CN214897604U

CN214897604U - Internal side type resonance structure and silencer composed of same

Info

Publication number: CN214897604U
Application number: CN202120721258.6U
Authority: CN
Inventors: 干灵锋; 张晓杰; 张芳
Original assignee: Zheng Sheng Environmental Technology Co ltd
Current assignee: Zheng Sheng Environmental Technology Co ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-11-26
Anticipated expiration: 2031-04-09

Abstract

The invention provides an internal side type resonance structure and a silencer composed of the same, wherein the internal side type resonance structure comprises a peripheral sealing plate, perforated plates on two sides and internal side type resonance plates, the internal side type resonance plates are at least one group, and the setting direction of the internal side type resonance plates is consistent with the sound propagation direction; three sides of each internal side type resonance plate are connected with the surrounding seal plates and form a closed structure together with the surrounding seal plates, and the other side of each internal side type resonance plate is not connected with the surrounding seal plates, so that an opening structure is formed in the internal side type resonance structure. The silencer comprising the internal side type resonance structure can better improve the low-frequency silencing effect while ensuring that the medium-frequency silencing effect meets the requirement; resistive sound absorption materials can be filled outside the inner side type resonance plate according to requirements, so that high-frequency and medium-frequency sound elimination effects are improved; in addition, the applicability of different noise elimination frequencies can be improved by adjusting the internal structure of the internal side type resonance structure.

Description

Internal side type resonance structure and silencer composed of same

Technical Field

The invention belongs to the technical field of silencers, and particularly relates to an internal side type resonance structure with good low-frequency silencing effect and medium-frequency silencing effect meeting requirements and a silencer formed by the internal side type resonance structure.

Background

In the prior art, common muffling devices can be roughly classified into resistive mufflers, impedance composite mufflers and the like according to different muffling principles and structures of the muffling devices, wherein the resistive mufflers are most applied to practical engineering ventilation and noise reduction systems, and the resistive mufflers have the advantages of good medium-frequency muffling performance and wide medium-frequency muffling frequency band. The resistive muffler is generally divided into a matrix muffler and a sheet muffler according to different structures, the main structure of the resistive muffler is a metal orifice plate, resistive sound-absorbing materials such as glass wool and the like are filled in the orifice plate, and the muffling principle is that sound energy is converted into heat energy due to friction and dissipated when sound waves are transmitted in the resistive sound-absorbing materials, so that the purpose of muffling is achieved.

The installation of the resistive muffler is very common in the application of practical engineering, the resistive muffler achieves the purpose of muffling by filling fiber porous sound-absorbing materials such as glass wool and the like in an outer orifice plate at present, because of the sound absorption characteristic of good high-frequency sound absorption performance in resistive materials such as porous sound absorption materials and the like, the typical sound attenuation characteristic of the silencer is good medium-frequency sound attenuation performance, but is limited by the characteristic of small low-frequency sound absorption of the resistive sound absorption material, the low-frequency noise elimination performance of the resistive muffler is weaker and is far lower than the medium-frequency noise elimination quantity, although the low-frequency performance can be increased to a certain extent by increasing the length of the silencer and increasing the thickness of the sheet to reduce the through-flow rate, the improvement effect is not obvious, the economic cost is higher, the resistance coefficient of the silencer is larger, in actual use, for noise sources with prominent low frequencies, the noise reduction of the existing resistive muffler is difficult to meet the requirements. In addition, the damping performance of the resistive silencer can be obviously reduced at higher frequency, and the high-frequency damping performance is poor. Therefore, the existing resistive muffler has the conditions of insufficient low-frequency and high-frequency muffling and excessive medium-frequency muffling in the actual use process.

Reactive mufflers utilize the change of the muffler structure to realize the muffling and noise reduction, but for the muffling of lower frequencies, the mufflers need larger volume, and the muffling frequency band of the mufflers is narrower, and the mufflers can only reduce noise of certain specific frequencies, so the application of the reactive mufflers in practical use is greatly limited.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides an internal side type resonance structure which has good low-frequency and high-frequency noise elimination effects and meets the requirements on medium-frequency noise elimination effect, and a silencer composed of the internal side type resonance structure.

