A noise reduction device capable of consuming the energy of shed vortices and a centrifugal fan

Abstract

The present invention discloses a noise reduction device and a centrifugal fan capable of consuming the energy of shed vortices. The noise reduction device includes a rotating shaft, which can rotate with the rotation of the shed vortices. A number of first protrusion groups are arranged at intervals along the length direction on the outer surface of the rotating shaft, and / or damping energy dissipation structures for consuming the energy of the shed vortices are respectively connected to both ends of the rotating shaft. The rotating shaft is rotatably connected to the damping energy dissipation structures. In the noise reduction device of the present invention, the rotating shaft is designed to be rotatably connected to the damping energy dissipation structures, so that the rotating shaft can rotate with the rotation of the shed vortices. A number of first protrusion groups are arranged on the outer surface of the rotating shaft to capture the shed vortices and dissipate the energy of the shed vortices, effectively eliminating the noise generated by the energy of the shed vortices, and thus significantly reducing the noise of the centrifugal fan.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to a noise reduction device for a fan. Background Art

[0002] The range hood has become one of the indispensable kitchen appliances in modern families. Air volume, air pressure, and noise are the core indicators of the range hood. In recent years, the domestic range hood market has been mainly promoting the concept of large air volume and strong suction. With the gradual increase of the air volume, the noise generated by the range hood is also getting louder. When the range hood is turned on, one can't hear conversations, phone calls, doorbells, or children's voices. Even the strong noise generated by the operation of the range hood can cause adverse reactions such as irritability, headache, and palpitation in kitchen operators. Long-term use will have a serious impact on physical and mental health.

[0003] 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 seen that the quality of the noise performance of the range hood is a key factor in product competitiveness. 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 a certain extent. For this purpose, the present invention provides a noise reduction device that can consume the energy of the shed vortex, which has a simple and ingenious structure and can eliminate the energy of the shed vortex, thereby achieving the purpose of noise reduction.

[0005] The present invention also provides a centrifugal fan with the noise reduction device. Through the noise reduction device, the noise generated by the operation of the centrifugal fan can be significantly reduced, improving the user experience and the product competitiveness of the company.

[0006] According to the above-provided noise reduction device that can consume the energy of the shed vortex, it is realized through the following technical solutions:

[0007] A noise reduction device that can consume the energy of the shed vortex, the noise reduction device includes a rotating shaft, the rotating shaft can rotate with the rotation of the shed vortex, and a plurality of first protrusion groups are arranged at intervals along the length direction on the outer surface of the rotating shaft, and / or damping energy-consuming structures for consuming the energy of the shed vortex are respectively connected to both ends of the rotating shaft, and the rotating shaft is rotatably connected to the damping energy-consuming structures.

[0008] In some embodiments, the rotating shaft is a hollow cylinder and is made of plastic.

[0009] In some embodiments, the first protrusion group includes a plurality of first sub-protrusions arranged at intervals in the circumferential direction of the rotating shaft.

[0010] In some embodiments, the damping energy dissipation structure includes a housing. On one side of the housing facing the rotating shaft, there is an opening through which the rotating shaft passes, and the end of the rotating shaft extends into the housing after passing through the opening.

[0011] In some embodiments, the damping energy dissipation structure further includes a plurality of elastic sheets. The elastic sheets are arranged inside the housing, and their connecting ends are connected to the inner side wall of the housing, and the free ends extend to the outside of the side wall of the rotating shaft.

[0012] In some embodiments, the number of the elastic sheets is two, and the free ends of the two elastic sheets are respectively located outside the opposite side walls of the rotating shaft.

[0013] In some embodiments, a viscous fluid is filled inside the housing.

[0014] In some embodiments, the first convex group is located between the two housings. On the outer surface of the rotating shaft, there are also a plurality of second convex groups arranged along the length direction. The second convex groups are located inside the housing and / or between the two housings.

[0015] In some embodiments, the second convex group includes a plurality of second sub-convexes arranged at intervals in the circumferential direction of the rotating shaft.

