Prefabricated part for main beam of fan blade

Abstract

The utility model relates to the technical field of optical fiber sensing technology and wind power blades, in particular to a fan blade main beam prefabricated part which comprises an optical fiber grating array, the optical fiber grating array is bonded with a plurality of fiber reinforced composite material bundles through epoxy resin, and the optical fiber grating array is located in the middle of the fiber reinforced composite material bundles. Tail fibers are arranged in the multiple fiber reinforced composite material bundles, the tail ends of the multiple fiber reinforced composite material bundles are fixedly connected with an optical fiber protection tube, the tail fibers extend into the optical fiber protection tube and are connected with the optical fiber protection tube in an inserted mode, and the tail end of the optical fiber protection tube is fixedly connected with an optical fiber connector. The fiber bragg grating array and the plurality of fiber reinforced composite material bundles are matched for use, so that the fan blade main beam prefabricated part with the embedded fiber bragg grating array can be integrally embedded into a blade root, the deformation of the blade main beam can be directly measured, and the measurement reliability and stability are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine blade technology, specifically to a prefabricated main beam component for wind turbine blades. Background Technology

[0002] With the development of new energy sources, wind energy has become more widespread, and wind power generation has become one of the important energy sources. To improve the efficiency and performance of wind turbine blades, they are developing towards larger size, lighter weight, and higher reliability. However, the excessively large blade structure places higher demands on the blade's main sparsity. The main sparsity of a wind turbine blade is the core supporting structure of the blade, responsible for bearing the main loads generated by the blade under wind force, providing the necessary stiffness and strength to ensure the stability and reliability of the blade during long-term operation. The main sparsity is the main load-bearing structure in a wind turbine blade, accounting for more than 21% of the total blade mass and providing 90% of the flapping stiffness. Therefore, the safety and reliability of the main sparsity structure has a very important impact on the blade.

[0003] Existing fiber optic sensing technology and wind turbine blade technology still have certain shortcomings. To save costs and improve production efficiency, pultruded main beam prefabricated components are increasingly being used in blade production. Pultruded sheets have higher mechanical strength than traditional main beams of the same volume, resulting in lighter blades under the same mechanical requirements. Currently, the main monitoring method for the main beam structure involves attaching strain sensors to the blade cavity through a layer of fiberglass cloth after blade forming, rather than directly monitoring the deformation of the main beam structure. Utility Model Content

[0004] The purpose of this invention is to provide a prefabricated main beam component for wind turbine blades and its manufacturing method, addressing the issue mentioned in the background art where pultrusion-produced main beam prefabricated components are increasingly used in blade production to save costs and improve production efficiency. Pultruded sheets have higher mechanical strength than traditional main beams of the same volume, resulting in lighter blades under the same mechanical requirements. Currently, monitoring methods for the main beam structure primarily involve attaching strain sensors to the blade cavity through a layer of fiberglass cloth after blade molding, which fails to directly monitor the deformation of the main beam structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A prefabricated component for a wind turbine blade main beam includes a fiber optic grating array. The fiber optic grating array is bonded to multiple fiber-reinforced composite material bundles via epoxy resin. The fiber optic grating array is located in the middle of the multiple fiber-reinforced composite material bundles. Pigtails are disposed within the multiple fiber-reinforced composite material bundles. An optical fiber protection tube is fixedly connected to the end of the multiple fiber-reinforced composite material bundles. The pigtails extend into the optical fiber protection tubes and are inserted into the optical fiber protection tubes. An optical fiber connector is fixedly connected to the end of the optical fiber protection tubes.

[0007] As a preferred embodiment of this utility model, the fiber grating array can be directly inscribed by femtosecond laser or directly inscribed by ultraviolet laser without removing the fiber coating.

[0008] As a preferred embodiment of this utility model, the fiber gratings in the fiber grating array have different central reflection wavelengths, with a wavelength interval of more than 3 nm between them.

[0009] As a preferred embodiment of this utility model, the fiber grating array can be located in the upper half, middle, or lower half of the vertical cross-section of the wind turbine blade main beam prefabricated component in which the fiber grating array is implanted.

[0010] As a preferred embodiment of this utility model, the multiple fiber-reinforced composite material bundles can be made of glass fiber or carbon fiber.

[0011] As a preferred embodiment of this utility model, the optical fiber protection tube can be either a rubber tube or a plastic tube, with a diameter between 0.2 mm and 0.5 mm. The cross-section of the prefabricated main beam component of the wind turbine blade of the fiber grating array can be rectangular or circular.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, by setting up a fiber optic grating array and using multiple fiber-reinforced composite material bundles in combination, this wind turbine blade main beam prefabricated component with embedded fiber optic grating array can be embedded as a whole into the blade root, and the deformation of the blade main beam can be directly measured, greatly improving the reliability and stability of the measurement. The fiber optic grating array is embedded in the blade main beam prefabricated component in advance, which on the one hand reduces the possibility of the fiber optic grating array being damaged during the blade production process, and on the other hand also improves the production efficiency of the blade.

[0014] 2. In this utility model, by setting up a fiber optic grating array and a light protection tube for combined use, this fiber optic grating array has no breaks and does not require fiber optic splicing. Multiple fiber optic gratings can be deployed on a single fiber. This not only allows for the measurement of the deformation of the main beam at different locations, but also allows for the determination of whether there are cracks or breaks between two fiber optic grating measurement points on the main beam based on the relative power changes of the reflection peaks of the fiber optic gratings at different locations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0016] In the diagram: 1. Fiber Bragg grating array; 2. Pigtail; 3. Fiber protection tube; 4. Bundle of multiple fiber-reinforced composite materials; 5. Epoxy resin; 6. Fiber optic connector. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] For examples, please refer to Figure 1 This utility model provides a technical solution:

[0019] A prefabricated component for a wind turbine blade main beam includes a fiber grating array 1. The fiber grating array 1 is bonded to multiple fiber-reinforced composite material bundles 4 by epoxy resin 5. The fiber grating array 1 is located in the middle of the multiple fiber-reinforced composite material bundles 4. A pigtail 2 is provided inside the multiple fiber-reinforced composite material bundles 4. An optical fiber protection tube 3 is fixedly connected to the end of the multiple fiber-reinforced composite material bundles 4. The pigtail 2 extends into the optical fiber protection tube 3 and is inserted into the optical fiber protection tube 3. An optical fiber connector 6 is fixedly connected to the end of the optical fiber protection tube 3.

[0020] According to this embodiment Figure 1 As shown, a method for preparing a precast main beam for wind turbine blades includes the following steps:

[0021] Step 1: The fiber grating array consists of multiple fiber gratings, n≥2. The number of fiber gratings 1 and the spacing between them are determined by the monitoring requirements. The pigtail 2 is inserted into the fiber protection tube 3 and the fiber protection tube 3 is moved to the designated position. The fiber grating array 1 inside the fiber protection tube 3 is wound on the fiber winding shaft and installed on the fiber release frame. The wind turbine blade main beam pultrusion equipment is started. The multiple fiber reinforced composite material bundles 4 are introduced into the pultrusion mold after passing through the glue tank containing epoxy resin 5. After the existing curing process, the wind turbine blade main beam prefabricated part is pulled out.

[0022] Step 2: After the curing process is stable, the pigtail 2 is introduced into the appropriate position of the pultrusion mold, and the prefabricated wind turbine blade main beam with embedded fiber grating array 1 can be pultruded. When the fiber optic protective tube 3 enters the pultrusion mold, a mark is made on the prefabricated wind turbine blade main beam with embedded fiber grating array 1. The fiber gratings on the fiber grating array 1 enter the pultrusion mold in sequence until the pigtail on the other side is also completely entered into the pultrusion mold, and the pultrusion molding of the prefabricated wind turbine blade main beam with embedded fiber grating array 1 is completed. The prefabricated wind turbine blade main beam with embedded fiber grating array 1 is cut off at the designed position.

[0023] Step 3: Locate the position of the implanted fiber protection tube 3, cut a groove using existing technology, and peel the fiber protection tube 3 with the pigtail 2 through it from the bundle of multiple fiber-reinforced composite materials 4, and protect it with the tube. Connect the pigtail 2 to the fiber connector 6 using existing technology and take protective measures. The two ends of the prefabricated wind turbine blade main beam of this implanted fiber grating array 1 are trimmed and polished according to technical requirements.

[0024] The fiber grating array 1 can be directly inscribed by femtosecond laser or directly inscribed by ultraviolet laser without stripping the fiber coating. The center reflection wavelengths of the fiber gratings in the fiber grating array 1 are different, and the wavelength interval between them should preferably be greater than 3nm. The spacing between the fiber gratings in the fiber grating array 1 can be customized according to design requirements. The position of the fiber grating array 1 in the vertical section of the wind turbine blade main beam prefabricated component implanted with the fiber grating array 1 can be the upper half, middle, or lower half. The multiple fiber-reinforced composite material bundles 4 can be made of glass fiber or carbon fiber. The fiber protection tube 3 can be a rubber tube or a plastic tube, preferably with a diameter between 0.2mm and 0.5mm. The cross-section of the wind turbine blade main beam prefabricated component of the fiber grating array 1 can be rectangular or circular.

[0025] The working process of this utility model is as follows: When the wind turbine blade main beam prefabricated component designed in this scheme is in operation, this wind turbine blade main beam prefabricated component embedded in the fiber grating array 1 is embedded into the blade through existing technology, becoming an integral part of the blade. In this way, when the blade under test deforms, the deformation is transmitted to the corresponding fiber grating in the fiber grating array 1, causing the center reflection wavelength of the corresponding fiber grating to shift. By detecting the amount of shift of these center reflection wavelengths in the fiber grating array 1, the deformation information of different positions of the blade under test can be calculated.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated component for the main beam of a wind turbine blade, comprising a fiber optic grating array (1), characterized in that: The fiber grating array (1) is bonded to multiple fiber-reinforced composite material bundles (4) by epoxy resin (5). The fiber grating array (1) is located in the middle of the multiple fiber-reinforced composite material bundles (4). A pigtail (2) is provided inside the multiple fiber-reinforced composite material bundles (4). An optical fiber protection tube (3) is fixedly connected to the end of the multiple fiber-reinforced composite material bundles (4). The pigtail (2) extends into the optical fiber protection tube (3). The pigtail (2) is inserted into the optical fiber protection tube (3). An optical fiber connector (6) is fixedly connected to the end of the optical fiber protection tube (3).

2. The precast main beam component for wind turbine blades according to claim 1, characterized in that: The fiber grating array (1) is directly inscribed by femtosecond laser or directly inscribed by ultraviolet laser without removing the fiber coating.

3. A prefabricated main beam component for wind turbine blades according to claim 1, characterized in that: The fiber grating array (1) has different reflected wavelengths at the center of the fiber grating, with a wavelength interval of more than 3 nm between them.

4. A prefabricated main beam component for wind turbine blades according to claim 1, characterized in that: The fiber grating array (1) is located in the upper half, middle or lower half of the vertical section of the wind turbine blade main beam prefabricated component in which the fiber grating array (1) is embedded.

5. A prefabricated main beam component for wind turbine blades according to claim 1, characterized in that: The multi-fiber reinforced composite material bundle (4) is made of glass fiber or carbon fiber.

6. A precast wind turbine blade main beam according to claim 1, characterized in that: The fiber optic protection tube (3) is a type of rubber tube or plastic tube with a diameter between 0.2 mm and 0.5 mm. The cross-section of the precast main beam of the wind turbine blade of the fiber optic grating array (1) is rectangular or circular.

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