KR20210061536A - Muffler device - Google Patents

Abstract

Disclosed is a muffler device, which comprises: a muffler unit having an inlet pipe where exhaust gas is introduced, a chamber connected to a rear end of the inlet pipe, and an outlet pipe connected to a rear end of the chamber and discharging the exhaust gas; and a sound wave supply unit supplying a wound wave into the chamber to condense fine dust contained in the exhaust gas to increase a size of the fine dust.

Description

Muffler device

The present invention relates to a muffler device.

In general, a vehicle consists of various driving devices such as an engine, a suspension system, a body frame, and a steering system. In particular, an engine is a power for driving a vehicle through suction, compression, expansion (explosion), and exhaust stroke of the supplied fuel. Is obtained.

Here, in the process of performing the expansion stroke of the engine, a certain amount of exhaust gas is generated, and the generated exhaust gas is discharged by the exhaust stroke. As a device for discharging such exhaust gas to the outside, a catalytic converter and a muffler are used.

In the process in which the exhaust gas generated from the engine is discharged to the outside as described above, carbon monoxide, hydrocarbons, nitrogen oxides, etc. are reduced by the catalyst by the catalytic converter, and are introduced into the muffler in a reduced state.

A conventional vehicle muffler structure will be described with reference to the accompanying drawings. 1 is a perspective view showing the overall configuration of a conventional vehicle muffler.

As shown in FIG. 1, in the conventional vehicle muffler structure, a catalytic converter 4, a sub muffler 6, and a main muffler 8 are connected to the exhaust manifold 2 of the engine 1. It has a configuration installed to communicate.

Accordingly, after the exhaust gas generated from the engine 1 is collected in the exhaust manifold 2, it is discharged to the outside through the catalytic converter 4, the sub muffler 6 and the main muffler 8 through the connecting pipe. In the process of passing through the catalytic converter 4, carbon monoxide, hydrocarbons, and nitrogen oxides of the exhaust gas are reduced by the catalyst, and exhaust noise through sound absorption and resonance in the process of passing through the sub muffler 6 and the main muffler 8 Will decrease.

The above muffler is an inflatable type that diffuses the sound from a thin tube into a wide space to reduce the sound, and a resonance type that cancels the sound from each other by diffusing the sound from many holes of the thin tube into a wide resonance chamber, and steel wool. Absorption type, which absorbs metal in the form of a thread, and partition type, which combines the previous three methods, are used.

Meanwhile, a configuration of a conventional muffler will be described with reference to FIG. 2. 2 is an internal configuration diagram schematically showing the configuration of a muffler according to the prior art.

As shown in Fig. 2, the muffler according to the prior art includes a muffler body 12 partitioned by a partition plate 11 to form a plurality of partition chambers 12a, 12b, 12c; An intake pipe 13 having one end connected to the exhaust pipe of the exhaust system and the other end communicating with the central partition chamber 12b between the downstream and upstream side chambers; An exhaust pipe 14 having one end communicating with the upstream side partition chamber 12c and the other end extending to the outside of the muffler body 12; And one or more communication pipes 15 for guiding the exhaust gas provided from the intake pipe 13 to be circulated in the partition chamber in the muffler body 12 and finally discharged through the exhaust pipe 14.

In the conventional muffler configured as described above, the exhaust gas entering through the intake pipe 13 is circulated in each compartment through the communication pipe 15 as indicated by the arrow, and noise is reduced through sound absorption and resonance, and then finally It is discharged to the outside through the exhaust pipe (14).

However, since the muffler according to the prior art has a structure in which only noise regulation of exhaust gas is considered, it is not possible to adequately respond to new environmental regulations because it cannot reduce fine dust, nitrogen oxides, etc., which are exhaust gas regulating substances.

In addition, there is a problem in that a highly efficient filtration filter (eg, Hepa Filter) must be installed in order to filter ultrafine dust (PM2.5, Particulate Matter Less than 2.5㎛) in the exhaust gas.

An object of the present invention is to provide a muffler device capable of reducing noise and reducing ultrafine dust by aggregating ultrafine dust in exhaust gas.

Further, it is an object of the present invention to provide a muffler device capable of applying a low-grade filtration filter by not using a filtration filter or reducing ultrafine dust.

On the other hand, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly to those of ordinary skill in the technical field to which the present invention belongs from the following description. It will be understandable.

The muffler device according to an embodiment of the present invention includes an inlet pipe through which exhaust gas is introduced; A chamber in communication with the rear end of the inlet pipe; A discharge pipe communicating with the rear end of the chamber and through which the exhaust gas is discharged; And a sound wave supply unit supplying sound waves into the chamber to agglomerate fine dust contained in the exhaust gas to increase the size of the fine dust. It may include.

The sound wave supply unit transfers the sound wave amplified by the amplifying unit and a sound source acquisition unit that amplifies the sound source acquired from the sound source acquisition unit into the chamber. It may include a sound wave transmission unit.

The muffler unit may include a tab member bent such that a rear surface thereof forms a predetermined angle, and is disposed in the chamber to increase transmission loss of exhaust gas; It may further include.

The chamber includes a first compartment chamber, a second compartment chamber, and a third compartment chamber partitioned by a partition plate, and the first compartment chamber communicates with an exhaust hole of the inlet pipe, and the second compartment chamber comprises the The rear end of the inlet pipe and the front end of the discharge pipe are communicated, and the third compartment chamber may communicate with the exhaust hole of the discharge pipe.

The tab member may be disposed in the third compartment, and may transmit sound waves from the transfer unit to a tip region of the tab member.

The inlet pipe, the chamber, and the discharge pipe are disposed in a first direction, and a central axis of the inlet pipe and a central axis of the discharge pipe may be mutually eccentric in a second direction perpendicular to the first direction.

In the second direction, the central axis of the chamber, the central axis of the inlet pipe, and the central axis of the discharge pipe may be located on the same plane.

The central axis of the chamber and the central axis of the inlet pipe may be located on the same line.

In the second direction, the center of one end of the tab member may be located on the same line as the central axis of the discharge pipe.

The discharge pipe may have an inner diameter extending from the front end to the rear end.

According to an embodiment of the present invention, the present invention reduces noise, and it is possible to reduce the ultrafine dust by agglomerating the ultrafine dust in the exhaust gas.

In addition, in the present invention, it is possible to apply a low-grade filtration filter by not using a filtration filter or by reducing ultrafine dust.

On the other hand, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. I will be able to.

1 is a perspective view schematically showing the overall configuration of a conventional vehicle exhaust system,
2 is an internal configuration diagram schematically showing the configuration of a muffler according to the prior art,
3 is an exemplary view schematically showing the overall configuration of an exhaust system for a vehicle according to an embodiment of the present invention,
4 is an exemplary view schematically showing the configuration of a muffler device according to an embodiment of the present invention,
5 is an enlarged view of 20 in FIG. 4,
6 is a graph showing the ultrafine dust reduction rate in each zone (S1 to S4) in the vehicle exhaust system according to an embodiment of the present invention,
7 is a perspective view showing a muffler part in the muffler device according to an embodiment of the present invention,
8 is an internal perspective view showing a state cut along line A-A' of FIG. 7;
9 is a top view of FIG. 7,
10 is a front view of FIG. 7,
11 is a side view of FIG. 7,
12 is an image (STAR CCM+) showing the result of analyzing the flow in the muffler part in the muffler device according to an embodiment of the present invention,
13 is a graph comparing transmission loss between a muffler device according to an embodiment of the present invention and a muffler device of a comparative example (conventional).

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more completely describe the present invention to those with average knowledge in the art. Therefore, the shape of the element in the drawings is exaggerated to emphasize a more clear description.

The configuration of the present invention for clarifying the solution to the problem to be solved by the present invention will be described in detail with reference to the accompanying drawings based on a preferred embodiment of the present invention, but the same in assigning reference numerals to the components of the drawings. For the components, even if they are on different drawings, the same reference numerals are given, and it should be noted in advance that components of other drawings can be cited if necessary when describing the drawings.

