A wind turbine blade and a wind turbine including the same

Abstract

The present invention discloses a wind turbine blade and a wind turbine including the same, belonging to the field of wind turbine generator sets, and comprising a main beam and a core material connected to the main beam, wherein the main beam and the core material are connected in a concave-convex manner. The main beam and / or the trailing edge beam of the present invention adopt a concave-convex connection contact method with the core material to improve the stability of the blade structure. The problem in the prior art that the connection between the core material and the main beam becomes a structural weak point and is easily damaged due to the vertical docking method is solved. The concave-convex connection contact method provided by the present invention can improve the stability of this area, thereby making the blade structure more stable.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine generator sets, and in particular to a wind turbine generator blade and a wind turbine generator comprising the same. Background Art

[0002] As power generation tends to develop in large scale, wind turbine blades are getting bigger and bigger, which also puts higher requirements on the structural stability of wind turbine blades. Due to the large size and heavy weight of large blades, it is easy to damage the trailing edge if the lifting plan is not good, and the damaged location is usually the area where the core material connects with the trailing edge beam. As the blades are getting bigger and bigger, the main beam of the blade is getting wider and wider. When the main beam is too wide, it is easy to cause in-plane buckling instability, and the damaged area is usually the connection between the main beam and the core material.

[0003] It can be seen that the existing contact form is not conducive to the structural stability of large blades. Therefore, the present invention proposes a new connection form. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a wind turbine blade and a wind turbine generator including the same, which can improve the structural stability of wind turbine blades and ensure the long-term stable and safe operation of the blades.

[0005] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0006] In one aspect, the present invention provides a wind turbine blade, comprising a main beam and a core material connected to the main beam, wherein the main beam and the core material are connected in a concave-convex manner.

[0007] Furthermore, the two ends of the main beam are convex corners, and the connection between the core material and the main beam is a groove that matches the convex corners. Furthermore, the slope of the convex corners is less than 1:5.

[0008] Furthermore, grooves are provided at both ends of the main beam, and the connection between the core material and the main beam is a convex angle matched with the groove. Furthermore, the convex angle is an oblique angle, and the efficiency of the oblique angle is less than 1:5.

[0009] Furthermore, the gap between the main beam and the core material is filled with dry yarn.

[0010] Furthermore, the main beam and the core material are formed by being laid on the blade shell in sequence and integrally poured.

[0011] Furthermore, it also includes a rear edge beam, and the rear edge beam is connected to the core material in a concave-convex manner.

[0012] Furthermore, both ends of the trailing edge beam are convex corners, and the connection between the core material and the trailing edge beam is a groove that matches the convex corners.

[0013] Furthermore, grooves are provided at both ends of the trailing edge beam, and the connection between the core material and the trailing edge beam is a convex angle that matches the grooves.

[0014] On the other hand, a wind turbine is provided, comprising the wind turbine blade.

[0015] After adopting such a design, the present invention has at least the following advantages:

[0016] (1) The main beam and / or trailing edge beam of the present invention adopts a concave-convex connection contact method with the core material to improve the stability of the blade structure. This solves the problem in the prior art that the core material and the main beam are connected vertically, making the connection point a structural weak point and susceptible to damage. The concave-convex connection contact method provided by the present invention can improve the stability of this area, thereby making the blade structure more stable.

[0017] (2) The present invention aims at the weak points of the current wind turbine blade structure and proposes a new contact form between the core material and the main beam and the trailing edge beam - a concave-convex connection, which can improve the stiffness of the intersection area between the core material and the main beam and the trailing edge beam; and reduce the probability of damage to the intersection area between the core material and the main beam and the trailing edge beam; and improve the stability of the wind turbine blade structure and the safety factor of wind turbine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a connection method between the main beam and the core material of a wind turbine blade of the present invention;

[0020] Figure 2 It is a structural schematic diagram of another embodiment of the connection method between the main beam and the core material of the wind turbine blade of the present invention. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0022] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0023] Those skilled in the art will appreciate that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0024] The present invention provides an embodiment of a wind turbine blade, such as Figure 1 , Figure 2 As shown, it includes a main beam 1 (or 1') and a core material 2 (or 2') connected to the main beam 1 (or 1'), and the main beam 1 (or 1') and the core material 2 (or 2') are concave-convexly connected.

[0025] When the present invention is used, the main beam and the core material are connected in a concave-convex manner, which can improve the rigidity of the intersection area between the core material and the main beam; reduce the probability of damage in the intersection area between the core material and the main beam; and improve the stability of the wind turbine blade structure and the safety factor of the wind turbine operation. The problem that the connection between the core material and the main beam becomes a structural weak point and is easily damaged due to the vertical docking method in the prior art is solved. The present invention can improve the stability of this part of the area through the contact method of the concave-convex connection, thereby making the blade structure more stable.

