CN210715260U - Axial compressor duct flabellum of making an uproar falls - Google Patents
Axial compressor duct flabellum of making an uproar falls Download PDFInfo
- Publication number
- CN210715260U CN210715260U CN201921159894.3U CN201921159894U CN210715260U CN 210715260 U CN210715260 U CN 210715260U CN 201921159894 U CN201921159894 U CN 201921159894U CN 210715260 U CN210715260 U CN 210715260U
- Authority
- CN
- China
- Prior art keywords
- blade
- noise
- axial flow
- fan blade
- guiding grooves
- 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.)
- Expired - Fee Related
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/682—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid extraction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a noise reduction axial flow duct fan blade, which comprises a hub and a plurality of blades annularly arranged on the outer peripheral surface of the hub, wherein the cross section of each blade is in a plano-convex wing shape, the tip end part of each blade is provided with a winglet, and the cross section area of the winglet is larger than that of the tip end part of each blade; a plurality of pressure relief holes are formed in the blade tips of the blades; the wind guiding side of the blade is provided with a plurality of wind guiding grooves near the tip of the blade, and convex sawteeth extend outwards from convex edges between adjacent wind guiding grooves of the blade. The utility model discloses an improve the blade configuration, reduced the noise of axial compressor duct flabellum by a wide margin.
Description
Technical Field
The utility model particularly relates to an axial compressor duct flabellum of making an uproar falls.
Background
The axial flow duct fan blade is a mainstream fan blade with high reliability and wide universality in the existing unmanned aerial vehicle, the lift force structure and flight stability of the axial flow duct fan blade are very excellent, but large aerodynamic noise and squealing sound can be generated in the flight process, the sharp squealing sound is found to be caused by airflow disturbance generated by blade tip vortex shedding and airflow pressure mutation of a wind-receiving surface and a leeward surface through fluid noise source analysis and combination of a prototype noise source test, and the sharp squealing sound can generate noise pollution and expose the position of the unmanned aerial vehicle, so that the competitiveness of a product is reduced; therefore, the noise-reducing axial flow duct fan blade is designed aiming at the sharp squeaking sound.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects of the prior art, and providing the noise reduction axial flow duct fan blade.
The noise-reducing axial flow duct fan blade is characterized by comprising a hub and a plurality of blades annularly arranged on the peripheral surface of the hub, wherein the cross section of each blade is in a plano-convex wing shape, the tip end part of each blade is provided with a winglet, and the cross section area of the winglet is larger than that of the tip end part; a plurality of pressure relief holes are formed in the blade tips of the blades; the wind guiding side of the blade is provided with a plurality of wind guiding grooves near the tip of the blade, and convex sawteeth extend outwards from convex edges between adjacent wind guiding grooves of the blade.
Preferably, the air guide grooves are distributed in a ripple shape along the radial direction of the blade, and the width of the convex ridge between adjacent air guide grooves gradually increases along the extending direction of the blade.
Specifically, the air guide groove is arc-shaped.
Specifically, the shape of one side of the convex sawteeth close to the blade root is the same as the radian of the corresponding air guide groove.
Preferably, the number of the pressure relief holes is 3-5, the diameter of the pressure relief holes is 1-5 mm, and the distance between the pressure relief holes and the tip end of the blade is less than 1-5 mm.
Preferably, the number of the fan blades is 3-24 and is an integer of 3 or 4.
Preferably, the hub ratio of the fan blades is 0.3-0.7.
Has the advantages that: when blades of the axial flow duct fan blade run, the pressure intensity of a pressure surface is higher than that of a suction surface, under the action of pressure intensity difference, airflow of the pressure surface bypasses a blade tip and flows to the suction surface, so that the streamline of the pressure surface inclines from the blade root to the blade tip, the streamline of the suction surface deviates from the blade tip to the blade root, and blade tip vortex is formed at the blade tip due to the fact that the airflow of the pressure surface and the airflow of the suction surface have different flow directions at the rear edge, blade tip noise is caused, and the working efficiency of the fan blade is reduced.
Therefore, the utility model increases the winglet on the blade tip to improve the overall efficiency and performance of the blade; the utility model reduces the sudden change of the airflow pressure of the wind-receiving surface and the lee surface by punching the surface of the blade, thereby reducing the noise radiation; the utility model discloses an offer the wind-guiding groove on the flabellum surface, push into the wind-guiding groove after protrusion sawtooth is split with the air, and then reduce resistance, noise reduction.
Drawings
FIG. 1 is a front view of a noise reducing axial flow ducted fan blade;
FIG. 2 is a perspective view of a noise-reducing axial flow duct fan blade;
in the figure: 1. the blade comprises a hub, 2 parts of blades, 3 parts of winglets, 4 parts of pressure relief holes, 5 parts of air guide grooves, 6 parts of ribs, 7 parts of protruding sawteeth.
