Segmented blade of wind driven generator and wind driven generator

Abstract

The invention discloses a segmented blade of a wind driven generator and the wind driven generator, the segmented blade of the wind driven generator comprises a first blade section and a second blade section which are connected through a connecting structure, the connecting structure comprises a first embedded part, a second embedded part, a tensioning part and a wedge block, and the first embedded part is arranged in the connecting end of the first blade section; the second embedded part comprises an embedded section and a box body which are connected, and the embedded section is arranged in the connecting end of the second blade section; the box body extends out of the connecting end of the second blade section, and a containing cavity is formed in the box body; the wedge-shaped block is detachably arranged in the accommodating cavity, and the wedge-shaped block is provided with a first inclined surface which abuts against the pressure-bearing end; when the wedge-shaped block is arranged in the containing cavity, the first inclined face abuts against the pressure bearing end, and the first inclined face exerts pre-tightening force in the direction away from the first embedded part on the pressure bearing end. According to the technical scheme, it can be ensured that the connecting structure can still maintain extremely high connecting rigidity and fastening performance for a long time in the complex load environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generators, in particular to a segmented blade of a wind power generator and a wind power generator. BACKGROUND

[0002] The blade of a wind power generator is a core component for capturing wind energy and converting energy. With the development of wind power equipment towards high power, the length of the blade continues to increase, and the difficulty and cost of integrated production, transportation and installation increase significantly. The segmented blade solves the production and transportation bottleneck of the super-long blade by splitting the blade into multiple blade segments and assembling them on site, which becomes an important technical direction for large-scale wind power blades.

[0003] In the prior art, the blade segments are usually connected directly by bolts or inserted. The bolt connection is prone to looseness under long-term vibration load, resulting in a decrease in pre-tightening force. The insertion method has stress concentration and fretting wear problems. Both of them will cause a decrease in the connection tightness between the blade segments, making it difficult to maintain stable connection strength for a long time, and there is a safety hazard. SUMMARY

[0004] The purpose of the present application is to provide a segmented blade of a wind power generator and a wind power generator, which can ensure that the connection structure can still maintain high connection stiffness and tightness for a long time under complex load environment.

[0005] In a first aspect, the present application provides a segmented blade of a wind power generator, comprising a first blade segment and a second blade segment connected by a connection structure, wherein the connection structure comprises: a first embedded part arranged in a connection end of the first blade segment; a second embedded part comprising a connected embedded segment and a box body, the embedded segment being arranged in a connection end of the second blade segment; the box body extending out of the connection end of the second blade segment, the box body being provided with a receiving cavity, and a through hole being formed in the box body and communicating with the receiving cavity, the through hole being arranged opposite to the first embedded part; a tensioning member having oppositely arranged pressure receiving end and butt joint end, the pressure receiving end being detachably arranged in the receiving cavity, and the butt joint end being adapted to pass through the through hole and detachably connect with the first embedded part; a wedge-shaped block being detachably arranged in the receiving cavity, the wedge-shaped block having a first inclined surface abutting against the pressure receiving end; When the wedge-shaped block is arranged in the receiving cavity, the first inclined surface abuts against the pressure receiving end, and the first inclined surface applies a pre-tightening force to the pressure receiving end in a direction away from the first embedded part.

[0006] Beneficial effects: When the segmented blades of the wind turbine are connected by the connecting structure, first, the first embedded part is installed in the connecting end of the first blade segment, and the embedded segment of the second embedded part is installed in the connecting end of the second blade segment, and the box body of the second embedded part is extended out of the connecting end of the second blade segment, and the first embedded part and the second embedded part are ensured to correspond. Then, the pressure end of the tensioning piece is installed in the accommodating cavity of the box body, and the abutting end of the tensioning piece is extended out of the through hole and connected with the first embedded part, so that the preliminary abutment of the first blade segment and the second blade segment is completed. Then, the wedge-shaped block is installed in the accommodating cavity of the box body. During the process of installing the wedge-shaped block in the accommodating cavity, the wedge-shaped block is displaced downward relative to the box body, and the downward displacement is converted into a horizontal thrust on the pressure end of the tensioning piece through the first inclined surface, so that the tensioning piece is stretched in the axial direction, thereby generating a pre-tightening force between the first blade segment and the second blade segment.

[0007] By continuously applying the pre-tightening force on the pressure end of the tensioning piece away from the first embedded part through the first inclined surface, a continuous, stable and large pre-tightening force is generated between the blade segment connection interfaces, forming a stable mechanical self-locking effect, which ensures that the connecting structure can still maintain high connection stiffness and fastening in a complex load environment for a long time. The problem of pre-tightening force relaxation caused by vibration in traditional bolt connection is avoided, and the stress concentration and fretting wear defects of the plug-in mode are overcome, which can maintain the connection strength between the blade segments for a long time and significantly reduce the safety hidden danger.

[0008] In addition, the first inclined surface of the wedge-shaped block forms a surface contact with the pressure end of the tensioning piece, which can uniformly transmit the pre-tightening force to the connection part and reduce local stress concentration. At the same time, the first embedded part and the second embedded part are directly connected by the tensioning piece to form a rigid force chain, which improves the load transmission efficiency between the blade segments and meets the working condition requirements of the wind turbine under long-term alternating wind load.

[0009] In addition, during on-site installation, high-strength connection can be completed by only inserting and installing the wedge-shaped block in the tensioning piece. This process does not require large or special tensioning equipment (such as a hydraulic stretcher), and the operation is simple and fast, which reduces the labor, difficulty and cost of on-site installation, and also provides great convenience for subsequent maintenance, disassembly and replacement.

