WO1996038657A1 - Dispositif de controle de l'emission de polluants dans les gaz d'echappement pour moteurs a combustion interne - Google Patents
Dispositif de controle de l'emission de polluants dans les gaz d'echappement pour moteurs a combustion interne Download PDFInfo
- Publication number
- WO1996038657A1 WO1996038657A1 PCT/JP1996/001474 JP9601474W WO9638657A1 WO 1996038657 A1 WO1996038657 A1 WO 1996038657A1 JP 9601474 W JP9601474 W JP 9601474W WO 9638657 A1 WO9638657 A1 WO 9638657A1
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- WIPO (PCT)
- Prior art keywords
- catalyst carrier
- exhaust gas
- electrically heated
- ring
- exhaust
- Prior art date
Links
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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
-
- B01J35/33—
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—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 methods of operation; Control
- F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
- F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
-
- 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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/18—Exhaust treating devices having provisions not otherwise provided for for improving rigidity, e.g. by wings, ribs
-
- 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
- F01N2330/04—Methods of manufacturing
-
- 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
- F01N2330/06—Ceramic, e.g. monoliths
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust gas purification device for an internal combustion engine, and more particularly to an electric heating type catalytic device capable of quickly raising its temperature to a catalytic activation temperature by generating a heat by energizing a metal honeycomb body as a catalyst carrier.
- the exhaust gas emitted from the internal combustion engine mounted on the vehicle contains harmful substances such as HC (hydrocarbon), CO (carbon oxide), and ⁇ (nitrogen oxide).
- the exhaust passage is generally provided with a catalytic converter as an exhaust gas purifying device for purifying exhaust gas.
- a catalytic converter as an exhaust gas purifying device for purifying exhaust gas.
- the three-way catalyst used in this catalytic converter has a low purification rate of harmful substances in exhaust gas when the temperature of the catalyst is low (inactive state). Therefore, the exhaust gas cannot be sufficiently purified when the catalyst is inactive after the cold start of the internal combustion engine.
- a metal is used for the catalyst carrier, and when the internal combustion engine is started or the catalyst is in an inactive state, electricity is supplied to this metal carrier, thereby causing the metal catalyst carrier itself to generate heat and quickly bringing the catalyst activation temperature (300 to 400 (° C)), an exhaust gas purification device equipped with an electrically heated catalyst device has been proposed.
- the exhaust gas purifying system has an electrically heated catalyst carrier 2 and a main catalyst carrier, which generate heat when energized, in a cylindrical metal outer cylinder 1 connected to the exhaust gas passage of the internal combustion engine. 3 are arranged in series at a predetermined interval.
- Electric heating type catalyst carrier 2 has medium A core electrode 6 is provided, and the center electrode 6 is led out of the metal outer cylinder 1 via an electrode portion 8A.
- a battery 9 and a switch SW are connected between the electrode portion 8A and an external electrode 8B provided on a part of the metal outer cylinder 1. When the switch SW is turned on, the battery 9 is turned on. Electricity is applied to the heated catalyst carrier 2 to generate heat.
- the electrically heated catalyst carrier 2 has a corrugated metal foil 4 (hereinafter referred to as corrugated foil 4) and a flat metal foil 5 (hereinafter referred to as flat foil 5). And the ends in the longitudinal direction are joined to the center electrode 6, and then wound around the center electrode 6 with the corrugated foil 4 and the flat foil 5 superimposed on each other, and the convoluted spiral It is composed of a metal foil laminate (honeycomb body) 7 in the shape of a circle.
- Such corrugated foil 4 and flat foil 5 are generally made of an iron-based alloy containing aluminum (for example, 20% Cr—5% A 1-75% Fe), and have a thickness of about 50 m. Is used.
- FIG. 30 (b) shows one end face of the honeycomb body 7 composed of the corrugated foil 4 and the flat foil 5 made of metal.
- the honeycomb body 7 has an axial passage P formed by the gap between the corrugated foil 4 and the flat foil 5. It is spirally arranged around the center electrode 6.
- An exhaust purification catalyst is carried on the surfaces of the corrugated foil 4 and the flat foil 5. Therefore, when the switch SW shown in FIG. 29 is turned on to energize the honeycomb body 7 to raise the temperature to the catalyst activation temperature, the exhaust gas flows through the above-described passage P, and the exhaust gas is exhausted. The harmful components come into contact with the catalyst and the exhaust gas is purified.
- the exhaust gas purification device configured as described above is electrically heated by high-temperature and high-speed exhaust gas flowing through the exhaust gas passage, heating while the engine is running, cooling heat cycle when the engine is stopped, and vibration transmitted from the engine and the vehicle.
- the honeycomb foil 7 of the honeycomb catalytic device has a gap between the corrugated foil 4 and the flat foil 5 (hereinafter referred to as scoving), or the foil has been broken or broken. In some cases, the function as an electrically heated catalyst carrier may be reduced.
- a honeycomb body holding structure in which a downstream end face of the exhaust gas of the honeycomb body 7 is supported by a cross-shaped metal bar 70 traversing in contact therewith, and the tip of the metal bar is fixed to the outer cylinder 1. Have been.
- Japanese Patent Application Laid-Open No. 5-269389 discloses that a single support bar covered with an insulating strip supports the downstream end surface of the honeycomb body in contact with the support bar, and this support bar is supported by an outer metal housing ( An electrically heated catalyst device welded to the outer cylinder is also disclosed.
- the electrically heated catalyst is used to improve the flexibility of the main catalyst carrier.
- the fixing pin for fixing the support bar comes into contact with the main catalyst carrier, causing the electrically heated catalyst to short, and the electrically heated catalyst
- the heating performance of the catalyst carrier may be affected.
- any of the conventional honeycomb body holding structures has a problem, and it is hard to say that it is particularly suitable as a honeycomb body holding structure for an electrically heated metal catalyst carrier.
- An object of the present invention is to provide an electrically heated metal catalyst carrier that does not have the problems as in the above-mentioned conventional honeycomb body holding structure in the catalyst carrier.
- the present invention prevents the scoping of the electrically heated catalyst carrier, does not significantly increase the weight of the structure holding the electrically heated catalyst carrier, and can also operate the engine after the vehicle is mounted.
- An object of the present invention is to provide an electric heating type catalyst device having improved durability without fear of destruction due to a difference in thermal expansion between a support bar and a support bar holding member.
- Another object of the present invention is to provide an exhaust gas purifying apparatus which further improves the warm-up property of a metal main catalyst carrier as close as possible to the electrically heated catalyst carrier without shorting the electrically heated catalyst.
- the present invention provides an exhaust gas purification apparatus for an internal combustion engine having an electrically heated catalyst carrier and a main catalyst carrier, wherein the exhaust gas flowing through the electrically heated catalyst carrier is downstream of the catalyst carrier.
- a plurality of insulating ceramic bars are disposed so as to cross the end face of the catalyst carrier, and both end portions of the ceramic bar are located near the outer periphery of the electrically heated catalyst carrier. It features an electrically heated catalyst device that is configured to be held.
- an insulating ceramic bar composed of a material containing nitrogen gay or alumina as a main component is provided on the exhaust downstream end surface of the catalyst carrier, particularly between the honeycomb body center and the metal outer cylinder. Noho center part And a plurality thereof are arranged at symmetrical positions around the center portion while traversing the end face so as to support the central portion.
