A multi-periodic sheet silencer

Abstract

The utility model discloses a multi -cycle piece type muffler, including the outer frame (1) and set up in the multiple muffling single cell (2) of outer frame (1) inside, its characterized in that: every muffling single cell (2) contains two or more than different thickness and parallel interval arrangement's sheet sound absorber, multiple muffling single cell (2) is along the height direction or width direction periodic parallel interval arrangement of outer frame (1), every kind same thickness's sheet sound absorber corresponds to one arrangement interval, to make all muffling single cell's sound absorber in the height direction or width direction formation two or more than different arrangement period of outer frame (1).

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, specifically to a multi-period plate silencer. Background Technology

[0002] Large ventilation equipment provides a large amount of airflow during operation. At the same time, the noise generated by the equipment is radiated to the acoustic environment functional area through the airflow channel, causing noise interference to the acoustic environment functional area. At this time, it is necessary to design a silencer that can both meet the ventilation of the airflow channel and reduce noise. Therefore, the plate silencer was developed.

[0003] A plate-type silencer consists of multiple parallel plate-shaped sound-absorbing elements. In existing plate-type silencers, all the sound-absorbing elements have the same thickness; that is, each plate-shaped sound-absorbing element forms a sound-absorbing unit cell, and the space between these units serves as an airflow channel. For this type of plate-type silencer, the ventilation rate = airflow area ÷ total channel area. Here, the "airflow area" is determined by the spacing between the plate-shaped sound-absorbing elements, and the "total channel area" equals the airflow area plus the area occupied by the sound-absorbing elements. The "area" here is defined based on a cross-section perpendicular to the airflow direction.

[0004] In this type of silencer, as the unit cell thickness increases, the low-frequency effect improves. However, to maintain a constant ventilation rate, the spacing between the silencers must also increase, leading to a lower high-frequency failure frequency, a poorer high-frequency silencing effect, and an increased space occupied by the silencer. To achieve the same silencing effect, the only solution is to increase the length of the silencers, which in turn increases the amount of material used and further increases the space occupied.

[0005] Therefore, it is particularly important to design and manufacture plate silencers that can simultaneously ensure low-frequency and high-frequency noise reduction effects under the same ventilation rate. Summary of the Invention

[0006] The main purpose of this invention is to overcome the shortcomings of the existing technology and provide a plate silencer with higher space and material utilization and better high-frequency and low-frequency noise reduction performance. This will overcome the contradiction between low-frequency and high-frequency noise reduction performance and the difficulty in balancing performance with space occupation / material cost caused by the single-thickness silencer body in the existing plate silencers.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A multi-period plate silencer includes an outer frame and a plurality of silencer units disposed within the outer frame. Each silencer unit comprises two or more plate-shaped silencers of different thicknesses arranged at intervals. The plurality of silencer units are arranged at intervals periodically along the height or width direction of the outer frame. Each type of plate-shaped silencer of the same thickness corresponds to a certain arrangement spacing, so that the silencers of all silencer units form two or more different arrangement periods in the height or width direction of the outer frame.

[0008] Furthermore, the depth direction of the outer frame is the length extension direction of the sheet-like sound-absorbing body.

[0009] Furthermore, the plurality of silencing unit cells are arranged periodically at intervals along the width direction of the outer frame, the height direction of the outer frame is the height direction of the sheet-like silencing body, and the thickness of the sheet-like silencing body is the dimension along the width direction of the outer frame.

[0010] Furthermore, the plurality of silencing unit cells are arranged periodically at intervals along the height direction of the outer frame, the width direction of the outer frame is the width direction of the sheet-like silencing body, and the thickness of the sheet-like silencing body is the dimension along the height direction of the outer frame.

[0011] Furthermore, the sheet-like sound-absorbing body includes a shell and a sound-absorbing material filled inside the shell.

[0012] Furthermore, the sheet-like sound-absorbing body also includes flow guides disposed on two opposite sides along its length.

[0013] Furthermore, the flow guide is semi-cylindrical in shape, and its diameter is the same as the thickness of the sheet-like sound-absorbing body.

[0014] Furthermore, the outer shell of the sheet-like sound absorber is provided with a plurality of sound-absorbing holes with a hole diameter of 0.1mm to 5mm and a perforation rate of 0.1% to 35% on the outer shell.

[0015] Furthermore, the diameter of the sound-absorbing hole is 2mm to 3mm, and the perforation rate on the outer shell is 20% to 30%.

[0016] Compared to existing single-thickness plate silencers, this invention's multi-cycle plate silencer incorporates two or more plate-shaped silencers of varying thicknesses within each unit cell. The thicker silencer primarily enhances low-frequency noise reduction. Optimized spatial spacing between these different thicknesses allows for smaller spacing at the same ventilation rate, increasing the high-frequency failure frequency and thus improving high-frequency performance. Ultimately, this achieves a balance between low and high frequencies, ensuring effective noise reduction for both while enhancing high-frequency performance. It also increases white noise reduction (white noise is used as the sound source in laboratory insertion loss testing) and reduces material usage and space requirements. This synergistic effect achieves a balance between high-efficiency noise reduction over a wider frequency band and system compactness and economy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a multi-cycle plate silencer according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 The diagram shows a single cell schematic of a multi-period plate silencer.

