WO2017146310A1

WO2017146310A1 - Silencer including sound absorbing perforated plate and sound absorbing module

Info

Publication number: WO2017146310A1
Application number: PCT/KR2016/006011
Authority: WO
Inventors: 김창순; 김승평; 김승국; 김준범
Original assignee: 주식회사 씨앤월드
Priority date: 2016-02-26
Filing date: 2016-06-07
Publication date: 2017-08-31

Abstract

The present invention provides a sound absorbing perforated plate comprising pocket spaces, which has a wide outer diameter of a side on which noise is being introduced and a narrow inner diameter of a side on which noise has been introduced so as to maximize a sound absorption efficiency by minimizing noise introduced through embossed perforations from being released to the outside again, wherein each of the pocket spaces is formed so as to prevent noise introduced between the embossed perforations from being released. As such, the present invention has the effects of efficiently reducing noise and thus creating quiet surrounding environments in areas where noise is generated.

Description

Silencer including sound absorbing punching plate and sound absorbing module

The present invention relates to a silencer including a sound absorbing perforated plate and a sound absorbing module for minimizing the emission of the noise introduced by the embossed perforations to the outside and in particular, effectively reducing the low frequency to maximize the sound absorption efficiency. .

In general, a silencer installed in each duct provided for air conditioning of various buildings, or an enclosure covering a roadside to prevent noise from radiating and preventing noise from interfering with the heat dissipation of the soundproof wall or engine is included in the fluid. It is installed and used to reduce the noise.

Such a muffler, soundproof wall or enclosure is provided with perforations for absorbing noise.

Silencers are classified into four types: sound absorbing type, expansion type, resonance type, and interference type according to the noise reduction method.

Sound-absorbing type is a method of absorbing sound to reduce noise by installing sound-absorbing materials such as glass fiber that can absorb sound in a part of the pipeline. To reduce noise.

In addition, the resonance type is installed by installing the neck part in the pipeline and connecting the cavity to create a resonance to absorb the energy of the sound wave into the air vibration of the cavity, the interference type is divided into two paths through which the sound wave is transmitted It refers to a method of attenuating a sound by interference by making a path difference a half wavelength of a corresponding sound wave.

Prior art related to sound-absorbing silencers is 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"), Korean Patent Publication 10-2010-0134274 (hereinafter referred to as' prior art document 3 '), Republic of Korea Patent No. 10-1030440 (hereinafter referred to as' prior art document 4'), Republic of Korea Patent No. 10-0939702 (hereinafter ' Prior art document 5 '), Korea Patent Publication No. 10-2013-0104852 (hereinafter referred to as' prior art document 6') has been published.

Prior art related to the expansion silencer has been published in Republic of Korea Patent No. 10-1016601 (hereinafter referred to as 'prior art document 7').

Prior art related to a resonance silencer has been published in Republic of Korea Patent No. 10-0555375 (hereinafter referred to as "prior art document 8").

In addition, the prior art related to the silencer using sound absorption and resonance has been published in Republic of Korea Patent No. 10-0632419 (hereinafter referred to as "prior art document 9").

Prior arts related to soundproof walls, etc., include Republic of Korea Patent No. 10-0925528 (hereinafter referred to as 'prior art document 10'), Republic of Korea Patent No. 10-1143415 (hereinafter referred to as 'prior art document 11'), Republic of Korea Patent Publication No. As published in 10-2016-0017572 (hereinafter referred to as 'prior art document 12'), a perforated plate having a plurality of perforations is installed on the side where noise is generated, and a sound absorbing material is provided therein, and is introduced through the perforated hole. It is used to absorb and reduce the noise.

In addition, an enclosure, not shown, is provided with a perforated plate in which a plurality of perforations are formed so that noise can flow into the sound absorbing material side.

Prior Art Document 1-Republic of Korea Patent No. 10-0918700

Prior Art Document 2-Republic of Korea Patent No. 10-0924958

Prior Art Document 3-Korean Patent Publication No. 10-2010-0134274

Prior Art Document 4-Republic of Korea Patent No. 10-1030440

Prior Art Document 5-Republic of Korea Patent No. 10-0939702

Prior Art Document 6-Republic of Korea Patent Publication No. 10-2013-0104852

Prior Art Document 7-Korean Patent Registration No. 10-1016601

Prior Art Document 8-Republic of Korea Patent No. 10-0555375

Prior Art Document 9-Korea Patent Registration No. 10-0632419

Prior Art Document 10-Republic of Korea Patent No. 10-0925528

Prior Art Document 11-Korean Patent Registration No. 10-1143415

Prior Art Document 12-Republic of Korea Patent Publication No. 10-2016-0017572

However, the prior art documents 1 to 9 have the disadvantage of lowering the noise reduction efficiency by reducing the noise by the sound absorbing material or the resonance space provided on both sides of the flow path in the fluid containing the noise flow path.