- both ends of the ceramic bar are fitted and held in the vicinity of the outer periphery of the electrically heated catalyst carrier, for example, by a pin fixed in the catalyst carrier or a holding portion of a ring-shaped holding member fixed to a metal outer cylinder. I do. Accordingly, even if the honeycomb body is deformed due to the thermal expansion or cooling / shrinking action, only the holding portion is deformed and moved, so that no stress is applied to the ceramic bar, and destruction between the honeycomb body and the ceramic bar is prevented. The durability of the electrically heated catalyst carrier can be improved without generation.
- the elastic material absorbs the difference in thermal expansion between the two and is more effective in preventing breakage.
- recesses or through holes are provided at both ends on the exhaust downstream side of the ceramic bar, and pins are inserted into these recesses or through holes so that the head of the pin is lower than the surface of the ceramic bar and the tip of the pin.
- FIG. 1 (a) is a plan view of an electrically heated catalyst device according to an embodiment of the present invention
- FIG. 1 (b) is a cross-sectional view taken along line II of FIG. 1 (a).
- FIG. 2 is an assembly perspective view for explaining a state in which the honeycomb body is mounted on the holding member and the ceramic bar of the embodiment of FIG.
- FIG. 3 (a) is a cross-sectional view taken along the line ⁇ in FIG. 1 (b)
- FIG. 3 (b) is a partially enlarged view showing the configuration of the elastic material in FIG. 3 (a)
- FIG. It is a fragmentary sectional view showing other examples of A section of the same figure (a).
- FIG. 4 is a cross-sectional view showing a configuration of an electrically heated catalyst device according to another embodiment of the present invention.
- FIG. 5 (a) is a cross-sectional view showing a configuration of an electric heating type catalyst device according to another embodiment of the present invention
- FIG. 5 (b) is a ring for explaining a method of manufacturing the holding member of FIG. It is sectional drawing of a shape holding part.
- FIG. 6 is an assembly perspective view for explaining a state where a ceramic bar is attached to the ring-shaped holding member of FIG. 5 (a) via an elastic material.
- FIG. 7 is a cross-sectional view showing the configuration of an electrically heated catalyst device according to another embodiment of the present invention.
- FIG. 8 (a) is a plan view showing the shape of the ring-shaped holding member of FIG. 7
- FIG. 8 (b) is a cross-sectional view taken along the line DI-1 ⁇ of FIG. 7 (a)
- FIG. FIG. 3 is a perspective view of the ring-shaped holding member of FIG.
- FIG. 9 is an assembly for explaining the structure of a ring-shaped holding member in an electric heating type catalytic converter according to another embodiment of the present invention and a state in which a ceramics bar is attached to the ring-shaped holding member via an elastic material. It is a perspective view.
- FIG. 10 (a) is a bottom view of the downstream side of the exhaust showing an example of a ceramic bar holding structure in an electrically heated catalyst carrier according to another embodiment of the present invention
- FIG. 10 (b) is a view of FIG. FIG. 5 is a sectional view taken along line V—W.
- FIG. 11 (a) is a bottom view of the downstream side of the exhaust showing an example of a ceramic bar holding structure in an electrically heated catalyst carrier according to another embodiment of the present invention
- FIG. 11 (b) is a view of FIG.
- FIG. 4 is a perspective view showing a locked state of the ceramic bar and the ring-shaped holding member in ().
- FIG. 3C is a plan view showing a locked state between the ceramic bar and the ring-shaped holding member according to another embodiment of the present invention, and FIG. It is sectional drawing.
- Fig. 12 (a) is a plan view of an electrically heated catalyst carrier showing an example of the arrangement of joints and an example of an arrangement of reinforcing layers for forming an energized heating section
- Fig. 12 (b) is a partial cross-section showing an example of the structure of an enhancement layer.
- the front view, and FIG. 3 (c) is a partially enlarged plan view of the reinforcing layer.
- FIG. 13 (a) is a cross-sectional front view of an exhaust emission control device according to an embodiment of the present invention
- FIG. 13 (b) is a cross-sectional front view of an exhaust emission control device according to another embodiment of the present invention.
- It is a sectional front view of an exhaust gas purification device of an example of an embodiment.
- Fig. 15 (a) is a bottom view of the electrically heated catalyst carrier of Fig. 14 on the exhaust downstream side
- Fig. 15 (b) is a cross-sectional view taken along the line VV in Fig. 14 (a)
- Fig. 15 (c) is Fig.
- FIG. 1 is an enlarged schematic view of part B, and (d) is a partially enlarged view showing an example of a fixing structure between the end of the ceramic bar, the U-shaped pin and the reinforcing layer, and Fig.
- the figure is a cross-sectional view taken along the line VI-VI in the figure (d).
- FIGS. 16 (a) to 16 (e) are bottom views of the exhaust gas downstream side showing an example of the arrangement of the ceramics bar in the electrically heated catalyst carrier of the present invention.
- FIG. 17 is a sectional front view of an exhaust gas purifying apparatus for an internal combustion engine according to another embodiment of the present invention.
- FIG. 18 is an assembly perspective view for explaining the assembly of the electrically heated catalyst device constituting the exhaust gas purification device of FIG.
- FIG. 19 is a partially enlarged sectional view taken along line VE-1 in FIG.
- FIG. 20 is a cross-sectional front view of an exhaust emission control device according to another embodiment of the present invention.
- FIG. 21 is a cross-sectional front view of an exhaust emission control device according to another embodiment of the present invention.
- 23 (a) to 23 (d) which are cross-sectional front views of the exhaust gas purifying apparatus of the embodiment shown in FIGS. 23 and 23 are used for the exhaust gas purifying apparatus of the embodiment shown in FIGS. 17 and 20 to 22. 4 shows an embodiment of a pin.
- FIG. 24 is a cross-sectional front view of an exhaust gas purifying apparatus according to another embodiment of the present invention.
- FIG. 25 (a) is an assembled perspective view for explaining the mounting state of the ceramic bar and the pin of FIG. (B) is a partially enlarged sectional view of the coronal ring line in FIG. 24.
- FIG. 26 is a sectional front view of an exhaust gas purifying apparatus according to another embodiment of the present invention.
- FIGS. 27 (a) to 27 (d) show the exhaust gas purifying apparatus of the embodiment shown in FIGS. 24 and 26. 1 shows an embodiment of a pin used for the present invention.
- FIG. 28 is an assembled perspective view showing another embodiment of the ceramics bar and the pin used in the exhaust gas purification apparatus of the embodiment shown in FIGS. 24 and 26.
- FIG. 29 is a cross-sectional front view showing a structural example of a conventional exhaust gas purification device.
- Fig. 30 (a) is a partial perspective view for explaining a known method for forming a honeycomb body
- Fig. 30 (b) is a plan view schematically showing an end face of the honeycomb body wound by the method shown in Fig. 30 (a). It is.
- FIG. 31 (a) shows a part for explaining another known method for forming a honeycomb body.
- FIG. 4B is a perspective view, and FIG. 4B is a plan view schematically showing an end face of the honeycomb body formed by the forming method shown in FIG.
- FIG. 32 is a bottom view of an electrically heated catalyst device showing an example of a honeycomb body holding structure in a known catalyst carrier.
- FIG. 1 (a) is a plan view of an electric heating type catalyst device 10 of an embodiment using a ring-shaped holding member of the present invention
- FIG. 1 (b) is a diagram showing I-I of FIG. 1 (a).
