JPH08332395A - Metal carrier - Google Patents

Abstract

PURPOSE: To obtain a metal carrier which shows high durability over a long period of time by providing a thermal stress avoiding zone at a region where a metal honeycomb element comes into contact with the inner peripheral surface of a metal casing and in the neighborhood of the region. CONSTITUTION: In a metal carrier MS consisting mainly of a metal honeycomb body H such as an S type, a space part for avoiding a thermal stress is provided at a part where the metal honeycomb element H comes into contact with a metal casing C and near the region. That is, the outer peripheral part of the metal honeycomb element H has a recessed part Ha of desired size in which the outer peripheral part does not come into contact with the inner peripheral part of the metal casing C. Consequently, it is possible to absorb and moderate a deforming force due on a thermal stress generated in the honeycomb element H, and thereby make the metal carrier M highly durable.

Description

Detailed Description of the Invention

[0001] The present invention is generally a metallic honeycomb body (hereinafter referred to as a metal honeycomb body) for carrying an exhaust gas purifying catalyst, which is used as an exhaust gas purifying means of an automobile by being interposed in an exhaust system. ) And a metal casing (hereinafter referred to as a metal casing) that encloses the metal honeycomb body. More specifically, the present invention relates to a metal honeycomb body which is a main component of a metal carrier, and more particularly to a metal honeycomb body having a structure in which a portion in contact with an inner wall surface of a metal casing to be enveloped has excellent durability. Is.

[0002]

2. Description of the Related Art A metal carrier for purifying exhaust gas is a catalyst system using an exhaust gas purifying catalyst (for example, Pt, Rh, Pd, etc.) having a honeycomb structure composed of a flat strip and a corrugated strip. And a metal casing for accommodating and fixing the metal honeycomb body inside. In addition, in the industry, the metal carrier is a metal support or a metal substrate.
l Substrate), and may be displayed by abbreviation symbol (MS). Also in the description of the present invention, the abbreviation M
S is used.

As a metal honeycomb body which is a main constituent element of the above-mentioned metal carrier (MS), various structures have been conventionally proposed. The metal honeycomb body uses an abbreviated symbol (H) hereinafter due to its honeycomb structure. However, the conventional product is indicated by (H ') (with a dash) to distinguish it from the present invention (H). For example, FIG.
The metal honeycomb body (H ′) shown in FIG. 13 has a flat strip (1 ′) as is clear from FIG. 13 (front view).
) And a corrugated strip material (2 ′) are stacked, and are rolled into a single spiral shape. The above-mentioned wound-type metal honeycomb body (H ′) is specifically, for example, 100 μm or less (preferably 50 μm or less).
Plate-shaped strip (1 ') made of a heat-resistant thin steel plate, and corrugated strip (2') prepared by corrugating the thin steel plate
And are stacked so as to have mutually abutting parts, and these are collectively spirally wound to form a large number of mesh-like vent holes (cells) (3) for exhaust gas passages in the axial direction. It has a honeycomb structure.

The above-mentioned conventional winding type metal honeycomb body (H ') is arranged in a metal casing (hereinafter, abbreviated as C is used) as shown in FIG. A carrier (MS) is manufactured. Since the metal carrier (MS) is used under the severe thermal environment condition of the exhaust gas system, the metal honeycomb body (H ') and the metal casing (C) are firmly fixed to each other and manufactured. It is something. This is because the metal honeycomb body (H ′) and the metal casing (C) are exposed to the high temperature of the exhaust gas itself and the high temperature generated by the exothermic reaction between the exhaust gas and the exhaust gas purifying catalyst, and such a high temperature atmosphere This is because a large thermal stress is applied to each element under the condition that the elements are firmly fixed by a fixing method such as brazing or welding so as to withstand the thermal stress. In addition, a metal carrier (M
Since S) is used under the condition of violent vibration addition, both the above-mentioned constituent elements are firmly fixed from the viewpoint of improving vibration resistance.

The above-mentioned wound type honeycomb body (H ')
Although it is superior to the ceramic monolith type in various points, it still leaves room for improvement with respect to the large thermal stress generated under the severe thermal conditions described above. In particular, the deforming force based on the large thermal stress generated inside the metal honeycomb body is concentrated and accumulated on the outer peripheral portion of the metal honeycomb body that abuts the inner wall surface of the metal casing and the vicinity thereof, so that the flat plate forming the metal honeycomb body is formed. The strip or corrugated strip may be deformed or buckled, or may be damaged or cracked, resulting in a great decrease in durability. This is because, in a wound type honeycomb structure, the outer peripheral portion of the metal honeycomb body which abuts the inner wall surface of the metal casing has a pair of flat plate-shaped strips (1 ′) and corrugated plate-shaped strips (2 ′). Are in contact with each other along the inner wall surface of the metal casing, that is, they are joined in a plane, and the deformation force based on thermal stress is sufficiently absorbed,
This is because it cannot be alleviated.