3 is an exemplary view schematically showing the overall configuration of an exhaust system for a vehicle according to an embodiment of the present invention, and FIG. 4 is an exemplary view schematically showing the configuration of a muffler device according to an embodiment of the present invention, and FIG. 5 Is an enlarged view of 20 of FIG. 4, and FIG. 6 is a graph showing the reduction rate of ultrafine dust in each zone S1 to S4 in the vehicle exhaust system according to an embodiment of the present invention.

Meanwhile, hereinafter, an embodiment of the present invention is described as being applied to the vehicle exhaust system 1000, but can be applied to an exhaust system such as a thermal power plant or factory that discharges exhaust gas including ultrafine dust. The invention is not limited to vehicle exhaust systems.

First, referring to FIGS. 3 to 6, the exhaust system 1000 for a vehicle according to an embodiment of the present invention includes an engine 1, a catalytic converter 10, a muffler unit 100, and a sound wave supply unit 200. can do.

The engine 1 may be a general vehicle engine, and may be a gasoline direct injection (GDI) engine in which a large number of particulate materials are generated.

The catalytic converter 10 is connected to an exhaust manifold of the engine 1 through a connection pipe, and can primarily reduce harmful components such as fine dust and nitrogen oxides, which are emission control substances contained in exhaust gas. .

Here, referring to FIG. 6, in the section S2 of the catalytic converter 10, harmful components can be reduced by about 50% compared to the section S1 of the connecting pipe (engine exhaust manifold) at the front end.

The muffler unit 100 includes an inlet pipe 110, a chamber 120, an outlet pipe 130, and a tab member 140, and in the process of discharging the exhaust gas introduced through this configuration, the exhaust gas circulation path is By providing it can reduce its pressure and noise.

The inlet pipe 110 communicates with the catalytic converter 10 and the chamber 120, and exhaust gas introduced through the inlet pipe 110 may be introduced into the chamber 120.

The chamber 120 may have a plurality of partition chambers partitioned by one or more partition plates so that the introduced exhaust gas can circulate.

The discharge pipe 130 is disposed at the rear end of the chamber 120 to allow exhaust gas to flow out of the chamber 120.

The tab member 140 is disposed in the chamber 120 and changes the path of the exhaust gas circulating in the chamber 120 to increase the transmission loss of the exhaust gas from the muffler unit 100.

Here, flow analysis and transmission loss of the muffler unit 100 will be described in more detail below.

The sound wave supply unit 200 may obtain a sound source from the inlet pipe 110, amplify the sound source, and then supply sound waves of a set level into the chamber 120 of the muffler unit 100.

Here, the sound wave supplied to the chamber 120 aggregates the ultrafine dust (eg, PM2.5) in the exhaust gas circulating in the chamber 120 to increase the size of the fine dust (eg, PM10). I can.

That is, referring to FIGS. 4 and 5 together, the sound wave supply unit 200 vibrates and collides a plurality of ultrafine dust P1 separated from each other by supplying sound waves of a set level in the chamber 120. It can be converted into fine dust (P2) whose size is expanded by agglomeration with ultrafine dust (P1) particles.

The sound wave supply unit 200 may include a sound source acquisition unit 210 and a sound wave supply unit 220.

The sound wave supply unit 220 may include an amplification unit 221 and a sound wave transmission unit 232.

The voice source obtaining unit 210 may be connected to the inlet pipe 110 and may obtain a voice source generated from the inlet pipe 110. Of course, although not shown, the voice source acquisition unit 210 may be connected to at least one of the engine 1, the catalytic converter 10, or a connection pipe therebetween to obtain a voice source.

The voice source acquisition unit 210 may be implemented as a device such as a microphone, and may acquire a voice source in a connected area.

Here, the voice source may include all frequencies of an audible sound wave or an ultrasonic sound band.

The voice source acquisition unit 210 may acquire a voice source and convert it into an electrical voice signal.

The amplifying unit 221 may amplify the voice signal transmitted from the voice source obtaining unit 210 and output a voice signal having a set sound pressure level.

Meanwhile, it is preferable that the amplifying unit 221 amplifies the voice in a range of 140dB to 150dB.