- FIG. 2 is a vertical sectional view taken along the line
- FIG. 2 is an assembly perspective view for making the holding structure of the electrically heated catalyst carrier of FIG. 1 easier to understand
- FIG. 3 (a) is a perspective view of FIG. 1 (b).
- FIG. 3 is a horizontal sectional view taken along line ⁇ - ⁇ .
- a honeycomb body composed of the corrugated foil 4 and the flat foil 5 described in FIG. 7 is inserted.
- a central electrode 6 is provided at the center of the honeycomb body 7, and the central electrode 6 is connected to an electrode portion 8A provided on the outer peripheral surface of the metal outer cylinder 1 by a lead portion 6A.
- the peripheral portion of the lower end face of the honeycomb body 7 is cut out to form a ring-shaped notch 14.
- the notch 14 serves as a mounting space for a ring-shaped holding member 20 described later.
- the metal outer cylinder 1 is extended in the downstream direction of the exhaust gas flow from the mounting portion of the honeycomb body 7, and the extension 11 is provided with a ceramics bar as an insulating retainer of the honeycomb body 7. 22 and a ring-shaped holding member 20 for holding the ceramic bar are attached.
- Ring shape As shown in FIG. 2, the holding member 20 includes a cylindrical metal cylinder 12 made of a thin metal. The outer diameter of the metal cylinder 12 is in contact with the inner diameter of the metal outer cylinder 1. On the upper end side of the metal tube 12, four holding portions 21 are formed.
- the holding portion 21 is formed by subjecting the outer peripheral surface of the metal tube 12 to a burring process, and has a cylindrical shape protruding inward from the metal tube 12.
- the two opposing holding parts 21 of the four holding parts 21 are formed at positions where their cylindrical shapes are coaxially continuous with the internal space of the metal cylinder 12 interposed therebetween. As shown in FIG. 3 (a), the two opposing holding parts 21 are located symmetrically with respect to a center line CL passing through the center of the metal cylinder 12.
- a ceramics bar 22 is stretched across an elastic member 23 between opposed holding portions 21 of the metal cylinder 12 configured as described above.
- the ceramics bar 22 has a cylindrical shape as shown in FIG. 2, and a plane 22A having a predetermined length is formed at the center thereof.
- This plane 22A is for mounting the bottom surface 15 of the honeycomb body 7.
- the two-dot chain line shown in FIG. 3 (a) indicates the position of the bottom surface 15 of the honeycomb body 7, the plane 22A has a length that allows the bottom surface 15 of the honeycomb body 7 to be stably placed, and the ceramic mix bar.
- Reference numeral 22 is provided at a position supporting a substantially central portion between the center electrode of the honeycomb body 7 and the metal outer cylinder.
- the elastic material 23 is formed by collecting and knitting a thin heat-resistant metal wire (for example, a metal wire having a diameter of about 0.1 to 0.5 mm). It is formed by molding to a predetermined density by a press die or the like, and in this embodiment, has a cylindrical shape as shown in FIG. During this molding, the maximum diameter (outer diameter) of the elastic member 23 when no external force is applied is formed larger than the inner diameter of the holding portion 21, and the minimum diameter (inner diameter) is larger than the outer diameter of the ceramic bar 22. It is formed small. Ma The elastic member 23 is deformed when subjected to an external force, and its maximum diameter and minimum diameter change. The elastic material 23 is fitted to both ends of the ceramic bar 22 with the minimum diameter enlarged. The ceramic bar 22 with the elastic members 23 fitted at both ends is stretched between the opposing holding parts 21 in a state where the elastic members 23 are compressed.
- a thin heat-resistant metal wire for example, a metal wire having a diameter of about 0.1 to 0.5 mm.
- the ceramic bar 22 When the ceramic bar 22 is actually put between the holding parts 21 facing each other, first, the ceramic bar 22 is put between the holding parts 21, and in this state, the ceramic bar 22 is put on both ends of the ceramic bar 22. What is necessary is just to fit the elastic member 23 while compressing it.
- the ring-shaped holding member 20 constituted by the ceramic bar 22 being stretched between the holding portions 21 formed facing the metal cylinder 12 via the elastic material 23 is shown in FIG.
- (b) it is inserted from the extension portion 11 side of the metal outer cylinder 1, and is fixed in a state where the plane 22 A of the ceramics bar 22 is in contact with the bottom surface 15 of the honeycomb body 7.
- the ceramic bar 22 functions as a retainer for preventing scoving of the honeycomb body 7, and the ceramic bar is held by the ring-shaped holding member 20.
- the elastic member 23 can move from the holding portion 21 to the inside of the metal tube 12. There is no danger of getting out.
- two sets of the holding parts 21 facing the metal cylinder 12 are formed, and the ceramics bar 22 is wrapped around each of the sets via the elastic material 23, but the number of the sets of the holding parts 21 is The number of the two sets, ie, the number of the ceramic bars 22 is not limited to two.
- the holding of the honeycomb body 7 can be achieved by one assembly using the metal cylinder 12, the ceramic mix bar 22, and the elastic material 23.
- the holding portion 21 provided on the metal tube 12 by the pearling process has a wide holding surface with respect to a mere hole, so that the ceramic bar 22 can be prevented from falling off and the holding portion 21 from being worn.
- the elastic material 23 reduces the external force on the ceramics bar 22 due to deformation and distortion of the metal tube 12 due to temperature and the like, and prevents the damage thereof.
- the elastic member 23 is used when the ring-shaped holding member 20 to which the ceramics bar 22 is attached is attached to the downstream side of the honeycomb body 7 in the metal outer cylinder 1.
- FIG. 4 is a cross-sectional view showing a configuration of an electrically heated catalyst device 10B according to another embodiment of the present invention, which is a modified example of the electrically heated catalyst device 10A of FIG.
- the electrically heated catalyst device 10B has the same configuration as the embodiment of FIG.
- the skirt on the downstream side with respect to the flow of the exhaust gas of the metal cylinder 12 thus formed is formed as an extension 12E extending beyond the extension 11 of the metal outer cylinder 1.
- the main catalyst device 30 is formed in the extended portion 12E so as to be adjacent to the main catalyst carrier 3 and the honeycomb body 7.
- the ring-shaped holding member 20 is integrated with the downstream main catalyst device. Welding points required when connecting the catalyst device 10A to the main catalyst device can be eliminated. As a result, the reliability of the exhaust gas purification device can be ensured and the cost can be reduced. In addition, since the main catalyst carrier 3 is arranged close to the electrically heated honeycomb body 7, the warm-up property of the main catalyst carrier 3 is improved.
- FIG. 5 (a) is a cross-sectional view showing a configuration of an electric heating type catalyst device 10C of another embodiment, and shows a shape of a holding portion 24 provided on a metal cylinder 12 constituting a ring-shaped holding member 20.
- the ring-shaped notch 14 is not formed on the lower end face of the honeycomb body 7.
- the elastic member 25 inserted into the holding part 24 also has a gutter shape (half-slit cylindrical shape).
- the downstream side of the flow of the exhaust gas is formed as a curved surface 26A having a semicircular cross section, and the upstream side is formed as a plane 26B.
- a ring-shaped holding member 20 provided with a gutter-shaped holding portion 24 shown in FIG. 6 is, for example, as shown in FIG. 5 (b), from both ends of a metal cylinder 12 similar to the first embodiment.