That is, as the noise is removed only by the sound absorbing material or the resonance space formed on both sides of the flow path in the course of the passage formed in the longitudinal direction has a disadvantage of low noise reduction efficiency.

And above all, the perforations formed in the perforated plates formed in the prior art documents 1 to 9 as well as the prior art documents 10 to 12 are formed on a flat surface that is vertically penetrated on a flat plate, so that some noise introduced into the perforations is intact. It also has the disadvantage of lowering the sound absorption efficiency due to the problem emitted.

The technical problem of the present invention for solving the conventional problems as described above is to minimize the noise introduced by the embossed perforations again to the outside, and in particular to effectively reduce the low frequency to maximize the sound absorption efficiency To provide a sound absorbing perforated plate.

Another technical problem of the present invention is to provide a silencer including a sound absorbing module which can reduce high frequency noise as well as low frequency noise even more efficiently.

The solution of the present invention for solving the technical problem as described above is a sound absorbing perforated plate formed with a plurality of embossed perforations so that the noise contained in the fluid is absorbed after being absorbed again, the embossed perforations The outer diameter of the side on which the noise is introduced is wide, and the inner diameter of the side on which the noise is introduced is formed narrow, and each pocket space is formed so that the noise introduced between the embossed perforation and the embossed perforation is not emitted.

The outer diameter area of the embossed perforation is formed in more than 50% in proportion to the total area of the perforated plate, the inner diameter area is formed in less than 40% in proportion to the total area of the perforated plate, the outer diameter of the embossed perforated is Φ 3.5 ~ 25, the inner diameter is Φ2-15, and the height between the outer diameter and the inner diameter is 0.8-10mm.

The pocket space is wider on the inner diameter side and narrower on the opposite outer diameter side to face the embossed perforation.

A silencer comprising an inlet formed on one side of the housing to allow fluid containing noise to pass therethrough, a discharge port formed on the opposite side of the inlet, and a flow path provided inside the housing between the inlet and the discharge port, wherein the inlet is formed on the flow path. A pocket perforated module having a front perforated plate having a plurality of embossed perforations formed on the open front side of the side, and the remaining surfaces being blocked and provided with a sound absorbing material therein; And respective inner surface perforated plates on which a plurality of embossed perforations are formed and installed so that a sound absorbing material is interposed between the inner surface of the housing and the flow path.

A sound absorbing inner surface perforated plate is formed in which the embossed perforations are formed at predetermined intervals with the inner side of the sound absorbing module, and a sound absorbing material is interposed between the inner side of the sound absorbing module and the sound absorbing inner surface perforated plate.

Further comprising a plurality of partition plates formed with a plurality of embossed perforations between the sound absorbing material of the sound absorbing module at predetermined intervals.

The sound absorbing part of the sound absorbing module further includes at least one resonance space without the sound absorbing material formed between the sound absorbing material by at least one partition plate formed with a plurality of embossed perforations.

The open front surface of the sound absorbing module further includes an arc-shaped dispersion net that is provided so that the incoming noise is uniformly distributed.

The embossed perforated has a wider outer diameter of the side where the noise is introduced into the flow path, a narrower inner diameter of the side into which the noise is introduced, and the embossed type so that the noise introduced between the embossed perforated and the embossed perforated is not emitted. Opposite the perforation, the space on the inner diameter side is wider, the opposite outer diameter side further comprises a respective pocket space is formed narrow.

The pocket type sound absorbing module further includes at least two or more pieces provided between the inlet and the discharge port, and the sound absorbing module further includes a wider area of the sound absorbing module disposed at the discharge port side than the sound absorbing module at the inlet side. do.

The inner perforated plate on both sides of the inner surface of the inlet side is formed in at least two or more layers with a sound absorbing material interposed so that the passage area of the outlet side is wider than the flow path side of the inlet side, and the inner perforated plate on both sides of the inner surface of the outlet side The sound absorbing material is interposed between the inner surface of the inlet port further comprises a less ply formed.

