WO1990003842A1 - Metal carrier having thermal fatigue resistance for automobile exhaust gas cleaning catalysts - Google Patents
Metal carrier having thermal fatigue resistance for automobile exhaust gas cleaning catalysts Download PDFInfo
- Publication number
- WO1990003842A1 WO1990003842A1 PCT/JP1989/001015 JP8901015W WO9003842A1 WO 1990003842 A1 WO1990003842 A1 WO 1990003842A1 JP 8901015 W JP8901015 W JP 8901015W WO 9003842 A1 WO9003842 A1 WO 9003842A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outer peripheral
- reinforcing layer
- honeycomb body
- peripheral reinforcing
- carrier
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 61
- 239000002184 metal Substances 0.000 title claims abstract description 61
- 239000003054 catalyst Substances 0.000 title claims description 14
- 238000004140 cleaning Methods 0.000 title 1
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 78
- 238000004804 winding Methods 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims description 108
- 239000011888 foil Substances 0.000 claims description 89
- 238000005304 joining Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 9
- 238000010030 laminating Methods 0.000 claims description 2
- 238000009751 slip forming Methods 0.000 claims 1
- 230000008646 thermal stress Effects 0.000 abstract description 28
- 241000264877 Hippospongia communis Species 0.000 description 115
- 239000007789 gas Substances 0.000 description 24
- 238000001816 cooling Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 11
- 238000005219 brazing Methods 0.000 description 10
- 229910001220 stainless steel Inorganic materials 0.000 description 10
- 239000010935 stainless steel Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 230000005856 abnormality Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 230000035882 stress Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 208000025599 Heat Stress disease Diseases 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008642 heat stress Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
-
- B01J35/56—
-
- 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
-
- 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
- F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
-
- 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
- F01N2330/32—Honeycomb supports characterised by their structural details characterised by the shape, form or number of corrugations of plates, sheets or foils
- F01N2330/322—Corrugations of trapezoidal form
-
- 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
- F01N2330/32—Honeycomb supports characterised by their structural details characterised by the shape, form or number of corrugations of plates, sheets or foils
- F01N2330/324—Corrugations of rectangular form
-
- 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
- F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
- F01N2350/02—Fitting ceramic monoliths in a metallic housing
- F01N2350/04—Fitting ceramic monoliths in a metallic housing with means compensating thermal expansion
-
- 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
Definitions
- the present invention relates to a metal carrier for carrying a catalyst for purifying N0x, HC, CO, etc. which comes into contact with the exhaust gas, and is particularly installed in an exhaust gas system of an automobile engine.
- a metal carrier that has sufficient strength to withstand the catalyst and sufficient vibration against high-temperature exhaust gas pressure and sufficient thermal fatigue resistance against severe temperature fluctuations. That's what it is.
- the mainstream of exhaust gas purification catalysts has a structure in which ceramic alumina such as coal light is loaded with alumina powder that supports a noble metal catalyst such as Pt on a ceramic honeycomb.
- these ceramic honeycombs have slightly higher exhaust resistance, and the heat resistance of the shock-absorbing stainless steel mesh inserted between the outer cylinder to prevent the honeycomb from being destroyed. Therefore, there were drawbacks such as that the operating temperature was restricted to a lower temperature.
- metal carriers are attracting attention. These metal carriers are generally composed of a honeycomb formed by laminating or winding a flat metal foil (flat foil) and a corrugated metal foil (corrugated foil), and a metal shell for housing the honeycomb. Naturally, heat resistance to withstand high temperature and high speed exhaust gas during the reaction and heat fatigue resistance to withstand intense heating and cooling are required.
- the metal carrier In order for the metal carrier to withstand high-temperature and high-speed exhaust gas, it is effective to use stainless steel foil with good oxidation resistance and increase the mutual bonding area, but this alone can withstand severe heating and cooling. I can't.
- the honeycomb in the case of a metal carrier mounted on a car engine, the honeycomb is heated ahead of the outer cylinder during acceleration from the start of travel, and the engine brake state is maintained during deceleration, and the fuel supply is cut off during this time.
- the honeycomb In this type, the honeycomb is cooled before the outer cylinder, and a large temperature difference occurs between the outer cylinder and the honeycomb, and a temperature distribution also occurs in the honeycomb. In addition, the temperature difference is reversed between acceleration and deceleration.
