Novel metal micropore acoustic metamaterial silencer

Abstract

The utility model discloses a novel metal micropore acoustic metamaterial silencer which comprises a silencer shell, an ultra-micropore connecting plate is arranged on the inner side of the silencer shell, and a plurality of sound absorbers are detachably arranged on the inner side of the ultra-micropore connecting plate at intervals. The sound absorber is a rectangular ultra-micropore cavity silencing sheet with a cavity layer or a V-shaped ultra-micropore cavity silencing sheet with a cavity layer, and flanges are arranged on the periphery of the outer side of the silencer shell. The novel metal micropore acoustic metamaterial silencer is wide in sound absorption frequency band and good in noise reduction effect, the average sound absorption coefficient within the frequency range of 160-2000 HZ is larger than 0.75 or above, compared with a traditional silencer, the ventilation rate is improved by 30%, the internal flow speed and resistance are greatly reduced, the noise reduction and silencing effect and the economic benefit of equipment are greatly improved, and the novel metal micropore acoustic metamaterial silencer is suitable for popularization and application. And on the premise of ensuring the optimal sound absorption and noise reduction efficiency, the product manufacturing cost is low, the practical value is obviously improved, and large-area popularization and application are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ventilation muffler technical field, specifically a new type metal microporous acoustic metamaterial muffler. BACKGROUND

[0002] The development and application of the ventilation muffler have achieved a relatively ideal effect, and the currently used mufflers mainly include a resistance muffler and a resistance absorption muffler series, especially the resistance muffler series. The resistance muffler series mainly utilizes the change of a section to mute. However, the resistance muffler has a limited sound elimination frequency band, and usually has a good sound elimination effect on a specific frequency band, and cannot have a good sound elimination effect in a wide frequency range.

[0003] The resistance absorption type muffler series utilizes the fact that when sound waves propagate in a porous sound absorption material, sound energy is converted into heat energy due to friction and is dissipated, so as to achieve the purpose of sound elimination. The sound elimination performance of the material is similar to the resistance loss of electric power in an electric circuit, and the resistance muffler has good medium and high frequency sound elimination performance, but poor low frequency sound elimination performance. The sound elimination amount of the muffler greatly varies with the structure of the muffler. Moreover, the sound elimination material in the ordinary resistance muffler is generally organic glass wool, which will age and volatilize for a long time, and will cause noise pollution to the environment. The ordinary resistance muffler is not suitable for some clean rooms with high requirements, and is also not suitable for high temperature, high humidity and high speed conditions. SUMMARY

[0004] The utility model discloses a new type metal microporous acoustic metamaterial muffler, which is arranged by calculating and combining the sound absorption body of the muffler, can effectively improve the sound absorption coefficient of the muffler to low frequency, improve the sound elimination capacity of the overall frequency band of the muffler, improve the ventilation effective area of the muffler, reduce the ventilation wind speed, reduce the equipment resistance, reduce the secondary airflow noise, and improve the comprehensive noise reduction effect of the muffler.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new type metal microporous acoustic metamaterial muffler, which comprises a muffler shell, an ultramicroporous connecting plate is arranged on the inner side of the muffler shell, a plurality of sound absorption bodies are detachably and spacedly arranged on the inner side of the ultramicroporous connecting plate, the sound absorption body is a rectangular ultramicroporous cavity sound absorption sheet or a V-shaped ultramicroporous cavity sound absorption sheet with a cavity layer, and a flange is arranged on the outer side of the muffler shell.

[0006] In a preferred embodiment, the rectangular ultramicroporous cavity sound absorption sheet comprises an ultramicroporous sound absorption hole plate A with a cavity layer and in a rectangular shape, and a sound absorption sheet keel A arranged on both sides of the inner cavity of the ultramicroporous sound absorption hole plate A, and a flow guide angle A is arranged at both ends of the ultramicroporous sound absorption hole plate A.

[0007] In a preferred embodiment, the rectangular ultra-microporous cavity sound-absorbing sheet is arranged in an inclined manner inside the ultra-microporous connecting plate.

[0008] In a preferred embodiment, the V-shaped ultra-microporous cavity sound-absorbing sheet comprises a V-shaped ultra-microporous sound-absorbing hole plate B with a cavity layer and a sound-absorbing sheet keel B arranged on both sides of the inner cavity of the ultra-microporous sound-absorbing hole plate B, and both ends of the ultra-microporous sound-absorbing hole plate B are provided with a flow guide angle B.

