KR200482661Y1 - Muffler for preventing flowing backward for a vehicle - Google Patents

Abstract

The present invention discloses a muffler for a vehicle for preventing reverse flow of exhaust gas.
According to the present invention, there is provided a muffler for a vehicle for preventing reverse flow of exhaust gas, comprising: a case in which an inner space is formed; An exhaust pipe for discharging the exhaust gas generated in the engine to the atmosphere and at least a part of which is accommodated in the case; A first partition wall partitioning the inside of the case into a plurality of spaces and passing through the exhaust pipe; And an inclined portion that extends from the first partition wall side to the exhaust gas outlet end of the exhaust pipe with a smaller cross section and forms a first space between the outside of the first partition and the exhaust pipe and the inside of the case There is provided a muffler for a vehicle for preventing reverse flow of exhaust gas.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for pre-

The present invention relates to a muffler for a vehicle for preventing reverse flow of exhaust gas.

BACKGROUND ART An intake system that supplies air (intake air) introduced from the outside to an engine for driving an internal combustion engine such as an automobile generally includes an air cleaner, an intake manifold, a throttle body, a surge tank, Fold.

1, the exhaust system includes an exhaust manifold 100, an air purifier (catalytic converter) 102, a sub silencer 104, and a main silencer 106, The high-pressure exhaust gas is purified and discharged to the outside, and the high-frequency noise is reduced.

In order to increase the output of the automobile and reduce pollutants, it is also important to supply sufficient intake air (air) from the intake system, but it is also important to smoothly exhaust the exhaust gas generated by the combustion in response to this.

That is, it is necessary to prevent backflow of the exhaust gas flowing back into the exhaust system.

Particularly, in the exhaust system, the process of exhausting the exhaust gas due to the combustion process of the fuel in the four strokes of the automobile generally composed of the intake stroke, the compression stroke, the explosion stroke and the exhaust stroke must be performed quickly so that the entire process can be smoothly performed continuously And the stagnation of the exhaust gas causes incomplete combustion of the fuel in the combustion chamber in the engine.

In the process of discharging from the cylinder of the vehicle to the exhaust pipe of the silencer (main muffler), there is a time when a so-called valve overlap occurs in which the intake valve and the exhaust valve simultaneously open instantaneously during four strokes of the engine in the exhaust manifold.

In this process, the exhaust gas is reintroduced into the cylinder, and a vacuum state is instantly formed in the exhaust manifold. As a result, the exhaust gas can not be exhausted and the backflow phenomenon occurs.

There is a problem that the output of the vehicle in the exhaust gas backwash phenomenon is lowered and the fuel consumption is reduced.

Korean Unexamined Patent Publication No. 2007-0099259 (automobile exhaust port) is fitted to the tail pipe end and a structure is proposed in which the exhaust gas flowing from the counterflow inlet is discharged through the venturi channel.

However, according to this conventional technique, the reverse flow must be introduced only through the reverse flow inlet arranged annularly at the end of the exhaust port, and the inflow reverse flow must be discharged along the venturi channel so that the capacity of the reverse flow is small and the reverse flow is not the reverse flow inlet There is a problem that the resistance increases when the air flows into the center of the vent hole.

On the other hand, when the exhaust valve is opened, the exhaust gas is discharged at a pressure of about 3 to 5 bar. At this time, if the silencer is discharged into the air without passing through the exhaust muffler, the exhaust gas collides with the atmosphere, resulting in a strong impact sound (noise). The sound pressure level at the exhaust valve is about 60 to 150 dB (A).

The temperature of the exhaust gas is about 600 to 900 DEG C, and the discharge speed is close to the sonic speed.

In such an environment, a silencer is provided to lower the pressure and temperature before discharging the exhaust gas to the atmosphere, thereby suppressing sounding due to abrupt expansion.

2 is a view showing a main muffler according to the prior art.

2, the conventional main muffler includes a casing 200 made of a cylindrical steel plate having a thickness of 1 mm and includes at least one partition 202-1, 202-2 are provided.

Here, at one end of the case 200 is provided an input pipe 204 which is cylindrical and has a plurality of pores 203, and an output pipe 206 is provided adjacent to the input pipe 204.

The output pipe 206 is disposed adjacent to the input pipe 204 and is cylindrical and has a plurality of pores. Further, the output pipe 206 protrudes to the other end of the case 200.

This relates to the structure of a reflective muffler, which allows exhaust gases to pass staggeredly to reduce pressure and speed.

As described above, the conventional silencer only focuses on reducing the noise and the pressure of the exhaust gas by lowering the pressure and the speed of the exhaust gas. However, the structure for preventing the exhaust gas backflow phenomenon is not adopted.

In order to solve the problems of the prior art, the present invention proposes a muffler for a vehicle to prevent exhaust gas reverse flow which can improve the output of the engine and reduce fuel consumption by efficiently performing the exhaust process.

According to an aspect of the present invention, there is provided a muffler for a vehicle for preventing reverse flow of exhaust gas, the muffler comprising: a case having an inner space formed therein; An exhaust pipe for discharging the exhaust gas generated in the engine to the atmosphere and at least a part of which is accommodated in the case; A first partition wall partitioning the inside of the case into a plurality of spaces and passing through the exhaust pipe; And an inclined portion that extends from the first partition wall side to the exhaust gas outlet end of the exhaust pipe with a smaller cross section and forms a first space between the outside of the first partition and the exhaust pipe and the inside of the case There is provided a muffler for a vehicle for preventing reverse flow of exhaust gas.

The inclined portion includes one end located on the first partition wall side and the other end positioned on the end of the exhaust pipe, and the case may include an extension portion extending from the other end of the inclined portion in a direction parallel to the exhaust pipe.

The other end of the inclined portion is located on the outer side of the exhaust pipe. The cross sectional area of the extended portion is larger than the cross sectional area of the exhaust pipe. The distance between the other end of the inclined portion and the exhaust pipe end may be in the range of 5 to 50 mm.

And a tail portion that engages with the extended portion, wherein the tail portion includes a U-shaped insertion portion into which the extended portion is inserted while having an internal space; And an engaging portion disposed in the U-shaped insertion portion and engaged with the extended portion.

And the inner cross-sectional area formed by the U-shaped insertion portion is preferably larger than the cross-sectional area of the exhaust pipe.

The case includes: a first end plate formed on a side to which the exhaust gas flows; And a second end plate formed on a side from which the exhaust gas is discharged, wherein the inclined portion may extend from the first partition wall side to the second end plate side with a shape having a small cross section.

The first partition may have a curved shape from the case toward the exhaust pipe.

The inclined portion may have a straight or curved shape.

According to the present invention, the exhaust gas can be smoothly discharged by forming a space capable of accommodating the exhaust gas flowing back into the silencer.

1 is a view showing a general exhaust system.
2 is a view showing a muffler structure according to the prior art.
3 is a view showing a muffler structure for preventing backflow of exhaust gas according to a preferred embodiment of the present invention.
4 is a view showing a state of engagement of an extension part of a silencer and a tail part according to the present invention.
FIG. 5 is a view showing an assembled state of the extension part and the tail part of the muffler according to another preferred embodiment of the present invention.
6 is a view showing a silencer structure for preventing backflow of exhaust gas according to another preferred embodiment of the present invention.
7 is a view showing a muffler structure for preventing reverse flow of exhaust gas according to a preferred embodiment of the present invention.
FIG. 8 is a view showing a silencer structure for preventing reverse flow of exhaust gas according to a preferred embodiment of the present invention. FIG.
FIG. 9 is a view showing a silencer structure for preventing reverse flow of exhaust gas according to a preferred embodiment of the present invention. FIG.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail. It should be understood, however, that the appended claims are not intended to limit the invention to the particular embodiments, but to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a muffler for a vehicle for preventing backflow of exhaust gas according to a preferred embodiment of the present invention.

3 is a view showing a structure of a reflection type silencer in which a plurality of exhaust pipes are staggered.

3, the muffler according to the present embodiment includes a case 300, a plurality of exhaust pipes 302-1 and 302-2 (hereinafter, referred to as '302'), and at least one partition wall 304-1 , 304-2, 304-3, hereinafter referred to as " 304 ").

The case 300 forms an internal space, and is partitioned into one or more spaces by the partition 304.

The exhaust pipe 302 discharges the exhaust gas generated in the engine to the atmosphere, at least a part of which is accommodated in the case 300 and is installed through at least one partition wall 304.

3, the exhaust pipe 302 may include an input pipe 302-1 and an output pipe 302-2, and may include an input pipe 302-1 having a plurality of pores, (302-2) are staggered from each other.

According to one preferred embodiment of the present invention, on the side where the output pipe 302-2 of the case 300 is located, that is, on the exhaust gas discharge side of the exhaust pipe 302, a point passing through the first partition wall 304-1 An inclined portion 310 extending to the distal end 320 of the output pipe 302-2 and an extended portion 312 extending from the inclined portion 310 are formed.

The first partition 304 - 1 may be an end plate in a conventional silencer, and the first partition 304 - 1 may be an end plate. The first partition 304 - It is also within the scope of the present invention that the inclined portion 310 and the extending portion 312 as shown in FIG. 3 are combined with the end plate on the side to be discharged.