Sound absorption module provided in the flow path of the silencer including an inlet formed on one side of the housing so that the fluid containing the noise, a discharge port formed on the opposite side of the inlet and a flow path provided in the housing between the inlet and the discharge opening As the sound absorbing module, the sound absorbing material provided therein; And a sound absorbing housing having a plurality of embossed perforations formed at a predetermined interval so that the sound is absorbed on the outer circumferential surface surrounding the sound absorbing material and is not emitted to the outside again.

The front end of the sound absorbing housing is formed in a curved surface, and the rear end is formed in each inclined surface inclined toward the middle side.

The present invention by maximizing the sound absorption efficiency by minimizing the emission of the noise introduced by the embossed perforations again to the outside, thereby having the effect of reducing the high frequency noise as well as the low frequency noise even more efficiently, It has the effect of creating a quiet surrounding in the area where noise occurs.

In addition, by providing a silencer including a sound absorbing module that can reduce the high-frequency noise as well as low-frequency noise more efficiently, it also has the effect of providing a quiet working environment by minimizing loud noise in various structures and industrial sites. .

1 is a production diagram for explaining a first embodiment of the present invention,

2 is a partially enlarged cross-sectional view for explaining the present invention according to FIG. 1;

3 is a cross-sectional view for explaining a second embodiment of the present invention;

4 is a cross-sectional view for explaining a use state according to FIG. 3;

5 is a cross-sectional view for explaining different embodiments of the sound absorbing module according to FIG. 3;

6 is a cross-sectional view for explaining another embodiment according to FIG. 5;

7 is a cross-sectional view for explaining a third embodiment of the present invention;

8 is a cross-sectional view for explaining a use state according to FIG. 7;

9 is a cross-sectional view for explaining another embodiment according to FIG. 7;

10 is a cross-sectional view for explaining a fourth embodiment of the present invention;

FIG. 11 is a cross-sectional view for describing a use state according to FIG. 10.

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 or limited by the embodiments.

1 is a manufacturing diagram for explaining a first embodiment of the present invention, Figure 2 is a partially enlarged cross-sectional view for explaining the present invention according to FIG.

As shown in the drawing, a sound absorbing perforated plate 1 having a plurality of embossed perforations formed thereon is provided so that the noise contained in the fluid is absorbed and is not emitted again through the absorbed portion.

Sound-absorbing perforated plate (1) is a conventional silencer installed in each duct provided for air conditioning of various buildings, or an enclosure to cover the roadside so as not to radiate noise without disturbing the soundproof wall or engine heat dissipation (enclosure) It is applied to the case, plate, or housing type that noise in the fluid can enter. In addition, the sound-absorbing perforated plate in which the embossed perforated plate of the present invention is formed can be applied to any device or place for attenuating the sound.

The present invention is to minimize the noise introduced by the embossed perforations again to the outside, and in particular to effectively reduce the low frequency to maximize the sound absorption efficiency.

The embossed perforated 1A formed on the sound absorbing perforated plate 1 according to the present invention has a wide outer diameter D on the side where noise is introduced, and a narrow inner diameter C on the side where the noise is introduced, Each pocket space 1B is formed so that the noise introduced between the embossed perforations 1A and the embossed perforations 1A is not emitted.

In addition, the outer diameter area of the embossed perforated 1A is formed in a proportion of 50% or more in proportion to the total area of the perforated plate so as to increase the sound absorption efficiency of the noise, and the inner diameter area so as to minimize the emission of the incoming noise again. Is preferably less than 40% in proportion to the total area of the perforated plate.

In addition, the outer diameter D of the embossed perforated 1A is Φ 3.5-25, the inner diameter C is Φ2-15, and the height H between the outer diameter and the inner diameter is preferably 0.8-10 mm. That is, the outer diameter and the inner diameter are preferably formed in a ratio of about 1.5: 1.

In other words, when the outer diameter is Φ 3.5 or less, the sound absorption efficiency is low, and when Φ 25 or more, the perforated area is larger than the overall area of each plate, so that the area where the incoming noise is radiated is widened. Will do. The inner diameter also has the same conditions as the above reasons.

