A rice-shaped baffle silencer

Abstract

The application discloses a kind of rice-shaped baffle mufflers, including micro-perforated panel resonance muffling structure and resistive sound-absorbing material, micro-perforated panel resonance muffling structure includes one or more micro-perforated panel resonance units in series, micro-perforated panel resonance unit includes micro-perforated panel, special-shaped baffle and panel, micro-perforated panel surrounds an internal cavity, special-shaped baffle includes cross baffle and four inclined baffles, cross baffle is divided into four quadrant spaces by internal cavity, and is further inclinedly divided into multiple resonance cavities by four inclined baffles, resonance cavity generates the continuous change of cavity depth along the length direction of micro-perforated panel, panel separates the internal cavity of adjacent micro-perforated panel resonance unit or shields the internal cavity located at the outermost side of muffler, resistive sound-absorbing material is connected in series on micro-perforated panel resonance muffling structure.The application greatly improves low-frequency muffling effect while ensuring that medium-high frequency muffling effect meets the requirements;Also can improve the applicability of different muffling frequencies by adjusting the internal structure of resonance structure.

Description

Technical Field

[0001] This invention relates to silencers, and more particularly to a type of cross-shaped baffle silencer. Background Technology

[0002] Traditional resistive silencers offer advantages such as good mid-frequency noise reduction performance and a wide mid-frequency noise reduction bandwidth. Their main structure consists of a perforated metal plate surface filled with resistive sound-absorbing materials like glass wool. Due to the good high-frequency sound absorption properties of these resistive materials, these silencers typically exhibit good mid-frequency noise reduction performance. However, limited by the low-frequency sound absorption of resistive materials, their low-frequency noise reduction performance is relatively weak. In practical applications, for noise sources with prominent low frequencies, current resistive silencers often fail to meet noise reduction requirements. Therefore, current resistive silencers suffer from insufficient low-frequency noise reduction and excessive mid-frequency noise reduction in actual use.

[0003] A low-frequency resonant silencer works by causing gas in the small aperture to reciprocate under the pressure of the sound wave when it reaches the resonant structure inside the silencer. Through friction and damping on the aperture wall, some of the sound energy is converted into heat energy and dissipated. Resonance occurs when the frequency of the incoming sound wave matches the natural frequency of the resonant sound-absorbing structure, at which point the absorbed sound energy reaches its maximum. In practical applications, the aperture diameter and plate thickness are fixed for ease of sample fabrication. When the aperture diameter and plate thickness are fixed, the resonant frequency of the structure can only be adjusted by the cavity depth. Traditional micro-perforated plate structures use a single cavity depth or air layer thickness for noise reduction per functional unit, resulting in a narrow bandwidth. Broadband noise reduction can only be achieved by connecting multiple functional units with single cavity depths or air layer thicknesses in series or parallel.

[0004] It should be noted that the information disclosed in the background section above is only for understanding the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The main objective of this invention is to overcome the deficiencies of the aforementioned background technology and provide a cross-shaped baffle silencer.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A type of cross-shaped baffle silencer includes a micro-perforated plate resonant silencing structure and a resistive sound-absorbing material. The micro-perforated plate resonant silencing structure includes one micro-perforated plate resonant unit or multiple micro-perforated plate resonant units connected in series. Each micro-perforated plate resonant unit includes a micro-perforated plate, a shaped baffle, and a panel. The micro-perforated plate forms an internal cavity. The shaped baffle includes a cross baffle and four inclined baffles. The cross baffle divides the internal cavity into four quadrants. The four inclined baffles further divide the four quadrants into multiple resonant cavities, causing a continuous change in cavity depth along the length of the micro-perforated plate. The panel is used to separate or shield the internal cavities of adjacent micro-perforated plate resonant units, with the inner cavity located on the outermost side of the silencer being the one in question. The resistive sound-absorbing material is connected in series with the micro-perforated plate resonant silencing structure.

[0008] Furthermore, the cross-shaped partition and the four inclined partitions are directly connected at the center of the internal cavity.

[0009] Furthermore, the micro-perforated plate forms a rectangular internal cavity, and the irregularly shaped partition divides the internal cavity into eight triangular resonant cavities.

[0010] Furthermore, the irregularly shaped partition also includes a central square hole partition, which forms a central square hole in the center of the internal cavity, and the cross partition and four inclined partitions are connected to the central square hole partition.

[0011] Furthermore, the micro-perforated plate forms a rectangular internal cavity, and the irregularly shaped partition divides the internal cavity into eight trapezoidal resonant cavities and one central square resonant cavity.

[0012] Furthermore, the microperforated plate has different pore sizes and / or different porosities in different regions corresponding to adjacent resonant cavities.

[0013] Furthermore, the multiple series-connected micro-perforated plate resonant units are evenly arranged along the length of the muffler.

[0014] Furthermore, it also includes a perforated plate covering the side of the resistive sound-absorbing material.

[0015] Furthermore, the silencer is an array silencer, which includes multiple silencer units arranged in an array at intervals, each silencer unit including a set of the micro-perforated plate resonant silencing structure and the resistive sound-absorbing material; or, the silencer is a plate silencer, which includes multiple silencer units arranged at intervals, each silencer unit including multiple silencer units stacked vertically, each silencer unit including a set of the micro-perforated plate resonant silencing structure and the resistive sound-absorbing material.

[0016] A micro-perforated plate resonant noise reduction structure includes one or more micro-perforated plate resonant units connected in series. Each micro-perforated plate resonant unit includes a micro-perforated plate, a shaped partition, and a panel. The micro-perforated plate forms an internal cavity. The shaped partition includes a cross-shaped partition and four inclined partitions. The cross-shaped partition is arranged in a cross shape, dividing the internal cavity into four quadrants. The four inclined partitions further divide the four quadrants into multiple resonant cavities, causing a continuous change in cavity depth along the length of the micro-perforated plate. The panel is used to separate or shield the inner cavities of adjacent micro-perforated plate resonant units, specifically the outermost inner cavity.

[0017] The present invention has the following beneficial effects:

[0018] This invention provides a micro-perforated plate resonant silencing structure with an internally shaped partition resembling a cross (or a star). The micro-perforated plate resonant unit comprises a micro-perforated plate, shaped partitions, and a panel. By inserting shaped partitions resembling a cross into the micro-perforated plate resonant silencing structure, the partitions divide the cavities within the same micro-perforated plate, allowing regions with different porosities and pore sizes to be connected in parallel. This results in a parallel structure of micro-perforated plates with continuously varying pore sizes, porosities, and cavity depths, achieving wideband noise reduction with a single functional unit. The silencer of this invention can be designed for the entire frequency range, and is particularly suitable for low-frequency noise control. By adjusting the unit cross-sectional dimensions of the silencing structure or the size of the square holes in the shaped partitions, the cavity depth of each resonant cavity within the silencer can be changed, allowing for adjustment of the resonant silencing frequency band according to requirements, overcoming the limitation of traditional resonant silencers with limited applicability.

[0019] The present invention also provides a sound-absorbing structure composed of a resonant sound-absorbing structure and a resistive sound-absorbing material. In this case, a resistive sound-absorbing material is added after the resonant unit of the micro-perforated plate to form a composite sound-absorbing structure. This can greatly improve the low-frequency sound-absorbing effect and broaden the sound-absorbing frequency band while ensuring that the sound-absorbing effect in the mid-to-high frequency range meets the requirements. In addition, the applicability of different sound-absorbing frequencies can be improved by adjusting the internal structure of the resonant structure.

[0020] The specific advantages of the embodiments of the present invention include:

[0021] 1. A frequency-adjustable composite noise reduction structure is provided. Each noise reduction unit includes a micro-perforated plate resonant noise reduction structure and a resistive sound-absorbing material. By designing the parameters of the micro-perforated plate resonant structure and the sound-absorbing material to match each other, a customized design can be made for different noise reduction needs. While ensuring that the noise reduction effect in the mid-to-high frequency range meets the requirements, the noise reduction effect in the low frequency range is effectively improved.

[0022] 2. The resonant silencing structure is composed of micro-perforated plate resonant units connected sequentially. Each unit consists of three parts: a micro-perforated plate, a shaped partition, and a panel. The surface of the unit is set according to whether it is in contact with the flow channel. The surface in contact with the flow channel is set as the micro-perforated plate, and the other surfaces are the panel. A partition is added to the cavity inside the unit. The partition and the micro-perforated plate are tightly fitted together. The units are separated by the panel. The addition of the shaped partition makes the cavity depth inside each micro-perforated plate change from a single or multiple finite fixed value in the traditional structure to a continuously varying value that increases from 0, thereby increasing the sound absorption area of ​​the structure and widening the corresponding silencing frequency range.

[0023] 3. The micro-perforated plate on the surface of the same resonant unit is divided into different regions by irregularly shaped partitions. The parallel structure of the micro-perforated plate can broaden the noise reduction frequency band. Adjusting the number and diameter of micro-holes in different regions can change the noise reduction frequency and noise reduction amount of the structure. A single functional unit can achieve broadband noise reduction.

[0024] 4. Changes in the cross-sectional dimensions of the silencing unit correspond to changes in the cavity depth range of the resonant cavity. This can adjust the silencing frequency band and modify the shape of the irregular partition. For example, setting a square hole at the centroid of the partition can also be used to change the cavity depth range.

[0025] 5. Arrange the resonant units of the micro-perforated plate evenly along the length direction. Increasing the number of resonant units can improve the noise reduction effect of the corresponding frequency of the structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the micro-perforated plate in the resonant unit of an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of a micro-perforated plate resonant unit with a cross-shaped partition inside, according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of a micro-perforated plate resonant unit with a square-hole irregular partition inside, according to an embodiment of the present invention.

[0029] Figure 4 This is a front view schematic diagram of a micro-perforated plate resonant unit in an embodiment of the present invention, which has an internal irregularly shaped partition without square holes and an irregularly shaped partition with square holes.

[0030] Figure 5 yes Figure 4 Enlarged views of resonant cavities A and B in the image;

[0031] Figure 6 These are schematic diagrams of two traditional micro-perforated plate resonant structures, one with a fixed cavity depth and the other with a discontinuous variable cavity depth.

[0032] Figure 7 This is a schematic diagram of the series combination of micro-perforated plate resonant units according to an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of a silencer unit composed of a micro-perforated plate combined resonant silencing structure and resistive sound-absorbing material according to an embodiment of the present invention (the surface of the sound-absorbing material is covered with a metal perforated plate).

[0034] Figure 9 This is a schematic diagram of an array muffler consisting of 9 muffler units according to an embodiment of the present invention;

[0035] Figure 10 This is a front view of an array muffler consisting of nine muffler units according to an embodiment of the present invention;

[0036] Figure 11 This is a schematic diagram of a plate-type muffler composed of 20 muffler units according to an embodiment of the present invention.

[0037] In the figure: 1-micro-perforated plate, 2-panel, 3-irregularly shaped partition without central square hole partition, 4-irregularly shaped partition with central square hole partition, 5-bottom surface of triangular hole resonant cavity, 6-bottom surface of trapezoidal hole resonant cavity, 7-resistive sound-absorbing material, 8-metal perforated plate. Detailed Implementation

