Noise reduction structure of range hood and range hood

Abstract

The utility model belongs to the technical field of range hoods, and particularly discloses a noise reduction structure of a range hood and the range hood. According to the noise reduction structure of the range hood provided by the utility model, the noise reduction module and the sound absorption module are arranged in the mainframe box, so that the noise in the mainframe box is reduced; the noise reduction module comprises a reflection panel, a penetrating hole is formed in the reflection panel, noise penetrating through the penetrating hole and entering the noise reduction module is absorbed by the noise reduction module, low and medium frequency sound waves are absorbed through the principle of a micro-perforated resonant cavity, and noise sound waves which are not absorbed by the noise reduction module can be reflected to the sound absorption module by the reflection panel. The sound absorption module absorbs reflected noise sound waves, and the noise reduction structure not only realizes multi-stage noise reduction, but also reduces full-band noise in the running process of the range hood; in addition, the arc-shaped reflection panel structure also greatly reduces the wind resistance in the flow channel, reduces the probability of vortex formation in a flow dead zone, and achieves the effects of resistance reduction and noise reduction.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a noise reduction structure of a range hood and the range hood. Background Art

[0002] Range hoods are an essential appliance in today's kitchens. While their fume extraction performance is improving, their noise levels are also increasing. This is particularly true within the main hood chassis, which not only impacts the user's cooking experience but can even harm their physical and mental health. Looking at the operating noise spectrum, at all operating levels, mid- and low-frequency noise within 1000Hz accounts for the largest proportion. These mid- and low-frequency noises are typically passively reduced using sound-absorbing cotton, but these absorb poorly, resulting in poor noise reduction for range hoods. Utility Model Content

[0003] The purpose of the utility model is to provide a noise reduction structure of a range hood and a range hood, which realizes multi-level noise reduction and has a good absorption effect on medium and low frequency sound waves, thereby reducing noise in the entire frequency band during the operation of the range hood.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] In a first aspect, a noise reduction structure for a range hood is provided, comprising:

[0006] Host chassis;

[0007] A noise reduction module is disposed in the main chassis, and includes a curved reflective panel having a plurality of through holes provided on the reflective panel. The through holes are used for allowing noise waves to pass through, and the noise waves are absorbed by the noise reduction module.

[0008] The sound absorbing module is arranged in the main chassis and is arranged opposite to the reflective panel. The sound absorbing module is used to absorb the noise sound waves reflected by the reflective panel.

[0009] As an optional technical solution for the noise reduction structure of the above-mentioned range hood, the noise reduction module also includes a noise reduction shell, one end of the noise reduction shell is open and connected to the side wall of the main case, and a reflective panel is provided at the other end of the noise reduction shell, and the reflective panel and the noise reduction shell are arranged to form a sound-absorbing cavity.

[0010] As an optional technical solution for the noise reduction structure of the above-mentioned range hood, the aperture of each through hole is greater than 2 mm and less than or equal to 4 mm, and a sound-absorbing block is provided in the sound-absorbing cavity, which is configured to absorb noise sound waves incident from the reflective panel.

[0011] As an optional technical solution for the noise reduction structure of the above-mentioned range hood, the sound-absorbing block is made of flexible material, and the noise reduction shell is provided with a circumferential edge at one end of the opening bent inwardly and provided with a limit baffle, which stops the sound-absorbing block in the sound-absorbing cavity.

[0012] As an optional technical solution for the noise reduction structure of the range hood described above, the diameter of each through hole is less than 1 mm.

[0013] As an optional technical solution for the noise reduction structure of the above-mentioned range hood, the noise reduction shell is provided with a circumferential edge of one end of the opening bent inwardly to provide a connecting plate, and the connecting plate is sealed to the side wall of the main box.

[0014] As an optional technical solution for the noise reduction structure of the range hood described above, the reflective panel is in a regular arc shape; or

[0015] The reflective panel has an irregular arc shape.

