JPS595138Y2 - 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 the exhaust gas is sent to the exhaust pipe 2 again.
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.

FIG. 2 shows a first embodiment of the invention.

The interior of the casing 7, which closes the front and rear openings of the can body 5 with end plates 6a and 6b, respectively, is divided into three chambers 10, 11, and 12 by two baffle plates 8, 9 made of perforated plates. There is.

13 is an inlet side exhaust conduit for guiding exhaust gas from the engine into the casing 7; 14 is an outlet side exhaust conduit for discharging the exhaust gas from the casing 7 to the outside;
6b and is inserted into the casing 7.

15 is a cylindrical (or elliptical) catalyst holding cylinder, which is held at both ends by baffle plates 8 and 9, respectively;
The exhaust upstream end opening is hermetically coupled to the inlet exhaust conduit 13, and the exhaust downstream end opening opens into the chamber 12.

16 is a porous tube attached to the end of catalyst holding etc. 15;
One end is fitted onto the holding cylinder 15, and the other end is fitted onto a bracket 17 fixed to the end plate 6b, thereby being fixed in the chamber 12.

Reference numeral 18 denotes a catalyst housed in the large diameter portion 15a of the catalyst holding cylinder 15, and ridges 19 are formed on the inner surface of the large diameter portion 15a.
and an annular support 20 having a cross-sectional shape, which is also fixed to the inner surface of the large diameter portion 15a, and are fixed within the large diameter portion 15a.

Reference numeral 21 denotes a holding material such as a braided stainless steel wire that is filled between the outer surface of the catalyst 18 and the inner surface of the large diameter portion I5a to prevent the catalyst 18 from rattling within the large diameter portion 15a.

Next, the operation of the first embodiment configured as described above will be explained.

The exhaust gas sent from the engine to the artificial exhaust pipe 13 then flows into the catalyst holding tube 15 and passes through the catalyst 18, where harmful components in the exhaust gas are rendered harmless.

The exhaust air then flows out through the perforated tube 16 into the chamber 12, and then through the baffle plate 9, the chamber 11. It passes through the baffle plate 8 and the chamber 10 and is discharged from the outlet side exhaust conduit 14.

During this time, the exhaust gas is subjected to a silencing effect due to expansion, contraction, etc., and the noise is attenuated.

These silencing functions are similar to those of conventional mufflers, so a detailed explanation will be omitted.

FIG. 3 shows a second embodiment of the invention.

In this embodiment, the baffle plate 9 that divides the chamber 11 and the chamber 12 is made of a non-perforated plate, so that the chamber 12 acts as a buffer chamber, and accordingly, the catalyst holding cylinder 15 is Both ends are supported by an end plate 6a and a baffle plate 8, respectively, and held within a chamber 10.

A porous pipe 1 connected to the exhaust downstream opening of the catalyst holding cylinder 15
6 is held within a chamber 11 and has an end opened into a chamber 12 serving as a buffer chamber.

In this embodiment, an example is shown in which the artificial side exhaust pipe 13 and the catalyst holding cylinder 15 are not separated but integrated.

The other constituent parts are the same as those in the first embodiment shown in FIG. 2, so the same parts are given the same reference numerals and the explanation will be omitted.

The operation of the second embodiment configured as described above is essentially the same as that of the first embodiment, but since the chamber 12 acts as a buffer chamber, it is possible to effectively attenuate low frequency components of noise as well. can.

Furthermore, even if the catalyst 18 is damaged and the fragments are sent into the porous tube 16, the opening 16a of the skeleton 16 is not blocked, so the fragments are sent into the chamber 12 and stored there, and the fragments are sent into the porous tube 16. It does not clog the small holes of the baffle plate or the small holes of the baffle plate.

Catalyst debris is also collected in the chamber 12.10 of the first embodiment (FIG. 2) and in the chamber 11.10 of the second embodiment (FIG. 3), where the exhaust flow bends or expands.

The two embodiments of the present invention have been described above, but the exhaust purifier-cum-silencer of the present invention can be used with any other type of silencer as long as it has an inlet-side exhaust pipe and an outlet-side exhaust pipe inserted into the casing. It can be applied to any silencer.

As explained above, the exhaust purifier-cum-silencer of the present invention integrates the muffler and exhaust purifier, which were conventionally manufactured separately, so it eliminates the hassle of managing parts and assembling the exhaust system. In addition to being able to reduce costs, the dust separated from the catalyst can be collected in the case, and it has great practical effects as an exhaust muffler with good purification and muffling performance.

Note that a catalytic muffler that integrates an exhaust purifier and a muffler is described in Japanese Patent Publication No. 33604/1983.
In this method, the exhaust gas flows along the inner surface of the outer wall of the casing and then passes through the catalyst layer, so the temperature of the exhaust gas decreases, reducing the purification efficiency, and the dust generated by damage to the catalyst is emitted without being collected. This method is simple and different from the present invention.

[Brief explanation of drawings]

FIG. 1 is a side view showing an exhaust system of an automobile, and FIGS. 2 and 3 are longitudinal sectional side views showing first and second embodiments of the present invention, respectively. 7: Casing, 13: Inlet side exhaust pipe, 14: Outlet side exhaust pipe, 15: Catalyst holding cylinder, 18: Catalyst.

Claims (1)

[Scope of utility model registration request] The inlet side exhaust pipe 13 and the outlet side exhaust pipe 14 are inserted into the casing 7 , a catalyst holding cylinder 15 is connected to the inlet pipe 13 in the casing 7 , and the catalyst 18 is housed in the cylinder 15 . are partitioned by porous baffle plates 8, 9 to form at least two chambers 10, 11, 12 in which the exhaust gas expands in the casing, and the catalyst holding cylinder 15 is connected to the outlet side exhaust conduit 14 through these chambers. This is an exhaust purifier and silencer.