[0010] In an optional embodiment, the inclination angle of the first inclined surface is θ, and 5°≤θ≤12°.

[0011] Beneficial effects: When 5°≤θ≤12°, the first inclined surface can provide sufficient transverse pre-tightening force, form a stable mechanical self-locking effect, and ensure that the connecting structure 1000 can still maintain high connection stiffness and fastening in a complex load environment for a long time.

[0012] In an alternative embodiment, a plurality of connecting holes are formed on the wedge-shaped block, the axial direction of the connecting holes is arranged at an angle with the axial direction of the tensioning member, and a mounting hole corresponding to the connecting hole is arranged in the box body; The wedge-shaped block is connected with the corresponding mounting hole through the connecting member passing through the connecting hole.

[0013] Beneficial effect: the axial direction of the connecting hole is arranged at an angle with the axial direction of the tensioning member, when the connecting member is tightened, additional compression force in the inclined direction is generated on the wedge-shaped block, so that the wedge-shaped block moves downward, and in the process of moving downward of the wedge-shaped block, the wedge-shaped block applies pre-tightening force to the pressure-bearing end through the first inclined surface, so as to ensure long-term stability of the pre-tightening force of the first inclined surface to the tensioning member.

[0014] In an alternative embodiment, the connecting structure further comprises a first sliding block, the first sliding block is movably arranged in the accommodating cavity, and the first sliding block is clamped between the pressure-bearing end and the wedge-shaped block, one side of the first sliding block towards the wedge-shaped block is provided with a first matching surface, and the first matching surface is in contact with the first inclined surface.

[0015] Beneficial effect: the first matching surface of the first sliding block is completely in contact with the first inclined surface of the wedge-shaped block, the pushing force generated by the downward displacement of the wedge-shaped block can be uniformly transmitted to the first sliding block through complete surface contact, and further transmitted to the pressure-bearing end of the tensioning member. Compared with the direct contact between the wedge-shaped block and the pressure-bearing end, local stress concentration can be avoided, the stable transmission of the pre-tightening force along the axial direction of the tensioning member is ensured, and the load carrying capacity of the connecting structure is further improved.

[0016] In an alternative embodiment, the wedge-shaped block is further provided with a second inclined surface, and the second inclined surface is arranged opposite to the first inclined surface; The connecting structure further comprises a second sliding block, the second sliding block is movably arranged in the accommodating cavity, and the second sliding block is clamped between the inner wall of the box body and the wedge-shaped block, one side of the second sliding block towards the wedge-shaped block is provided with a second matching surface, and the second matching surface is in contact with the second inclined surface.

[0017] Beneficial effect: when the wedge-shaped block moves downward, the first inclined surface applies pushing force to the pressure-bearing end of the tensioning member through the first sliding block, and at the same time, the second inclined surface transmits reaction force to the inner wall of the box body through the second sliding block. The bidirectional force transmission can balance the lateral eccentric load received by the wedge-shaped block, prevent the wedge-shaped block from tilting or jamming in the accommodating cavity, ensure the stable movement of the wedge-shaped block in the preset direction, and guarantee the linearity and accuracy of the pre-tightening force transmission.

[0018] In an alternative embodiment, the box body is further provided with a mounting groove on the side wall of the through hole, one end of the mounting groove being in communication with the through hole and the other end extending to the opening of the accommodating cavity, the mounting groove being used for guiding and accommodating the installation of the tensioning member into the accommodating cavity.

[0019] Beneficial effects: One end of the mounting groove is in communication with the through hole, and the other end extends to the opening of the accommodating cavity. During assembly, the tensioning member can be quickly installed without precise alignment with the through hole. The tensioning member only needs to be slid into the opening along the mounting groove, and can be naturally guided to the position of the through hole and then passed out, thereby improving the installation efficiency.

[0020] In an alternative embodiment, the first embedded member is provided with a threaded hole in the axial direction thereof, and the abutting end of the tensioning member is provided with an external thread, the external thread being matched with the internal thread of the threaded hole.

[0021] Beneficial effects: The rigid connection is formed by the spiral engagement of the external thread of the abutting end and the internal thread of the threaded hole, which can provide sufficient axial tensile strength and circumferential torsional capacity, and can stably withstand the tensile and torsional forces caused by alternating wind load and centrifugal force during the operation of the blade, thereby avoiding the loosening of the connection part. At the same time, the contact surface of the threaded engagement is large, which can disperse the local load and reduce the damage of the components caused by excessive stress at a single point, thereby adapting to the harsh working conditions of the long-term outdoor operation of the wind turbine.

[0022] In an alternative embodiment, the embedded section is provided with a weight-reducing hole in the axial direction thereof.

[0023] Beneficial effects: By providing the weight-reducing hole on the embedded section, the weight-reducing hole can directly reduce the material usage of the embedded section and reduce the weight of the second embedded member and the entire blade. The lightweight blade can reduce the load of the load-bearing components such as the main shaft and the tower of the wind turbine, and reduce the energy loss during the operation of the equipment.

[0024] In an alternative embodiment, the segmented blade further comprises a first bearing member and a second bearing member. The first bearing member is fixed to the inner wall surface of the first blade segment, and the first bearing member is internally provided with a plurality of first embedded members. The second bearing member is fixed to the inner wall surface of the second blade segment, and the second bearing member is internally provided with a plurality of embedded sections of the second embedded members.

[0025] Beneficial effects: Multiple first embedded parts are integrated into the first bearing member, and the embedded sections of multiple second embedded parts are integrated into the second bearing member. This allows the connection load between blade segments to be transferred to the bearing member first, and then evenly distributed to the inner wall surface of the blade segment by the bearing member, avoiding the local stress concentration problem that occurs when the embedded parts are directly connected to the blade substrate. At the same time, the first and second bearing members themselves have a certain degree of rigidity, which can help enhance the overall structural strength of the blade segment connection, adapting to the high load requirements of large blades.

