sound deadening box

Abstract

This utility model relates to the field of ventilation and noise reduction technology, and discloses a silencing box, including a box body assembled from several silencing panels; an air inlet is provided on one side of the box body, and an air outlet is provided on the opposite side; wherein the air inlet and air outlet are at different heights; a partition component assembled from the silencing panels is disposed within the box body to divide the box body into a first silencing chamber and a second silencing chamber; the first silencing chamber is connected to the air inlet and air outlet; the second silencing chamber is also connected to the air inlet and air outlet; a flow guiding structure is disposed within at least one of the first and second silencing chambers; wherein the flow guiding structure is used to form a "Z"-shaped air duct within its respective silencing chamber to guide airflow. This utility model significantly improves broadband noise attenuation efficiency through the synergistic effect of the dual-chamber layout and the zigzag air duct, while the modular assembly structure facilitates maintenance and expansion, combining the advantages of high noise reduction performance and low maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of ventilation and noise reduction technology, and to a soundproof box, and more particularly to a ventilation and noise reduction soundproof box. Background Technology

[0002] As a core component of noise reduction in industrial ventilation systems, the technological development of silencers mainly revolves around the optimization of sound-absorbing materials, cavity structure design, and airflow path control. Existing research shows that traditional single-cavity silencers, which use straight-through ducts filled with fiberglass sound-absorbing cotton, can achieve high-frequency noise attenuation, but their sound absorption coefficient in the low-frequency range is not high. When the airflow velocity is too high, this type of structure is prone to generating turbulence at the corners of the duct, causing secondary noise. Summary of the Invention

[0003] Therefore, the purpose of this utility model is to overcome the problems of low sound absorption coefficient and secondary noise caused by existing single-cavity direct-through silencing structures, and to provide a silencing box for optimizing noise reduction effect, including,

[0004] A box assembled from several sound-absorbing panels; an air inlet is provided on one side of the box, and an air outlet is provided on the opposite side; wherein the air inlet and the air outlet are at different heights;

[0005] The sound-absorbing panel assembly includes a partition that divides the enclosure into a first sound-absorbing chamber and a second sound-absorbing chamber. The first sound-absorbing chamber is connected to the air inlet and the air outlet. The second sound-absorbing chamber is also connected to the air inlet and the air outlet.

[0006] A flow guiding structure is provided at least inside at least one of the first and second anechoic chambers; wherein the flow guiding structure is used to form a "Z"-shaped air duct within its respective anechoic chamber to guide airflow.

[0007] In one embodiment of this utility model, the flow guiding structure is fixed to the inner wall of the box; wherein the flow guiding structure is configured to be assembled by the sound-absorbing plate, and the modular assembly achieves synergistic optimization of structural flexibility and noise reduction performance.

[0008] In one embodiment of this utility model, the cross-section of the airflow guiding structure is "L" shaped, including a vertical extension portion and a horizontal extension portion connected thereto. The vertical extension portion is positioned directly opposite the air inlet, and the horizontal extension portion extends toward the air outlet, forming a zigzag airflow path. This utilizes phenomena such as sound wave reflection and interference to achieve a noise reduction effect.

[0009] In one embodiment of this utility model, the sound-absorbing plate includes a support body with a receiving cavity inside; at least one side of the support body forms an opening; a sound-absorbing cotton layer is disposed in the receiving cavity, and the sound absorption effect is achieved by absorbing noise through the resonance of the porous material with the cavity.

[0010] In one embodiment of the present invention, the sound-absorbing plate further includes an air distribution component, which is located at the opening and connected to the support body; the air distribution component is uniformly provided with mesh holes communicating with the receiving cavity, for balancing the airflow velocity distribution and suppressing turbulent noise.

[0011] In one embodiment of this utility model, a protective layer is provided between the air distribution component and the support body, which has a certain sound absorption effect. At the same time, the flexible filter layer blocks particulate matter from entering the sound absorption cotton layer, extending the service life of the sound absorption material.

[0012] In one embodiment of this utility model, the support body is bent inward to form an ear on the side where the opening is located, and the air distribution member is connected to the ear to achieve detachable maintenance while ensuring airtightness.

[0013] In one embodiment of this utility model, the cross-sectional area S1 of the part of the air inlet that is connected to the first anechoic chamber is smaller than the flow cross-sectional area S2 of the first anechoic chamber, and the cross-sectional area S3 of the part of the air outlet that is connected to the first anechoic chamber is smaller than the flow cross-sectional area S2 of the second anechoic chamber. The chamber flow velocity difference in the first anechoic chamber is controlled differently by designing the cross-sectional area difference.

