CA1102707A - Apparatus for catalytic purifying the effluent gases of internal combustion engines - Google Patents
Apparatus for catalytic purifying the effluent gases of internal combustion enginesInfo
- Publication number
- CA1102707A CA1102707A CA280,763A CA280763A CA1102707A CA 1102707 A CA1102707 A CA 1102707A CA 280763 A CA280763 A CA 280763A CA 1102707 A CA1102707 A CA 1102707A
- Authority
- CA
- Canada
- Prior art keywords
- seal ring
- catalyst body
- housing
- internal combustion
- diameter
- 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.)
- Expired
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
- F01N3/24—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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus for catalytic purification of internal combustion gases wherein a cylindrical catalyst body is housed in an external housing between which a shock absorb-ing resilient envelope is interposed. A seal ring is pro-vided at at least one end of the body extending outwardly from the frontal edge into abutment with the housing.
Apparatus for catalytic purification of internal combustion gases wherein a cylindrical catalyst body is housed in an external housing between which a shock absorb-ing resilient envelope is interposed. A seal ring is pro-vided at at least one end of the body extending outwardly from the frontal edge into abutment with the housing.
Description
7~;7 The present invention relates to apparatus for the catalytic purification of the exhaust gases in internal com-bustion engine~ wherein a cylindrical catalyst body traversed by the gas in the axial direction, is arranged in the interior of a sheet metal housing and is shock-dampened by means of a resiLient envelope provided at its circumference which also seals the body relative to an outer housing.
When using delicate ceramic envelope materials~ for example, on aluminum silicate base, premature wear thereof will occur without special sealing of the envelope at its end face Such wear is caused on the one hand by the exhaust gas pulsations and on the other hand by the corrosive attack of the exhaust gases on the free front surface o the envelope To avoid this disadvantage, it has been proposed in German Patent Publication P 25 15 732, corresponding to Canadian Patent-1064399, dated 10/10/79, to deflect the e~-hause gases into the interior of the catalyst body by sheet metal rings fastened to the housing. Such a measure gives I
no protection against chemical corrosion.
The problem underlying the invention is to seal ~: the space between the catalyst body and the housing in a ¦ manner which not only ensures the complete closure thereof l ~ but also serves to retain the catalyst body.
~: .
~ .(;~ , ~.
... ... . . ~, . .. . . . .. . .
.7~7 According to the invention, this problem is solved by working, smoothing and/or sizing the catalyst body at its circumferential zone contiguous to at least one of its frontal edges and fitting thereon an elastic seal ring which extends beyond the frontal edge. The seal ring is radially extended to be forcibly applied at its free end against the inside of the outer housing wall about the entire circumference of the housing. Such a seal ring contributes both to the radial and to the axial retention of the catalyst body and achieves an elastic support of the catalyst body in the area o its oppo-site front edges.
At the same time the seal provides a hermetic closure of the space containing the shock-absorbing envelope between the catalyst body and the housing surrounding the latter. A precise sizing or working, i.e., smoothing, o the circumference of the catalyst body is necessary only in a limited area contiguous to the end faces. For the purpose of sizing, a layer of a cement type material, for example a mater-ial available on the market under the designation of BLAKITE, a TM of the Johns Manville Co., is applied. This layer causes an increased compression of the envelope in radial direction, whereby in particular the axial hold of the catalyst body is ~ improved.
- The assembly of the apparatus is facilitated by the ~act that the housing may be divided into two hal shells.
The catalyst body, provided with the seal rings and wrapped -~.
`' - 2 -, .
- with a shock attenuating elastic envelope, is placed into the lower half shell; then the upper half shell is pressed on, while clamping the free end sections of the seal rings relative to thè inner wall of the housing~ Thereafter, the two sections of the housing are together. After the union of the two half shells, the free end sections of the seal rings can be fixed relative to the shells by spot welding.
To achieve an improved spring action of the seal rings, the housing may have an annular axial enlargement in the contact area with the free end section of the seal ring, while the ring itself may be both radially and axially en-larged to firmly seat against the housing wall over an en-larged area. Thereby the free end section of the seal ring . presses against the inner wall of the hou~ing independently of the clamping of the resilient envelope to the housing.
. At the same -time the enlargement serves to provide a certain axial fixa~ion of the catalyst body~ as the free end section of the seal ring engages securely in locking form against ; the housing.
