Blade structure and wind driven generator

Abstract

The invention provides a blade structure and a wind driven generator. The blade structure comprises a shell part and a blade part, and the shell part is provided with an outer skin; the beam cap is arranged on the surface of the outer skin, the end of the beam cap is provided with a first side away from the outer skin and a second side facing the outer skin, the first side is provided with an inclined plane, and the inclined plane forms a tip at the end of the beam cap; the reinforcing layers are arranged at the ends of the beam cap, the first side surface and the second side surface are both provided with the reinforcing layers, and the ends of the beam cap are connected with the outer skin through the reinforcing layers. The problem that in the prior art, a blade beam cap laminate is prone to cracking is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to a blade structure and a wind turbine generator. Background Art

[0002] The blades of a wind turbine generally include a shell, a spar cap and a web, wherein the web is arranged in the shell and connected to the shell through the spar cap. The spar cap on a traditional blade generally has a tip at the end, but the local stress concentration caused by the rapid thickness transition of the pultruded spar cap at the end can easily cause cracking of the spar cap layer, resulting in damage to the blade structure and affecting the quality and life of the blade. Summary of the invention

[0003] The main purpose of the present invention is to provide a blade structure and a wind turbine generator to solve the problem that the blade beam cap layer plate is easy to crack in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a blade structure, comprising: a shell portion, the shell portion having an outer skin; a spar cap, the spar cap being arranged on the surface of the outer skin, the end of the spar cap having a first side away from the outer skin and a second side facing the outer skin, the first side having an inclined surface, the inclined surface forming a tip at the end of the spar cap; a reinforcement layer, the reinforcement layer being arranged at the end of the spar cap, the reinforcement layer being arranged on the first side surface and the second side surface, and the end of the spar cap being connected to the outer skin through the reinforcement layer.

[0005] Furthermore, the reinforcement layer includes a first reinforcement layer and a second reinforcement layer, the first reinforcement layer is located on the first side, the second reinforcement layer is located on the second side, and the first reinforcement layer and the second reinforcement layer and the outer skin are connected by impregnation resin.

[0006] Furthermore, the first reinforcement layer includes a first fitting section and a first extension section, the first fitting section is fitted with the first side surface, the first extension section is connected to the first fitting section and extends along the outer skin surface in a direction away from the spar cap, the second reinforcement layer includes a second fitting section and a second extension section, the second fitting section is located on the second side surface and is fitted with the second side surface and the outer skin, the second extension section is connected to the second fitting section and extends along the outer skin surface in a direction away from the spar cap, and the first extension section and the second extension section are overlapped and fitted.

[0007] Furthermore, the reinforcing layer also includes a suture line, and the first fitting section and the second fitting section are sutured and connected by the suture line.

[0008] Furthermore, the reinforcement layer is a fiber cloth, and the fiber cloth is bonded and connected to the spar cap and the outer skin by impregnation with resin.

[0009] Furthermore, the spar cap includes a first section and a second section connected by sequential bending, the first section extends along the surface of the outer skin, the second section forms an angle with the surface of the outer skin, and an end of the first section away from the second section 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 an angle is formed between the web and the length direction of the shell.

[0011] Furthermore, the first section is one, and the beam cap is an L-shaped structure.

[0012] Furthermore, there are multiple first sections, one end of the second section close to the outer skin is connected to multiple first sections at the same time, and the first sections 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 above-mentioned blade structure.

[0014] By applying the technical solution of the present invention, a reinforcement layer is provided at the tip of the spar cap, and the reinforcement layer is provided at the inclined surface of the first side of the tip and at the second side surface of the tip, so that the tip of the spar cap is covered by the reinforcement layer, and the reinforcement layer is connected to the outer skin of the shell by means of resin impregnation. In this way, when the spar cap is subjected to force, the reinforcement layer can play a role in sharing the load, and the force borne by the spar cap is shared to the outer skin through the reinforcement layer, thereby avoiding delamination and fracture of the spar cap when subjected to load, ensuring that the safety performance of the spar cap meets the requirements when the blade structure is used, and improving the overall structural strength of the blade structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

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

[0018] 10. Shell; 20. Spar cap; 21. First side; 22. Second side; 31. First reinforcement layer; 311. First fitting section; 312. First extension section; 32. Second reinforcement layer; 321. Second fitting section; 322. Second extension section. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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 meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0021] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0022] In order to solve the problem that blade spar cap layers are prone to cracking in the prior art, the present invention provides a blade structure and a wind turbine.

[0023] like Figure 1 A blade structure shown includes a shell 10, a spar cap 20 and a reinforcement layer, wherein the shell 10 has an outer skin; the spar cap 20 is arranged on the surface of the outer skin, and the end of the spar cap 20 has a first side 21 away from the outer skin and a second side 22 facing the outer skin, and the first side 21 has an inclined surface, and the inclined surface forms a tip at the end of the spar cap 20; the reinforcement layer is arranged at the end of the spar cap 20, and the surfaces of the first side 21 and the second side 22 are both provided with reinforcement layers, and the end of the spar cap 20 is connected to the outer skin through the reinforcement layer.

[0024] In this embodiment, a reinforcement layer is provided at the tip of the spar cap 20, and the reinforcement layer is provided at the inclined surface of the first side 21 of the tip and the surface of the second side 22 of the tip, so that the tip of the spar cap 20 is covered by the reinforcement layer, and the reinforcement layer is connected to the outer skin of the shell 10 by means of resin impregnation. In this way, when the spar cap 20 is subjected to force, the reinforcement layer can play a role in sharing the load, and the force borne by the spar cap 20 is shared to the outer skin through the reinforcement layer, thereby avoiding delamination and fracture of the spar cap 20 when subjected to load, ensuring that the safety performance of the spar cap 20 meets the requirements when the blade structure is used, and improving the overall structural strength of the blade structure.

[0025] The first side 21 mentioned in this embodiment is Figure 1 The second side 22 is 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 reinforcement layers are provided, and include a first reinforcement layer 31 and a second reinforcement layer 32, wherein the first reinforcement layer 31 is located on the first side 21, and the first reinforcement layer 31 is connected to the inclined surface of the first side 21 by being fitted, and the second reinforcement layer 32 is located on the second side 22, and the second reinforcement layer 32 is used as an intermediate component connected between the second side 22 and the outer skin, so that the second side 22 can be connected to the outer skin through the second reinforcement layer 32. The first reinforcement layer 31 and the second reinforcement layer 32, and the second reinforcement layer 32 and the outer skin are connected by impregnation resin. When connecting, after the first reinforcement layer 31 and the second reinforcement layer 32 are placed, the resin is impregnated on the two reinforcement layers, or the two reinforcement layers are immersed in the resin before placement and then placed. After a period of time, the resin solidifies, so that the two reinforcement layers are connected to the tip of the spar cap 20 and the outer skin, thereby enhancing the connection strength between the tip of the spar cap 20 and the outer skin and sharing the load of the spar cap 20.

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

[0028] In this embodiment, the first reinforcement 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 spar cap 20. In other words, the area of ​​the first reinforcement layer 31 is relatively large, a part of the first reinforcement layer 31 covers and bonds to the surface of the first side 21, and the other part is not bonded to the first side 21, nor to other positions of the spar cap 20, but extends from the tip to form the first extension section 312. Similarly, the second reinforcement layer 32 includes a second fitting section 321 and a second extension section 322. The second fitting section 321 is located on the surface of the second side 22 and is fitted with the surface of the second side 22 and the outer skin. The second extension section 322 is connected to the second fitting section 321 and extends along the surface of the outer skin in a direction away from the spar cap 20. The second reinforcement layer 32 is arranged in a manner similar to that of the first reinforcement layer 31. Only a portion of the second reinforcement layer 32 is fitted on the second side 22, and the other portion extends from the tip to form the second extension section 322. The first extension section 312 of the first reinforcement layer 31 and the second extension section 322 of the second reinforcement layer 32 are both extended from the tip, so they are overlapped and fitted. The first extension section 312 and the second extension section 322 are also connected by impregnation with resin. In this way, the reinforcement layer forms a whole, ensuring the connection and load sharing effect on both sides of the tip of the spar cap 20.

[0029] In this embodiment, the first extension section 312 and the second extension section 322 are connected by sutures in addition to being connected by impregnation with resin. Specifically, the reinforcing layer further includes sutures, and the first fitting section 311 and the second fitting section 321 are sutured and connected by sutures. The connection of the sutures can be made before the resin fixation between the first extension section 312 and the second extension section 322, so that the sutures can be used to pre-fix the first extension section 312 and the second extension section 322, and the sutures can also play a role in enhancing the fixed connection effect, thereby ensuring that the connection between the first extension section 312 and the second extension section 322 is stable and reliable.

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

[0031] In this embodiment, the spar cap 20 includes a first section and a second section that are bent and connected in sequence. The first section extends along the surface of the outer skin so that it can be attached to the surface of the outer skin. Since the first section and the second section are bent and connected, an angle is formed between the second section and the surface of the outer skin, and the second section is used to connect with other components of the blade structure. The end of the first section away from the second section is the free end of the spar cap 20 that cooperates with the outer skin. The free end is a pointed end, which has the above-mentioned first side 21 and second side 22.

[0032] The blade structure of this embodiment further includes a web, which is connected to the second section, and forms an angle between the web and the length direction of the shell 10. The two ends of the shell 10 are the blade root and the blade tip, respectively, and the length direction is the direction from the blade root to the blade tip. The web of this embodiment 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 anti-instability capability of the blade.

[0033] Optionally, the number of the first sections can be set as needed, and one or more sections can be set. When the first section is set to one, the first section and the second section are naturally bent and connected, so that the beam cap 20 has an L-shaped structure. When there are multiple first sections, since the first section needs to fit with the outer skin, the first sections are all set at one end of the second section close to the outer skin, that is, the end of the second section close to the outer skin is connected to multiple first sections at the same time, so that the first section at the same end of the second section can fit with the outer skin at the same time. At the same time, in order to ensure the reliability of the fit between the beam cap 20 and the outer skin, this embodiment adopts the direction of extending away from each other between each first section. Taking the setting of two first sections as an example, the two first sections are respectively located on the opposite sides of the surface of the second section, so that the beam cap 20 has a T-shaped structure, thereby increasing the area that can fit between the beam cap 20 and the outer skin, and ensuring the reliability of the connection between the beam cap 20 and the outer skin. At this time, since there are two first sections, the two first sections have tips. At this time, a reinforcement layer can be set at the tips of the two first sections to ensure that the tips of the two first sections are reliable and stable. Of course, when there are more first sections, the number of reinforcement layers can be further increased as needed to match the number of the tips of the first sections.

[0034] This embodiment also provides a wind turbine generator, comprising a wind turbine base and the above blade structure. A plurality of blade structures are provided, and the blade structures are arranged on the wind turbine base at intervals along the circumference of the wind turbine base, thereby forming a rotating power generation part of the wind turbine.

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

[0036] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0037] 1. Solve the problem of easy cracking of blade beam cap layer in the prior art;

[0038] 2. Avoid delamination and fracture of the beam cap when it is loaded, 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 above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blade structure, characterized in that: include: A shell (10), wherein the shell (10) has an outer skin; A spar cap (20), the spar cap (20) being arranged on the surface of the outer skin, the end of the spar cap (20) having a first side (21) away from the outer skin and a second side (22) facing the outer skin, the first side (21) having an inclined surface, the inclined surface forming a tip at the end of the spar cap (20); A reinforcing layer is arranged at an end of the spar cap (20), the reinforcing layer is arranged on the surface of the first side (21) and the surface of the second side (22), and the end of the spar cap (20) is connected to the outer skin through the reinforcing layer.

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

3. The blade structure according to claim 2, characterized in that: The first reinforcement layer (31) comprises 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 spar cap (20), the second reinforcement layer (32) comprises 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 spar cap (20), and the first extension section (312) and the second extension section (322) are overlapped and bonded.

4. The blade structure according to claim 3, characterized in that: The reinforcing layer further comprises a suture line, and the first fitting section (311) and the second fitting section (321) are sutured and connected via the suture line.

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

6. The blade structure according to claim 1, characterized in that: The spar cap (20) comprises a first section and a second section connected by bending in sequence, the first section extends along the surface of the outer skin, the second section forms an angle with the surface of the outer skin, and an end of the first section away from the second section has the first side (21) and the second side (22).

7. The blade structure according to claim 6, characterized in that: The blade structure also includes a web, which is connected to the second section, and an angle is formed between the web and the length direction of the shell (10).

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

9. The blade structure according to claim 6, characterized in that: There are a plurality of first sections, one end of the second section close to the outer skin is simultaneously connected to a plurality of the first sections, and the first sections extend in directions away from each other, and the spar cap (20) is in a T-shaped structure.

10. A wind turbine generator, characterized in that: The blade structure comprises the blade structure according to any one of claims 1 to 9.

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