Wind power blade

Abstract

The utility model provides a wind power blade, and relates to the technical field of wind power blades. The wind power blade comprises a blade body and a main beam structural part, the blade body is provided with a main beam and a rear edge in the first direction, the blade body comprises a first blade section and a second blade section which are arranged in the second direction, and the main beam structural part is arranged on the main beam to connect the first blade section with the second blade section. According to the wind power blade, high testing frequency can be guaranteed in the fatigue testing process, and the verification period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind blades, in particular to a wind blade. BACKGROUND

[0002] The wind blade is a core component of a wind turbine generator set, which is responsible for capturing wind energy and converting it into mechanical energy, and then converting it into electrical energy through a generator. The wind blade is widely used in the global market, especially in the field of wind power generation. With the increasing demand for renewable energy worldwide, wind power, as a clean and renewable energy source, has developed rapidly.

[0003] During the fatigue test of the wind blade, the blade truncation position is limited by the rear static load force, which needs to retain a long force arm, resulting in a low test frequency and a long verification period. UTILITARIAN CONTENT

[0004] The purpose of the present application includes, for example, providing a wind blade that can ensure a high test frequency during fatigue testing and shorten the verification period.

[0005] Embodiments of the present application can be implemented as follows:

[0006] The embodiments of the present application provide a wind blade, which includes a blade body and a main beam structure, the blade body has a main beam and a trailing edge along a first direction, the blade body includes a first blade segment and a second blade segment arranged along a second direction, and the main beam structure is arranged on the main beam to connect the first blade segment and the second blade segment, wherein the first direction and the second direction are perpendicular to each other.

[0007] Optionally, the main beam structure includes a first fixed plate, a second fixed plate, a support assembly, and a main beam fastener, the support assembly is arranged inside the blade body, the first fixed plate and the second fixed plate are oppositely arranged on both sides of the main beam along a third direction, the first fixed plate, the second fixed plate, the support assembly, and the first blade segment are connected by the main beam fastener, and the first fixed plate, the second fixed plate, the support assembly, and the second blade segment are connected by the main beam fastener, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0008] Optionally, the support assembly comprises two pressure plates connected with a support plate between the two pressure plates, the two pressure plates are respectively close to the first fixed plate and the second fixed plate, the two pressure plates are in abutment with the inner wall of the blade body, the first fixed plate, the second fixed plate, the pressure plate and the first blade segment are connected through the main beam fastener, and the first fixed plate, the second fixed plate, the pressure plate and the second blade segment are connected through the main beam fastener.

[0009] Optionally, the main beam fastener comprises a plurality of main beam bolts, part of the main beam bolts pass through the first fixed plate, the second fixed plate, the first blade segment and the two pressure plates, and the other part of the main beam bolts pass through the first fixed plate, the second fixed plate, the second blade segment and the two pressure plates.

[0010] Optionally, the blade body is further provided with a web made of glass steel, and the pressure plate is provided with an opening for clamping the web.

[0011] Optionally, the pressure plate and the support plate are made of steel.

[0012] Optionally, the wind blade further comprises a trailing edge structure, which is arranged at the trailing edge to connect the first blade segment and the second blade segment.

[0013] Optionally, the trailing edge structure comprises a fixed block and a trailing edge fastener, the fixed block is arranged at the trailing edge, and the fixed block is connected with the first blade segment and the second blade segment through the trailing edge fastener.

[0014] Optionally, the fixed block comprises a first fixed part, a second fixed part and a connecting part, the first fixed part and the second fixed part are oppositely arranged at two sides of the trailing edge along a third direction, the connecting part is connected between the first fixed part and the second fixed part, the first fixed part, the second fixed part and the first blade segment are connected through the trailing edge fastener, and the first fixed part, the second fixed part and the second blade segment are connected through the trailing edge fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0015] Optionally, the trailing edge fastener comprises a plurality of trailing edge bolts, part of the trailing edge bolts pass through the first fixed part, the second fixed part and the first blade segment, and the other part of the trailing edge bolts pass through the first fixed part, the second fixed part and the second blade segment.

