JPS597531Y2 - Exhaust purifier/silencer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an exhaust purifier-cum-silencer in which an exhaust purifier and a muffler are integrally assembled in the middle of an exhaust pipe of an automobile.

Exhaust purifiers and mufflers are connected to exhaust pipes for discharging exhaust gas from automobile engines into the atmosphere.

That is, as shown in FIG. 1, an exhaust purifier 3 and a muffler 4 are connected in the middle of an exhaust pipe 2 led out from an engine 1, and the exhaust gas discharged from the engine passes through the exhaust pipe 2. The exhaust gas is sent to the exhaust gas purifier 3, where harmful components in the exhaust gas are rendered harmless, and then returned to the exhaust pipe 2.
The noise energy is attenuated by being sent to the muffler 4 through the tube end 2a, and then released into the atmosphere from the tube end 2a.

By the way, in the past, the exhaust purifier 3 and the muffler 4 were manufactured separately, which not only increased the number of parts and made parts management troublesome, but also increased the number of man-hours required to assemble the exhaust system. This causes high costs.

The exhaust purifier and muffler of the present invention solves the above-mentioned drawbacks by manufacturing the exhaust purifier and the muffler integrally.

Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

In the embodiment shown in FIG. 2, 5 is an outer cylinder serving as a casing, and has openings on the exhaust upstream side (left side in the drawing) and the exhaust downstream side, and small diameter portions 5 a and 5 b at the ends, respectively. It is shaped like a funnel.

Reference numeral 6 denotes an inner cylinder installed in the outer cylinder 5 so as to be concentric with the cylinder 5, and similarly to the outer cylinder 5, the openings on the exhaust upstream side and the exhaust downstream side are each provided with a small diameter portion 6 at the end. It is shaped like a funnel with a and 6 b.

The outer tube 5 and the inner tube 6 shaped as described above are assembled with a cylindrical gap 7 interposed between the inner surface of the outer tube 5 and the outer surface of the inner tube 6.

That is, the small diameter parts 5a and 5b at both ends of the outer cylinder 5 are airtightly fitted into the small diameter parts 6a and 6b at both ends of the inner cylinder 6.

(Actually, one small diameter portion 5b of the outer cylinder 5 is formed after the inner cylinder 6 is inserted into the outer cylinder 5.

) 8 is a catalyst installed in the exhaust upstream half of the inner cylinder 6, which includes a ridge 9 formed on the inner surface of the inner cylinder 6 and an annular ring having an L-shaped cross section fixed to the inner surface of the inner cylinder 6. It is fixed to the inner surface of the inner cylinder 6 while being held between the support body 10 and the support body 10 .

Reference numeral 15 denotes a retainer such as a braided wire of thin wire for preventing the catalyst from rattling within the inner cylinder 6.

Reference numeral 11 denotes a partition wall fixed to the exhaust downstream side of the inner cylinder 6;
A large number of small holes 12a and 12b are bored in the inner cylinder 6 at the front and rear of the cylinder 1.

Reference numeral 13 denotes a partition wall installed at the center of the cavity 7 to reinforce the connection between the outer cylinder 5 and the inner cylinder 6 and to divide the cavity 7 into an interference chamber 7a and a first expansion chamber 7b. 14 are drilled.

Although it is desirable to provide such a partition wall 13 in terms of strength and function, it is not necessary to provide it.

Next, the operation of the exhaust purifier/silencer of the present invention constructed as described above will be explained.

Exhaust gas sent from the engine through the exhaust conduit flows into the inner cylinder 6 through the small diameter portion 6a, and then passes through the catalyst 8, where harmful components in the exhaust gas are rendered harmless.

After passing through the catalyst 8, the exhaust gas flowing into the exhaust downstream side of the inner cylinder 6 is blocked by the partition wall 11, so that the exhaust gas flows through the small holes 12a that have been bored around the inner cylinder 6. ,12
a flows into the first expansion chamber 7b and returns to the small hole 12b.
, 12b into the inner cylinder 6.

Here, the sound waves in the exhaust gas that have flowed out into the first expansion chamber 7b also enter the interference chamber 7a through the partition wall 13 and the through holes 14, 14, and are subjected to a silencing effect due to interference in the chamber 7a.

In addition to this interference effect, when the exhaust gas passes through the small hole 12a, the first expansion chamber 7b, and the small hole 12b, the noise is attenuated by contraction, expansion, resistance, etc., and the noise is attenuated.
is discharged to the atmosphere by an exhaust conduit (not shown) connected to.

Since the exhaust purifier and silencer of the present invention is constructed and operates as described above, there is no need to handle the two parts, the exhaust purifier and the silencer, separately, making it easier to manage parts and assemble the exhaust system. It is possible to save labor and reduce costs, and the exhaust purification section containing the catalyst 8, the partition wall 11, and the small hole 12 a
, 12b, etc. can be adjusted separately to improve the functions of each, and has great practical effects such as being usable for honeycomb catalysts and granular catalysts.

Incidentally, an exhaust purification/silencer that has a purification section and a silencing section integrated is described in Japanese Utility Model Publication No. 44-883, but this is because the functions of exhaust purification and silencing are related to each other. The function and the silencing function cannot be adjusted independently, which is different from the present invention.

[Brief explanation of drawings]

FIG. 1 is a side view showing an exhaust system of an automobile, and FIG. 2 is a longitudinal side view showing an embodiment of the present invention. 5: outer cylinder, 6: inner cylinder, 7: void, 8: catalyst, 11: partition wall, 12a, 12b: small hole.

Claims (1)

[Scope of utility model registration request] The front and rear openings of a cylindrical gap 7 formed between an outer cylinder 5 and an inner cylinder 6 which are assembled concentrically are sealed airtight, and a catalyst 8 is installed in the exhaust upstream half of the inner cylinder 6. , a partition wall 11 is fixed in the inner cylinder 6 on the downstream side of the exhaust gas of the inner cylinder 6, and a large number of small holes 12 a 12 b are bored in the inner cylinder 6 before and after the partition wall 11 to serve as an exhaust gas purifier and sound muffler. vessel.