Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
• • 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
  • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
  • F01N3/2807—Metal other than sintered metal
  • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
  • B23K1/0014—Brazing of honeycomb sandwich structures
• • 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
  • F01N2330/00—Structure of catalyst support or particle filter
  • F01N2330/30—Honeycomb supports characterised by their structural details
  • F01N2330/44—Honeycomb supports characterised by their structural details made of stacks of sheets, plates or foils that are folded in S-form

Definitions

• the invention relates to a honeycomb body, in particular for a device for the catalytic conversion of exhaust gases in an exhaust system, in particular for an exhaust system of an internal combustion engine, preferably for Otto engines.
• the honeycomb body has a honeycomb body which is arranged in a jacket tube and through which an exhaust gas can flow, the flow channels of which are formed between adjacent layers of wound or layered, at least partially structured sheets.
• the honeycomb body is soldered to the jacket tube only over part of its axial length.
• Such a honeycomb body is known from DE 29 24 592 AI.
• DE 29 24 592 proposes, inter alia, to immerse the honeycomb body arranged in a jacket tube in an immersion bath for a binder with the end faces of the honeycomb body, which results in wetted zones.
• the solder coating takes place in that the solder is applied to the end-side wetting surface from a solder powder store via a sieve.
• the honeycomb body coated in this way is soldered to the jacket tube in a vacuum or under protective gas.
• a method for soldering carrier bodies of exhaust gas catalysts is known from WO 93/12904.
• a solder material is applied to the sheets of the honeycomb body by first dispersing a solder powder of a suitable grain size in a liquid mixture of binding material and liquid and then flooding the flow channels of the honeycomb body. After the flooding, the excess mixture is removed from the flow channels.
• the support used achieves a carrier body in which the outer region of the honeycomb body is soldered to the tubular casing. This creates a rigid connection between the honeycomb body and the casing tube.
• a further method for soldering a honeycomb body is known from WO 93/25339, in which solder material is introduced into a honeycomb body from the end faces.
• soldering processes in particular those in which solder is applied from the end faces, mean that the sheets of the honeycomb body are not only soldered to one another, but also that connections are formed between the honeycomb body and the casing tube.
• honeycomb structures composed of a plurality of sheet metal layers which run approximately in a spiral or involute manner pern on, but also with spirally wound honeycomb bodies with a corrugated outer layer.
• the targeted connection of the honeycomb body to the casing tube in only a certain axial partial area cannot be easily achieved.
• honeycomb body and the jacket tube have a different thermal expansion behavior, a continuous rigid connection between the honeycomb body and the jacket tube is undesirable, since this can cause thermal stresses in the honeycomb body, which can damage the honeycomb body.
• the invention is based on the object of developing the known device for catalytic conversion of exhaust gases in such a way that soldering of the honeycomb body to the jacket tube is avoided in certain axial areas independently of the soldering technique.
• the honeycomb body according to the invention which is preferably suitable for a device for the catalytic conversion of exhaust gases in an exhaust gas system, is characterized in that at least one sheet of the honeycomb body extends and extends from at least one end face over part of the axial length of the honeycomb body Has honeycomb body at least partially surrounding smooth portion.
• the smooth section forms an outer layer on the circumference of the honeycomb body, which lies against the casing tube.
• no solder or only a small proportion of the solder
• the solder can be applied as is known from the prior art.
• the connection of the honeycomb body to the jacket tube takes place over part of the axial length of the jacket tube, the smooth section extending in the axial direction of the honeycomb body only up to the connection area between the honeycomb body and the jacket tube.
• thermal extensibility is achieved in the axial direction of the honeycomb body, since the honeycomb body with the jacket tube now only takes place within one or more connection areas. Over the rest of the honeycomb body and the casing tube there is no undesired soldering of the honeycomb body to the casing tube.
• the smooth section can be part of a smooth sheet which is part of the honeycomb body.
• An embodiment is preferred in which at least one sheet of a honeycomb body extends a first and a second from the end faces of the honeycomb body over a part of the axial length of the honeycomb body at most as far as a connection area between the honeycomb body and the casing tube Honeycomb body surrounding smooth portion.
• This measure allows solder to be applied from one or both end faces of the honeycomb body without the outer layer of the honeycomb body being connected to the tubular casing.
• Another advantage of this embodiment is that when manufacturing such a honeycomb body, even when soldering only one end face, it is not necessary to pay attention to the end face from which it is inserted into a honeycomb body. must be brought. This simplifies the handling and the manufacture of such a honeycomb body.
• the honeycomb body comprises a stack of at least partially structured metal sheets, the ends of the stack being intertwined in opposite directions about at least two fixed points, it is proposed to provide two metal sheets which extend at least one from at least one end face over part of the axial length of the honeycomb body have the smooth portion surrounding the honeycomb body.
• the sheets can each form the top or bottom layer of the stack. It is also possible to arrange such sheets within the stack.
• An embodiment is preferred in which the smooth section or sections are formed on a sheet metal which is arranged in the vicinity of the center of the stack. This has the advantage that the desired success is achieved with an S-shaped honeycomb body with a single sheet.
• the smooth sections preferably partially overlap in the circumferential direction. This ensures that the outer layer of the honeycomb body formed by the smooth section is complete, so that a solder cannot get between the smooth section and the jacket tube.
• FIG. 1 schematically shows a honeycomb body with jacket tube in longitudinal section
• Fig. 6 shows a first embodiment of a smooth section
• Fig. 7 shows a second embodiment of a smooth section.
• the device schematically shows a device for the catalytic conversion of exhaust gases in an exhaust system, in particular for an exhaust system of an internal combustion engine, preferably for Otto engines.
• the device comprises a honeycomb body 2 arranged in a jacket tube 1 and through which an exhaust gas can flow, the flow channels 3 of which are formed between adjacent layers of smooth sheets 4 and structured, preferably corrugated sheets 5.
• the honeycomb body 2 is connected to the casing tube 1 over part of its axial length L. In Fig. 1, the connection area between the honeycomb body 2 and the jacket tube is designated 12.
• the honeycomb body 2 has on a sheet metal 5 a first 9 and a second 10 smooth section, each of which surrounds the honeycomb body 2 in the circumferential direction.
• the first 9 and the second 10 sections each extend from an end face 6 and 11 in the longitudinal direction of the honeycomb body. They extend at most up to a connection area 12 between the honeycomb body 2 and the casing tube 1.
• 2 shows a second embodiment of a honeycomb body. 2 to 5 has been omitted for the sake of clarity.
• the honeycomb body 2 comprises a stack 13 of smooth sheets 4 and corrugated sheets 5. The ends of the stack 13 are each intertwined in opposite directions around the fixed points 14, 15.
• Two sheets 16, 17 are arranged in the honeycomb body, each having a smooth section 8 and 9, respectively.
• the smooth sheets 16, 17 form the outer layers of the stack 13.
• the smooth sections 8, 9 extend to the respectively adjoining section 9 or 8 of the sheet 16 or 17.
• This honeycomb body also comprises a stack 13 of sheets 4, 5 which form the flow channels 3 in the honeycomb body 2.
• the stack 13 is entwined around the fixed points 14, 15.
• a sheet 18 is arranged, which has a section 10 which is dimensioned such that the smooth section 10 extends over the entire circumference of the honeycomb body.
• the smooth sections 10, 20 completely surround the honeycomb body 2 over the circumference.
• FIG. 5 shows an enlarged view of how the smooth section 10 according to FIG. 3 lies against the sheets 4, 5 of the sheet stack 13. 6 and 7 sections 8, 9 formed on a sheet metal are shown. In the embodiment shown in FIG. 6, a recess 21 is formed between the sections 8, 9, which releases the connection region 12 of the honeycomb body 2 with the casing tube 1. Further smooth sections can also be provided, which are formed at a distance from one another with the interposition of cutouts. The geometry of the smooth sections can be adapted according to the shape of the connection area.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Exhaust Gas After Treatment (AREA)
• Catalysts (AREA)
• Exhaust Silencers (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=7755451

