CN108167224A - It is a kind of that the blade of multilayer denoising structure and the fan including the blade are set - Google Patents
It is a kind of that the blade of multilayer denoising structure and the fan including the blade are set Download PDFInfo
- Publication number
- CN108167224A CN108167224A CN201711441968.8A CN201711441968A CN108167224A CN 108167224 A CN108167224 A CN 108167224A CN 201711441968 A CN201711441968 A CN 201711441968A CN 108167224 A CN108167224 A CN 108167224A
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- China
- Prior art keywords
- blade
- denoising structure
- multilayer
- denoising
- suction surface
- 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.)
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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
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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
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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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
- F04D29/661—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/306—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the suction side of a rotor blade
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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 invention discloses a kind of blade for setting multilayer denoising structure, multilayer denoising structure is set on the suction surface of the blade, the quantity of the denoising structure is at least two layers.Denoising structure described in multilayer is arranged at intervals successively along trailing edge to blade inlet edge, the denoising structure being arranged on the trailing edge position is rear denoising structure, remaining the described denoising structure being arranged on the suction surface is suction surface denoising structure, and the suction surface denoising structure includes at least one layer of denoising structure.The denoising structure is broached-tooth design or comb shaped structure, and the broached-tooth design is arcuate corrugation sawtooth or triangular sawtooth.Due to being provided with sawtooth convex surface in the denoising structure in the fan blade of the present invention, there is the effect of conflux on sawtooth convex surface, and when air-flow flows through serrated face, air-flow can collect to sawtooth convex surface, the vortex separation on the suction surface of fan blade is effectively reduced, reduces fan wideband eddy current crack.
Description
Technical field
The present invention relates to fan apparatus fields, and in particular to a kind of to set the blade of multilayer denoising structure and including the blade
Fan.
Background technology
At present, fan is the essential component part of the industries such as refrigeration or ventilation, during fan work, gas
Stream can be flowed along the suction surface and pressure face of fan blade, in the rear outlet air of blade, generate air-flow separation, and air-flow is along fan
The suction surface flow rate of blade is higher than the rate on pressure face.Since the suction surface of fan blade is there are friction layer,
And as fan swirling eddy boundary-layer constantly comes off from fan blade rear, a large amount of air-flow whirlpool is generated, and then increase
The eddy current crack of fan.Jagged structure on the rear of fan blade is set in the prior art, air-flow is made to flow through serrated face
When, air-flow can collect to sawtooth convex surface, reduce the vortex separation on the suction surface of fan blade, reduce fan wideband vortex and make an uproar
Sound.But the effect that this structure reduces noise is low, when fan blade rotating speed is larger, since air quantity increases, on trailing edge
Laciniation reduces the effect of the vortex separation on the suction surface of fan blade, can not meet the noise reduction of fan.
Application No. is the 200820162494.3 patent fan blade of wind turbine " be used for ", the patent include blade and with electricity
The wheel that the output shaft of machine is connected is firm, and fairshaped wing flap is provided on the blade positioned at exterior string position, the wing flap from
5 one 10% position that blade tip extends into outer chord length starts to extend to the rear end of exterior string, and the rear of every blade uses energy
Reduce the zigzag of Rotation Noise.The broached-tooth design set on trailing edge, the vortex that can be effectively reduced at blade exit
Stream loss, enable reasonably to avoid surge area during operation, improve the aerodynamic quality of blade, make impeller rotation when noise more
It is low.But it cannot solve the problems, such as to generate mass air flow whirlpool when air quantity is excessive at trailing edge.
Application No. is a kind of patent " mute structure of fan blade " of CN201520586783.6, by fan blade
Leeward lateral edge portion bond sawtooth stick, the sawtooth of sawtooth stick generates vortex when fan rotates, is vortexed in intersection's phase
It mutually offsets, so as to reduce noise.Although the technology in the patent can also play the Noise Reduction of fan assembly, the saw of setting
Tooth stick is fixed in fan blade by cohesive mode, is easily come off, and cannot solve air quantity it is excessive when air-flow
The problem of whirlpool is excessive makes noise reduction be affected.
Invention content
In order to solve the above technical problem, the present invention provides a kind of blade for setting multilayer denoising structure, in fan leaf
At least more than two layers denoising structure is designed on the suction surface of piece, since there is the effect of conflux on the sawtooth convex surface on denoising structure, when
When air-flow flows through serrated face, air-flow can collect to sawtooth convex surface, effectively reduce the vortex separation on the suction surface of fan blade, drop
Low fan wideband eddy current crack.
