JPH09220481A - Metal carrier for electrically-heated catalytic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the telescoping of the rolled electrically-heated first honeycomb body arranged on the upstream side of the rolled second honeycomb body forming the metal carrier for a catalytic device, having an unbonded insulating corrugated sheet and long in the axial direction. SOLUTION: Plural support pins 13 are provided in the space C between the second honeycomb body 12 and electrically-heated first honeycomb body 11 set in series, and the telescoping of the first honeycomb body 11 is blocked by the second honeycomb body 12. The second honeycomb body 12 is not telescoped since it is long in the axial direction. The cylindrical support pins 13 is abutted on the first honeycomb body with its end face 13a and held by the second honeycomb body 12 with a shaft 13c extending from the end face 13b. The total area of the end faces is controlled to <=30% of the total area of the air passage of the honeycomb body. The end face 13a of the support pin 13 is furnished with an insulating coating layer, or the pin is made of a ceramic, etc.

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 an electrically heated metal carrier which has a small capacity but is intended for effective 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.

As an example of the structure of the first metal carrier, as shown in FIG. 8, one corrugated plate 41 and a plurality of flat plates 42 are provided.
Are overlapped with each other, and an insulating corrugated plate 43 having an electrically insulating coating layer is interposed between two adjacent ones of a plurality of flat plates 42 and wound in a roll shape to form a metal carrier having a honeycomb structure, Electrodes for electrically connecting the layers wound in a roll shape to each other are provided at the ends of the plate material at the beginning and end of the winding of the honeycomb body 40 to connect to a power source, and a current is applied in the winding direction of the honeycomb body 40. The honeycomb body 40 is electrically heated by flowing. The insulating corrugated sheet 43 is not usually joined by brazing. The power consumption, that is, the heat generation amount, of the metal carrier for an electrically heated catalyst device formed in this manner is set by increasing or decreasing the number of flat plates 42 and adjusting the cross-sectional area of the electric resistor (hereinafter, this will be performed). Plate flat structure).

As another example, as shown in FIG.
One corrugated plate 51 and at least one flat plate 52 are stacked to form 1
Layers, two or more layers are superposed, and at least one corrugated sheet in the superposed layers is provided with an electrically insulating coating layer to form an insulating corrugated sheet 53, which is wound in a roll shape to form a honeycomb structure. Electrodes 4 and 5 for forming a metal carrier and connecting to the power source at the ends of the plate material at the beginning and end of the winding of the honeycomb body 50.
Is provided and the honeycomb body 50 is electrically heated by passing an electric current in the winding direction of the honeycomb body 50. The power consumption of the metal carrier for an electrically heated catalyst device thus formed, that is, the heat generation amount is set by increasing or decreasing the number of layers to be stacked (hereinafter referred to as a multilayer structure).

In FIG. 6, 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. 7, the central electrode 26 provided in the central portion of the electrically heated first honeycomb body 21 is extended and charged in 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.

[0013]

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 is prone to telescoping.

[0015]

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. At least two or more layers, which are formed by abutting and overlapping at least one flat plate material made of a strip-shaped thin metal plate, are stacked and wound in a roll shape to form a large number of mesh-like ventilations. Forming a honeycomb body with passages,
At least one of the stacked layers of corrugated sheet material,
An electrically insulating coating layer is applied to electrically insulate the layers wound in a roll shape without being bonded, and a central electrode is provided at the center of the honeycomb body, and a central electrode is provided at the outer peripheral portion of the honeycomb body. A first honeycomb body having a reverse axial electrode and a current flowing between the center electrode and the peripheral electrode for heating the honeycomb body, which has a short axial length, and a thin metal plate in a band shape are continuously bent. The corrugated sheet material with the irregular corrugations and the flat sheet material made of a thin metal plate in the shape of a flat strip are in contact with each other and overlap each other and are wound in a roll shape to form a large number of mesh-like ventilation passages. A second honeycomb body, which is in the form of a honeycomb body and is arranged downstream of the first honeycomb body in series and at a distance, and a holding cylinder which covers the first and second honeycomb bodies and holds both the honeycomb bodies. A metal carrier for an electrically heated catalyst device, comprising: And a plurality of spacing pieces in contact with the axial end portion facing the second honeycomb body.

The above-mentioned spacing piece has both end surfaces perpendicular to the axis of the honeycomb body, and the size of the end surface is larger than the size of one ventilation passage forming the first honeycomb body, One of both end surfaces has a shaft portion parallel to the axis of the honeycomb body, and the shaft portion can be inserted into one of the air passages forming the second honeycomb body, and by the air passage and brazing. It has a shape capable of being joined, and it is preferable that the shaft portion is inserted into the ventilation passage from the end portion of the second honeycomb body by 5 mm or more.

