A noise reduction structure for a fan and a range hood

Abstract

The present invention discloses a noise reduction structure for a blower and a range hood. The blower has a volute, and includes a flow guiding device, a noise reduction device, a driving device and a control device. One end of the flow guiding device is arranged on the volute tongue of the volute to collect the noise at the volute tongue position, and the other end extends along the circumferential direction of the volute. The flow guiding device is movably connected to the noise reduction device to jointly define a noise reduction channel. The driving device is arranged outside the volute, and the noise reduction device is slidably arranged on the volute through the driving device. The driving device is electrically connected to the control device, and the driving device drives the noise reduction device to move relative to the flow guiding device to achieve standing wave noise elimination at different frequencies. The structure is simple, which can significantly reduce the noise interference of the blower, thereby further improving the noise reduction effect of the blower.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular, to a noise reduction structure for a fan and a range hood. Background Art

[0002] In recent years, the range hood market has been mainly promoting the concepts of large air volume and large suction. With the improvement of people's requirements for the quality of life, when users choose a range hood, they are increasingly concerned about the size of the noise parameter of the range hood. It can be said that the quality of the noise performance of the range hood is a key factor in product competitiveness.

[0003] In recent years, the domestic range hood market has been mainly promoting the concepts of large air volume and large suction. With the gradual increase in the air volume, the noise generated by the range hood is also getting louder. In related technologies, most of the time, when the range hood is turned on during cooking, one cannot hear voices, phone calls, doorbells, or the voices of children. Moreover, this strong noise can cause adverse reactions such as irritability, headache, and palpitation in housewives and kitchen operators. Long-term use will have a serious impact on physical and mental health. Therefore, noise has become an urgent technical problem existing in the existing range hoods. Summary of the Invention

[0004] The present invention aims to solve at least one of the problems existing in the related art to some extent. For this purpose, the present invention provides a noise reduction structure for a fan, which has a simple structure and can significantly reduce the noise interference of the fan, thereby further improving the noise reduction effect of the fan.

[0005] In addition, the present invention also provides a range hood, which is reasonably designed and can effectively reduce the noise generated during the operation of the range hood.

[0006] The above first object is achieved by the following technical solution:

[0007] A noise reduction structure for a fan, the fan having a volute, comprising a drainage device, a noise reduction device, a driving device, and a control device, wherein one end of the drainage device is disposed on the volute tongue of the volute for collecting the noise at the volute tongue position, the other end extends along the circumferential direction of the volute, and the drainage device is movably connected to the noise reduction device to jointly define a noise reduction channel. The driving device is disposed outside the volute, the noise reduction device is slidably disposed on the volute through the driving device, the driving device is electrically connected to the control device, and the driving device drives the noise reduction device to move relative to the drainage device to achieve standing wave noise cancellation at different frequencies.

[0008] In some embodiments, the drainage device includes a drainage channel and a plurality of branch channels, wherein the plurality of branch channels are provided on the volute tongue of the volute, one end of the drainage channel is communicated with the volute tongue of the volute through the plurality of branch channels, and the other end is movably connected to the noise reduction device.

[0009] In some embodiments, the noise reduction device includes an adjustment channel and a noise reduction component, wherein the adjustment channel is slidably provided on the volute, one end of the adjustment channel is movably connected to the drainage device, the other end is provided with the noise reduction component, and the drive motor drives the adjustment channel to move relative to the drainage device to adjust the length of the noise reduction channel.

[0010] In some embodiments, a plurality of through holes are formed at one end of the adjustment channel close to the noise reduction component, and the noise reduction component covers the through holes to absorb and reduce the noise inside the adjustment channel.

[0011] In some embodiments, the noise reduction component includes a first noise reduction layer, a second noise reduction layer and a third noise reduction layer, wherein the first noise reduction layer, the second noise reduction layer and the third noise reduction layer are sequentially arranged in the direction from the inside to the outside of the adjustment channel.

[0012] In some embodiments, the thickness of the first noise reduction layer is 10μm - 100μm, the thickness of the second noise reduction layer is 100μm - 500μm, and the thickness of the third noise reduction layer is 500μm - 2000μm.

[0013] In some embodiments, the drive device includes a drive motor electrically connected to the control device, the drive motor is provided on the volute, and the output end of the drive motor is connected to the noise reduction device.

