Wideband noise reduction devices and electronic equipment

Abstract

This application provides a broadband noise reduction device and electronic device, belonging to the technical field of noise reduction equipment. The broadband noise reduction device includes an acoustic structural unit and a sound-absorbing structural unit. The acoustic structural unit has multiple arranged cavities, each with a connecting pipe extending out of the cavity and communicating with the outside. The sound-absorbing structural unit is connected in parallel with the acoustic structural unit and has multiple chambers, each chamber containing a sound-absorbing element. The broadband noise reduction device provided in this application utilizes the sound-absorbing structural unit for sound absorption and noise reduction, and further utilizes the acoustic structural unit to resonate and absorb sound waves, effectively ensuring noise reduction performance over a wide frequency range.

Description

Technical Field

[0001] This application relates to the field of noise reduction equipment technology, and in particular to a broadband noise reduction device and electronic equipment. Background Technology

[0002] As server computing and storage capabilities increase, the heat output of server modules, the degree of component integration, and the heat flux density of chips gradually increase. This leads to a greater number of cooling fans required, as well as increased fan speeds, resulting in higher noise levels. On one hand, fan noise propagates outwards, affecting the user experience of the server. On the other hand, fan noise can be transmitted to the hard drive casing. When the noise frequency is close to the natural vibration frequency of the hard drive's read / write arm or head, resonance occurs, causing large head track sway. Multiple unsuccessful track seeks will degrade the performance of the storage device (Input / Output Operations Per Second, IOPS), and in severe cases, may cause hard drive read / write failures.

[0003] In related technologies, noise is generally reduced by placing sound-absorbing materials inside the hard drive casing. However, most server noise is concentrated below 1500Hz, and the internal space of the server is very limited, making it difficult to achieve good noise reduction results using traditional sound-absorbing materials. Summary of the Invention

[0004] This application provides a broadband noise reduction device and electronic device to solve the technical problem of poor noise reduction effect of traditional sound-absorbing materials in related technologies.

[0005] On the one hand, this application provides a broadband noise reduction device, comprising:

[0006] An acoustic structural unit has multiple cavities arranged in a row, and each cavity is provided with a connecting pipe, one end of which extends out of the cavity and communicates with the outside.

[0007] A sound-absorbing structural unit is connected to the acoustic structural unit. The sound-absorbing structural unit has multiple chambers, and each chamber is provided with a sound-absorbing element.

[0008] In some possible implementations, a through hole is provided on one side of the cavity, one end of the connecting tube communicates with and is adapted to the through hole, and the other end of the connecting tube extends into the cavity; wherein, the through holes of multiple cavities are located on the same side.

[0009] In some possible implementations, at least two of the through holes have different cross-sectional dimensions; and / or, at least two of the connecting pipes extend into the cavity with different lengths; and / or, at least two of the cavities have different volumes.

[0010] In some possible implementations, the acoustic structural unit includes a shell body and a plurality of first partitions disposed within the shell body, the plurality of first partitions dividing the shell body to form a plurality of cavities;

[0011] The shell body is further provided with at least one second partition, which is located in the cavity to divide the cavity into a plurality of bent and continuous sub-cavities, and the connecting pipe is located in the first or last sub-cavity.

[0012] In some possible implementations, the end of the connecting tube extends along the direction of the cavity into an adjacent sub-cavity.

[0013] In some possible implementations, the cross-sectional shape of the connecting pipe is circular, polygonal, or petal-shaped; the longitudinal section of the connecting pipe is rectangular, trapezoidal, or wavy.

[0014] In some possible implementations, the sound-absorbing structural unit includes a base plate and a plurality of supporting vertical plates spaced apart on the base plate, with a supporting horizontal plate connecting adjacent supporting vertical plates. The base plate and the supporting vertical plates form a cavity to accommodate the sound-absorbing element, wherein the lengths and positions of adjacent supporting horizontal plates are different.

