KR20190118299A - Muffler with catalyst - Google Patents

Abstract

According to the present invention, a muffler with a catalyst comprises: a muffler case of which an exhaust manifold is connected to one end portion, wherein a cross section area of the muffler case is increased in a longitudinal direction and then is reduced to reduce noise of exhaust gas flowing thereinto; and a catalyst case of which a cone-shaped entrance portion is installed to communicate with the other end portion of the muffler case to be provided in a downstream portion of the muffler case, wherein a catalyst carrier is provided therein.

Description

Catalyst Silencer {Muffler with catalyst}

The present invention relates to a catalyst integrated silencer in which an exhaust silencer and a catalyst device are integrated.

The combustion gas generated in each cylinder of the engine is collected through an exhaust manifold connected to the cylinder head and then discharged to the atmosphere through the exhaust pipe.

However, since the exhaust gas discharged from the engine is high temperature and high pressure, when it is simply discharged to the outside through the exhaust pipe, it becomes a subject to be regulated by reducing the riding comfort and noise environment pollution due to severe noise generation.

For this reason, a silencer is mounted in the middle of the exhaust pipe to lower the temperature and pressure of the exhaust gas to reduce exhaust noise.

The silencer rolls a steel sheet to form a cylinder, and divides the cylinder into several spaces, and when the exhaust gas passes through the spaces, it causes interference of sound waves, decreases pressure, and decreases the exhaust temperature. It is supposed to be.

However, when the noise reduction is not enough with only the address sound, the exhaust system is configured to additionally attenuate and discharge the noise by attaching an auxiliary silencer in front of the address sound.

Conventionally, in the exhaust system, the catalyst device and the auxiliary silencer are separately separated, so that the catalyst device plays a role of reducing the exhaust gas and the auxiliary silencer, respectively, and has to arrange components in a separate space.

The matters described as the background art are only for the purpose of improving the understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the related art already known to those skilled in the art.

KR20-1999-0012405

The present invention has been proposed to solve this problem, and the catalyst device and the auxiliary silencer in the exhaust system is designed to have an integrated structure, thereby providing a catalyst integrated silencer that reduces the volume package, manufacturing cost and manufacturing time. have.

A catalyst integrated silencer according to the present invention for achieving the above object is a silencer which is connected to the exhaust manifold at one end, the cross-sectional area is increased in the longitudinal direction and then reduced to reduce the noise of the exhaust gas flowing into the interior. case; And a catalyst case having a cone-shaped inlet part installed to communicate with the other end of the silencer case and provided downstream of the silencer case and having a catalyst carrier therein.

It is installed to extend from the exhaust manifold inside the silencer case, the pipe further comprises a plurality of through-holes, the silencer case is provided to surround the outer circumferential surface of the pipe in a spaced position, the noise between the inner peripheral surface and the pipe outer peripheral surface It may be characterized by forming an expansion space for reduction.

It is provided in a ring shape inside the silencer case, the pipe is fitted to the inner circumferential surface, the outer circumferential surface is fixed to the inner circumferential surface of the silencer case, a connection baffle is formed in the side portion communicating hole for communicating the expansion space and the catalyst case with each other; can do.

The connecting baffle is installed on the inner circumferential surface of the other end of the silencer case, and an installation groove is formed on one side facing the catalyst case so that the radial section is U-shaped, and the catalyst case is installed by being inserted into the installation groove. It may be characterized in that it is in communication with the case.

The connecting baffle is installed on the inner circumferential surface of the other end of the silencer case, and an installation groove is formed on one side facing the catalyst case so that the radial section is U-shaped, and the catalyst case is installed by being inserted into the installation groove. It may be characterized in that it is in communication with the case.

The other end of the silencer case is welded to the outer circumferential surface of the catalyst case, the catalyst case is formed such that the inlet portion extends into the silencer case, and a plurality of communication holes are formed along the edge of the inlet portion provided in the silencer case. have.

It is installed so as to extend from the exhaust manifold in the silencer case, and a plurality of through-holes formed on the outer circumferential surface; the inlet portion of the catalyst case may be characterized in that it is in communication with the pipe provided in the silencer case.

The wire mesh may be installed between the outer circumferential surface of the pipe and the inlet of the catalyst case.

The catalyst case may be characterized in that the cross-sectional area is formed to decrease in the longitudinal direction relative to the catalyst carrier.

According to the catalyst integrated silencer having the structure as described above, the catalyst device and the auxiliary silencer are integrally formed to reduce the volume package and manufacturing cost, and shorten the manufacturing time.

In addition, the expansion space of the silencer case is provided to communicate with the catalyst case, so that the length of the expansion space can be secured to the maximum, and ultimately, the low frequency region noise reduction performance can be maximized.

In addition, the high frequency noise can be attenuated using the catalyst carrier provided in the catalyst device, and thus, a separate sound absorbing material does not need to be installed inside the auxiliary silencer, thereby reducing the volume package and manufacturing cost.

1 is a side view showing a catalyst integrated silencer of the present invention;
2 is a perspective view showing the inside of the muffler case in the catalyst integrated silencer according to the first embodiment of the present invention;
Figure 3 is a perspective view showing the interior of the muffler case in a catalyst integrated silencer according to a second embodiment of the present invention,
4 is a perspective view showing a connecting baffle of the present invention;
5 is a view showing in detail the connection relationship between the silencer case, the connection baffle, the catalyst case and the pipe in the catalyst integrated silencer according to the second embodiment of the present invention;
6 is a perspective view showing the inside of the silencer case in the catalyst integrated silencer according to the third embodiment of the present invention;
7 is a side view showing the inside of the muffler case in the catalyst integrated silencer according to the fourth embodiment of the present invention;
8 is a perspective view showing the inside of the muffler case in the catalyst integrated silencer according to the fifth embodiment of the present invention;
9 is a perspective view showing a catalyst case in the fourth and fifth embodiments of the present invention;
10 is a graph showing a change in transmission loss according to the expansion space length of the silencer.

Hereinafter, a catalyst integrated silencer according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a side view showing a catalyst integrated silencer of the present invention, Figure 2 is a perspective view showing the inside of the silencer case in the catalyst integrated silencer according to the first embodiment of the present invention.

First, referring to Figures 1 and 2, the catalyst integrated silencer of the present invention is connected to the exhaust manifold at one end, the cross-sectional area increases in the longitudinal direction is formed so as to reduce the noise of the exhaust gas flowing into the interior A silencer case 10 for reducing; And the cone-shaped inlet 24 is installed to communicate with the other end of the silencer case 10 is provided downstream of the silencer case 10, the catalyst case 20 having a catalyst carrier 22 therein; It may include.

A muffler is a device for reducing the noise from internal combustion engines or ventilators. Such a muffler may be formed to increase the resistance to the exhaust flow to increase the noise reduction effect. As the exhaust flow resistance increases, the interference of sound waves increases, and the exhaust gas pressure and temperature are reduced, so that the noise caused by the exhaust gas emissions is increased. This is effectively reduced.

The present invention is formed so that the cross-sectional area of the muffler case 10 into which the exhaust gas flows in the longitudinal direction, so that the acoustic wave interference occurs due to the change in the cross-sectional area while the exhaust gas flows through the silencer case 10, thereby exhausting Noise is greatly reduced.

1 to 2, the silencer case 10 is formed in a cylindrical shape, and the cross-sectional area is gradually increased, and then is maintained in the same cross-sectional area to a predetermined length and then provided in a shape gradually decreasing back to the original cross-sectional area. Can be.

In addition, the present invention by installing the catalyst case 20 having the catalyst carrier 22 therein so as to communicate with the other end of the muffler case 10, the auxiliary silencer and the catalyst device is formed integrally to the volume package of the exhaust system Can be reduced.

In particular, the catalyst carrier 22 provided inside the catalyst case 20 may additionally play a role of attenuating high frequency noise generated from the auxiliary silencer, without applying a separate sound absorbing material inside the silencer case 10. Thus, the cost and weight of the product can be effectively reduced.

Here, the silencer case 10 may have one end connected to the exhaust manifold and provided at an upstream side of the catalyst case 20.

That is, as shown in FIG. 1, when the silencer case 10 is provided upstream of the catalyst case 20, the catalyst carrier in the catalyst case 20 generates high-frequency noise easily generated in the silencer case 10. 22 may be arranged to attenuate and send back. This is effective for damping the exhaust pulsation pressure, which is the main role of the auxiliary silencer, and can improve the noise reduction effect.

The silencer case 10 according to the first embodiment is formed to form an empty space inside as shown in FIG. 2 and is provided to reduce exhaust noise by using only a cross-sectional change, and the catalyst case 20 is welded to the silencer case 10. Thereby communicating with each other.

Here, the inlet portion of the catalyst case 20 is formed in a cone shape, the cross-sectional area is gradually smaller toward one side, it can be prevented that the catalyst carrier 22 is not fixed.

On the other hand, Figure 3 is a perspective view showing the interior of the muffler case in a catalyst integrated silencer according to a second embodiment of the present invention, Figure 4 is a perspective view showing a connecting baffle of the present invention, Figure 5 is a second of the present invention In the catalyst integrated silencer according to the embodiment is a view showing in detail the connection relationship between the silencer case, the connection baffle, the catalyst case and the pipe.

Referring to FIG. 3, the catalyst integrated silencer according to the second embodiment is installed to extend from the exhaust manifold in the silencer case 10, and a pipe 30 having a plurality of through holes 32 formed on an outer circumferential surface thereof. And, the silencer case 10 is provided to surround the outer circumferential surface of the pipe 30 in a spaced apart position, it can be characterized in that to form an expansion space 12 for noise reduction between the inner circumferential surface and the outer circumferential surface of the pipe 30. have.

In other words, the silencer case 10 is provided with a pipe 30 to receive the exhaust gas from the exhaust manifold, through which a plurality of through-holes 32 formed in the pipe 30 extends the internal region of the pipe 30 and the pipe 30. By further reducing the temperature and pressure while flowing through the space 12, exhaust noise can be induced to be reduced.

Therefore, it is possible to effectively improve the exhaust noise reduction effect through the silencer case (10).

3 to 5, the catalyst integrated silencer is provided in a ring shape inside the silencer case 10, the pipe 30 is fitted to an inner circumferential surface thereof, and the outer circumferential surface is fixed to an inner circumferential surface of the silencer case 10, and a side portion thereof. A connection baffle 40 having a communication hole 42 communicating the expansion space 12 and the catalyst case 20 with each other may be further included.

That is, the connection baffle 40 is a component for fixing the pipe 30 provided in the silencer case 10. The outer circumferential surface is welded along the inner circumferential surface of the silencer case 10, and the pipe 30 is fitted to the inner circumferential surface, so that the pipe 30 may be fixed to the silencer case 10 via the connection baffle 40.

In addition, a plurality of communication holes 42 are formed in the side portion of the connection baffle 40, so that the expansion space 12 of the silencer case 10 and the internal space of the catalyst case 20 communicate with each other.

Therefore, since the inside of the silencer case 10 and the inside of the catalyst case 20 are provided to be integrally communicated with each other, the length of the expanded silencer can be increased to improve the noise reduction effect in the low frequency region.

10 is a graph showing a change in transmission loss according to the expansion space length of the silencer. Referring to FIG. 10, it can be seen that the longer the length of the expansion silencer is, the greater the noise reduction effect in the low frequency region is.

Referring to FIG. 5 again, the connection baffle 40 is installed on the inner circumferential surface of the other end of the silencer case 10, and the installation groove 44 is disposed on one side facing the catalyst case 20 so that the radial cross section is U-shaped. ) Is formed, the catalyst case 20 may be in communication with the silencer case 10 by the inlet portion is inserted into the installation groove 44 is installed.

Here, the connecting baffle 40 is fixed to the silencer case 10 and provided to be coupled while the catalyst case 20 is in communication with each other. The weight of 40) can be reduced.

At this time, the silencer case 10 is welded to the outer circumferential surface of the connecting baffle 40, and the coupling groove 44 is welded to the catalyst case 20. To this end, the connection baffle 40 is provided to be provided inside the other end of the silencer case 10.

In addition, a wire mesh 50 may be installed between the outer circumferential surface of the pipe 30 and the inner circumferential surface of the connecting baffle 40.

Since the silencer case 10 and the catalyst case 20 are provided in different configurations, a difference in thermal expansion may occur. The wire mesh 50 may absorb the difference in thermal expansion between the outside of the pipe 30 and the inner circumferential surface of the connecting baffle 40. Can be prepared. Therefore, durability of a catalyst integrated silencer can be ensured.

In addition, the catalyst case 20 may be formed such that the cross-sectional area decreases in the longitudinal direction based on the catalyst carrier 22.

This is because the catalyst carrier 22 is made of a ceramic material, the breakage may occur when the catalyst case 20 is pushed or moved inside the catalyst case 20, the catalyst carrier 22 is a specific position according to the reduction in the cross-sectional area of the catalyst case 20 Arrange to be fixed at

On the other hand, Figure 6 is a perspective view showing the inside of the silencer case in the catalyst integrated silencer according to the third embodiment of the present invention.

Referring to FIG. 6, in the catalyst integrated silencer according to the third embodiment, the connection baffle 40 may be formed at a free position inside the silencer case 10 and may not be provided to be coupled to the catalyst case 20. The length of the pipe 30 can also be adjusted accordingly. This is to tune the frequency of the exhaust noise that is a problem depending on the position of the connection baffle (40).

On the other hand, Figure 7 is a side view showing the inside of the silencer case in the catalyst integrated silencer according to the fourth embodiment of the present invention. Referring to FIG. 7, the other end of the silencer case 10 of the catalyst integrated silencer according to the fourth embodiment is welded to the outer circumferential surface of the catalyst case 20, and the catalyst case 20 has an inlet portion 24 of the silencer case. 10 is formed to extend into the inside, a plurality of communication holes 26 can be formed along the edge of the inlet portion 24 provided in the silencer case (10).

That is, without installing a separate connecting baffle, by forming a communication hole in the inlet portion 24 of the catalyst case 20 may be provided to communicate with each other while the silencer case 10 and the catalyst case 20 are integrally installed. have. To determine the shape of the specific communication hole through FIGS. 8 to 9.

8 is a perspective view showing the interior of the silencer case in the catalyst integrated silencer according to the fifth embodiment of the present invention, and FIG. 9 is a perspective view showing the catalyst cases in the fourth and fifth embodiments of the present invention.

8 and 9, the catalyst integrated silencer according to the fifth embodiment is installed to extend from the exhaust manifold in the silencer case 10, and a pipe having a plurality of through holes 32 formed on an outer circumferential surface thereof; Further comprising, the inlet portion 24 of the catalyst case 20 may be in communication with the pipe 30 provided in the silencer case (10).

As shown in FIG. 9, a wire mesh 50 may be installed between the outer circumferential surface of the pipe 30 and the inlet portion 24 of the catalyst case 20.

In the embodiment in which the pipe 30 is provided in the silencer case 10, the catalyst case 20 and the silencer case 10 are welded to each other without a separate connecting baffle, and the communication holes 26 communicate with each other. It is characterized by forming a).

According to the catalyst integrated silencer having the structure as described above, the catalyst device and the auxiliary silencer are integrally formed to reduce the volume package and manufacturing cost, and shorten the manufacturing time.

In addition, the expansion space of the silencer case is provided to communicate with the catalyst case, so that the length of the expansion space can be secured to the maximum, and ultimately, the low frequency region noise reduction performance can be maximized.

In addition, the high frequency noise can be attenuated using the catalyst carrier provided in the catalyst device, and thus, a separate sound absorbing material does not need to be installed inside the auxiliary silencer, thereby reducing the volume package and manufacturing cost.

While the invention has been shown and described with respect to particular embodiments, it is within the skill of the art that various changes and modifications can be made therein without departing from the spirit of the invention provided by the following claims. It will be obvious to those of ordinary knowledge.

10: silencer case
12: expansion space
20: catalyst case
22: catalyst carrier
24: entrance
26: communication hall
30: pipe
32: through
40: connecting baffle
42: communication hole
50: wire mesh

Claims (9)

An exhaust manifold connected to one end and formed in such a manner that the cross-sectional area increases and decreases in the longitudinal direction to reduce noise of the exhaust gas introduced into the silencer case; And
And a catalyst case having a cone-shaped inlet part installed in communication with the other end of the muffler case and provided downstream of the muffler case and having a catalyst carrier therein. The method according to claim 1,
A pipe installed in the silencer case so as to extend from the exhaust manifold and having a plurality of through holes formed on an outer circumferential surface thereof;
The silencer case is provided to surround the outer circumferential surface of the pipe at a spaced position, thereby forming an expansion space for noise reduction between the inner circumferential surface and the outer circumferential surface of the pipe. The method according to claim 2,
It is provided in a ring shape inside the silencer case, the pipe is fitted to the inner circumference, the outer circumference is fixed to the inner circumference of the silencer case, a connection baffle formed in the side portion communicating hole for communicating the expansion space and the catalyst case with each other; Catalyst integrated silencer. The method according to claim 3,
The connecting baffle is installed on the inner circumferential surface of the other end of the silencer case, and an installation groove is formed on one side facing the catalyst case so that the radial section is U-shaped.
The catalyst case is a catalyst integrated silencer, characterized in that the inlet portion is inserted into the installation groove is communicated with the silencer case. The method according to claim 4,
The connecting baffle is installed on the inner circumferential surface of the other end of the silencer case, and an installation groove is formed on one side facing the catalyst case so that the radial section is U-shaped.
The catalyst case is a catalyst integrated silencer, characterized in that the inlet portion is inserted into the installation groove is communicated with the silencer case. The method according to claim 1,
The other end of the silencer case is welded to the outer peripheral surface of the catalyst case,
The catalyst case is formed so that the inlet portion extends into the silencer case, the catalyst integrated silencer, characterized in that a plurality of communication holes are formed along the edge of the inlet portion provided in the silencer case. The method according to claim 6,
It is installed to extend from the exhaust manifold inside the muffler case, and further comprising a plurality of pipes formed in the outer peripheral surface;
The catalyst integrated silencer, characterized in that the inlet portion of the catalyst case is in communication with the pipe provided inside the silencer case. The method according to claim 7,
Catalyst integrated silencer, characterized in that the wire mesh is installed between the outer peripheral surface of the pipe and the inlet of the catalyst case. The method according to claim 1,
The catalyst case is a catalyst integrated silencer, characterized in that the cross-sectional area is reduced as the distance away from the catalyst carrier in the longitudinal direction.

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