Further, the total area of the end faces of the plurality of spacing pieces is preferably 30% or less of the total cross-sectional area of the ventilation passages of the honeycomb body.

A metal material is used as the material of the spacer pieces, and an electrically insulating coating layer is applied to the end faces of the spacer pieces that come into contact with the first honeycomb body. Further, a heat resistant electrically insulating material can be used as an alternative material.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The metal carrier for an electrically heated catalyst device according to the present invention comprises at least two or more layers obtained by stacking one corrugated plate and at least one flat plate, and among the stacked layers. Of at least one corrugated sheet, an electrically insulating coating layer is applied to electrically insulate the layers as an insulating corrugated sheet, and one end of the stacked layers is wound as a center to form a honeycomb body. A first honeycomb body for heating the honeycomb body by passing an electric current in a winding direction of the honeycomb body, and another corrugated sheet material and a flat sheet material are superposed and rolled in a roll shape to form a second honeycomb body. And a second honeycomb body is arranged at a predetermined interval in series downstream of the first honeycomb body, and a plurality of abutting end portions of both honeycomb bodies are contacted within the predetermined interval. The spacing pieces are arranged.

Even in the first honeycomb body having a short axial length and the insulating corrugated sheet interposed between the rolls without being joined, a plurality of spacing pieces held by the second honeycomb body are provided. As a result, the movement toward the downstream in the axial direction is stopped, so there is no possibility of telescoping due to the flow of exhaust gas during use.

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.

When an electrically insulating coating layer is applied to a corrugated sheet forming at least one of the stacked layers to form an insulating corrugated sheet, the coating layer can be applied to one side or both sides of the corrugated sheet. . When the coating layer is provided on both sides, it is not joined to the flat plate, but when the coating layer is provided on only one side, the surface without the coating layer can be joined to the flat plate, which is effective in preventing telescoping.

There are the following methods for applying the electrically insulating coating layer to the spacer and the corrugated plate. 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 the base material of the corrugated plate or the interval piece, and after the formation, 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, an aluminum oxide film is deposited.

The spacing pieces are provided with an insulating coating on at least the end faces that abut the first honeycomb body.

In the roll-shaped honeycomb body formed by using the insulating corrugated sheet whose both surfaces are coated with the electrically insulating coating layer by the above-mentioned method, the winding start portion and the winding end portion of the insulating corrugated sheet are brazed to the flat plate material. By doing so, an electric current can be made to flow through the insulating corrugated plate as a heating element, which is effective as a method of increasing power consumption. In addition, the insulating corrugated sheet having the coating layer on only one side can be joined to the flat plate on one side, so that it can be used as a heating element and the same effect can be obtained.

[0027]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 (A) is a schematic cross-sectional view including a shaft of a metal carrier for an electrically heated catalyst device of the present invention, FIG. 1 (B) is a perspective view of an outer appearance of a support pin, and FIG. 1 (C) is of FIG. FIG. 2 is a schematic perspective view of the appearance of the second honeycomb body, showing a state in which support pins are inserted, and FIG. 2 is a schematic diagram showing the configuration of the plate material of the electrically heated first honeycomb body of FIG. FIG.

In FIG. 1 (A), a metal carrier 10 for an electrically heated catalyst 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 plurality of cylindrical support pins 13, which are spacing pieces, are provided at a predetermined spacing C. The outer surfaces of the first honeycomb body 11 and the second honeycomb body 12 are the outer cylinder 11 respectively.
It is covered with a and 12a, and is further inserted into a common holding cylinder 15 via an electric insulator 14.

As shown in FIG. 2, the first honeycomb body 11 includes a corrugated sheet material 1 in which a strip-shaped thin metal plate is bent to form continuous corrugations, and a flat strip-shaped thin sheet. A layer formed by _one flat plate material 2 ₁ made of a metal plate and an electrically insulating coating layer formed by bending a flat metal plate 2 ₂ and a strip-shaped thin metal plate to form a continuous wavy pattern And the corrugated sheet 3 for insulation having a layer formed on top of each other are stacked, and the flat plate materials 2 ₁ and 2 ₂ and the corrugated sheet 3 for insulation are wound in a roll shape without being joined with a brazing material. Has been formed. At the center of the first honeycomb body 11, an elongated rod-shaped center electrode 16 having a circular cross section is arranged and joined to the corrugated sheet material 1 and the flat sheet materials 2 ₁ and 2 ₂ . Since each roll-shaped layer of the first honeycomb body 11 is insulated by the insulating corrugated plate 3, the outer peripheral electrode 17 is provided at the end of the outer peripheral portion of the roll of the corrugated plate material 1 and the flat plate materials 2 ₁ and 2 _2. Thus, the plate material between the center electrode 16 and the outer peripheral electrode 17 forms a roll-shaped electric resistor. Therefore, by connecting the central electrode 16 and the outer peripheral electrode 17 to power sources (not shown), the first honeycomb body 11 becomes an electrically heated metal carrier.

