Wide-frequency-band airflow noise muffling device

Abstract

The utility model discloses a wide-frequency-band airflow noise muffling device which comprises an air inlet end. The air inlet end is connected with a diffusion section, the diffusion section is connected with a muffling section, the muffling section is connected with a flow guide section, and the flow guide section is connected with an air outlet end. Sound absorption layers are installed on the two sides of the interior of the silencing section, the sound absorption layers are arranged at the output end of the diffusion section, a resonance sleeve is arranged on the side, close to the flow guide section, of the silencing section, and a plurality of resonance cavities are formed in the resonance sleeve. According to the utility model, effective coverage and reduction of wide-frequency-band noise are realized, medium-high-frequency airflow noise in a ventilation system and low-frequency noise in exhaust of an engine can be remarkably suppressed, strict requirements of different occasions on noise control are met, the overall structural design is simple and clear, and the cost is low. The functions of all the components are clear and easy to achieve, the simple structure is convenient to machine and assemble in the manufacturing process, and the operation difficulty and cost can be reduced in the later maintenance and overhaul process.

Description

Technical Field

[0001] This utility model belongs to the field of noise control technology, specifically relating to a wideband airflow noise silencing device. Background Technology

[0002] In modern industrial production and various building facilities, such as ventilation systems, engine exhaust systems, and industrial pipelines, a significant amount of airflow noise is generated during operation. This noise not only pollutes the surrounding environment and affects people's work and living comfort, but may also adversely affect the operational stability and service life of the equipment itself.

[0003] Traditional silencing louvers have certain limitations in noise reduction, especially in controlling broadband noise, which makes it difficult to meet increasingly stringent environmental protection and usage requirements. Therefore, developing a silencing device that can efficiently reduce broadband airflow noise, has a simple structure, and is easy to maintain is of great practical significance. Utility Model Content

[0004] In view of the problems mentioned above in the background art, the purpose of this utility model is to provide a wide-band airflow noise silencing device.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A broadband airflow noise silencing device includes an air inlet, a diffuser connected to the air inlet, a silencer connected to the diffuser, a flow guide connected to the silencer, and an air outlet connected to the flow guide.

[0007] The sound-absorbing layer is installed on both sides of the inside of the silencing section. The sound-absorbing layer is located at the output end of the diffusion section. The silencing section has a resonant sleeve on the side near the flow guide section. The resonant sleeve has several resonant cavities inside.

[0008] Furthermore, the air intake end is configured as a tapered pipe structure. This structural design facilitates the guidance of airflow.

[0009] Furthermore, the diffuser section is configured as a gradually expanding pipe structure. This structural design reduces the airflow velocity.

[0010] Furthermore, the sound-absorbing layer is made of glass wool and foamed metal. This structural design can cover mid-to-high frequency noise.

[0011] Furthermore, the resonant cavity has different sizes. This structural design can cover low-frequency noise.

[0012] Furthermore, the outlet end is configured as a tapered pipe structure. This structural design facilitates the guidance of the treated airflow.

[0013] The beneficial effects of this utility model are as follows: By using a combination of sound-absorbing layer, resonant sleeve, and resonant cavity, this utility model effectively covers and reduces a wide range of noise by absorbing mid-to-high frequency noise and by using the resonant cavity to absorb low-frequency noise. Whether it is mid-to-high frequency airflow noise in the ventilation system or low-frequency noise in engine exhaust, it can be significantly suppressed, effectively improving the acoustic quality of the surrounding environment, enhancing environmental comfort, and meeting the strict requirements for noise control in different occasions. The overall structural design of this utility model is simple and clear, and the functions of each component are clear and easy to implement. This simple structure not only facilitates processing and assembly during the manufacturing process, but also reduces the difficulty and cost of operation during later maintenance and repair. Attached Figure Description

[0014] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0015] Figure 1 This is a schematic diagram of the axial structure of a broadband airflow noise silencing device according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of a broadband airflow noise silencing device according to an embodiment of the present invention.

[0017] Figure 3 This is a horizontal cross-sectional structural diagram of a broadband airflow noise silencing device according to an embodiment of the present invention;

[0018] The symbols for the main components are explained below:

[0019] 1. Inlet section; 2. Diffuser section; 3. Silencing section; 4. Guide section; 5. Outlet section; 6. Sound-absorbing layer; 7. Resonance sleeve; 8. Resonance cavity. Detailed Implementation

[0020] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1, such as Figure 1 and Figure 2 As shown, a wideband airflow noise silencing device has an air inlet 1 connected to a diffuser section 2, a silencing section 3 connected to the diffuser section 2, a flow guide section 4 connected to the flow guide section 4, and an air outlet 5 connected to the flow guide section 4.

[0022] The sound-absorbing layer 6 is installed on both sides of the interior of the silencing section 3. The sound-absorbing layer 6 is located at the output end of the diffusion section 2. The silencing section 3 has a resonance sleeve 7 on the side near the flow guide section 4. The resonance sleeve 7 has several resonance cavities 8 inside.

[0023] In this embodiment, during installation, ensure that the air inlet 1 is tightly connected to the airflow duct that needs noise reduction, so that the airflow can smoothly enter the air inlet 1. At the same time, pay attention to sealing to prevent airflow leakage and additional noise. After the airflow passes through the air inlet 1 and enters the diffuser section 2, the airflow speed is reduced to reduce turbulence noise. Then it enters the silencing section 3, where the sound-absorbing layer 6 in the silencing section 3 comes into full contact with the mid-to-high frequency noise in the airflow, thereby absorbing the mid-to-high frequency noise. Then, it absorbs the low-frequency noise through the resonant cavity 8 in the resonant sleeve 7. Finally, the treated airflow is guided out of the device through the guide section 4 and the air outlet 5, thereby achieving the effect of reducing noise generation.

