CN115387955B - Coreless material wind power blade tip structure and forming method - Google Patents
Coreless material wind power blade tip structure and forming method Download PDFInfo
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- CN115387955B CN115387955B CN202211255714.8A CN202211255714A CN115387955B CN 115387955 B CN115387955 B CN 115387955B CN 202211255714 A CN202211255714 A CN 202211255714A CN 115387955 B CN115387955 B CN 115387955B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 title abstract description 7
- 230000008093 supporting effect Effects 0.000 claims abstract description 37
- 230000003993 interaction Effects 0.000 claims abstract description 30
- 230000005611 electricity Effects 0.000 claims abstract description 9
- 238000010146 3D printing Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000000638 solvent extraction Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 6
- 238000010248 power generation Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0025—Producing blades or the like, e.g. blades for turbines, propellers, or wings
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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
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/307—Blade tip, e.g. winglets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention relates to the technical field of wind power blades, in particular to a coreless wind power blade tip part structure and a forming method, wherein the structure comprises the following steps: set up a plurality of apex subsections along wind-powered electricity generation blade's length direction, each apex subsection includes: the supporting structure is formed by intersecting a plurality of circular structures, the diameters of the circular structures are different, any two circular structures intersect to form an interaction point, and the interaction point is used for supporting the sectional profile shape of the blade tip; the skin structure is coated outside the supporting structure; the blade tip part section outline shape is formed by arranging a plurality of circular structures which are connected in an intersecting manner, an external skin structure is supported, and a sandwich structure is removed, so that the materials of the skin structure and the internal support structure are consistent, the weight of the blade is greatly reduced, the aeroelastic stability of the blade is ensured, the stability of the blade structure in the operation process is facilitated, and the power generation efficiency is greatly improved; meanwhile, a forming method of the tip part structure is also provided.
Description
Technical Field
The invention relates to the technical field of wind power blades, in particular to a coreless wind power blade tip part structure and a forming method.
Background
The blade is one of key parts of the wind generating set, the blade is blown to rotate by the wind speed of natural wind of gas, the kinetic energy generated by the rotation of the blade drives the generator to generate power, and the wind energy is widely applied as a pollution-free clean energy source at present with deficient natural resources.
Wind-powered electricity generation blade generally includes the blade root portion of being connected with wheel hub and bears the blade tip portion of thrust, under the general condition, in order to obtain more wind energy in order to improve the generating power of fan, can increase wind-powered electricity generation blade's size, and then lead to the holistic weight of blade to increase, this has provided higher requirement to being connected of blade root portion and wheel hub, simultaneously, when wind-powered electricity generation blade operation, overweight blade structure is unfavorable for maintaining the stability of operation, easily produces the deformation.
Chinese patent with patent publication No. CN112443451A discloses a novel wind power generation blade, through at the inside stay tube that sets up of blade shell to set blade shell to polylith panel, the panel of each blade shell forms an organic whole with the wall connection of stay tube, can effectively prevent to warp, and it is less to set up the stay tube diameter simultaneously, and the panel is the battenboard, easily realizes the blade lightweight, thereby improves the generating efficiency.
In the blade structure, the panel is the sandwich panel, and the sandwich structure generally uses balsa wood, PVC foam, PET foam and the like, so that the density of materials is large relative to other positions, the performance difference is large, and the stability of the operation of the blade is not favorably maintained.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the blade tip structure of the coreless wind power blade and the forming method are provided, and the problems in the background art are effectively solved.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a there is not core wind-powered electricity generation blade tip portion structure, sets up a plurality of apex subsections along the length direction of wind-powered electricity generation blade, and each apex subsection includes:
the supporting structure is formed by intersecting a plurality of circular structures, the diameters of the circular structures are different, any two circular structures intersect to form an interaction point, and the interaction point is used for supporting the outline shape of the blade tip part section;
and the skin structure is coated outside the supporting structure to form a blade tip part section structure.
Furthermore, the diameter of the circular structure is gradually reduced from the middle to the front edge and the rear edge, and the diameter of the circular structure close to the front edge is larger than that of the circular structure close to the rear edge.
