Noise reduction device and range hood

Abstract

The utility model provides a noise reduction device and a range hood, the noise reduction device comprises a first noise reduction part and a second noise reduction part, the first noise reduction part is in a plate shape, the second noise reduction part is wound on a reel, and the second noise reduction part can be switched between a rolling state and an unfolding state; when the second noise reduction part is in the unfolded state, the second noise reduction part and the first noise reduction part are at least partially overlapped to form a double-layer structure. Due to the fact that the second noise reduction part can be switched between the rolling state and the unfolding state, the requirement for noise reduction of noise of different frequency bands can be met by switching the state of the second noise reduction part, and when the noise reduction device is applied to the extractor hood, the requirement for noise reduction of the extractor hood can be met; and the problem that the noise reduction device occupies too much space in the machine shell, air circulation in the range hood is affected, and then the smoke suction effect of the range hood is affected can be solved, and the use experience of a user is improved.

Description

Technical Field

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

[0002] As people's quality of life improves, their expectations for kitchen cooking environments are also growing. Range hoods have become an indispensable appliance in modern homes. However, while pursuing high air volume and pressure, the noise generated by range hoods during operation is also increasing. This not only affects the user's cooking experience but can also harm their physical and mental health.

[0003] In order to reduce the noise of the range hood, sound-absorbing materials are usually installed in the casing to reduce the noise. However, the noise reduction ability is limited due to reasons such as the limited space inside the casing. Moreover, since the sound-absorbing materials occupy too much space inside the casing, the air circulation in the range hood is affected, which in turn affects the smoke extraction effect of the range hood. In addition, the sound-absorbing materials are usually only fixedly installed in the casing, so they can only reduce the noise of a single frequency band. The range hood generally has different wind speed levels. After adjusting the wind speed level of the range hood, noise of different frequency bands will be generated. This results in the situation that noise of other different frequency bands cannot be reduced. Utility Model Content

[0004] In order to at least partially solve the problems existing in the prior art, according to one aspect of the present invention, a noise reduction device is provided, and the technical solution is as follows.

[0005] The noise reduction device includes a first noise reduction member, which is configured in a plate shape; and a second noise reduction member, which is wound on a reel and can be switched between a reeled state and an unfolded state; wherein, when the second noise reduction member is in the unfolded state, the second noise reduction member and the first noise reduction member at least partially overlap to form a double-layer structure.

[0006] The noise reduction device of the present invention has a second noise reduction component that can be switched between a retracted state and an unfolded state. When the noise is in a low frequency band, the second noise reduction component can be in a retracted state. At this time, the first noise reduction component can meet the noise reduction needs of the low frequency band, thereby ensuring the noise reduction effect of the noise reduction device and saving space. When the noise is in a high frequency band, the second noise reduction component can be in an unfolded state, and the second noise reduction component and the first noise reduction component at least partially overlap to form a double-layer structure. At this time, the noise reduction device can meet the noise reduction needs of the high frequency band. By switching the state of the second noise reduction component, the noise reduction needs of noises in different frequency bands can be met. In this way, when the noise reduction device is applied to a range hood, it can not only meet the noise reduction needs of the range hood, but also avoid the problem that the noise reduction device occupies too much space inside the casing, which affects the air circulation in the range hood and further affects the smoking effect of the range hood, thereby improving the user experience.

[0007] For example, a storage tray is provided on the outer periphery of the reel, and the storage tray has an arc-shaped cavity. When the second noise reduction member is in the reeled state, at least a portion of the second noise reduction member is stored in the arc-shaped cavity. This arrangement allows the storage tray to store the reeled second noise reduction member, protecting it while also constraining it to a certain extent after reeling, preventing it from becoming loose. Storing the second noise reduction member in the arc-shaped cavity protects it and prevents it from being contaminated by oil, which could affect the noise reduction effect.

[0008] For example, the storage tray includes a curved body and an extension. The curved body encloses a curved cavity, and the extensions extend from both sides of the curved body toward the outside of the curved cavity to form an oil scraping edge. This arrangement allows the oil scraping edge to scrape off oil stains on the second noise reduction element to clean it, preventing the second noise reduction element from being corroded by oil smoke for a long time and affecting its noise reduction effect, thereby extending the service life of the second noise reduction element.

[0009] For example, the second noise reduction member has a first thickness H1 and an unfolded length L1, the arc-shaped body has a first radius R1, and the scroll has a second radius R2. The relationship between the first thickness H1, unfolded length L1, first radius R1, and second radius R2 is: (H1×L1) / 4=π(R12-R22). With this configuration, when the first thickness H1, unfolded length L1, first radius R1, and second radius R2 have this relationship, the arc-shaped body can compress the second noise reduction member to squeeze out oil stains in the second noise reduction member. The expelled oil stains can be scraped off by the scraping edge, further preventing the second noise reduction member from being corroded by oil smoke and affecting the noise reduction effect, and reducing the space occupied by the second noise reduction member. Thus, when the noise reduction device is applied to a range hood, it not only meets the noise reduction requirements of the range hood, but also avoids the problem of the noise reduction device occupying too much space inside the range hood casing, which could affect the air circulation within the range hood and thus the smoke extraction effect of the range hood, thereby improving the user experience.

[0010] For example, the first thickness H1 is 10 mm to 30 mm. When the first thickness H1 is within this range, the noise reduction effect of the second noise reduction member is ensured, and when the noise reduction device is applied to a range hood, the second noise reduction member is prevented from occupying too much space inside the housing and affecting the range hood's smoke extraction effect.

[0011] For example, a fixing seat is connected to the outer wall of the arc-shaped body outside the arc-shaped cavity. In this way, the fixing seat can support the arc-shaped body and avoid the arc-shaped body from becoming unstable during the process of retracting the second noise reduction member.

[0012] For example, the reel has a first end and a second end, both of which extend outside the arcuate cavity, and one of the first end and the second end is connected to a drive member that drives the reel. This arrangement allows the drive member to smoothly switch between the retracted and deployed states of the second noise reduction member, saving effort and facilitating operation, thereby enhancing the user experience.

[0013] For example, the first noise reduction member has a first side and a second side, with a reel located on the first side and a rotating wheel mounted on the second side. The reel and the rotating wheel are connected via a transmission member. The second noise reduction member has a fixed side and a free side, with the fixed side mounted on the reel and the free side connected to the transmission member. This arrangement ensures that the second noise reduction member can be smoothly deployed on the first noise reduction member, and the rotating wheel can reduce friction during the winding and unwinding processes, making winding and unwinding of the second noise reduction member smoother.

[0014] For example, the reel has two connecting sections at either end of the second noise reduction member, each with a groove. The conveyor member, which passes around the rotating wheel, connects to the groove. This arrangement constrains the position of the conveyor member and reduces friction during the winding and unwinding processes, further ensuring that the second noise reduction member can be smoothly laid out on the first noise reduction member.

[0015] For example, when the second noise reduction member is in the deployed state, a gap M is provided between the second noise reduction member and the first noise reduction member, and the gap M is no greater than 5 mm. When the gap M is within this range, the noise reduction effect of the noise reduction device can be effectively maintained while saving space.

[0016] For example, the first noise reduction component includes a noise reduction plate and a noise reduction component. The noise reduction plate encloses a housing cavity, and the noise reduction component is installed in the housing cavity. This arrangement protects the noise reduction component from damage and prevents it from being corroded by oil smoke, which could affect the noise reduction effect.

[0017] For example, the noise reduction plate comprises a plate body, with four sides of the plate body bent to form flanges. The flanges and the plate body enclose a receiving cavity, and the plate body is provided with evenly distributed through-holes. This arrangement enhances the noise reduction effect of the first noise reduction member, allowing noise to pass through the through-holes and reach the noise reduction member located in the receiving cavity, thereby reducing the noise.

[0018] For example, the through hole has an aperture D1 of 2 mm to 8 mm. When the aperture D1 is within this range, it is ensured that noise can pass through the through hole and be reduced by the noise reduction member, thereby ensuring the noise reduction effect of the first noise reduction member.

[0019] For example, there is a hole spacing D2 between two adjacent through holes, and the hole spacing D2 is 5 mm to 12 mm. When the hole spacing D2 is within this range, the first noise reduction component is guaranteed to have a noise reduction effect on low-frequency noise.

[0020] For example, a snap-fitting piece is rotatably connected to the flange, and a clamping groove is provided on the snap-fitting piece. In this way, the noise reduction plate can be installed or removed by rotating the snap-fitting piece, which is simple to operate and convenient for cleaning or replacing the noise reduction piece, thereby improving the user experience.

[0021] For example, the clamping member includes a first body, a second body, and a connector. The first body opposes the second body, and the connector is connected between the first and second bodies. The first, second, and connectors together form a clamping groove. This arrangement offers a simple structure and ease of fabrication. Furthermore, this structure allows for fast installation and removal of the noise reduction plate, making it easy to clean or replace the noise reduction member.

[0022] For example, a connecting pin is provided on one of the first body and the second body, and a connecting hole is provided on the flange, and the connecting pin is inserted into the connecting hole. This arrangement enables the clamping member to rotate relative to the flange, has a simple structure, and is easy to process.

[0023] For example, the noise reduction member has a second thickness H2, which is 5 mm to 10 mm. When the second thickness H2 is within this range, the noise reduction member can effectively reduce low-frequency noise while saving space.

[0024] According to another aspect of the present invention, a range hood is provided, comprising a housing, a fan, and the noise reduction device described above. The housing encloses a receiving cavity, and the fan is mounted within the receiving cavity. The housing has a mounting backplate, and the first noise reduction member is mounted on a surface of the mounting backplate facing the receiving cavity. This places the noise reduction device closer to the sound source, thereby achieving more effective noise reduction. Since the noise reduction device described above has the aforementioned beneficial effects, a range hood including the noise reduction device also has the aforementioned beneficial effects, which will not be further elaborated here.

[0025] The Summary of the Utility Model introduces a series of simplified concepts, which will be further described in detail in the Detailed Description of the Utility Model. This Summary of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0026] The advantages and features of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0028] Figure 1 A top view of a portion of a range hood according to an exemplary embodiment of the present invention (the second noise reduction member is in an unfolded state);

[0029] Figure 2 for Figure 1 A top view of a portion of the range hood shown (with the second noise reduction member in a retracted state);

[0030] Figure 3 for Figure 1 A perspective view of a portion of the noise reduction device of a range hood is shown;

[0031] Figure 4 for Figure 3 A perspective view of the storage tray shown;

[0032] Figure 5 for Figure 3 a perspective view of the scroll shown;

[0033] Figure 6 for Figure 1 An exploded view of the first noise reduction member is shown;

[0034] Figure 7 for Figure 6 Enlarged view of part A in the middle;

[0035] Figure 8 for Figure 1 A three-dimensional diagram of the noise reduction plate, the clip and the connecting plate after being assembled;

[0036] Figure 9 for Figure 8 Enlarged view of middle part B;

[0037] Figure 10 for Figure 8 Enlarged view of the middle C section;

[0038] Figure 11 for Figure 8 A cross-sectional view of the clip shown.

[0039] The above drawings include the following reference numerals:

[0040] 10. Noise reduction device; 110. First noise reduction member; 111. Noise reduction plate; 1111. Plate body; 1111a. Through hole; 1112. Flanged edge; 1112a. Connecting hole; 1112b. Extension; 112. Noise reduction member; 113. First side; 114. Second side; 120. Second noise reduction member; 121. Fixed side; 122. Free side; 130. Reel; 131. First end; 132. Second end; 1321. Fixed section; 133. Connecting section; 1331. Groove; 1332. Protruding stop; 140. Storage tray; 14 1. Arc-shaped cavity; 142. Arc-shaped body; 143. Extension body; 1431. Oil scraping edge; 144. Fixed seat; 150. Driving member; 161. Rotating wheel; 162. Transmission member; 170. Support seat; 171. Bearing hole; 180. Snap-fit member; 181. First body; 182. Second body; 183. Connecting body; 184. Clamping groove; 185. Connecting pin; 186. Guide groove; 190. Connecting plate; 191. Fixing part; 192. Connecting part; 20. Casing; 210. Accommodating cavity; 220. Mounting back plate; 30. Fan. DETAILED DESCRIPTION

[0041] In the following description, numerous details are provided to facilitate a thorough understanding of the present invention. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the present invention, and that the present invention may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well known in the art have not been described in detail.

[0042] To thoroughly understand the embodiments of the present invention, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below; however, in addition to these detailed descriptions, the present invention may also have other embodiments. For household range hoods, when the fan is running at high speed, airflow noise is generated. This noise is particularly noticeable at higher wind speeds. The components within the range hood may generate mechanical vibrations during operation, which also cause noise. Noise can harm the human body in many ways. Noise can affect the human nervous system, leading to symptoms of neurasthenia such as headaches, dizziness, insomnia, and memory loss. Noise can also affect a person's psychology and emotions, increasing psychological stress and causing irritability and anxiety. To address the above issues, an embodiment of the present invention provides a noise reduction device. The noise reduction device provided by the present invention can be used in range hoods. The following detailed description of a noise reduction device according to an embodiment of the present invention is provided in conjunction with the accompanying drawings.

[0043] See also Figure 1 and Figure 2 The noise reduction device 10 may include a first noise reduction member 110 and a second noise reduction member 120. The first noise reduction member 110 may be plate-shaped. The second noise reduction member 120 may be wound around a reel 130 and switchable between a reeled state and an unfolded state. When the second noise reduction member 120 is in the unfolded state, the second noise reduction member 120 and the first noise reduction member 110 may at least partially overlap to form a double-layer structure.

[0044] In the noise reduction device 10 of the present invention, since the second noise reduction member 120 can be switched between a retracted state and an unfolded state, when the noise is in a low frequency band, the second noise reduction member 120 can be in the retracted state. At this time, the first noise reduction member 110 can meet the noise reduction requirements of the low frequency band, ensuring the noise reduction effect of the noise reduction device 10 while saving space. When the noise is in a high frequency band, the second noise reduction member 120 can be in the unfolded state, and the second noise reduction member 120 and the first noise reduction member 110 at least partially overlap to form a double-layer structure. At this time, the noise reduction device 10 can meet the noise reduction requirements of the high frequency band. By switching the state of the second noise reduction member 120, the noise reduction requirements of noises in different frequency bands can be met. In this way, when the noise reduction device 10 is applied to a range hood, it can not only meet the noise reduction requirements of the range hood, but also avoid the problem that the noise reduction device 10 occupies too much space inside the casing 20, which affects the air circulation in the range hood and further affects the smoking effect of the range hood, thereby improving the user experience.

[0045] Furthermore, the first and second noise reduction elements 110, 120 can be made of sound-absorbing materials. For example, they can be made of sound-absorbing cotton. Sound-absorbing cotton has excellent noise reduction capabilities and can effectively reduce noise. Furthermore, due to its porosity and softness, sound-absorbing cotton can be compressed and folded into various shapes as needed. To ensure good noise reduction and save space, the sound-absorbing cotton of the second noise reduction element 120 can be thicker than that of the first noise reduction element 110. Of course, it is possible that the sound-absorbing cotton of the second noise reduction element 120 can be thinner than that of the first noise reduction element 110. Specifically, when deployed, the second noise reduction element 120 and the first noise reduction element 110 overlap by at least 80%, forming a double-layer structure. In this way, the noise reduction device 10 can effectively reduce high-frequency noise.

[0046] See also Figures 1 to 4A storage tray 140 may be provided on the outer periphery of the reel 130. The storage tray 140 may have an arc-shaped cavity 141. When the second noise reducer 120 is in the reeled state, at least a portion of the second noise reducer 120 may be stored within the arc-shaped cavity 141. It is understood that the second noise reducer 120 may have a certain degree of flexibility and elasticity. If the reeled second noise reducer 120 is not restrained, it may become loose or even unable to be reeled onto the reel 130. The storage tray 140 can store the reeled second noise reducer 120, protecting it while also restraining it to prevent it from becoming loose. Storing the second noise reducer 120 within the arc-shaped cavity 141 protects it and prevents it from being contaminated by oil, which could affect the noise reduction effect. Of course, it is not excluded that the storage tray 140 may have a rectangular cavity or a polygonal cavity, etc.

[0047] See also Figure 3 and Figure 4 The storage tray 140 may include a curved body 142 and an extension 143. The curved body 142 may enclose a curved cavity 141. The extension 143 may extend from both sides of the curved body 142 toward the outside of the curved cavity 141 to form an oil scraping edge 1431. The oil scraping edge 1431 may scrape off the oil stains on the second noise reducer 120 to clean the second noise reducer 120, thereby preventing the second noise reducer 120 from being corroded by oil smoke for a long time and affecting the noise reduction effect, and extending the service life of the second noise reducer 120. It is understandable that the second noise reducer 120 is located inside the housing 20 for a long time, and oil stains are easily attached to its surface or the sound-absorbing holes that absorb noise. The oil stains may prevent the noise from being absorbed by the second noise reducer 120, thereby affecting the noise reduction effect of the second noise reducer 120.

[0048] Specifically, the extension body 143 and the curved body 142 can be an integrated structure. This simple structure is easy to manufacture and process, saving costs. Of course, the extension body 143 can also be fixedly mounted on the curved body 142 by welding or other methods. The extension body 143 and the curved body 142 can also be separate structures. For example, the extension body 143 can be mounted on the curved body 142 by snapping, gluing, or other methods. If the extension body 143 becomes dirty or damaged, it can be removed for cleaning and replacement, improving the user experience.

[0049] See also Figures 1 to 5The second noise reducer 120 may have a first thickness H1 and an extended length L1. The arc-shaped body 142 may have a first radius R1. The reel 130 may have a second radius R2. The relationship between the first thickness H1, extended length L1, first radius R1, and second radius R2 may be: (H1 × L1) / 4 = π(R12 - R22). When the first thickness H1, extended length L1, first radius R1, and second radius R2 have this relationship, the arc-shaped body may compress the second noise reducer 120, squeezing out oil contaminants within the second noise reducer 120. Exhausted oil can be scraped off by the scraping edge 1431, further preventing the second noise reduction member 120 from being corroded by oil smoke and thus affecting the noise reduction effect. It also reduces the space occupied by the second noise reduction member 120. Thus, when the noise reduction device 10 is applied to a range hood, it not only meets the noise reduction requirements of the range hood, but also prevents the noise reduction device 10 from occupying excessive space within the range hood casing 20, thereby affecting air circulation within the range hood and, in turn, the range hood's extraction efficiency. Specifically, the storage tray 140 can compress the volume of the second noise reduction member 120 to 1 / 4 of its original volume. This significantly reduces the space occupied by the second noise reduction member 120, further conserving space within the casing 20 and further preventing the noise reduction device 10 from occupying excessive space within the casing 20 and thus affecting the range hood's extraction efficiency.

[0050] See Figure 1 , the first thickness H1 can be 10mm to 30mm. For example, the first thickness H1 can be 10mm, 20mm, 30mm, etc. When the first thickness H1 is within this range, the noise reduction effect of the second noise reduction member 120 is guaranteed, and when the noise reduction device 10 is applied to a range hood, the second noise reduction member 120 is prevented from occupying too much space inside the housing 20 and affecting the smoke extraction effect of the range hood. The optimal value of the first thickness H1 can be 20mm, which effectively guarantees the noise reduction effect of the second noise reduction member 120 and effectively prevents the second noise reduction member 120 from occupying too much space inside the housing 20 and affecting the smoke extraction effect of the range hood.

[0051] See also Figure 3 and Figure 4, the curved body 142 is located on the outer side wall outside the curved cavity 141 and can be connected to a fixing seat 144. Specifically, the curved body 142 can be fixedly connected to the fixing seat 144 by means of screws, welding, etc. Of course, the curved body 142 and the fixing seat 144 can also be fixedly connected together by other connection methods. It is understandable that during the process of winding and compressing the second noise reduction member 120, the force acting on the curved body 142 is very large. If the curved body 142 is not fixed or the fixing structure is not strong enough, the curved body 142 may shake and fail to compress the second noise reduction member 120, and may even cause damage to the curved body 142. The fixing seat 144 can support the curved body 142, thereby preventing the curved body 142 from becoming unstable during the process of winding the second noise reduction member 120.

[0052] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 5The reel 130 may have a first end 131 and a second end 132. Both the first end 131 and the second end 132 may extend outside the arc-shaped cavity 141, and one of the first end 131 and the second end 132 may be connected to a driving member 150 that drives the reel 130 to rotate. The one of the first end 131 and the second end 132 that is not connected to the driving member 150 may extend into the bearing hole 171 of the support seat 170. The one of the first end 131 and the second end 132 that is connected to the driving member 150 may have a fixed section 1321. The fixed section 1321 may extend into the driving member 150 and be fixedly connected to the driving member 150, thereby further strengthening the connection between the reel 130 and the driving member 150. The fixed section 1321 may be fixedly connected to the driving member 150 via a coupling (not shown in the figure). The driving member 150 may be a motor. For example, the driving member 150 may be a reduction motor. The reduction motor can increase the output torque by reducing the speed of the motor, so that it can easily compress the second noise reduction member 120. Of course, the driving member 150 can also be an eccentric motor, etc. Furthermore, an input component (not shown in the figure) and a controller (not shown in the figure) can be provided on the range hood. The input component can be a button, a knob, a touch screen, etc. The user can input control information to the controller through the input component, and then control the working state of the driving member 150, which is convenient to operate and improves the user experience. Specifically, the second end 132 can be connected to the driving member 150, and the first end 131 can be extended into the bearing hole 171 of the support seat 170. One end of the reel 130 extends into the support seat 170 to support the reel 130 and make the rotation of the reel 130 more stable. The bearing hole 171 opened in the support seat 170 can make the rotation of the reel 130 smoother. In this way, the second noise reduction member 120 can be switched more smoothly between the retracted state and the unfolded state through the driving member 150, which saves effort and is easy to operate, thereby improving the user experience.

[0053] See also Figure 1 and Figure 2The first noise reducer 110 may have a first side 113 and a second side 114. The reel 130 may be located on the first side 113. A rotating wheel 161 may be provided on the second side 114. The reel 130 and rotating wheel 161 may be connected via a transmission member 162. The transmission member 162 may be a steel cable. Steel cables have high structural strength, maintain their performance even in oily environments, and are wear-resistant and resistant to damage. The second noise reducer 120 may have a fixed side 121 and a free side 122. The fixed side 121 may be provided on the reel 130. This prevents the second noise reducer 120 from falling off the reel 130 due to excessive unwinding. The free side 122 may be connected to the transmission member 162. This ensures that the second noise reducer 120 can be smoothly laid out on the first noise reducer 110. The rotating wheel 161 reduces friction during the winding and unwinding processes, making winding and unwinding of the second noise reducer 120 smoother. Specifically, when the transmission member 162 is a steel cable, one end of the steel cable is connected to the free side 122 of the second noise reduction member 120 and passed over a roller. The other end can be connected to the reel 130. The transmission member 162 and the free side 122 can be connected by drilling a hole in the free side 122 and then passing the transmission member 162 through the hole. Of course, the transmission member 162 and the free side 122 can also be connected together by other means, such as gluing. The transmission member 162 can also be other structures, such as a telescopic pull rod.

[0054] Specifically, the number of rotating wheels 161 and conveying members 162 can both be two. The two rotating wheels 161 can be mounted on either side of the second side 114 of the first noise reducer 110. The two conveying members 162 can be connected to either side of the free side 122 of the second noise reducer 120. It is understood that when the two conveying members 162 are connected to either side of the free side 122 of the second noise reducer 120, the second noise reducer 120 can be more effectively prevented from being uneven during deployment, thereby ensuring that the second noise reducer 120 is smoothly deployed on the first noise reducer 110.

[0055] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 5The reel 130 may have two connecting sections 133 located at both ends of the second noise reduction member 120. A groove 1331 may be provided on the connecting section 133. The conveying member 162 may be connected to the groove 1331 by passing around the rotating wheel 161. In this way, when the second noise reduction member 120 is in the unfolded state, the conveying member 162 may be retracted into the groove 1331. Specifically, the conveying member 162 may be connected to the groove 1331 by gluing or bundling. A protruding stop 1332 may be provided on the side of the groove 1331 near the second noise reduction member 120. It is understood that the protruding stop 1332 can effectively confine the conveying member 162 to the groove 1331, preventing interference between the conveying member 162 and the second noise reduction member 120. The groove 1331 can constrain the position of the conveying member 162 and reduce friction during the winding and unfolding processes, further ensuring that the second noise reduction member 120 can be smoothly stretched on the first noise reduction member 110 .

[0056] See Figure 1 When the second noise reduction member 120 is in the expanded state, there may be a gap M between the second noise reduction member 120 and the first noise reduction member 110. The gap M may be no greater than 5 mm. When the gap M is within this range, the noise reduction effect of the noise reduction device 10 can be effectively guaranteed, and space can be saved. It can be understood that when there is no gap M between the first noise reduction member 110 and the second noise reduction member 120, the noise reduction effect of the noise reduction device 10 is the best. When the gap M is too large, the noise reduction effect of the noise reduction device 10 may be affected. Specifically, a compression structure (not shown in the figure) can be used to compress the second noise reduction member 120 in the expanded state so that the second noise reduction member 120 fits the first noise reduction member 110 as closely as possible, reducing the gap M between the two and improving the noise reduction effect of the noise reduction device 10.

[0057] See also Figure 1 、 Figure 2 and Figure 6 , the first noise reduction member 110 may include a noise reduction plate 111 and a noise reduction member 112. The noise reduction member 112 may be made of sound-absorbing material. The noise reduction plate 111 may enclose a receiving cavity (not shown in the figure). The noise reduction member 112 may be installed in the receiving cavity. Specifically, the noise reduction member 112 may be installed in the receiving cavity by means of pasting or snap connection. It is understandable that the noise reduction plate 111 may protect the noise reduction member 112, preventing the noise reduction member 112 from being damaged while also preventing the noise reduction member 112 from being corroded by oil smoke, which may affect the noise reduction effect.

[0058] See also Figure 6 and Figure 7, the noise reduction plate 111 may have a plate body 1111. The four sides of the plate body 1111 may be bent to form a flange 1112. The flange 1112 and the plate body 1111 may be enclosed to form a receiving cavity. The plate body 1111 may be provided with evenly distributed through holes 1111a. The through holes 1111a may be circular holes to enhance the noise reduction effect. In this way, the noise reduction effect of the first noise reduction component 110 is enhanced, and the noise may pass through the through holes 1111a to reach the noise reduction component 112 located in the receiving cavity, so that the noise reduction component 112 reduces the noise. Of course, it is not ruled out that the through holes 1111a are square holes or triangular holes, etc.

[0059] Again, refer to Figure 6 and Figure 7 When the through hole 1111a is a circular hole, the through hole 1111a can have an aperture D1. The aperture D1 can be 2 mm to 8 mm. For example, the aperture D1 can be 2 mm, 4 mm, 8 mm, etc. When the aperture D1 is within this range, it is ensured that noise can pass through the through hole 1111a and be reduced by the noise reduction member 112, thereby ensuring the noise reduction effect of the first noise reduction member 110. The optimal value of the aperture D1 can be 5 mm. In this case, it is ensured that noise can effectively pass through the through hole 1111a and be reduced by the noise reduction member 112, thereby effectively ensuring the noise reduction effect of the first noise reduction member 110.

[0060] Again, refer to Figure 6 and Figure 7 Adjacent through-holes 1111a may have a hole spacing D2 between them. This spacing D2 may range from 5 mm to 12 mm. For example, the spacing D2 may be 5 mm, 8 mm, or 12 mm. Within this range, the first noise reduction element 110 is guaranteed to effectively reduce low-frequency noise. The optimal value for the spacing D2 is 10 mm. This effectively ensures the first noise reduction element 110's ability to reduce low-frequency noise.

[0061] See also Figures 6 to 11, a clip 180 can be rotatably connected to the flange 1112. The clip 180 can be provided with a clamping groove 184. Specifically, the noise reduction device 10 can also include a connecting plate 190. The connecting plate 190 can have a fixing portion 191 parallel to the plane to be installed. The fixing portion 191 can be fixedly installed on the surface to be installed by welding, screw fixing, etc. It should be noted that when the noise reduction device 10 is applied to a range hood, the surface to be installed can be the inner wall of the range hood casing 20, etc. The outer surface of the flange 1112 can have an extension portion 1112b that is bent and extended toward the plate body 1111. The extension portion 1112b can also be formed by bending and extending the end surface of the flange 1112 away from the plate body 1111. For example, the extension portion 1112b and the flange 1112 form a U-shape or a V-shape, etc. The connecting plate 190 can also have a connecting portion 192 connected to the fixing portion 191. For example, the fixing portion 191 and the connecting portion 192 can form an L-shape, a T-shape, or the like. The connecting portion 192 can fit over the extension portion 1112b. The connecting portion 192 and the extension portion 1112b can at least partially extend into the clamping groove 184. The connecting portion 192 and the extension portion 1112b form an interference fit with the clamping groove 184, preventing the connecting portion 192 and the extension portion 1112b from being removed from the clamping groove 184, thereby securing the noise reduction plate 111 to the surface to be mounted. There can be multiple extension portions 1112b. There can be multiple connecting plates 190. The connecting plates 190 can be arranged in a one-to-one correspondence with the extension portions 1112b. Preferably, there can be four extension portions 1112b. The four extension portions 1112b can be distributed at the four corners of the noise reduction plate 111. The four connecting plates 190 respectively mate with the corresponding extension portions 1112b at the four corners of the noise reduction plate 111. Thus, the clamping member 180 is rotated to the installation position (eg Figure 10 As shown in FIG. 1 ), the noise reduction plate 111 can be fixedly mounted on the surface to be mounted, and the clip 180 can be rotated to the disassembly position (as shown in FIG. Figure 9 The noise reduction plate 111 can be removed from the surface to be installed by rotating the clamping member 180. The noise reduction plate 111 can be installed or removed simply by rotating the clamping member 180. This simple operation facilitates cleaning or replacement of the noise reduction member 112, thereby improving the user experience. Of course, the noise reduction plate 111 can also be fixed to the surface to be installed using other structures.

