KR20060031575A - The muffler able to decrease in exhaust noise using porous metal - Google Patents

Abstract

Disclosed is a muffler capable of reducing exhaust noise by using a porous metal having a surface area characteristic per unit volume of the muffler inside the muffler as a sound absorbing material and using a porous metal which can simultaneously provide exhaust noise blocking and output improvement. Muffler according to the present invention is formed on one side of the suction pipe is flanged and the exhaust pipe is connected to the engine, the other side is formed with a discharge pipe for discharging the exhaust gas; Connected between the suction pipe and the discharge pipe, the first vortex generating unit, the first sound absorbing unit, the second vortex generating unit, the second sound absorbing unit, and the third vortex generating unit sequentially from the suction pipe to block the noise of the exhaust gas and the harmful gas. The first sound absorbing part, the second sound absorbing part, and the discharge pipe include a porous metal having a porous structure having interconnected pore structures in an isotropic three-dimensional network structure shape having excellent sound absorption performance with maximized surface area characteristics. do.

Description

Muffler able to reduce in exhaust noise using porous metal

1 is a perspective view showing a muffler according to the present invention,

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

3 is a cross-sectional view showing another embodiment of the sound pipe,

4 is a cross-sectional perspective view showing in detail the vortex generating unit;

5 is a photograph taken with a microscope of the porous metal used as a sound absorbing material in the present invention.

<Description of the code | symbol about the principal part of drawing>

100: muffler 111: case

112: suction pipe 113: discharge pipe

114 exhaust pipe 115 flange

116: tail pipe 200: sound pipe

201: inlet vortex generator 210: first vortex generator

220: first sound absorbing portion 230: second vortex generating portion

240: second sound absorbing portion 250: third vortex generating portion

260: third sound absorbing portion 202, 212, 232, 252: projection                 

270: sound absorbing material

The present invention relates to a two-wheeled four-wheeled vehicle muffler, and more particularly, by using a porous metal having a maximized surface area characteristic per unit volume as a sound absorbing material in an exhaust gas passage in the muffler, it is possible to simultaneously provide exhaust noise and output improvement. The present invention relates to a muffler that can reduce exhaust noise by using a porous metal.

Generally, exhaust gas emitted from engine of automobile is high temperature of about 500 ~ 800 ℃ and contains some lead oxide, carbon particles and fine dust in addition to toxic gases such as carbon monoxide (CO), hydrocarbon (HC), nitrogen oxide (NOx). They are hazardous substances that pollute the atmosphere air. When the exhaust gas is discharged into the atmosphere, the sound of explosion is generated due to the rapid expansion of the gas, and also includes the risk of fire, so that the suction material is built into the muffler main body which is welded with a steel plate and formed into a substantially cylindrical shape to prevent this. By blocking the flow of exhaust gas, the explosion sound of the combustion gas is reduced and discharged, and the direction of sound waves is bent or reflected to reduce noise.

In more detail, the high-temperature / high-pressure exhaust from the engine passes through the catalytic converter, the pipe, and the primary / secondary silencer in the exhaust manifold. And noise / vibration is attenuated and discharged into the atmosphere through the silencer discharge pipe. At this time, existing sound absorbing materials and a method of attenuating exhaust noise are mainly filled with glass wool or metal yarn inside the silencer, In addition, a large number of bulkheads, through-holes, and a plurality of pipes are provided inside the silencer to attenuate the exhaust noise and pressure to obtain sound absorption effect of the exhaust noise.

However, in the case of glass wool and metal yarn used as a sound absorbing material, there is a problem that the exhaust gas back pressure is generated by being united by one side of the exhaust gas, and it is difficult to fill glass wool and metal yarn in the silencer. There was a problem of processing and smooth exhaust emission. In addition, as the wet and dry phenomenon caused by the condensate generated in the silencer is repeated, fine glass fibers are scattered with the exhaust gas to the atmosphere, which may cause serious human health problems related to carcinogens.

On the other hand, many partitions and pipes, which are provided in the existing muffler silencer, can achieve a quieter noise effect in the low noise area of the exhaust noise, while the muffler silencer according to the limitation of sound absorption performance improvement and the complicated silencer structure Increasing its own weight and output power due to the increase in exhaust gas back pressure, increase in manufacturing cost due to the increase of the processing area, such as welding / cutting / bending / bending, and more exposed to corrosion problems of the exhaust gas.

The present invention has been made to solve the conventional problems as described above, the present invention is a sound-absorbing material that is environmentally friendly inside the silencer and porous metal having a maximized surface area characteristics per unit volume by interconnected pore tissue of the three-dimensional network structure shape It provides a muffler that can reduce exhaust noise by using porous metal which can reduce noise by using a low noise and reduce weight by simplifying the structure, improve manufacturing cost, improve vehicle fuel efficiency and output. There is a purpose.

In order to achieve the above object, the present invention,

A case in which a suction pipe is flanged to the exhaust pipe connected to the engine and coupled to the engine at one side thereof, and a discharge pipe at which the exhaust gas is discharged to the other side thereof; And

Connected between the suction pipe and the discharge pipe, the first vortex generating unit, the first sound absorbing unit, the second vortex generating unit, the second sound absorbing unit, and the third vortex generating unit sequentially from the suction pipe to block the noise of the exhaust gas and the harmful gas. The first sound absorbing part, the second sound absorbing part, and the discharge pipe include a porous metal having a porous structure having interconnected pore structures in an isotropic three-dimensional network structure shape having excellent sound absorption performance with maximized surface area characteristics. Provided is a muffler that can reduce exhaust noise by using a porous metal.

Here, the sound pipe is formed in the inlet vortex generating part from the suction pipe to the discharge pipe side, and then partially extended and bifurcated, and the first vortex generating part, the first sound absorbing part, and the second vortex in the same order on the branched upper part and the lower part. The generator, the second sound absorbing portion and the third vortex generating portion is connected to the discharge pipe, the first sound absorbing portion and the second sound absorbing portion may be filled with a sound absorbing material made of a porous metal.                     

At this time, the vortex generator has a structure in which the protrusions protruding inward from the inside of the noise tube extend in a spiral shape.

A plurality of holes communicating with the inside of the case may be punctured on the outer circumferential surface of the sound absorbing unit, and a sound absorbing material made of a porous metal may be filled in the case.

In addition, one side is formed with an intake pipe coupled to the exhaust pipe connected to the engine and the other side is connected to each other in the isotropic three-dimensional network structure shape having excellent sound absorption performance with the maximum surface area characteristics inside the case formed with a discharge pipe through which exhaust gas is discharged A porous metal having a pore structure is filled with a sound absorbing material to provide a muffler that can reduce exhaust noise by using a porous metal that can block the noise and harmful gases of the exhaust gas.

Hereinafter, a muffler capable of reducing exhaust noise using a porous metal according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing a muffler according to the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, Figure 3 is a cross-sectional view showing another embodiment of the sound pipe, Figure 4 is a vortex generating unit in detail It is a sectional perspective view shown, and FIG. 5 is the microscope photograph of the porous metal used as a sound absorption material in this invention.

Referring to FIG. 1, the muffler 100 according to the present invention includes a case 111 and a sound pipe 200. The case 111 is a cylinder having a substantially round shape, and the sound pipe 200 horizontally penetrates the inside thereof. One side of the case 111 is formed with a suction pipe 112 through which the exhaust gas flows from the exhaust pipe 114 of the engine, and a discharge pipe 113 through which the gas passing through the inside of the case 111 is formed. do. That is, the exhaust gas generated from the engine is introduced through the intake pipe 112 from the exhaust pipe 114, reduces the noise while passing through the sound pipe 200, and decomposes various harmful gases to the discharge pipe 113. At this time, the suction pipe 112 and the exhaust pipe 114 are integrally formed with the flange 115 which is coupled to each other is fastened with a bolt or the like. And the tail pipe 116 is coupled to the discharge pipe 113 by a simple bolt coupling. Next will be described in detail with respect to the noise pipe (200) for reducing the noise and thus decomposing various harmful gases.