[0016] The wind blade provided by the embodiments of the present application has the advantages of, for example, in order to ensure a high test frequency during fatigue testing and shorten the verification period, a wind blade is designed, which comprises a blade body and a main beam structural member, the blade body has a main beam and a trailing edge along a first direction, the blade body comprises a first blade segment and a second blade segment arranged along a second direction, and the main beam structural member is arranged on the main beam to connect the first blade segment and the second blade segment. When fatigue testing is needed, the main beam structural member is removed, so that the blade body is disconnected at an optimal cutting position of fatigue testing and is divided into the independent first blade segment and the second blade segment, at this time, fatigue testing on the second blade segment can ensure a high test frequency, thereby shortening the verification period, and the first blade segment and the second blade segment can be connected through the main beam structural member during post static loading testing, and the cutting position of the blade body is not limited by the post static loading force. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Fig. 1 The structural schematic diagram of the wind blade in the embodiments of the present application is shown in the figure.

[0019] Fig. 2 The schematic diagram of the support assembly from a first perspective in the embodiments of the present application is shown in the figure.

[0020] Fig. 3 The schematic diagram of the support assembly from a second perspective in the embodiments of the present application is shown in the figure.

[0021] Figure legend: 100-blade body; 110-main beam; 120-trailing edge; 130-first blade segment; 140-second blade segment; 200-main beam structural member; 210-first fixed plate; 220-second fixed plate; 230-support assembly; 231-pressure bearing plate; 2311-aperture; 232-support plate; 300-trailing edge structural member; 310-fixed block; 311-first fixed part; 312-second fixed part; 313-connection part. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application generally described and shown in the drawings can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0024] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0028] The present inventors have found that in the process of fatigue testing of a wind blade, the blade cutting position is limited by the post-static load force and needs to retain a long enough force arm, resulting in a low test frequency and a long verification period. The embodiments of the present application provide a wind blade which can at least solve the above technical problems.

[0029] Please refer to Figs. 1-3The wind blade provided by the embodiments of the present application comprises a blade body 100 and a main beam structure 200, the blade body 100 has a main beam 110 and a trailing edge 120 along a first direction x, the blade body 100 comprises a first blade segment 130 and a second blade segment 140 arranged along a second direction y, and the main beam structure 200 is arranged on the main beam 110 to connect the first blade segment 130 and the second blade segment 140, wherein the first direction x and the second direction y are perpendicular to each other.

[0030] It should be noted that, along the second direction y, the blade body 100 has a blade tip and a blade root, the first blade segment 130 and the second blade segment 140 are arranged along the direction from the blade tip to the blade root, the first blade segment 130 and the second blade segment 140 are two parts of the blade body 100 that are cut off, and the cutting position of the blade body 100 can be an optimal cutting position for fatigue test, for example, the cutting position of the blade body 100 is in the front 10%, the front 20%, the front 30% or the front 40% of the direction from the blade tip to the blade root.

[0031] When fatigue test is needed, the main beam structure 200 is removed, so that the blade body 100 is cut off at the optimal cutting position for fatigue test, and is divided into the independent first blade segment 130 and the second blade segment 140, at this time, fatigue test is performed on the second blade segment 140, which can ensure a high test frequency, thereby shortening the verification period, and the first blade segment 130 and the second blade segment 140 are connected by the main beam structure 200 during the post-static load test, and the cutting position of the blade body 100 is not limited by the post-static load force.

