Reinforced core material for a wind generator blade and preparation method therefor

Abstract

The present invention provides a reinforced core material for a fan blade, comprising a core material and reinforcements distributed inside the core material. The reinforcements comprise one or more first reinforcements and one or more second reinforcements that are spaced apart from each other and alternately distributed, wherein the first reinforcement and the second reinforcement extend transversely to the length direction of the reinforced core material, the tensile modulus and tensile strength of the first reinforcement are greater than the tensile modulus and tensile strength of the second reinforcement respectively, the first reinforcement is formed via resin infiltration on one or more fibers of the same or different shapes, and the second reinforcement is a synthetic high polymer.

Description

A reinforced core material for fan blades and preparation method thereof Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a reinforced core material for wind turbine blades and a preparation method thereof. Background Art

[0002] Wind turbine blades are key components in wind turbines. Key components include the main beam, trailing edge beam, web, and shell. The shell, a sandwich structure consisting of a core material and upper and lower skins, accounts for the largest proportion of the wind turbine blade area. The core material within this sandwich structure is one of the key materials in the wind turbine blade.

[0003] Currently, the core materials used in large quantities for blades primarily include balsa wood and rigid closed-cell foam. Balsa wood has a relatively high specific strength and modulus, but due to various factors, the supply and price of balsa wood are unstable. Therefore, rigid closed-cell foam is currently the most commonly used core material. Rigid foam is typically formed by foaming PET or PVC, but its strength and modulus are significantly lower than those of balsa wood.

[0004] The mechanical properties of the foam can be improved by increasing its density, but the resin absorption, blade weight and material cost are also greatly increased.

[0005] Summary of the Invention

[0006] In order to solve some or all of the problems in the prior art, the present invention provides a reinforced core material for a wind turbine blade, comprising:

[0007] core material; and

[0008] The reinforcements distributed inside the core material include N first reinforcements and M second reinforcements distributed at intervals, wherein the tensile modulus and tensile strength of the first reinforcement are greater than those of the second reinforcement, any one of the first reinforcements is formed by K types of fibers of the same or different forms impregnated with resin, and the second reinforcement is a synthetic polymer, wherein N, M, and K are natural numbers.

[0009] Furthermore, the fibers include glass fibers and / or carbon fibers and / or aramid fibers and / or natural fibers and / or ultra-high molecular weight polyethylene fibers and / or basalt fibers.

[0010] Furthermore, the fibers are in the form of fabric, chopped strand mat or non-woven fabric.

[0011] Furthermore, the resin includes a thermosetting resin or a thermoplastic resin.

[0012] Furthermore, the polymer includes thermosetting or thermoplastic resin.

[0013] Furthermore, the core material is a thermoplastic polymer or a thermosetting polymer or a material containing wood fiber or a copolymer and a mixture thereof.

[0014] Furthermore, the contour of the first surface of the core material is linear, wavy, serrated, irregular, or a combination of any of the above shapes.

[0015] Furthermore, any one of the first reinforcement and / or the second reinforcement forms an angle with the first surface of the core material.

[0016] Furthermore, the first reinforcement and the second reinforcement are both arranged perpendicular to the first surface of the core material, and the height of the second reinforcement is less than or equal to the thickness of the core material.

[0017] Furthermore, the outline of the first reinforcement and / or the second reinforcement is rectangular, triangular, trapezoidal, wavy, zigzag, grid-shaped, or a combination of any of the above outlines.

[0018] Furthermore, the sizes and / or shapes of any one of the first reinforcements and any one of the second reinforcements are the same or different.

[0019] Another aspect of the present invention provides a method for manufacturing the reinforced core material as described above, comprising:

[0020] impregnating the fibers with resin to obtain a first reinforcement;

[0021] curing the first reinforcement and the core material by pressurizing or heating to obtain a pre-reinforced core material; and

[0022] A second reinforcement is formed on the pre-reinforced core material.

[0023] Furthermore, the second reinforcement is made by vacuum infusion, resin transfer molding, extrusion, injection molding, or hand lay-up.

