Impedance composite micropore silencer

Abstract

The utility model relates to the field of noise reduction, in particular to an impedance composite micropore silencer. The utility model provides an impedance composite micropore silencer which comprises an outer shell, an inner shell, an inner shell and an outer shell, the at least two first sound absorption assemblies are arranged in the first channel; and the at least one second sound absorption assembly is arranged in the first channel, and the at least one second sound absorption assembly is arranged between every two adjacent first sound absorption assemblies. The at least two first sound absorption assemblies and the at least one second sound absorption assembly are arranged in the outer shell, through cooperation of the first sound absorption assemblies and the second sound absorption assemblies, the device can absorb sound waves of different frequencies, the application range of the device is widened, meanwhile, noise reduction can be conducted on the sound waves for many times, and the sound absorption effect of the device is improved. And the guide plates are arranged on the two sides of the sound absorption plate, so that the resistance of the sound absorption unit to airflow can be reduced, and the pressure loss of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction, specifically to an impedance composite microporous silencer. Background Technology

[0002] A muffler is a device that blocks sound propagation while allowing airflow, and is an important measure for eliminating aerodynamic noise. Currently, the most mature exhaust mufflers can be divided into reactive and resistive mufflers. Resistive mufflers utilize resistive sound-absorbing materials attached to the rigid pipe wall through which sound waves propagate. They allow most high-frequency sound waves to enter the material, gradually dissipating them, making them effective for high-frequency noise. Reactive mufflers mainly use bypass resonant cavities in the pipe or abrupt changes in the pipe's area, exhibiting selectivity for different frequency sound waves. This causes sound waves to reflect and interfere within the pipe, making them more effective at attenuating low and mid-frequency noise. However, using either resistive or reactive mufflers alone cannot effectively eliminate different frequency bands of exhaust noise, significantly reducing the muffler's effectiveness and failing to achieve the desired results. Utility Model Content

[0003] To address the technical problem that resistive and reactive mufflers, when used alone, cannot effectively eliminate noise in different frequency bands of exhaust noise, thus greatly reducing the muffler's noise reduction effect, one objective of this utility model is to provide an impedance composite microporous muffler.

[0004] To achieve the above objectives, embodiments of this utility model provide an impedance composite microporous silencer, comprising:

[0005] The outer shell has a first channel inside;

[0006] At least two first sound-absorbing components are disposed within the first channel;

[0007] At least one second sound-absorbing component is disposed within the first channel, and the at least one second sound-absorbing component is disposed between two adjacent first sound-absorbing components.

[0008] In the above technical solution, the first sound-absorbing component includes:

[0009] Multiple sound-absorbing units are arranged radially at intervals within the first channel, and the multiple sound-absorbing units are arranged in parallel, with a sound-absorbing channel formed between two adjacent sound-absorbing units.

[0010] In the above technical solution, the sound-absorbing unit includes:

[0011] Two sound-absorbing panels are arranged in parallel, and the sound-absorbing panels are provided with multiple first through holes;

[0012] Two guide plates are respectively disposed on both sides of the two sound-absorbing plates, and the two ends of the guide plates are respectively connected to the two guide plates. Multiple second through holes are opened on the guide plates.

[0013] The two sound-absorbing panels and the two flow guides form a first sound-absorbing chamber.

[0014] In the above technical solution, the second sound-absorbing component includes:

[0015] An inner shell is disposed within the first channel, and a second channel is provided inside the inner shell;

[0016] The first partition is located within the second channel;

[0017] The second partition is disposed in the second channel, and the second partition and the first partition are arranged in parallel.

[0018] Multiple first cannulas penetrate the first partition;

[0019] Multiple second cannulas penetrate the second partition.

[0020] In the above technical solution, the inner shell is provided with a continuous second sound-absorbing chamber, and the side wall of the inner shell is provided with a plurality of third through holes communicating with the second sound-absorbing chamber.

[0021] In the above technical solution, both the first and second insertion tubes are provided with a continuous third sound-absorbing chamber, and both the first and second insertion tubes are provided with a plurality of fourth through holes communicating with the third sound-absorbing chamber on their side walls.