[0038] The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0039] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] See Figures 1 to 5 as well as Figures 7 to 11 This invention provides a type of "rice-shaped" baffle silencer, comprising a micro-perforated plate resonant silencing structure and a resistive sound-absorbing material 7. The micro-perforated plate resonant silencing structure includes one micro-perforated plate resonant unit or multiple micro-perforated plate resonant units connected in series. Each micro-perforated plate resonant unit includes a micro-perforated plate 1, irregularly shaped baffles 3 and 4, and a panel 2. The micro-perforated plate 1 forms an internal cavity. The irregularly shaped baffles 3 and 4 include a cross-shaped baffle and four inclined baffles. The cross-shaped baffle divides the internal cavity into four quadrants, and the four inclined baffles further divide the four quadrants into multiple resonant cavities, resulting in a continuous change in cavity depth along the length of the micro-perforated plate 1 (see reference). Figure 5 The resonant cavity depth ranges from 0mm to Dc, with the intermediate value being Dm (where Dm is an infinite number of continuously varying values). The panel 2 is used to separate or shield the internal cavities of adjacent micro-perforated plate resonant units located on the outermost side of the silencer. The resistive sound-absorbing material 7 is connected in series on the micro-perforated plate resonant silencing structure.

[0043] See Figure 2 In a preferred embodiment, the cross-shaped partition and the four inclined partitions are directly connected at the center of the internal cavity.

[0044] like Figure 2 As shown, in a further preferred embodiment, the micro-perforated plate 1 forms a rectangular internal cavity, and the irregularly shaped partition 3 divides the internal cavity into 8 triangular resonant cavities.

[0045] See Figure 3 In a preferred embodiment, the irregularly shaped partition 4 further includes a central square hole partition, which forms a central square hole in the center of the internal cavity, and the cross partition and four inclined partitions are connected to the central square hole partition.

[0046] like Figure 3 As shown, in a further preferred embodiment, the micro-perforated plate 1 forms a rectangular internal cavity, and the irregularly shaped partition 4 divides the internal cavity into 8 trapezoidal hole resonant cavities and 1 central square hole resonant cavity.

[0047] See Figures 1 to 3In a preferred embodiment, the microperforated plate 1 has different pore sizes and / or different porosities in different regions corresponding to adjacent resonant cavities.

[0048] In comparison, Figure 6 The diagram shows two traditional microperforated plate resonant structures with fixed cavity depth and discontinuous variable cavity depth, respectively.

[0049] like Figure 7 As shown, in a preferred embodiment, the plurality of series-connected micro-perforated plate resonant units are uniformly arranged along the length of the muffler.

[0050] like Figure 8 As shown, in a preferred embodiment, a perforated plate, such as a metal perforated plate 8, is also included covering the side of the resistive sound-absorbing material 7.

[0051] like Figure 9 and Figure 10 As shown, in one embodiment, the muffler is an array muffler, which includes multiple muffler units arranged in an array at intervals. Each muffler unit includes a set of the micro-perforated plate resonant sound-absorbing structures and the resistive sound-absorbing material 7.

[0052] like Figure 11 As shown, in another embodiment, the silencer is a plate silencer, which includes multiple silencer units. The silencer units are arranged with spacing between them. Each silencer unit includes multiple silencer units stacked vertically. Each silencer unit includes a set of the micro-perforated plate resonant silencing structure and the resistive sound-absorbing material 7.

[0053] See also Figures 1 to 5 This invention also provides a micro-perforated plate resonant noise reduction structure, including one micro-perforated plate resonant unit or multiple micro-perforated plate resonant units connected in series. The micro-perforated plate resonant unit includes a micro-perforated plate 1, irregularly shaped partitions 3 and 4, and a panel 2. The micro-perforated plate 1 forms an internal cavity. The irregularly shaped partitions 3 and 4 include a cross-shaped partition and four inclined partitions. The cross-shaped partition is arranged in a cross shape, dividing the internal cavity into four quadrant spaces. The four inclined partitions further divide the four quadrant spaces obliquely into multiple resonant cavities, so that the resonant cavities produce a continuous change in cavity depth along the length direction of the micro-perforated plate 1. The panel 2 is used to separate or shield the internal cavities of adjacent micro-perforated plate resonant units.

