Blade root embedded assembly and wind power blade
By designing the blade root embedded part into two parts and adopting mechanical interlocking and slot tenon structure, the stress concentration problem at the blade root of the wind turbine blade is solved, and the load-bearing capacity and connection reliability are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-27
AI Technical Summary
The difference in elastic modulus between the metal bolt sleeve and the composite material layup at the root of the wind turbine blade leads to stress concentration, causing delamination and affecting the load-bearing capacity.
The blade root embedded part is designed as two parts. The blade embedded part and the blade root connector are connected by mechanical interlocking. They are made of the same or similar elastic modulus material to reduce the modulus difference, and the connection strength is enhanced by the slot and tenon structure.
It improves the load-bearing capacity of the wind turbine blade root, reduces the risk of interlayer delamination, and enhances connection reliability and assembly efficiency.
Smart Images
Figure CN121738809A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the technical field of wind turbine equipment, and in particular to a blade root pre-embedded component and a wind turbine blade. Background Technology
[0002] The blade root of the wind turbine blade is assembled and connected to the hub through pre-embedded bolt sleeves. In production, multiple bolt sleeves are usually embedded between the inner and outer composite material layers, and then integrally cured and formed by vacuum injection process.
[0003] However, there is a significant difference in elastic modulus between the metal bolt sleeve and the composite material layup. When the two are only bonded together by adhesive, stress concentration is likely to occur at the interface after being subjected to force, which in turn causes the bolt sleeve and the layup to delaminate, ultimately affecting the load-bearing capacity of the blade root. Summary of the Invention
[0004] The purpose of this disclosure is to provide a blade root pre-embedded component and a wind turbine blade that can reduce interlayer separation and improve the load-bearing capacity of the blade root.
[0005] According to one aspect of this disclosure, a wind turbine blade is provided, the wind turbine blade comprising: a blade root pre-embedded assembly, the blade root pre-embedded assembly including an annular blade root connector and an annular blade pre-embedded component, one end of the blade root connector having a first connecting end, the other end of the blade root connector having a second connecting end, and one end of the blade pre-embedded component having a third connecting end, the first connecting end and the third connecting end being interlocked to restrict the blade pre-embedded component from moving along an axis relative to the blade root connector; a first ply and a second ply, the first ply being laid on the outer peripheral surface of the blade pre-embedded component, and the second ply being laid on the inner peripheral surface of the blade pre-embedded component; wherein, the difference in elastic modulus between the blade pre-embedded component and the first ply is less than the difference in elastic modulus between the blade root connector and the first ply, and / or, the difference in elastic modulus between the blade pre-embedded component and the second ply is less than the difference in elastic modulus between the blade root connector and the second ply.
[0006] The technical solution disclosed herein designs the existing blade root embedded part into two parts. One part is the blade embedded part for pre-embedding inside the blade, and the other part is the blade root connector for connecting to the hub. The blade root connector and the blade embedded part are mechanically interlocked to ensure the connection strength. The blade embedded part can be made of a material with the same or similar elastic modulus as the first ply and / or the second ply, so that the difference in elastic modulus between the blade embedded part and the first ply and / or the second ply is as low as possible. This ensures the reliability of the connection with the hub while solving the problem of stress concentration and delamination caused by the large difference in elastic modulus between the embedded part and the ply after the resin adhesive is subjected to force, thereby improving the load-bearing capacity of the wind turbine blade root.
[0007] Optionally, the blade root connector is made of metal, and the blade pre-embedded component is made of composite material.
[0008] The above solution ensures that the blade root connector itself has sufficient strength and is easy to drill and connect to the hub. At the same time, it solves the problem of stress concentration and delamination caused by the large difference in elastic modulus between the embedded parts and the ply, which leads to stress concentration in the resin adhesive under stress.
[0009] Optionally, the second connection end is provided with a plurality of connection holes.
[0010] The above scheme allows for easy connection of several connecting holes at the second connection end to the moving ring of the pitch bearing via bolts, and the stationary ring of the pitch bearing to the flange on the hub.
[0011] Optionally, the second connection end is configured as a moving ring; the wind turbine blade also includes a stationary ring and rolling elements, the stationary ring, the rolling elements and the moving ring constituting a pitch bearing.
[0012] With the above solution, the blade root connector can be integrated with the pitch bearing and directly connected to the hub via bolts through the holes on the stationary ring. The blade root connector does not need to be connected separately to the pitch bearing, reducing connection steps and improving assembly efficiency.
[0013] Optionally, the first connecting end has a radially extending slot, and the third connecting end partially extends into the slot to interlock the first connecting end and the third connecting end.
[0014] The above scheme can be used to restrict the movement of the third connecting end portion extending into the slot relative to the slot in the circumferential direction, so that the first connecting end and the third connecting end are interlocked in the axial direction.
