JPH06277528A - Catalyst carrier for exhaust gas purifying device - Google Patents

Abstract

PURPOSE:To avoid thermal stress fatigue, even if a carrier is used for a long period of time and to prevent damage from the vicinity of a brazed connection part of a cell wall by partially connecting between a flat plate forming the cell wall and a corrugated plate, while a unjoined place due to a notched part of a beltlike brazing filler metal is present on. CONSTITUTION:A catalyst unit body 9 for exhaust purifying device is wound in mutilayers such that the flat plate 2 made of a beltlike metallic foil and the corrugated plate 3 are placed alternately and also is brazed and joined with the interposed brazing filler metal 10 and the whole is formed in a roll form and also formed in a honeycomb structure. As the razing filter wetol 10, there is used one having a belt-like notched part 11 along the longitudinal direction, and between the flat plate 2 forming the cell wall and the corrugated plate 3 is partially joined, while the joined place due to the notched part 11 is present on. Thus the flat plate 2 forming the cell wall and the corrugated plate 3 absorb shrinkage difference caused by difference in the shapes and the thermal stress is mitigated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst carrier for an exhaust gas purification device. That is, the present invention relates to a catalyst carrier which is used in a catalytic converter for cleaning exhaust gas of an automobile engine and other various kinds of exhaust gas and to which a catalytic substance is attached as a supporting base.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view of a conventional example of this kind.
Figure (1) shows the flat plate, (2) shows the corrugated plate, (3)
The figure shows the whole. As shown in the same figure, the catalyst carrier 1 for the conventional exhaust gas purifying apparatus has a flat plate 2 made of metal foil shown in FIG. 1 and a corrugated plate 3 made of metal foil shown in FIG. A typical example is one in which and are wound in a multilayer so that they are alternately positioned, and brazed and joined by a brazing material 4 interposed therebetween, and as shown in FIG. While forming a roll shape, cell walls were formed by the flat plate 2 and the corrugated plate 3 to form a honeycomb structure. (3) In the figure, 5 indicates each cell of the catalyst carrier 1, and 6 indicates an outer cylinder of the catalyst carrier 1.

In the conventional catalyst carrier 1, the brazing material 4 which brazes and joins the flat plate 2 and the corrugated plate 3 forming the cell wall of the conventional catalyst carrier 1 forms a pair of strips with the flat plate 2 and the corrugated plate 3. Was being treated by. FIG. 8 is a cross-sectional view of such a conventional catalyst carrier 1, FIG. 1 (1) shows one example thereof, and FIG. 8 (2) shows another example.

That is, the brazing material 4 of the conventional catalyst carrier 1
As shown in (1) of FIG. 8, the belt-shaped flat plate 2 and the corrugated plate 3 have a band shape having substantially the same width and the same length. 8 or (2) in FIG. 8 or a flat plate 2 which forms a cell wall and has a band shape having a predetermined width as shown in FIG. 8B. Of the contact portion of the corrugated plate 3, the exhaust gas inlet side end portion 7 and the exhaust gas outlet side end portion 8
Etc. were brazed and jointed as a joint portion A as a whole. In addition, B in (2) of FIG. 8 shows a non-bonded portion. As described above, the conventional brazing material 4 has a predetermined width, and the catalyst carrier 1
Is entirely interposed between the flat plate 2 and the corrugated plate 3 forming the cell wall from the center part to the outer peripheral part on the outer cylinder 6 side, and they are brazed and bonded with the same bonding strength from the central part to the outer peripheral part. Was.

[0005]

By the way, the following problems have been pointed out in such a conventional example. First of all, in the catalyst carrier 1, when used, for example, when driving an automobile, high-temperature exhaust gas containing harmful substances from the engine passes through the cells 5 thereof and contacts and reacts with the attached catalyst substance. Be cleaned. As described above, in a use environment in which high-temperature exhaust gas passes and heat is generated due to a catalytic reaction, the flat plate 2 and the corrugated plate 3 forming the cell wall of the catalyst carrier 1 have a thermal expansion due to a difference in shape. The shrinkage coefficients are different, and there is a difference in the amount of expansion when heated at high temperature and the amount of shrinkage when cooled at room temperature. That is, the corrugated sheet 3 formed by bending the flat plate material as the raw material and continuously forming the corrugated irregularities and the flat plate 2 using the flat plate material as the raw material have different shapes and lengths of the raw material. Due to the difference, the amount of expansion when used, that is, at the time of heating at a high temperature, and the amount of contraction when not used, that is, at the time of cooling at room temperature are different, and the corrugated plate 3 is much easier to expand and contract than the flat plate 2.
However, in the conventional catalyst carrier 1, such a flat plate 2
As described above, the corrugated plate 3 and the corrugated plate 3 are brazed with the same joint strength from the central portion to the outer peripheral portion by the brazing material 4 having a predetermined width, which is paired with the corrugated sheet 3, and is integrally regulated. .