Recently, in place of the above-mentioned spiral-wound type metal honeycomb body (H '), a minimum structural unit constituting a honeycomb body having a honeycomb structure, that is, a set of flat plate-shaped strips in abutting relationship with each other. A metal honeycomb body (H ') having a structure in which a minimum constitutional unit composed of a corrugated strip is in contact with each end of the minimum constitutional unit against the inner wall surface of the metal casing.
Is proposed. For example, Japanese Patent Laid-Open No. 62-273050
JP-A-62-173051 and JP-A-4-2278.
55, JP-A-3-502660, JP-A-4-227.
No. 855 or the like proposes a radial type, an S-shaped type, a tongue-shaped type, and an X-wrap type (swastoid) type metal honeycomb body (H ′). The metal honeycomb body (H ′) having various structures such as the S-shaped type described above is an object of improvement by the present invention, as described later. Here, in order to understand the present invention, the structure and manufacturing process of the metal honeycomb body (H ′) having various structures will be described below with reference to the drawings.

14 to 16 show an outline including the structure of an S-shaped metal honeycomb body (H ') and its manufacturing process. That is, FIG. 14 is a front view of an S-shaped metal honeycomb body (H '), and FIG. 15 is a stack (S1) used for manufacturing the S-shaped metal honeycomb body (H'). 16), two winding molding jigs (W1, W2) are arranged on the upper and lower outermost surfaces of the substantially central portion of the stack (S), and the winding molding jigs are arranged in the same direction. It shows a method of manufacturing an S-shaped metal honeycomb body (H ') by winding. Note that FIG.
In FIG. 16, only a part of the flat plate-shaped strip (1 ′) and the corrugated plate-shaped strip (2 ′) are shown for the sake of clarity, and the others are omitted.

As shown in the figure, the S-shaped metal honeycomb body (H ') comprises a pair of flat strips (1') and corrugated strips (2 ') made of thin steel plates. Manufactured as the smallest unit. That is, as shown in FIG. 15, a flat strip (1 ') and a corrugated strip (2') are alternately laminated in a desired number of steps to form a stack (S1). Next, as shown in FIG. 16, two winding molding jigs (W1, W2) are arranged on the outer surface (upper surface and lower surface) of the stack (S1),
By winding the jig in the same direction (for example, clockwise direction), the S-shaped metal honeycomb body (H) shown in FIG. 14 is manufactured. In the figure, (3) indicates a cell. As shown in FIG. 14, in the central portion of the metal honeycomb body (H '), the flat strip (1') and the corrugated strip (2 ') which form the stack (S1) are S-shaped. Because of the curved shape, this type of metal honeycomb body is commonly referred to as an S-shaped type in the industry. Therefore, it should be noted that the S-shaped metal honeycomb body in the present invention is a general term for those manufactured by the manufacturing process.

FIGS. 17 to 18 show an outline including a toe-shaped metal honeycomb body and its manufacturing process. That is, FIG. 17 is a front view of the metal honeycomb body (H ') of the tongue and groove type. In order to clarify the figure,
Only some flat strips (1 ') and corrugated strips (2') are shown, others are omitted.

The above-mentioned Tomoe type metal honeycomb body (H '
18) is manufactured as follows, as shown in FIG. That is, three stacks (S1, S2, S3) formed by laminating flat plate-shaped strips (1 ') and corrugated plate-shaped strips (2') in a desired number of stages are used, and the central angle of each stack is 120. Abut on each other so that the angle becomes °, and combine. Next, a total of three winding molding jigs (W1, W2, W3), one on the outer surface of the central portion of each stack, are arranged as shown in FIG. 18, and the jigs are arranged in the same direction. By winding in a clockwise direction (for example, in the clockwise direction), the Tomoe type metal honeycomb body (H ′) shown in FIG. 17 is manufactured. It should be noted that the metal honeycomb body (H ') of the toe-shaped type is shown in FIG.
As shown in (1), since the central portion has a three-toothed shape, it is commonly referred to as a tomo-shaped metal honeycomb body in the art. Needless to say, there may be four or more stacks. Further, in the S-shaped and tongue-shaped metal honeycomb bodies, the front (cross-section) shape is not limited to that shown in the drawing, and may be any shape such as a race track shape.

19 to 21 show an outline including the X-wrap type metal honeycomb body (H ') and its manufacturing process. That is, FIG. 19 shows a front view of a conventional X-wrap type metal honeycomb body (H ′), and FIG. 20 shows the X-wrap type metal honeycomb body (H ′).
) Used to manufacture four stacks (X1
, X2, X3, X4) and their arrangements are shown in FIG.
FIG. 20 is an enlarged view of a central portion of the X-wrap type metal honeycomb body (H ′) shown in FIG. 19. It should be noted that, in FIGS. 19 to 21, in order to clarify the drawings, only some of the flat plate-shaped strips (1 ′) and the corrugated plate-shaped strips (2 ′) are shown, and the others are shown. Omitted.

