KR20170138263A - Silencer comprises a perforated embossed type - Google Patents

Abstract

An objective of the present invention is to provide a muffler including embossed holes, which includes one or more noise reduction means formed on a flow passage in a pocket form and arranged side by side, and minimizes discharge of noise introduced by the noise reduction means and embossed holes formed on an inner surface of a muffler through the embossed holes. The muffler including embossed holes comprises: a plurality of pocket-type sound absorption members wherein a front perforated plate with a plurality of embossed holes is arranged on a front opened surface of an inlet side on a flow passage, and the remaining surfaces are blocked to include a sound absorption material therein to be arranged side by side; and an inner surface perforated plate having a plurality of embossed holes to be installed to arrange a sound absorption material between an inner surface of a housing and the flow passage. Accordingly, noise reduction efficiency is maximized, and noise from a fluid discharged through the muffler is minimized to maintain a surrounding environment quietly.

Description

[0001] The present invention relates to a silencer comprising a perforated embossed type,

The present invention relates to a muffler including an embossed hole, and more particularly, to a muffler having an embossed hole formed in the inner surface of the muffler, The present invention relates to a silencer including an embossed punch capable of minimizing the noise emitted from the inlet through the embossed hole and effectively reducing the low frequency noise.

Generally, silencers are classified into four types of sound absorbing type, expansion type, resonance type, and interference type according to a sound attenuation method for reducing noise.

The sound-absorbing silencer is a silencer that absorbs sound to reduce noise by installing a sound-absorbing material such as glass fiber that can absorb sound in a part of the duct, and the expansion type has an expansion part in the duct to expand and shrink sound waves, It is a silencer that reduces the noise.

A resonator type silencer is a silencer which has a neck part in a channel and resonates with the cavity to absorb the energy of the sound wave by the air vibration of the cavity part. The interference type divides the path of the sound wave into two parts, Refers to a silencer that attenuates sound by interfering the difference with a half wavelength of the sound wave.

Prior art relating to a sound-absorbing silencer includes Korean Patent No. 10-0918700 (hereinafter referred to as "Prior Art Document 1"), Korean Patent No. 10-0924958 (hereinafter referred to as "Prior Art Document 2"), (Hereinafter referred to as 'Prior Art Document 3'), Korean Patent No. 10-1030440 (hereinafter referred to as 'Prior Art Document 4'), Korean Patent No. 10-0939702 Prior Art Document 5 ') and Korean Patent Publication No. 10-2013-0104852 (hereinafter referred to as "Prior Art Document 6").

Prior art relating to an expandable silencer is disclosed in Korean Patent No. 10-1016601 (hereinafter referred to as "Prior Art Document 7").

Prior art relating to a resonance type silencer includes a resonance space having a predetermined volume and a perforated plate having a plurality of through holes as disclosed in Korean Patent No. 10-0555375 (hereinafter referred to as "Prior Art Document 8"), A technique has been proposed in which sound waves are dissipated by the resonance action of the sound waves incident on the inside, thereby reducing noise without a sound absorbing material.

The prior art related to the sound absorber using sound absorption and resonance includes a low-mid-range sound control device having a compact structure and influencing the sound performance, as disclosed in Korean Patent No. 10-0632419 (hereinafter referred to as 'Prior Art Document 9' A technique such as a sound absorbing resonator type silencer which exhibits an effective sound absorbing performance in a frequency component and which has strong structural and tensile strength even when exposed to air has been proposed.

Korean Patent No. 10-0918700 Korean Patent No. 10-0924958 Korean Patent Publication No. 10-2010-0134274 Korean Patent No. 10-1030440 Korean Patent No. 10-0939702 Korean Patent Publication No. 10-2013-0104852 Korean Patent No. 10-1016601 Korean Patent No. 10-0555375 Korean Patent No. 10-0632419

However, all of the prior art documents 1 to 9 have a disadvantage in that the noise reduction efficiency is low by reducing the noise by the sound absorbing material or the resonance space provided on both sides in the course of the passage of the noise-containing fluid through the flow path.