[0015] In some possible implementations, the sound-absorbing element comprises at least one of fiber, foam, or metal.

[0016] In some possible implementations, it also includes:

[0017] A protective plate is placed over the sound-absorbing structural unit. The protective plate has multiple spaced sound-permeable holes. A sound-permeable dustproof component is sandwiched between the protective plate and the sound-absorbing structural unit.

[0018] On the other hand, embodiments of this application also provide an electronic device, including a device body and the broadband noise reduction device described in any of the above claims.

[0019] The broadband noise reduction device and electronic device provided in this application include a sound-absorbing structural unit and a connected acoustic structural unit. The acoustic structural unit has multiple cavities arranged in a row. Each cavity is provided with a connecting pipe that extends out of the cavity and communicates with the outside. First, the sound-absorbing components of the sound-absorbing structural unit improve the mid-to-low frequency sound absorption performance. The parallel arrangement of the sound-absorbing structural unit and the acoustic structural unit further enhances the mid-to-low frequency sound absorption performance, thereby effectively ensuring the noise reduction effect in a wide mid-to-low frequency range. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] Figure 1 This is a schematic diagram of the overall structure of the broadband noise reduction device in the embodiments of this application;

[0022] Figure 2 for Figure 1 A schematic diagram of part of the internal structure of a medium-bandwidth noise reduction device;

[0023] Figure 3 for Figure 1 A schematic diagram of part of the internal structure of a medium-bandwidth noise reduction device;

[0024] Figure 4 This is a partial internal structure diagram of the broadband noise reduction device in another embodiment;

[0025] Figure 5 This is a partial internal structure diagram of the broadband noise reduction device in another embodiment;

[0026] Figure 6 This is a schematic diagram of the connecting pipe in the broadband noise reduction device according to an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of the structure of another connecting pipe in the broadband noise reduction device according to an embodiment of this application;

[0028] Figure 8 This is a schematic diagram of the structure of another connecting pipe in the broadband noise reduction device according to an embodiment of this application;

[0029] Figure 9 This is a schematic diagram of the structure of another connecting pipe in the broadband noise reduction device according to an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of the structure of another connecting pipe in the broadband noise reduction device according to an embodiment of this application;

[0031] Figure 11 This is a schematic diagram of the structure of another connecting pipe in the broadband noise reduction device according to an embodiment of this application;

[0032] Figure 12 This is a schematic diagram of the structure of the broadband noise reduction device with the protective plate installed in the embodiment of this application;

[0033] Figure 13 This is a schematic diagram of the assembly of the broadband noise reduction device in the electronic device in the embodiments of this application;

[0034] Figure 14 This is a graph showing the sound absorption coefficient of different sound-absorbing structures in the embodiments of this application.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments.

[0036] Explanation of reference numerals in the attached figures

[0037] 100. Acoustic structural unit; 101. Cavity; 1011. Sub-cavity; 102. Connecting pipe; 103. First partition; 104. Second partition; 105. Through hole;

[0038] 200. Sound-absorbing structural unit; 201. Base plate; 202. Supporting vertical plate; 203. Supporting horizontal plate; 204. Sound-absorbing component; 205. Protective plate; 206. Sound-permeable hole;

[0039] 300. Hard drive; 301. Case; 302. Fan; 303. Motherboard. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 this application.

[0043] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0044] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0045] As mentioned in the background section, high-intensity server noise can harm users' physical and mental health, and can also easily cause hard drive head misalignment, reduced read / write efficiency, write errors, sector failure, or even hard drive failure, server downtime, and incalculable losses. Therefore, it is necessary to control server noise.

[0046] Since the speed of server cooling fans varies with the cooling demand, it is necessary to set up a wide-bandgap sound-absorbing structure to reduce noise in the server. However, the space available for laying sound-absorbing materials inside the server is limited. Most server noise is concentrated below 1500Hz, and traditional porous sound-absorbing material noise reduction technology is difficult to achieve good noise reduction effect.