[0022] In the above technical solution, the thickness of the sound-absorbing plate, the guide plate, the inner shell, the first insertion tube, and the second insertion tube are all 0.2mm-2mm;

[0023] The perforation rate of the sound-absorbing plate, the flow guide plate, the inner shell, the first insertion tube, and the second insertion tube is 0.5%-1.5%.

[0024] The diameters of the first through hole, the second through hole, the third through hole, and the fourth through hole are 0.1mm-0.5mm.

[0025] In the above technical solution, the area of ​​the plurality of silencing channels is 50%-80% of the radial cross-sectional area of ​​the first channel.

[0026] In the above technical solution, the sum of the cross-sectional areas of the cores of the multiple first insertion tubes is 40%-80% of the radial cross-sectional area of ​​the second channel;

[0027] The sum of the cross-sectional areas of the cores of the multiple second cannulas is 40%–80% of the radial cross-sectional area of ​​the second channel.

[0028] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the sound-absorbing panel of this utility model, which is V-shaped.

[0032] Figure 3 This is an enlarged structural schematic diagram of point A of this utility model;

[0033] Figure 4 This is a schematic diagram of the overall cross-sectional structure of the sound-absorbing panel of this utility model, which is of the oblique plate type;

[0034] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0035] 1. Outer shell; 2. Noise-absorbing channel; 3. Sound-absorbing plate; 4. Guide plate; 5. Inner shell; 6. First partition; 7. Second partition; 8. First insertion tube; 9. Second insertion tube; 10. First sound-absorbing chamber; 11. Second sound-absorbing chamber; 12. Third sound-absorbing chamber. Detailed Implementation

[0036] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] The following reference Figures 1 to 4 This invention describes some embodiments of an impedance composite microporous silencer.

[0039] like Figures 1 to 4As shown, an embodiment of this utility model provides an impedance composite microporous silencer, including a housing 1, at least two first sound-absorbing components and at least one second sound-absorbing component. This utility model takes two first sound-absorbing components and one second sound-absorbing component as an example.

[0040] Specifically, the outer shell 1 has a first channel inside; two first sound-absorbing components are respectively disposed at both ends of the first channel; a second sound-absorbing component is disposed inside the first channel, and the second sound-absorbing component is respectively disposed between the two first sound-absorbing components.

[0041] The two first sound-absorbing components are designated as First Sound-Absorbing Component No. 1 and First Sound-Absorbing Component No. 2. Both components have identical structures. When gas first passes through First Sound-Absorbing Component No. 1, some sound waves can enter it, effectively reducing noise. Subsequently, as the gas passes through Second Sound-Absorbing Component No. 2, the sudden change in the pipe cross-section causes a sudden change in acoustic impedance within the channel, altering the direction of sound wave propagation. This results in reflection and interference within the pipe, further reducing noise. The process from First Sound-Absorbing Component No. 1 to Second Sound-Absorbing Component No. 2 involves four acoustic impedance abrupt changes, significantly enhancing the sound absorption effect of Second Sound-Absorbing Component No. 2. Finally, when the airflow passes through Second Sound-Absorbing Component No. 2, it absorbs sound again. Through these six sound absorption processes, the device's sound absorption effect on the airflow is greatly improved. Furthermore, the entire device has a simple structure and low manufacturing cost.

[0042] like Figures 1 to 4 As shown, in one embodiment of this utility model, the first sound-absorbing component includes:

[0043] Multiple sound-absorbing units are disposed in the first channel. Both ends of each sound-absorbing unit are fixedly connected to the inner wall of the outer shell 1. The multiple sound-absorbing units are arranged in parallel, and a sound-absorbing channel 2 is formed between two adjacent sound-absorbing units.

[0044] The sound-absorbing unit includes:

[0045] Two sound-absorbing panels 3 are fixedly connected to the inner wall of the outer shell 1 at both ends. The two sound-absorbing panels 3 are arranged in parallel. Multiple first through holes are opened on the sound-absorbing panels 3. The cross-sectional shape of the sound-absorbing panels 3 is V-shaped or oblique plate-shaped.