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. 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 support pins 13 are spacing pieces arranged in a predetermined spacing C between the first and second honeycomb bodies, and as shown in FIG. One end face 13
a cylindrical shape having a and 13b, one end surface 13b
A shaft portion 13c parallel to the axis of the honeycomb body is fixedly provided in the. The cross-sectional shape of the shaft portion 13c in the direction perpendicular to the axis is the second
The honeycomb body 12 is charged into one of the ventilation passages and has a shape that can be joined to the ventilation passages by a brazing material. The length of the shaft portion 13c is set such that at least 5 mm can be inserted into the ventilation passage. The other end surface 13a abuts on the end portion of the first honeycomb body 11 to prevent the first honeycomb body 11 from telescoping due to the gas flow. End face 13
The area of a is equal to or slightly larger than the area of one ventilation passage of the first honeycomb body 11. That is, the size is determined according to the density of the ventilation passage, but the diameter is usually 1
It is in the range of 10 mm.

The shape of the support pin 13 is not limited to the cylindrical shape as shown in FIG. 1 (B), and the cross-sectional shape is polygonal or cross-shaped, but the maximum dimension of the end face is shown in FIG.
It is necessary that the size is equal to or larger than the size inscribed in the circle of diameter A of the cylinder of (B).

The required number of support pins varies depending on the capacity and structure of the first honeycomb body 11, but the total area of the end faces is 30% or less of the total cross-sectional area of the air passages of the first honeycomb body 11. Is preferred. The reason is 30%
If it exceeds the range, resistance to gas flow becomes large, increasing pressure loss, causing clogging when supporting the catalyst on the metal carrier, and not supporting the catalyst layer in the air passage provided with the support pin. This is because the catalyst efficiency becomes insufficient and the gas flow in the downstream portion of the support pin becomes poor, so that the catalyst efficiency decreases.

The dimension of the distance C between the first and second honeycomb bodies, that is, the axial length of the cylindrical portion of the support pin 13 is taken into consideration in terms of insulation between both honeycomb bodies and thermal efficiency as a heating type metal carrier. It is desirable to set the distance between 2 and 30 mm.

As shown in FIG. 1C, the support pins 13 may be arranged in a spiral shape along the end of the insulating corrugated plate 3 of the first honeycomb body 11 to be electrically heated. Although desirable, it is possible to prevent telescoping as well,
Any arrangement may be used.

When a conductive material such as iron or stainless steel is used as the material of the support pin 13, at least one end face 13a contacting the electrically heated first honeycomb body 11 needs to be electrically insulated. There is. If the support pin is used alone as a method of electrical insulation, P
By VD, CVD or ion plating method,
A pin made of a material coated with aluminum oxide (Al ₂ O ₃ ) or another insulating coating layer or containing aluminum or a material obtained by immersing in molten aluminum to form an iron-aluminum alloy layer is used. An insulating coating layer is obtained by firing in the air. In order to obtain an insulating coating layer after assembling the support pins to the honeycomb body, a material containing aluminum in advance in the support pins or a material dipped in molten aluminum is used to form an insulating coating layer of aluminum oxide by an atmospheric firing method. obtain.

As the material of the support pin 13, an electrically insulating material having heat resistance such as ceramic can be used.

A holding cylinder 15 as shown in FIG. 1 (A) is used to fix the first honeycomb body 11 and the second honeycomb body 12. The holding cylinder 15 is used in the following manner. There are those as shown in FIG. 3 (A) and FIG. 3 (B). In the embodiment shown in FIG. 3 (A), the outer cylinder of the first honeycomb body 11 is extended to cover the outer cylinder 12a of the second honeycomb body 12 and the holding cylinder 15 is formed. In the embodiment shown in B), the outer cylinder of the second honeycomb body 12 is extended to cover the outer cylinder 11a of the first honeycomb body 11, and the holding cylinder 15
Is formed. These holding cylinders 15 are fixed to the outer cylinders 12a or 11a by welding or the like.

In order to carry the catalyst, it is possible to carry out it simultaneously after assembling 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.