Here, if the amplification unit 221 amplifies the voice signal to less than 140dB, there is a problem that it is difficult to effectively aggregate the ultrafine dust P1 and expand it to the fine dust P2.

In addition, if the amplification unit 221 amplifies the voice signal by more than 150 dB, it is difficult to expect the aggregation efficiency of the ultrafine dust P1 above the threshold efficiency, and the output sound pressure level becomes larger than necessary, thereby reducing the noise. There is a problem against the main function of 100).

The sound wave transmission unit 222 may be implemented as a device such as a speaker phone, and may transmit sound waves of a sound pressure level amplified by the amplification unit 221 into the chamber 120.

Here, the sound wave transmission unit 222 may include at least a pair of sound wave transmission units 222 facing each other, and the at least one pair of sound wave transmission units 222 transmit sound waves that meet at the center of the mutual chamber 120. I can deliver.

In addition, the sound wave transmission unit 222 may have a sound wave transmission directivity, and optimally transmit "? direction?* sound waves" according to the shape of the chamber 120.

Here, referring to FIG. 6, through this, while passing through the muffler unit 100 to which the sound wave supply unit 220 is connected, in the muffler unit 100 section S4, the harmful components are compared to the inlet pipe section S3 at the front end. Can be reduced by about 60% or more.

As a result, in the section S4 of the muffler unit 100, harmful components can be reduced by about 80% compared to the engine exhaust manifold section S1.

Meanwhile, as described above, since the sound wave supply unit 200 supplies sound waves of 140dB to 150dB into the chamber 120, the muffler unit 100 according to the embodiment of the present invention is a generally used intermediate frequency band (800Hz ~ The transmission loss condition at 1600Hz, preferably 1300Hz to 1600Hz) can be improved to 140dB to 150dB.

Hereinafter, the muffler unit 100 in the muffler device according to an embodiment of the present invention will be described in detail with reference to FIGS. 7 to 11.

7 is a perspective view showing a muffler part in the muffler device according to an embodiment of the present invention, FIG. 8 is an inner perspective view showing a state cut along line A-A' of FIG. 7, and FIG. 9 is a top view of FIG. 7 And FIG. 10 is a front view of FIG. 7, and FIG. 11 is a side view of FIG. 7.

7 to 11, the muffler unit 100 according to an embodiment of the present invention may include an inlet pipe 110, a chamber 120, an outlet pipe 130, and a tab member 140.

The inlet pipe 110 may provide a path through which exhaust gas including ultrafine dust PM2.5 is introduced.

The chamber 120 is disposed in communication with the rear end of the inlet pipe 110, and may include a plurality of partition chambers 121, 122, 123, and 124 partitioned by a plurality of partition plates.

Here, the chamber 120 may have an elliptical shape, and the inlet pipe 110 in a second direction (width direction, Y-axis direction) perpendicular to the first direction (length direction, X-axis direction) forgetting the front and rear ends. The central axis CL1 of) may be located on the same line as the central axis CL1 of the chamber 120.

In addition, the central axis CL1 of the inlet pipe 110 and the chamber 120 and the central axis CL2 of the discharge pipe 130 may be located on the same surface formed along the second direction (width direction, Y-axis direction). have.

The partition chambers 121, 122, 123, 124 may include a first compartment 121, a second compartment 122, a third compartment 123, and a fourth compartment 124.

Here, the inlet pipe 110 includes a plurality of exhaust holes 111 penetrating through the outer circumferential surface and the inner circumferential surface, and the first compartment chamber 121 is in communication with the exhaust hole 111 of the inlet pipe 110 and the exhaust hole ( 111) may provide a path through which exhaust gas is circulated.

The second compartment chamber 122 is disposed at the rear end of the first compartment 121 and communicates with the exhaust hole 111 of the inlet pipe 110 to provide a path through which the inflow exhaust gas is circulated.

The third compartment chamber 123 may provide the widest space in the chamber 120 and may be disposed at the rear end of the second compartment chamber 122.

