A noise reduction component and a range hood

Abstract

The present application discloses a noise reduction component and a range hood. The noise reduction component includes a bottom plate, at least one first noise reduction member, and at least one second noise reduction member. At least one first noise reduction member is formed with two opposite open ends, one open end is connected to the bottom plate, and the distance from the other open end to the bottom plate is one quarter of the sound wave wavelength; at least one second noise reduction member is formed with two opposite open ends, one open end is connected to the bottom plate, and the other open end is provided with a micro-perforated plate; the first noise reduction member and the second noise reduction member are connected to the same side of the bottom plate, and the bottom plate seals the open ends of the first noise reduction member and the second noise reduction member. The noise reduction component of the present application can simultaneously perform noise reduction processing on narrow-band and wide-band sound waves.

Description

Technical Field

[0001] This application relates to the field of household appliances, and particularly to a noise reduction component and a range hood. Background Art

[0002] The noise reduction component is used for noise reduction processing of sound. However, the existing noise reduction components can only perform noise reduction processing on broadband or narrowband sound waves, and cannot perform noise reduction processing on both broadband and narrowband sound waves simultaneously. Summary of the Invention

[0003] This application provides a noise reduction component and a range hood to solve the problem that the existing noise reduction components cannot perform noise reduction processing on both broadband and narrowband sound waves simultaneously.

[0004] To solve the above technical problems, this application proposes a noise reduction component, which includes: a bottom plate; at least one first noise reduction member, the first noise reduction member is formed with two opposite open ends, one open end is connected to the bottom plate, and the distance from the other open end to the bottom plate is one-fourth of the sound wave wavelength; at least one second noise reduction member, the second noise reduction member is formed with two opposite open ends, one open end is connected to the bottom plate, and the other open end is provided with a micro-perforated plate; the first noise reduction member and the second noise reduction member are connected to the same side of the bottom plate, and the bottom plate seals the open ends of the first noise reduction member and the second noise reduction member.

[0005] Wherein, the first noise reduction member and the second noise reduction member are arranged and combined and connected on the bottom plate.

[0006] Wherein, the first noise reduction member includes: a first cavity and a plurality of partition plates arranged in the first cavity, and the plurality of partition plates form a meandering channel in the first cavity; the noise reduction component further includes an opening plate, the opening plate covers the open end of the first noise reduction member not connected to the bottom plate, and a first opening is provided on the opening plate, which communicates with the meandering channel.

[0007] Wherein, the first opening communicates with the end position of the meandering channel.

[0008] Wherein, the plurality of partition plates are arranged in parallel at intervals, and are alternately arranged on one of the opposite side walls of the first cavity in turn, and are respectively arranged at intervals with the other of the opposite side walls.

[0009] Wherein, in the relative direction of the two side walls, the lengths of the partition plates are equal; the distances between adjacent partition plates are equal.

[0010] Wherein, the second noise reduction member further includes a second cavity, and the micro-perforated plate covers the second cavity; the first cavity and the second cavity of the adjacent first noise reduction member and second noise reduction member share a side wall.

[0011] Wherein, the diameter of the micro-perforations on the micro-perforated plate is greater than or equal to 0.1 mm and less than or equal to 1 mm; the perforation rate of the micro-perforated plate is greater than or equal to 0.5% and less than or equal to 5%.

[0012] To solve the above technical problems, the present application proposes an oil fume extractor, which includes the noise reduction component described above.

[0013] Among them, the oil fume extractor includes a conductive upper frame and a lower frame. A fan is provided in the upper frame, and a smoke suction port is provided on the lower frame; the number of noise reduction components is at least one, which is arranged on the inner wall of the upper frame and is parallel to the central axis of the fan.

[0014] The noise reduction component of the present application includes a bottom plate, at least one first noise reduction member and at least one second noise reduction member. The first noise reduction member is formed with two opposite open ends. One open end is connected to the bottom plate, and the distance from the other open end to the bottom plate is one-fourth of the sound wave wavelength; the second noise reduction member is formed with opposite open ends. One open end is connected to the bottom plate, and the other open end is provided with a micro-perforated plate; the first noise reduction member and the second noise reduction member are connected to the same side of the bottom plate, and the bottom plate seals the open ends of the first noise reduction member and the second noise reduction member. In the above manner, the noise reduction component of the present application can simultaneously perform noise reduction processing on narrow-band and wide-band sound waves. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0016] Figure 1 is an exploded schematic view of the noise reduction component of the present application;

[0017] Figure 2 is Figure 1 the top view of the noise reduction component shown;

[0018] Figure 3 is Figure 2 the cross-sectional schematic view of A-A shown;

[0019] Figure 4 is Figure 1 the partial schematic view of the noise reduction component shown;

[0020] Figure 5 is the three-dimensional view of the oil fume extractor of the present application;

[0021] Figure 6 is Figure 5 the structural schematic view of B shown.

[0022] Reference numerals in the drawings: 1, the first noise reduction member; 11, the first cavity; 11a, the first side wall; 11b, the second side wall; 11c, the third side wall; 11d, the fourth side wall; 12, the partition; 12a, the first partition; 12b, the second partition; 13, the serpentine channel; 14, the opening plate; 141, the first opening; 2, the second noise reduction member; 21, the perforated panel; 211, the micro-perforations; 22, the second cavity; 3, the bottom plate; 100, the noise reduction assembly; 200, the range hood; 2001, the upper frame; 2002, the lower frame; 2003, the fan. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, the descriptions of "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0026] Next, a noise reduction element and a range hood provided by the present invention will be described in detail with reference to the embodiments.

[0027] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 is an exploded schematic view of the noise reduction assembly of the present application; Figure 2 is Figure 1 the top view of the noise reduction assembly shown in Figure 3 is Figure 2 the cross-sectional schematic view of A-A shown in

[0028] In this embodiment, the noise reduction component 100 includes a bottom plate 3 and at least one first noise reduction member 1. The first noise reduction member 1 can be one, two or more. When there are multiple first noise reduction members 1, their structures can be the same or different. The first noise reduction member 1 is formed with opposite open ends, one of the open ends is connected to the bottom plate 3, and the distance from the other open end to the bottom plate 3 is one quarter of the sound wave wavelength. Sound enters the first noise reduction member 1 through the other open end and is transmitted to the bottom plate 3.

[0029] The noise reduction component 100 further includes at least one second noise reduction member 2. The second noise reduction member 2 can be one, two or more. When there are multiple second noise reduction members 2, their structures can be the same or different. The second noise reduction member 2 is formed with two opposite open ends, one open end is connected to the bottom plate 3, and a micro-perforated plate 21 is provided at the other open end. The micro-perforated plate 21 is used for sound to enter the second noise reduction member 2.

[0030] Both the above-mentioned first noise reduction member 1 and second noise reduction member 2 are connected to the same side of the bottom plate 3. The bottom plate 3 blocks the open ends of the first noise reduction member 1 and the second noise reduction member 2. That is, part of the sound is transmitted to the bottom plate 3 through the other open end of the first noise reduction member 1 to be able to perform noise reduction processing on the narrow-frequency sound wave; another part of the sound enters the second noise reduction member 2 through the micro-perforated plate 21 and is transmitted to the bottom plate 3 to be able to perform noise reduction processing on the wide-frequency sound wave, so that the noise reduction component 100 can perform noise reduction processing on both narrow-frequency and wide-frequency sound waves simultaneously.

[0031] During the process of the noise reduction component 100 performing noise reduction processing on narrow-frequency and wide-frequency sound waves, in order to achieve the compactness of the noise reduction component 100, in this embodiment, the first noise reduction member 1 and the second noise reduction member 2 are arranged and combined on the bottom plate 3, such as the first noise reduction member 1 and the second noise reduction member 2 are arranged adjacent to each other in sequence, or a row of first noise reduction members 1 is staggered with an adjacent row of second noise reduction members 2, such as the arrangement mode of the first noise reduction member 1 and the second noise reduction member 2 in this embodiment. Of course, the noise reduction component 100 can also be other arrangement and combination modes, which are not limited herein. The noise reduction component 100 forms different shapes through the arrangement and combination of the first noise reduction member 1 and the second noise reduction member 2, such as a square, etc. In addition, the first noise reduction member 1 and the second noise reduction member 2 can also be of any shape, such as a square, a circle, etc., so that the noise reduction component 100 can be arranged and combined arbitrarily. Please refer to Figure 4 , Figure 4 is Figure 1 a partial schematic diagram of the noise reduction component shown.

[0032] In one embodiment, in order to increase the movement path of sound in the first noise reduction member 1, in combination with Figure 1 and Figure 2, the first noise reduction member 1 includes a first cavity 11 and a plurality of partition plates 12, wherein the partition plates 12 are arranged in the first cavity 11, and the partition plates 12 divide the first cavity 11 into intervals to form a winding channel 13, as shown by the dotted arrow in Figure 4 . The above-mentioned winding channel 13 is used for the movement of sound and increases the sound movement path. The winding channel 13 is a winding path, so that the sound can move along the winding path.

[0033] At the same time, the noise reduction component 100 further includes an opening plate 14. A first cavity 11 is formed between the opening plate 14 and the bottom plate 3, wherein the opening plate 14 covers the open end of the first noise reduction member 1 that is not connected to the bottom plate 3. In order for sound to enter the first noise reduction member 1, a first opening 141 is provided on the opening plate 14. The number of the first openings 141 can be one or more. The position of the first opening 141 is set at any position on the opening plate 14, as long as the sound can enter the first cavity 11.

[0034] Specifically, since the winding channel 13 has two ends, when the first opening 141 communicates with the end position of the winding channel 13, so that after the sound enters from the first opening 141, it enters from one end of the winding channel 13 and is transmitted to the other end of the winding channel 13, increasing the sound transmission path.

[0035] Furthermore, in order to further increase the sound transmission path, the connection mode between the plurality of partition plates 12 can be changed. For example, in this embodiment, the plurality of partition plates 12 are arranged in parallel at intervals. One end of one partition plate 12 is arranged on one of the opposite side walls of the first cavity 11, and there is an interval between the other end and the other of the opposite side walls of the first cavity 11; one end of another partition plate 12 adjacent to the above-mentioned one partition plate 12 is arranged on the other of the opposite side walls of the first cavity 11, and there is an interval between the other end and one of the opposite side walls of the first cavity 11; the other partition plates 12 in the first cavity 11 are arranged in a cyclic and staggered manner in sequence according to the above two partition plates 12. Specifically, the length of the partition plate 12 can be changed to increase the sound transmission path. For example, on the opposite directions of the opposite side walls of the first cavity 11, the extending lengths of the partition plates 12 are equal. In addition, the intervals between adjacent partition plates 12 are equal, so that the sound transmission amounts are the same.

[0036] In order to further understand the above three situations of adjusting the position and size of the first opening 141, the setting mode of the partition plate 12, and the extending length of the partition plate 12 to increase the sound movement path and improve the noise reduction effect of the first noise reduction 1. In this embodiment, the opposite side walls in the first cavity 11 are defined as the first side wall 11a, the second side wall 11b, and the other third side wall 11c and fourth side wall 11d opposite to the opposite side walls. The partition plate 12 only includes the first partition plate 12a and the second partition plate 12b.

[0037] The first is the case of the setting position of the first opening 141: The first opening 141 communicates with the end position of the meandering channel 13, that is, as Figure 4 shown, since the end of the meandering channel 13 is located at the angular position of the first cavity 11 and is close to the first side plate 11. By setting the first opening 141 at the end position of the meandering channel 13, when sound enters the first cavity 11 from this first opening 141, the sound moves from the end position of the meandering channel 13 to the other end position of the meandering channel 13.

[0038] The case of the size of the first opening 141: The length direction of the first opening 141 is the same as the extension length of the partition 12, and the width direction of the first opening 141 is smaller than the distance between adjacent partitions 12, that is, the size of the first opening 141 can increase the path of sound movement.

[0039] The second is the case of the setting of the partition 12: A plurality of partitions 12 are arranged in parallel at intervals and are alternately arranged on one of the opposite side walls of the first cavity 11 and are respectively arranged at intervals from the other of the opposite side walls. For example, one end of the first partition 12a is connected to the first side wall 11a, and the other end of the first partition 12a forms an interval with the second side wall 11b; one end of the second partition 12b is connected to the second side wall 11b, and the other end of the second partition 12b forms an interval with the first side wall 11a. Therefore, the first partition 12a, the second partition 12b and the interval form the meandering channel 13. Of course, there can be more than two partitions 12, and their setting methods are the same as those of the above-mentioned first partition 12a and second partition 12b, which are not limited here. Thus, the setting of a plurality of partitions 12 increases the length of the meandering channel 13, thereby increasing the path of sound movement.

[0040] The third is the case of the extension length of the partition 12: The extension lengths of the first partition 12a and the second partition 12b are greater than or equal to the central length of the third side wall 11c or the fourth side wall 11d of the first cavity 11, where the third side wall 11c or the fourth side wall 11d is in the same extension direction as the first partition 12a and the second partition 12b, and is less than or equal to the length of the third side wall 11c or the fourth side wall 11d, so as to increase the length of the meandering channel 13, thereby increasing the path of sound movement and preventing the sound from moving in a straight line due to the too short extension lengths of the first partition 12a and the second partition 12b, which affects the noise reduction effect.

[0041] It can be seen from this that in the first noise reduction member 1, the movement path of the meandering channel 13 can be adjusted by adjusting at least one of the three cases of the position and size of the first opening 141, the setting method of the partition 12, and the extension length of the partition 12.

[0042] Further, for the sake of the uniformity of the sound flow in the winding channel 13, in this embodiment, the lengths of the plurality of partition plates 12 facing the side wall of the first cavity 11 are equal, and at the same time, the distances between adjacent partition plates 12 are equal, so that the plurality of partition plates 12 divide the first cavity 11 into equal small cavities, making the sound flow more uniform and smooth.

[0043] In one embodiment, the second noise reduction member 2 further includes a second cavity 22, and the micro-perforated plate 21 covers the second cavity 22. Since a bottom plate 3 is provided at the bottom of the second cavity 22, the micro-perforated plate 21, the second cavity 22, and the bottom plate 3 enclose to form the second noise reduction member 2. Thus, the second noise reduction member 2 is a micro-perforated plate sound absorption structure. This micro-perforated plate sound absorption structure achieves the sound absorption effect through the principle of sound resonance, and it is mainly applied to wide-frequency sound wave noise reduction.

[0044] Since the first noise reduction member 1 and the second noise reduction member 2 are arranged and combined and connected, in order to reduce the production cost of the noise reduction assembly 100, the side walls of the first cavity 11 and the second cavity 22 in the adjacent first noise reduction member 1 and second noise reduction member 2 are shared. This not only enables the first noise reduction member 1 and the second noise reduction member 2 to respectively achieve the noise reduction effect, but also makes the structure of the noise reduction assembly 100 more compact and smaller in volume, and can reduce the production cost.

[0045] For example, as Figure 1 and 2 shown, when the second noise reduction member 2 is arranged between two rows of the first noise reduction members 1 arranged in a row, the two rows of the first noise reduction members 1 arranged in a row directly form the second cavity 22 without the need to reset the side walls, thereby reducing the production cost, having a compact structure, being easy to manufacture, and enhancing the aesthetic degree.

[0046] For example, the first cavities 11 of the plurality of first noise reduction members 1 enclose to form the second cavity 22 without the need to reset the side walls, thereby reducing the production cost and having a compact structure. Of course, the side walls of the first cavity 11 and the second cavity 22 can also be shared in other ways, which is not limited herein. Due to the different shared side wall structures of the first cavity 11 and the second cavity 22, the arrangement and combination methods of the first noise reduction member 1 and the second noise reduction member 2 will also be different, and thus the overall structure of the noise reduction assembly 100 will also be different, which is not limited herein.

[0047] Since the second noise reduction member 2 is a micro-perforated plate sound absorption structure, the above micro-perforated plate sound absorption structure is related to factors such as the aperture, perforation rate, thickness of the micro-perforated plate 21, and depth of the second cavity 22. For example, the thickness of the micro-perforated plate 21 affects the resonance frequency absorption coefficient. The aperture and perforation rate of the micro-perforations 211 both affect the width of the absorption frequency band, the position of the resonance frequency band, and the absorption coefficient at the absorption resonance frequency. The depth of the second cavity 22 mainly affects the resonance frequency. Of course, the noise reduction effect of the second noise reduction member 2 is also related to other factors, which is not limited herein.

[0048] Specifically, in this embodiment, the diameter of the micro-perforations 211 on the micro-perforated plate 21 is greater than or equal to 0.1 mm and less than or equal to 1 mm; the perforation rate of the micro-perforated plate 21 is greater than or equal to 0.5% and less than or equal to 5%. That is, the diameter of the micro-perforations 211 and the perforation rate act together to make the second noise reduction member 2 have a better noise reduction effect. The diameter of the above micro-perforations 211 can be 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, etc. The perforation rate is the sum of the areas of the micro-perforations 211 divided by the total area of the micro-perforated plate 21, and the perforation rate can be 0.5%, 1%, 2%, 3.5%, 5%, etc.