For achieving the above object, the technical solution that the present invention takes is as follows：
A kind of blade for setting multilayer denoising structure, multilayer denoising structure, the drop are set on the suction surface of the blade
The quantity for structure of making an uproar is at least two layers.When air-flow flows through the suction surface of fan blade, due to being deposited on the suction surface of fan blade
Multilayer denoising structure can advance/retard friction layer air-flow separation, reduce fan wideband eddy current crack.
Preferably, denoising structure described in multilayer is arranged at intervals successively along trailing edge to blade inlet edge, is arranged on the leaf
The denoising structure on piece posterior border position is rear denoising structure, remaining the described denoising structure being arranged on the suction surface
For suction surface denoising structure, the suction surface denoising structure includes at least one layer of denoising structure.
Preferably, every layer of denoising structure extends to blade tip from blade root.
Preferably, the rear denoising structure is penetrated from the suction surface to pressure face at the trailing edge, described
Suction surface denoising structure is not penetrated from the suction surface to pressure face, and the suction surface denoising structure is in the suction surface of the blade
The direction extension of the upper trailing edge.The suction surface denoising structure does not penetrate the blade to postpone convenient for more preferable air-flow
Air-flow detaches.
Preferably, the denoising structure is broached-tooth design or comb shaped structure, the broached-tooth design for arcuate corrugation sawtooth or
Triangular sawtooth.It is both provided with concave and convex surface on comb shaped structure and broached-tooth design, the sawtooth on broached-tooth design is convex surface, tooth socket
For concave surface, the string configuration on comb shaped structure is convex surface, and concave surface is provided between two neighboring string configuration.
Preferably, the denoising structure is one kind in rectangular preiection structure or trapezoidal bulge-structure.
Preferably, the male and fomale(M＆F) on the denoising structure of adjacent two layers corresponds, described in front layer on denoising structure
Concave surface or convex surface are corresponded with the concave surface on the rear layer denoising structure or convex surface.If the concave surface of denoising structure described in front layer with
The convex surface of the layer denoising structure corresponds to afterwards, can destroy the effect of convex surface conflux, friction layer is made to detach in advance, increases fan
Eddy current crack.
Preferably, the fan blade thickness H of the sawtooth thickness h on the rear denoising structure and sawtooth position corresponding position
Between relationship be：0.1H≤h≤0.5H.The too small effect for not having conflux of sawtooth thickness, sawtooth thickness, which crosses conference, leads to fan
Trailing edge insufficient strength, deformable blade when causing the fan to rotate.
Preferably, between denoising structure described in adjacent two layers denoising structure described in spacing distance a and multilayer width summation A
Between relationship be：0<a≤0.2A.
The present invention also provides a kind of fan, the fan includes fan hub and motor, further includes multiple above-mentioned leaves
Piece, the blade are mounted in the fan hub.
Relative to the prior art, the present invention achieves beneficial technique effect：
For the present invention by setting multilayer denoising structure on the suction surface of fan blade, the quantity of denoising structure is at least two
Layer.When air-flow flows through the suction surface of fan blade, pass through the noise reduction for setting multilayer denoising structure that can make air-flow in different layers
It generates air-flow in structure to collect, the separation of advance/retard friction layer air-flow reduces fan wideband eddy current crack.Adjacent two layers
Denoising structure on male and fomale(M＆F) correspond, the concave surface on the concave surface or convex surface on front layer denoising structure and rear layer denoising structure
Or convex surface corresponds, such setting is that the concave surface of front layer denoising structure is corresponding with the convex surface of rear layer denoising structure in order to prevent
Afterwards, the effect of convex surface conflux is destroyed, friction layer is made to detach in advance, increases fan eddy current crack.Due to rear denoising structure
It is the place that air-flow finally converges in fan blade, sawtooth thickness h and sawtooth position corresponding position on rear denoising structure
Fan blade thickness H between relationship be：0.1H≤h≤0.5H, it can be ensured that sawtooth has optimal thickness, prevents saw
When transverse tooth thickness spends the small effect for not having conflux and sawtooth thickness crosses conference and leads to fan blade rear insufficient strength, fan rotation
The problem of deformable blade.Denoising structure is broached-tooth design or comb shaped structure, due to being both provided on broached-tooth design and comb shaped structure
Convex surface and concave surface, there is the effect of conflux on convex surface in fan blade rotation process, and when air-flow flows through serrated face, air-flow can be to saw
Tooth convex surface is collected, and effectively reduces the vortex separation on the suction surface of fan blade, reduces fan wideband eddy current crack.