- the honeycomb and the material of the outer cylinder generally have different coefficients of thermal expansion, a large thermal stress is generated near the outer periphery of the honeycomb. appear. As a result, the honeycomb may break down due to thermal fatigue near the outer cylinder, and the back pressure of the exhaust gas may cause the honeycomb to shift in the leeward direction.
- the bonding between the honeycomb body and the outer cylinder is extremely unstable, and at the same time, it does not exhibit sufficient characteristics at least on the bonding strength of the honeycomb to the outer cylinder and thermal fatigue resistance.
- the joining between the honeycomb body and the metal outer cylinder there is a method of mechanically fixing the honeycomb body as disclosed in Japanese Utility Model Application Laid-Open No. 160728/1987, but the honeycomb body is separated from the outer cylinder. Vibrates inside the outer cylinder, the supported catalyst falls off, and the purification capacity decreases.
- Japanese Utility Model Application Laid-Open No. 62-194436 discloses a metal honeycomb carrier in which the outer peripheral surface of a honeycomb body and the inner surface of an outer cylinder are joined only at one cross section of the outer cylinder.
- only the end of the foil as disclosed in JP-A-62-273050, JP-A-62-273051, etc. is used in the axial direction.
- the flat foil of the honeycomb body is not bonded to the corrugated foil, and the flat foil is deformed at a large cycle as disclosed in JP-A-62-83044.
- the present invention has been made in view of the drawbacks of the prior art, and provides a metal carrier having heat resistance to withstand high temperature and high speed exhaust gas flow and withstand rapid heating and cooling.
- the present invention has developed a carrier structure that is unlikely to undergo destructive destruction due to thermal fatigue even when a temperature distribution is generated between the honeycomb and the outer cylinder, and even within the honeycomb.
- a metal catalyst for an automobile catalyst consisting of a metal honeycomb and a metal outer cylinder enclosing a metal foil and a corrugated metal foil, and at least one axial end of the honeycomb is flat foil and corrugated foil Is joined from the outermost circumference to the innermost circumference (this portion is hereinafter referred to as an end face portion), and at least a part of the intermediate portion connected to the end face portion has at least one full roll of flat foil and corrugated foil from the outermost circumference.
- the outer peripheral corrugated or flat foil on the outermost periphery of the honeycomb and the metal outer cylinder are mainly joined at the intermediate portion. That it is being done At the time.
- the performance required of the metal carrier is as follows: high temperature â Strength at high temperatures to withstand external forces such as high-speed exhaust gas flow and engine vibration, and heat and cooling of exhaust gas This means that it can withstand the thermal stress generated inside the honeycomb body.
- a joint structure that reduces the generated thermal stress should be used, and at the same time, even if thermal fatigue fracture occurs, The goal is to avoid destruction of the carrier.
- Joining The higher the value, the higher the rigidity and strength of the honeycomb body, but the greater the thermal stress generated inside the honeycomb body. For example, as shown in Fig. 18, when the flat foil and the corrugated foil are joined over the entire area inside the honeycomb body, and when the entire outer cylinder is joined, the inside of the honeycomb body and the honeycomb Large thermal stress is generated between the outer cylinders, and the foil near the outer periphery of the honeycomb breaks, causing displacement in a short time.
- the flat foil and corrugated foil are joined over the entire layer from the outermost periphery to the innermost periphery in the vicinity of both end surfaces of the honeycomb, and the outer periphery of the unjoined portion 10 and the end surface portion
- the honeycomb and outer cylinder are joined between W-1 and W-2, which are separated from the inner surfaces 8-1, 9-11 by a predetermined distance.
- the end faces where the thermal stress is the largest are not joined to the outer cylinder, but are joined to the outer cylinder on the outer peripheral side of the unjoined portion 10 where the thermal stress is relatively small. It looks reasonable from the viewpoint of reduction.
- the whole honeycomb is held by one outermost foil between W-1 and 8-l'W-2 and 9-1, and it cannot sustain strength and has a short life. is there.
- thermal stress is generated at the joint between the end face portion and the outer cylinder, which breaks and causes a displacement.
- the generation of thermal stress is caused by expansion and contraction due to heat inside the carrier, and is greatest at the outermost periphery.
