Noise reduction device of range hood and range hood

Abstract

The utility model belongs to the technical field of range hoods, and particularly discloses a noise reduction device of a range hood and the range hood. According to the noise reduction device of the range hood and the range hood provided by the utility model, the distribution and arrangement structures of the first boss and the plurality of diffusion grooves enable noise sound waves to be diffused, and the noise sound waves are reflected to different directions, so that directional reflection of the noise sound waves is broken through; the sound wave energy of the noise sound wave is greatly consumed in the range hood shell of the range hood, so that the effect of effectively reducing the noise sound wave energy is realized, and the sound conducted beside the ears of a user is further reduced; the noise reduction device does not occupy the space in the range hood shell, does not influence the exhaust air rate of the range hood, is modularized in design, convenient to disassemble and assemble and suitable for noise elimination of all frequency bands, has the characteristics of broadband sound absorption, low airflow impedance and modularized maintenance, and improves the use experience of a user.

Description

Technical Field

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

[0002] As the core smoke exhaust equipment in the kitchen, the noise control of the range hood has become a key indicator affecting the user experience. The noise reduction methods commonly used in the industry at present mainly include: (1) adding rubber shock-absorbing pads to the motor base to reduce low-frequency vibration noise by blocking structural sound transmission, but it cannot suppress the mid-to-high frequency air noise caused by airflow turbulence; (2) attaching porous sound-absorbing cotton (such as polyurethane foam material) to the inner wall of the air duct to absorb sound energy of specific frequency bands by using pore resonance. However, the sound absorption coefficient of a single sound-absorbing structure is less than 0.3 in the low-frequency band below 200Hz, and the dense material will increase the air duct resistance, resulting in a 15%-20% decrease in exhaust volume; (3) adopting the Helmholtz resonant cavity design to achieve narrowband noise reduction by adjusting the cavity volume and neck size, but the effective bandwidth is usually less than 1 / 3 octave, which is difficult to cover the wideband noise of the range hood.

[0003] In summary, the shortcomings of existing technologies are as follows: the thickness of traditional sound-absorbing materials is spatially incompatible with the compact structure of range hoods; the frequency response characteristics of passive noise reduction devices have low matching degree with the noise spectrum, resulting in insufficient overall noise reduction; although composite soundproof enclosure solutions can improve the noise reduction effect, they suffer from airflow loss due to aerodynamic design defects. Utility Model Content

[0004] The purpose of this utility model is to provide a noise reduction device and range hood for a range hood, which has the characteristics of wide-band sound absorption, low airflow impedance and modular maintenance, thereby improving the user experience.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a noise reduction device for a range hood is provided, including a noise reduction plate. A first boss and a plurality of diffusion grooves are provided on a first side of the noise reduction plate. The first boss and the plurality of diffusion grooves are arranged sequentially and adjacent to each other along a first direction. The grooves of the plurality of diffusion grooves have different depths, and the end face of the side wall of each diffusion groove is flush with the surface of the first boss.

[0007] As an optional technical solution for the noise reduction device of the aforementioned range hood, there are six diffusion channels, which are respectively defined as the first diffusion channel, the second diffusion channel, the third diffusion channel, the fourth diffusion channel, the fifth diffusion channel and the sixth diffusion channel. The height of the first boss is d0, the depth of the first diffusion channel is d1, the depth of the second diffusion channel is d2, the depth of the third diffusion channel is d3, the depth of the fourth diffusion channel is d4, the depth of the fifth diffusion channel is d5, and the depth of the sixth diffusion channel is d6. The ratio of d0:d1:d2:d3:d4:d5:d6 is 0:1:4:2:2:4:1.

[0008] As an optional technical solution for the noise reduction device of the aforementioned range hood, the depth of the first diffusion groove Where c is the speed of sound, f r The target frequency controlled by the noise reduction device.

[0009] As an optional technical solution for the noise reduction device of the aforementioned range hood, the second side of the noise reduction plate is recessed towards the first side, and a second, third, and fourth protrusions of equal height are formed on the first side of the noise reduction plate. A second diffusion groove is formed between the second and third protrusions, and a fifth diffusion groove is formed between the third and fourth protrusions. A first diffusion groove is formed by recessing the second protrusion, and a first protrusion is formed at the same time. A third and fourth diffusion grooves are formed by recessing the third protrusion, and a sixth diffusion groove is formed by recessing the fourth protrusion.