And if the height is also less than 0.8mm, the height is too low to have a condition that can be radiated to the outside after the noise is introduced, if more than 10mm with a number of cumbersome problems in processing, the inner diameter is narrower than the above-mentioned diameter sound absorption efficiency The height mentioned above will be appropriate in order to prevent this from falling.

On the other hand, the pocket space (1B) is wider on the inner diameter side, the opposite outer diameter side is formed narrower to face the embossed perforations (1A). That is, when the noise introduced through the embossed perforations is discharged to the outside again, the pocket space on the inner diameter side is widened to minimize the condition that can be radiated to the outside.

Accordingly, the embossed perforated has a condition that can minimize the release of the incoming noise to the outside while increasing the efficiency of inflow of noise as the outer diameter is wide and the inner diameter is narrow, in particular, formed between the embossed perforated The pocket space is rather wide in the inner diameter side and narrow in the outer diameter side is to minimize the condition that the noise can be emitted to the outside.

The production of the sound-absorbing perforated plate 1 in which the embossed perforated plate 1A of the present invention is formed is performed by drilling a plurality of perforations 1a at a predetermined interval by a known press work or the like on a flat plate P1 of a conventional metal plate material. Thereafter, the perforated plurality of perforations 1a are formed again by pressurization by a normal press work or the like to form a sound-absorbing perforated plate 1 in which each embossed perforated plate 1A protruding upward or downward is formed. . At this time, the embossed perforations 1A are formed under the conditions described above. In addition, the upper or lower portion of the embossed perforated is processed to protrude to the upper or lower according to the position of the upper and lower molds, it is preferable to selectively apply according to the working conditions.

The plurality of perforations and embossed perforations are formed by conventional progressive molds in which at least one or more molds are sequentially processed.

Here, the embossed perforations may be formed by a single press operation of the flat plate, but at the same time the end of the inner diameter side projecting is sharply formed when trying to change the diameter of the inner diameter and the outer diameter together with the perforation at a time, the post-treatment operation When performing the back may not only cause injury to the operator, but also has the disadvantage that may cause interference or damage with other parts.

Accordingly, it is preferable to first form a plurality of perforations and then form embossed perforations sequentially by pressing again, as the end of the inner diameter is directly formed at one time as the end of the inner diameter is formed flat or close to the plane. Problems caused by this can be solved.

Therefore, the embossed perforation provided in the sound absorbing perforated plate of the present invention has a condition that can maximize the sound absorption efficiency of the noise by minimizing that the incoming noise is radiated to the outside while the inflow of the noise is smoothly made.

Therefore, when applied to a muffler, soundproof wall or enclosure, etc., which are applied to cancel various noises, the noise reduction efficiency is also maximized.

3 is a cross-sectional view for describing a second embodiment of the present invention, and FIG. 4 is a cross-sectional view for explaining a use state according to FIG. 3.

As shown, an inlet 112 formed on one side of the housing 110 to allow fluid containing noise to pass therethrough, an outlet 114 formed on the opposite side of the inlet 112, and the inlet 112 and an outlet Presented is a silencer 100 that includes a flow passage 113 provided inside the housing 110 between the 114.

The second embodiment of the present invention has a technical configuration to efficiently reduce high frequency noise as well as low frequency noise.

That is, the noise contained in the fluid is largely divided into 600 ~ 4,800 kHz high frequency noise and 250 kHz or less low frequency noise, high frequency noise is eliminated to some extent by the sound absorbing material, but low frequency noise due to the characteristics that are not reduced by the sound absorbing material Reduction using resonance is common.

Accordingly, in the second embodiment of the present invention, the pocket type sound absorbing module can reduce the noise in the low frequency region, that is, the low frequency noise of 150 Hz or less generated by the medium speed engine or the low speed engine, to the maximum.

The present invention is provided with a front perforated plate 12 formed with a plurality of embossed perforations (1A) to the open front of the inlet 112 side on the flow passage 113, the other surface is blocked inside the sound absorbing material (S) Pocket type sound absorption module 10 provided; And each inner surface perforated plate 20 on which a plurality of embossed perforations 1A are formed and installed between the inner surface of the housing 110 and the flow path 113 so as to interpose the sound absorbing material S.