- the outer peripheral surface at the same position is subjected to a burring process to form a cylindrical holding portion 21 protruding inward from the metal tube 12, and the metal tube 12 is formed at both ends at a portion at an equal distance from both ends. It can be formed by halving the parallel line P-P and dividing it into two.
- a gutter-shaped elastic material 25 is attached in a compressed state to all the holding portions 24 of the metal tube 12 in the state shown in FIG. When the curved surfaces 26A at both ends of the ceramic bar 26 are pushed into the concave portions 25A of the opposing elastic members 25, the assembly holding the honeycomb body 7 is obtained.
- two ring-shaped holding members 20 are formed from one metal tube 12, so that the cost of processing can be reduced and the amount of materials used can be reduced.
- an extension 20E may be provided in the metal cylinder 12 of the ring-shaped holding member 20, and the main catalyst carrier 3 may be provided in the extension 20E (not shown). ).
- FIG. 7 is a cross-sectional view showing the configuration of an electric heating type catalyst device 10D according to another embodiment of the present invention.
- FIG. 8 (a) shows one end of a metal cylinder 12 constituting a ring-shaped holding member 20.
- the flange portion 27 is formed by being bent inward over the entire circumference.
- Recesses are provided at four points of the flange portion 27 to form a gutter-like holding portion 28.
- Two of the four holding portions 28 are formed at opposing positions so that the trough-shaped concave portions are coaxially continuous with the internal space of the metal tube 12 interposed therebetween. .
- the two opposite sets of holding parts 28 are located at the same positions as the holding parts 24 in the embodiment of FIG.
- the holding portion 28 is formed in a gutter shape, in this embodiment, the same elastic material 25 as that of the embodiment of FIG.
- the same ceramic bar 26 as the embodiment of FIG. 6 can be inserted into the elastic material.
- a gutter-shaped elastic material 25 is compressed in all the holding portions 28 of the metal tube 12 in the state shown in FIGS. 8 (a) to 8 (c). Then, the curved surfaces 26 A are pushed into the trough-shaped recesses 25 A of the elastic material 25 at both ends of the ceramic bar 26, respectively, to obtain an assembly holding the honeycomb body 7.
- the holding member 20 in which the ceramic bar 26 is stretched across the elastic member 25 between the holding portions 28 formed opposite to the flange portion 27 as described above, It is inserted from the extension 11 side of the metal outer cylinder 1, and is fixed in a state in which the plane 26 B of the ceramic bar 26 is in contact with the bottom surface 15 of the honeycomb body 7.
- the ceramic bar 22 functions as a retainer for the honeycomb body 7, and the ceramic bar can be held by the ring-shaped holding member 20.
- one end of the metal cylinder 12 constituting the ring-shaped holding member 20 is bent to form a flange portion 27, so that the entire ring-shaped holding member 20 is formed.
- the rigidity is improved, and it is difficult to deform by heat.
- the flange portion 27 blocks the vicinity of the outer peripheral portion of the honeycomb body 7, exhaust gas with a low purification rate from the vicinity of the outer periphery having poor warm-up characteristics is prevented from flowing downstream.
- an extension 20E may be provided in the metal cylinder 12 of the ring-shaped holding member 20, and the main catalyst carrier 3 may be provided in the extension 20E (not shown). .
- FIG. 9 shows only the structure of the ring-shaped holding member 20 in the electrically heated catalyst device according to another embodiment of the present invention.
- the upper end of the metal tube 12 is depressed into a rectangular shape by press working, and the holding portions 29 are formed at four places.
- Each holding part 29 has three side walls 29 A, There are 29B, 29C, and bottom 29D. The distance from the end of the metal tube 12 on the bottom surface 29D is the same.
- the side walls 29B and 29C of the holding portion 29 where the side walls 29A face each other are on one plane, and the side walls 29A are formed with the respective ceramic bar accommodating grooves 13.
- the ceramics bar 22 and the elastic material 23 used in the embodiment shown in FIG. 1 can be used as they are.
- the distance between the side wall 29B and the side wall 29C in each holding portion 29 needs to be formed smaller than the outer diameter of the elastic member 23.
- the ceramic bar 22 is inserted into the accommodation groove 13 with the side wall 29A of the holding portion 29 serving as a guide.
- the elastic members 23 attached to both ends of the ceramic bar 22 are used.
- the ring-shaped holding member 20 is assembled by being pressed between the side wall 29B and the side wall 29C of the holding portion 29 in a compressed state.
- the ring-shaped holding member 20 in which the ceramic bar 22 is stretched through the elastic member 23 between the holding portions 29 formed opposite to the metal cylinder 12 as described above is shown in FIG.
- the metal outer cylinder 1 is inserted from the extension portion 11 side, and is fixed in a state where the plane 22B of the ceramic bar 22 is in contact with the bottom surface 15 of the honeycomb body 7.
- the ceramic bar 22 functions as a retainer for the honeycomb body 7, and the ceramic bar is held by the ring-shaped holding member 20.
- the electrically heated catalyst device using the embodiment of FIG. 9 has the same effect as the electrically heated catalyst device 10A of the embodiment shown in FIG. Further, as a modification of the embodiment shown in FIG. 9, an extension 20E is provided in the metal cylinder 12 of the ring-shaped holding member 20, and the main catalyst carrier 3 is disposed in the extension 20E. Is also good (not shown).
- FIGS. 10 (a) and (b) and FIGS. 11 (a) and (b) are diagrams showing electric heating type catalyst devices 10E and 10F of another embodiment of the present invention.
- An example is shown in which a ceramics bar is held via a ring-shaped holding member on a catalyst carrier having an outer peripheral reinforcing layer 70 provided on the outer peripheral portion of a rubber body 7.
- the electrically heated catalyst carrier used here is composed of an outer peripheral layer (about 5 layers) near the metal outer cylinder 1 and an inner peripheral layer (about 5 layers) near the electrode 6 at the center of the honeycomb body 7 provided as necessary.
- the joint 45 between the flat foil 5 and the corrugated foil 4 is formed densely to secure the strength, and the outer peripheral reinforcing layer 70 and the inner peripheral reinforcing layer 7 i are formed.
- the inner peripheral strengthening layer is joined to the center electrode 6 and the outer peripheral strengthening layer is joined to the metal outer cylinder 1.
- the honeycomb body 7 and the metal outer cylinder 1 are integrated.
- FIG. 12 (a) shows a current path 35 formed in a spiral shape by locally joining each metal foil from the center portion to the outer peripheral side when the metal foil is formed in a spiral shape.
- FIGS. 10 and 11 show that one or more bonding reinforcing layers 70 are formed on the outer peripheral portion of the honeycomb body 7, and the outer peripheral reinforcing layer 70 is bonded to the metal outer cylinder 1, and the exhaust of the honeycomb body 7 is performed.
- ceramic bars 31 and 33 are disposed so as to cross the non-reinforced layer 7 n of the honeycomb body, and the tip of the ceramic bar is joined to a metal outer cylinder 1 by a ring-shaped fixing member. The values are fixed at 32 and 34.
- Fig. 10 shows the center of a cross-shaped ceramic bar 31 having four legs 31a, 31b, 31c, 31d and annular portions 31e, 31f at the ends of these four legs.
- the holes 31 ⁇ formed in the outer part are loosely fitted to the center electrode 6, each leg is arranged so as to cross the non-reinforced layer 7 ⁇ , and the ring at the tip of the four legs located in the outer peripheral reinforcing layer 7 ⁇
- the portion 31 f is supported by a ring-shaped holding member 32, and the holding member is joined to the metal outer cylinder 1 to support the honeycomb body 7.
