JPH0452421Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a catalytic converter, and more particularly, to a catalytic converter in which a plurality of catalyst carriers are arranged and housed in series in one casing.

(Prior art) Catalytic converters are installed in automobiles to purify engine exhaust gas, and they purify NOx,
In order to take measures against HC and CO, a dual type catalyst in which multiple catalyst carriers are arranged and housed in series in one casing is known, for example, as disclosed in Japanese Utility Model Application Publication No. 127418/1983. There is.

In such a dual-type catalytic converter, in order to suppress the increase in back pressure in the catalyst, a mixing section is formed with an interval between adjacent catalyst carriers, that is, between the front catalyst carrier and the rear catalyst carrier. is common.

(Problem to be solved by the invention) However, in this dual type catalytic converter, as a result of providing a space called a mixing section between adjacent catalyst carriers, there is a problem that the length becomes long. be.

Therefore, an object of the present invention is to shorten the length of a dual-type catalytic converter in which a plurality of catalyst carriers are arranged and housed in series in one casing.

(Means for Solving the Problems) The present invention provides a catalytic converter in which a plurality of catalyst carriers are arranged and housed in series in one casing. A recess that forms part of the mixing space is provided at the end on the other catalyst carrier side,
On the other hand, the catalyst carrier disposed at the end inside the casing is provided with a convex portion that protrudes from the cone portion of the casing.

(Operations and effects of the invention) In the catalytic converter of the invention, by providing a concave portion in at least one of the plurality of catalyst carriers as described above, it is possible to In addition to reducing the spacing between the catalyst carriers, the volume of the catalyst carriers themselves reduced by forming the recesses can be used to influence the length of the catalyst carriers with the recesses or other catalyst carriers. By forming a protruding part on the cone part of the casing, the overall length of the catalytic converter can be shortened without changing the overall volume of the catalyst carrier, that is, without reducing the purification ability of the catalyst. .

(Embodiments) Hereinafter, a catalytic converter according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a catalytic converter according to a first embodiment of the present invention.

In this FIG. 1, reference numeral 1 indicates a casing, and this casing 1, like the conventional one,
It has cone portions 2 and 3 at its tip and rear ends, respectively. Inside this casing 1, first and second catalyst carriers 4 and 5 are arranged in series. These first and second catalyst carriers 4 and 5 are spaced apart from each other in the direction of their arrangement, forming a mixing section 6. In this embodiment, a recess 7 is formed at the front end of the second catalyst carrier 5. This recessed portion 7 forms a part of the mixing portion 6, and due to the formation of this recessed portion 7, the mixing portion 6
The distance between the first and second catalyst carriers 4 and 5 can be reduced without changing the volume of the carrier.

On the other hand, the first catalyst carrier 4 has a convex portion 8 formed at its front end that projects into the cone portion 2 of the casing 1 . It is desirable that the convex portion 8 has approximately the same volume as the volume of the concave portion 7, thereby compensating for the reduction in the volume of the catalyst due to the concave portion 7 and preventing the purification ability of the catalyst from decreasing. ing. The above structure is schematically shown in FIG. 2.

In addition to the arrangement shown in FIGS. 1 and 2, the recess 7 and the projection 8 may both be arranged on the second catalyst carrier 5 as shown in FIG. 3. Furthermore, both the recess 7 and the protrusion 8 may be formed on the first catalyst carrier 4, or the recess 7 and the protrusion 8 may be provided on the first catalyst carrier 4 and the second catalyst carrier 5, respectively. You can. In this case, the concave portions 7 may be formed on the adjacent surfaces of the two catalyst carriers, and the convex portions 8 may be formed on the surfaces on the cone portions 2 and 3 side.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a catalytic converter according to a first embodiment of the present invention, FIG. 2 is a schematic diagram schematically showing the catalytic converter shown in FIG. 1, and FIG.
This figure is similar to FIG. 2, showing a modification in which the arrangement of the convex portions provided on the catalyst carrier is changed. 1... Casing, 2, 3... Cone part, 4,
5... Catalyst carrier, 6... Mixing part, 7... Concave part, 8... Convex part.

Claims (1)

[Scope of utility model registration request] In a catalytic converter in which a plurality of catalyst carriers are arranged and housed in series in one casing,
A recessed portion constituting a part of the mixing space is provided at the end of at least one of the two adjacent catalyst carriers on the other catalyst carrier side, and the other catalyst carrier is disposed at the end inside the casing. A catalytic converter characterized in that a convex portion of a casing is provided with a protruding portion.