- the outer periphery is in tensile stress when the interior contracts. At this time, if only the outer periphery of the honeycomb body is joined and the inside is not joined, even if the inside contracts, no large thermal stress is generated in the outer periphery.
- the present invention has a structure in which the flat foil and the corrugated foil of the honeycomb body are bonded only near the outer periphery of the honeycomb body and not inside.
- a displacement of the flat foil called scoping due to the exhaust gas flow may occur, or a part of the foil may be bent or cut and scattered. Therefore, at least one of the two ends must be joined to the flat foil and the corrugated foil from the outermost periphery to the innermost periphery so as to withstand external force.
- the honeycomb body of the metal carrier is formed by joining the flat foil and the corrugated foil of at least one of the both ends from the outermost periphery to the innermost periphery, and at the other intermediate part only in the vicinity of the outer periphery.
- a joint structure having both end portions and an outer peripheral reinforcing layer was formed.
- the joining range is limited.
- the range is the outermost circumference / '.
- the number of turns is up to one-fourth of the total number of turns. If the number of joints is increased beyond that range, the thermal stress applied to the outermost periphery will increase, and the honeycomb body will be damaged.
- the outer cylinder and the honeycomb body are joined from the outermost periphery to the innermost periphery of the honeycomb body, that is, only the vicinity of the outer periphery of the honeycomb body is joined while avoiding the end face as much as possible.
- the outer cylinder and the honeycomb body are mainly joined at the outermost peripheral portion of the outer peripheral reinforcing layer.
- FIG. 1 is a cross-sectional perspective view of a general metal carrier
- Fig. 2 is an enlarged view of part A of Fig. 1,
- FIG. 3 is a schematic view showing a joining state of a cross section of a metal carrier according to the present invention, in which flat foil and corrugated foil at both ends of a honeycomb are joined (to form an end face), and a part of a middle portion of a honeycomb is formed.
- the flat foil and the corrugated foil are joined (formation of the outer peripheral reinforcement layer), and furthermore, the state where the foil and the corrugated foil are joined is shown.
- FIG. 4 to 5 are views showing another embodiment of FIG. 3, and FIG. 6 shows another joining state of the honeycomb side surface and the metal outer cylinder of FIG.
- FIG. 7 shows another state of the cross section of the metal carrier according to the present invention.
- the flat foil and the corrugated foil at one end of the honeycomb are joined, and the flat foil and the corrugated foil at a part of the middle part of the honeycomb are joined and further joined to the outer cylinder.
- FIGS. 8, 9, 10, and 11 show another embodiment of FIG. 7,
- FIG. 14 shows another embodiment of FIG. 7,
- FIG. 15 shows another embodiment of FIG.
- FIG. 16 is a view showing another joint state of the honeycomb side surface and the metal outer cylinder in another embodiment of FIG. 4,
- FIG. 17 shows another embodiment of FIG.
- FIG. 18, FIG. 19, FIG. 20, and FIG. 21 are views showing a bonding state of a cross section of a metal carrier showing a comparative example to the present invention.
- the metal carrier 1 is generally rolled up in a cylindrical or elliptical column shape by superimposing around 50 stainless steel flat foil 2 and corrugated stainless steel corrugated foil 3 and winding it. And the flat foil-corrugated space 5 and the corrugated foil-outer cylinder 6 are joined to each other by brazing or the like.
- FIG. 3 shows the joining state of the cross section of the metal carrier according to the present invention.
- the honeycomb end faces 7 â 1, 7 â 2 on the entrance and exit sides of the honeycomb are joined from the innermost circumference to the outermost layer of the honeycomb from the innermost to outermost layers in the axial direction to a depth of 2 mm or more and 30 ram or less.
- the side surfaces of the end portions 8 and 9 and the inner surface of the outer cylinder 4 are not joined, but are joined beyond the axial depth of the outer peripheral reinforcing layers 1 and 12. 2 has been done.
- connection between the end face and the outer peripheral reinforcing layer is shallow at the center where axial shear stress is small. It is also desirable to continuously increase the depth toward the outer periphery where the shear stress increases (Figs. 14 and 15). This structure Require special manufacturing equipment.