- a gap 32a is provided at one location of the ring-shaped holding member 32 to release the stress generated by the heat cycle.
- Fig. 11 (a) and (b) show two ceramic bars 33a and 33b arranged so as to traverse the non-reinforced layer 7n and located on the outer peripheral reinforcing layer 7o.
- the tip of the ceramic bar is supported by a ring-shaped holding member 34, and the holding member is joined to the metal outer cylinder 1 to support the honeycomb body 7.
- FIGS. 11 (c) and 11 (d) show another embodiment of the ring-shaped holding member.
- recesses are formed inwardly over the entire width of the member 36.
- 37 is provided, and a fitting groove 38 is provided at the upper end edge of the concave portion, and the tips of the ceramic bars 33a, 33b are fitted and locked in the fitting groove.
- the ring-shaped holding member 36 is provided with a gap 36a. The recesses reliably prevent the ceramic bar from slipping or falling off.
- FIG. 13 (a) shows a throttle 39C provided by narrowing the tip of the metal cylinder 39 of the ring-shaped holding member 36 instead of the recess 37 of FIG.
- This shows an apparatus in which a main catalyst carrier 3 is disposed in a protruding extension section 39E.
- a ring-shaped holding member 36 shown in FIGS. 11 (c) and (d) is provided on the downstream side of the exhaust of the electrically heated catalyst carrier 2 of the exhaust gas purification device shown in FIG. ing.
- the catalyst carrier 2 can be supported in a state where the ceramic bar is stable, the number of parts can be reduced, and the cost can be reduced.
- an electrically heated catalyst carrier 2 in which an outer peripheral reinforcing layer 70 and an inner peripheral reinforcing layer 7 i are provided on a honeycomb body 7 is used.
- a ceramic bar 41 is provided downstream of the catalyst carrier 2 on the exhaust side, and an electric heating type catalyst device 10G in which both ends of the ceramic bar are held by pins 42 is provided in the exhaust gas purification device.
- Fig. 15 (a) is a bottom view of the electrically heated catalyst device 10G
- Fig. 15 (b) is a V_V cross section of Fig. 15 (a).
- Fig. 15 (c) is a section B of Fig. 15 (a).
- Figure (d) is an enlarged side view of Figure (b)
- Figure (e) is a sectional view taken along the line VI-VI of Figure (d).
- the non-reinforced layer portion 7n of the honeycomb body 7 is in contact between the inner peripheral reinforcing layer 7i and the outer peripheral reinforcing layer 7o of the honeycomb body 7.
- Four traversing ceramic bars 41a, 41b, 41c, 41d are arranged in a cross shape.
- the ends of these ceramic bars placed on the inner peripheral reinforcing layer 7i are locked by U-shaped pins 42ai to 42di.
- the heads of these U-shaped pins fit and hold the ceramic bar, and the tips are inserted into the inner peripheral reinforcing layer 7 i of the honeycomb body 7 and brazed to the inner reinforcing layer wall.
- the end of the ceramic mix bar allows the shape of the honeycomb body 7 to change while preventing the metal foils from shifting.
- a locking groove 43 having a slight inclination is formed.
- FIGS. 16 (a) to 16 (e) show other examples of the arrangement of the ceramic bars in the above embodiment.
- FIG. 16 (a) shows the honeycomb body.
- an inner peripheral reinforcing layer 7i and an outer peripheral reinforcing layer ⁇ 0 are formed, and three ceramic bars 41e, 41f, 41g are interposed between the inner peripheral reinforcing layer ⁇ i and the outer peripheral reinforcing layer 7o.
- FIG. 3B shows that the inner peripheral reinforcing layer 7 i and the outer peripheral reinforcing layer 7 o are formed on the honeycomb body, and the two ceramic bars 41 h and 41 i are connected to the inner peripheral reinforcing layer 7 i and the outer peripheral reinforcing layer 7 i.
- the non-reinforced layer 7 n of the honeycomb body is generally traversed in a contact state between the reinforcing layers 70.
- the ceramic layers are arranged at an equal angle of 180 ° and two ceramic bars 41 j, 41 k is placed between the outer peripheral reinforcing layer ⁇ 0 and parallel to the non-reinforcing layer part 7 n of the honeycomb body so as to traverse it almost in contact with each other and symmetrically around the ceramic bar 41 h, 41 i If you have done it.
- FIG. 3 (c) shows that the outer peripheral reinforcing layer ⁇ 0 is formed on the honeycomb body 7, and two ceramic bars 41j, 41k are interposed between the outer peripheral reinforcing layer 70 and the non-reinforced layer part 7 of the honeycomb body. This is the case where n is arranged in parallel so as to traverse almost in a contact state.
- an outer peripheral reinforcing layer 7o is formed on the honeycomb body 7 and three ceramic bars 41m, 41m, 41 ⁇ are interposed between the outer peripheral reinforcing layer 70 and the non- This is a case in which the reinforcing layer 7 ⁇ is arranged in a triangular shape so as to traverse substantially in a contact state.
- the non-reinforced layer portion of the honeycomb body is firmly held through the center electrode and the ceramic bar disposed between the reinforced eyebrows of the honeycomb body joined to the casing.
- the current does not bypass the ceramic bar, and does not hinder the heat generation in the current path of the honeycomb body.
- the ceramic bar is held by the reinforcing layer formed on the honeycomb body, and is in contact with the honeycomb body, but is not fixed by bonding or the like, so that a flexible holding structure against thermal expansion is formed. It will not be damaged. As a result, there is no concern that the honeycomb body is displaced in the flow direction and the radial direction of the exhaust gas, and the honeycomb body is securely held by the metal outer cylinder, and the durability of the electrically heated catalyst carrier can be improved.
- an electric introduction part was provided in the metal outer cylinder on the exhaust upstream side of the electric heating type catalyst carrier to form an electric heating type catalyst device, and the main catalyst device was brought close to this catalyst device via a ceramics bar. An embodiment arranged at the position will be described.
- FIG. 17 is a cross-sectional front view of an exhaust gas purifying apparatus 60A for an internal combustion engine having the electrically heated catalyst device 10H of the above embodiment of the present invention.
- the exhaust gas purification device 60A includes an electrically heated catalyst device 10H and a main catalyst device 40A.
- a honeycomb body 7 composed of the corrugated foil 4 and the flat foil 5 described in FIGS. 30 (a) and (b) is inserted into a metal outer cylinder 1.
- a central electrode 6 is provided at the center of the honeycomb body 7, and the central electrode 6 penetrates a holder 8C provided on the outer peripheral surface of the outer cylinder 11 by a lead portion 6A. It is connected to the.
- FIG. 18 shows details of the structure of the battery body 7, the electrode portion 8A, the holder 8C, and the outer cylinder 11.
- the ceramic bars 45a and 45b which are insulating retainers, are provided on the end face of the honeycomb body 7 downstream of the flow of exhaust gas (downstream of exhaust gas) so as to cross the honeycomb body 7. Is placed.
- the ceramic bars 45a and 45b are connected to the honeycomb body 7 by inserting both ends of U-shaped pins 47a and 47b made of a heat-resistant metal into the honeycomb body 7 from the exhaust downstream side. It is attached to the side end surface.
- the both ends of the pins 45a and 45b inserted in the honeycomb body 7 may be fixed to the honeycomb body 7 with a port member or the like.