In addition, the third compartment chamber 123 may communicate with the rear end of the inlet pipe 110 and the front end of the discharge pipe 130 to provide a path through which the introduced exhaust gas is circulated.

Meanwhile, a tab member 140 may be disposed in the third compartment chamber 123, and a sound wave transmission unit 222 may be connected.

The fourth compartment chamber 124 communicates with the exhaust hole 131 of the discharge pipe 130 to provide a path through which exhaust gas introduced through the exhaust hole 131 is circulated and then discharged.

In the fourth compartment chamber 124, the ultrafine dust (PM2.5) particles in the circulating exhaust gas aggregate with each other through the sound waves transmitted from the sound wave transmission unit 222, so that the size can be expanded to the fine dust (PM10). have.

The discharge pipe 130 may include fine dust PM10 formed by agglomeration of the ultrafine dust PM2.5, and may discharge exhaust gas with reduced noise to the outside.

Here, the discharge pipe 130 has an inner diameter that expands from the front end to the rear end, and may be implemented as an inflatable tube that diffuses from a thin tube to a wide space to reduce sound.

Here, the central axis CL2 of the discharge pipe 130 may be positioned to be eccentric with the central axis CL1 of the inlet pipe 110 in the second direction (width direction, Y-axis direction).

Through this, it is possible to increase the circulation path of the exhaust gas in the chamber 120 and increase the transmission loss of the exhaust gas passing through the chamber 120.

The tab member 140 is disposed in the third compartment chamber 123 and may be formed in a V-shaped plate shape bent so that the rear surface located at the rear end has a predetermined angle.

That is, one side and the other side of the rear surface of the tab member 140 face each other in the second direction (width direction, Y-axis direction) and may be inclined with a set inclination.

Here, the predetermined angle can be variously deformed according to the shape of the chamber 120, and it is preferable to form an obtuse angle. Of course, the predetermined angle set according to the shape of the chamber 120 may be a right angle or an acute angle.

Here, the width of the tab member 140 is formed smaller than the inner circumferential diameter of the chamber 120 in the second direction (width direction, Y-axis direction), and the height of the tab member 140 is in the third direction (height direction, Z-axis direction) Direction) may be formed equal to the inner circumferential diameter of the chamber 120.

That is, the upper and lower ends of the tab member 140 may contact the chamber 120 in the height direction.

Meanwhile, the bent line of the tab member 140 is formed along the third direction (height direction, Z-axis direction), and may be located on the same plane as the central axis CL1 of the inlet pipe 110 and the chamber 120. have.

That is, the exhaust gas introduced through the inlet pipe 110 may be branched to one side and the other side in the second direction (width direction, Y-axis direction) by the tab member 140 in the third compartment chamber 123.

In addition, the exhaust gas circulating in the third compartment chamber 123 is branched to one side and the other side in the second direction (width direction, Y-axis direction) by the tab member 140, and then the tab member 140 according to the flow. ), a vortex may be formed at one end and the other end of the tab member 140 and may flow along the rear surface of the tab member 140.

That is, the tab member 140 may increase the circulation path of the exhaust gas in the third compartment chamber 123, and as a result, may increase the transmission loss of the exhaust gas passing through the chamber 120.

Meanwhile, the center of one end of the tab member 140 in the second direction (width direction, Y-axis direction) may be positioned on the same line as the central axis CL2 of the discharge pipe 130.

Through this, the exhaust gas flowing along the front surface of the tab member 140 and the exhaust gas flowing along the vortex at the rear surface of the tab member 140 may be joined at one end of the tab member 140 and circulated.

Meanwhile, the third compartmental chamber 123 may be divided into a front end region 123a and a rear end region 123b based on the bend line of the tab member 140.

The sound wave transmission unit 222 preferably transmits sound waves from the tip region 123a to the third compartment chamber 123, and it is preferable to aggregate the ultrafine dust particles before branching through the tab member 140.

Hereinafter, flow analysis and transmission loss of the muffler device according to an embodiment of the present invention will be described with reference to FIGS. 12 and 13.

