CN107489646B - Sawtooth type noise-reducing axial flow fan blade - Google Patents
Sawtooth type noise-reducing axial flow fan blade Download PDFInfo
- Publication number
- CN107489646B CN107489646B CN201710651530.6A CN201710651530A CN107489646B CN 107489646 B CN107489646 B CN 107489646B CN 201710651530 A CN201710651530 A CN 201710651530A CN 107489646 B CN107489646 B CN 107489646B
- Authority
- CN
- China
- Prior art keywords
- fan blade
- groove
- axial flow
- blade
- sawtooth
- 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.)
- Active
Links
- 230000009467 reduction Effects 0.000 claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
-
- 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
-
- 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
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a sawtooth type noise reduction axial flow fan blade, which comprises a central shaft sleeve (1) and a plurality of blades (2) circumferentially and uniformly distributed on the peripheral wall of the central shaft sleeve (1), and is characterized in that: a row of sawtooth grooves (3) are formed in the tail edge of the blade (2), and the width and the depth of the groove opening of at least 1/4 of the sawtooth grooves (3) in all the sawtooth grooves (3) are equal. The invention has the advantages that: the noise reduction effect is good, and the universality is strong.
Description
Technical Field
The invention relates to an axial flow fan blade, in particular to a sawtooth noise reduction axial flow fan blade.
Background
The blade structure of the fan is an important factor in determining the noise level of the fan. The air conditioner outdoor unit generally adopts axial flow fan blades, and when the air conditioner outdoor unit rotates at high speed, larger pneumatic noise is generated due to the reasons of turbulence of the air flow on the surface of the fan blades, vortex separation of the tail edges of the fan blades and the like, so that the pneumatic performance of the fan blades is affected. In order to reduce noise generated when the axial flow fan blade runs, most of the axial flow fan blades in the prior art adopt a noise reduction structure with sawteeth arranged at the tail edge of the fan blade, for example, the invention patent with application number of 201110000018.8 and the invention patent with application number of 201210050649.5 respectively disclose an axial flow fan blade with a sawteeth structure without a blade edge.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sawtooth type noise reduction axial flow fan blade with good noise reduction effect.
In order to solve the technical problems, the invention provides a sawtooth noise reduction axial flow fan blade with the following structure: the novel hub comprises a hub and a plurality of blades circumferentially and uniformly distributed on the peripheral wall of the hub, wherein a row of saw tooth grooves are formed in the tail edge of each blade, and the width and depth of the notch of at least 1/4 of the saw tooth grooves in all the saw tooth grooves are equal.
The sawtooth type noise reduction axial flow fan blade provided by the invention has the advantages that all the sawtooth grooves with the same width and depth are positioned on the outer side of the fan blade.
The sawtooth type noise reduction axial flow fan blade provided by the invention has the advantages that the distances from the bottoms of all the sawtooth grooves with equal groove widths and groove depths to the tail edges at the two sides of the grooves are equal.
The invention relates to a sawtooth type noise reduction axial flow fan blade, wherein two side walls of a sawtooth groove with equal groove width and groove depth are plane surfaces.
The invention relates to a sawtooth type noise reduction axial flow fan blade, wherein two side walls of a sawtooth groove with equal groove width and groove depth are intersected at the groove bottom.
The sawtooth type noise reduction axial flow fan blade provided by the invention has the advantages that the widths of the notch openings and the depths of the notch grooves are equal.
The invention relates to a sawtooth type noise reduction axial flow fan blade, wherein an outer reserved part without a sawtooth groove is arranged on the outer side of the tail edge of the fan blade.
The invention relates to a sawtooth noise reduction axial flow fan blade, wherein the value range of the length L1 of an outer reserved part is 1/20-1/10 of the length L of the whole tail edge of the blade.
The invention relates to a sawtooth noise reduction axial flow fan blade, wherein an inner reserved part without a sawtooth groove is arranged on the inner side of the tail edge of the fan blade.
The invention relates to a sawtooth noise reduction axial flow fan blade, wherein the value range of the length L2 of an inner reserved part is 1/10-1/5 of the length L of the whole tail edge of the blade.
The invention relates to a sawtooth type noise reduction axial flow fan blade, wherein all sawtooth grooves are uniformly distributed, and the width S of the notch of each sawtooth groove is as follows:
S＝ηD t +γC(ρνd/μ) -0.2
wherein D is t The average thickness of the tail edge of the blade; c is the average chord length of the axial flow fan blade; v is the incoming flow speed of the fan blade; d is the outer diameter of the fan blade; mu is the dynamic viscosity of air at normal temperature, rho is the air density at normal temperature, eta is a correction coefficient, t is the average thickness of the front edge/the average thickness of the tail edge, when t is less than or equal to 3, the value range of eta is 0.6-1.5, when t is more than 3, the value range of eta is 1.5-3, gamma is the material and wind resistance error coefficient, and the value range of eta is 1-12.
The sawtooth type noise reduction axial flow fan blade provided by the invention has the advantages that the value range of the included angle alpha of the opening of the sawtooth groove is 30-75 degrees.
After adopting the structure, compared with the prior art, the invention has the advantages that: the sawtooth type noise reduction axial flow fan blade can effectively reduce separation and falling of the boundary layer at the tail edge of the fan blade, and the separation vortex concentrated at the tail edge of the fan blade is thinned by utilizing the sawtooth groove structure, so that vortex noise of the fan blade is effectively reduced, and the noise reduction effect of the sawtooth type noise reduction axial flow fan blade is greatly improved.
Drawings
Fig. 1 is a schematic view of the perspective structure of the sawtooth noise reduction axial flow fan blade of the invention.
Detailed Description
The sawtooth type noise reduction axial flow fan blade of the invention is further described in detail below with reference to the accompanying drawings and the detailed description.
As shown in FIG. 1, the sawtooth type noise reduction axial flow fan blade comprises a hub 1 and a plurality of blades 2 circumferentially and uniformly distributed on the peripheral wall of the hub 1, wherein a row of sawtooth grooves 3 are formed in the tail edge of each blade 2, the widths and the depths of the notches of at least 1/4 of the sawtooth grooves 3 in all the sawtooth grooves 3 are equal, and the sawtooth grooves 3 with the same widths and the same depths of the notches are positioned on the outer sides of the blades 2, so that the collection of vortex at the tail edge of each blade 2 can be further relieved, and the noise can be further improved; the distances from the bottoms of all the saw tooth grooves 3 with equal groove widths and groove depths to the tail edges on the two sides of the groove openings are equal, so that the collection of vortex at the tail edges of the blades 2 can be further relieved, and the noise is further improved; the two side walls of the saw tooth groove 3 with the same width and depth of the groove are plane, so that the collection of vortex at the tail edge of the blade 2 can be further relieved, and the noise can be further improved; the two side walls of the saw tooth groove 3 with the same width and depth of all the grooves are intersected at the groove bottom, so that the collection of vortex at the tail edge of the blade 2 can be further relieved, and the noise can be further improved; in this embodiment, it is preferable that the slot widths and slot depths of all the saw tooth slots 3 are equal, so that the collection of the vortex at the trailing edge of the blade 2 can be further relieved, and the noise can be further improved; the outer reserved part 4 without the serration groove 3 is arranged on the outer side of the tail edge of the blade 2, the value range of the length L1 of the outer reserved part 4 is 1/20-1/10, preferably 1/20, of the whole tail edge length L of the blade 2, the inner reserved part 5 without the serration groove 3 is arranged on the inner side of the tail edge of the blade 2, the value range of the length L2 of the inner reserved part 5 is 1/10-1/5, preferably 1/10, of the whole tail edge length L of the blade 2, the purpose of arranging the outer reserved part 4 and the inner reserved part 5 is to facilitate the design of the serration groove 3, ensure that the notch width and the notch depth of all the serration grooves 3 are equal, and the noise reduction effect of the serration groove 3 is more obvious because the notch width and the notch depth of all the serration grooves 3 are equal, and the length of the inner reserved part 4 is as small as possible, and the size of the inner reserved part 5 is properly longer than the length of the outer reserved part 4; all the saw tooth grooves 3 are uniformly distributed, and the width S of the notch of each saw tooth groove 3 is as follows:
S＝ηD t +γC(ρνd/μ) -0.2
wherein D is t The average thickness of the tail edge of the blade; c is the average chord length of the axial flow fan blade; v is the incoming flow speed of the fan blade (which can be measured by a test); d is the outer diameter of the fan blade; mu is the dynamic viscosity of air at normal temperatureThe degree, ρ is the air density at normal temperature, η is a correction coefficient, and let t be the leading edge average thickness/trailing edge average thickness, when t is less than or equal to 3, the value range of η is 0.6-1.5, when t is more than 3, the value range of η is 1.5-3, γ is the material and windage error coefficient, the value range of γ is 1-12, the following table lists several values of η with the change of t and γ, the specific data table is as follows:
the notch S of each sawtooth groove 3 is calculated by adopting the formula, so that the universality of the structure of the sawtooth groove 3 is better on the basis of ensuring that the axial flow fan blade has excellent noise reduction effect, and a designer can quickly and conveniently obtain the width dimension of the notch of the sawtooth groove 3 required to be adopted by the axial flow fan blade with different size structures, thereby being convenient for the design and manufacture of the axial flow fan blade; the value range of the included angle alpha of the opening of the sawtooth groove 3 is 30-75 degrees, preferably 45 degrees, the noise reduction effect of the sawtooth type noise reduction axial flow fan blade can be further effectively ensured by setting the value range of the included angle alpha of the opening of the sawtooth groove 3 at 30-75 degrees, and compared with the axial flow fan blade with the same specification but without sawtooth, the sawtooth type noise reduction axial flow fan blade can effectively relieve vortex noise, and the average noise reduction can reach 3.47dB with obvious effect.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. The utility model provides an axial fan blade of making an uproar falls in sawtooth formula, includes wheel hub (1) and circumference equipartition a plurality of blades (2) on wheel hub (1) peripheral wall, its characterized in that: the blade is characterized in that a row of saw tooth grooves (3) are formed in the tail edge of the blade (2), the width and the depth of the groove openings of all the saw tooth grooves (3) are equal, all the saw tooth grooves (3) with equal width and depth of the groove openings are located on the outer side of the blade (2), the distance from the groove bottoms of the saw tooth grooves (3) with equal width and depth of the groove openings to the tail edge of the two sides of the groove openings is equal, the outer reserved portions (4) without the saw tooth grooves (3) are arranged on the outer side of the tail edge of the blade (2), the inner reserved portions (5) without the saw tooth grooves (3) are arranged on the inner side of the tail edge of the blade (2), the saw tooth grooves (3) are evenly distributed, and the width S of the groove openings of each saw tooth groove (3) is:
S＝ηD t +γC(ρνd/μ) -0.2
wherein D is t The average thickness of the tail edge of the blade; c is the average chord length of the axial flow fan blade; v is the incoming flow speed of the fan blade; d is the outer diameter of the fan blade; mu is the dynamic viscosity of air at normal temperature, rho is the air density at normal temperature, eta is a correction coefficient, t is the average thickness of the front edge/the average thickness of the tail edge, when t is less than or equal to 3, the value range of eta is 0.6-1.5, when t is more than 3, the value range of eta is 1.5-3, gamma is the material and wind resistance error coefficient, and the value range of eta is 1-12.
2. The zigzag noise-reducing axial flow fan blade according to claim 1, wherein: and the two side walls of the sawtooth groove (3) with the same width and depth of the groove opening are plane.
3. The zigzag noise-reducing axial flow fan blade according to claim 2, wherein: the two side walls of the sawtooth groove (3) with the same width and depth of the groove are intersected at the groove bottom.
