Noise reduction components and hoods

Abstract

The present application discloses a noise reduction component and a range hood. The noise reduction component includes: a shell, at least two flexible plates and an adjustment mechanism. The shell is formed with a receiving cavity, and a plurality of through holes connected to the receiving cavity are arranged on the shell; each flexible plate is spirally arranged in the receiving cavity, and one end of each flexible plate is connected to the shell, and at least two flexible plates are nested with each other to form a channel connected to the through hole; the adjustment mechanism is arranged in the receiving cavity, and the other end of each flexible plate is connected to the adjustment mechanism, and the adjustment mechanism is used to adjust the length of the channel. The channel length of the noise reduction component of the present application is adjustable, which enables the noise reduction component to adapt to different working conditions and has a better sound absorption effect.

Description

Technical Field

[0001] The present application relates to the field of household appliances, and in particular to a noise reduction component and a range hood. Background Art

[0002] As user demands increase, range hoods need to reduce noise during operation while meeting core indicators such as air volume and static pressure. As the main noise source of range hoods, aerodynamic noise generated by the fan system will be transmitted to the human ear through the air duct and the range hood suction port. Therefore, adding a sound-absorbing structure in the air duct can effectively reduce the overall noise of the range hood.

[0003] In the existing solution, a sound-absorbing resonance cavity is added on the inner wall surface of the air duct. In order to widen the sound absorption frequency band, a porous sound-absorbing material is filled in the cavity to widen the sound absorption frequency band. The existing sound-absorbing resonance cavity has a complex structure and poor sound absorption effect. Summary of the invention

[0004] The present application provides a noise reduction component and a range hood, wherein the noise reduction component has a simple structure and can adjust the noise reduction frequency of the noise reduction component according to different working conditions, so that the noise reduction component has a better sound absorption effect.

[0005] In order to solve the above technical problems, the present application proposes a noise reduction component, which includes: a shell, which is formed with a receiving cavity, and a plurality of through holes connected to the receiving cavity are arranged on the shell; at least two flexible plates, each of which is spirally arranged in the receiving cavity, one end of each flexible plate is connected to the shell, and at least two flexible plates are nested with each other to form a channel connected to the through hole;

[0006] The adjusting mechanism is arranged in the accommodating cavity. The other end of each flexible plate is connected to the adjusting mechanism, and the adjusting mechanism is used to adjust the length of the channel.

[0007] Furthermore, the adjustment mechanism includes: a central axis, which is arranged in the accommodating cavity, the other end of each flexible plate is connected to the central axis, and a driving mechanism, which is connected to the central axis and is used to drive the central axis to rotate to adjust the length of the channel.

[0008] Further, at least two flexible plates form a first channel and a second channel, wherein at least a portion of the through holes are connected to the first channel, and at least a portion of the through holes are connected to the second channel.

[0009] Furthermore, the aperture range of the through hole is 0.6 mm-1 mm, the porosity range of the shell is 2%-10%, and the noise reduction frequency range of the noise reduction component is: 250 Hz-1000 Hz.

[0010] In order to solve the above-mentioned technical problems, the present application further proposes a range hood, which comprises: a box body, which forms a accommodating space and is provided with a smoke extraction port; a fan assembly, which is located in the accommodating space; and a noise reduction assembly according to any one of claims 1 to 4, which is arranged between the fan assembly and the smoke extraction port, and is used to reduce the noise generated by the fan assembly.

[0011] Furthermore, a plurality of through holes in the noise reduction component are arranged toward the fan component.

[0012] Furthermore, the range hood includes a plurality of noise reduction components, and the plurality of noise reduction components are arranged side by side along a first direction, wherein the first direction is parallel to the plane where the air outlet is located.

[0013] Furthermore, the box body is also provided with a smoke outlet, and the range hood also includes a smoke outlet pipe and a monitoring device, the smoke outlet pipe is connected to the smoke outlet, and the monitoring device is arranged on the smoke outlet pipe for detecting the environmental parameters of the noise reduction component.

[0014] Furthermore, the range hood also includes a control device connected to the monitoring device and the adjustment mechanism. The control device obtains environmental parameters from the monitoring device and controls the adjustment mechanism to adjust the length of the channel according to the environmental parameters.

[0015] Furthermore, the monitoring device comprises: a rectifying grid and a static pressure tube, the rectifying grid is located in the smoke outlet pipe, and the static pressure tube is located on a side of the rectifying grid away from the smoke outlet.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the noise reduction component of the present application includes a shell, at least two flexible plates and an adjustment mechanism, wherein the shell is formed with a receiving cavity, and a through hole connected to the receiving cavity is provided on the shell, and the through hole is the entrance of the noise, at least two flexible plates are spirally arranged in the receiving cavity, and at least two flexible plates are nested to form a channel connected to the through hole, that is, the noise can enter the channel through the through hole. The adjustment mechanism is connected to the other end of each of the flexible plates, and is used to adjust the length of the channel to adjust the frequency of sound absorption and noise reduction, so that the noise reduction component can adapt to different working conditions. That is, the noise reduction component of the present application has a simple structure, good sound absorption effect, and can adjust the sound absorption frequency according to different working conditions, so that the noise reduction component has a better sound absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 is a structural schematic diagram of an embodiment of a noise reduction component provided by the present application;

[0019] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of a state of a noise reduction component;

[0020] Figure 3 yes Figure 1 A schematic cross-sectional structure diagram of another state of the noise reduction component;

[0021] Figure 4 yes Figure 1 A schematic cross-sectional structure diagram of another state of the noise reduction component;

[0022] Figure 5 It is a structural schematic diagram of an embodiment of the range hood provided by the present application;

[0023] Figure 6 yes Figure 5 A schematic diagram of the structure of the noise reduction component from another perspective;

[0024] Figure 7 yes Figure 5 Schematic diagram of the structure of the center smoke pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] In the current range hood, the noise is reduced by adding a sound-absorbing resonance cavity on the wall surface in the air duct and using the sound absorption principle of the perforated plate. Since the depth of the cavity is limited by the installation position, the depth of the cavity is generally shallow and can only play a noise reduction role in a narrow band range, so the overall sound absorption effect is greatly reduced. The noise reduction component provided in the present application can effectively reduce the noise generated by the fan, and the depth of the resonance cavity can be adjusted according to the working conditions of the noise reduction component, so that the noise reduction component has a better noise reduction effect. The noise reduction component and the range hood provided by the present invention are described in detail below in conjunction with the embodiments.

[0029] See also Figure 1 and Figure 2 As shown, Figure 1 is a structural schematic diagram of an embodiment of a noise reduction component provided by the present application, Figure 2 yes Figure 1 The cross-sectional structure diagram of the noise reduction component 10 in one state is shown in FIG. 1 , and the noise reduction component 10 includes a shell 11 , at least two flexible plates 12 and an adjustment mechanism 13 .

[0030] The shell 11 is formed with a receiving cavity 112 , and a plurality of through holes 111 communicating with the receiving cavity 112 are formed on the shell 11 . The through holes 111 are used to provide an entrance for noise, that is, external noise enters the receiving cavity 112 through the through holes 111 on the surface of the shell 11 .

[0031] At least two spirally arranged flexible plates 12 are arranged in the accommodating cavity 112, one end of each flexible plate 12 is connected to the shell 11, and the other end of each flexible plate 12 is connected to the adjustment mechanism 13. At least two flexible plates 12 are nested to form a channel connected to the through hole 111, that is, noise enters the channel from the through hole 111 to reduce noise.

[0032] The noise reduction frequency of the noise reduction component 10 is related to the length of the channel, that is, the noise reduction frequency of the noise reduction component 10 can be adjusted by adjusting the length of the channel. In this embodiment, the adjustment mechanism 13 is connected to the other end of the flexible board 12, and is used to adjust the length of the channel to change the noise reduction frequency of the noise reduction component 10.

[0033] The noise reduction component 10 of the present application has a simple structure, and the sound absorption and noise reduction frequency of the noise reduction component 10 can be adjusted through the adjustment mechanism 13, so that the noise reduction component 10 can adapt to different working conditions to achieve the best sound absorption effect.

[0034] Optionally, the shell 11 may be cylindrical, and the cylindrical shell 11 has a high structural strength, can reduce the resistance to sound propagation, and can reduce the volume of the noise reduction component 10. In other embodiments, the shell 11 may also be a rectangular parallelepiped, a cube, or other polygonal prism shapes, etc., which can be selected according to the actual use scenario.

[0035] Each flexible plate 12 is located in the accommodating cavity 112. The flexible plate 12 is made of a flexible material, and one end of the flexible plate 12 is connected to the housing 11. One end of a plurality of flexible plates 12 is connected to the housing 11 at intervals to form different channels to enhance the sound absorption effect. The number of flexible plates 12 can be 2 to simplify the structure of the noise reduction component 10. In other embodiments, the number of flexible plates can also be 3, 4, or 5, etc., which can be selected according to actual conditions.

[0036] In a specific embodiment, Figure 2 As shown, two flexible plates 12 can be selected to be spirally arranged in the accommodating cavity 112, and one end of the two flexible plates 12 is arranged at intervals to form two channels for propagating noise. This arrangement can form a resonance cavity, so that the noise reduction component 10 can achieve a noise reduction effect, and the structure of the resonance cavity is simple, saving production and assembly costs.

[0037] When two flexible plates 12 are provided, the two flexible plates 12 can form a first channel 121 and a second channel 122, wherein at least a portion of the through holes 111 are connected to the first channel 121, so that noise can enter the first channel 121 through the through holes 111, and at least a portion of the through holes 111 are connected to the second channel 122, so that noise can enter the second channel 122 through the through holes 111, and the effect of sound absorption and noise reduction is achieved through the two resonance cavities.

[0038] Optionally, the aperture of the through hole 111 ranges from 0.8 mm to 1.2 mm. For example, the aperture of the through hole 111 may be 1 mm. The porosity of the shell 11 ranges from 2% to 10%, for example, the porosity of the shell 11 may be 7.9%. By reasonably setting the porosity of the shell 11 and the aperture of the through hole 111, the noise reduction effect of the noise reduction component 10 can be improved.

[0039] The adjustment mechanism 13 is connected to the other end of the flexible plate 12 and is used to adjust the length of the channel. The noise reduction frequency of the noise reduction component 10 can be adjusted by adjusting the length of the channel.

[0040] In a specific embodiment, the adjustment mechanism 13 includes a central shaft 131 and a driving mechanism (not shown). The other end of each flexible plate 12 is connected to the central shaft 131, and the driving mechanism is connected to the central shaft 131 and can drive the central shaft 131 to rotate to roll up the other end of the flexible plate 12, thereby changing the length of the channel. The length of the channel can be adjusted according to the length of the flexible plate 12 rolled up by the central shaft 131. The more flexible plates 12 rolled up by the central shaft 131, the shorter the length of the channel, and the fewer flexible plates 12 rolled up by the central shaft 131, the longer the length of the channel. Specifically, the length of the channel can be adjusted according to the working conditions of the noise reduction component 10, so that the noise reduction component 10 can achieve the optimal sound absorption effect.

[0041] The driving mechanism is used to drive the central shaft 131 to move. The present application does not limit the specific driving method of the driving mechanism. In one embodiment, the driving structure can be a rotary driving mechanism. The output end of the rotary driving mechanism is connected to the central shaft 131 to drive the central shaft 131 to rotate, so as to reel or release the flexible board 12. In one embodiment, the rotary driving mechanism can be a servo motor, which is convenient for automatic control of the driving mechanism.

[0042] In another embodiment, the other end of the flexible plate 12 can be set to be foldable, and the driving mechanism can adjust the length of the channel by continuously opening the folded part. The flexible plate 12 is set to be a flexible material, and the length of the channel can be adjusted by deforming the other end of the flexible plate 12. This adjustment method can also conveniently adjust the length of the channel.

[0043] In other embodiments, the flexible plate 12 may be rolled up in other ways as long as the length of the adjustment channel can be adjusted.

[0044] The noise reduction frequency range of the noise reduction component 10 can be: 250Hz-1000Hz. Figure 2-Figure 4 As shown, Figure 3 yes Figure 1 A schematic cross-sectional structure diagram of another state of the noise reduction component 10, Figure 4 yes Figure 1 The cross-sectional structure diagram of the noise reduction component 10 in another state. The adjustment mechanism 13 can adjust the length of the channel, and the adjustment mechanism 13 can release the flexible plate 12 completely, such as Figure 2 As shown, the length range of the channel is: 100-130mm. In this state, the noise reduction frequency range of the noise reduction component 10 is 250-500Hz; the adjustment mechanism 13 can roll up the flexible plate 12 and make the flexible plate 12 in Figure 3 In the state shown, the length of the channel ranges from 70 to 100 mm. In this state, the noise reduction frequency of the noise reduction component 10 is between 350 Hz and 800 Hz. When the adjustment mechanism 13 shrinks the flexible plate 12 to the maximum extent, as shown in FIG. Figure 5 As shown, the length of the channel is in the range of 50-70 mm. In this state, the noise reduction frequency of the noise reduction component 10 is in the range of 500 Hz-1000 Hz. That is, the noise reduction frequency of the noise reduction component 10 can be adjusted by adjusting the length of the channel, so that the noise reduction component 10 can adapt to different working conditions, and the degree of intelligence is relatively high.

[0045] When the noise reduction component 10 is used for noise reduction, the noise reduction component 10 is arranged on one side of the noise source, and the through hole 111 of the noise reduction component 10 is arranged toward the side of the noise source, so that the noise source can smoothly enter the channel through the through hole 111 to achieve the effect of noise reduction. The adjustment mechanism 13 can adjust the length of the channel, thereby adjusting the noise reduction frequency of the noise reduction component 10, so that the noise reduction component 10 can achieve a better noise reduction effect.

[0046] For example, in a specific usage scenario, when the noise reduction component 10 is used to reduce the noise generated by the fan component of the range hood, when the wind pressure in the air supply environment of the fan component (such as the public flue of the range hood) is high, the adjustment mechanism 13 adjusts the length of the channel to make the channel length shorter, so as to increase the noise reduction frequency of the noise reduction component 10, so that the noise reduction component 10 can reduce the noise generated by the fan component under this working condition to a greater extent.

[0047] When the wind pressure in the air supply environment of the fan assembly is low, the adjustment mechanism 13 can adjust the length of the channel to make the length of the channel longer to reduce the noise reduction frequency of the noise reduction assembly 10, so that the noise reduction assembly 10 can better adapt to this working condition and achieve a better noise reduction effect.

[0048] The channel length of the noise reduction component 10 in the above embodiment is adjustable, so that the noise reduction component 10 can adapt to different working conditions to achieve the best sound absorption effect.

[0049] The present application also provides a range hood, which includes a noise reduction component 10 of any of the above embodiments. The noise reduction component 10 is used in the range hood to reduce the noise generated by the fan component in the range hood, improve the performance of the range hood, and make the range hood better meet the needs of users. Figure 5 As shown, Figure 5 It is a structural schematic diagram of an embodiment of the range hood provided in the present application.

[0050] like Figure 5 As shown, the range hood 20 includes: a housing 21 , a fan assembly 22 and a noise reduction assembly 10 .

[0051] Specifically, the box body 21 is formed with a accommodating space, and the fan assembly 22 is placed in the accommodating space (not marked in the figure), and the box body 21 is provided with a smoke intake port 211 and a smoke outlet (not marked in the figure) connected to the accommodating space, and the fan assembly 22 is used to draw oil smoke from the smoke intake port 211 to the smoke outlet.

[0052] During the operation of the fan assembly 22, the aerodynamic noise generated by the fan assembly 22 will be transmitted to the human ear through the smoke outlet 211, which does not meet the user's usage requirements. In this embodiment, the noise reduction component 10 is arranged between the fan assembly 22 and the smoke outlet 211 to reduce the noise generated by the fan assembly 22, reduce the noise received by the human ear, improve the performance of the range hood 20, and meet the user's usage requirements.

[0053] Furthermore, the through hole 111 on the noise reduction component 10 can be arranged toward the fan component 22, so that the noise generated by the fan component 22 can smoothly enter the channel of the noise reduction component 10 for noise reduction. This arrangement can also make the through hole 111 on the noise reduction component 10 facing away from the smoke outlet 211, thereby reducing the oil smoke entering the noise reduction component 10 and preventing the oil smoke from clogging the through hole 111, thereby affecting the noise reduction effect of the noise reduction component 10.

[0054] like Figure 5 and Figure 6 As shown, Figure 6 yes Figure 5 A structural schematic diagram of the noise reduction component from another perspective, in order to improve the noise reduction effect of the range hood 20, a plurality of noise reduction components 10 may be provided in the range hood 20, and the plurality of noise reduction components 10 may be provided close to the fan component 22 to absorb the noise of the fan component 22. In a specific embodiment, the plurality of noise reduction components 10 may be provided along a first direction X, wherein the first direction X may be parallel to the plane where the air outlet 211 is located, so that the plurality of noise reduction components 10 can have a good sound absorption effect on noises at different incident angles.

[0055] The plurality of noise reduction components 10 are located on the oil smoke passage, and the area of ​​the oil smoke passage opening may range from 50% to 75%. The plurality of noise reduction components 10 may be arranged densely in the middle of the oil smoke passage opening, and sparsely on both sides, so that most of the oil smoke enters from both sides of the plurality of noise reduction components 10, so as to reduce the influence of the oil smoke on the noise reduction components 10.

[0056] In other embodiments, the noise reduction component 10 may also be disposed around the fan component 22 to absorb the noise generated by the fan component 22 from multiple directions to improve the effect of the range hood 20 .

[0057] In some embodiments, see Figure 7 As shown, the range hood 20 may further include a monitoring device 40 and a control device 30 , and the adjustment mechanism 13 of the noise reduction component 10 may be automatically adjusted by the control device 30 .

[0058] Specifically, the monitoring device 40 is used to monitor the environmental parameters of the noise reduction component 10, and the control device 30 connects the monitoring device 40 and the adjustment mechanism 13 to control the action of the adjustment mechanism 13 according to the obtained environmental parameters, and automatically adjusts the length of the channel according to different working conditions, so that the noise reduction component 10 can achieve a better noise reduction effect, improve the performance of the range hood 20, and meet the user's usage needs.

[0059] like Figure 5 As shown, the range hood 20 may further include a smoke outlet pipe 24 . The monitoring device 40 may be located on the smoke outlet pipe 24 to detect environmental parameters of the noise reduction assembly 10 . The control device 30 may also be disposed on the smoke outlet pipe 24 .

[0060] Different environmental parameters can reflect different working states of the fan assembly 22 . In one embodiment, the environmental parameter may be a static pressure parameter at an air outlet of the fan assembly 22 .

[0061] In a specific embodiment, in order to obtain the static pressure parameters at the air outlet of the fan assembly 22, the monitoring device 40 includes a static pressure measuring device disposed at the air outlet of the fan assembly 22 to measure the static pressure parameters at the air outlet of the fan. The static pressure measuring device can be measured by a micro differential pressure gauge. In one embodiment, refer to Figure 7 The static pressure measuring device includes a static pressure tube 41, and a static pressure hole (not shown) is provided on the static pressure tube 41. In this way, the static pressure in the static pressure tube 41 can be easily obtained, and then the static pressure parameters of the air outlet of the fan assembly 22 can be obtained.

[0062] The airflow speed at the air outlet of the fan assembly 22 is uneven, and the static pressure of the airflow measured by the static pressure tube 41 cannot well reflect the gas flow state of the entire air outlet. In one embodiment, a rectifying grid 42 is provided in the smoke outlet pipe 24, and the rectifying grid 42 is used to divide the inner cavity of the smoke outlet pipe 24 into a plurality of parallel pipe flow channels. The static pressure tube 41 is located on the side of the rectifying grid 42 away from the smoke outlet, and is arranged corresponding to one of the pipe flow channels. Through the rectifying effect of the rectifying grid 42, the airflow is evenly distributed in each pipe flow channel. Therefore, the gas of the local airflow measured by the static pressure tube 41 can reflect the overall gas flow rate of the air outlet, which has a better effect.

[0063] In one embodiment, the rectifying grid 42 includes a plurality of grid plates arranged in a staggered manner. The staggered grid plates can conveniently divide the entire pipeline of the smoke outlet pipe 24 into a plurality of pipe flow channels.

[0064] In some embodiments, the environmental parameters may also include at least one of the flow velocity parameters at the air outlet of the fan assembly 22, the motor power parameters, and the wind wheel speed parameters. It should be noted that the control device 30 controls the operation of the adjustment mechanism 13 according to the obtained environmental parameters, and the environmental parameters may be one of the above parameters, or a combination of any two, three, etc., so as to provide comprehensive feedback on the working state of the fan assembly 22. The flow velocity parameters at the air outlet of the fan assembly 22 can be obtained by measuring the total pressure and static pressure through the wind speed tube and through the corresponding relationship. The motor power parameters can be obtained by obtaining the bus current on the driving motor of the wind wheel through the current sensor. The wind wheel speed parameters can be measured by a speed measurement device, etc.

[0065] The control device 30 of the range hood 20 is connected to the monitoring device 40 and the adjustment mechanism 13, and the method of controlling the adjustment mechanism 13 through the control device 30 includes: S10: the control device 30 obtains the actual environmental parameters of the noise reduction component 10; S12: the control device 30 obtains the actual adjustment parameters based on the obtained actual environmental parameters and the first mapping relationship, wherein the first mapping relationship is the corresponding association relationship between the environmental parameters and the adjustment parameters; S13: based on the obtained actual adjustment parameters, the adjustment mechanism 13 is controlled to move so as to adjust the length of the channel.

[0066] Furthermore, in step S10 , the control device 30 can obtain the air outlet flow velocity parameters of the fan assembly 22 , the air outlet static pressure parameters of the fan assembly 22 , the motor power parameters, the wind wheel speed parameters, etc., mainly through detection by the monitoring device 40 .

[0067] In step S20, the first mapping relationship is the corresponding association relationship between the working parameters and the adjustment parameters, which needs to be written into the control program of the control device 30. For a specific model, there is a specific corresponding relationship, which can be set according to actual conditions.

[0068] In step S30, the adjustment mechanism 13 is controlled to move according to the actual adjustment parameters obtained. It should be noted that after the actual adjustment parameters are obtained, the adjustment mechanism 13 can be directly driven to move. For example, the adjustment mechanism 13 adjusts the length of the channel according to different working conditions. For example, when the wind pressure in the smoke outlet pipe 24 is high, the control device 30 controls the adjustment mechanism 13 to make the length of the channel shorter to increase the noise reduction frequency of the noise reduction component 10 and improve the noise reduction effect of the noise reduction component 10. When the wind pressure in the smoke outlet pipe 24 is low, the control device 30 can control the adjustment mechanism 13 to make the length of the channel longer to reduce the noise reduction frequency of the noise reduction component 10.

[0069] In the above embodiment, the control device 30 obtains the actual environmental parameters of the noise reduction component 10, and obtains the actual adjustment parameters based on the obtained actual environmental parameters and the first mapping relationship, and controls the activity of the adjustment mechanism 13 based on the obtained actual adjustment parameters, thereby automatically driving the adjustment mechanism 13 to adjust the channel length according to the actual environmental parameters of the noise reduction component 10, so that the noise reduction component 10 can adapt to different working conditions.

[0070] In a specific embodiment, when the environmental parameter is the static pressure parameter of the air outlet of the fan assembly 22, for a specific model, an air performance test is conducted in a laboratory, the channel length and the static pressure value corresponding to the channel length are measured, and the values ​​are written into the control device 30 after calibration, so that the control device 30 performs control according to the calibrated value. The control example (static pressure Ps, unit Pa) of a specific model of the range hood 20 is as follows:

[0071] When Ps∈[0,150), the static pressure parameter of the air outlet of the fan assembly 22 meets the first preset condition. At this time, the control device 30 controls the adjustment mechanism 13 to move so that the channel length is the first preset value. The state of the noise reduction assembly 10 is as follows: Figure 2 As shown, at this time, the adjustment mechanism 13 completely releases the flexible plate 12, so that the channel has a maximum length, thereby reducing the noise reduction frequency of the noise reduction component 10 and making the noise reduction frequency within the range of 250 MHz-500 Hz.

[0072] When P s ∈[150,300), the static pressure parameter of the air outlet of the fan assembly 22 meets the second preset condition. At this time, the control device 30 controls the adjustment mechanism 13 to move to adjust the length of the channel to the second preset value, that is, the adjustment mechanism 13 retracts the flexible plate 12 to reduce the length of the channel so that the length of the channel is the second preset value. The state of the noise reduction assembly 10 is as follows Figure 3 As shown, in this state, the noise reduction frequency of the noise reduction component 10 is 350MHz-800Hz.

[0073] When Ps∈[300,430), the static pressure parameter of the air outlet of the fan assembly 22 meets the third preset condition. At this time, the control device 30 controls the adjustment mechanism 13 to move so that the channel length is the third preset value. The state of the noise reduction assembly 10 is as follows: Figure 4 As shown, at this time, the adjustment mechanism 13 contracts the flexible plate 12 to the maximum extent, so that the channel has a minimum length, thereby increasing the noise reduction frequency of the noise reduction component 10 and making the noise reduction frequency of the noise reduction component 10 within the range of 500 Hz-1000 Hz.

[0074] In the range hood of the above embodiment, the monitoring device 40 detects the actual environmental parameters of the noise reduction component 10, and then the control device 30 obtains the adjustment parameters of the adjustment mechanism 13 according to the environmental parameters of the noise reduction component 10. The control device 30 then controls the adjustment mechanism 13 according to the adjustment parameters to adjust the length of the channel so that the channel length meets the current working conditions, so that the noise reduction component 10 has a better noise reduction effect. The range hood 20 of this embodiment has a simple structure and low noise, which can meet the user's usage needs.

[0075] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A noise reduction component, It is characterized in that The noise reduction component comprises: A housing is formed with a receiving cavity, and the housing is provided with a plurality of through holes communicating with the receiving cavity; At least two flexible plates, each of which is spirally disposed in the accommodating cavity, one end of each of which is connected to the housing, and at least two of the flexible plates are nested with each other to form a channel communicating with the through hole; An adjustment mechanism is arranged in the accommodating cavity, and the other end of each of the flexible plates is connected to the adjustment mechanism, and the adjustment mechanism is used to adjust the length of the channel. The adjustment mechanism includes: a central shaft, which is arranged in the accommodating cavity, and the other end of each flexible plate is connected to the central shaft; and a driving mechanism, which is connected to the central shaft and is used to drive the central shaft to rotate so as to adjust the length of the channel.

2. The noise reduction assembly according to claim 1, It is characterized in that At least two of the flexible plates form a first channel and a second channel, wherein at least a portion of a plurality of the through holes are connected to the first channel, and at least a portion of a plurality of the through holes are connected to the second channel.

3. The noise reduction assembly according to claim 1, It is characterized in that The aperture range of the through hole is 0.6 mm-1 mm, the porosity range of the shell is 2%-10%, and the noise reduction frequency range of the noise reduction component is: 250 Hz-1000 Hz.

4. A range hood, It is characterized in that The smoke machine comprises: A box body is formed with a containing space, and the box body is provided with a smoking port; A fan assembly is located in the accommodating space; The noise reduction component according to any one of claims 1 to 3 is arranged between the fan component and the smoke extraction port, and is used to reduce the noise generated by the fan component.

5. The range hood according to claim 4, It is characterized in that Several through holes in the noise reduction component are arranged toward the fan component.

6. The range hood according to claim 5, It is characterized in that The range hood comprises a plurality of noise reduction components, and the plurality of noise reduction components are arranged side by side along a first direction, wherein the first direction is parallel to the plane where the smoking port is located.

7. The range hood according to claim 5, It is characterized in that The box body is also provided with a smoke outlet, and the range hood further comprises a smoke outlet pipe and a monitoring device, the smoke outlet pipe is connected to the smoke outlet, and the monitoring device is arranged on the smoke outlet pipe for detecting the environmental parameters of the noise reduction component.

8. The range hood according to claim 7, It is characterized in that The range hood further comprises a control device connected to the monitoring device and the adjustment mechanism, wherein the control device obtains the environmental parameters from the monitoring device and controls the adjustment mechanism to adjust the length of the passage according to the environmental parameters.

9. The range hood according to claim 7, It is characterized in that The monitoring device comprises: A rectifying grid and a static pressure pipe, wherein the rectifying grid is located in the smoke outlet pipe, and the static pressure pipe is located at a side of the rectifying grid away from the smoke outlet.

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