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
  • F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
• • 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
  • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
  • F01N2450/02—Fitting monolithic blocks into the housing

Definitions

• Method and device for producing a honeycomb body in particular a catalyst carrier body, with a housing
• the invention relates to a method and a device for producing a honeycomb body, in particular for cleaning exhaust gases from internal combustion engines, with a catalyst carrier body arranged in a jacket tube or housing and having a plurality of channels through which an exhaust gas can flow.
• Devices for exhaust gas purification which have a metallic catalyst carrier body.
• the metallic catalyst carrier body is produced by winding or devouring sheet metal layers, at least some of the sheet metal layers being structured.
• Such catalyst carrier bodies are described, for example, in EP 0 245 738.
• the catalyst carrier body are arranged in a jacket tube or housing.
• the individual sheet layers are with each other and with the jacket tube z. B. connected by soldering, sintering or welding.
• the device is integrated in an exhaust system. Since the two ends of the device each have to be connected to a pipe of the exhaust system, the device is connected to a diffuser on the exhaust gas inlet side and to a reducer on the exhaust gas outlet side.
• the task of the diffuser is the flow cross-section for the exhaust gas from the cross section of the pipe to the cross section of the device and the reducer to reduce the flow cross section on the outlet side of the device to the cross section of the adjoining pipe.
• the diffuser and the reducer are connected to the device by welding. For this it is necessary that the dimensions of the tube on the gas inlet and gas outlet side and the contour of the jacket tube are within certain tolerance limits.
• the jacket tube usually protrudes about 5 to 10 mm on both ends of the catalyst carrier body.
• the jacket tube is calibrated from the inside before and / or after the catalyst support body has been inserted.
• the calibration has hitherto generally been carried out in such a way that a tool which has a plurality of segments is inserted into the casing tube and the individual segments are spread radially outwards. The segments are spread beyond the yield point of the jacket pipe material, so that the jacket pipe is stress-free in this area. Since the segments of the tool are spread radially outwards, a precisely predetermined contour cannot be achieved.
• a device for producing a honeycomb body with a jacket tube is known from US Pat. No. 5,096,111, which comprises several radially displaceable segments, through which the jacket tube of the honeycomb body is deformable.
• the individual segments are connected at one end to a carrier which is connected to a piston rod of a cylinder-piston unit.
• the carrier with the segments is axially displaceable in and out of a cylindrical body.
• the cylinder-piston unit is connected to the cylindrical body.
• a conical formed section which tapers in the axial direction from the inlet side.
• a plurality of segments encompass the jacket tube of the honeycomb body. Then the honeycomb body is drawn into the cylindrical body by means of the cylinder-piston unit. When the honeycomb body is pulled in, it is successively deformed in the conical section. After the deformation has taken place, the honeycomb body with the segments is brought out of the cylindrical body by the cylinder-piston unit. During the axial displacement of the segments, they slide along the inner surface of the cylindrical body.
• the catalyst carrier body consists of a ceramic material.
• Such catalyst carrier bodies are arranged in a two-part housing.
• the G 87 01 980.9 UI describes such a housing for accommodating a monolithic ceramic body.
• the half shells of the housing are made from sheet metal by deep drawing.
• a casing for the ceramic body is provided between the outside of the carrier body and the housing.
• the housing parts can be manufactured with high accuracy.
• the ceramic catalyst carrier bodies cannot be produced precisely enough. It is therefore necessary to dimension the housing in such a way that ceramic catalyst carrier bodies with oversize or slight deformations can also be integrated into the housing.
• an intermediate layer in particular a so-called swelling mat, is inserted.
• Other intermediate layers with wire mesh and. ⁇ . are known. These layers can also be coated with a catalyst.
• the aim of the present invention is to provide a device for producing a honeycomb body which is structurally simple and which rationally brings about a uniform and gentle deformation of the jacket tube.
• Another object of the present invention is to provide a method for producing a honeycomb body, which simplifies the manufacture of a honeycomb body and allows higher cycle times in the manufacture of the honeycomb body.
• the device according to the invention for producing a honeycomb body with a jacket tube is characterized in that the segments each have a sliding surface which is wedge-shaped in cross section.
• the segments are surrounded by an axially displaceable, ring-shaped closing element which has at least one inclined surface.
• the inclined surface of the closing element slides on the wedge-shaped sliding surface of each segment, as a result of which the axial displacement of the ring brings about a radial displacement of the segments relative to the tubular casing.
• the simultaneous radial movement of the segments has the result that all segments exert a force synchronously on the jacket tube, by means of which the jacket tube is plastically deformed.