[0019] Figure 3 yes Figure 1 The front view of the multi-period plate silencer is shown.

[0020] Figure 4 yes Figure 1 The image shows a top view of a multi-period plate silencer.

[0021] Figure 5 This is a schematic diagram of a multi-cycle plate silencer according to another embodiment of the present invention.

[0022] Figure 6 yes Figure 5 The diagram shows a single cell schematic of a multi-period plate silencer.

[0023] Figure 7 This is a comparison diagram of the noise reduction effects of a dual-cycle silencer and a single-thickness silencer according to an embodiment of this utility model. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The embodiments provided are for illustrative purposes only and are not intended to be limiting. Furthermore, the spatial directional terms such as "upper," "lower," "left," "right," "top," and "bottom" used in the description of the technical solution of the present invention are for the convenience of describing the relative positional relationships between the product's constituent components. They do not imply that the product only has the orientation shown in the drawings. In actual use, as the product's orientation changes, the spatial descriptions used to describe its orientation should also be interpreted in a similar manner. In addition, terms such as "first" and "second" are only used to distinguish components. It should be understood that these components should not be limited by such terms, and they do not inherently imply that these components have the aforementioned ordinal numbers, nor do they represent the arrangement order of one component with another or the order of manufacturing methods.

[0025] Please refer to Figure 1 This utility model provides a multi-period plate silencer, including an outer frame 1 and a plurality of silencer units 2 fixed within the outer frame 1. Each silencer unit 2 contains two or more plate-shaped silencers 20 of different thicknesses arranged at intervals, arranged in a "face-to-face" and almost parallel interval manner. The plurality of silencer units 2 are periodically arranged at intervals along the width direction W or height direction H of the outer frame 1, arranged in a "face-to-face" and almost parallel interval manner. Each type of plate-shaped silencer of the same thickness corresponds to an arrangement spacing, so that the silencers of all silencer units form two or more different arrangement periods in the width direction W or height direction H of the outer frame 1.

[0026] In an embodiment where multiple sound-absorbing unit cells 2 are periodically arranged in parallel intervals along the width direction W of the outer frame 1 (i.e., the sheet-like sound-absorbing bodies are arranged in "vertical" parallel intervals), such as Figure 1 The thickness of the sheet-like sound-absorbing body 20 is the dimension of the sheet-like sound-absorbing body along the width direction W, the height direction of the outer frame 1 is the height direction of the sheet-like sound-absorbing body, and the depth direction of the outer frame 1 is the length extension direction of the sheet-like sound-absorbing body 20.

[0027] In an embodiment where multiple sound-absorbing unit cells 2 are periodically arranged in parallel intervals along the height direction H of the outer frame 1 (i.e., the sheet-like sound-absorbing bodies are arranged in parallel intervals "laterally") (not shown), the thickness of the sheet-like sound-absorbing body is the dimension of the sheet-like sound-absorbing body along the height direction H, the width direction of the outer frame 1 is the width direction of the sheet-like sound-absorbing body, and the depth direction of the outer frame 1 is the length extension direction of the sheet-like sound-absorbing body 20.

[0028] refer to Figures 1 to 4In one exemplary embodiment, each unit cell 2 comprises two sheet-like sound-absorbing bodies of different thicknesses: a first sheet-like sound-absorbing body 21 with a thickness of d1, and a second sheet-like sound-absorbing body 22 with a thickness of d2, where d1 > d2. Each sheet-like sound-absorbing body includes a shell and sound-absorbing material filled within the shell. Taking the thicker first sheet-like sound-absorbing body 21 as an example, its structure includes a shell 210 and resistive or reactive sound-absorbing material filled within the cavity enclosed by the shell, and further includes flow guides 212 disposed on two opposite sides along the length of the sound-absorbing body; wherein, the flow guides 212 are semi-cylindrical, preferably with a semi-circular diameter the same as the thickness d1 of the first sheet-like sound-absorbing body 21. Since the gas flow direction is along the length extension direction of the sheet-like sound-absorbing body, the semi-cylindrical flow guides disposed at both ends along the length direction can prevent the airflow from abruptly constricting at one end of the sheet-like sound-absorbing body inlet, reducing the direct impact between the airflow and the shell of the sound-absorbing body, thereby reducing pressure loss. The second sheet-like sound-absorbing element 22 has a similar structural composition, with the main difference being the thickness, and therefore will not be described further. It should be understood that the sheet-like sound-absorbing elements within each unit cell are not limited to the two thicknesses listed above; a unit cell can also consist of three, four, or even more sheet-like sound-absorbing elements of different thicknesses. For example, Figure 5 and Figure 6 In the illustrated embodiment, each unit cell 4 contains three types of sheet-like sound-absorbing materials 41, 42, and 43 of different thicknesses.

