Blade structure and wind turbine

Abstract

This invention provides a blade structure and a wind turbine. The blade structure includes: a shell having an outer skin; a beam cap disposed on the surface of the outer skin, the beam cap having a first side away from the outer skin and a second side facing the outer skin at its end, the first side having a bevel forming a pointed tip at the end of the beam cap; and a reinforcing layer disposed at the end of the beam cap, with reinforcing layers disposed on both the first and second side surfaces, the end of the beam cap being connected to the outer skin via the reinforcing layer. This invention solves the problem of easy cracking of the blade beam cap layer in the prior art.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and more specifically, to a blade structure and a wind turbine generator. Background Technology

[0002] For wind turbine blades, the structure generally includes a shell, a beam cap, and a web. The web is located inside the shell and is connected to the shell by the beam cap. Traditionally, the beam cap on a blade is usually pointed at the end. However, due to the rapid transition in thickness at the end of the pultruded beam cap, local stress concentration can easily occur, which can lead to cracking of the beam cap layer, resulting in structural damage to the blade and affecting its quality and lifespan. Summary of the Invention

[0003] The main objective of this invention is to provide a blade structure and a wind turbine generator to solve the problem of easy cracking of the blade beam cap layer in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a blade structure is provided, comprising: a shell portion having an outer skin; a beam cap disposed on the surface of the outer skin, the end of the beam cap having a first side away from the outer skin and a second side facing the outer skin, the first side having a bevel, the bevel forming a tip at the end of the beam cap; and a reinforcing layer disposed at the end of the beam cap, the reinforcing layer being disposed on both the first and second side surfaces, the end of the beam cap being connected to the outer skin via the reinforcing layer.

[0005] Furthermore, the reinforcing layer includes a first reinforcing layer and a second reinforcing layer, with the first reinforcing layer located on a first side and the second reinforcing layer located on a second side. The first and second reinforcing layers are connected to each other and to the outer skin by impregnation with resin.

[0006] Furthermore, the first reinforcing layer includes a first bonding section and a first extension section. The first bonding section is bonded to the first side surface, and the first extension section is connected to the first bonding section and extends along the outer skin surface in a direction away from the beam cap. The second reinforcing layer includes a second bonding section and a second extension section. The second bonding section is located on the second side surface and is bonded to the second side surface and the outer skin. The second extension section is connected to the second bonding section and extends along the outer skin surface in a direction away from the beam cap. The first extension section and the second extension section are stacked and bonded together.

[0007] Furthermore, the reinforcing layer also includes sutures, and the first and second bonding segments are sutured together by the sutures.

[0008] Furthermore, the reinforcing layer is a fiber cloth, which is bonded to the beam cap and outer skin by impregnation with resin.

[0009] Furthermore, the beam cap includes a first segment and a second segment that are bent and connected in sequence. The first segment extends along the surface of the outer skin, and the second segment forms an angle with the surface of the outer skin. The end of the first segment away from the second segment has a first side and a second side.

[0010] Furthermore, the blade structure also includes a web, which is connected to the second section, and the web forms an angle with the length direction of the shell.

[0011] Furthermore, the first segment is a single beam cap with an L-shaped structure.

[0012] Furthermore, the first segment consists of multiple segments, and the end of the second segment near the outer skin is connected to multiple first segments simultaneously. The first segments extend away from each other, and the beam cap has a T-shaped structure.

[0013] According to another aspect of the present invention, a wind turbine is provided, comprising the blade structure described above.

[0014] By applying the technical solution of this invention, a reinforcing layer is provided at the tip of the beam cap, and the reinforcing layer is provided on both the inclined surface of the first side of the tip and the surface of the second side of the tip. This allows the tip of the beam cap to be covered by the reinforcing layer, and the reinforcing layer is connected to the outer skin of the shell by impregnation with resin. In this way, when the beam cap is under stress, the reinforcing layer can play a role in sharing the load, distributing the force borne by the beam cap to the outer skin through the reinforcing layer. This avoids the beam cap from delamination and breakage under load, ensuring that the safety performance of the beam cap meets the requirements when the blade structure is in use, and improving the overall structural strength of the blade structure. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 A schematic diagram of the blade structure of the present invention at the tip of the beam cap is shown.

[0017] The above figures include the following reference numerals:

[0018] 10. Shell section; 20. Beam cap; 21. First side; 22. Second side; 31. First reinforcing layer; 311. First bonding section; 312. First extension section; 32. Second reinforcing layer; 321. Second bonding section; 322. Second extension section. Detailed Implementation

[0019] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0022] To address the problem of easy cracking of the blade beam cap layer in existing technologies, this invention provides a blade structure and a wind turbine generator.

[0023] like Figure 1 The blade structure shown includes a shell portion 10, a beam cap 20, and a reinforcing layer. The shell portion 10 has an outer skin. The beam cap 20 is disposed on the surface of the outer skin. The end of the beam cap 20 has a first side 21 away from the outer skin and a second side 22 facing the outer skin. The first side 21 has a bevel, which forms a tip at the end of the beam cap 20. The reinforcing layer is disposed at the end of the beam cap 20. The reinforcing layer is disposed on both the surface of the first side 21 and the surface of the second side 22. The end of the beam cap 20 is connected to the outer skin through the reinforcing layer.