[0049] In the actual process, according to the different application scenarios of the noise reduction component 100, at least one of the factors such as the aperture diameter of the micro-perforated plate 21, the perforation rate, the thickness of the micro-perforated plate 21, and the depth of the second cavity 22 in the second noise reduction member 2 can be adjusted so that the second noise reduction member 2 is suitable for different application scenarios.

[0050] Thus, the noise reduction component 100 can meet different noise reduction requirements by adjusting the structures of the first noise reduction member 1 and / or the second noise reduction member 2. For example, when the structures of multiple first noise reduction members 1 are the same, they are used to reduce the noise of the same broadband sound wave. When the structures of multiple first noise reduction members 1 are different, they are used to reduce the noise of broadband sound waves in different ranges. Similarly, when the structures of multiple second noise reduction members 2 are the same, they are used to reduce the noise of the same narrowband sound wave; when the structures of multiple second noise reduction members 2 are different, they are used to reduce the noise of narrowband sound waves in different ranges. Therefore, the setting methods of the structures of multiple first noise reduction members 1 and second noise reduction members 2 in the noise reduction component 100 are determined according to requirements and are not limited herein.

[0051] When the first noise reduction member 1 and the second noise reduction member 2 are combined and arranged to form the noise reduction component 100, in order to improve the structural compactness of the noise reduction component 100, in this embodiment, the first noise reduction member 1 and the second noise reduction member 2 have the same height and are arranged in parallel, and the opening plate 14 on the first noise reduction member 1 and the micro-perforated plate 21 on the second noise reduction member 2 are arranged in parallel. For the convenience of processing the noise reduction component 100, the opening plate 12 and the micro-perforated plate 21 can be integrally formed.

[0052] The principle of the first noise reduction member 1 in the noise reduction component 100 is as follows: when the sound wave enters the first noise reduction member 1 from the opening, the sound wave is reflected back to the opening by the bottom plate 3, and the sound waves of certain frequencies cancel each other out with the sound waves of the same frequency in the external environment due to the opposite phases, achieving the purpose of noise elimination. The noise elimination principle of the second noise reduction member 2 in the noise reduction component 100 is as follows: micro-perforations 211 are opened on the micro-perforated plate 21, and there is a certain cavity behind the micro-perforated plate 21, that is, a micro-perforated plate noise elimination structure is formed.

[0053] The noise reduction component of this embodiment includes a bottom plate, at least one first noise reduction member, and at least one second noise reduction member. The first noise reduction member is formed with two opposite open ends, one open end is connected to the bottom plate, and the distance from the other open end to the bottom plate is one-quarter of the sound wave wavelength; the second noise reduction member is formed with opposite open ends, one open end is connected to the bottom plate, and a micro-perforated plate is provided at the other open end; the first noise reduction member and the second noise reduction member are connected to the same side of the bottom plate, and the bottom plate seals the open ends of the first noise reduction member and the second noise reduction member. In the above manner, the noise reduction component of this application can simultaneously perform noise reduction processing on narrow-band and wide-band sound waves.

[0054] Please refer to Figure 5 and Figure 6 , Figure 5 is a three-dimensional view of the range hood of this application; Figure 6 is Figure 5 the structural schematic diagram of B shown in

[0055] When the range hood 200 is working, the blower 2003 is the main noise source of the range hood 200. The noise generated by the blower 2003 is basically transmitted from the air inlet of the blower 2003 and the air outlet of the blower 2003. Since there is generally a hose connected to the outside at the air outlet of the blower 2003, the noise at the air outlet has relatively little impact on the user. However, the noise at the air inlet of the blower 2003 will be transmitted to the entire kitchen through other structures of the range hood 200, so it has a great impact on the user.

[0056] Therefore, in this embodiment, the range hood 200 includes a noise reduction component 100. The noise reduction component 100 simultaneously performs noise reduction processing on wide-band and narrow-band sound waves in the noise at the air inlet of the blower 2003, improves the noise reduction effect, and further reduces the noise of the range hood 200. It should be noted that the noise reduction component 100 in this embodiment is the noise reduction component 100 described in the above embodiment, which will not be elaborated here.

[0057] Specifically, the range hood 200 includes an upper frame 2001 and a lower frame 2002. The upper frame 2001 and the lower frame 2002 are conductively arranged. The lower frame 2002 is provided with a smoke extraction port for the oil fume to pass through. A blower 2003 is arranged in the upper frame 2001, and the blower 2003 is used to extract oil fume from the smoke extraction port. Thus, the noise reduction component 100 is installed at the position of the air inlet of the blower 2003 in the upper frame 2001, and its specific installation position is not limited.

[0058] In the actual process, in order to prevent the noise reduction component 100 from being disposed between the upper frame 2001 and the lower frame 2002, which may affect the ventilation of the smoke extraction port; and at the same time prevent the noise reduction component 100 from being disposed on the central axis of the fan 2003, which may affect the smoke extraction of the fan 2003. Therefore, in this embodiment, the noise reduction component 100 is disposed on the side wall of the upper frame 2001 and is located on the side of the central axis of the fan 2003. The side wall of the upper frame 2001 is parallel to the central axis of the fan 2003.

[0059] Since the noise reduction component 100 can be one, two or more, when there are multiple noise reduction components 100, they can be disposed on the corresponding side walls of the upper frame 2001 on both sides of the central axis of the fan 2003. Of course, it can also be disposed only on one of the two side walls of the upper frame 2001, which is not limited herein. The setting position of the noise reduction component 100 can not only reduce the noise at the air inlet of the fan 2003, improve the noise reduction effect, and thus reduce the noise of the range hood 200, but also reduce the ventilation requirement of the range hood 200.

[0060] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A noise reduction component, characterized in that, The noise reduction component includes: A bottom plate; At least one first noise reduction member, which is formed with two opposite open ends, one open end is connected to the bottom plate, and the distance from the other open end to the bottom plate is one quarter of the sound wave wavelength; At least one second noise reduction member, which is formed with two opposite open ends, one open end is connected to the bottom plate, and the other open end is provided with a perforated panel; The first noise reduction member and the second noise reduction member are connected to the same side of the bottom plate, and the bottom plate seals the open ends of the first noise reduction member and the second noise reduction member. The first noise reduction member is used for noise reduction processing of narrow frequency bands; the second noise reduction member is used for noise reduction processing of wide frequency bands; The first noise reduction member includes: a first cavity and a plurality of partition plates arranged in the first cavity. The plurality of partition plates form a meandering channel in the first cavity; the noise reduction component further includes an opening plate, which covers the open end of the first noise reduction member not connected to the bottom plate, and a first opening is provided on the opening plate, which communicates with the meandering channel, and the distance from the first opening to the bottom plate is one quarter of the sound wave wavelength; The second noise reduction member further includes a second cavity, and the perforated panel covers the second cavity; the first cavity and the second cavity of adjacent first noise reduction members and second noise reduction members share side walls.

2. The noise reduction component according to claim 1, wherein The first noise reduction member and the second noise reduction member are arranged and combined and connected on the bottom plate.

3. The noise reduction component according to claim 1, wherein The first opening communicates with the end position of the meandering channel.

4. The noise reduction component according to claim 1, characterized in that, The plurality of partition plates are arranged in parallel at intervals, are alternately arranged on one of the opposite side walls of the first cavity in sequence, and are respectively arranged at intervals with the other of the opposite side walls.

5. The noise reduction component according to claim 4, wherein In the relative direction of the two side walls, the lengths of the partition plates are equal; the distances between adjacent partition plates are equal.

6. The noise reduction component according to claim 1, wherein The diameter of the micro-perforations on the perforated panel is greater than or equal to 0.1 mm and less than or equal to 1 mm; the perforation rate of the perforated panel is greater than or equal to 0.5% and less than or equal to 5%.

7. An oil fume extractor, characterized in that, The range hood includes the noise reduction component according to any one of claims 1-6.

8. The range hood according to claim 7, characterized in that, The range hood includes a conducting upper frame and a lower frame. A fan is arranged in the upper frame, and a smoke suction port is arranged on the lower frame; the number of the noise reduction components is at least one, which is arranged on the inner wall of the upper frame and is arranged parallel to the central axis of the fan.

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