[0032] In some embodiments, the main beam structure 200 comprises a first fixed plate 210, a second fixed plate 220, a support assembly 230 and a main beam fastener, the support assembly 230 is arranged inside the blade body 100, the first fixed plate 210 and the second fixed plate 220 are oppositely arranged on two sides of the main beam 110 along a third direction z, the first fixed plate 210, the second fixed plate 220, the support assembly 230 and the first blade segment 130 are connected by the main beam fastener, and the first fixed plate 210, the second fixed plate 220, the support assembly 230 and the second blade segment 140 are connected by the main beam fastener, wherein the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0033] The inside of the blade body 100 is hollow, the support assembly 230 is arranged in the inside of the blade body 100 to support the blade body 100; the first fixed plate 210 and the second fixed plate 220 are oppositely arranged on the upper and lower sides of the main beam 110 and are located outside the blade body 100; the main beam fastener connects and fixes the first fixed plate 210, the second fixed plate 220, the support assembly 230 and the first blade segment 130, and the main beam fastener connects and fixes the first fixed plate 210, the second fixed plate 220, the support assembly 230 and the second blade segment 140, so that the first blade segment 130 and the second blade segment 140 are relatively fixed.

[0034] In some embodiments, the support assembly 230 includes two pressure bearing plates 231 and a support plate 232 connected between the two pressure bearing plates 231, the two pressure bearing plates 231 are respectively close to the first fixed plate 210 and the second fixed plate 220, and the two pressure bearing plates 231 are in abutment with the inner wall of the blade body 100, the first fixed plate 210, the second fixed plate 220, the pressure bearing plate 231 and the first blade segment 130 are connected by the main beam fastener, and the first fixed plate 210, the second fixed plate 220, the pressure bearing plate 231 and the second blade segment 140 are connected by the main beam fastener.

[0035] The two pressure bearing plates 231 are respectively matched with the first fixed plate 210 and the second fixed plate 220, the main beam fastener is simultaneously provided through the first fixed plate 210, the second fixed plate 220, the two pressure bearing plates 231 and the first blade segment 130, and the main beam fastener is simultaneously provided through the first fixed plate 210, the second fixed plate 220, the two pressure bearing plates 231 and the second blade segment 140, the two pressure bearing plates 231 jointly bear the positive pressure, and the two pressure bearing plates 231 and the support plate 232 connected between the two pressure bearing plates 231 jointly play the effect of supporting and reinforcing the blade body 100.

[0036] It should be pointed out that the number of support plates 232 connected between the two pressure bearing plates 231 can be two or more, which is not limited. In order to adapt to the internal structure of the blade body 100, the support plate 232 can be arranged at an angle relative to the pressure bearing plate 231, for example, the included angle between the support plate 232 and the pressure bearing plate 231 is 90°-95°.

[0037] The main beam 110 contour lines of different models of multi-branch test blades are basically the same, the first fixed plate 210, the second fixed plate 220 and the two pressure bearing plates 231 are all adapted to the contour line of the main beam 110, so that the main beam structure 200 can be reused, adapted to the multi-branch test blade, and the purpose of shortening the installation period and saving cost is achieved.

[0038] In some embodiments, the main beam fastener includes a plurality of main beam bolts, wherein a portion of the main beam bolts pass through the first fixing plate 210, the second fixing plate 220, the first blade segment 130, and the pressure plate 231, and another portion of the main beam bolts pass through the first fixing plate 210, the second fixing plate 220, the second blade segment 140, and the pressure plate 231.

[0039] Optionally, the number of the support assemblies 230 is two, and the two support assemblies 230 are respectively located inside the first blade segment 130 and the second blade segment 140. The two support assemblies 230 are independent components and are convenient to be respectively installed in the first blade segment 130 and the second blade segment 140.

[0040] The plurality of main beam bolts are uniformly and spacedly distributed, and the pressure plate 231 is provided with a plurality of through holes corresponding to the main beam bolts. A portion of the main beam bolts pass through the first fixing plate 210, the second fixing plate 220, the first blade segment 130, and the two pressure plates 231 in the support assembly 230 located in the first blade segment 130, and another portion of the main beam bolts pass through the first fixing plate 210, the second fixing plate 220, the second blade segment 140, and the two pressure plates 231 in the support assembly 230 located in the second blade segment 140, so that the first blade segment 130 and the second blade segment 140 are relatively fixed at the portion of the main beam 110, so as to transmit the main load from the blade root to the blade tip.