• An actuating device is provided for the axial displacement of the closing element and is connected to the closing element. The force transmitted from the closing element to the segments can be adjusted accordingly by the angle of the inclined surfaces.
• the inclination of the sliding surface of each segment and the inclined surface of the closing element acting on the sliding surface need not be the same for each segment.
• the inclination surfaces can be designed differently, as a result of which different forces can act on the jacket tube when viewed in the circumferential direction.
• a uniform load on the honeycomb body can be achieved. This is of particular interest in the case of honeycomb bodies made of ceramic materials or in the case of extruded metallic honeycomb bodies, since this enables a uniform pressure load to be set without tensile or gravitational forces occurring which would destroy the body.
• the segments can immediately deform the jacket tube.
• the segments also represent tool segments.
• the inclined surface of the closing element is preferably only partially in contact with the sliding surface, so that the two surfaces form a free angle with one another. This angle is preferably 0.5 to 3 °. This ensures that the locking element does not become jammed with the segments.
• the segments are advantageously arranged to be radially displaceable inward against a spring force. This has the advantage that after a plastic deformation of the casing tube and an axial displacement of the closing element into a position in which the sliding surface and the inclined surface are no longer in contact, the segments automatically move radially outward, as a result of which they release the honeycomb body.
• At least one spring element is preferably provided, which is connected to each segment.
• the spring element is advantageously a spring ring which is arranged in a groove formed on the surface of each sector opposite the sliding surface.
• the spring element is then loaded under pressure. If the segments are to be tool parts that directly deform the casing tube, it is expedient to cover the grooves or to arrange the spring element on the outer surface of the segments, so that there are no discontinuities in the surface of the segment due to the axial extension of the segments System comes to the jacket pipe occur.
• an actuating device which comprises at least two, preferably four, rods, a plate and a cylinder-piston unit.
• the piston rod of the cylinder-piston unit is connected to the plate.
• One end of each rod is connected to the plate and the other end of each rod is connected to the closing element.
• the cylinder-piston unit transmits the axial movement via the plate and the rods to the closing element.
• the plate is expediently guided in a sliding manner, thereby preventing the closing element from possibly being misaligned.
• the segments are preferably arranged on a base plate.
• a base plate is provided below the base plate.
• Carriers are arranged between the base plate and the base plate, the base plate and the base plate and the carriers forming a frame of the device.
• the cylinder-piston unit is arranged on the base plate.
• the rods engaging the closing element extend through bores formed in the base plate. These through bores can simultaneously serve as guides for the rods.
• the carriers optionally form guides for the plate, as a result of which the carriers have a dual function and additional guides for the plate can be dispensed with.
• a bore is provided in the base plate coaxial with the receptacle for the honeycomb body forming the segments, through which a stamp of an ejection device can be inserted and removed into the space delimiting by the segments.
• the ejection device is preferably a pneumatically or hydraulically operated cylinder-piston unit.
• the ejection device can also be a lever which can be pivoted about an axis, the first arm of which is coupled to a rod or the plate and the second arm is connected to the stamp.
• the device with a frame in which an annular chamber is formed.
• a piston is arranged in the annular chamber and is connected to rods which engage the closure element.
• the chamber is filled with a fluid that is supplied via lines a pressure accumulator is supplied, acted upon, whereby the relative position of the piston can be changed.
• the advantage of this training can be seen in the fact that the power flow is particularly favorable.
• the segments are arranged on the frame, so that the frame is loaded by the axial component of the force acting on pressure.
• Another advantage is the integration of the actuating device in the frame, whereby a very compact design is achieved.
• a stop is preferably provided for fixing the axial position of a honeycomb body.
• the stop is preferably designed in the form of lugs which are provided on at least two segments.
• the device is advantageously designed such that a passage opening is provided below the segments, through which a honeycomb body can be removed from the deformation region after plastic deformation has taken place.
• the honeycomb body is plastically deformed only at one end region of the jacket tube, it is necessary for the plastic deformation of the second end region to provide a second device for carrying out the method or to rotate the jacket tube about its transverse axis by 180 °. Both solutions do not always provide a satisfactory result. It is therefore proposed to carry out the plastic deformation by means of segments which act on both end regions of the casing tube.
• the entire casing tube can be plastically deformed by the segments.
• the jacket tube initially has a geometry which, after plastic deformation, leads to the desired geometry of the device. It is not imperative here that the catalyst carrier body is already firmly connected to the jacket tube before the deformation.