[0024] The present invention also provides a wind turbine blade made of the reinforced core material as described above, wherein the wind turbine blade includes a main beam, a web and a shell, wherein the main beam, web and shell include a sandwich structure and upper and lower skins, wherein the sandwich structure is formed by stacking one or more pieces of the reinforced core material as described above.

[0025] Furthermore, the upper and lower skins are made of glass fiber or carbon fiber reinforced polymer.

[0026] Furthermore, in a direction parallel to the chord direction of the blade, the first reinforcement bodies and the second reinforcement bodies in the sandwich structure are distributed at intervals.

[0027] Furthermore, the number of second reinforcement bodies between two adjacent first reinforcement bodies is any number.

[0028] Furthermore, the distances between two adjacent reinforcements are equal or unequal.

[0029] Furthermore, in a direction parallel to the length of the blade, the first reinforcement bodies and the second reinforcement bodies in the sandwich structure are distributed at intervals.

[0030] Furthermore, the number of second reinforcement bodies between two adjacent first reinforcement bodies is any number.

[0031] Furthermore, the distances between two adjacent reinforcements are equal or unequal.

[0032] The present invention provides a reinforced core material for wind turbine blades. By introducing first and second reinforcements into the core material, the core material's specific strength and specific modulus are improved while maintaining a relatively low infusion density. This material requires minimal changes to the existing core material's molding and processing techniques, is highly feasible, requires minimal additional equipment investment, and thus offers a high overall cost-effectiveness. Furthermore, the introduction of the second reinforcement can also impart overall flexibility to the reinforced core material. In practical applications, the mechanical properties of the reinforced core material can be adjusted by adjusting the weight and type of fibers in the first reinforcement, or by adjusting the type of resin in the first and second reinforcements, as needed. This is based on the following insight of the inventors. The inventors have found through research that by alternately distributing materials with high strength and modulus parameters and materials with low strength and modulus parameters in the core material to form a sandwich structure, the core material can have higher specific strength and specific modulus while also having higher flexibility, thereby improving the safety margin of the blade structure design. The applicants have found through research that, in particular, when the strength and modulus parameters are selected as tensile strength and tensile modulus, that is, when materials with large differences in tensile strength and tensile modulus are selected as the materials of the first and second reinforcements, the specific strength and specific modulus of the material can be maximized while taking into account the overall toughness of the sandwich structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more detailed description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings depict only typical embodiments of the present invention and are not to be considered as limiting the scope thereof. In the drawings, for clarity, identical or corresponding components will be represented by the same or similar reference numerals.

[0034] FIG1 is a schematic structural diagram of a reinforced core material for a wind turbine blade according to an embodiment of the present invention;

[0035] 2a-2c are schematic structural diagrams of reinforced core materials with different surface profiles according to an embodiment of the present invention;

[0036] 3a-3e are schematic structural diagrams of multiple reinforcements of different shapes according to an embodiment of the present invention;

[0037] 4a-4c are schematic structural diagrams showing a plurality of reinforcements with different distribution angles according to an embodiment of the present invention;

[0038] FIG5 is a schematic flow chart showing a method for preparing a reinforced core material for a wind turbine blade according to an embodiment of the present invention;

[0039] FIG6 is a schematic structural diagram of a fan blade according to an embodiment of the present invention; and

[0040] 7a-7c are schematic structural diagrams respectively showing sandwich structures of a plurality of different fan blades according to embodiments of the present invention. DETAILED DESCRIPTION

[0041] In the following description, the present invention is described with reference to various embodiments. However, those skilled in the art will recognize that the various embodiments can be implemented without one or more of the specific details or with other alternative and / or additional methods, materials, or components. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the inventive aspects of the present invention. Similarly, for the purpose of explanation, specific quantities, materials, and configurations are described to provide a comprehensive understanding of the embodiments of the present invention. However, the present invention is not limited to these specific details. In addition, it should be understood that the various embodiments shown in the drawings are illustrative representations and are not necessarily drawn to scale.

[0042] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. The appearances of the phrase "in one embodiment" in various places in this specification are not necessarily all referring to the same embodiment.

[0043] It should be noted that the embodiments of the present invention describe the process steps in a specific order. However, this is only for the purpose of illustrating the specific embodiment and does not limit the order of the steps. On the contrary, in different embodiments of the present invention, the order of the steps can be adjusted according to the process.

[0044] To provide a sandwich material with a stable raw material supply, manageable costs, and satisfactory mechanical properties for wind turbine blade manufacturing, the present invention improves upon existing core materials and their preparation methods, providing a reinforced core material for wind turbine blades and its preparation method. The present invention is further described below with reference to the accompanying drawings of the embodiments.

[0045] FIG1 is a schematic structural diagram of a reinforced core material for wind turbine blades according to an embodiment of the present invention. As shown in FIG1 , a reinforced core material for wind turbine blades comprises a core material 101, a first reinforcement 102, and a second reinforcement 103. The first reinforcement 102 and the second reinforcement 103 are spaced apart and distributed inside the core material 101, wherein the tensile modulus and tensile strength of the first reinforcement 102 are significantly greater than those of the second reinforcement 103. In this application, the term "A is significantly greater than B" means that A is at least 150% of B, in particular more than 200%, such as 300%, 400%, 500%, 1000%, etc. The first reinforcement 102 and the second reinforcement 103 extend transversely to the length direction of the reinforced core material 101. In the present invention, the term "A is transverse to B" means that A and B form an angle greater than 0, such as inclined to or perpendicular to. In one embodiment of the present invention, x second reinforcements 103 may be distributed between any two adjacent first reinforcements 102, or y first reinforcements 102 may be distributed between any two adjacent second reinforcements 103, where x and y are both integers greater than or equal to 0. In another embodiment of the present invention, the distance between any two adjacent reinforcements may be the same or different, wherein the two adjacent reinforcements may be two first reinforcements, one first reinforcement and one second reinforcement, or two second reinforcements.

[0046] The core material 101 may include thermoplastic polymers, thermosetting polymers, materials containing wood fibers, and copolymers, mixtures, and modifications thereof. The thermoplastic polymers include polyesters, polyvinyl chloride, polyamides, polystyrenes, polyacrylates, polyacrylic acids, polyolefins, polycycloolefins, polyacrylonitrile, polyetheramides, polyetheresters, polycarbonates, polyethers, polysulfones, polyketones, polyimides, polyphenylene esters, and copolymers, mixtures, and modifications thereof. The thermosetting polymers include epoxy resins, polyurethanes, phenolic resins, unsaturated polyesters, vinyls, silicones, modified silanes, cycloolefins, acrylic acid, bismaleimides, allyl resins, furan resins, amino resins, alkyd resins, and copolymers, mixtures, and modifications thereof. The wood fiber-containing materials may include naturally grown balsa wood, paulownia wood, poplar wood, willow wood, elm wood, locust wood, and composites formed by combining two or more of these wood fiber materials.

[0047] The first reinforcement and the second reinforcement extend from the first surface 001 of the core material to the interior thereof, but do not exceed the second surface 002 of the core material. In the same reinforced core material, the lengths of any first reinforcement and / or second reinforcement contained therein may be the same or different, wherein the first surface and the second surface of the core material refer to two surfaces perpendicular to the thickness direction of the core material. In an embodiment of the present invention, the contour of the first surface of the core material may be a variety of shapes, and Figures 2a-2c respectively show schematic structural diagrams of reinforced core materials with multiple different contour surfaces in an embodiment of the present invention. As shown in Figures 1 and 2a-2c, in an embodiment of the present invention, the contour of the first surface of the core material may be a straight line (Figure 1), a wavy shape (Figure 2a), a serrated shape (Figure 2b), an irregular shape (Figure 2c), or a combination of any of the above shapes.

[0048] In an embodiment of the present invention, there is no restriction on the profiles of the first reinforcement and the second reinforcement, and the profiles of any first reinforcement and / or second reinforcement contained in the same reinforced core material can be the same or different, that is, the same reinforced core material can contain multiple first reinforcements and second reinforcements with different or identical profiles. Figures 3a-3e respectively show schematic structural diagrams of multiple reinforcements of different shapes in an embodiment of the present invention. As shown in Figures 1 and 3a-3e, the profiles of the first reinforcement and / or the second reinforcement can be rectangular (Figure 1), triangular (Figure 3a), trapezoidal (Figure 3b), wavy (Figure 3c), zigzag (Figure 3d), grid-shaped (Figure 3e), or a combination of any of the above profiles.

