Ventilation and noise elimination channel of high-sound-intensity reverberation room

Abstract

The utility model provides a high sound intensity reverberation room ventilation noise elimination channel, which is applied to the noise elimination channel technology field, and comprises a resistive noise elimination section and a reactive noise elimination section to form a composite noise elimination channel, the resistive noise elimination section comprises a sheet type silencer and a maze silencer, one end of the sheet type silencer is provided with a static pressure box group, and the other end of the sheet type silencer is provided with a static pressure box group. The other end of the labyrinth silencer is connected with a resistance silencing section, the other end of the resistance silencing section is connected with a static pressure box connecting piece, the other end of the static pressure box connecting piece is connected with a ventilation pipeline through a soft connecting piece, and the other end of the ventilation pipeline is connected with an outlet pipeline. And an anti-bird net is arranged in the outlet pipeline. According to the ventilation noise elimination channel of the high-sound-intensity reverberation chamber, the static pressure boxes are arranged at the inlet and the outlet of the composite noise elimination channel, dynamic pressure in the channel is reduced through the characteristics of the static pressure boxes, and secondary noise pollution of airflow can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of noise reduction channel technology, specifically relating to a high-intensity reverberation chamber ventilation noise reduction channel. Background Technology

[0002] A silencer is a noise reduction device used in airflow ducts that simultaneously transmit noise. It can be made by using pipes with sound-absorbing linings, bends, or pipes with sudden changes in cross-sectional area or other discontinuous acoustic impedance to attenuate or reflect noise back into the duct.

[0003] In existing technologies, most noise reduction operations are performed using single or composite silencers. Composite silencers combine the characteristics of resistive and reactive silencers, improving the noise reduction bandwidth. However, they have a complex structure, large size, and low airflow stability, which can easily generate secondary noise pollution within the silencer. Utility Model Content

[0004] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a high-intensity reverberation chamber ventilation silencing channel. Static pressure boxes are configured at the inlet and outlet of the composite silencing channel. The characteristics of the static pressure boxes are used to reduce the dynamic pressure in the channel, which helps to reduce secondary noise pollution from the airflow.

[0005] A high-intensity reverberation chamber ventilation silencing channel includes a resistive silencing section and a reactive silencing section to form a composite silencing channel. The resistive silencing section includes a plate silencer and a labyrinth silencer. One end of the plate silencer is equipped with a static pressure box assembly, and the other end is connected to the labyrinth silencer through a variable diameter channel. The other end of the labyrinth silencer is connected to the reactive silencing section. The other end of the reactive silencing section is connected to a static pressure box connector. The other end of the static pressure box connector is connected to a ventilation duct through a flexible connector. The other end of the ventilation duct is connected to an outlet duct, and the outlet duct has a built-in bird-proof net.

[0006] Preferably, the plate silencer includes a resistive housing with built-in sound-absorbing material for eliminating mid-frequency and high-frequency noise.

[0007] Preferably, the labyrinth silencer includes a labyrinth shell and baffles, with the baffles arranged vertically and horizontally within the labyrinth shell to form a serpentine channel for eliminating low-frequency noise.

[0008] Preferably, the reactive noise reduction section includes a reactive silencer, which includes a reactive housing and multiple channel tubes with different diameters. The channel tubes with different diameters are staggered inside the reactive housing to form channels with abrupt diameter changes, which are used to eliminate low-frequency and mid-low-frequency noise.

[0009] Preferably, the labyrinth shell of the labyrinth muffler, the baffle, and the resistive shell of the plate muffler all include perforated aluminum plates and galvanized steel plates, with sound-absorbing material disposed between the perforated aluminum plates and the galvanized steel plates.

[0010] Preferably, the aluminum perforated plate has a thickness of 0.8 mm, a hole diameter of 3 mm, a perforation rate of 25%, and the sound-absorbing material is aramid cotton, and the galvanized steel plate has a thickness of 1.5 mm.

[0011] Preferably, the flexible connector includes aluminum alloy foil, steel wire rope, and aramid fiber, wherein the steel wire rope is disposed within the aluminum alloy foil, which is used to wrap the aramid fiber.

[0012] Preferably, the static pressure box assembly includes two static pressure boxes, which are constructed with right-angle bends. Each static pressure box is equipped with sound-absorbing material. One end of the static pressure box assembly is connected to the embedded part of the reverberation chamber, and the other end is connected to the resistive silencing section.

[0013] Preferably, a portion of the anechoic channel is supported above the reverberation chamber by a support member installed on the top of the reverberation chamber, and the other portion of the anechoic channel is supported by a hanger rod connected to the top wall.

[0014] Preferably, the outlet pipe is set in an elbow shape, and the interior of the outlet pipe is equipped with self-closing louvers.