[0054] The present invention provides a micro-perforated panel resonance muffling structure with a special-shaped partition inside having a shape similar to a cross. By inserting a special-shaped partition similar to a cross into the micro-perforated panel resonance muffling structure, the partition divides the cavity inside the same micro-perforated panel, enabling the parallel connection of regions with different porosity and pore diameters on the same panel. Eventually, a parallel structure of micro-perforated panels with different pore diameters, different porosities, and continuously varying cavity depths is formed, and a single functional unit can achieve broadband noise reduction. The muffler of the present invention can be designed for the entire frequency band and is particularly suitable for low-frequency noise control. By adjusting the unit cross-sectional size of the muffling structure or the size of the square holes in the special-shaped partition, the cavity depth of each resonance cavity inside the muffler can be changed, and the resonance muffling frequency band can be adjusted according to requirements, improving the drawback of the narrow applicable range of traditional resonance mufflers.

[0055] The present invention also provides a muffling structure composed of a resonance muffling structure and a resistive sound-absorbing material. Among them, a resistive sound-absorbing material is added behind the micro-perforated panel resonance unit to form a composite muffling structure, which can greatly improve the low-frequency muffling effect and broaden the muffling frequency band while ensuring that the mid-high frequency muffling effect meets the requirements; in addition, the applicability of different muffling frequencies can be improved by adjusting the internal structure of the resonance structure.

[0056] The following further describes specific embodiments of the present invention.

[0057] As Figures 1-4 shown, a micro-perforated panel resonance unit includes a micro-perforated panel 1, a panel 2, and internal partitions 3 or 4. The length of the micro-perforated panel 1 is L1, the width is W1, the thickness is t1, the perforation diameters are d1, d2 (taking the example of the micro-perforated panel 1 having two kinds of perforation diameters), the perforation rates are σ1, σ2, and the types of micropores on each micro-perforated panel can be increased according to needs. Combinations of different micropore diameters and perforation rates can change the resonance frequency of the structure, and setting multiple groups of micropores with different sizes and distributions on the same panel can broaden the muffling frequency band of the structure; the cross-sectional side length of the micro-perforated panel resonance unit is Lu, and Lu = L1; the panels 2 are placed on both sides of the unit, with a thickness of t2; the special-shaped partitions 3, 4 divide 8 regions inside the unit as the cavity of the micro-perforated panel resonance structure, the thickness of the partition is t3, and the side length of the square hole in the partition 4 is l1. Figure 5 shown Figure 4Two independent, complete micro-perforated plate resonant cavities, A and B, are separated by irregularly shaped partitions. The bottom surface 5 of resonant cavity A is located on the inclined partition, and the bottom surface 6 of resonant cavity B is located between the inclined partition and the central square-hole partition (the micro-perforated plate 1 is usually in contact with the airflow channel, and the opposite surface of the resonant cavity is the bottom surface of the cavity). The cavity depth ranges from 0 mm to Dc, with the intermediate value being Dm, which is an infinite number of continuously varying values. When the partition is an irregularly shaped partition 3 without square holes, the maximum cavity depth Dc = (Lu - t1 * 2 - t3) / 2. When the partition is an irregularly shaped partition 4 with square holes, Dc = (Lu - t1 * 2 - l1) / 2. Adjusting the value of the side length l1 of the square hole can change the cavity depth range, thereby changing the silencing frequency band of the structure. Figure 6 These are schematic diagrams of two traditional micro-perforated plate resonant structures. In general, the cavity depth of this structure is a fixed value D1. To broaden the frequency band, a common method is to set multiple cavity depth values ​​after the micro-perforated plate, such as single values ​​D1 and D2. However, due to the limited number of cavity depths, the frequency band broadening effect of this method is limited. In the practical application of the above embodiments of the present invention, the structural parameters of the four micro-perforated plates in the resonant unit can be set to be the same or different. By adjusting L1, W1, t1, d1, d2, σ1, σ2, and l1 of each plate, low-frequency noise reduction structures for different frequency noises are obtained.

