A noise reduction device and a range hood

Abstract

This utility model relates to the field of noise reduction technology, and specifically discloses a noise reduction device and a range hood. The noise reduction device includes a microporous plate for reducing high-frequency noise, a sound-absorbing cotton layer for reducing mid-frequency noise, and a Helmholtz cavity array plate for reducing low-frequency noise. The microporous plate has grooves, and the sound-absorbing cotton layer and the Helmholtz cavity array plate are sequentially stacked and embedded within the grooves. The microporous plate has multiple micropores spaced apart. The Helmholtz cavity array plate includes a plate body with multiple cavities inside. Each cavity has a through hole on the side facing the sound-absorbing cotton layer, and the through hole connects to the cavity. This noise reduction device has a simple structure, facilitating subsequent installation, maintenance, and replacement in a range hood.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology, and in particular to a noise reduction device and a range hood. Background Technology

[0002] As an essential kitchen appliance, range hoods generate noise during operation, and noise level is consistently a key performance indicator considered by consumers. Referring to the noise reduction device and range hood disclosed in Chinese Patent CN211822602U, the noise reduction device comprises several noise reduction units, each including a first noise reduction cylinder and sound-absorbing cotton. The first noise reduction cylinder has micropores on its wall, and the sound-absorbing cotton is filled inside. The range hood also includes the aforementioned noise reduction device. However, this noise reduction device has a relatively complex structure. It consists of several independent noise reduction units. When installed in a range hood, mounting holes and a base plate covering the mounting holes are provided on the side wall of the range hood casing. All noise reduction units are connected to the base plate and then installed in the mounting holes, placing the noise reduction units inside the casing to achieve noise reduction. Therefore, the connection process of the existing noise reduction device in a range hood is complex and has low installation efficiency. Utility Model Content

[0003] The present invention aims to solve the technical problems existing in the prior art, and to provide a noise reduction device with a simple structure and easy installation, as well as a range hood with the noise reduction device.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] The noise reduction device of this utility model includes a microperforated plate for reducing high-frequency noise, a sound-absorbing cotton layer for reducing mid-frequency noise, and a Helmholtz cavity array plate for reducing low-frequency noise. The microperforated plate is provided with grooves, and the sound-absorbing cotton layer and the Helmholtz cavity array plate are stacked and embedded in the grooves in sequence. The microperforated plate is provided with a plurality of microholes at intervals. The Helmholtz cavity array plate includes a plate body, and a plurality of cavities are provided inside the plate body. Each cavity has a through hole on the side facing the sound-absorbing cotton layer, and the through hole communicates with the cavity.

[0006] The noise reduction device described in this utility model comprises a groove on a microporous plate, into which a sound-absorbing cotton layer and a Helmholtz cavity array plate are sequentially stacked and embedded to form a whole. This whole constitutes the noise reduction device, which can be directly connected to the inner wall of a range hood. The structure is simpler because the sound-absorbing cotton layer and the Helmholtz cavity array plate are stacked and embedded in the groove of the microporous plate. Furthermore, the structure of the Helmholtz cavity array plate forms a combination of multiple resonant cavities. By controlling the volume of the resonant cavities or the diameter of the through holes, a wider frequency range can be covered, resulting in better noise reduction for low-frequency noise.

[0007] Furthermore, at least two connecting lugs are provided at the port of the groove of the microporous plate, and multiple assembly holes are provided at intervals on the connecting lugs.

[0008] Furthermore, there are two connecting ear plates, and the two connecting ear plates are arranged symmetrically.

[0009] Furthermore, the pore diameter of the micropores is 0.5mm-2mm.

[0010] Furthermore, the interior of the Helmholtz cavity array plate has a hollow structure, and multiple partitions are arranged horizontally and vertically at intervals inside the plate to divide the interior of the plate into multiple cavities.

[0011] Furthermore, the multiple cavities may have different volumes; or the multiple cavities may have the same volume.

[0012] Furthermore, the diameters of the through holes on all cavities are different; or the diameters of the through holes on all cavities are the same.

[0013] Furthermore, when the Helmholtz cavity array plate is embedded in the groove of the plate body, the surface of the Helmholtz cavity array plate is flush with the groove opening.

[0014] The present invention discloses a range hood comprising a main body and a chassis. A fan is installed in the main body, the axial direction of which is perpendicular to the length direction of the chassis. The aforementioned noise reduction device is installed on the axial direction of the fan and on two opposite inner walls of the main body.

[0015] The range hood described in this utility model has the aforementioned noise reduction devices installed along the axial direction of the fan and on two opposite inner walls of the main housing. These devices effectively reduce noise from the side of the main housing directly facing the user during operation, resulting in a better user experience. Furthermore, since the noise reduction devices are integrated into a single unit via a microperforated plate, sound-absorbing cotton layer, and Helmholtz cavity array plate, they can be directly connected to the inner wall of the main housing without the need for other auxiliary components, thus simplifying the installation process.

[0016] Furthermore, when the noise reduction device is connected to the inner wall of the main housing, the side of the Helmholtz cavity array plate in the noise reduction device that faces away from the sound-absorbing cotton layer abuts against the inner wall of the main housing, and the microporous plate faces the fan. Attached Figure Description

[0017] The above and other objects, features, and advantages of this invention 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 invention.

[0018] Figure 1 This is a schematic diagram of the noise reduction device in this utility model.

[0019] Figure 2 This is an exploded view of the noise reduction device.

[0020] Figure 3 This is a schematic diagram showing the connection status of the noise reduction device inside the range hood.

[0021] Figure 4 This is a screenshot of a Helmholtz cavity array plate.

[0022] Figure 5 for Figure 2 Enlarged view of part A in the middle.

[0023] Among them, there are: micro-perforated plate 1; sound-absorbing cotton layer 2; Helmholtz cavity array plate 3; fan 4; micro-hole 5; cavity 6; through hole 7; connecting ear plate 8; assembly hole 9; main box 10; partition plate 11; chassis 12; and noise reduction device 13. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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. 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.

[0027] See Figure 1 , 2 5. Specifically, this utility model provides an embodiment of a noise reduction device, including a microperforated plate 1 for reducing high-frequency noise, a sound-absorbing cotton layer 2 for reducing mid-frequency noise, and a Helmholtz cavity array plate 3 for reducing low-frequency noise. It should be noted that the principles by which the microperforated plate 1 can achieve high-frequency noise reduction, the sound-absorbing cotton can achieve mid-frequency noise reduction, and the Helmholtz cavity can achieve low-frequency noise reduction are existing technologies and are not the inventive point of this utility model. This utility model only focuses on the connection structure of the three components. The microperforated plate 1 is provided with grooves, and the sound-absorbing cotton layer 2 and the Helmholtz cavity array plate 3 are stacked and embedded in the grooves in sequence. The microperforated plate 1 is provided with a plurality of microholes 5 at intervals. The Helmholtz cavity array plate 3 includes a plate body, and a plurality of cavities 6 are provided inside the plate body. Each cavity 6 is provided with a through hole 7 on the side facing the sound-absorbing cotton layer 2, and the through hole 7 connects to the cavity 6. The noise reduction device 13 can be directly connected to the inner wall of the range hood housing. It is embedded in the groove of the microporous plate 1 after being stacked with the sound-absorbing cotton layer 2 and the Helmholtz cavity array plate 3, resulting in a simpler structure. In addition, the structure of the Helmholtz cavity array plate 3 forms a combination of multiple resonant cavities, which can cover a wider frequency range and has a better noise reduction effect on low-frequency noise.