[0015] The beneficial effects of this utility model are: the high sound intensity reverberation chamber ventilation silencing channel, through the combination of resistive silencing section composed of plate silencer and labyrinth silencer and reactive silencing section to form a composite silencing channel, can effectively eliminate low, medium and high frequency noise, is suitable for a variety of noise sources, provides significant silencing effect in a wide frequency range, and meets the high requirements of noise control.

[0016] Meanwhile, static pressure boxes are installed at the inlet of the resistive silencing section and the outlet of the reactive silencing section. The characteristics of the static pressure boxes are used to reduce the dynamic pressure in the channel, increase the static pressure, stabilize the airflow, and reduce airflow vibration, which helps to reduce secondary noise pollution from the airflow.

[0017] Furthermore, each muffler is equipped with a keel structure, which can effectively increase the structural strength of each muffler and reduce the noise radiated due to the vibration of the muffler structure under the impact of airflow. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model applied to a reverberation chamber.

[0021] The following are marked in the diagram: 1. Static pressure box assembly; 2. Plate silencer; 3. Variable diameter channel; 4. Labyrinth silencer; 5. Resistant silencer; 6. Static pressure box connector; 7. Flexible connector; 8. Ventilation duct; 9. Outlet duct; 10. Bird net; 11. Support component; 12. Hanger rod. Detailed Implementation

[0022] Example 1

[0023] like Figure 1 As shown, a high-intensity reverberation chamber ventilation silencing channel includes a resistive silencing section and a reactive silencing section. The resistive and reactive silencing sections form a composite silencing channel, achieving the elimination of low-frequency, mid-frequency, and high-frequency noise.

[0024] The resistive silencing section includes a plate silencer 2 and a labyrinth silencer 4. The plate silencer 2 includes a resistive housing with built-in sound-absorbing material to eliminate mid-frequency and high-frequency noise. The labyrinth silencer 4 includes a labyrinthine housing and baffles. The baffles are staggered vertically within the labyrinthine housing to form a serpentine channel, used to eliminate low-frequency noise. The plate silencer 2 reduces mid-frequency and high-frequency noise while also reducing the air velocity entering the labyrinth silencer 4, facilitating its silencing operation.

[0025] The labyrinth muffler 4's labyrinth shell and baffle, as well as the resistive shell of the plate muffler 2, all consist of a perforated aluminum plate and a galvanized steel plate, with sound-absorbing material disposed between the perforated aluminum plate and the galvanized steel plate. In this embodiment, the perforated aluminum plate has a thickness of 0.8 mm, a perforation diameter of 3 mm, a perforation rate of 25%, and the sound-absorbing material is aramid cotton; the galvanized steel plate has a thickness of 1.5 mm.

[0026] The reactive silencing section includes a reactive silencer 5, which includes a reactive housing and multiple channel tubes with different diameters. These channel tubes are staggered within the reactive housing to form channels with abrupt diameter changes, which are used to eliminate low-frequency and mid-low-frequency noise.

[0027] like Figure 1 As shown, one end of the plate silencer 2 is equipped with a static pressure box assembly 1, and the other end is connected to the labyrinth silencer 4 through a variable diameter channel 3. The variable diameter channel 3 allows the plate silencer 2 and the labyrinth silencer 4 with different diameters to be connected.

[0028] The other end of the labyrinth silencer 4 is connected to the resistive silencer 5. The other end of the resistive silencer 5 is connected to the static pressure box connector 6. The other end of the static pressure box connector 6 is connected to the ventilation duct 8 through the flexible connector 7. The other end of the ventilation duct 8 is connected to the outlet pipe 9. The outlet pipe 9 has a built-in bird net 10.

[0029] The static pressure box assembly 1 and the static pressure box connector 6 reduce the dynamic pressure in the channel, reduce airflow noise while stabilizing airflow, and facilitate the operation of multiple silencers.

[0030] In this embodiment, the flexible connector 7 includes aluminum alloy foil, steel wire rope, and aramid fiber. The steel wire rope is embedded in the aluminum alloy foil to improve its hardness and plasticity, and the aluminum alloy foil is used to wrap the aramid fiber. The flexible connector 7 connects the static pressure box connector 6 to the ventilation duct 8, reducing vibration within the channel. Furthermore, flexible connectors 7 can be added at both ends of each noise-reducing section to achieve a buffering effect and reduce secondary noise generated by vibration.

[0031] Example 2

[0032] like Figure 2 As shown, the structure of this embodiment is basically the same as that in Embodiment 1, except that: the static pressure box assembly 1 in this embodiment includes two static pressure boxes, which are constructed with a right-angle bend structure. Each static pressure box is equipped with sound-absorbing material. One end of the static pressure box assembly 1 is connected to the embedded part of the reverberation chamber, and the other end is connected to the plate silencer 2. The right-angle bend structure of the static pressure box assembly 1 is used to change the airflow direction, and its built-in sound-absorbing material can perform noise reduction.