[0015] Optionally, the first connecting end includes a plurality of first locking blocks, which are spaced apart circumferentially along the blade root connector, and each first locking block has a slot on its inner circumferential surface; the third connecting end includes a plurality of first tenons, which are disposed on the outer circumferential surface of the blade pre-embedded part and spaced apart circumferentially along the blade pre-embedded part; wherein, the circumferential distance between two adjacent first locking blocks along the blade root connector is greater than or equal to the circumferential length of two adjacent first tenons along the blade pre-embedded part, and the first tenons are located in the slots of the first locking blocks.
[0016] The above scheme allows the first tenon to be inserted into the gap between two adjacent first locking blocks, and then rotated circumferentially to insert the first tenon into the slot of the first locking block, thereby restricting the axial movement of the blade pre-embedded part relative to the blade root connector. The structure is simple and easy to implement.
[0017] Optionally, the first connecting end includes a plurality of second locking blocks, which are spaced apart circumferentially along the blade root connector, and each second locking block has a slot on its outer circumferential surface; the third connecting end includes a plurality of second tenons, which are disposed on the inner circumferential surface of the blade pre-embedded part and spaced apart circumferentially along the blade pre-embedded part; wherein the circumferential distance between two adjacent second locking blocks along the blade root connector is greater than or equal to the circumferential length of two adjacent second tenons along the blade pre-embedded part, and the second tenons are located in the slots of the second locking blocks.
[0018] The above scheme allows the second tenon to be inserted into the gap between two adjacent second locking blocks, and then rotated circumferentially to insert the second tenon into the slot of the second locking block, thereby restricting the axial movement of the blade pre-embedded part relative to the blade root connector. The structure is simple and easy to implement.
[0019] Optionally, the first connecting end further includes a plurality of first locking blocks, which are spaced apart circumferentially along the blade root connector, and each first locking block has the slot on its inner circumferential surface; the third connecting end further includes a plurality of first tenons, which are disposed on the outer circumferential surface of the blade pre-embedded part and spaced apart circumferentially along the blade pre-embedded part; wherein, the circumferential distance between two adjacent first locking blocks along the blade root connector is greater than or equal to the circumferential length of two adjacent first tenons along the blade pre-embedded part, and the first tenons are located in the slots of the first locking blocks.
[0020] With the above scheme, the outer circumferential surface of the blade pre-embedded part can be locked together by the first locking block and the first tenon, and the inner circumferential surface of the blade pre-embedded part can be locked together by the second locking block and the second tenon, thereby enabling the blade pre-embedded part and the blade root connector to form a double lock, improving the connection reliability and reducing the possibility of connection separation.
[0021] Optionally, the number of first locking blocks and second locking blocks is the same, and the first locking blocks and second locking blocks are aligned circumferentially along the blade root connector. The aligned first locking blocks and second locking blocks are symmetrically arranged and spaced apart, and the spacing between the first locking blocks and second locking blocks is greater than or equal to the thickness of the blade pre-embedded part. The number of first tenons and second tenons is the same, and the first tenons and second tenons are aligned circumferentially along the blade pre-embedded part. The aligned first tenons and second tenons are symmetrically arranged about the blade pre-embedded part.
[0022] The above solution simplifies the structure, reduces design difficulty, and facilitates production. Furthermore, aligning the first and second locking blocks circumferentially increases the number of first and second locking blocks that can be arranged, thereby improving the connection strength.
[0023] Optionally, the contact surface between the groove of the first locking block and the first tenon is arc-shaped; and / or, the contact surface between the groove of the first locking block and the first tenon is provided with a friction element; and / or, the contact surface between the groove of the second locking block and the second tenon is arc-shaped; and / or, the contact surface between the groove of the second locking block and the second tenon is provided with a friction element.
[0024] With the above solution, the first tenon and / or the second tenon and the corresponding inner wall of the slot can fit together in an arc shape, increasing the stress area, preventing stress concentration, and thus increasing the interface strength of the connection.
[0025] Optionally, filler material may be used to fill the space between two adjacent first locking blocks and / or between two connected second locking blocks.
[0026] The above solution restricts the relative rotation of the first and third connecting ends along the circumference, improving circumferential stability. Simultaneously, the filler can fill the grooves on the wind turbine blade surface, improving aesthetics and facilitating subsequent layering and / or painting operations.
[0027] Optionally, the blade root pre-embedded assembly further includes a clamping block, a first push block, a second push block, and a fastening assembly; the slots of the aligned first locking block and the second locking block are interconnected to form a limiting space, the clamping block is disposed within the limiting space and located between the third connecting end and the blade root connector; the blade root connector is provided with a locking hole, a first oblique hole, and a second oblique hole, the locking hole extending radially along the blade root connector and penetrating the inner and outer circumferential surfaces of the blade root connector, the first oblique hole being inclined and connecting the outer circumferential surface of the blade root connector and the limiting space. The second oblique hole is inclined and connects the inner circumferential surface of the leaf root connector and the limiting space. The first oblique hole and the second oblique hole are connected to the locking hole. The first push block is slidably disposed in the first oblique hole, and the second push block is slidably disposed in the second oblique hole. The fastening component passes through the locking hole, the first push block and the second push block, and the two ends of the fastening component press against one end of the first push block and one end of the second push block respectively, and force the other end of the first push block and the other end of the second push block to push the pressing block against the third connecting end.
[0028] By applying a force to the third connection end by the clamping block in a direction away from the blade root connector, the first tenon and the second tenon can be pressed against the inner wall of the corresponding slot, preventing the first tenon and the second tenon from axially moving in the corresponding slot, thus improving axial stability and thereby improving the load-bearing capacity of the wind turbine blade root.
[0029] According to another aspect of this disclosure, a blade root pre-embedded assembly is also provided, the blade root pre-embedded assembly comprising: an annular blade root connector, one end of the blade root connector having a first connecting end, the other end of the blade root connector having a second connecting end, an annular blade pre-embedded component, one end of the blade pre-embedded component having a third connecting end, the first connecting end and the third connecting end being interlocked to restrict the blade pre-embedded component from moving relative to the blade root connector along an axis; wherein, the blade root connector is made of metal, and the blade pre-embedded component is made of composite material.
[0030] Optionally, the first connecting end has a radially extending slot, and the third connecting end partially extends into the slot to interlock the first connecting end and the third connecting end. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 A perspective view of a leaf root pre-embedded assembly according to an embodiment of the present disclosure is shown; Figure 2 A partial three-dimensional schematic diagram of a leaf root pre-embedded component according to an embodiment of the present disclosure is shown; Figure 3 A perspective view of a blade embedded part according to an embodiment of the present disclosure is shown; Figure 4 A perspective view of a leaf root connector according to an embodiment of the present disclosure is shown; Figure 5 A perspective view of the first step of interlocking the first connection end and the third connection end according to an embodiment of the present disclosure is shown. Figure 6 A half-sectional schematic diagram of the first step of interlocking the first connection end and the third connection end according to an embodiment of the present disclosure is shown. Figure 7 A perspective view of the second step of interlocking the first connection end and the third connection end according to an embodiment of the present disclosure is shown. Figure 8 A half-sectional schematic diagram of the second step of interlocking the first connection end and the third connection end according to an embodiment of the present disclosure is shown.
[0033] Explanation of reference numerals in the attached figures: 1000. Leaf root pre-embedded components; 100. Leaf root connector; 101. Locking hole; 102. First oblique hole; 103. Second oblique hole; 110. First connecting end; 111. Slot; 112. First locking block; 113. Second locking block; 120. Second connecting end; 121. Connecting hole; 200. Blade embedded part; 210. Third connecting end; 211. First tenon; 212. Second tenon; 300. Filler parts; 410. Clamping block; 420. First push block; 430. Second push block; 440. Fastening assembly. Detailed Implementation
[0034] Wind turbine blades typically have bolt sleeves pre-embedded at their root for connection to the hub during assembly. During blade manufacturing, multiple bolt sleeves are usually embedded between the inner and outer plies, then integrally molded using vacuum infusion curing. However, because the bolt sleeves are metal and the upper and lower plies are composite materials, the significant difference in elastic modulus between the metal and composite materials means that direct adhesive bonding can lead to stress concentration under load. This can cause delamination between the bolt sleeves and the plies, affecting the load-bearing capacity at the blade root.
[0035] To address this, the present disclosure designs the existing blade root embedded part into two parts. One part is a blade embedded part for pre-embedding in the blade, and the other part is a blade root connector for connecting to the hub. The blade root connector and the blade embedded part are mechanically interlocked to ensure the connection strength. The blade embedded part can be made of a material with the same or similar elastic modulus as the first ply and / or the second ply, so that the difference in elastic modulus between the blade embedded part and the first ply and / or the second ply is as low as possible. This ensures the reliability of the connection with the hub while solving the problem of stress concentration and delamination caused by the large difference in elastic modulus between the embedded part and the ply after adhesive bonding, thereby improving the load-bearing capacity of the wind turbine blade root.
[0036] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.
[0037] This disclosure provides a wind turbine blade, which is a core aerodynamic component of a wind turbine generator set. Its core function is to capture wind energy and convert it into mechanical energy, driving the hub and rotating the generator to generate electricity. Its design and performance directly determine the generator set's power generation efficiency and operational stability. The root of the wind turbine blade is locked and fixed to a flange on the hub to achieve the connection between the wind turbine blade and the hub.
[0038] Specifically, regarding the specific structure of wind turbine blades, such as Figures 1 to 4 As shown, a wind turbine blade may include a root pre-embedded assembly 1000, a first ply, and a second ply. The root pre-embedded assembly 1000 may include a root connector 100 and a blade pre-embedded component 200. Both the root connector 100 and the blade pre-embedded component 200 are constructed in a ring shape. The root connector 100 has a first connecting end 110 at one end along its axial direction and a second connecting end 120 at the other end along its axial direction, located between the first connecting end 110 and the second connecting end 120. The blade pre-embedded component 200 has a third connecting end 210 at one end, which is used to connect to a hub. The first connecting end 110 and the third connecting end 210 are interlocked to restrict the blade pre-embedded component 200 from moving relative to the root connector 100 along its axial direction. The first ply is laid on the outer circumferential surface of the blade pre-embedded component 200, and the second ply is laid on the inner circumferential surface of the blade pre-embedded component 200. Wherein, the difference in elastic modulus between the blade embedded part 200 and the first ply is less than the difference in elastic modulus between the blade root connector 100 and the first ply, and / or, the difference in elastic modulus between the blade embedded part 200 and the second ply is less than the difference in elastic modulus between the blade root connector 100 and the second ply.
[0039] In this way, the present disclosure is equivalent to designing the existing blade root embedded part into two parts. One part is the blade embedded part 200 for pre-embedding in the blade, and the other part is the blade root connector 100 for connecting with the hub. The blade root connector 100 and the blade embedded part 200 are connected by mechanical interlocking to ensure the connection strength. The blade embedded part 200 can be made of the same or similar elastic modulus material as the first ply and / or the second ply, so that the difference in elastic modulus between the blade embedded part 200 and the first ply and / or the second ply is as small as possible. This ensures the reliability of the connection with the hub, solves the problem that the large difference in elastic modulus between the embedded part and the ply makes the resin adhesive prone to stress concentration and delamination after being subjected to force, and improves the load-bearing capacity of the wind turbine blade root.
[0040] For example, the blade root connector 100, the first connecting end 110, and the second connecting end 120 can be integrally designed to ensure the connection strength between the blade root connector 100, the first connecting end 110, and the second connecting end 120. The blade pre-embedded part 200 and the third connecting end 210 can also be integrally designed to ensure the connection strength between the blade pre-embedded part 200 and the third connecting end 210. The blade root connector 100 can be integrally designed in a ring shape, or it can be a split design, for example, the blade root connector 100 can be divided into two circumferentially segments and then spliced together to facilitate processing. The blade pre-embedded part 200 can be integrally designed in a ring shape, or the blade root connector 100 can be a split design, for example, the blade root connector 100 can be divided into two circumferentially segments and then spliced together to facilitate processing.
[0041] In practical applications, the first and second plies can cover the inner and outer circumferential surfaces of the blade pre-embedded part 200, and then be bonded together as a whole by resin injection and curing. The first and second plies can also extend to the interlocking portion of the blade pre-embedded part 200 and the blade root connector 100, so that at the resin injection and curing joint, the interlocking portion of the blade pre-embedded part 200 and the blade root connector 100 are glued together, restricting circumferential movement.
[0042] In some embodiments, the blade root connector 100 can be made of metal or a similar material to ensure sufficient strength and facilitate drilling for connection with the hub. The blade embedded part 200 is a composite material, for example, it can be made of fiberglass cloth laid and cured by resin injection. Correspondingly, the first and second layups are also made of fiberglass cloth to ensure that their elastic moduli are nearly identical, further solving the problem of stress concentration and delamination between the embedded part and the layup caused by the large difference in elastic modulus between them.
[0043] In some embodiments, the second connecting end 120 may be provided with a plurality of connecting holes 121, which are arranged in a circumferential array along the second connecting end 120 to facilitate the connection of the plurality of connecting holes 121 of the second connecting end 120 to the moving ring of the pitch bearing by bolts, and the stationary ring of the pitch bearing to be connected to the flange on the hub.
[0044] In some other embodiments, the second connection end 120 is configured as a moving ring, and the wind turbine blade also includes a stationary ring and rolling elements. The stationary ring, rolling elements and moving ring constitute a pitch bearing, so that the blade root connector 100 can be integrated with part of the pitch bearing and directly connected to the hub through bolts via holes on the stationary ring. The blade root connector 100 does not need to be connected separately to the pitch bearing, reducing connection steps and improving assembly efficiency.
[0045] In practical applications, the stationary ring and rolling elements can be assembled with the second connecting end 120 first, and then the blade root connector 100 with the stationary ring and rolling elements can be connected with the blade embedded part 200.
[0046] In some embodiments, the first connecting end 110 has a radially extending slot 111, and the third connecting end 210 partially extends into the slot 111, thereby using the slot 111 to restrict the circumferential movement of the third connecting end 210 portion extending into the slot 111 relative to the slot 111, so that the first connecting end 110 and the third connecting end 210 are axially interlocked, which is simple in structure and easy to manufacture.
[0047] Regarding the specific structure of the first connecting end 110 having a radially extending slot 111 and the third connecting end 210 partially extending into the slot 111, this disclosure provides three feasible embodiments for reference.