• ceramic bodies which are round, elliptical or oval in cross-section (race-track shape) can also be fastened in a casing tube as a housing.
• the honeycomb body can be clamped uniformly on all sides, thereby preventing the ceramic walls from breaking even with high clamping forces.
• the segments can be designed with corresponding elevations or recesses for clamping the casing tube on the catalyst carrier body. If recesses are provided on the segments, these lead to external beads and thus to a higher rigidity of the casing tube, which is particularly advantageous since no or only very small forces act on the body which result from torsion (torsion) of the casing tube .
• the jacket tube can also be compressed in the device in order to produce special shapes.
• the method according to the invention for producing a honeycomb body with a jacket tube is characterized in that the honeycomb body passes through at least one calibration station in which the jacket tube of the honeycomb body is deformed while maintaining its transport direction.
• This configuration of the method gives the possibility of considerably reducing the cycle time. It is no longer necessary, as is known from the prior art, to first introduce the honeycomb body into a calibration station and, after calibration, to convey it back out of the calibration station.
• the continuous processing of the honeycomb body also reduces the apparatus structure required for the production of the honeycomb body, since handling devices are no longer necessary which introduce a honeycomb body into a calibration station and bring it out again.
• a method is preferred in which the honeycomb body passes through several calibration stations in succession.
• only a predetermined axial section of the jacket tube is deformed in the individual calibration stations.
• the passage of the honeycomb body through individual calibration stations, in which only predetermined axial sections of the jacket tube are deformed, have the advantage that the tools with which the deformation is carried out can be designed more simply.
• the deformation of the casing tube can be relatively large.
• the degree of deformation ie the difference between the shape of the jacket tube before and after the deformation in relation to the initial shape of the jacket tube, is the same in the individual calibration stations.
• the individual calibration stations are preferably passed through one after the other by the honeycomb bodies.
• a method is proposed in which the honeycomb body is subjected to at least one further production step at least after a calibration station.
• a manufacturing step is not only to be understood as steps through which the manufacturing progress is continued, but also as steps that begin the manufacturing process as such. increase. It can be exemplary and expedient to provide the outside of the jacket tube between two calibration stations with a lubricant in order to reduce the friction between a closing segment and the jacket tube.
• the honeycomb body is preferably deformed with a jacket tube in a calibration station in which the honeycomb body with the jacket tube is arranged in a space delimited by segments. Thereafter, at least one annular closing element having at least one inclined surface is axially displaced, the surface sliding on a sliding surface which is wedge-shaped in cross-section on each segment and the segments being displaced radially to the casing. The sheath is deformed by the radial displacement of the segments.
• the closing element is displaced axially in the opposite direction, as a result of which the segments release the jacket tube.
• the honeycomb body can then be transported away with the jacket tube.
• the deformation of the casing tube by the closing process does not necessarily have to take place in a single closing process. It is proposed to close and open the segments several times, whereby the casing tube is successively given its predetermined shape.
• the honeycomb body is to be rotationally symmetrical, it is proposed to twist the honeycomb body about its longitudinal axis in such a way that the twist angle is smaller than the arc angle of a segment.
• the segments exert a force on the jacket tube several times. This also results in an even more uniform plastic deformation.
• the honeycomb body passes through several calibration stations, it is advantageous if the honeycomb body opens before at least one a calibration station following calibration station is rotated about its longitudinal axis, the angle of rotation being smaller than the arc angle of a segment.
• the jacket tube of a honeycomb body produced with the device according to the invention maintains its strength properties since the fiber course in the material is not destroyed.
• FIG. 1 shows a first embodiment of a device in cross section
• Fig. 5 shows schematically a section of a transfer line
• Fig. 6 is a diagram.
• the device comprises a base plate 17 and a base plate 18.
• the base and base plates 17 and 18 are arranged at a distance from one another. Between the base plate 17 and the base plate 18 carriers 19 are arranged. The respective end of a carrier 19 is connected to the base plate 17 or the base plate 18.
• the segments 5 are arranged on the base plate 18.
• the segments 5 are essentially radially displaceable.
• a sliding plate 20 is arranged between the segments 5 and the base plate 18, on which the segments 5 slide.
• the slide plate 20 may e.g. B. by a releasable connection, in particular by a screw connection, with the base plate 18.
• the segments 5 can be guided in the slide plate 20 and / or the base plate 18.
• the segments 5 can have corresponding projections which engage in guide grooves. In any case, a relatively large sliding surface between base plate 18 and segments 5 prevents the segments from tilting.
• Each segment 5 has a sliding surface 9 which is wedge-shaped in cross section.
• the segments 5 are surrounded by an annular closing element 7, which has a conical surface 8.
• the sliding surface 9 and the surface 8 slide on each other when the ring is axially displaced in accordance with the arrows V.
• the annular closing element 7 has a circumferential collar 21 which is provided with through bores 22.
• stiffening ribs 23 distributed around the circumference of the annular closing element.
• Screws 24 extend through the through bores 22, each of which is connected to a rod 11, which extends through the base plate 18 essentially parallel to the longitudinal axis 25.
• the opposite end of each rod 11 is connected to a plate 12.
• the connection can be made by screw connections 24, as shown.
• the plate 12 can be guided on the carriers 19.
• the plate 12 has a centrally formed threaded bore 26 into which a threaded pin 27 is screwed.
• the threaded pin 27 forms one end of a piston rod 28 of a cylinder-piston unit 13.
• the cylinder-piston unit 13 is fixedly arranged on the base plate 17.
• FIG. 2 shows a second exemplary embodiment of a device for producing a honeycomb body.
• the same parts of the device have the same reference numerals as in FIG. 1.
• the device has a frame 30.
• an annular chamber 31 is formed, which forms the cylinder of a cylinder-piston unit 14.
• the chamber 31 is closed by means of a closure plate 32.
• the closure plate 32 is screwed to the frame 30 by means of screws 33.
• a sealing ring - O-ring - is arranged between the frame 30 and the closure plate 32.
• a piston 35 is arranged in the chamber 31 and has an annular cross section.
• a radial shaft sealing ring 36, 37 is arranged between the piston 35 and the wall of the chamber 31.
• Rods 11 are connected to the piston 35 and engage one end of the ring 7.
• Each rod 11 is connected to the piston 35 by means of a screw 38.
• Each rod 11 is slidably guided in a sliding bush 39.
• Each slide bush is arranged in a corresponding recess 40 in the frame 30.
• the device has eight segments 5.
• the segments 5 have recesses lying in one plane, in which a spring ring 41 or 42 is arranged.
• a through opening 43 is formed below the segments 5.
• the through opening 43 has a cross section which essentially corresponds to the cross section of the inner contour formed by the segments. After a honeycomb body has been plastically deformed by the segments and the segments release the honeycomb body again, the honeycomb body can leave the device through the opening 43.
• the closing element 7 has a conical surface. This surface 8 slides on the sliding surface 9 of the segment 5. The two surfaces 8 and 9 have different angles of inclination with respect to the longitudinal axis 25.
• the inclination angles are chosen so that an open angle ⁇ is formed between the two surfaces 8 and 9, which lies in a range between 0.5 and 3 °.
• the pressure area within which the force from the closing element is applied to the segments 5 is shown in dashed lines in FIG.
• a section of a transfer line 48 is shown schematically in FIG.
• the transfer line 48 comprises the calibration stations 43, 44, 46 and 47.
• a processing station 45 is arranged between the calibration stations 44 and 46.
• the transport direction of the honeycomb body is identified by T.
• the honeycomb bodies pass through the individual stations, calibration stations and processing stations one after the other.
• a calibration station comprises at least one device such as. B. is shown in Figure 2.
• the individual honeycomb bodies pass through the calibration stations 43, 44, 46 and 47 successively, each honeycomb body passing through the individual calibration stations being deformed while maintaining its transport direction T.
• the honeycomb body can be subjected to further processing, processing being understood in the broadest sense. This can also be a quality control of the honeycomb body.
• FIG. 6 schematically shows a diagram which shows the diameter of a rotationally symmetrical honeycomb body according to individual calibration stations K j to K 4 .
• a significantly greater reduction in the diameter of the casing tube from D j to D 2 takes place in the calibration station K 2 compared to the other calibration stations K j , K 3 or K 4 .
• the representation of Figure 6 is schematic in nature. How large the reduction of the jacket tube should take place within the individual calibration stations also depends on which honeycomb body it is and for what purpose it is to be used. Reference symbol list:

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)

Priority Applications (5)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=6532655

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (3)

Citations (3)

• 1994
  • 1994-11-07 DE DE4439685A patent/DE4439685A1/de not_active Withdrawn
• 1995
  • 1995-09-15 TW TW090202963U patent/TW529474U/zh unknown
  • 1995-10-11 DE DE59502017T patent/DE59502017D1/de not_active Expired - Fee Related
  • 1995-10-11 WO PCT/EP1995/004007 patent/WO1996014500A1/de active IP Right Grant
  • 1995-10-11 CN CN95196074A patent/CN1069948C/zh not_active Expired - Fee Related
  • 1995-10-11 KR KR1019970703028A patent/KR100351339B1/ko not_active IP Right Cessation
  • 1995-10-11 JP JP8514981A patent/JP2950997B2/ja not_active Expired - Fee Related
  • 1995-10-11 EP EP95936472A patent/EP0791132B1/de not_active Expired - Lifetime
  • 1995-10-11 AU AU38410/95A patent/AU3841095A/en not_active Abandoned
  • 1995-10-11 ES ES95936472T patent/ES2116777T3/es not_active Expired - Lifetime
  • 1995-10-31 MY MYPI95003289A patent/MY114904A/en unknown

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events