[0026] In one optional embodiment, the outer surfaces of the embedded sections of the first and second embedded parts are provided with a plurality of protrusions at intervals.

[0027] Beneficial effects: The protrusion can be embedded in the first or second bearing member to form a mechanical interlocking structure. Compared with the connection method that relies solely on adhesive on a smooth outer surface, mechanical interlocking can significantly improve the pull-out resistance and torsional resistance of the embedded part, and prevent relative displacement or loosening of the embedded part and blade segment when the blade is subjected to alternating wind loads and vibrations, thus fundamentally ensuring the stability of the connection structure.

[0028] In one optional embodiment, the outer surface of the first embedded part is wound with yarn and connected to the first carrier by resin injection; The outer surface of the pre-embedded section is wrapped with yarn and connected to the second carrier through resin injection.

[0029] Beneficial effects: During resin injection, the yarn fully absorbs the resin and fuses with the matrix material of the carrier. Compared to the direct connection between the embedded part and the carrier, the fiber bridging effect of the yarn increases the interface contact area and mechanical interlocking force, which can more evenly transmit the preload and running load, and avoid interface delamination caused by local stress concentration.

[0030] In one optional embodiment, both the first and second support members are provided with stress buffer sections at their ends, and the cross-sectional area of ​​the stress buffer sections gradually decreases.

[0031] Beneficial effects: The stiffness of the load-bearing component is usually higher than that of the composite matrix of the blade segment. If the two are directly rigidly connected, stress concentration is likely to form at the connection interface during load transfer. The stress buffer section, through its gradually decreasing cross-sectional area design, allows the stiffness of the load-bearing component to gradually transition from the tip towards the blade matrix, achieving a smooth stiffness transition, avoiding excessive stress concentration at the connection interface, and reducing the risk of cracking in the blade matrix.

[0032] In one optional embodiment, the first bearing member is provided on both the windward inner wall and the leeward inner wall of the first leaf segment. The second bearing member is provided on both the windward and leeward inner wall surfaces of the second leaf segment.

[0033] Beneficial effects: During blade operation, the windward side bears the main pressure of the wind load, while the leeward side bears the corresponding tension; both are core load-bearing surfaces. Installing load-bearing components on the inner walls of both sides allows the connecting loads between blade segments to be symmetrically transferred through these components, preventing bending, twisting, and other deformations caused by excessive force on one side, thus ensuring the structural accuracy of the blade during long-term operation.

[0034] Secondly, the present invention also provides a wind turbine generator, comprising: Wheel hub; The wind turbine has segmented blades, and there are multiple segmented blades, all of which are mounted on the hub.

[0035] Beneficial effects: This wind turbine, because it includes segmented blades, has the same effects as segmented blades, which will not be elaborated here. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the segmented blades of a wind turbine in one embodiment provided in this application; Figure 2 This is a schematic diagram of the connection structure in the segmented blades of a wind turbine in one embodiment provided in this application; Figure 3 yes Figure 2 A sectional view; Figure 4 yes Figure 3 Enlarged view of the middle box; Figure 5 This is a schematic diagram of the connection structure in the segmented blades of a wind turbine in another embodiment provided in this application; Figure 6 yes Figure 5 A sectional view; Figure 7 yes Figure 6 Enlarged view of the middle box; Figure 8 yes Figure 7 Enlarged schematic diagram of the middle wedge block; Figure 9 This is a schematic diagram of the connection between the first embedded part and the first bearing part in the segmented blade of a wind turbine in one embodiment provided in this application; Figure 10 This is a schematic diagram of the connection between the second embedded part and the second bearing part in the segmented blade of a wind turbine in one embodiment provided in this application.

[0038] Explanation of reference numerals in the attached figures: 1000. Connection structure; 100. First embedded part; 110. Threaded hole; 120. Protrusion; 200. Second embedded part; 210. Embedded section; 211. Weight reduction hole; 220. Box body; 221. Accommodating cavity; 222. Through hole; 223. Mounting groove; 300, tensioning element; 310, bearing end; 320, mating end; 330, external thread; 400, wedge block; 410, first inclined surface; 420, connecting hole; 430, second inclined surface; 500, First slider; 600, Second slider; 2000, First leaf fragment; 2100, Windward side; 2200, Leeward side; 3000, Second Leaf Fragment; 4000, First load-bearing component; 4100, Stress buffer section; 5000, Second load-bearing component. Detailed Implementation

[0039] In related technologies, blade segments are typically connected directly with bolts or by plugging. Bolted connections are prone to loosening under long-term vibration loads, leading to a decrease in preload; plugging connections, on the other hand, suffer from stress concentration and fretting wear. Both methods result in reduced connection tightness between blade segments, making it difficult to maintain stable connection strength over the long term and posing safety hazards.

[0040] In the early stages of the research and development of this application, in order to improve the connection tightness between blade segments, the research and development team first adopted a conventional multi-bolt connection scheme, that is, by circumferentially arranging multiple high-strength bolts on the connection end face of two blade segments, and using a hydraulic tensioner to precisely pre-tighten the bolts, so as to generate sufficient clamping force at the connection interface to ensure the connection strength.

[0041] However, this preliminary solution has proven to have significant limitations in practical application. First, the use of hydraulic tensioners complicates and time-consuming the on-site assembly process, demands high technical skills from operators, and significantly reduces installation efficiency. Second, the tensioner itself is bulky, requiring considerable axial space for operation, which clashes with the narrow, enclosed structural environment inside wind turbine blades, making on-site construction extremely inconvenient and even impossible to implement in certain structural designs.

[0042] Based on this, the inventors of this application redesigned the segmented blades of the wind turbine. When using a connecting structure to connect the first and second blade segments, firstly, a first embedded part is installed inside the connecting end of the first blade segment, and the embedded section of the second embedded part is installed inside the connecting end of the second blade segment, with the housing of the second embedded part extending beyond the connecting end of the second blade segment, ensuring that the first and second embedded parts correspond. Subsequently, the bearing end of the tensioning member is inserted into the receiving cavity of the housing, allowing the mating end of the tensioning member to pass through the through hole and connect with the first embedded part, thus completing the initial connection of the first and second blade segments. Then, a wedge block is installed inside the receiving cavity of the housing. During the process of installing the wedge block into the receiving cavity, the wedge block generates a downward displacement relative to the housing. The first inclined surface converts the downward displacement into a horizontal thrust on the bearing end of the tensioning member, forcing the tensioning member to be stretched axially, thereby generating a preload between the first and second blade segments.

[0043] By continuously applying a preload force away from the first embedded part to the bearing end of the tensioning member through the first inclined surface, a continuous and stable large preload force is generated between the blade segment connection interfaces, forming a stable mechanical self-locking effect. This ensures that the connection structure can maintain extremely high connection stiffness and tightness for a long time under complex load environments. It avoids the problem of preload relaxation caused by vibration in traditional bolt connections, and also overcomes the stress concentration and fretting wear defects of plug-in methods. It can maintain the connection strength between blade segments for a long time and significantly reduce safety hazards.

[0044] In addition, the first inclined surface of the wedge block and the bearing end of the tensioner form a surface contact fit, which can evenly transmit the preload to the connection part and reduce local stress concentration. At the same time, the tensioner directly connects the first embedded part and the second embedded part to form a rigid force chain, which improves the load transfer efficiency between blade segments and meets the working conditions of wind turbines bearing alternating wind loads for a long time.

[0045] Furthermore, during on-site installation, a high-strength connection can be achieved simply by inserting the tensioner and installing the wedge block. This process eliminates the need for large or specialized tensioning equipment (such as hydraulic tensioners), making it simple and quick to operate. This reduces on-site installation time, difficulty, and cost, while also greatly facilitating subsequent maintenance, disassembly, and replacement.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0047] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.

[0048] According to embodiments of the present invention, in one aspect, such as Figures 1 to 10 As shown, a segmented blade for a wind turbine is provided, including a first blade segment 2000, a second blade segment 3000, and a connecting structure 1000, wherein the first blade segment 2000 and the second blade segment 3000 are connected by the connecting structure 1000.

[0049] Specifically, such as Figures 2 to 4 As shown, the connection structure 1000 includes a first embedded part 100, a second embedded part 200, a tensioning part 300, and a wedge block 400.

[0050] Specifically, such as Figures 1 to 4 As shown, the first embedded part 100 is disposed inside the first leaf segment 2000 and located at the connecting section of the first leaf segment 2000.

[0051] Specifically, such as Figures 1 to 4 As shown, the second embedded part 200 includes an embedded section 210 and a housing 220, wherein the embedded section 210 and the housing 220 are connected to each other. The embedded section 210 is disposed inside the second leaf segment 3000 and located at the end of the second leaf segment 3000. When the embedded section 210 is disposed inside the second leaf segment 3000, the housing 220 partially extends out of the connecting end of the second leaf segment 3000.

[0052] Specifically, such as Figures 2 to 4 As shown, a cavity 221 is provided inside the box body 220, and a through hole 222 is also provided on the side wall of the box body 220. The through hole 222 is connected to the cavity 221, and the through hole 222 is opposite to the first embedded part 100.

[0053] Specifically, such as Figure 3 As shown, the tensioning member 300 has a pressure-bearing end 310 and a mating end 320, wherein the pressure-bearing end 310 and the mating end 320 are arranged opposite to each other. The pressure-bearing end 310 is detachably disposed in the receiving cavity 221 of the housing 220, and the mating end 320 is adapted to be detachably connected to the first embedded member 100 through the through hole 222.

[0054] Specifically, such as Figures 2 to 4 As shown, the wedge block 400 is detachably disposed in the receiving cavity 221. The wedge block 400 has a first inclined surface 410, which is disposed opposite to the pressure end 310 and is used to abut against the pressure end 310.

[0055] Specifically, such as Figures 1 to 4 As shown, when the wedge block 400 is installed in the receiving cavity 221, the first inclined surface 410 abuts against the pressure end 310, and the first inclined surface 410 of the wedge block 400 applies a pre-tightening force to the pressure end 310, the direction of which is toward the direction away from the first embedded part 100.

[0056] When connecting the first blade segment 2000 and the second blade segment 3000 using the connecting structure 1000, the first embedded part 100 is first installed in the connecting end of the first blade segment 2000, and the embedded section 210 of the second embedded part 200 is installed in the connecting end of the second blade segment 3000, with the housing 220 of the second embedded part 200 extending out of the connecting end of the second blade segment 3000, ensuring that the first embedded part 100 and the second embedded part 200 correspond. Subsequently, the pressure-bearing end 310 of the tensioning part 300 is inserted into the receiving cavity 221 of the housing 220, so that the mating end 320 of the tensioning part 300 passes through the through hole 222 and connects with the first embedded part 100, thereby completing the initial docking of the first blade segment 2000 and the second blade segment 3000. Then, the wedge block 400 is installed in the receiving cavity 221 of the box body 220. During the process of installing the wedge block 400 into the receiving cavity 221, the wedge block 400 is displaced downward relative to the box body 220. The downward displacement is converted into a horizontal thrust on the bearing end 310 of the tension member 300 through the first inclined surface 410, which forces the tension member 300 to be stretched in the axial direction, thereby generating a preload between the first leaf segment 2000 and the second leaf segment 3000.