[0014] In some embodiments, the drive device further includes a mounting bracket, the mounting bracket is mounted on the volute, and the drive motor is provided on the volute through the mounting bracket.

[0015] In some embodiments, a limiting portion extends outward at one end of the mounting bracket away from the volute, and the limiting portion abuts against the noise reduction device to limit the movement of the noise reduction device.

[0016] The above second object is achieved by the following technical solutions:

[0017] An oil fume extractor includes a fan, and the noise reduction structure described in any of the above embodiments is provided on the fan.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. The noise reduction structure of the fan of the present invention has a simple structure and can significantly reduce the noise interference of the fan, thereby further improving the noise reduction effect of the fan.

[0020] 2. Its design is reasonable and can absorb noises in different frequency bands generated by the operation of the fan.

[0021] 3. The range hood of the present invention has a reasonable design and can effectively reduce the noise generated by the operation of the range hood. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the noise reduction structure of the fan in the embodiment of the present invention;

[0023] Figure 2 is a sectional view of the noise reduction structure of the fan in the embodiment of the present invention;

[0024] Figure 3 is Figure 2 a partial enlarged schematic view of part A in Detailed Embodiments

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of the technical solutions claimed by the present invention.

[0026] Embodiment 1:

[0027] As Figures 1 to 3 shown, this embodiment provides a noise reduction structure of a fan. The fan 1 has a volute 11, and includes a diversion device 2, a noise reduction device 3, a driving device 4 and a control device. One end of the diversion device 2 is arranged on the volute tongue 12 of the volute 11 to collect the noise at the position of the volute tongue 12, and the other end extends along the circumferential direction of the volute 11. The diversion device 2 is movably connected to the noise reduction device 3 to jointly define a noise reduction channel. The driving device 4 is arranged outside the volute 11, and the noise reduction device 3 is slidably arranged on the volute 11 through the driving device 4. The driving device 4 is electrically connected to the control device, and the driving device 4 drives the noise reduction device 3 to move relative to the diversion device 2 to achieve standing wave noise elimination of different frequencies.

[0028] In this embodiment, since the impeller of the fan 1 rotates to cause the airflow to impact the volute tongue 12, thereby generating the impact noise of the volute tongue 12 and the rotation noise of the impeller, the volute tongue 12 of the volute 11 is the position of the maximum noise source of the fan 1. It is necessary to eliminate the noise at this position. A diversion device 2 is arranged at the position of the volute tongue 12 of the volute 11 to guide the impact airflow so that it flows into the diversion device 2, thereby reducing the impact of the airflow on the volute tongue 12. The noise that enters the diversion device 2 continues to be transmitted in the direction of the noise reduction device 3, so that the noise reduction device 3 reduces and eliminates the noise. The noise reduction device 3 is driven by the driving device 4 to move relative to the diversion device 2 to adjust the length of the noise reduction channel, thereby realizing the elimination of standing waves of different frequencies. Its structure is simple, and it can significantly reduce the noise interference of the fan 1, thereby further improving the noise reduction effect of the fan 1.

[0029] Furthermore, the diversion device 2 includes a diversion channel 21 and a plurality of branch channels 22. Among them, the plurality of branch channels 22 are arranged on the volute tongue 12 of the volute 11. One end of the diversion channel 21 is connected to the volute tongue 12 of the volute 11 through the plurality of branch channels 22, and the other end is movably connected to the noise reduction device 3. Its structure is simple and the design is reasonable, which can effectively improve the diversion effect of the noise at the position of the volute tongue 12.

[0030] In this embodiment, the plurality of branch channels 22 are arranged at one end of the diversion channel 21 close to the volute tongue 12. The diversion channel 21 is connected to the volute tongue 12 of the volute 11 through the plurality of branch channels 22, so that the air in the volute 11 is led out from the position of the volute tongue 12 into the plurality of branch channels 22. The air in the plurality of branch channels 22 converges on the diversion channel 21, and then flows into the noise reduction device 3 through the diversion channel 21 so that the noise reduction device 3 realizes the noise reduction and elimination.