The conventional X- which the present invention aims to improve
The shape structure of the lap type metal honeycomb body (H ') is not limited to that shown in FIG.
It goes without saying that various shapes disclosed in No. 7855 and the like are applicable. That is, by changing the front (cross-section) shape of each stack (X1 to Xn) forming the X-wrap type metal honeycomb body (H ') and the setting method of the abutting end, the front shape is changed as shown in FIG. In addition to the circular shape shown in FIG. 3, it is possible to manufacture an X-wrap type metal honeycomb body having various shapes such as an elliptical shape and a race track shape. In the industry,
As shown in FIGS. 19 to 21, in this type of X-wrap type metal honeycomb body (H ′), the contact state at the contact end portion (center portion of the metal honeycomb body) of each stack is X. Since it is in the shape of a letter or a swastika, it is commonly called an X-wrap or swastika type. Therefore, it should be noted that in the present invention, the X-wrap type metal honeycomb body is a general term for those manufactured by the above manufacturing process.

The above-mentioned conventional X-wrap type metal honeycomb body (H ') has (a) a flat metal strip (1') and a corrugated strip (2 ') made of a thin metal plate alternately. A stack of at least two or more stacks (stac
k) is formed, and (b) the stacks are brought into contact with each other at their one ends using a desired jig or the like. It is manufactured by a manufacturing process of forming by winding so as to be wound in the same direction. A jig having a desired structure suitable for holding or sandwiching one end of each stack used in the step (b) is an X-wrap type in which each stack is wound around the jig in the same direction. After manufacturing the metal honeycomb body (H '), it may be removed or integrated with the metal honeycomb body (H'). It should be noted that a stack of flat plate strips (1 ') and corrugated strip strips (2') is formed and then roll-molded to form a large number of cells (3) serving as exhaust gas passages as shown in the figure. Is automatically formed. In the structure shown in FIG. 19, one end of each stack is brought into contact with each other at an intersection angle of 90 ° in the step (b), and winding-molding is performed in the step (c) to form an X-wrap type metal honeycomb body (H
').

FIG. 22 is a front view of a radial type metal honeycomb body (H '). As shown in the drawing, this type of radial type metal honeycomb body (H ') is a flat band material (1') and a corrugated plate material (2 ') made of a desired number of thin metal plates.
') Alternate winding center axis that doubles as a winding molding jig (4)
It is manufactured by fixing one end to and then winding-molding. Since the purification elements of the flat strip (1 ′) and the corrugated strip (2) extend radially from the winding center (4) as a starting point, in the industry, this type The metal honeycomb body of is commonly called a radial type.

The metal honeycomb body (H ') having various structures such as the above-mentioned S-shaped type is one set of minimum constituent units (one set of flat strip material in the above spiral wound type metal honeycomb body). End of the metal casing (C) abuts along the inner wall surface of the metal casing (C), while each end portion of a predetermined number of the plurality of minimum constituent units is the inner wall surface of the metal casing (C). It has a structure of abutting against. Therefore, the metal honeycomb body (H ') having the above-mentioned special structure
Can absorb and relax the thermal stress at each end of the minimum constitutional unit, so that the durability is improved as compared with the above-mentioned wound type.

The metal honeycomb body (H ') having various structures such as the above-mentioned S-shaped type (see FIGS. 14 to 22)
Is the above-mentioned wound type metal honeycomb body (H ')
Similar to (see FIGS. 12 to 13), the metal casing (C) is filled and fixed to form a metal carrier (MS). FIG. 23 is a metal carrier composed of a metal honeycomb body (H ′) and a metal casing (C) of various structures such as the conventional winding type, S-shaped type, toe-shaped type, X-wrap type and radial type described above. (MS)
It is a sectional view of FIG. The point to be noted in FIG. 23 is the structure of the portion of the metal honeycomb body (H ′) that comes into contact with the inner peripheral surface of the metal casing (C), and particularly the contact with the inner peripheral surface of the metal casing (C) and the exhaust gas. This is a structure of a portion in the vicinity of the outer periphery of the end surface portion on the inflow side. It is said that the conventional metal honeycomb body shown in the figure does not adopt a special structure in the above-mentioned portion, and has a structure in which the outer peripheral surface of the metal honeycomb body (H ′) is simply in contact with the metal casing (C). It should be noted that The above-mentioned point is a big difference from the present invention, and will be described later in detail.

[0017]

SUMMARY OF THE INVENTION Metal honeycomb bodies (H ') having various conventional structures different from the above-mentioned wound type, that is, S-shaped type, beveled type, and X-wrap (swastoidal type) ) Type and radial type metal honeycomb bodies (H '), the end portions of a predetermined number of minimum constituent units are in contact with the inner wall surface of the metal casing (C), and the outer peripheral portion of the metal honeycomb body (H') is Further, since the minimum structural units can share and absorb and relax the thermal stress concentrated in the vicinity thereof, the durability of the metal honeycomb body (H ′) is improved to a certain extent. However, even in the metal honeycomb body (H ′) having various structures such as the above-mentioned S-shaped type, a large deformation force based on repeated thermal stress is repeatedly applied to the outer peripheral portion of the metal honeycomb body (H ′) and the vicinity thereof. Therefore, buckling, crack growth, breakage, and the like of the constituent members (flat plate-shaped band member and corrugated plate-shaped band member) occur, and the durability of the metal carrier is impaired. That is, when evaluated from the viewpoint of long-term durability, the metal honeycomb body (H ′) having the above-mentioned special structure still has room for improvement.

