JPS6024901Y2 - Catalytic converter for exhaust gas purification - Google Patents

Description

[Detailed Description of the Invention] The present invention is mainly applicable to an exhaust gas purifying catalytic converter that is installed in the middle of an exhaust pipe to remove harmful substances contained in the exhaust gas of a vehicle internal combustion engine. The present invention relates to a catalytic converter in which a single type catalyst body having ring-shaped cushions applied to the outer periphery of both end faces can be easily incorporated into a case.

As shown in Fig. 1.2, a conventional catalytic converter for exhaust gas purification has a ring-shaped stopper b also made of stainless steel on the inner periphery of one end of a cylindrical case a made of stainless steel.
is fixed by welding, and has an L-shaped cross section made by knitting stainless steel thin wires around the outer periphery of both ends of a single catalyst body f made of ceramics and having a large number of ventilation holes g formed through it in the axial direction. Fit the ring-shaped cushions h, h, respectively, press fit them into the cushions h, h from the other end of the case a without causing any elastic deformation, and then insert the ring-shaped stopper b from the other end of the case a. is inserted and fixed by welding to elastically hold the single catalyst body f within the case a, and further,
A funnel-shaped connecting pipe d is connected to an exhaust pipe (not shown) at both ends of the case a.

It had a structure in which d was adhered to each part and fixed by welding.

However, in such a structure, as shown in Figure 1,
When press-fitting the single-type catalyst body f with the cushions h and h fitted into the case a, the front edge of the cushion h at the rear end in the press-fit direction gets caught on the edge of the case a and remains rolled up. In order to prevent such troubles, it is necessary to perform the press-fitting work extremely carefully, which reduces work efficiency. This was a major factor hindering improvement.

As described in Japanese Patent Application Laid-Open No. 118910/1982, a single type catalyst body has ring-shaped cushions applied to the outer periphery of both end faces and is housed in a metal cylindrical cover. A cassette-like structure is known that is compressed by pressing in the radial direction from the center to the center, and bent inward at both ends to form a cassette. This has the drawback of requiring large-scale equipment to squeeze and bend the metal cylindrical cover, resulting in high costs.

The present invention eliminates these drawbacks, and makes it possible to extremely easily press fit a single catalyst body fitted with a cushion into a case, and to manufacture the exhaust gas at a low cost. The object of the present invention is to provide a purification catalytic converter.

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 3 to 6.

In the figure, reference numeral 1 denotes a single catalyst body made of ceramics with a large number of ventilation holes 2 perforated in the axial direction, and ring-shaped cushions 3 having an L-shaped cross section are fitted around the outer periphery of both ends of the catalyst body. has been done.

The cushion 3 is made by compression molding in the axial direction a material made of a cylindrical knitted stainless steel wire, and includes a cylindrical portion 4 surrounding the outer periphery of the single catalyst body 1, and a flat portion 5 that is applied to the end surface. It consists of

The above configuration is exactly the same as the conventional device shown in the example shown in FIG. The curved hook-shaped locking parts 7, 7 at both ends of each connecting member 6 are inserted into the flat parts 5, 5 of the cushions 3, 3 at both ends of the single type catalyst body 1, and The cushions 3, 3 are connected.

In this way, the single catalyst body 1 with the cushions 3, 3 combined is housed in a cylindrical case 10 with a ring-shaped stopper 11 fixed by welding to the inner periphery of one end, as shown in FIG. The periphery of the cylindrical portion 4 of the cushion 3 is held down by the connecting member 6, and also serves as a guide when the connecting member 6 is press-fitted into the case 10. , the cushions 3, 3, especially the cylindrical portion 4 of the cushion 3 at the rear end in the press-fitting direction, can be smoothly press-fitted without getting caught on the edge of the insertion opening of the case 10 and curling up, and the cushions 3, 3 at both ends can be press-fitted smoothly. are connected by the connecting member 6, the cushion 3 at the rear end in the press-fitting direction can be press-fitted into the case 10 without being pulled out from the single-type catalyst body 1, and furthermore, handling before and during press-fitting is easy. Since there is no risk that the cushions 3, 3 will come off from the single catalyst body 1, transportation and removal are extremely easy.

As shown in FIG. 6, a stopper 11 is fitted into the case 10 into which the single-type catalyst body 1 is press-fitted, and is fixed by welding to elastically fit the single-type catalyst body 1 into the case 10. Furthermore, funnel-shaped connecting pipes 12 are provided at both ends of the case 10.
Connect 12.

After being press-fitted into the case 10, the straight portion of the connecting member 6 also bites into the outer periphery of the cushions 3, 3, so that the outer surface of the cushions 3, 3 is connected to the inner surface of the case 10 and the stopper 11.1.
A part of the exhaust gas is prevented from passing between the single catalyst body 1 and the case 10 and being discharged unpurified.

As clarified by the above explanation, the catalytic converter for exhaust gas purification of the present invention has a single catalyst body with ring-shaped cushions on the outer periphery of both end faces, which is housed inside a cylindrical case. In the catalytic converter for exhaust gas purification, the single-type catalyst body is elastically held in the case by abutting stoppers protruding from the outer surfaces of the two cushions. The cushion is connected by a plurality of linear connecting members passing between the medium and the case, and in order to prevent the cushion from coming off the single catalyst body, it cannot be applied to the single catalyst body and its both end faces. The cushion can be pressed into the case very easily, and since the connecting member is linear, it can be easily bent, cut, etc. with simple equipment, increasing the efficiency of assembly work. This has the effect of improving performance and reducing costs.

[Brief explanation of the drawing]

1 and 2 show a conventional example, with FIG. 1 being a sectional view before assembly, and FIG. 2 a sectional view after assembly. Figures 3 to 6 show one embodiment of the present invention, Figure 3 is an enlarged front view of the connecting member, Figure 4 is a perspective view of the cushion connected by the connecting member, and Figure 5 is the front view of the assembly. FIG. 6 is a sectional view after assembly.

Claims (1)

[Claims for Utility Model Registration] A single type catalyst body with ring-shaped cushions applied to the outer periphery of both end faces is housed in a cylindrical case, and a stopper protruding from the inner surface of the case is provided on the outer surface of both cushions. In the catalytic converter for exhaust gas purification, the single-type catalyst body is elastically held in the case by applying a plurality of lines between the cushions and the single-type catalyst body and the case. A catalytic converter for exhaust gas purification, characterized in that the converter is connected by a connecting member having a shape.