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
• • 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
  • F01N2450/02—Fitting monolithic blocks into the housing
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49345—Catalytic device making
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49908—Joining by deforming
  • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
  • Y10T29/49913—Securing cup or tube between axially extending concentric annuli by constricting outer annulus
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49908—Joining by deforming
  • Y10T29/49925—Inward deformation of aperture or hollow body wall
  • Y10T29/49927—Hollow body is axially joined cup or tube
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49908—Joining by deforming
  • Y10T29/49925—Inward deformation of aperture or hollow body wall
  • Y10T29/49927—Hollow body is axially joined cup or tube
  • Y10T29/49929—Joined to rod

Definitions

• the invention relates to a method and a device for producing a catalyst with a monolith having a polygonal cross section.
• Polygon is to be understood here as the shape of a polygon, the corners of which are rounded.
• Exhaust gas catalysts for motor vehicles consist of a central, rod-shaped, ceramic honeycomb body, called a monolith, which is traversed by many fine channels in the longitudinal direction.
• the monolith is surrounded by a casing sheet, in particular made of stainless steel, with the interposition of a so-called expandable mat made of mineral fiber material.
• the cladding sheet must sit very closely over its entire circumference, so that the shock-sensitive material of the monolith is not damaged, in particular during operation of the motor vehicle, no annoying rattling noises occur and the seal between the monolith and the cladding sheet is ensured. It must also be taken into account here that the jacket sheet is cold in the idle state, but very hot in the operating state. As a result, the casing sheet is subject to a certain expansion or shrinkage in the peripheral area.
• the invention solves this problem with a generic catalytic converter in that the jacket sheet consists of a single sheet metal part, that the jacket sheet is bent into its intended final shape by a bending and / or tensioning device in such a way that its edge regions which run at least essentially in the longitudinal direction of the monolith overlap or at least touch and that the edge areas are then permanently connected to each other.
• the invention enables the catalyst to be designed with a cross section that differs significantly from the ideal circular shape. Polygons with a large radius are particularly suitable, since the monoliths can also be easily produced in this form. There is only one longitudinal seam for connecting the jacket sheet, which can be produced very economically from boards separated from coil material. If an overlap of the edge regions to be connected is provided, larger dimensional tolerances of the monolith or the board can also be compensated for without any additional effort in the overlap region. The edge areas of the cladding sheet can then have more or less coverage in the overlap area, e.g. under protective gas. If, on the other hand, the edge areas lie precisely butt-to-butt, additional welding material can be applied to the joint to create the connection.
• the jacket sheet is at least almost preformed into its final shape before its edge regions are brought into their connecting position and connected to one another.
• This preforming of the cladding sheet can be carried out in an upstream, separate bending device. Then the preformed cladding sheet is clamped together with the inflatable mat and the polygonal monolith in a tensioning device so that the cladding sheet now has its intended final shape and the edge areas are in the connection position, whereupon the edge areas are finally joined together.
• the jacket sheet is pre-bent in the bending device into a polygonal shape that is at least almost closed on the circumference.
• a device for performing the method according to the invention provides that a tensioning device surrounds the casing sheet and comprises at least two profile pieces over its circumference, which are connected to one another via at least one flexible tension member and can be moved relative to one another via a power-operated device such that the circumference of the tensioning device and so that the jacket sheet is reduced, but there remains free access to the edge areas to be connected between the profile pieces.
• a pressure piece is provided there, which is pressed onto the jacket plate by the flexible tension member.
• the flexible tension member on the relevant peripheral area itself can already contain the pressure piece acting on the jacket plate.
• the flexible tension member can be of any design. It can be z. B. a rope, a chain or the like. If it is designed as a chain, made of balls, rollers or eyelets, then the pressure piece can be used as a reinforced chain link, e.g. be shaped as a thicker ball or roller. Otherwise, the flexible tension member can also be guided over or through the arbitrarily shaped pressure piece with the aid of an appropriate design, while maintaining its shape. If the pressure piece has a bulge toward the jacket sheet, then a basically polygonal, but also a local, at least slightly concave design of the jacket sheet can be ensured by means of gapless radial tension.
• the force-actuated device acting on the tension member can comprise tension rods which are acted upon approximately tangentially to the casing sheet and alternately in the opposite direction.
• the device may include power operated toggle levers.
• the power-operated device can be operated and controlled mechanically, pneumatically or hydraulically.
• the bending and / or tensioning device can have at least one support for the tension member and / or for a pressure piece on the side opposite the edge regions, and thus the weld seam. Then the shape of the support can be adapted to the shape of the tension member and / or the pressure piece.
• the profile pieces and / or the pressure pieces can be adapted in cross section to the final shape of the casing sheet.
• the device according to the invention ensures defined holding forces of the monolith to the cladding sheet with the most varied polygonal, rounded cross sections. It thus permits a process-reliable manufacture of the catalytic converter with a cross-section that also differs considerably from the circular shape, which in extreme cases may even have slightly concavely curved peripheral regions. This achieves a high degree of adaptability to the available space: due to the very flexible cross-sectional design, the specified space can be used to the maximum and thus optimally, which is particularly advantageous in automotive engineering
• FIG. 1 shows the side view of a preassembled, cross-sectionally trioval catalyst with a pre-formed and tensioned jacket plate that is ready for welding.
• FIG. 2 shows the top view of the tensioning device according to FIG. 1.
• the catalyst 1 initially consists of the central, rod-shaped ceramic honeycomb body which is trioval in cross section and is called monolith 2.
• the monolith 2 is surrounded by a so-called expandable mat 3 made of mineral fiber material and a jacket sheet 4 under prestress.
• the jacket sheet consists of a Chromium-nickel steel is cut from Cilmate ⁇ al into a board and was preformed in an almost closed form in a bending device, not shown
• the preformed cladding sheet 4 is mirror-inverted in cross section and comprises sections 5 to 1 1 bent to different extents.
• the cladding sheet 4 further comprises two overlapping edge regions 12 and 13 which run in the longitudinal direction of the monolith 2 and are inseparably connected to one another.
• the tensioning device 14 comprises two profile pieces 15 and 16 which are connected to one another via a flexible tension member designed as a roller chain 17.
• the profile pieces 15 and 16 and the roller chain 17 almost completely wrap around the casing sheet 4, leaving only one space 18 between the profile pieces 15 and 16.
• the edge regions 12 and 13 lie one above the other, so that a weld seam can be produced with a welding torch 19 under protective gas.
• the profile piece 15 comprises and prints on the section 5 of the jacket plate 4.
• the roller chain 17 is articulated to the profile piece 15 and consists of a first chain section 20 which prints on the section 7.
• the chain section 20 is articulated to a pressure piece 21 which prints on the section 9.
• a second chain section 22, which prints on the section 11, is articulated to the pressure piece 21.
• a second pressure piece 23, which prints on the section 10, is articulated on the chain section 11.
• a third chain section 24 is articulated to the second pressure piece 23 and prints on the section 8.
• the third chain section 24 is finally articulated to the profile piece 16, which prints on the section 6.
• jacket plate 4 is radially loaded over all sections 5 to 1 1 of its circumference and is thus pressed together with the foam mat 3 against the monolith 2.
• the pressing takes place uniformly, since the flexible chain sections 20, 22 and 24 adapt evenly to the relatively strongly curved sections 7, 11 and 8 of the jacket plate 4. Furthermore, the profile pieces 15 and 16 are to the bend of the relatively weakly curved sections 5 and 6 , the pressure pieces 21 and 23 to the Bending of the also relatively weakly curved sections 9 and 10 adapted to the desired final shape of these sections.
• a support 25 is provided, on which the chain section 22 can be supported, the support 25 with its support surface 26 being adapted to the bending of the chain section 22 and thus indirectly to the bending of section 11.
• the tensioning device 14 further comprises a power-operated device in the form of tie rods 27 and 28.
• the tie rods 27 and 28 are articulated alternately on the profile pieces 15 and 16, see also FIG. 2, and are acted upon by forces F approximately tangentially to the jacket plate 4. These forces F secure the position of all components involved until the weld seam at the edge regions 12 and 13 is completed.
• the tie rods 27 and 28 can also be operated via toggle levers.
• the required forces can be generated mechanically, pneumatically or hydraulically.
• the invention has been described by way of example using a so-called trioval cross section.
• the method according to the invention can be applied to a large number of rounded, polygonal cross sections by expert adaptation of the device.

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)
• Catalysts (AREA)
• Exhaust Gas Treatment By Means Of Catalyst (AREA)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

Country Status (6)

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Family Cites Families (13)

• 2000
  • 2000-04-15 DE DE10018805A patent/DE10018805A1/de not_active Withdrawn
• 2001
  • 2001-04-10 DE DE50114969T patent/DE50114969D1/de not_active Expired - Lifetime
  • 2001-04-10 WO PCT/EP2001/004064 patent/WO2001079668A1/fr active Application Filing
  • 2001-04-10 EP EP01940310A patent/EP1274924B1/fr not_active Expired - Lifetime
  • 2001-04-10 US US10/257,693 patent/US6912784B2/en not_active Expired - Fee Related
  • 2001-04-10 AU AU2001273931A patent/AU2001273931A1/en not_active Abandoned
  • 2001-04-10 AT AT01940310T patent/ATE435966T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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