The present invention relates to the above-mentioned metal honeycomb body (H
') A metal honeycomb body (H') of an S-shaped type or the like having a structure in which the respective end portions of the constituent members (a flat plate-shaped band member and a corrugated plate-shaped band member) are in contact with the inner peripheral surface of the metal casing (C) encased ) Was proposed to improve performance. As a result of earnestly studying the above-mentioned problems of the prior art, the inventors have found that in the vicinity of the outer periphery of the metal honeycomb body (H),
In other words, a thermal stress avoidance zone (thermal stress absorption / relaxation zone) is provided at a portion (contact surface) where the metal honeycomb body (H) abuts the inner peripheral surface of the metal casing (C) and a portion in the vicinity thereof. It has been found that the provision is effective.

That is, in order to solve the various problems caused by the above-mentioned thermal stress in the contact surface between the metal honeycomb body (H) and the metal casing (C), the present inventors apply heat to the above-mentioned portion. It was found that it is effective to form a space for stress avoidance (absorption / relaxation).
The present invention is based on the above findings, and the present invention provides a metal carrier having excellent durability over a long period of time.

[0020]

Means for Solving the Problems To outline the present invention, the present invention has a honeycomb structure in which flat plate-shaped strips and corrugated strips made of a desired number of thin metal plates are alternately stacked, A metal composed of a metal honeycomb body for carrying an exhaust gas purifying catalyst having a structure in which the end of each of the strips is in contact with the inner peripheral surface of a metal casing that encloses the metal casing, and a metal casing that encases the metal honeycomb body. In the carrier, the metal honeycomb body has (i) at least one set of flat band members at a portion in contact with the inner peripheral surface of the metal casing and at a portion in the axial direction (exhaust gas inflow direction) of the metal honeycomb body. And a metal carrier having a hole portion that does not come into contact with the inner peripheral surface of the metal casing having a depth of the multiple integration of the corrugated plate material.

As described above, the metal honeycomb body (H), which is the main constituent element of the metal carrier (MS) to be improved by the present invention, has the structure shown in FIGS.
3 is a conventional S-shaped type, tongue-shaped type, X-wrap (swastoid) type, and radial type metal honeycomb body (H ′). The object of the present invention is, in particular, in this type of metal honeycomb body (H '), the durability of the portion that comes into contact with the inner peripheral surface of the metal casing to be enveloped, that is, the outer periphery of the metal honeycomb body (H'). It is intended to improve the durability of the portion and its vicinity to thermal stress.

For this reason, the present invention provides a metal honeycomb body (H ') having various structures such as the above-mentioned conventional S-shaped type.
However, the respective end portions of the flat plate-shaped band member and the corrugated plate-shaped band member, which are the minimum constituent units that form the metal honeycomb body, contact the inner peripheral surface of the metal casing (C), and at least the contact portion. The technical configuration described above paying attention to the fact that a space space for absorbing thermal stress can be efficiently formed by a notch or the like at the abutting end portions of a pair of flat plate-shaped band members and corrugated plate-shaped band members. Is adopted.

The technical constitution and embodiments of the present invention will be described below in detail with reference to the drawings. Needless to say, the present invention is not limited to the illustrated one.
Further, in the metal carrier (MS) of the present invention described below, the metal honeycomb body (H), which is a main component thereof, is an S-shaped type for convenience of explanation, but the present invention is not limited to this. Not limited.

1 to 4 are views for explaining a metal carrier (MS) according to the first embodiment of the present invention. In FIG.
The symbol (Ha) indicates a recess (space space) formed in the vicinity of the inner peripheral surface of the metal casing (C) of the metal honeycomb body (H) described later. FIG. 1 is a front view of the metal carrier (MS) of the first embodiment, and FIG. 2 is FIG.
2 is a cross-sectional view taken along line I-I of FIG. FIG. 3 is a perspective view of a stack (S1) used to manufacture an S-shaped metal honeycomb body (H) which is a main component of the metal carrier (MS) of the first embodiment. FIG. 4 is a diagram for explaining the structure of the space space (Ha) shown in FIG.

FIG. 2 shows the above-described FIG.
It is a figure corresponding to. The present invention (FIG. 2) and the prior art (FIG. 2)
The major difference between 3) is in the configuration of the metal honeycomb body (H) part which is a main constituent element of the metal carrier (MS) of the present invention, as is apparent from FIGS. 2 and 23. That is, as shown in FIG. 2, the metal honeycomb body (H) of the present invention has an inner circumference of the metal casing (C) at the outer circumferences of the exhaust gas inflow end (H1) and the exhaust gas outflow end (H2). Space space part (SP) that does not contact the surface,
In other words, it has a structure in which the metal honeycomb body (H) has a concave portion (Ha), and this point is greatly different from the prior art (FIG. 23).

