JPH07117162A - Heat-resistant structure - Google Patents

Abstract

PURPOSE:To provide a heat-resistant honeycomb structure which does not generate the thermal stress due to expansion and shrinkage by dispensing with the brazing between the flat and corrugated plates constituting a cylindrical honeycomb member and the brazing between the honeycomb member and its case. CONSTITUTION:A plurality of thin metal strips having the same length, each having a corrugated side 1b and a flat side 1a, are superposed in such a manner that the corrugated side of one strip meets the flat side of another. The superposed strips are pressed and spot-welded to form a parallel part 2 in the middle and they are wound around the parallel part to form a cylindrical honeycomb member 4. This honeycomb member is enclosed in a case 5 and provided with two L-shape stopper materials 3, which have corresponding arms 3a welded to the respective sides of the parallel part 2 and the other arms 3b extending diametrically in opposite directions and welded to the end edges of the case 5. Two annular stopper rings 6 are welded to the inside of the case at both end parts to prescribe the relative position of the honeycomb member and the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat resistant structure, and more particularly to a heat resistant structure used in an exhaust gas purifying apparatus for an internal combustion engine formed in a cylindrical honeycomb body.

[0002]

2. Description of the Related Art A heat-resistant structure, which is a metal carrier for a catalyst device used in a conventional exhaust gas purifying apparatus, is formed by stacking a band-shaped flat plate and a corrugated plate and winding them in a roll to form a honeycomb body. It is known that the body is housed in a metal outer cylinder (for example, JP-A-56-4373).
In this heat-resistant structure, a brazing filler metal is usually interposed between the flat plate and the corrugated plate constituting the honeycomb body, and the outer cylinder and the honeycomb body, and the brazing filler metal is melted by using a high vacuum furnace to perform liquid phase diffusion bonding. The joints were joined by.

[0003]

The heat-resistant structure which is the above-mentioned conventional metal carrier for a catalyst device has a brazing material interposed between a flat plate and a corrugated plate when a honeycomb body is formed, and is formed into a roll shape. Since it is wound around and bonded, the flat plate and the corrugated plate are integrally bonded at the bonding portion. Further, the outer cylinder that covers the honeycomb body is also joined by the brazing material, so that the entire joint structure constitutes a rigid joint structure.

In the catalyst metal carrier, the flow velocity of the exhaust gas passing through the honeycomb body is higher from the outer peripheral portion to the central portion of the honeycomb body, so that contact with the hot exhaust gas, heat generation due to the catalytic reaction and the outer cylinder. Due to heat radiation from the outside to the outside air, a temperature distribution is generated in which the temperature is higher in the central part and lower in the outer peripheral part, and the difference in the temperature distribution causes a difference in expansion and contraction amount between the honeycomb body and the outer cylinder. The radial and axial movements of the honeycomb body are restricted by the outer cylinder, and the plate thickness of the flat plate and the corrugated plate forming the honeycomb body is generally considerably smaller than the plate thickness of the outer cylinder. Since it is rigidly bonded, thermal stress acts on the honeycomb body. Then, due to repeated expansion and contraction, the corrugated plate on the outermost periphery of the honeycomb body causes plastic deformation to cause metal fatigue, and finally, the corrugated plate of the honeycomb body is broken and at the joint portion between the honeycomb body and the outer cylinder. There is a drawback that peeling occurs.

An object of the present invention is that no thermal stress is generated between the flat plate and the corrugated plate constituting the honeycomb body and between the honeycomb body and the outer cylinder, and the manufacturing is easy and the cost can be reduced. It is to provide a heat-resistant structure forming a honeycomb body.

[0006]

The heat resistant structure of the present invention comprises:
In a heat-resistant structure including an outer cylinder and a roll-shaped honeycomb body inserted in the outer cylinder, a predetermined corrugation is provided on one side of a strip-shaped thin flat plate having a constant length as a boundary. Then, a plurality of base materials that remain flat on the other side are alternately superposed by a predetermined number so that the corrugation on one side and the flat plate on the other side come into contact with each other, and are joined after being pressed in the central portion, A cylindrical honeycomb body having an elongated parallel portion perpendicular to the longitudinal direction of the base material and wound around the parallel portion, an outer cylinder covering the honeycomb body, and between the outer cylinder and the honeycomb body. And positioning means provided.

In a preferred form of the heat-resistant structure of the present invention, the positioning means is fixed to the parallel portions so that one side of each of the two L-shaped elongated plate members faces each other across the parallel portion, and the other side. Stopper material fixed to the end edge of the outer cylinder extending in a straight line in the opposite direction to each other, at both end surfaces of the honeycomb body, respectively inscribed and fixed to the outer cylinder with a predetermined gap from the end surface, One or more provided with two annular stopper rings or provided on both end faces of the honeycomb body with a predetermined gap from each end face, and both end portions joined to the end edge of the outer cylinder. Or an elongated rod-shaped member, or two annular stopper rings internally fixed to the outer cylinder at both end surfaces of the honeycomb body with predetermined clearances between the end surfaces and the end surfaces and predetermined clearances, respectively. Are separated by And both end portions are joined to the stopper ring has one or more elongated rod-like member.

[0008]

[Function] A plurality of base materials each having a corrugated portion except for the central portion of a flat plate having a certain length and having a corrugated shape are overlapped by abutting the corrugated portion and the flat plate portion on each other, and the central portion is used as a base. A parallel surface is formed by pressing with a slender surface that is perpendicular to the longitudinal direction of the material, and the base material is wound in two toe-like shapes around the parallel surface to form a cylindrical honeycomb body. Since the structure is formed by coating and further joining with the honeycomb body through the stopper, it is not necessary to join the flat plate and the corrugated plate and between the honeycomb body and the outer cylinder with a brazing material, and therefore the honeycomb body Also, a structure can be obtained in which thermal stress is not generated between the honeycomb body and the outer cylinder.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 (A) is a schematic cross-sectional view perpendicular to the axis of an embodiment of the heat-resistant structure of the present invention, FIG. 1 (B) is a schematic cross-sectional view in the axial direction of FIG. 1 (A), and FIG. 2 is a honeycomb substrate. FIG. 3 is a schematic explanatory view of the cross section of FIG. 3, and FIG. 3 is a schematic cross sectional view showing the central portion of the superposed substrates.

In FIG. 1, the honeycomb body 4 is formed by a flat plate 1a and a corrugated plate 1b. As shown in FIG. 2, a plurality of base materials 1 each having a corrugated shape are formed on a portion 1d on one side except a central portion 1c of a thin flat plate 1a having a band-like shape and a corrugated plate 1
The central portion 1 of the base material 1 in which a predetermined number of sheets are alternately laminated so that the portion b and the portion of the flat plate 1a are in contact with each other
As shown in FIG. 3, c is pressed from above and below by a long and narrow surface perpendicular to the longitudinal direction of the base material, and the central portion 1c of all the base materials is pressed.
And the parallel portion 2 is formed. The parallel portion 2 is joined by spot welding or the like. Next, as shown in FIG. 1, one side 3a of the two stopper materials 3 obtained by processing an elongated plate material into an L shape is joined by spot welding at a right angle to the longitudinal direction of the base material in the parallel portion 2, and the other side. The sides 3b are arranged so as to be opposite to each other and form a straight line.

The predetermined number of base materials thus formed are
Cylindrical honeycomb body 4 wound around the parallel portion 2
To form. The outer cylinder 5 slightly longer than the entire length of the honeycomb body 4 in the axial direction covers the outside of the honeycomb body 4. The end portion of the other side 3b of the stopper material 3 is welded to the end edge 5a of the outer cylinder 5 to define the circumferential and axial relative positions of the honeycomb body 4 and the outer cylinder 5. An annular stopper ring 6 that is inscribed in the outer cylinder 5 is provided on both end faces of the honeycomb body 4 at the end face 4
The heat resistant structure 10 is formed by spot welding to the outer cylinder 5 with a predetermined gap t from b. Stopper ring 6
May be welded to the outer cylinder 5 before the other side 3b of the stopper material 3. The size of the gap t is set to a size that can cope with the expansion in the axial direction due to the thermal expansion of the honeycomb body 4.

Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a schematic sectional view in the axial direction of this embodiment.

As in the case of the embodiment of FIG. 1, as shown in FIG. 3, after pressing a central portion 1c of a predetermined number of base materials to bring them into close contact, a parallel portion 2 is formed and joined by spot welding or the like. The honeycomb body 4 is formed by winding around the parallel portion 2. The outer side of the honeycomb body 4 is covered with an outer cylinder 5 which is slightly longer than its entire length. As a positioning means, FIG.
As shown in FIG. 3, an annular stopper ring 6 ′ that is inscribed in the outer cylinder 5 is spot-welded to the outer cylinder 5 on both end surfaces 4 b of the honeycomb body 4 with a predetermined gap t from the end surfaces. . The size of the gap t is set to a size that can cope with the expansion in the axial direction due to the thermal expansion of the honeycomb body 4. The rod-shaped elongated stopper material 3'is arranged along the both end surfaces 4b of the honeycomb body 4 with a predetermined gap t from the end surfaces, and both ends of the stopper material 3'are joined to the stopper ring 6'by welding so that heat resistance is improved. The structure 10 'is formed. The number of stopper materials 3'can be any number of one or more. Also, stopper material 3 '
The shape of can be appropriately selected from a long rod shape, a branch shape, a cross shape, and the like. Further, notches may be provided in the stopper ring 6'to support both ends of the stopper material 3'and then fixed by welding.

As a further embodiment, the stopper ring 6'in the above-mentioned embodiment may be eliminated and only the stopper material 3'joined by welding both ends directly to the outer cylinder 5 may be provided as a positioning means. it can.

In this way, the honeycomb body 4 is formed,
Furthermore, when the honeycomb structure 4 and the outer cylinder 5 are combined to form the heat resistant structures 10 and 10 ', they can be formed without using a brazing material.

[0016]

As described above, according to the present invention, a plurality of base materials each having a corrugated plate on one side of a strip-shaped flat plate having a constant length are brought into contact with each other. Superimposing them, pressing the central part of the base material and joining them together, and winding them around the central part to form a cylindrical honeycomb body, which is covered with an outer cylinder, and stopper means is provided between the honeycomb body and the outer cylinder. Since the structure is formed without using a brazing filler metal, thermal stress due to expansion and contraction does not occur between the flat plate and the corrugated plate of the honeycomb body and between the honeycomb body and the outer cylinder, and the vacuum furnace is Since it is not used, there is an effect that a heat resistant structure can be obtained which is easy to manufacture and saves cost.

[Brief description of drawings]

1 (A) is a schematic cross-sectional view perpendicular to the axis of an embodiment of a heat-resistant structure of the present invention, and FIG. 1 (B) is a schematic cross-sectional view in the axial direction of FIG. 1 (A).

FIG. 2 is a schematic explanatory view of a cross section of a base material of a honeycomb body.

FIG. 3 is a schematic cross-sectional view showing a central portion of superposed substrates.

FIG. 4 is a schematic axial cross-sectional view of another embodiment of the heat-resistant structure of the present invention.

[Explanation of symbols]

 1 Base material 1a Flat plate 1b Corrugated plate 1c Central part 1d One side part 2 Parallel part 3, 3'Stopper material 3a One side 3b The other side 4 Honeycomb body 4b End surface 5 Outer cylinder 5a End edge 6, 6'Stopper ring 10 10 'heat-resistant structure t gap

Claims (4)

[Claims] 1. A heat-resistant structure including an outer cylinder and a roll-shaped honeycomb body inserted in the outer cylinder, wherein a strip-shaped thin flat plate having a constant length serves as a boundary.
A plurality of base materials having a predetermined waveform on one side and the other side being a flat plate, a predetermined number of sheets are alternately superposed such that the one side waveform and the other side flat plate are in contact with each other, Also, a cylindrical honeycomb body, which is joined after being pressed at the central portion, has a long and slender parallel portion in the longitudinal direction at the base material, and is wound around the parallel portion, and the honeycomb body A heat resistant structure comprising: an outer cylinder to be covered; and a positioning means arranged between the outer cylinder and the honeycomb body. 2. The positioning means is fixed to the parallel portions so that one side of each of the two L-shaped elongated plate members faces each other across the parallel portion, and the other sides are opposite to each other. A stopper member extending in a straight line and fixed to an end edge of the outer cylinder, and inwardly fixed to the outer cylinder at both end surfaces of the honeycomb body with predetermined gaps between the end surfaces. The heat resistant structure according to claim 1, further comprising an annular stopper ring. 3. The positioning means is disposed on both end faces of the honeycomb body with a predetermined gap from each end face, and both end portions are joined to an end edge of the outer cylinder.
The heat-resistant structure according to claim 1, comprising one or more elongated rod-shaped members. 4. The positioning means includes two annular stopper rings, which are internally fixed to the outer cylinder at both end surfaces of the honeycomb body, with a predetermined gap from the end surfaces, respectively, and the honeycomb body of the honeycomb body. The heat resistant structure according to claim 1, further comprising one or more elongated rod-shaped members, which are disposed on both end faces with a predetermined gap from the end faces and have both end portions joined to the stopper ring. .