JP2591675Y2 - Catalyst carrier support structure for manifold catalytic converter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst carrier supporting structure for a manifold catalytic converter used for purifying exhaust gas and the like.

[0002]

2. Description of the Related Art In general, a catalytic converter is mounted in an exhaust system of an automobile to purify exhaust gas, and the catalytic converter removes unburned components such as a CO component and a HC component in the exhaust gas. Is done. In the catalytic converter, a metallic catalyst carrier is accommodated in a cylindrical container via a cap. For example, an underfloor type catalytic converter disclosed in Japanese Utility Model Laid-Open No. 2-3015 is known. In addition, since the manifold catalytic converter disposed immediately downstream of the exhaust manifold from the exhaust manifold takes a substantially vertical posture, for example, those shown in FIGS. 4 and 5 are known as a catalyst carrier supporting structure of the manifold catalytic converter.

In FIG. 1, a manifold catalytic converter 21 is directly connected to an exhaust manifold of a multi-cylinder engine (not shown) (described later), and is disposed substantially perpendicular to an exhaust system. Tubular container 22 of manifold catalytic converter 21
Has an upstream diffuser (not shown), a downstream diffuser (not shown), and a body portion 23 continuous between the upstream diffuser and the downstream diffuser. A ceramic catalyst carrier 24 is accommodated in the body 23 of the cylindrical container 22.

The inner wall surface 2 of the body 23 of the cylindrical container 22
A gap 25 is formed between 3A and the side surface 24D of the catalyst carrier 24. A holding member 26 and a foamable sealing material 27 (trade name: Intramat) are arranged in the gap 25. The foamable sealing material 27 prevents the exhaust gas from being bypassed.

[0005] An upstream side annular cap 28 is provided upstream of the catalyst carrier 24 in the body 23 of the cylindrical container 22.
It is located on the outer periphery of the front end 24B of the side surface 24D of the body 24 . The upstream side annular cap 28 has a U-shaped cross section.
And formed on the outer cylindrical portion 28A and the outer cylindrical portion 28A.
The catalyst carrier 24 extends continuously inward in the radial direction.
And an annular portion 29 facing the edge surface 24A of the
9 and in parallel with the outer cylindrical portion 28A.
And an inner cylindrical portion 28B shorter than the side cylindrical portion 28A.
Outer cylindrical portion 28 of upstream annular cap 28 in cylindrical container 22
A is fixed by plug welding S3. In addition, the upstream annular key
An upstream buffer member 30 made of a washer wire mesh is provided in the cap 28, and the upstream buffer member 30 holds an edge surface 24 < / b> A of the catalyst carrier 24.

On the other hand, on the downstream side of the catalyst carrier 24, a downstream annular cap 31 is provided inside the body 23 of the cylindrical container 22.
24 are located on the outer periphery of the rear end 24C of the side surface 24D . The downstream side annular cap 31 has a U-shaped cross section.
Formed, like the upstream annular cap 28,
It has a tubular portion 31A, an inner tubular portion 31B, and an annular portion 32
ing. Outside the downstream side annular cap 31 in the cylindrical container 22
The cylindrical portion 31A is fixed by plug welding S4. Also downstream
A downstream buffer member 33 made of a washer wire mesh is provided in the side annular cap 31 , and the downstream buffer member 33 holds an end surface 24 </ b> E of the catalyst carrier 24.

In the manifold catalytic converter 21 configured as described above, exhaust gas flows into the cylindrical container 22 and is purified while passing through the catalyst carrier 24.

[0008]

However, in the conventional catalyst carrier support structure of the manifold catalytic converter 21, the body portion 23 of the cylindrical container 22 is provided inside the cylindrical container 22.
The catalyst carrier 24 is accommodated so as to form a gap 25 between the inner wall surface 23A and the side surface 24D, and the gap 25 has a minimum size sufficient for mounting the holding member 26 and the foamable sealing material 27. Therefore, the distance from the inner wall surface 23A of the body portion 23 of the cylindrical container 22 to the side surface 24D of the catalyst carrier 24 is short, and the outer cylindrical portion 28A of the upstream annular cap 28 and the outer cylindrical portion 31A of the downstream annular cap 31 are smaller. Plug welding S3
The back bead of the weld metal formed in S4 is
Collides with the side face 24D of the catalyst carrier 21 due to the vibration of the manifold catalytic converter 21 or the like, so that the side bead 24D of the weld metal destroys the side face 24D of the catalyst carrier 24, and the efficiency of purifying the exhaust gas is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a stopper for a tubular portion of an annular cap.
The back bead of the weld metal formed by welding so as not to collide with the side surface of the catalyst support, to provide a catalyst carrier support structure of the manifold catalytic converter can be prevented from destroying the side of the catalyst carrier at the back bead of the weld metal It is.

[0010]

SUMMARY OF THE INVENTION The present invention provides a cylindrical container,
In this tubular container, a catalyst carrier housed so as to form a gap between the inner wall surface and the side surface of the body portion of the tubular container,
Located in the outer periphery of the side edge of the catalyst carrier located in the cylindrical container
Outer cylindrical part, and radially inner
Ring extending toward the edge of catalyst support
An annular cap having a portion, and a buffer member provided in the annular cap and holding an edge surface of the catalyst carrier ,
The outer cylindrical part of the annular cap is fixed to the cylindrical container by plug welding
In the above-described manifold catalytic converter, a first-stage portion and a second-stage portion are provided from the body of the cylindrical container near the outer cylindrical portion of the annular cap to be plug-welded to the cylindrical container.
To form a stepped bulge having a bulge protruding outward.
And the annular cap inside the stepped bulge.
The outer cylindrical portion of the loop is disposed .

[0011]

In the present invention, the body portion of the cylindrical container is provided near the outer cylindrical portion of the annular cap to be plug-welded.
Bulge projecting outward from the first through the first step and the second step
In the stepped bulging portion, the distance from the inner wall surface of the cylindrical container to the side surface of the catalyst carrier was increased, and the stepped bulging portion was formed by plug welding to the outer cylindrical portion of the annular cap. The back bead of the weld metal does not collide with the side surface of the catalyst support.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 3 show a structure for supporting a catalyst carrier of a manifold catalytic converter according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a manifold catalytic converter according to an embodiment of the present invention. This manifold catalytic converter 1 is directly connected to an exhaust manifold of a multi-cylinder engine (not shown) (to be described later), and is substantially connected to an exhaust system. It is arranged vertically.

The cylindrical vessel 2 of the manifold catalytic converter 1 has an upstream diffuser (not shown), a downstream diffuser (not shown), and a body 3 continuous between the upstream diffuser and the downstream diffuser. And The body 3 is formed by half-joining the half cases 3A, 3A, and a catalyst carrier 4 made of ceramic is accommodated in the body 3.

A gap 5 is formed between the inner wall surface 3 B of the body 3 of the cylindrical container 2 and the side surface 4 D of the catalyst carrier 4. The holding member 6 and the foamable sealing material 7
(Product name: Intramat). The foamable sealing material 7 prevents the exhaust gas from bypassing.

Then, the upstream side annular cap is placed in the cylindrical container 2.
Is disposed. The upstream side annular cap 8 carries a catalyst.
It is located on the outer periphery of the front end 4B of the side surface 4D of the body 4. Up
The flow-side annular cap 8 is formed to have a U-shaped cross section,
Part 8A and this outer cylindrical part 8A and inward in the radial direction.
A ring extending and facing the edge surface 4A of the catalyst carrier 4
Shape portion 9 and the outer cylindrical portion 8A continuously with the annular portion 9.
An inner cylindrical portion 8B which is arranged in parallel and shorter than the outer cylindrical portion 8A;
have. The upstream cushioning member 11 is
Which is provided in the tip 8 and holds the edge surface 4A of the catalyst carrier 4.
You. Outer cylindrical portion 8A of upstream side annular cap 8 in cylindrical container 2
Are fixed by plug welding S1. Here, the cylindrical container 2
Is plug-welded to the outer cylindrical portion 8A of the upstream annular cap 8.
An upstream stepped bulge 10 is formed in the vicinity of
The side stepped bulging portion 10 extends from the body 3 of the cylindrical container 2
Projecting outward through the first step 10A and the second step 10B
It has a bulging portion 10C. Of the stepped bulge 10
The outer cylindrical portion 8A of the annular cap 8 is disposed on the side.
You.

An upstream buffer member 11 made of a washer wire mesh is provided in the upstream annular cap 8, and the upstream buffer member 11 holds the end surface 4 A of the catalyst carrier 4.

Then, the downstream annular cap is placed in the cylindrical container 2.
Is disposed. The downstream side annular cap 12 is
Located on the outer periphery of the rear end 4C of the side surface 4D of the medium carrier 4
You. The downstream side annular cap 12 has a U-shaped cross section.
As in the case of the upstream side annular cap 8, the outer cylindrical portion 12
A, an inner cylindrical portion 12B, and an annular portion 13.
The downstream buffer member 15 is provided in the downstream annular cap 12.
Then, the edge surface 4E of the catalyst carrier 4 is held. Cylindrical container
The outer cylindrical portion 12A of the downstream side annular cap 12 is plug-welded to 2.
It is fixed at S2. Here, the downstream side ring of the cylindrical container 2
In the vicinity of the outer cylindrical portion 12A of the cylindrical cap 12 to be plug-welded.
A downstream stepped bulge 14 is formed, and the downstream stepped bulge 14 is formed.
The swelling portion 14 is formed from the body portion 3 of the cylindrical container 2 to the first step portion 1.
4A, bulging portion 1 protruding outward through second step portion 14B
4C. The inside of the stepped bulging portion 14 is
An outer cylindrical portion 12A of the annular cap 12 is disposed.

A downstream buffer member 15 made of a washer wire mesh is provided in the downstream annular cap 12 , and the downstream buffer member 15 is attached to the end surface 4 E of the catalyst carrier 4.
Holding.

In the manifold catalytic converter 1 configured as described above, the exhaust gas flows into the cylindrical container 2 and is purified while passing through the catalyst carrier 4. According to the above configuration, the upstream side annular cap 8 of the cylindrical container 2 is
Outer tube portion 8A and outer tube portion 1 of downstream side annular cap 12
2A, the upstream stepped bulging portion 10 and the downstream stepped bulged portion 14 are directed toward the outside of the cylindrical container 2 near the plug welding.
Was formed, the catalyst carrier 4 was removed from the inner wall surface 3B of the body portion 3.
The distance to the side of 4D is long, the outer tube of the outer tubular portion 8A and the downstream annular cap 12 of the upstream annular cap 8
The back bead of the weld metal formed by plug welding in the portion 12A can be prevented from colliding with the side surface 4D of the catalyst carrier 4 due to vibration or the like.

Therefore, the side bead 4D of the weld metal is protected without breaking the side surface 4D of the catalyst carrier 4, and the purification efficiency of the exhaust gas can be kept high. Also, the upstream stepped bulging portion 10 and the downstream stepped bulging portion 14 of the cylindrical container 2 are provided.
The strength of the cylindrical container 2 is increased by the high temperature exhaust gas.
Has a shape that tends to be thermally deformed in the direction of its short diameter, but has an increased strength and is unlikely to undergo thermal deformation . This
To keep the sealing pressure of the foamable sealing material 7 as uniform as possible.
be able to.

In particular, the catalyst carrier 4 is securely held by the downstream side annular cap 12, and its falling can be prevented. In this embodiment, the cylindrical container 2 has an upstream stepped expansion.
The projecting portion 10 and the downstream stepped bulging portion 12 are respectively formed, but the upstream stepped bulging portion 10 and the downstream stepped bulging are provided.
At least one of the portions 12 may be formed.

[0023]

[Effects of the Invention] As described above, according to the present invention,
A first step and a second step are carried out from the body of the cylindrical container to the vicinity of the cylindrical container where the outer cylindrical portion of the annular cap is plug-welded.
As a result, a stepped bulging portion having a bulging portion protruding outward is formed.In the stepped bulging portion , the distance from the inner wall surface of the cylindrical container to the side surface of the catalyst carrier becomes longer, and the annular cap has Outside
The back bead of the weld metal formed on the side tube portion can be prevented from colliding with the side surface of the catalyst carrier.

Therefore, the backside bead of the weld metal protects the side surface of the catalyst carrier without breaking it, and can maintain high exhaust gas purification efficiency. Further, an upstream side of the cylindrical container,
The stepped swelling portion and the stepped swelling portion on the downstream side increase in strength, and the high temperature exhaust gas tends to thermally deform the cylindrical container in the short diameter direction. The shape is less likely to occur . This allows the foaming seal
The sealing pressure of the material can be kept as uniform as possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of a manifold catalytic converter according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a side view of the manifold catalytic converter.

FIG. 4 is a sectional view of a conventional manifold catalytic converter.

FIG. 5 is an enlarged view of a portion B in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Manifold catalytic converter 2 Cylindrical container 3 Body part 3B Inner wall surface 4 Catalyst carrier 4A End surface 4B Front end 4C Rear end 4D Side 4E End surface 5 Gap 8 Upstream annular cap 8A Outer cylinder 8B Inner cylinder 9 Annular portion 10 Upstream stepped bulging portion 11 Upstream buffering member 12 Downstream annular cap 12A Outer cylindrical portion 13 Annular portion 14 Downstream stepped bulging portion 15 Downstream buffering member S1 Plug welding S2 Plug welding

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical container (2), and a body portion of the cylindrical container (2) in the cylindrical container (2).
(3) of the inner wall surface (3B) and the side surface and the catalyst carrier (4) which is accommodated so as to form a gap (5) between the (4D), the catalyst support is located in the cylindrical container (2) in (4) Side edge
Outer cylindrical portions (8A, 12A) arranged on the outer periphery of
Extends radially inward continuously to the outer cylindrical portions (8A, 12A).
The edge surface (4A, 4E) of the catalyst support (4) while extending
Annular cap having annular portions (9, 13) opposed to
(8, 12) and a cushioning member (1) provided in the annular cap (8 , 12) and holding the edge surfaces (4A, 4E) of the catalyst carrier (4).
1, 15), and the cylindrical container (2) is provided outside the annular cap (8, 12).
Side tube parts (8A, 12A) are fixed by plug welding (S1, S2)
In the above-described manifold catalytic converter, the cylindrical container (2) is provided outside the annular caps (8, 12).
Side tube portion (8A, 12A) and in the vicinity of the plug welded, tubular
From the body (3) of the container (2) to the first step (10A, 14)
A), projecting outward through the second step portion (10B, 14B)
Stepped bulging portion having bulging portions (10C, 14C)
(10, 14) and the stepped bulge
The annular cap (8, 12) inside the (10, 14)
A catalyst carrier supporting structure for a manifold catalytic converter , wherein outer cylindrical portions (8A, 12A) of the above are arranged .