In the space space portion (SP), in other words, in the size of the concave portion (Ha) of the metal honeycomb body (H), the outer edge portion of the flat exhaust gas inflow end portion (H1) and the metal casing ( The distance between C), that is, the width, is (W1
). The depth of the space portion (SP), that is, the depth in the exhaust gas flow direction (F) is (W2)
Indicated by.

In the case where the metal honeycomb body has a structure in which the outer edge of the exhaust gas inflow end (H1) does not have a recess (Ha), that is, in the case of the conventional technique shown in FIG.
Various problems caused by the above-mentioned thermal stress occur intensively in the portion corresponding to the recess (Ha). For example, a Fe-Cr (20%)-Al (5%) heat-resistant steel flat strip (thickness 40 μm) and corrugated strip (thickness 40 μm)
m, wave height 1.2 mm, pitch 2.5 mm), a conventional metal honeycomb body (H ′) (outer shape 70 mm, cell density 400 cpsi) manufactured by simply winding was used. ) And the metal casing (C) are separated from each other, and from the outermost layer to the third layer to the fifth layer (counting a set of flat plate-shaped strip and corrugated strip-shaped strip as one layer). Especially, the probability of deformation, buckling, and breakage of the first to third layers is extremely high.

On the other hand, the concave portion (Ha) of the present invention
In the case of the metal honeycomb body (H) having, the above problems are largely solved. That is, the recessed portion (Ha) of the metal honeycomb body (H) of the present invention acts as a zone for avoiding thermal stress (absorption / relaxation zone). In the present invention, the size of the recess (Ha) of the metal honeycomb body (H) is generally such that the width (W1) is 1 to 5 times as large as the wave height of the corrugated strip material. , Again depth (W2)
By setting the value of (W1) to be approximately the same as (W1), the durability is remarkably improved. The recess (Ha) is formed not only in the exhaust gas inflow end (H1) and outflow end (H2) shown in FIG. 2 but also in the substantially central portion in the axial direction of the metal honeycomb body (H) as described later. It may also be formed on the outer periphery. In such a case, it goes without saying that a value larger than the above value may be adopted as the value of (W2).

The above-mentioned space space (SP), in other words, the concave portion (H) on the side of the S-shaped metal honeycomb body (H).
The technical arrangement for forming a) is shown in FIG. As described above, the S-shaped metal honeycomb body (H) of the present invention is manufactured according to the manufacturing process described with reference to FIGS. At that time, as the stack (S1) to be used, the one shown in FIG. 3 is used instead of the stack (S1) shown in FIG. In the stack (S1) shown in FIG. 3, two sets of a flat strip (1) and a corrugated strip (2), which are the minimum constitutional units of the stack, have notches at the corners. Composed. The cutout of the flat strip (1) is (11), and the cutout of the corrugated strip (2) is (2).
1).

When the S-shaped metal honeycomb body is manufactured by using the above-mentioned stack (S1) according to a conventional method, the metal honeycomb (H) shown in FIGS. 1 and 2 is obtained. That is, recesses (Ha) are formed in the outer edge portions of the exhaust gas inflow end (H1) and the outflow end (H2) of the metal honeycomb body (H).
A metal honeycomb body (H) having is obtained. In addition, the cutouts (11, 2) of the flat strip (1) and the corrugated strip (2).
It goes without saying that the size of 1) is determined in consideration of the size of the space space portion (SP), in other words, the size of the concave portion (Ha) of the metal honeycomb body (H).
FIG. 4 shows a recess (H of the metal honeycomb body (H) of the present invention.
It is a perspective view of a crevice (Ha) part explaining structure of a). The concave portion (Ha), that is, the space space (S
P) to clarify the existence (to clarify the illustration)
Some are omitted.

In the present invention, the stack (S) used for manufacturing the S-shaped metal honeycomb body
The flat plate-shaped strip (1) that constitutes (1) is a strip used for producing a normal metal monolith type metal honeycomb body, for example, chromium steel (chrome 13 to 2).
5%), heat-resistant stainless steel such as Fe-Cr 20% -Al 5%, or heat-resistant stainless steel in which a rare earth element is added to improve the high temperature oxidation resistance, and the thickness is 0.03 mm to 0. A band material of about 1 mm is used. As the corrugated strip (2), the flat strip (1) is used.
Is used which is corrugated so as to have a predetermined substantially sine wave or substantially trapezoidal wave. In addition, flat strip (1)
The corrugated strip material (2) and the corrugated strip material (2) may have different plate thicknesses or different materials. In particular, the flat band material (1) and the corrugated plate material (2) containing Al or the surface of which is provided with an Al layer are heat treated,
It is preferable to deposit a whisker-like or mushroom-like alumina (Al ₂ O ₃ ) layer on the surface thereof.
The whisker-like alumina layer is composed of Pt, Pd, R
This is preferable because the washcoat layer for supporting the exhaust gas purifying catalyst such as h can be firmly held.

