CN214146043U - Noise reduction device capable of consuming shedding vortex energy and centrifugal fan - Google Patents
Noise reduction device capable of consuming shedding vortex energy and centrifugal fan Download PDFInfo
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- CN214146043U CN214146043U CN202021963341.6U CN202021963341U CN214146043U CN 214146043 U CN214146043 U CN 214146043U CN 202021963341 U CN202021963341 U CN 202021963341U CN 214146043 U CN214146043 U CN 214146043U
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Abstract
The utility model discloses a device of making an uproar and centrifugal fan fall of expendable vortex energy, fall the device of making an uproar and include the rotation axis, the rotation axis can rotate along with the rotation that drops the vortex be equipped with the protruding group of a plurality of protruding groups of a plurality of seconds and/or be in be connected with respectively at the both ends of rotation axis and be used for consuming the damping power consumption structure that drops the vortex energy, the rotation axis with damping power consumption structure rotatable coupling. The utility model discloses a device of making an uproar falls will design through the rotation axis for with damping power consumption structure rotatable coupling to make the rotation axis can rotate along with the rotation that drops the whirlpool, and be equipped with a plurality of first protruding groups on the rotation axis surface, with the energy that realizes catching and drops the whirlpool and dissipation and drop the whirlpool, effectively eliminated because of the noise that the energy that drops the whirlpool produced, and then the realization is showing the noise that reduces centrifugal fan.
Description
Technical Field
The utility model relates to a fan technical field especially relates to a device of making an uproar falls for fan.
Background
The range hood has become one of indispensable kitchen household electrical appliances in modern families, and air volume, wind pressure and noise are the core indexes of the range hood. In recent years, the domestic cigarette machine market mainly pushes the concepts of large air volume and large suction all the time, and along with the gradual improvement of the air volume, the noise generated by the range hood is also larger and larger. When the range hood is opened, the voice, the telephone sound, the doorbell sound and the child sound cannot be heard, even strong noise generated by the work of the range hood can cause adverse reactions such as dysphoria, headache, palpitation and the like to kitchen operators, and the serious influence on physical and mental health can be caused after the range hood is used for a long time.
With the improvement of the requirements of people on the living quality, users pay more and more attention to the noise parameter of the range hood when selecting and purchasing the range hood, and therefore the quality of the noise performance of the range hood is a key factor of the product competitiveness. Therefore, the noise becomes the technical problem to be solved urgently in the existing range hood.
Disclosure of Invention
The utility model discloses aim at solving one of the problems that exist among the prior art to a certain extent at least, for this reason, the utility model provides a device of making an uproar falls in expendable vortex energy, its simple structure, ingenious can eliminate the energy that drops the vortex to reach the mesh of making an uproar.
The utility model also provides a centrifugal fan with this device of making an uproar falls, through falling the device of making an uproar, can show the noise that reduces centrifugal fan work and produce, promote user experience and company's product competitiveness.
According to the noise reduction device capable of consuming shedding vortex energy, the technical scheme is as follows:
the utility model provides a device of making an uproar falls in expendable vortex energy that drops, the device of making an uproar falls includes the rotation axis, the rotation axis can rotate along with the rotation that drops the vortex be equipped with a plurality of first protruding groups and a plurality of second protruding groups of arranging along length direction interval on the rotation axis surface, and/or the both ends of rotation axis are connected with the damping power consumption structure that is used for consuming the vortex energy that drops respectively, the rotation axis with damping power consumption structure rotatable coupling.
In some embodiments, the rotating shaft is a hollow cylinder and the rotating shaft is made of plastic.
In some embodiments, the first protrusion group includes a plurality of first sub-protrusions arranged at intervals in the circumferential direction of the rotation axis, and the second protrusion group includes a plurality of second sub-protrusions arranged at intervals in the circumferential direction of the rotation axis.
In some embodiments, the damping energy dissipation structure includes a housing, a surface of the housing facing the rotating shaft is provided with an opening through which the rotating shaft passes, and an end of the rotating shaft passes through the opening and then extends into the housing.
In some embodiments, the damping energy dissipation structure further includes a plurality of elastic pieces, the elastic pieces are disposed in the housing, the connection ends of the elastic pieces are connected to the inner side wall of the housing, and the free ends of the elastic pieces extend to the outer side of the side wall of the rotating shaft.
In some embodiments, the number of the elastic pieces is two, and the free ends of the two elastic pieces are respectively located outside two opposite side walls of the rotating shaft.
In some embodiments, the housing is filled with a viscous fluid.
In some embodiments, the first set of projections is located between two of the shells and the second set of projections is located within and/or between the shells.
In some embodiments, the second protrusion group includes a plurality of second sub-protrusions arranged at intervals in a circumferential direction of the rotation shaft.
According to the centrifugal fan who provides above-mentioned, it realizes through following technical scheme:
the centrifugal fan comprises a volute and an impeller, wherein the volute is provided with an air inlet and an air outlet, the impeller is rotatably arranged in the volute, the centrifugal fan further comprises a noise reduction device, the noise reduction device is arranged at the position of the air outlet of the impeller, and two ends of the noise reduction device are respectively connected with the front face and the back face of the volute.
In some embodiments, the front face of the volute has a first arcuate region and a second arcuate region disposed around the air inlet, the first arcuate region disposed proximate to the air outlet, the second arcuate region disposed distal to the air outlet; the diameter of the rotating shaft positioned in the first arc-shaped area is 4-8 mm, and the diameter of the rotating shaft positioned in the second arc-shaped area is 1.5-5 mm.
Compared with the prior art, the utility model discloses an at least including following beneficial effect:
1. according to the noise reduction device, the rotating shaft is designed to be rotatably connected with the damping energy dissipation structure, so that the rotating shaft can rotate along with the rotation of the shedding vortex, and the plurality of first protrusion groups are arranged on the outer surface of the rotating shaft, so that the shedding vortex can be better captured, the energy of the shedding vortex can be better dissipated, the noise generated by the energy of the shedding vortex can be effectively eliminated, and the noise of the centrifugal fan can be obviously reduced;
2. according to the centrifugal fan, the noise reduction device is arranged at the air outlet of the impeller, so that the energy of falling vortexes can be eliminated, the noise of the fan is obviously reduced, and the user experience and the product competitiveness of a company are improved.
Drawings
Fig. 1 is an exploded schematic view of a noise reducing device according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a noise reduction device in embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a centrifugal fan in embodiment 1 of the present invention;
fig. 4 is a sectional view of a centrifugal fan in embodiment 1 of the present invention.
Fig. 5 is a schematic partial structure view of a noise reduction device in embodiment 2 of the present invention;
FIG. 6 is a schematic structural diagram of a noise reduction device in embodiment 3 of the present invention
Fig. 7 is a schematic structural diagram of another structure of the noise reduction device in embodiment 3 of the present invention.
Detailed Description
The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, modify or replace some technical features, without departing from the spirit of the present invention, it should be covered in the technical solution scope of the present invention.
Example 1
When the impeller of the centrifugal fan rotates, a strong pressure gradient is formed on the windward side and the leeward side of the impeller, so that a severe boundary layer fluid separation phenomenon is caused. Therefore, there are many flow separations in the impeller back pressure region, which are distributed at the impeller outlet in the form of shed vortices, and the energy of these shed vortices is a significant contributor to centrifugal fan noise.
Referring to fig. 1-2, the present embodiment provides a noise reducer capable of consuming energy of a shedding vortex, where the noise reducer 1 includes a rotating shaft 11 and a damping energy dissipation structure 12, where the rotating shaft 11 can rotate with rotation of the shedding vortex, a plurality of first protrusion groups 111 and a plurality of second protrusion groups 112 are disposed on an outer surface of the rotating shaft 11, and the first protrusion groups 111 and the second protrusion groups 112 are both used to better capture the shedding vortex. Two ends of the rotating shaft 11 are respectively connected with a damping energy dissipation structure 12 for dissipating energy of the shedding vortex, and the rotating shaft 11 is rotatably connected with the damping energy dissipation structure 12 to ensure that the rotating shaft 11 can rotate under the pushing of the shedding vortex.
It can be seen that the noise reduction device of this embodiment will be designed as and damping energy consumption structure 12 rotatable coupling through rotation axis 11 to make rotation axis 11 can rotate along with the rotation that drops the whirlpool, and be equipped with a plurality of first protruding group 111 on rotation axis 11 surface, in order to realize catching better and drop the whirlpool and dissipate the energy that drops the whirlpool, effectively eliminate the noise that produces because of the energy that drops the whirlpool, and then realize showing the noise that reduces centrifugal fan, promote user experience and company's product competitiveness.
Preferably, the rotating shaft 11 is a hollow cylinder, and the rotating shaft 11 is made of plastic, so that the rotating shaft 11 has lighter mass, and the rotating shaft 11 can rotate along with the rotation of the shedding vortex more conveniently, thereby improving the effects of capturing the shedding vortex and dissipating the energy of the shedding vortex.
Preferably, the first protrusion group 111 includes a plurality of first sub-protrusions (not shown in the drawings) spaced along the circumferential direction of the rotating shaft 11, so that on one hand, the local surface area of the rotating shaft 11 is increased, and thus the shedding vortex can be better captured; on the other hand, the friction force between the increased rotating shaft 11 of the first sub-protrusion and the shedding vortex is increased, so that the energy of the shedding vortex is further reduced, and the noise of the fan is obviously reduced. In this embodiment, the first sub-protrusions may be dots, spikes, saw teeth or other irregular shapes, so that the frequency spectrum of the falling vortex flowing through the first sub-protrusions becomes more discrete, thereby realizing automatic adjustment of the noise frequency spectrum.