That is, in the process of passing through the flow path formed in the longitudinal direction, noise is removed only by the sound absorbing material or the resonance space formed on both sides of the flow path, and thus noise reduction efficiency is low.

Accordingly, in order to increase the efficiency of noise reduction, it also has a conditional disadvantage that the length of the silencer must be increased.

Particularly, the pores formed so as to introduce noise into the silencers of the prior art documents 1 to 9 are formed in a planar manner on the planar plate, so that a part of the noise enters through the pores and returns to the lowered sound absorption efficiency .

The main object of the present invention is to provide a noise reduction device comprising at least one noise reduction means formed in the form of a pocket in a flow path and at the same time, The present invention provides a silencer including an embossed perforation which can minimize the noise emitted by the inlet through the embossed holes and effectively reduce the low frequency noise.

Another object of the present invention is to maximize the noise attenuation efficiency in the pocket type noise reducing means.

Another object of the present invention is to minimize the generation of negative pressure in the process of passage of noise-containing fluid.

A further object of the present invention is to make it possible to uniformly introduce noise into the sound absorbing member.

According to an aspect of the present invention, there is provided an exhaust gas purifying apparatus including an inlet formed at one side of a housing to allow a fluid containing noise to pass therethrough, a discharge port formed at an opposite side of the inlet, And a plurality of embossed perforations are formed on the open front side on the inlet side of the flow path, and the other surface is provided with a plurality of Pocket type sound absorbing member; And a plurality of embossed perforations formed between the inner surface of the housing and the channel so that a sound absorbing material is interposed therebetween.

And a sound absorbing material is interposed between the inner side surface of the sound absorbing member and the sound absorbing inner surface perforated plate.

The sound-absorbing member further includes an area of the sound-absorbing member disposed on the side of the discharge port that is wider than an area of the sound-absorbing member on the side of the inlet.

Wherein the inner perforated plate on both sides of the inner surface of the inlet port side is formed in at least two layers with a sound absorbing material interposed therebetween so that the flow path area on the side of the outlet port side is formed wider than the flow path area on the inlet side, And the inner perforated plate on the inlet side side is formed to be smaller in thickness than the inner perforated plate through the sound absorbing material.

The embossed perforation is formed such that the outer diameter of the embankment hole on the side of the flow path on which the noise is introduced is wide and the inner diameter of the side on which the noise is introduced is narrow. In order to prevent the noise introduced between the embossed perforation and the embossed perforation from being emitted, And the pocket space on the inner diametric side opposite to the piercing hole is wide and the outer diametric side on the opposite side is narrowly formed.

Wherein the embossed perforation has an outer diameter area of 50% or more in proportion to the total area of the perforated plate, the inner diameter area is less than 40% in proportion to the total area of the perforated plate, 25, the inner diameter is 2 to 15, and the height between the outer diameter and the inner diameter is 0.8 to 10 mm.

A circular arc-shaped dispersion network is further provided in front of the front perforated plate of each sound absorbing member.

The present invention is characterized in that at least one or more noise reduction means formed in the form of pockets in the flow path are arranged side by side and the noise introduced by the noise reducing means and the embossed perforation formed on the inner surface of the silencer is again transmitted through the embossed perforation By minimizing the emission, it is possible to maximize the attenuation efficiency of the noise, and the noise from the fluid discharged through the silencer is minimized, so that the surroundings can be maintained quietly.

Particularly, it has an effect of efficiently reducing not only high frequency but also low frequency noise of 250 Hz or less by a pocket type sound absorbing member.

In addition, it is possible to maximize the noise attenuation efficiency in the pocket type noise reducing means, thereby further reducing the noise.

In addition, it is possible to minimize the generation of negative pressure in the process of passage of noise-containing fluid, so that it is possible to maximize the noise removal efficiency without causing any trouble to the fluid flow.

