GB2047557A - Catalyst assembly for exhaust systems - Google Patents
Catalyst assembly for exhaust systems Download PDFInfo
- Publication number
- GB2047557A GB2047557A GB8010201A GB8010201A GB2047557A GB 2047557 A GB2047557 A GB 2047557A GB 8010201 A GB8010201 A GB 8010201A GB 8010201 A GB8010201 A GB 8010201A GB 2047557 A GB2047557 A GB 2047557A
- Authority
- GB
- United Kingdom
- Prior art keywords
- catalyst
- sections
- container
- catalytic element
- catalyst container
- 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.)
- Withdrawn
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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
-
- 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
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
-
- 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
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/06—Tubes being formed by assembly of stamped or otherwise deformed sheet-metal
Abstract
A catalyst assembly comprises a resilient catalystic element surrounded by a catalyst container formed from a pair of sections, the adjacent edges of each of the sections abutting each other in overlapping relationship so as to present a substantially smooth inner surface and being secured together by suitable means. One edge of each pair of abutting edges of the container sections is joggled outwardly, so that the other edge may slide inside the joggled edge and the two sections may be closed together about the catalytic element, until the catalytic element is subjected to a predetermined load. The assembly is for use in exhaust systems of I.C. engines. <IMAGE>
Description
SPECIFICATION
Improvements in and relating to the construction of catalyst assemblies
This invention relates tp catalyst assemblies, suitable for use in the exhaust systems of internal combustion engines, primarily those of road vehicles, for breaking down unburnt products in the exhaust gases and thereby reducing the pollution emitted, and in particular to the construction thereof.
Catalyst assemblies according to the present invention, utilise catalysts which are deposited in the interstices of either ceramic or metal, honeycomb structures. Metal honeycombs of this sort may be made from alternate layers of corrugated and flat sheet metal which may, for example, be formed from a composite sheet comprising one corrugated layer and one flat layer which is rolled up to form a cylindrical body. An alternative form of construction comprises two layers of helically corrugated sheet cross-meshed and rolled up to form a cylindrical body. These catalyst bearing honeycombs are housed in a suitable container including means whereby it may be connected to the exhaust system. In order to ensure the maximum life for a catalyst structure, relative movement, i.e. vibration or rotation between the catalyst structure and the container must be avoided.
Hitherto the containers for catalyst assemblies have been produced from a pair of flanged half pressings. These half-pressings are brought together about the catalytic element until their flanges meet and are then welded together. This form of construction does not permit any adjustment of the cojntainer to accomodate dimensional tolerances which may occur in the manufacture of the catalytic elements. Consequently if the catalytic element is under size, the load to which it is subjected may not be sufficient to prevent vibration or rotation between the catalytic element and the container. If on the other hand, the catalytic element is over size, it will be subjected to a load in excess of that desired, which may result in damage to the catalytic element, especially where a ceramic catalyst piece is used.The present invention overcomes this difficulty by permitting adjustment of the dimensions of the catalyst container, so that a predetermined load may be applied to the catalytic element, regardless of dimensional tolerances.
According to one aspect of the present invention, a method of constructing a catalyst assembly comprises forming the catalyst container from a pair of sections which are adapted to be joined together with their edge portions in overlapping abutting relationship to form a pair of longitudinal seams, one edge portion of each abutting pair of edge portions being joggled outwardly so that the other edge portion of each pair may slide inside the joggled edge portion, a resilient catalytic element being located in one of the sections and the second section being applied to the first under pressure, so that the joggled and straight edge portion of each pair of edge portions interengage with one another in overlapping relationship and the resilient catalytic element is compressed the sections then being secured together.
Preferably the container is formed from a pair of half sections, these sections being produced by pressing. Both edges of one half section may be joggled. However, by joggling one edge of each section, only one configuration will be required, for a symmetrical assembly, thereby saving tooling costs. The joggled edges are arranged, so that the two sections may be moved together until the catalyst element is subjected to a predetermined load there being sufficient overlap of abutting edge portions to allow for adjustment of the dimensions of the container to accommodate the dimensional tolerances of the catalytic element.
According to a further aspect of the present invention a catalyst assembly comprises a resilient catalytic element surrounded by a catalyst container formed from a pair of sections, the adjacent edges of each of the sections abutting each other in overlapping relationship so as to present a substantially smooth inner surface and being secured together by suitable means.
The resilient catalytic element may be formed from a catalyst deposited in a resilient substrate, for example a metal honeycomb or reticulated cellular structure. It is preferred, however, to form the catalytic element from a catalyst piece formed from a metallic or ceramic, honeycomb or reticulated cellular structure, surrounded by a supporting layer of resilient material, for example, crimped wire or a fibrous mat. Where a layer of resilient material is used the annular area between the catalyst container and the catalyst piece should be sealed so that the exhaust gases passing through the catalyst assembly, will be restricted to the catalyst piece and not pass through the layer of resilient material.Several embodiments of the invention are now described, by way of example only, with reference to the accompanying drawings in which:
Figures la and b show sectional, side and end elevations, of a catalyst assembly formed in accordance with the present invention;
Figures 2a and b show a sectional side elevation and part sectional end elevation respectively, of an alternative form of catalyst assembly constructed in accordance with the present invention; and
Figures 3a and b show sectional, side and end elevations, of yet a further form of catalyst assembly formed in accordance with the present invention.
The catalyst assembly shown in Figs. 1 a and 6 comprises a metallic container 9 formed from two half pressings 10 and 11, the edge portions 12 of pressing 10 being joggled outwardly so that the adjacent edge portions
13 of pressing 11 may be engaged against the inner surfaces of the joggled edge portions 12 of pressing 10. The two half pressings 10 and 11 are secured together by welding along the seams 14. A catalytic element formed from a metallic or ceramic, honeycomb or reticulated cellular structure 15, surrounded by a layer of crimped wire 16 is located in the metal container 9, so that the metal container 9 exerts a high radial load upon the catalytic element, this load serving to prevent relative movement between the catalytic element 15, 16 and the container 9.
The half pressings 10 and 11 are provided with circumferential stiffening ribs 17.
A pair of frustoconical end fittings 18 are welded to the metal container 9 to form an outlet and inlet for the catalyst assembly, and inlet and outlets stubs 19 are welded to the smaller diameter ends of the end fittings 18, so that the catalyst assembly may be connected to the exhaust system of a motor vehicle. The outer cylindrical surface 20 of the metallic or ceramic, honeycomb or reticulated cellular structure 15 is non-porous and flange portions 21, on the end fittings 18, seal the annular portion between the metallic or ceramic, honeycomb or reticulated cellular structure 15 and the metal container 9 to prevent exhaust gases passing through the layer of crimped wire 16.
In order to construct the catalyst assembly shown in Figs. 1 a and b the catalytic element comprising catalyst piece 15 surrounded by a layer of crimped wire 16 is placed within a half pressing 10 which is located in a suitable die carried by the lower platen of a press. The other half pressing 11 is located in a suitable die attached to the upper platen of the press, and is moved into contact with the half pressing 10 so that the edge portions 13 of pressing 11 slide within the joggled edge portions 12 of pressing 10 and the catalytic element 15, 16 is compressed by a predetermined load. The two half pressings 10 and 11 are then tack welded along seams 14 and the assembly is then removed from the press.
The seams 14 are then welded fully and the end pieces 18 are inserted into the ends of the container 9 and welded in position. Likewise, the inlet and outlet stubs 19 are welded to the smaller diameter ends of the end pieces 18.
The catalyst assembly shown in Fig. 2a and b, is of similar construction to that shown in
Fig. 1. However, the cylndrical portion 32 of the container 29 and the frustoconical end pieces 33 are formed integrally by the two half pressings 30 and 31. In this form of construction, the metal container 29 abuts the edges 35 of the catalyst piece 15 to seal the annular portion between the catalyst piece 15 and the container 29. In order to facilitate fixing of the inlet and outlet stubs 19, the joggled edges 34 of the half pressing 30 are terminated short of the end of the frustoconical portions 33 of the container 29.