Therefore, in the conventional catalyst carrier 1, thermal stress acts due to the difference in expansion and contraction between the flat plate 2 and the corrugated plate 3 forming the cell wall in the radial direction and the axial direction, and when used for a long time. Repeated expansion and contraction due to thermal stress causes thermal stress fatigue,
Degradation, damage, cracks, breakage, etc. were likely to occur near the brazed joint between the cell walls formed by the flat plate 2 and the corrugated plate 3. As described above, in the conventional catalyst carrier 1 for an exhaust gas purifying apparatus, it is pointed out that the thermal stress fatigue is caused by the use environment,
There was a problem with durability.

Secondly, in such a use environment in which high-temperature exhaust gas passes and heat generation due to a catalytic reaction is also observed, the central portion of the catalyst carrier 1 and the outer cylinder 6 side which is cooled and radiated by the outside air. The outer peripheral portion of the exhaust gas, the exhaust gas inlet side end portion 7,
A large temperature difference occurs between the exhaust gas outlet side end portion 8 and the like, and a difference in expansion and contraction occurs. That is, there is a difference in the amount of expansion during use, that is, during heating at high temperature, and the amount of contraction during non-use, that is, during room temperature cooling.
However, in the conventional catalyst carrier 1, as described above, the flat plate 2 and the corrugated plate 3 forming the cell wall are formed of the brazing material 4 paired with the flat plate 2 and the corrugated plate 3 at least at the exhaust gas inlet side end portion 7 and the exhaust gas outlet side end portion. 8 was designated as a joint portion A with a predetermined width, and was brazed and jointed with the same joint strength from the central portion to the outer peripheral portion, and was integrally regulated.

Therefore, in the conventional catalyst carrier 1, there is a difference in expansion and contraction in the radial direction and the axial direction between the central portion and the outer peripheral portion, the exhaust gas inlet side end portion 7, the exhaust gas outlet side end portion 8 and the like. As a result, thermal stress acts, and when used for a long period of time, thermal stress fatigue occurs due to repeated expansion and contraction due to thermal stress. Therefore, the outer periphery of the outer cylinder 6, the exhaust gas inlet side end 7, the exhaust gas outlet side end In the portion 8 and the like, deterioration, damage, cracks, breakage and the like were likely to occur from the vicinity of the brazed joint of the cell wall formed by the flat plate 2 and the corrugated plate 3. The conventional catalyst carrier 1 for an exhaust gas purifying apparatus has a problem in durability due to the fact that thermal stress fatigue is pointed out based on the environment in which the catalyst carrier 1 is used.

In view of such circumstances, the present invention has been made to solve the problems of the above-mentioned conventional example, and in claim 1, a brazing material having a band-shaped notch is formed, In claim 2, a brazing material having a strip shape and having a large number of holes is adopted, in claim 3, a brazing material having a thin strip shape of a straight line or a corrugation is adopted, and in claim 4, a plurality of divided pieces are used. By adopting the brazing material, the flat plate forming the cell wall and the corrugated plate are partially joined to each other, so that the thermal stress is relaxed first, and secondly, this is also excellent in cost. It is an object of the present invention to propose a catalyst carrier for an exhaust gas purification device that is realized.

[0010]

The technical means of the present invention for achieving this object are as follows. That is, the catalyst carrier for the exhaust gas purifying device is wound in multiple layers such that the flat plate and the corrugated plate made of metal foil in a strip shape are alternately located, and brazed and joined with a brazing filler metal, The whole has a roll shape and a honeycomb structure.
In the present invention, the brazing material is a band-shaped material having notches formed along the longitudinal direction, and the non-bonding portion between the flat plate and the corrugated plate forming the cell wall is formed by the notches. It is partially joined while existing. Further, in the present invention, the brazing filler metal is used in the form of a strip and processed with a large number of holes, so that the flat plate and the corrugated plate forming the cell wall are not joined by the large number of holes. Partly joined while remaining in place. In the present invention, the brazing material used is a linear or corrugated strip, and the flat plate and the corrugated plate that form the cell wall are partially bonded together with a non-bonded portion. . In Claim 4, the brazing material is formed into various strips and is divided into a plurality of sheets at intervals along the longitudinal direction, so that between the flat plate and the corrugated plate that form the cell wall,
Partial bonding is performed while there is a non-bonded portion due to the spacing.