In addition, by allowing the noise to be uniformly introduced into the sound-absorbing member, it is possible to maximize the sound-attenuating efficiency in the sound-absorbing member.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view and partly enlarged cross-
FIG. 2 is a sectional view for explaining a use state according to FIG. 1,
FIG. 3 is a graph showing data indicating noise measured by the present invention,
Figure 4 is a graph showing measured data according to Figure 3,
5 is a cross-sectional view showing various other embodiments of the sound absorbing member of the present invention,
6 is a cross-sectional view for explaining another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The present invention is not limited to the embodiments.

FIG. 1 is a cross-sectional view and a partially enlarged cross-sectional view for illustrating the present invention, and FIG. 2 is a cross-sectional view for explaining a use state according to FIG.

An inlet 102 formed at one side of the housing 100 to allow noise to pass therethrough in the air-conditioning duct, various equipment or facilities, and a discharge port 104 formed at the opposite side of the inlet 102 And a flow path 103 provided inside the housing 100 between the inlet 102 and the outlet 104. The silencer 1 shown in Fig.

The present invention is characterized in that at least one or more noise reduction means formed in the form of pockets in the flow path are arranged side by side and the noise introduced by the noise reducing means and the embossed perforation formed on the inner surface of the silencer is again transmitted through the embossed perforation Thereby minimizing the emission of noise and effectively reducing the low frequency noise.

Particularly, the noise contained in the fluid is divided into a high-frequency noise of 600 to 4,800 Hz and a low-frequency noise of 250 Hz or less. The high-frequency noise is removed to some extent by the sound-absorbing material. However, It is general to reduce by using resonance phenomenon.

The present invention can maximally reduce the noise in the low frequency range, that is, the low frequency noise of 150 Hz or less generated in the medium speed engine or the low speed engine by the pocket type sound absorbing member.

The silencer 1 according to the present invention is provided with a front piercing plate 12 in which a plurality of embossed perforations 11 are formed on the open front side of the inlet port 102 on the flow path 103, A plurality of pocket-like sound-absorbing members 10 arranged side by side with a sound-absorbing material 14 such as ordinary glass fiber or the like; And a plurality of embossed perforations (11) formed between the inner surface of the housing (100) and the flow path (103) so that a sound absorbing material (14) such as a glass fiber is interposed therebetween; .

The open portion of the pocket-like sound-absorbing member 10 is formed to be wider than the diameter of the inlet 102, so that most of the noise introduced from the inlet is introduced.

Accordingly, the noise introduced through the inlet is introduced through the embossed hole of the front perforated plate provided in the open portion of the first sound absorbing member on the inlet side, and then the noise is primarily attenuated by reducing the noise by the sound absorbing material provided therein . At this time, the low-frequency noise during the noise is introduced into the pocket-type sound-absorbing module and is reduced to the maximum with the high-frequency noise due to the condition that it is not emitted to the outside by the embossing hole.

Then, a part of noise emitted from the sound-absorbing member provided at the inlet port side or a part of the noise included in the fluid flows through the flow path, and the sound-absorbing material provided between the inner surface of the housing again through the embossed hole of the inner perforated plate, It is reduced by being attenuated secondarily together. At this time, the low frequency noise is reduced to the utmost without being discharged to the side of the channel by the inner perforated plate by the embossed piercing.

Further, noise of a part of the sound absorbing member on the inlet side and the inner side perforated plate on the inlet side thereof is introduced again through the embossed hole of the front perforated plate of the sound absorbing member provided on the discharge port side, As shown in FIG.

In addition, some noise of the sound-absorbing member or the flow path on the side of the discharge port is also attenuated by the sound-absorbing material provided between the inner side surfaces of the housing by the embossed piercing of the inner side pier plate on the discharge port side.