Furthermore, the center of each circular structure is arranged on the middle arc line of the blade tip partial section.
Further, the circular structure is in point contact or surface contact with the skin structure.
Further, each round structure is intersected with at least 5 adjacent round structures on two sides.
Further, the intersection of the circular structures at least correspondingly forms 10 interaction points.
Furthermore, the interaction points and the intersected circular structures are connected at intervals to form a through cavity, and the cavity is arranged along the length direction of the wind power blade.
Furthermore, at least two interaction points and intersecting circular structures are corresponding to each cavity.
The invention also provides a method for forming the blade tip structure of the coreless wind power blade, which is used for forming the blade tip structure of the coreless wind power blade and comprises the following steps:
building a three-dimensional model of the blade tip part section through a computing mechanism, wherein the blade tip part section comprises an internal supporting structure and an external skin structure, and partitioning the built three-dimensional model of the blade tip part section into slices layer by layer;
and connecting the 3D printer with a computer, and forming an integrated blade tip part section structure through 3D printing.
The invention also provides a method for forming the blade tip structure of the coreless wind power blade, which is used for forming the blade tip structure of the coreless wind power blade and comprises the following steps:
providing a skin structure mold;
forming a skin structure outside the blade tip part section by using the skin structure mold to form a preformed body of the skin structure;
building a three-dimensional model of a supporting structure in the blade tip part section through a computing mechanism, and partitioning the built supporting structure model into slices layer by layer;
connecting a 3D printer with a computer, and forming a supporting structure through 3D printing;
and bonding the formed skin structure and the support structure through structural adhesive to form an integrated structure.
The invention has the beneficial effects that: according to the blade tip part-section contour shape, the blade tip part-section contour shape is formed by arranging the plurality of intersected and connected circular structures, the external skin structure is supported, a stable supporting structure is formed, and meanwhile, the sandwich structure is removed, so that the materials of the skin structure and the internal supporting structure are consistent, the weight of the blade is greatly reduced, the aeroelastic stability of the blade is ensured, the structural stability of the blade in the operation process is facilitated, and the power generation efficiency is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a blade tip portion of a coreless wind turbine blade according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a blade tip structure of a coreless wind turbine blade according to an embodiment of the present invention;
FIG. 3 is a partial schematic view of a support structure according to one embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a method for forming a blade tip structure of a coreless wind turbine blade according to a second embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for forming a blade tip structure of a coreless wind turbine blade according to a third embodiment of the present invention.
Reference numerals: 01. a support structure; 02. a skin structure; 03. a circular structure; 04. an interaction point; 05. a cavity; 06. a mean camber line.
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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
As shown in fig. 1 to 3, the coreless wind power blade tip portion structure sets up a plurality of tip subsections along the length direction of the wind power blade, and each tip subsection includes:
the supporting structure 01 is formed by intersecting a plurality of circular structures 03, the diameters of the circular structures 03 are different, any two circular structures 03 intersect to form an interaction point 04, and the interaction point 04 is used for supporting the sectional profile shape of the blade tip;
and the skin structure 02 is coated outside the supporting structure 01 to form a blade tip part section structure.
It should be noted that, the circular structure 03 is a hollow structure with a circular cross section, and since the circle has higher torsional rigidity, after the plurality of circular structures 03 are connected in an intersecting manner, there are mutually overlapped connecting portions, which has higher connecting strength compared with point connection, and in the blade operation process, the continuous and intersecting connected circular structures 03 make the torsional deformation of the blade small, which is beneficial to balancing the aeroelastic deformation and improving the operation stability.
The blade tip part section outline shape is formed by the circular structures 03 which are connected in an intersecting mode and used for supporting the external skin structure 02, the stable supporting structure 01 is formed, and the sandwich structure is removed, so that the skin structure 02 and the internal supporting structure 01 are made of the same materials, the weight of the blade is greatly reduced, the aeroelastic stability of the blade is guaranteed, the blade structure stability in the operation process is facilitated, and the power generation efficiency is greatly improved.