[0047] Based on the above description, one or more embodiments of this application provide a broadband noise reduction device and electronic device. The broadband noise reduction device is composed of a sound-absorbing structural unit and an acoustic structural unit connected in parallel. The sound-absorbing structural unit includes multiple sound-absorbing components divided by multiple supporting vertical plates and supporting horizontal plates. The acoustic structural unit has multiple arranged cavities. Each cavity is provided with a connecting pipe, which extends out of the cavity and communicates with the outside. First, the sound-absorbing components are divided by multiple supporting vertical plates and supporting horizontal plates to improve the mid-low frequency sound absorption performance of the sound-absorbing components. Then, the sound-absorbing structural unit and the acoustic structural unit are connected in parallel to further improve the mid-low frequency sound absorption performance, thereby effectively ensuring the noise reduction effect in a wide mid-low frequency range.

[0048] The embodiments of this application are described below with reference to the accompanying drawings.

[0049] like Figure 1 and Figure 2As shown, this application embodiment provides a broadband noise reduction device, including an acoustic structural unit 100 and a sound-absorbing structural unit 200. The acoustic structural unit 100 has a plurality of arranged cavities 101, and each cavity 101 is provided with a connecting pipe 102, which extends out of the cavity 101 and communicates with the outside. The sound-absorbing structural unit 200 is connected to the acoustic structural unit 100 and has a plurality of chambers, each chamber being provided with a sound-absorbing element 204.

[0050] As can be seen from the above description, the broadband noise reduction device provided in this application embodiment has a plurality of connecting pipes 102 respectively disposed in the acoustic structural unit 100 of the plurality of cavities 101. Each acoustic structural unit composed of the cavity 101 and the connecting pipe 102 has good single-frequency sound absorption performance at its Helmholtz resonant frequency. The sound-absorbing components 204 in the plurality of cavities of the acoustic structural unit are used for sound absorption and noise reduction. At the same time, the acoustic structural unit 100 can further resonate and absorb the frequencies that the sound-absorbing components 204 do not absorb, thereby effectively ensuring the noise reduction effect over a wide frequency range.

[0051] It should be noted that the "up" and "down" directions mentioned in the embodiments of this application are based on the position of the broadband noise reduction device after it is assembled into the electronic device, and will not be repeated in the following text.

[0052] like Figure 2 and Figure 3 As shown, in some embodiments, the acoustic structural unit 100 includes a shell body and a plurality of first partitions 103 disposed within the shell body, the plurality of first partitions 103 dividing the shell body to form a plurality of cavities 101.

[0053] For example, the shell body is a rectangular shell, which can be made of metal, high-strength plastic or other rigid materials. Specifically, the shell body is formed by an upper cover plate, a lower plate and side plates. The first partition 103 is arranged in the vertical direction. The upper end of the first partition 103 is fixedly connected to the upper cover plate and the lower end is fixedly connected to the lower plate. The number of first partitions 103 directly affects the number of cavities 101 in the shell body.

[0054] In this embodiment of the application, a through hole 105 is provided on one side of the cavity 101 in the acoustic structural unit 100, one end of the connecting pipe 102 is connected to the through hole 105 and adapted to the through hole 105, and the other end of the connecting pipe 102 extends into the cavity 101; wherein, the through holes 105 of multiple cavities 101 are located on the same side.

[0055] For example, through holes 105 of multiple cavities 101 are all provided on the upper cover plate, and the lower cover plate of the shell body is used for installation and connection with electronic equipment. In order to ensure the noise reduction effect of the acoustic structure unit 100, the connecting tube 102 and the cavity 101 should be seamlessly connected. For example, the end of the connecting tube 102 is connected to the upper cover plate by laser welding, or the connecting tube 102 and the upper cover plate are directly injection molded as one piece. This is only an example in the embodiments of this application.

