Low-frequency air supply noise elimination static pressure box
By combining perforated plates and sound-absorbing materials in a silencing plenum, a composite impedance sound-absorbing structure was designed, which solved the problem of poor noise reduction effect of existing silencing plenums and achieved a more efficient noise reduction effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-03
AI Technical Summary
Existing silencing static pressure boxes have poor noise reduction effects, simple structure and low cost, making it difficult to meet the needs of efficient noise reduction.
The composite impedance sound absorption structure, which combines perforated plates and sound-absorbing materials, achieves better sound absorption through the sound-absorbing structure design of rectangular cavity and sound-absorbing body, combined with sound-absorbing cotton.
By reflecting and refracting airflow within the rectangular cavity, sound energy is consumed, achieving a better noise reduction effect, avoiding reduced airflow, and reducing noise propagation.
Smart Images
Figure CN223965591U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of noise reduction technology for air conditioning and ventilation systems, specifically a low-frequency air supply noise reduction static pressure box. Background Technology
[0002] A plenum chamber is an essential component of an air supply system, used to reduce dynamic pressure, increase static pressure, stabilize airflow, and reduce airflow vibration, thus improving airflow performance. A plenum chamber is a device that allows airflow while effectively preventing or reducing the propagation of sound energy. Existing plenum chambers generally consist of inner and outer shells and sound-absorbing material between them. They achieve noise reduction through this material, offering a simple structure and low cost, but their noise reduction effect is relatively poor and needs improvement. Utility Model Content
[0003] The purpose of this invention is to address the above-mentioned shortcomings by providing a low-frequency air supply silencing static pressure box that combines perforated plates and sound-absorbing materials with composite impedance sound absorption, resulting in better noise reduction.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A low-frequency air supply silencing static pressure box includes a box body, a silencing cavity disposed within the box body, a silencing body disposed between the silencing cavity and the inner wall of the box body, an air inlet communicating with the interior of the silencing cavity on one side of the box body, an air outlet communicating with the interior of the silencing cavity on the bottom of the box body, and a silencing structure disposed within the silencing body.
[0006] Furthermore, the silencing cavity is a rectangular cavity, which is welded together from a front perforated plate, a rear perforated plate, a left perforated plate, a right perforated plate, an upper perforated plate, and a lower perforated plate. The rectangular cavity is fixed inside the box by multiple support frames. The air inlet is connected to the inside of the rectangular cavity through the right perforated plate, and the air outlet is connected to the inside of the rectangular cavity through the lower perforated plate.
[0007] Furthermore, the noise reduction structure includes multiple grooves parallel to each other on the noise reduction body, with a partition plate formed between adjacent grooves, and a U-shaped perforated plate disposed in each groove, the open end of the U-shaped perforated plate being fixed to the left perforated plate.
[0008] Furthermore, the open end of the U-shaped perforated plate is positioned directly opposite the air inlet.
[0009] Furthermore, the length direction of the separator is parallel to the air outlet.
[0010] Furthermore, the sound-absorbing body is made of sound-absorbing cotton.
[0011] The beneficial effects of this utility model are:
[0012] In practical applications, airflow enters the silencing cavity through the air inlet. The airflow is then subjected to composite impedance sound absorption through the combination of the silencing cavity, silencing structure, and silencing body. The silenced airflow is then discharged through the air outlet. This invention combines perforated plates and sound-absorbing materials with composite impedance sound absorption, resulting in better sound absorption. Attached Figure Description
[0013] Figure 1 This is a top view of the present invention;
[0014] Figure 2 This is a cross-sectional view of the present invention;
[0015] Reference numerals: 1. Box body; 11. Air inlet; 12. Air outlet; 2. Silencing body; 31. Front perforated plate; 32. Rear perforated plate; 33. Left perforated plate; 34. Right perforated plate; 35. Upper perforated plate; 35. Lower perforated plate; 41. Groove; 42. Divider plate; 43. U-shaped perforated plate. Detailed Implementation
[0016] like Figure 1 and Figure 2 As shown, a low-frequency air supply silencing static pressure box includes a box body 1, a silencing cavity disposed within the box body 1, a silencing body 2 disposed between the silencing cavity and the inner wall of the box body 1, an air inlet 11 communicating with the interior of the silencing cavity is provided on one side of the box body 1, an air outlet 12 communicating with the interior of the silencing cavity is provided at the bottom of the box body 1, and a silencing structure is provided inside the silencing body 2.