The support pin according to the present invention has first and second support pins.
Since it is possible to prevent the occurrence of telescoping of the electrically heated first honeycomb body by providing it between the honeycomb bodies, the shape of the first honeycomb body is suitable for electrically heating. The axial length can be shortened, and a multi-layer structure or a flat plate multiplex structure can be adopted to meet the power consumption needs.

Next, in the design of the electrically heated honeycomb body, the construction of the plate material for setting various power consumption will be described.

FIG. 4 is a schematic cross-sectional view showing the construction of various plate materials of the metal carrier for an electrically heated catalyst device according to the present invention, which is a conventional flat plate having a total length of 1 and a corrugated plate. A honeycomb body consisting of one layer including a reference layer is used as a reference layer, and the reference layer is divided into layers having a length of l / 2 to 1/8, and the respective layers are stacked to form a plate material, Fig. 3 shows the respective comparative power consumption (heat generation amount) based on a layer and a layer of the basic type of the present invention in which two layers are stacked. At this time, assuming that the electric resistance value of each plate material for each layer is the same,
In addition, at least one of the corrugated sheets is provided with an insulating coating layer,
An electric current can be applied to all the plate materials in the winding direction.

In FIG. 4, a "reference layer" consisting of a corrugated plate 1 and a flat plate 2 with a total length 1 according to the prior art is cut in half in the longitudinal direction and stacked to form a basic structure of the present invention. If a two-layer stacked structure is formed, the total cross-sectional area of the plate material will be twice as large as that of the reference layer, and since the total length is 1/2, the electrical resistance value will be 1/4, and therefore the power consumption will be 4 Can be doubled, while the weight and pressure loss remain unchanged,
The heating rate becomes faster. Similarly, if the total length 1 is cut into 1/3 to 1/8 and stacked in 3 to 8 layers, the sectional area of the plate material becomes 3 to 8 times, and the total length becomes 1/3 to 1/8. Therefore, the electric resistance value is 1/9 to 1/64 with respect to the reference layer of the conventional technique, and therefore the power consumption is 9
It can be doubled to 64 times.

The honeycomb body having a multilayer structure according to the present invention formed in this manner can significantly increase power consumption without increasing weight and pressure loss.

Further, based on the basic two-layer structure of the present invention, the power consumption when stacked in three layers is 2.25.
Double. In this case, when it is necessary to set the power consumption in finer steps up to 2.25 times, in the two-layer stacking structure which is the basic structure of the present invention, as shown in FIG.
By adding one flat plate without changing the total length of the plate material, the cross-sectional area of the plate material becomes 5/4 times, and therefore the power consumption is 5 /
4 times = 1.25 times. In the same way, by adding one more flat plate with a two-layer stack structure one by one,
It is possible to finely increase the power consumption by 1.75 times and 2.0 times.

As described above, according to the present invention, the number of layers and / or the number of flat plates is increased / decreased and the length in the winding direction of the layers is further increased / decreased based on the two-layer structure as a basic form. Then, a honeycomb body having desired power consumption can be obtained.

[0047]

As described above, according to the present invention, at least two layers formed by overlapping one corrugated sheet material and at least one flat sheet material are stacked, and at least one corrugated sheet material is electrically insulating. A first electrically heated honeycomb body having a short axial length, which is formed by coating without being bonded and is wound into a roll, is formed. The second honeycomb body, which is the main catalyst carrier, is arranged at intervals, and the plurality of spacing pieces are provided between the opposite ends of both the honeycomb bodies. There is an effect that it is possible to prevent the occurrence of telescoping.

Therefore, since it is not necessary to extend and hold the center electrode provided in the first honeycomb body to the second honeycomb body, it is not necessary to consider electrical insulation in the second honeycomb body, and the structure is simple. In addition, the first honeycomb body and the second honeycomb body can be charged into the same holding cylinder without difficulty, and since the honeycomb body can be expanded and contracted by heat, durability is improved. Has the effect.

Furthermore, the number of at least one of the number of stacked layers and the number of flat plate materials of the first honeycomb body is increased or decreased, or the length of the layers in the winding direction is increased or decreased. As a result, the power consumption during design can be set in a wide range and finely, so that the weight and pressure loss of the honeycomb body can not be increased, the heating can be done uniformly, the brazing part does not overheat, the heating speed is fast, and telescoping is possible. It is possible to meet the detailed needs of customers regarding power consumption without fear of causing power consumption.

[Brief description of drawings]

FIG. 1 (A) is a schematic cross-sectional view including a shaft of a metal carrier for an electrically heated catalyst device of the present invention, (B) is a perspective view of an outer appearance of a support pin, and (C) is a second part of (A). 2 is a schematic perspective view of the appearance of the honeycomb body of FIG.

