JP2002276334A - Muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting to a vehicle by reducing a length of a casing, enhance reliability in exhaust emission control function, and facilitate a maintenance such as a filter exchange or the like, in a muffler in which an exhaust gas discharged from an internal combustion engine is purified, a generated detonating sound is reduced, and the purified exhaust gas is discharged. SOLUTION: In this muffler 1, an inside of the casing 2 is provided with: a catalyst 3 which accelerates a chemical reaction of a harmful matter included in the exhaust gas G discharged from the internal combustion engine; a filter 4 which collects solid particulate matters in the exhaust gas; and a muffler part 5 which reduce the detonating sound of the exhaust gas. In this muffler 1, the catalyst 3, the filter 4, and the muffler part 5 are arranged side by side on a single passage. Accordingly, the length of the casing 2 of the muffler 1 can be reduced to facilitate mounting to the vehicle, and the reliability in the exhaust emission control function is enhanced, thereby facilitating the maintenance such as the filter replacement or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for purifying exhaust gas discharged from an internal combustion engine and reducing its explosive sound and discharging the exhaust gas. Related to silencers.

[0002]

2. Description of the Related Art As a conventional silencer of this type, for example, as described in Japanese Utility Model Application Laid-Open No. 6-43215, a chemical reaction of harmful substances contained in exhaust gas discharged from an internal combustion engine is formed inside a casing. And a filter for collecting fine solids in the exhaust gas, and a muffler for reducing the explosive sound of the exhaust gas. here,
The catalyst, the filter, and the muffling section are arranged in series inside the casing, and serve as a flow path through which exhaust gas discharged from the internal combustion engine passes, and the exhaust gas passes through this exhaust gas flow path. It was purified and its explosive noise was reduced and discharged.

[0003] In the muffler casing,
A combustion device such as a heater for burning fine solids attached to the inside of the filter, and a bypass that serves as an exhaust gas flow path separate from the filter, and when regenerating the filter, The exhaust gas passes only through the bypass, and in the meantime, the minute solids in the filter are burned by the combustion device.

Further, the casing has a structure in which a sealing material or the like is attached to a divided portion to prevent gas leakage and, for example, can be divided into two portions at a central portion. Divide the casing into two,
The filter was attached and detached from the open part.

[0005]

However, in such a conventional silencer, the catalyst, the filter and the silencer are arranged in series inside the casing. When a catalyst, a filter, and a silencer necessary for reducing the loud noise are arranged, the silencer becomes longer in the longitudinal direction, and such a silencer may be difficult to be mounted on a vehicle in a layout of vehicle parts.

[0006] The casing has a structure that can be divided into two parts at the center, for example, in order to replace the filter. This increases the possibility of exhaust gas leakage, and makes it difficult to replace the filter. Accordingly, the present invention addresses such problems, shortens the length of the casing to facilitate mounting on a vehicle, improves the reliability of the exhaust gas purification function, and facilitates maintenance such as filter replacement. It is intended to provide a simple silencer.

[0007]

In order to achieve the above object, a muffler according to the present invention comprises, inside a casing, a catalyst for promoting a chemical reaction of harmful substances contained in exhaust gas discharged from an internal combustion engine; In a muffler comprising a filter for collecting fine solids in the exhaust gas, and a muffling unit for reducing the explosive sound of the exhaust gas, the catalyst, the filter, and the muffling unit are arranged on a single flow path of the exhaust gas. Are arranged in parallel with each other.

[0008] With such a configuration, the catalyst, the filter, and the muffling section are arranged in parallel on the single flow path of the exhaust gas inside the casing, so that the length of the casing in the longitudinal direction is reduced. Further, the chemical reaction of harmful substances contained in the exhaust gas discharged from the internal combustion engine is promoted by the catalyst, fine solids in the exhaust gas are collected by the filter, and the explosive noise of the exhaust gas is reduced by the muffler. As a result, the purifying function and the noise reduction effect of the exhaust gas which is reduced and discharged are improved.

Further, the filter is of a continuous regenerating type in which fine solids are collected and regenerated by utilizing exhaust heat of exhaust gas. As a result, the filter continuously regenerates using the exhaust heat of the exhaust gas while always collecting the minute solids. Further, the filter is provided with an opening in a part of the outer surface of the casing, and is detachably attached to the opening in a sealed state. Thus, the filter can be easily replaced at an opening provided in a part of the outer surface of the casing.

[0010] The catalyst and the filter are arranged on the inlet side of the exhaust gas passage, and the muffler is arranged on the outlet side of the exhaust gas passage. As a result, the catalyst is activated in the high temperature portion of the exhaust gas, the filter is regenerated, and the function of purifying the exhaust gas is improved.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of a muffler according to the present invention. This silencer 1
Is for purifying the exhaust gas G discharged from an internal combustion engine (not shown) and reducing the explosive sound and discharging the exhaust gas G. Inside the casing 2, a catalyst 3, a filter 4, and a silencer 5 (FIG.
Are disposed on the flow path of the exhaust gas G.

The casing 2 serves as a muffler main body and has an arbitrary shape that can be easily mounted on a vehicle. For example, the casing 2 has a substantially square cylindrical shape that can be easily mounted in an empty space on the side of the vehicle. The front and rear edges are closed by two end plates 6a, 6b (see FIG. 2), and a plurality of baffle plates 7a, 7b,. The two end plates 6a and 6b (see FIG. 2) cover the front and rear edges of the casing 2 to keep the casing 2 in a sealed state. Here, an inlet pipe 8 and an outlet pipe 9 are provided so as to protrude from an end plate 6a closing the front end edge. The inlet pipe 8 takes the exhaust gas G discharged from the internal combustion engine into the casing 2. The outlet pipe 9 discharges exhaust gas G taken into the casing 2 to the outside.

The plurality of baffle plates 7a, 7
b,... partition the space inside the casing 2 into a plurality of spaces. Here, the inside of the casing 2 is partitioned into five spaces by four baffle plates 7a to 7d. That is, the two baffle plates 7a and 7b
By this, the space inside the casing 2 is partitioned into three spaces in the front-rear direction, and the two baffle plates 7
a, 7b is divided into two spaces in the left-right direction by another baffle plate 7c, and the one space divided in the left-right direction is further divided into two spaces in the up-down direction by another baffle plate 7d. It is divided into spaces.

The lower space vertically divided by the baffle plate 7d is defined as a first chamber R1, the upper space is defined as a third chamber R3, and the baffle plate 7c
The left space divided in the left-right direction by the fifth room R5,
A space on the front edge side partitioned by the baffle plates 7a and 7b in the front-rear direction is a fourth chamber R4, and a space on the rear edge side is a second chamber R2. The above four baffle plates 7a-
Each space of the first room R1 to the fifth room R5 partitioned by 7d,
It becomes a flow path through which the exhaust gas G discharged from the internal combustion engine passes.

FIG. 2 is a sectional view showing an embodiment of a muffler according to the present invention, wherein FIG. 2 (a) is a sectional view taken along line AA of FIG.
FIG. 2B is a sectional view taken along line BB of FIG. 1. A catalyst 3 is arranged inside the casing 2 as shown in FIG. The catalyst 3 promotes the oxidation or reduction reaction of harmful substances contained in the exhaust gas G discharged from the internal combustion engine.

FIG. 2A shows the inside of the casing 2.
The filter 4 is arranged as shown in FIG. The filter 4 collects fine solids in the exhaust gas G discharged from the internal combustion engine. The catalyst 3 and the filter 4 are held inside the casing 2 via a cushioning material 10 as shown in FIG. This allows
The vibration generated when the exhaust gas G passes through the catalyst 3 and the filter 4 is absorbed.

FIG. 2A shows the inside of the casing 2.
As shown in FIG. The silencer 5 reduces explosive noise of exhaust gas G discharged from the internal combustion engine, and includes two silencers 11, 11 having a substantially cylindrical shape, for example, as shown in FIG. It is arranged inside the casing 2. As a result, when the exhaust gas G discharged from the internal combustion engine passes through a number of holes provided on the side surfaces of the silencers 11, 11 arranged in the silencer 5, the explosion noise is reduced by repeating expansion and contraction. Is done.

Here, in the silencer 1 according to the present invention, the catalyst 3, the filter 4 and the silencer 5 are arranged in parallel on a single flow path of the exhaust gas G discharged from the internal combustion engine. . That is, as shown in FIG. 2A, the catalyst 3 is placed in the first chamber R1, and the filter 4 is placed in the third chamber R.
3, the catalyst 3 and the filter 4 are arranged in parallel with each other, and as shown in FIG. 2 (b), the silencer 5 is arranged in the fifth chamber R5. 5 is arranged in parallel with the catalyst 3 and the filter 4. The flow path of the exhaust gas G discharged from the internal combustion engine is a single flow path that passes through the first chamber R1 to the fifth chamber R5 sequentially without branching on the way. By arranging the catalyst 3, the filter 4, and the muffling unit 5 on the single flow path of the exhaust gas G, the exhaust gas G discharged from the internal combustion engine is purified by the catalyst 3 and the filter 4, The noise of the exhaust gas G can be reduced and discharged by the silencer 5. Further, by arranging the catalyst 3, the filter 4, and the silencer 5 in parallel within the casing 2 of the silencer 1, the longitudinal length of the casing 2 can be reduced.

Here, the catalyst 3 and the filter 4 are arranged in parallel in two rows on the left and right.
Although the silencer 5 and the silencer 5 are arranged in parallel in two upper and lower stages, the present invention is not limited to this, and the catalyst 3, the filter 4 and the silencer 5 may be arranged in parallel in the vertical or diagonal direction. Also,
The direction in which the inside of the casing 2 of the muffler 1 is partitioned into two rows on the left and right and two rows on the top and bottom, but is not limited to this. It can be arbitrarily designed according to.
For example, the catalyst 3, the filter 4, and the muffling unit 5 may be arranged in parallel by partitioning them into three or more rows on the left or right or three or more rows.

The filter 4 is preferably of a so-called continuous reproduction type. Thus, it is not necessary to provide a combustion device such as a heater or a bypass used only when the filter is regenerated, unlike the conventional silencer. Therefore, since the exhaust gas G always passes through the filter 4 and is purified, the purifying action of the exhaust gas G does not decrease.
The purification performance of the silencer 1 can be improved. In addition, since the number of parts is reduced, the manufacturing cost of the silencer 1 can be reduced, and maintenance work is simplified,
Easy after-sales service.

FIG. 3 is a perspective view showing a structure in which the filter 4 is detachably attached to the casing 2. The casing 2 of the muffler 1 is provided with an opening 12 at a part of an outer surface thereof, and the filter 4 is detachably attached to the opening 12. That is, an opening 12 is provided on the outer surface of the casing 2 with a minimum size of the filter 4, and bolt holes 14, 1 for fixing a filter unit 13 described later are formed on the outer peripheral edge of the opening 12.
4,... Are opened as many as necessary, and these bolt holes 14, 1 are formed.
Nuts are welded to the inner surfaces of the casing 2 at 4,.

The filter unit 13 holds the filter 4 and is removably attached to the opening 12 as shown in FIGS. 4 (a) and 4 (b).
, The filter support 19 and the cushioning material 10. The lid 15 covers the opening 12 and has a shape that keeps the casing 2 in a sealed state. The lid 15 is slightly larger than the diameter of the bolt 16 at a position corresponding to the bolt holes 14, 14,. .. Are provided. The filter support 19 supports the filter 4 and has a structure that supports the filter via the cushioning material 10 and makes the filter 4 detachable. As shown in FIG. 4B, the filter 4 held by the filter unit 13 is detachable by sliding in the directions of arrows E and F in the opening direction of the filter support 19. The filter unit 13 includes the filter 4
It is not limited to the above-described one as long as it can hold and can be detachably attached at the opening 12.

A filter unit 13 for holding the filter 4 is fitted into an opening 12 provided in the casing 2. The opening 12 and the lid 15 of the filter unit 13 are connected to a bolt hole 14 through a bolt hole 14. The holes 17 are aligned with each other and fixed with bolts 16. At this time, since the gasket 18 made of a sealing material such as rubber is mounted between the casing 2 and the lid portion 15, the casing 2 is maintained in a sealed state and leakage of the exhaust gas G is prevented. Can be. Here, the opening 12 is
Since the filter 4 is provided with the minimum size, the possibility of exhaust gas leakage can be significantly reduced. The portion of the bolt hole 14 is not limited to the welding nut, but may be a welding bolt by inserting a bolt from the inner surface of the casing 2 and welding.

As shown in FIG. 2, the catalyst 3 and the filter 4 are arranged on the inlet side of the exhaust gas passage, and the silencer 5 is arranged on the outlet side of the exhaust gas passage. . As a result, the exhaust gas G discharged from the internal combustion engine
Enters the casing 2 through the inlet pipe 8, first passes through the catalyst 3 and the filter 4, then passes through the silencer 5, and is discharged from the outlet pipe 9. Accordingly, the catalyst 3 can be activated and the filter 4 can be regenerated by effectively utilizing the exhaust heat of the exhaust gas G, and the purifying function and the regenerating function of the catalyst 3 and the filter 4 can be improved. The arrangement of the catalyst 3 and the filter 4 is not limited to the above, and may be reversed.

Next, the use state of the muffler 1 configured as described above will be described with reference to the accompanying drawings. here,
The inlet pipe 8 of the silencer 1 is connected to an exhaust pipe (not shown) of the internal combustion engine. The exhaust gas G discharged from the internal combustion engine enters the casing 2 through the inlet pipe 8 as shown in FIG. 2A, and first passes through the first chamber R1 in which the catalyst 3 is disposed. Thus, the exhaust gas G is chemically changed to be more harmless by the action of the catalyst 3, and the explosion noise is reduced. Next, the exhaust gas G1 passes through the second chamber R2. Since the exhaust gas G1 expands in the second chamber R2 having a larger volume than the first chamber R1 and changes its traveling direction rapidly, the explosion noise is reduced. Next, the exhaust gas G1 is turned back at the end plate 6b and the third chamber R3 in which the filter 4 is disposed.
Pass through. As a result, the exhaust gas G <b> 1 is used to remove fine solids generated in the combustion process of the internal combustion engine by the filter 4 and reduce the explosion noise.

Further, the exhaust gas G2 from which the fine solids have been removed passes through the fourth chamber R4. The above exhaust gas G2
Is expanded again in the fourth chamber R4, which has a larger volume than the third chamber R3, and its traveling direction changes abruptly, so that the explosion noise is reduced. The exhaust gas G2 is as shown in FIG.
As shown in (5), it turns back at the end plate 6a and passes through the fifth chamber R5 in which the muffling unit 5 is arranged. As a result, the exhaust gas G2 repeatedly expands, contracts, resonates, interferes, and the like inside the silencer 5, so that the explosive noise is significantly reduced. As described above, the exhaust gas G discharged from the internal combustion engine is purified and reduced in explosive noise, and is discharged from the outlet pipe 9 as the exhaust gas G3.

When attaching and detaching the filter 4, as shown in FIG. 3, a bolt 16 for fixing an opening 12 provided in the casing 2 and a lid 15 of the filter unit 13 is removed. Then, the filter unit 13 is removed from the opening 12. Then, the filter 4 held by the filter unit 13 is slid in the direction of arrow E shown in FIG.
May be cleaned and slid again in the direction of arrow F into the filter unit 13. The opening 12 is
Since the filter 4 is provided with the minimum size, the possibility that the exhaust gas G leaks can be significantly reduced, and the filter 4 can be attached and detached without removing the muffler 1 from the vehicle.

The casing 2 has a substantially square cylindrical shape so that it can be easily mounted in the space on the side of the vehicle.
Any shape may be used as long as it can be easily mounted on a vehicle. Although the inside of the casing 2 is divided into the first chamber to the fifth chamber by four baffle plates, the number of baffle plates and the direction of dividing the inside of the casing 2 are not limited to the above, and the catalyst 3 and the filter 4. It can be designed according to the shape and arrangement of the silencer 5. Further, here, the inlet pipe 8 and the outlet pipe 9 are both provided so as to protrude toward the end plate 6a that closes the front end edge. However, the present invention is not limited thereto.
May be provided so as to project toward the end plate 6a at the front end, and the outlet pipe 9 may be provided so as to project toward the end plate 6b at the rear end. The shape of the silencer 11 is
Although it has a substantially cylindrical shape, it may be formed by a plate (not shown) having a large number of holes, or may be a combination thereof.

The filter 4 is not limited to the continuous regeneration type, but may be, for example, a plug type, a porous type or a fiber type. Further, the catalyst 3 and the filter 4 are arranged on the inlet side of the exhaust gas flow path, and the silencer 5 is arranged on the outlet side thereof. However, the arrangement of the catalyst 3 and the filter 4 and the silencer 5 is as follows. However, the present invention is not limited to this. If the catalyst 3 can be activated and the filter 4 can be regenerated using the exhaust heat of the exhaust gas G discharged from the internal combustion engine, the arrangement may be reversed.

[0030]

The present invention has been configured as described above.
According to the first aspect of the present invention, the length of the casing in the longitudinal direction can be reduced by arranging the catalyst, the filter, and the muffling part in parallel on the single flow path of the exhaust gas. Therefore, the muffler can be easily mounted on the vehicle in the layout of the vehicle components. For example,
If the shape of the muffler main body is made into a substantially square cylindrical shape and the length in the longitudinal direction of the casing is shortened, the muffler can be easily mounted in an empty space of the vehicle.

According to the second aspect of the present invention, since the filter is of a continuous regeneration type that regenerates while collecting fine solids, continuous regeneration is performed while always collecting fine solids. Can be. Thereby, it is not necessary to provide a combustion device such as a heater or a bypass used only for regeneration of the filter. Therefore, fine solids and the like contained in the exhaust gas discharged from the internal combustion engine are always removed, and the purification performance of the exhaust gas can be improved. Further, since the number of parts is reduced, manufacturing costs can be reduced.

Further, according to the third aspect of the present invention, the filter is provided with an opening in a part of the outer surface of the casing, and the filter is detachably attached to the opening in a sealed state, so that the filter can be attached to the casing. The opening can be easily replaced at an opening provided in a part of the outer surface. Thereby, maintenance such as replacement of the filter is facilitated, and the sealed state of the casing during use can be easily maintained. Therefore, the filter can be replaced without removing the muffler body from the vehicle. In addition, the possibility of exhaust gas leakage can be significantly reduced.

According to the fourth aspect of the present invention, the catalyst and the filter are arranged on the inlet side of the exhaust gas passage, and the muffler is arranged on the outlet side of the exhaust gas passage. In addition, the catalyst is activated in the high temperature portion of the exhaust gas, and the filter is regenerated, so that the exhaust gas purifying function can be improved. Therefore, the exhaust heat of the exhaust gas can be effectively used, and the purification function and the regeneration function of the catalyst and the filter can be improved in reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a muffler according to the present invention.

2A and 2B are cross-sectional views illustrating an embodiment of the muffler, wherein FIG. 2A is a cross-sectional view taken along line AA of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view taken along line B.

FIG. 3 is a perspective view showing a structure in which a filter is detachably attached to a casing.

FIG. 4 is an explanatory view showing the structure of a filter unit;
(A) is a view on arrow C of FIG. 3, and (b) is a cross-sectional view taken along line DD of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Silencer 2 ... Casing 3 ... Catalyst 4 ... Filter 5 ... Silencing part 6 ... End plate 7 ... Baffle plate 8 ... Inlet pipe 9 ... Outlet pipe 10 ... Buffer material 11 ... Silencer 12 ... Opening 13 ... Filter unit 14 ... Bolt hole 15 ... Lid 16 ... Bolt 17 ... Through-hole 18 ... Gasket 19 ... Filter support

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F01N 3/24 F01N 3/24 J 7/00 Z 7/00 B01D 46/42 B // B01D 46/42 53/36 ZABB F term (reference) 3G004 AA01 BA06 BA09 CA04 CA06 DA00 DA01 EA00 FA08 GA06 3G090 AA01 BA01 BA08 EA01 EA02 3G091 AA01 AB02 AB13 BA00 BA15 BA19 GA06 HA05 HA15 HA16 4D048 CC38 CD05 CD08 4D058 MA41 SA08 TA06

Claims (4)

[Claims] 1. A catalyst for promoting a chemical reaction of harmful substances contained in exhaust gas discharged from an internal combustion engine, a filter for collecting fine solids in the exhaust gas, and a filter for the exhaust gas. A muffler comprising a muffler for reducing explosive noise, wherein the catalyst, the filter, and the muffler are arranged in parallel on a single flow path of exhaust gas. 2. The muffler according to claim 1, wherein the filter is of a continuous regeneration type that regenerates while collecting fine solids by utilizing exhaust heat of exhaust gas. 3. The filter according to claim 1, wherein an opening is provided in a part of the outer surface of the casing, and the filter is detachably attached to the opening in a sealed state.
The silencer described. 4. The exhaust gas passage according to claim 1, wherein the catalyst and the filter are arranged on the inlet side of the exhaust gas passage, and the muffler is arranged on the outlet side of the exhaust gas passage. Or the muffler according to item 1.