[0017] In use, the airflow enters the silencing cavity through the air inlet 11. The airflow is absorbed by the combination of the silencing cavity, the silencing structure and the silencing body through composite impedance sound absorption. The silenced airflow is discharged through the air outlet 12. This utility model combines perforated plate and sound-absorbing material with composite impedance sound absorption, resulting in better sound absorption effect.
[0018] like Figure 1 and Figure 2 As shown, the silencing cavity is a rectangular cavity, which is welded together from a front perforated plate 31, a rear perforated plate 32, a left perforated plate 33, a right perforated plate 34, an upper perforated plate, and a lower perforated plate 35. The rectangular cavity is fixed inside the housing 1 by multiple support frames. The air inlet 11 is connected to the inside of the rectangular cavity through the right perforated plate 34, and the air outlet 12 is connected to the inside of the rectangular cavity through the lower perforated plate 35. In this embodiment, the rectangular cavity, which is welded together from the front perforated plate 31, the rear perforated plate 32, the left perforated plate 33, the right perforated plate 34, the upper perforated plate, and the lower perforated plate 35, allows noise to be reflected within the rectangular cavity, absorbing and dissipating sound energy, thereby achieving noise resistance absorption in the airflow.
[0019] like Figure 1 and Figure 2 As shown, the silencing structure includes multiple grooves 41 parallel to each other on the silencing body, with a partition 42 formed between adjacent grooves 41. A U-shaped perforated plate 43 is provided in the groove 41, and the open end of the U-shaped perforated plate 43 is fixed on the left perforated plate 33. In this embodiment, some sound waves pass through the left perforated plate 33 and enter the groove 41. The combination of the U-shaped perforated plate 43 and the silencing body 2 achieves composite impedance sound absorption.
[0020] like Figure 1 and Figure 2 As shown, the opening end of the U-shaped perforated plate 43 is positioned directly opposite the air inlet 11. In this embodiment, when the opening end of the U-shaped perforated plate 43 is positioned directly opposite the air inlet 11, noise entering the rectangular cavity is more easily refracted into the groove 41.
[0021] like Figure 1 and Figure 2 As shown, the length direction of the partition plate 42 is parallel to the air outlet 12. In this embodiment, when the length direction of the partition plate 42 is parallel to the air outlet 12, it can play a certain role in guiding the airflow and avoid the situation of reduced air volume during the silencing process.
[0022] like Figure 1 and Figure 2 As shown, the sound-absorbing body 2 is made of sound-absorbing cotton. In this embodiment, after the sound wave enters the sound-absorbing body 2 made of sound-absorbing cotton, it is resisted by the internal pores of the sound-absorbing cotton, and multiple reflections and refractions occur inside the sound-absorbing cotton, thereby consuming the sound wave energy and absorbing the noise in the airflow.
[0023] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the scope defined by this utility model.
Claims
1. A low frequency supply air silencing plenum chamber characterized by: The utility model relates to a sound attenuation box, including box, be provided in the sound attenuation cavity in the box, be provided between the sound attenuation cavity and the sound attenuation body of wall, one side of the box is provided with the air inlet that communicates the inside of the sound attenuation cavity, the bottom of the box is provided with the air outlet that communicates the inside of the sound attenuation cavity, be provided with the sound attenuation structure in the sound attenuation body.
2. A low frequency supply air silencing plenum according to claim 1, wherein, The sound attenuation cavity is rectangular cavity, the rectangular cavity is welded by front side perforated plate, rear side perforated plate, left side perforated plate, right side perforated plate, upper side perforated plate and lower side perforated plate, the rectangular cavity is fixed in the box through a plurality of support frames, the air inlet is communicated rectangular cavity inside through right side perforated plate, the air outlet is communicated rectangular cavity inside through lower side perforated plate.
3. A low frequency supply air silencing plenum according to claim 2, wherein, The sound attenuation structure includes a plurality of grooves opened in parallel on the sound attenuation body, a partition plate formed between adjacent grooves, a U-shaped perforated plate arranged in the groove, and an open end of the U-shaped perforated plate fixed on the left side perforated plate.
4. A low frequency supply air silencing plenum according to claim 3, wherein, The open end of the U-shaped perforated plate is opposite to the air inlet.
5. A low frequency supply air silencing plenum according to claim 3, wherein, The length direction of the partition plate is parallel to the air outlet.
6. A low frequency supply air silencing plenum according to claim 1, wherein, The sound attenuation body is made of sound-absorbing cotton.