[0062] Again, refer to Figures 8 to 11The clip 180 may include a first body 181, a second body 182 and a connector 183. The first body 181 may be opposite to the second body 182. The connector 183 may be connected between the first body 181 and the second body 182. The first body 181, the second body 182 and the connector 183 may enclose a clamping groove 184. The connector 183 is connected between the first body 181 and the second body 182, which can make the structural strength of the clip 180 higher and avoid the clip 180 being damaged during the process of the connecting portion 192 and the flange 1112 extending into the clamping groove 184. A guide groove 186 may be provided between the first body 181 and the second body 182. During the process of rotating the clip 180 to the installation position, the guide groove 186 can guide the connecting portion 192 and the extension portion 1112b so that the connecting portion 192 and the extension portion 1112b can be more smoothly extended into the clamping groove 184. In this way, the structure is simple and easy to process. Moreover, by fixing the noise reduction plate 111 through this structure, installation or disassembly can be completed quickly, and the noise reduction component 112 can be cleaned or replaced conveniently.

[0063] See also Figures 9 to 11 , a connecting pin 185 may be provided on one of the first body 181 and the second body 182. A connecting hole 1112a may be provided on the flange 1112. A connecting hole 1112a may also be provided on the extension 1112b. The connecting pin 185 may be inserted into the connecting hole 1112a. Alternatively, one or both of the first body 181 and the second body 182 may be provided with a connecting hole 1112a, and a connecting pin 185 may be provided on the flange 1112. In this way, the clamping member 180 is rotated relative to the flange 1112, and the structure is simple and easy to process. Specifically, after the connecting pin 185 is inserted into the connecting hole 1112a, it can be constrained by a limiting structure (not shown in the figure) to prevent the connecting pin 185 from falling off from the connecting hole 1112a. Of course, the clamping member 180 can also be rotatably connected to the flange 1112 through other structures. For example, the clamping member 180 and the flange 1112 can also be rotatably connected by bolts, etc.

[0064] See Figure 6 The noise reduction member 112 may have a second thickness H2. The second thickness H2 may range from 5 mm to 10 mm. For example, the second thickness H2 may be 5 mm, 8 mm, 10 mm, etc. When the second thickness H2 is within this range, the noise reduction member 112 effectively reduces low-frequency noise while saving space. The optimal value for the second thickness H2 is 10 mm, which further ensures the noise reduction member 112's noise reduction effect while effectively preventing the first noise reduction member 110 from occupying excessive space within the housing 20 and thus affecting the range hood's extraction efficiency.

[0065] According to another aspect of the present invention, a range hood is provided, comprising a housing 20, a fan 30, and the noise reduction device 10 as described above. The housing 20 encloses a receiving chamber 210, and the fan 30 is installed inside the receiving chamber 210. The housing 20 has a mounting back plate 220, and the first noise reduction component 110 is installed on the side of the mounting back plate 220 facing the receiving chamber 210. In this way, the noise reduction device 10 is closer to the sound source, thereby achieving more effective noise reduction. Of course, the first noise reduction component 110 can also be installed on various walls inside the housing 20, enclosing the fan 30 inside to achieve a better noise reduction effect. Since the noise reduction device 10 as described above has the above-mentioned beneficial effects, the range hood including the noise reduction device 10 as described above also has the above-mentioned beneficial effects, which will not be described in detail here.

[0066] See also Figure 1 and Figure 2 The second noise reducer 120 can be installed on the side of the first noise reducer 110 closer to the fan 30. As can be appreciated, when the second noise reducer 120 is in the retracted state, installing the second noise reducer 120 on the side of the first noise reducer 110 closer to the fan 30 can increase the space around the fan 30 compared to installing the second noise reducer 120 on the side of the first noise reducer 110 farther from the fan 30, thereby preventing the noise reduction device 10 from occupying too much space and thus affecting the range hood's extraction efficiency. When the second noise reducer 120 is in the deployed state, installing the second noise reducer 120 on the side of the first noise reducer 110 closer to the fan 30 can prevent grease from contaminating the first noise reducer 110, protecting the first noise reducer 110. Grease adhering to the second noise reducer 120 can also be scraped off via the storage tray 140, extending the service life of the first and second noise reducers 110, 120 and improving the user experience. The second noise reducer 120 and the first noise reducer 110 can be mounted on the mounting backplate 220. The second noise reducer 120 can also be mounted on a wall adjacent to the mounting backplate 220 where the first noise reducer 110 is mounted. Of course, the second noise reducer 120 can be mounted on various walls within the housing 20 corresponding to the first noise reducer 110, enclosing the fan 30 within for even better noise reduction.

[0067] The following describes the operation process of the noise reduction device 10 in detail, Figures 1 to 3When the range hood is running at low gear and the overall noise is in a low frequency band, the driving member 150 drives the reel 130 to rotate in the forward direction (along the X direction), and the reel 130 can drive the second noise reduction member 120 to reel, and the grooves 1331 on both sides of the reel 130 begin to release the transmission member 162 until the second noise reduction member 120 is completely reeled onto the reel 130, and the driving member 150 stops running. At this time, the second noise reduction member 120 is completely reeled onto the reel 130, and the noise reduction requirement can be met by only the noise reduction of the first noise reduction member 110. At the same time, the reeling of the second noise reduction member 120 can provide the casing 20 The inner cavity increases the air intake space, thereby improving the smoke extraction effect of the range hood; when the range hood is running at a high speed and the overall noise is in the high frequency band, the driving member 150 drives the reel 130 to rotate in the opposite direction (along the Y direction), and the grooves 1331 on both sides of the reel 130 begin to reel up the conveying member 162. The second noise reduction member 120 can be unfolded from the reel 130 under the traction of the conveying member 162, and the second noise reduction member 120 and the first noise reduction member 112 at least partially overlap to form a double-layer structure, thereby improving the noise reduction effect of the noise reduction device 10 on high-frequency noise by increasing the thickness of the sound-absorbing structure.

[0068] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "horizontal", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0069] For ease of description, area-relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the regional positional relationship between one or more components or features shown in the figures and other components or features. It should be understood that area-relative terms include not only the orientation of the components as described in the figures, but also different orientations in use or operation. For example, if the components in the drawings are inverted as a whole, the situation where the components are "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Thus, the exemplary term "above" may include both the orientations "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document is intended to include all of these situations.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, parts, components and / or combinations thereof.

[0071] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0072] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A noise reduction device, characterized in that: include: a first noise reduction member, wherein the first noise reduction member is configured in a plate shape; as well as a second noise reduction member, the second noise reduction member being wound on a reel and switchable between a reeled state and an unfolded state; Wherein, when the second noise reduction component is in the expanded state, the second noise reduction component and the first noise reduction component at least partially overlap to form a double-layer structure.

2. The noise reduction device according to claim 1, characterized in that A storage tray is provided on the outer periphery of the reel, and the storage tray has an arc-shaped cavity. When the second noise reduction member is in the reeled state, at least a portion of the second noise reduction member is stored in the arc-shaped cavity.

3. The noise reduction device according to claim 2, characterized in that: The receiving tray includes an arc-shaped body and an extension body. The arc-shaped body encloses the arc-shaped cavity. The extension body extends from both sides of the arc-shaped body toward the outside of the arc-shaped cavity to form an oil scraping edge.

4. The noise reduction device according to claim 3, characterized in that: The second noise reduction component has a first thickness H1 and an unfolded length L1, the arc-shaped body has a first radius R1, the scroll has a second radius R2, and the relationship between the first thickness H1, the unfolded length L1, the first radius R1 and the second radius R2 is: (H1×L1) / 4=π(R12-R22).

5. The noise reduction device according to claim 4, characterized in that: The first thickness H1 is 10 mm to 30 mm.

6. The noise reduction device according to claim 3, characterized in that: The outer side wall of the arc-shaped body outside the arc-shaped cavity is connected with a fixing seat.

7. The noise reduction device according to claim 2, characterized in that: The reel has a first end and a second end, both of the first end and the second end extend out of the arc-shaped cavity, and one of the first end and the second end is connected to a driving member for driving the reel to rotate.

8. The noise reduction device according to claim 1, wherein: The first noise reduction member has a first side and a second side, the reel is located on the first side, a rotating wheel is provided on the second side, and the reel is connected to the rotating wheel through a transmission member; the second noise reduction member has a fixed side and a free side, the fixed side is provided on the reel, and the free side is connected to the transmission member.

9. The noise reduction device according to claim 8, characterized in that: The reel has two connecting sections located at both ends of the second noise reduction member. The connecting sections are provided with grooves. The transmission member passes around the rotating wheel and is connected to the grooves.

10. The noise reduction device according to claim 1, wherein: When the second noise reduction component is in the expanded state, a gap M is provided between the second noise reduction component and the first noise reduction component, and the gap M is no greater than 5 mm.

11. The noise reduction device according to claim 1, characterized in that: The first noise reduction component includes a noise reduction plate and a noise reduction component. The noise reduction plate is enclosed to form an accommodating cavity, and the noise reduction component is installed in the accommodating cavity.

12. The noise reduction device according to claim 11, characterized in that: The noise reduction plate comprises a plate body, the four sides of the plate body are bent to form flanges, the flanges and the plate body are combined to form the accommodating cavity, and the plate body is provided with evenly distributed through holes.

13. The noise reduction device according to claim 12, characterized in that: The through hole has a hole diameter D1, and the hole diameter D1 is 2 mm to 8 mm.

14. The noise reduction device according to claim 12, characterized in that: There is a hole spacing D2 between two adjacent through holes, and the hole spacing D2 is 5mm to 12mm.

15. The noise reduction device according to claim 12, characterized in that: A clamping piece is rotatably connected to the flange, and a clamping groove is provided on the clamping piece.

16. The noise reduction device according to claim 15, characterized in that: The clamping member includes a first body, a second body and a connecting body. The first body is opposite to the second body. The connecting body is connected between the first body and the second body. The first body, the second body and the connecting body enclose the clamping groove.

17. The noise reduction device according to claim 16, characterized in that: A connecting pin is provided on one of the first body and the second body, a connecting hole is provided on the flange, and the connecting pin is inserted into the connecting hole.

18. The noise reduction device according to claim 11, characterized in that The noise reduction component has a second thickness H2, and the second thickness H2 is 5 mm to 10 mm.

19. A range hood, characterized in that: It comprises a casing, a fan and a noise reduction device as described in any one of claims 1 to 18, wherein the casing encloses a accommodating cavity, the fan is installed inside the accommodating cavity, wherein the casing has a mounting backplate, and the first noise reduction component is installed on a side of the mounting backplate facing the accommodating cavity.

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