. An improvement of the exhaust gas.conduction can be further achieved by reducing the diameter of the seal ring radiall~ inward, in its middle sectîon This concen-trates the exhaust gases closer to the axis of the catalyst since the smallest diameter of the rîng is smaller than the outside diameter of the catalyst body. With this form of exhaust gas conduction, an optimaL utilization of the effec-tive surface of the catalyst body during flow through it is : obtained . ~
~ ~ 2~
An example of construction of the device according to the invention is e~plained in the following description with reference to the accompanying drawing~ in which:
FIG 1 is an axial section through the catalyst device;
FIG 2 is a transverse section along II-II o~
FIG l; and FIG 3 is an enlarged view of a segment of a sea-l-ring shown in FIG 1, iliustrating its construction in cross-section.
The catalyst body 1 is a monolithic, subs~antlally cylindrical or uniform cross-sectional axiall~ traversible block, carrying about its circumference, a resilient envelope
When using delicate ceramic envelope materials~ for example, on aluminum silicate base, premature wear thereof will occur without special sealing of the envelope at its end face Such wear is caused on the one hand by the exhaust gas pulsations and on the other hand by the corrosive attack of the exhaust gases on the free front surface o the envelope To avoid this disadvantage, it has been proposed in German Patent Publication P 25 15 732, corresponding to Canadian Patent-1064399, dated 10/10/79, to deflect the e~-hause gases into the interior of the catalyst body by sheet metal rings fastened to the housing. Such a measure gives I
no protection against chemical corrosion.
The problem underlying the invention is to seal ~: the space between the catalyst body and the housing in a ¦ manner which not only ensures the complete closure thereof l ~ but also serves to retain the catalyst body.
~: .
~ .(;~ , ~.
... ... . . ~, . .. . . . .. . .
.7~7 According to the invention, this problem is solved by working, smoothing and/or sizing the catalyst body at its circumferential zone contiguous to at least one of its frontal edges and fitting thereon an elastic seal ring which extends beyond the frontal edge. The seal ring is radially extended to be forcibly applied at its free end against the inside of the outer housing wall about the entire circumference of the housing. Such a seal ring contributes both to the radial and to the axial retention of the catalyst body and achieves an elastic support of the catalyst body in the area o its oppo-site front edges.
At the same time the seal provides a hermetic closure of the space containing the shock-absorbing envelope between the catalyst body and the housing surrounding the latter. A precise sizing or working, i.e., smoothing, o the circumference of the catalyst body is necessary only in a limited area contiguous to the end faces. For the purpose of sizing, a layer of a cement type material, for example a mater-ial available on the market under the designation of BLAKITE, a TM of the Johns Manville Co., is applied. This layer causes an increased compression of the envelope in radial direction, whereby in particular the axial hold of the catalyst body is ~ improved.
- The assembly of the apparatus is facilitated by the ~act that the housing may be divided into two hal shells.
The catalyst body, provided with the seal rings and wrapped -~.
`' - 2 -, .
- with a shock attenuating elastic envelope, is placed into the lower half shell; then the upper half shell is pressed on, while clamping the free end sections of the seal rings relative to thè inner wall of the housing~ Thereafter, the two sections of the housing are together. After the union of the two half shells, the free end sections of the seal rings can be fixed relative to the shells by spot welding.
To achieve an improved spring action of the seal rings, the housing may have an annular axial enlargement in the contact area with the free end section of the seal ring, while the ring itself may be both radially and axially en-larged to firmly seat against the housing wall over an en-larged area. Thereby the free end section of the seal ring . presses against the inner wall of the hou~ing independently of the clamping of the resilient envelope to the housing.
. At the same -time the enlargement serves to provide a certain axial fixa~ion of the catalyst body~ as the free end section of the seal ring engages securely in locking form against ; the housing.
. An improvement of the exhaust gas.conduction can be further achieved by reducing the diameter of the seal ring radiall~ inward, in its middle sectîon This concen-trates the exhaust gases closer to the axis of the catalyst since the smallest diameter of the rîng is smaller than the outside diameter of the catalyst body. With this form of exhaust gas conduction, an optimaL utilization of the effec-tive surface of the catalyst body during flow through it is : obtained . ~
~ ~ 2~
An example of construction of the device according to the invention is e~plained in the following description with reference to the accompanying drawing~ in which:
FIG 1 is an axial section through the catalyst device;
FIG 2 is a transverse section along II-II o~
FIG l; and FIG 3 is an enlarged view of a segment of a sea-l-ring shown in FIG 1, iliustrating its construction in cross-section.
The catalyst body 1 is a monolithic, subs~antlally cylindrical or uniform cross-sectional axiall~ traversible block, carrying about its circumference, a resilient envelope
2 made of an aluminum silicate based material, for example a material commercially available under the designation and trademark Cera Blanket or Saffil. The Cera Blanket is a mat o firepro~f ceramic fibres of about 60% aluminum oxide and Na2), 39% silicon dioxide and a small remainder of FeO3,TiO2.
SafiL is a mat of fireproof ceramic fibres of about 95%
aluminum oxide and 5% silicon dioxide, with some trace elements.***
The envelope 2 clamps the eatalyst body 1 in radial direction relative to the sheet metal housing 3, which surrounds it.
The sheet metal housing has inwardly tapering ends, which has ***Foo~no~e: The manufacturer of Saffil is ICI-Imperial ChemicaL Industries, Ltd., Runcorn, Cheshire, England, and o Blakite and Cer~ablanket is Johns-ManvilLe International Gorp., New York, U.S.A.
.~ .. . .
... ~,, . , . .. , , ~ .. , . .. . ,~, .. .. . .. .. ..... ......... . . . . . . .....
-~ ~ Z7 ~ 7 a form corresponding to the catalyst body 1 and is provided in known measure with means of connection to the exhause of an engine. In the present instance the form of the catalyst body and housing is approximately elliptical in cross-section as seen in FIG 2. Pre~erably, the housing is slightly sm~ller in its diameters so as to apply a tight closing pressure on the envelope 2 and catalyst body 1. The catalyst body 1 is formed~ in its circumferential end zones 4 (contiguous to the frontal edges) with recessed surfaces on which is fit a ringO
5. The catalyst body is sized at the zones 4, by appli-cation of a cement type mass, e.g. of a material commercially available under the aforementioned TM BLAKITE. BLAKITE is a mortar comprising fireproof clay and cyanite mixed with water glass; water glass being another expression for sodium-tetrasilicate. The term sized as used herein means to treat the catalyst body on its circumferential zones 4 as by coating the same with the mortar or other material until a certain outer diameter is reached within small tolerances for the set up and close fit of the rings 5. The rings 5, are resilient seal rings formed of suitable metal which are seated onto these recessed surfaces so as to be axially fLx-ed at their outer end and to have their free outer end sec-tions 6 radially extended in an arched portion 7 which engages the housing 3. The end sections 6 may be connected with the housing by spot welding in the region of the arched portions 7 forming an annular enlargement of the rings 5, beyond the - - 5 ~
~ Z7~7 diameter of the catalyst body. The resilient envelope mater-ial is at least partially pulled over the seal rings S in the end region of the catalyst body 1, As can be seen in FIG 2, the outer metallic housing
SafiL is a mat of fireproof ceramic fibres of about 95%
aluminum oxide and 5% silicon dioxide, with some trace elements.***
The envelope 2 clamps the eatalyst body 1 in radial direction relative to the sheet metal housing 3, which surrounds it.
The sheet metal housing has inwardly tapering ends, which has ***Foo~no~e: The manufacturer of Saffil is ICI-Imperial ChemicaL Industries, Ltd., Runcorn, Cheshire, England, and o Blakite and Cer~ablanket is Johns-ManvilLe International Gorp., New York, U.S.A.
.~ .. . .
... ~,, . , . .. , , ~ .. , . .. . ,~, .. .. . .. .. ..... ......... . . . . . . .....
-~ ~ Z7 ~ 7 a form corresponding to the catalyst body 1 and is provided in known measure with means of connection to the exhause of an engine. In the present instance the form of the catalyst body and housing is approximately elliptical in cross-section as seen in FIG 2. Pre~erably, the housing is slightly sm~ller in its diameters so as to apply a tight closing pressure on the envelope 2 and catalyst body 1. The catalyst body 1 is formed~ in its circumferential end zones 4 (contiguous to the frontal edges) with recessed surfaces on which is fit a ringO
5. The catalyst body is sized at the zones 4, by appli-cation of a cement type mass, e.g. of a material commercially available under the aforementioned TM BLAKITE. BLAKITE is a mortar comprising fireproof clay and cyanite mixed with water glass; water glass being another expression for sodium-tetrasilicate. The term sized as used herein means to treat the catalyst body on its circumferential zones 4 as by coating the same with the mortar or other material until a certain outer diameter is reached within small tolerances for the set up and close fit of the rings 5. The rings 5, are resilient seal rings formed of suitable metal which are seated onto these recessed surfaces so as to be axially fLx-ed at their outer end and to have their free outer end sec-tions 6 radially extended in an arched portion 7 which engages the housing 3. The end sections 6 may be connected with the housing by spot welding in the region of the arched portions 7 forming an annular enlargement of the rings 5, beyond the - - 5 ~
~ Z7~7 diameter of the catalyst body. The resilient envelope mater-ial is at least partially pulled over the seal rings S in the end region of the catalyst body 1, As can be seen in FIG 2, the outer metallic housing
3 is divided into two half shells 3a and 3b, which are con-nected together by spot welding at their laterally circling flanges 8, FIG 3 shows a segment of a seal ring 5 which is provided with a radiaLly inward cross-section annular reduction of foLd 9, which has an inner diameter smaller than the out-side diameter of the catalyst bodyO The latter fold causes a def.lection of the exhaust gas stream from its axial path radially, hence concentrating the gas stream. The fold also enables the ring to be radially and axially movable.
It wilL be seen from the foregoing that the various objects and advantages of the present invention, enumerated earlier, are all obtained in simple economical fashion. Var-ious modifications and changes have been suggested in the foregoing description. Others will be obvious to those .
skilled.in this art, Consequently, it is intended that the present disclosure be illustrative only and not limiting of the sclope of the invention.
.
. ' ;, :
It wilL be seen from the foregoing that the various objects and advantages of the present invention, enumerated earlier, are all obtained in simple economical fashion. Var-ious modifications and changes have been suggested in the foregoing description. Others will be obvious to those .
skilled.in this art, Consequently, it is intended that the present disclosure be illustrative only and not limiting of the sclope of the invention.
.
. ' ;, :
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for catalytic purification of exhaust gases in an internal combustion engine comprising a catalyst body adapted to be traversed by said gases in the axial di-rection, a sheet metal housing surrounding said body and a shock absorbing envelope interposed therebetween, a seal ring secured about the circumference of said body, adjacent at least one end thereof, said seal ring extending beyond the frontal edge of said one end and having a free section abut-ting against the inside surface of said housing about the entire circumference thereof, said catalyst body being sized in a circumferential zone about said body adjacent said at least one end thereof, so that said seal ring may be fit thereto, by applying a layer of cement type material between the catalyst body and said seal ring in said circumferential zone and said housing having an annular surface enlarged in the radial direction receiving the free end section of the seal ring for sealing said ring.
2. The apparatus according to claim 1 wherein said seal ring is formed in its middle section with a radially in-wardly directed annulus of a reduced diameter serving to con-centrate the exhaust gas.
3. The apparatus according to claim 2, wherein said housing comprises a pair of two half shells and means joining said half shells together along their edges.
4. The apparatus according to claim 2, wherein the diameter of said inwardly directed annulus is smaller than the outside diameter of the catalyst body.
5. The apparatus according to claim 2, wherein the frontal edge of said catalyst body is recessed to receive the end of said seal ring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2627596.7 | 1976-06-19 | ||
| DE19762627596 DE2627596C3 (en) | 1976-06-19 | 1976-06-19 | Device for the catalytic cleaning of exhaust gases from internal combustion engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1102707A true CA1102707A (en) | 1981-06-09 |
Family
ID=5980978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA280,763A Expired CA1102707A (en) | 1976-06-19 | 1977-06-17 | Apparatus for catalytic purifying the effluent gases of internal combustion engines |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1102707A (en) |
| DE (1) | DE2627596C3 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54134214A (en) * | 1978-04-08 | 1979-10-18 | Fuji Heavy Ind Ltd | Catalytic converter for purifying exhaust gas of automobile |
| US4206179A (en) * | 1978-04-08 | 1980-06-03 | Fuji Jukogyo Kabushiki Kaisha | Apparatus for purifying exhaust gases of internal combustion engines |
| DE3406721A1 (en) * | 1984-02-24 | 1985-09-12 | LEISTRITZ Maschinenfabrik GmbH, 8500 Nürnberg | Catalytic emission control device |
| EP0193072B1 (en) * | 1985-02-22 | 1989-04-12 | Leistritz Aktiengesellschaft | Catalytic-emission control device |
| DE8817016U1 (en) * | 1988-11-04 | 1991-12-19 | Heinrich Gillet GmbH & Co KG, 6732 Edenkoben | Exhaust catalyst for motor vehicles |
| DE102012017178A1 (en) | 2012-03-10 | 2013-09-12 | Volkswagen Aktiengesellschaft | exhaust gas purification device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2222663C3 (en) * | 1972-05-09 | 1975-03-06 | Zeuna-Staerker Kg, 8900 Augsburg | Process for the production of a device for cleaning the exhaust gases of internal combustion engines |
| DE2303789B2 (en) * | 1973-01-26 | 1975-01-30 | Zeuna-Staerker Kg, 8900 Augsburg | Device for the analytical cleaning of the exhaust gases from internal combustion engines |
| DE2245535C2 (en) * | 1972-09-16 | 1983-04-21 | Fa. J. Eberspächer, 7300 Esslingen | Device for the catalytic cleaning of exhaust gases from internal combustion engines |
-
1976
- 1976-06-19 DE DE19762627596 patent/DE2627596C3/en not_active Expired
-
1977
- 1977-06-17 CA CA280,763A patent/CA1102707A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2627596A1 (en) | 1978-02-02 |
| DE2627596C3 (en) | 1981-04-09 |
| DE2627596B2 (en) | 1980-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |