A multi-cycle array muffler

Abstract

The utility model discloses a multi -cycle array formula muffler, including the outer frame (1) and the multiple muffling single cell (2) of fixed in the outer frame (1), its characterized in that: the cross section defined on the height and width direction of muffling single cell (2) in the outer frame (1) is periodic arrangement, and each muffling single cell (2) contains at least two different cross section size's muffling body, to form at least two kinds of periodic arrangement's muffling body spacing on the cross section, the muffling body extends along the airflow direction.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, specifically to a multi-period array 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 requirements of the airflow channel and reduce noise. This led to the development of array silencers.

[0003] An array-type silencer consists of multiple silencers arranged in a parallel and perpendicular array. Each silencer has the same thickness (maximum cross-sectional dimension), and the space between the individual cells forms the silencing channel. For this type of array-type silencer, the ventilation rate = airflow area ÷ total channel area. The airflow area is determined by the spacing between the silencers, and the total channel area equals the airflow area plus the area occupied by the silencers. Here, "area" is defined based on the cross-section perpendicular to the airflow direction. A thicker individual cell results in better low-frequency performance, but to maintain the same ventilation rate, the spacing between the silencers must also increase, leading to a lower high-frequency failure frequency, poorer high-frequency silencing effect, and increased space occupied by the silencer. To achieve the same silencing effect, the silencer length must be increased, resulting in increased material usage and further increased space.

[0004] Therefore, there is an urgent need to design a silencer that can ensure both low-frequency and high-frequency noise reduction effects under the same ventilation rate, while minimizing space occupation and material usage. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of existing technologies and provide an array-type silencer with higher space and material utilization efficiency and superior full-frequency noise reduction performance. Specifically, this invention proposes a multi-period array-type silencer, which integrates multiple silencers of different sizes and shapes within a single cell and optimizes their periodic arrangement. This improves both low-frequency and high-frequency noise reduction performance while maintaining the same ventilation rate, and reduces material usage and space occupation.

[0006] To achieve the above objectives, the present invention proposes the following technical solution: A multi-periodic array silencer includes an outer frame and a plurality of silencer cells fixed within the outer frame. The plurality of silencer cells are arranged in a periodic array on a cross-section defined by the height and width directions of the outer frame. Each silencer cell contains at least two silencers with different cross-sectional dimensions to form at least two periodic silencer spacings on the cross-section. The silencers extend along the airflow direction.

[0007] Furthermore, the sound-absorbing body includes a shell and a sound-absorbing material filled inside the shell.

[0008] Furthermore, the silencer also includes a flow guide fixed to both ends of the outer shell.

[0009] Furthermore, the fairing is configured as conical, tapered, or streamlined.

[0010] Furthermore, several sound-absorbing holes are formed on the outer shell.

[0011] Furthermore, the diameter of the silencing hole is 0.1mm to 5mm, and the opening ratio is 0.1% to 35%.

[0012] Furthermore, the outer frame is provided with a frame structure for installing the sound-absorbing body, and the end of the sound-absorbing body is connected and fixed to the frame structure.

[0013] Furthermore, the frame structure includes a square tube structure and a sound-absorbing connecting member. The square tube structure is fixedly connected to the frame of the outer frame, and the sound-absorbing connecting member is fixedly connected to the square tube structure.

[0014] Furthermore, the end of the muffler with a larger cross-sectional dimension is connected and fixed to the square tube structure, and the end of the muffler with a smaller cross-sectional dimension is connected and fixed to the muffler connecting member.

[0015] Furthermore, the maximum cross-sectional dimension of the silencer is 50mm~500mm, and the length is 200mm~5000mm.

[0016] The beneficial effects of this utility model's technical solution are reflected in the following: The multi-period array silencer of this utility model has its unit cells arranged in a periodic array on the cross-section of the outer frame. By setting at least two silencers with different cross-sectional dimensions within each unit cell, the cross-sectional dimensions of the silencers within the unit cell are differentiated, forming at least two types of periodic (multi-period) silencer spacing. Compared with existing array silencers with a single cross-sectional dimension, this multi-period array silencer with differentiated cross-sectional dimensions, because each unit cell contains at least two silencers with different cross-sectional shapes and sizes, increases the adjustable parameters under the same ventilation rate. Through the optimization and adjustment of multiple parameters, the optimized arrangement of silencers of different thicknesses can be achieved while maintaining the same ventilation rate. This ensures both low-frequency and high-frequency silencing effects simultaneously, while reducing material usage and space occupation.

[0017] Specifically, each unit cell contains multiple silencers, and the spacing between each silencer's periodic arrangement varies. Adjusting the spacing of each period allows for adjustment of the entire flow channel size. While maintaining ventilation efficiency, the flow channel spacing can be reduced, thereby increasing the high-frequency cutoff frequency and improving high-frequency performance. The silencers are effective across the entire frequency band. When high low-frequency requirements are needed, the thickness of the silencers can be increased to improve low-frequency noise reduction performance. However, if, as in existing technologies, only one type of silencer with a specific cross-sectional shape and size exists within each unit cell, increasing the silencer thickness necessitates increasing the spacing to maintain the same ventilation efficiency. The negative effect of increased spacing is a decrease in the high-frequency cutoff frequency, thus reducing high-frequency noise reduction performance. Achieving high-frequency control would then require extending the silencer length, ultimately increasing space and material usage. In contrast, this invention uses a combination of different cross-sectional sizes in its multi-period arrangement. While maintaining the same ventilation efficiency, it can use silencers with larger cross-sectional sizes to control low frequencies, and by combining large and small sizes to reduce spacing, it can improve performance across the entire frequency band while reducing material usage and space occupation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a multi-period array silencer (the frame structure for mounting the silencer is not shown) according to an embodiment of the present invention.

[0019] Figure 2 This is a single-cell schematic diagram of a multi-period array silencer according to an embodiment of the present invention.

[0020] Figure 3 yes Figure 1 The front view of the multi-cycle array silencer shown.

[0021] Figure 4 yes Figure 1 The diagram shows a top view of the unit cell arrangement of a multi-period array silencer.

[0022] Figure 5 yes Figure 1 The diagram shows the installation of the silencer body in a multi-period array silencer.

[0023] Figure 6 yes Figure 5 The front view of the multi-cycle array silencer shown.

[0024] Figure 7-1 This is a schematic diagram of the single-cell arrangement of a multi-period array silencer according to another embodiment of the present invention.

[0025] Figure 7-2 This is a single-cell schematic diagram of a multi-period array silencer according to another embodiment of the present invention.

[0026] Figure 8This is a simulation comparison of the noise reduction effect of the dual-cycle array silencer of this utility model embodiment and the existing single-thickness array silencer. Detailed Implementation

[0027] 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.

[0028] Please refer to this first. Figures 1 to 4 This utility model provides a multi-period array silencer, comprising: an outer frame 1, and a plurality of arrayed silencer cells 2 fixed within the outer frame 1. The silencer cells 2 are periodically arranged on the cross-section of the outer frame 1, and each silencer cell 2 contains at least two silencers with different cross-sectional dimensions. The silencers extend along the airflow direction. In this embodiment, each silencer is installed with its length direction perpendicular to the cross-section of the outer frame 1. In this utility model embodiment, since each cell contains at least two silencers with different cross-sectional dimensions, and the cells are periodically arrayed, each type of silencer corresponds to a periodic arrangement spacing, thus forming at least two spacings, referred to as "multi-period". The cross-section of the outer frame refers to the cross-section defined by its height and width directions.

[0029] Continue to refer to Figures 1 to 4In one exemplary embodiment, each unit cell 2 includes two silencers of different shapes and sizes: a first silencer 21 with a square cross-section and a larger cross-sectional dimension, and a second silencer 22 with a circular cross-section and a smaller cross-sectional dimension. The thickness of the first silencer 21 is its maximum cross-sectional dimension, and the thickness of the second silencer 22 is its diameter. This is merely an example; the cross-sectional shape of the first silencer 21 is not limited to a square, but can be circular, triangular, pentagonal, hexagonal, or other shapes. Similarly, the cross-sectional shape of the second silencer 21 is not limited to a circle, but can be square, triangular, pentagonal, hexagonal, or other shapes. The first silencers 21 are arranged according to a first spacing period, and the second silencers 22 are arranged according to a second spacing period. For example, when the cross-section of the muffler is a square, the thickness of the muffler is the side length of the square; when the cross-section of the muffler is a rectangle, the thickness of the muffler is the long side of the rectangle; when the cross-section of the muffler is a circle, the thickness of the muffler is the diameter of the circle; when the cross-section of the muffler is an ellipse, the thickness of the muffler is the major diameter (major axis) of the ellipse; when the cross-section of the muffler is a triangle, the thickness of the muffler is the length of the longest side of the triangle; when the cross-section of the muffler is another polygon, the thickness of the muffler is the distance between the two farthest points on the polygon.

[0030] The sound-absorbing body includes a shell and a resistive or reactive sound-absorbing material filled within the shell. In a preferred embodiment, such as... Figure 2 As shown, the first silencer 21 includes a shell 211, a sound-absorbing material filled in the cavity enclosed by the shell, and flow guides 212 fixed to both ends (both ends in the length direction) of the shell. The flow guides can be conical, tapered, or streamlined. Since the gas flow direction is the length extension direction of the silencer, the flow guides at both ends in the length extension direction can smoothly guide the airflow to the flow channel between the silencers and out of the flow channel between the silencers, avoiding a sudden contraction of the airflow at one end of the silencer, reducing the impact of the airflow on the pipe wall, and thus reducing pressure loss. In addition, sound-absorbing holes (not shown in the figure) can be opened on the side of the silencer shell. Preferably, the diameter of the sound-absorbing holes is 0.1mm~5mm, more preferably 2mm~3mm; the opening ratio is 0.1%~35%, more preferably 20%~30%, where the opening ratio refers to the proportion of the total area of ​​the sound-absorbing holes to the total area of ​​the side surface.

[0031] In one exemplary embodiment, the thickness (maximum cross-sectional dimension) of the silencer within the unit cell ranges from 50 mm to 500 mm, and the length ranges from 200 mm to 5000 mm. The silencer shell is made of galvanized steel sheet, aluminum alloy sheet, or stainless steel sheet.

[0032] refer to Figure 5 and Figure 6In the above embodiments, each silencer is installed and fixed inside the outer frame 1 by a frame structure component. This frame structure component includes a square tube structure component 3 and a silencer connecting component. The square tube structure component 3 is connected and fixed to the outer frame, and the silencer connecting component is connected and fixed to the square tube structure component 3. During installation, the ends of silencers with larger cross-sectional dimensions are connected and fixed to the square tube structure component, specifically by opening bolt holes on the guide shrouds at both ends. The ends of silencers with smaller cross-sectional dimensions are connected and fixed to the silencer connecting component, specifically by opening bolt holes on the guide shrouds at both ends of the silencer. Specifically, the square tube structure component 3 includes several vertical square tubes fixed along the height direction of the outer frame and at least one horizontal square tube fixed along the width direction of the outer frame. The several vertical square tubes are respectively connected and fixed to the horizontal square tube. The main function of the horizontal square tube is to reinforce the overall frame strength. The silencer connecting components include several X-shaped components 4 arranged in an array. Each X-shaped component 4 is connected between two adjacent vertical square tubes, and the four ends of the X-shaped component are fixed to the vertical square tubes. For example, each vertical square tube is fixed with a row of first silencers 21, and each X-shaped component 4 is fixed with a second silencer 22. The square tube structural components and X-shaped components can be fixed with bolts; each silencer can also be fixed with the corresponding square tube structural component and X-shaped component using bolts. The connection positions of the square tube structural components, silencer connecting components, and silencer ends are pre-designed to ensure that all components do not interfere with each other in three-dimensional space. The materials and cross-sectional dimensions of the square tube structural components and silencer connecting components are selected according to the overall structural strength and airflow load of the silencer to ensure the stability of the overall structure.

[0033] The arrangement of multiple silencers within a single cell can be flexibly adjusted as needed. In the aforementioned embodiment, the arrangement of two silencers within a single cell is as follows: Figure 2 As shown, the smaller cross-sectional silencer 22 is located at the upper right corner of the larger cross-sectional silencer 21. This is just an example; the silencer 22 can be located at other corners of the silencer 21, next to the midpoint of each side, or not at the midpoint. Adjustments can be made flexibly as needed in practice.

[0034] The cell thickness and spacing can be flexibly adjusted according to the requirements of noise reduction and ventilation rate. For example, given a ventilation rate, the spacing range can be adjusted according to the high-frequency cutoff frequency, and the maximum cross-sectional size of the silencer can be given according to the wavelength of the low-frequency control frequency.

[0035] In another embodiment, such as Figure 7-1 and Figure 7-2As shown, unit cell 2' contains three silencers: a large-sized silencer 21' with a square cross-section, a medium-sized silencer 22' with a square cross-section, and a small-sized silencer 23' with a circular cross-section, arranged in a triangle. Similarly, square tubes can be used to fix the two types of silencers with square cross-sections, and X-shaped members can be used to fix the silencers with circular cross-sections. For example, in two adjacent vertical square tubes, one vertical square tube fixes a row of silencers 21', and the other vertical square tube fixes a row of silencers 22'. The X-shaped member between these two vertical square tubes then fixes the silencers 23' in this row of unit cells.

[0036] The above are merely examples. A single cell may contain four, five, or even more sound-absorbing elements, and different designs may be made in terms of shape and / or cross-sectional dimensions. All of these are within the protection scope of this utility model.

[0037] Comparing an existing single-thickness (380mm) array silencer with a dual-cycle array silencer of this invention at the same ventilation rate (58%), and with a silencer body (pure porous cotton filling) length of 1000mm, the dual-cycle array silencer has a large-section silencer body thickness of 300mm and a small-section silencer body thickness of 50mm. The side length of the silencer body unit changes from 586mm in the single-thickness array silencer to 468mm in the dual-cycle array silencer. Correspondingly, the spacing decreases, and the high-frequency cutoff frequency increases. Simulation comparison data of their noise reduction effects are shown in Table 1 below. Figure 8 As shown in Table 1, when the ventilation rate and effective length are the same (58% ventilation rate, effective length of 1000mm), the white noise reduction of the dual-cycle array silencer of this utility model embodiment is greater than that of the silencer with only a single-thickness (380mm) silencer body. Moreover, except for the extremely low frequency (63Hz and 125Hz) performance which is almost unchanged, the performance is improved from 250Hz onwards, and the improvement is greater than 3 dB from 1000Hz onwards.

[0038] Table 1 Comparative examples of single-thickness structures - simulation values 1.5 4.0 8.6 14.4 16.7 10.9 6.2 3.8 5.7 Simulation values ​​of an embodiment of the dual-period structure of this utility model 1.1 3.4 9.0 15.8 21.3 22.3 11.6 5.5 8.5 Table 1 and Figure 8 The comparative data presented here compares an optimized dual-cycle array silencer with a traditional single-thickness array silencer under constraints of equal ventilation rate and effective length. This data aims to demonstrate that the multi-cycle design method provided by this invention has greater optimization potential and performance advantages, rather than implying that any multi-cycle structure is necessarily superior to any single-cycle structure.

[0039] 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, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, with identical performance or use, should be considered within the protection scope of the present invention.

Claims

1. A multi-period array silencer, comprising an outer frame (1) and a plurality of silencer cells (2) fixed within the outer frame (1), characterized in that: The plurality of silencing units (2) are arranged in a periodic array on the cross section defined by the height and width directions of the outer frame (1), and each silencing unit (2) contains at least two silencing bodies with different cross-sectional dimensions to form at least two periodic silencing body spacings on the cross section; the silencing bodies extend along the airflow direction.

2. The multi-period array silencer as described in claim 1, characterized in that: The sound-absorbing body includes a shell and a sound-absorbing material filled inside the shell.

3. The multi-period array silencer as described in claim 2, characterized in that: The silencer also includes a flow guide fixed to both ends of the outer shell.

4. The multi-period array silencer as described in claim 3, characterized in that: The fairing is configured as a cone shape, a tapered shape, or a streamlined shape.

5. The multi-period array silencer as described in claim 2, characterized in that: Several sound-absorbing holes are provided on the outer shell.

6. The multi-period array silencer as described in claim 5, characterized in that: The silencing hole has a diameter of 0.1mm to 5mm and an opening rate of 0.1% to 35%.

7. The multi-period array silencer as described in any one of claims 1 to 6, characterized in that: The outer frame (1) is provided with a frame structure for installing the sound-absorbing body, and the end of the sound-absorbing body is connected and fixed to the frame structure.

8. The multi-period array silencer as described in claim 7, characterized in that: The frame structure includes a square tube structure and a sound-absorbing connecting component. The square tube structure is fixedly connected to the frame of the outer frame, and the sound-absorbing connecting component is fixedly connected to the square tube structure.

9. The multi-period array silencer as described in claim 8, characterized in that: The end of the silencing body with a larger cross-sectional dimension is connected and fixed to the square tube structural component, and the end of the silencing body with a smaller cross-sectional dimension is connected and fixed to the silencing body connecting component.

10. The multi-period array silencer as described in claim 1, characterized in that: The maximum cross-sectional dimension of the sound-absorbing body is 50mm~500mm, and the length is 200mm~5000mm.

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