Noise control unit, noise control module and range hood

Abstract

The invention relates to the field of range hood manufacturing, and provides a noise control unit, a noise control module and a range hood. The noise control unit comprises an acoustic black hole body and a plurality of baffles, and the acoustic black hole body is at least provided with a structure inner cavity with an opening in one end; the baffle plates are arranged in the structure inner cavity, the baffle plates are arranged at intervals along the central axis direction of the opening, the baffle plates are provided with through holes corresponding to the opening, and the diameters of the through holes are gradually reduced from the opening to the structure inner cavity. The noise reduction effect of the sound absorption cotton on low and medium frequency noise is improved under the condition that the thickness of the sound absorption cotton is small.

Description

Technical Field

[0001] The present invention relates to the technical field of range hood manufacturing, and in particular to a noise control unit, a noise control module and a range hood. Background Art

[0002] Range hoods can solve the problem of oil smoke diffusion during cooking in the kitchen and have become one of the essential appliances in the home. However, with the development of range hoods, the demand for range hoods has gone beyond the ability to absorb oil smoke. They are also required to have lower noise and smaller space.

[0003] In the relevant technical field, the most commonly used technical solution for range hood noise reduction is sound-absorbing cotton, which mainly reduces noise through thermal viscous dissipation. However, with the miniaturization of range hoods, the limited thickness of sound-absorbing cotton makes it difficult to effectively control the mid- and low-frequency noise of range hoods. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a noise control unit that improves the noise reduction effect of the sound-absorbing cotton on medium and low frequency noise at a relatively low thickness.

[0005] The present invention also provides a noise control module.

[0006] The present invention also provides a range hood.

[0007] According to the present invention, the noise control unit includes:

[0008] An acoustic black hole body, wherein the acoustic black hole body has at least one structural inner cavity with an opening at one end;

[0009] A plurality of baffles are provided in the inner cavity of the structure and are spaced apart along the central axis of the opening. The baffles are provided with through holes corresponding to the openings, and the diameter of the through holes is gradually reduced from the opening toward the inner cavity of the structure.

[0010] According to one embodiment of the present invention, the diameter of the through hole is linearly or exponentially decreasing from the opening toward the inner cavity of the structure.

[0011] According to one embodiment of the present invention, the noise control unit further includes a perforated plate, one end of the perforated plate is docked with the opening, and the other end passes through the through hole from the opening toward the inner cavity of the structure, the perforated plate is abutted against the baffle, and a plurality of groups of micro-perforations are provided on the perforated plate.

[0012] According to one embodiment of the present invention, the plurality of groups of micro-perforations are spaced apart from each other, and the micro-perforations are correspondingly arranged between two adjacent baffles.

[0013] According to one embodiment of the present invention, one end of the perforated plate facing away from the opening passes through the acoustic black hole body, and the end is open.

[0014] According to one embodiment of the present invention, the surface of the perforated plate facing away from the inner cavity of the structure is covered with an isolation cotton layer.

[0015] According to one embodiment of the present invention, the micro-perforations include circles, squares, triangles, diamonds or polygons.

[0016] The present invention further provides a noise control module, which includes at least two noise control units as described above, and the noise control units include:

[0017] An acoustic black hole body, wherein the acoustic black hole body has at least one structural inner cavity with an opening at one end;

[0018] A plurality of baffles are provided in the inner cavity of the structure and are spaced apart along the central axis of the opening. The baffles are provided with through holes corresponding to the openings, and the diameter of the through holes is gradually reduced from the opening toward the inner cavity of the structure.

[0019] According to one embodiment of the present invention, the noise control module includes at least two noise control units of different specifications.

[0020] According to one embodiment of the present invention, the noise control module has a guide surface, and the opening is opened on the guide surface.

[0021] The present invention also provides a range hood, which includes the noise control module described above.