In the above-described embossed perforations 1A, the outer diameter D of the side on which the noise flows on the side of the flow path 113 is wide, and the inner diameter C of the side on which the noise is introduced is formed narrow, and the embossed perforated 1A is formed. ) And each pocket space 1B having a wider space on the inner diameter side and a narrower side on the opposite outer diameter side to face the embossed perforation 1A so that the noise introduced between the) and the embossed perforations 1A is not emitted. Include. Here, since the plurality of embossed perforations have the same conditions as those of the first embodiment of the present invention, detailed description thereof will be omitted.

Accordingly, the noise introduced through the inlet is introduced through the embossed perforations of the front perforated plate provided at the open portion of the sound absorbing module on the inlet side, and then attenuated and reduced primarily by the sound absorbing material provided therein. At this time, the low-frequency noise of less than 250 kHz of the noise has a condition that is reduced while being attenuated to the maximum with high frequency noise due to the condition that is not released to the outside by the embossed perforation after entering into the pocket-type sound absorbing module.

Then, some of the noise emitted from the sound absorbing module provided on the inlet side or some of the noise contained in the fluid flows through the flow path, and is absorbed by the sound absorbing material provided between the inner surfaces of the housing through the embossed perforations of the inner perforated plate. It is reduced by being attenuated secondarily together. At this time, the low frequency noise is reduced to the maximum without being emitted to the flow path side by the inner perforated plate by the embossed perforated plate.

Thus, according to the second embodiment of the present invention, as the pocket-type sound absorbing module is provided inside the housing, not only the noise can be attenuated as much as possible, but also a part of the noise is also attenuated on the inner side of the housing, so that the high frequency noise, in particular the low frequency noise, can be reduced. The damping efficiency also has a condition to maximize the noise reduction efficiency.

On the other hand, the inner side of the sound absorbing module 10 is formed with a sound absorbing inner surface perforated plate 20A is formed at a predetermined interval with the inner side of the sound absorbing module 10, the inner side of the sound absorbing module 10 and the sound absorbing inner surface perforated plate 20A Sound absorbing material S is interposed. This attenuates the noise introduced into the sound absorbing module and also attenuates the noise introduced through the inner side of the sound absorbing module and the embossed perforation of the sound absorbing inner surface perforated plate once again in the sound absorbing material, thereby further increasing the noise reduction efficiency.

As described above, reference is made to [Table 1] to [Table 3] to which a layout, data, and graph for noise measurement in a silencer including a pocket-type sound absorbing module including an embossed perforation as a second embodiment of the present invention are attached.

[Table 1] to [Table 3] were measured from April 21, 2016 to May 03, 2016 by the Korea Institute of Construction and Environmental Testing and Research, and are listed in Report No. CT16-047805.

Table 1 is a layout for measuring noise in the present invention,

Table 2 shows the data measured by the present invention,

Table 3 is a graph showing the data measured by the present invention.

TABLE 1

TABLE 2

TABLE 3

As shown in the above [Table 1] to [Table 3], it can be seen that the high frequency as well as the low frequency noise are significantly reduced through data and graphs measuring noise by applying the present invention.

5 is a cross-sectional view for explaining different embodiments of the sound absorbing module according to FIG. 3.

As shown, in the above-described configuration, the sound absorbing module provided on the flow path suggests a technical configuration for reducing the low frequency noise even more efficiently in addition to the above-described technical configuration.

In other words, it is further provided that a plurality of partition plates 15 having a plurality of embossed perforations 1A are formed at predetermined intervals between the sound absorbing materials S provided in the sound absorbing module 10 as in (a). Include.

That is, the noise introduced through the embossed perforated plate of the front perforated plate passes through the sound absorbing material and passes through the plurality of partition plates and the respective sound absorbing materials formed with the embossed perforated again, thereby preventing the original noise from being emitted to the outside. Therefore, the noise reduction efficiency can be maximized. In particular, the reduction of low frequency noise can be performed more efficiently.

In addition, as illustrated in (b) to (d), the sound absorbing material is formed by at least one partition plate 15 in which a plurality of embossed perforations 1A are formed in the portion provided with the sound absorbing material S of the sound absorbing module 10. At least one resonance space (18) having no sound absorbing material (S) therebetween is further included. That is, the resonance space can be formed before or after the sound absorbing material in front of or behind the sound absorbing material.

As described above, the resonance space effectively attenuates low-frequency noise, so that the noise can be efficiently attenuated in the resonance space without emitting the noise introduced through the embossed perforations to the outside.