In the further embodiment shown in Fig. 3a and b, one edge of each of the half pressings 40, 41 are joggled so that a single pressing may be used for both halves. This further embodiment is also arranged to accommodate two catalyst pieces 46, 47 with an air gap between the two. In order to seal the gaps between the catalyst pieces 46 and 47 and the metal container 39 formed by the half pressings 40, 41, a circumferential groove 48 is provided in the half pressings 40, 41 and this groove 48 engages the adjacent edges 49 of catalyst pieces.
While the catalyst assemblies described above are of elliptical cross-section, the method of construction covered by this invention may be used for catalyst assemblies of any cross-section. Also instead of stiffening ribs 17 which extend inwardly of the casing, outwardly extending ribs may be used. These stiffening ribs and the grooves 48 where applicable are conveniently formed when the sections of the container are formed, for example by pressing.
Claims (23)
1. A method of constructing a catalyst assembly comprising forming the catalyst container from a pair of sections which are adapted to be joined with their edge portions in overlapping abutting relationship to form a pair of longitudinal seams, one edge portion of each abutting pair of edge portions being joggled outwardly so that the other edge portion of each pair may slide inside the joggled edge portion, a resilient catalytic element being located in one of the sections and the second sections being applied to the first under pressure, so that the joggled and straight edge portion of each pair of edge portions inter-engage with one another in overlapping relationship and the catalytic element is compressed, the sections then being secured together.
2. A method according to Clasim 1 in which the resilient catalytic element is compressed by a predetermined load.
3. A method according to Claim 1 or 2 in which one edge portion of each section of the catalyst container is joggled.
4. A method according to any one of the proceeding Claims in which both sections of the catalyst container are of identical configuration.
5. A method according to any one of the proceeding Claims in which the sections of the catalyst container are formed by pressing from sheet metal.
6. A method according to any one of the proceeding Claims in which the sections of the catalyst container are formed with stiffening ribs.
7. A method according to any one of the proceeding Claims in which the sections of the catalyst container are secured together, after assembly, by welding.
8. A method according to any one of the proceeding Claims in which the sections of the catalyst container form a cylindrical assembly, to which a pair of frustoconical end fittings are secured.
9. A method according to any one of
Claims 1 to 7 in which the section of the catalyst container when assembled define a cylindrical central portion and frustoconical end portions.
10. A method according to Claim 9 in which the joggled edges of the sections of the catalyst container, are terminated short of the free ends of the frustoconical end portions, in order to facilitate the fixing of inlet and outlet stubs.
11. A method according to any one of the preceeding Claims in which the resilient catalytic element comprises a rigid ceramic honeycomb or reticulated cellular structure having catalyst deposited in the interstices thereof, said ceramic structure being surrounded by a layer of resilient material, a sealing layer being interposed between the ceramic structure and the layer of resilient material.
12. A method according to any one of
Claims 1 to 10 in which the resilient catalytic element is in the form of a metallic honeycomb or reticulated cellular structure, the catalyst being deposited in the interstices thereof.
13. A method according to Claim 12 in which the metallic honeycomb or reticulated cellular structure is surrounded by a layer of resilient material, a sealing layer being interposed between the metallic structure and the layer of resilient material.
14. A method according to Claim 11 or 13 in which the resilient material is crimped wire or a fibrous mat.
15. A method according to Claim 11, 13 or 14 in which formations are provided on the sections of the catalyst container and/or the frustoconical end fittings, which when the catalyst container is assembled about the catalytic element, seal the annular area between the container and the ceramic or metallic structure.
16. A method according to any one of the proceeding Claims in which the catalyst container is adapted to accommodate a plurality of catalytic elements, suitable formations being provided in the sections of the catalyst container to separate and locate each of the catalytic elements.
17. A method of constructing a catalyst assembly substantially as described herein with reference to the accompanying drawings.
