CN107489646A - Sawtooth pattern noise reduction axial-flow leaf - Google Patents
Sawtooth pattern noise reduction axial-flow leaf Download PDFInfo
- Publication number
- CN107489646A CN107489646A CN201710651530.6A CN201710651530A CN107489646A CN 107489646 A CN107489646 A CN 107489646A CN 201710651530 A CN201710651530 A CN 201710651530A CN 107489646 A CN107489646 A CN 107489646A
- Authority
- CN
- China
- Prior art keywords
- noise reduction
- flow leaf
- pattern noise
- sawtooth pattern
- blade
- 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.)
- Granted
Links
- 230000009467 reduction Effects 0.000 title claims abstract description 45
- 230000000694 effects Effects 0.000 abstract description 4
- 229920003266 Leaf® Polymers 0.000 description 34
- 238000000926 separation method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 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
- 230000008092 positive effect 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
Abstract
The present invention relates to a kind of sawtooth pattern noise reduction axial-flow leaf, including central axle sleeve (1) and the circumferential multiple blades (2) being distributed on central axle sleeve (1) periphery wall, it is characterised in that：It is provided with a gang saw teeth groove (3) at the trailing edge of the blade (2), the width of rebate of at least 1/4 serrated slot (3) and groove depth are equal in all serrated slots (3).It is an advantage of the invention that：Excellent noise reduction effect, it is versatile.
Description
Technical field
The present invention relates to a kind of axial-flow leaf, specifically a kind of sawtooth pattern noise reduction axial-flow leaf.
Background technology
The blade construction of blower fan is an important factor for determining fan noise size.Air-conditioner outdoor unit typically all uses axle stream wind
Leaf, it can produce larger aerodynamic noise when high speed rotates because of reasons such as the disorder of fan blade airflow on surface, the vortex disengagings of fan blade trailing edge,
Influence the aeroperformance of fan blade.Caused noise during to reduce axial-flow leaf operation, the axial-flow leaf of prior art are adopted mostly
With the denoising structure that sawtooth is set in blade trailing edge, patent of invention and application such as Application No. " 201110000018.8 "
Number for " 201210050649.5 " patent of invention individually disclose a kind of blade have no chance provided with broached-tooth design axial-flow leaf, on
Although stating two kinds of axial-flow leafs with certain Noise Reduction, we have found that both not only noise reductions in actual application
Effect and unobvious, and both involved broached-tooth design versatilities are also poor.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of sawtooth pattern noise reduction axial-flow leaf of excellent noise reduction effect.
In order to solve the above technical problems, the invention provides a kind of sawtooth pattern noise reduction axial-flow leaf of following structure：Including
Wheel hub and the circumferential multiple blades being distributed on hub periphery wall, wherein, a gang saw teeth groove is provided with the trailing edge of blade, is owned
The width of rebate of at least 1/4 serrated slot and groove depth are equal in serrated slot.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, all width of rebate and groove depth it is equal serrated slot it is equal
Positioned at the outside of blade.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, all width of rebate and the equal serrated slot of groove depth
Distance of the bottom land at the trailing edge of notch both sides is equal.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, all width of rebate and the equal serrated slot of groove depth
Two side walls are plane.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, all width of rebate and the equal serrated slot of groove depth
Two side walls intersect at bottom land.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, the width of rebate and groove depth of all serrated slots are equal.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, outside, which has, at the trailing edge of blade does not set serrated slot
Reserved portion outside.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, the length L1 in outer reserved portion span is blade
The 1/20~1/10 of whole trailing edge length L.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, inner side, which has, at the trailing edge of blade does not set serrated slot
Interior reserved portion.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, the length L2 in outer reserved portion span is blade
The 1/10~1/5 of whole trailing edge length L.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, all serrated slots are evenly distributed, and each serrated slot
Width of rebate S be：
S=η Dt+γC(ρνd/μ)-0.2
Wherein, DtFor blade trailing edge average thickness；C is axial-flow leaf blade mean chord；ν is the speed of incoming flow of fan blade；d
For fan blade external diameter；μ is the dynamic viscosity of air at normal temperatures, and ρ is the atmospheric density under normal temperature, and η is correction factor, and set t as
Leading edge average thickness/trailing edge average thickness, as t≤3, η span is 0.6~1.5, as t ＞ 3, η span
It is material and windage error coefficient for 1.5~3, γ, its span is 1~12.
Sawtooth pattern noise reduction axial-flow leaf of the present invention, wherein, the opening angle α of serrated slot span for 30~
75 degree.
After said structure, compared with prior art, it is an advantage of the invention that：Sawtooth pattern noise reduction axial-flow leaf of the present invention
The boundary-layer separation that fan blade trailing edge can be effectively reduced comes off, and the separation that be will focus on using sawtooth slot structure at fan blade trailing edge
Whirlpool tinyization, so as to effectively reduce the eddy current crack of fan blade so that the noise reduction of sawtooth pattern noise reduction axial-flow leaf of the present invention
It is greatly improved.
Brief description of the drawings
Fig. 1 is the stereochemical structure appearance schematic diagram of sawtooth pattern noise reduction axial-flow leaf of the present invention.
Embodiment
Sawtooth pattern noise reduction axial-flow leaf of the present invention is made further specifically with reference to the accompanying drawings and detailed description
It is bright.
As shown in figure 1, sawtooth pattern noise reduction axial-flow leaf of the present invention includes wheel hub 1 and is circumferentially distributed on the periphery wall of wheel hub 1
Multiple blades 2, be provided with a gang saw teeth groove 3 at the trailing edge of blade 2, at least 1/4 serrated slot 3 in all serrated slots 3
Width of rebate and groove depth are equal, and all width of rebate and the equal serrated slot 3 of groove depth are respectively positioned on the outside of blade 2, so can
Collecting for making to be vortexed at the trailing edge of blade 2 is further alleviated, so that noise is further improved；All width of rebate
And distance of the bottom land of the equal serrated slot 3 of groove depth at the trailing edge of notch both sides is equal, can so make to be vortexed at the trailing edge of blade 2
Collect and further alleviated so that noise is further improved；All width of rebate and the equal sawtooth of groove depth
Two side walls of groove 3 are plane, and collecting for can so making to be vortexed at the trailing edge of blade 2 is further alleviated, so that
Noise is further improved；Two side walls of all width of rebate and the equal serrated slot 3 of groove depth intersect at bottom land, so
Collecting for can making to be vortexed at the trailing edge of blade 2 is further alleviated, so that noise is further improved；In this implementation
In example, the width of rebate and groove depth of preferably all serrated slots 3 are equal, can so make what is be vortexed at the trailing edge of blade 2 to collect to obtain
Further alleviate, so that noise is further improved；Outside, which has, at the trailing edge of blade 2 does not set the outer pre- of serrated slot 3
Portion 4 is stayed, the length L1 in outer reserved portion 4 span is the 1/20~1/10, preferably 1/20 of the whole trailing edge length L of blade 2,
Inner side has the interior reserved portion 5 for not setting serrated slot 3 at the trailing edge of blade 2, and the length L2 in outer reserved portion 4 span is blade
The 1/10~1/5, preferably 1/10 of 2 whole trailing edge length L, set the purpose in outer reserved portion 4 and interior reserved portion 5 to be for the ease of
The design of serrated slot 3, serrated slot 3 is avoided the changeover portion of the trailing edge both sides of blade 2, make the notch of all serrated slots 3 of guarantee
Width and groove depth are equal, and because closer to 2 cylindrical side of blade, the noise reduction of serrated slot 3 is more obvious, therefore is ensureing own
On the basis of the width of rebate and groove depth of serrated slot 3 are equal, the length in outer reserved portion 4 should be as far as possible small, and the size in interior reserved portion 5
Length that then can be suitably than outer reserved portion 4 is long；All serrated slots 3 are evenly distributed, and the width of rebate S of each serrated slot 3
For：
S=η Dt+γC(ρνd/μ)-0.2
Wherein, DtFor blade trailing edge average thickness；C is axial-flow leaf blade mean chord；ν is the speed of incoming flow of fan blade
(can be measured with experiment)；D is fan blade external diameter；μ is the dynamic viscosity of air at normal temperatures, and ρ is the atmospheric density under normal temperature, η
For correction factor, and t is set as leading edge average thickness/trailing edge average thickness, as t≤3, η span is 0.6~1.5, when
During t ＞ 3, η span is that 1.5~3, γ is material and windage error coefficient, and its span is 1~12, and following table is enumerated
η value, specific tables of data are as follows during some changes with t and γ：
The notch S of each serrated slot 3 is calculated using above-mentioned formula, can have outstanding noise reduction ensureing axial-flow leaf
On the basis of effect so that the versatility of the structure of serrated slot 3 is more preferable, designer is quickly and easily obtained different chis
The width of rebate size of serrated slot 3 used needed for the axial-flow leaf of very little structure, consequently facilitating the design and manufacture of axial-flow leaf；Saw
The opening angle α of teeth groove 3 span be 30~75 degree, preferably 45 degree, by the opening angle α of serrated slot 3 value model
Enclose and be arranged on 30~75 degree of noise reductions that sawtooth pattern noise reduction axial-flow leaf of the present invention can further be effectively ensured, through overtesting
Checking, sawtooth pattern noise reduction axial-flow leaf of the present invention can effectively alleviate vortex compared with same specification but without adenticulate axial-flow leaf
Noise, average noise reduction is up to 3.47dB, positive effect.
Embodiment above is only that the preferred embodiment of the present invention is described, and not the scope of the present invention is entered
Row limits, and on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art make to technical scheme
The various modifications gone out and improvement, it all should fall into the protection domain of claims of the present invention determination.
Claims (12)
1. a kind of sawtooth pattern noise reduction axial-flow leaf, including wheel hub (1) and the circumferential multiple blades being distributed on wheel hub (1) periphery wall
(2), it is characterised in that：It is provided with a gang saw teeth groove (3) at the trailing edge of the blade (2), in all serrated slots (3) at least
There are width of rebate and the groove depth of 1/4 serrated slot (3) equal.
2. sawtooth pattern noise reduction axial-flow leaf according to claim 1, it is characterised in that：All width of rebate and groove depth
Equal serrated slot (3) is respectively positioned on the outside of blade (2).
3. sawtooth pattern noise reduction axial-flow leaf according to claim 2, it is characterised in that：All width of rebate and groove depth
Distance of the bottom land of equal serrated slot (3) at the trailing edge of notch both sides is equal.
4. sawtooth pattern noise reduction axial-flow leaf according to claim 3, it is characterised in that：All width of rebate and groove depth
Two side walls of equal serrated slot (3) are plane.
5. sawtooth pattern noise reduction axial-flow leaf according to claim 4, it is characterised in that：All width of rebate and groove depth
Two side walls of equal serrated slot (3) intersect at bottom land.
6. sawtooth pattern noise reduction axial-flow leaf according to claim 5, it is characterised in that：The groove of all serrated slots (3)
Mouth width and groove depth are equal.
7. sawtooth pattern noise reduction axial-flow leaf according to claim 6, it is characterised in that：Outside at the trailing edge of the blade (2)
Side has the outer reserved portion (4) for not setting serrated slot (3).
8. sawtooth pattern noise reduction axial-flow leaf according to claim 7, it is characterised in that：The length of the outer reserved portion (4)
L1 span is the 1/20~1/10 of the whole trailing edge length L of blade (2).
9. sawtooth pattern noise reduction axial-flow leaf according to claim 6, it is characterised in that：In at the trailing edge of the blade (2)
Side has the interior reserved portion (5) for not setting serrated slot (3).
10. sawtooth pattern noise reduction axial-flow leaf according to claim 9, it is characterised in that：The length of the outer reserved portion (4)
L2 span is the 1/10~1/5 of the whole trailing edge length L of blade (2).
11. according to any described sawtooth pattern noise reduction axial-flow leaf of claim 6~10, it is characterised in that：All sawtooth
Groove (3) is evenly distributed, and the width of rebate S of each serrated slot (3) is：
S=η Dt+γC(ρνd/μ)-0.2
Wherein, DtFor blade trailing edge average thickness；C is axial-flow leaf blade mean chord；ν is the speed of incoming flow of fan blade；D is wind
Leaf external diameter；μ is the dynamic viscosity of air at normal temperatures, and ρ is the atmospheric density under normal temperature, and η is correction factor, and sets t as leading edge
Average thickness/trailing edge average thickness, as t≤3, η span is 0.6~1.5, and as t ＞ 3, η span is
1.5~3, γ are material and windage error coefficient, and its span is 1~12.
12. according to any described sawtooth pattern noise reduction axial-flow leaf of claim 6~10, it is characterised in that：The serrated slot (3)
Opening angle α span be 30~75 degree.
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 true CN107489646A (en) | 2017-12-19 |
| CN107489646B CN107489646B (en) | 2024-01-12 |
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| 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 |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2019153536A1 (en) * | 2018-02-07 | 2019-08-15 | 广东美的制冷设备有限公司 | Axial flow wind rotor and air conditioner |
| 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 |
| EP3882470A4 (en) * | 2018-11-22 | 2022-02-23 | GD Midea Air-Conditioning Equipment Co., Ltd. | Axial-flow impeller and air-conditioner having the same |
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| EP3882470A4 (en) * | 2018-11-22 | 2022-02-23 | GD Midea Air-Conditioning Equipment Co., Ltd. | Axial-flow impeller and air-conditioner having the same |
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| Publication number | Publication date |
|---|---|
| CN107489646B (en) | 2024-01-12 |
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