Accordingly, it is preferable to apply the sound absorbing module appropriate to the location or condition where the silencer is installed, so as to further increase the noise reduction efficiency. In particular, it has a characteristic which can reduce low frequency noise more efficiently.

6 is a cross-sectional view for describing another embodiment of FIG. 5.

As shown in the above configuration, the noise flowing into the sound absorbing module can be introduced while being distributed evenly into the sound absorbing module.

The open front surface of the sound absorbing module 10 further includes an arc-shaped dispersion netting board 10A so that the incoming noise is uniformly distributed and introduced. In this case, the dispersion net plate may be mounted by welding or bracket or bolting, which is a known method for the sound absorbing module.

Therefore, the noise contained in the fluid flowing through the inlet or the flow path is evenly distributed into the sound absorbing module by the dispersion mesh, thereby further increasing the noise damping efficiency in the sound absorbing module to maximize the noise reduction efficiency. Have

7 is a cross-sectional view for describing a third embodiment of the present invention, and FIG. 8 is a cross-sectional view for explaining a use state according to FIG. 7.

As shown in the above configuration, it is proposed a technical configuration that can further maximize the noise reduction efficiency as compared to having one sound absorption module in the housing.

Pocket type sound absorbing module 10 further includes a plurality of at least two or more between the inlet 112 and the discharge port 114, the pocket type sound absorbing module 10 is the sound absorbing module 10 of the inlet 112 side It further includes that the area of the sound absorbing module 10 disposed on the discharge port 114 side is wider.

That is, as described above, the noise flowed through or discharged from a part of the fluid in the state in which the noise is reduced through the first and second in the sound absorbing module and the inner perforated plate at the inlet side is returned to the front perforated plate of the sound absorbing module located at the outlet. After being introduced again through the embossed perforations, the sound is attenuated by the sound absorbing material provided in the interior.

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

In particular, according to the third embodiment of the present invention, by providing a plurality of sound absorbing modules, low frequency noise of 250 kHz or less among noise among the noises is not emitted to the outside in the plurality of pocket type sound absorbing modules, so that low frequency noise is also more efficient. It has a technical characteristic to reduce.

In addition, the sound absorbing module 10 may have a larger area of the sound absorbing module 10 disposed on the discharge port 114 side than the sound absorbing module 10 on the inlet 112 side. It is to attenuate the noise by introducing the noise as much as possible. In other words, while absorbing some of the noise emitted from the sound absorbing module on the inlet side of the sound absorbing module on the outlet side formed wider than the sound absorbing module, some of the noise is prevented from being emitted through the discharge port.

In addition, the inner perforated plate 20 on both sides of the inner surface of the inlet 112 side is formed of a sound absorbing material (S) so that the area of the passage 113 on the discharge port 114 side is wider than the area of the passage 113 on the inlet port 112 side. The inner perforated plate 20 on both sides of the inner surface of the discharge port 114 side has a sound absorbing material (S) between the inner surface perforated plate 20 on the inlet 112 side. It further includes being formed in fewer layers. 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 discharge side is narrower than the inflow side in the process of passing the passage of the noise, the negative pressure is generated so that the smooth flow is not achieved. Therefore, the flow area of the outlet side is larger than that of the inlet side. As it is formed wide, it is desirable to allow the fluid to flow smoothly.

As a result, by providing two or more plural pieces as compared with the arrangement of one sound absorbing module in the flow path, the efficiency of noise reduction can be further maximized, and in particular, high frequency noise and low frequency noise can be reduced more efficiently. Has

On the other hand, the plurality of sound absorbing module 10 according to the third embodiment of the present invention is also provided with a circular arc-shaped dispersion net plate 10A so that the incoming noise is uniformly distributed as shown in FIG. It includes more. In this case, the dispersion net plate may be mounted by welding or bracket or bolting, which is a known method for the sound absorbing module.

Therefore, the noise contained in the fluid flowing through the inlet or the flow path is evenly distributed and introduced into each of the sound absorbing modules by the dispersion mesh, thereby further increasing the noise attenuation efficiency in each sound absorbing module to further maximize the noise reduction efficiency. It has a condition to do it.

In this way, it can be seen that the silencer provided with a plurality of sound absorbing modules is also significantly reduced noise through the data and graphs measured as shown in the following [Table 4] to [Table 5].