[0048] In Embodiment 1, the first connecting end 110 includes a plurality of first locking blocks 112, which are spaced apart circumferentially along the blade root connector 100. Each first locking block 112 has a groove 111 on its inner circumferential surface. The third connecting end 210 includes a plurality of first tenons 211, which are disposed on the outer circumferential surface of the blade pre-embedded part 200 and spaced apart circumferentially along the blade pre-embedded part 200. The circumferential distance between two adjacent first locking blocks 112 along the blade root connector 100 is greater than or equal to the circumferential length of two adjacent first tenons 211 along the blade pre-embedded part 200. The first tenons 211 are located within the grooves 111 of the first locking blocks 112. In this way, the first tenon 211 can be inserted into the gap between two adjacent first locking blocks 112, and then rotated circumferentially so that the first tenon 211 is inserted into the slot 111 of the first locking block 112, thereby restricting the axial movement of the blade embedded part 200 relative to the blade root connector 100.
[0049] In practical applications, the outer peripheral surface of the first locking block 112 is inclined toward the blade pre-embedded part 200 at the end away from the blade root connector 100 so that the first locking block 112 and the blade pre-embedded part 200 can be smoothly transitioned, which facilitates the laying of the first layup.
[0050] In embodiment 2, the first connecting end 110 includes a plurality of second locking blocks 113, which are spaced apart circumferentially along the blade root connector 100. Each second locking block 113 has a slot 111 on its outer peripheral surface. The third connecting end 210 includes a plurality of second tenons 212, which are disposed on the inner peripheral surface of the blade pre-embedded part 200 and spaced apart circumferentially along the blade pre-embedded part 200. The circumferential spacing between two adjacent second locking blocks 113 along the blade root connector 100 is greater than or equal to the circumferential length of two adjacent second tenons 212 along the blade pre-embedded part 200. The second tenons 212 are located in the slots 111 of the second locking blocks 113. In this way, the second tenon 212 can be inserted into the gap between two adjacent second locking blocks 113 first, and then rotated circumferentially so that the second tenon 212 is inserted into the slot 111 of the second locking block 113, thereby restricting the axial movement of the blade embedded part 200 relative to the blade root connector 100.
[0051] In practical applications, the inner circumferential surface of the second locking block 113 is inclined toward the blade pre-embedded part 200 at the end away from the blade root connector 100, so that the second locking block 113 and the blade pre-embedded part 200 can be smoothly transitioned, which facilitates the laying of the second layup.
[0052] In Embodiment 3, based on Embodiment 2, the first connecting end 110 further includes a plurality of first locking blocks 112, which are spaced apart circumferentially along the blade root connector 100. Each first locking block 112 has a groove 111 on its inner circumferential surface. The third connecting end 210 further includes a plurality of first tenons 211, which are disposed on the outer circumferential surface of the blade pre-embedded part 200 and spaced apart circumferentially along the blade pre-embedded part 200. The circumferential spacing between two adjacent first locking blocks 112 along the blade root connector 100 is greater than or equal to the circumferential length of two adjacent first tenons 211 along the blade pre-embedded part 200, and the first tenons 211 are located within the grooves 111 of the first locking blocks 112. In this way, the outer peripheral surface of the blade pre-embedded part 200 can be locked together by the first locking block 112 and the first tenon 211, and the inner peripheral surface of the blade pre-embedded part 200 can be locked together by the second locking block 113 and the second tenon 212, thereby enabling the blade pre-embedded part 200 and the blade root connector 100 to form a double lock, improving the connection reliability and reducing the possibility of connection separation.
[0053] In practical applications, the third connecting end 210 and the blade embedded part 200 can be integrally formed by laying glass fiber cloth and then curing it with resin, and then cutting it to form the third connecting end 210. Specifically, during the laying of the glass limiting cloth, Teflon can be laid on the area to be cut, and then during the cutting process, the Teflon can be cut from the outer peripheral surface to the area where the Teflon is located, and the part on the Teflon can be removed to form a groove structure. The first tenon 211 is formed between two adjacent groove structures, which facilitates production operations.
[0054] For example, the number of the first locking blocks 112 and the number of the second locking blocks 113 may be the same or different, and the first locking blocks 112 and the second locking blocks 113 may be misaligned or aligned along the circumferential direction of the leaf root connector 100.
[0055] Preferred, such as Figures 3 to 8 As shown, the number of first locking blocks 112 and second locking blocks 113 is the same. These first locking blocks 112 and second locking blocks 113 are aligned circumferentially along the blade root connector 100, thus simplifying the structure, reducing design difficulty, and facilitating production. Furthermore, the circumferential alignment of the first locking blocks 112 and second locking blocks 113 increases the number of arrangable first locking blocks 112 and second locking blocks 113, thereby improving connection strength. Specifically, the aligned first locking blocks 112 and second locking blocks 113 are symmetrically arranged and spaced apart. The distance between the first locking blocks 112 and second locking blocks 113 is greater than or equal to the thickness of the blade embedded part 200. In other words, the radial distance between the first locking blocks 112 and second locking blocks 113 is greater than or equal to the thickness of the blade embedded part 200, making room for the blade embedded part 200 so that it can be inserted between the first locking blocks 112 and second locking blocks 113. The number of first tenons 211 and second tenons 212 is the same, and the first tenons 211 and second tenons 212 are aligned along the circumference of the blade pre-embedded part 200. The relatively aligned first tenons 211 and second tenons 212 are symmetrically arranged about the blade pre-embedded part 200.