[0016] According to a centrifugal fan provided above, it is realized through the following technical solutions:

[0017] A centrifugal fan includes a volute and an impeller. The volute has an air inlet and an air outlet. The impeller is rotatably arranged inside the volute. Further included is a noise reduction device as described above. The noise reduction device is provided at the air outlet hole of the impeller, and both ends of the noise reduction device are respectively connected to the front and back of the volute.

[0018] In some embodiments, the front of the volute has a first arc region and a second arc region arranged around the air inlet. The first arc region is arranged close to the air outlet, and the second arc region is arranged far from the air outlet; the diameter of the rotating shaft located in the first arc region is 4 mm to 8 mm, and the diameter of the rotating shaft located in the second arc region is 1.5 mm to 5 mm.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. The noise reduction device of the present invention is designed to be rotatably connected to the damping energy dissipation structure through a rotating shaft, so that the rotating shaft can rotate with the rotation of the shedding vortex. A number of first protrusion groups are provided on the outer surface of the rotating shaft to better capture the shedding vortex and dissipate the energy of the shedding vortex, effectively eliminating the noise generated by the energy of the shedding vortex, and thus significantly reducing the noise of the centrifugal fan;

[0021] 2. The centrifugal fan of the present invention can eliminate the energy of the shedding vortex by setting a noise reduction device at the air outlet hole of the impeller, significantly reducing the noise of the fan and improving the user experience and the product competitiveness of the company. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic exploded view of the structure of the noise reduction device in Embodiment 1 of the present invention;

[0023] Figure 2 is a schematic view of the structure of the noise reduction device in Embodiment 1 of the present invention;

[0024] Figure 3 is a schematic view of the structure of the centrifugal fan in Embodiment 1 of the present invention;

[0025] Figure 4 is a cross-sectional view of the centrifugal fan in Embodiment 1 of the present invention.

[0026] Figure 5 is a schematic view of a partial structure of the noise reduction device in Embodiment 2 of the present invention;

[0027] Figure 6 is a schematic view of the structure of the noise reduction device in Embodiment 3 of the present invention

[0028] Figure 7 is a schematic view of the structure of another structure of the noise reduction device in Embodiment 3 of the present invention;

[0029] Figure 8 is a schematic view of the structure of the noise reduction device in Embodiment 4 of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0030] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific implementation manners of the present invention or equivalently replacing some technical features without departing from the spirit of the present invention scheme shall be covered within the scope of the technical solution claimed by the present invention.

[0031] Embodiment 1

[0032] When the impeller of a centrifugal fan rotates, a strong pressure gradient will be formed on the windward and leeward sides of the impeller, resulting in serious boundary layer fluid separation. Therefore, there are many flow separations in the impeller backpressure area. These flow separations are distributed at the impeller air outlet holes in the form of shedding vortices, and the energy of these shedding vortices is an important source of the noise of the centrifugal fan.

[0033] See Figure 1-2 , this embodiment provides a noise reduction device that can consume the energy of the shedding vortices. The noise reduction device 1 includes a rotating shaft 11 and a damping energy dissipation structure 12. Among them, the rotating shaft 11 can rotate with the rotation of the shedding vortices. A number of first protrusion groups 111 are arranged at intervals along the length direction on the outer surface of the rotating shaft 11. The first protrusion groups 111 are used to better capture the shedding vortices. Damping energy dissipation structures 12 for consuming the energy of the shedding vortices are respectively connected to both ends of the rotating shaft 11. The rotating shaft 11 is rotatably connected to the damping energy dissipation structure 12 to ensure that the rotating shaft 11 can rotate self - clockwise under the drive of the shedding vortices.

[0034] It can be seen that in the noise reduction device of this embodiment, the rotating shaft 11 is designed to be rotatably connected to the damping energy dissipation structure 12, so that the rotating shaft 11 can rotate with the rotation of the shedding vortices. And a number of first protrusion groups 111 are arranged on the outer surface of the rotating shaft 11 to better capture the shedding vortices and dissipate the energy of the shedding vortices, effectively eliminating the noise generated by the energy of the shedding vortices, and then significantly reducing the noise of the centrifugal fan and improving the user experience and the competitiveness of the company's products.