[0011]

Since the present invention comprises such means, it operates as follows. The catalyst carrier according to claim 1 is a brazing filler metal having a band shape and notches formed along the longitudinal direction, the brazing filler metal having a band shape and having a large number of holes formed therein, and the claim 3 is According to the present invention, the strip-shaped brazing material having a linear or corrugated shape is formed by interposing a plurality of brazing materials having various strip shapes and divided at intervals along the longitudinal direction. With these, between the flat plate and the corrugated plate that form the cell wall,
It is partially brazed with some non-bonded parts. The catalyst carrier is used in a use environment in which high-temperature exhaust gas passes and heat is also generated by the catalytic reaction.

Therefore, firstly, the flat plate and the corrugated plate forming the cell wall differ in the amount of expansion when heated at high temperature and the amount of contraction when cooled at room temperature due to the difference in shape, and the corrugated plate is more preferable. It easily expands and contracts, causing a difference in expansion and contraction. Further, the central portion of the catalyst carrier and the outer peripheral portion, the exhaust gas inlet side end portion, the exhaust gas outlet side end portion, etc.
There is a large temperature difference and a difference in expansion and contraction occurs. Therefore, in this catalyst carrier, since brazing is partially performed while there are non-bonding points as described above, and there are intervals at the bonding points and the bonding strength is different and dispersed at each point, so such expansion / contraction difference is absorbed. Is
Thermal stress is relieved. Therefore, even if it is used for a long period of time, expansion and contraction due to thermal stress is relaxed, and thermal stress fatigue is avoided,
Deterioration, damage, cracks, breakage, etc. from the vicinity of the brazed joints between the cell walls, especially around the brazed joints of the cell walls such as the outer periphery, the exhaust gas inlet side end, the exhaust gas outlet side end, etc. are prevented. It Secondly, this is realized by reducing the material of the brazing material and reducing the material cost by the notch, the hole processing, the strip-like shape, the division and the like.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 shows a first embodiment of the present invention, wherein (1) is a perspective view of each member and (2) is a sectional view. 2 (1) and 2 (2) are perspective views of the brazing filler metal of the second and third embodiments, and FIGS. 2 (3) and 4 (4) are
It is sectional drawing of 3rd Example. 3 (1) and 3 (2) are perspective views of the brazing filler metals of the fourth and fifth embodiments, and FIG. 3 (3).
FIG. 4 (4) is a sectional view of the fourth and fifth embodiments. FIG. 4 shows a sixth embodiment, (1) is a plan view of each member,
(2) The figure is a sectional view. FIG. 5 is a plan view of the brazing material, FIG. 1 shows the seventh embodiment, FIG. 2 shows the eighth embodiment, and FIG. 3 shows the ninth embodiment. (4)
The drawing shows that of the tenth embodiment, (5) shows that of the eleventh embodiment, and (6) shows that of the twelfth embodiment. FIG. 6 shows a thirteenth embodiment, (1) is a plan view of each member,
(2) The figure is a sectional view. Hereinafter, description will be given with reference to each of these drawings.

The catalyst carrier 9 for this exhaust gas purification device is
In each of the examples, the flat plate 2 and the corrugated plate 3 made of a metal foil in a strip shape are wound in multiple layers so as to be alternately positioned, and are brazed and joined together by the brazing material 10 interposed, and the whole is formed. It has a honeycomb structure as well as a roll shape.

First of all, the corrugated plate 3 will be described in detail.
The corrugated or stamped metal foil such as a strip of stainless steel foil is formed into a corrugated concavo-convex pattern having a predetermined pitch and height, which is continuously bent. A strip-shaped stainless foil or the like having the same thickness and the same material as the corrugated plate 3 is used as it is (see FIG. 1 (1), FIG. 7 (1), (2), etc.). The corrugated plate 3 is usually a right-angled side in the longitudinal direction of the strip, that is, a corrugated shape is formed along the width direction. It is also possible to use a so-called helical waveform in which the waveform is not perpendicular to the side of, but is formed. Then, such flat plates 2 and corrugated plates 3 are wound up in multiple layers while being superposed such that they are alternately positioned from a fixed center point, and the contact portions of both are described later in the brazing material 10
By brazing and joining, the catalyst carrier 9 having a roll shape with an entire cross-sectional shape is molded (see also FIG. 7 (3)). The catalyst carrier 9 is not limited to this type, and various other types are possible, for example, one in which two flat plates 2 and one corrugated plate 3 are wound,
A plurality of sets of flat plates 2 and corrugated plates 3 are bundled and wound at the same time, a perfect circular roll is slightly crushed to form a track field with a substantially elliptical cross section, and various other patterns. A catalyst carrier 9 is conceivable.