The invention is realized by the following technical scheme: an internal side type resonance structure comprises a peripheral sealing plate, perforated plates on two sides and internal side type resonance plates, wherein the internal side type resonance plates are at least one group, each group at least comprises two internal side type resonance plates, the internal side type resonance plates are arranged in parallel, and the arrangement direction of the internal side type resonance plates is consistent with the sound propagation direction; three sides of each internal side type resonance plate are connected with the peripheral sealing plates and form a closed structure together with the peripheral sealing plates, and the other side of each internal side type resonance plate is not connected with the peripheral sealing plates, so that an opening structure is formed in the internal side type resonance structure; the inner side type resonance plate is a hard plate.

Alternatively, the inner-side resonance plate may be disposed at the left side of the inner-side resonance structure, may be disposed at the right side of the inner-side resonance structure, or may be disposed at both the left and right sides; the length of the inner side type resonance plate at the left and/or right side and the width of the cavity may be the same or different.

Further, the hard plate can be one of a metal plate, a wood plate, a plastic plate and a cement plate.

Further, the two-sided perforated plate may be one of a metal perforated plate, a wooden perforated plate, and a gypsum perforated plate. The perforation rate of the perforated plates on the two sides is more than 15%, and the aperture is more than 1 mm.

The length of the inner side resonator plate is L1, the length of the inner side resonator plate is L1 with an upper limit of 4m, preferably 3m, 2m, 1m, 0.5m, 0.2m, the length of the inner side resonator plate is L1 with a lower limit of 0.1m, preferably 0.2m, 0.4m, 0.6m, 0.8m, 1m, 1.5m, 2m, the length of the inner side resonator plate L1 determines the resonance frequency, i.e., L1 corresponds to n/4 wavelength of the resonance frequency, L1= λ n/4, where λ is wavelength, n is odd number, λ = c ⁄ f, where c is the propagation velocity of the sound wave in the air, and f is the resonance frequency at about 340m/s under the conditions of normal atmospheric pressure and 15 ℃, and thus, the resonance frequency corresponding to the inner side resonator plate L1 is: f = c × n/(4 × L1), and when n =1, corresponds to the lowest resonance muffling frequency of the structure.

For example, when the inner side type resonator plate L1=0.5m, the lowest resonance frequency is f = c/(4 × L1) = 340/(0.5 × 4) = 170Hz, and this structure has a noise cancellation peak near a low frequency of 170 Hz.

Between parallel arrangement's the inside lateral resonance board, form the cavity, the width of cavity is d1, the width d1 upper limit of cavity is 400mm, preferably 300mm, 250mm, 200mm, 150mm, 100mm, the width d1 lower limit of cavity is 10mm, preferably 20mm, 40mm, 80mm, 100mm, 150mm, 200mm, the width of cavity decides the size that resonant frequency corresponds the noise elimination peak value, and d1 is bigger, and the noise elimination peak value is bigger.

By designing the L1 and the d1 which are matched with each other, a specific silencing structure for noises with different frequencies can be obtained.

Optionally, a resistive sound absorbing material is filled outside the inner side type resonator plate, and the upper limit of the width d2 of the resistive sound absorbing material is 200mm, more preferably 150mm, or 100mm, or 50 mm; the lower limit of the width d2 of the resistive sound absorbing material is 5mm, more preferably 10mm, or 20mm, or 50 mm.

The invention also provides another technical scheme, which specifically comprises the following steps: a muffler comprising the above-described inside-side resonance structure, which may be one or more sections; when the internal side resonance structure is a plurality of stages, the plurality of stages of internal side resonance structures are connected in sequence, and the internal side resonance structures of the respective stages may be the same or different. When the multiple sections of internal side type resonance structures are connected in sequence, the noise elimination effect can be further adjusted and improved.

Further, the internal side type resonance structure is two, three or four sections.