In other words, data and graphs are measured using a 1/3 OCTAVE BAND ANALYZER NA-27, a known SOUND LEVEL METER. In this case, the noise measuring device is located outside the discharge port side and measured.

[Table 4] is a data indicating the noise measured by the third embodiment of the present invention,

Table 5 is a graph showing measured data according to FIG. 3.

TABLE 4

TABLE 5

Here, the noise contained in the fluid is largely divided into high frequency noise of 600 ~ 4,800 kHz, and low frequency noise of less than 250 kHz.

Usually, high frequency noise is removed to some extent by the sound absorbing material, but low frequency noise is generally reduced by using resonance due to the characteristic that is not reduced by the sound absorbing material.

However, it can be seen that the present invention is significantly reduced by the sound absorbing module and embossed perforations provided in plural in the form of pockets.

Therefore, as shown in the data and graphs of [Table 4] and [Table 5], it can be clearly seen that the noise is significantly reduced by the magnitude of each noise, and particularly, the noise reduction efficiency at the high frequency as well as the low frequency is excellent. It can be confirmed that it has a condition.

10 is a cross-sectional view for explaining a fourth embodiment of the present invention, and FIG. 11 is a cross-sectional view for explaining a use state according to FIG. 10.

As shown in the inlet 112 is formed on one side of the housing 100 so that the fluid containing the noise is installed in each duct provided for the air conditioning of various conventional buildings, not in the form of a silencer, and the inlet A flow path of the silencer 100 including a discharge port 114 formed on the opposite side of the 112 and a flow path 113 provided in the housing 110 between the inlet 112 and the discharge port 114. The sound absorption module 10-1 is presented.

Sound absorbing module 10-1 is a sound absorbing material (S), such as a conventional glass fiber provided therein; and a known press working so that the sound is absorbed on the outer peripheral surface surrounding the sound absorbing material (S) is not emitted to the outside again It includes; a sound-absorbing housing (10-1A) is formed through a plurality of embossed perforations (1A) at a predetermined interval. At this time, the embossed perforation bar described above will be omitted.

In addition, the front end of the sound-absorbing housing (10-1A) is formed with a curved surface (10-1a) to facilitate the induction of the fluid, the rear end is inclined toward the middle side so that the fluid guided to the passage can be discharged quickly It is preferable to form each inclined surface 10-1b.

In addition, the sound-absorbing housing may be made at least two or three or more divided and integrally manufactured by welding or the like, and may be connected and fixed to each other by a known fastener or connector.

As described above, according to the fourth embodiment of the present invention, the noise contained in the fluid passing through the flow path is introduced through the embossed perforations of the sound absorbing housing, that is, the noise is made through the embossed perforations formed with a wide outer diameter and a narrow inner diameter. Is smoothly introduced and then attenuated while being absorbed by the built-in sound absorbing material.

In addition, the noise introduced through the embossed perforations does not cancel in the sound absorbing material and cannot be radiated to the outside again, in order to minimize the emission through the embossed perforations as the inner diameter is narrower than the outer diameter due to the characteristics of the embossed perforations. In particular, it is possible to minimize the radiation back to the outside by the pocket space formed between the embossed perforations and embossed perforations.

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 radiated to the outside due to a phenomenon such as being trapped in the pocket space as the part where the inner diameter is located is formed wide. It can minimize the thing.

Accordingly, the noise introduced through the embossed perforations of the sound absorbing housing has a condition to maximize the noise reduction efficiency by canceling out as much as possible from the built-in sound absorbing material by minimizing radiation to the outside. In particular, the noise introduced through the embossed perforations by the pocket space formed between the embossed perforations and the embossed perforations minimizes that the noises are radiated to the outside again, so that the noises can be reduced more efficiently. do.

As a result, the sound absorbing module according to the fourth embodiment of the present invention also has a structural feature installed in the silencer to minimize noise emitted in the fluid passing through the flow path and radiated back to the outside, thereby reducing noise efficiency. Due to the conditions that can maximize the reliability of the muffler also has the advantage to increase as much as possible.

The present invention includes a silencer installed in each duct provided for air conditioning of various buildings, or an enclosure to cover the roadside so as not to interfere with the heat radiation of the soundproof wall or the engine and to radiate noise. It is used to reduce the noise.

Claims

A sound absorbing perforated plate formed with a plurality of embossed perforations so that the noise contained in the fluid is absorbed and is not emitted again through the absorbed portion.