On the basis of the above embodiment, the diameter of the circular structure 03 gradually decreases from the middle to the front edge and the rear edge, and the diameter of the circular structure 03 near the front edge is larger than the diameter of the circular structure 03 near the rear edge, that is, the diameter of the circular structure 03 gradually increases from the front edge of the tip segment to the middle position, and then gradually decreases from the middle position to the rear edge to the minimum diameter.
As the front edge of the blade is smooth and the rear edge of the blade is in a sharp angle shape, in order to be more suitable for the shape structures of the front edge and the rear edge, the diameter of the round structure 03 close to the front edge is larger than that of the round structure 03 close to the rear edge, and the diameter of the round structure 03 at the front edge and the diameter of the round structure 03 at the rear edge are respectively suitable for the shape structures of the front edge and the rear edge.
On the basis of the above embodiment, the center of each circular structure 03 is arranged on the camber line 06 of the blade tip segment, so that the circular structures 03 distributed on the upper half portion and the lower half portion of the blade tip segment are equivalent to each other, and the circular structures 03 can support the shape structures of the blade tip segment of the upper half portion and the blade tip segment of the lower half portion to form a stable supporting structure 01.
On the basis of the above embodiment, the circular structure 03 is in point contact or surface contact with the skin structure 02, after the circular structure 03 at the front edge position and the circular structure 03 at the rear edge position are coated by the skin structure 02, the circular structure 03 is in surface contact with the skin structure 02, the contact surface is arc-shaped, the arc-shaped surface is matched with the shape structures of the front edge and the rear edge, the circular structure 03 between the front edge and the rear edge position is in point contact with the inner surface points of the airfoil profile of the upper half part and the lower half part of the blade tip partial section respectively, namely, the circular structure is arranged in a tangent mode, the skin structure 02 is sequentially connected with the positions of the tangent points, so that the shape structure of the blade tip partial section is formed, and the tangent points form the supporting points of the skin structure 02 and have a certain supporting effect on maintaining the shape of the skin structure 02.
On the basis of the embodiment, each round structure 03 is at least intersected with 5 adjacent round structures 03 on two sides, so that the mutual distance between the round structures 03 is more compact, more round structures 03 are arranged to form a supporting structure 01, when the skin structure 02 is coated on the supporting structure 01, the blade tip part segment shape structure can be better adapted to, on the other hand, the round structures 03 can be connected with more adjacent round structures 03, more interaction points 04 are formed, in the use process of the blade, the action of redundant force can be dispersed to more interaction points 04 through the adjacent round structures 03, the local stress action is reduced, the damage in the use process is avoided, and the use stability is improved.
On the basis of the above embodiment, the intersection of the circular structures 03 at least correspondingly forms 10 interaction points 04, and it is explained that each circular structure 03 intersects with 5 circular structures 03 adjacent to two sides, that is, 10 interaction points 04 are formed and are respectively located at the upper and lower sides of the blade tip segment, and since the diameters of the circular structures 03 are different, the circular structure 03 located in the middle forms more interaction points 04 with more circular structures 03 adjacent to two sides, and the more interaction points 04, the more support structures 01 formed by the circular structures 03 are stable, so that the stability of the formed blade tip segment structure is better.
On the basis of above-mentioned embodiment, interaction point 04 is connected with crossing circle structure 03 interval each other, form the cavity 05 that link up, cavity 05 sets up along the length direction of wind-powered electricity generation blade, through setting up cavity 05, form hollow bearing structure 01, under the prerequisite that does not influence structural stability, the material use amount of circle structure 03 has been reduced, the weight of the lobe portion has been alleviateed greatly simultaneously, the transportation of being convenient for, in addition, also can blow the blade rotation under the less condition of wind speed, it realizes wind power generation to drive the generator, the generating efficiency has been promoted greatly.
