CN210660728U - Low-noise axial-flow impeller structure with muffling cavity - Google Patents
Low-noise axial-flow impeller structure with muffling cavity Download PDFInfo
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- CN210660728U CN210660728U CN201920163595.0U CN201920163595U CN210660728U CN 210660728 U CN210660728 U CN 210660728U CN 201920163595 U CN201920163595 U CN 201920163595U CN 210660728 U CN210660728 U CN 210660728U
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- 230000030279 gene silencing Effects 0.000 claims abstract description 34
- 230000008030 elimination Effects 0.000 claims abstract description 11
- 238000003379 elimination reaction Methods 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 230000001743 silencing effect Effects 0.000 abstract description 3
- 239000011358 absorbing material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000006260 foam Substances 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The utility model relates to a low-noise axial-flow impeller structure with a silencing cavity, which comprises an impeller body, wherein the impeller body comprises blades and a hub arranged at the center of the impeller body; and a sound attenuation structure is arranged between the blade and the hub. The utility model has the advantages that: (1) the impeller has a simple structure and is suitable for daily fans; (2) the impeller is provided with a noise elimination structure on a hub, and turbulent kinetic energy of the root of a blade is absorbed, so that the aim of reducing noise is fulfilled; (3) sound absorption materials can be filled in the silencing cavity to enhance silencing effect; (4) the cover plate and the hub form a cavity, the periphery of the cover plate is connected with the hub in a seamless mode, sound waves are guaranteed to enter the cavity from the small holes and oscillate in the cavity, and the sound waves cannot be transmitted out through a gap between the cover plate and the hub.
Description
Technical Field
The utility model relates to an impeller structure of low noise, in particular to take axial-flow impeller structure of low noise of amortization chamber.
Background
The impeller is an indispensable part of the fan, and the impeller noise mainly consists of rotation noise and vortex noise, wherein the rotation noise is mainly low-frequency discrete noise and is a main factor influencing the sound quality of the fan. As the rotational speed increases, the rotational noise having a dominant low-frequency component increases more significantly than the eddy noise, and the noise of the low-frequency "hum" becomes more prominent.
In the prior art, noise reduction of an axial flow impeller structure is mostly started from the aspects of changing the number of blades, the blade spacing, the shape of the blades and the like, for example, an unequal-distance multi-blade axial flow fan blade is adopted, compared with an equidistant axial flow fan blade, the mode can change a single blade passing frequency into noise of a plurality of blade passing frequencies, the mode is equivalent to replacing single noise with broadband noise, and although the sound quality is improved a lot, the amplitude of the noise cannot be reduced. Therefore, a new noise reduction direction is provided for the noise reduction of the fan by taking the wind guide ring as a breakthrough point and the noise reduction type wind guide ring.
Chinese patent 201811452348.8 discloses a noise reduction type fan guide ring and a fan comprising the same, wherein the fan comprises a fan, guide vanes and a guide ring, wherein the wind-guiding ring comprises a wind-guiding ring side wall and a resonance cavity, the wind-guiding ring side wall comprises a contraction section, a transition section and an expansion section, the inner surface of the wind-guiding ring side wall close to one side of the guide vane is provided with a plurality of tiny through holes, the side wall of the resonance cavity is a closed surface, a resonance cavity is formed between the wind-guiding ring side wall surface and the side wall of the resonance cavity, a partition board and a vertical board are arranged in the resonance cavity to form unit resonance cavities with different volumes, the volumes of the cavities of the unit resonance cavities are different, different resonance frequencies can be obtained, when frequency noise close to the, the energy of the frequency noise is reduced due to the continuous reflection in the resonant cavity, and finally the effect of reducing the medium and low frequency noise is achieved. Aiming at high-frequency noise, sound-absorbing materials are filled in partial unit resonant cavities to effectively reduce the noise of the high-frequency noise.
However, the wind guide ring of the fan is complex in structure, a plurality of chambers are designed in the wind guide ring, the cost is high, and the wind guide ring is not suitable for daily fans; and the resonant cavity only reflects and reduces frequency noise with similar resonant frequency, and the noise reduction effect is limited.
