JP3267376B2 - Method for manufacturing metal carrier for catalyst device and metal carrier for catalyst device manufactured by the manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal carrier for a catalyst device used in an exhaust gas purifier of an internal combustion engine, and more particularly to a metal carrier having a spirally formed honeycomb body.

[0002]

2. Description of the Related Art A metal carrier for a catalyst device used in a conventional exhaust gas purifier is formed by stacking a strip-shaped flat plate and a corrugated plate and winding them spirally to form a honeycomb body. What is stored in a cylinder is known (for example, JP-A-56-4373). In this metal carrier, the outer diameter of the honeycomb body inserted into the outer cylinder is equal to or smaller than the inner diameter of the outer cylinder, or as disclosed in Japanese Patent Application Laid-Open No. H4-180839. A method of contracting the outer cylinder after inserting the body into the outer cylinder has been adopted.

[0003]

In the above-described conventional metal carrier, if the honeycomb body inserted into the outer cylinder is made to have the same inner size as the outer cylinder, it is difficult to insert the honeycomb body. It is easy to create a gap between the outer cylinder and the honeycomb body to reduce the volume of the brazing material due to brazing, and if the honeycomb body is smaller than the inner size of the outer cylinder to facilitate insertion, There is a disadvantage that a larger gap is generated between the honeycomb bodies and the honeycomb bodies are loosened. In order to prevent the occurrence of a gap between the honeycomb body and the outer cylinder, a method of contracting the outer cylinder by a press after insertion is performed. It has the disadvantage of requiring equipment.

An object of the present invention is to provide a novel metal carrier for a catalytic device in which no gap is formed between the outer cylinder and the honeycomb body, and a method for producing the same.

[0005]

According to the present invention, there is provided a method for producing a metal carrier for a catalyst device, comprising forming a thin and long strip-shaped flat metal sheet and a strip-shaped corrugated sheet into a multi-layer spiral shape, and forming a multi-layer spiral between the layers. A honeycomb body having a mesh-shaped ventilation path is formed, and a groove-shaped concave portion parallel to the axis of the honeycomb body is provided on the outer surface of the honeycomb body within the elastic limit of the flat plate and the corrugated plate to reduce the outer diameter of the honeycomb body. After the honeycomb body is inserted into the cylindrical outer cylinder having an inner diameter that fits through the reduced outer diameter and a small gap with the reduced outer diameter, the outer cylinder and the honeycomb body are tightly fitted by the restoring force of the concave portion. Either a metal carrier is formed as a state, or a honeycomb body is formed by the same method as described above, and a flat metal plate is formed into a cylindrical body having an inner diameter that fits through a small gap with the outer diameter of the honeycomb body. Formed between the axial edges of the cylindrical body The gap is provided, the honeycomb body is inserted into the cylindrical body, and in the direction in which the two edges abut, a cutting force in a direction perpendicular to the axis is applied to the side surface of the cylindrical body, and on the outer surface of the honeycomb body, This is a method of forming a metal carrier by forming a groove-shaped recess parallel to the axis within the elastic limit, abutting the edges, and joining the edges.

The metal carrier for a catalyst device formed by the production method of the present invention is formed in a multi-layer spiral shape by superposing a thin strip-shaped thin metal plate and a strip-shaped corrugated plate, and forming a multi-layered spiral between the layers. The axis of the honeycomb body provided between the honeycomb body having the ventilation path and the outer cylinder coaxially arranged on the outer surface of the honeycomb body within the elastic limit of the flat plate and the corrugated plate on the outer surface of the honeycomb body By the action of a groove-shaped concave portion parallel to the above, it is formed in an interference fit state, or a cylindrical outer shape in which the inner diameter is formed smaller than the outer diameter of the honeycomb body made in the same manner as described above. The honeycomb body is formed so as to be press-fitted in the tube.

[0007]

The outer surface of the honeycomb body is provided with a groove-shaped recess parallel to the axis of the honeycomb body by an external force, and the honeycomb body is fitted to the outer cylinder having an inner diameter that fits through a slight gap with the outer diameter of the honeycomb body. After the housing, if the external force forming the concave portion is removed, the outer diameter of the honeycomb body is restored by the elasticity of the concave portion, and the space between the outer cylinder and the honeycomb body is tightly fitted.