[0041] In some embodiments, the blade body 100 is further provided with a web made of glass fiber reinforced plastic, and the pressure plate 231 is provided with a gap 2311 for the web to be clamped into. The pressure plate 231 and the support plate 232 are made of steel and can resist the pre-tightening force of the main beam bolts. The conventional and mature metal processing technology can meet the use requirements and has universality.

[0042] It should be noted that the glass fiber reinforced plastic is a composite material composed of glass fiber and resin, and the existing blade is filled with glass fiber reinforced plastic. In the present embodiment, part of the glass fiber reinforced plastic is replaced by the support assembly 230 composed of the pressure plate 231 and the support plate 232. The support assembly 230 composed of the pressure plate 231 and the support plate 232 is made of steel, which improves the structural strength of the main beam 110 compared with the glass fiber reinforced plastic. The gap 2311 is provided on the pressure plate 231 for the web remaining in the blade body 100 to be clamped into, so that the web and the support assembly 230 have an overlapping portion, and the shear force on the web can be smoothly transmitted.

[0043] It can be understood that the pressure plate 231 and the support plate 232 can also be made of other materials as long as they can improve the structural strength of the main beam 110 compared with the glass fiber reinforced plastic.

[0044] In some embodiments, the wind blade further comprises a trailing edge structure 300 arranged at the trailing edge 120 to connect the first blade segment 130 and the second blade segment 140.

[0045] By arranging the trailing edge structure 300 at the trailing edge 120 of the blade body 100, the trailing edge structure 300 cooperates with the main beam structure 200 to connect the first blade segment 130 and the second blade segment 140, so that the connection of the first blade segment 130 and the second blade segment 140 is more stable.

[0046] In some embodiments, the trailing edge structure 300 comprises a fixing block 310 arranged at the trailing edge 120 and a trailing edge fastener, the fixing block 310 is connected to the first blade segment 130 and the second blade segment 140 by the trailing edge fastener.

[0047] By arranging the fixing block 310 at the trailing edge 120 and connecting the fixing block 310 to the first blade segment 130 and the second blade segment 140 by the trailing edge fastener, the connection of the first blade segment 130 and the second blade segment 140 is more stable.

[0048] In some embodiments, the fixing block 310 comprises a first fixing part 311, a second fixing part 312 and a connecting part 313, the first fixing part 311 and the second fixing part 312 are oppositely arranged at two sides of the trailing edge 120 along the third direction z, the connecting part 313 is connected between the first fixing part 311 and the second fixing part 312, the first fixing part 311, the second fixing part 312 and the first blade segment 130 are connected by the trailing edge fastener, and the first fixing part 311, the second fixing part 312 and the second blade segment 140 are connected by the trailing edge fastener.

[0049] The first fixing part 311 and the second fixing part 312 are arranged at the upper and lower sides of the trailing edge 120, and the connecting part 313 is connected between the first fixing part 311 and the second fixing part 312, so that the first fixing part 311, the second fixing part 312 and the connecting part 313 are substantially in a C-shaped structure as a whole, the trailing edge fastener passes through the first fixing part 311, the second fixing part 312 and the first blade segment 130 at the same time, and the trailing edge fastener passes through the first fixing part 311, the second fixing part 312 and the second blade segment 140 at the same time, so as to fix the fixing block 310 to the trailing edge 120 and play a role of connecting the first blade segment 130 and the second blade segment 140.

[0050] The opposite surfaces of the first fixing part 311 and the second fixing part 312 match the shapes of the upper and lower surfaces of the trailing edge 120, so that the first fixing part 311 and the second fixing part 312 can better fit the trailing edge 120 and better transmit the blade root to tip main load.

[0051] In some embodiments, the trailing edge fastener includes a plurality of trailing edge bolts, wherein a portion of the trailing edge bolts pass through the first fixing portion 311, the second fixing portion 312 and the first blade segment 130, and another portion of the trailing edge bolts pass through the first fixing portion 311, the second fixing portion 312 and the second blade segment 140.