The sound pipe 200 may be configured in two ways as shown in FIGS. 2 and 3. That is, the first method is connected in a horizontal unitary structure from the suction pipe 112 to the discharge pipe 113, and the second method has a structure extending partially from the suction pipe 112 to the discharge pipe 113 side and bifurcated. Therefore, in the second method, a plurality of discharge pipes 113 are formed, and a plurality of tail pipes 116 coupled to the discharge pipe 113 are also provided.

First, the structure of the noise tube 200 according to the first method is the first vortex generating unit 210, the first sound absorbing unit 220, sequentially from the suction pipe 112 to the discharge pipe 113 as shown in FIG. The second vortex generator 230, the second sound absorbing unit 240, and the third vortex generator 250 are formed.

And the structure of the sound pipe 200 according to the second method, as shown in Figure 3, first from the suction pipe 112, while the inlet vortex generator 201 is formed in the bifurcated branched branch and the first vortex generating unit 210, the first sound absorbing unit 220, the second vortex generating unit 230, the second sound absorbing unit 240, and the third vortex generating unit 250, and the branched lower portion is formed in the same manner as the upper portion. The first vortex generator 210, the first sound absorbing unit 220, the second vortex generating unit 230, the second sound absorbing unit 240, and the third vortex generating unit 250 are included.

Here, the inlet vortex generator 201, the first vortex generator 210, the second vortex generator 230 and the third vortex generator 250 are all the same shape and have the same performance. Looking in detail at the vortex generator 201, 210, 230, 250, as shown in Figure 4 has a plurality of protrusions (202, 212, 232, 252) extending in a spiral in the interior of the sound pipe (200). The exhaust gas is discharged between the protrusions 202, 212, 232, and 252 to form a vortex.

Next, the first sound absorbing unit 220, the second sound absorbing unit 240 and the third sound absorbing unit 260 similarly have the same shape and the same performance. Looking in detail at the sound absorbing parts 220, 240, 260, the sound absorbing material 270 for sucking the exhaust gas is filled in the sound absorbing parts (220, 240, 260). In this case, as the sound absorbing material 270, a porous metal developed and produced by Hittite Co., Ltd., Cheongwon-gun, Chungbuk, which is operated by the applicant, is used. Here, the porous metal is a pore structure of the three-dimensional network structure connected to each other as shown in Figure 5 has a maximum surface area characteristics per unit volume. More specifically, the porous metal may be used differently depending on the noise characteristics, but basically 5 ppi to 100 ppi (ppi: Pore Per Inch) is provided, which has a pore size of 6.0 mm to 0.25 mm and a surface area. Is provided in the form of 500m2 / m3 ~ 15,000m2 / m3. In the preferred embodiment of the present invention, the porous metal is filled and used only in the sound absorbing parts 220, 240, and 260, but the case 111 is formed by drilling a plurality of small holes in the outer circumferential surface of the sound absorbing parts 220, 240, and 260. In order to communicate with the inside of the case 111 may be used to fill the porous metal of the sound absorbing material 270 inside the case 111.

On the other hand, the sound absorbing material 270 is filled in the discharge pipe 113 to finally block the noise and harmful components of the exhaust gas.

Although not shown in the preferred embodiment of the present invention, the muffler 100 may be used by filling the sound absorbing material 270 made of a porous metal inside the case 111 in which the suction pipe 112 and the discharge pipe 113 are formed. The porous metal used as the sound absorbing material 270 blocks the excellent sound absorbing power and harmful gases, so that the sound absorbing material 270 can be used alone.

Next, let's look at the process of inhaling and decomposing the exhaust gas from the sound pipe (200). First, referring to FIG. 2, the exhaust gas introduced into the suction pipe 112 is formed as a vortex in the first vortex generating unit 210 and flows into the first sound absorbing unit 220. Exhaust gas introduced into the first sound absorbing part 220 is reduced by the noise of some of the harmful gas is attached to the surface of the porous metal due to a strong vortex collision and exit. Subsequently, the same action is performed in the second vortex generator 230, the second sound absorber 240, and the third vortex generator 250, and the third sound absorber 260 while reducing noise and blocking harmful gases. Discharged to 113.