[0024] Example 2, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure to the embodiment 1: the air inlet 1 is set as a tapered pipe structure.

[0025] In this embodiment, the air inlet 1 adopts a tapered pipe design. The tapered pipe can guide the airflow smoothly into the device. By reasonably reducing the pipe diameter, the impact generated when the airflow enters the device is effectively reduced, and the noise caused by the airflow impact is reduced.

[0026] Among them, the air intake end 1 is made of a suitable metal material and is processed into a tapered pipe shape according to the design requirements. During installation, ensure that the air intake end 1 is tightly connected to the airflow pipe that needs noise reduction, so that the airflow can smoothly enter the air intake section. At the same time, pay attention to sealing to prevent airflow leakage from generating additional noise.

[0027] Example 3, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure to the embodiment 1: the diffusion section 2 is set as a gradually expanding pipe structure.

[0028] In this embodiment, the diffuser section 2 adopts a gradually expanding pipe structure design. When the airflow enters the diffuser section 2 from the inlet end 1, the airflow speed is reduced as the cross-sectional area of ​​the pipe gradually increases. This design can effectively reduce the generation of turbulence noise because the lower airflow speed can reduce the degree of turbulence inside the airflow, thereby reducing the noise source generated by turbulence.

[0029] The diffuser section 2 is also made of high-quality metal material and is processed according to the design dimensions of the gradually expanding pipe. During installation, the diffuser section 2 is reliably connected to the air inlet 1 to ensure a smooth airflow transition. The length and expansion angle of the diffuser section 2 should be reasonably designed according to parameters such as airflow rate and velocity in the actual application scenario to achieve the best noise reduction effect.

[0030] Example 4, as Figure 2 and Figure 3As shown, this embodiment adds the following structure to the original embodiment 1: the sound-absorbing layer 6 is made of glass wool and foam metal.

[0031] In this embodiment, a sound-absorbing layer 6 is set inside the sound-absorbing section 3. The sound-absorbing layer 6 is made of glass wool and foam metal and has a rich pore structure. When sound waves enter the sound-absorbing layer 6, they will be reflected and scattered multiple times in the pores of the sound-absorbing layer 6. The sound energy is continuously consumed and converted into heat energy, thereby achieving effective absorption of mid-to-high frequency noise and thus being able to cover a wide range of mid-to-high frequency noise.

[0032] The sound-absorbing layer 6 can be firmly installed in the sound-absorbing section 3 by means of pasting, fixing frame or other methods to prevent displacement under the impact of airflow.

[0033] Example 5, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure based on embodiment 1, with the resonant cavity 8 having different sizes.

[0034] In this embodiment, multiple resonant cavities 8 of different sizes are set, each with its own specific resonant frequency. When the frequency of external low-frequency noise matches the resonant frequency of the resonant cavity 8, a resonance effect is triggered, causing the air column inside the resonant cavity 8 to vibrate strongly. During the vibration process, sound energy is continuously consumed, thereby absorbing low-frequency noise and covering a wider range of low-frequency noise bands.

[0035] In particular, by rationally arranging the resonant cavities inside the resonant sleeve 7, they can effectively resonate with low-frequency noise. The number, size, and distribution of the resonant cavities can be precisely designed and adjusted according to the low-frequency noise bands that need to be absorbed.

[0036] Example 6, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure to embodiment 1: the air outlet 5 is designed as a tapered pipe. This structural design facilitates the guidance of the treated airflow.

[0037] In this embodiment, the air outlet 5 adopts a tapered pipe design, which guides the processed airflow out of the device. The tapered pipe design can make the airflow more stable when it flows out, reducing the generation of airflow regeneration noise.

[0038] Among them, airflow regenerated noise refers to the noise generated again after the airflow passes through the silencer due to factors such as the interaction between the airflow and the pipe wall. The tapered pipe can effectively reduce the generation of this noise.

[0039] Among them, the air outlet 5 is tightly connected to other internal parts during installation to ensure that the treated airflow can flow out smoothly, while avoiding the generation of airflow regeneration noise.

[0040] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A broadband air flow noise silencer, characterized by: It includes an air inlet (1), the air inlet (1) is connected to a diffuser section (2), the diffuser section (2) is connected to a muffler section (3), the muffler section (3) is connected to a guide section (4), and the guide section (4) is connected to an air outlet (5). The sound-absorbing layer (6) is installed on both sides of the inside of the silencing section (3). The sound-absorbing layer (6) is located at the output end of the diffusion section (2). The silencing section (3) is provided with a resonance sleeve (7) on the side near the flow guide section (4). The resonance sleeve (7) is provided with several resonance cavities (8).

2. A broadband air flow noise silencer according to claim 1, wherein: The air inlet (1) is configured as a tapered pipe structure.

3. A broadband air flow noise silencer according to claim 2, wherein: The diffusion section (2) is configured as a gradually expanding pipe structure.

4. A broadband air flow noise silencer according to claim 3, wherein: The sound-absorbing layer (6) is made of glass wool and foam metal.

5. A broadband air flow noise silencer according to claim 4, wherein: The resonant cavity (8) has different sizes.

6. A broadband air flow noise silencer according to claim 5, wherein: The air outlet (5) is configured as a tapered pipe structure.

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