[0016] As an optional technical solution for the noise reduction structure of the above-mentioned range hood, the main chassis includes a front panel and a rear panel that are relatively arranged, the noise reduction module is connected to the front panel, and the sound absorption module is connected to the rear panel.

[0017] As an optional technical solution for the noise reduction structure of the range hood described above, noise reduction modules are provided at both ends of the centrifugal fan in the main chassis, and each noise reduction module is provided with a corresponding sound absorption module.

[0018] In a second aspect, a range hood is provided, comprising a centrifugal fan and the noise reduction structure of any of the above range hoods, wherein the centrifugal fan is arranged in a main chassis.

[0019] Beneficial effects of the utility model:

[0020] The noise reduction structure of the range hood provided by the utility model is provided with a noise reduction module and a sound absorption module in the main box to reduce the noise in the main box; the noise reduction module includes a reflection panel, and the reflection panel is provided with a through hole. The noise that passes through the through hole and enters the noise reduction module is absorbed by the noise reduction module, which utilizes the principle of micro-perforated resonance cavity to absorb medium and low frequency sound waves, and the noise sound waves not absorbed by the noise reduction module will be reflected by the reflection panel to the sound absorption module, and the sound absorption module absorbs the reflected noise sound waves. This noise reduction structure not only realizes multi-stage noise reduction, but also reduces the noise of the entire frequency band during the operation of the range hood; in addition, the arc-shaped reflection panel structure also greatly reduces the wind resistance in the flow channel, reduces the probability of vortex formation in the flow dead zone, and achieves the effect of reducing resistance and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of the main box of the range hood provided by an embodiment of the utility model;

[0022] Figure 2 This is a side sectional view of the internal structure of the main case of the range hood provided by an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the first structure of the noise reduction module provided by an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the second structure of the noise reduction module provided by an embodiment of the present utility model;

[0025] Figure 5 It is a curve diagram of the sound absorption coefficient of the reflective panel provided in the embodiment of the present utility model.

[0026] In the picture:

[0027] 100. Centrifugal fan;

[0028] 1. Main chassis; 2. Noise reduction module; 3. Sound absorption module;

[0029] 11. Front panel; 12. Rear panel;

[0030] 21. Reflective panel; 22. Through hole; 23. Noise reduction shell; 24. Sound-absorbing cavity; 25. Sound-absorbing block; 26. Limit baffle; 27. Connecting plate. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] Example 1

[0036] like Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a noise reduction structure for a range hood, comprising a main chassis 1, a noise reduction module 2, and a sound absorption module 3. Both the noise reduction module 2 and the sound absorption module 3 are disposed within the main chassis 1. The noise reduction module 2 includes a curved reflective panel 21 having a plurality of holes 22 therein. The holes 22 are configured to allow noise waves to pass through, and the noise waves are absorbed by the noise reduction module 2. The sound absorption module 3 is disposed within the main chassis 1 and directly opposite the reflective panel 21. The sound absorption module 3 is configured to absorb noise waves reflected by the reflective panel 21.

[0037] The noise reduction structure of the range hood provided in this embodiment is provided with a noise reduction module 2 and a sound absorption module 3 in the main case 1 to reduce the noise in the main case 1; the noise reduction module 2 includes a reflective panel 21, and a perforation 22 is provided on the reflective panel 21. The noise entering the noise reduction module 2 through the perforation 22 is absorbed by the noise reduction module 2, which utilizes the principle of micro-perforated resonance cavity to absorb medium and low frequency sound waves, and the noise sound waves not absorbed by the noise reduction module 2 will be reflected by the reflective panel 21 to the sound absorption module 3, and the sound absorption module 3 absorbs the reflected noise sound waves. This noise reduction structure not only realizes multi-stage noise reduction, but also reduces the noise of the entire frequency band during the operation of the range hood; in addition, the arc-shaped reflective panel 21 structure also greatly reduces the wind resistance in the flow channel, reduces the probability of vortex formation in the flow dead zone, and achieves the effect of reducing drag and noise.

[0038] The main chassis 1 includes a front panel 11 and a rear panel 12 that are positioned opposite each other. A noise reduction module 2 is connected to the front panel 11 to prevent noise from radiating through the front panel 11, effectively reducing noise and affecting the user's cooking experience. A sound absorption module 3 is connected to the rear panel 12 and is positioned opposite the noise reduction module 2.

[0039] A centrifugal fan 100 is provided in the main chassis 1 , and noise reduction modules 2 are provided at both ends of the centrifugal fan 100 . Each noise reduction module 2 is provided with a corresponding sound absorption module 3 to further reduce noise.

[0040] The sound absorbing module 3 may be a suction cotton or a perlite suction board, which is not specifically limited here.

[0041] In some embodiments, continue to refer to Figure 1 and Figure 3 As shown, the noise reduction module 2 also includes a noise reduction housing 23, one end of which is open and connected to the side wall of the main chassis 1. A reflective panel 21 is provided at the other end of the noise reduction housing 23. The reflective panel 21 and the noise reduction housing 23 enclose a sound-absorbing cavity 24. The arrangement of the perforated holes 22 and the sound-absorbing cavity 24 can realize the principle of a micro-perforated resonance cavity to achieve the purpose of absorbing medium and low frequency sound waves. Optionally, the noise reduction housing 23 and the reflective panel 21 are an integrally formed structure, and the end of the noise reduction housing 23 connected to the reflective panel 21 is an arc-shaped structure that adapts to the reflective panel 21.

[0042] Optionally, the diameter of each perforation 22 is greater than 2 mm and less than or equal to 4 mm. A sound-absorbing block 25 is disposed within the sound-absorbing cavity 24. The sound-absorbing block 25 is configured to absorb noise waves incident on the reflective panel 21. Noise waves entering the sound-absorbing cavity 24 through the perforation 22 are absorbed by the sound-absorbing block 25, resulting in a good noise reduction effect. Furthermore, optionally, the sound-absorbing block 25 completely fills the sound-absorbing cavity 24 to further enhance the noise reduction effect.

[0043] The sound-absorbing block 25 is made of a flexible material. Preferably, the sound-absorbing block 25 is a foam-type sound-absorbing block with high plasticity and good sound absorption effect. The noise reduction shell 23 is provided with a circumferential edge at one end of the opening, which is bent inward and provided with a limit baffle 26. The limit baffle 26 stops the sound-absorbing block 25 in the sound-absorbing cavity 24. The sound-absorbing block 25 fills the sound-absorbing cavity 24. The limit baffle 26 cooperates with the reflective panel 21 to fix the sound-absorbing block 25. Since the sound-absorbing block 25 has a certain plasticity, the sound-absorbing block 25 fits the reflective panel 21, which improves the noise reduction effect. The sound-absorbing block 25 is deformed and placed in the sound-absorbing cavity 24, which facilitates the installation of the sound-absorbing block 25. Since the sound-absorbing cavity 24 is filled with the sound-absorbing block 25, the sealing requirements for the connection between the noise-absorbing shell 23 and the side wall of the main chassis 1 are not high. The noise-absorbing shell 23 and the side wall of the main chassis 1 can be snap-fitted, and no specific restrictions are made here.

[0044] In some embodiments, the reflective panel 21 has a regular arc shape. Alternatively, the reflective panel 21 has an irregular arc shape. For example, the reflective panel 21 has multiple continuous arcs. The irregular arc shape has a better diversion effect, and the noise sound waves reflected by the reflective panel 21 are not focused on one point. Specifically, the structure of the reflective panel 21 can be set according to the actual noise reduction requirements. Figure 2 As shown, the arc-shaped reflective panel 21 does not block the air inlet of the centrifugal fan 100, thereby improving the compactness of the internal structure of the range hood.

[0045] This embodiment further provides a range hood, comprising a centrifugal fan 100 and the above-mentioned noise reduction structure of the range hood, wherein the centrifugal fan 100 is disposed in the main chassis 1. Other structures of the range hood are prior art and are not specifically limited here.

[0046] Example 2

[0047] like Figure 1 、 Figure 2 and Figure 4 As shown, the present embodiment provides a noise reduction structure for a range hood. Different from the first embodiment, the aperture of each through hole 22 on the reflective panel 21 in the present embodiment is less than 1 mm. Based on the setting of the aperture of the through hole 22, there is no need to set a sound absorbing block 25 in the sound absorbing cavity 24. The noise sound waves are absorbed by the through holes 22, and the frequency band of the absorbed noise sound waves is lower, which can effectively cover the noise sound waves below the lowest reflection frequency of the reflective panel 21. The noise sound waves reflected by the reflective panel 21 are reflected onto the sound absorbing module 3.

[0048] Because the sound-absorbing block 25 is not provided within the sound-absorbing cavity 24, to ensure effective noise reduction, the noise-reduction housing 23 is provided with a connecting plate 27, which is bent inwardly along the circumferential edge of one open end. The connecting plate 27 is sealed to the side wall of the main chassis 1. For example, the connecting plate 27 is bolted to the side wall of the main chassis 1, and a seal is further provided between the connecting plate 27 and the side wall of the main chassis 1. Alternatively, the connecting plate 27 is bonded or welded to the side wall of the main chassis 1.

[0049] This embodiment further provides a range hood, comprising a centrifugal fan 100 and the above-mentioned noise reduction structure of the range hood, wherein the centrifugal fan 100 is disposed in the main chassis 1. Other structures of the range hood are prior art and are not specifically limited here.

[0050] like Figure 2 and Figure 3As shown, in the above-mentioned embodiments 1 and 2, for the reflective panel 21 with a regular arc shape, the distance between the front panel 11 and the rear panel 12 of the main chassis 1 is set to D1, and the thickness of the sound absorbing block 25 is set to h. Then, the diameter R1 of the reflective panel 21 is 4(D1-h). According to the concave reflection principle, the reflective panel 21 can only reflect noise sound waves with a wavelength smaller than its diameter. Since R1=4(D1-h), it can be seen that the lowest reflection frequency f of the reflective panel 21 is min =C0 / R1=C0 / 4(D1-h).

[0051] The maximum sound absorption coefficient α of the reflection panel 21 max The corresponding frequency is f n , Wherein, t is the thickness of the reflective panel 21, p is the perforation rate of the reflective panel 21, D is the depth of the sound absorbing cavity 24, R3 is the aperture of the perforated hole 22, and C0 is the speed of sound. n <f min , greater than the lowest reflection frequency f min The sound waves with a frequency of will be reflected by the reflective panel 21, while the sound waves with a frequency lower than the lowest reflection frequency f min The sound waves of the frequency will be incident on the reflection panel 21.

[0052] In order to ensure a good noise reduction effect, the maximum sound absorption coefficient α of the reflective panel 21 max Should be at least greater than 0.8, where Wherein kr is the acoustic resistance coefficient, and the values ​​of t, p, and R3 are the same as the values ​​of p, t, and R3 in the above calculation formula of the reflection frequency f.

[0053] According to the above formula, when the aperture R3 of the perforated hole 22 is 0.5 mm, the thickness t of the reflective panel 21 is 2 mm, the perforation rate p of the reflective panel 21 is 1%, the depth D of the sound absorbing cavity 24 is 40 mm, and the acoustic resistance coefficient kr is 1.36, the maximum sound absorption coefficient α is max is 0.94, see Figure 5 As shown in FIG, the reflection frequency f of the reflection panel 21 corresponding to the maximum sound absorption coefficient is 552 Hz. Figure 5 As shown, when α is greater than 0.5, the reflection frequency f ranges from 320 Hz to 750 Hz.