- the end faces of the ceramic bar 45a, 45b attached to the honeycomb body 7 by the pins 47a, 47b on the exhaust downstream side are provided with the recesses 46a, 46b at the positions where the pins 47a, 47b are attached. b is provided.
- the shape of the recesses 46a and 46b may be a circumferential surface when the pins 47a and 47b are U-shaped as shown in FIG.
- FIG. 19 shows a partially enlarged cross section taken along line VE-VII of FIG. 17, and illustrates the detailed shape of the concave portion 46a.
- the depth L1 of the recess 46a provided at the mounting position of the pin 47a of the ceramic bar 45a is larger than the thickness N of the pin 47a.
- the metal cylinders 1a at both ends of the ceramic mix bar 45a The length is such that a metal outer cylinder 48 of a main catalyst device 40A, which will be described later, can be inserted into the space between the two.
- the outer diameter of the metal outer tube 48 of the main catalyst device 40A is formed to be equal to the inner diameter of the metal outer tube 1 of the electrically heated catalyst device 10H.
- the height of the metal outer cylinder 48 protruding from the end surface of the main catalyst carrier 3 on the exhaust upstream side of the main catalyst device 40A is set to be lower than the height H of the ceramic bar 45a shown in FIG. Is formed in
- the outer peripheral surface of the outer cylinder 48 of the main catalyst device 40A is fitted into the inner peripheral surface of the metal outer cylinder 1 of the electrically heated catalyst device 10H assembled as shown in FIG.
- the exhaust as shown in FIG. A purification device 60A is configured. In this state, the honeycomb body 7 of the electrically heated catalyst device 10 H and the main catalyst carrier 3 of the main catalyst device 40 A are in an insulated state.
- the honeycomb structure 7 of the electrically heated catalyst device 10H is attached to the main catalyst device 40A. Since the main catalyst carrier 3 can be brought close to the main catalyst carrier 3 in an insulated state, the warming property of the main catalyst carrier 4 of the main catalyst device 40A is improved. Then, since the main catalyst carrier 3 of the main catalyst device 40A bears the force acting on the ceramic mix bars 45a and 45b in the exhaust gas flow direction, the ceramic mix bars 45 and 46 are attached to the honeycomb body 7.
- the pins 47a and 47b need only prevent lateral displacement of the ceramic bars 45a and 45b, and the diameter can be reduced. As a result, the heat capacity of the pins 47a and 47b can be reduced, and the warm-up property of the main catalyst carrier 3 does not deteriorate.
- FIG. 20 is a cross-sectional front view showing a configuration of an exhaust gas purification device 60B obtained by modifying the exhaust gas purification device 60A of the embodiment shown in FIG. Exhaust gas purification of modified embodiment
- the configuration of the gasification device 60B is almost the same as the configuration of the exhaust gas purification device 60A of the embodiment shown in FIG. Therefore, the same components as those of the exhaust gas purification apparatus 60A of the embodiment shown in FIG. 17 are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.
- the inner diameter of the metal outer tube 48 of the main catalyst device 40B is formed to be equal to the outer diameter of the metal outer tube 1 of the electrically heated catalyst device 10I. Then, the height of the metal outer cylinder 1 protruding from the end face of the honeycomb body 7 on the downstream side of the exhaust of the electrically heated catalyst device 10 I becomes lower than the height H of the ceramic mix bar 45 a shown in FIG. It is formed as follows.
- the inner peripheral surface of the metal outer cylinder 48 of the main catalyst device 40B is fitted into the outer peripheral surface of the metal outer cylinder 1 of the electric heating type catalyst device 10I assembled as shown in FIG.
- the main catalyst carrier 3 of the device 40B is inserted until it comes into contact with the ceramic bar 45a, 45b attached to the end face on the downstream side of the exhaust of the electrically heated catalyst 10I, the exhaust as shown in FIG.
- the cleaning device 60B is configured. In this state, the honeycomb body 7 of the electrically heated catalyst device 10I and the main catalyst carrier 3 of the main catalyst device 40B are in an insulated state.
- the exhaust gas purifying apparatus 60B shown in FIG. 20 differs only in how the main catalyst device 40B is attached to the electric heating type catalytic device 10I, and other functions are shown in FIGS. 17 to 19. This is the same as the exhaust gas purifying device 60 A of the described embodiment.
- FIG. 21 is a side sectional view showing the structure of an exhaust gas purifying apparatus 60C for an internal combustion engine according to another embodiment of the present invention.
- the ceramic heating bars 45a, 45b and the power heating pins 47a, 47b are used to control the electric heating type catalytic converter 10H. Attached to the end face of the honeycomb body 7 on the exhaust downstream side However, in the exhaust gas purifying apparatus 60C of this embodiment, the ceramic mixers -49a and 49b are attached to the end face of the main catalyst carrier 40C on the exhaust upstream side of the main catalyst carrier 3 by the pins 47a and 47b. I have. Except for this point, it is completely the same as the exhaust purification device 10H of the embodiment in FIG.
- FIG. 22 shows a configuration of an exhaust gas purification device 60D of a modified embodiment of the exhaust gas purification device 60C of the embodiment shown in FIG.
- the inner peripheral surface of the metal outer tube 48 of the main catalyst device 40D is attached to the outer peripheral surface of the metal outer tube 1 of the electrically heated catalyst device 10K.
- Other functions are the same as those of the exhaust purification device 60C of the embodiment described with reference to FIG.
- FIGS. 23 (a) to 23 (d) show modified examples of the pins 47a, 47b which can be used in the exhaust gas purifying apparatuses 60A, 60B, 60C, 60D of the embodiment described above.
- the attachment portion of the pin 47 to the honeycomb body 7 or the main catalyst carrier 3 is a wavy portion 51a.
- an arrow blade-shaped projection 51b is provided on a mounting portion of the pin 47.
- the pin 47 shown in the figure (c) has a J-shape rather than a U-shape.
- two bulging portions 51c are formed at a part of a portion where the pin 47 is attached to the honeycomb body 7 or the main catalyst carrier 3.
- the pin 47 shown in the figure (d) is not U-shaped but L-shaped.
- the shape of the concave portions 46, 50 provided in the ceramic bars 45, 49 may be rectangular grooves.
- a part of the attachment portion of the pin 47 to the honeycomb body 7 or the main catalyst carrier 3 is bulged in a truncated cone shape to form a truncated cone portion 51d.
- FIG. 24 is a cross-sectional front view showing the configuration of an exhaust emission control device 10E according to another embodiment of the present invention.
- the configuration of the exhaust gas purifier 10E of this embodiment is almost the same as the configuration of the exhaust gas purifier 10H of the embodiment shown in FIG. 17, except for the shape of the ceramic bar 52a, 52b and the pin 54a. , 54b only.
- through holes 53 a and 53 b are formed in the ceramic mixer 52 a arranged so as to cross the exhaust downstream end face of the honeycomb body 7. Is provided.
- the pins 54a and 54b have a rod shape.
- the inner diameter of the through hole 53a is formed to be slightly larger (including the thermal expansion allowance of the pin) than the outer diameter of the pin 54a, and the pin 54a fixed in the honeycomb body is fitted into the through hole 53a. Then, the ceramic bar 52a is not easily pulled out by being pressed against the main catalyst carrier 3.
- the free end of the pin 54a inserted into the honeycomb body 7 is fixed to the honeycomb body 7 with a brazing material or the like.