Preferably, the second protrusion set 112 is located inside the damping dissipative structure 12, and is used for eliminating the shedding vortex energy entering the inside of the damping dissipative structure 12. In the present embodiment, the second protrusion set 112 includes several second sub-protrusions arranged at intervals along the circumferential direction of the rotating shaft 11, and the second sub-protrusions may be dots, spikes, serrations, or other irregular shapes.
Referring to fig. 1-2, preferably, the damping energy dissipation structure 12 includes a housing 121, a surface of the housing 121 facing the rotating shaft 11 is provided with an opening 1211 through which the rotating shaft 11 passes, and an end of the rotating shaft 11 passes through the opening 1211 and then extends into the housing 121, so that the rotating shaft 11 is rotatably mounted at the air outlet of the fan impeller through the housing 121 by providing the housing 121 at two ends of the rotating shaft 11.
More preferably, the casing 121 is filled with a viscous fluid, which serves as 9. a friction damping dissipative structure for dissipating energy of the shedding vortex to achieve further reduction of noise generated by the shedding vortex.
In this embodiment, an end of the housing 121 facing away from the opening 1211 has an opening 1212, and the opening 1212 abuts against an inner sidewall of the blower volute when the noise reduction device 1 is installed in the blower, so as to save manufacturing materials and facilitate filling of the viscous fluid. In other embodiments, the end of the housing 121 facing away from the opening 1211 can be closed to prevent viscous fluid from flowing out of the opening 1212.
Referring to fig. 3-4, the present embodiment further 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 disposed in the volute 2, and the centrifugal fan further includes the noise reduction device 1 as described above, the noise reduction device 1 is disposed at the air outlet 31 of the impeller 3, and two ends of the noise reduction device 1 are respectively connected to the front surface 201 and the back surface 202 of the volute 2. From this, the vortex that drops that fan work produced through the device 1 of making an uproar that falls, its energy can be consumed by the device 1 of making an uproar that falls to the noise that the realization is showing and is reducing the fan promotes the user and uses experience.
Specifically, the rotating shaft 11 of the noise reduction device 1 is rotatably disposed at the outlet of the air outlet 31, and two 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 the present embodiment, one end of the housing 121 having the opening 1212 may be bonded, welded, and fixed to the inner sidewall of the scroll casing 2, or the housing 121 may be fixed to the inner sidewall of the scroll casing 2 by using screws.
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, and correspondingly, the back surface 202 of the volute 2 has a corresponding first arc-shaped area 23 and second arc-shaped area 24, wherein the first arc-shaped area 23 is arranged close to the air outlet 22, and the second arc-shaped area 24 is arranged far from the air outlet 22. Since the first arc-shaped area 23 is arranged close to the air outlet 22, the shedding vortex size at the first arc-shaped area 23 is larger, and the shedding vortex size at the second arc-shaped area 24 is relatively smaller.
In order to better capture the shedding vortexes in different areas and different sizes, the diameter of the rotating shaft 11 located in the first arc-shaped area 23 is designed to be 4 mm-8 mm, and the diameter of the rotating shaft 11 located in the second arc-shaped area 24 is designed to be 1.5 mm-5 mm, so that the rotating shafts 11 in different sizes are designed according to different areas, the noise reduction device 1 is guaranteed to capture the shedding vortexes in different sizes, and the adaptability of products is improved.
Example 2
Referring to fig. 5, the present embodiment is different from embodiment 1 in that the damping dissipative structure 12 has a different structure. Specifically, the damping dissipative structure 12 of the present embodiment further includes a plurality of elastic pieces 122, the elastic pieces 122 are used as friction damping dissipative structures, and are disposed in the housing 121, and the connecting ends thereof are connected to the inner sidewall of the housing 121, and the free ends thereof extend to the outer side of the sidewall of the rotating shaft 11.
Preferably, the number of the elastic pieces 122 of the present embodiment is two, the free ends of the two elastic pieces 122 are respectively located outside the two opposite side walls of the rotating shaft 11, and other parts are the same as those of the embodiment 1.
It can be seen that, in the present embodiment, by using the plurality of elastic sheets 122 instead of the viscous fluid, the energy of the shedding vortex is consumed, and the noise generated by the shedding vortex is reduced, and meanwhile, the leakage of the viscous fluid and the problem of the sealing performance of the housing 1 do not need to be considered, so that the process requirement of the noise reduction device 1 is lower.