[0046] Two guide plates 4 are respectively disposed on the side of the two sound-absorbing plates 3 near the second sound-absorbing component and the side away from the second sound-absorbing component. The two ends of the guide plates 4 are respectively fixedly connected to the two guide plates 4. Multiple second through holes are opened on the guide plates 4. The shape of the guide plates 4 is arc-shaped.

[0047] Two sound-absorbing panels 3 and two guide plates 4 form a first sound-absorbing chamber 10, and both the first through hole and the second through hole are connected to the first sound-absorbing chamber 10. According to existing technology, the farther apart the two sound-absorbing panels 3 are within the same sound-absorbing unit, the better the sound absorption effect for low-frequency sound waves; conversely, the closer the two sound-absorbing panels 3 are, the better the sound absorption effect for high-frequency sound waves. Therefore, to expand the sound absorption range of the sound-absorbing unit, the distance between the sound-absorbing panels 3 within multiple sound-absorbing units can be varied according to actual usage, thereby increasing the sound absorption range of multiple sound-absorbing units. For absorbing high-frequency sound waves, the distance between the sound-absorbing panels 3 within the same sound-absorbing unit is 20mm-60mm; for absorbing mid-frequency sound waves, the distance is 40mm-20mm; and for absorbing low-frequency sound waves, the distance is 200mm-800mm.

[0048] The second sound-absorbing component includes:

[0049] The inner shell 5 is disposed within the first channel, and the inner shell 5 has a second channel inside it;

[0050] The first partition 6 is located at one end of the second channel. The first partition 6 is fixedly connected to the inner wall of the inner shell 5 and seals one end of the second channel.

[0051] The second partition 7 is located at the other end of the second channel. The second partition 7 is fixedly connected to the inner wall of the inner shell 5 and seals the other end of the second channel. The second partition 7 and the first partition 6 are arranged in parallel. According to the prior art, the smaller the distance between the first partition 6 and the second partition 7, the better the sound absorption effect for high-frequency sound waves. The larger the distance between the first partition 6 and the second partition 7, the better the sound absorption effect for low-frequency sound waves. Therefore, in use, the distance between the first partition 6 and the second partition 7 is determined according to the actual use requirements.

[0052] Multiple first insertion tubes 8 penetrate the first partition 6;

[0053] Multiple second insertion tubes 9 penetrate the second partition 7; both the first insertion tube 8 and the second insertion tube 9 have a core, which is a hollow structure of the first insertion tube 8 and the second insertion tube 9, providing a channel for airflow.

[0054] It should be noted that the sound-absorbing unit inside the first sound-absorbing component is the first sound-absorbing unit, and the sound-absorbing unit inside the second sound-absorbing component is the second sound-absorbing unit. Since multiple first sound-absorbing units are spaced apart on the same horizontal plane, and multiple second sound-absorbing units are spaced apart on the same horizontal plane, a first silencing channel 2 is formed between two adjacent first sound-absorbing units, and a second silencing channel 2 is formed between two adjacent second sound-absorbing units. A first gap is left between the multiple first silencing units and the first partition 6, thus the multiple first silencing units, the inner wall of the outer shell 1, and the first partition 6 form a first cavity. A second gap is left between the multiple second sound-absorbing units and the second partition 7, thus the multiple second sound-absorbing units, the inner wall of the outer shell 1, and the second partition 7 form a second cavity. A third gap is left between the first partition 6 and the second partition 7, thus the first partition 6, the second partition 7, and the inner wall of the inner shell 5 form a third cavity. The two ends of multiple first intubation tubes 8 are respectively inserted into cavity 1 and cavity 3, and the two ends of multiple second intubation tubes 9 are respectively inserted into cavity 2 and cavity 3.