Family Applications (1)

Country Status (12)

Cited By (4)

Families Citing this family (6)

Citations (4)

Family Cites Families (8)

• 1995
  • 1995-03-02 DE DE19507299A patent/DE19507299A1/de not_active Withdrawn
  • 1995-12-22 TW TW084113776A patent/TW347435B/zh active
• 1996
  • 1996-02-06 IN IN214CA1996 patent/IN189411B/en unknown
  • 1996-02-09 EP EP96904755A patent/EP0812246B1/de not_active Expired - Lifetime
  • 1996-02-09 CN CN96192315A patent/CN1055873C/zh not_active Expired - Fee Related
  • 1996-02-09 WO PCT/EP1996/000562 patent/WO1996026805A1/de not_active Application Discontinuation
  • 1996-02-09 AU AU48750/96A patent/AU4875096A/en not_active Abandoned
  • 1996-02-09 RU RU97116584A patent/RU2149084C1/ru active
  • 1996-02-09 DE DE59603351T patent/DE59603351D1/de not_active Expired - Fee Related
  • 1996-02-09 ES ES96904755T patent/ES2138808T3/es not_active Expired - Lifetime
  • 1996-02-09 KR KR1019970705942A patent/KR19980702539A/ko not_active Ceased
  • 1996-02-09 JP JP52598396A patent/JP4097693B2/ja not_active Expired - Fee Related
• 1997
  • 1997-09-02 US US08/921,817 patent/US6458329B1/en not_active Expired - Fee Related

Patent Citations (4)

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