[0033] A portion of the ventilation and anechoic duct of the high-intensity reverberation chamber is supported above the reverberation chamber by a support member 11, which is installed on the top of the reverberation chamber. The other portion of the ventilation and anechoic duct is supported by a hanger 12, which is connected to the top wall.

[0034] In addition, such as Figure 2 As shown, in this embodiment, the channel formed between the static pressure box connector 6 and the flexible connector 7 is Z-shaped. The direction of the entire channel is adjusted by the static pressure box connector 6 and the flexible connector 7 to facilitate the airflow in the reverberation chamber to be led out to the outlet pipe 9. The outlet pipe 9 is set in an elbow shape and is equipped with self-closing louvers inside, which can automatically close to prevent animals and dust from entering the fire escape.

[0035] The total length of the ventilation and anechoic chamber ventilation duct in the high-intensity reverberation chamber is determined based on the actual installation environment. In this embodiment, the total length of the anechoic chamber is set to 25m, and the maximum airflow reaches 400m³ / h. 3 / min, the wind speed in the silencer channel is no more than 7.5m / s. Among them, the length of the plate silencer 2 is set to 6m; the length of the labyrinth silencer 4 is set to 3.5m, and because the airflow channel area of ​​the labyrinth silencer 4 often changes, it also has the characteristics of a reactive silencer, with a wide silencing frequency band, which can eliminate noise in the frequency range of 31.5Hz to 125Hz; the length of the reactive silencer 5 is set to 6.4m.

[0036] It should be noted that, in order to enhance the structural strength of each muffler, the plate muffler 2, the labyrinth muffler 4, and the resistive muffler 5 are all equipped with a keel structure.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-intensity reverberation chamber ventilation and noise reduction channel, characterized in that, It includes a resistive silencing section and a reactive silencing section. The resistive silencing section includes a plate silencer (2) and a labyrinth silencer (4). One end of the plate silencer (2) is equipped with a static pressure box assembly (1), and the other end is connected to the labyrinth silencer (4) through a variable diameter channel (3). The other end of the labyrinth silencer (4) is connected to the reactive silencing section. The other end of the reactive silencing section is connected to a static pressure box connector (6). The other end of the static pressure box connector (6) is connected to a ventilation duct (8) through a flexible connector (7). The other end of the ventilation duct (8) is connected to an outlet pipe (9). The outlet pipe (9) has a built-in bird net (10).

2. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The plate silencer (2) includes a resistive housing with built-in sound-absorbing material for eliminating mid-frequency and high-frequency noise.

3. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The labyrinth silencer (4) includes a labyrinth shell and baffles. The baffles are staggered inside the labyrinth shell to form a serpentine channel, which is used to eliminate low-frequency noise.

4. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The reactive silencing section includes a reactive silencer (5), which includes a reactive shell and multiple channel tubes. The multiple channel tubes have different diameters and are staggered inside the reactive shell to form channels with abrupt diameter changes, which are used to eliminate low-frequency and mid-low-frequency noise.

5. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The labyrinth shell of the labyrinth muffler (4), the baffle, and the resistive shell of the plate muffler (2) all include perforated aluminum plates and galvanized steel plates, with sound-absorbing material disposed between the perforated aluminum plates and the galvanized steel plates.

6. The high-intensity reverberation chamber ventilation and silencing channel according to claim 5, characterized in that, The aluminum perforated plate has a thickness of 0.8 mm, a hole diameter of 3 mm, a perforation rate of 25%, and the sound-absorbing material is aramid cotton. The galvanized steel plate has a thickness of 1.5 mm.

7. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The flexible connector (7) includes an aluminum alloy foil, a steel wire rope, and aramid cotton. The steel wire rope is disposed inside the aluminum alloy foil, which is used to wrap the aramid cotton.

8. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The static pressure box assembly (1) includes two static pressure boxes, which are constructed with right-angle bends. Each static pressure box is equipped with sound-absorbing material. One end of the static pressure box assembly (1) is connected to the embedded part of the reverberation chamber, and the other end is connected to the resistive silencing section.

9. The high-intensity reverberation chamber ventilation and silencing channel according to claim 8, characterized in that, A portion of the anechoic passage is supported above the reverberation chamber by a support member (11), which is installed on the top of the reverberation chamber. The other portion of the anechoic passage is supported by a hanger (12), which is connected to the top wall.

10. The high-intensity reverberation chamber ventilation and silencing channel according to claim 1, characterized in that, The outlet pipe (9) is set in an elbow shape, and the interior of the outlet pipe (9) is equipped with self-closing louvers.

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