The catalyst carrier 9 has a honeycomb structure (see also FIG. 7 (3)). That is, the flat plate 2 and the corrugated plate 3 form a cell wall, and have a substantially triangular shape, a substantially square shape, a substantially trapezoidal shape,
It is formed of a planar assembly of a large number of hollow columnar cells 5 each having a substantially semi-hexagonal shape and other various shapes, each of which is divided into independent spaces. Since the catalyst carrier 9 has such a honeycomb structure, it has an excellent weight-to-weight ratio strength and is lightweight and has high rigidity and strength, as well as a general honeycomb core, and also has a rectifying effect, plane accuracy, heat retention, and sound insulation. It is known that it has excellent properties and the like, is easy to mold, and is excellent in cost. Further, because the surface area per unit volume is large, that is, the surface areas of the flat plate 2 and the corrugated plate 3 that are the cell walls are large, for example, it is used in a catalytic converter for cleaning exhaust gas of an automobile engine, etc. As a result, the surfaces of the flat plate 2 and the corrugated plate 3 serving as the cell walls are coated and adhered with a catalytic substance.
That is, a catalytic substance such as a noble metal for redox that reacts and removes various harmful substances in the exhaust gas is coated and adhered to the surface via a carrier layer such as alumina. The catalyst carrier 9 is coaxially housed in the outer cylinder 6 which is a case made of stainless steel or the like, and the outermost periphery and the outer cylinder 6 are joined by brazing or the like.

Each embodiment of the present invention will be described below.
In each embodiment, as the brazing material 10, various materials such as non-crystalline amorphous filler brazing material by the continuous liquid quenching method, other fillers, pastes, etc. are used. First, the first, second, third, fourth, fifth, sixth and sixth aspects of the present invention shown in FIG. 1, FIG. 2, FIG. 3, FIG. 7 will be described. In the catalyst carrier 9 of each of these examples, the brazing material 10 interposed between the flat plate 2 and the corrugated plate 3 is a band-shaped brazing material having a notch 11 formed in the longitudinal direction. The flat plate 2 forming the wall and the corrugated plate 3 are partially joined while leaving a non-joined portion C by the notch 11.

First, in the first embodiment of FIG. 1, as shown in FIG. 1 (1), a band-shaped brazing material 10 having substantially the same width and length as the band-shaped flat plate 2 and corrugated plate 3 is used. The brazing filler metal 10 has a notch 11 formed in a rectangular shape in the central portion along the longitudinal direction, and its tip side (center side of the catalyst carrier 9) is opened. And such a notch 11
By using the brazing filler metal 10 on which the
In the catalyst carrier 9 of the embodiment, as shown in FIG. 2B, a large columnar non-joining portion C formed by the notch 11 is present in the central portion, and a joining portion D is formed around it. .
In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

In the second embodiment shown in FIGS. 2 (1) and 3 (3), as shown in FIG. 1 (1), a band-shaped brazing material having substantially the same width and the same length as the flat plate 2 and the corrugated plate 3 is formed. A notch 11 is formed in the material 10 in the shape of an elongated hole in the central portion along the longitudinal direction. By using the brazing filler metal 10 in which the notch 11 is formed, as shown in FIG. 3C, the catalyst carrier 9 of the second embodiment has the meat formed by the notch 11 near the center. A thick ring-shaped non-bonding portion C is present, and a bonding portion D is formed around the non-bonding portion C. In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

In the third embodiment shown in FIGS. 2 (2) and 4 (4), as shown in FIG. 2 (2), a band-shaped brazing material 10 having substantially the same width and the same length as the flat plate 2 and the corrugated plate 3 is provided. On the other hand, the notch 11 is formed on most of the part along the longitudinal direction, leaving the base side (outer peripheral side of the catalyst carrier 9). Then, by using the brazing filler metal 10 in which such a notch 11 is formed, in the catalyst carrier 9 of the third embodiment, as shown in FIG. To 8
A large columnar non-bonded portion C is formed by the cutout portion 11, and a bonded portion D is formed around it. In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

Further, in the fourth embodiment shown in FIGS. 3 (1) and 3 (3), as shown in FIG. 1 (1), a band-shaped brazing material having substantially the same width and the same length as the flat plate 2 and the corrugated 3 is formed. In FIG. 10, two notches 11 are formed in parallel with each other in the shape of an elongated hole in the vicinity of the central portion along the longitudinal direction. By using the brazing filler metal 10 having such notches 11, the catalyst carrier 9 of the fourth embodiment has both notches 11 near the center as shown in FIG. 3C. While there are two thick ring-shaped non-bonding points C by the above, a bonding point D is formed around them.
In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

In the fifth embodiment shown in FIGS. 3 (2) and 3 (4), as shown in FIG. 2 (2), a strip-shaped brazing material 10 having substantially the same width and the same length as the flat plate 2 and the corrugated plate 3 is provided. On the other hand, the notch 11 is formed to have a narrow width on the base side (on the outer peripheral side of the catalyst carrier 9) and a wide width on the other side at the center in the longitudinal direction. The notch 11 of the fifth embodiment has the same structure and function as the division interval 12 of the thirteenth embodiment of FIG. 6 which will be described later, and the brazing filler metal 10 has an interval in the center along the longitudinal direction and left and right. It is divided into two sheets. And such a notch 1
By using the brazing filler metal 10 on which No. 1 is formed, in the catalyst carrier 9 of the fifth embodiment, as shown in FIG.
A large columnar shape is formed in the central portion, and a non-joint portion C having outer flange portions on the left and right is formed toward the outer peripheral portion,
A joint portion D is formed around it. In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

Further, in the sixth embodiment shown in FIG. 4, (1)
As shown in the figure, a notch 11 extends along the longitudinal direction on a brazing filler metal 10 having the same width (slightly narrower) and the same length as the flat plate 2 and the corrugated plate 3, and the base side (the outer peripheral portion of the catalyst carrier 9). Side) is formed in parallel in the shape of an elongated hole, and one is formed in a large rectangle from the central portion toward the tip side (center side of the catalyst carrier 9), and the tip side is open. By using the brazing filler metal 10 having the notch 11 formed as described above, the catalyst carrier 9 of the sixth embodiment has a large cylindrical shape in the central portion as shown in FIG. A non-joint portion C in which an inner flange-shaped portion is formed is formed from the left and right toward the center portion, and a joint portion D is formed around the non-joint portion C. In the illustrated example, the non-joint portion C is also formed at the exhaust gas inlet side end portion 7 and the exhaust gas outlet side end portion 8. In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

In the seventh embodiment shown in FIG. 5A,
A band-shaped brazing material 10 having substantially the same width and length as the flat plate 2 and the corrugated plate 3.
On the other hand, the notch 11 is formed obliquely from the base end to the tip, and is thus divided into the long triangular brazing filler metal 10 and the long triangular notch 11. Then, by using the brazing filler metal 10 in which such a notch 11 is formed, the joint portion D is formed while the corresponding non-joint portion C exists, and thus the flat plate 2 and the corrugated plate 3 forming the cell wall. The catalyst carrier 9 joined together with a gap between them is formed (not shown). Further, the present invention is such that the first, second, third, fourth, fifth, sixth and seventh of FIG. 1 to FIG.
In addition to the cutouts 11 shown in the respective examples, the brazing material 10 having the cutouts 11 of various other shapes is used to join the flat plate 2 and the corrugated plate 3 forming the cell wall to each other. It is also possible to obtain the catalyst carrier 9 in which the joint portion D is formed while the non-joint portion C described above is present, and which is joined with a partial gap.

Next, FIG. 5 (2), (3), (4)
The eighth, ninth, and tenth embodiments of the present invention shown in the drawings will be described. In the catalyst carrier 9 of each of these embodiments (see those of other embodiments), the brazing material 10 interposed between the flat plate 2 and the corrugated plate 3 is a linear or corrugated strip. Thus, the flat plate 2 forming the cell wall and the corrugated plate 3 are partially joined while leaving the non-joined portion C (see the other embodiments).

That is, in the eighth embodiment shown in FIG. 5 (2), the brazing material 10 having the same length as that of the flat plate 2 and the corrugated plate 3 and having the shape of a linear strip is used, and FIG. 5 (3) is used. In the ninth embodiment, a thin strip-shaped brazing filler metal 10 having substantially the same length as the flat plate 2 and the corrugated plate 3 and having a substantially triangular corrugation is used. In the tenth embodiment shown in FIG. A strip-shaped brazing material 10 having substantially the same length as that of the corrugated sheet 2 and the corrugated sheet 3 and having a substantially quadrangular bent waveform is used. As a matter of course, as such a strip-shaped brazing material 10, in addition to the linear, triangular, and quadrangular corrugations as in each of these embodiments, other various corrugation shapes and other various shapes are conceivable. . In each of the eighth, ninth, tenth, etc. embodiments, since the brazing material 10 having a linear or corrugated strip shape is used as described above, a space between the flat plate 2 and the corrugated plate 3 forming the cell wall is formed. Is a strip-shaped brazing material 1
Only the portion which passes through 0 is set as the joint portion D (see the other embodiments), and the other portion is joined as the non-joint portion C (see the other embodiments), and thus, The catalyst carrier 9 is also joined partially with a gap.

Next, the eleventh and twelfth embodiments of the present invention shown in FIGS. 5 (5) and 6 (6) will be described.
In the catalyst carrier 9 of each of these embodiments (see those of other embodiments), the brazing material 10 interposed between the flat plate 2 and the corrugated plate 3 has a band shape and is provided with a large number of holes. The flat plate 2 and the corrugated plate 3 that form the cell wall are used.
The spaces are partially bonded while leaving a non-bonded portion C (see the other embodiments) formed by a large number of holes 13.

That is, in the eleventh embodiment of FIG. 5 (5), a band-shaped brazing material 10 having substantially the same length and width as the flat plate 2 and the corrugated plate 3 is used. A large number of round hole-shaped holes 13 are formed by punching or the like. Further, in the twelfth embodiment shown in FIG. 5 (6), a strip-shaped brazing material 10 having substantially the same length and width as the flat plate 2 and the corrugated plate 3 is used. A hole 13 having a hole shape is formed. Of course, the holes 13 formed in the brazing filler metal 10 may have various directions, positions, numbers, and shapes in addition to those shown in these embodiments, for example, slits having a slight width. It may have a shape. Then, in the eleventh and twelfth embodiments, the band-shaped brazing material 10 in which a large number of holes 13 are formed as described above is used, so that between the flat plate 2 and the corrugated plate 3 forming the cell wall, The joint portion D is formed while leaving the non-joint portion C (see the other embodiments) formed by the holes 13, so that the catalyst carrier 9 is joined with a partial gap.

Next, a thirteenth embodiment of the present invention shown in FIG. 6 will be described. In the catalyst carrier 9 of the thirteenth embodiment,
The brazing material 10 interposed between the flat plate 2 and the corrugated plate 3 has various strip shapes as shown in FIG. 6 (1) and is divided into a plurality of pieces with a division interval 12 along the longitudinal direction. Therefore, as shown in FIG. 6 (2), the flat plate 2 and the corrugated plate 3 forming the cell wall are partially separated from each other with the non-bonded portion C formed by the dividing interval 12. It is joined.

That is, in the thirteenth embodiment of FIG. 6,
The linear strip-shaped brazing filler metal 10 according to the eighth embodiment of FIG. 5 (2) described above is arranged in the center in the longitudinal direction, and there are division intervals 12 on the left and right sides of the brazing filler metal 10. Corrugated and strip-shaped brazing filler metal 1 according to the ninth embodiment of FIG.
0s are arranged in parallel. Therefore, as shown in FIG. 6 (1), the left and right brazing filler metals 10 in the shape of a strip having substantially the same length as that of the flat plate 2 or the corrugated plate 3 and the center of the linear strip having a length of about half thereof are provided. The brazing material 10 and the division interval 12 along the longitudinal direction
It is divided into three parts. Of course, the mode of division of the brazing filler metal 10 is not limited to that of this embodiment, but may be divided into two, four or more divisions, or into other strips of various shapes. Is possible. In the illustrated embodiment, the side edge intervals 14 are also formed on the left and right side edges outside the left and right brazing filler metals 10. And this first
In the catalyst carrier 9 of the third embodiment and the like, by using the brazing filler metal 10 thus divided, as shown in FIG. 6B, non-bonding corresponding to the division interval 12 and the side edge interval 14 is performed. The portion C is formed near the center, the exhaust gas inlet side end portion 7, the exhaust gas outlet side end portion 8 and the like, and the joint portion D corresponding to the divided brazing filler metal 10 is formed. In this way, the flat plate 2 forming the cell wall and the corrugated plate 3 are joined with a partial gap.

The present invention is constructed as described above. Then it becomes as follows. First, the catalyst carrier 9 for the exhaust gas purifying apparatus is first, second, third, fourth, and fourth shown in FIG. 1, FIG. 2, FIG. 3, FIG. In each of the fifth, sixth, and seventh embodiments, the brazing filler metal 10 in the form of a band and having the notch 11 formed in the longitudinal direction is interposed,
Further, in each of the eighth, ninth, and tenth embodiments shown in FIG. 5, (2), (3), (4), etc., the linear or corrugated strip-shaped brazing material 10 is used as an interposer. And (5) and (6) in FIG.
In the eleventh and twelfth embodiments shown in the drawings and the like, the brazing filler metal 10 in the form of a strip and having a large number of holes 13 is interposed. Furthermore, in the thirteenth embodiment of FIG. A plurality of brazing filler metals 10 that are divided at intervals of 12 are interposed. As a result, each of the catalyst carriers 9 has a flat plate 2 and a corrugated plate 3 forming the cell walls thereof.
The space is partially bonded while leaving the non-bonded portion C.

Then, each cell 5 of such a catalyst carrier 9 is formed.
During use, for example, when driving an automobile, exhaust gas containing harmful substances from an engine or the like passes through, and the harmful substances come into contact with and react with the attached catalytic substances to be removed and cleaned. As described above, the catalyst carrier 9 is used in a use environment in which high-temperature exhaust gas passes and heat is also generated by the catalytic reaction. Then, it becomes the following first and second.

First, in the flat plate 2 or the corrugated plate 3 forming the cell wall of the catalyst carrier 9, the corrugated plate 3 is formed by bending the flat plate material, which is a raw material thereof, so that the corrugated irregularities are continuously folded. The flat plate 2 has a curved shape, whereas the flat plate 2 is made of a flat plate material which is a raw material. Therefore, the two have different thermal expansion and contraction coefficients due to such a difference in shape, and the amount of expansion during use, that is, at high temperature heating, and the amount of contraction during non-use, that is, at room temperature cooling are originally different, Corrugated sheet 3 is flat sheet 2
It is much easier to expand and contract, resulting in a difference in expansion and contraction. Further, the central portion of the catalyst carrier 9 and the outer cylinder 6 that is cooled and radiated by the outside air
There is a large temperature difference between the outer peripheral portion on the side, the exhaust gas inlet side end portion 7, the exhaust gas outlet side end portion 8 and the like, and the expansion amount and the contraction amount differ, resulting in a difference in expansion and contraction.

Now, in this catalyst carrier 9, as described above, the non-joint portion C is partially brazed and joined, and the joint portion D is spaced at an appropriate position. That is, the flat plate 2 and the corrugated plate 3 of the catalyst carrier 9 can be freely deformed and expanded / contracted without being restricted at the non-bonded portion C, and the bonding strength is the catalyst carrier of the conventional example of this type shown in FIGS. 7 and 8 described above. As shown in No. 1, they are not the same from the central part to the outer peripheral part, but are dispersed at different places. In this catalyst carrier 9, the expansion and contraction difference between the flat plate 2 and the corrugated plate 3 described above is absorbed, and the center portion, the outer peripheral portion, the exhaust gas inlet side end portion 7,
The difference in expansion and contraction with the exhaust gas outlet side end portion 8 and the like is also absorbed, so that the thermal stress is relieved. Therefore, even if the catalyst carrier 9 is used for a long period of time, expansion and contraction due to thermal stress is relaxed, and the occurrence of thermal stress fatigue due to repeated thermal stress, which was pointed out in the conventional catalyst carrier 1, is avoided. Therefore, this catalyst carrier 9
Then, in the vicinity of the brazing joint between the cell walls composed of the flat plate 2 and the corrugated plate 3, particularly in the vicinity of the brazing joint of the cell walls such as the outer peripheral portion, the exhaust gas inlet side end portion 7, the exhaust gas outlet side end portion 8 and the like. Deterioration, damage, cracks, rupture, etc. are reliably prevented.

Secondly, and yet this is realized at an excellent cost. That is, in this catalyst carrier 9, the notch 1
1. Since the number of holes 13 formed by hole processing, forming the strip shape, and the division interval 12 and the like reduce and save the material of the brazing filler metal 10, the above-mentioned first point is realized by reducing the material cost. To be done.

[0036]

As described above, the catalyst carrier for the exhaust gas purifying apparatus according to the present invention employs a brazing material having a band-like shape and a notch in claim 1, and claim 2 in the present invention.
A brazing material having a strip shape and having a large number of holes is adopted. In claim 3, a linear or corrugated thin brazing material is adopted, and in claim 4, a plurality of divided brazing materials are adopted. As a result, the flat plate forming the cell wall and the corrugated plate are partially joined to each other, and the following effects are exhibited.

First, the thermal stress is relieved. Therefore, this catalyst carrier avoids thermal stress fatigue even after long-term use,
Near the brazed joint of the cell wall formed by a flat plate or corrugated plate,
In particular, deterioration, damage, cracks, breakage, etc. from the vicinity of the brazed joint of the cell wall such as the outer peripheral portion, the exhaust gas inlet side end portion, the exhaust gas outlet side end portion, etc. are reliably prevented, and the durability is improved. Second
Moreover, this is realized at low cost and excellent in cost, such as reduction in material cost. As described above, the effects of the present invention are remarkably large, such as the problems existing in this type of conventional example are eliminated.

[Brief description of drawings]

1 shows a first embodiment of a catalyst carrier for an exhaust gas purifying apparatus according to the present invention, FIG. 1 (1) is a perspective view of a flat plate, corrugated plate, brazing material, etc., and FIG. FIG. 3 is a cross-sectional view of a catalyst carrier.