Description of the drawings
The positive diagram that Fig. 1 is blade of the present invention and fan hub is assembled；
The side view that Fig. 2 is blade of the present invention and fan hub is assembled；
Fig. 3 is the front view of blade of the present invention；
Fig. 4 is the side view of blade of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments to the present invention
It is further elaborated, but the scope of protection of present invention is not limited to following specific embodiments.
As illustrated in fig. 1 and 2, in the first embodiment of the present invention, a kind of blade 1 for setting multilayer denoising structure, blade 1 wraps
Suction surface 13 and pressure face 14 are included, during fan rotates, air-flow can be along the suction surface 13 and pressure face of fan blade 1
14 flowings in the rear outlet air of blade 1, generate air-flow separation, and air-flow is higher than along 13 flow rate of suction surface of fan blade
Rate on pressure face 14, therefore when air-flow flows through the suction surface 13 of fan blade, gas is generated on the suction surface 13 of blade
Boundary-layer is flowed, and as fan swirling eddy boundary-layer constantly comes off from 1 rear of fan blade, generates a large amount of air-flow
Whirlpool.The suction surface 13 of the blade of the present invention is the front of blade 1, and the pressure face 14 of blade is the back side of blade 1, by blade
Suction surface 13 on setting multilayer denoising structure 4, the quantity of denoising structure 4 is at least two layers.Due to the sawtooth on denoising structure 4
There is the effect of conflux on convex surface, and when air-flow flows through serrated face, air-flow can collect to sawtooth convex surface, effectively reduce the suction of fan blade
Vortex separation on power face 13, reduces fan wideband eddy current crack.By setting multilayer denoising structure 4 that can make air-flow in difference
Air-flow is generated on the denoising structure 4 of layer to collect, the separation of advance/retard friction layer air-flow, reduce fan wideband vortex and make an uproar
Sound.Blade 1 and multilayer denoising structure 4 are integrated injection or casting and forming.
As shown in Figure 1, multilayer denoising structure 4 is arranged at intervals successively along trailing edge 3 to blade inlet edge 5, it is preferred that every two
The distance between layer denoising structure 4 is equal, and the denoising structure 4 being arranged on 3 position of trailing edge is rear denoising structure 41,
Remaining denoising structure 4 being arranged on suction surface 13 is suction surface denoising structure, and suction surface denoising structure includes at least one layer of drop
Structure of making an uproar 4, the direction of suction surface denoising structure along trailing edge 3 to blade inlet edge 5 are followed successively by second layer denoising structure 42, third
Layer denoising structure ..., n-th layer denoising structure.Currently preferred denoising structure is two layers, i.e. rear denoising structure 41 and the
Two layers of denoising structure 42.
Every layer of denoising structure 4 extends to blade tip from blade root 12, it is ensured that air-flow to greatest extent.Rear drops
Structure of making an uproar 41 is penetrated from suction surface 13 to pressure face 14 at trailing edge 3, and suction surface denoising structure is on the suction surface of blade 1
The direction extension of 13 trailing edges 3.Rear denoising structure 41 penetrates blade 1, and suction surface denoising structure does not penetrate blade 1.Suction
Face denoising structure does not penetrate blade 1 convenient for the delay air-flow separation of more preferable air-flow.Rear denoising structure 41 is directly after blade
Machined on edge 3, suction surface denoising structure by with 1 integrally casting of blade, be directly molded on suction surface 13.
Denoising structure 4 is broached-tooth design or comb shaped structure, and broached-tooth design is arcuate corrugation sawtooth or triangular sawtooth.Comb shape
It is both provided with concave and convex surface in structure and broached-tooth design, the sawtooth on broached-tooth design is convex surface, and tooth socket is concave surface, comb shaped structure
On string configuration for convex surface, be provided with concave surface between two neighboring string configuration.On the denoising structure 4 of adjacent two layers
Male and fomale(M＆F) corresponds, and the concave surface or convex surface on front layer denoising structure 4 and the concave surface on rear layer denoising structure 4 or convex surface one are a pair of
It should.If the concave surface of front layer denoising structure 4 is corresponding with the convex surface of rear layer denoising structure 4, the effect of convex surface conflux can be destroyed, makes air-flow
Boundary-layer detaches in advance, increases fan eddy current crack.
As shown in Figures 3 and 4, when denoising structure 4 is broached-tooth design, sawtooth thickness h and saw on rear denoising structure 41
Relationship is between tooth position puts the 1 thickness H of fan blade of corresponding position：0.1H≤h≤0.5H.Sawtooth thickness is too small not to have conflux
Effect, sawtooth thickness, which crosses conference, leads to 3 insufficient strength of fan blade rear, and blade 1 deforms when causing the fan to rotate.Adjacent two
Relationship between spacing distance a and the width summation A of multilayer denoising structure 4 is between layer denoising structure 4：0<A≤0.2A, a and A
Ratio setting may insure that there is between adjacent layer denoising structure 4 optimal distance, that is, ensure that collecting for air-flow, and avoid
Since spacing is excessive, caused by the problem of interacting between the air-flow that generates of different layers denoising structure 4.
In the second embodiment of the present invention, the denoising structure 4 set on blade 1 can also be rectangular preiection structure or ladder
One kind of shape bulge-structure, the present embodiment have made conventional modification to the denoising structure 4 of the blade 1 of first embodiment, and specification is attached
Figure is not shown.
The invention also discloses a kind of fan, fan includes fan hub and motor, further includes above-mentioned blade 1, blade 1
In fan hub 2, fan hub 2 is mounted on motor.The mistake that motor in fan hub 2 is rotated with movable vane piece 1
Cheng Zhong, the air-flow that blade 1 generates generates friction layer along the flowing of suction surface 13 of blade, since air-flow can be on blade 1
Multilayer denoising structure 4 in protruding parts aggregation, play the effect that comes off of delay air-flow, be finally reached that reduce fan assembly wide
The effect of frequency eddy current crack.
The present invention on the suction surface 13 of fan blade by setting multilayer denoising structure 4, and the quantity of denoising structure 4 is at least
It is two layers.When air-flow flows through the suction surface 13 of fan blade, since there are multilayer noise reduction knots on the suction surface 13 of fan blade
Structure 4 can advance/retard friction layer air-flow separation, reduce fan wideband eddy current crack.On the denoising structure 4 of adjacent two layers
Male and fomale(M＆F) corresponds, and the concave surface or convex surface on front layer denoising structure 4 and the concave surface on rear layer denoising structure 4 or convex surface one are a pair of
Should, after can preventing the concave surface of front layer denoising structure 4 corresponding with the convex surface of rear layer denoising structure 4 in this way, destroy convex surface conflux
Effect makes friction layer detach in advance, increases fan eddy current crack.Since rear denoising structure 41 is air-flow in fan blade
The place finally converged on 1, the fan blade 1 of sawtooth thickness h and sawtooth position corresponding position on rear denoising structure 41 are thick
Relationship is between degree H：0.1H≤h≤0.5H, it can be ensured that sawtooth has optimal thickness, prevents too small of sawtooth thickness
Effect and sawtooth thickness less than conflux cross what blade 1 when conference leads to 3 insufficient strength of fan blade rear, fan rotation deformed
Problem.Denoising structure 4 is broached-tooth design or comb shaped structure, due to being both provided with convex surface and recessed on broached-tooth design and comb shaped structure
Face, there is the effect of conflux on convex surface in 1 rotation process of fan blade, and when air-flow flows through serrated face, air-flow can be to sawtooth convex surface
Collect, effectively reduce the vortex separation on the suction surface 13 of fan blade, reduce fan wideband eddy current crack.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, the invention is not limited in specific embodiment disclosed and described above, to the one of invention
A little modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, it although is used in this specification
Some specific terms, but these terms are merely for convenience of description, do not form any restrictions to invention.
Claims (10)
1. a kind of blade that multilayer denoising structure is set, which is characterized in that multilayer noise reduction knot is set on the suction surface of the blade
Structure, the quantity of the denoising structure are at least two layers.
A kind of 2. blade that multilayer denoising structure is set according to claim 1, which is characterized in that noise reduction knot described in multilayer
Structure is arranged at intervals successively along trailing edge to blade inlet edge, after the denoising structure being arranged on the trailing edge position is
Edge denoising structure, remaining the described denoising structure being arranged on the suction surface in addition to the rear denoising structure are dropped for suction surface
It makes an uproar structure, the suction surface denoising structure includes at least one layer of denoising structure.
A kind of 3. blade that multilayer denoising structure is set according to claim 1, which is characterized in that every layer of noise reduction knot
Structure extends to blade tip from blade root.
A kind of 4. blade that multilayer denoising structure is set according to claim 2, which is characterized in that the rear noise reduction knot
Structure is penetrated from the suction surface to pressure face at the trailing edge, and the suction surface denoising structure is not worn from the suction surface
Thoroughly to pressure face, the direction of suction surface denoising structure trailing edge on the suction surface of the blade extends.
5. a kind of blade that multilayer denoising structure is set according to claim 2, which is characterized in that the denoising structure is
Broached-tooth design or comb shaped structure, the broached-tooth design are arcuate corrugation sawtooth or triangular sawtooth.
6. a kind of blade that multilayer denoising structure is set according to claim 2, which is characterized in that the denoising structure is
One kind in rectangular preiection structure or trapezoidal bulge-structure.
7. a kind of blade that multilayer denoising structure is set according to claim 5 or 6, which is characterized in that adjacent two layers
Male and fomale(M＆F) on the denoising structure corresponds, the concave surface or convex surface described in front layer on denoising structure and the rear layer noise reduction knot
Concave surface or convex surface on structure correspond.
A kind of 8. blade that multilayer denoising structure is set according to claim 5 or 6, which is characterized in that the rear drop
Relationship is between the sawtooth thickness h in structure of making an uproar and the fan blade thickness H of sawtooth position corresponding position：0.1H≤h≤0.5H.
A kind of 9. blade that multilayer denoising structure is set according to claim 5 or 6, which is characterized in that adjacent two layers institute
Stating the relationship between denoising structure between the width summation A of denoising structure described in spacing distance a and multilayer is：0<a≤0.2A.
10. a kind of fan, the fan includes fan hub and motor, which is characterized in that further includes multiple blades, the blade
In the fan hub, the blade is claim 1-9 any one of them blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711441968.8A CN108167224A (en) | 2017-12-27 | 2017-12-27 | It is a kind of that the blade of multilayer denoising structure and the fan including the blade are set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711441968.8A CN108167224A (en) | 2017-12-27 | 2017-12-27 | It is a kind of that the blade of multilayer denoising structure and the fan including the blade are set |
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| Publication Number | Publication Date |
|---|---|
| CN108167224A true CN108167224A (en) | 2018-06-15 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711441968.8A Pending CN108167224A (en) | 2017-12-27 | 2017-12-27 | It is a kind of that the blade of multilayer denoising structure and the fan including the blade are set |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11187083B2 (en) | 2019-05-07 | 2021-11-30 | Carrier Corporation | HVAC fan |
| WO2022121412A1 (en) * | 2020-12-10 | 2022-06-16 | 广东美的暖通设备有限公司 | Impeller and fan |
| WO2022127287A1 (en) * | 2020-12-18 | 2022-06-23 | 广东美的暖通设备有限公司 | Wind wheel, fan, and air conditioner |
| USD980965S1 (en) | 2019-05-07 | 2023-03-14 | Carrier Corporation | Leading edge of a fan blade |
| TWI801140B (en) * | 2022-02-18 | 2023-05-01 | 宏碁股份有限公司 | Axial fan |
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| WO2017026150A1 (en) * | 2015-08-10 | 2017-02-16 | 三菱電機株式会社 | Air blower and air conditioning device equipped with air blower |
| CN205654595U (en) * | 2016-05-25 | 2016-10-19 | 新昌县鑫诺制冷设备有限公司 | A fan blade for axial fan is last |
| CN206785722U (en) * | 2017-02-09 | 2017-12-22 | 周家辉 | A kind of noise reduction drag reduction fan |
| CN107178524A (en) * | 2017-05-22 | 2017-09-19 | 奥克斯空调股份有限公司 | A kind of wing shaped low noise axial-flow leaf |
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| US11187083B2 (en) | 2019-05-07 | 2021-11-30 | Carrier Corporation | HVAC fan |
| USD980965S1 (en) | 2019-05-07 | 2023-03-14 | Carrier Corporation | Leading edge of a fan blade |
| WO2022121412A1 (en) * | 2020-12-10 | 2022-06-16 | 广东美的暖通设备有限公司 | Impeller and fan |
| WO2022127287A1 (en) * | 2020-12-18 | 2022-06-23 | 广东美的暖通设备有限公司 | Wind wheel, fan, and air conditioner |
| EP4265914A4 (en) * | 2020-12-18 | 2024-05-29 | Gd Midea Heating & Ventilating Equipment Co Ltd | Wind wheel, fan, and air conditioner |
| TWI801140B (en) * | 2022-02-18 | 2023-05-01 | 宏碁股份有限公司 | Axial fan |
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Application publication date: 20180615 |
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