[0057] By continuously applying a preload force away from the first embedded part 100 to the bearing end 310 of the tensioning member 300 through the first inclined surface 410, a continuous and stable large preload force is generated between the blade segment connection interfaces, forming a stable mechanical self-locking effect. This ensures that the connection structure 1000 can maintain extremely high connection stiffness and tightness for a long time under complex load environments. It avoids the problem of preload relaxation caused by vibration in traditional bolt connections, and also overcomes the stress concentration and fretting wear defects of plug-in methods. It can maintain the connection strength between blade segments for a long time and significantly reduce safety hazards.

[0058] In addition, the first inclined surface 410 of the wedge block 400 and the pressure-bearing end 310 of the tensioner 300 form a surface contact fit, which can evenly transmit the pre-tightening force to the connection part and reduce local stress concentration. At the same time, the tensioner 300 directly connects the first embedded part 100 and the second embedded part 200 to form a rigid force chain, which improves the load transfer efficiency between blade segments and meets the working conditions of wind turbines bearing alternating wind loads for a long time.

[0059] Furthermore, during on-site installation, a high-strength connection can be achieved simply by inserting the tensioner 300 and installing the wedge block 400. This process eliminates the need for large or specialized tensioning equipment (such as hydraulic tensioners), making it simple and quick to operate. This reduces on-site installation time, difficulty, and cost, while also greatly facilitating subsequent maintenance, disassembly, and replacement.

[0060] Specifically, the segmented leaf can be two leaf segments, or three or four leaf segments, etc., and the leaf segments can be connected using the connecting structure 1000. In the embodiments of this application, there is no specific limitation on the number of leaf segments.

[0061] Specifically, the mating end 320 of the tensioning member 300 and the first embedded part 100 can be connected by thread, snap-fit, pin, etc. In this embodiment, no specific restrictions are placed on the connection method between the mating end 320 and the first embedded part 100.

[0062] In one embodiment, such as Figure 8 As shown, the inclination angle of the first inclined plane is θ, which satisfies 5°≤θ≤12°.

[0063] When 5°≤θ≤12°, the first inclined surface can provide sufficient lateral preload, forming a stable mechanical self-locking effect, ensuring that the connection structure 1000 can maintain extremely high connection stiffness and tightness for a long time under complex load conditions.

[0064] In one embodiment, such as Figure 2 and Figure 3 As shown, the wedge block 400 has multiple connecting holes 420, wherein the axial direction of the connecting holes 420 is angled to the axial direction of the tensioning member 300. The housing 220 has mounting holes, which are corresponding to the connecting holes 420. The wedge block 400 is connected to the corresponding mounting hole through the connecting hole 420 by a connector, so that the wedge block 400 is installed in the receiving cavity 221 of the housing 220.

[0065] The axial direction of the connecting hole 420 is set at an angle to the axial direction of the tensioning member 300. When the connecting member (such as a bolt) is tightened, it will generate an additional clamping force on the wedge block 400 in the inclined direction, causing the wedge block 400 to move downward. During the downward movement of the wedge block 400, the wedge block 400 applies a preload to the bearing end 310 through the first inclined surface 410, ensuring that the preload of the first inclined surface 410 on the tensioning member 300 is stable for a long time.

[0066] The angle setting of the connecting hole 420 restricts the wedge block 400 to move along the direction specified by the connecting hole 420 (e.g., vertically downward) without tilting, jamming, or rotation. This ensures that the first inclined surface 410 of the wedge block 400 can accurately contact the pressure end 310 of the tensioner 300 (or the first slider 500) and slide smoothly, thereby reliably converting the downward displacement into a horizontal preload.

[0067] Specifically, bolts can be used as the connecting parts. When the bolts are rotated, a large axial tensile force can be generated with a small torque. This large axial tensile force acts on the wedge block 400 through the connecting hole 420, driving the wedge block 400 to move. Then, through the first inclined surface 410, the force is amplified again and converted into a horizontal preload. The operator only needs to apply a small torque with a conventional wrench to generate an extremely large preload on the tensioning member 300, avoiding the use of large hydraulic tensioners or torque wrenches, making on-site installation more convenient and economical.

[0068] In one embodiment, such as Figure 3 and Figure 4 As shown, the connecting structure 1000 also includes a first slider 500, which is movably disposed within the receiving cavity 221 and sandwiched between the pressure-bearing end 310 of the tensioning member 300 and the wedge block 400. The first slider 500 has a first mating surface facing the wedge block 400, and the first mating surface and the first inclined surface 410 are in surface contact with each other.

[0069] The first mating surface of the first slider 500 is fully engaged with the first inclined surface 410 of the wedge block 400, allowing the thrust generated by the downward displacement of the wedge block 400 to be uniformly transmitted to the first slider 500 through complete surface contact, and further transmitted to the bearing end 310 of the tensioning member 300. Compared to the wedge block 400 directly contacting the bearing end 310 (which may result in local point / line contact due to processing errors), this avoids local stress concentration, ensures stable transmission of preload along the axial direction of the tensioning member 300, and further enhances the load-bearing capacity of the connecting structure 1000.