The S-shaped metal honeycomb body (H) of the present invention is the metal carrier (MS) as described above.
Is the main component of. The metal honeycomb body (H)
Are housed in a metal casing (C) and fixed to produce a metal honeycomb body (MS). The above-mentioned metal casing (C) is for accommodating the metal honeycomb body (H) inside, and has any shape as long as it has openings at both ends and has the same cross-sectional shape as the metal honeycomb body (H). It is not restricted. That is, not only a circular shape but also a race track, an elliptical shape, a polygonal shape, or another irregular cross section may be used. As the material of the metal casing (C), heat-resistant steel of the same kind as the strips (1, 2) forming the metal honeycomb body (H) may be used, or a double layer having a high heat and corrosion resistance. You may use the thing of a structure, specifically, what used ferritic stainless steel for an inner part and used austenitic stainless steel for an outer part.

5 to 6 are views for explaining the metal carrier (MS) of the second embodiment of the present invention. FIG. 5 is a front view of a metal carrier (MS) according to a second embodiment of the present invention,
It is a figure corresponding to FIG. 1 relevant to the said 1st embodiment.
The major difference between the metal carrier (MS) of the second embodiment and the first embodiment (FIG. 1) is that the metal honeycomb body (H)
The concave portion (Ha) is formed along the entire inner peripheral surface of the metal casing (C), and the other configurations are substantially the same.

FIG. 6 shows a stack (S1) used for producing a metal honeycomb body (H) constituting the metal carrier (MS) of the second embodiment, which is related to the first embodiment. It is a figure corresponding to FIG. As shown, the stack (S1) related to the second embodiment is
All the corners of the plate-like strip (1) and the corrugated strip (2) from the uppermost layer to the lowermost layer which constitute the stack (S1) and are alternately laminated have notches (11, 21). It is a thing. When the stack (S1) having the above structure is used and an S-shaped metal honeycomb body is manufactured by a conventional method,
The metal honeycomb body (H) shown in FIG. 5 is obtained.

Various modifications can be made to the metal carrier (MS) of the present invention. Hereinafter, as a description of a modification of the metal carrier (MS), another stack (S1) used for manufacturing the metal honeycomb body (H) which is a main component of the metal carrier (MS) will be described.

FIG. 7 relates to a metal carrier (MS) according to a third embodiment of the present invention, which is used for manufacturing an S-shaped metal honeycomb body (H) which is a main component thereof. It is a perspective view of a stack (S1). A characteristic point of the illustrated stack (S1) is that a desired number of strips (at least one set of flat strips and corrugated strips) forming an intermediate layer between the uppermost layer and the lowermost layer at both ends of the stack are formed. The material has a notch. Also in this case, the recessed portion (Ha) of the metal honeycomb body (H) is formed in a symmetrical portion as in the case shown in FIG.

FIG. 8 relates to a metal carrier (MS) according to a fourth embodiment of the present invention, which is used for manufacturing an S-shaped metal honeycomb body (H) which is a main component thereof. It is a perspective view of a stack (S1). A characteristic point of the illustrated stack (S1) is that a flat plate is formed at an intermediate portion between the uppermost layer and the lowermost layer at both end portions of the stack, and at a substantially central portion when viewed as an exhaust gas inflow direction when a metal honeycomb body is formed. This is the point in which the notches (11, 21) are formed in the strip-shaped strip (1) and the corrugated strip (2). In this case, since the space space portion (SP) is formed in the outer peripheral portion of the substantially central portion of the metal honeycomb body (H) in the axial direction (the same direction as the exhaust gas flow F), the metal honeycomb body (H)
The large deformation force due to the thermal stress generated in the axial center part of is absorbed and relaxed in the space space (SP).

FIG. 9 relates to a metal carrier (MS) according to a fifth embodiment of the present invention, which is used for manufacturing an S-shaped metal honeycomb body (H) which is a main component thereof. The top view of the flat plate-shaped strip | belt material (1) of the outermost layer of the stack (S1) is shown. The structure of the corrugated strip (2) stacked alternately with the flat strip (1) is shown in FIGS.
~ It is omitted because it can be easily understood from Fig. 7. The flat strip (1) shown in FIG. 9 differs from the flat strip (1) of the stack (S1) of FIG. 3 (first embodiment) in that the notch (11) is rectangular. The point is that it is formed of a shape. The cutout portion in FIG. 3 is formed in a triangular shape.

FIG. 10 relates to a metal carrier (MS) according to a sixth embodiment of the present invention, which is used for manufacturing an S-shaped metal honeycomb body (H) which is a main component thereof. FIG. 3 is a plan view of the flat plate-shaped strip (1) of the outermost layer of the stack (S1). FIG. 10 is a diagram corresponding to FIG. 9. The flat strip (1) shown in FIG. 10 is different from the flat strip (1) shown in FIG. 9 in that the notch (11) is the same as that shown in FIG. 1)
The point is that it is formed at substantially the center of both ends (the part that comes into contact with the metal casing when a metal honeycomb body is formed). Similar to the fourth embodiment (see FIG. 8), the notch (11) in the central portion serves as a recess (H) that serves as a zone for avoiding thermal stress generated in the substantially central portion of the metal honeycomb body (H).
a) is formed.