- a binder liquid for attaching the brazing material is applied to a predetermined portion of the corrugated foil by a special opening while winding the carrier. At this time, it is necessary to wind the carrier while sliding the application roller in the axial direction of the mouth roller, and to change the application width of the binder to the corrugated foil from the inner peripheral portion to the outer peripheral portion. After the flat foil and the corrugated foil are wound in this way, the brazing material is sprinkled, the brazing material is attached to a predetermined position, and then a vacuum heat treatment is performed to obtain an intended bonded structure.
- the outer peripheral reinforcing layer which is joined only from the outermost periphery for at least one turn and not more than 1/4 of the total number of turns may be one extending over the entire intermediate length other than the joining portion of the end face portion and only the portion.
- Their position, number of layers and length should be selected as appropriate depending on the dimensions of the carrier and the welding locations of the upper and lower cones.
- the joining of the honeycomb body and the outer cylinder is usually preferable to avoid this part because the thermal stress in the radial direction is large at the end face, but especially the carrier is mounted close to the engine and the engine vibration is reduced. In the case of receiving in the axial direction, it is necessary to have high bonding strength with the outer cylinder.
- the joining in the present invention is performed by a method such as brazing, resistance welding, laser welding, electron beam welding, or arc welding.
- the wave shape of the corrugated foil may be any of a sine wave, a trapezoid, a rectangle and the like. Furthermore, in the axial direction of the metal carrier of the present invention, the vertical cross-sectional shape may be other than circular, for example, elliptical or lace track.
- FIG. 4 shows a state in which the outer peripheral reinforcing layer 14 is in contact with the inner surfaces 8-1, 9-11 of the both end surfaces 8 and 9, and is formed over the entire length of the intermediate portion.
- Fig. 5 is composed of the combination of Fig. 3 and Fig. 4, and the outer peripheral reinforcing layers 11 and 12 connected to both end faces 8 and 9 are replaced with other outer peripheral reinforcing layers. It is formed in multiple layers from 14.
- FIG. 6 shows another embodiment of FIG. 4, in which the joint 16 between the outermost peripheral surface of the outer peripheral reinforcing layer 14 and the inner surface of the outer cylinder is separated from the inner surfaces 8-1, 9-11 of both end surfaces 8, 9. It is configured with W as the starting point.
- the interval d may be appropriately selected depending on the material, structure, size, and the like used for the substrate, particularly in consideration of the amount of contraction in the honeycomb body radial direction.
- FIG. 5 shows that the formation of the axial end face of the honeycomb body is limited to 8 on one side. That is, the outer peripheral reinforcing layer 14 has its upper end in contact with the inner surface 8-1 of the end face portion 8, and has its lower end reaching the end face 7 of the honeycomb body.
- the joint 16 between the outer peripheral reinforcing layer 14 and the outer cylinder 4 in this embodiment is made on the opposite side of the end face 8 so as to be as far as possible from the end 8. If the end face is formed on only one side as in this embodiment, there is no symmetry as in the case of forming both end faces, but the honeycomb body is formed. It has high flexibility and can flexibly cope with the heat cycle of heating and cooling, and can have a more flexible structure by increasing the distance d as described above.
- FIG. 8 shows an outer peripheral reinforcing layer 11 connected to one end face portion 8 having a predetermined length along the axis of the honeycomb body.
- a joint 17 with the inner surface of the outer cylinder 17 is formed on the inner surface of the end face portion 8.
- the outer peripheral reinforcing layer 11 is provided at a distance more than the length of the outer peripheral reinforcing layer 11.
- FIG. 9 shows that the outer peripheral reinforcing layer 18 connected to the outer peripheral reinforcing layer 11 of FIG. 8 and having a thickness smaller than the reinforcing layer 11 is formed up to the other end surface 7-2 of the honeycomb. It is provided on all outermost side surfaces of the outer peripheral reinforcing layers 11 and 18.
- FIG. 10 shows the outer peripheral reinforcing layer 20 separated from both the inner surface 8â, 1 of the end face 8 and the honeycomb end face 7â2, and FIG. The outer peripheral reinforcing layer 22 reaching the other end face 7-2 of the honeycomb body is shown.
- the joint with the inner surface of the outer cylinder is configured to be longer than the upper and lower ends of the outer peripheral reinforcing layer 20, and in FIG. 11, it is configured to be approximately the same length 23 as the outermost peripheral side of the outer peripheral reinforcing layer 22. .