[0014] In one embodiment of this utility model, the cross-sectional area S4 of the part connecting the air inlet and the second anechoic chamber is smaller than the flow cross-sectional area S5 of the second anechoic chamber, and the cross-sectional area S6 of the part connecting the air outlet and the second anechoic chamber is smaller than the flow cross-sectional area S5 of the second anechoic chamber. Similarly, the differential control of the chamber flow velocity in the second anechoic chamber is achieved through the design of the cross-sectional area difference.

[0015] In one embodiment of this utility model, the air inlet is provided with an airflow diffusion device to make the incoming airflow evenly distributed; the air outlet is equipped with a rectifier device to make the noise-reduced airflow smoothly discharged; the airflow diffusion device makes the airflow evenly distributed to the anechoic chamber; the rectifier device ensures that the noise-reduced airflow is smoothly discharged, reducing the noise generated by turbulence.

[0016] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0017] The anechoic chamber described in this utility model achieves efficient noise reduction through the synergistic effect of a dual-chamber structure and a guide air duct. The separator divides the chamber into two anechoic chambers, and the staggered arrangement of the air inlet and outlet forms a flow diversion mechanism, allowing the airflow to flow in a "Z" shape synchronously within the dual chambers. This extends the sound wave propagation path and enhances the reflection interference effect, effectively improving the attenuation capability of mid-to-low frequency noise. At the same time, the modular anechoic plate assembly structure enables rapid integration of the chamber and the guide plate through standardized components. This reduces the single-channel flow velocity while ensuring uniform airflow distribution, suppressing turbulent noise, and balancing wideband noise reduction performance with the flexibility of maintenance and expansion. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural diagram of the silencer box in a preferred embodiment of the present utility model;

[0020] Figure 2 for Figure 1 The anechoic chamber shown is a cross-sectional view along line AA.

[0021] Figure 3 for Figure 2 Sectional view along the BB direction;

[0022] Figure 4 for Figure 1 The diagram shows an explosion of the silencer box.

[0023] Figure 5 This is a schematic diagram of the sound-absorbing plate in a preferred embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the sound-absorbing plate in another embodiment.

[0025] Explanation of the markings on the attached drawings: 1. Housing; 2. Air inlet; 3. Air outlet; 4. First silencing chamber; 5. Second silencing chamber; 6. Airflow guide structure; 7. Separator; 8. Silencing plate; 9. Support body; 10. Receiving cavity; 11. Silencing cotton layer; 12. Air distribution component; 13. Protective layer; 14. Ear. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example

[0027] Reference Figure 1-3As shown, this utility model embodiment discloses a silencing box, including a box body 1 assembled from several silencing plates 8, a partition 7 assembled from the silencing plates 8, and a flow guiding structure 6; an air inlet 2 is provided on one side of the box body 1, and an air outlet 3 is provided on the opposite side; wherein, the air inlet 2 and the air outlet 3 are at different heights; the partition is disposed inside the box body 1 to divide the box body 1 into a first silencing chamber 4 and a second silencing chamber 5; the first silencing chamber 4 is connected to the air inlet 2 and the air outlet 3; the second silencing chamber 5 is connected to the air inlet 2 and the air outlet 3; the flow guiding structure 6 is disposed inside at least one of the first silencing chamber 4 and the second silencing chamber 5; wherein, the flow guiding structure 6 is used to form a "Z"-shaped air duct in the silencing chamber in which it is located to guide the airflow.

[0028] The flow guiding structure 6 is fixed to the inner wall of the housing 1; wherein the flow guiding structure 6 is configured to be assembled by the sound-absorbing plate 8.

[0029] The cross-section of the airflow guiding structure 6 is "L" shaped, including a vertical extension and a horizontal extension connected thereto. The vertical extension is positioned directly opposite the air inlet 2, and the horizontal extension extends toward the air outlet 3.

[0030] The flow guiding structure 6 can be installed in the first anechoic chamber 4, or in the second anechoic chamber 5, or both anechoic chambers simultaneously.

[0031] When the two anechoic chambers are designed symmetrically and both are equipped with airflow guiding structures, the sound absorption effect is maximized, ensuring that the two noise airflow paths and velocities are consistent when the airflow enters the anechoic chambers, thus achieving uniform distribution and synchronous attenuation of noise energy; the dual-channel design reduces single-path wind resistance and avoids local noise amplification caused by uneven airflow distribution.

[0032] In this embodiment of the invention, the enclosure 1 is formed by assembling several standardized sound-absorbing panels 8 through connectors to form a sealed enclosure 1. The enclosure 1 uses a metal frame as the main support structure, and air inlets 2 and air outlets 3 are respectively opened on the two side walls, with the central axes of the air inlets 2 and air outlets 3 arranged in a staggered manner.

[0033] The interior of the enclosure 1 is divided into a first anechoic chamber 4 and a second anechoic chamber 5, which are arranged side by side along the airflow direction by a partition 7 assembled with anechoic plates 8. The two anechoic chambers are distributed along the airflow direction, and the height of the partition 7 is flush with the wall of the enclosure 1, forming an independent double-chamber structure.

[0034] Reference Figure 4 As shown, the separator 7 in this embodiment of the invention consists of two sound-absorbing plates 8 with an "L" shape conforming to the flow guiding structure 6, which ensures the sound absorption effect of the two sound-absorbing chambers while also taking into account the ease of installation.

[0035] The sound-absorbing plate 8 includes a support body 9, which has a receiving cavity 10 inside; at least one side of the support body 9 forms an opening; and a sound-absorbing cotton layer 11 is disposed in the receiving cavity 10.

[0036] The sound-absorbing plate 8 also includes an air distribution component 12, which is located at the opening and connected to the support body 9; the air distribution component 12 is uniformly provided with mesh holes that communicate with the receiving cavity 10.

[0037] A protective layer 13 is also provided between the air distribution component 12 and the support body 9.

[0038] The support 9 is bent inwards at the opening to form an ear 14, and the air distribution member 12 is connected to the ear 14.

[0039] Reference Figure 5-6 As shown, the sound-absorbing plate 8 in this embodiment of the invention adopts a layered structure, including a support body 9, a sound-absorbing cotton layer 11, an air distribution component 12, and a protective layer 13.

[0040] The support body 9 is formed by bending sheet metal with a thickness of 1.2 mm. The sound-absorbing plate 8 support body 9 that constitutes the box body 1 and the flow guiding structure 6 has an opening on one side, and the opening side is bent inward to form an ear 14; the sound-absorbing plate 8 support body 9 that constitutes the partition 7 has two opposite openings, and the openings are bent inward to form an ear 14; a hollow receiving cavity 10 is formed inside the support body 9.

[0041] The support 9 ensures the structural stability of the enclosure 1 and also serves to fix the internal sound-absorbing cotton layer 11.

[0042] In this embodiment of the present invention, the sound-absorbing cotton layer 11 is 45 mm thick and is tightly filled in the cavity 10 formed by the support body 9. It is made of heat-insulating cotton material.

[0043] The insulation cotton has excellent sound absorption properties and heat insulation properties, effectively reducing heat transfer while efficiently absorbing noise.

[0044] The air distribution component 12 is located at the opening surface covering the support body 9 and is connected to it through the metal ear 14 formed by bending the support body 9.

[0045] The air distribution component 12 is made of a perforated plate with uniformly arranged mesh holes, and the mesh holes are connected to the receiving cavity 10.

[0046] The protective layer 13 is made of sound-absorbing nylon cloth. The nylon cloth is evenly covered between the air distribution component 12 and the support body 9. It is tough and prevents the insulation cotton inside the support body 9 from loosening. At the same time, it also has certain sound absorption characteristics, further enhancing the sound absorption effect.

[0047] The cross-sectional area S1 of the portion connecting the air inlet 2 and the first silencing chamber 4 is smaller than the flow cross-sectional area S2 of the first silencing chamber 4, and the cross-sectional area S3 of the portion connecting the air outlet 3 and the first silencing chamber 4 is smaller than the flow cross-sectional area S2 of the second silencing chamber 5.

[0048] The cross-sectional area S4 of the portion connecting the air inlet 2 and the second silencing chamber 5 is smaller than the flow cross-sectional area S5 of the second silencing chamber 5, and the cross-sectional area S6 of the portion connecting the air outlet 3 and the second silencing chamber 5 is smaller than the flow cross-sectional area S5 of the second silencing chamber 5.

