Noise control unit, noise control module and range hood

Abstract

The utility model 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, the acoustic black hole body is at least provided with a structure inner cavity with an opening at 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 utility model relates to the technical field of range hood manufacturing, 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 generated during cooking in the kitchen and have become one of the essential appliances in the home. With the development of range hoods, the demand for range hoods is no longer limited to the ability to absorb oil smoke, but also requires range hoods to have less noise and occupy less space.

[0003] In the relevant technical field, the most commonly used technical solution for range hood noise reduction is sound-absorbing cotton, and the main principle of noise reduction of sound-absorbing cotton is thermal viscosity dissipation. However, with the miniaturization design of range hoods, it is difficult for sound-absorbing cotton to effectively control the low- and medium-frequency noise of range hoods with limited thickness. Utility Model Content

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

[0005] The utility model also provides a noise control module.

[0006] The utility model also provides a range hood.

[0007] According to the utility model, the noise control unit comprises:

[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 arranged at intervals along the central axis direction 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 an 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 utility model, the noise control unit also includes a perforated plate, one end of the perforated plate 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 abutted against the baffle, and a plurality of groups of micro-perforations are provided on the perforated plate.

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

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

[0014] According to an embodiment of the utility model, 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.

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

[0016] The utility model also provides a noise control module, which includes at least two noise control units as described above, and the noise control unit includes:

[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 arranged at intervals along the central axis direction 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 an embodiment of the present invention, the noise control module includes at least two noise control units of different specifications.

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

[0021] The utility model also provides a range hood, which comprises the noise control module as described above.

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

[0023] The present application uses a combination of a structural inner cavity of an acoustic black hole body and a baffle, and since the baffles are arranged at intervals along the central axis of the opening, and the diameter of the through hole on the baffle is gradually set from the opening toward the structural inner cavity, it helps to guide the sound wave into the structural inner cavity of the acoustic black hole body. As the sound wave enters the gradually shrinking through hole, the wavelength is compressed, that is, the wavelength is shortened. When the sound absorbing unit is sound absorbing cotton, it makes it easier for the medium and low frequency noise to interact with the sound absorbing cotton of lower thickness to produce thermal viscous dissipation, thereby improving the noise reduction effect on the medium and low frequency noise.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the 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 utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0028] Figure 3 It is a structural schematic diagram of another embodiment of the noise control unit provided by the embodiment of the utility model;

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

[0030] Figure 5 It is a structural schematic diagram of an embodiment of a noise control module provided by an embodiment of the utility model;

[0031] Figure 6 It is a structural schematic diagram of another embodiment of the noise control module provided by the embodiment of the utility model;

[0032] Figure 7 It is a structural schematic diagram of an embodiment of a range hood provided by the utility model;

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

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

[0035] Reference numerals:

[0036] 10. Range hood;

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

[0038] 200, range hood body;

[0039] 300, housing;

[0040] 400. Volute assembly. DETAILED DESCRIPTION

[0041] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0042] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

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

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 utility model embodiment. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Range hoods can solve the problem of oil smoke diffusion generated during cooking in the kitchen and have become one of the essential appliances in the home. With the development of range hoods, the demand for range hoods is no longer limited to the ability to absorb oil smoke, but also requires range hoods to have less noise and occupy less space.

[0047] In the relevant technical field, the most commonly used technical solution for range hood noise reduction is sound-absorbing cotton, and the main principle of noise reduction of sound-absorbing cotton is thermal viscosity dissipation. However, with the miniaturization design of range hoods, it is difficult for sound-absorbing cotton to effectively control the low- and medium-frequency noise of range hoods with limited thickness.

[0048] The utility model provides a noise control unit, a noise control module and a range hood.

[0049] In the embodiment of the present utility model, Figures 1 to 4 As shown, the noise control unit 110 includes an acoustic black hole body 111 and a plurality of 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 inner cavity 111a provides a passage 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, so as 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 collisions between the sound waves and the baffles 112, and enhances the absorption and scattering effects of the sound waves, thereby reducing 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 , so as to increase the interaction between the sound waves and the baffles 112 and improve the sound absorption effect.

[0055] The baffle 112 is provided with a through hole 112a corresponding to the opening 111b, and the diameter of the through hole 112a is gradually reduced from the opening 111b toward the inner cavity 111a of the structure. It can be 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 is gradually reduced. The gradually reduced design of the through hole 112a can guide the sound wave into the through hole 112a and gradually reduce the wavelength, thereby increasing the sound absorption effect.

[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 the effect of compressing and guiding the wavelength of sound waves through the combined effect 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 combines the structural inner cavity 111a of the acoustic black hole body 111 and the baffle 112. Since the baffles 112 are arranged at intervals along the central axis direction of the opening 111b, and the diameter of the through hole 112a on the baffle 112 is gradually set from the opening 111b toward the structural inner cavity 111a, it helps to guide the sound wave into the structural inner cavity 111a of the acoustic black hole body 111. As the sound wave enters the gradually shrinking through hole 112a, the wavelength is compressed, that is, the wavelength is shortened, so that the medium and low frequency noise is more likely to interact with the lower thickness of the sound-absorbing cotton to produce thermal viscous dissipation, thereby improving the noise reduction effect on the medium and low frequency noise.

[0059] Reference Figure 1 to Figure 2According to one embodiment of the utility model, 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 speed. 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. Thus, by setting the diameter of the through hole 112a in a linear or exponential decreasing manner, the absorption process of the sound wave can be more accurately controlled, the interaction between the sound wave and the baffle 112 can be improved, and the sound absorption effect can be enhanced. This design can optimize the propagation path of the sound wave, reduce the reflection and scattering of the sound wave, thereby effectively reducing the noise level and providing a better noise control effect.

[0060] Reference Figure 3 to Figure 4 According to an embodiment of the utility model, the noise control unit 110 further includes a perforated plate 113, one end of the perforated plate 113 is butted against 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 butted 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 one end of the perforated plate 113 is butted against the opening 111b to ensure that the sound waves can directly enter 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 arranged in contact with the baffle plate 112, ensuring that the sound waves effectively contact and interact with the baffle plate 112 after passing through the perforated plate 113, thereby enhancing the absorption effect of the sound waves. The perforated plate 113 is provided with a plurality of groups of micro-perforations 113a, which can increase the surface area of ​​the perforated plate 113, increase the contact area between the sound waves and the perforated plate 113, and thus enhance the absorption and control effect of the noise.

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

[0062] Reference Figure 4 According to one embodiment of the utility model, one end of the perforated plate 113 facing away from the opening 111b penetrates the acoustic black hole body 111, and the end is set as an open opening 113b. It can be understood that the end of the perforated plate 113 facing away from the opening 111b is set as an open opening 113b, allowing sound waves to enter and exit freely. The diffusion and distribution of sound waves inside the acoustic black hole body 111 are promoted. Due to the open end 113b, sound waves can more easily enter the depth of 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 penetrate the acoustic black hole body 111 , and the end is closed.

[0064] According to one embodiment of the utility model, the surface of the perforated plate 113 on the side away from the structural inner cavity 111a is covered with an isolation cotton layer. It is understandable that the noise control unit 110 will be 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, which may block the micro-perforations 113a, affecting the propagation of sound waves and the noise reduction effect. The presence of the isolation cotton layer can block the entry of oil smoke particles, keep the perforated plate 113 clean and the micro-perforations 113a unobstructed, thereby ensuring the stability of the noise reduction performance.

[0065] According to one embodiment of the utility model, the microperforations 113a include circular, square, triangular, rhombus 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 according to the target noise reduction frequency range. The circular microperforations 113a are relatively simple to manufacture and can provide good sound wave scattering effects. The edges of the circular microperforations 113a are smooth, and it is not easy to produce reflection and interference of sound waves, which is conducive to the smooth passage of sound waves and entering the acoustic black hole body 111. The square microperforations 113a may provide better sound wave scattering effects within a specific frequency range because the square has sharper corners. In addition, the square microperforations 113a can more easily form a regular grid when arranged, thereby facilitating manufacturing and installation. Triangular, rhombus or polygonal microperforations 113a can provide more complex sound wave scattering patterns. Their edges and angles vary, which can affect the propagation of sound waves within a wider frequency range. By properly designing the micro-perforations 113a of these shapes, the noise reduction effect of the noise control unit 110 can be further optimized. The configuration can be made as required and is not particularly limited here.

[0066] Reference Figure 5 and Figure 6 The utility model 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 from each other. 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 can suppress 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 utility model, the noise control module 100 includes at least two noise control units 110 of different specifications. It is understandable that the acoustic black hole units on the acoustic black hole module can have different parameters. The parameters on each acoustic black hole unit can also be different parameter combinations, such as the distance between the baffle 112 is different. The aperture, hole height, perforation rate, etc. on each through hole 112a can be different combinations to achieve different noise reduction effects. The distance between the baffles 112 and the baffles 112 can be variable.

[0068] Reference Figure 5 and Figure 6According to an embodiment of the utility model, 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, effective control of the noise propagation path can be achieved, making it easier 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 accurate 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 utility model 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 arranged 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 at 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 deteriorates, 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 disposed toward different or the same noise source, and no special limitation is made herein.

[0071] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements 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 should be included in the scope of 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 arranged at intervals along the central axis direction 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 arranged at intervals 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 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, rhombus 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 with each other.

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 arranged on the guide surface.

11. A range hood, characterized in that: It comprises a range hood body and at least one noise control module as described in 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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