- FIG. 12 shows an example in which another end face 9 is provided on the end face 1-2 of the honeycomb body shown in FIG. 10, and FIG. 13 omits the outer peripheral reinforcing layer 11 shown in FIG. Is formed to have substantially the same length as the outermost peripheral side surface of the outer peripheral reinforcing layer 20.12.
- FIG. 14 shows the improvement of the connection between the axial end face 8 and the outer peripheral reinforcing layer 14, and the connection depth is gradually increased from the center of the inner face of the axial end face 8 toward the outer peripheral side face.
- FIG. 15 shows an example in which the connecting portion in the case of a honeycomb body having both end portions 8 and 9 is constituted by corner connecting portions 23 and 24, and the details of the configuration are the same as those in FIG. It is.
- connection corner between the end face portion and the outer peripheral reinforcing layer is continuously increased from the center of the end face portion toward the outer peripheral side face, stress concentration does not occur at the corner connection portion, and The strength of the rubber body can be maintained high. It should be noted that the same effect can be obtained by changing the shape linearly in addition to changing the shape as shown in the figure.
- the outer peripheral side surface of the honeycomb body and the inner surface of the metal outer cylinder are joined to each other within a range not exceeding the position of the inner surface of the axial end surface portion.
- high-temperature strength is more important than thermal fatigue resistance.
- the joining of the metal outer cylinder and the honeycomb body is performed not only on the outer peripheral reinforcing layer but also on a part of the axial end face.
- FIG. 16 An example of the above metal carrier is shown in FIG. In FIG. 16, the joint between the outermost peripheral side surface of the honeycomb body and the inner surface of the outer cylinder is formed on the entire outermost peripheral side surface of the outer peripheral reinforcing layer 14 and a part of the outermost peripheral side surfaces of both end portions 8 and 9. Further, as a structure of another outer peripheral reinforcing layer to which such a configuration is suitable, it is particularly preferable to use a honeycomb body as shown in FIGS. 4, 10 and 12. Another embodiment of FIG. 16 is shown in FIG. In this embodiment, in addition to the joining 21 of the outer peripheral reinforcing layer 20, a part of the outermost peripheral side surface of the end face 8 and the inner surface of the outer cylinder 4 are joined 28. Even in the case of such a small carrier, it is necessary to avoid joining the entire outermost side surface of the end face portion due to the thermal stress.
- FIG. Fig. 3 shows a stainless steel outer cylinder with an inner diameter of 100 mm, a thickness of 1.5 mm, a length of lOOmra, and a roll of 36 rolls of a 50 mm thick 20Cr-15A â stainless steel corrugated foil.
- FIG. Fig. 3 shows a stainless steel outer cylinder with an inner diameter of 100 mm, a thickness of 1.5 mm, a length of lOOmra, and a roll of 36 rolls of a 50 mm thick 20Cr-15A â stainless steel corrugated foil.
- the 8.9 part on both ends of the honeycomb part is brazed with corrugated foil and flat foil from the outer surface 8-2, 9-2 to a depth of 10 strokes. The corresponding surface has not been brazed.
- the intermediate portion 10 in the axial direction of the honeycomb body connected to the outer peripheral reinforcing layer has only a part of the outermost peripheral side brazed to the inner surface of the outer cylinder 4, and the remaining part 10 is completely brazed. Was not done.
- Fig. 18 shows a comparative example, which is a metal carrier of the same size as that of Fig. 3, but the inside 29 of the honeycomb is brazed with corrugated and flat foils as a whole, Was brazed.
- â -alumina powder with Pt catalyst supported on the above two types of metal carriers is baked, mounted on a 2,000 cc engine, and bench tested for 800 min. 1 min., 150 min. 1 min. The thermal test was repeated for a total of 15 minutes, including heating and cooling.
- one of the first to third honeycombs from the outer periphery of the honeycomb broke along the entire circumference after 80 cycles, and the inner honeycomb was shifted by about 20 images to the leeward side of the exhaust gas. .
- FIG. 3 shows a comparative example, which is a metal carrier of the same size as that of Fig. 3, but the inside 29 of the honeycomb is brazed with corrugated and flat foils as a whole, Was brazed.
