KR20020015115A - Muffler - Google Patents

Abstract

PURPOSE: A muffler for a vehicle is provided to prevent endurance of a turbo from dropping caused by increasing exhaust temperature and to prevent heat damage of component caused by the increasing of the exhaust temperature. CONSTITUTION: A muffler in a vehicle comprises an exhaust pipe discharging exhaust gas; a case(23) composed by an upper and lower cases(21,22) by being mounted on a main muffler(20); a hollow pipe formed in the middle portion of the upper and lower cases; first, second and third baffles(41,42,43) vertically mounted in the case as a porous plate; plural chambers(31,32,33,34) divided by the plural baffles; an inlet pipe(51) letting in the exhaust gas; a discharge pipe(52) discharging the exhaust gas; a middle pipe(53) formed between the inlet pipe and the discharge pipe; a sound suction material(60) composed of glass wool by being mounted on the fourth chamber; and a pipe(54) surrounding the sound suction material by having a hole(54a). Thereby, the muffler in the vehicle prevents endurance of a turbo from dropping caused by increasing exhaust temperature.

Description

Muffler of car {Muffler}

The present invention relates to a muffler of an automobile, and more particularly, to reduce engine output due to excessive exhaust back pressure and to prevent a decrease in durability of the turbocharger due to an increase in exhaust temperature, and to increase the temperature of a peripheral portion due to an increase in the turbocharger exhaust temperature. The present invention relates to a muffler of a vehicle for preventing thermal deterioration of peripheral parts.

In general, the exhaust gas emitted from the engine includes explosion noise generated during combustion of the engine, and a muffler is installed in the vehicle to reduce such noise.

Figure 4 shows a conventional automotive muffler,

The case 1 is constituted, and a plurality of baffles 6 for partitioning the inside of the case 1 into the first to fourth chambers 2 to 5 are formed in the case 1 in a vertical direction.

In addition, an inlet pipe 7 for receiving exhaust gas discharged from the engine is formed inside the case 1 so that one side thereof communicates with the outside of the case 1 and the other side thereof communicates with the second chamber 3. , The discharge pipe 8 is formed so that one side is in communication with the first chamber 2 and the other side is in communication with the outside of the case (1).

The first to third flow pipes (9, 10, 11) for circulating the inside of the case (1) through the inlet pipe 7 to be discharged to the atmosphere through the discharge pipe (8) the case ( 1) It is installed inside, the first flow tube 10 is formed to connect the third chamber 4 and the fourth chamber 5, the third flow tube 11 is the first chamber 2 and the third chamber (4) is formed to connect.

On the outer circumferential surface of the third flow pipe 11, a plurality of flow holes 12 are formed to guide the exhaust gas supplied through the inflow pipe 7 to move toward the first chamber 2.

The operation of the conventional muffler configured as described above is as follows.

Exhaust gas discharged from the engine flows through the inlet pipe 7, some of which are spread into the second chamber 3, and some of which are moved through the first flow pipe 9 to the fourth chamber 5. Supplied.

The exhaust gas supplied to the fourth chamber 5 moves back to the second chamber 4 through the third flow tube 10, and the exhaust gas moved to the second chamber 4 passes through the third flow tube 11. The exhaust gas moved along the second chamber 4 is moved along the third flow pipe 11 and supplied to the first chamber 2.

Meanwhile, the exhaust gas supplied to the second chamber 3 through the inflow pipe 7 moves to the first chamber 2 through the plurality of flow holes 12 formed in the third flow pipe 11. .

As described above, the exhaust gas moved to the first chamber 2 is discharged into the atmosphere through the discharge pipe 8, and as described above, the exhaust gas introduced into the inlet pipe 7 is divided into several chambers 2 to 2. 5) and the exhaust noise contained in the exhaust gas is attenuated in the process of moving the flow pipe (9 ~ 11).

However, the conventional muffler has a problem in that the durability of the turbocharger is reduced due to the decrease in engine output and the exhaust temperature rise due to the excessive exhaust back pressure, and the peripheral parts are deteriorated due to the temperature increase in the peripheral portion due to the increase in the exhaust temperature of the turbocharger. .

Accordingly, the present invention has been made in view of the above-mentioned problems, and more particularly, reduces engine output due to excessive exhaust back pressure and prevents a decrease in durability of the turbocharger due to an increase in exhaust temperature. It is an object of the present invention to provide a muffler to prevent thermal damage of peripheral components due to the temperature rise of the.

The present invention as a means for achieving the above object,

A case having an upper case and a lower case engaged to form a space therein;

First to third baffles having a perforated plate vertically installed at predetermined intervals in the case to partition the inside of the case into first to fourth chambers;

An inlet pipe having one side communicating with the outside of the case and the other side communicating with the third chamber in a horizontal direction inside the case to be an inflow passage of the exhaust gas discharged from the engine;

A discharge pipe having one side communicating with the first chamber and the other side communicating with the outside of the case so that the exhaust gas introduced into the case is discharged to the outside;

An intermediate pipe having both ends fixed to the first baffle and the second baffle so as to connect the first chamber and the third chamber to the side surfaces of the inlet pipe and the outlet pipe;

A sound absorbing material filled in a space of the fourth chamber and an outer circumference of the discharge pipe passing through the third chamber to attenuate exhaust noise and exhaust heat; Characterized in that consists of,

The middle portion of the upper and lower case circumference constituting the case is formed wrinkles, one side of the lower case to form a low height and the other side to form a high height, characterized in that the overall shape of the case made of a rhombus,

The inlet pipe and the outlet pipe are vertically positioned with each other, and a portion of the front portion of the inlet pipe is bent downward.

1 is a front sectional view of a muffler according to the present invention.

2 is a cross-sectional view for explaining the flow of the exhaust gas of the muffler according to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a view showing an exhaust system with a muffler mounted according to the present invention.

5 is a view for explaining the exhaust gas flow in the muffler during high-speed driving.

6 is a view for explaining the exhaust gas flow in the muffler during high-speed driving.

7 is a view for explaining a conventional technology.

※ Explanation of code for main part of drawing

20: main muffler 21: upper case

22: lower case 23: case

31 to 34: first chamber to fourth chamber

41 to 43: 1st to 3rd baffles

51: inlet pipe 52: outlet pipe

53: intermediate pipe 60: sound absorbing material

100: exhaust pipe

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the muffler according to the present invention, Figure 2 is a cross-sectional view for explaining the flow of the exhaust gas of the muffler according to the present invention, Figure 3 is a cross-sectional view taken along line AA of FIG. 5 is a view illustrating an exhaust system in a state in which a muffler is mounted according to the present invention, and FIGS. 5 and 6 are diagrams for describing an exhaust gas flow in a muffler at high speed and low speed.

In the figure, reference numeral 20 is a main muffler formed in the middle of the exhaust system to reduce exhaust noise and heat of the exhaust gas.

The main muffler 20 is formed in the middle of the exhaust pipe 100 so that the exhaust gas is introduced into one side and the offset exhaust gas is discharged to the other side.

The case 23 of the main muffler 20 is configured by engaging the upper case 21 and the lower case 22 up and down, wherein the middle portion of the upper and lower cases 21 and 22 is a plurality of bends. It consists of a formed corrugated pipe.

In particular, since the lower case 22 has a low height of the exhaust gas inlet side and a high side of the other side, the overall shape of the case 23 forms a rhombus.

Inside the case 23, first to third baffles 41 to 43 formed of a porous plate are vertically installed at predetermined intervals, and the case 23 is formed by the first to third baffles 41 to 43. The interior of the compartment is partitioned into first to fourth chambers 31 to 34.

Inside the case 23, an inlet pipe 51 through which the exhaust gas flows in, a discharge pipe 52 through which the exhaust gas is discharged, and an intermediate pipe side by side of the inlet pipe 51 and the discharge pipe 52 are arranged side by side. 53).

The inlet pipe 51 is formed in the horizontal direction inside the case 23 so that one side is in communication with the outside of the case 23, the other side is in communication with the third chamber 33 to remove the exhaust gas discharged from the engine Guided to three chambers. In particular, the section of the inlet pipe 51 passing through the first chamber 31 is formed bent downward.

The discharge pipe 52 is configured such that one side of the discharge pipe 52 communicates with the first chamber 33 and the other side communicates with the outside of the case 23 so that the exhaust gas introduced into the case 23 is discharged to the outside. The discharge pipe 52 is formed perpendicular to each other with the inlet pipe 51 as shown in the figure.

The intermediate pipe 53 is the first baffle 41 and the second baffle 42 to connect the first chamber 31 and the third chamber 33 to the side of the inlet pipe 51 and the discharge pipe 52. Both ends of the pipe are fixed to each other, and the intermediate pipe 53 is a discharge pipe 52 communicating the exhaust gas introduced into the third chamber 33 through the inlet pipe 51 with the first chamber 31. ) To induce.

In addition, a plurality of perforation holes 51a, 52a, and 53a are formed in the middle of the inflow pipe 51, the discharge pipe 52, and the intermediate pipe 53 that cross the second chamber 32.

The fourth chamber 34 is filled with a sound absorbing material 60 formed of glass wool, and the sound absorbing material on the outer circumferential surface of the discharge pipe 52 passing through the third chamber 33 as shown in the drawing. 60 is wrapped.

The sound absorbing material 60 formed in the middle of the discharge pipe 52 is wrapped by a separate pipe 54 having a perforation hole 54a formed on the outer circumference thereof, and in the section of the discharge pipe 52 where the sound absorbing material 60 is located. A plurality of perforation holes 52b are formed.

Referring to the mounting and operation of the muffler configured as described above are as follows.

When the engine is started, exhaust gas is discharged, and the exhaust gas is introduced into the main muffler 20 through an exhaust pipe through an exhaust system.

Exhaust gas introduced into the inlet pipe 51 of the main muffler 20 flows to the third chamber 34 along the inlet pipe, wherein perforations formed in the middle of the inlet pipe 51 according to the density and the flow rate of the exhaust gas. Part of the exhaust gas exits the hole 51a and flows into the second chamber 32.

The exhaust gas strongly introduced into the third chamber 34 flows into the fourth chamber 34 filled with the sound absorbing material 60 through the perforation hole 43a of the third baffle 43 and then attenuates again. 33). Exhaust gas, which is attenuated to some extent while passing through the sound absorbing material 60 filled in the fourth chamber 34 and introduced into the third chamber 33, enters the intermediate pipe 53 communicating with the third chamber 33, and thus, the first gas. Guided to chamber 31. At this time, the exhaust gas flowing into the perforation hole 51a of the inflow pipe 51 flows into the perforation hole 53a of the intermediate pipe 53 and is led to the first chamber 31 from the third chamber 33. Together with the first chamber 31.

The exhaust gas guided to the first chamber 31 is introduced into the discharge pipe 52 communicating with the first chamber 31 and discharged to the outside of the case 23 to be connected to the discharge pipe 52. To flow out. In this process, a part of the exhaust gas flowing into the exhaust pipe 52 passes through the perforation hole 52a of the exhaust pipe 52 passing through the second chamber 32 according to the density and the flow rate of the exhaust gas. ), Or flows into the third chamber 33 through the perforation hole 52b formed in the middle of the third chamber 33. The exhaust gas flowing out from the discharge pipe 52 to the second chamber 32 and the third chamber 33 flows back into the first chamber 31 through the intermediate pipe 53. Exhaust gas flowing into the third chamber 33 through the perforation hole 52b of the discharge pipe 52 formed in the middle of the third chamber 33 passes through the sound absorbing material 60 formed on the outer circumference of the discharge pipe 52. After being attenuated, it flows into the intermediate pipe 53.

That is, the flow of the exhaust gas introduced into the muffler 20 according to the traveling speed of the vehicle is as follows. At the time of high speed driving, after passing through the perforation hole 51a of the inflow pipe 51 and passing through the perforation hole 53a of the intermediate pipe 53 to the perforation hole 52a of the discharge pipe 52 as shown in FIG. do. On the contrary, during low-speed driving, the exhaust gas discharged from the discharge end 51b of the inlet pipe 51 is guided to the inlet end 52c of the discharge pipe 52 via the intermediate pipe 53 and exhausted as shown in FIG. 6.

The muffler configured as described above prevents the engine output due to the excessive exhaust back pressure and the durability of the turbocharger due to the increase in exhaust temperature, and the thermal damage of the peripheral parts due to the temperature increase in the peripheral portion due to the increase in the exhaust temperature of the turbocharger. There is a great effect to prevent.

Claims (4)

A case 23 in which the upper case 21 and the lower case 22 are engaged to form a space therein; First to third baffles 41 to 43 having a perforated plate vertically installed at predetermined intervals in the case 23 to partition the inside of the case 23 into first to fourth chambers 31 to 34. and; One side is in communication with the outside of the case 23, the other side is formed in the horizontal direction inside the case 23 so as to communicate with the third chamber 33 is an inlet pipe 51 which is an inlet for the exhaust gas discharged from the engine Wow; A discharge pipe 52 having one side communicating with the first chamber 31 and the other side communicating with the outside of the case 23 so that the exhaust gas introduced into the case 23 is discharged to the outside; Both ends are fixed to the first baffle 41 and the second baffle 42 so as to connect the first chamber 31 and the third chamber 33 to the side surfaces of the inlet pipe 51 and the outlet pipe 52. An intermediate pipe 53 formed; A sound absorbing material 60 filled in the space of the fourth chamber 34 and the outer circumference of the discharge pipe 52 passing through the third chamber 33 to reduce exhaust noise and exhaust heat; Muffler of the vehicle, characterized in that consisting of. The method of claim 1, The middle portion around the upper and lower cases 21 and 22 constituting the case 23 is formed with wrinkles, and one side of the lower case 22 forms a low height and the other side forms a high height of the case 23. A muffler for an automobile, wherein the overall shape is made of a rhombus. The method of claim 1, wherein The inlet pipe 51 and the discharge pipe 52 is located perpendicular to each other, the front portion of the inlet pipe 51, muffler of the vehicle, characterized in that bent downwardly bent. The method of claim 1, The flow of the exhaust gas introduced into the muffler 20 passes through the perforation hole 51a of the inlet pipe 51 during the high speed driving, and then through the perforation hole 53a of the intermediate pipe 53, the exhaust pipe 52. The exhaust gas is introduced into the perforated hole 52a of the exhaust pipe 52a, and the exhaust gas discharged from the discharge end 51b of the inlet pipe 51 passes through the intermediate pipe 53 during the low-speed driving of the inlet 52c of the discharge pipe 52. Muffler of the vehicle, characterized in that it is guided and exhausted.