FIG. 11 relates to a metal carrier (MS) according to a seventh embodiment of the present invention, which is used for manufacturing an S-shaped metal honeycomb body (H) which is a main component of the metal carrier. FIG. 3 is a plan view of the flat plate-shaped strip (1) of the outermost layer of the stack (S1). FIG. 11 is a diagram corresponding to FIG. 9. A characteristic point of the flat strip (1) shown in FIG. 11 is that when the cutout is a metal honeycomb body (H), a recess (Ha) is formed only on the exhaust gas inflow end (H1) side. The point is that they are formed. In the metal honeycomb body (H), the exhaust gas inflow end (H1)
Is a portion where the high-speed and high-temperature exhaust gas flow first encounters, and the thermal stress generated inside the metal honeycomb body (H) propagates to the outer peripheral portion of the exhaust gas inflow end portion (H1). It is necessary to enhance the ability to absorb and relax thermal stress. The flat plate strip (1) shown in FIG. 11 and a corrugated strip strip (2) having similar notches are stacked (S1
) And the S-shaped metal honeycomb body (H1) is formed, a recess (Ha) is formed in the outer peripheral portion of the exhaust gas inflow end (H1), so that the above requirement can be satisfied.

Although not shown, various modifications are possible in the present invention. For example, the following modifications are possible. (1) In place of the S-shaped metal honeycomb body described above, a metal carrier (MS) can be formed by using a Tomoe-shaped, X-wrap type and radial-type metal honeycomb body as main constituent elements. . (2) The holes formed in the flat plate-shaped strip (1) and the corrugated plate-shaped strip (2) (holes that do not come into contact with the inner peripheral surface of the metal casing) are not limited to the above-mentioned cutouts, but may be desired. It may be a hole. For example, instead of forming by notching, a desired portion may be cut and double-folded to form a hole.

[0042]

Industrial Applicability The present invention is an S-shaped type having a structure in which each end of the constituent members (a flat plate-shaped band member and a corrugated plate-shaped band member) of the metal honeycomb body is in contact with the inner peripheral surface of the metal casing which is enveloped. It is intended to improve the durability of a metal carrier (MS) (which is a main constituent element) in which a metal honeycomb body (H) having various structures such as a tongue-shaped type, an X-wrap type, and a radial type is incorporated. In a metal honeycomb body (H) such as an S-shaped type which is a main constituent element of the metal carrier (MS) of the present invention, the metal honeycomb body (H) contacts the inner peripheral surface of the metal casing (C). A thermal stress avoidance zone (absorption of thermal stress, a relaxation zone) is provided at the contacting portion (contacting surface) and its vicinity.

That is, in the metal carrier (MS) having the S-shaped metal honeycomb body (H) of the present invention as a main component, the metal honeycomb body (H) is
Avoiding thermal stress (absorption, relaxation) in the contact surface between the metal honeycomb body (H) and the metal casing (C) and in the vicinity thereof.
Space space portion for use in other words, that is to say, a metal honeycomb body (H) having an outer peripheral portion with a recess of a desired size that does not contact the inner peripheral surface of the metal casing (C). It The concave portion formed on the outer peripheral portion of the metal honeycomb body can effectively absorb and relax the deforming force based on the thermal stress generated inside the metal honeycomb body (H). Therefore, according to the present invention, a metal carrier (MS) having excellent durability, which includes the metal honeycomb body (H) having various structures such as the S-shaped type as a main constituent element.
Will be provided.

[Brief description of drawings]

FIG. 1 is a front view of a metal carrier (MS) according to a first embodiment.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a perspective view of a stack used for manufacturing the metal carrier (MS) of the first embodiment.

FIG. 4 is a diagram illustrating a structure of a recess (Ha) in a metal honeycomb body (H) portion of the metal carrier (MS) of the first embodiment.

FIG. 5 is a front view of a metal carrier (MS) according to a second embodiment.

FIG. 6 is a perspective view of a stack used for manufacturing the metal carrier (MS) of the second embodiment.

FIG. 7 is a perspective view of a stack used for manufacturing the metal carrier (MS) of the third embodiment.

FIG. 8 is a perspective view of a stack used for manufacturing the metal carrier (MS) of the fourth embodiment.

FIG. 9 is a plan view of a flat plate-shaped strip as an outermost layer of a stack used to manufacture the metal honeycomb body (H) of the metal carrier (M) of the fifth embodiment.

FIG. 10 is a plan view of a flat plate-shaped strip as an outermost layer of a stack used for producing the metal honeycomb body (H) of the metal carrier (M) of the sixth embodiment.

FIG. 11 is a plan view of a flat plate-shaped strip as an outermost layer of a stack used for producing the metal honeycomb body (H) of the metal carrier (M) of the seventh embodiment.

FIG. 12 A conventional winding type metal honeycomb body (H
FIG. 3 is a perspective view of a metal carrier (MS) using the above ().

13 is a front view of the wound-type metal honeycomb body (H ′) of FIG.

FIG. 14 is a front view of a conventional S-shaped metal honeycomb body (H ′).

FIG. 15 is a perspective view of a stack used to manufacture a conventional S-shaped metal honeycomb body (H ′).

FIG. 16 is a diagram illustrating a manufacturing process of a conventional S-shaped type metal honeycomb body (H ′).