- FIG. 25 (b) shows a partially enlarged cross section of the coral-cored line in FIG. 24, and explains the mounting relationship between the through-hole 53a and the pin 54a.
- the pin 54a is inserted into the through hole 53a formed at the mounting position of the pin 54a of the ceramic bar 52a, and the exhaust downstream of the ceramic bar 52a. It is fitted with the height L2 floating from the side end face. Since the pin 54a is inserted into the through hole 53a except for the height L2, it is impossible for the tip of the pin 54a on the exhaust downstream side to protrude from the end face on the exhaust downstream side of the ceramic bar 52a. Absent.
- the other configuration of the exhaust gas purification device 60E is the same as that of the exhaust gas purification device 60A of the embodiment shown in FIG. 17, so that the exhaust gas purification device 60E of the embodiment assembled as shown in FIG. Since the main catalyst carrier 3 of the main catalyst device 40 E can be brought close to the honeycomb body 7 of the electrically heated catalyst device 10 L in an insulated state, the main catalyst carrier of the main catalyst device 40 E 3. Warmability is improved. Since the pins 54a and 54b holding the ceramic bars 52a and 52b are rod-shaped, the heat capacity of the pins 54a and 54b can be further reduced, and the warm-up property of the main catalyst carrier 3 deteriorates. I won't let you.
- the inner diameter of the outer tube 48 of the main catalyst device 40E is formed to be equal to the outer diameter of the metal outer tube 1 of the electrically heated catalyst device 10L. It is also possible to adopt a configuration in which the inner peripheral surface of the metal outer cylinder 48 of the main catalyst device 40E is fitted to the outer peripheral surface of the metal outer cylinder 1 of the device 10L.
- FIG. 26 is a side sectional view showing the configuration of an exhaust gas purifying apparatus 60F according to another embodiment of the present invention.
- the ceramic bars 55a and 55b are attached to the exhaust upstream end surface of the main catalyst carrier 3 of the main catalytic device 40F by pins 54a and 54b.
- the other configuration is exactly the same as that of the exhaust purification device 60E of the embodiment shown in FIG.
- the inner diameter of the metal outer cylinder 48 of the main catalytic converter 40F is formed to be equal to the outer diameter of the metal outer cylinder 1 of the electrically heated catalytic converter 10M.
- a configuration in which the inner peripheral surface of the metal outer cylinder 48 of the main catalytic device 40F is fitted to the outer peripheral surface of the metal outer cylinder 1 of the electrically heated catalyst device 10M is also possible.
- FIGS. 27 (a) to 27 (d) show modified embodiments of the pin 54 which can be used in the exhaust gas purifying apparatuses 10L and 10M of the embodiment described above.
- the attachment portion of the pin 54 to the honeycomb body 7 or the main catalyst carrier 3 is a wavy portion 55a.
- an arrow-shaped projection 55b is provided on the mounting portion of the pin 54.
- a bulged portion 55c is formed at a part of the portion where the pin 54 is attached to the honeycomb body 7 or the main catalyst carrier 3. It is formed in two places.
- a part of the mounting portion of the pin 54 to the honeycomb body 7 or the main catalyst carrier 3 is expanded in a truncated cone shape to form a truncated cone portion 55d. Due to the shape of the tips of the pins described above, when the pins 54 are inserted into the honeycomb body 7 or the main catalyst carrier 3, the pins 54 do not easily come off, and these pins can be fixed to the metal foil with a small brazing amount.
- FIG. 28 is an assembled perspective view showing still another modified embodiment of the ceramic mixer 57 and the pin 59 which can be used in the exhaust emission control devices 60E and 60F.
- a rectangular hole 57a is provided at one end of a through hole 57b provided in the ceramic bar 57.
- a horizontal bar 59a that can be accommodated in the rectangular hole 57a is provided, and the entire shape of the pin 59 is T-shaped.
- the depth of the rectangular hole 57a needs to be formed larger than the diameter of the pin 59a of the pin 59, and the horizontal bar 59a of the pin 59 is accommodated in the rectangular hole 57a.
- the horizontal rail 59a of the pin 59 does not protrude from the surface of the ceramic bar 57.
- the various embodiments of the various bar-shaped pins 47, 54, and 59 have been described above. The force is not limited to these examples.
- the distance between the exhaust downstream end face of the electrically heated catalyst carrier and the exhaust upstream end face of the main catalyst carrier is 1 to 50 mn, preferably 5 mn! It is extremely effective to set the interval to 50 mm.
- the interval of 50 bandages is limited to the exhaust gas warmed by the electrically heated catalyst carrier. Is the upper limit value of the interval that does not impair the warming property of the main catalyst.
- the electric heating type catalytic device accommodating the honeycomb body 7 formed by spirally winding a laminated metal foil obtained by laminating the corrugated foil 4 and the flat foil 5 was described.
- the honeycomb body 7 can be formed without spirally winding the laminated metal foil, or can be formed by bending the laminated metal foil in a zigzag shape into a columnar shape.
- the ceramic bar and the ring-shaped holding member or the pin of the present invention can also be effectively applied to an electrically heated catalyst device containing a honeycomb body.
- a band-shaped metal foil body 7A in which a corrugated foil 4 and a flat foil 5 are overlapped is folded.
- the laminate is laminated to form a laminated body 7A, and the laminated body is filled into a slit holder 60 with a slit 61, and a turning point of the band is inserted and fixed in the slit to form a honeycomb body. And insert it into the metal outer cylinder.
- the electric lead-in section passes lead wires through the holes 62 and 63 provided in the slit holder, connects this lead wire to both ends of the strip 7A, and connects the lead wire to an external battery. It is configured.
- the honeycomb body support member is formed of an insulating ceramic bar
- the current is bypassed to the ceramic bar. It does not hinder heat generation in the current path of the honeycomb body.
- the ceramic bar is in contact with the honeycomb body, but is fixed to the reinforcing layer of the honeycomb body with a pin, or is simply held by a ring-shaped holding member joined to the metal outer cylinder. Since it is not bonded to electrodes, etc., it forms a honeycomb body holding structure that is flexible against thermal expansion, and is not damaged by the difference in thermal expansion.
- the reinforcing layers formed on the honeycomb body for the arrangement of the ceramic bar are an inner peripheral reinforcing layer and an outer peripheral reinforcing layer or an outer peripheral reinforcing layer, but this reinforcing layer is formed intermittently. You may.
- the ceramic bar has an insulating property, and has a heat resistance, a heat shock resistance, and an oxidation resistance in a temperature range up to 1000 ° C, for example, an oxide material mainly composed of silicon nitride / alumina. It is preferable to form with the ceramic of the following.
- At least the supporting portion of the honeycomb body is preferably a thin rod-shaped body, and a plurality of rod-shaped bodies may be integrally formed.
- the inner peripheral portion reinforcing layer may be fixed to the inner peripheral portion reinforcing layer via a pin or may be joined to the center electrode portion. It is preferable that the fixing is performed via a pin from the viewpoint of absorbing the difference in thermal expansion.
- the pin that holds the ceramic bar to the honeycomb body may be non-insulating, but, like the insulating ceramic bar, it has a heat-resistant, oxidation-resistant material and F at temperatures up to 1000 ° C. It is preferable to use e-Cr-based stainless steel, Fe-Cr-A1-based stainless steel, Fe-Cr-Ni-A1-based stainless steel, or Inconel.