[0009] In a preferred embodiment, the tip of the V-shaped ultra-microporous cavity sound-absorbing sheet is arranged vertically upward.

[0010] In a preferred embodiment, the material of the ultra-microporous connecting plate, the rectangular ultra-microporous cavity sound-absorbing sheet and the V-shaped ultra-microporous cavity sound-absorbing sheet is one of an aluminum plate, a galvanized plate or a stainless steel plate.

[0011] In a preferred embodiment, the thickness of the plate of the rectangular ultra-microporous cavity sound-absorbing sheet and the V-shaped ultra-microporous cavity sound-absorbing sheet 5 is 0.2-2mm, the perforation rate is 0.5-1.5%, and the hole diameter is 0.1-0.5mm.

[0012] In a preferred embodiment, the spacing between the sound-absorbing bodies can be arranged in different spacings, such as 20-60mm, 40-200mm, 200-800mm, etc., which can effectively increase the sound absorption coefficient of each frequency band in the range of 160-4000HZ, thereby improving the overall sound absorption of the sound absorber.

[0013] In a preferred embodiment, the sound-absorbing body is combined through the ultra-microporous sound-absorbing hole plate and the intermediate cavity layer structure.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The sound absorption frequency bandwidth is good, and the average sound absorption coefficient in the frequency range of 160-2000HZ is greater than 0.75;

[0016] 2. The structure is simple, the manufacturing is convenient, the assembly is simple, the material is environmentally friendly, the use performance is stable and reliable, there is no pollutant, and it is especially suitable for use in a ventilation system that needs to be purified;

[0017] 3. On the premise of ensuring the optimal sound absorption and noise reduction effect, the product manufacturing cost is low, the practical value is obviously improved, and it is beneficial to large-area popularization and application;

[0018] 4. Compared with the traditional sound absorber, the ventilation rate is increased by 30%, the internal flow rate and resistance are greatly reduced, and the effect on the noise reduction and sound absorption and the economic benefit of the equipment is great;

[0019] 5、 The product of the utility model has more material selection types, and can be widely applied to various places requiring sound elimination. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure schematic view of the sound eliminator composed of the rectangular super-micropore cavity sound elimination sheet of the utility model.

[0021] Figure 2 It is a three-dimensional structure schematic view of the rectangular super-micropore cavity sound elimination sheet. Figure 1

[0022] It is a whole structure schematic view of the sound eliminator composed of the V-shaped super-micropore cavity sound elimination sheet of the utility model. Figure 3

[0023] It is a three-dimensional structure schematic view of the V-shaped super-micropore cavity sound elimination sheet. Figure 4 Figure 3

[0024] In the drawing: 1, rectangular super-micropore cavity sound elimination sheet; 101, sound elimination sheet keel A; 102, super-micropore sound absorption hole plate A; 103, flow guide angle A; 2, flange; 3, sound eliminator shell; 4, super-micropore connecting plate; 5, V-shaped super-micropore cavity sound elimination sheet; 501, sound elimination sheet keel B; 502, super-micropore sound absorption hole plate B; 503, flow guide angle B. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail in combination with the drawings.

[0026] The embodiment is only an explanation of the utility model, and is not a limitation of the utility model. Those skilled in the art can make creative contributions to the embodiment according to the needs after reading the description, but as long as the embodiment is within the scope of the claims of the utility model, it is protected by the patent law.

[0027] The utility model discloses a novel metal micropore acoustic metamaterial sound eliminator, which solves the technical problems in the prior art, and the general idea is as follows:

[0028] The novel metal micropore acoustic metamaterial sound eliminator is installed in a horizontal or vertical form, and is mainly installed at an air inlet, an air outlet and a middle part of a flue of a fan pipeline. The super-micropore sound eliminator is connected with a flange and an original flue flange at two ends, and the whole installation and combination form is relatively simple. The material can be selected from an aluminum plate, a galvanized plate and a stainless steel plate. The overall fireproof grade is A grade. The thickness of the plate is 0.2-2 mm, the perforation rate is 0.5-1.5%, and the hole diameter is 0.1-0.5 mm.

[0029] ​​The super-microporous sound absorption hole plate can be arranged at different intervals, such as 20-60 mm, 40-200 mm, 200-800 mm, etc. The sound absorption coefficient of each frequency band in the range of 160-4000 Hz can be effectively increased, so that the overall sound absorption of the muffler is improved, and the muffler is suitable for various industrial and civil fan pipeline noise.