[0022] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0023] This application utilizes a combination of a structural cavity and baffles within the acoustic black hole body. The baffles are spaced apart along the central axis of the opening, and the diameter of the through-holes in the baffles tapers from the opening toward the structural cavity. This helps guide sound waves into the structural cavity of the acoustic black hole body. As the sound waves enter the tapered through-holes, wavelength compression (i.e., shortening) is achieved. When the sound-absorbing unit is made of sound-absorbing cotton, mid- and low-frequency noise more easily interacts with the thinner sound-absorbing cotton to produce thermoviscous dissipation, thereby improving the noise reduction effect on mid- and low-frequency noise.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 1 is a schematic structural diagram of an embodiment of a noise control unit provided by an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Partial cross-sectional view of the noise control unit;

[0028] Figure 3 1 is a structural diagram of another embodiment of a noise control unit provided by an embodiment of the present invention;

[0029] Figure 4 yes Figure 3 Partial cross-sectional view of the noise control unit;

[0030] Figure 5 1 is a schematic structural diagram of an embodiment of a noise control module provided by an embodiment of the present invention;

[0031] Figure 6 1 is a schematic structural diagram of another embodiment of a noise control module provided by an embodiment of the present invention;

[0032] Figure 7 This is a structural diagram of an embodiment of a range hood provided by an embodiment of the present invention;

[0033] Figure 8 yes Figure 7 A cross-sectional view of an embodiment of a range hood;

[0034] Figure 9 yes Figure 7 A cross-sectional view of another embodiment of the range hood.

[0035] Reference numerals:

[0036] 10. Range hood;

[0037] 100, noise control module; 110, noise control unit; 111, acoustic black hole body; 111a, structural cavity; 111b, opening; 112, baffle; 112a, through hole; 113, perforated plate; 113a, microperforation; 113b, open mouth;

[0038] 200, range hood body;

[0039] 300, housing;

[0040] 400. Volute assembly. DETAILED DESCRIPTION

[0041] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0042] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and 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, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0044] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0045] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0046] Range hoods can solve the problem of oil smoke diffusion during cooking in the kitchen and have become one of the essential appliances in the home. However, with the development of range hoods, the demand for range hoods has gone beyond the ability to absorb oil smoke. They are also required to have lower noise and smaller space.

[0047] In the relevant technical field, the most commonly used technical solution for range hood noise reduction is sound-absorbing cotton, which mainly reduces noise through thermal viscous dissipation. However, with the miniaturization of range hoods, the limited thickness of sound-absorbing cotton makes it difficult to effectively control the mid- and low-frequency noise of range hoods.

[0048] The present invention provides a noise control unit, a noise control module and a range hood.

[0049] In the embodiment of the present invention, Figures 1 to 4 As shown, the noise control unit 110 includes an acoustic black hole body 111 and multiple baffles 112. The acoustic black hole body 111 has at least one structural inner cavity 111a with an opening 111b at one end; the baffles 112 are arranged in the structural inner cavity 111a, and the baffles 112 are arranged at intervals along the central axis direction of the opening 111b. The baffles 112 are provided with through holes 112a corresponding to the openings 111b, and the diameter of the through holes 112a is gradually reduced from the opening 111b toward the structural inner cavity 111a.

[0050] The acoustic black hole body 111 is the core part of the noise control unit 110. Its main function is to slow down the propagation speed of sound waves through its special structural cavity 111a, thereby enhancing the interaction between sound waves and sound-absorbing materials, thereby improving the noise reduction effect.

[0051] The opening 111b of the structural cavity 111a provides a channel for sound waves to enter the noise control unit 110 and start the absorption and attenuation process of the sound waves. The design of the opening 111b can affect the incident angle and path of the sound waves, thereby affecting the sound absorption performance.

[0052] Optionally, the openings 111b may be provided in different shapes and sizes as required, such as inclined or polygonal openings 111b, to change the way and angle of entry of sound waves, thereby optimizing the sound absorption effect.

[0053] The arrangement of the baffles 112 interrupts the propagation path of the sound waves, increases the number of times the sound waves collide with the baffles 112, enhances the absorption and scattering effects of the sound waves, and thus reduces the noise level.

[0054] Optionally, the baffles 112 are designed to have different shapes or materials, such as corrugated, porous, or sound-absorbing material-covered baffles 112 , to increase the interaction between the sound waves and the baffles 112 and improve the sound absorption effect.