In particular, the present invention has a technical feature of further reducing low-frequency noises more effectively by preventing low-frequency noises of 250 Hz or less in noise from being emitted to the outside again in a plurality of pocket-like sound-absorbing members.

Accordingly, since a plurality of pocket type sound absorbing members are provided inside the housing, not only the noise can be damped to the utmost, but also a part of the noise is damped on the inner surface of the housing. Thus, not only high frequency noise but also damping efficiency of low frequency noise It has conditions that can be maximized.

In addition, the embossed punched hole enhances the attenuation efficiency of the noise due to the structure which can not return the introduced noise again as will be described later.

A sound absorbing inner pier plate 20A having an embossed pierced hole 11 formed at a predetermined distance from the inner side surface of the sound absorbing member 10 is formed between the inner side surface of the sound absorbing member 10 and the sound absorbing member 10 14 are interposed.

In other words, the noise introduced into the sound-absorbing member and the noise introduced through the embossed holes of the sound-absorbing member and the sound-absorbing inner surface piercing plate are once again attenuated in the sound-absorbing material, thereby further increasing the damping efficiency of the noise.

In addition, the sound absorbing member 10 may further include a larger area of the sound absorbing member 10 disposed on the discharge port 104 side than the sound absorbing member 10 on the inlet 102 side.

In other words, the wider area of the sound-absorbing member on the side of the discharge port is intended to dampen the noise by maximally introducing the noise emitted from the sound-absorbing member on the side of the inlet. That is, a part of the noise emitted from the sound-absorbing member on the inlet side is absorbed by the sound-absorbing member on the side of the discharge hole, which is wider than the sound-absorbing member, so that some noise is prevented from being discharged through the discharge opening.

The inner perforated plate 20 on both sides of the inlet port 102 side is formed with at least a sound absorbing material 14 therebetween so that the flow path area on the side of the inlet port 102 side is wider than the flow path area on the side of the inlet port 102 The inner perforated plate 20 on both sides of the inner surface of the discharge port 104 is formed to be less than the inner perforated plate 20 on the side of the inlet 102 with the sound absorbing material 14 interposed therebetween . At this time, the discharge port is also formed in a larger area than the area of the inlet.

That is, when the area of the noise-containing fluid passing through the flow path is narrower than the area of the flow-out side, a negative pressure is generated and smooth flow is not performed. Thus, the flow path area on the discharge port side It is preferable that the flow of the fluid can be smoothly performed.

On the other hand, the embossed perforations (11) for preventing the inflow noise from being discharged through the inflow portion are larger in outer diameter (D) on the side of the flow path (103) The inner diameter C of the embossed perforation 11 is narrow and the inner diameter side space facing the embossed perforation 11 is wide so as not to radiate the noise introduced between the embossed perforation 11 and the embossed perforation 11 , And the opposite outer diameter side further includes respective pocket spaces (11A) formed to be narrow.

In other words, the noise included in the fluid flows through the embossed hole, that is, the embossed hole having a wide outer diameter and narrow inner diameter smoothly flows into the sound absorbing material, and then the sound is absorbed and attenuated.

In addition, since the noise introduced through the embossed hole is not attenuated in the sound absorbing material and a part of the noise can not be radiated to the outside, since the inner diameter is formed narrower than the outer diameter due to the characteristic of the embossed hole, And it is possible to minimize the radiation to the outside by the pocket space formed especially between the embossed punch and the embossed punch.

That is, the inner diameter of the embossed perforation is narrow, and the pocket space formed between the embossed perforation and the embossed perforation is formed by the portion where the inner diameter is located is formed so as to be trapped in the pocket space, It can be minimized.

Accordingly, the noise introduced through the embossed hole is minimized to the outside, thereby maximizing the noise reduction efficiency by maximally attenuating the built-in sound absorbing material. Particularly, since the noise introduced through the embossed hole by the pocket space formed between the embossed hole and the embossed hole is minimized, the noise is sufficiently reduced to further reduce the noise .

In addition, the outer diameter area of the embossed perforations 11 is formed to be 50% or more in proportion to the total area of each of the plates, that is, the front perforated plate, the inner perforated plate, and the sound absorbing inner perforated plate, The embossed perforation is formed to have an outer diameter of Φ 3.5 to 25, an inner diameter of Φ 2 to 15, and a height between an outer diameter and an inner diameter of 0.8 to 10 mm.

That is, when the outer diameter of the embossed perforation is less than or equal to 3.5, the sound absorption efficiency is lowered. When the embossed perforation is more than 25, the perforated area is wider than the overall area of each plate, Range I will do is right. The inner diameter also has the same condition as the above reason.

When the height is less than 0.8 mm, the height is too low to be radiated to the outside after the noise is introduced. If the height is more than 2.4 mm, the inner diameter is narrower than the above diameter, The above height is appropriate in order to prevent the possibility of deterioration.

In addition, the pocket space 11A has a wider space on the inner diameter side facing the embossed perforation 11 and a narrower outer diameter side on the opposite side. That is, when the noise introduced through the embossed hole is radiated to the outside, the pocket space on the inner diameter side is formed to be wide, thereby minimizing the conditions that can be radiated to the outside.

Accordingly, since the embossed punch has a wide outer diameter and a narrow inner diameter, it is possible to minimize the amount of noise introduced into the punch while increasing the efficiency of noise introduction, and in particular, The space is rather wide on the inner diameter side and narrow on the outer diameter side, thereby minimizing the condition that the noise can be radiated to the outside.

Accordingly, the present invention provides a sound absorbing device comprising: a plurality of sound absorbing members arranged in parallel to at least one side of a flow path, an inner side of the housing being smoothly made to flow, It has a condition to maximize the noise reduction efficiency.

As described above, the noise level is remarkably reduced by using the silencer of the present invention, and the data and the graph measured using the 1/3 OCTAVE BAND ANALYZER NA-27, which is a known SOUND LEVEL METER, Through 4. At this time, the noise measuring device is located outside the discharge port side and is measured.

FIG. 3 is a graph showing noise measured by the present invention, and FIG. 4 is a graph showing measured data according to FIG.

Here, the noise included in the fluid is divided into a high frequency noise of 600 to 4,800 Hz and a low frequency noise of 250 Hz or less.

Usually, high-frequency noise is removed to some extent by a sound-absorbing material, but in the case of low-frequency noise, it is generally reduced by using a resonance phenomenon due to a characteristic that is not reduced by a sound-absorbing material.

However, it can be confirmed that the present invention is remarkably reduced by the sound absorbing member provided with a plurality of pockets and the embossed punch.

Therefore, as shown in the data and graphs of FIG. 3 and FIG. 4, it can be clearly confirmed that noise is remarkably reduced by each noise level, and in particular, the noise reduction efficiency at low frequencies as well as high frequencies is excellent Can be confirmed.

5 is a cross-sectional view showing another embodiment of the sound absorbing member of the present invention.

As shown in the drawing, the pocket-type sound-absorbing member of the present invention installed in the flow path can be realized in various structures capable of further reducing the low-frequency noise as well as the structure described above.

That is, as shown in (a), a plurality of diaphragms 10A having embossed perforations in the interior of the diaphragm 10 may be provided, and each diaphragm 10A may be provided with the respective diaphragm 14 have.

At least one or more resonance spaces 10B may be formed by at least one diaphragm 10A having embossed pores formed therein as shown in FIGS. 5B and 5C, in which the sound absorbing material 14 is filled.

These various embodiments are intended to minimize the low frequency noise as well as the high frequency noise introduced into the sound absorbing member.

That is, the noise introduced through the embossed perforations of the front perforated plate is passed through the plurality of partition plates formed with the embossed perforations again through the sound absorbing material and the respective sound absorbing materials, thereby preventing the once introduced noise from being emitted to the outside Thereby maximizing the noise reduction efficiency. Particularly, reduction of low frequency noise can be performed more efficiently.