On the basis of the above embodiment, at least two interaction points 04 and intersecting circular structures 03 are provided for each cavity 05, that is, the following three cases exist:
(1) Willow leaf-shaped cavity: the edges of two adjacent circular structures 03 are intersected, two interaction points 04 are close to the middle arc line 06 of the blade tip part section, and the arc angle of an arc part connected with the interaction points 04 at intervals is small, so that the cross section of the formed cavity 05 is small and is in a slender willow-leaf shape; this arrangement concentrates the interaction points 04 on both sides of the mean camber line 06, which has a supporting effect on the shape maintenance of the support structure 01 and the overall shape structure of the blade tip segment.
(2) A quadrilateral cavity: the non-intersected side of two adjacent circular structures 03 is intersected with the other circular structure 03, four arc-shaped parts and interaction points 04 are formed in one side where the circle center of the other circular structure 03 is located, and a larger cavity 05 section shape is formed, wherein the circle centers of two opposite arc-shaped edges of one group of the arc-shaped structures are located on the same side, and the other group of the arc-shaped structures is located on different sides; or, two adjacent circular structures 03 intersect with another two adjacent circular structures 03 to form a slightly smaller cross-sectional shape of the cavity 05, and the centers of two sets of opposite arc-shaped edges of the arc-shaped structures are located on the same side; the interaction points 04 are distributed at the connecting points of the round structures 03 and other round structures 03, so that the connecting action between the round structures 03 is tighter, and the stability of the supporting structure 01 is ensured.
(3) Sector-shaped cavity: three adjacent circle structure 03 crossing connection, it is crossing with the one side that left and right sides circle structure 03 deviates from the centre of a circle place to be located middle circle structure 03, the arc position that the three-section is connected through interaction point 04 forms fan-shapedly, the centre of a circle at arc position all faces one side at camber line 06 place, one side protrusion setting towards skin structure 02, this kind of mode of setting concentrates on skin structure 02 and bearing structure 01's hookup location with interaction point 04, when playing supporting effect to skin structure 02, skin structure 02 and bearing structure 01's area of being connected has been increased, guarantee the stability of connecting, accord with final fashioned leaflet point portion shape structure more.
Example two
The invention also provides a method for forming the blade tip part structure of the coreless wind power blade, which is used for forming the blade tip part structure of the coreless wind power blade in the first embodiment and comprises the following steps:
building a three-dimensional model of the blade tip part section through a computing mechanism, wherein the blade tip part section comprises an internal supporting structure and an external skin structure, and partitioning the built three-dimensional model of the blade tip part section into slices layer by layer;
and connecting the 3D printer with a computer, and forming an integrated blade tip part section structure through 3D printing.
Utilize 3D printing technique, each apex subsection that can the direct forming, and the apex subsection formula structure as an organic whole that obtains, overall stability is strong, and the blade is anti torsional rigidity big, and the operation is stable, avoids using connecting agent such as structure glue simultaneously, saves the use of raw and other materials.
EXAMPLE III
The invention also provides a method for forming the blade tip part structure of the coreless wind power blade, which is used for forming the blade tip part structure of the coreless wind power blade in the first embodiment and comprises the following steps:
providing a skin structure mold;
forming a skin structure outside the blade tip part section by using the skin structure mold to form a preformed body of the skin structure;
building a three-dimensional model of a supporting structure in the blade tip part section through a computing mechanism, and partitioning the built supporting structure model into slices layer by layer;
connecting a 3D printer with a computer, and forming a supporting structure through 3D printing;
and bonding the formed skin structure and the support structure through structural adhesive to form an integrated structure.
In consideration of the surface quality of the blade, the skin structure is prefabricated by the segmented mold, and then the skin structure is bonded with the 3D printing formed support structure into a whole through structural adhesive, so that the surface quality of the partial segmented part of the blade tip can be better ensured.
It should be noted that, the computer related to the present invention has a readable memory storing computer program instructions or storing computer program instructions installed in the computer, and the computer program instructions can instruct the computing mechanism to create a three-dimensional model of the blade tip segment, divide the blade tip segment into slices layer by layer, and instruct the 3D printer to complete the printing operation.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a there is not core wind-powered electricity generation blade tip portion structure, sets up a plurality of apex subsections along the length direction of wind-powered electricity generation blade, its characterized in that, each apex subsection includes:
the supporting structure is formed by intersecting a plurality of circular structures, the diameters of the circular structures are different, any two circular structures intersect to form an interaction point, and the interaction point is used for supporting the outline shape of the blade tip part section;
the skin structure is coated outside the supporting structure to form a blade tip part section structure;
each round structure is at least intersected with 5 adjacent round structures on two sides;
the diameter of the circular structure is gradually reduced from the middle to the front edge and the rear edge, and the diameter of the circular structure close to the front edge is larger than that of the circular structure close to the rear edge;
the round structure is in point contact or surface contact with the skin structure.
2. The coreless wind turbine blade tip portion structure of claim 1, wherein a center of each of the circular structures is disposed on a median arc of the tip portion section.
3. The coreless wind turbine blade tip structure of claim 1, wherein the circular structures intersect to form at least 10 interaction points.
4. The coreless wind turbine blade tip portion structure of claim 1, wherein the interaction points and the intersecting circular structures are connected with each other at intervals to form a through cavity, and the through cavity is arranged along a length direction of the wind turbine blade.
5. The coreless wind turbine blade tip structure of claim 4, wherein there are at least two of the interaction points and intersecting circular structures for each of the cavities.
6. A method for forming a blade tip structure of a coreless wind power blade, which is used for forming the blade tip structure of the coreless wind power blade in any one of claims 1 to 5, and comprises the following steps:
building a three-dimensional model of the blade tip part section through a computing mechanism, wherein the blade tip part section comprises an internal supporting structure and an external skin structure, and partitioning the built three-dimensional model of the blade tip part section into slices layer by layer;
and connecting the 3D printer with a computer, and forming an integrated blade tip part section structure through 3D printing.
7. A method for forming a blade tip structure of a coreless wind power blade, which is used for forming the blade tip structure of the coreless wind power blade in any one of claims 1 to 5, and comprises the following steps:
providing a skin structure mold;
forming a skin structure outside the blade tip part section by using the skin structure mold to form a preformed body of the skin structure;
building a three-dimensional model of a supporting structure in the blade tip part section through a computing mechanism, and partitioning the built supporting structure model into slices layer by layer;
connecting a 3D printer with a computer, and forming a supporting structure through 3D printing;
and bonding the formed skin structure and the support structure through structural adhesive to form an integrated structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211255714.8A CN115387955B (en) | 2022-10-13 | 2022-10-13 | Coreless material wind power blade tip structure and forming method |
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| CN202211255714.8A CN115387955B (en) | 2022-10-13 | 2022-10-13 | Coreless material wind power blade tip structure and forming method |
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| CN115387955B true CN115387955B (en) | 2023-04-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102015219530A1 (en) * | 2015-10-08 | 2017-04-13 | Rolls-Royce Deutschland Ltd & Co Kg | Blade for a turbomachine, turbofan engine and a method for producing a blade |
| EP3395561B1 (en) * | 2017-04-26 | 2020-12-30 | Airbus Operations, S.L. | Three dimensional auxetic structure, manufacturing method and tooling |
| US10800542B2 (en) * | 2017-07-14 | 2020-10-13 | Hamilton Sunstrand Corporation | Ram air turbine blades |
| US10633976B2 (en) * | 2017-07-25 | 2020-04-28 | Bell Helicopter Textron Inc. | Methods of customizing, manufacturing, and repairing a rotor blade using additive manufacturing processes |
| CN110374796A (en) * | 2019-07-29 | 2019-10-25 | 明阳智慧能源集团股份公司 | A kind of wind-driven generator inflatable blade construction |
| EP4121350A4 (en) * | 2020-03-20 | 2024-07-24 | Fabheads Automation Private Ltd | A composite fibre structure and the process of manufacturing thereof |
| CN112443451A (en) * | 2020-12-18 | 2021-03-05 | 张跃 | Novel wind power generation blade |
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