3, the exhaust gas introduced into the suction pipe 112 is formed as a vortex in the inlet vortex generator 201, branched bifurcated, and again in the first vortex generator 210 of the upper and lower parts. Is formed to flow into the first sound absorbing unit 220. Exhaust gas introduced into the first sound absorbing part 220 is reduced by the noise of some of the harmful gas is attached to the surface of the porous metal due to a strong vortex collision and exit. Subsequently, the same action is performed in the second vortex generator 230, the second sound absorber 240, and the third vortex generator 250, and the third sound absorber 260 while reducing noise and blocking harmful gases. Discharged to 113.

At this time, the exhaust gas discharged from the engine has a considerable heat at about 500 ~ 800 ℃, the condensate generated while hitting the sound absorbing material 270 in the sound absorbing unit 220, 240, 260 is absorbed by the sound absorbing material 270 by the vortex phenomenon The neutralization reaction is diluted with the harmful gas that is attached impurities and neutralized with nitrogen (N ₂ ), carbon dioxide (CO ₂ ), which are harmless to the human body, and discharged to the outside through the discharge pipe 113. In addition, water (H ₂ O) and noxious gases (HC, NOx, CO) neutralize the gas dust adhering to the surface of the porous metal due to the vortex, and thus harmless nitrogen (N ₂ ) and carbon dioxide (CO _2). ), It reacts with water (H ₂ O) and is discharged to the outside. It always purifies the harmful gas attached to the surface of the porous metal with fresh condensate.

As described above, the present invention provides a sound absorbing material in a sound pipe provided inside the muffler case of porous metals of interconnected pore structures of an isotropic three-dimensional network structure having excellent sound absorption performance with maximized surface area characteristics. By improving the sound absorption performance of the muffler, simplifying and reducing the structure of the muffler, it is possible to reduce manufacturing / processing costs, improve output, and improve fuel efficiency.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

Claims (6)

A case in which a suction pipe is flanged to the exhaust pipe connected to the engine and coupled to the engine at one side thereof, and a discharge pipe at which the exhaust gas is discharged to the other side thereof; And The first vortex generating unit, the first sound absorbing unit, the second vortex generating unit, the second sound absorbing unit, and the third is sequentially connected from the suction pipe so as to be connected between the suction pipe and the discharge pipe to block noise and harmful gas of the exhaust gas. It includes a sound pipe made of a vortex generating unit, the first sound absorbing portion and the second sound absorbing portion and the discharge pipe has an interconnected pore structure of an isotropic three-dimensional network structure shape having excellent sound absorption performance with maximized surface area characteristics A muffler capable of reducing exhaust noise by using a porous metal, wherein the porous metal is filled with a sound absorbing material. According to claim 1, wherein the sound pipe is formed after the inlet vortex generating portion from the suction pipe to the discharge pipe side is partially extended and bifurcated, the branched upper and lower parts in the same sequential first vortex generating unit, the first A sound absorbing part, a second vortex generating part, a second sound absorbing part and a third vortex generating part are connected to the discharge pipe, and the first sound absorbing part and the second sound absorbing part are characterized in that the sound absorbing material made of a porous metal is filled. Muffler that can reduce exhaust noise by using porous metal. The method of claim 1 or claim 2, wherein the vortex generator is to reduce the exhaust noise by using a porous metal, characterized in that the protrusion projecting inward from the inside of the sound pipe extends in a spiral form from one side to the other side. Muffler that can. The porous metal of claim 1 or 2, wherein a plurality of holes communicating with the inside of the case are drilled on the outer circumferential surface of the sound absorbing unit, and the sound absorbing material made of a porous metal is filled in the case. Muffler that can reduce exhaust noise by using. On one side, the inlet pipe is connected to the exhaust pipe connected to the engine, and the inlet pipe is formed on the other side. Muffler that can reduce the exhaust noise by using a porous metal, characterized in that the porous metal having a porous material is filled with a sound absorbing material can block the noise and harmful gases of the exhaust gas. The method of claim 1 or 5, wherein the porous metal has a pore size (Pore Size) of 6.0mm ~ 0.25mm size, the surface area ratio per unit volume is characterized in that it is provided in the form of 500m2 / m3 ~ 15,000m2 / m3. Muffler that can reduce exhaust noise by using porous metal.

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