18. A catalyst assembly comprising a resilient catalytic element surrounded by a catalyst container formed from a pair of sections, the adjacent edges of each of the sections abutting each other in overlapping relationship so as to present a substantially smooth inner surface and being secured together by suitable means.
19. A catalyst assembly as claimed in
Claim 18 in which the catalytic element is compressed in the catalyst container, by a predetermined load.
20. A catalyst assembly according to
Claim 18 or 19, and formed in accordance with the method claimed in any one of Claims 1 to 17.
21. A catalyst assembly substantially as described herein, with reference to and as shown in Fig. 1 of the accompanying drawings.
22. A catalyst assembly substantially as described herein, with reference to and as shown in, Fig. 2 of the accompanying drawings.
23. A catalyst assembly substantially as described herein, with reference to and as shown in, Fig. 3 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7911035 | 1979-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2047557A true GB2047557A (en) | 1980-12-03 |
Family
ID=10504209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8010201A Withdrawn GB2047557A (en) | 1979-03-29 | 1980-03-26 | Catalyst assembly for exhaust systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2047557A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0278455A2 (en) * | 1987-02-10 | 1988-08-17 | Paul Gillet Gmbh | Housing for the receipt of a monolithic ceramic body |
| EP0306705A2 (en) * | 1987-09-10 | 1989-03-15 | Emitec Gesellschaft für Emissionstechnologie mbH | Support structure for producing a catalytic reactor for purifying exhaust gas |
| EP0316595A1 (en) * | 1987-11-18 | 1989-05-24 | Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co. KG | Carrier for a catalytic reactor for cleaning flue gas |
| US4925634A (en) * | 1983-05-13 | 1990-05-15 | Sankei Giken Kogyo Kabushiki Kaisha | Catalytic converter for use with internal combustion engine |
| EP1074703A1 (en) * | 1999-08-04 | 2001-02-07 | J. Eberspächer GmbH & Co. | A method of producing a catalyst, especially prefabricating a catalyst housing or tube of modular construction and prefabricated tube produced thereby |
| CN105545427A (en) * | 2014-10-27 | 2016-05-04 | 埃贝斯佩歇排气技术有限责任两合公司 | Exhaust gas treatment device and method for manufacturing an exhaust gas treatment device |
-
1980
- 1980-03-26 GB GB8010201A patent/GB2047557A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4925634A (en) * | 1983-05-13 | 1990-05-15 | Sankei Giken Kogyo Kabushiki Kaisha | Catalytic converter for use with internal combustion engine |
| EP0278455A2 (en) * | 1987-02-10 | 1988-08-17 | Paul Gillet Gmbh | Housing for the receipt of a monolithic ceramic body |
| EP0278455A3 (en) * | 1987-02-10 | 1990-01-31 | Paul Gillet Gmbh | Housing for the receipt of a monolithic ceramic body |
| EP0306705A2 (en) * | 1987-09-10 | 1989-03-15 | Emitec Gesellschaft für Emissionstechnologie mbH | Support structure for producing a catalytic reactor for purifying exhaust gas |
| EP0306705A3 (en) * | 1987-09-10 | 1989-07-12 | Suddeutsche Kuhlerfabrik Julius Fr. Behr Gmbh & Co. Kg | Support structure for producing a catalytic reactor for purifying exhaust gas |
| EP0316595A1 (en) * | 1987-11-18 | 1989-05-24 | Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co. KG | Carrier for a catalytic reactor for cleaning flue gas |
| EP1074703A1 (en) * | 1999-08-04 | 2001-02-07 | J. Eberspächer GmbH & Co. | A method of producing a catalyst, especially prefabricating a catalyst housing or tube of modular construction and prefabricated tube produced thereby |
| CN105545427A (en) * | 2014-10-27 | 2016-05-04 | 埃贝斯佩歇排气技术有限责任两合公司 | Exhaust gas treatment device and method for manufacturing an exhaust gas treatment device |
| CN105545427B (en) * | 2014-10-27 | 2018-11-13 | 埃贝斯佩歇排气技术有限责任两合公司 | Exhaust gas treatment device and method for manufacturing exhaust gas treatment device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |