US20130283765A1 - Insert, holder and post-treatment unit for exhaust gases - Google Patents
Insert, holder and post-treatment unit for exhaust gases Download PDFInfo
- Publication number
- US20130283765A1 US20130283765A1 US13/990,068 US201113990068A US2013283765A1 US 20130283765 A1 US20130283765 A1 US 20130283765A1 US 201113990068 A US201113990068 A US 201113990068A US 2013283765 A1 US2013283765 A1 US 2013283765A1
- Authority
- US
- United States
- Prior art keywords
- holder
- insert
- sealing ring
- socket
- post
- 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.)
- Abandoned
Links
- 239000007789 gas Substances 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 36
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D27/00—Cartridge filters of the throw-away type
- B01D27/08—Construction of the casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/30—Filter housing constructions
- B01D35/306—Filter mounting adapter
-
- 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
-
- 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
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
- F01N13/1827—Sealings specially adapted for exhaust systems
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/0211—Arrangements for mounting filtering elements in housing, e.g. with means for compensating thermal expansion or vibration
-
- 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
- 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
- F01N3/2867—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 the mats or gaskets being placed at the front or end face of catalyst body
-
- 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
- F01N3/2875—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration by using elastic means, e.g. spring leaves, for retaining catalyst body in the 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
- F01N3/2878—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration by using non-elastic means for retaining catalyst body in the housing, e.g. a metal chamfer, or by corrugation or deformation of the metal 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
- F01N2450/16—Methods or apparatus for fitting, inserting or repairing different elements by using threaded joints
-
- 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
- F01N2450/30—Removable or rechangeable blocks or cartridges, e.g. for filters
-
- 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 invention relates to an insert for a holder in a post-treatment unit for exhaust gases of a combustion engine, comprising a socket for a treatment component intended to have flowing through it the exhaust gases which are to be treated, connecting means for holding the insert in position in the holder, and sealing means for gastight closure of the socket relative to the holder.
- the invention relates also to a holder for such an insert and a post-treatment unit provided with such an insert.
- the treatment component may be, for example, an oxidation catalyst, an SCR (selective catalytic reduction) catalyst or a wall flow filter.
- an oxidation catalyst for example, an SCR (selective catalytic reduction) catalyst or a wall flow filter.
- a known seal for such an insert comprises a so-called V-seal. After each extraction, such a seal needs to be replaced by a new seal, since it will have become plastically deformed and will no longer be tight enough when the insert is reconnected to the holder for the post-treatment unit to be able to meet the prevailing requirements with regard to exhaust emissions. Today's emission requirements often do not allow even an occasional percentage of the exhaust gases to leak past the inserts in the post-treatment unit.
- An object of the invention is to propose an inset of the kind indicated in the introduction which has an effective seal and is easy to remove and put back without needing to replace the seal.
- said sealing means comprises a sealing ring on the socket to cooperate in self-centering seat engagement with an opposite sealing ring in the holder.
- a sealing arrangement which may in principle be regarded as working like a valve seat seal, has great sealing performance and can be reinserted many times.
- the annular embodiment also makes the seal flexurally elastic in the circumferential direction so that the, for example, conical self-centering forces the rings to tight linear abutment against one another when the insert is connected to the holder.
- the sealing rings are made of hard material, e.g. metal, particularly steel, although ceramic material is also conceivable.
- the sealing rings may also be machined, e.g. turned or ground, to high surface fineness for optimum sealing performance. The surface fineness may be such that the closure becomes tight enough to meet prevailing emission requirements, e.g. the current Euro 6.
- the sealing ring may also be located in respective corner recesses of the socket and the holder.
- connection to hold the insert in position in the holder may comprise a threaded connection.
- a connection possibly verified by monitoring of tightening torque, is an easy way of achieving good and correct abutment force between the sealing rings.
- the threaded connection may comprise an outside thread on the socket to engage with an inside thread on the holder. This makes it possible for the insert to be fitted in the holder in a single operation.
- An outer end of the socket may also have a recess situated at a circumference for a tool to fasten and release the connection.
- FIG. 1 is a perspective view of an exhaust post-treatment unit which may be provided with an insert according to the invention
- FIG. 2 is a side view, partly in section, of an insert according to the invention sealingly connected to a holder for an exhaust post-treatment unit;
- FIG. 3 is a side view of an insert according to the invention partly inserted in a holder of a schematically depicted exhaust post-treatment unit;
- FIG. 4 is a cross-sectional view on a larger scale, with portions cut away, of a seal according to the invention between an insert and a holder of an exhaust post-treatment unit;
- FIG. 5 is a perspective view in cross-section, with portions cut away, of a cover arrangement for an exhaust post-treatment unit
- FIG. 6 is a cross-sectional view on a larger scale, with portions cut away, of a closure region between a cover arrangement and an exhaust post-treatment unit;
- FIG. 7 is a perspective view, with portions cut away, of a cover tightener for a cover arrangement.
- FIG. 8 depicts schematically an example of a cover tightener with an eccentric clamping means.
- FIG. 1 depicts an exhaust post-treatment unit 10 for an undepicted combustion engine, e.g. a diesel engine of, for example, a freight vehicle.
- the post-treatment unit 10 comprises in a known way a housing 12 with inlet and outlet apertures not depicted in detail for the exhaust gases from the engine.
- the unit 10 may have one or more interchangeable inserts, e.g. the insert 50 represented by a broken line in FIG. 1 , each comprising a treatment component containing a substrate arranged to have the exhaust gases flowing through it, e.g. an oxidation catalyst, an SCR catalyst or a wall flow filter.
- the insert 50 has a thin-walled sleeve 52 or so-called “sleeving pipe”, which is open at both ends and into which the substrate 70 is pushed and is then axially fixed by a pair of mutually opposite locking rings 72 which are themselves fixed by annular shoulders 74 formed at the mutually opposite ends of the sleeve 52 .
- the substrate 70 may also have radial support in the form of an inner sleeve 76 made of a suitable, e.g. shock-absorbing or vibration-damping, material.
- the insert 50 may be inserted in and removed from the post-treatment unit 10 through an aperture 16 with a cover 30 in the housing 12 . More specifically, the insert 50 may be pushed into and pulled out from a holder 22 integrated in an exhaust duct 20 which in an undepicted way is welded in position in the housing 12 .
- the other end of the sleeve 52 is further provided with an outside thread 54 for engagement with an inside thread 24 of the holder 22 so that the insert 50 can be firmly connected in the duct 20 .
- An axial outer flange 56 at the outer edge of the sleeve 52 may further have a number of recesses 58 evenly distributed round the circumference to engage with an undepicted tool for pulling out and releasing the insert 50 in the holder 22 of the duct 20 .
- annular seal 80 between the inner end of the sleeve 52 and the holder 22 .
- the annular seal 80 comprises a pair of sealing means in the form of sealing rings 82 , 84 which cooperate by substantially linear contact and are made of a suitable grade of steel.
- the sealing rings 82 , 84 may be located in, for example, respective suitably shaped corner recesses of the sleeve 52 and the holder 22 and be connected in the recesses by suitable joints 86 , e.g. welded or soldered joints or possibly some other tight form of joint such as binding agent capable of withstanding the high temperatures from the exhaust gases flowing past.
- the seal 80 is self-centering due to the fact that one, 84 ′, of the sealing surfaces 82 ′, 84 ′ of the rings 82 , 84 is conical, so that the seal 80 works in principle like a seat valve when the sleeve 52 of the insert 50 is screwed firmly into the holder 22 of the duct 20 .
- the rings 82 , 84 may of course also be of reverse configuration so that the conical surface is on the sealing ring 82 of the sleeve 52 (not depicted).
- the cooperating sealing surfaces 82 ′, 84 ′ are with advantage also machined, e.g. turned and where appropriate ground, to high surface fineness in order further to improve the sealing performance.
- FIG. 1 it also depicts an openable cover arrangement 30 for a circular access aperture 16 in a sheetmetal wall 14 of the silencer/post-treatment unit 10 .
- the arrangement 30 comprises a cover 32 with a cover tightener 40 .
- the cover 32 like a lid for paint cans, is made of a piece of sheetmetal, e.g. sheet steel, with a covering cover disc 34 which has a curvature v, and a suitably slightly conical elastic sealing flange 38 intended to sealingly engage with an edge of the aperture 16 when the cover 30 is pressed into the aperture 16 .
- a cover tightener 40 is made of a piece of sheetmetal, e.g. sheet steel, with a covering cover disc 34 which has a curvature v, and a suitably slightly conical elastic sealing flange 38 intended to sealingly engage with an edge of the aperture 16 when the cover 30 is pressed into the aperture 16 .
- the edge of the aperture 16 is delineated by an inner flange 18 which may likewise, but need not necessarily, be slightly conical.
- the edge of the aperture 16 need not necessarily consist of a flange 18 but may possibly also be a circular inner edge with a possibly rounded cross-section (not depicted).
- the cover tightener 40 can clamp the cover 32 in a fitted state as depicted in FIG. 6 .
- the lock tightener 40 has a supporting frame comprising a pair of mutually crossing supporting members or supporting arms 42 with diametrically opposite angled ends 44 which are firmly connected, e.g. welded or soldered, to the inside of the sealing flange 38 .
- a clamping means in the form of a clamping screw 46 with a locknut 48 is threadedly connected to the supporting arms 42 in their crossing region. The free end of the screw 46 engages with the curved cover disc 34 so that when the screw 46 is tightened its free end presses against the central region of the cover disc 34 and reduces the curvature.
- each supporting arm 42 may if necessary have, for example, a curved cross-section to prevent outward deflection of the supporting arm 42 when the clamping screw 46 is tightened.
- cover tightener 40 may for example take the form of a supporting disc made of a piece of sheetmetal with recesses which delineate a suitable number of radial supporting arms or spokes 42 .
- FIG. 8 depicts schematically a cover tightener 40 with a clamping means 90 comprising an eccentric element 92 supported pivotably in an aperture in the supporting frame 42 and manoeuvrable by means of a handle 94 to alter the curvature of the cover disc 34 between the respective states represented by chain-dotted and continuous lines.
- cover disc it is also conceivable for the cover disc to curve in the opposite direction (i.e. inwards into the aperture) from that depicted in the drawing and for the clamping device then to exert tensile force instead of pressure on the cover disc (not depicted).
Abstract
An insert (50) for a holder (22) in a post-treatment unit (10) for exhaust gases of a combustion engine, has a socket (52) for a treatment component (70) intended to have flowing through it the exhaust gases which are to be treated, a connector (54) for holding the insert (50) in position in the holder (22), and a seal (82) for gastight closure of the socket (52) relative to the holder (22). The seal includes a sealing ring (82) on the socket (52) for cooperation in self-centering seat engagement with an opposite sealing ring (84) in the holder.
Description
- The invention relates to an insert for a holder in a post-treatment unit for exhaust gases of a combustion engine, comprising a socket for a treatment component intended to have flowing through it the exhaust gases which are to be treated, connecting means for holding the insert in position in the holder, and sealing means for gastight closure of the socket relative to the holder. The invention relates also to a holder for such an insert and a post-treatment unit provided with such an insert.
- To meet increasingly stringent emission requirements, vehicle manufacturers have long resorted to exhaust post-treatment. This treatment is performed in various catalysts and filters which transform the exhaust gases chemically or physically so that only a small amount of the undesirable substances can escape from the exhaust pipe. In an insert of the kind indicated above the treatment component may be, for example, an oxidation catalyst, an SCR (selective catalytic reduction) catalyst or a wall flow filter. For substrates with coatings used in the filters and catalysts to perform their function, they often need to be extractable from the post-treatment unit/silencer for reconditioning, e.g. for cleaning, emptying of ash residues which cause large back-pressures and possibly for replacement of the treatment components. A known seal for such an insert comprises a so-called V-seal. After each extraction, such a seal needs to be replaced by a new seal, since it will have become plastically deformed and will no longer be tight enough when the insert is reconnected to the holder for the post-treatment unit to be able to meet the prevailing requirements with regard to exhaust emissions. Today's emission requirements often do not allow even an occasional percentage of the exhaust gases to leak past the inserts in the post-treatment unit.
- An object of the invention is to propose an inset of the kind indicated in the introduction which has an effective seal and is easy to remove and put back without needing to replace the seal.
- This is achieved by the features indicated in the claims set out below.
- According to a version of the invention, said sealing means comprises a sealing ring on the socket to cooperate in self-centering seat engagement with an opposite sealing ring in the holder. Such a sealing arrangement, which may in principle be regarded as working like a valve seat seal, has great sealing performance and can be reinserted many times. The annular embodiment also makes the seal flexurally elastic in the circumferential direction so that the, for example, conical self-centering forces the rings to tight linear abutment against one another when the insert is connected to the holder.
- The sealing rings are made of hard material, e.g. metal, particularly steel, although ceramic material is also conceivable. The sealing rings may also be machined, e.g. turned or ground, to high surface fineness for optimum sealing performance. The surface fineness may be such that the closure becomes tight enough to meet prevailing emission requirements, e.g. the current Euro 6.
- The sealing ring may also be located in respective corner recesses of the socket and the holder.
- The connection to hold the insert in position in the holder may comprise a threaded connection. Such a connection, possibly verified by monitoring of tightening torque, is an easy way of achieving good and correct abutment force between the sealing rings.
- The threaded connection may comprise an outside thread on the socket to engage with an inside thread on the holder. This makes it possible for the insert to be fitted in the holder in a single operation.
- An outer end of the socket may also have a recess situated at a circumference for a tool to fasten and release the connection.
- Other features and advantages of the invention may be indicated by the claims and the description set out below of embodiment examples.
-
FIG. 1 is a perspective view of an exhaust post-treatment unit which may be provided with an insert according to the invention; -
FIG. 2 is a side view, partly in section, of an insert according to the invention sealingly connected to a holder for an exhaust post-treatment unit; -
FIG. 3 is a side view of an insert according to the invention partly inserted in a holder of a schematically depicted exhaust post-treatment unit; -
FIG. 4 is a cross-sectional view on a larger scale, with portions cut away, of a seal according to the invention between an insert and a holder of an exhaust post-treatment unit; -
FIG. 5 is a perspective view in cross-section, with portions cut away, of a cover arrangement for an exhaust post-treatment unit; -
FIG. 6 is a cross-sectional view on a larger scale, with portions cut away, of a closure region between a cover arrangement and an exhaust post-treatment unit; -
FIG. 7 is a perspective view, with portions cut away, of a cover tightener for a cover arrangement; and -
FIG. 8 depicts schematically an example of a cover tightener with an eccentric clamping means. - The same reference numbers are used throughout the drawings to denote items with the same or similar functions.
-
FIG. 1 depicts anexhaust post-treatment unit 10 for an undepicted combustion engine, e.g. a diesel engine of, for example, a freight vehicle. Thepost-treatment unit 10 comprises in a known way ahousing 12 with inlet and outlet apertures not depicted in detail for the exhaust gases from the engine. Theunit 10 may have one or more interchangeable inserts, e.g. theinsert 50 represented by a broken line inFIG. 1 , each comprising a treatment component containing a substrate arranged to have the exhaust gases flowing through it, e.g. an oxidation catalyst, an SCR catalyst or a wall flow filter. - As illustrated in
FIG. 2 , theinsert 50 has a thin-walled sleeve 52 or so-called “sleeving pipe”, which is open at both ends and into which thesubstrate 70 is pushed and is then axially fixed by a pair of mutuallyopposite locking rings 72 which are themselves fixed byannular shoulders 74 formed at the mutually opposite ends of thesleeve 52. Thesubstrate 70 may also have radial support in the form of aninner sleeve 76 made of a suitable, e.g. shock-absorbing or vibration-damping, material. - As partly schematically further depicted in
FIG. 3 , theinsert 50 may be inserted in and removed from thepost-treatment unit 10 through anaperture 16 with acover 30 in thehousing 12. More specifically, theinsert 50 may be pushed into and pulled out from aholder 22 integrated in anexhaust duct 20 which in an undepicted way is welded in position in thehousing 12. The other end of thesleeve 52 is further provided with anoutside thread 54 for engagement with aninside thread 24 of theholder 22 so that theinsert 50 can be firmly connected in theduct 20. An axialouter flange 56 at the outer edge of thesleeve 52 may further have a number ofrecesses 58 evenly distributed round the circumference to engage with an undepicted tool for pulling out and releasing theinsert 50 in theholder 22 of theduct 20. - As most clearly illustrated in
FIG. 2 , there is anannular seal 80 between the inner end of thesleeve 52 and theholder 22. Theannular seal 80 comprises a pair of sealing means in the form ofsealing rings FIG. 4 , thesealing rings sleeve 52 and theholder 22 and be connected in the recesses bysuitable joints 86, e.g. welded or soldered joints or possibly some other tight form of joint such as binding agent capable of withstanding the high temperatures from the exhaust gases flowing past. Theseal 80 is self-centering due to the fact that one, 84′, of thesealing surfaces 82′, 84′ of therings seal 80 works in principle like a seat valve when thesleeve 52 of theinsert 50 is screwed firmly into theholder 22 of theduct 20. Therings sealing ring 82 of the sleeve 52 (not depicted). The cooperatingsealing surfaces 82′, 84′ are with advantage also machined, e.g. turned and where appropriate ground, to high surface fineness in order further to improve the sealing performance. - Reverting to
FIG. 1 , it also depicts anopenable cover arrangement 30 for acircular access aperture 16 in asheetmetal wall 14 of the silencer/post-treatment unit 10. As illustrated in more detail inFIG. 5 , thearrangement 30 comprises acover 32 with acover tightener 40. Thecover 32, like a lid for paint cans, is made of a piece of sheetmetal, e.g. sheet steel, with acovering cover disc 34 which has a curvature v, and a suitably slightly conicalelastic sealing flange 38 intended to sealingly engage with an edge of theaperture 16 when thecover 30 is pressed into theaperture 16. In the example inFIG. 5 , the edge of theaperture 16 is delineated by aninner flange 18 which may likewise, but need not necessarily, be slightly conical. The edge of theaperture 16 need not necessarily consist of aflange 18 but may possibly also be a circular inner edge with a possibly rounded cross-section (not depicted). - The
cover tightener 40 can clamp thecover 32 in a fitted state as depicted inFIG. 6 . In this example thelock tightener 40 has a supporting frame comprising a pair of mutually crossing supporting members or supportingarms 42 with diametrically oppositeangled ends 44 which are firmly connected, e.g. welded or soldered, to the inside of the sealingflange 38. A clamping means in the form of aclamping screw 46 with alocknut 48 is threadedly connected to the supportingarms 42 in their crossing region. The free end of thescrew 46 engages with thecurved cover disc 34 so that when thescrew 46 is tightened its free end presses against the central region of thecover disc 34 and reduces the curvature. When thearrangement 30 is placed in theaperture 16 of thepost-treatment unit 10, approximately as depicted inFIG. 6 , thesealing flange 38 will then be moved in the direction of the arrow from the position represented by chain-dotted lines to the position represented by continuous lines, so that it is further clamped sealingly against the edge/flange 18 of theaperture 16. As further depicted inFIG. 6 , each supportingarm 42 may if necessary have, for example, a curved cross-section to prevent outward deflection of the supportingarm 42 when theclamping screw 46 is tightened. - Many variations of cover and cover tightener are possible. As depicted in
FIG. 7 , thecover tightener 40 may for example take the form of a supporting disc made of a piece of sheetmetal with recesses which delineate a suitable number of radial supporting arms orspokes 42.FIG. 8 depicts schematically acover tightener 40 with a clamping means 90 comprising aneccentric element 92 supported pivotably in an aperture in the supportingframe 42 and manoeuvrable by means of ahandle 94 to alter the curvature of thecover disc 34 between the respective states represented by chain-dotted and continuous lines. - It is also conceivable for the cover disc to curve in the opposite direction (i.e. inwards into the aperture) from that depicted in the drawing and for the clamping device then to exert tensile force instead of pressure on the cover disc (not depicted).
- The description set out above is primarily intended to facilitate comprehension and no unnecessary limitations of the invention are to be inferred therefrom. The modifications which will be obvious to one skilled in the art from perusing the description may be effected without departing from the inventive concept or the scope of the claims set out below.
Claims (13)
1. An insert (50) for a holder (22) in a post-treatment unit (10) for exhaust gases of a combustion engine, comprising
a socket (52) for a treatment component (70) intended to have flowing through it the exhaust gases which are to be treated,
connecting means (54) for holding the insert (50) in position in the holder (22), and
sealing means (82) for gastight closure of the socket (52) relative to the holder (22),
characterised
in that said sealing means (80) comprise a sealing ring (82) on the socket (52) for cooperation in self-centering seat engagement with an opposite sealing ring (84) in the holder.
2. An insert according to claim 1 , in which the sealing ring (82) is arranged for conical seat engagement with the opposite sealing ring (84).
3. An insert according to claim 1 or 2 , in which the sealing ring (82) is made of metal, particularly steel.
4. An insert according to any one of the foregoing claims, in which the sealing ring (82) is machined to such high surface fineness that said closure becomes tight enough to meet prevailing emission requirements.
5. An insert according to any one of the foregoing claims, in which the sealing ring (82) is located in a corner recess of the socket (52).
6. An insert according to any one of the foregoing claims, in which said connecting means comprise a threaded connection (24, 54).
7. An inset according to claim 6 , in which said connecting means comprise an outside thread (54) on the socket (52) for engagement with an inside thread (24) on the holder (22).
8. An insert according to any one of the foregoing claims, in which an outer end of the socket (52) has a recess (58) situated at a circumference for a tool for fastening and releasing the connection (54, 24).
9. A holder (22) for an insert (50) according to any one of the foregoing claims for a post-treatment unit (10) for exhaust gases and provided with said opposite sealing ring (84).
10. A holder according to claim 9 , in which the opposite sealing ring (84) is made of metal, particularly steel.
11. A holder according to claim 9 or 10 , in which the opposite sealing ring (84) is machined to such high surface fineness that said closure becomes tight enough to meet prevailing emission requirements.
12. A holder according to any one of claims 9 -11, in which the opposite sealing ring (84) is located in a corner recess of the holder (22).
13. A post-treatment unit (10) for exhaust gases provided with an insert (50) and/or holder (22) according to any one of the foregoing claims.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1051281A SE535473C2 (en) | 2010-12-03 | 2010-12-03 | Insert, holder and exhaust after-treatment unit |
SE1051281-2 | 2010-12-03 | ||
PCT/SE2011/051416 WO2012074459A1 (en) | 2010-12-03 | 2011-11-24 | Insert, holder and post-treatment unit for exhaust gases |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130283765A1 true US20130283765A1 (en) | 2013-10-31 |
Family
ID=46172158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/990,068 Abandoned US20130283765A1 (en) | 2010-12-03 | 2011-11-24 | Insert, holder and post-treatment unit for exhaust gases |
Country Status (9)
Country | Link |
---|---|
US (1) | US20130283765A1 (en) |
EP (1) | EP2646666B1 (en) |
JP (1) | JP5699224B2 (en) |
KR (1) | KR101831832B1 (en) |
CN (1) | CN103270268A (en) |
BR (1) | BR112013012581A2 (en) |
RU (1) | RU2544675C2 (en) |
SE (1) | SE535473C2 (en) |
WO (1) | WO2012074459A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220186644A1 (en) * | 2019-04-23 | 2022-06-16 | Scania Cv Ab | An emissions control device comprising a threaded disassembling element |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015209681B4 (en) * | 2015-05-27 | 2023-05-17 | Purem GmbH | Exhaust gas treatment device with exchangeable insert |
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-
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- 2011-11-24 EP EP11844469.4A patent/EP2646666B1/en not_active Not-in-force
- 2011-11-24 US US13/990,068 patent/US20130283765A1/en not_active Abandoned
- 2011-11-24 KR KR1020137017218A patent/KR101831832B1/en active IP Right Grant
- 2011-11-24 BR BR112013012581A patent/BR112013012581A2/en not_active Application Discontinuation
- 2011-11-24 RU RU2013130249/06A patent/RU2544675C2/en not_active IP Right Cessation
- 2011-11-24 CN CN2011800575412A patent/CN103270268A/en active Pending
- 2011-11-24 JP JP2013541957A patent/JP5699224B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
RU2013130249A (en) | 2015-01-10 |
WO2012074459A1 (en) | 2012-06-07 |
EP2646666B1 (en) | 2019-01-09 |
KR101831832B1 (en) | 2018-02-23 |
EP2646666A4 (en) | 2014-05-21 |
KR20130124340A (en) | 2013-11-13 |
RU2544675C2 (en) | 2015-03-20 |
CN103270268A (en) | 2013-08-28 |
EP2646666A1 (en) | 2013-10-09 |
JP5699224B2 (en) | 2015-04-08 |
SE535473C2 (en) | 2012-08-21 |
BR112013012581A2 (en) | 2018-05-08 |
SE1051281A1 (en) | 2012-06-04 |
JP2013544340A (en) | 2013-12-12 |
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AS | Assignment |
Owner name: SCANIA CV AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BUCKSCH, RAGNAR;QVIST, GORAN;REEL/FRAME:030691/0729 Effective date: 20130513 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |