KR19980061281A - Muffler with sound absorption material - Google Patents

Abstract

The present invention relates to a muffler incorporating a sound absorbing material, which aims to contribute to the improvement of engine output by reducing the back pressure while reducing the airflow of exhaust gas discharged at high speed of operation of the engine with the sound absorbing material.

In order to achieve the above object, the present invention provides a suction pipe (2) and discharge pipe (2 ') in which a housing (1) having a predetermined capacity is communicated with each other in front and rear, and the interior of the housing (1). A plurality of partitions 3,3a and 3b installed in the wall to divide the inner space, and a plurality of tubes 4 and 4 'fixed vertically through the partitions 3,3a and 3b in the longitudinal direction. In the vehicle muffler, the housing (1) is provided with a sound absorbing material (5) for reducing the air flow generated during high-speed operation of the engine, and a branch pipe (6) for inducing exhaust gas to the sound absorbing material (5). It is characterized by.

Description

Muffler with sound absorption material

The present invention relates to a muffler equipped with a sound absorbing material to reduce exhaust noise, and in particular, a muffler containing a sound absorbing material capable of reducing high speed airflow through the sound absorbing material while improving the output by reducing the back pressure during high-speed operation of the engine. It is about.

In general, a muffler (also called a resonator) of a vehicle is mounted on an exhaust line to reduce exhaust noise. The muffler uses Helmholtz's resonance principle in a hollow quadrangular box or cylindrical shape. It is to reduce the exhaust noise level, that is, to reduce the noise level in a specific frequency band according to the volume size in the muffler.

1 is a cross-sectional view of a conventional conventional muffler as described above, that is, the housing 11 having a predetermined capacity, generally having a quadrangular box or a cylindrical cross section, respectively, the suction pipe 12 and the discharge pipes in front and rear, respectively. The pipe 12 ′ is mounted in communication, and a plurality of partitions 13 are provided inside the housing 11 to divide the internal space, and a plurality of tubes 14 are provided in the partitions 13. It has a structure provided so as to penetrate (13) in the longitudinal direction and being fixed.

Accordingly, the muffler is configured to attenuate the exhaust noise by lowering the temperature and pressure of the exhaust gas discharged during operation of the engine, that is, the exhaust gas discharged when the engine is running is transferred to the muffler through the front suction pipe 12. Passing into the housing 11 and passing through the plurality of tubes 14 installed between the plurality of partitions 13, the pressure and the temperature are reduced to discharge into the atmosphere through the discharge pipe 12 ′.

However, in the conventional muffler as described above, the exhaust noise of the low frequency region of the exhaust gas discharged at the low speed of the engine can be reduced, but the airflow noise (the exhaust noise of the high frequency region due to the high back pressure at the high speed of the engine operation) Noise generated when the speed is 50 kHz or more) has a disadvantage in that it is not effectively reduced.

Accordingly, the present invention has been made to solve the above disadvantages, while reducing the airflow of the exhaust gas discharged during high-speed operation of the engine to the sound absorbing material while lowering the back pressure to contribute to the improvement of the engine output muffler built-in muffler The purpose is to provide.

1 is a cross-sectional view showing a conventional general muffler,

2 is a cross-sectional view showing a muffler incorporating a sound absorbing material according to the present invention;

3 is a diagram illustrating main parts of FIG. 2.

* Description of the symbols for the main parts of the drawings *

1: Housing 2: Suction pipe

2 ': exhaust pipe 3: bulkhead

3a: first partition 3b: second partition

4,4 ': Tube 5: Sound absorbing material

6: branch office 7: chamber

8: Spring 9: Valve

10: Hole

The present invention for achieving the above object is, the suction pipe and the discharge pipe is mounted in communication with each other in the front and rear, each having a predetermined capacity, a plurality of partitions installed inside the housing to divide the internal space and A muffler of a vehicle comprising a plurality of tubes fixed vertically through the partition wall in a longitudinal direction, wherein the housing includes a sound absorbing material for reducing airflow generated during high-speed operation of the engine, and inducing exhaust gas to the sound absorbing material. It is configured to have a branch pipe.

To this end, the sound absorbing material is filled in the chamber formed by the first partition and the second partition in the housing while the branch pipe is installed to communicate with the chamber formed by the first partition and the second partition, while the spring inside the branch pipe The valve is installed to open elastically via.

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

2 is a cross-sectional view showing a muffler incorporating a sound absorbing material according to the present invention, and FIG. 3 is a main part diagram of FIG. 2.

As shown in the figure, the muffler incorporating the sound absorbing material according to the present invention has a housing 1 having a predetermined volume and having a predetermined capacity in communication with the suction pipe 2 and the discharge pipe 2 'in front and rear, respectively. In addition, a plurality of partitions 3, 3a and 3b are provided inside the housing 1 to divide the internal space, and a plurality of tubes 4 and 4 'are provided in the partitions 3, 3a and 3b. In the muffler of the vehicle which is fixed to penetrate the three partitions (3, 3a, 3b) in the longitudinal direction, respectively, the sound absorbing material (5) in the housing (1) to reduce the air flow generated during high-speed operation of the engine And the branch pipe 6 which guides the exhaust gas to the sound absorbing material 5.

The sound absorbing material 5 is made of, for example, glass fibers to be filled in the chamber 7 formed by the first partition 3a and the second partition 3b in the housing 1, and the suction pipe 2 A branch pipe 6 communicating with the chamber 7 formed by the first partition 3a and the second partition 3b is installed, and the branch pipe 6 is elastically connected via a spring 8 inside the branch pipe 6. An open valve 9 is provided.

In addition, a plurality of holes 10 having a fine shape having a diameter of about 3 mm are drilled in the front end surfaces of the first partition 3a and the branch pipe 6, respectively, so that the holes 10 operate at high speed. The exhaust gas introduced through the suction pipe 2 is introduced into the chamber 7 formed by the first partition 3a and the second partition 3b through the branch pipe 6 to absorb the sound absorbing material 5. As a result, the back pressure is reduced while the airflow of the exhaust gas is reduced.

Therefore, the exhaust gas discharged at low speed of operation of the engine is introduced into the housing 1 through the suction pipe 2 of the muffler, where the valve 9 of the branch pipe 6 is closed by the elastic force of the spring 8. Since it is kept in the state, the exhaust gas expands and passes through the tubes 4 'and 4 provided in the partition wall 3 sequentially while being attenuated by the exhaust noise in the low frequency region, and then into the atmosphere through the exhaust pipe 2'. Will be discharged.

On the other hand, the exhaust gas discharged at the high speed of the engine is also introduced into the housing 1 through the suction pipe 2 of the muffler, wherein the high pressure exhaust gas introduced therein is a valve 9 installed in the branch pipe 6. The valve 8 is opened upwards to overcome the tension of the spring 8 and flow into the chamber 7 formed by the first partition 3a and the second partition 3b, and flow into the chamber 7. The exhaust gas is discharged to the outside while the air absorbing sound of the high frequency region is reduced by the sound absorbing material 5 filled in the chamber 7.

At this time, the high-pressure exhaust gas introduced into the housing 1 through the suction pipe 2 passes through a plurality of perforated holes 10 in the branch pipe 6 and the first partition 3a, respectively, so as to reduce the back pressure. The output of the engine is thus improved.

As described above, by the muffler incorporating the sound absorbing material according to the present invention, the high-pressure exhaust gas discharged therefrom during the high speed operation of the engine is introduced into the chamber 7 incorporating the sound absorbing material 5, which is exhaust noise in the high frequency region. In addition to reducing the sound, the back pressure is reduced while passing through a plurality of holes 10 drilled in a minute shape on the front end surfaces of the first partition 3a and the branch pipe 6, thereby improving the output of the engine. Will get

Claims (3)

A suction pipe 2 and a discharge pipe 2 'each having a predetermined capacity in communication with each other in front and rear, and a plurality of partition walls installed inside the housing 1 to divide the internal space ( In the muffler of a vehicle comprising 3, 3a, 3b and a plurality of tubes 4, 4 'fixed vertically through the partitions 3, 3a, 3b in the longitudinal direction, The housing 1 has a sound absorbing material comprising a sound absorbing material 5 for reducing airflow noise generated during high-speed operation of the engine, and a branch pipe 6 for inducing exhaust gas to the sound absorbing material 5. One muffler. 2. The sound absorbing material (5) according to claim 1, wherein the sound absorbing material (5) is filled in a chamber (7) formed by the first partition (3a) and the second partition (3b) in the housing (1). It is installed to communicate in the chamber 7 formed by the 3d and the 2nd partition 3b, while the valve 9 which is elastically opened via the spring 8 is provided in the inside of this branch pipe 6. Muffler with a sound absorbing material characterized in that. The sound absorbing material according to claim 1, wherein a plurality of holes 10 having fine shapes are drilled in the front end surfaces of the first partition 3a and the branch pipe 6, respectively, to reduce the back pressure of the exhaust gas. The built-in muffler.