[0054] It should be further explained that the reflective panel 21 can only reflect sound waves with a wavelength smaller than its diameter. Taking the diameter of the reflective panel 21 as an example, which is 750 mm, the frequency limit of the sound waves reflected by the reflective panel 21 can reach 457 Hz. Sound waves below 457 Hz are absorbed by the noise reduction module 2. Since the perforation rate of the reflective panel 21 generally does not exceed 5%, for example, to effectively absorb sound waves below 500 Hz, the perforation rate must basically reach about 1%. Therefore, the actual effective area of ​​the perforations 22 is relatively small. The portion of the reflective panel 21 without the perforations 22 acts as a reflector, thereby achieving an integrated multi-dimensional noise reduction effect.

[0055] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The noise reduction structure of the range hood is characterized by: include: Main chassis (1); A noise reduction module (2) is arranged in the main chassis (1), the noise reduction module (2) comprises an arc-shaped reflection panel (21), the reflection panel (21) is provided with a plurality of penetration holes (22), the penetration holes (22) are used for allowing noise sound waves to pass through, and the noise sound waves are absorbed by the noise reduction module (2); A sound absorption module (3) is arranged in the main chassis (1) and is arranged opposite to the reflection panel (21). The sound absorption module (3) is used to absorb noise sound waves reflected by the reflection panel (21).

2. The noise reduction structure of the range hood according to claim 1, characterized in that: The noise reduction module (2) further comprises a noise reduction shell (23), one end of the noise reduction shell (23) is open and connected to the side wall of the main chassis (1), the other end of the noise reduction shell (23) is provided with the reflection panel (21), and the reflection panel (21) and the noise reduction shell (23) are surrounded to form a sound absorbing cavity (24).

3. The noise reduction structure of the range hood according to claim 2, characterized in that: The aperture of each of the perforated holes (22) is greater than 2 mm and less than or equal to 4 mm. A sound absorbing block (25) is provided in the sound absorbing cavity (24). The sound absorbing block (25) is configured to absorb noise sound waves incident from the reflective panel (21).

4. The noise reduction structure of the range hood according to claim 3, characterized in that: The sound absorbing block (25) is made of a flexible material. The noise reduction shell (23) is provided with a circumferential edge of one end of the opening bent inwardly and provided with a limiting baffle (26). The limiting baffle (26) stops the sound absorbing block (25) in the sound absorbing cavity (24).

5. The noise reduction structure of the range hood according to claim 2, characterized in that: The diameter of each of the perforated holes (22) is less than 1 mm.

6. The noise reduction structure of the range hood according to claim 5, characterized in that: The noise reduction shell (23) is provided with a connecting plate (27) whose circumferential edge at one end of the opening is bent inwardly, and the connecting plate (27) is sealed and connected to the side wall of the main box (1).

7. The noise reduction structure of a range hood according to any one of claims 1 to 6, characterized in that: The reflective panel (21) is in a regular arc shape; or The reflective panel (21) is in an irregular arc shape.

8. The noise reduction structure of a range hood according to any one of claims 1 to 6, characterized in that: The main chassis (1) comprises a front panel (11) and a rear panel (12) arranged opposite to each other, the noise reduction module (2) is connected to the front panel (11), and the sound absorption module (3) is connected to the rear panel (12).

9. The noise reduction structure of the range hood according to claim 8, characterized in that: The noise reduction modules (2) are provided at both ends of the centrifugal fan (100) in the main housing (1), and each noise reduction module (2) is correspondingly provided with the sound absorption module (3).

10. A range hood, characterized in that: The noise reduction structure of the range hood comprises a centrifugal fan (100) and any one of claims 1 to 9, wherein the centrifugal fan (100) is arranged in the main housing (1).

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