The invention has the beneficial effects that: the present invention and the prior art use vibrating plates such as CN2020106263650, or the sound absorption material such as CN201320705567X is filled outside the resonance plate to eliminate the noise, the vibration plate of the former is only fixed with the sealing plate by one side edge and utilizes the vibration of the vibration plate to assist in eliminating the noise, the resonance plate of the latter is not connected with the surrounding sealing plate, the invention adopts the structure that three sides are contacted and fixed with the sealing plate, and particularly, the silencing principle of the invention is that a group of resonance plates are utilized, or the closed cavity formed between a plurality of groups of resonance plates realizes noise elimination, when sound waves are incident, the low-frequency sound wave length is longer, and the energy is consumed by the vibration of the sound waves diffracted into the cavity, so the low-frequency noise reduction performance is better, of course, the structure and effect of the sound absorbing pipe with different length in the prior art, such as CN2019109046376, are also different, and further, the direction of the internal side resonance plate is the same as the sound propagation direction, and the internal side resonance structure has practical significance for low-frequency noise elimination. Overall, compared to the prior art, the following advantages are provided:

1) compared with the existing resistive ventilation silencer, the internal side type resonance structure is arranged, so that the low-frequency silencing performance can be effectively improved, the low-frequency performance is better, and the medium-frequency silencing performance can meet the requirements.

2) Through optionally filling resistive sound absorbing material in the internal side formula resonance structure, high frequency and medium frequency noise elimination effect can also be further promoted.

3) For different noise sources, through the design of the internal structure of the silencer, such as adjusting the number of groups of internal side type resonance structures in the silencer, or using the internal side type resonance structures with different structures in the same silencer, or adjusting and matching the length L1, the cavity width d1, the width d2 of a resistive sound absorption material and the like of the internal side type resonance plate in the internal side type resonance structure, the different noise elimination requirements are subjected to customized design, the use in different scenes is met, and the applicability of the silencer is greatly improved.

Drawings

FIG. 1 is a schematic diagram of an internal side resonance structure;

FIG. 2 is a schematic view of a set of internal side resonator plates disposed within an internal side resonator structure;

FIG. 3 is a schematic diagram of two sets of internal side resonator plates disposed within an internal side resonator structure;

FIG. 4 is a schematic view of an inside side resonator plate with an outside filled resistive sound absorbing material;

FIG. 5 is a schematic diagram of a muffler comprising three internal side resonant structures;

fig. 6 is a test result of a muffler composed of three-stage internal side type resonance structures.

In the figure: 1-surrounding closing plate, 2-two side perforated plates, 3-internal side type resonance plate, 3' -internal side type resonance plate and 4-resistive sound absorption material.

Detailed Description

As shown in fig. 1-2, an internal side resonance structure includes a peripheral sealing plate 1, two side perforated plates 2, and internal side resonance plates 3, wherein the internal side resonance plates are a group including 2 internal side resonance plates opposite to each other, and the arrangement direction is consistent with the sound propagation direction; three sides of each internal side type resonance plate 3 are connected with the peripheral sealing plates 1 and form a closed structure together with the peripheral sealing plates 1, and the other side of each internal side type resonance plate 3 is not connected with the peripheral sealing plates 1, so that an opening structure is formed in the internal side type resonance structure; the inner side type resonance plate 3 is a hard plate; wherein, inside side formula resonator plate length is L1, between the inside side formula resonator plate of parallel arrangement, form the cavity, the width of cavity is d 1.

As shown in fig. 3, further includes a second set of inner side resonator plates 3'.

As shown in fig. 4, further comprising a resistive sound absorbing material 4 disposed outside the inner side type resonator plate, the resistive sound absorbing material 4 having a width d 2.

As shown in fig. 5, a muffler is composed of three sections of internal side resonance structures, a group of internal side resonance plates are arranged in the first section of internal side resonance structure, two groups of internal side resonance plates are respectively arranged in the last two sections of internal side resonance structures, resistive sound absorbing materials are filled outside the internal side resonance plates, the internal side resonance plates are made of steel plates, the surrounding sealing plates are made of steel plates, the perforated plates on two sides are made of metal perforated plates, and the resistive sound absorbing materials are made of glass wool; the length of the internal side type resonance plate is set to be different so as to widen the low-frequency silencing frequency band, the length of the silencer is 3m, the length of each section of internal side type resonance structure is 1m, and the flow rate of the silencer is 50%; wherein, the length L1 of the internal side type resonance plate in the first section of internal side type resonance structure is 0.9m, the width d1 of the cavity is 150mm, and the width d2 of the resistive sound absorption material is 25 mm; in the second section of internal side type resonance structure, the length L1 of the internal side type resonance plate is 0.45m, the length L1' is 0.45m, the width d1 of the cavity is 150mm, and the width d2 of the resistive sound absorption material is 25 mm; in the third section of internal side type resonance structure, the length L1 of the internal side type resonance plate is 0.55m, the length L1' is 0.28m, the width d1 of the cavity is 100mm, and the width d2 of the resistive sound absorption material is 50 mm; the perforation rate of the perforated plates on both sides was 23% and the pore diameter was 3 mm.

