JP2549143Y2 - Metal 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 metal catalytic converter mounted on an automobile, an industrial vehicle or the like for purifying exhaust gas.

[0002]

2. Description of the Related Art In general, a catalytic converter as disclosed in Japanese Utility Model Laid-Open Publication No. 2-39522 is provided in an exhaust system of an automobile for purifying exhaust gas.
FIG. 5 shows an example of this type of metal catalytic converter. In the figure, reference numeral 11 denotes a cylindrical outer cylinder made of a metal such as stainless steel, for example. The catalyst carrier 13 is accommodated, and the metal catalyst carrier 13
Is brazed to the inner surface of the outer cylinder 11.

As shown in FIG. 6, for example, the metal catalyst carrier 13 is formed by alternately stacking metal corrugated plates 15 and flat plates 17 and winding these in a circular shape in multiple layers. In addition, before and after the outer cylinder 11 containing the metal catalyst carrier 13, for example, a throttle tube 1 made of metal such as stainless
One end openings of 9 and 21 are fixed by welding 23.

Further, a flange 25 for connecting the throttle pipes 19, 21 to an exhaust pipe (not shown) is formed at the other end opening of the throttle pipes 19, 21. In the above-described metal catalytic converter, the exhaust gas from the exhaust pipe flows into the front throttle pipe 19, is purified while passing through the metal catalyst carrier 13, and flows out through the rear throttle pipe 21. Thereafter, for example, it is guided to a silencer or the like, and after being silenced, discharged to the outside.

FIG. 7 shows another example of a conventional metal catalytic converter. In this example, caps 27 having an L-shaped cross section are fitted on both ends of a metal catalyst carrier 13. The cap 27 is fixed to the cylindrical container 29 by welding.

[0006]

However, in the metal catalytic converter as shown in FIG. 5, since the metal catalyst carrier 13 is brazed to the inner surface of the outer cylinder 11, the outer cylinder 1
1 and the metal catalyst carrier 13, the outer cylinder 1
1 and a large amount of thermal stress acts between the metal catalyst carrier 13 and
There is a problem that the brazing may come off.

[0007] In a metal catalytic converter as shown in FIG.
Since the metal catalyst carrier 3 is located, there is a problem that the metal catalyst carrier 13 moves in the axial direction due to vibration or the like, collides with the cap 27, and the end of the metal catalyst carrier 13 may be deformed.
The present invention has been made to solve such a conventional problem, and a metal catalyst converter capable of reliably holding a metal catalyst carrier that is thermally deformed and eliminating deformation of an end of the metal catalyst carrier. The purpose is to provide.

[0008]

The metal catalyst converter according to the present invention is a metal catalyst converter comprising a metal catalyst carrier housed in a cylindrical container, wherein an annular member is fitted to an intermediate portion of the metal catalyst carrier. The inner peripheral surface of the annular member is
With brazed to the outer peripheral surface of the metal catalyst carrier, in which the outer peripheral surface of the annular member formed of a fixed to the inner peripheral surface of the cylindrical container.

[0009]

According to the metal catalyst converter of the present invention, at least the thermal deformation of both ends of the metal catalyst carrier does not affect the annular member, and the thermal stress generated between the annular member and the metal catalyst carrier is reduced.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 shows an embodiment of a metal catalytic converter according to the present invention. In the drawing, reference numeral 31 denotes a cylindrical tubular container made of a metal such as stainless steel.

The cylindrical container 31 is formed by welding a half body having a semicircular cross section, and a metal catalyst carrier 33 is accommodated in the cylindrical container 31. This metal catalyst carrier 33 is
It is formed by alternately stacking metal corrugated plates and flat plates, and winding these in a circular shape in multiple layers. In addition, before and after the cylindrical container 31 that accommodates the metal catalyst carrier 33, a throttle unit 3 is provided.
5, 37 are formed.

A flange portion 39 for connecting the throttle portions 35, 37 to an exhaust pipe (not shown) is fixed to the opening portions at the distal ends of the throttle portions 35, 37 by welding. In this embodiment, in the middle part of the metal catalyst carrier 33, as shown in FIG.
A pair of annular members 41 are fitted. These annular members 41 are fixed to the outer periphery of the metal catalyst carrier 33 by brazing.

On the other hand, as shown in FIG. 1, the cylindrical container 31 has an annular concave portion 45 in which a through hole 43 for welding is formed at a position where these annular members 41 are arranged. I have. The annular member 41 is disposed in the annular recess 45, and is fixed to the cylindrical container 31 by welding 47 from the outside of the cylindrical container 31 through the through hole 43.

In the metal catalytic converter configured as described above, the exhaust gas from the exhaust pipe flows into the front throttle section 35, is purified while passing through the metal catalyst carrier 33, and is purified by the rear throttle section. 37, and then, for example, guided to a silencer or the like, and after being silenced, discharged to the outside. Thus, in the metal catalyst converter configured as described above, a pair of annular members 41 are fitted and fixed to the intermediate portion of the metal catalyst carrier 33 at predetermined intervals in the axial direction, and these annular members are fixed. Since the member 41 is fixed to the inner peripheral surface of the cylindrical container 31, the metal catalyst carrier 33 that is thermally deformed can be reliably held, and the deformation of the end of the metal catalyst carrier 33 can be eliminated.

That is, in the metal catalytic converter configured as described above, the pair of annular members 41 are fitted and fixed to the intermediate portion of the metal catalyst carrier 33, so that the position between the pair of annular members 41 is small. Only the thermal deformation of the metal catalyst carrier 33 that acts on the pair of annular members 33 reduces the thermal stress acting between the annular member 41 and the metal catalyst carrier 33. The risk that the brazing between the metal catalyst carrier 33 and the metal catalyst carrier 33 will be peeled off can be significantly reduced, and the metal catalyst carrier 33 that is thermally deformed can be reliably held.

Further, in the metal catalytic converter configured as described above, it is not necessary to dispose the cap as shown in FIG. 7, so that the deformation of the end of the metal catalyst carrier due to the cap can be eliminated. Further, in the metal catalytic converter configured as described above, the annular concave portion 45 is formed in the cylindrical container 31, so that the positioning of the metal catalyst carrier 33 in the cylindrical container 31 becomes very easy.

In the metal catalyst carrier 33 formed by brazing the corrugated sheet and the flat plate, the annular member 41 is fitted to the metal catalyst carrier 33 before the brazing, so that the corrugated sheet and the flat plate are brazed. At the time of attaching, the metal catalyst carrier 33 and the annular member 41 can be brazed, and the number of steps can be reduced. FIG. 3 shows another embodiment of the present invention. In this embodiment, as shown in FIG. 4, an annular member 41 is fitted to the middle part of the metal catalyst carrier 33.

The annular member 41 is fixed to the outer periphery of the metal catalyst carrier 33 by brazing. On the other hand, as shown in FIG.
A through hole 43 for welding is provided at a position where the annular member 41 is disposed.
An annular concave portion 45 in which is formed is formed.

The annular member 4 is inserted into the annular recess 45.
1 is disposed, and is fixed to the cylindrical container 31 by welding 47 from the outside of the cylindrical container 31 through the through hole 43. A support ring 51 having a U-shaped cross section is disposed on both sides of the metal catalyst carrier 33, and the outer periphery of the support ring 51 is fixed to the inner surface of the cylindrical container 31 by spot welding or the like.

In the support ring 51, for example, a wire made of metal such as stainless steel is knitted into a knitted shape.
A holding material 53 having sufficient elasticity is accommodated, and an inner surface of the holding material 53 is in contact with an outer peripheral portion of an end surface of the metal catalyst carrier 33. In the metal catalytic converter configured as described above, the annular member 41 is fitted and fixed to the intermediate portion of the metal catalyst carrier 33 and the annular member 41 is fixed to the inner peripheral surface of the cylindrical container 31. Both ends of the catalyst carrier 33 are in a free state where they are not restrained.
The thermal stress acting between the annular member 41 and the metal catalyst carrier 33 is reduced, and the possibility that the brazing between the annular member 41 and the metal catalyst carrier 33 is peeled off is reduced. Can be held.

Further, in the metal catalyst converter configured as described above, since both ends of the metal catalyst carrier 33 are held by the support ring 51 via the elastic holding material 53, the heat of the metal catalyst carrier 33 is The expansion can be effectively absorbed by the holding material 53, and deformation such as stepped abrasion of the end of the metal catalyst carrier 33 can be eliminated. In the above-described embodiment, an example in which the present invention is applied to the metal catalyst carrier 33 having a circular cross section has been described. However, the present invention is not limited to such an embodiment.
Needless to say, the present invention can be applied to a metal catalyst carrier having an elliptical cross section.

[0022]

As described above, in the metal catalytic converter of the present invention, an annular member is fitted and fixed to the intermediate portion of the metal catalyst carrier, and the annular member is fixed to the inner peripheral surface of the cylindrical container. Therefore, there is an advantage that the metal catalyst carrier that is thermally deformed can be reliably held and deformation of the end portion of the metal catalyst carrier can be eliminated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a metal catalytic converter of the present invention.

FIG. 2 is a perspective view showing a state where an annular member is fitted on the metal catalyst carrier of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the metal catalytic converter of the present invention.

FIG. 4 is a perspective view showing a state where an annular member is fitted on the metal catalyst carrier of FIG. 3;

FIG. 5 is a longitudinal sectional view showing an example of a conventional metal catalytic converter.

FIG. 6 is an explanatory view showing the metal catalyst carrier of FIG. 5;

FIG. 7 is a longitudinal sectional view showing another example of a conventional metal catalytic converter.

[Explanation of symbols]

 31 cylindrical container 33 metal catalyst carrier 41 annular member

Claims (1)

(57) [Scope of request for utility model registration] A metal catalyst carrier (3) is provided in a cylindrical container (31).
3) In the metal catalyst converter accommodating 3), an annular member (41) is fitted to an intermediate portion of the metal catalyst carrier (33), and an inner peripheral surface of the annular member (41) is supported by the metal catalyst.
With brazed to the outer peripheral surface of the body (33), the metal catalyst converter, characterized in that the outer peripheral surface of the annular member (41) formed of a fixed to the inner peripheral surface of the tubular container (31).