- FIG. 4 shows another embodiment of the present invention, and shows an axial cross section of a metal carrier having the same material and dimensions as those in FIG. 8 and 9 are the axial end faces (100 picture) where the contact points of the flat and corrugated foils of all layers of the honeycomb are joined by resistance welding to a depth of 7-1.7-2 to 15 mm at the stage of winding the foil.
- Example 3 The carrier was subjected to a thermal test using an engine bench under the same conditions as in Example 1, but no structural abnormality occurred even after 1000 cycles.
- Example 3 The carrier was subjected to a thermal test using an engine bench under the same conditions as in Example 1, but no structural abnormality occurred even after 1000 cycles.
- FIG. 5 shows another embodiment of the present invention, and shows an axial section of a metal carrier having the same material and dimensions as those of FIG. 8 and 9 are axial end faces (100 â X X 20 mm i) that are laser-welded from both outer surfaces to a depth of 20 mm, respectively, at the stage when all layers of the honeycomb are wrapped in foil.
- 11 and 12 are the outermost 9th volume from the outermost periphery, and the outer periphery is laser welded from the inner surface of 8 and 9 to the depth of 10 nun at the part of the intermediate part connected to 8 and 9
- Reinforcement layer (77Z100 â 0 x 10 strokes â ): 14 is the outer periphery reinforcement layer which is also laser welded from the outermost circumference to the second volume in the entire length of the center connected to 11 and 12
- the carrier was subjected to a cooling test with an engine bench under the same conditions as in Example 1, but no structural abnormality occurred even after 1000 cycles.
- FIG. 6 shows a longitudinal section of another embodiment of the metal carrier of the present invention.
- Heat- and oxidation-resistant ferrite stainless steel with a thickness of 50% ( â component: Cr 24wt%, A £ 4.5wt%, C e and other REM 0.09wt%, balance Fe)
- Flat foil and corrugated foil are stacked and rolled to form a honeycomb body (outer diameter 137 mm) with a total of 55 turns, outer diameter 140 mni, thickness 1.5 mm.
- the constructed metal carrier is shown. 8 and 9 have flat foil and corrugated foil on the outer surface An axial end face portion joined by brazing to a depth of more than 20 min.
- Reference numeral 14 denotes an outer peripheral reinforcing layer in which the entire length of the axially intermediate portion from the outermost periphery to the fifth turn is joined.
- the outermost peripheral side surface of the outer peripheral reinforcing layer 14 and the inner surface of the outer cylinder 4 are brazed 16 with a joining length of 50 °.
- the inner surfaces 8-1, 9-1 of the axial end surfaces 8, 9 to the end surfaces W-1, W-2 of the brazing portion 16 are joined at a distance of 5 mra in the axial direction. I have.
- Reference numeral 10 denotes an unjoined portion inside the carrier.
- FIG. 19 is a comparative example showing a metal carrier of the same size as that of Example 4 (FIG. 6) in which the outer peripheral reinforcing layer 14 is not formed between the axial end surfaces 8.9.
- FIG. 20 shows the metal carrier of the comparative example of FIG. 19, in which the joining length between the honeycomb and the outer cylinder is set to 80 countries, and five references are made from the inner surfaces 8-1, 9-1 of the axial end surfaces 8, 9, respectively.
- This is a comparative example in which a joining portion 31 that extends beyond the end face is formed.
- FIG. 21 shows a metal carrier of the same size as in Example 4 (FIG. 6), which was brazed from the outermost periphery of the honeycomb body to the 20th turn, which is one-fourth or more of the total number of turns. Is a comparative example.
- FIG. 7 shows a longitudinal section of another embodiment of the metal carrier of the present invention.
- the axial end face of the honeycomb body is formed on only one side.
- the carrier size is 75 mm in diameter and 110 mm in length, but the number of windings of the honeycomb body is 29, and the outer peripheral reinforcing layer is two turns from the outermost circumference, making the total length of the middle part.
- the lower end of the outer peripheral reinforcing layer 14 is in contact with the end face 7-2 of the honeycomb body, and the junction 16 between the outermost peripheral side surface of the outer peripheral reinforcing layer 14 and the inner surface of the outer cylinder 4 has its end face W-2 connected to the end face of the honeycomb body. It is made on the opposite side of the end face portion 8 so that it comes into contact with 2. Therefore, the inner face 8-1 of the end face 8 and the end face Wâ The spacing of 1 was 30 mm.