[0035] Preferably, the rotating shaft 11 is a hollow cylinder and is made of plastic. In this way, the mass of the rotating shaft 11 can be made lighter, which is more convenient for the rotating shaft 11 to rotate with the rotation of the shedding vortices, and then improve the effect of capturing the shedding vortices and dissipating the energy of the shedding vortices.

[0036] Preferably, the first protrusion group 111 includes a number of first sub - protrusions arranged at intervals along the circumferential direction of the rotating shaft 11. In this way, a number of first sub - protrusions (not shown in the figure) arranged at intervals along the circumferential direction of the rotating shaft 11, on the one hand, increases the local surface area of the rotating shaft 11, so as to better capture the shedding vortices; on the other hand, increases the friction between the first sub - protrusions and the shedding vortices of the rotating shaft 11, making the energy of the shedding vortices further reduced, and then significantly reducing the noise of the fan. In this embodiment, the first sub - protrusions can be round dots, spikes, saw - teeth or other irregular shapes. In this way, the frequency spectrum of the shedding vortices flowing through the first sub - protrusions becomes more discrete, thus realizing the automatic adjustment of the noise frequency spectrum.

[0037] More preferably, a plurality of second protrusion groups 112 arranged along the length direction are further provided on the outer surface of the rotating shaft 11. The second protrusion groups 112 are located inside the damping and energy dissipation structure 12 and are used to eliminate the energy of the shedding vortices entering the inside of the damping and energy dissipation structure 12. In this embodiment, the second protrusion groups 112 include a plurality of second sub-protrusions arranged at intervals in the circumferential direction of the rotating shaft 11, and the second sub-protrusions can be round dots, spikes, saw teeth or other irregular shapes.

[0038] See Figure 1-2 , preferably, the damping and energy dissipation structure 12 includes a housing 121. An opening 1211 for the rotating shaft 11 to pass through is provided on one side of the housing 121 facing the rotating shaft 11. The end of the rotating shaft 11 passes through the opening 1211 and extends into the housing 121. In this way, by providing the housing 121 at both ends of the rotating shaft 11, it is convenient to rotatably mount the rotating shaft 11 at the air outlet of the fan impeller through the housing 121.

[0039] More preferably, a viscous fluid is filled in the housing 121. This viscous fluid serves as a 9. friction damping and energy dissipation structure and is used to consume the energy of the shedding vortices to further reduce the noise generated by the shedding vortices.

[0040] In this embodiment, one end of the housing 121 facing away from the opening 1211 has an opening 1212. When the noise reduction device 1 is installed in the fan, the opening 1212 abuts against the inner side wall of the fan volute to save manufacturing materials and facilitate the filling of the viscous fluid. In other embodiments, one end of the housing 121 facing away from the opening 1211 can also be closed to prevent the viscous fluid from flowing out through the opening 1212.

[0041] See Figure 3-4 , this embodiment also provides a centrifugal fan, which includes a volute 2 and an impeller 3. The volute 2 has an air inlet 21 and an air outlet 22. The impeller 3 is rotatably arranged in the volute 2, and further includes the noise reduction device 1 as described above. The noise reduction device 1 is provided at the air outlet 31 of the impeller 3, and both ends of the noise reduction device 1 are respectively connected to the front surface 201 and the back surface 202 of the volute 2. Thus, the shedding vortices generated during the operation of the fan flow through the noise reduction device 1, and their energy will be consumed by the noise reduction device 1, thereby significantly reducing the noise of the fan and improving the user experience.

[0042] Specifically, the rotating shaft 11 of the noise reduction device 1 is rotatably arranged at the outlet of the air outlet 31, and both ends of the rotating shaft 11 are respectively connected to the front surface 201 and the back surface 202 of the volute 2 through the housing 121. In this embodiment, the end of the housing 121 with the opening 1212 can be bonded or welded to the inner side wall of the volute 2, or the housing 121 can be fixed to the inner side wall of the volute 2 by screws.