[0058] like Figure 7 As shown, the micro-perforated plate resonant units are connected sequentially to obtain a combined resonant structure. The units are separated by the panel 2. Increasing the number of resonant unit groups n can improve the sound absorption effect.

[0059] like Figure 8 As shown, the resonant sound-absorbing structure is further combined with the resistive sound-absorbing material 7 in sequence. In this embodiment, the resonant structure consists of 7 sets of micro-perforated plate structures, and the resistive sound-absorbing material 7 is disposed inside the metal perforated plate 8. The length of the resistive sound-absorbing material 7 is L2 and the width is W2. Different L2 and W2 values ​​of the resistive sound-absorbing material correspond to different sound absorption effects and can be adjusted according to actual sound-absorbing needs.

[0060] By designing matching parameters for the micro-perforated plate resonant structure and the sound-absorbing material, customized designs can be made to meet different noise reduction needs, satisfy different usage scenarios, expand the noise reduction frequency band, and improve the applicability of the silencer.

[0061] like Figure 9 Figure 10 As shown, an array silencer is provided, which consists of an array of 9 silencer units. All four surfaces of the silencer units are micro-perforated plates. Each group of units has the same specific structure. The silencer units are fixed by a support rod (not shown in the figure). The support rod can be a rectangular steel pipe and can be installed vertically or horizontally. The support rod and the unit are connected by bolts and spring washers.

[0062] like Figure 11 As shown, a plate-type muffler is provided, wherein the surface of the muffler unit that contacts the flow channel is a micro-perforated plate, and the other surfaces are panels, and the specific structure of each group of units is the same.

[0063] The micro-perforated plate is made of steel plate, the front panel is made of metal plate, the internal partition is made of metal plate, the resistive sound-absorbing material is made of glass fiber cotton, and the perforated plate on the surface of the sound-absorbing material is made of metal perforated plate.

[0064] The advantages of the embodiments of the present invention include:

[0065] 1. A frequency-adjustable composite noise reduction structure is provided. Each noise reduction unit includes a micro-perforated plate resonant noise reduction structure and a resistive sound-absorbing material. By designing the parameters of the micro-perforated plate resonant structure and the sound-absorbing material to match each other, a customized design can be made for different noise reduction needs. While ensuring that the noise reduction effect in the mid-to-high frequency range meets the requirements, the noise reduction effect in the low frequency range is effectively improved.

[0066] 2. The resonant silencing structure is composed of micro-perforated plate resonant units connected sequentially. Each unit consists of three parts: a micro-perforated plate, a shaped partition, and a panel. The surface of the unit is set according to whether it is in contact with the flow channel. The surface in contact with the flow channel is set as the micro-perforated plate, and the other surfaces are the panel. A partition is added to the cavity inside the unit. The partition and the micro-perforated plate are tightly fitted together. The units are separated by the panel. The addition of the shaped partition makes the cavity depth inside each micro-perforated plate change from a single or multiple finite fixed value in the traditional structure to a continuously varying value that increases from 0, thereby increasing the sound absorption area of ​​the structure and widening the corresponding silencing frequency range.

[0067] 3. The micro-perforated plate on the surface of the same resonant unit is divided into different regions by irregularly shaped partitions. The parallel structure of the micro-perforated plate can broaden the noise reduction frequency band. Adjusting the number and diameter of micro-holes in different regions can change the noise reduction frequency and noise reduction amount of the structure. A single functional unit can achieve broadband noise reduction.

[0068] 4. Changes in the cross-sectional dimensions of the silencing unit correspond to changes in the cavity depth range of the resonant cavity. This can adjust the silencing frequency band and modify the shape of the irregular partition. For example, setting a square hole at the centroid of the partition can also be used to change the cavity depth range.

[0069] 5. Arrange the resonant units of the micro-perforated plate evenly along the length direction. Increasing the number of resonant units can improve the noise reduction effect of the corresponding frequency of the structure.