[0030] Example 1

[0031] Taking the noise reduction of the air inlet of a fan as an example, the combination of Figure 1 and Figure 2 is described. The rectangular super-microporous cavity sound absorption sheet 1 in the muffler is made of super-microporous 304 stainless steel plate, the sound absorption sheet keel A101 is made of 1.0 mm thick stainless steel plate, the super-microporous sound absorption hole plate A102 is made of 0.4 mm thick stainless steel super-microporous plate, and the flow guide angle A103 is made of 0.4 mm thick stainless steel super-microporous plate.

[0032] The muffler shell 3 is made of 1.2 mm thick 304 stainless steel plate, the total thickness of the rectangular super-microporous cavity sound absorption sheet 1 is 40 mm, the perforation rate is 1.3%, the hole diameter is 0.4 mm, the super-microporous connecting plate 4 is made of 1.2 mm thick stainless steel super-microporous plate, and the flange 2 is L40*4 mm stainless steel angle steel.

[0033] The super-microporous connecting plate 4 is fixed to the inner side of the muffler shell 3, the rectangular super-microporous cavity sound absorption sheet 1 is installed on the inner side of the super-microporous connecting plate 4, and the flange 2 is connected with the outer side of the muffler shell 3.

[0034] The rectangular super-microporous cavity sound absorption sheet 1 is arranged at the same interval in the muffler, the interval is 40 mm, the thickness of the muffler is 150 mm, the average sound absorption coefficient of the muffler in the range of 400-2000 Hz is 0.85, the ventilation rate is 65%, and the muffler is installed in a horizontal manner. While ensuring the ventilation volume, the noise at the air inlet of the fan is reduced, which greatly protects the overall environment around the fan.

[0035] Example 2

[0036] Taking the noise reduction of the air inlet of a nuclear power fan as an example, the combination of Figure 3 and Figure 4 is described. The V-shaped super-microporous cavity sound absorption sheet in the muffler is made of super-microporous 304 stainless steel plate, the sound absorption sheet keel B501 is made of 1.0 mm thick stainless steel plate, the super-microporous sound absorption hole plate B502 is made of 0.4 mm thick stainless steel super-microporous plate, and the flow guide angle B503 is made of 0.4 mm thick stainless steel super-microporous plate.

[0037] The silencer has a cross-sectional area of ​​1400*1000mm (length*height) and a total thickness of 150mm. The silencer housing 3 is made of 1.2mm thick 304 stainless steel plate. The V-shaped micro-perforated cavity silencing plate 5 has a total thickness of 60mm, a perforation rate of 1.35%, and a hole diameter of 0.4mm. The micro-perforated connecting plate 4 is made of 1.2mm thick stainless steel micro-perforated plate. The flange 2 is made of L40*4mm stainless steel angle steel.

[0038] The micro-perforated connecting plate 4 is fixed inside the muffler housing 3, the V-shaped micro-perforated cavity sound-absorbing plate 5 is installed in the micro-perforated connecting plate 4, and the flange 2 is connected to the outer periphery of the muffler housing 3.

[0039] The V-shaped microporous cavity sound-absorbing plates 5 are arranged at equal intervals of 40mm within the silencer. The overall silencer has an average sound absorption coefficient of 0.80 across all frequency bands in the 350–2000Hz range. The silencer is horizontally installed. After installation, the overall effective noise reduction of the silencer is approximately 15dB(A). In areas with limited space, this silencer can greatly ensure ventilation, achieving a ventilation rate of 55%, and can improve the sound absorption coefficient across all frequency bands, thus producing a good noise reduction effect.

[0040] Example 3

[0041] Take noise reduction in a ventilation duct as an example. Combined with... Figure 1 and Figure 2 To explain, the rectangular micro-perforated cavity sound-absorbing plate 1 inside the muffler is made of micro-perforated aluminum alloy plate, the sound-absorbing plate keel A101 is made of aluminum alloy plate with a thickness of 1.0mm, the micro-perforated sound-absorbing plate A102 is made of aluminum alloy micro-perforated plate with a thickness of 0.4mm, and the guide angle A103 is made of aluminum alloy micro-perforated plate with a thickness of 0.4mm.

[0042] The silencer has a cross-sectional area of ​​1500*1500mm (length*height) and a total thickness of 500mm. It is made of aluminum alloy plate. The silencer shell 3 has a plate thickness of 1.2mm. The rectangular micro-perforated cavity sound-absorbing plate 1 has a total thickness of 80mm, with perforation rates of 2.0% and 1.5% and a hole diameter of 0.3mm. The micro-perforated connecting plate 4 is made of 1.2mm thick aluminum alloy micro-perforated plate. The flange 2 is made of L40*4mm aluminum alloy angle steel.

[0043] The rectangular ultra-microporous cavity sound-absorbing sheet 1 is arranged in the sound absorber at different intervals, mainly 40mm and 80mm interval combination, the average sound absorption coefficient of the sound absorber in each frequency band in the range of 300-2000HZ is 0.80, the sound absorber adopts horizontal installation form, and the ventilation area is more than 50%. After installation, the overall effective noise reduction of the sound absorber is about 20dB(A). The sound absorber can greatly ensure the ventilation volume in the area with limited space, and can improve the sound absorption coefficient of each frequency band, thereby producing good noise reduction effect.

[0044] The above description of the embodiments is for the purpose of facilitating the understanding and use of the present application by those skilled in the art, and those skilled in the art can easily make various modifications to the embodiments, and apply the general principles described herein to other embodiments without creative labor, therefore, the present application is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present application should be within the protection scope of the present application.

Claims

1. A novel metallic microporous acoustic metamaterial silencer, characterized by: The muffler shell (3) is provided with an ultramicro hole connecting plate (4) on the inner side, and a plurality of sound absorbing bodies are detachably arranged on the inner side of the ultramicro hole connecting plate (4) in intervals, wherein the sound absorbing bodies are rectangular ultramicro hole cavity sound absorbing sheets (1) or V-shaped ultramicro hole cavity sound absorbing sheets (5) provided with a cavity layer.

2. A novel metallic microporous acoustic metamaterial silencer according to claim 1, characterized in that: The outer side of the muffler shell (3) is provided with a flange (2) around.

3. A novel metallic microporous acoustic metamaterial silencer according to claim 2, characterized in that: The rectangular ultramicro hole cavity sound absorbing sheet (1) comprises an ultramicro hole sound absorbing hole plate A (102) provided with a cavity layer and in a rectangular shape, and a sound absorbing sheet keel A (101) arranged on both sides of the inner cavity of the ultramicro hole sound absorbing hole plate A (102), wherein both ends of the ultramicro hole sound absorbing hole plate A (102) are provided with a flow guide angle A (103).

4. A novel metallic microporous acoustic metamaterial silencer according to claim 3, characterized in that: The rectangular ultramicro hole cavity sound absorbing sheet (1) is arranged obliquely in the inner side of the ultramicro hole connecting plate (4).

5. A novel metallic microporous acoustic metamaterial silencer according to claim 2, characterized in that: The V-shaped ultramicro hole cavity sound absorbing sheet (5) comprises a V-shaped ultramicro hole sound absorbing hole plate B (502) provided with a cavity layer and in a V-shaped form, and a sound absorbing sheet keel B (501) arranged on both sides of the inner cavity of the ultramicro hole sound absorbing hole plate B (502), wherein both ends of the ultramicro hole sound absorbing hole plate B (502) are provided with a flow guide angle B (503).

6. A novel metallic microporous acoustic metamaterial silencer according to claim 5, characterized in that: The tip of the V-shaped ultramicro hole cavity sound absorbing sheet (5) is arranged vertically upward.

7. A novel metallic microporous acoustic metamaterial silencer according to any one of claims 1-6, characterized in that: The material of the ultramicro hole connecting plate (4), the rectangular ultramicro hole cavity sound absorbing sheet (1) and the V-shaped ultramicro hole cavity sound absorbing sheet (5) is one of an aluminum plate, a galvanized plate or a stainless steel plate.

8. A novel metallic microporous acoustic metamaterial silencer according to claim 7, characterized in that: The thickness of the plate of the rectangular ultramicro hole cavity sound absorbing sheet (1) and the V-shaped ultramicro hole cavity sound absorbing sheet (5) is 0.2-2mm, the perforation rate is 0.5-1.5%, and the hole diameter is 0.1-0.5mm.

9. A novel metallic microporous acoustic metamaterial silencer according to claim 8, characterized in that: The spacing between the plurality of sound absorbing bodies can be arranged in different spacings.

10. A novel metallic microporous acoustic metamaterial silencer according to claim 9, characterized in that: The sound absorbing bodies are combined through the ultramicro hole sound absorbing hole plate and the intermediate cavity layer structure.

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