Further, the honeycomb body is housed in an outer cylinder having a gap between the axial edges, and a cutting force is applied to the outer cylinder to abut the gap to form an axial groove-shaped groove on the outer surface of the honeycomb body. When the concave portion is formed and the abutting portion is joined, the outer diameter of the honeycomb body is restored by the elasticity of the concave portion, so that the honeycomb body is pressed into the outer cylinder.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of a first embodiment of a metal carrier for a catalyst device of the present invention in a direction perpendicular to an axis of a honeycomb body. In FIG. 1 (B), the honeycomb body 1 is formed in a spiral shape by superposing a thin strip-shaped flat metal plate 2 and a strip-shaped corrugated plate 3 on each other. The outer surface of the honeycomb body 1 is pressed by an external force (not shown) to form a groove-shaped recess 4 parallel to the axis of the honeycomb body.
By forming the honeycomb body 1 'as shown in FIG. 1A, the outer diameter of the honeycomb body 1 is reduced.
The recess 4 is formed by the flat plate 2 and the corrugated plate 3 on the outer side of the honeycomb body 1.
Are formed within the elastic limit. Cylindrical outer cylinder 5
Is a dimension that fits through a small gap with the reduced outer diameter of the honeycomb body 1 '. After the honeycomb body 1 'is housed in the outer cylinder 5 and the external force pressing the recess 4 is removed, the reduced outer diameter of the honeycomb body 1' is
Due to the restoring force due to the elasticity of the flat plate 2 and the corrugated plate 3 forming the recess 4, the outer diameter of the outer cylinder 5 and the honeycomb body 1 ′ are tightly fitted to return to the original outer diameter of the honeycomb body 1. State. Therefore, the metal carrier 10 is formed integrally without forming a gap between the honeycomb body 1 'and the outer cylinder 5 even after brazing.

In the second embodiment of the present invention, as shown in FIG. 2A, a metal flat plate is formed on a cylindrical body 6 so as to cover the outside of the honeycomb body 1 shown in FIG. The inner diameter A is fitted to the diameter through a slight gap, and the gap g between the axial edges 7 of the cylindrical body 6 is set to a predetermined size. Cylindrical body 6
After the honeycomb body 1 is inserted into the inside, when a cutting force T perpendicular to the axis is applied to the side surface of the cylindrical body 6, the outer diameter of the honeycomb body 1 is reduced, and finally, as shown in FIG. Concave 4 '
Are formed parallel to the axis on the outer surface of the honeycomb body to form the honeycomb body 1 ". At this time, the edges 7 abut each other and the gap g disappears. When the abutted edges 7 are joined, the outer cylinder is formed. The gap g is provided in advance so that the concave portion 4 'is formed within the elastic limits of the flat plate and the corrugated plate of the honeycomb body 1 ", so that the outer cylinder 5' is formed. After that, by the restoring force due to the elasticity of the flat plate and corrugated plate,
The honeycomb body 1 ″ always exerts an internal pressure on the outer cylinder 5 ′,
It is in a state of being pressed into the outer cylinder 5 '. Therefore, similarly to the first embodiment, the metal carrier 10 'is formed integrally without forming a gap between the honeycomb body 1 "and the outer cylinder 5' even after brazing.

[0011]

As described above, the metal carrier of the present invention is provided with a groove-shaped concave portion parallel to the axis within the elastic limit on the outer surface of the honeycomb body accommodated in the outer cylinder, and the concave portion is restored by elasticity. Since the honeycomb body and the outer cylinder are tightly fitted by the force, there is an effect that no gap is formed between the honeycomb body and the outer cylinder even after brazing.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a first embodiment of the present invention in a direction perpendicular to an axis of a honeycomb body. FIG.
(B) shows the configuration of the honeycomb body.

FIG. 2A is a schematic perspective view of a cylindrical body, and FIG. 2B is a schematic plan view in a direction perpendicular to an axis of a honeycomb body in a second embodiment of the present invention.

[Explanation of symbols]

 1, 1 ', 1 "honeycomb body 2 flat plate 3 corrugated plate 4, 4' concave portion 5, 5 'outer cylinder 6 cylindrical body 7 edge 10, 10' metal carrier A inner diameter g gap T cutting force O axis

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01J 21/00-37/36 B01D 53/86 F01N 3/28

Claims (2)

(57) [Claims] An elongated strip of thin metal and a strip of corrugated sheet are superimposed to form a multi-layer spiral shape, and a honeycomb body having a number of mesh air passages between the layers is formed. On the outer side surface, within the elastic limits of the flat plate and the corrugated plate, a groove-shaped concave portion parallel to the axis of the honeycomb body is provided to reduce the outer diameter of the honeycomb body, and a small gap with the reduced outer diameter is provided. After inserting the honeycomb body into a cylindrical outer cylinder having an inner diameter that fits through, the restoring force of the concave portion causes the outer cylinder and the honeycomb body to be tightly fitted to each other. Production method. 2. An elongated strip of thin metal and a strip of corrugated sheet are superimposed to form a multi-layer spiral, and a honeycomb body having a number of mesh-shaped air passages between the layers is formed. Forming a cylindrical body having an inner diameter that fits through a slight gap with the outer diameter of the honeycomb body; providing a predetermined gap between axial edges of the cylindrical body; A honeycomb body is inserted, and a cutting force in a direction perpendicular to an axis is applied to a side surface of the cylindrical body in a direction in which the edges abut, and a groove parallel to an axis within an elastic limit is formed on an outer surface of the honeycomb body. A method for producing a metal carrier for a catalyst device, comprising: forming a concave portion having a shape, abutting the edges, and then joining the edges.