[0049] Reference Figure 1-3 As shown, in this embodiment of the present invention, the cross-sectional areas of the air inlet 2 and the air outlet 3 are both smaller than the flow cross-sectional area of ​​the anechoic chamber. The airflow velocity difference in the anechoic chamber is achieved by the cross-sectional area difference design, which increases the residence time of the noise airflow in the anechoic chamber and improves the sound absorption effect.

[0050] The air inlet 2 is equipped with an airflow diffusion device to ensure that the incoming airflow is evenly distributed; the air outlet 3 is equipped with a rectifier to ensure that the noise-reduced airflow is smoothly discharged.

[0051] Reference Figure 1-3 As shown, a grille is installed at the air inlet 2 as an airflow diffusion device. The incoming airflow is evenly dispersed through the grille, avoiding additional noise caused by concentrated airflow.

[0052] The air outlets 3 are also equipped with grilles as rectifiers. The airflow after noise reduction in the anechoic chamber is discharged smoothly through the grilles, reducing secondary noise generated by turbulence and consolidating the anechoic effect.

[0053] In this embodiment of the utility model, the noise airflow path is as follows: the airflow enters from the air inlet 2, is evenly distributed to the two silencing chambers by the airflow diffusion device, is guided to the air outlet 3 by the flow guiding structure 6, and is finally discharged after passing through the rectifier device.

[0054] In this embodiment of the invention, high-frequency noise is directly absorbed by the sound-absorbing material that makes up the silencing plate 8; the "Z"-shaped air duct forces the airflow to reflect in the silencing chamber, and the distance between the inner wall of the box 1 and the guide plate forms a resonance, so that low-frequency noise achieves attenuation through path interference and resonance.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A silencer box, characterized in that: include, A box assembled from several sound-absorbing panels; an air inlet is provided on one side of the box, and an air outlet is provided on the opposite side; wherein the air inlet and the air outlet are at different heights; The sound-absorbing panel assembly includes a partition that divides the enclosure into a first sound-absorbing chamber and a second sound-absorbing chamber. The first sound-absorbing chamber is connected to the air inlet and the air outlet. The second sound-absorbing chamber is also connected to the air inlet and the air outlet. A flow guiding structure is provided at least inside at least one of the first and second anechoic chambers; wherein the flow guiding structure is used to form a "Z"-shaped air duct within its anechoic chamber to guide airflow.

2. The silencer according to claim 1, characterized in that: The flow guiding structure is fixed to the inner wall of the box; wherein the flow guiding structure is configured to be assembled by the sound-absorbing plate.

3. A silencer box according to claim 1 or 2, characterized in that: The cross-section of the airflow guiding structure is "L" shaped, including a vertical extension and a horizontal extension connected thereto. The vertical extension is positioned directly opposite the air inlet, and the horizontal extension extends toward the air outlet.

4. A silencer box according to claim 1 or 2, characterized in that: The sound-absorbing plate includes, A support body having a receiving cavity inside; the support body has an opening on at least one side. A sound-absorbing cotton layer is disposed within the receiving cavity.

5. A silencer box according to claim 4, characterized in that: The sound-absorbing plate also includes, An air distribution component is located at the opening and connected to the support body; the air distribution component is uniformly provided with mesh holes that communicate with the receiving cavity.

6. A silencer box according to claim 5, characterized in that: A protective layer is also provided between the air distribution component and the support body.

7. A silencer box according to claim 5, characterized in that: The support body is bent inward to form an ear on the side where the opening is located, and the air distribution member is connected to the ear.

8. A silencer box according to claim 1, characterized in that: The cross-sectional area S1 of the part of the air inlet that connects to the first anechoic chamber is smaller than the flow cross-sectional area S2 of the first anechoic chamber, and the cross-sectional area S3 of the part of the air outlet that connects to the first anechoic chamber is smaller than the flow cross-sectional area S2 of the second anechoic chamber.

9. A silencer box according to claim 1 or 8, characterized in that: The cross-sectional area S4 of the part connecting the air inlet and the second anechoic chamber is smaller than the flow cross-sectional area S5 of the second anechoic chamber, and the cross-sectional area S6 of the part connecting the air outlet and the second anechoic chamber is smaller than the flow cross-sectional area S5 of the second anechoic chamber.

10. A silencer box according to claim 1, characterized in that: The air inlet is equipped with an airflow diffusion device to ensure that the incoming airflow is evenly distributed; the air outlet is equipped with a rectifier device to ensure that the noise-reduced airflow is smoothly discharged.

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