FIG. 2 is a schematic cross-sectional view showing the configuration of the plate material of the first honeycomb body of FIG. 1 (A).

3 (A) and 3 (B) are schematic cross-sectional views including axes of different embodiments of the present invention.

FIG. 4 shows a metal carrier for an electrically heated catalyst device according to the present invention,
3 is a schematic cross-sectional view showing various multilayer structures and a chart showing a comparison of power consumption of each multilayer structure in comparison with a reference layer.

FIG. 5 shows a metal carrier for an electrically heated catalyst device according to the present invention,
It is a chart which shows the comparison of power consumption of a multilayer + flat plate multiplex structure.

FIG. 6 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. 7 is a schematic cross-sectional view including a shaft of another metal carrier for an electrically heated catalyst device according to the related art.

FIG. 8 is a diagram of a metal carrier for an electrically heated catalyst device according to a conventional technique, (A) is a schematic diagram showing a configuration of a plate material, and (B) is a diagram.
[Fig. 3] is a schematic cross-sectional view perpendicular to the axis of the honeycomb body.

[Fig. 9] Fig. 9 is a view of a metal carrier for an electrically heated catalyst device according to a conventional technique, (A) is a view showing a configuration of a plate material, and (B) is a perspective view of a honeycomb body.

[Explanation of symbols]

1,41,51 Corrugated sheet material / corrugated sheet 2 ₁ , 2 ₂ , 42,52 Flat plate material / flat plate 3,43,53, Corrugated sheet for insulation 4,5 Electrode 10,30 Metal carrier 11,21 First honeycomb body 12, 22 Second honeycomb body 11a, 12a Outer cylinder 13 Spacing piece / support pin 13a, 13b End face 13c Shaft portion 14 Insulator 15 Holding cylinder 16,26 Center electrode 17 Outer peripheral electrode 31 First metal carrier 32 Second Metal carrier 40,50 Honeycomb body

Claims (7)

[Claims] 1. A corrugated sheet material in which a strip-shaped thin metal plate is bent to form continuous corrugations and at least one flat plate material made of a flat strip-shaped thin metal plate are mutually provided. A layer formed by abutting on and overlapping with each other to form a honeycomb body having a large number of mesh-like ventilation passages formed by stacking and winding at least two layers, At least one layer of the corrugated sheet material is provided with an electrically insulating coating layer to electrically insulate the layers wound in the roll shape without being joined, and has a center electrode at the center of the honeycomb body. The outer peripheral portion of the honeycomb body has an outer peripheral electrode that is reverse to the center electrode, and the honeycomb body is heated by passing a current between the center electrode and the outer peripheral electrode. A short first honeycomb body and a strip shape A corrugated sheet material formed by bending a thin metal plate to form continuous corrugations and a flat sheet material made of a thin metal sheet in a flat band shape are abutted against each other and overlapped and wound into a roll shape. A honeycomb body having a mesh-like ventilation path is formed, and a second honeycomb body is provided downstream of the first honeycomb body in series and at a distance, and covers the first and second honeycomb bodies. In the metal carrier for an electrically heated catalyst device, which includes a holding cylinder for holding both honeycomb bodies, a plurality of spacing pieces abutting the facing axial ends of the first and second honeycomb bodies. A metal carrier for an electrically heated catalyst device, comprising: 2. The spacing piece has both end faces perpendicular to the axis of the honeycomb body, and the size of the end faces is larger than the size of one ventilation passage forming the first honeycomb body. And one of the both end surfaces has a shaft portion parallel to the shaft,
The metal for an electrically heated catalyst device according to claim 1, wherein the shaft portion has a shape that can be inserted into the one ventilation passage forming the second honeycomb body and can be joined to the ventilation passage by brazing. Carrier. 3. The metal carrier for an electrically heated catalyst device according to claim 2, wherein the shaft portion of the spacing piece is inserted from the end portion of the second honeycomb body by 5 mm or more. 4. The metal carrier for an electrically heated catalyst device according to claim 1, wherein the total area of the end faces of the plurality of spacing pieces is 30% or less of the total cross-sectional area of the ventilation passages of the honeycomb body. . 5. The metal carrier for an electrically heated catalyst device according to claim 1, wherein the material of the spacing piece is a metal material. 6. The metal carrier for an electrically heated catalyst device according to claim 1, wherein at least the end surface of the spacing piece that is in contact with the first honeycomb body has an electrically insulating coating layer. 7. The metal carrier for an electrically heated catalyst device according to claim 1, wherein the material of the spacing piece is a heat resistant electrical insulating material.