[0010] As an optional technical solution for the noise reduction device of the aforementioned range hood, noise reduction holes are provided on the surface of the first boss, the bottom of the first diffusion groove, the bottom of the third diffusion groove, the bottom of the fourth diffusion groove, and the bottom of the sixth diffusion groove.

[0011] As an optional technical solution for the noise reduction device of the aforementioned range hood, the diameter of the noise reduction hole is 1.5mm-3mm, and the distance between two adjacent noise reduction holes is 8mm-15mm.

[0012] As an optional technical solution for the noise reduction device of the aforementioned range hood, a first groove, a second groove, and a third groove are formed on the second side of the noise reduction plate, and sound-absorbing elements are respectively filled in the first groove, the second groove, and the third groove.

[0013] As an optional technical solution for the noise reduction device of the aforementioned range hood, multiple diffusion grooves have the same width, and the width of the diffusion grooves is greater than or equal to 25mm.

[0014] As an optional technical solution for the noise reduction device of the above-mentioned range hood, the first direction is the length direction of the noise reduction plate, the width direction of the noise reduction plate is the second direction, the first boss and multiple diffusion grooves are arranged sequentially and adjacently along the length direction of the noise reduction plate, and the first boss and multiple diffusion grooves extend along the width direction of the noise reduction plate.

[0015] Alternatively, the first direction is the width direction of the noise reduction plate, the length direction of the noise reduction plate is the second direction, the first boss and multiple diffusion grooves are arranged sequentially and adjacently along the width direction of the noise reduction plate, and the first boss and multiple diffusion grooves extend along the length direction of the noise reduction plate.

[0016] Secondly, a range hood is provided, including a range hood housing, a fan assembly and the aforementioned noise reduction device for the range hood are provided inside the range hood housing, and a noise reduction plate is provided on the inner side wall of the range hood housing, with the first side of the noise reduction plate facing the fan assembly.

[0017] As an optional technical solution for the aforementioned range hood, a noise reduction plate is provided on at least one side wall of the range hood housing opposite to the air inlet of the fan assembly, and the first side of the noise reduction plate faces the air inlet of the fan assembly.

[0018] The beneficial effects of this utility model are:

[0019] The noise reduction device and range hood provided by this utility model have a first boss and multiple diffusion grooves on the first side of the noise reduction plate. The grooves have different depths, and the end face of the side wall of each diffusion groove is flush with the surface of the first boss. The distribution and arrangement of the first boss and multiple diffusion grooves cause noise waves to diffuse and be reflected in different directions, breaking the directional reflection of noise waves. Due to the multiple reflections and refractions of the noise waves, the sound wave energy is greatly consumed within the range hood casing, effectively reducing the noise wave energy and thus reducing the sound transmitted to the user's ears. This noise reduction device does not occupy the space inside the range hood casing, does not affect the exhaust volume of the range hood, has a modular design, is easy to disassemble and assemble, and is suitable for noise reduction in various frequency bands. The noise reduction device provided by this utility model has the characteristics of wide-band sound absorption, low airflow impedance, and modular maintenance, improving the user experience. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of the range hood provided in this embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram illustrating the principle of sound wave reflection and diffusion provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the first noise reduction device provided in this embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the diffusion groove and the first boss provided in an embodiment of the present invention;

[0024] Figure 5 This is an exploded view of a partial structure of the range hood provided in this embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the second noise reduction device provided in this embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the third noise reduction device provided in this embodiment of the utility model;

[0027] Figure 8 This is a structural schematic diagram of a noise reduction device with sound-absorbing components provided in an embodiment of this utility model.

[0028] In the picture:

[0029] 100. Range hood housing; 200. Fan assembly; 300. Smoke collection chamber;

[0030] 1. Noise-reducing board; 2. First boss; 3. Diffuser groove; 4. Sound-absorbing component;

[0031] 11. Second boss; 12. Third boss; 13. Fourth boss; 14. Noise reduction hole; 15. First groove; 16. Second groove; 17. Third groove;

[0032] 31. First diffusion groove; 32. Second diffusion groove; 33. Third diffusion groove; 34. Fourth diffusion groove; 35. Fifth diffusion groove; 36. Sixth diffusion groove. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] like Figure 1 As shown, this embodiment provides a range hood, which includes a range hood housing 100. Inside the housing 100 are a fan assembly 200 and a noise reduction device. The noise reduction device is used to reduce the noise generated by the fan assembly 200 during operation. This noise can be low-frequency vibration noise or mid-to-high-frequency air noise caused by airflow turbulence.

[0038] like Figure 2 The principle of sound wave reflection and diffusion is illustrated. When a sound wave is incident on a plane, it undergoes directional reflection at the plane. Although there is energy loss in this process, the energy of the reflected sound wave is relatively high. When a sound wave is incident on a surface with undulating geometry (such as protrusions, depressions, or irregular shapes), the incident sound wave diffuses in different directions, breaking the directional reflection of the sound wave. At the same time, due to the diffusion effect, the energy of the reflected sound wave is relatively low.

[0039] based on Figure 2 The principle of sound wave reflection and diffusion illustrated in this embodiment presents a noise reduction device for the range hood. Figure 3 , Figure 4 and Figure 5 As shown, the noise reduction device includes a noise reduction plate 1. The first side of the noise reduction plate 1 has a first protrusion 2 and multiple diffusion grooves 3. The first protrusion 2 and the multiple diffusion grooves 3 are arranged sequentially and adjacently along a first direction. The depths of the multiple diffusion grooves 3 are different, and the end face of the sidewall of each diffusion groove 3 is flush with the surface of the first protrusion 2. The noise reduction plate 1 is disposed on the inner sidewall of the range hood housing 100, and the first side of the noise reduction plate 1 faces the fan assembly 200. The X direction in the attached figure represents the first direction.

[0040] The first side of the noise reduction plate 1 is provided with a first protrusion 2 and multiple diffusion grooves 3. The grooves 3 have different depths, and the end face of the side wall of each diffusion groove 3 is flush with the surface of the first protrusion 2. The distribution and arrangement of the first protrusion 2 and multiple diffusion grooves 3 cause the noise sound waves generated when the fan assembly 200 is working to diffuse, and the noise sound waves are reflected in different directions, breaking the directional reflection of the noise sound waves. Due to the multiple reflections and refractions of the noise sound waves, the sound wave energy of the noise sound waves is greatly consumed within the range hood casing 100, effectively reducing the noise sound wave energy and thus reducing the sound transmitted to the user's ears. This noise reduction device does not occupy the space inside the range hood casing 100, does not affect the exhaust volume of the range hood, has a modular design, is easy to disassemble and assemble, and is suitable for noise reduction in various frequency bands. This noise reduction device has the characteristics of wide-band sound absorption, low airflow impedance, and modular maintenance, improving the user experience.

[0041] like Figure 5 As shown, since the noise generated by the fan assembly 200 mainly occurs at the air inlet, at least one sidewall of the range hood housing 100 opposite to the air inlet of the fan assembly 200 is provided with a noise reduction plate 1, and the first side of the noise reduction plate 1 faces the air inlet of the fan assembly 200, so as to effectively reduce the noise generated when the range hood is working. More preferably, both sidewalls of the range hood housing 100 opposite to the air inlet of the fan assembly 200 are provided with noise reduction plates 1, and the two noise reduction plates 1 are symmetrically arranged, which improves the efficiency of noise reduction. In some other embodiments, the front or rear sidewall of the range hood housing 100 may also be provided with noise reduction plates 1, which is not specifically limited here.

[0042] In some embodiments, see continue to see Figure 3 As shown, the first direction is the length direction of the noise reduction plate 1, and the width direction of the noise reduction plate 1 is the second direction. The first boss 2 and multiple diffusion grooves 3 are arranged sequentially and adjacently along the length direction of the noise reduction plate 1, and the first boss 2 and multiple diffusion grooves 3 extend along the width direction of the noise reduction plate 1. The length of the noise reduction plate 1 is adapted to the height of the range hood casing 100. The Y direction in the attached figure is the second direction.

[0043] In other embodiments, such as Figure 6 As shown, the first direction is the width direction of the noise reduction plate 1, and the length direction of the noise reduction plate 1 is the second direction. The first boss 2 and multiple diffusion grooves 3 are arranged sequentially and adjacently along the width direction of the noise reduction plate 1, and the first boss 2 and multiple diffusion grooves 3 extend along the length direction of the noise reduction plate 1. The length of the noise reduction plate 1 is adapted to the height of the range hood housing 100.

[0044] See also Figure 3 and Figure 4As shown, there are six diffusion grooves 3, which are defined as the first diffusion groove 31, the second diffusion groove 32, the third diffusion groove 33, the fourth diffusion groove 34, the fifth diffusion groove 35, and the sixth diffusion groove 36. The height of the first boss 2 is d0, the depth of the first diffusion groove 31 is d1, the depth of the second diffusion groove 32 is d2, the depth of the third diffusion groove 33 is d3, the depth of the fourth diffusion groove 34 is d4, the depth of the fifth diffusion groove 35 is d5, and the depth of the sixth diffusion groove 36 is d6, with d0:d1:d2:d3:d4:d5:d6 = 0:1:4:2:2:4:1. This design uses multiple diffusion grooves 3 with different depths, forming a certain regularity, to effectively reflect noise waves in different directions. This allows the sound energy of the noise waves to be significantly consumed within the range hood casing 100, effectively reducing the energy of the noise waves and thus reducing the sound transmitted to the user's ears.

[0045] Optionally, the depth of the first diffusion groove 31 Where c is the speed of sound, f r This is the target frequency controlled by the noise reduction device. Where c and f are... r All values ​​are known and can be obtained through c and f. r The depth d1 of the first diffusion groove 31 is calculated, and the depths of the remaining diffusion grooves 3 and the height of the first boss 2 can be calculated based on the above proportional relationship, thereby obtaining the structure of the noise reduction device that meets the noise reduction standard.

[0046] To reduce material usage, effectively lower the production cost of the noise reduction device, and simultaneously improve the structural strength of the noise reduction plate 1, see [reference to previous section]. Figure 3 As shown, in some embodiments, the second side of the noise reduction plate 1 is recessed towards the first side, and a second boss 11, a third boss 12, and a fourth boss 13 of equal height and spaced apart are formed on the first side of the noise reduction plate 1. A second diffusion groove 32 is formed between the second boss 11 and the third boss 12, and a fifth diffusion groove 35 is formed between the third boss 12 and the fourth boss 13. A first diffusion groove 31 is recessed on the second boss 11, and a first boss 2 is also formed therein. A third diffusion groove 33 and a fourth diffusion groove 34 are recessed on the third boss 12, and a sixth diffusion groove 36 is recessed on the fourth boss 13. The first boss 2 and the six diffusion grooves 3 are arranged sequentially and adjacent to each other, and the height of the sidewalls of the six diffusion grooves 3 is flush with the surface of the first boss 2. The above structure can be formed by stamping, which is convenient for processing and reduces the amount of material used. The noise reduction plate 1 has an integrally molded structure with high structural strength, is easy to disassemble and assemble, and is not easily damaged.

[0047] Optionally, such as Figure 7As shown, noise reduction holes 14 are provided on the surface of the first boss 2, the bottom of the first diffusion groove 31, the bottom of the third diffusion groove 33, the bottom of the fourth diffusion groove 34, and the bottom of the sixth diffusion groove 36. The noise reduction holes 14 can absorb noise, thereby improving the noise reduction effect of the noise reduction device.

[0048] The diameter of the noise reduction aperture 14 is 1.5mm-3mm. For example, the diameter of the noise reduction aperture 14 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3.0mm. The spacing between two adjacent noise reduction apertures 14 is 8mm-15mm. For example, the spacing between two adjacent noise reduction apertures 14 is 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm.

[0049] Combination Figure 7 and Figure 8 As shown, when the second boss 11, the third boss 12, and the fourth boss 13 are formed on the noise reduction plate 1, a groove is formed on the second side of the noise reduction plate 1. After the diffusion grooves 3 are respectively processed on the second boss 11, the third boss 12, and the fourth boss 13, the three grooves have different shapes, namely the first groove 15, the second groove 16, and the third groove 17. Sound-absorbing components 4 are filled into the first groove 15, the second groove 16, and the third groove 17, respectively. Without affecting the diffusion effect of the diffusion grooves 3 on sound waves, noise is absorbed simultaneously, further improving the noise reduction effect of the noise reduction device. The sound-absorbing component 4 matches the shape of the groove to fill it completely. The material of the sound-absorbing component 4 can be polyurethane, melamine, or two-component cotton, etc., and is not specifically limited here.

[0050] The aforementioned multiple diffusion grooves 3 have the same width, and the width of the diffusion groove 3 is greater than or equal to 25mm. This reduces variable parameters and facilitates the processing of the diffusion groove 3 without affecting the diffusion of noise sound waves.