[0055] Baffle 112 has a through hole 112a corresponding to opening 111b. The diameter of through hole 112a tapers from opening 111b toward the inner cavity 111a. It is understood that the diameter of the through hole on a single baffle can be constant, while the diameter of the through holes on multiple baffles can taper. The tapered design of through hole 112a guides sound waves into through hole 112a and gradually reduces their wavelength, thereby enhancing sound absorption.

[0056] Optionally, the density, size and shape of the through holes 112 a may be adjusted, such as by changing the layout of the through holes 112 a or adopting different tapered curve designs, so as to optimize the sound absorption performance and expand the applicable frequency range.

[0057] The design of the noise control unit 110 achieves wavelength compression and guidance of sound waves through the combined action of the acoustic black hole body 111 and the baffle 112. This mechanism makes it easier for sound waves to interact with and be absorbed by the sound-absorbing material, thereby improving the noise reduction effect.

[0058] The present application utilizes a combination of the structural inner cavity 111a of the acoustic black hole body 111 and the baffles 112. Since the baffles 112 are spaced apart along the central axis of the opening 111b, and the diameter of the through holes 112a on the baffles 112 is tapered from the opening 111b toward the structural inner cavity 111a, this helps guide sound waves into the structural inner cavity 111a of the acoustic black hole body 111. As the sound waves enter the tapered through holes 112a, wavelength compression is achieved, that is, the wavelength is shortened, making it easier for mid- and low-frequency noise to interact with the lower-thickness sound-absorbing cotton to produce thermal viscous dissipation, thereby improving the noise reduction effect on mid- and low-frequency noise.

[0059] Reference Figures 1 to 2According to one embodiment of the present invention, the diameter of the through hole 112a is set to decrease linearly or exponentially from the opening 111b toward the structural inner cavity 111a. It can be understood that when the diameter of the through hole 112a is set to decrease linearly from the opening 111b toward the structural inner cavity 111a, the diameter of the through hole 112a will gradually decrease at a uniform rate. This setting can effectively control the propagation and absorption of sound waves, so that the sound waves are compressed, attenuated and absorbed more quickly after entering the through hole 112a, thereby improving the sound absorption effect. When the diameter of the through hole 112a is set to decrease exponentially from the opening 111b toward the structural inner cavity 111a, the diameter of the through hole 112a will gradually decrease at an exponential rate. This setting can quickly reduce the diameter of the through hole 112a at the entrance of the through hole 112a, so that the sound waves are quickly blocked and scattered after entering the through hole 112a, increase the contact area between the sound waves and the surface of the baffle 112, and improve the sound absorption performance. By linearly or exponentially decreasing the diameter of through-hole 112a, the absorption process of sound waves can be more precisely controlled, the interaction between sound waves and baffle 112 can be enhanced, and the sound absorption effect can be enhanced. This design can optimize the propagation path of sound waves and reduce reflection and scattering of sound waves, thereby effectively reducing noise levels and providing better noise control effects.

[0060] Reference Figures 3 and 4 According to one embodiment of the present invention, the noise control unit 110 further includes a perforated plate 113. One end of the perforated plate 113 is docked with the opening 111b, and the other end passes through the through-hole 112a from the opening 111b toward the structural inner cavity 111a. The perforated plate 113 is abutted against the baffle 112, and a plurality of groups of micro-perforations 113a are provided on the perforated plate 113. It can be understood that the docking arrangement of one end of the perforated plate 113 with the opening 111b ensures that the sound waves can directly enter the interior of the perforated plate 113 and begin the process of being absorbed and controlled. The other end of the perforated plate 113 passes through the through-hole 112a from the opening 111b toward the structural inner cavity 111a, so that the sound waves continue to enter the structural inner cavity 111a after passing through the perforated plate 113 and are further compressed, absorbed and controlled. The perforated plate 113 is positioned in contact with the baffle 112, ensuring effective contact and interaction between sound waves and the baffle 112 after passing through the perforated plate 113, thereby enhancing sound absorption. The perforated plate 113 is provided with multiple groups of microperforations 113a, which increase the surface area of ​​the perforated plate 113 and the contact area between the sound waves and the perforated plate 113, thereby enhancing noise absorption and control.

[0061] Reference Figure 4According to one embodiment of the present invention, multiple groups of microperforations 113a are spaced apart from each other, and the microperforations 113a are correspondingly arranged between two adjacent baffles 112. It can be understood that the multiple groups of microperforations 113a are spaced apart from each other, and the microperforations 113a are located between the baffles 112. They can effectively guide sound waves into the deeper part of the structural cavity 111a, further promoting wavelength compression and sound absorption. At the same time, the spacing of the microperforations 113a and their corresponding relationship with the baffles 112 help to improve the uniform distribution and effective propagation of sound waves in the structural cavity 111a, thereby enhancing the sound absorption effect. Secondly, it also helps to reduce the reflection and interference of sound waves on the perforated plate 113, reducing unnecessary sound energy loss. By arranging the microperforations 113a between adjacent baffles 112, the space of the structural cavity 111a can be more effectively utilized, achieving more efficient noise control.

[0062] Reference Figure 4 According to one embodiment of the present invention, the end of the perforated plate 113 facing away from the opening 111b extends through the acoustic black hole body 111, and this end is open at 113b. It will be appreciated that the open end 113b of the perforated plate 113 facing away from the opening 111b allows sound waves to freely enter and exit. This promotes the diffusion and distribution of sound waves within the acoustic black hole body 111. Due to the open end 113b, sound waves can more easily penetrate deep into the acoustic black hole body 111, thereby achieving a more comprehensive sound absorption effect.

[0063] Of course, in other embodiments, the end of the perforated plate 113 facing away from the opening 111 b may also pass through the acoustic black hole body 111 , and the end is closed.

[0064] According to one embodiment of the present invention, the surface of the perforated plate 113 facing away from the structural inner cavity 111a is covered with an insulating cotton layer. It is understood that the noise control unit 110 is exposed to an environment containing oil smoke. If these oil smoke particles enter the structural inner cavity 111a, they will adhere to the perforated plate 113 and may clog the microperforations 113a, affecting the propagation of sound waves and the noise reduction effect. The presence of the insulating cotton layer can block the entry of oil smoke particles, keep the perforated plate 113 clean and the microperforations 113a unobstructed, thereby ensuring stable noise reduction performance.

[0065] According to one embodiment of the present invention, the microperforations 113a include circular, square, triangular, diamond, or polygonal shapes. It is understandable that microperforations 113a of different shapes have different scattering effects on sound waves, and the most suitable shape needs to be selected based on the target noise reduction frequency range. Circular microperforations 113a are relatively simple to manufacture and can provide good sound wave scattering effects. The edges of circular microperforations 113a are smooth and less likely to cause sound wave reflection and interference, which facilitates the smooth passage of sound waves into the acoustic black hole body 111. Square microperforations 113a, due to their sharper corners, may provide better sound wave scattering effects within a specific frequency range. In addition, square microperforations 113a can more easily form a regular grid when arranged, thereby facilitating manufacturing and installation. Triangular, diamond, or polygonal microperforations 113a can provide more complex sound wave scattering patterns. Their edges and angles vary widely, which can affect the propagation of sound waves within a wider frequency range. By properly designing the shapes of the micro-perforations 113a, the noise reduction effect of the noise control unit 110 can be further optimized. The micro-perforations 113a can be configured as needed and are not particularly limited here.

[0066] Reference Figure 5 and Figure 6 The present invention also proposes a noise reduction control module, which has at least two noise control units 110, and the noise control units 110 are arranged at intervals. The noise reduction control module can effectively control the noise in a larger area by arranging multiple noise control units 110 at intervals. Each unit is capable of suppressing noise of a specific frequency or direction, forming a noise reduction array as a whole, thereby improving the noise reduction effect. In addition, the number, arrangement and spacing of the noise control units 110 can be flexibly adjusted according to different application scenarios and noise characteristics. The modular design allows each noise control unit 110 to be replaced or maintained independently without the need for large-scale disassembly and repair of the entire system. This greatly reduces maintenance costs and time, and improves the reliability and service life of the system.

[0067] Reference Figure 5 According to one embodiment of the present invention, the noise control module 100 includes at least two noise control units 110 of different specifications. It is understood that the acoustic black hole units in the acoustic black hole module can have different parameters. The parameters of each acoustic black hole unit can also be different combinations of parameters. For example, the distance between the baffles 112 can be different. The aperture, height, and perforation rate of each through hole 112a can be different combinations to achieve different noise reduction effects. The distance between the baffles 112 can also be variable.