[Fig. 17] Conventional Tomoe type metal honeycomb body (H
') Is a front view.

FIG. 18: Conventional Tomoe type metal honeycomb body (H
2] is a diagram illustrating a manufacturing process of FIG.

FIG. 19 is a front view of a conventional X-wrap type metal honeycomb body (H ′).

FIG. 20 is a diagram illustrating a stack used for manufacturing a conventional X-wrap type metal honeycomb body (H ′) and a method of arranging the stack.

FIG. 21 is an enlarged view of the center portion for explaining the structure of the winding center portion of the conventional X-wrap type metal honeycomb body (H ′).

FIG. 22 is a front view of a conventional radial type metal honeycomb body (H ′).

FIG. 23 is an axial cross-sectional view of a metal honeycomb body (MS) including a conventional metal honeycomb body (H ′) as a main constituent element.

[Brief description of reference numerals]

 MS: Metal carrier H: Metal honeycomb body (of the present invention) Ha: Recess H1: Exhaust gas inflow end of the metal honeycomb body H2: Exhaust of the metal honeycomb body Gas outflow end F ………… Exhaust gas flow direction SP ………… Space space S1, S2 ………… Stack X1, X2 ………… Stack 1 ………… Flat plate strip 11 ………… Notch of flat strip 2 ………… Corrugated strip 21 ………… Notched of corrugated strip 3 ………… Reticulated vent passage (cell) 4 ………… Winding Roll forming jig (rolling center axis) W1, W2 ………… Roll forming jig

Claims (13)

[Claims] 1. An inner circumference of a metal casing having a honeycomb structure in which a desired number of thin metal plate flat strips and corrugated strips are alternately stacked, and an end portion of each strip is encased. In a metal carrier comprising a metal honeycomb body for carrying an exhaust gas purifying catalyst having a structure in contact with a surface, and a metal casing enclosing the metal honeycomb body, the metal honeycomb body comprises (i) a metal casing (Ii) At least a set of flat plate-shaped band members and corrugated plate-shaped band members in a region where they abut on the inner peripheral surface and in the axial direction (exhaust gas inflow direction) of the metal honeycomb body, the metal casing having a depth of integration. A metal carrier having a hole that does not come into contact with the inner peripheral surface of the metal carrier. 2. A stack of metal honeycomb bodies formed by alternately stacking a desired number of flat strips and corrugated strips.
The metal carrier according to claim 1, wherein the metal carrier is an S-shaped type, a tongue-shaped type, or an X-wrap (swastoidal) type metal honeycomb body manufactured by winding and forming the stack by using one piece or two or more pieces. . 3. The strip material constituting the stack, wherein the strip material from the uppermost layer of at least one end portion of the stack to the desired step has a hole portion by a notch.
The metal carrier according to. 4. The metal carrier according to claim 2, wherein in the strips constituting the stack, all strips from the uppermost layer of at least one end of the stack have holes formed by notches. 5. A strip constituting a stack, wherein a desired number of strips forming an intermediate layer between the uppermost layer and the lowermost layer at at least one end of the stack have holes formed by notches. The metal carrier according to claim 2. 6. The hole portion is an end portion (corner portion) on the front surface side of the stack (exhaust gas inflow end portion in the case of a metal honeycomb body).
The metal carrier according to any one of claims 3 to 5, which is formed in the above. 7. The hole is an end (corner) on the rear surface side of the stack (exhaust gas outflow end when a metal honeycomb body is used).
6. The metal carrier according to any one of 3 to 5, which is formed in 1. 8. The end portions (corner portions) of the stack are a front surface side (exhaust gas inflow end portion when forming a metal honeycomb body) and a rear surface side (exhaust gas outflow end portion when forming a metal honeycomb body) of the stack. The metal carrier according to any one of claims 3 to 5, which is formed in (4). 9. The front side of the stack (exhaust gas inflow end when the metal honeycomb body is formed) and / or the rear surface side (exhaust gas outflow end when the metal honeycomb body is formed) of the stack, and the front surface. The metal carrier according to any one of claims 3 to 5, which is formed in a substantially intermediate portion between the side and the rear surface side. 10. A metal honeycomb body, one end of which is fixed to a winding center portion, and a desired number of flat plate-shaped strips and corrugated plate-shaped strips, which are arranged alternately, The metal carrier according to claim 1, wherein the metal carrier is a radial type metal honeycomb body manufactured by winding around the center. 11. The metal carrier according to claim 10, wherein the flat plate-shaped band member and the corrugated plate-shaped band member have a hole formed by a notch at the other end that abuts on the inner peripheral surface of the metal casing. 12. The flat plate-shaped band member and the corrugated plate-shaped band member are partially or wholly provided with holes formed by notches.
1. The metal carrier according to 1. 13. The hole portion is selected from an exhaust gas inflow end portion of the metal honeycomb body, an exhaust gas outflow end portion of the metal honeycomb body, and a substantially middle portion between the exhaust gas inflow end portion and the exhaust gas outflow end portion. It is formed in a portion where
The metal carrier according to 2.