[0024] In this embodiment, a reinforcing layer is provided at the tip of the beam cap 20, and the reinforcing layer is provided on both the inclined surface of the first side 21 and the surface of the second side 22 of the tip. This allows the tip of the beam cap 20 to be covered by the reinforcing layer, and the reinforcing layer is connected to the outer skin of the shell 10 by impregnation with resin. In this way, when the beam cap 20 is under stress, the reinforcing layer can play a role in sharing the load, distributing the force borne by the beam cap 20 to the outer skin through the reinforcing layer. This avoids the beam cap 20 from delamination and breakage under load, ensuring that the safety performance of the beam cap 20 meets the requirements when the blade structure is in use, and improving the overall structural strength of the blade structure.

[0025] The first side 21 mentioned in this embodiment is... Figure 1 The upper side of the beam cap 20, and the second side 22 is the lower side of the beam cap 20.

[0026] In this embodiment, two reinforcing layers are provided, including a first reinforcing layer 31 and a second reinforcing layer 32. The first reinforcing layer 31 is located on the first side 21 and is bonded to the inclined surface of the first side 21. The second reinforcing layer 32 is located on the second side 22 and serves as an intermediate component connecting the second side 22 and the outer skin, allowing the second side 22 to be connected to the outer skin via the second reinforcing layer 32. The first reinforcing layer 31 and the second reinforcing layer 32 are connected to each other, and the second reinforcing layer 32 is connected to the outer skin via resin impregnation. During connection, after the first reinforcing layer 31 and the second reinforcing layer 32 are placed, resin is impregnated onto the two reinforcing layers, or the two reinforcing layers are soaked in resin separately before placement. After a certain period of time, the resin solidifies, allowing the two reinforcing layers to connect with the tip of the beam cap 20 and the outer skin, thereby enhancing the connection strength between the tip of the beam cap 20 and the outer skin and distributing the load of the beam cap 20.

[0027] Of course, the number of reinforcing layers is not limited to the method described in this embodiment. More reinforcing layers can be set, and the specific position of the reinforcing layers can also be adjusted as needed, as long as the first side 21 and the second side 22 are both provided with reinforcing layers for connection and load sharing.

[0028] In this embodiment, the first reinforcing layer 31 includes a first bonding section 311 and a first extension section 312. The first bonding section 311 is bonded to the surface of the first side 21, and the first extension section 312 is connected to the first bonding section 311 and extends along the surface of the outer skin in a direction away from the beam cap 20. That is, the area of ​​the first reinforcing layer 31 is relatively large. A part of the first reinforcing layer 31 covers and is bonded to the surface of the first side 21, while another part is not bonded to the first side 21 or to other positions of the beam cap 20, but extends out from the tip to form the first extension section 312. Similarly, the second reinforcing layer 32 includes a second bonding section 321 and a second extension section 322. The second bonding section 321 is located on the surface of the second side 22 and is bonded to the surface of the second side 22 and the outer skin. The second extension section 322 is connected to the second bonding section 321 and extends along the surface of the outer skin in a direction away from the beam cap 20. The arrangement of the second reinforcing layer 32 is basically similar to that of the first reinforcing layer 31. Only a part of it is bonded to the second side 22, and the other part extends out from the tip to form the second extension section 322. Since the first extension section 312 of the first reinforcing layer 31 and the second extension section 322 of the second reinforcing layer 32 both extend out from the tip, they are stacked and bonded together. The first extension section 312 and the second extension section 322 are also connected by impregnation with resin. In this way, the reinforcing layer forms a whole, ensuring the connection and load sharing effect on both sides of the tip of the beam cap 20.

[0029] In this embodiment, in addition to being connected by resin impregnation, the first extension segment 312 and the second extension segment 322 are also connected by sutures. Specifically, the reinforcing layer also includes sutures, and the first bonding segment 311 and the second bonding segment 321 are sutured together. The suture connection can be performed before the resin is fixed between the first extension segment 312 and the second extension segment 322, thus both pre-fixing the first extension segment 312 and the second extension segment 322 with sutures and enhancing the fixing connection effect, ensuring the stability and reliability of the connection between the first extension segment 312 and the second extension segment 322.

[0030] Preferably, the reinforcing layer in this embodiment is made of fiber cloth, which can be bonded to the beam cap 20 and the outer skin by impregnation with resin. Of course, the reinforcing layer can also adopt other structures as needed, as long as it can achieve the connection and fixation between the beam cap 20 and the outer skin.

[0031] In this embodiment, the beam cap 20 includes a first segment and a second segment that are bent and connected in sequence. The first segment extends along the surface of the outer skin, thereby fitting against the surface of the outer skin. Due to the bending connection between the first and second segments, an angle is formed between the second segment and the surface of the outer skin. The second segment is used to connect with other components of the blade structure. The end of the first segment away from the second segment is the free end of the beam cap 20 that mates with the outer skin. This free end is a pointed tip and has the aforementioned first side 21 and second side 22.

[0032] The blade structure of this embodiment also includes a web, which is connected to the second segment and forms an angle with the length direction of the shell 10. The two ends of the shell 10 are the blade root and the blade tip, respectively, and its length direction is from the blade root to the blade tip. In this embodiment, the web forms an angle with the length direction, that is, the surface of the web does not extend along the length direction, so that the web can provide reliable support for the shell 10 and improve the blade's resistance to instability.

[0033] Optionally, the number of first segments can be set as needed, either one or more. When there is only one first segment, the first segment and the second segment are naturally bent and connected, resulting in an L-shaped structure for the beam cap 20. When there are multiple first segments, since the first segments need to fit snugly against the outer skin, each first segment is located at the end of the second segment closest to the outer skin. That is, the end of the second segment closest to the outer skin is connected to multiple first segments simultaneously, so that the first segments at the same end of the second segment can fit against the outer skin at the same time. To ensure the reliability of the fit between the beam cap 20 and the outer skin, this embodiment uses first segments that extend away from each other. Taking two first segments as an example, the two first segments are located on opposite sides of the surface of the second segment, resulting in a T-shaped structure for the beam cap 20. This increases the area that the beam cap 20 can fit against the outer skin, ensuring the reliability of the connection between the beam cap 20 and the outer skin. Since there are two first segments, both first segments have sharp points. Reinforcing layers can be provided at the sharp points of both first segments to ensure that the sharp points of both first segments are reliable and stable. Of course, when there are more first segments, the number of enhancement layers can be further increased as needed, just enough to match the number of tips in the first segment.

[0034] This embodiment also provides a wind turbine generator, including a wind turbine base and the aforementioned blade structure. Multiple blade structures are provided, spaced circumferentially along the wind turbine base, thereby forming the rotating power generation part of the wind turbine.

[0035] It should be noted that "multiple" in the above embodiments refers to at least two.

[0036] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0037] 1. This solves the problem of easy cracking of the blade beam cap plate in existing technologies;

[0038] 2. To prevent the beam cap from delaminating and breaking under load, ensure that the safety performance of the beam cap meets the requirements when the blade structure is in use, and improve the overall structural strength of the blade structure.

[0039] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A blade structure, characterized in that, include: Shell portion (10), said shell portion (10) having an outer skin; Beam cap (20), the beam cap (20) is disposed on the surface of the outer skin, the end of the beam cap (20) has a first side (21) away from the outer skin and a second side (22) towards the outer skin, the first side (21) has a bevel, the bevel forms a tip at the end of the beam cap (20); A reinforcing layer is provided at the end of the beam cap (20). The reinforcing layer is provided on the surface of the first side (21) and the surface of the second side (22). The end of the beam cap (20) is connected to the outer skin through the reinforcing layer. The beam cap (20) includes a first segment and a second segment that are bent and connected in sequence. The first segment extends along the surface of the outer skin, and the second segment forms an angle with the surface of the outer skin. The end of the first segment away from the second segment has a first side (21) and a second side (22). The blade structure also includes a web, which is connected to the second segment, and the web forms an angle with the length direction of the shell (10).

2. The blade structure according to claim 1, characterized in that, The reinforcing layer includes a first reinforcing layer (31) and a second reinforcing layer (32). The first reinforcing layer (31) is located on the first side (21), and the second reinforcing layer (32) is located on the second side (22). The first reinforcing layer (31) and the second reinforcing layer (32), as well as the second reinforcing layer (32) and the outer skin, are connected by impregnation resin.

3. The blade structure according to claim 2, characterized in that, The first reinforcing layer (31) includes a first bonding section (311) and a first extension section (312). The first bonding section (311) is bonded to the surface of the first side (21). The first extension section (312) is connected to the first bonding section (311) and extends along the surface of the outer skin in a direction away from the beam cap (20). The second reinforcing layer (32) includes a second bonding section (321) and a second extension section (322). The second bonding section (321) is located on the surface of the second side (22) and is bonded to the surface of the second side (22) and the outer skin. The second extension section (322) is connected to the second bonding section (321) and extends along the surface of the outer skin in a direction away from the beam cap (20). The first extension section (312) and the second extension section (322) are stacked and bonded together.

4. The blade structure according to claim 3, characterized in that, The reinforcing layer also includes a suture, through which the first extension segment (312) and the second extension segment (322) are sutured together.

5. The blade structure according to claim 1, characterized in that, The reinforcing layer is a fiber cloth, which is bonded to the beam cap (20) and the outer skin by impregnation with resin.

6. The blade structure according to claim 1, characterized in that, The first segment is one, and the beam cap (20) has an L-shaped structure.

7. The blade structure according to claim 1, characterized in that, The first segment is multiple, and the second segment is connected to multiple first segments at one end near the outer skin. The first segments extend away from each other, and the beam cap (20) has a T-shaped structure.

8. A wind turbine generator, characterized in that, The blade structure includes any one of claims 1 to 7.

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