[0049] In an embodiment of the present invention, the first reinforcement and the second reinforcement can be arranged parallel to the thickness direction of the core material, that is, perpendicular to the first surface of the core material, or at a certain angle to the thickness direction of the core material, and in the same reinforced core material, the arrangement direction of any first reinforcement and / or second reinforcement can be the same or different. Figures 1 and 4a-4c respectively show schematic structural diagrams of reinforcements with multiple different distribution angles in an embodiment of the present invention. In the embodiment shown in Figure 1, the first reinforcement and the second reinforcement are both perpendicular to the first surface of the core material, and the height of the second reinforcement is less than or equal to the thickness of the core material. In the embodiment shown in Figure 4a, there is an angle α between the first reinforcement and the first surface of the core material, and the angle α satisfies 0°≤α≤90°, and a second reinforcement arranged perpendicular to the first surface of the core material is included between two adjacent first reinforcements. The two adjacent first reinforcements are preferably arranged in a mirror image. In other embodiments of the present invention, the angles between two adjacent first reinforcements and the second reinforcement arranged between them can be the same or different. In the embodiment shown in Figure 4b, there is an angle β between the second reinforcement and the first surface of the core material, and the angle β satisfies 0°≤β≤90°. A first reinforcement arranged perpendicular to the first surface of the core material is included between two adjacent second reinforcements. The two adjacent second reinforcements are preferably arranged symmetrically relative to the first reinforcement. In other embodiments of the present invention, the angles between two adjacent second reinforcements and the first reinforcement arranged between them may be the same or different. In the embodiment shown in Figure 4c, there are angles between the first reinforcement and the second reinforcement and the first surface of the core material, thereby forming an angle γ between the adjacent first reinforcement and the second reinforcement, and the angle γ satisfies 0°≤γ≤90°. It should be understood that the arrangement direction of the first reinforcement and / or the second reinforcement is not limited to the situation shown in the figure, and in the same reinforced core material, the arrangement direction of any first reinforcement and / or second reinforcement may be the same or different.

[0050] In one embodiment of the present invention, any of the first reinforcements 102 is a fiber-reinforced resin composite material, which is formed by impregnating one or more fibers of the same or different forms with resin. In one embodiment of the present invention, the fibers include glass fibers, carbon fibers, aramid fibers, natural fibers, ultra-high molecular weight polyethylene fibers, or basalt fibers, and can be in the form of fabrics, chopped strand mats, or non-woven fabrics. If a fabric is used, the fabric can be non-curled or curled. Non-curled fabrics include unidirectional, biaxial, and triaxial fabrics, and curled fabrics can be plain, twill, satin, and other forms. The above-mentioned different forms of fibers can exist alone or in a composite form in a single layer of the first reinforcement. In one embodiment of the present invention, the resin-impregnated fibers are in the form of prepregs, unsaturated polyester glass fiber reinforced molding compounds (SMC), bulk molding compounds (BMC), and the like. The resin used can be a synthetic polymer compound, such as thermosetting and thermoplastic resins. Among them, the thermosetting resin includes epoxy, polyurethane, unsaturated polyester, phenolic, vinyl, silicone, modified silane, cycloolefin, acrylic, bismaleimide, allyl, furan, amino, alkyd resin, etc., and the thermoplastic resin includes polyolefin, polycycloolefin, polyvinyl chloride, polystyrene, polyacrylic acid, polyacrylate, polyamide, polyacrylonitrile, polyetheramide, polyetherester, polycarbonate, polyformaldehyde, thermoplastic polyester, polyether, fluororesin, polyphenylene sulfide, polyimide, polysulfone, polyketone, polyphenylene ester resin, etc., and one of their modified resins or polymer alloys.

[0051] In one embodiment of the present invention, the second reinforcement 103 is a synthetic polymer compound, such as a thermosetting resin or a thermoplastic resin. The thermosetting resin includes epoxy, polyurethane, unsaturated polyester, phenolic, vinyl, silicone, modified silane, cycloolefin, acrylic, bismaleimide, allyl, furan, amino, and alkyd resins, and the like; while the thermoplastic resin includes polyolefin, polycycloolefin, polyvinyl chloride, polystyrene, polyacrylic acid, polyacrylate, polyamide, polyacrylonitrile, polyetheramide, polyetherester, polycarbonate, polyoxymethylene, thermoplastic polyester, polyether, fluororesin, polyphenylene sulfide, polyimide, polysulfone, polyketone, polyphenylene ester resin, and modified resins or polymer alloys thereof. In one embodiment of the present invention, the second reinforcement 103 can be formed by vacuum infusion, resin transfer molding, extrusion, injection molding, hand lay-up, and the like.

[0052] FIG5 is a schematic flow chart of a method for preparing a reinforced core material for a wind turbine blade according to an embodiment of the present invention. As shown in FIG5 , a method for preparing a reinforced core material for a wind turbine blade includes:

[0053] First, in step 501, a first reinforcement is prepared. The fibers are impregnated with resin to obtain the first reinforcement, wherein the fibers include glass fibers, carbon fibers, aramid fibers, natural fibers, ultra-high molecular weight polyethylene fibers, or basalt fibers, etc., and can be in the form of fabrics, chopped strand mats, or non-woven fabrics. If fabrics are used, the fabrics can be non-curled fabrics or curled fabrics. Non-curled fabrics include unidirectional, biaxial, and triaxial fabrics, etc., and curly fabrics can be plain, twill, satin, etc., and the resin can be epoxy, polyurethane, unsaturated polyester, phenolic, vinyl , silicone, modified silane, cycloolefin, acrylic acid, bismaleimide, allyl, furan, amino, alkyd resin and other thermosetting resins, as well as polyolefin, polycycloolefin, polyvinyl chloride, polystyrene, polyacrylic acid, polyacrylate, polyamide, polyacrylonitrile, polyetheramide, polyetherester, polycarbonate, polyformaldehyde, thermoplastic polyester, polyether, fluororesin, polyphenylene sulfide, polyimide, polysulfone, polyketone, polyphenyl ester resin and other thermoplastic resins, or one of their modified resins or polymer alloys, or other high molecular compounds;

[0054] Next, in step 502, the first reinforcement and the core material are cured. The first reinforcement and the core material are cured by, for example, pressurization or heat curing to obtain a pre-reinforced core material, wherein the pressurization curing includes, for example, vacuum bag pressurization, mechanical tool pressurization, etc., and the heat curing includes contact and non-contact heating methods, such as oven heating, microwave heating, far infrared heating, welding, etc.; and

[0055] Finally, in step 503, a second reinforcement is formed. The second reinforcement is formed on the pre-reinforced core material. The second reinforcement is made, for example, by vacuum infusion, resin transfer molding, extrusion, injection molding, or hand lay-up. In one embodiment of the present invention, the production of the second reinforcement includes:

[0056] Punching holes and / or slotting at preset positions of the pre-reinforced core material to obtain deep holes and / or deep slots and / or shallow slots;

[0057] The deep holes and / or deep grooves and / or shallow grooves are filled with a polymer compound, wherein the polymer compound may be, for example, a thermosetting resin or a thermoplastic resin. The thermosetting resin includes epoxy, polyurethane, unsaturated polyester, vinyl, phenolic, silicone, modified silane, cycloolefin, acrylic, bismaleimide, allyl, furan, amino, alkyd resin, etc.; and the thermoplastic resin includes polyolefin, polycycloolefin, polyvinyl chloride, polystyrene, polyacrylic acid, polyacrylate, polyamide, polyacrylonitrile, polyetheramide, polyetherester, polycarbonate, polyoxymethylene, thermoplastic polyester, polyether, fluororesin, polyphenylene sulfide, polyimide, polysulfone, polyketone, polyphenyl ester resin, etc., and modified resins or polymer alloys thereof.

[0058] The above-mentioned reinforced core material and its preparation method can be applied to wind turbine blades. FIG6 shows a schematic structural diagram of a wind turbine blade according to an embodiment of the present invention. As shown in FIG6 , a wind turbine blade includes a leading edge 601, main beams 621 and 622, a pressure surface 603, a suction surface 604 and a trailing edge 605. At the same time, two webs 661 and 662 are fixed between the two main beams 621 and 622, wherein the main beams, webs, pressure surfaces, suction surfaces and tail beams include upper and lower skins and a sandwich structure. The material of the upper and lower skins can be a glass fiber or carbon fiber reinforced polymer, and the reinforced core material as described above can be applied to the sandwich structure, that is, the sandwich structure can be formed by stacking one or more reinforced core materials as described above.

[0059] The distribution of the first reinforcement and the second reinforcement contained in the sandwich structures of different wind turbine blades or different parts can be the same or different. In the present invention, the direction parallel to the length of the blade is taken as the first direction, the direction parallel to the chord direction of the blade is taken as the second direction, and the direction parallel to the thickness of the blade is taken as the third direction. Then, in the sandwich structure of the wind turbine blade, in the direction parallel to the second direction, the first reinforcement and the second reinforcement can be distributed at intervals, wherein one or more second reinforcements can be present between every two separate first reinforcements, or one or more first reinforcements can be present between every two separate second reinforcements, and at the same time, the distance between any two adjacent reinforcements can be equal or unequal, wherein any two adjacent reinforcements can be two first reinforcements, or one first reinforcement and one second reinforcement, or two second reinforcements. Similarly, in a direction parallel to the first direction, the first reinforcement and the second reinforcement may also be distributed at intervals, wherein one or more second reinforcements may be present between every two separate first reinforcements, or one or more first reinforcements may be present between every two separate second reinforcements, and at the same time, the distances between any two adjacent reinforcements may be equal or unequal, wherein any two adjacent reinforcements may be two first reinforcements, or one first reinforcement and one second reinforcement, or two second reinforcements. In addition, in other embodiments of the present invention, in a direction parallel to the first direction, only the first reinforcement or the second reinforcement may be arranged, and the distances between any two adjacent first reinforcements or second reinforcements may be equal or unequal. Figures 7a-7c respectively show schematic structural diagrams of sandwich structures of multiple different wind turbine blades in embodiments of the present invention. In the structure shown in FIG7a, the first reinforcement and the second reinforcement are both arranged at intervals in a direction parallel to the first direction and in a direction parallel to the second direction; in the structure shown in FIG7b, the first reinforcement and the second reinforcement are both arranged at intervals in a direction parallel to the second direction, but only the first reinforcement is arranged in a direction parallel to the first direction; and in the structure shown in FIG7c, the first reinforcement and the second reinforcement are both arranged at intervals in a direction parallel to the second direction, but only the second reinforcement is arranged in a direction parallel to the first direction. It should be understood that in other embodiments of the present invention, the arrangement is not limited to that shown in the figure. For example, the number of second reinforcements between two adjacent first reinforcements is not limited to one as shown in the figure, but can be multiple, and the number of second reinforcements between any two adjacent first reinforcements can be different. For another example, the number of first reinforcements between two adjacent second reinforcements is not limited to one as shown in the figure, but can be multiple, and the number of first reinforcements between any two adjacent second reinforcements can be different.

[0060] The present invention provides a reinforced core material for wind turbine blades. By introducing first and second reinforcements into the core material, the core material's specific strength and specific modulus are improved while maintaining a relatively low infusion density. This material requires minimal changes to the existing core material's molding and processing techniques, is highly feasible, requires minimal additional equipment investment, and thus offers a high overall cost-effectiveness. Furthermore, the introduction of the second reinforcement can also impart overall flexibility to the reinforced core material. In practical applications, the mechanical properties of the reinforced core material can be adjusted by adjusting the weight and type of fibers in the first reinforcement, or by adjusting the type of resin in the first and second reinforcements, as needed.

[0061] Although various embodiments of the present invention have been described above, it should be understood that they are presented by way of example only and not limitation. It will be apparent to those skilled in the relevant art that various combinations, modifications, and variations may be made thereto without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should be defined solely in accordance with the appended claims and their equivalents.

Claims

1. A reinforced core material for a wind turbine blade, characterized in that: include: core material; as well as The reinforcements distributed inside the core material include one or more first reinforcements and one or more second reinforcements that are spaced apart from each other and distributed alternately, wherein the first reinforcements and the second reinforcements extend transversely to the length direction of the reinforced core material and the tensile modulus and tensile strength of the first reinforcement are respectively greater than the tensile modulus and tensile strength of the second reinforcement, and the first reinforcement is formed by one or more fibers of the same or different forms impregnated with resin, and the second reinforcement is a polymer.

2. The reinforced core material according to claim 1, characterized in that The tensile modulus of the first reinforcement is 150% or more of the tensile modulus of the second reinforcement, and the tensile strength of the first reinforcement is 150% or more of the tensile strength of the second reinforcement.

3. The reinforced core material according to claim 1, wherein: The fibers include glass fibers and / or carbon fibers and / or aramid fibers and / or natural fibers and / or ultra-high molecular weight polyethylene fibers and / or basalt fibers.

4. The reinforced core material according to claim 1, wherein The fibers are in the form of fabric, chopped strand mat or laid fabric.

5. The reinforced core material according to claim 1, wherein: The resin includes a thermosetting or thermoplastic resin.

6. The reinforced core material according to claim 1, wherein: The high polymer includes a thermosetting or thermoplastic resin.

7. The reinforced core material according to claim 1, characterized in that: The core material is made of thermoplastic polymer or thermosetting polymer or a material containing wood fiber or a copolymer or mixture thereof.

8. The reinforced core material according to claim 1, wherein: The contour of the first surface of the core material is linear, wavy, serrated, irregular, or a combination of any of the above shapes.

9. The reinforced core material according to claim 1, wherein: Any one of the first reinforcement and / or the second reinforcement forms an angle with the first surface of the core material.

10. The reinforced core material according to claim 9, characterized in that: The height of the second reinforcement is less than or equal to the thickness of the core material.

11. The reinforced core material according to claim 1, wherein The outline of the first reinforcement and / or the second reinforcement is rectangular, triangular, trapezoidal, wavy, zigzag, grid-shaped, or a combination of any of the above outlines.

12. The reinforced core material according to claim 1, wherein The sizes and / or shapes of any one of the first reinforcements and any one of the second reinforcements are the same or different.

13. A method for manufacturing the reinforced core material according to any one of claims 1 to 12, characterized in that: Including steps: impregnating the fibers with resin to obtain a first reinforcement; curing the first reinforcement and the core material to obtain a pre-reinforced core material; and A second reinforcement is formed on the pre-reinforced core material.

14. The method according to claim 13, wherein The second reinforcement is made by vacuum infusion, resin transfer molding, extrusion, injection molding, or hand lay-up.

15. A wind turbine blade comprising a main beam, a web and a shell, wherein the main beam, web and shell comprise a sandwich structure and upper and lower skins, characterized in that: The sandwich structure is formed by stacking one or more pieces of reinforced core material according to any one of claims 1 to 12.

16. The fan blade according to claim 15, wherein: The upper and lower skins are made of glass fiber or carbon fiber reinforced polymer.

17. The fan blade according to claim 15, wherein: In a direction parallel to the chord direction of the blade, the first reinforcement bodies and the second reinforcement bodies in the sandwich structure are distributed at intervals.

18. The fan blade according to claim 16, wherein: In the direction parallel to the chord direction of the blade, the number of the second reinforcement bodies between two adjacent first reinforcement bodies is any integer.

19. The fan blade according to claim 16, wherein: In the direction parallel to the chord direction of the blade, the distances between two adjacent reinforcement bodies are equal or unequal.

20. The fan blade according to claim 17, wherein: In a direction parallel to the length of the blade, the first reinforcement bodies and the second reinforcement bodies in the sandwich structure are distributed at intervals.

21. The wind turbine blade according to claim 20, wherein: In the direction parallel to the length of the blade, the number of the second reinforcement bodies between two adjacent first reinforcement bodies is any integer.

22. The wind turbine blade according to claim 20, wherein: In the direction parallel to the length of the blade, the distances between two adjacent reinforcement bodies are equal or unequal.