4. The zigzag noise-reducing axial flow fan blade according to claim 1, wherein: the value range of the length L1 of the outer reserved part (4) is 1/20-1/10 of the length L of the whole tail edge of the blade (2).
5. The zigzag noise-reducing axial flow fan blade according to claim 1, wherein: the value range of the length L2 of the inner reserved part (5) is 1/10-1/5 of the length L of the whole tail edge of the blade (2).
6. The sawtooth noise reduction axial flow fan blade according to any one of claims 3 to 5, wherein: the value range of the opening included angle alpha of the sawtooth groove (3) is 30-75 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710651530.6A CN107489646B (en) | 2017-08-02 | 2017-08-02 | Sawtooth type noise-reducing axial flow fan blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710651530.6A CN107489646B (en) | 2017-08-02 | 2017-08-02 | Sawtooth type noise-reducing axial flow fan blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107489646A CN107489646A (en) | 2017-12-19 |
| CN107489646B true CN107489646B (en) | 2024-01-12 |
Family
ID=60645111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710651530.6A Active CN107489646B (en) | 2017-08-02 | 2017-08-02 | Sawtooth type noise-reducing axial flow fan blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107489646B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118194B (en) | 2018-02-07 | 2024-05-28 | 广东美的制冷设备有限公司 | Axial flow wind wheel and air conditioner |
| WO2020103400A1 (en) * | 2018-11-22 | 2020-05-28 | 广东美的制冷设备有限公司 | Axial-flow wind wheel and air-conditioner with same |
| CN109895983A (en) * | 2019-03-20 | 2019-06-18 | 西北工业大学 | A kind of sawtooth trailing edge denoising structure suitable for ducted propeller |
| CN110410879A (en) * | 2019-08-29 | 2019-11-05 | 代元军 | A kind of blade tip is in the air-conditioner outdoor unit of W type structure |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789883A (en) * | 1954-08-20 | 1958-01-29 | Power Jets Res & Dev Ltd | High speed aerofoil |
| CN1128327A (en) * | 1994-11-08 | 1996-08-07 | 三菱重工业株式会社 | Propeller fan |
| JP2001073995A (en) * | 1999-09-03 | 2001-03-21 | Daikin Ind Ltd | Impeller for blower |
| EP2418389A2 (en) * | 2010-08-13 | 2012-02-15 | Ziehl-Abegg AG | Impeller for a ventilator |
| EP2466150A2 (en) * | 2010-12-20 | 2012-06-20 | Ziehl-Abegg AG | Impeller for a ventilator and method for manufacturing such an impeller |
| CN102588339A (en) * | 2012-03-01 | 2012-07-18 | Tcl空调器(中山)有限公司 | Fan structure and axial fan |
| CN104314869A (en) * | 2014-10-22 | 2015-01-28 | 深圳市南方格瑞斯科技有限公司 | Structure-improved respirator motor impeller |
| CN204344525U (en) * | 2014-06-30 | 2015-05-20 | 珠海格力电器股份有限公司 | Axial flow fan blade, axial flow fan and air conditioner |
| CN204755393U (en) * | 2015-07-07 | 2015-11-11 | 珠海格力电器股份有限公司 | centrifugal impeller and air conditioner |
| CN105275877A (en) * | 2015-10-26 | 2016-01-27 | 杭州微光电子股份有限公司 | Impeller structure of axial flow fan |
| CN105804955A (en) * | 2016-03-11 | 2016-07-27 | 北京金风科创风电设备有限公司 | Blade for wind generating set and wind generating set |
| CN106545521A (en) * | 2017-01-16 | 2017-03-29 | 江苏汇创机电科技股份有限公司 | A kind of brshless DC motor noise reduction impeller |
| CN207333287U (en) * | 2017-08-02 | 2018-05-08 | 奥克斯空调股份有限公司 | Sawtooth pattern noise reduction axial-flow leaf |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5353994B2 (en) * | 2011-11-21 | 2013-11-27 | ダイキン工業株式会社 | Axial fan |
-
2017
- 2017-08-02 CN CN201710651530.6A patent/CN107489646B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789883A (en) * | 1954-08-20 | 1958-01-29 | Power Jets Res & Dev Ltd | High speed aerofoil |
| CN1128327A (en) * | 1994-11-08 | 1996-08-07 | 三菱重工业株式会社 | Propeller fan |
| JP2001073995A (en) * | 1999-09-03 | 2001-03-21 | Daikin Ind Ltd | Impeller for blower |
| EP2418389A2 (en) * | 2010-08-13 | 2012-02-15 | Ziehl-Abegg AG | Impeller for a ventilator |
| EP2466150A2 (en) * | 2010-12-20 | 2012-06-20 | Ziehl-Abegg AG | Impeller for a ventilator and method for manufacturing such an impeller |
| CN102588339A (en) * | 2012-03-01 | 2012-07-18 | Tcl空调器(中山)有限公司 | Fan structure and axial fan |
| CN204344525U (en) * | 2014-06-30 | 2015-05-20 | 珠海格力电器股份有限公司 | Axial flow fan blade, axial flow fan and air conditioner |
| CN104314869A (en) * | 2014-10-22 | 2015-01-28 | 深圳市南方格瑞斯科技有限公司 | Structure-improved respirator motor impeller |
| CN204755393U (en) * | 2015-07-07 | 2015-11-11 | 珠海格力电器股份有限公司 | centrifugal impeller and air conditioner |
| CN105275877A (en) * | 2015-10-26 | 2016-01-27 | 杭州微光电子股份有限公司 | Impeller structure of axial flow fan |
| CN105804955A (en) * | 2016-03-11 | 2016-07-27 | 北京金风科创风电设备有限公司 | Blade for wind generating set and wind generating set |
| CN106545521A (en) * | 2017-01-16 | 2017-03-29 | 江苏汇创机电科技股份有限公司 | A kind of brshless DC motor noise reduction impeller |
| CN207333287U (en) * | 2017-08-02 | 2018-05-08 | 奥克斯空调股份有限公司 | Sawtooth pattern noise reduction axial-flow leaf |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107489646A (en) | 2017-12-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107489646B (en) | Sawtooth type noise-reducing axial flow fan blade | |
| US5437541A (en) | Blade for axial fan | |
| US4063852A (en) | Axial flow impeller with improved blade shape | |
| CN101535657B (en) | Axial fan assembly and axial fan | |
| US20180066521A1 (en) | Axial fan and outdoor unit | |
| US20190293091A1 (en) | Propeller fan, air-conditioning apparatus and ventilator | |
| CN110645140B (en) | Aerodynamic structure | |
| EP2336576A2 (en) | Counter-rotating axial flow fan | |
| BR102013025213A2 (en) | WIND TURBINE ROTOR BLADE, WIND TURBINE WITH NUMBER ROTOR BLADES AND AIRFLOW CORRECTION PROVISION | |
| CA2700517A1 (en) | Airfoil diffuser for a centrifugal compressor | |
| WO2019153536A1 (en) | Axial flow wind rotor and air conditioner | |
| US8105027B2 (en) | Housing for axial-flow fan | |
| JP5425192B2 (en) | Propeller fan | |
| CN207333287U (en) | Sawtooth pattern noise reduction axial-flow leaf | |
| EP1455095B1 (en) | Axial-flow fan | |
| KR101881288B1 (en) | Biomimetic type blower impeller | |
| JP4208020B2 (en) | Multi-blade fan impeller | |
| CN205331055U (en) | A impeller for fan | |
| CN203476794U (en) | Impeller structure of centrifugal fan | |
| JP2012107538A (en) | Axial-flow fan or diagonal-flow fan, and air conditioner mounted outdoor unit with the same | |
| JPH0121198Y2 (en) | ||
| KR101852572B1 (en) | Axial Fan | |
| CN215409414U (en) | Axial flow fan blade | |
| BR112018011610B1 (en) | GYROSCOPE ROTOR PADDLE | |
| JPS59105998A (en) | Axial flow fan |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |