JPH09192499A - Metal carrier for electrically-heated catalytic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the telescoping of a rolled electrically-heated first honeycomb body arranged on the upstream side of a rolled second honeycomb body forming a metal carrier for an electrically-heated catalytic device in series, having an unbonded electrical insulating corrugaged sheet and short in the axial direction. SOLUTION: A rolled honeycomb stopper assembly 13 is provided in the space C between the second honeycomb body 12 and electrically-heated first honeycomb body 11 arranged in series, and the telescoping of the first honeycomb body 11 is suppressed by the second honeycomb body 12. Since the second honeycomb body 12 is long in the axial direction, telescoping is not caused. The stopper assembly 13 is formed by rolling the laminate of a thin metallic flat sheet and a corrugated sheet, and an electrical insulating coating film layer is provided at least on the end face 13a abutting on the first honeycomb body 11. The density of the reticular air passage of the assembly 13 is made equal to or lower than that of the first honeycomb body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst carrier metal carrier used in an exhaust gas purifying apparatus for an internal combustion engine, and more particularly to an electrically heated catalyst carrier metal carrier.

[0002]

2. Description of the Related Art A metal carrier for a catalyst device used in a conventional exhaust gas purifying apparatus has a brazing filler metal interposed between a thin metal flat plate and a corrugated plate, and the flat plate and the corrugated plate are superposed and rolled into a roll from the center. A honeycomb body is formed, a brazing material is melted using a high vacuum furnace, and joining is performed at a contact portion of the plate materials. A Ni-based brazing material was used as the brazing material, and a ferritic stainless steel material was used as the flat plate and the corrugated plate. A honeycomb carrier formed in such a manner and housed in a metal outer cylinder is known as a metal carrier for a catalyst device (for example, JP-A-65-4373).

[0003] A catalyst carrying layer is formed on the surface of the honeycomb passage of the honeycomb body, and the noble metal catalyst is carried on the catalyst carrying layer to serve as an exhaust gas purifying catalyst. HC, CO, and NOx contained in the exhaust gas are provided in the exhaust passage of the internal combustion engine.
Etc. Since it is necessary to secure as large a honeycomb passage area as possible in a limited volume, the thickness of the flat plate and the corrugated plate is made as thin as possible within a range where strength can be maintained.

Since the catalytic reaction of the noble metal catalyst supported on the catalyst supporting layer described above is promoted in a high temperature environment to some extent, the exhaust gas of the internal combustion engine is exhausted so that the catalytic device is exposed to the exhaust gas at a temperature as high as possible. It is provided near the.

Further, the flow velocity of the exhaust gas passing through the honeycomb body is higher from the outer layer portion to the inner layer portion of the honeycomb body,
Therefore, in the honeycomb body, due to contact with high-temperature exhaust gas, heat generation due to catalytic reaction, and heat dissipation from the outer cylinder, a temperature distribution is generated in which the inner layer portion is hotter and the outer layer portion is colder.
Due to this temperature distribution, the expansion / contraction amount of the inner layer portion of the high temperature honeycomb body becomes larger than the expansion / contraction amount of the outer layer portion of the low temperature, so that thermal stress is generated between the inner layer portion and the outer layer portion. . This thermal stress is repeated every time the honeycomb body expands and contracts, but in the conventional metal carrier for a catalyst device,
Since all flat plates and corrugated sheets are brazed together via brazing filler metal, thermal stress cannot be released, and the joints between flat sheets and corrugated sheets are broken after long-term use. There is.

In order to eliminate this defect, two or more flat plates forming the honeycomb body are stacked, and the flat plates are simply stacked without being joined, and a second corrugated plate is further placed between the two flat plates. Disclosed is a metal carrier which is disposed without being joined and between which flat plates are not joined and between the flat plate and the second corrugated plate are freely slid to relax thermal stress.

However, in such a metal carrier for a catalyst device, the catalyst reaction is not sufficiently performed because the temperature of the exhaust gas is low at the time of starting the internal combustion engine, so that HC, CO, NOx, etc. in the exhaust gas are purified. Inadequate ability. In order to eliminate this drawback, various metal carriers for electrically heated catalyst devices have been disclosed, and the metal carriers are electrically heated at the time of starting to promote the catalytic reaction.

As described above, in the honeycomb body of the type in which a plurality of flat plates and the second corrugated plate are inserted between the flat plates, a coating layer of aluminum oxide or the like is formed on the surface of the second corrugated plate. , Electrically insulating between the layers wound in a roll shape of the honeycomb body, and providing electrodes for connecting to the power source at the ends of the plate material at the beginning and end of the winding of the honeycomb body, respectively. A method of passing an electric current in the winding direction is adopted. In such an electrically heated metal carrier for heating the entire honeycomb body, the shorter the axial length is, the shorter the heating time to the required temperature is for the same power consumption when the outer shape is the same.

Therefore, a metal carrier having a large capacity,
In the electric heating type metal carrier which has a small capacity but is effective for electric heating with less power consumption, a honeycomb body in the metal carrier 30 is divided into two as shown in FIG. A first metal carrier 31 having an appropriate capacity,
It is disclosed that a second metal carrier 32 forming a main metal carrier that does not include a heating portion is arranged in series.

In FIG. 4, when the capacity of the first metal carrier 31 is small and the axial length thereof is short, for example, 20 mm or less, the first metal carrier 31 is insulated from the insulating corrugated plate. Because of the layers, the insulating corrugated sheet is not joined by the brazing material, and further, because the thermal stress is also released between the flat plates, the joining is not normally performed, so the layers are displaced during use, so-called telescoping. There is a drawback that In order to prevent this phenomenon, as shown in FIG. 5, the central electrode 26 provided in the central portion of the electrically heated first honeycomb body 21 is extended and charged into the central portion of the second honeycomb body 22. However, the central portion of the first honeycomb body 21 and the central portion of the second honeycomb body 22 are joined together to prevent telescoping.

[0011]

In the method for preventing telescoping of the first honeycomb body by extending the center electrode of the central portion of the first honeycomb body and bonding it to the second honeycomb body, A part of the honeycomb body 1 fixed in the axial direction is only a part close to the center electrode and a part close to the outer cylinder, and the other parts are not sufficiently fixed, so that telescoping cannot be completely prevented. In addition, since the positions of the central portions of the first and second honeycomb bodies are different in the respective honeycomb bodies, the first honeycomb is heated during heating in order to perform unreasonable centering when charging the holding cylinder. It has the drawback of deforming the body. Further, in the second honeycomb body which is not electrically heated, there is a drawback that the structure becomes complicated because it is necessary to consider insulation.

An object of the present invention is to prevent telescoping of an electrically heated metal carrier which has a short axial length and tends to cause telescoping.

[0013]

MEANS FOR SOLVING THE PROBLEMS The metal carrier for an electrically heated catalyst device of the present invention comprises a corrugated sheet material formed by bending a thin metal sheet in the form of a strip to form continuous corrugation, and a flat corrugated sheet material. An insulating corrugated plate having a plurality of flat plate members made of thin metal plates in a belt shape and abutting on each other, and having an electrically insulating coating layer between two adjacent flat plate members. Are arranged without being joined, and form a honeycomb body provided with a large number of mesh-like ventilation passages formed by being wound in a roll shape, and the layers wound in a roll shape of the honeycomb body are electrically insulated from each other. A first honeycomb body having a short axial length and having a central electrode in the central portion of the honeycomb body and an outer peripheral electrode opposite to the central electrode in the outer peripheral portion of the honeycomb body; A corrugated sheet material that is bent to form a continuous corrugated surface and a flat strip A plate material made to a thin metal plate overlap in contact with each other, forms a honeycomb body having a large number of mesh-like air passage is formed is wound into a roll,
An electric machine including a second honeycomb body arranged in series at a distance downstream of the first honeycomb body, and a holding cylinder that covers the first and second honeycomb bodies and holds both the honeycomb bodies. In a metal carrier for a heating-type catalyst device, the honeycomb carrier is arranged in a predetermined space between a first honeycomb body and a second honeycomb body and is held by a holding cylinder, and both end faces of the honeycomb body facing each other in an axial direction are contacted with each other. A stopper assembly for preventing the first honeycomb body from moving axially in the direction of the second honeycomb body, which is electrically insulated at least in contact with the first honeycomb body. have.

In the stopper assembly described above, a corrugated sheet material in which a strip-shaped thin metal plate is bent to form continuous corrugated irregularities, and a flat sheet material made of a flat strip-shaped thin metal plate are provided.
A honeycomb body is provided which has a plurality of mesh-shaped ventilation passages formed by being wound in a roll shape so as to be in contact with each other and overlapped with each other, and a honeycomb body having an axial length equal to a predetermined interval is formed. And a rectangular shape having long sides in contact with the opposite end surfaces of the second honeycomb body and short sides inscribed in the holding cylinder,
A plurality of flat plates made of thin metal plates and rectangular flat plates are connected to each other to hold the flat plates perpendicularly to opposite end faces of the first and second honeycomb bodies, and are arranged substantially concentric with the central axis. It is formed by including at least one cylinder made of a thin metal plate.

The density of the mesh-like ventilation passages of the stopper assembly forming the honeycomb body is preferably equal to or lower than the density of the mesh-like ventilation passages of the first honeycomb body.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The metal carrier for an electrically heated catalyst device of the present invention comprises a corrugated sheet material formed of a narrow metal plate and a plurality of flat sheet materials, and a plurality of flat sheets. An insulating corrugated sheet having an electric insulating coating layer is provided between two adjacent sheets of the material without being joined and wound in a roll shape to form a honeycomb body having a short axial length. Forming a first honeycomb body that can be electrically heated by providing electrodes at the beginning and the end of winding of the roll, and stacking another corrugated plate material and a flat plate material on each other to form a second honeycomb body Form a body, in series downstream of the first honeycomb body,
The first and second honeycomb bodies and the stoppers are arranged at predetermined intervals, and one stopper assembly that abuts against the end portions of the two honeycomb bodies facing each other is arranged within the predetermined space. The assembly is formed by being housed in a retaining tube having an inner diameter equal to their outer diameter.

Since the second honeycomb body is the main carrier for supporting the catalyst, it usually has a length in the axial direction larger than the outer diameter, so that telescoping does not occur downstream in the axial direction due to the gas flow. Very few. On the contrary, the first honeycomb body is an electric heating type honeycomb body as described above, and since it is necessary to perform effective electric heating with less power consumption, the axial length is extremely shorter than the outer diameter. Then
Furthermore, in the flat plate multiple structure having a plurality of flat plate members that are not joined to each other, or in the axial direction of the plate members such as a honeycomb body having a multilayer structure formed by stacking two or more layers in which flat plate members and corrugated plate members are stacked. Since the binding force is extremely small, telescoping due to the gas flow is likely to occur.

The above-mentioned stopper assembly according to the present invention is arranged within a predetermined space between the first honeycomb body and the second honeycomb body, and abuts against the opposing end faces of both honeycomb bodies to hold the holding cylinder. Since the first honeycomb body is telescoped toward the second honeycomb body by the gas flow, this can be prevented.

The structure of the stopper assembly according to the present invention is as follows: The honeycomb structure is formed by stacking a corrugated sheet material and a flat sheet material and winding them in a roll shape. The honeycomb structure has the same outer diameter as that of the first and second honeycomb bodies, and has the first and second axial lengths. It is the same as the predetermined spacing between the honeycomb bodies, and the first
And an electric insulating layer is formed on at least a portion of the end face that is in contact with the opposing end faces of the second honeycomb body and that is in contact with the first honeycomb body, or A plurality of flat plates made of a rectangular thin metal plate having long sides that abut on opposite end surfaces of the first and second honeycomb bodies and short sides that are inscribed in the holding cylinder, and these flat plates are connected to each other. It is formed by including at least one cylinder that holds the flat plate perpendicularly to the opposite end faces of the first and second honeycomb bodies and that is arranged coaxially with the central axis.

The above-mentioned stopper assembly preferably has as low a ventilation resistance as possible to the gas flow, and the density of the mesh-like ventilation passages of the stopper assembly forming the honeycomb body is equal to the density of the first honeycomb body. Or less.

Further, since the metal carrier according to the present invention has the above-mentioned structure, the structure of the electrically heated first honeycomb body is a flat plate multiple structure having a plurality of flat plate members which are not joined to each other, or two layers. Telescoping does not occur even when the axial restraining force of the plate material is extremely small as in the case of a multilayer structure formed by stacking the above layers.

Therefore, in designing the power consumption of the first honeycomb body, a relatively large power consumption increase / decrease is performed by increasing / decreasing the number of layers to be stacked in the multilayer structure and further increasing / decreasing the total length of the plate material of each layer. In addition, since it is possible to increase and decrease the power consumption in the flat plate multiplex structure by changing the number of flat plates, it is possible to provide a honeycomb body that meets the more detailed power consumption needs of customers by combining these. Can be done.

In the stopper assembly made of a conductive metal material, it is necessary to apply an electrically insulating coating layer to at least a portion of the stopper assembly which comes into contact with the electrically heated first honeycomb body. There are the following methods for applying the electrically insulating coating layer to the stopper assembly. That is, a. Physical methods (PVD) such as vacuum deposition, sputtering,
Insulation coating by ion plating, b. Coating an insulating film by a chemical method (CVD), c. A material that changes to an insulating coating layer by atmospheric baking, such as aluminum, and then baked in air, d. A stainless steel containing aluminum is used as a base material of the corrugated plate or the stopper assembly, and after forming, it is baked in air or after brazing is baked in air to deposit an aluminum oxide film. After being formed or after brazing, it is immersed in molten aluminum, and during the immersion, aluminum (Al) and iron (Fe) in the base material are mutually diffused to form an alloy layer on the surface, and then air baking is performed. Then, the aluminum oxide film is deposited.

[0024]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 (A) is a schematic cross-sectional view including a shaft of an embodiment of a metal carrier for an electrically heated catalyst device of the present invention, FIG. 1 (B).
Is a perspective view of the appearance of a stopper assembly that forms a roll-shaped honeycomb body, and FIG. 1C is a schematic cross-sectional view showing the configuration of the plate material of the electrically heated first honeycomb body of FIG. .

In FIG. 1A, the electrically heated metal carrier 10 for a catalytic device is provided with a first electrically heated honeycomb body 11 and a predetermined space C coaxially downstream of the first honeycomb body 11. The second honeycomb body 12 is arranged at a distance,
A stopper assembly 13 that is a roll-shaped honeycomb body is provided at a predetermined interval C. First honeycomb body 11
The outer surface of the second honeycomb body 12 is
It is covered with a and 12a, and is further inserted into a common holding cylinder 15 via an electric insulator 14.

The first honeycomb body 11 is shown in FIG. 1 (C).
A thin metal plate in the shape of a strip
One corrugated sheet material 1 with corrugated irregularities and a flat strip
One flat plate material 2 made of thin metal plate₁ Formed by and
Layer and one flat plate material 2_Two Fold a thin metal plate in the shape of a strip
Electrically insulative film that is bent to form continuous corrugations
Insulation corrugated sheet 3 having layers and layers formed by stacking
Flat plate material 2₁ , 2 _Two Between the insulating corrugated sheet 3 and the insulating corrugated sheet 3
It is formed by rolling in a roll without being joined by
I have. The central portion of the first honeycomb body 11 has a circular cross section.
The elongated rod-shaped center electrode 16 is arranged in the
And flat plate material 2₁ , 2_Two Is joined to the end of. First
Each roll-shaped layer of the honeycomb body 11 is formed by the insulating corrugated plate 3.
Since it is insulated, corrugated sheet material 1 and flat sheet material 2₁ , 2_Two 
To provide the outer peripheral electrode 17 at the end of the outer peripheral portion of the roll
Therefore, the plate material between the center electrode 16 and the outer peripheral electrode 17 is low.
Forming an electric resistor in the shape of a rod. Therefore, the center electrode 1
6 and the peripheral electrode 17 should be connected to a power source (not shown).
For example, the first honeycomb body 11 is a honeycomb that can be electrically heated.
Become a body.

Similar to the first honeycomb body 11, the second honeycomb body 12 is a honeycomb body formed by stacking a corrugated sheet material and a flat sheet material and winding them in a roll shape, but is not necessarily a flat plate double structure or It need not be a multi-layer structure. Also, no insulating corrugated sheet is provided. Since the second honeycomb body 12 serves as a main metal carrier for a catalyst device,
The axial length is longer than that of the first honeycomb body 11. Therefore, even if some of the plate materials are not joined by the brazing material, or even in the case of the flat plate double structure or the multilayer structure, telescoping does not occur.

The stopper assembly 13 is, like the second honeycomb body, a honeycomb body formed by stacking a corrugated plate material and a flat plate material and winding them in a roll shape, and brazing between the plate materials is not always necessary. do not do. The outer dimensions of the stopper assembly 13 are such that the diameter is inscribed in the insulator 14 or the holding cylinder 15, and the axial length is a predetermined length formed between the first honeycomb body 11 and the second honeycomb body 12. It is the same as the interval C.
Therefore, the stopper assembly 13 includes the axial end surface 13a,
Since 13b abuts on the opposite end faces of the first honeycomb body 11 and the second honeycomb body 12, respectively, the first honeycomb body 11 moves axially toward the second honeycomb body 12 by the gas flow. It is possible to prevent the occurrence of telescoping.

The dimension of the interval C between the first and second honeycomb bodies, that is, the axial length of the stopper assembly 13 is 2 in consideration of the insulation between both honeycomb bodies and the thermal efficiency as a heating type metal carrier. It is desirable to set it within a range of up to 30 mm.

Since the stopper assembly 13 forming the honeycomb body is made of an electrically conductive material such as iron or stainless steel, at least one end face 13a in contact with the electrically heated first honeycomb body 11 is electrically insulated. Need to be applied. When the stopper assembly alone is used as a method for electrical insulation, PVD, CVD or ion plating is used to coat aluminum oxide (Al ₂ O ₃ ) or another insulating coating layer, or aluminum is used. A stopper assembly is formed using the contained material or the material in which the alloy layer of iron and aluminum is formed by immersing it in molten aluminum, and the insulating coating layer is obtained by firing in the air.

The density of the mesh-like ventilation passages formed in the stopper assembly 13 forming the honeycomb body is such that the first honeycomb body 11
It is preferable to reduce the ventilation resistance as much as possible by setting the density to be equal to or less than the density of the mesh ventilation passage.

To dispose the first honeycomb body 11, the second honeycomb body 12 and the stopper assembly 13,
Although the holding cylinder 15 as shown in FIG. 2A is used, the method of using the holding cylinder 15 is as shown in FIGS.
There is one as shown in (C). In the embodiment shown in FIG. 2A, the outer cylinder of the first honeycomb body 11 is extended to cover the outer cylinder 12a of the second honeycomb body 12 to form the holding cylinder 15. In the example shown in B), the outer cylinder of the second honeycomb body 12 is extended to extend the first honeycomb body 11
The holding cylinder 15 is formed by covering the outer cylinder 11a. These holding cylinders 15 are fixed to the outer cylinders 12a or 11a by welding or the like. In the embodiment shown in FIG. 2C, the outer periphery of the stopper assembly 13 shown in FIG. 2B is held by an annular holder 18 made of an insulating material such as ceramic paper.

In order to carry the catalyst, it is possible to carry out simultaneously after the assembling of the first and second honeycomb bodies.
Various methods can be adopted, such as separately carrying the catalyst on the second honeycomb body so as to have different carrying specifications, or not carrying the catalyst on the first honeycomb body.

As a second embodiment of the present invention, various types of stopper assemblies 13 ₁ to 13 ₄ formed of a thin metal plate can be used as shown in FIG. In these stopper assemblies, a plurality of flat plates 2a made of a rectangular thin metal plate are connected to each other and the flat plates are connected to each other.
And a cylinder 4a arranged so as to be held perpendicularly to the opposing end faces of the second honeycomb body, are formed by being fixed by welding or the like. The cylinder 4a is made of a thin metal plate similar to the flat plate 2a, and is arranged so that the center axis of the cylinder 4a substantially coincides with the center axes of the first and second honeycomb bodies.

The stopper assembly 13 ₁ shown in FIG.
Is formed by welding both ends of four rectangular flat plates 2a that intersect each other at the same angle on the central axis on the inner surface of the cylinder 4a that can be inscribed in the holding cylinder 15 or the insulator 14. The stopper assembly 13 ₂ shown in FIG. 3 (B) is parallel to the central axis by joining both ends of four rectangular flat plates 2a having different lengths to the inner surface of the cylinder 4a by welding or the like. The stopper assembly 13 ₃ shown in FIG. 3 (C) is formed by holding the flat plate 2a used in FIG. Is formed by joining both ends of the flat plate 2a.
A stopper assembly 13 ₄ shown in FIG. 3D has four cylinders 4a having different diameters arranged concentrically to form one flat plate 2
It is formed by holding and bonding by a.

At least a portion of each stopper assembly of the above-mentioned second embodiment that abuts on the first honeycomb body 11 is subjected to an electrically insulating coating in the same manner as that described in the first embodiment. Apply layers.

It is also possible to form each stopper assembly having the same shape as that of the second embodiment shown in FIG. 3 described above by molding the sintered metal and then sintering it.

By providing the stopper assembly according to the present invention between the first and second honeycomb bodies, the occurrence of telescoping of the electrically heated first honeycomb body can be prevented. In addition to having a shape suitable for electrically heating the honeycomb body of, the axial length can be shortened to further meet the power consumption needs of customers.
A honeycomb body having a multilayer structure or a flat plate multiple structure can be freely adopted.

[0039]

As described above, according to the present invention, one corrugated plate member and a plurality of flat plate members are overlapped and adjacent to each other.
An electrically heated first corrugated sheet having a short axial length formed by arranging an insulating corrugated sheet with an electrically insulating coating without being joined between two flat plate materials and winding it in a roll shape. 1 honeycomb body is formed, and at a downstream of the honeycomb body, a predetermined space is provided,
Since the second honeycomb body serving as the main catalyst carrier is arranged and the stopper assembly having the insulating property is provided between the opposite ends of both the honeycomb bodies, the first honeycomb body is telescoping by the gas flow. It is possible to prevent the occurrence of.

Therefore, since it is not necessary to extend and hold the center electrode provided in the first honeycomb body to the second honeycomb body as in the conventional case, it is necessary to consider electrical insulation in the second honeycomb body. Without the need for a simple structure, and
The honeycomb body and the second honeycomb body can be charged into the same holding cylinder without difficulty, and the expansion of both honeycomb bodies due to heat
Since there is no difficulty in shrinking, the durability is improved.

Further, it is impossible to carry the catalyst by the conventional type in which the center electrode is extended, that is, the catalyst is not carried on the first honeycomb body, or the separate catalyst is provided on the first and second honeycomb bodies. In addition to being able to carry specifications,
Furthermore, since it becomes possible to support the catalysts on the first and second honeycomb bodies in separate steps, there is an effect that the degree of freedom in the manufacturing steps is increased.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view including a shaft of a metal carrier for an electrically heated catalyst device according to the present invention, FIG. 1B is a perspective view of an outer appearance of a stopper assembly forming a honeycomb body, and FIG. ) First
FIG. 3 is a schematic cross-sectional view showing a configuration of a plate material of the honeycomb body of

2 (A), (B) and (C) are schematic cross-sectional views showing a method of using a holding cylinder in the present invention.

FIG. 3 is a schematic perspective view showing a second embodiment of the stopper assembly of the present invention.

FIG. 4 is a schematic cross-sectional view including a shaft of a metal carrier for an electrically heated catalyst device according to a conventional technique.

FIG. 5 is a schematic cross-sectional view including a shaft of another metal support for an electrically heated catalyst device according to the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Corrugated plate material 2 ₁ , 2 ₂ Flat plate material 2a Flat plate 3 Insulating corrugated plate 4a Cylinder 10,30 Metal carrier 11 First honeycomb body 12 Second honeycomb body 11a, 12a Outer cylinder 13, 13 ₁ , 13 ₂ , 13 ₃ , 13 ₄ Stopper assembly 13a, 13b End surface 14 Insulator 15 Holding cylinder 16 Center electrode 17 Peripheral electrode 18 Holding body 31 First metal carrier 32 Second metal carrier C Interval

Claims (4)

[Claims] 1. A single corrugated sheet material in which a strip-shaped thin metal plate is bent to form continuous corrugated irregularities, and a plurality of flat sheet materials made of flat strip-shaped thin metal plates are mutually disposed. An insulating corrugated plate having an electrically insulating coating layer is provided between two adjacent sheets of the plurality of flat plate members that are in contact with each other and overlap each other, and are wound in a roll shape. A honeycomb body formed with a large number of mesh-like ventilation passages is formed,
The layers wound in a roll shape of the honeycomb body are electrically insulated from each other, and the honeycomb body has a center electrode in the central portion,
A first honeycomb body having a short axial length having an outer peripheral electrode opposite to the center electrode on the outer peripheral portion of the honeycomb body, and a thin metal plate in a band shape are bent to form continuous wavy irregularities. The corrugated sheet material and the flat sheet material made of a thin strip-shaped flat metal plate are in contact with each other and overlapped with each other to form a honeycomb body having a large number of mesh-like ventilation passages formed by being rolled. A second honeycomb body arranged in series at a predetermined interval downstream of the first honeycomb body, and a holding cylinder for covering the first and second honeycomb bodies and holding both the honeycomb bodies. In a metal carrier for an electrically heated catalyst device, including: a metal carrier disposed in the predetermined space between the first and second honeycomb bodies and held by the holding cylinder, the axial directions of the two honeycomb bodies facing each other. Abutting on both end faces, and at least the first honeycomb An electrically heated type having a stopper assembly for preventing the first honeycomb body from moving toward the second honeycomb body, the portion abutting against Metal carrier for catalytic devices. 2. The stopper assembly includes a corrugated sheet material formed by bending a thin metal plate in a strip shape to form continuous corrugation and a flat plate material made of a thin metal sheet in a flat strip shape.
The honeycomb body is provided with a large number of mesh-like ventilation passages formed by rolling in a roll shape so as to be in contact with each other and overlap each other, and the axial length of the honeycomb body is equal to the predetermined interval. A metal carrier for an electrically heated catalyst device as described above. 3. The stopper assembly includes the first and second stopper assemblies.
A plurality of flat plates made of rectangular thin metal plates having long sides abutting opposite end surfaces of the honeycomb body and short sides inscribed in the holding cylinder, and the flat plates connecting the rectangular flat plates to each other. The first and second
At least one cylinder made of a thin metal plate arranged substantially concentrically with the central axis of the first and second honeycomb bodies, which is held perpendicularly to the opposite end surfaces of the honeycomb body.
The metal carrier for an electrically heated catalyst device according to claim 1. 4. The electrically heated catalyst according to claim 2, wherein the density of the mesh ventilation passages of the stopper assembly is equal to or less than the density of the mesh ventilation passages of the first honeycomb body. Metal carrier for equipment.