Example 3
Referring to fig. 6, the present embodiment is different from embodiment 1 in the structure of the noise reducer 1. Specifically, the noise reducer 1 of the present embodiment includes only the hollow rotating shaft 11, and a plurality of first protrusion groups 111 and second protrusion groups 112 are provided in the length direction of the rotating shaft 11. In the present embodiment, three first projection groups 111 constitute a first projection large group, ten second projection groups 112 constitute a second projection large group, and the first projection large group and the second projection large group are arranged alternately in the length direction of the rotary shaft 11. When the noise reduction device 1 is installed on the volute 2, two ends of the rotating shaft 11 are respectively and rotatably connected with the front surface and the back surface of the volute 2.
In other embodiments, referring to fig. 7, all the first protrusion sets 111 may be disposed between two second protrusion sets 112, and other portions are the same as those of the embodiments.
It can be seen that, this embodiment is when realizing consuming the vortex energy that drops, is showing the reduction fan noise at work, has saved damping power consumption structure 12 for the overall structure of the device of making an uproar 1 is fallen to this embodiment is simpler, optimizes manufacturing procedure, and manufacturing cost is lower.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (10)
1. The utility model provides a noise reduction device of expendable vortex energy that drops, characterized in that, noise reduction device includes rotation axis (11), rotation axis (11) can rotate along with the rotation of the vortex that drops be equipped with on rotation axis (11) surface along a plurality of first protruding group (111) and a plurality of second protruding group (112) of length direction arrangement, and/or the both ends of rotation axis (11) are connected with damping power consumption structure (12) respectively, rotation axis (11) with damping power consumption structure (12) rotatable coupling.
2. A noise reducer dissipating shedding vortex energy according to claim 1, wherein the rotating shaft (11) is a hollow cylinder and the rotating shaft (11) is made of plastic.
3. The noise reducer capable of dissipating shedding vortex energy according to claim 1, wherein the first protrusion group (111) comprises a plurality of first sub-protrusions spaced along a circumferential direction of the rotating shaft (11), and the second protrusion group (112) comprises a plurality of second sub-protrusions spaced along the circumferential direction of the rotating shaft (11).
4. The noise reducer capable of dissipating shedding vortex energy according to claim 1, wherein the damping and energy dissipating structure (12) comprises a housing (121), a surface of the housing (121) facing the rotating shaft (11) is provided with an opening for the rotating shaft (11) to pass through, and an end of the rotating shaft (11) passes through the opening and then protrudes into the housing (121).
5. The noise reducer capable of dissipating vortex shedding energy according to claim 4, wherein the damping and energy dissipating structure (12) further comprises a plurality of elastic pieces (122), the elastic pieces (122) are disposed in the housing (121) and have a connecting end connected to the inner sidewall of the housing (121) and a free end extending to the outside of the sidewall of the rotating shaft (11).
6. The noise reducer capable of dissipating shedding vortex energy according to claim 5, wherein the number of the elastic pieces (122) is two, and the free ends of the two elastic pieces (122) are respectively located outside two opposite sidewalls of the rotating shaft (11).
7. The noise reducer of claim 4, wherein the housing (121) is filled with a viscous fluid.
8. A noise reducer dissipating shedding vortex energy according to claim 5 or 7, wherein the first set of protrusions (111) is located between two shells (121), and the second set of protrusions (112) is located inside the shell (121) or between two shells (121).
9. A centrifugal fan comprising a volute (2) and an impeller (3), wherein the volute (2) has an air inlet (21) and an air outlet (22), the impeller (3) is rotatably disposed in the volute (2), and the centrifugal fan further comprises a noise reduction device according to any one of claims 1 to 8, the noise reduction device is disposed at an air outlet (31) of the impeller (3), and two ends of the noise reduction device are respectively connected to a front surface (201) and a back surface (202) of the volute (2).
10. A centrifugal fan according to claim 9, wherein the front face (201) of the volute (2) has a first arc-shaped area (23) and a second arc-shaped area (24) arranged around the inlet opening (21), the first arc-shaped area (23) being arranged close to the outlet opening (22), the second arc-shaped area (24) being arranged away from the outlet opening (22); the diameter of the rotating shaft (11) in the first arc-shaped area (23) is 4-8 mm, and the diameter of the rotating shaft (11) in the second arc-shaped area (24) is 1.5-5 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021963341.6U CN214146043U (en) | 2020-09-10 | 2020-09-10 | Noise reduction device capable of consuming shedding vortex energy and centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021963341.6U CN214146043U (en) | 2020-09-10 | 2020-09-10 | Noise reduction device capable of consuming shedding vortex energy and centrifugal fan |
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| Publication Number | Publication Date |
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| CN214146043U true CN214146043U (en) | 2021-09-07 |
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| CN202021963341.6U Active CN214146043U (en) | 2020-09-10 | 2020-09-10 | Noise reduction device capable of consuming shedding vortex energy and centrifugal fan |
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| CN (1) | CN214146043U (en) |
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