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
  • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
  • F01N3/2807—Metal other than sintered metal
  • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
• • 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
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B3/00—Ohmic-resistance heating
  • H05B3/02—Details
  • H05B3/06—Heater elements structurally combined with coupling elements or holders
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
  • H05B2203/022—Heaters specially adapted for heating gaseous material
  • H05B2203/024—Heaters using beehive flow through structures
• • 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
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• • 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 a metallic honeycomb body through which a fluid can flow, with a metallic housing and with an electrically conductive structure which is electrically insulated from the honeycomb body at least in some areas and which is in good thermal contact with the honeycomb body or directly with the fluid, the structure can be connected via at least one connection to a power supply line arranged outside the housing and the connection is guided through the housing in an electrically insulated manner.
• Honeycomb bodies with such structures are used in particular as electrically heatable catalyst carrier bodies in catalytic converters for cleaning motor vehicle exhaust gases. Such structures are also used as temperature sensors.
• heating structures are described in WO 92/02714, the honeycomb bodies in this document practically consisting only of heating structures.
• Such arrangements are described, for example, in the unpublished German patent application P 41 29 893.4 or the likewise unpublished German patent application P 42 23 134.5.
• Sheathed conductors are mentioned in these documents as particularly suitable measuring or heating structures, that is to say electrical conductors which are arranged in a metallic sheath and separated from it by a ceramic, usually powder-like insulation. Such sheathed conductors can in particular be rolled between two thin sheets.
• the object of the present invention is to avoid the above-described disadvantages of the prior art and to create a honeycomb body with a measuring or heating structure which does not heat up excessively in the area of the connection and therefore z. B. can be connected with copper cables in a reliable manner or which in the area of the connection does not cause any resistance changes which strongly influence the measurement as a function of the temperature in the case of temperature sensors.
• a fluid-flowable metallic honeycomb body with a metallic housing in particular an electrically heatable catalyst carrier body for cleaning motor vehicle exhaust gases, is used, with an electrically conductive structure that is electrically insulated from the honeycomb body at least in some areas and that is in good thermal contact with the Honeycomb body or directly with the fluid, the structure being connectable via at least one connection to a power supply line arranged outside the housing and the connection being guided through the housing in an electrically insulated manner, the connection and the structure also having a lower resistance in the region of the connection than the structure in the interior of the honeycomb body.
• the inventive idea can be realized in that the conductor and the sheath have a larger cross section in the area of the connection than in the interior of the honeycomb body. The enlargement of the cross-section must go so far that overheating to critical temperatures cannot take place in the area of the connection or the resistance is reduced to an insignificant size for a measurement.
• the inside of the measuring or heating conductor generally has a diameter of 10 to 35% of the outer diameter of the sheath, with inner conductors of 15 to 25% of the diameter of the sheath advantageously being used for the present applications.
• Such sheathed conductors can be reduced from an originally large diameter to a much smaller diameter by pulling, hammering or rolling, the length increasing accordingly.
• Sheathed conductors which have an original sheath diameter of 4 to 4 at the ends are particularly suitable for the present invention 8 mm, but in the area in between are reduced to a diameter of 0.5 to 2 mm.
• Particularly favorable values are a diameter of approximately 5 mm in the area of the connections and a diameter of approximately 1 mm in the interior of the honeycomb body.
• the metallic jacket can be welded to the housing in a sealing manner, which is important for many arrangements, in particular in the case of catalytic converters for motor vehicles.
• a honeycomb body with an integrated measuring or heating conductor is first wound spirally, layered or otherwise entwined in a manner known per se and then inserted into a housing.
• the housing has a slot from the front to the area of the connection through which the measuring or heating conductor with the jacket can be pushed into the desired position.
• the housing can then be tightly sealed by subsequently welding the slot and the casing to the housing.