In addition, at least one resonance space formed before or after the sound-absorbing material or between the sound-absorbing material before and after the sound-absorbing material can be formed. Such a resonance space effectively attenuates low-frequency noise as described above. Efficient damping can be achieved in the resonance space without emitting the incoming noise to the outside.

Accordingly, it is preferable to apply a sound absorbing member suitable for the place or condition in which the silencer is installed so that the noise removing efficiency can be further increased.

6 is a cross-sectional view for explaining another embodiment of the present invention.

As shown in the drawings, the noise introduced into the sound-absorbing member can be uniformly dispersed and introduced into the sound-absorbing member.

In addition, an annular dispersing net 16 is further provided in front of the front perforated plate 12 of each sound absorbing member 10. At this time, the dispersion net can be mounted on the sound absorbing member by welding, bracketing, or bolting in a known manner.

Therefore, the noise included in the fluid flowing through the inlet or the flow path is uniformly dispersed and introduced into the sound-absorbing member by the dispersion net, thereby increasing the noise damping efficiency in the sound-absorbing member and maximizing the noise reduction efficiency I have.

1: Silencer
10: sound-absorbing member 10A: diaphragm
10B: resonance space 11: embossed type
11A: Pocket space 12: Front pier
14: Sound absorbing material 16: dispersion net
20: Inner perforated plate 20A: Sound absorbing inner surface perforated plate
100: Housing
102: inlet 103:
104:

Claims (7)

A silencer including an inlet formed at one side of the housing to allow a fluid containing noise to pass therethrough, a discharge port formed at an opposite side of the inlet, and a flow path provided inside the housing between the inlet and the outlet,
A plurality of pocket-like sound-absorbing members disposed on the flow path on the front side and having a front perforated plate formed with a plurality of embossed perforations on an open front side thereof, the other side of which is provided with a sound- And
And a plurality of embossed perforations formed between the inner surface of the housing and the flow path so that a sound absorbing material is interposed therebetween. The method according to claim 1,
And a sound absorbing material is interposed between the inner side surface of the sound absorbing member and the sound absorbing inner surface perforated plate, wherein a sound absorbing material is interposed between the inner side surface of the sound absorbing member and the sound absorbing inner surface perforated plate, . The method according to claim 1,
Wherein the sound absorbing member further includes an area of a sound absorbing member disposed on a side of a discharge port side wider than an area of the sound absorbing member on an inlet side of the silencer. The method according to claim 1,
Wherein the inner perforated plate on both sides of the inner surface of the inlet port side is formed in at least two layers with a sound absorbing material interposed therebetween so that the flow path area on the side of the outlet port side is formed wider than the flow path area on the inlet side, Further comprising a plurality of embossed perforations formed on the inner side of the inlet port side with a sound absorbing material interposed therebetween. 5. The method according to any one of claims 1 to 4,
The embossed perforation is formed such that the outer diameter of the embankment hole on the side of the flow path on which the noise is introduced is wide and the inner diameter of the side on which the noise is introduced is narrow. In order to prevent the noise introduced between the embossed perforation and the embossed perforation from being emitted, Wherein each of the pocket spaces is formed to have a wider space on the inner diameter side opposite to the bore hole and a narrower outer diameter side on the opposite side. 6. The method of claim 5,
Wherein the embossed perforation has an outer diameter area of 50% or more in proportion to the total area of the perforated plate, the inner diameter area is less than 40% in proportion to the total area of the perforated plate, 25, the inner diameter is 2 to 15, and the height between the outer diameter and the inner diameter is 0.8 to 10 mm. 5. The method according to any one of claims 1 to 4,
Wherein a circular arc-shaped dispersion net is further provided in front of the front perforated plate of each sound absorbing member.

Images