[0055] The two ends of the first tube 8 are inserted into cavity one and cavity three, respectively, thus forming a tube-type silencer that can induce two abrupt changes in acoustic impedance for sound waves. The two ends of the second tube 9 are inserted into cavity two and cavity three, respectively, thus forming a tube-type silencer that can induce two abrupt changes in acoustic impedance for sound waves. Because single-section silencers have many drawbacks in terms of passing frequencies, this invention employs a method of connecting cavity one, cavity two, and cavity three in series to eliminate passing frequencies. The length of the first cannula 8 extending into the first cavity is 25% of the length of the first gap, which can eliminate even multiples of the wavelength passing through. The length of the first cannula 8 extending into the third cavity is 50% of the length of the third gap, which can eliminate odd multiples of the wavelength passing through. The length of the second cannula 9 extending into the third cavity is 25% of the length of the third gap, which can eliminate even multiples of the wavelength passing through. The length of the second cannula 9 extending into the second cavity is 25% of the length of the second gap, which can eliminate odd multiples of the wavelength passing through.

[0056] When the airflow passes through the first silencing channel 2, part of the airflow will hit the side of the sound-absorbing plate 3 away from the first partition 6. Then the sound wave will pass through the first through hole and enter the first sound-absorbing chamber 10. Since the perforation rate of the first through hole on the sound-absorbing plate 3 is 0.5%-1.5% and the aperture of the first through hole is 0.1mm-0.5mm, the first through hole is an ultra-micro hole. Therefore, when the sound wave passes through the first through hole and enters the first sound-absorbing chamber 10, the first through hole will resonate and absorb the sound wave. Thus, the first through hole can absorb the sound wave.

[0057] At the same time, the airflow will also impact the guide plate 4, which has a second through hole. The sound wave will pass through the second through hole and enter the first sound absorption chamber 10. The perforation rate of the second through hole on the guide plate 4 is 0.5%-1.5%, and the diameter of the second through hole is 0.1mm-0.5mm. Therefore, during the process of the sound wave passing through the second through hole, the second through hole will resonate and absorb the sound wave, thereby absorbing the sound wave and further improving the sound absorption effect of the first sound absorption chamber 10.

[0058] Because the guide plate 4 is arc-shaped, when the airflow impacts the guide plate 4, the guide plate 4 can guide the airflow, directing it into the first silencing channel 2, thus reducing the resistance of the guide plate 4 to the airflow. When the cross-sectional shape of the sound-absorbing plate 3 is set to V-shape, the impact area between the sound-absorbing plate 3 and the airflow can be increased, further improving the sound absorption effect of the sound-absorbing plate 3 on the airflow. When the cross-sectional shape of the sound-absorbing plate 3 is set to oblique plate shape, the sound-absorbing plate 3 needs to be placed at an angle so that the sound-absorbing plate 3 forms a certain angle with the direction of airflow movement, thereby increasing the impact area between the sound-absorbing plate 3 and the airflow, and improving the sound absorption effect of the sound-absorbing plate 3 on the airflow.

[0059] When airflow enters the first silencing channel 2, the V-shaped cross-section of the sound-absorbing plate 3 causes the cross-section of the first silencing channel 2 to also become V-shaped, thus changing the direction of airflow. During this change, the airflow is blocked by the sound-absorbing plate 3, causing it to impact the surface of the sound-absorbing plate 3. The sound waves can then pass through the first through hole and enter the first sound-absorbing chamber 10 again, further improving the sound absorption effect of the first sound-absorbing chamber 10. When the cross-section of the sound-absorbing plate 3 is oblique, it forms an angle with the direction of airflow, which in turn causes the first silencing channel 2 to form an angle with the direction of airflow. This causes the airflow to change direction after entering the first silencing channel 2, impacting the sound-absorbing plate 3 on the adjacent sound-absorbing unit, further improving the sound absorption effect of the first sound-absorbing chamber 10.