[0043] Preferably, the front surface 201 of the volute 2 has a first arc-shaped area 23 and a second arc-shaped area 24 arranged around the air inlet 21. Correspondingly, the back surface 202 of the volute 2 has the corresponding first arc-shaped area 23 and second arc-shaped area 24. Among them, the first arc-shaped area 23 is arranged close to the air outlet 22, and the second arc-shaped area 24 is arranged away from the air outlet 22. Since the first arc-shaped area 23 is arranged close to the air outlet 22, the size of the shedding vortex in the first arc-shaped area 23 is relatively large, while the size of the shedding vortex in the second arc-shaped area 24 is relatively small.

[0044] To better capture the shedding vortices of different regions and different sizes, in this embodiment, the diameter of the rotating shaft 11 located in the first arc-shaped area 23 is designed to be 4 mm to 8 mm, while the diameter of the rotating shaft 11 located in the second arc-shaped area 24 is designed to be 1.5 mm to 5 mm. In this way, the rotating shafts 11 of different sizes are designed according to different regions, and further, it is ensured that the noise reduction device 1 can capture the shedding vortices of different sizes, improving the adaptability of the product.

[0045] Embodiment 2

[0046] Reference Figure 5 In this embodiment, the difference from Embodiment 1 is that the structure of the damping energy dissipation structure 12 is different. Specifically, the damping energy dissipation structure 12 of this embodiment further includes a plurality of elastic sheets 122. The elastic sheets 122, as the friction damping energy dissipation structure, are arranged in the housing 121 and their connecting ends are connected to the inner side wall of the housing 121, and the free ends extend to the outside of the side wall of the rotating shaft 11.

[0047] Preferably, the number of the elastic sheets 122 in this embodiment is two, and the free ends of the two elastic sheets 122 are respectively located outside the opposite side walls of the rotating shaft 11, and other parts are the same as those in Embodiment 1.

[0048] It can be seen that in this embodiment, by using a plurality of elastic sheets 122 to replace the viscous fluid, while achieving the consumption of the energy of the shedding vortex and reducing the noise generated by the shedding vortex, there is no need to consider the leakage of the viscous fluid and the sealing problem of the housing 1, so that the process requirements of the noise reduction device 1 are lower.

[0049] Embodiment 3

[0050] Reference Figure 6, the difference between this embodiment and Embodiment 1 lies in the different structure of the noise reduction device 1. Specifically, the noise reduction device 1 of this embodiment only includes a hollow rotating shaft 11, and a number of first protrusion groups 111 and second protrusion groups 112 are provided in the length direction of the rotating shaft 11. Three first protrusion groups 111 in this embodiment form a first large protrusion group, and ten second protrusion groups 112 form a second large protrusion group, and the first large protrusion group and the second large protrusion group are arranged alternately along the length direction of the rotating shaft 11. When the noise reduction device 1 is installed on the volute 2, both ends of the rotating shaft 11 are rotatably connected to the front and back of the volute 2 respectively.

[0051] In other embodiments, refer to Figure 7 , all the first protrusion groups 111 can be arranged between two second protrusion groups 112, and other parts are the same as those in the embodiment.

[0052] It can be seen that while this embodiment realizes the consumption of the energy of the shedding vortex and significantly reduces the working noise of the fan, the damping energy-consuming structure 12 is omitted, making the overall structure of the noise reduction device 1 in this embodiment simpler, optimizing the processing procedure, and having a lower manufacturing cost.

[0053] Embodiment 4

[0054] Refer to Figure 8 , the difference between this embodiment and Embodiment 1 or 2 lies in the different structure of the rotating shaft 11. Specifically, damping energy-consuming structures 12 are respectively provided at both ends of the rotating shaft 11, and the rotating shaft 11 is rotatably connected to the front and back of the volute 2 through the damping energy-consuming structures 12 and is located at the air outlet hole of the impeller. Only the second protrusion group 112 located at both ends of the rotating shaft 11 is provided on the surface of the rotating shaft 11, and this second protrusion group 112 is located inside the damping energy-consuming structure 12, and other parts are the same as those in Embodiment 1 or 2.