The embossed perforation has a wide outer diameter on the side where the noise is introduced, the inner diameter of the side on which the noise is introduced is narrow, and each pocket space is formed so that the noise introduced between the embossed perforated and the embossed perforated is not emitted. Sound absorbing perforated plate comprising a.
The method of claim 1,

The outer diameter area of the embossed perforation is formed in more than 50% in proportion to the total area of the perforated plate, the inner diameter area is formed in less than 40% in proportion to the total area of the perforated plate, the outer diameter of the embossed perforated is Φ 3.5 ~ 25, an inner diameter of Φ 2 to 15, and a height between the outer diameter and the inner diameter of 0.8 to 10 mm.
The method of claim 1,

The pocket space is a sound absorbing perforated plate, characterized in that the space on the inner diameter side is wide, the opposite side outer diameter side is formed narrowly opposed to the embossed perforation.
A silencer including an inlet formed on one side of a housing to allow fluid containing noise to pass therethrough, a discharge opening formed on an opposite side of the inlet, and a flow path provided inside the housing between the inlet and the discharge opening,

A pocket perforated module having a front perforated plate having a plurality of embossed perforations formed on an open front side of the inlet side on the flow path, and the remaining surface being blocked and provided with a sound absorbing material therein; And

Silencer comprising a sound absorbing module, characterized in that it comprises a; each inner perforated plate is formed so that a plurality of embossed perforations are formed so that the sound absorbing material is interposed between the inner surface and the flow path of the housing.
The method of claim 4, wherein

The pocket type sound absorbing module further includes at least two or more pieces provided between the inlet and the discharge port, and the sound absorbing module further includes a wider area of the sound absorbing module disposed at the discharge port side than the sound absorbing module at the inlet side. Silencer comprising a sound absorbing module, characterized in that.
The method of claim 5,

The inner perforated plate on both sides of the inner surface of the inlet side is formed in at least two or more layers with a sound absorbing material interposed so that the passage area of the outlet side is wider than the flow path side of the inlet side, and the inner perforated plate on both sides of the inner surface of the outlet side Silencer comprising a sound absorbing module, characterized in that it further comprises being formed in a layer less than the inner perforated plate on the inlet side with the sound absorbing material therebetween.
The method of claim 4, wherein

The embossed perforated has a wider outer diameter of the side where the noise is introduced into the flow path, a narrower inner diameter of the side into which the noise is introduced, and the embossed type so that the noise introduced between the embossed perforated and the embossed perforated is not emitted. Silencer comprising a sound absorbing module, characterized in that it further comprises a pocket space of the inner side is wide, the opposite side outer diameter side is narrow to face the perforations.
The method of claim 5,

A sound absorbing module comprising a sound absorbing module, wherein a sound absorbing inner surface perforated plate is formed on the inner side of the sound absorbing module at predetermined intervals, and the sound absorbing material is interposed between the inner side of the sound absorbing module and the sound absorbing inner surface perforated plate.
The method of claim 8,

Silencer comprising a sound absorbing module, characterized in that it further comprises a plurality of partition plates formed with a plurality of embossed perforations between the sound absorbing material of the sound absorbing module at predetermined intervals.
The method of claim 8,

The sound absorbing module of the sound absorbing module further includes a sound absorbing module having at least one resonance space without a sound absorbing material formed between the sound absorbing material by at least one partition plate having a plurality of embossed perforations formed thereon. Silencer comprising a.
The method of claim 4, wherein

Silencer comprising a sound absorbing module, characterized in that the open front of the sound absorbing module further comprises an arc-shaped distribution mesh panel is provided so that the incoming noise is uniformly distributed.
Sound absorption module provided in the flow path of the silencer including an inlet formed on one side of the housing so that the fluid containing the noise, a discharge port formed on the opposite side of the inlet and a flow path provided in the housing between the inlet and the discharge opening as,

The sound absorption module is provided with a sound absorbing material therein;

Silencer comprising a sound absorbing module comprising a; sound absorbing housing comprising a plurality of embossed perforations are formed at a predetermined interval so that the sound is absorbed on the outer circumferential surface surrounding the sound absorbing material is not emitted to the outside again.
The method of claim 12,

The front end of the sound-absorbing housing is formed in a curved surface, the rear end is a silencer comprising a sound absorbing module, characterized in that formed by each inclined surface inclined toward the middle side.