[0028] In the prior art, such as the noise reduction device and range hood disclosed in Chinese Patent CN211822602U, the noise reduction device is composed of several noise reduction units, which are independent individuals. When it needs to be installed in the range hood, the side wall of the range hood shell has a mounting hole and a base plate covering the mounting hole. All the noise reduction units are connected to the base plate and then installed in the mounting hole, so that the noise reduction units are located inside the shell, thereby realizing the noise reduction function. It can be seen that the connection process of the noise reduction device in the range hood in the prior art is relatively complex and the installation efficiency is low. In contrast, the noise reduction device 13 in this application directly embeds the sound-absorbing cotton layer 2 and the Helmholtz cavity array plate 3 into the groove of the microporous plate, directly making the noise reduction device a whole. It can also be understood as making the noise reduction device modular, with a simple structure, which makes it easy to directly connect the modular noise reduction device to the main body 10 of the range hood, simplifying the assembly process, improving the installation efficiency, and also facilitating the maintenance and replacement of the noise reduction device in the future.

[0029] In the preferred embodiment, see Figure 1 and Figure 2At least two connecting lugs 8 are provided at the port of the groove of the microporous plate 1, and multiple mounting holes 9 are provided at intervals on the connecting lugs 8. Specifically, in this embodiment, there are two connecting lugs 8, and the two connecting lugs 8 are symmetrically arranged. The noise reduction device is connected to the inner wall of the main housing 10 by contacting the connecting lugs 8 and by fasteners passing through the mounting holes 9. Since the two connecting lugs 8 are symmetrically arranged, the noise reduction device can be more firmly connected in the main housing 10. In this embodiment, there are three mounting holes 9 on the connecting lugs 8, and the three mounting holes 9 are spaced apart along the length of the connecting lugs 8, and the mounting holes 9 on the two connecting lugs 8 are symmetrical.

[0030] In a preferred embodiment, the pore size of the micropore 5 is 0.5mm-2mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, with 0.8mm-1.3mm being the preferred size. Setting the pore size of the micropore 5 to 0.8mm-1.3mm can more effectively reduce high-frequency noise, resulting in better performance. When the pore size is greater than 1.3mm, energy dissipation is insufficient and structural strength decreases. When the pore size is less than 0.8mm, the micropore 5 is prone to clogging and has high processing costs. Therefore, when the pore size of the micropore 5 is 0.8mm-1.3mm, an optimal balance can be achieved between noise reduction effect, durability, and cost.

[0031] In the preferred embodiment, see Figure 4The Helmholtz cavity array plate 3 has a hollow internal structure, with multiple partitions 11 arranged horizontally and vertically at intervals inside the plate to divide the interior into multiple cavities 6. Specifically, the volumes of the multiple cavities 6 can be the same or different. When the volumes of the multiple cavities 6 are different, it can be understood that a portion of the cavities 6 has a volume of V1, and the remaining portion has a volume of V2, where V1 and V2 are not equal. Alternatively, it can be understood that a portion of the cavities 6 has a volume of V1, another portion has a volume of V2, and the remaining portion has a volume of V3. It can also be understood that the volume of each cavity 6 is different. The specific embodiments of the multiple cavities 6 with different volumes in this utility model are not limited to the above three embodiments. Any methods equivalent to the above three embodiments belong to the specific embodiments of the multiple cavities 6 with different volumes mentioned in this application. Furthermore, the diameters of the through holes 7 on all cavities 6 can be the same or different. When the diameters of the through holes 7 on multiple cavities 6 are different, it can be understood that the diameter of the through holes 7 on some cavities 6 is D1, and the diameter of the through holes 7 on the remaining cavities 6 is D2, where D1 and D2 are not equal. It can also be understood that the diameter of the through holes 7 on some cavities 6 is D1, the diameter of the through holes 7 on some cavities 6 is D2, and the diameter of the through holes 7 on the remaining cavities 6 is D3. It can also be understood that the diameter of the through holes 7 on each cavity 6 is different. The specific embodiments of the different diameters of the through holes 7 on multiple cavities 6 in this utility model are not limited to the above three. Those methods that are equivalent to the above three embodiments belong to the specific embodiments of the different diameters of the through holes 7 on multiple cavities 6 mentioned in this application. By selecting the volume of cavity 6 and / or the aperture of the through hole 7 on cavity 6, better noise reduction effect can be achieved in low frequency noise reduction. Wide frequency coverage and higher absorption efficiency are achieved by combining multiple cavities 6.

[0032] In a preferred embodiment, when the Helmholtz cavity array plate 3 is embedded in the groove of the plate body, the surface of the Helmholtz cavity array plate 3 is flush with the groove opening. With the above structure, when the noise reduction device is connected to the inner wall of the main housing 10, the connecting ear plate 8 can be tightly attached to the inner wall of the main housing 10 to avoid gaps, resulting in a good fit and improving the noise reduction effect.

[0033] This utility model also provides a specific implementation method for a range hood, see [link to relevant documentation]. Figure 3The range hood includes a main housing 10 and a chassis 12. A fan 4 is installed inside the main housing 10, with its axis perpendicular to the length of the chassis 12. Noise reduction devices 13 are respectively installed on two opposite inner walls of the main housing 10 along the axial direction of the fan 4. In this embodiment, the noise reduction devices 13 installed on the two opposite inner walls of the main housing 10 along the axial direction of the fan 4 effectively reduce noise from the side of the main housing directly facing the user when the range hood is operating, resulting in a better user experience. Furthermore, since the noise reduction devices are directly integrated through the microperforated plate 1, the sound-absorbing cotton layer 2, and the Helmholtz cavity array plate 3, they can be directly connected to the inner wall of the main housing 10 without the need for other auxiliary components, thus simplifying the installation process.

[0034] In a preferred embodiment, when the noise reduction device is connected to the inner wall of the main housing 10, the side of the Helmholtz cavity array plate 3 in the noise reduction device facing away from the sound-absorbing cotton layer 2 abuts against the inner wall of the main housing 10, and the micro-perforated plate 1 faces the fan 4. This facilitates the connection of the noise reduction device to the inner wall of the main housing 10 and also helps to gradually reduce high-frequency, mid-frequency, and low-frequency noise.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" 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.

[0036] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example 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.

[0037] 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: The device includes a microporous plate for reducing high-frequency noise, a sound-absorbing cotton layer for reducing mid-frequency noise, and a Helmholtz cavity array plate for reducing low-frequency noise. The microporous plate has grooves, and the sound-absorbing cotton layer and the Helmholtz cavity array plate are stacked and embedded in the grooves. The microporous plate has multiple micropores spaced apart. The Helmholtz cavity array plate includes a plate body, and multiple cavities are provided inside the plate body. Each cavity has a through hole on the side facing the sound-absorbing cotton layer, and the through hole connects to the cavity.

2. The noise reduction device according to claim 1, characterized in that: At least two connecting lugs are provided at the port of the groove of the microporous plate, and multiple assembly holes are provided at intervals on the connecting lugs.

3. The noise reduction device according to claim 2, characterized in that: There are two connecting lugs, and the two connecting lugs are arranged symmetrically.

4. The noise reduction device according to claim 1, characterized in that: The pore diameter of the micropore is 0.5mm-2mm.

5. The noise reduction device according to claim 1, characterized in that: The interior of the Helmholtz cavity array plate has a hollow structure, and multiple partitions are arranged horizontally and vertically at intervals inside the plate to divide the interior of the plate into multiple cavities.

6. The noise reduction device according to claim 1 or 5, characterized in that: The multiple cavities have different volumes; or the multiple cavities have the same volume.

7. The noise reduction device according to claim 1 or 5, characterized in that: The diameters of the through holes on all cavities are different; or the diameters of the through holes on all cavities are the same.

8. The noise reduction device according to claim 1, characterized in that: When the Helmholtz cavity array plate is embedded in the groove of the plate body, the surface of the Helmholtz cavity array plate is flush with the groove opening.

9. A range hood, comprising a main housing and a chassis, wherein a fan is disposed within the main housing, the axial direction of the fan being perpendicular to the length direction of the chassis, characterized in that: A noise reduction device as described in any one of claims 1-8 is provided on the two opposite inner walls of the main housing in the axial direction of the fan.

10. The range hood according to claim 9, characterized in that: When the noise reduction device is connected to the inner wall of the main housing, the side of the Helmholtz cavity array plate in the noise reduction device that faces away from the sound-absorbing cotton layer abuts against the inner wall of the main housing, and the micro-perforated plate faces the fan.

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