[0070] Specifically, in actual production, there may be slight machining errors in the angle of the first inclined surface 410 of the wedge block 400 or the dimensions of the pressure end 310 of the tensioning component 300. Direct assembly may easily lead to loose fit. The first mating surface of the first slider 500 can be finely machined according to the actual error to ensure a tight fit with both the wedge block 400 and the pressure end 310. This solves the assembly problem caused by insufficient machining accuracy of the components and improves the overall assembly tolerance and stability of the connecting structure 1000.

[0071] In one embodiment, such as Figure 3 and Figure 4As shown, the wedge block 400 is further provided with a second inclined surface 430, wherein the second inclined surface 430 is disposed opposite to the first inclined surface 410. The connecting structure 1000 also includes a second slider 600, which is movably disposed within the receiving cavity 221 and is sandwiched between the inner wall of the box 220 and the wedge block 400. The second slider 600 is provided with a second fitting surface, which faces the second inclined surface 430 of the wedge block 400, and the second fitting surface and the second inclined surface 430 are in contact to form a surface contact.

[0072] When the wedge block 400 moves downward, the first inclined surface 410 applies a pushing force to the pressure end 310 of the tensioning member 300 through the first slider 500, while the second inclined surface 430 transmits a reaction force to the inner wall of the housing 220 through the second slider 600. This bidirectional force transmission balances the lateral load on the wedge block 400, preventing it from tilting or getting stuck in the receiving cavity 221, ensuring stable movement of the wedge block 400 along a preset direction, and guaranteeing the linearity and accuracy of the pre-tightening force transmission.

[0073] The second slider 600 is sandwiched between the inner wall of the housing 220 and the wedge block 400. Its second mating surface and the second inclined surface 430 are in close contact, which can evenly transmit the reaction force of the wedge block 400 on the housing 220 to the housing 220 through surface contact, avoiding deformation or damage to the inner wall of the housing 220 due to excessive local stress. At the same time, the second slider 600 can buffer the friction and impact between the wedge block 400 and the housing 220, reduce the direct wear between the two, and extend the service life of the core components, especially suitable for the working conditions where the blades are subjected to alternating loads for a long time.

[0074] In one embodiment, such as Figures 2 to 4 As shown, the housing 220 is also provided with a mounting groove 223, which is located on the same side wall of the housing 220 as the through hole 222. One end of the mounting groove 223 is connected to the through hole 222, and the other end extends to the opening of the receiving cavity 221. The mounting groove 223 is used to guide and receive the tensioning member 300 into the receiving cavity 221.

[0075] One end of the mounting groove 223 is connected to the through hole 222, and the other end extends to the opening of the receiving cavity 221. During assembly, the tensioner 300 can be quickly installed without precise alignment with the through hole 222. Simply slide the tensioner 300 along the mounting groove 223 from the opening, and it will be naturally guided to the position of the through hole 222 and out, improving installation efficiency.

[0076] If the pressure-bearing end 310 of the tensioner 300 is larger than the diameter of the through hole 222 (e.g., the pressure-bearing end 310 is a block or flange-shaped structure), the traditional assembly method relying solely on the through hole 222 will fail to accommodate it due to size conflict. By creating an mounting groove 223 on the housing 220, the pressure-bearing end 310 can be directly placed into the receiving cavity 221, and then the mating end 320 can be inserted into the through hole 222 through the mounting groove 223. This solves the assembly interference problem caused by the size mismatch between the pressure-bearing end 310 and the through hole 222, and adapts to more diverse tensioner 300 structural designs.

[0077] Specifically, the mounting groove 223 can be set as a rectangular groove, a V-shaped groove, etc. In this embodiment, the shape of the mounting groove 223 is not specifically limited.

[0078] Specifically, such as Figures 5 to 7 As shown, if the pressure-bearing end 310 and the mating end 320 of the tensioning member 300 are detachable, or if the pressure-bearing end 310 can be directly inserted into the receiving cavity 221 of the box body 220 through the through hole 222, then it is not necessary to provide the mounting groove 223 on the box body 220.

[0079] In one embodiment, such as Figures 2 to 4 As shown, the first embedded part 100 is provided with a threaded hole 110, which is arranged along the axial direction of the first embedded part 100. The outer surface of the mating end 320 of the tensioning member 300 is provided with an external thread 330, and the external thread 330 is adapted to the internal thread of the threaded hole 110.

[0080] The threaded connection forms a rigid connection through the helical engagement of the external thread 330 at the mating end 320 and the internal thread 110 in the threaded hole. This provides sufficient axial tensile strength and circumferential torsional resistance, enabling it to stably withstand the tensile and torsional forces caused by alternating wind loads and centrifugal forces during blade operation, preventing the connection from loosening. Simultaneously, the large contact surface of the threaded engagement can distribute localized loads, reducing component damage caused by excessive stress at a single point, making it suitable for the harsh operating conditions of wind turbines during long-term outdoor operation.

[0081] The threaded structure has a mature processing technology, requiring no complex molds or special processes, which can reduce the manufacturing cost of the first embedded part 100 and the tensioning part 300, and is suitable for industrial mass production needs. At the same time, the threaded fit does not require additional auxiliary connecting parts, simplifying the overall connection structure 1000, reducing the number of parts, and reducing the difficulty of component adaptation and the probability of errors during assembly.

[0082] In one embodiment, such as Figure 2 As shown, a weight reduction hole 211 is provided in the pre-embedded section 210 along its axial direction.

[0083] By setting weight-reduction holes 211 on the embedded section 210, the amount of material used in the embedded section 210 can be directly reduced, thereby reducing the weight of the second embedded part 200 and the entire blade. Lightweight blades can reduce the load on load-bearing components such as the wind turbine main shaft and tower, and reduce energy loss during equipment operation.

[0084] In one embodiment, such as Figures 1 to 10 As shown, the segmented blade also includes a first support member 4000 and a second support member 5000. The first support member 4000 is fixed to the inner wall of the first blade segment 2000, and a plurality of first embedded parts 100 are provided inside the first support member 4000. The second support member 5000 is fixed to the inner wall of the second blade segment 3000, and a plurality of embedded sections 210 of second embedded parts 200 are provided inside the second support member 5000.

[0085] Multiple first embedded parts 100 are integrated into the first bearing member 4000, and the embedded sections 210 of multiple second embedded parts 200 are integrated into the second bearing member 5000. This allows the connection loads between blade segments (such as preload and wind load) to be transferred to the bearing member first, and then evenly distributed to the inner wall of the blade segment by the bearing member. This avoids the problem of local stress concentration that occurs when the embedded parts are directly connected to the blade substrate. At the same time, the first bearing member 4000 and the second bearing member 5000 themselves have a certain degree of rigidity, which can help enhance the overall structural strength of the blade segment connection and adapt to the high load requirements of large blades.

[0086] During the factory prefabrication stage, multiple first embedded parts 100 or second embedded parts 200 can be precisely fixed at the preset positions of the first bearing part 4000 or the second bearing part 5000 to ensure that the spacing and angle of the first embedded parts 100 and the second embedded parts 200 are consistent. During subsequent assembly, it is only necessary to fix the bearing part with the integrated embedded parts as a whole to the inner wall of the blade segment to ensure that the positions of the first embedded parts 100 and the second embedded parts 200 are accurately corresponding. There is no need to adjust the position of each individual embedded part, which improves installation efficiency and accuracy and avoids the risk of connection failure due to misalignment of embedded parts.

[0087] In one embodiment, such as Figure 2 and Figure 3 As shown, multiple protrusions 120 are provided at intervals on the outer surface of the embedded section 210 of the first embedded part 100 and the second embedded part 200.

[0088] The protrusion 120 can be embedded in the first bearing member 4000 or the second bearing member 5000 to form a mechanical interlocking structure. Compared with the connection method that relies solely on adhesive on the smooth outer surface, mechanical interlocking can significantly improve the pull-out resistance (resistance to being pulled out along the axial direction) and torsional resistance (resistance to circumferential rotation) of the embedded part, and prevent relative displacement or loosening of the embedded part and blade segment when the blade is subjected to alternating wind loads and vibrations, thus fundamentally ensuring the stability of the connection structure 1000.

[0089] Specifically, the protrusion 120 can be a thread, a step, etc. In the embodiments of this application, the structure of the protrusion 120 is not specifically limited.

[0090] In one embodiment, such as Figure 2 , Figure 3 , Figure 9 and Figure 10 As shown, the outer surface of the first embedded part 100 is wound with yarn and connected to the first support part 4000 by resin injection. The outer surface of the embedded section 210 is wound with yarn and connected to the second support part 5000 by resin injection.

[0091] During resin infusion, the yarn fully absorbs the resin and fuses with the matrix material (such as composite material) of the carrier. Compared to the direct connection between the embedded part and the carrier, the fiber bridging effect of the yarn increases the interface contact area and mechanical interlocking force, which can more evenly transmit the preload and running load, and avoid interface delamination caused by local stress concentration.

[0092] The wound yarn itself possesses excellent tensile and fatigue resistance properties. When combined with resin, the resulting composite material layer can integrate the embedded parts and the load-bearing components into a single structure. When the blades are subjected to alternating wind loads and vibrations, this reinforcing layer can buffer the impact force, reduce the relative fretting between the embedded parts and the load-bearing components, prevent loosening of the connection due to long-term fatigue, and significantly improve the fatigue life of the structure.

[0093] In one embodiment, such as Figure 9 and Figure 10 As shown, stress buffer sections 4100 are provided at the ends of both the first bearing member 4000 and the second bearing member 5000, and the cross-sectional area of ​​the stress buffer section 4100 gradually decreases.

[0094] The stiffness of the load-bearing component is usually higher than that of the composite matrix of the blade segment. If the two are directly rigidly connected, stress concentration is likely to form at the connection interface during load transfer. The stress buffer section 4100, through its gradually decreasing cross-sectional area design, allows the stiffness of the load-bearing component to gradually transition from the tip towards the blade matrix, achieving a smooth stiffness transition, avoiding excessive stress concentration at the connection interface, and reducing the risk of cracking in the blade matrix.

[0095] In one embodiment, such as Figures 1 to 10As shown, the inner wall of the windward side 2100 and the inner wall of the leeward side 2200 of the first leaf segment 2000 are both provided with a first bearing member 4000; the inner wall of the windward side 2100 and the inner wall of the leeward side 2200 of the second leaf segment 3000 are both provided with a second bearing member 5000.

[0096] During blade operation, the windward side 2100 bears the main pressure of the wind load, while the leeward side 2200 bears the corresponding tension; both are core load-bearing surfaces. Bearing components are installed on the inner walls of both sides, allowing the connecting loads between blade segments (such as preload and wind load) to be symmetrically transferred through these components. This prevents the blade from bending or twisting due to excessive force on one side, ensuring the structural accuracy of the blade during long-term operation.

[0097] According to an embodiment of the present invention, another aspect provides a wind turbine generator, including a hub and segmented blades of the wind turbine generator.

[0098] Specifically, there are multiple segmented blades, and all of the segmented blades are mounted on the hub.

[0099] This wind turbine, because it includes segmented blades, has the same effect as segmented blades, so it will not be described in detail here.

[0100] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0101] It should be noted that, in this application, 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.

[0102] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "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 application according to the specific circumstances.

[0103] 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.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. A segmented blade for a wind turbine generator, characterized in that, The connecting structure (1000) comprises a first blade segment (2000) and a second blade segment (3000) connected by the connecting structure (1000), and the connecting structure (1000) comprises: A first embedded part (100) is arranged in a connecting end of the first blade segment (2000); A second embedded part (200) comprises a connecting embedded segment (210) and a box body (220), the embedded segment (210) is arranged in a connecting end of the second blade segment (3000), the box body (220) extends out of the connecting end of the second blade segment (3000), the box body (220) is provided with a containing cavity (221), and a through hole (222) is arranged on the box body (220) and communicates with the containing cavity (221), and the through hole (222) is arranged opposite to the first embedded part (100); A tensioning part (300) has opposite pressure bearing ends (310) and butt joint ends (320), the pressure bearing end (310) is detachably arranged in the containing cavity (221), and the butt joint end (320) is suitable for passing through the through hole (222) and detachably connected with the first embedded part (100); A wedge block (400) is detachably arranged in the containing cavity (221), and the wedge block (400) has a first inclined surface (410) abutting against the pressure bearing end (310); When the wedge block (400) is arranged in the containing cavity (221), the first inclined surface (410) abuts against the pressure bearing end (310), and the first inclined surface (410) applies a pre-tightening force to the pressure bearing end (310) in a direction away from the first embedded part (100).

2. A segmented blade for a wind driven electric power generator according to claim 1, wherein, The inclination angle of the first inclined surface is θ, and 5°≤θ≤12°.

3. The segmented blade of a wind driven electric power generator according to claim 1, wherein, A plurality of connecting holes (420) are arranged on the wedge block (400), the axis direction of the connecting hole (420) is arranged at an angle with the axis direction of the tensioning part (300), and a mounting hole is arranged in the box body (220) and corresponds to the connecting hole (420); The wedge block (400) is connected with the corresponding mounting hole through the connecting hole (420) by a connecting part.

4. A segmented blade for a wind driven electric power generator according to claim 3, wherein, The connecting structure (1000) further comprises a first sliding block (500), the first sliding block (500) is movably arranged in the containing cavity (221), and the first sliding block (500) is clamped between the pressure bearing end (310) and the wedge block (400), one side of the first sliding block (500) towards the wedge block (400) is provided with a first matching surface, and the first matching surface is attached to the first inclined surface (410).

5. A segmented blade for a wind driven electric power generator according to claim 4, wherein, The wedge block (400) is further provided with a second inclined surface (430), and the second inclined surface (430) is arranged opposite to the first inclined surface (410); The connecting structure (1000) further comprises a second sliding block (600) movably arranged in the accommodating cavity (221), and the second sliding block (600) is clamped between the inner wall of the box body (220) and the wedge-shaped block (400), one side of the second sliding block (600) towards the wedge-shaped block (400) is provided with a second matching surface, and the second matching surface is attached to the second inclined surface (430).

6. A segmented blade for a wind driven electric power generator according to claim 3, wherein, The box body (220) is further provided with a mounting groove (223) on the side wall of the through hole (222), one end of the mounting groove (223) is communicated with the through hole (222), and the other end extends to the opening of the accommodating cavity (221), and the mounting groove (223) is used for guiding and accommodating the installation of the tensioning member (300) in the accommodating cavity (221).

7. A segmented blade for a wind driven electric power generator according to claim 3, wherein The first embedded part (100) is provided with a threaded hole (110) along the axial direction, and the butt joint end (320) of the tensioning member (300) is provided with an external thread (330) on the outer surface, and the external thread (330) is matched with the internal thread of the threaded hole (110).

8. A segmented blade for a wind driven electric power generator according to claim 3, wherein, The embedded section (210) is provided with a weight-reducing hole (211) along the axial direction.

9. A segmented blade for a wind driven electric power generator according to any one of claims 1 to 8, characterised in that, The segmented blade further comprises a first bearing part (4000) and a second bearing part (5000); The first bearing part (4000) is fixed to the inner wall surface of the first blade segment (2000), and the first bearing part (4000) is internally provided with a plurality of first embedded parts (100); The second bearing part (5000) is fixed to the inner wall surface of the second blade segment (3000), and the second bearing part (5000) is internally provided with a plurality of embedded sections (210) of the second embedded part (200).

10. A segmented blade for a wind driven electric power generator according to claim 9, wherein, A plurality of protruding portions (120) are arranged on the outer surfaces of the first embedded part (100) and the embedded section (210) of the second embedded part (200) at intervals.

11. A segmented blade for a wind driven electric power generator according to claim 10, wherein, The outer surface of the first embedded part (100) is wound with yarn, and is connected with the first bearing part (4000) by resin injection; The outer surface of the embedded section (210) is wound with yarn, and is connected with the second bearing part (5000) by resin injection.

12. A segmented blade for a wind driven electric power generator according to claim 10, wherein, The ends of the first bearing part (4000) and the second bearing part (5000) are provided with stress buffer sections (4100), and the cross-sectional area of the stress buffer section (4100) gradually decreases.

13. The segmented blade of a wind driven electric power generator according to claim 10, wherein, The inner wall surface of the windward surface (2100) and the inner wall surface of the leeward surface (2200) of the first blade segment (2000) are provided with the first bearing part (4000); The inner wall surface of the windward surface (2100) and the inner wall surface of the leeward surface (2200) of the second blade segment (3000) are provided with the second bearing part (5000).

14. A wind driven electrical generator characterised by It comprises: A hub; A segmented blade of the wind driven generator according to any one of claims 1 to 13, a plurality of segmented blades are arranged on the hub.

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