not_active Expired - Lifetime
  • 1996-05-06 IN IN830CA1996 patent/IN188209B/en unknown
  • 1996-05-23 TW TW085106112A patent/TW300940B/zh active
  • 1996-06-06 MY MYPI96002239A patent/MY132195A/en unknown
• 1997
  • 1997-12-08 US US08/986,368 patent/US5887427A/en not_active Expired - Fee Related

Patent Citations (2)

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