[0060] Subsequently, the airflow enters the first cavity. Since both ends of the multiple first insertion tubes 8 penetrate the first partition 6 and extend into the first and third cavities respectively, when the airflow passes through the first insertion tube 8 extending into the first cavity, the acoustic impedance undergoes a first abrupt change due to the reactive silencer principle. This generates sound wave reflection and interference, reducing the sound energy radiated outwards by the silencer and further improving the sound absorption effect of the device. After the airflow enters the interior of the first insertion tube 8, it exits from the end of the first insertion tube 8 extending into the third cavity, causing a second abrupt change in acoustic impedance, further improving the sound absorption effect of the device. After the airflow enters the third cavity, it enters the end of the second insertion tube 9 extending into the third cavity, causing a third abrupt change in acoustic impedance, further improving the sound absorption effect of the device. After the airflow enters the second insertion tube 9, it exits from the end of the second insertion tube 9 extending into the second cavity, causing a fourth abrupt change in acoustic impedance, further improving the sound absorption effect of the device.

[0061] After the airflow enters the second cavity, part of the airflow will collide with the second sound-absorbing unit, and the other part of the airflow will pass through the second silencing channel 2 and be discharged outward. Since the second sound-absorbing unit and the first sound-absorbing unit have the same structure, and the second silencing channel 2 and the first silencing channel 2 have the same structure, the sound absorption principle is also the same. Therefore, the principle of the second sound-absorbing unit and the second silencing channel 2 will not be elaborated on here.

[0062] The entire device consists of only an outer shell 1, an inner shell 5, multiple sound-absorbing units, a first partition 6, a second partition 7, multiple first insertion tubes 8, and multiple second insertion tubes 9. The structure is relatively simple and can absorb airflow multiple times, which greatly improves the sound absorption effect of the device.

[0063] The guide plate 4 and the sound-absorbing plate 3 inside the sound-absorbing unit are integrally molded and can be made using the same mold, reducing the manufacturing difficulty of the sound-absorbing unit.

[0064] like Figure 1 and Figure 3 As shown, in one embodiment of the present invention, the inner shell 5 is provided with a continuous second sound-absorbing chamber 11, and the inner shell 5 is provided with a plurality of third through holes communicating with the second sound-absorbing chamber 11 on the side wall near the first partition 6.

[0065] When the airflow enters the third cavity, the sound waves pass through the third through-hole and enter the second sound-absorbing chamber 11. During this process, the third through-hole resonates and absorbs the sound waves, further improving the sound absorption effect. Since a larger thickness of the second sound-absorbing chamber 11 in the radial section of the first channel results in better absorption of low-frequency sound waves, and a smaller thickness results in better absorption of high-frequency sound waves, the principle here is the same as the principle of sound absorption at different frequencies based on the distance between the sound-absorbing panels 3 inside the same sound-absorbing unit. Therefore, it will not be elaborated further here. The thickness of the second sound-absorbing chamber 11 is determined according to actual usage requirements.

[0066] like Figure 1 and Figure 3 As shown, in one embodiment of the present invention, both the first insertion tube 8 and the second insertion tube 9 are provided with a continuous third sound-absorbing chamber 12, and both the first insertion tube 8 and the second insertion tube 9 are provided with a plurality of fourth through holes communicating with the third sound-absorbing chamber 12 on their side walls.

[0067] As the airflow passes through the first insertion tube 8 and the second insertion tube 9, the sound waves pass through the fourth through hole and enter the third sound-absorbing chamber 12. During this process, the fourth through hole resonates and absorbs the sound waves, further improving the sound absorption effect. Since a larger thickness of the third sound-absorbing chamber 12 in the radial section of the first channel results in better absorption of low-frequency sound waves, and a smaller thickness results in better absorption of high-frequency sound waves, the principle here is the same as the principle of sound absorption at different frequencies between the sound-absorbing panels 3 inside the same sound-absorbing unit, and will not be elaborated further here. The thickness of the third sound-absorbing chamber 12 is determined according to actual usage requirements.

[0068] like Figure 1 and Figure 3 As shown, in one embodiment of this utility model, the thickness of the sound-absorbing plate 3, the guide plate 4, the inner shell 5, the first insertion tube 8 and the second insertion tube 9 are all 0.2mm-2mm;

[0069] The perforation rate of the sound-absorbing plate 3, the flow guide plate 4, the inner shell 5, the first insertion tube 8, and the second insertion tube 9 is 0.5%-1.5%;

[0070] The diameters of the first through hole, the second through hole, the third through hole, and the fourth through hole are 0.1mm-0.5mm.