[0056] The structure consisting of a cavity 101 and a connecting pipe 102 provides good single-frequency sound absorption. Multiple cavities 101 are used to achieve broadband sound absorption. Therefore, integrating multiple cavities 101 into a single housing saves overall space and makes the device more suitable for space-constrained electronic devices. Furthermore, the through holes 105 of the multiple cavities 101 are located on the same side, i.e., all through holes 105 are located on the top cover plate. This allows for standardized molds or manufacturing processes for the acoustic structure unit 100, eliminating the need to consider installation orientation and reducing production costs and manufacturing difficulty.

[0057] Furthermore, the opening cross-sectional dimensions of the at least two through holes 105 are different, and / or the lengths of the at least two connecting pipes 102 are different, and / or the volumes of the at least two cavities 101 are different; wherein, the cross-sectional dimensions of the through holes 105 are positively correlated with the sound absorption frequency to be reduced, the lengths of the connecting pipes 102 are negatively correlated with the sound absorption frequency to be reduced, and the volumes of the cavities 101 are negatively correlated with the sound absorption frequency to be reduced.

[0058] Here, the cavity 101 and the connecting pipe 102 together constitute a Helmholtz resonant sound-absorbing structure, and the cross-sectional dimensions of the through hole 105 are directly related to the resonant frequency and sound absorption performance of the acoustic structural unit 100.

[0059] The Helmholtz resonance sound-absorbing structure, formed by the cavity 101 and the connecting pipe 102, absorbs sound when Helmholtz resonance occurs. This structure generates a strong resonance effect at its Helmholtz resonance frequency. When the air column inside the connecting pipe 102 vibrates violently due to resonance, air molecules frequently rub against the pipe wall as they enter and exit the connecting pipe 102. This friction causes the velocity distribution of the air molecules to become uneven, generating heat. This heat is then converted into heat energy and dissipated, achieving the effect of sound absorption and noise reduction.

[0060] The formula for calculating the Helmholtz resonance frequency is as follows:

[0061]

[0062] Among them, f His the Helmholtz resonance frequency, c is the speed of sound, A is the cross-sectional area of ​​the through hole 105, V0 is the volume of the cavity 101, and L is the effective length of the connecting pipe 102 (including end correction).

[0063] According to the Helmholtz resonant frequency calculation formula, the area A of the through-hole 105 directly affects the resonant frequency and sound absorption performance. When the area A of the through-hole 105 decreases, the resonant frequency f... H Decrease; conversely, when the area A of the through hole 105 increases, the resonant frequency f decreases. H Increase. Therefore, by adjusting the cross-sectional area of ​​the through hole 105, the frequency of resonant sound absorption can be changed, making it more suitable for specific application scenarios.

[0064] The volume V0 of cavity 101 directly affects the resonant frequency and sound absorption performance of acoustic structural unit 100. When the volume V0 of cavity 101 decreases, the resonant frequency f... H Increase; conversely, when the volume V0 of cavity 101 increases, the resonant frequency f H This reduces the frequency of resonant sound absorption. Therefore, by adjusting the volume of cavity 101, the frequency of resonant sound absorption can be changed, making it more suitable for specific application scenarios.

[0065] Similarly, the effective length of the connecting pipe 102 relative to L directly affects the resonant frequency and sound absorption performance of the acoustic structural unit 100. When the effective length of the connecting pipe 102 relative to L is large, according to the above formula, the resonant frequency f H Reducing the effective length of the connecting pipe 102 relative to L will decrease the resonant frequency f. H Therefore, by adjusting the effective length of the connecting tube 102, the frequency of resonant sound absorption can be changed, making it more suitable for specific application scenarios.

[0066] By adjusting the area of ​​the through hole 105, the volume of the cavity 101, or the effective length of the connecting pipe 102, sound-absorbing structures with different absorption frequencies can be obtained. Multiple resonant structures composed of cavities 101 and connecting pipes 102 of different sizes are arranged in parallel, and the resulting acoustic structural unit 100 can achieve a wide-bandwidth sound absorption effect.

[0067] Meanwhile, since the area of ​​the through hole 105, the volume of the cavity 101, or the effective length of the connecting tube 102 can all be adjusted, the sound absorption results can be customized more flexibly and accurately according to the actual noise environment of the electronic equipment, and the noise reduction scheme can be optimized in a targeted manner to achieve more refined noise reduction control.

[0068] like Figure 4As shown, in some embodiments, at least one second partition 104 is also provided inside the shell body. The second partition 104 is located in the cavity 101 to divide the cavity 101 into a plurality of bent and continuous sub-cavities 1011. The connecting pipe 102 is located in the first or last sub-cavity 1011.

[0069] The height of the second partition 104 of the shell body is lower than that of the first partition 103. Generally, the second partition 104 is connected to the upper cover plate but not to the lower plate, or the second partition 104 is connected to the lower plate but not to the upper cover plate. The cavity 101 is formed into a labyrinth-shaped cavity through the second partition 104.

[0070] With the above configuration, the bent cavity 1011 design requires a longer transmission path for sound waves to pass through, increasing the propagation distance of sound waves within the cavity 101 and reducing the sound absorption frequency.

[0071] Furthermore, such as Figure 5 As shown, in some embodiments, the end of the connecting tube 102 extends along the direction of the cavity 101 into an adjacent sub-cavity 1011. The shape of the connecting tube 102 is adapted to the direction of the cavity 101, that is, the shape of the connecting tube 102 is also a labyrinthine bend. This design can extend the effective length of the connecting tube 102 and reduce the sound absorption frequency.

[0072] It should be noted that in some embodiments, two or more second partitions 104 are provided within a portion of the cavity 101. By providing a large number of second partitions 104, the cavity 101 forms a continuous cavity with undulating bends. This design can further extend the sound wave transmission path and reduce the sound absorption frequency. In some embodiments, when two or more second partitions 104 are provided within the cavity 101, the length of the connecting pipe 102 is also correspondingly bent and extended.

[0073] Furthermore, the cavity 101 that is divided into sub-cavities 1011 and the cavity 101 without the second partition 104 can be combined and set together, thereby precisely controlling the resonant frequency.

[0074] like Figures 6 to 11 As shown, in some embodiments, the cross-sectional shape of the connecting pipe 102 is circular, polygonal, or petal-shaped; the longitudinal section of the connecting pipe 102 is rectangular, trapezoidal, or wavy.

[0075] Here, cross section refers to... Figure 1 Taking the orientation shown as an example, the cross-section along the horizontal direction, the longitudinal section refers to the section along the horizontal direction. Figure 1Taking the orientation shown as an example, along the vertical cross-section, preferably, the cross-sectional shape of the connecting pipe 102 is petal-shaped, and the longitudinal cross-sectional shape is wavy. This design maximizes the contact and collision of sound waves within the connecting pipe 102, thus facilitating the conversion of sound energy into heat energy for dissipation. Considering the limitations of processing difficulty and manufacturing technology, a circular cross-sectional shape and a rectangular longitudinal cross-sectional shape for the connecting pipe 102 are easier to prepare and produce. By selecting different cross-sectional and longitudinal cross-sectional shapes, the acoustic performance, structural strength, and spatial adaptability of the connecting pipe 102 can be specifically optimized, achieving more efficient and flexible sound wave management and noise reduction effects.

[0076] like Figure 1 and Figure 2 As shown, in some embodiments, the sound-absorbing structural unit 200 is arranged in a direction away from the acoustic structural unit 100, thereby widening the sound absorption frequency band.

[0077] like Figure 2 As shown, the sound-absorbing structural unit 200 includes a base plate 201 and a plurality of supporting vertical plates 202 spaced apart on the base plate 201. A supporting horizontal plate 203 is connected between two adjacent supporting vertical plates 202. The base plate 201, the supporting vertical plates 202 and the supporting horizontal plate 203 together form a cavity for accommodating the sound-absorbing component 204. The two adjacent supporting horizontal plates 203 have different lengths in the y-direction and different positions in the z-direction, which delays the phase control of the reflected sound waves on the surface of each cavity and improves the low-frequency sound absorption performance of the sound-absorbing component 204.

[0078] The aforementioned base plate 201 and the lower plate of the acoustic structure unit 100 can be made of the same plate to reduce material costs and manufacturing process difficulty. Different chambers are formed by using the set support vertical plate 202 to separate them. The support horizontal plates 203 of different lengths and positions can effectively delay the phase control reflected sound waves of the sound-absorbing component 204 in each chamber, thereby improving the low-frequency sound absorption performance of the sound-absorbing component 204.

[0079] It should be noted that in this embodiment, some chambers are formed by the side plates of the acoustic structural unit 100, the bottom plate 201 of the sound-absorbing structural unit 200, and the supporting vertical plate 202, while some chambers are formed by the bottom plate 201 of the sound-absorbing structural unit 200 and the supporting vertical plate 202. It can also be seen that the size of the chambers is not absolutely limited.

[0080] The sound-absorbing component 204 can be made of materials such as organic fibers, inorganic fibers, foam, sound-absorbing metals or plaster, which will not be described in detail in the embodiments of this application.

[0081] As can be seen from the above description, by setting support plates 203 of different lengths and positions, the low-to-mid frequency sound absorption performance of the sound absorption structural unit 200 can be improved. By taking advantage of the easy-to-adjust sound absorption frequency band of the acoustic structural unit 100, combining the sound absorption structural unit 200 with the acoustic structural unit 100 can obtain a wideband noise reduction device with good low-to-mid frequency sound absorption performance.

[0082] like Figure 12 As shown, in some embodiments, the broadband noise reduction device further includes a protective plate 205, which covers the sound-absorbing structural unit 200. The protective plate 205 has a plurality of spaced sound-permeable holes 206, and a sound-permeable dustproof component is sandwiched between the protective plate 205 and the sound-absorbing structural unit 200.

[0083] The aforementioned protective plate 205 can be a rigid plate made of metal or polymer plastic. In some embodiments, sound-permeable holes 206 are provided on the protective plate 205 corresponding to the parts that directly contact the sound-absorbing component 204, so as to improve the sound absorption performance of the sound-absorbing structural unit 200 as much as possible. The protective plate 205 can protect the sound-absorbing component 204 from damage by external forces, and can also prevent the sound-absorbing component 204 from falling off the sound-absorbing structural unit 200.

[0084] The aforementioned sound-permeable and dustproof component can be made of materials that do not affect the transmission of sound waves, such as non-woven fabric, sound-permeable fabric, or glass fiber felt. The sound-permeable and dustproof component completely covers the sound-absorbing structural unit 200 to prevent external dust from entering the sound-absorbing component 204 through the protective plate 205.

[0085] Figure 14 The graph shows a comparison of the sound absorption coefficients of a traditional porous sound-absorbing material, a sound-absorbing structural unit 200, and a broadband noise reduction device in this embodiment. The traditional porous sound-absorbing material is polyurethane sound-absorbing cotton. The broadband noise reduction device includes an acoustic structural unit 100 and a sound-absorbing structural unit 200, and the total thickness of all three is 20 mm.

[0086] It can be seen that below 1500 Hz, the sound absorption coefficient of traditional porous sound-absorbing materials with a diameter of 20 mm is less than 0.6, and the sound absorption performance is poor. After adjusting the phase of each unit surface by using the sound-absorbing structural unit 200 composed of the supporting vertical plate 202 and the supporting horizontal plate 203 to divide the chamber, the sound absorption performance below 1500 Hz is improved. The broadband noise reduction device that combines the sound-absorbing structural unit 200 with the acoustic structural unit 100 in parallel further improves the sound absorption performance below 1500 Hz.

[0087] Another embodiment of this application provides an electronic device, including a device body and a broadband noise reduction device as described in any of the above embodiments.

[0088] Generally, electronic devices include, but are not limited to, servers, smart mobile devices, communication devices, smart home devices, medical devices, etc. The application scenarios for the broadband noise reduction device are not absolutely limited in this application embodiment.

[0089] For example, such as Figure 13 As shown, when the electronic device is a server, the server includes a hard drive 300, a casing 301, a cooling fan 302, and a motherboard 303, etc. A wideband noise reduction device is set between the fan 302 and the hard drive 300 to reduce the noise generated by the cooling fan 302 as much as possible. On the one hand, it reduces the noise radiated outward by the server and improves the user experience; on the other hand, it reduces the noise intensity reaching the hard drive 300 and reduces the hard drive failure rate.

[0090] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0091] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A broadband noise reduction device, characterized in that, include: The acoustic structural unit (100) has a plurality of cavities (101) arranged in a plurality of arrangement. Each cavity (101) is provided with a connecting pipe (102), one end of which extends out of the cavity (101) and communicates with the outside. A sound-absorbing structural unit (200) is connected to the acoustic structural unit (100). The sound-absorbing structural unit (200) has multiple chambers, and each chamber is provided with a sound-absorbing element (204).

2. The broadband noise reduction device according to claim 1, characterized in that, One side of the cavity (101) is provided with a through hole (105), one end of the connecting pipe (102) is connected to the through hole (105) and adapted to the through hole (105), and the other end of the connecting pipe (102) extends into the cavity (101); wherein, the through holes (105) of multiple cavities (101) are located on the same side.

3. The broadband noise reduction device according to claim 2, characterized in that, At least two of the through holes (105) have different cross-sectional dimensions; and / or, at least two of the connecting pipes (102) have different lengths; and / or, at least two of the cavities (101) have different volumes.

4. The broadband noise reduction device according to claim 1, characterized in that, The acoustic structural unit (100) includes a shell body and a plurality of first partitions (103) disposed within the shell body, the plurality of first partitions (103) dividing the shell body to form a plurality of cavities (101). The shell body is further provided with at least one second partition (104), which is located in the cavity (101) to divide the cavity (101) into a plurality of bent and continuous sub-cavities (1011), and the connecting pipe (102) is located in the first or last sub-cavity (1011).

5. The broadband noise reduction device according to claim 4, characterized in that, The end of the connecting pipe (102) extends along the direction of the cavity (101) into the adjacent sub-cavity (1011).

6. The broadband noise reduction device according to claim 1, characterized in that, The cross-sectional shape of the connecting pipe (102) is circular, polygonal, or petal-shaped; the longitudinal section of the connecting pipe (102) is rectangular, trapezoidal, or wavy.

7. The broadband noise reduction device according to any one of claims 1 to 6, characterized in that, The sound-absorbing structural unit (200) includes a base plate (201) and a plurality of supporting vertical plates (202) spaced apart on the base plate (201). A supporting horizontal plate (203) is connected between two adjacent supporting vertical plates (202). The base plate (201) and the supporting vertical plates (202) form a cavity for accommodating the sound-absorbing component (204). The lengths and positions of two adjacent supporting horizontal plates (203) are different.

8. The broadband noise reduction device according to claim 7, characterized in that, The sound-absorbing element includes at least one of fiber, foam, or metal.

9. The broadband noise reduction device according to any one of claims 1 to 6, characterized in that, Also includes: A protective plate (205) is placed on the sound-absorbing structural unit (200). The protective plate (205) has a plurality of spaced sound-permeable holes (206). A sound-permeable dustproof component is sandwiched between the protective plate (205) and the sound-absorbing structural unit (200).

10. An electronic device, characterized in that, It includes the device body and the broadband noise reduction device as described in any one of claims 1 to 9.

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