[0031] Furthermore, the noise reduction device 3 includes an adjustment channel 6 and a noise reduction component 5. Among them, the adjustment channel 6 is slidably arranged on the volute 11 through the driving motor 41. One end of the adjustment channel 6 is movably connected to the diversion device 2, and the other end is provided with the noise reduction component 5. The driving motor 41 drives the adjustment channel 6 to move relative to the diversion device 2 to adjust the length of the noise reduction channel. Its structure is simple, and by adjusting the length of the noise reduction channel, the adjustment of the sound absorption frequency can be realized.

[0032] Preferably, a plurality of through holes 61 are opened at one end of the adjustment channel 6 close to the noise reduction component 5, and the noise reduction component 5 covers the through holes 61 to absorb and reduce the noise in the adjustment channel 6. Its structure is simple and compact, which is conducive to the noise reduction component 5 to reduce and eliminate the noise in the adjustment channel 6.

[0033] Specifically, the noise reduction component 5 includes a first noise reduction layer 51, a second noise reduction layer 52, and a third noise reduction layer 53. The first noise reduction layer 51, the second noise reduction layer 52, and the third noise reduction layer 53 are sequentially arranged in the direction from the inside to the outside of the adjustment channel 6. Its design is reasonable and can further improve the noise reduction effect of the noise reduction device 3.

[0034] Preferably, the thickness of the first noise reduction layer 51 is 10 μm - 100 μm, the thickness of the second noise reduction layer 52 is 100 μm - 500 μm, and the thickness of the third noise reduction layer 53 is 500 μm - 2000 μm. Its design is reasonable and ingenious, and can effectively absorb noises of different frequency bands generated by the operation of the fan 1.

[0035] In this embodiment, the adjustment channel 6 is slidably arranged on the volute 11 through the driving motor 41. One end of the adjustment channel 6 is sleeved outside the drainage channel 21 of the drainage device 2, so that the adjustment channel 6 can move telescopically outside the drainage channel 21 of the drainage device 2, so that the adjustment channel 6 is movably connected to the drainage channel 21 of the drainage device 2. In this way, the noise reduction channel is jointly defined by the adjustment channel 6 and the adjustment channel 6. By driving the adjustment channel 6 to move telescopically, the length of the noise reduction channel can be adjusted, and then the absorbable frequency can be adjusted. The longer the length of the noise reduction channel, the lower the absorbable frequency band. Then, the shorter the length of the noise reduction channel, the higher the absorbable frequency band. In addition, since the constructed noise reduction channel is a sealed structure, only sound is transmitted in the noise reduction channel and there is no fluid flow, so there will be no loss of gas kinetic energy. The other end of the adjustment channel 6 extends along the circumferential direction of the volute 11, and the noise reduction component 5 is arranged at one end of the adjustment channel 6 far from the drainage device 2. The noise in the volute 11 is introduced into the drainage device 2 from the volute tongue 12 of the volute 11 through the drainage device 2. The noise entering the drainage device 2 continues to be transmitted in the direction of the noise reduction device 3, so that the noise reduction device 3 reduces and eliminates the noise. The driving device 4 drives the noise reduction device 3 to move relative to the drainage device 2 to adjust the length of the noise reduction channel, so as to realize the elimination of standing waves of different frequencies. In this embodiment, in order to further ensure the noise reduction effect of the fan 1, the length of the noise reduction channel is one-fourth of the maximum noise wavelength, so that the sound reflected back after the noise enters the noise reduction channel exactly generates a standing wave effect with the noise, so as to realize resonance noise reduction.

[0036] In this embodiment, the outer wall of the adjustment channel 6 is provided with a first noise reduction layer 51, a second noise reduction layer 52 and a third noise reduction layer 53 in sequence, and the first noise reduction layer 51, the second noise reduction layer 52 and the third noise reduction layer 53 are arranged in sequence from the inside to the outside along the adjustment channel 6, so that the first noise reduction layer 51 covers the through hole 61 opened on the adjustment channel 6. Due to the different thicknesses of the three noise reduction layers, the damping and silencing effect of the noise reduction layer materials has different functional effects. In this embodiment, the number of layers of the noise reduction layer of the noise reduction component 5 is not limited to The first noise reduction layer 51, the second noise reduction layer 52 and the third noise reduction layer 53 are all made of flexible materials, which can be made of flame-retardant film, flame-retardant paper, artificial leather, etc. Of course, other more suitable materials can be selected according to actual needs, and the flexible material layer is preferably made of ultra-thin flexible material, and its thickness range is preferably 10μm-2000μm. In addition, since the sound absorption coefficient is relatively low at high frequencies, the resonance The frequency is usually between 150 and 800 Hz, and the maximum sound absorption coefficient is 0.3 to 0.4. In order to further improve the noise reduction effect, the thickness of the first noise reduction layer 51 is preferably 10 μm-100 μm. The first noise reduction layer 51 is provided at the position of the through hole 61 of the noise reduction channel to mainly play the role of damping and sound absorption. It resonates with the noise in the frequency band of 500 Hz-700 Hz, thereby absorbing the noise of 500 Hz-700 Hz. The thickness of the second noise reduction layer 52 is preferably 100 μm-500 μm. The second noise reduction layer 52 is arranged outside the first noise reduction layer 51, which mainly plays the role of damping and sound absorption. It resonates with the noise in the frequency band of 300Hz-500Hz, thereby absorbing the noise in the frequency band of 300Hz-500Hz; the thickness of the third noise reduction layer 53 is preferably 500μm-2000μm. The third noise reduction layer 53 is arranged outside the second noise reduction layer 52, which mainly plays the role of damping and sound absorption. It resonates with the noise in the frequency band of 150Hz-300Hz, thereby absorbing the noise in the frequency band of 150Hz-300Hz. The flexible material used in the noise reduction layer in this embodiment should have a certain prestress when it is installed and fixed to achieve a better noise reduction effect. The flexible material is mainly the internal damping loss when the film vibrates as a whole, so it can be regarded as a simple mass-spring system.

[0037] In this embodiment, the telescopic length of the adjustment channel 6 can be linked controlled according to the back pressure of the fan 1. If the back pressure of the fan 1 is higher and the rotation speed of the fan 1 is faster so that the high-frequency part noise is more, the length of the noise reduction channel will be shorter, and vice versa.

[0038] Furthermore, the driving device 4 includes a driving motor 41 electrically connected to the control device. The driving motor 41 is disposed on the volute 11, and the output end of the driving motor 41 is connected to the noise reduction device 3. Its structure is simple, which is conducive to driving the noise reduction device 3 to perform telescopic movement relative to the drainage device 2.

[0039] Specifically, the driving device 4 further includes a mounting bracket 42. The mounting bracket 42 is mounted on the volute 11, and the driving motor 41 is disposed on the volute 11 through the mounting bracket 42, which is conducive to the disassembly and assembly of the driving motor 41.

[0040] Particularly, a limiting portion 43 is extended outward at one end of the mounting bracket 42 away from the volute 11. The limiting portion 43 abuts against the noise reduction device 3 to limit the movement of the noise reduction device 3. Its design is reasonable and ingenious, which can effectively limit the movement of the noise reduction channel.

[0041] In this embodiment, a mounting bracket 42 is provided on the volute 11. The driving motor 41 is mounted on the mounting bracket 42 and is located at the middle position between the volute 11 and the adjustment channel 6. A gear is provided on the rotating shaft of the driving motor 41, and a rack is provided on the outer wall of the adjustment channel 6. The gear meshes with the rack so that the driving motor 41 drives the adjustment channel 6 to perform telescopic movement corresponding to the drainage. A limiting portion 43 is extended outward at one end of the mounting bracket 42 away from the volute 11. The movement of the noise reduction device 3 is limited by the combined action of the driving motor 41 and the limiting portion 43. In this embodiment, the driving motor 41 is preferably a stepping motor, but is not limited to a stepping motor, and other more suitable motors can also be selected according to actual needs.

[0042] Embodiment Two:

[0043] As Figures 1 to 3 shown, this embodiment provides a range hood, including a blower 1, and the noise reduction structure as described in Embodiment One is provided on the blower 1.

[0044] In this embodiment, the range hood is provided with a drainage device 2 at the position of the volute tongue 12 of the volute 11 to guide the impact airflow and make it flow into the drainage device 2, thereby reducing the impact of the airflow on the position of the volute tongue 12, and the noise entering the drainage device 2 continues to be transmitted in the direction of the noise reduction device 3, so that the noise reduction device 3 reduces and silences the noise, and the noise reduction device 3 is driven by the driving device 4 to move relative to the drainage device 2 to adjust the length of the noise reduction channel, thereby achieving standing wave silencer of different frequencies, and the telescopic length of the adjustment channel 6 can be linked controlled according to the back pressure of the fan 1 to further improve the noise reduction effect. In addition, if the speed of the range hood is low, the overall noise of the range hood is relatively low, and the user can exit the noise reduction function through the operation function on the control panel. After exiting the noise reduction function, the range hood can still work normally. Its design is reasonable and can effectively reduce the noise generated by the operation of the range hood.

[0045] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A noise reduction structure for a fan, the fan (1) having a volute (11), characterized in that, It includes a drainage device (2), a noise reduction device (3), a driving device (4) and a control device. One end of the drainage device (2) is arranged on the volute tongue (12) of the volute (11) for collecting the noise at the position of the volute tongue (12), and the other end extends along the circumferential direction of the volute (11). The drainage device (2) is movably connected to the noise reduction device (3) to jointly define a noise reduction channel. The driving device (4) is arranged outside the volute (11). The noise reduction device (3) is slidably arranged on the volute (11) through the driving device (4). The driving device (4) is electrically connected to the control device. The driving device (4) drives the noise reduction device (3) to move relative to the drainage device (2) to achieve standing wave noise elimination at different frequencies; The noise reduction device (3) includes an adjustment channel (6) and a noise reduction component (5). The adjustment channel (6) is slidably arranged on the volute (11) through the driving device (4). One end of the adjustment channel (6) is movably connected to the drainage device (2), and the other end is provided with the noise reduction component (5). The driving device (4) drives the adjustment channel (6) to move relative to the drainage device (2) to adjust the length of the noise reduction channel; The drainage device (2) includes a drainage channel (21). The drainage channel (21) is movably connected to the adjustment channel (6) to jointly define the noise reduction channel.

2. The noise reduction structure of a fan according to claim 1, wherein, The drainage device (2) includes a plurality of branch channels (22). The plurality of branch channels (22) are arranged on the volute tongue (12) of the volute (11). One end of the drainage channel (21) is connected to the volute tongue (12) of the volute (11) through the plurality of branch channels (22), and the other end is movably connected to the noise reduction device (3).

3. The noise reduction structure of a fan according to claim 1, characterized in that, A number of through holes (61) are opened at one end of the adjustment channel (6) close to the noise reduction component (5). The noise reduction component (5) covers the through holes (61) to absorb and reduce the noise in the adjustment channel (6).

4. A noise reduction structure for a fan according to claim 1, characterized in that, The noise reduction component (5) includes a first noise reduction layer (51), a second noise reduction layer (52) and a third noise reduction layer (53). The first noise reduction layer (51), the second noise reduction layer (52) and the third noise reduction layer (53) are sequentially arranged in the direction from the inside to the outside of the adjustment channel (6).

5. The noise reduction structure of a fan according to claim 4, characterized in that, The thickness of the first noise reduction layer (51) is 10μm - 100μm, the thickness of the second noise reduction layer (52) is 100μm - 500μm, and the thickness of the third noise reduction layer (53) is 500μm - 2000μm.

6. A noise reduction structure for a fan according to any one of claims 1 to 5, characterized in that, The driving device (4) includes a driving motor (41) electrically connected to the control device. The driving motor (41) is arranged on the volute (11). The output end of the driving motor (41) is connected to the noise reduction device (3).

7. The noise reduction structure of a fan according to claim 6, characterized in that, The drive device (4) further includes a mounting bracket (42), the mounting bracket (42) is mounted on the volute (11), and the drive motor (41) is arranged on the volute (11) through the mounting bracket (42).

8. The noise reduction structure of a fan according to claim 7, characterized in that, One end of the mounting bracket (42) far from the volute (11) extends outwards to be provided with a limiting portion (43), and the limiting portion (43) abuts against the noise reduction device (3) to limit the movement of the noise reduction device (3).

9. A range hood, comprising a fan (1), characterized in that, The noise reduction structure according to any one of claims 1 to 8 is provided on the blower (1).

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