A blade connection attachment connecting device for a wind turbine

Abstract

The application provides a blade connecting accessory connecting device of a wind turbine, which takes into account strength, fatigue life and process convenience. The device comprises a blade, a metal angle steel, a blade connecting accessory and a glass fiber support; the glass fiber support is bonded to the inner cavity wall of the blade; the metal angle steel is fastened to the glass fiber support on one side through a bolt and is bonded to the glass fiber support by structural adhesive; and the blade accessory is fastened to the other side of the metal angle steel.

Description

Technical Field

[0001] This utility model relates to wind turbine blade manufacturing technology, specifically to a blade connection accessory connection device for wind turbine generator sets. Background Technology

[0002] As wind turbine blades become increasingly longer and more flexible, they face a growing number of design bottlenecks, such as blade flutter, tip sweeping, and aeroelastic stability. To address these issues, manufacturers are exploring the introduction of external accessories to assist blade operation, such as blade monitoring systems and blade sway dampers. The introduction of these new structures raises the question of how to install metal components like dampers, counterweights, and monitoring sensors within the blade's internal cavity.

[0003] Currently, there are two main methods for fixing metal parts such as dampers, counterweights, and monitoring sensors inside the blade cavity: 1) Metal parts and blades are directly bonded together with structural adhesive. The drawback of this bonding method is that the structural adhesive is prone to aging and cracking under long-term fatigue loads, resulting in poor reliability of the connection between the metal parts and blades.

[0004] 2) Metal parts and blades are directly connected by bolts. The drawback of this direct connection method is that local stress concentration is prone to occur at the connection point between the metal parts and the blades, which can cause peeling or cracking between the fiber layer and the matrix inside the blade. Summary of the Invention

[0005] To address the problems of poor connection reliability and easy peeling or cracking of the internal structure of the blade caused by unreasonable connection methods of metal parts and blades in the prior art, this application provides a blade connection accessory connection device for wind turbine generator sets.

[0006] The technical solution of this utility model is as follows: A blade connection accessory connection device for a wind turbine generator set includes: Blades, metal angle steel, blade connecting accessories, and fiberglass supports; the fiberglass supports are fixed to the inner wall of the blade. The blade connecting accessory is screwed to one side wall of the metal angle steel; The fiberglass support is screwed and bonded to the other side wall of the metal angle steel.

[0007] Preferably, the blade connection accessory includes at least one of a swing array damper, a counterweight, and a monitoring sensor.

[0008] Preferably, the metal angle steel includes a first angle steel plate and a second angle steel plate that are bent and connected. The first angle steel plate is locked to the blade connecting accessory by the first bolt; After the second angle steel plate is bonded to the fiberglass support with adhesive, it is then locked to the fiberglass support with a second bolt, so that the metal angle steel and the fiberglass support form a mixed adhesive-bolt connection.

[0009] Preferably, the fiberglass support is bonded to the inner wall of the blade by hand lay-up.

[0010] Preferably, the fiberglass support is pre-installed with a positioning sleeve during injection molding, and the central cavity of the positioning sleeve serves as the bolt hole for the installation of the second bolt.

[0011] Preferably, the metal angle steel has a strip-shaped hole, which serves as the bolt hole for installing the first bolt.

[0012] The beneficial effects of this utility model are as follows: The load of the blade connection accessory is first transferred to the metal angle steel, and then transferred to the fiberglass support through a hybrid connection of bolt pre-tightening and adhesive. Finally, it is diffused out through the bonding surface between the fiberglass support and the inner wall of the blade. This load path, with the help of the uniform distribution of shear deformation of the adhesive and the redundant constraint of the bolts, transforms the high-amplitude peel stress originally concentrated at the metal-composite interface into low-amplitude shear stress in the bonding surface of the support. This avoids the risk of local stress peaks and interlaminar cracking caused by direct hard contact between the metal angle steel and the inner wall of the blade, thus achieving safe and fatigue-resistant load transfer of the blade connection accessory, while retaining the removability of the bolts for convenient subsequent maintenance or replacement. Attached Figure Description

[0013] Figure 1 This is an assembly structure diagram of the metal angle steel, blade connecting accessories and fiberglass support in the embodiments of this application; Figure 2 This is an assembly structure diagram of the metal angle steel, blade connecting accessories and fiberglass support in the embodiments of this application. Detailed Implementation

[0014] Reference Figure 1 and Figure 2 This application provides a blade connection accessory connection device for a wind turbine generator set, including: a blade, a metal angle steel 1, a blade connection accessory 2, and a fiberglass support 3; the fiberglass support 3 is bonded to the inner wall of the blade; one side of the metal angle steel 1 is fastened to the fiberglass support 3 by bolts and bonded with structural adhesive; the blade accessory 2 is fastened to the other side of the metal angle steel 1.

[0015] Through this design, the load of the blade connection accessory 2 is first transferred to the metal angle steel 1, and then transferred to the fiberglass support 3 through a hybrid connection of bolt pre-tightening and adhesive. Finally, the load is diffused out through the bonding surface between the fiberglass support 3 and the inner wall of the blade. This load path, with the help of the uniform distribution of shear deformation of the adhesive and the redundant constraint of the bolts, transforms the high-amplitude peel stress originally concentrated at the metal-composite interface into low-amplitude shear stress in the bonding surface of the support. This avoids the risk of local stress peaks and interlaminar cracking caused by direct hard contact between the metal angle steel 1 and the inner wall of the blade, achieving safe and fatigue-resistant load transfer of the blade connection accessory 2, while retaining the removability of the bolts for convenient subsequent maintenance or replacement.

[0016] In this embodiment of the application, the blade connection accessory 2 includes at least one of a swing array damper, a counterweight, and a monitoring sensor.

[0017] In this embodiment, the blade connecting accessory 2 is screwed to one side of the metal angle steel 1 by the first bolt 4; after the metal angle steel 1 is bonded to the fiberglass support 3 by the adhesive layer 5, it is then locked by the second bolt 6 to form a hybrid adhesive-screw connection.

[0018] In this embodiment, the fiberglass support 3 is bonded to the inner wall of the blade by hand lay-up, and the two form a flexible transition layer after curing. During the injection process, a positioning sleeve is pre-embedded in the fiberglass support 3. The central cavity of this positioning sleeve serves as the pre-drilled bolt hole position on the fiberglass support 3. The inner diameter of the positioning sleeve is equal to the diameter of the finished bolt hole. The positioning sleeve is integrally cured with the fiber of the fiberglass support 3 during injection. After the fiberglass support 3 is bonded and cured to the inner wall of the blade, only a small amount of resin burrs on the inner wall of the positioning sleeve needs to be removed to form the required bolt hole position, eliminating the need for additional drilling. This avoids secondary drilling of the fiberglass support 3, which could damage the fibers on the fiberglass support 3.

[0019] In this embodiment, a strip-shaped hole is provided on the metal angle steel 1. The length of the hole covers the entire adjustment range required by the blade connection accessory 2. After the installation interface of the blade connection accessory 2 is fitted and inserted into the strip-shaped hole, it can slide freely along the metal angle steel 1 to the theoretical center of gravity position. Then, the first bolt 4 is passed through any point of the strip-shaped hole and pre-tightened to fix the blade connection accessory 2 and the metal angle steel 1 into a whole. The strip-shaped hole provides continuous stepless positioning space for the blade connection accessory 2, eliminating the need for additional adapter plates or shims. The single angle steel simultaneously undertakes the functions of load transfer and position adjustment, and is compatible with different interface forms and center of gravity offsets of the blade connection accessory 2, reducing the number of on-site assembly and disassembly operations, and significantly improving assembly adaptability and construction efficiency.

[0020] In this embodiment, the production and installation process of the blade, metal angle steel 1, blade connecting accessory 2, and fiberglass support 3 is as follows: S1. Based on the preset finite element simulation calculation, determine the installation position of the blade connection accessory 2, and measure the installation position of the fiberglass support 3 on the internal cavity wall of the blade. S2. Fabricate the mold for the fiberglass support 3. Determine the thickness of the fiberglass support 3 based on the load check results. Manually lay up and pour the fiberglass support 3. At the same time, confirm the installation position of the positioning sleeve on the fiberglass support 3 in advance, and mark the center inner cavity of the positioning sleeve (this mark indicates the position of the bolt holes on the fiberglass support 3).

[0021] S3. After the glass fiber support 3 is poured, install the glass fiber support 3 on the pre-measured position on the inner wall of the blade by hand lay-up.

[0022] S4. After the fiberglass support 3 is connected and cured to the inner wall of the blade, holes are drilled directly at the marked positions on the fiberglass support 3. Adhesive 5 is applied between the metal angle steel 1 and the fiberglass support 3 for bonding. Then, the second bolt 6, which passes through the bolt hole on the fiberglass support 3, is used to fix it to the metal angle steel 1.

[0023] S5. The first bolt 4 passes through the strip hole on the metal angle steel 1 and the blade connecting accessory 2 is locked with the nut to realize the installation and fixation between the blade connecting accessory 2 and the metal angle steel 1.

[0024] Because the load-bearing capacity of the hybrid glue-screw connection is greater than that of traditional glued and bolted mechanical connections, it can meet the installation strength requirements of blade connection accessory 2 while maintaining a certain safety margin. At the same time, this hybrid glue-screw connection avoids direct rigid connections on the inner wall of the blade. By adjusting the dimensions of different specifications of metal angle steel 2, bolts, and fiberglass supports 3, the connection requirements of blade connection accessories 2 with various weights and sizes can be flexibly met, making it widely applicable in engineering projects.

[0025] Although embodiments of the present invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A blade connection accessory connection device for a wind turbine generator set, characterized in that, include: Blades, metal angle steel (1), blade attachments (2) and fiberglass support (3); The fiberglass support (3) is bonded to the inner wall of the blade; One side of the metal angle steel (1) is fastened to the fiberglass support (3) by bolts and bonded with structural adhesive; The blade attachment (2) is fastened to the other side of the metal angle steel (1).

2. The blade connection accessory connection device for wind turbine generator sets according to claim 1, characterized in that, The blade attachment (2) includes at least one of a swing array damper, a counterweight, and a monitoring sensor.

3. The blade connection accessory connection device for wind turbine generator sets according to claim 1, characterized in that, The metal angle steel (1) includes a first angle steel plate (11) and a second angle steel plate (12) that are bent and connected. The first angle steel plate (11) is locked to the blade attachment (2) by the first bolt (4); After the second angle steel plate (12) is bonded to the fiberglass support (3) with adhesive (5), it is then locked to the fiberglass support (3) with the second bolt (6), so that the metal angle steel (1) and the fiberglass support (3) form a glue-screw hybrid connection.

4. The blade connection accessory connection device for a wind turbine generator set according to claim 1, characterized in that, The fiberglass support (3) is bonded and fixed to the inner wall of the blade by hand lay-up.

5. The blade connection accessory connection device for a wind turbine generator set according to claim 3, characterized in that, The fiberglass support (3) is pre-installed with a positioning sleeve during injection molding, and the central cavity of the positioning sleeve serves as the bolt hole for the installation of the second bolt (6).

6. The blade connection accessory connection device for a wind turbine generator set according to claim 3, characterized in that, The metal angle steel (1) has a strip-shaped hole, which serves as the bolt hole for the installation of the first bolt (4).

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