[0026] In the prior art, the core material of a large blade and the main beam and the trailing edge beam are generally connected by vertical butt joint, which makes the connection point a structural weak point and usually also an area that is susceptible to damage.

[0027] Aiming at the weak points of the current wind turbine blade structure, the present invention proposes a new contact form between the core material and the main beam and the trailing edge beam - a concave-convex connection, which can improve the rigidity of the intersection area between the core material and the main beam and the trailing edge beam; reduce the probability of damage to the intersection area between the core material and the main beam and the trailing edge beam; and improve the stability of the wind turbine blade structure and the safety factor of wind turbine operation.

[0028] As a preferred solution, the trailing edge beam is also connected to the core material in a concave-convex manner.

[0029] If there is a gap between the main beam and the core material, or between the trailing edge beam and the core material, the gap can be filled with dry yarn. The main beam and the core material, the trailing edge beam and the core material are poured integrally by sequentially laying them on the blade shell.

[0030] The implementation method of the concave-convex connection is generally as follows: the main beam and the trailing edge beam are prefabricated with specific boundary shapes (which can be sharp corners or convex corners), the core material is cut at an angle into matching boundary shapes, and laid in the blade shell in sequence. If there are gaps, they can be filled with dry yarn, and then they are cast as a whole.

[0031] As an example, Figure 1 As shown, both ends of the main beam 1 may be convex corners, and the connection between the core material 2 and the main beam 1 is a groove that matches the convex corners. Further, the slope of the convex corners is less than 1:5. The slope can refer to the DNV-GL2015 blade design specification.

[0032] Correspondingly, both ends of the trailing edge beam may also be convex corners, and the connection between the core material and the trailing edge beam is a groove that matches the convex corners.

[0033] As another embodiment, grooves are provided at both ends of the main beam 1', and the connection between the core material 2' and the main beam 1' is a convex angle matched with the groove. Further, the convex angle is an oblique angle, and the efficiency of the oblique angle is less than 1:5. The slope can refer to the DNV-GL2015 blade design specification.

[0034] Correspondingly, grooves may also be provided at both ends of the trailing edge beam, and the connection between the core material and the trailing edge beam is a convex angle that matches the grooves.

[0035] The concave-convex connection mode between the main beam and the core material, and the concave-convex connection mode between the trailing edge beam and the core material are not limited to the above-mentioned concave-convex connection mode, for example, a zigzag concave-convex connection mode and the like.

[0036] On the other hand, a wind turbine is provided, comprising the wind turbine blade.

[0037] The main beam and / or trailing edge beam of the present invention adopts a concave-convex connection contact mode with the core material, thereby improving the stability of the blade structure. This solves the problem in the prior art that the connection between the core material and the main beam becomes a structural weak point and is easily damaged due to the vertical docking mode. The concave-convex connection contact mode provided by the present invention can improve the stability of this part of the area, thereby making the blade structure more stable.

[0038] Aiming at the weak points of the current wind turbine blade structure, the present invention proposes a new contact form between the core material and the main beam and the trailing edge beam - a concave-convex connection, which can improve the rigidity of the intersection area between the core material and the main beam and the trailing edge beam; reduce the probability of damage to the intersection area between the core material and the main beam and the trailing edge beam; and improve the stability of the wind turbine blade structure and the safety factor of wind turbine operation.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which all fall within the protection scope of the present invention.

Claims

1. A wind turbine blade, comprising a main beam and a core material connected to the main beam, characterized in that: The main beam and the core material are connected in a concave-convex manner; Both ends of the main beam are convex corners, and the connection between the core material and the main beam is a groove that matches the convex corners; Alternatively, grooves are provided at both ends of the main beam, and the connection between the core material and the main beam is a convex angle that matches the grooves.

2. The wind turbine blade according to claim 1, characterized in that: The bevel slope of the convex corner is less than 1:

5.

3. The wind turbine blade according to claim 1, characterized in that: The convex angle is an oblique angle, and the slope of the oblique angle is less than 1:

5.

4. The wind turbine blade according to claim 1, characterized in that: The gap between the main beam and the core material is filled with dry yarn.

5. The wind turbine blade according to any one of claims 1 to 4, characterized in that: The main beam and the core material are laid on the blade shell in sequence and integrally cast by injection.

6. The wind turbine blade according to any one of claims 1 to 4, characterized in that: It also includes a rear edge beam, and the rear edge beam is connected to the core material in a concave-convex manner.

7. The wind turbine blade according to claim 6, characterized in that: Both ends of the trailing edge beam are convex corners, and the connection between the core material and the trailing edge beam is a groove that matches the convex corners; Alternatively, grooves are provided at both ends of the trailing edge beam, and the connection between the core material and the trailing edge beam is a convex angle that matches the grooves.

8. A wind turbine, characterized in that: It comprises the wind turbine blade according to any one of claims 1 to 7.

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