In FIG. 3, the inclined portion has a linear shape and a small cross-section, but it may have a curved shape as shown in FIG.

3, the inclined portion 310 includes one end 330 located on the first partition wall 304-1 side and the other end 332 located on the end of the output pipe 302-2 .

At this time, the extension portion 312 extends from the other end 332 of the inclined portion 310 in the direction parallel to the output pipe 302-2, that is, in the direction parallel to the exhaust gas outlet direction.

According to the present embodiment, the inclined portion 310 forms the first space S surrounded by the inclined portion 310, the first partition wall 304-1, and the output pipe 302-2.

More specifically, the inclined portion 310 has one end 330 positioned at a predetermined depth from the distal end 320 of the output pipe 302-2 and the other end 332 positioned at the distal end 320 of the output pipe 302-2. And accommodates at least a part of the output pipe 302-2.

Preferably, the other end 332 of the inclined portion is located on the outside of the output pipe end 420, that is, on the side from which the output pipe 302-2 discharges the exhaust gas, and the distance from the other end 332 to the distal end 320 And may have a range of 5 to 50 mm.

The space formed by the distance from the other end 332 to the distal end 320 is defined as an inlet through which the backward flow exhaust gas flows into the first space S and the exhaust gas flowing backward when the inlet has an appropriate size Can be introduced into the first space S while preventing the first space S from flowing into the output pipe 302-2.

According to one embodiment of the present invention, the first space S receives exhaust gas (flowing backward) through the extension 312, and the accommodated exhaust gas is again exhausted through the extension 312 .

The exhaust gas flowing backward is not introduced into the output pipe 302-2 because the diameter of the exhaust gas is increased from the other end 332 of the inclined portion 310 to the one end 330 when the exhaust gas flows backward, And can be guided to the first space S along an inclined surface formed by an inclined portion 310.

The exhaust gas flowing into the first space S is discharged to the outside together with the exhaust gas discharged through the output pipe 302-2 when the pressure of the exhaust manifold rises in a vacuum state.

As described above, an extension portion 312 extending from the other end 332 of the inclined portion 310 toward the exhaust gas outlet side is provided.

As shown in FIG. 4, the extension 312 can be coupled with the tee 340.

The tail portion 340 according to the present embodiment includes a U-shaped insertion portion 342 into which the extension portion 310 is inserted while forming an internal space.

The U-shaped insertion portion 342 is inserted into the extended portion 312 and the extended portion 312 and the U-shaped insertion portion 342 are connected to each other through the coupling portion (not shown) can do.

When the U-shaped inserting portion 342, the output pipe 302-2 and the extending portion 312 are formed in a cylindrical shape, the inner diameter (as shown in Fig. 4) formed by the U- c may be formed to be larger than the diameter a of the output pipe 302-2 and smaller than the diameter b of the extension 312. [

Further, according to the present embodiment, the diameter b of the extending portion 312 is formed to be larger than the diameter of the output pipe 302-2 for preventing backflow of exhaust gas.

As described above, the size of each cross section can be made smaller in the order of the extension portion 312, the U-shaped insertion portion 342, and the output pipe 302-2.

The exhaust gas flowing back through the tail portion 340 passes through the inclined portion 310 through the extended portion 312 having a larger diameter than the U-shaped insertion portion 342 of the tail portion 340, As shown in FIG.

The length d1 from the distal end 320 of the output pipe 302-2 to the other end 332 of the inclined portion 310 is greater than the length d1 of the other end 332 of the inclined portion 310 Is smaller than the length (d2) to the distal end (344) of the U-shaped insertion portion (342). When d1 is set to be smaller than d2, the exhaust gas flowing back through the tail portion 340 can smoothly flow into the first space S along the inclined surface formed on the inclined portion 310 along the inner peripheral surface.

5 is a diagram showing a configuration of a vehicle backflow prevention device according to another embodiment of the present invention.

5, the stem 500 according to another embodiment of the present invention is located inside the extension portion 312 while being connected to the inside of the extension portion 312 through the engagement portion 502, Shape.

In addition, a slant-shaped piece 504 is formed between the inner peripheral surface and the outer peripheral surface of the ring-shaped tail portion 500 according to the present embodiment (the right side of Fig. 5 is a cross-sectional view taken along line A-A ').

According to this structure, the backflowing exhaust gas can be introduced into the ring-shaped portion of the tail portion 500, thereby preventing the exhaust gas from directly flowing into the output pipe 302-2.

3, a structure for forming an inclined surface for preventing backflow in the reflection type silencer has been described.

6 is a view showing a structure of a sound absorbing silencer according to another preferred embodiment of the present invention.

As shown in Fig. 6, the sound absorbing silencer may include a case 600, an exhaust pipe 602 having a plurality of pores, and a sound absorbing material 604.

The conventional sound-absorbing silencer includes one exhaust pipe which is not divided into an input pipe and an output pipe.

In the sound absorbing silencer according to one embodiment of the present invention, the inclined portion 610 and the extending portion 612 having the same shape as in Fig. 3 are formed on one side of the case 600, that is, on the exhaust gas outlet side. Further, inside the case 600, there is provided a partition wall 606 through which the exhaust pipe 602 passes and divides a space.

In the sound absorbing silencer, one end 612 of the inclined portion 610 is located on the side of the partition wall 606 and the other end 614 of the inclined portion 610 is extended to the end 620 of the exhaust pipe 602.

The extended portion 612 extends in the direction parallel to the exhaust pipe 602 at the other end 614 of the inclined portion 610.

Although the case structure for preventing the back flow of the exhaust gas to the reflection type silencer and the sound absorption type silencer has been described above, the present invention is not limited to this case, but may be applied to all silencers having resonance type, resistance type, It should be understood by those skilled in the art.

8 is a view showing the structure of a muffler for a vehicle according to another embodiment of the present invention.

8 shows a case 800 in which a first end plate 802 formed on the side where exhaust gas is introduced and a second end plate 804 formed on the side where exhaust gas is exhausted, 802 and a second end plate 804, as shown in FIG.

That is, it is a structure for forming a first space S, which receives the exhaust gas flowing back into the interior of the muffler while maintaining the existing muffler structure.

Referring to FIG. 8, a first partition wall 806 is provided to partition the case 800 into a plurality of spaces, and the exhaust pipe 808 penetrates the first partition wall 806.

Also, an inclined portion 810 is provided which extends in a shape such that its cross section is reduced from the first barrier rib 806 or from the side adjacent to the first barrier rib 806 toward the second end plate 804 side.

8, the other end 812 of the inclined portion 810 may be located at the outside of the exhaust pipe 808, preferably at a position where it meets the second end plate 804, and the extension 814 Extends outwardly of the case 800 from the second end plate 804 side.

In FIG. 8, the inclined portion 810 is shown as a straight line. However, as shown in FIG. 9, the inclined portion 810 may have a curved shape.

Also, the first partition 806 provided for forming the first space may have a curved shape instead of a straight shape.

While the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention. The appended claims are to be considered as falling within the scope of the following claims.

Claims (9)

A muffler for a vehicle for preventing exhaust gas reverse flow,
A case in which an inner space is formed;
An exhaust pipe for discharging the exhaust gas generated in the engine to the atmosphere and at least a part of which is accommodated in the case;
A first partition wall partitioning the inside of the case into a plurality of spaces and passing through the exhaust pipe; And
And an inclined portion extending toward the exhaust gas outlet side end of the exhaust pipe with a smaller cross section at the first partition wall side and forming a first space between an outer side of the first partition and the exhaust pipe and an inner side of the case ,
Wherein the inclined portion includes one end located on the first partition wall side and the other end located on the end of the exhaust pipe,
Wherein the case includes an extension extending from the other end of the inclined portion in a direction parallel to the exhaust pipe,
And the other end of the inclined portion is located outside the exhaust pipe toward the outlet side of the exhaust gas, and the cross-sectional area of the extended portion is larger than the cross-
The distance from the other end of the inclined portion to the end of the exhaust pipe has a range of 5 to 50 mm,
And an inlet port through which the exhaust gas flowing backward due to the distance from the other end of the inclined portion to the end of the exhaust pipe is introduced into the first space is formed. delete delete delete The method according to claim 1,
And a tail portion coupled to the extended portion,
Wherein the tail portion comprises:
A U-shaped insertion portion into which the extension portion is inserted while having an internal space; And
And an engaging portion disposed inside the U-shaped insertion portion and engaged with the extended portion. 6. The method of claim 5,
Wherein the inner cross-sectional area formed by the U-shaped inserting portion is larger than the cross-sectional area of the exhaust pipe. The method according to claim 1,
In this case,
A first end plate formed on a side to which the exhaust gas flows; And
And a second end plate formed on a side from which the exhaust gas is discharged,
Wherein the inclined portion extends from the first partition wall side to the second end plate side in a shape of a small cross section, and prevents the reverse flow of the exhaust gas. The method according to claim 1,
Wherein the first partition wall has a curved shape from the case to the exhaust pipe side. The method according to claim 1,
Wherein the inclined portion has a straight or curved shape.

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