[0056] To facilitate understanding of the interlocking process between the first connection terminal 110 and the third connection terminal 210, this disclosure describes the interlocking process between the first connection terminal 110 and the third connection terminal 210 in two steps.
[0057] The first step of interlocking the first connecting end 110 and the third connecting end 210 involves aligning the first tenon 211 with the space between two adjacent first locking blocks 112, aligning the second tenon 212 with the space between two adjacent second locking blocks 113, aligning the blade pre-embedded part 200 with the space between the first locking blocks 112 and the second locking blocks 113, and then moving them axially to interlock them to form a... Figure 5 and Figure 6 The state shown.
[0058] Next, in the second step of interlocking the first connecting end 110 and the third connecting end 210, the blade pre-embedded part 200 and its first tenon 211 and second tenon 212 are rotated axially as a whole, so that the first tenon 211 is inserted into the slot 111 of the first locking block 112 and the second tenon 212 is inserted into the slot 111 of the second locking block 113, thereby completing the interlocking.
[0059] Furthermore, the contact surface between the groove 111 of the first locking block 112 and the first tenon 211 is arc-shaped; and / or, the contact surface between the groove 111 of the second locking block 113 and the second tenon 212 is arc-shaped. In this way, the first tenon 211 and / or the second tenon 212 and the corresponding inner wall surface of the groove 111 can fit together in an arc shape, increasing the stress-bearing area, preventing stress concentration, and thus increasing the interface strength of the connection.
[0060] Furthermore, the contact surface between the groove 111 of the first locking block 112 and the first tenon 211 is provided with a friction element; and / or, the contact surface between the groove 111 of the second locking block 113 and the second tenon 212 is provided with a friction element. The friction element is typically made of a material with a rough surface or a high coefficient of friction, and its rough surface forms a microscopic meshing structure with the contact surface. Under external force, this meshing structure can counteract the relative sliding tendency between the components through friction, which is equivalent to indirectly improving the interface's resistance to separation or slippage, i.e., increasing the connection strength between the first tenon 211 and / or the second tenon 212 and the inner wall surface of the corresponding groove 111.
[0061] In practical applications, the friction component can be made of chopped strand mat. Chopped strand mat can be attached to at least one of the surfaces where the first tenon 211 and the corresponding slot 111 come into contact before interlocking the first tenon 211 with the corresponding slot 111.
[0062] Of course, glue or resin can also be filled on the contact surfaces of the first tenon 211 and / or the second tenon 212 and the corresponding slot 111 to transform the frictional contact into a fixed contact and improve the connection strength.
[0063] In some embodiments, such as Figure 1 As shown, after the first connecting end 110 and the third connecting end 210 are interlocked, a filler 300 is filled between two adjacent first locking blocks 112 and / or between two connected second locking blocks 113. This filler 300 restricts the relative rotation of the first connecting end 110 and the third connecting end 210 in the circumferential direction, improving circumferential stability. Simultaneously, the filler 300 can fill the grooves on the surface of the wind turbine blade, improving aesthetics and facilitating subsequent layering and / or painting operations.
[0064] In practical applications, the filler 300 may include foam blocks and lay-up layers. First, foam blocks are filled between two adjacent first locking blocks 112 and between two connected second locking blocks 113 to make the empty parts relatively flat. Then, lay-up layers are laid and resin is injected and cured.
[0065] Furthermore, such as Figure 6 and Figure 8 As shown, the blade root pre-embedded assembly 1000 also includes a clamping block 410, a first push block 420, a second push block 430, and a fastening assembly 440. The slots 111 of the aligned first locking block 112 and second locking block 113 are interconnected to form a limiting space. The clamping block 410 is disposed within the limiting space and located between the third connecting end 210 and the blade root connector 100. The blade root connector 100 is provided with a locking hole 101, a first oblique hole 102, and a second oblique hole 103. The locking hole 101 extends radially along the blade root connector 100 and penetrates the inner and outer circumferential surfaces of the blade root connector 100. The first oblique hole 102 is inclined and connects the outer circumferential surface of the blade root connector 100 and the limiting space. The second oblique hole 103 is inclined and connects the inner circumferential surface of the blade root connector 100 and the limiting space. The first oblique hole 102 and the second oblique hole 103 are connected to the locking hole 101. The first push block 420 is slidably disposed in the first inclined hole 102, and the second push block 430 is slidably disposed in the second inclined hole 103. The fastening component 440 passes through the locking hole 101, the first push block 420 and the second push block 430, and the two ends of the fastening component 440 respectively press against one end of the first push block 420 and one end of the second push block 430, forcing the first push block 420 and the second push block 430 to slide into the limiting space, so that the other end of the first push block 420 and the other end of the second push block 430 push the pressing block 410 to press against the third connecting end 210, thereby applying a force to the third connecting end 210 in a direction away from the blade root connector 100 through the pressing block 410, so that the first tenon 211 and the second tenon 212 can be pressed against the inner wall surface of the corresponding slot 111, preventing the first tenon 211 and the second tenon 212 from axially moving in the corresponding slot 111, improving axial stability, and thus improving the load-bearing capacity of the wind turbine blade root.
[0066] In practical applications, the fastening assembly 440 may include a bolt and a nut. The small end of the bolt may pass through the locking hole 101, the first push block 420 and the second push block 430 and connect to the nut. As the nut is tightened, there is a relative force between the nut and the large end of the bolt. This force is applied to the first push block 420 and the second push block 430, which can cause the first push block 420 and the second push block 430 to slide along their respective inclined holes toward the limiting space, thereby pushing the clamping block 410 toward the third connecting end 210 to press against it.
[0067] According to another aspect of this disclosure, a blade root pre-embedded assembly 1000 is also provided, which can be integrally disposed in a wind turbine blade. The blade root pre-embedded assembly 1000 includes: an annular blade root connector 100, one end of which is provided with a first connecting end 110 and the other end of which is provided with a second connecting end 120; an annular blade pre-embedded component 200, one end of which is provided with a third connecting end 210; the first connecting end 110 and the third connecting end 210 are interlocked to restrict the blade pre-embedded component 200 from moving relative to the blade root connector 100 along the axis; wherein, the blade root connector 100 is made of metal and the blade pre-embedded component 200 is made of composite material.
[0068] Furthermore, the first connecting end 110 has a radially extending slot 111, and the third connecting end 210 partially extends into the slot 111 so that the first connecting end 110 and the third connecting end 210 interlock.
[0069] It should be noted that the specific structures of the blade root connector 100, the first connecting end 110, the second connecting end 120, the blade pre-embedded part 200, and the third connecting end 210 can be found in the detailed descriptions in the above embodiments, and will not be repeated here.
[0070] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.
[0071] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0072] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.
Claims
1. A wind turbine blade, characterized in that, The wind turbine blades include: A blade root pre-embedded assembly (1000) includes an annular blade root connector (100) and an annular blade pre-embedded component (200). One end of the blade root connector (100) is provided with a first connecting end (110), and the other end of the blade root connector (100) is provided with a second connecting end (120). One end of the blade pre-embedded component (200) is provided with a third connecting end (210). The first connecting end (110) and the third connecting end (210) are interlocked to restrict the blade pre-embedded component (200) from moving relative to the blade root connector (100) along the axis. A first ply and a second ply, wherein the first ply is laid on the outer circumferential surface of the blade pre-embedded part (200) and the second ply is laid on the inner circumferential surface of the blade pre-embedded part (200); Wherein, the difference in elastic modulus between the blade embedded part (200) and the first ply is less than the difference in elastic modulus between the blade root connector (100) and the first ply, and / or, the difference in elastic modulus between the blade embedded part (200) and the second ply is less than the difference in elastic modulus between the blade root connector (100) and the second ply.
2. The wind turbine blade according to claim 1, characterized in that, The blade root connector (100) is made of metal, and the blade pre-embedded part (200) is made of composite material.
3. The wind turbine blade according to claim 1, characterized in that, The second connecting end (120) is provided with a plurality of connecting holes (121).
4. The wind turbine blade according to claim 1, characterized in that, The second connection end (120) is configured as a moving coil; The wind turbine blade also includes a stationary ring and rolling elements, and the stationary ring, the rolling elements and the moving ring constitute a pitch bearing.
5. The wind turbine blade according to any one of claims 1 to 4, characterized in that, The first connecting end (110) has a radially extending slot (111), and the third connecting end (210) partially extends into the slot (111) so that the first connecting end (110) and the third connecting end (210) interlock.
6. The wind turbine blade according to claim 5, characterized in that, The first connecting end (110) includes a plurality of first locking blocks (112), which are spaced apart circumferentially along the leaf root connector (100), and each first locking block (112) has the slot (111) on its inner circumferential surface. The third connecting end (210) includes a plurality of first tenons (211), which are disposed on the outer peripheral surface of the blade pre-embedded part (200) and spaced apart along the circumferential direction of the blade pre-embedded part (200). Wherein, the circumferential spacing between two adjacent first locking blocks (112) along the blade root connector (100) is greater than or equal to the circumferential length of two adjacent first tenons (211) along the blade embedded part (200), and the first tenon (211) is located in the slot (111) of the first locking block (112).
7. The wind turbine blade according to claim 5, characterized in that, The first connecting end (110) includes a plurality of second locking blocks (113), which are spaced apart along the circumferential direction of the leaf root connector (100), and each second locking block (113) has the slot (111) on its outer peripheral surface. The third connecting end (210) includes a plurality of second tenons (212), which are disposed on the inner circumferential surface of the blade pre-embedded part (200) and are spaced apart along the circumferential direction of the blade pre-embedded part (200). Wherein, the circumferential spacing between two adjacent second locking blocks (113) along the blade root connector (100) is greater than or equal to the circumferential length of two adjacent second tenons (212) along the blade embedded part (200), and the second tenon (212) is located in the slot (111) of the second locking block (113).
8. The wind turbine blade according to claim 7, characterized in that, The first connecting end (110) further includes a plurality of first locking blocks (112), the plurality of first locking blocks (112) are arranged at intervals along the circumference of the leaf root connector (100), and each first locking block (112) has the slot (111) on its inner circumferential surface. The third connecting end (210) further includes a plurality of first tenons (211), which are disposed on the outer peripheral surface of the blade pre-embedded part (200) and are spaced apart along the circumferential direction of the blade pre-embedded part (200). Wherein, the circumferential spacing between two adjacent first locking blocks (112) along the blade root connector (100) is greater than or equal to the circumferential length of two adjacent first tenons (211) along the blade embedded part (200), and the first tenon (211) is located in the slot (111) of the first locking block (112).
9. The wind turbine blade according to claim 8, characterized in that, The number of first locking blocks (112) and second locking blocks (113) is the same. The first locking blocks (112) and second locking blocks (113) are aligned along the circumference of the blade root connector (100). The aligned first locking blocks (112) and second locking blocks (113) are symmetrically arranged and spaced apart. The spacing between the first locking blocks (112) and second locking blocks (113) is greater than or equal to the thickness of the blade embedded part (200). The number of first tenons (211) and second tenons (212) is the same, and the first tenons (211) and second tenons (212) are aligned along the circumference of the blade pre-embedded part (200). The aligned first tenons (211) and second tenons (212) are symmetrically arranged with respect to the blade pre-embedded part (200).
10. The wind turbine blade according to claim 9, characterized in that, The contact surface between the slot (111) of the first locking block (112) and the first tenon (211) is arc-shaped; and / or, The contact surface between the slot (111) of the first locking block (112) and the first tenon (211) is provided with a friction element; and / or, The contact surface between the slot (111) of the second locking block (113) and the second tenon (212) is arc-shaped; and / or, The contact surface between the slot (111) of the second locking block (113) and the second tenon (212) is provided with a friction element.
11. The wind turbine blade according to claim 9, characterized in that, A filler (300) is provided between two adjacent first locking blocks (112) and / or between two connected second locking blocks (113).
12. The wind turbine blade according to claim 9, characterized in that, The leaf root pre-embedded component (1000) also includes a clamping block (410), a first push block (420), a second push block (430), and a fastening component (440). The slots (111) of the first locking block (112) and the second locking block (113) that are aligned with each other are connected to form a limiting space. The pressing block (410) is located in the limiting space and between the third connecting end (210) and the leaf root connector (100). The leaf root connector (100) is provided with a locking hole (101), a first oblique hole (102) and a second oblique hole (103). The locking hole (101) extends radially along the leaf root connector (100) and penetrates the inner and outer peripheral surfaces of the leaf root connector (100). The first oblique hole (102) is inclined and connects the outer peripheral surface of the leaf root connector (100) and the limiting space. The second oblique hole (103) is inclined and connects the inner peripheral surface of the leaf root connector (100) and the limiting space. The first oblique hole (102) and the second oblique hole (103) are connected to the locking hole (101). The first push block (420) is slidably disposed in the first inclined hole (102), the second push block (430) is slidably disposed in the second inclined hole (103), the fastening component (440) passes through the locking hole (101), the first push block (420) and the second push block (430), and the two ends of the fastening component (440) press against one end of the first push block (420) and one end of the second push block (430) respectively, and force the other end of the first push block (420) and the other end of the second push block (430) to push the pressing block (410) against the third connecting end (210).
13. A leaf root pre-embedded component, characterized in that, The leaf root pre-embedded component (1000) includes: A ring-shaped leaf root connector (100) is provided at one end of a first connecting end (110) and at the other end of a second connecting end (120). A ring-shaped blade pre-embedded part (200) is provided at one end of the blade pre-embedded part (200) with a third connecting end (210). The first connecting end (110) and the third connecting end (210) are interlocked to restrict the blade pre-embedded part (200) from moving along the axis relative to the blade root connector (100). The blade root connector (100) is made of metal, and the blade pre-embedded part (200) is made of composite material.
14. The leaf root pre-embedded component according to claim 13, characterized in that, The first connecting end (110) has a radially extending slot (111), and the third connecting end (210) partially extends into the slot (111) so that the first connecting end (110) and the third connecting end (210) interlock.