- the above metal support was subjected to a thermal cycle test under the same conditions as in Example 4 for 1,000 cycles, and no abnormalities were observed.
- the same size was made into the structure shown in Fig. 20, and the same test was performed, and the displacement occurred in 85 cycles.
- the thermal stress in the axial direction of the honeycomb, especially in the vicinity of the outer peripheral portion, is large, and the honeycomb is easily broken. confirmed.
- FIG. 11 shows a joining state of another embodiment of the present invention.
- the upper end of the outer peripheral reinforcing layer 14 of the fifth embodiment is largely separated from the inner surface 8-1 of the axial end face 8.
- the carrier size is the same as that of the fourth embodiment, but the upper end of the outer peripheral reinforcing layer 22 is arranged at a distance of 60 from the inner surface 8-1 of the end face. Therefore, the length of the outer peripheral reinforcing layer was 20 strokes, and the joint length with the outer cylinder 4 was also 20 mm.
- the carrier was heated to 800 with a gas burner, and cooled and cooled to 100 with air, and 500 cooling / heating cycles were performed. As a result, no honeycomb breakage, bond separation, or honeycomb distortion occurred. When the same size was made into the structure shown in Fig. 18 and subjected to burner test in the same manner, many damages such as buckling and gaps in the honeycomb and honeycomb breakage occurred in 300 cycles.
- Example 7
- FIG. 15 shows another embodiment of the present invention.
- the connecting portion between the end face in the axial direction of the honeycomb and the outer peripheral reinforcing layer is a curved corner connecting portion.
- the carrier size is the same as in Example 4
- the joint depth in the axial direction of the end face portions 8 and 9 is referred to for 10 times, and the joint depth is gradually deepened from the center of the end face portion to the sixth outermost round from the outermost periphery.
- the corner joints 23 and 24 were configured so that the joint depth was 30 strokes.
- the outermost reinforcing layer 14 was formed by joining the entire length from the outermost circumference to the fifth roll.
- the joint between the outer peripheral reinforcing layer 14 and the outer cylinder 4 has a length of 40 strokes, and the side surface of the end face and the outer cylinder are not joined.
- FIG. 16 shows another embodiment of the present invention.
- This example has a total of 24 turns with 63 strokes and length lOOfflin.
- the joint length between the outermost side surface of the honeycomb and the inner surface of the outer cylinder was set to 80 mm, and the joint length of the outermost layer side surfaces of the end faces 8 and 9 was set to 20 mm each.
- the outer circumferential reinforcing layer was made into one roll and the total length of the middle part was set.
- the above carrier was mounted in an exhaust manifold and the same cooling test as in Example 4 was repeated 1,000 times. As a result, no abnormality was found.
- the thermal stress in the radial direction becomes relatively small as the temperature distribution becomes smaller, and therefore, it must withstand external forces such as engine vibration and exhaust gas pressure due to the heat stress.
- the above-mentioned carrier has a large joint area between the honeycomb and the outer cylinder to prevent the joint of the carrier from being destroyed. is there
- the present invention has sufficient thermal fatigue resistance and sufficient strength even when repeatedly subjected to severe thermal cycles in the exhaust system of an automobile engine for a long time, and has a large practical effect.
- a metal carrier for supporting the catalyst could be manufactured.
- the use of brazing material is small and the production is easy, so it is low cost and has great industrial value.