2A and 2B show second and third embodiments of the present invention, FIG. 1A is a perspective view of a brazing filler metal of the second embodiment, and FIG. 2B is a perspective view of a brazing filler metal of the third embodiment. Yes, (3) is a sectional view of the catalyst carrier of the second embodiment, and (4) is a sectional view of the catalyst carrier of the third embodiment.

3A and 3B show fourth and fifth embodiments of the present invention, FIG. 1A is a perspective view of a brazing filler metal of the fourth embodiment, and FIG. 3B is a perspective view of a brazing filler metal of the fifth embodiment. , (3) is a sectional view of the catalyst carrier of the fourth embodiment, and (4) is a sectional view of the catalyst carrier of the fifth embodiment.

FIG. 4 shows a sixth embodiment of the present invention, (1) is a plan view of a flat plate, corrugated plate, brazing material, etc., and (2) is a sectional view of a catalyst carrier.

FIG. 5 shows the seventh, eighth, ninth, tenth, eleventh, and eighth aspects of the present invention.
It is a top view of the brazing filler metal of a 12th Example, (1) figure shows the thing of 7th Example, (2) shows the thing of 8th Example,
(3) is for the ninth embodiment, and (4) is for the tenth embodiment.
FIG. 5 (5) shows that of the 11th embodiment.
(6) FIG. 14 shows the twelfth embodiment.

FIG. 6 shows a thirteenth embodiment of the present invention, in which FIG. It is a plan view of a brazing material and the like, and (2) is a cross-sectional view of a catalyst carrier.

FIG. 7 is a perspective view of a catalyst carrier for an exhaust gas purifying apparatus according to a conventional example, FIG. 1 (1) shows its flat plate, FIG. 2 (2) shows its corrugated plate, and FIG.

FIG. 8 is a cross-sectional view of the catalyst carrier of the conventional example, FIG. 1 (1) shows one example thereof, and FIG. 8 (2) shows another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 catalyst carrier (conventional example) 2 flat plate 3 corrugated plate 4 brazing material (conventional example) 5 cell 6 outer cylinder 7 exhaust gas inlet side end 8 exhaust gas outlet side end 9 catalyst carrier (of the present invention) ) 10 brazing filler metal (of the present invention) 11 notch portion 12 division interval 13 hole 14 side edge spacing A joint portion (conventional example) B non-joint portion (conventional example) C non-joint portion (present invention) ) D joint (of the present invention)

Claims (4)

[Claims] 1. A belt-shaped metal foil flat plate and corrugated plate are wound in multiple layers so that they are alternately positioned, and brazed and joined together by a brazing filler metal so that the whole is in a roll shape and honeycomb. A catalyst carrier for an exhaust gas purifying device having a structure, wherein the brazing filler metal has a band shape and is provided with a notch along the longitudinal direction, and thus the flat plate and corrugated plate forming a cell wall. A catalyst carrier for an exhaust gas purifying apparatus, characterized in that the spaces are partially bonded while leaving a non-bonded portion by the cutout. 2. A strip-shaped metal foil flat plate and corrugated plate are wound in multiple layers so that they are alternately positioned, and are brazed and joined together with a brazing filler metal intervening to form a roll-shaped honeycomb. A catalyst carrier for an exhaust gas purifying device having a structure, wherein the brazing filler metal is in the form of a band and is provided with a large number of holes, and is thus used between the flat plate and the corrugated plate forming a cell wall. The catalyst carrier for an exhaust gas purifying apparatus is characterized in that it is partially bonded while leaving a non-bonded portion due to a large number of the holes. 3. A flat plate and a corrugated plate made of metal foil in a strip shape are wound in multiple layers such that they are alternately positioned, and brazed and joined together by a brazing filler metal so that the whole is in a roll shape and a honeycomb. A catalyst carrier for an exhaust gas purifying device, which has a structure, wherein the brazing filler metal has a linear or corrugated strip shape, and a non-joint portion is provided between the flat plate and the corrugated plate forming the cell wall. A catalyst carrier for an exhaust gas purifying device, wherein the catalyst carrier is partially bonded while existing. 4. A belt-shaped flat plate made of metal foil and corrugated plates are wound in multiple layers such that they are alternately positioned, and brazed and joined together with a brazing filler metal so that the whole is roll-shaped and honeycomb. A catalyst carrier for an exhaust gas purifying device having a structure, wherein the brazing material is formed into a plurality of strips and is divided into a plurality of sheets at intervals along the longitudinal direction to form a cell wall. A catalyst carrier for an exhaust gas purifying device, characterized in that the flat plate and the corrugated plate are partially bonded while leaving a non-bonded portion due to the gap.