[0029] In a preferred embodiment, each sheet-like sound-absorbing element has a plurality of sound-absorbing holes on its outer shell, with a hole diameter of 0.1 mm to 5 mm, preferably 2 mm to 3 mm; the perforation rate on the outer shell is 0.1% to 35%, preferably 20% to 30%. The outer shell is made of galvanized steel sheet, aluminum alloy sheet, or stainless steel sheet. The thickness of the sheet-like sound-absorbing element ranges from 50 mm to 200 mm, and the length ranges from 200 mm to 5000 mm.

[0030] When multiple silencing unit cells 2 are arranged periodically and parallelly along the width direction of the outer frame 1, the reference... Figure 1 and Figure 3 Each sheet-shaped sound absorber is fixedly connected to the upper and lower sides of the outer frame through its outer shell at both ends in the height direction. When the outer frame is high, each sheet-shaped sound absorber can be composed of multiple sheet-shaped sound absorbers vertically spliced ​​together, and reinforced with horizontal reinforcing plates or reinforcing ribs to prevent deflection or collapse.

[0031] When multiple sound-absorbing unit cells are arranged in parallel intervals along the height direction H of the outer frame 1, each sheet-like sound-absorbing body is fixedly connected to the left and right sides of the outer frame through the outer shell at both ends of its width direction.

[0032] A comparison of an existing single-thickness structure (200mm thick silencer) and a dual-cycle structure of this invention (i.e., each unit cell contains two sheet-like silencers of different thicknesses) at the same ventilation rate (50%) and silencer length (800mm), shows that the larger dimension thickness of the dual-cycle structure of this invention is 200mm and the smaller dimension is 50mm. The inter-sheet distance changes from 200mm in the comparative example to 125mm, resulting in a smaller spacing and a higher high-frequency cutoff frequency. Simulation comparison data of their silencer effects are shown in Table 1 below. Figure 7 From Table 1 and Figure 7 It can be seen that when the ventilation rate and the effective length of the silencer are the same (50% ventilation rate and effective length of 800mm), the white noise reduction of the dual-cycle silencer of this utility model is greater than that of the single-thickness plate silencer with a thickness of only 200mm.

[0033] Table 1 Simulation values ​​of a single thickness scale 1.2 3.8 11.4 15.9 23.3 28.9 13.7 7.1 10.2 Simulation values ​​of the dual-period structure of this utility model 1.3 4.4 13.5 19.3 18.4 13.7 7.1 4.3 6.5 The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications achieving the same or similar technical effects should be considered within the protection scope of the present invention.

Claims

1. A multi-period plate silencer, comprising an outer frame (1) and a plurality of silencer cells (2) disposed within the outer frame (1), characterized in that: Each of the silencing units (2) comprises two or more sheet-like silencing bodies of different thicknesses arranged at intervals; the plurality of silencing units (2) are periodically arranged at intervals along the height or width direction of the outer frame (1); each sheet-like silencing body of the same thickness corresponds to an arrangement spacing, so that the silencing bodies of all silencing units form two or more different arrangement periods in the height or width direction of the outer frame (1).

2. The multi-period plate silencer as described in claim 1, characterized in that: The depth direction of the outer frame (1) is the length extension direction of the sheet-like sound-absorbing body.

3. The multi-period plate silencer as described in claim 2, characterized in that: The plurality of silencing units (2) are arranged periodically at intervals along the width direction of the outer frame (1), the height direction of the outer frame (1) is the height direction of the sheet-like silencing body, and the thickness of the sheet-like silencing body is the dimension along the width direction of the outer frame (1).

4. The multi-period plate silencer as described in claim 2, characterized in that: The plurality of silencing units (2) are arranged periodically at intervals along the height direction of the outer frame (1), the width direction of the outer frame (1) is the width direction of the sheet-like silencing body, and the thickness of the sheet-like silencing body is the dimension along the height direction of the outer frame (1).

5. The multi-period plate silencer as described in claim 3 or 4, characterized in that: The sheet-like sound absorber includes a shell and a sound-absorbing material filled inside the shell.

6. The multi-period plate silencer as described in claim 5, characterized in that: The sheet-like sound-absorbing body also includes flow guides disposed on two opposite sides along its length.

7. The multi-cycle plate silencer as described in claim 6, characterized in that: The air deflector is semi-cylindrical in shape, and its diameter is the same as the thickness of the sheet-like sound absorber.

8. The multi-period plate silencer as described in claim 5, characterized in that: The outer shell of the sheet-like sound absorber is provided with a plurality of sound-absorbing holes with a diameter of 0.1mm to 5mm and a perforation rate of 0.1% to 35% on the outer shell.

9. The multi-period plate silencer as described in claim 8, characterized in that: The diameter of the sound-absorbing hole is 2mm to 3mm, and the perforation rate on the outer shell is 20% to 30%.

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