[0051] Range hoods also include, for example Figure 5 The smoke collection chamber 300 and other structures shown are connected to the smoke hood housing 100. The fan assembly 200 can discharge the oil fumes in the smoke collection chamber 300. The specific structures are all existing technologies and will not be described in detail here.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A noise reduction device for a range hood, characterized in that, The noise reduction plate (1) includes a first boss (2) and a plurality of diffusion grooves (3) on its first side. The first boss (2) and the plurality of diffusion grooves (3) are arranged sequentially and adjacent to each other along a first direction. The groove depths of the plurality of diffusion grooves (3) are different, and the end face of the sidewall of each diffusion groove (3) is flush with the surface of the first boss (2).

2. The noise reduction device for a range hood according to claim 1, characterized in that, The diffusion groove (3) has six sections, defined as the first diffusion groove (31), the second diffusion groove (32), the third diffusion groove (33), the fourth diffusion groove (34), the fifth diffusion groove (35), and the sixth diffusion groove (36). The height of the first boss (2) is d0, the depth of the first diffusion groove (31) is d1, the depth of the second diffusion groove (32) is d2, the depth of the third diffusion groove (33) is d3, the depth of the fourth diffusion groove (34) is d4, the depth of the fifth diffusion groove (35) is d5, and the depth of the sixth diffusion groove (36) is d6. d0:d1: d2： d3:d4:d5:d6=0:1:4:2:2:4:

1.

3. The noise reduction device for a range hood according to claim 2, characterized in that, Depth of the first diffusion groove (31) Where c is the speed of sound, f r The target frequency controlled by the noise reduction device.

4. The noise reduction device for a range hood according to claim 2, characterized in that, The second side of the noise reduction plate (1) is recessed towards the first side, and a second boss (11), a third boss (12) and a fourth boss (13) of the same height are formed on the first side of the noise reduction plate (1). A second diffusion groove (32) is formed between the second boss (11) and the third boss (12), and a fifth diffusion groove (35) is formed between the third boss (12) and the fourth boss (13). The first diffusion groove (31) is recessed on the second boss (11), and the first boss (2) is formed at the same time. The third diffusion groove (33) and the fourth diffusion groove (34) are recessed on the third boss (12), and the sixth diffusion groove (36) is recessed on the fourth boss (13).

5. The noise reduction device for a range hood according to claim 4, characterized in that, Noise reduction holes (14) are provided on the surface of the first boss (2), the bottom of the first diffusion groove (31), the bottom of the third diffusion groove (33), the bottom of the fourth diffusion groove (34), and the bottom of the sixth diffusion groove (36).

6. The noise reduction device for a range hood according to claim 5, characterized in that, The diameter of the noise reduction hole (14) is 1.5mm-3mm, and the distance between two adjacent noise reduction holes (14) is 8mm-15mm.

7. The noise reduction device for a range hood according to claim 5, characterized in that, The second side of the noise reduction plate (1) has a first groove (15), a second groove (16) and a third groove (17), and the first groove (15), the second groove (16) and the third groove (17) are respectively filled with sound-absorbing elements (4).

8. The noise reduction device for a range hood according to any one of claims 1-7, characterized in that, The multiple diffusion grooves (3) have the same width, and the width of the diffusion grooves (3) is greater than or equal to 25 mm.

9. The noise reduction device for a range hood according to any one of claims 1-7, characterized in that, The first direction is the length direction of the noise reduction plate (1), the width direction of the noise reduction plate (1) is the second direction, the first boss (2) and the plurality of diffusion grooves (3) are arranged sequentially and adjacently along the length direction of the noise reduction plate (1), and the first boss (2) and the plurality of diffusion grooves (3) extend along the width direction of the noise reduction plate (1). Alternatively, the first direction is the width direction of the noise reduction plate (1), the length direction of the noise reduction plate (1) is the second direction, the first boss (2) and the plurality of diffusion grooves (3) are arranged sequentially and adjacently along the width direction of the noise reduction plate (1), and the first boss (2) and the plurality of diffusion grooves (3) extend along the length direction of the noise reduction plate (1).

10. A range hood, characterized in that, The range hood includes a range hood housing (100), and a fan assembly (200) and a noise reduction device for the range hood according to any one of claims 1-9 are provided inside the range hood housing (100). The noise reduction plate (1) is provided on the inner side wall of the range hood housing (100), and the first side of the noise reduction plate (1) faces the fan assembly (200).

11. The range hood according to claim 10, characterized in that, The noise reduction plate (1) is provided on at least one side wall of the smoke hood housing (100) opposite to the air inlet of the fan assembly (200), and the first side of the noise reduction plate (1) faces the air inlet of the fan assembly (200).

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