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP89911100A EP0389645B1 (en) | 1988-10-04 | 1989-10-04 | Metal carrier having thermal fatigue resistance for automobile exhaust gas cleaning catalysts |
DE68921876T DE68921876T2 (de) | 1988-10-04 | 1989-10-04 | MetalltrÀger mit widerstand gegen thermische ermÌdung bei abgasfahrzeugkatalysatoren. |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24899488 | 1988-10-04 | ||
JP63/248994 | 1988-10-04 | ||
JP9434589 | 1989-04-14 | ||
JP1/94345 | 1989-04-14 | ||
JP1/110610 | 1989-04-28 | ||
JP11061089 | 1989-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990003842A1 true WO1990003842A1 (en) | 1990-04-19 |
Family
ID=27307523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1989/001015 WO1990003842A1 (en) | 1988-10-04 | 1989-10-04 | Metal carrier having thermal fatigue resistance for automobile exhaust gas cleaning catalysts |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0389645B1 (ja) |
JP (1) | JPH0545298B1 (ja) |
DE (1) | DE68921876T2 (ja) |
WO (1) | WO1990003842A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6908028B2 (en) | 2000-10-10 | 2005-06-21 | Nippon Steel Corporation | Method of manufacturing honeycomb body |
JP2006175346A (ja) * | 2004-12-22 | 2006-07-06 | Nippon Steel Corp | æ§é èä¹ æ§ã«åªãã觊åªæ æçšã¡ã¿ã«æ äœ |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0815559B2 (ja) * | 1990-11-13 | 1996-02-21 | æ°æ¥æ¬è£œéµæ ªåŒäŒç€Ÿ | èç±å¿åã»èç±ç²åŽç¹æ§ã®åªããã¬ãŒã¹ãã©ãã¯åèªåè»æã¬ã¹è§Šåªçšéå±æ äœ |
US6554892B1 (en) | 1999-07-02 | 2003-04-29 | Imerys Kaolin, Inc. | Compositions and methods for making a coarse platey, high brightness kaolin product |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62273051A (ja) * | 1986-05-12 | 1987-11-27 | ã·ãŒã¡ã³ã¹ãã¢ã¯ããšã³ã²ãŒã«ã·ã€ãã | 觊åªæ äœçšããã«ã äœããã³ãã®è£œæ³ |
JPS62194436U (ja) * | 1986-06-02 | 1987-12-10 | ||
JPH06245345A (ja) * | 1993-02-10 | 1994-09-02 | Furukawa Electric Co Ltd:The | ã±ãŒãã«é ç·æ§é |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2052624B (en) * | 1979-06-16 | 1983-04-13 | Lucas Industries Ltd | Fuel supply system for an engine |
DE3634235C1 (de) * | 1986-10-08 | 1988-03-31 | Sueddeutsche Kuehler Behr | Matrix fuer einen katalytischen Reaktor zur Abgasreinigung |
-
1989
- 1989-10-04 WO PCT/JP1989/001015 patent/WO1990003842A1/ja active IP Right Grant
- 1989-10-04 DE DE68921876T patent/DE68921876T2/de not_active Expired - Lifetime
- 1989-10-04 EP EP89911100A patent/EP0389645B1/en not_active Expired - Lifetime
- 1989-10-04 JP JP1510421A patent/JPH0545298B1/ja not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62273051A (ja) * | 1986-05-12 | 1987-11-27 | ã·ãŒã¡ã³ã¹ãã¢ã¯ããšã³ã²ãŒã«ã·ã€ãã | 觊åªæ äœçšããã«ã äœããã³ãã®è£œæ³ |
JPS62194436U (ja) * | 1986-06-02 | 1987-12-10 | ||
JPH06245345A (ja) * | 1993-02-10 | 1994-09-02 | Furukawa Electric Co Ltd:The | ã±ãŒãã«é ç·æ§é |
Non-Patent Citations (1)
Title |
---|
See also references of EP0389645A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6908028B2 (en) | 2000-10-10 | 2005-06-21 | Nippon Steel Corporation | Method of manufacturing honeycomb body |
JP2006175346A (ja) * | 2004-12-22 | 2006-07-06 | Nippon Steel Corp | æ§é èä¹ æ§ã«åªãã觊åªæ æçšã¡ã¿ã«æ äœ |
JP4684645B2 (ja) * | 2004-12-22 | 2011-05-18 | æ°æ¥éãããªã¢ã«ãºæ ªåŒäŒç€Ÿ | æ§é èä¹ æ§ã«åªãã觊åªæ æçšã¡ã¿ã«æ äœ |
Also Published As
Publication number | Publication date |
---|---|
DE68921876T2 (de) | 1995-07-20 |
EP0389645A4 (en) | 1990-12-27 |
DE68921876D1 (de) | 1995-04-27 |
EP0389645A1 (en) | 1990-10-03 |
JPH0545298B1 (ja) | 1993-07-08 |
EP0389645B1 (en) | 1995-03-22 |
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