[0052] The plurality of trailing edge bolts are uniformly spaced, wherein a portion of the trailing edge bolts pass through the first fixing portion 311, the second fixing portion 312 and the first blade segment 130 at the same time, and another portion of the trailing edge bolts pass through the first fixing portion 311, the second fixing portion 312 and the second blade segment 140 at the same time, so that the first blade segment 130 and the second blade segment 140 are relatively fixed at a portion of the trailing edge 120, so as to transmit the main load from the blade root to the blade tip.

[0053] In addition, in order to meet the requirement of the whole machine power generation, expand the wind energy utilization efficiency, and tap the potential of low wind speed wind field, the length of the existing blade is designed to be longer and longer, which causes the transportation difficulty. The embodiment of the present application divides the blade body 100 into the first blade segment 130 and the second blade segment 140. If the length of the first blade segment 130 and the second blade segment 140 is already convenient for transportation, the first blade segment 130 and the second blade segment 140 are transported separately in the transportation process, the track bending radius of the on-ramp and off-ramp is reduced, and the transportation problem of the test blade from the blade factory to the test platform is solved. If the length of the second blade segment 140 is too long, the second blade segment 140 can be cut off continuously, so that it reaches the condition of convenient transportation.

[0054] The working principle of the wind blade provided by the embodiment of the present application at least includes: by setting the main beam structure 200 and the trailing edge structure 300 on the blade body 100, the main bending moment and the accompanying load are borne, so that the loading bending moment of the first blade segment 130 can be smoothly conducted to the second blade segment 140; by penetrating and connecting the first fixing plate 210 and the second fixing plate 220 with the bolts, a normal pressure is generated, a friction couple is generated between the fixing plate and the blade body 100, the friction couple generates a reaction bending moment around the airfoil central axis, and the bending moment brought in the test process is balanced.

[0055] In the field of acceleration verification of fatigue test, the original fatigue test needs to cut the blade, and the cutting position of the blade is limited by the rear static load force and needs to keep a long enough force arm. The cutting position of the blade is usually selected as the position of the last loading point in the rear static load test. In the case of meeting the load coverage, the test frequency is not optimal due to the limitation of the cutting position of the blade. For example, taking a blade with a length of 100 meters as an example, the flap frequency is 0.265 Hz and the edgewise frequency is 0.544 Hz when the load coverage is met. The wind turbine blade in the embodiment includes a first blade segment 130 and a second blade segment 140 connected by a main beam structure 200 and a trailing edge structure 300. The wind turbine blade is no longer limited by the rear static load test, and the blade cutting position closer to the blade root can be selected, so that the flap frequency and the edgewise frequency can be improved, for example, the flap frequency is improved to 0.473 Hz and the edgewise frequency is improved to 0.832 Hz. Compared with the original, it is improved by 78.5%, which effectively shortens the fatigue test time, obtains type certification in advance, ensures the timely delivery of products, and reduces the occupation of the test platform and the expenditure of the test cost.

[0056] In the field of rear static load test, due to the shortening of the loading arm after cutting the blade, the maximum loading force of a single point increases when the rear static load test reaches the same bending moment, which is easy to cause new failure modes. Therefore, the wind turbine blade in the embodiment connects the first blade segment 130 and the second blade segment 140 through the main beam structure 200 and the trailing edge structure 300 after fatigue test, so that a longer loading arm can be ensured during the rear static load test, and the loading force is normal when the same bending moment is reached, and the failure situation is not easy to occur.

[0057] In summary, the wind turbine blade provided in the embodiment of the present application includes a blade body 100, a main beam structure 200 and a trailing edge structure 300. The main beam structure 200 is arranged at the main beam 110 of the blade body 100 to connect the first blade segment 130 and the second blade segment 140, and the trailing edge structure 300 is arranged at the trailing edge 120 of the blade body 100 to connect the first blade segment 130 and the second blade segment 140. The wind turbine blade can ensure a higher test frequency during fatigue test and shorten the verification period. The first blade segment 130 and the second blade segment 140 are connected through the main beam structure 200 and the trailing edge structure 300 during the rear static load test, and the cutting position of the blade body 100 is not limited by the rear static load force.