[0055] It can be seen that by omitting the first protrusion groups 111 on the surface of the rotating shaft 11 in this embodiment, the overall structure of the rotating shaft 11 is simpler, which is more convenient for the rapid processing and forming of the rotating shaft 11, and the manufacturing cost is lower.

[0056] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A noise reduction device capable of consuming the energy of shed vortices, characterized in that The noise reduction device includes a rotating shaft (11). The rotating shaft (11) is a hollow cylinder and can rotate with the rotation of the shedding vortex. A number of first protrusion groups (111) are arranged at intervals along the length direction on the outer surface of the rotating shaft (11). Damping energy dissipation structures (12) for consuming the energy of the shedding vortex are respectively connected to both ends of the rotating shaft (11), and the rotating shaft (11) is rotatably connected to the damping energy dissipation structures (12). Wherein, the damping energy dissipation structure (12) includes a housing (121). An opening (1211) for the rotating shaft (11) to pass through is provided on one side of the housing (121) facing the rotating shaft (11), and a friction damping energy dissipation structure is provided inside the housing (121). The end of the rotating shaft (11) passes through the opening (1211) and extends into the housing (121).

2. The noise reduction device capable of consuming shed vortex energy according to claim 1, characterized in that, The rotating shaft (11) is made of plastic.

3. A noise reduction device capable of consuming the energy of shed vortices according to claim 1, characterized in that, The first protrusion group (111) includes a number of first sub-protrusions arranged at intervals in the circumferential direction of the rotating shaft (11).

4. The noise reduction device capable of consuming the energy of shed vortices according to claim 1, wherein, The damping energy dissipation structure (12) further includes a number of elastic sheets (122). The elastic sheets (122) serve as the friction damping energy dissipation structure. The elastic sheets (122) are arranged inside the housing (121), and their connecting ends are connected to the inner side wall of the housing (121), and the free ends extend to the outside of the side wall of the rotating shaft (11).

5. The noise reduction device capable of consuming the energy of shed vortices according to claim 4, wherein, The number of the elastic sheets (122) is two, and the free ends of the two elastic sheets (122) are respectively located outside the opposite side walls of the rotating shaft (11).

6. The noise reduction device capable of consuming shed vortex energy according to claim 1, wherein, A viscous fluid is filled inside the housing (121), and the viscous fluid serves as the friction damping energy dissipation structure.

7. A noise reduction device capable of consuming shed vortex energy according to any one of claims 1-6, characterized in that The first protrusion group (111) is located between the two housings (121). A number of second protrusion groups (112) are also arranged along the length direction on the outer surface of the rotating shaft (11), and the second protrusion groups (112) are located inside the housing (121) and / or between the two housings (121).

8. A noise reduction device capable of consuming the energy of shed vortices according to claim 7, characterized in that, The second protrusion group (112) includes a number of second sub-protrusions arranged at intervals in the circumferential direction of the rotating shaft (11).

9. A centrifugal fan, comprising a volute (2) and an impeller (3), the volute (2) having an air inlet (21) and an air outlet (22), the impeller (3) being rotatably disposed within the volute (2), characterized in that, It further includes the noise reduction device according to any one of claims 1-8. The noise reduction device is provided at the outlet of the air outlet hole (31) of the impeller (3), and both ends of the noise reduction device are respectively connected to the front surface (201) and the back surface (202) of the volute (2).

10. A centrifugal fan according to claim 9, characterized in that, The front surface (201) of the volute (2) has a first arc region (23) and a second arc region (24) arranged around the air inlet (21). The first arc region (23) is arranged close to the air outlet (22), and the second arc region (24) is arranged far from the air outlet (22). The diameter of the rotating shaft (11) located in the first arc region (23) is 4 mm to 8 mm, and the diameter of the rotating shaft (11) located in the second arc region (24) is 1.5 mm to 5 mm.

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