12 is an image (STAR CCM+) showing the result of analyzing the flow in the muffler unit in the muffler device according to an embodiment of the present invention, and FIG. 13 is a muffler device according to an embodiment of the present invention and a comparative example ( It is a graph comparing transmission loss in the conventional muffler device

The muffler unit 100 according to an embodiment of the present invention including the inlet pipe 110, the chamber 120, the discharge pipe 130, and the tab member 140 as described above, as shown in FIG. You can check the flow.

In addition, referring to FIG. 13, the muffler of the comparative example (conventional) shown in FIG. 2 has a transmission loss condition in a generally used intermediate frequency band (800 Hz to 1600 Hz, preferably 1300 Hz to 1600 Hz) is approximately 15 dB to 60 dB. On the other hand, the muffler unit 100 according to an embodiment of the present invention may cause a transmission loss of 15dB to 150dB in an intermediate frequency band.

That is, the muffler unit 100 according to an embodiment of the present invention can increase the transmission loss of exhaust gas circulating in the chamber 120 to 140 dB or more in an intermediate frequency band, which is a use frequency, so that the sound wave supply unit 200 By applying, it is possible to prevent a noise problem occurring in the process of coagulating the ultrafine dust P1 in the chamber 120 and expanding it into the fine dust P2.

The detailed description above is illustrative of the present invention. In addition, the above description shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications may be made within the scope of the concept of the invention disclosed in the present specification, the scope equivalent to the disclosed contents, and/or the technology or knowledge in the art. The above-described embodiments are to describe the best state for implementing the technical idea of the present invention, and various changes required in the specific application fields and uses of the present invention are also possible. Therefore, the detailed description of the invention is not intended to limit the invention to the disclosed embodiment. In addition, the appended claims should be construed as including other embodiments.

100: muffler part
110: inlet pipe 120: chamber
130: discharge pipe 140: tab member
200: sound wave supply unit
210: voice source acquisition unit 220: sound wave supply unit

Claims (10)

An inlet pipe through which exhaust gas is introduced;
A chamber in communication with the rear end of the inlet pipe;
A discharge pipe communicating with the rear end of the chamber and through which the exhaust gas is discharged; And
A sound wave supply unit supplying sound waves into the chamber to agglomerate fine dust contained in the exhaust gas to increase the size of the fine dust; A muffler device comprising a.
The method of claim 1,
The sound wave supply unit
A voice source obtaining unit for obtaining the noise generated in the inlet pipe as a voice source,
An amplifying unit for amplifying the voice source obtained by the voice source obtaining unit, and
A muffler device comprising a sound wave transmission unit for transmitting sound waves amplified by the amplification unit into the chamber.
The method of claim 2,
The muffler part,
A tab member bent such that a rear surface thereof forms a predetermined angle, and is disposed in the chamber to increase transmission loss of exhaust gas; A muffler device further comprising a.
The method of claim 3,
The chamber,
Including a first compartment chamber, a second compartment chamber, and a third compartment chamber divided by a partition plate,
The first compartment chamber communicates with the exhaust hole of the inlet pipe,
The second compartment chamber is in communication with the rear end of the inlet pipe and the front end of the discharge pipe,
The third compartment chamber is a muffler device that communicates with the exhaust hole of the discharge pipe.
The method of claim 4,
The tab member is disposed in the third compartment chamber,
A muffler device for transmitting sound waves from the transmission unit to a tip region of the tab member.
The method of claim 4,
The inlet pipe, the chamber and the discharge pipe are arranged in a first direction,
A muffler device in which a central axis of the inlet pipe and a central axis of the discharge pipe are mutually eccentric in a second direction perpendicular to the first direction.
The method of claim 6,
In the second direction
A muffler device in which a central axis of the chamber, a central axis of the inlet pipe, and a central axis of the discharge pipe are located on the same plane.
The method of claim 7,
A muffler device in which a central axis of the chamber and a central axis of the inlet pipe are located on the same line.
The method of claim 8,
In the second direction, the center of one end of the tab member is located on the same line as the central axis of the discharge pipe.
The method of claim 1,
The discharge pipe is a muffler device whose inner diameter is expanded from the front end to the rear end.

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