[0068] Reference Figure 5 and Figure 6According to one embodiment of the present invention, the noise control module 100 has a guide surface, and the opening 111b is opened on the guide surface. It can be understood that the design of the guide surface can make the noise more concentrated in a specific direction or area during the propagation process. By adjusting the angle and shape of the guide surface, the effective control of the noise propagation path can be achieved, making it easier for it to enter the noise control unit 110 for processing. By opening the opening 111b on the guide surface, the noise can be guided by the guide surface before entering the noise control unit 110, which is conducive to more precise control and processing of the noise. The design of the guide surface can also be adjusted according to actual needs to achieve the best noise reduction effect for noises of different types and intensities. The design of the guide surface makes the noise control module 100 more adaptable to different installation environments and usage scenarios. By adjusting the angle and position of the guide surface, it can be better adapted to the characteristics of the surrounding environment and achieve more effective noise reduction.

[0069] Reference Figures 7 to 9 The present invention also provides a range hood 10, which includes a range hood body 200, a volute assembly 400 arranged in the range hood body 200, and a shell for covering and protecting the volute assembly 400. In addition, at least one noise control module 100 is provided on the range hood body 200. Since the noise control module 100 is directly fixed on the range hood body 200 and the opening 111b is facing the noise source, it can capture the generated noise and process it in the first time, thereby achieving an efficient noise reduction effect. The modular design makes the range hood 10 easier to maintain and upgrade. If a noise control unit 110 fails or its performance degrades, it can be easily replaced or repaired without replacing the entire range hood 10. According to different noise types and intensities, noise control modules 100 of different specifications and quantities can be selected for combination to meet different noise reduction requirements. This flexibility enables the range hood 10 to adapt to various kitchen environments and usage scenarios.

[0070] Of course, in other embodiments, the range hood 10 may include two different types of noise control modules 100 , which are respectively arranged toward different or the same noise source, and this is not particularly limited here.

[0071] Finally, it should be noted that the above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A noise control unit, characterized in that: include: An acoustic black hole body, wherein the acoustic black hole body has at least one structural inner cavity with an opening at one end; A plurality of baffles are provided in the inner cavity of the structure and are spaced apart along the central axis of the opening. The baffles are provided with through holes corresponding to the openings, and the diameter of the through holes is gradually reduced from the opening toward the inner cavity of the structure.

2. The noise control unit according to claim 1, characterized in that: The diameter of the through hole is linearly or exponentially decreasing from the opening toward the inner cavity of the structure.

3. The noise control unit according to any one of claims 1 to 2, characterized in that: The noise control unit also includes a perforated plate, one end of which is connected to the opening, and the other end passes through the through hole from the opening toward the inner cavity of the structure. The perforated plate is connected to the baffle, and multiple groups of micro-perforations are formed on the perforated plate.

4. The noise control unit according to claim 3, characterized in that: The plurality of groups of micro-perforations are spaced apart from each other, and the micro-perforations are correspondingly arranged between two adjacent baffles.

5. The noise control unit according to claim 3, characterized in that: One end of the perforated plate facing away from the opening passes through the acoustic black hole body, and the end is open.

6. The noise control unit according to claim 3, characterized in that: The surface of the perforated plate on the side facing away from the inner cavity of the structure is covered with an isolation cotton layer.

7. The noise control unit according to claim 3, characterized in that: The micro-perforations are circular, square, triangular, diamond or polygonal.

8. A noise control module, characterized in that: The method comprises at least two noise control units according to any one of claims 1 to 7, wherein the noise control units are arranged side by side.

9. The noise control module according to claim 8, characterized in that: The noise control module includes at least two noise control units of different specifications.

10. The noise control module according to claim 8, characterized in that: The noise control module has a guide surface, and the opening is opened on the guide surface.

11. A range hood, characterized in that: It comprises a range hood body and at least one noise control module according to any one of claims 8 to 10, wherein the noise control module is fixedly arranged on the range hood body, and the opening is arranged toward the noise source.

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