[0058] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A wind blade, characterized in that: The invention comprises a blade body (100) and a main beam structure (200), wherein the blade body (100) has a main beam (110) and a trailing edge (120) along a first direction, and the blade body (100) comprises a first blade segment (130) and a second blade segment (140) arranged along a second direction, and the main beam structure (200) is arranged on the main beam (110) to connect the first blade segment (130) and the second blade segment (140), wherein the first direction and the second direction are perpendicular to each other.

2. The wind blade according to claim 1, characterized in that: The main beam structure (200) includes a first fixing plate (210), a second fixing plate (220), a support assembly (230) and a main beam fastener, wherein the support assembly (230) is arranged inside the blade body (100), the first fixing plate (210) and the second fixing plate (220) are relatively arranged on both sides of the main beam (110) along a third direction, the first fixing plate (210), the second fixing plate (220), the support assembly (230) and the first blade segment (130) are connected by the main beam fastener, and the first fixing plate (210), the second fixing plate (220), the support assembly (230) and the second blade segment (140) are connected by the main beam fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

3. The wind blade according to claim 2, characterized in that: The support assembly (230) includes two pressure plates (231) and a support plate (232) connected between the two pressure plates (231), the two pressure plates (231) are respectively close to the first fixing plate (210) and the second fixing plate (220), the two pressure plates (231) are both in contact with the inner wall of the blade body (100), the first fixing plate (210), the second fixing plate (220), the pressure plate (231) and the first blade segment (130) are connected by the main beam fastener, and the first fixing plate (210), the second fixing plate (220), the pressure plate (231) and the second blade segment (140) are connected by the main beam fastener.

4. The wind blade according to claim 3, characterized in that: The main beam fasteners include a plurality of main beam bolts, wherein a portion of the main beam bolts pass through the first fixing plate (210), the second fixing plate (220), the first blade segment (130) and the pressure plate (231), and another portion of the main beam bolts pass through the first fixing plate (210), the second fixing plate (220), the second blade segment (140) and the pressure plate (231).

5. The wind blade according to claim 3, characterized in that: A web made of glass fiber reinforced plastic is further provided in the blade body (100), and a notch (2311) for the web to be inserted into is provided on the pressure plate (231).

6. The wind blade according to claim 3, characterized in that: The pressure plate (231) and the support plate (232) are both made of steel.

7. The wind blade according to claim 1, characterized in that: The wind blade further comprises a trailing edge structural member (300), wherein the trailing edge structural member (300) is arranged at the trailing edge (120) to connect the first blade segment (130) and the second blade segment (140).

8. The wind blade according to claim 7, characterized in that: The trailing edge structural member (300) comprises a fixing block (310) and a trailing edge fastener. The fixing block (310) is arranged on the trailing edge (120). The fixing block (310) is connected to the first blade segment (130) and the second blade segment (140) via the trailing edge fastener.

9. The wind blade according to claim 8, characterized in that: The fixing block (310) includes a first fixing portion (311), a second fixing portion (312) and a connecting portion (313), wherein the first fixing portion (311) and the second fixing portion (312) are relatively arranged on both sides of the trailing edge (120) along a third direction, and the connecting portion (313) is connected between the first fixing portion (311) and the second fixing portion (312), and the first fixing portion (311), the second fixing portion (312) and the first blade segment (130) are connected via the trailing edge fastener, and the first fixing portion (311), the second fixing portion (312) and the second blade segment (140) are connected via the trailing edge fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

10. The wind blade according to claim 9, characterized in that: The trailing edge fastener includes a plurality of trailing edge bolts, wherein a portion of the trailing edge bolts passes through the first fixing portion (311), the second fixing portion (312) and the first blade segment (130), and another portion of the trailing edge bolts passes through the first fixing portion (311), the second fixing portion (312) and the second blade segment (140).

Images