CN114294264A - Mute fan - Google Patents
Mute fan Download PDFInfo
- Publication number
- CN114294264A CN114294264A CN202111632028.3A CN202111632028A CN114294264A CN 114294264 A CN114294264 A CN 114294264A CN 202111632028 A CN202111632028 A CN 202111632028A CN 114294264 A CN114294264 A CN 114294264A
- Authority
- CN
- China
- Prior art keywords
- fan
- blade
- tail edge
- fan blades
- reinforcing ribs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 241000883990 Flabellum Species 0.000 claims description 11
- 238000005728 strengthening Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 abstract description 10
- 230000001965 increasing effect Effects 0.000 abstract description 5
- 230000010349 pulsation Effects 0.000 abstract description 5
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 241000272184 Falconiformes Species 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- OFCNXPDARWKPPY-UHFFFAOYSA-N allopurinol Chemical compound OC1=NC=NC2=C1C=NN2 OFCNXPDARWKPPY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000001968 nicotinic acid Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a silent fan, which comprises a rotating shaft, fan blades, tail edge sawteeth and reinforcing ribs, wherein the rotating shaft comprises a shaft body and a shaft body, the fan blades comprise a plurality of blades, the tail edge sawteeth are arranged on the shaft body, and the tail edge sawteeth comprise a plurality of teeth: the fan blades and the reinforcing ribs are both arranged on the rotating shaft, the fan blades are positioned below the reinforcing ribs, and tail edge sawteeth are arranged at the tail part of one side of each fan blade; the sawtooth structure can change the shedding position of wake vortexes of each section, thereby increasing the distance between vortex centers, inhibiting the disturbance of the shedding vortexes on the wake flow, and further reducing the unsteady pressure pulsation on the surface of the blade and the aerodynamic noise caused by the wake vortexes.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a mute fan.
Background
The fan blade structure is widely applied to many aspects of human life and work, including fans, radiators and the like, but due to the design problem of the blades, noise which is difficult to ignore is generated during high-speed rotation, and meanwhile, the high-speed motor has potential safety hazard during operation.
The noise generated when the fan blades rotate at high speed mainly comes from three aspects: first, the pressure of the air impacting the leading edge of the blade; second, the friction force between the surface of the blade and the air; and thirdly, the air is discretely collided at the trailing edge of the blade through the vortex generated by the blade. Extensive bionics research on hawks has shown that noise reduction can be integrated by improving blade design.
However, most of the current fan blade noise reduction designs are realized by only reducing the rotating speed of the blades, and other noise reduction modes are not emphasized or considered a little.
Disclosure of Invention
The present invention is directed to a silent fan, which solves the above problems.
In order to achieve the purpose, the invention provides the following technical scheme:
a silent fan comprises a rotating shaft, fan blades, tail edge sawteeth and reinforcing ribs: flabellum and strengthening rib all install in the pivot, and the flabellum is located the strengthening rib below, and one side afterbody of flabellum is equipped with the trailing edge sawtooth.
As a further technical scheme of the invention: the width and the length of the fan blade are both larger than the reinforcing ribs.
As a further technical scheme of the invention: the amplitude of the tail edge sawtooth is 10% chord length.
As a further technical scheme of the invention: the number of the fan blades is five.
As a further technical scheme of the invention: five reinforcing ribs are provided.
Compared with the prior art, the invention has the beneficial effects that: the sawtooth structure can change the shedding position of wake vortexes of each section, thereby increasing the distance between vortex centers, inhibiting the disturbance of the shedding vortexes on the wake flow, and further reducing the unsteady pressure pulsation on the surface of the blade and the aerodynamic noise caused by the wake vortexes.
Drawings
FIG. 1 is a front view of a quiet fan;
fig. 2 is a side view of a quiet fan.
In the figure, a rotating shaft-1, fan blades-2, tail edge sawteeth-3 and reinforcing ribs-4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, example 1: a silent fan comprises a rotating shaft 1, fan blades 2, tail edge sawteeth 3 and reinforcing ribs 4: flabellum 2 and strengthening rib 4 are all installed in pivot 1, and flabellum 2 is located strengthening rib 4 below, and the strengthening rib increases the stability when high rotational speed, reduces vibrations, plays the effect of making an uproar of falling, and one side afterbody of flabellum 2 is equipped with trailing edge sawtooth 3. The width and the length of the fan blade 2 are both larger than the reinforcing ribs 4. The blade camber of the fan blade 2 is increased, so that the pressure difference between airfoil surfaces can be enlarged, the obvious lift increasing effect is brought, the aerodynamic performance of the blade is improved, the thickness of the blade is reduced, the thickness of the blade is favorable for lift increasing and drag reducing, and the lift-drag ratio is improved. The trailing edge serrations reduce the frequency of the unstable noise, and the larger the amplitude of the serrations, the lower the frequency of the unstable noise. 5 flabellums are in same water flat line, and such design can make the blade weaken greatly to the cutting of air, and the collision with the air reduces greatly, and like this, the produced noise of air and blade strong collision will weaken greatly, can't hear hardly, and when the high-speed rotation of fan, the blade can be because of being heated and tremble, sends the noise. The mute fan effectively overcomes the defect, and adopts materials with strong heat conduction and heat dissipation performance, so that even if the fan rotates at high speed, the blades of the fan cannot be severely vibrated due to heating. The stable rotation enables the mute performance of the mute fan to be further enhanced.
The amplitude of the sawtooth 3 at the tail edge is 10% chord length, the tail edge of the sawtooth can obviously reduce the noise in a low-frequency range in the airfoil profile, the airfoil noise is mainly dominated by vortex shedding noise caused by a laminar boundary layer in the state, the sawtooth at the tail edge can inhibit the vortex shedding phenomenon caused by the laminar boundary layer, the lift pulsation of the airfoil profile and the surface pressure pulsation near the tail edge are reduced, the low-frequency turbulence pulsation and the vorticity at the tail edge are weakened, the spanwise correlation of the vortex near the tail edge is effectively reduced, and the comprehensive action of the factors reduces the self-noise of the airfoil profile.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a silence fan which characterized in that, includes pivot (1), flabellum (2), trailing edge sawtooth (3) and strengthening rib (4): flabellum (2) and strengthening rib (4) are all installed on pivot (1), and flabellum (2) are located strengthening rib (4) below, and one side afterbody of flabellum (2) is equipped with trailing edge sawtooth (3).
2. A silent fan as claimed in claim 1, characterized in that the width and length of the fan blades (2) are greater than the length of the ribs (4).
3. A silent fan as claimed in claim 1, characterized in that the trailing edge serrations (3) have an amplitude of 10% chord.
4. A silent fan as claimed in claim 1, characterized in that said fan blades (2) are five.
5. A silent fan as claimed in claim 3, wherein said ribs (4) are five.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632028.3A CN114294264A (en) | 2021-12-28 | 2021-12-28 | Mute fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632028.3A CN114294264A (en) | 2021-12-28 | 2021-12-28 | Mute fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114294264A true CN114294264A (en) | 2022-04-08 |
Family
ID=80972013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111632028.3A Pending CN114294264A (en) | 2021-12-28 | 2021-12-28 | Mute fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114294264A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150233345A1 (en) * | 2012-09-24 | 2015-08-20 | Siemens Aktiengesellschaft | Wind turbine blade |
| CN108087308A (en) * | 2017-12-31 | 2018-05-29 | 青岛众力风机有限公司 | A kind of aerofoil fan |
| CN111022371A (en) * | 2019-12-26 | 2020-04-17 | 宁波朗迪叶轮机械有限公司 | Axial flow fan blade and fan with same |
-
2021
- 2021-12-28 CN CN202111632028.3A patent/CN114294264A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150233345A1 (en) * | 2012-09-24 | 2015-08-20 | Siemens Aktiengesellschaft | Wind turbine blade |
| CN108087308A (en) * | 2017-12-31 | 2018-05-29 | 青岛众力风机有限公司 | A kind of aerofoil fan |
| CN111022371A (en) * | 2019-12-26 | 2020-04-17 | 宁波朗迪叶轮机械有限公司 | Axial flow fan blade and fan with same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220408 |
|
| RJ01 | Rejection of invention patent application after publication |