[0070] In summary, compared with previous silencers, the silencer of the present invention significantly improves the low-frequency noise reduction performance and broadens the noise reduction frequency band, and has obvious advantages compared with existing technical solutions.

[0071] The background section of this invention may include background information about the problems or environment in which the invention is being developed, and is not necessarily a description of prior art. Therefore, the content included in the background section does not constitute an admission of prior art by the applicant.

[0072] The above description provides a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and 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 substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A type of cross-shaped baffle silencer, characterized in that, The invention includes a micro-perforated plate resonant silencing structure and resistive sound-absorbing material. The micro-perforated plate resonant silencing structure comprises one or more micro-perforated plate resonant units connected in series. Each micro-perforated plate resonant unit includes a micro-perforated plate, shaped partitions, and a panel. The micro-perforated plate forms an internal cavity. The shaped partitions include a cross-shaped partition and four inclined partitions. The cross-shaped partition divides the internal cavity into four quadrants, and the four inclined partitions further divide the four quadrants into multiple resonant cavities, resulting in a continuous change in cavity depth along the length of the micro-perforated plate. The panel is used to separate adjacent micro-perforated plates. The internal cavity of the resonant unit separates or shields the internal cavity located on the outermost side of the muffler. The resistive sound-absorbing material is connected in series on the micro-perforated plate resonant silencing structure. The micro-perforated plate forms a rectangular internal cavity. The multiple series-connected micro-perforated plate resonant units are evenly arranged along the length of the muffler to form a rectangular long cavity with a constant cross section. The irregularly shaped partition also includes a central square hole partition. The central square hole partition forms a central square hole in the center of the internal cavity. The cross partition and four inclined partitions are connected to the central square hole partition. The irregularly shaped partition divides the rectangular internal cavity into eight trapezoidal hole resonant cavities and one central square hole resonant cavity.

2. The quasi-cross-shaped baffle silencer as described in claim 1, characterized in that, The microperforated plate has different pore sizes and / or different porosities in different regions corresponding to adjacent resonant cavities.

3. The quasi-cross-shaped baffle silencer as described in any one of claims 1 to 2, characterized in that, It also includes a micro-perforated plate covering the side of the resistive sound-absorbing material.

4. The quasi-cross-shaped baffle silencer as described in any one of claims 1 to 2, characterized in that, The silencer is an array silencer, which includes multiple silencer units arranged in an array at intervals. Each silencer unit includes a set of the micro-perforated plate resonant silencing structure and the resistive sound-absorbing material. Alternatively, the silencer is a plate silencer, which includes multiple silencer units arranged at intervals. Each silencer unit includes multiple silencer units stacked vertically. Each silencer unit includes a set of the micro-perforated plate resonant silencing structure and the resistive sound-absorbing material.

5. A micro-perforated plate resonant noise reduction structure, characterized in that, The device includes one or more micro-perforated plate resonant units connected in series. Each micro-perforated plate resonant unit comprises a micro-perforated plate, shaped partitions, and a panel. The micro-perforated plate forms an internal cavity. The shaped partitions include a cross-shaped partition and four inclined partitions. The cross-shaped partitions are arranged in a cross pattern, dividing the internal cavity into four quadrants. The four inclined partitions further divide the four quadrants into multiple resonant cavities, causing a continuous change in cavity depth along the length of the micro-perforated plate. The panel is used to separate adjacent micro-perforations. The internal cavity of the plate resonator unit separates or shields the outermost internal cavity; wherein, the micro-perforated plate forms a rectangular internal cavity, and the multiple series-connected micro-perforated plate resonator units are evenly arranged along the length of the muffler to form a rectangular long cavity with equal cross-section. The irregularly shaped partition also includes a central square hole partition, which forms a central square hole in the center of the internal cavity. The cross partition and four inclined partitions are connected to the central square hole partition. The irregularly shaped partition divides the rectangular internal cavity into eight trapezoidal hole resonator cavities and one central square hole resonator cavity.

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