Noise reduction device and range hood

Abstract

The utility model relates to the technical field of oil fume suction equipment, and provides a noise reduction device and a range hood, and the noise reduction device comprises a buffer layer, a reflecting layer and a sound absorption layer. Wherein the buffer layer is provided with a plurality of buffer holes, and a discontinuous surface is formed; the reflecting layer is provided with a bulge and a recess, and a transition plane is arranged between the bulge and the recess; the sound absorption layer is provided with a multi-gap sound absorption filler and is arranged between the buffer layer and the reflecting layer. According to the noise reduction device provided by the utility model, through a three-layer noise reduction structure, noise generates flow resistance on a discontinuous surface to realize primary noise reduction; noise enters the sound absorption layer to be absorbed, the noise resonates in the pores, sound energy is converted into heat energy, the sound energy is dissipated, and secondary noise reduction is achieved; the noise enters the reflecting layer, is reflected in a transition plane formed by the bulges and the recesses in the reflecting layer, enters the sound absorption layer again, and is absorbed by the sound absorption layer again, so that three-stage noise reduction is realized; noise can be reduced in multiple levels and multiple directions, and the sound absorption efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen exhaust equipment technology, specifically to a noise reduction device and a kitchen exhaust fan. Background Technology

[0002] A range hood, also known as a kitchen exhaust hood, is a kitchen appliance that purifies the kitchen environment. It is typically installed above the stove and quickly removes harmful fumes and grease produced during cooking, venting them outdoors. It also condenses and collects these fumes, reducing pollution and purifying the air, and provides safety features such as protection against toxic substances and explosions.

[0003] When a range hood is operating, the noise level is typically around 66-73 dB. This noise can negatively impact the user experience and, in severe cases, even affect the user's mood and physical health. Reducing the operating noise of range hoods is a key design focus for this type of product. Current methods generally involve optimizing fan parameters and using sound-absorbing materials to reduce noise.

[0004] However, in related noise reduction technologies, sound-absorbing materials can usually only reduce noise by converting sound energy into heat energy through sound vibration when noise penetrates the material itself. This often results in single-time, unidirectional sound absorption and low sound absorption efficiency. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the present invention provides a noise reduction device to solve at least one of the above-mentioned technical defects in the prior art. When reducing noise in a range hood, it can reduce noise in multiple layers and directions and improve sound absorption efficiency.

[0006] The second aspect of this utility model provides a range hood.

[0007] To achieve the objective of this utility model, a noise reduction device is provided, comprising:

[0008] The buffer layer has multiple buffer holes, forming a discontinuous surface.

[0009] A reflective layer having protrusions and depressions, with a transition plane between the protrusions and the depressions;

[0010] The sound-absorbing layer is provided with a porous sound-absorbing filler and is located between the buffer layer and the reflective layer.

[0011] Preferably, the sound-absorbing layer is polyester fiber or melamine foam with multiple pores.

[0012] Preferably, the incident angle between the transition plane and the sound source is 0° to 15° or 75° to 90°.

[0013] Preferably, the reflective layer is a smooth metal sheet, and the protrusions and depressions are formed by stamping.

[0014] Preferably, the protrusions and the depressions make the cross-section of the reflective layer serrated.

[0015] Preferably, the buffer layer is a porous metal sheet.

[0016] Preferably, the buffer holes are evenly distributed on the metal plate.

[0017] Preferably, the buffer hole is a regular hexagon.

[0018] This utility model also provides a range hood, including the aforementioned noise reduction device and range hood body.

[0019] The noise reduction device is located on the main body of the range hood.

[0020] Preferably, the noise reduction device is located on the back of the range hood body.

[0021] The beneficial effects of this utility model are as follows: The noise reduction device provided by this utility model forms a three-layer noise reduction structure by setting a buffer layer, a sound-absorbing layer, and a reflective layer. When noise passes through the buffer holes of the buffer layer, flow resistance is generated on the discontinuous surface to reduce low-frequency noise, thus achieving first-level noise reduction. After the first-level noise reduction by the sound-absorbing layer, the noise enters the sound-absorbing layer. The sound-absorbing filler with multiple pores in the sound-absorbing layer can absorb the noise. The noise resonates in the pores, converting sound energy into heat energy, thereby dissipating the sound energy, thus achieving second-level noise reduction. After the second-level noise reduction by the sound-absorbing layer, the noise enters the reflective layer. The noise is reflected by the transition plane formed by the protrusions and depressions in the reflective layer and enters the sound-absorbing layer again. The sound-absorbing layer absorbs the noise again, thus achieving third-level noise reduction. After the three-layer noise reduction structure, noise can be reduced in multiple layers and directions, which can improve the sound absorption efficiency.

[0022] The range hood provided by this utility model, because it includes the aforementioned noise reduction device, inevitably possesses all the advantages of that device. That is, the range hood can also reduce noise in multiple layers and directions through a three-layer noise reduction structure, thereby improving sound absorption efficiency. Attached Figure Description

[0023] The above and other objects, features, and advantages of this utility model will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this application.

[0024] Figure 1 This is a schematic diagram of the overall structure of the noise reduction device provided in an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 A magnified view of a section at point I;

[0026] Figure 3 for Figure 1 The right view in the middle;

[0027] Figure 4 This is a schematic diagram of the structure in which a noise reduction device is installed on the main body of the range hood.

[0028] In the picture:

[0029] 100. Buffer layer; 110. Buffer hole;

[0030] 200, reflective layer; 210, protrusion; 220, depression;

[0031] 300. Sound-absorbing layer; 310. Sound-absorbing filler;

[0032] 400. Range hood body. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0034] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this applies. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] The following is combined with Figures 1 to 4 The embodiments of this utility model will be described below. It should be understood that the following description is merely an illustrative embodiment of this utility model and does not constitute any limitation on this utility model.

[0037] Combination Figures 1 to 3 The present invention provides a noise reduction device comprising a buffer layer 100, a reflective layer 200, and a sound-absorbing layer 300.

[0038] The buffer layer 100 is provided with multiple buffer holes 110, which can form a discontinuous surface. When the fluid flows over the discontinuous surface, it generates flow resistance and creates a discontinuous pressure distribution on the discontinuous surface, which can buffer fluid pressure pulsation and thus reduce low-frequency noise from the flow. At the same time, the discontinuous surface diffusely reflects noise generated by other sound sources, thereby changing the concentration of noise in the local direction and reducing the noise.

[0039] The sound-absorbing layer 300 is provided with a porous sound-absorbing filler 310. The sound-absorbing layer 300 is located between the buffer layer 100 and the reflective layer 200. It can absorb noise. The noise resonates in the pores, converting sound energy into heat energy, thereby dissipating the sound energy and achieving noise reduction.

[0040] The reflective layer 200 has protrusions 210 and recesses 220, with a transition plane between the protrusions 210 and the recesses 220. Sound waves are reflected by this filtering plane, and the reflected noise sound waves can be absorbed again by the sound-absorbing layer 300 to achieve further noise reduction.

[0041] It is understood that the noise reduction device provided in the embodiments of this utility model forms a three-layer noise reduction structure by setting a buffer layer 100, a sound-absorbing layer 300, and a reflective layer 200. When noise passes through the buffer holes 110 of the buffer layer 100, flow resistance is generated on the discontinuous surface to reduce low-frequency flow noise, thus achieving primary noise reduction. After primary noise reduction by the sound-absorbing layer 300, the noise enters the sound-absorbing layer 300, where the porous sound-absorbing filler 310 can absorb the noise. Resonance occurs within the pores, converting sound energy into heat energy, thereby dissipating the sound energy and achieving secondary noise reduction. After secondary noise reduction by the sound-absorbing layer 300, the noise enters the reflective layer 200. The noise is reflected by the transition plane formed by the protrusion 210 and the depression 220 in the reflective layer 200 and re-enters the sound-absorbing layer 300, where it is absorbed again to achieve tertiary noise reduction. After the three-layer noise reduction structure, noise can be reduced in multiple layers and directions, improving sound absorption efficiency.

[0042] Specifically, in some embodiments of this invention, the sound-absorbing layer 300 can be a porous polyester fiber or melamine foam. Noise is dissipated as sound energy is converted into heat energy due to resonance within the pores. Using existing porous polyester fibers or melamine foam results in lower manufacturing costs and easier procurement of raw materials.

[0043] In addition, in some embodiments of this utility model, the incident angle between the transition plane formed by the reflective layer 200 and the sound source can be 0° to 15° or 75° to 90°, so as to maximize the sound wave reflectivity of the noise, so that the reflected noise can be absorbed a second time in the sound-absorbing layer 300 using the same principle, and further reduce noise.

[0044] Combination Figure 2 For example, the incident angle of the α sound wave can be from 0° to 15°, preferably 10° or 15°; the incident angle of the β sound wave can be from 75° to 90°, preferably 80° or 90°. It should be noted that... Figure 1 In this process, the location of the main sound source can be determined through numerical simulation.

[0045] Furthermore, in order to facilitate the manufacturing of the noise reduction device and reduce manufacturing costs, in some embodiments of this utility model, the reflective layer 200 can be a smooth metal sheet, which is formed by stamping protrusions 210 and recesses 220.

[0046] Furthermore, in order to improve the noise reflection effect, in some embodiments of this utility model, the protrusions 210 and the recesses 220 make the cross-section of the reflective layer 200 serrated.

[0047] In some embodiments of this utility model, the buffer layer 100 may also be a porous metal sheet to facilitate the manufacture of the noise reduction device.

[0048] Furthermore, in order to improve the noise reduction effect and simplify the structure of the noise reduction device, in some embodiments of this utility model, the buffer holes 110 can be evenly arranged on the metal plate.

[0049] In some embodiments of this invention, the surface of the buffer layer 100 is formed with a dense array of buffer holes 110. The shape of the buffer holes 110 can be a regular hexagon, a circle, or other shapes. Of course, the buffer holes 110 are preferably regular hexagonal, which facilitates manufacturing and simplifies the structure of the noise reduction device.

[0050] In some embodiments of this utility model, the noise reduction device can be manufactured as a sound-absorbing box. The bottom plate of the sound-absorbing box can serve as a reflective layer 200, the sound-absorbing cotton can serve as a sound-absorbing layer 300, and the cover plate of the sound-absorbing box can serve as a buffer layer 100. The sound-absorbing cotton and the cover plate of the sound-absorbing box are both installed on the bottom plate of the sound-absorbing box. Both the bottom plate and the cover plate of the sound-absorbing box are metal products, and the sound-absorbing cotton is a porous material such as polyester fiber or melamine foam.

[0051] Combination Figure 4 An embodiment of this utility model also provides a range hood, which includes the aforementioned noise reduction device and the range hood body 400.

[0052] The noise reduction device is installed on the range hood body 400 to reduce the noise of the range hood.

[0053] Of course, in some embodiments of this utility model, the noise reduction device can also be set on the back of the range hood body 400, making the range hood more aesthetically pleasing and with better noise reduction effect.

[0054] It is understood that the range hood provided in the embodiments of this utility model, since it includes the aforementioned noise reduction device, necessarily possesses all the advantages of that device. That is, the range hood can also reduce noise in multiple layers and directions through a three-layer noise reduction structure, thereby improving sound absorption efficiency.

[0055] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can 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, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the use of terms such as "preferred embodiment," "another embodiment," "some embodiments," "other embodiments," or "specific example," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A noise reduction device, characterized in that, include: The buffer layer has multiple buffer holes, forming a discontinuous surface. A reflective layer having protrusions and depressions, with a transition plane between the protrusions and the depressions; The sound-absorbing layer is provided with a porous sound-absorbing filler and is located between the buffer layer and the reflective layer.

2. The noise reduction device as described in claim 1, characterized in that, The sound-absorbing layer is made of porous polyester fiber or melamine foam.

3. The noise reduction device as described in claim 1, characterized in that, The incident angle between the transition plane and the sound source is 0° to 15° or 75° to 90°.

4. The noise reduction device as described in claim 1, characterized in that, The reflective layer is a smooth metal sheet, and the protrusions and depressions are formed by stamping.

5. The noise reduction device as described in claim 4, characterized in that, The protrusions and depressions give the cross-section of the reflective layer a serrated shape.

6. The noise reduction device as described in claim 1, characterized in that, The buffer layer is a porous metal sheet.

7. The noise reduction device as described in claim 6, characterized in that, The buffer holes are evenly distributed on the metal plate.

8. The noise reduction device as described in claim 7, characterized in that, The buffer hole is hexagonal in shape.

9. A range hood, characterized in that, Includes the noise reduction device and the range hood body as described in any one of claims 1 to 8. The noise reduction device is located on the main body of the range hood.

10. The range hood as described in claim 9, characterized in that, The noise reduction device is located on the back of the range hood body.

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