EP4619625A1 - Stützstruktur für eine heizmatrix - Google Patents
Stützstruktur für eine heizmatrixInfo
- Publication number
- EP4619625A1 EP4619625A1 EP23809509.5A EP23809509A EP4619625A1 EP 4619625 A1 EP4619625 A1 EP 4619625A1 EP 23809509 A EP23809509 A EP 23809509A EP 4619625 A1 EP4619625 A1 EP 4619625A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support structure
- heating matrix
- coupling
- coupling element
- elements
- 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.)
- Pending
Links
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
-
- 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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
Definitions
- the invention relates to a support structure for positioning a heating matrix in an exhaust gas path spatially delimited by a housing, wherein the heating matrix is formed by a honeycomb body which has a plurality of flow channels through which flow can take place along a main flow direction, wherein the heating matrix is supported by the support structure relative to the inner surface of the housing and the matrix is fixed relative to the support structure by means of a plurality of coupling elements, wherein the coupling elements are inserted into individual cells of the heating matrix formed by the flow channels and are permanently connected to them.
- the invention also relates to a method for connecting a support structure to a heating matrix.
- Electric heating elements are now regularly used to heat exhaust gases in an exhaust system downstream of a combustion engine or the exhaust gases flowing in an exhaust system.
- the aim here is to reach a temperature threshold more quickly, at which an effective conversion of the pollutants carried in the exhaust gas can take place. This is necessary because the catalytically active surfaces of the catalysts installed in the exhaust system used for exhaust gas aftertreatment only allow sufficient conversion of the respective pollutants at a minimum temperature, the so-called light-off temperature.
- heating catalysts which have a metallic structure connected to a voltage source or a metallically coated ceramic structure which can be heated by utilizing the ohmic resistance.
- the heatable metallic structures can, for example, consist of a honeycomb body made from metal foils.
- a plurality of smooth and/or at least partially structured metal foils are stacked on top of one another and wound around at least one pivot point to form a honeycomb body.
- the matrix formed from the metal foils can be electrically contacted and heated using the ohmic resistance.
- the matrix must be arranged in an exhaust gas line and be located upstream or downstream of a catalyst designed for exhaust gas aftertreatment in the flow direction of the exhaust gas.
- a support In order to position the matrix in the exhaust system and to support it in particular against mechanical and thermal loads, a support must be provided which can withstand in particular the high thermal cycling loads and also the strong and irregular mechanical loads which occur in an exhaust system, in particular the exhaust system of a motor vehicle.
- connection between the support structure and the heating matrix is achieved via a number of coupling elements. Since all components are subject to certain manufacturing tolerances due to production, tolerance compensation must be created in order to enable stress-free assembly. A particular disadvantage of the known solutions in the prior art is that the tolerance compensation of the known coupling elements is not sufficient.
- the object of the present invention is to provide a support structure for a heating matrix which has advantageous coupling elements that allow sufficient tolerance compensation. Furthermore, the object of the invention is to provide a method for connecting the support structure to the heating matrix. The object with regard to the support structure is achieved by a support structure having the features of claim 1.
- One embodiment of the invention relates to a support structure for positioning a heating matrix in an exhaust gas path spatially delimited by a housing, wherein the heating matrix is formed by a honeycomb body which has a plurality of flow channels through which flow can take place along a main flow direction, wherein the heating matrix is supported by the support structure relative to the inner surface of the housing and the matrix is fixed relative to the support structure by means of a plurality of coupling elements, wherein the coupling elements are inserted into individual cells of the heating matrix formed by the flow channels and are permanently connected to them, wherein the respective free end of a coupling element is directly or indirectly connected to the support structure, wherein a tolerance compensation element is provided in each case which compensates for a positional tolerance of the coupling element in at least two spatial directions.
- Tolerance compensation is necessary because all components are subject to tolerances due to production. Compensation is therefore essential for precise assembly. In addition to the production-related tolerances, a tolerance arises because the coupling elements have to be inserted into cells of the honeycomb body. Slight deviations can sometimes occur here; in addition, a coupling element can deviate slightly from its basic position due to a shape tolerance of the honeycomb body.
- tolerance compensation is provided in the area of the connection of the coupling element to the support structure, since the connection to the honeycomb body offers practically no compensation options.
- the coupling element which can be formed, for example, by a support pin known in the prior art, or, depending on the need for electrical insulation, can also be formed by a simple metal pin, can be connected directly to the support structure or using an intermediate element.
- the third spatial direction runs as a surface normal to this plane.
- a positional tolerance of the coupling element is essentially compensated if, for example, the coupling element is inserted into a neighboring cell of the actual target cell or the honeycomb body has a manufacturing tolerance in this area.
- the third spatial direction which is the direction in which the coupling elements are inserted into the honeycomb body, a tolerance in the axial direction of the exhaust line is compensated.
- the tolerance in the third direction is usually smaller than in the first two directions, since the insertion depth in the honeycomb body is controlled very precisely by machine and the deviations are therefore small.
- the support structure has, on its surface facing the heating matrix, cup-like chambers which are open to the heating structure and which are each designed to receive a free end of a coupling element and form the tolerance compensation elements.
- the support structure which is essentially made of flat metal sheets, can have cup-like chambers. These can be formed directly on the surface of the support structure facing the heating matrix.
- the chambers can be formed directly into the sheet material, for example by deep drawing or embossing. Alternatively, the chambers can also be formed by a cylindrical collar which protrudes from the support structure.
- the clear opening width of the cup-like chambers is a multiple of the cross-section of a free end of a coupling element.
- the free end of the coupling element can then be moved within the clear opening in the first two spatial directions.
- tolerance compensation must take place.
- the size of the clear opening simultaneously determines the maximum possible tolerance compensation in the first two spatial directions, while the depth of the chambers essentially determines the maximum possible tolerance compensation in the third spatial direction.
- the connecting element has an opening facing the coupling element which is larger than the cross-section of the free end of the coupling element. If tolerance compensation essentially has to take place in one of the first two spatial directions, an elongated hole-like opening can be provided. Alternatively, a circular or rectangular opening cross-section can be selected. The object with regard to the method is achieved by a method having the features of claim 8.
- One embodiment of the invention relates to a method for connecting the support structure to the heating matrix, wherein the connecting elements are first permanently connected to the coupling elements and, in a subsequent step, are permanently connected to the surface of the support structure facing the heating matrix.
- the connecting element can first be connected to the free end of the coupling element. Any positional tolerance of the coupling element is transferred to the connecting element here. This applies in particular to tolerances in the first two spatial directions. Tolerances in the third spatial direction can already be compensated by correcting the insertion depth of the coupling element in the connecting element.
- the coupling elements are permanently connected to the connecting elements using a suitable process. This is followed by the connection to the support structure. Since the position tolerances have been transferred to the connecting elements, it can happen that the connecting elements deviate from the originally planned position of the connecting elements by precisely these tolerances. This can be counteracted by making the support structure wider in the area of the planned position of the respective connecting elements.
- the connecting elements preferably have a smooth surface facing the support structure, via which a connection to the support structure can be made in a simple manner.
- the opening width for inserting the coupling elements only needs to be slightly larger than the free ends of the coupling elements, since the tolerance compensation here only takes place in the third spatial direction and the compensation of the The first two spatial directions are then changed by changing the position of the connecting element relative to the support structure.
- the connecting elements are permanently connected to the surface of the support structure facing the heating matrix in a first step, and in a subsequent step the coupling elements are inserted into the connecting elements and permanently connected to them.
- the connecting elements are first connected to the support structure.
- the clear opening of the connecting elements must be large enough to allow tolerance compensation in the first two spatial directions.
- the third spatial direction is compensated by adjusting the insertion depth.
- Fig. 1 is a partial view of a support structure with a plurality of connecting elements which are attached to the support structure and have different positions relative to the support structure,
- Fig. 2 is a partial view of a support structure with a plurality of connecting elements arranged at predefined positions on the support structure
- Fig. 3 is a sectional view through two connecting elements, each with an inserted coupling element, the coupling element being fixed by a clamp in the connecting element, and
- Fig. 4 a coupling element which is accommodated in cup-shaped chambers on both sides.
- Figure 1 shows a support structure 1 which has several connecting elements 3 on one of its struts 2.
- a coupling element 4 can be inserted into each of the connecting elements 3.
- the support structure 1, the connecting elements 3 and the coupling elements 4 can be permanently connected to one another by means of a soldering process.
- the connecting elements 3 are first connected to the coupling elements 4, which in turn are inserted into cells of a heating matrix and connected to it.
- the positional tolerances that result from the production-related tolerances of the heating matrix are transferred to the connecting elements 3 via the coupling elements 4. Therefore, the connecting elements 3, shown here on the middle connecting element 3, are not arranged in the middle of the strut 2, but sometimes slightly offset from its center.
- Figure 2 shows connecting elements 5 on a strut 2 of a support structure 1.
- the connecting elements 5 have a slot-like opening, which enables tolerance compensation in one of the first two spatial directions.
- the connecting elements 5 are first connected to the strut 2 of the support structure 1 before the coupling elements 4 are inserted into them. Therefore, the connecting elements 5 are also arranged very evenly distributed over the strut 2.
- Figure 3 shows a sectional view through a coupling element 4, which is inserted into a connecting element 6 on one side.
- the coupling element 4 is connected by means of a clamping with the connecting element 6. This can be a first fixation before a permanent connection is created by soldering.
- Figure 4 shows a coupling element 4 which is inserted into hollow cylindrical receptacles 7 on both sides.
- the position tolerance in the third spatial direction can be compensated by varying the insertion depth.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022212258.5A DE102022212258B3 (de) | 2022-11-17 | 2022-11-17 | Stützstruktur für eine Heizmatrix |
| PCT/EP2023/082082 WO2024105177A1 (de) | 2022-11-17 | 2023-11-16 | Stützstruktur für eine heizmatrix |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4619625A1 true EP4619625A1 (de) | 2025-09-24 |
Family
ID=88874845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23809509.5A Pending EP4619625A1 (de) | 2022-11-17 | 2023-11-16 | Stützstruktur für eine heizmatrix |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4619625A1 (de) |
| CN (1) | CN120303469A (de) |
| DE (1) | DE102022212258B3 (de) |
| WO (1) | WO2024105177A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007025417A1 (de) * | 2007-05-31 | 2008-12-04 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Elektrisch beheizbare Wabenkörper-Anordnung mit Stützstiften |
| DE102011120720A1 (de) | 2011-12-12 | 2013-06-13 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Stützstift für einen elektrisch beheizbaren Wabenkörper |
| DE102019121382A1 (de) * | 2019-08-07 | 2021-02-11 | Faurecia Emissions Control Technologies, Germany Gmbh | Abgasbehandlungseinrichtung und Fahrzeug |
| DE102019218885B4 (de) * | 2019-12-04 | 2021-06-17 | Vitesco Technologies GmbH | Stützstift für Katalysator mit elektrischer Heizscheibe |
| EP4047195A1 (de) * | 2021-02-11 | 2022-08-24 | Benteler Automobiltechnik GmbH | Halter für ein elektrisches heizelement in einer abgasnachbehandlungsvorrichtung |
-
2022
- 2022-11-17 DE DE102022212258.5A patent/DE102022212258B3/de active Active
-
2023
- 2023-11-16 WO PCT/EP2023/082082 patent/WO2024105177A1/de not_active Ceased
- 2023-11-16 EP EP23809509.5A patent/EP4619625A1/de active Pending
- 2023-11-16 CN CN202380079855.5A patent/CN120303469A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN120303469A (zh) | 2025-07-11 |
| DE102022212258B3 (de) | 2024-01-25 |
| WO2024105177A1 (de) | 2024-05-23 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
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| AK | Designated contracting states |
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