Detailed Description
In order to deepen the understanding of the present invention, the present invention will be further described in detail with reference to the following embodiments and the attached drawings, and the embodiments are only used for explaining the present invention, and do not constitute the limitation to the protection scope of the present invention.
As shown in fig. 1-2, the noise-reducing axial flow duct fan blade is characterized by comprising a hub 1 and a plurality of blades 2 annularly arranged on the outer peripheral surface of the hub, wherein the cross section of each blade is in a plano-convex wing shape, the tip end part of each blade is provided with a winglet 3, and the cross section area of the winglet 3 is larger than that of the tip end part; a plurality of pressure relief holes 4 are formed in the blade tips of the blades; the wind-guiding side of each blade is provided with a plurality of wind-guiding grooves 5 near the tip of the blade, and convex sawteeth 7 extend outwards from convex edges 6 between adjacent wind-guiding grooves 5 of the blades.
The air guide grooves 5 are distributed in a ripple shape along the radial direction of the blade 2, and the width of the convex ridge 6 between the adjacent air guide grooves 5 is gradually increased along the extending direction of the blade; the air guide groove 5 is arc-shaped; the shape of one side of the convex sawteeth 7 close to the blade root is the same as the radian of the corresponding air guide groove 5.
The number of the pressure relief holes 4 is 3-5, the diameter is 1-5 mm, and the distance between the pressure relief holes 4 and the tip end of the blade is less than 1-5 mm.
The number of the fan blades is 3-24 and is an integer of 3 or 4.
The hub ratio of the fan blades is 0.3 to 0.7.
Through test comparison, when the noise reduction axial flow duct fan blade in the embodiment operates, the noise is reduced by 2-4 decibels integrally, and the howling sound is reduced by 5-9 decibels.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The noise-reducing axial flow duct fan blade is characterized by comprising a hub and a plurality of blades annularly arranged on the peripheral surface of the hub, wherein the cross section of each blade is in a plano-convex wing shape, the tip end part of each blade is provided with a winglet, and the cross section area of the winglet is larger than that of the tip end part; a plurality of pressure relief holes are formed in the blade tips of the blades; the wind guiding side of the blade is provided with a plurality of wind guiding grooves near the tip of the blade, and convex sawteeth extend outwards from convex edges between adjacent wind guiding grooves of the blade.
2. The noise-reducing axial flow ducted fan blade according to claim 1, wherein the air guiding grooves are radially distributed in a ripple shape along the blade, and the width of the ridge between adjacent air guiding grooves gradually increases along the extending direction of the blade.
3. The noise reducing axial flow ducted fan blade as claimed in claim 2, wherein the air guiding grooves are arc-shaped.
4. The noise-reducing axial flow ducted fan blade as claimed in claim 3, wherein the convex serrations have the same profile as the corresponding air guiding grooves at the side near the blade root.
5. The noise-reducing axial flow ducted fan blade according to claim 1, wherein the number of the pressure-releasing holes is 3 to 5.
6. The noise-reducing axial flow duct fan blade according to claim 1, wherein the diameter of the pressure relief hole is 1-5 mm, and the distance between the pressure relief hole and the tip end of the blade is less than 1-5 mm.
7. The noise-reducing axial flow ducted fan blade according to claim 1, wherein the number of the fan blades is 3 to 24 and is an integer of 3 or 4.
8. The noise reducing axial flow ducted fan blade as claimed in claim 1, wherein the hub ratio of the fan blade is 0.3 to 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921159894.3U CN210715260U (en) | 2019-07-23 | 2019-07-23 | Axial compressor duct flabellum of making an uproar falls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921159894.3U CN210715260U (en) | 2019-07-23 | 2019-07-23 | Axial compressor duct flabellum of making an uproar falls |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210715260U true CN210715260U (en) | 2020-06-09 |
Family
ID=70928726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921159894.3U Expired - Fee Related CN210715260U (en) | 2019-07-23 | 2019-07-23 | Axial compressor duct flabellum of making an uproar falls |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210715260U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11808282B1 (en) | 2022-03-02 | 2023-11-07 | Aaon, Inc. | Propeller fan assembly with silencer seeds and concentric hub and method of use |
-
2019
- 2019-07-23 CN CN201921159894.3U patent/CN210715260U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11808282B1 (en) | 2022-03-02 | 2023-11-07 | Aaon, Inc. | Propeller fan assembly with silencer seeds and concentric hub and method of use |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200609 Termination date: 20210723 |