[0071] For example, a shell is selected, made of materials such as aluminum plate, galvanized plate, or stainless steel plate. The shell's length is 1100mm-1200mm, width is 400mm-500mm, and thickness is 50mm-120mm. The shell is constructed from front, rear, left, right, top, and bottom plates, each with a thickness of 0.2mm-2mm, forming a closed internal space. Multiple micropores are formed on the shell, with a perforation rate of 0.5%-1.5% and a pore size of 0.1mm-0.5mm. Twenty shells are selected and assembled into a large rectangular surface, placed in a reverberation chamber with a volume of 200-300m³. Sound waves of different frequencies are emitted within the reverberation chamber, and the sound absorption coefficients of the twenty shells are tested. The specific sound absorption coefficients are shown in the table below.

[0072]

[0073] Based on the experimental data above, the average sound absorption coefficient at 250Hz, 5000Hz, 10000Hz, and 20000Hz is greater than 0.8.

[0074] Furthermore, the sound-absorbing plate 3, the flow guide plate 4, the inner shell 5, the first insertion tube 8, and the second insertion tube 9 are all made of the same material as the experimental shell described above. The perforation rate and diameter of the first through hole on the sound-absorbing plate 3, the second through hole on the flow guide plate 4, the third through hole on the inner shell 5, and the fourth through hole on the first insertion tube 8 and the second insertion tube 9 are all the same as the perforation rate and diameter of the micropores on the experimental shell. The thickness of the sound-absorbing plate 3, the flow guide plate 4, the inner shell 5, the first insertion tube 8, and the second insertion tube 9 are also the same as the thickness of the sheet material used to fabricate the experimental shell, ensuring that the sound absorption coefficient of this invention is greater than 0.8.

[0075] like Figure 1 and Figure 2 As shown, in one embodiment of this utility model, the area of ​​the plurality of silencing channels 2 is 50%-80% of the radial cross-sectional area of ​​the first channel.

[0076] The sum of the cross-sectional areas of the multiple No. 1 silencers 2 in the radial direction of the first channel is 50%-80% of the radial cross-sectional area of ​​the first through hole. The specific percentage is determined according to the actual situation. This ensures that the ventilation performance of the No. 1 silencer 2 is maximized while ensuring normal sound absorption and reducing pressure loss of the equipment. The No. 2 silencer 2 is the same as the No. 1 silencer 2 and will not be described in detail.

[0077] like Figure 1 and Figure 4 As shown, in one embodiment of the present invention, the sum of the cross-sectional areas of the cores of the plurality of first insertion tubes 8 in the radial direction of the second channel is 40%-80% of the radial cross-sectional area of ​​the second channel;

[0078] The sum of the cross-sectional areas of the cores of the plurality of second cannulas 9 in the radial direction of the second channel is 40%–80% of the radial cross-sectional area of ​​the second channel.

[0079] According to existing technology, to ensure sound absorption by both the first insertion tube 8 and the second insertion tube 9, the smaller the percentage of the cross-sectional area of ​​the core of the first insertion tube 8 relative to the cross-sectional area of ​​the second channel, the better the sound absorption effect. Similarly, the smaller the percentage of the cross-sectional area of ​​the core of the second insertion tube 9 relative to the cross-sectional area of ​​the second channel, the better the sound absorption effect. Therefore, through the above structure, while ensuring normal airflow, the percentage of the cross-sectional area of ​​the core of the first insertion tube 8 and the cross-sectional area of ​​the core of the second insertion tube 9 relative to the cross-sectional area of ​​the second channel is minimized. However, to ensure that the first insertion tube 8 and the second insertion tube 9 do not fail during use, the cross-sectional area of ​​the second channel is preferably 15-25 times that of the core of the first insertion tube 8, and the cross-sectional area of ​​the second channel is preferably 15-25 times that of the core of the second insertion tube 9.

[0080] This utility model has the following advantages:

[0081] 1. By providing at least two first sound-absorbing components and at least one second sound-absorbing component inside the outer casing 1, the device can absorb sound waves of different frequencies through the cooperation of the first and second sound-absorbing components, thereby improving the applicability of the device. At the same time, it can also reduce noise from the sound waves multiple times, thereby improving the sound absorption effect of the device.

[0082] 2. By providing guide plates 4 on both sides of the sound-absorbing plate 3, the resistance of the sound-absorbing unit to the airflow can be reduced, thereby reducing the pressure loss of the equipment.

[0083] In this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0084] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit 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 this utility model.

[0085] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is 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. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An impedance composite microporous silencer, characterized in that, include: The outer shell (1) has a first channel inside; At least two first sound-absorbing components are disposed within the first channel; At least one second sound-absorbing component is disposed within the first channel, and the at least one second sound-absorbing component is disposed between two adjacent first sound-absorbing components.

2. The impedance composite microporous silencer according to claim 1, characterized in that, The first sound-absorbing component includes: Multiple sound-absorbing units are arranged radially at intervals in the first channel, and the multiple sound-absorbing units are arranged in parallel, forming a sound-absorbing channel (2) between two adjacent sound-absorbing units.

3. The impedance composite microporous silencer according to claim 2, characterized in that, The sound-absorbing unit includes: Two sound-absorbing panels (3) are arranged in parallel, and the sound-absorbing panels (3) are provided with a plurality of first through holes; Two guide plates (4) are respectively disposed on both sides of the two sound-absorbing plates (3), and the two ends of the guide plates (4) are respectively connected to the two guide plates (4). Multiple second through holes are opened on the guide plates (4); The two sound-absorbing panels (3) and the two flow guides (4) form a first sound-absorbing chamber (10).

4. The impedance composite microporous silencer according to claim 3, characterized in that, The second sound-absorbing component includes: An inner shell (5) is disposed within the first channel, and a second channel is provided inside the inner shell (5); The first partition (6) is located in the second channel; The second partition (7) is disposed in the second channel, and the second partition (7) and the first partition (6) are arranged in parallel. Multiple first cannulas (8) penetrate the first partition (6); Multiple second cannulas (9) penetrate the second partition (7).

5. The impedance composite microporous silencer according to claim 4, characterized in that, The inner shell (5) has a continuous second sound-absorbing chamber (11), and the inner shell (5) has a plurality of third through holes communicating with the second sound-absorbing chamber (11) on its side wall.

6. The impedance composite microporous silencer according to claim 5, characterized in that, Both the first insertion tube (8) and the second insertion tube (9) are provided with a continuous third sound-absorbing chamber (12), and both the first insertion tube (8) and the second insertion tube (9) are provided with a plurality of fourth through holes communicating with the third sound-absorbing chamber (12).

7. The impedance composite microporous silencer according to claim 6, characterized in that, The thickness of the sound-absorbing plate (3), the flow guide plate (4), the inner shell (5), the first insertion tube (8) and the second insertion tube (9) are all 0.2mm-2mm; The perforation rate of the sound-absorbing plate (3), the flow guide plate (4), the inner shell (5), the first insertion tube (8), and the second insertion tube (9) is 0.5%-1.5%; The diameters of the first through hole, the second through hole, the third through hole, and the fourth through hole are 0.1mm-0.5mm.

8. The impedance composite microporous silencer according to claim 2, characterized in that, The area of ​​the plurality of silencing channels (2) is 50%-80% of the radial cross-sectional area of ​​the first channel.

9. The impedance composite microporous silencer according to claim 4, characterized in that, The sum of the cross-sectional areas of the cores of the multiple first insertion tubes (8) is 40%–80% of the radial cross-sectional area of ​​the second channel; The sum of the cross-sectional areas of the cores of the multiple second cannulas (9) is 40%–80% of the radial cross-sectional area of ​​the second channel.

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