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
  • F01N3/2006—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
• • 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
  • F01N3/2006—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
• • 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
  • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
  • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
• • 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
  • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
• • 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
  • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
• • 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
  • F01N2510/00—Surface coverings
  • F01N2510/02—Surface coverings for thermal insulation
• • 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 invention relates to a power feedthrough for an electrically heatable catalyst, the catalyst having at least one electrical conductor in its interior, which can be electrically contacted by means of the power feedthrough, with a central electrically conductive element which is guided from the inside of the catalyst through its outer housing wall , with an electrical insulation layer which surrounds the electrically conductive element on its radial outer surface, and with a metallic sleeve in which the electrically conductive element and the electrical insulation layer is received.
• Electrically heatable catalysts are known in the prior art. These usually have a current-carrying conductor which is connected to a voltage source via electrical contact. Since the catalytic converters are designed to be gas-tight to the outside, there are special electrical feedthroughs that are passed through the outer jacket of the catalytic converter and are in contact with the heating conductor inside.
• the electrical leadthrough consists of an electrical conductor that is embedded in an electrically non-conductive medium, for example a ceramic.
• the non-conductive material can in turn be surrounded by a metal sleeve, which can be connected to the metallic jacket of the catalytic converter permanently and resistant to mechanical loads by means of a joining technique.
• the electrical feedthrough thus regularly has a central current conductor, for example a bolt, ceramic insulation and a metallic outer sleeve.
• a disadvantage of the current feedthroughs known in the prior art is, in particular, that due to the material connection between the current-carrying bolt and the components to be electrically contacted inside the catalytic converter, a high thermal load occurs on the outer area of the current feedthrough.
• the thermal load arises either through convection of the exhaust gas energy on the electrical feedthrough or through the heating of the heating conductor itself, which is in direct material connection with the electrical feedthrough. If the thermal loads are too high, the insulation of the electrical feed line or the connecting means between the feed line and the power feed-through can be damaged, in particular at the contact area of the power leadthrough in the outer area.
• One embodiment of the invention relates to a power feedthrough for an electrically heatable catalytic converter, the catalyzer having at least one electrical conductor in its interior, which can be electrically contacted by means of the power feedthrough, with a central electrically conductive element which comes from the inside of the catalytic converter through its outer housing wall is performed, with an electrical insulation layer which surrounds the electrically conductive element on its radial outer surface, and with a metallic sleeve in which the electrically conductive element and the electrical insulation layer is received, with a device on the current leadthrough or directly adjacent to the current leadthrough Reduction of heat conduction device is arranged from the interior of the catalyst along the current feedthrough to a contact surface arranged outside the catalyst.
• the area of the current feedthrough that protrudes into the catalytic converter is also generally referred to as the hot end, since on the one hand the exhaust gas flowing through the catalytic converter can contribute to a high temperature level, and on the other hand a high temperature level due to the energization of the electrical conductor itself inside the catalytic converter Temperature level can be generated.
• the end of the current feedthrough arranged outside the catalytic converter is also referred to as the cold end, since the temperatures here as a rule are significantly lower than within the catalytic converter.
• the cold end area, at which the connection to a voltage source is created is temperature-sensitive. This is due on the one hand to the materials of the current conductors usually used, for example the insulation material of cables, and also in the connection method chosen, for example soldering, crimping or spring clips, between the current conductor and the contact surface of the current feedthrough.
• a device for reducing the heat conduction from the hot end to the outside cold end serves here in particular to keep the heat energy inside the catalytic converter or at least to keep the amount of heat transported to the outside along the current feedthrough as low as possible.
• the electrically conductive element is formed by a bolt.
• the bolt can preferably have a round cross section.
• the insulation layer and the metal sleeve can be arranged concentrically to the bolt.
• the device is formed by at least a section of reduced thermal conductivity on the electrically conductive element.
• the thermal conductivity is reduced at least in one section advantageous in order to prevent as large a part as possible of the amount of heat introduced into the current feedthrough at the hot end from being transported to the cold end.
• a thermally insulating material can be selected, for example, which in particular has a lower thermal conductivity than the electrically conductive element.
• the device is formed by a heat shield.
• a heat shield is used in particular to shield against thermal convection.
• a preferred embodiment is characterized in that the heat shield is arranged on the outside of the housing wall to shield the contact surface.
• Such a heat shield is intended, in particular, to prevent heat radiation from the current feedthrough itself but also from the housing of the catalytic converter in the direction of the cold end.
• the heat shield can, for example, be arranged around the power feed-through in the manner of a rosette.
• the heat shield is arranged on the inside of the housing wall.
• a heat shield on the inside of the housing wall is used in particular to reduce the heat transfer from the flowing exhaust gas to the power feed-through and the housing areas surrounding it.
• a heat shield arranged inside the catalytic converter can also be arranged around the power feed-through in the manner of a rosette.
• the device is formed by an additional thermal mass which is thermally connected to the current feedthrough.
• An additional thermal mass is formed by a body with a larger mass and serves to absorb and temporarily store the thermal energy.
• the device is formed by a single or a plurality of cooling ribs which is / are thermally connected to the current feedthrough. Cooling fins serve in particular to transport heat away from the electrical feedthrough to the environment. The cooling fins are preferably on the arranged outside the housing of the catalytic converter section of the power feedthrough.
• the device is formed by an electrically conductive element which, at least in sections, has a greatly reduced diameter.
• a material can preferably be selected in sections which, for example, has a lower specific resistance. Due to the smaller diameter, the heat conduction is reduced, whereby the electrical conductivity is not impaired overall due to the adjustment of the specific resistance.
• the device is formed by an elongated electrically conductive element.
• the electrically conductive element by lengthening the electrically conductive element beyond the amount that is absolutely necessary, it is advantageous because the distance on which the heat from the current feedthrough can be given back to the environment is increased. This means that the temperature level at the cold end can also be reduced.
• the extension particularly refers to a longer version than would be provided as standard.
• the device is formed by a segment of the current feedthrough in which a phase change of a substance is carried out in order to convert thermal energy.
• a segment in which a phase change of a substance, for example the evaporation of water, is carried out is advantageous because this also removes thermal energy and thus lowers the temperature level in the area of the current feedthrough.
• FIG. 1 shows a view of a current feedthrough with a heat shield
• FIG 3 shows a view of a current feedthrough with a segment of reduced thermal conductivity.
• FIG. 1 shows a current feedthrough 1. This is formed from an electrically conductive bolt 2, which is surrounded at least in sections by an electrically non-conductive insulation layer 3. In the area of the insulation layer 3, a metallic sleeve 4 is also arranged, in which the electrically conductive bolt 2 and the insulation layer 3 are received.
• the right end 5 of the bolt 2 forms the so-called hot end, which protrudes into the catalytic converter (not shown) and is in electrically conductive contact with the electrical conductor in the catalytic converter.
• the left end 6 forms the so-called cold end, which forms the contact area outside the catalytic converter.
• the heat shield 7 can be seen, which is arranged on the side of the metal sleeve 4 and the insulation layer 3 facing the cold end 6.
• the heat shield 7 serves to reduce heat radiation from the catalytic converter (not shown) and from the direction of the hot end 5 of the electrical feedthrough 1.
• the heat shield 7 can for example be formed by a sheet metal. Alternatively or in addition, it can also have a thermally insulating material.
• FIG. 2 shows an alternative embodiment of the power feedthrough 8, the power feedthrough 8 having an area of reduced diameter 9.
• a material with a lower specific electrical resistance is used, for example, so that the same electrical conductivity is achieved despite the changed diameter.
• the area of smaller diameter 9 is also arranged on the side of the electrical feedthrough 8 facing the cold end 6.
• Another possibility here would be to cut out the material of the current feedthrough 1 at a point 9 and to occupy the groove created with an alternative material which has a lower thermal conductivity and an equivalent electrical conductivity.
• FIG. 3 shows a further alternative embodiment of a current feedthrough 10, a segment 11 of reduced thermal conductivity being formed in this exemplary embodiment.
• a material that differs from the rest of the bolt can be used to produce this segment.
• the different features of the individual exemplary embodiments can also be combined with one another.
• the exemplary embodiments of FIGS. 1 to 3 in particular are not of a restrictive nature and serve to illustrate the concept of the invention.

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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=71266640

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (15)

• 2019
  • 2019-07-12 DE DE102019210368.5A patent/DE102019210368B4/de active Active
• 2020
  • 2020-06-24 JP JP2022501353A patent/JP2022539906A/ja active Pending
  • 2020-06-24 WO PCT/EP2020/067597 patent/WO2021008832A1/de unknown
  • 2020-06-24 EP EP20735118.0A patent/EP3997313A1/de not_active Withdrawn
  • 2020-06-24 CN CN202080049435.9A patent/CN114072569A/zh active Pending
  • 2020-06-24 KR KR1020227004776A patent/KR20220050888A/ko active IP Right Grant
• 2022
  • 2022-01-12 US US17/573,817 patent/US20220136422A1/en active Pending

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