Fig. 6 shows comparison data of laboratory test results of the above muffler of the present invention with a sheet muffler in the prior art, in which a main body structure of the muffler is a surface metal orifice plate, and a glass wool resistive sound absorbing material is filled in the orifice plate, under the same test conditions. According to the test result, the intermediate frequency is reduced to a certain extent compared with the sheet type silencer in the prior art, because the use of the resistive sound absorption material is reduced in the internal side type resonance silencer, the reduction amount is 66.7%, the use amount of the resistive sound absorption material is reduced, and because the existing resistive silencer has a waste phenomenon in the intermediate frequency sound absorption amount; the silencer of the invention has improved silencing performance below 200Hz at low frequency, the lifting amount of certain frequency ranges is more than 5dB, and the 5dB performance improvement has great practical significance for low-frequency silencing because the low-frequency performance is difficult to improve. In addition, because a small amount of resistive sound absorption material is filled, the performance of the silencer in a high-frequency range is improved, if the using amount of the resistive sound absorption material is increased, the medium frequency of the silencer is correspondingly improved, and the performance of the silencer is superior to that of the existing sheet type silencer.

Claims

1. An internal side type resonance structure is characterized by comprising a peripheral sealing plate, perforated plates on two sides and internal side type resonance plates, wherein the internal side type resonance plates are in one group or multiple groups, and the setting direction of the internal side type resonance plates is consistent with the sound propagation direction; three sides of each internal side type resonance plate are fixedly connected with the peripheral sealing plates, and the other side of each internal side type resonance plate is not connected with the peripheral sealing plates, so that an opening structure is formed in the internal side type resonance structure; wherein the inner side resonator plate has a length of L1; between the inner side type resonance plates, a cavity is formed, and the width of the cavity is d 1.

2. The inner-side resonance structure as recited in claim 1, wherein said inner-side resonance plate is a hard plate.

3. The inner-side resonance structure as claimed in claim 1, wherein the length L1 of the inner-side resonance plate is 4m or less, and the width d1 of the cavity is 400mm or less.

4. The internal side resonance structure as recited in claim 2, wherein the hard plate is one of a metal plate, a wood plate, a plastic plate, and a cement plate.

5. An internal side resonance structure as claimed in any one of claims 1 to 4, wherein said two-sided perforated plate is one of a metal perforated plate, a wooden perforated plate and a gypsum perforated plate.

6. The internal side resonance structure as claimed in claim 5, wherein said perforated plates have a perforation rate of more than 15% and a hole diameter of more than 1 mm.

7. The on-side resonance structure as claimed in any one of claims 1 to 4 and 6, wherein the inside-side resonance panel is filled with a resistive sound absorbing material having a width d2 and a width d2 of 200mm or less.

8. An inner-side resonance structure according to any one of claims 1 to 4 and 6, wherein the inner-side resonance plate is provided on the left side of the inner-side resonance structure, or on the right side of the inner-side resonance structure, or on both the left and right sides.

9. The inside-side resonance structure as claimed in claim 8, wherein the length of the inside-side resonance plate on the left and/or right side and the width of the cavity are the same or different.

10. A muffler comprising an inside-side resonance structure as recited in any one of claims 1 to 9, wherein the inside-side resonance structure may have one or more sections; when the inner-side resonant structure is a plurality of sections, the plurality of sections of inner-side resonant structures are connected in sequence, and the inner-side resonant structures of the sections are the same or different.

11. The muffler of claim 10, wherein the internal side resonant structure is two, three or four sections.