When the impeller rotates, the pressure difference between the pressure surface and the suction surface of the blade causes the front edge and the rear edge of the blade to respectively generate turbulent kinetic energy with different intensities, and the turbulent kinetic energy is a main source of aerodynamic noise. Therefore, if these turbulent kinetic energies are reduced, the noise is also reduced.
Disclosure of Invention
In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a simple structure is applicable to daily fan, the good low noise axial-flow type impeller structure of noise reduction effect.
The technical proposal of the utility model for solving the technical problem is that:
a low-noise axial-flow impeller structure with a silencing cavity comprises an impeller body, wherein the impeller body comprises blades and a hub arranged at the center of the impeller body; and a sound attenuation structure is arranged between the blade and the hub.
Furthermore, the noise elimination structure comprises a bottom plate which is integrally formed with the hub, a cover plate is arranged on the upper cover of the bottom plate, and the cover plate comprises a plate surface with a small hole and a cover plate wall at the edge of the plate surface.
Furthermore, a convex column is arranged on the inner surface of the cover plate corresponding to the small hole.
Furthermore, an air guide ring is arranged on the outer side of the silencing structure, and the cover plate is clamped between the hub and the air guide ring and is in seamless connection with the hub and the air guide ring.
Furthermore, the bottom plate and the cover plate are provided with positioning connection structures.
Furthermore, the small holes are arranged in a radiation mode from the inner ring to the outer side.
Furthermore, the diameter of the small holes is 1.6 millimeters, and the number of the small holes is 150.
Furthermore, the cover plate and the bottom plate form a silencing cavity in an enclosing mode, and sound absorption materials are filled in the silencing cavity.
Furthermore, the silencing structure is positioned on the air inlet side or the air outlet side or the air inlet side and the air outlet side of the impeller body.
Furthermore, the blades are annularly arranged on the outer side of the air guide ring.
The utility model discloses unanimous with general fan impeller when using, do not do here and describe repeatedly.
The utility model discloses a based on helmholtz principle, on traditional wheel hub's basis, structure anechoic chamber.
As the impeller rotates, the air at the root of the blade produces a periodic vibration, the period of which is synchronized with the rotation of the impeller. The waves generated by this periodic vibration force the air in the muffling chamber to be compressed through the small holes, and accordingly, the air in the muffling chamber moves vibrationally in synchronization. At this time, the air in the sound attenuation chamber acts as an air spring. Because the geometric dimension of each small hole in the silencing cavity is far smaller than the wavelength of sound waves, the kinetic energy of air in the cavity is concentrated in the cavity to move, so that the turbulent kinetic energy of the root of the blade related to the rotation fundamental frequency is absorbed, and the aim of silencing is fulfilled.
The utility model has the advantages that: (1) the impeller has a simple structure and is suitable for daily fans; (2) the impeller is provided with a noise elimination structure on a hub, and turbulent kinetic energy of the root of a blade is absorbed, so that the aim of reducing noise is fulfilled; (3) sound absorption materials can be filled in the silencing cavity to enhance silencing effect; (4) the cover plate and the hub form a cavity, the periphery of the cover plate is connected with the hub in a seamless mode, sound waves are guaranteed to enter the cavity from the small holes and oscillate in the cavity, and the sound waves cannot be transmitted out through a gap between the cover plate and the hub.
Drawings
Fig. 1 is a structural view of the present invention.
Fig. 2 is a structural view of the inner surface of the cover plate.
Fig. 3 is an exploded view of embodiment 1.
Fig. 4 is an exploded view of embodiment 2.
Fig. 5 is an exploded view of embodiment 3.
The attached drawings are marked with: 100. the impeller comprises blades 200, a hub 300, an air guide ring 400, a cover plate 500, a bottom plate 600, an impeller body 401, a plate surface 402, a cover plate wall 403, a convex column 404, a groove 405, a small hole 501 and a screw column.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1 to 3, a low-noise axial-flow impeller structure with a muffling cavity includes an impeller body 600, where the impeller body 600 includes blades 100 and a hub 200 disposed at the center of the impeller body 600; a sound-damping structure is provided between the blade 100 and the hub 200.
In this embodiment, the noise elimination structure includes a bottom plate 500 integrally formed with the hub 200, a cover plate 400 is disposed on the bottom plate 500, and the cover plate 400 includes a plate surface 401 with a small hole 405 and a cover plate wall 402 at the inner and outer ring edges of the plate surface 401. After the bottom plate 500 and the cover plate 400 are assembled, a closed silencing cavity is formed, and air can enter the silencing cavity through the small holes 405 in the cover plate 400 to be silenced.
In this embodiment, the inner surface of the cover plate 400 is provided with a convex pillar 403 at a position corresponding to the small hole 405. The convex column is internally provided with a vent hole communicated with the small hole, so that most of air entering from the small hole 405 can enter the silencing cavity to be prevented from escaping.
In this embodiment, an air guiding ring 300 is disposed outside the sound attenuation structure, and the cover plate 400 is clamped between the hub 200 and the air guiding ring 300 and is assembled with the hub 200 and the air guiding ring 300 in a seamless manner. Ensuring that sound waves enter the anechoic chamber from the aperture 405 and do not propagate out of the gap.
In this embodiment, the bottom plate 500 and the cover plate 400 are provided with a positioning connection structure. The bottom plate 500 is provided with screw columns 501, the lower surface of the cover plate 400 is provided with sunken grooves 404 matched with the screw columns 501, and the screw columns 501 are clamped in the sunken grooves 404 and are fixedly connected through screws.
In this embodiment, the small holes 405 are radially arranged from the inner ring to the outer ring.
In this embodiment, aperture 405 diameter is 1.6 millimeters, aperture number is 150, according to helmholtz's principle, to specific frequency, reasonable design cavity volume, little empty space, degree of depth and number obtain better noise reduction effect.
In this embodiment, the cover plate and the bottom plate enclose a silencing cavity, and the silencing cavity is filled with a sound-absorbing material. The sound absorbing material may reduce noise, such as high frequency noise, in the fan that cannot be absorbed by the sound-deadening chamber. Since the wavelength of the high-frequency noise is short, noise cannot be reduced in the noise elimination cavity, and thus, it is necessary to effectively reduce noise using a sound absorbing material. The sound absorption material is one or more of organic fiber, inorganic foam or foam plastic and the like.
In this embodiment, the sound attenuation structure is located on the air inlet side of the impeller body 600.
Example 2
As shown in fig. 1 to 3, a low-noise axial-flow impeller structure with a muffling cavity includes an impeller body 600, where the impeller body 600 includes blades 100 and a hub 200 disposed at the center of the impeller body 600; a sound-damping structure is provided between the blade 100 and the hub 200.
In this embodiment, the noise elimination structure includes a bottom plate 500 integrally formed with the hub 200, a cover plate 400 is disposed on the bottom plate 500, and the cover plate 400 includes a plate surface 401 with a small hole 405 and a cover plate wall 402 at the inner and outer ring edges of the plate surface 401. After the bottom plate 500 and the cover plate 400 are assembled, a closed silencing cavity is formed, and air can enter the silencing cavity through the small holes 405 in the cover plate 400 to be silenced.
In this embodiment, the inner surface of the cover plate 400 is provided with a convex pillar 403 at a position corresponding to the small hole 405. The convex column is internally provided with a vent hole communicated with the small hole, so that most of air entering from the small hole 405 can enter the silencing cavity to be prevented from escaping.
In this embodiment, an air guiding ring 300 is disposed outside the sound attenuation structure, and the cover plate 400 is clamped between the hub 200 and the air guiding ring 300 and is assembled with the hub 200 and the air guiding ring 300 in a seamless manner. Ensuring that sound waves enter the anechoic chamber from the aperture 405 and do not propagate out of the gap.
In this embodiment, the bottom plate 500 and the cover plate 400 are provided with a positioning connection structure. The bottom plate 500 is provided with screw columns 501, the lower surface of the cover plate 400 is provided with sunken grooves 404 matched with the screw columns 501, and the screw columns 501 are clamped in the sunken grooves 404 and are fixedly connected through screws.
In this embodiment, the small holes 405 are radially arranged from the inner ring to the outer ring.
In this embodiment, aperture 405 diameter is 1.6 millimeters, aperture number is 150, according to helmholtz's principle, to specific frequency, reasonable design cavity volume, little empty aperture, degree of depth and number obtain better noise reduction effect.
In this embodiment, the cover plate and the bottom plate enclose a silencing cavity, and the silencing cavity is filled with a sound-absorbing material. The sound absorbing material may reduce noise, such as high frequency noise, in the fan that cannot be absorbed by the sound-deadening chamber. Since the wavelength of the high-frequency noise is short, noise cannot be reduced in the noise elimination cavity, and thus, it is necessary to effectively reduce noise using a sound absorbing material. The sound absorption material is one or more of organic fiber, inorganic foam or foam plastic and the like.
In this embodiment, the sound attenuation structure is located on the air outlet side of the impeller body 600.
Example 3
As shown in fig. 1 to 3, a low-noise axial-flow impeller structure with a muffling cavity includes an impeller body 600, where the impeller body 600 includes blades 100 and a hub 200 disposed at the center of the impeller body 600; a sound-damping structure is provided between the blade 100 and the hub 200.
In this embodiment, the noise elimination structure includes a bottom plate 500 integrally formed with the hub 200, a cover plate 400 is disposed on the bottom plate 500, and the cover plate 400 includes a plate surface 401 with a small hole 405 and a cover plate wall 402 at the inner and outer ring edges of the plate surface 401. After the bottom plate 500 and the cover plate 400 are assembled, a closed silencing cavity is formed, and air can enter the silencing cavity through the small holes 405 in the cover plate 400 to be silenced.
In this embodiment, the inner surface of the cover plate 400 is provided with a convex pillar 403 at a position corresponding to the small hole 405. The convex column is internally provided with a vent hole communicated with the small hole, so that most of air entering from the small hole 405 can enter the silencing cavity to be prevented from escaping.
In this embodiment, an air guiding ring 300 is disposed outside the sound attenuation structure, and the cover plate 400 is clamped between the hub 200 and the air guiding ring 300 and is assembled with the hub 200 and the air guiding ring 300 in a seamless manner. Ensuring that sound waves enter the anechoic chamber from the aperture 405 and do not propagate out of the gap.
In this embodiment, the bottom plate 500 and the cover plate 400 are provided with a positioning connection structure. The bottom plate 500 is provided with screw columns 501, the lower surface of the cover plate 400 is provided with sunken grooves 404 matched with the screw columns 501, and the screw columns 501 are clamped in the sunken grooves 404 and are fixedly connected through screws.
In this embodiment, the small holes 405 are radially arranged from the inner ring to the outer ring.
In this embodiment, aperture 405 diameter is 1.6 millimeters, aperture number is 150, according to helmholtz's principle, to specific frequency, reasonable design cavity volume, aperture, degree of depth and number, obtain better noise reduction effect.
In this embodiment, the cover plate and the bottom plate enclose a silencing cavity, and the silencing cavity is filled with a sound-absorbing material. The sound absorbing material may reduce noise, such as high frequency noise, in the fan that cannot be absorbed by the sound-deadening chamber. Since the wavelength of the high-frequency noise is short, noise cannot be reduced in the noise elimination cavity, and thus, it is necessary to effectively reduce noise using a sound absorbing material. The sound absorption material is one or more of organic fiber, inorganic foam or foam plastic and the like.
In this embodiment, the sound attenuation structure is located on the air outlet side and the air inlet side of the impeller body 600. The wind to the air inlet side and the air-out side makes an uproar, and the noise reduction effect is better.
The embodiments 1 to 3 are the same as the general fan impeller when in use, and are not described herein.
The utility model discloses a based on helmholtz principle, on traditional wheel hub's basis, structure anechoic chamber.
As the impeller rotates, the air at the root of the blade produces a periodic vibration, the period of which is synchronized with the rotation of the impeller. The waves generated by this periodic vibration force the air in the muffling chamber to be compressed through the small holes, and accordingly, the air in the muffling chamber moves vibrationally in synchronization. At this time, the air in the sound attenuation chamber acts as an air spring. Because the geometric dimension of each small hole in the silencing cavity is far smaller than the wavelength of sound waves, the kinetic energy of air in the cavity is concentrated in the cavity to move, so that the turbulent kinetic energy of the root of the blade related to the rotation fundamental frequency is absorbed, and the aim of silencing is fulfilled.
The advantage of this embodiment is (1) the impeller is simple in construction, suitable for the daily fan; (2) the impeller is provided with a noise elimination structure on a hub, and turbulent kinetic energy of the root of a blade is absorbed, so that the aim of reducing noise is fulfilled; (3) sound absorption materials can be filled in the silencing cavity to enhance silencing effect; (4) the cover plate and the hub form a cavity, the periphery of the cover plate is connected with the hub in a seamless mode, sound waves are guaranteed to enter the cavity from the small holes and oscillate in the cavity, and the sound waves cannot be transmitted out through a gap between the cover plate and the hub.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A low-noise axial-flow impeller structure with a silencing cavity comprises an impeller body, wherein the impeller body comprises blades and a hub arranged at the center of the impeller body; the method is characterized in that: a noise elimination structure is arranged between the blade and the hub; the silencing structure comprises a base plate integrally formed with the hub, a cover plate is arranged on the upper cover of the base plate, and the cover plate comprises a plate surface with a small hole and cover plate walls at the edges of an inner ring and an outer ring of the plate surface.
2. The low noise axial flow impeller structure with muffling chamber of claim 1 wherein: and the inner surface of the cover plate is provided with a convex column at a position corresponding to the small hole.
3. The low noise axial flow impeller structure with muffling chamber of claim 1 wherein: and the outer side of the silencing structure is provided with an air guide ring, and the cover plate is clamped between the hub and the air guide ring and is assembled with the hub and the air guide ring in a seamless mode.
4. The low noise axial flow impeller structure with muffling chamber of claim 1 wherein: and the bottom plate and the cover plate are provided with positioning connecting structures.
5. The low noise axial flow impeller structure with muffling chamber of claim 2 wherein: the small holes are arranged in a radiation mode from the inner ring to the outer side.
6. The low-noise axial-flow impeller structure with a muffling chamber according to claim 1 or 2, wherein: the diameter of the small holes is 1.6 mm, and the number of the small holes is 150.
7. The low noise axial flow impeller structure with muffling chamber of claim 1 wherein: the cover plate and the bottom plate form a silencing cavity in an enclosing mode, and sound absorption materials are filled in the silencing cavity.
8. The low noise axial flow impeller structure with muffling chamber of claim 1 wherein: the silencing structure is positioned on the air inlet side or the air outlet side or the air inlet side and the air outlet side of the impeller body.
9. The low noise axial flow impeller structure with muffling chamber of claim 3 wherein: the blades are annularly arranged on the outer side of the air guide ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920163595.0U CN210660728U (en) | 2019-01-30 | 2019-01-30 | Low-noise axial-flow impeller structure with muffling cavity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920163595.0U CN210660728U (en) | 2019-01-30 | 2019-01-30 | Low-noise axial-flow impeller structure with muffling cavity |
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| CN210660728U true CN210660728U (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707668A (en) * | 2019-01-30 | 2019-05-03 | 霍通恩 | A kind of low noise aial flow impeller structure with noise elimination cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707668A (en) * | 2019-01-30 | 2019-05-03 | 霍通恩 | A kind of low noise aial flow impeller structure with noise elimination cavity |
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