• the production of a honeycomb body with an integrated measuring or heating conductor differs in many cases from the known production of metallic honeycomb bodies without a measuring or heating conductor.
• FIG. 1 shows a schematic longitudinal section through a sheathed conductor with thickened ends
• FIG. 2 shows a sheathed conductor rolled in between two sheets in cross section
• FIG. 3 schematically shows the U-shaped course of a measuring or heating conductor within a bending position of a honeycomb body
• 4 shows a cuboid honeycomb body made of alternately stacked smooth and corrugated sheets with an integrated measuring or heating conductor
• Fig. 5 shows a typical catalyst carrier body with an integrated measuring or heating conductor, such as by gobbling in opposite directions
• Stack of sheets according to FIG. 4 can be produced.
• the inner conductor 1 shows a sheathed conductor with an inner conductor 1 and a metallic sheath 2, which are insulated from one another by an insulating layer 3.
• the inner conductor 1 has thickened ends 4, in which the electrical resistance is considerably lower than in the thin area.
• the jacket is also thickened in the end regions 5 and has an external thread 6 at the very end.
• the thickened inner conductor 4 has a piece 7 which protrudes beyond the thickened jacket 5 and its end 6 provided with an external thread. This protruding piece 7 can be inserted directly into a socket 8 as a plug, and the plug connection can be secured by means of the union nut 9 and the external thread 6.
• the outer diameter D in the area of the connections is, for example, 5 mm, while the outer diameter d of the jacket in the interior of the honeycomb body can be, for example, approximately 1 mm.
• the diameter of the inner conductor 1 or 4 is 15 to 25%, preferably about 20%, of the outer diameter of the jacket.
• Fig. 2 shows schematically how a sheathed conductor can be arranged between two sheets 11, 12.
• the inner conductor 1 with the electrical insulation 3 surrounding it and the outer sheath 2 lies in a bulge 13 of the metal sheets 11, 12, this shape being able to be produced, for example, by rolling in with elastic rollers.
• the sheets 11, 12 can be soldered to one another on the side regions 14 to increase the stability of the structure.
• Such an arrangement can also be corrugated by corrugated rollers, so that a measuring or heating conductor can be integrated not only in smooth sheet metal layers but also in corrugated sheet metal layers.
• Fig. 3 shows schematically that a sheathed conductor 2 can also run in a U-shape in or on a sheet metal layer 11, which is advantageous if the connections are to be close to each other.
• a cuboid honeycomb body 20 is shown schematically, which consists of alternating layers of smooth 21 and corrugated 22 sheets.
• a sheathed conductor is integrated in its interior between two smooth sheet metal layers 11, 12, the thickened end 25 of which protrudes laterally.
• the sheathed conductor 25 in turn extends in bulges 13 of the sheet metal layers 11, 12.
• the sheathed conductor 25 has two inner conductors 27, 28, which are preferably connected to one another at their other ends, so that a U-shaped loop results overall.
• FIG. 5 shows a typical honeycomb body for catalytic converters of motor vehicles, as can be produced in a manner known per se from a stack of sheets shown in FIG. 4 by intertwining the ends around two fixed points 33, 34.
• This honeycomb body 30 has a housing 35 which has a slot 31 starting from an end face. Between two sheet metal layers 11, 12 of the honeycomb body 13, a sheathed conductor is again integrated, the thickened end 5 of which is guided through the housing 35 to the outside with an external thread 6 and a projecting piece 7 of the inner conductor.
• Such a body is produced by first swallowing a body according to FIG. 4 in opposite directions and then pushing it into the housing 35 from one end face becomes. The connector 5, 6, 7 is pushed through the slot 31 into the desired position. Subsequently, the slot 31 can be welded, as indicated in the drawing, a tight connection 32 being produced between the casing 5 and the housing 35 at the same time.
• the present invention is particularly suitable for the electrical heating of and / or the temperature measurement in catalytic converters for motor vehicles.
• the invention is particularly advantageous to use in cases in which a voltage higher than 12 volts is to be used for heating. When heating with 12 volts, high currents are required, which in turn require thick supply lines and relatively complex switching devices. This effort can be partially avoided by heating with a higher voltage if a corresponding voltage converter is available.

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• 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)
• Catalysts (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6478944

Family Applications (1)

Country Status (3)

Cited By (2)

Families Citing this family (3)

Citations (8)

Family Cites Families (2)

• 1993
  • 1993-01-26 DE DE4302068A patent/DE4302068A1/de not_active Withdrawn
  • 1993-12-05 TW TW082110643A patent/TW247279B/zh active
• 1994
  • 1994-01-10 WO PCT/EP1994/000046 patent/WO1994017289A1/de not_active Ceased

Patent Citations (8)

Non-Patent Citations (1)

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