- the shape may be any shape as long as the ceramic bar can be engaged with the honeycomb body, such as a U-shape as shown in the embodiment, a T-shape head or a shape without a head.
- General pin shapes work well.
- the tip of this pin is the inner circumference of the honeycomb body It is inserted into the reinforcing layer formed on the outer peripheral portion and the outer peripheral portion, and is brazed.
- the ceramic bar and the pin are not joined from the viewpoint of preventing damage due to a difference in thermal expansion between the ceramic bar and the honeycomb body.
- this holding member When the tip of the ceramic bar is supported by a ring-shaped holding member, this holding member should be formed of a material that can be easily welded or brazed to the metal outer cylinder from the viewpoint of easy joining to the metal outer cylinder. It is preferable that at least one of the ring-shaped holding member and the ceramic bar has a structure in which an engagement groove is provided so as to prevent the tip of the ceramic bar from slipping or falling off. I like it.
- the ring-shaped holding member is provided in a ring shape or a shape similar thereto, or in a shape that supports only the vicinity of the tip of the ceramics bar.
- the electric heating type catalytic device using the electric heating type metal catalyst carrier of the present invention shown in Fig. 11 (c) is mounted directly below the exhaust manifold of a 2000 CC engine, and the exhaust gas temperature is 100 to 900 °.
- a heat cycle test of C was conducted, and a heating test was conducted before and after the structural durability of the honeycomb body and the heat cycle test.
- a ceramic bar is arranged to support a honeycomb body.
- this ceramic bar is a 1.5 to 3 mm square section made of a gay nitride-based ceramic, and the ring-shaped holding member is made of a flat stainless steel. A ring-shaped holding member and a metal outer cylinder were joined by welding with a thickness of 1.5 mm.
- the conventional example is a case where no ceramic bar is provided.
- Corrugated foil (Material is ferrite stainless steel)
- Width 20mm. Thickness: 0.05 Lord, Wave height: 1.25mm, Wave pitch: 2.5mm Flat foil (Material is stainless steel)
- Width 20mm
- Thickness 0.05mm
- Thickness 1.5 recitation
- the honeycomb body supporting member is formed of an insulating ceramic bar
- the honeycomb body when the honeycomb body is energized, the energized current does not bypass the ceramic bar and the current path of the honeycomb body does not pass. It does not hinder the fever of the car.
- the ceramic bar is held by a reinforcing layer formed in the honeycomb body, and It comes into contact with the two-cam body, but is held by the outer peripheral layer of the honeycomb body via pins and, if necessary, by the reinforcing layer, or is held by a ring-shaped holding member joined to the metal outer cylinder. Since it is not bonded to the honeycomb body and the electrodes, a honeycomb body holding structure that is flexible against thermal expansion is formed, and there is no breakage due to a difference in thermal expansion.
- the displacement of the honeycomb body can be reliably prevented, the durability of the electrically heated catalyst carrier can be improved, and its function can be stably maintained over a long period of time.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53637696A JP3405993B2 (ja) | 1995-05-30 | 1996-05-30 | 内燃機関の排気浄化装置 |
US08/776,679 US5902557A (en) | 1995-05-30 | 1996-05-30 | Device for purifying exhaust gas of internal combustion engine |
EP96920016A EP0775807B8 (en) | 1995-05-30 | 1996-05-30 | Exhaust emission control device for internal combustion engines |
DE69629269T DE69629269T2 (de) | 1995-05-30 | 1996-05-30 | Abgaskontrollvorrichtung für brennkraftmaschine |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13159895 | 1995-05-30 | ||
JP7/131598 | 1995-05-30 | ||
JP8/55963 | 1996-03-13 | ||
JP5596396 | 1996-03-13 | ||
JP8/57521 | 1996-03-14 | ||
JP5752196 | 1996-03-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996038657A1 true WO1996038657A1 (fr) | 1996-12-05 |
Family
ID=27295756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/001474 WO1996038657A1 (fr) | 1995-05-30 | 1996-05-30 | Dispositif de controle de l'emission de polluants dans les gaz d'echappement pour moteurs a combustion interne |
Country Status (5)
Country | Link |
---|---|
US (1) | US5902557A (ja) |
EP (1) | EP0775807B8 (ja) |
JP (1) | JP3405993B2 (ja) |
DE (1) | DE69629269T2 (ja) |
WO (1) | WO1996038657A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0789136A1 (en) * | 1996-02-06 | 1997-08-13 | Toyota Jidosha Kabushiki Kaisha | Structure for supporting honeycomb unit of electrically-heated catalyst apparatus |
JP2006099968A (ja) * | 2004-09-28 | 2006-04-13 | Showa Aircraft Ind Co Ltd | ハニカムヒーター |
CN114981525A (zh) * | 2020-08-28 | 2022-08-30 | Hjs排放技术两合公司 | 电气的加热装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7163666B2 (en) | 2000-11-13 | 2007-01-16 | Kawasaki Jukogyo Kabushiki Kaisha | Thermally tolerant support structure for a catalytic combustion catalyst |
JP2003200062A (ja) * | 2001-10-26 | 2003-07-15 | Denso Corp | 車両用触媒 |
US20110072805A1 (en) * | 2009-09-25 | 2011-03-31 | International Engine Intellectual Property Company Llc | Electrically heated diesel oxidation catalyst |
DE102014003686A1 (de) * | 2014-03-14 | 2015-09-17 | Daimler Ag | Abgasnachbehandlungseinrichtung, Abgasnachbehandlungssystem, Brennkraftmaschine und Kraftfahrzeug |
JP6131980B2 (ja) * | 2015-03-27 | 2017-05-24 | トヨタ自動車株式会社 | 電気加熱式触媒コンバーター |
KR20210071578A (ko) * | 2019-12-06 | 2021-06-16 | 현대자동차주식회사 | 차량용 촉매 컨버터 |
DE102020210889A1 (de) * | 2020-08-28 | 2022-03-03 | Vitesco Technologies GmbH | Elektrische Durchführung |
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- 1996-05-30 DE DE69629269T patent/DE69629269T2/de not_active Expired - Fee Related
- 1996-05-30 JP JP53637696A patent/JP3405993B2/ja not_active Expired - Fee Related
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0789136A1 (en) * | 1996-02-06 | 1997-08-13 | Toyota Jidosha Kabushiki Kaisha | Structure for supporting honeycomb unit of electrically-heated catalyst apparatus |
US5866077A (en) * | 1996-02-06 | 1999-02-02 | Toyota Jidosha Kabushiki Kaisha | Structure for supporting honeycomb unit of electrically-heated catalyst apparatus |
JP2006099968A (ja) * | 2004-09-28 | 2006-04-13 | Showa Aircraft Ind Co Ltd | ハニカムヒーター |
CN114981525A (zh) * | 2020-08-28 | 2022-08-30 | Hjs排放技术两合公司 | 电气的加热装置 |
CN114981525B (zh) * | 2020-08-28 | 2024-04-09 | Hjs排放技术两合公司 | 电气的加热装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0775807A4 (en) | 1999-01-13 |
EP0775807A1 (en) | 1997-05-28 |
JP3405993B2 (ja) | 2003-05-12 |
EP0775807B1 (en) | 2003-07-30 |
DE69629269D1 (de) | 2003-09-04 |
US5902557A (en) | 1999-05-11 |
DE69629269T2 (de) | 2004-07-01 |
EP0775807B8 (en) | 2003-11-05 |
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