JPS5851365Y2 - Catalyst case for exhaust gas purification - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a catalyst case for purifying exhaust gas of an internal combustion engine.

There is a device that purifies exhaust gas from an internal combustion engine by bringing it into contact with a catalyst to cause an oxidation reaction.

In this case, when a pellet-shaped catalyst is used, the pellet-shaped catalyst is placed in a cage of a punching plate provided with a large number of small holes to allow exhaust gas to pass through.

In other words, a catalyst case consisting of a punching plate with double inner and outer cylinders is supported in a cantilevered manner on one side of the substrate installed in the purification cylinder, a pellet catalyst is sealed in the case, and the inside of the catalyst is exhausted. Allowing gas to pass through.

However, if the punching plate has holes at the cut end, it will be weak to support the weight of the catalyst, so it is necessary to avoid making small holes in the part where the punching plate is welded to the substrate, and it is difficult to use a large punching plate. There is no cutter to cut to the required size, and the board is punched to the required size to prevent small holes from forming at the edges, which requires a lot of manufacturing time and increases costs.

This invention has been improved in view of these points, and an embodiment of the invention shown in the drawings will be described below.

An annular protrusion 2 is press-molded on one side of a substrate 1 having a central opening.

Then, a punching plate provided with a large number of 1JfL 3 is cut into a predetermined size, and the proximal end of the inner tube 4 is welded to the inner peripheral side of the annular protrusion 2.

Further, a punching plate with a large number of small holes 3 is cut into a predetermined size, the outer cylinder 5 is rolled up, and the base end of the outer cylinder 5 is aligned with the outer circumferential side of the annular protrusion 2, and a band plate 6 is wound thereon. The outer cylinder 5 and the strip plate 6 are welded to the substrate 1.

A closing plate 7 is welded to the tip of the inner tube 4, and a ring-shaped closing plate 8 is also welded to the tip of the outer tube 5, so that an annular catalyst chamber 9 is formed by the inner tube 4 and the outer tube 5.

The catalyst chamber 9 is filled with pellet-like (7) Mill from the inlet 10.

Note that the substrate 1 is fixed to the mating surface of the purification cylinder 12.

The effect will be explained.

Exhaust gas flowing in the purification cylinder 12 passes from the inside of the inner cylinder 4 through the catalyst chamber 9 to the outside of the outer cylinder 5.

Then, it touches the catalyst 11 in the catalyst chamber 9 to cause an oxidation reaction and purify it.

The weight of the catalyst 11 and vibrations apply the most load to the welded part between the outer cylinder 5 and the substrate 1, but since the strip plate 6 is welded together here, the cut end of the small hole 3 is Even if there is, tone plate 6
Since it is reinforced, there is no need to worry about cracks or the like.

In this way, the inner cylinder 4 and the outer cylinder 5 can be used by setting the /J-shaped L3 in advance and cutting the hunting plate to desired dimensions.

As explained above, this invention involves welding an inner tube made of a rounded punching plate to the inner circumference of the annular protrusion, and an outer tube made of a rolled punching plate to the outer circumference of the protrusion. The strip plates are welded together, a closing plate is welded to the tips of the inner and outer cylinders, and a pellet catalyst is inserted between the inner and outer cylinders, so that the part of the outer cylinder that receives the most load is ,
Since the strip is welded and reinforced, there is no need to worry about cracking.

Therefore, the inner cylinder and the outer cylinder can be used by cutting a punching plate with small holes in advance into a predetermined size, which saves time and effort in manufacturing and reduces costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a partially exploded view of the outer cylinder. 1... Substrate, 2... Annular protrusion, 4...
...Inner cylinder, 5...Outer cylinder, 6...
Band plate, 7... Closing plate, 8... Closing plate,
11...Catalyst.

Claims (1)

[Scope of utility model registration request] In a catalyst case for exhaust gas purification that is supported in a cantilevered manner on one side of a substrate installed in a purification cylinder, the inner periphery of an annular protrusion provided on one side of a substrate having a central opening. Weld the base end of an inner cylinder with a rounded punching plate on the side, weld the base end of an outer cylinder with a rounded punching plate on the outer periphery of the protrusion, overlapping the band plates, and weld the ends of the inner cylinder and outer cylinder. A catalyst case for exhaust gas purification characterized by a welded closing plate and a pellet catalyst inserted between an inner cylinder and an outer cylinder.