Blade root structure, wind power blade, and wind power generator set

Abstract

The present application relates to the technical field of wind power devices, and in particular to a blade root structure, a wind power blade, and a wind power generator set. The blade root structure provided by the present application comprises: an annular base body, the annular base body comprising an inner skin and an outer skin distributed along a radial direction thereof, and an accommodating cavity formed between the inner skin and the outer skin; a first connecting assembly, disposed in the accommodating cavity, the first connecting assembly comprising multiple first connecting units, and the first connecting units being distributed along a circumferential direction of the annular base body; an injection member, the injection member being disposed between adjacent first connecting units, and the injection member being supported on the inner skin and the outer skin; a second connecting assembly, at least a portion of the first connecting units among the multiple first connecting units being provided with a second connecting assembly, and each second connecting assembly being inserted into an adjacently disposed injection member. The blade root structure provided in the present application can increase blade root structure connection strength.

Description

Blade root structure, wind turbine blades and wind turbine generator sets Cross-reference of related applications

[0001] This application claims priority to Chinese patent application 202411524906.3, filed on October 29, 2024, entitled “Blade Root Structure, Wind Turbine Blade and Wind Turbine Generator,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of wind power equipment technology, and in particular to a blade root structure, a wind turbine blade, and a wind turbine generator set. Background Technology

[0003] Wind turbine blades are the core components of wind turbine units, used to capture wind energy and convert it into mechanical energy, which is then converted into electrical energy by the generator in the wind turbine unit. Wind turbine blades typically have connecting components arranged in the blade root structure, which are connected to the bearings of the wind turbine unit via bearing bolts.

[0004] Because wind turbine blades are subjected to significant stress during operation, the blade root structure is prone to fatigue failure and delamination. Related technologies typically improve the connection strength of the blade root structure by adding connecting components or reinforcing the connection between these components with potting material.

[0005] However, the above-mentioned methods for improving the connection strength of the leaf root structure are not effective, therefore, a new leaf root structure is urgently needed. Summary of the Invention

[0006] This application provides a blade root structure, a wind turbine blade, and a wind turbine generator set to solve the problem that current methods for improving the connection strength of blade root structures are not effective.

[0007] To achieve the above objectives, the technical solution of this application is as follows:

[0008] In a first aspect, this application provides a blade root structure for connection with the bearing of a wind turbine generator set. The blade root structure includes: an annular base, the annular base including an inner skin and an outer skin distributed radially thereon, and a receiving cavity formed between the inner skin and the outer skin; a first connecting assembly disposed in the receiving cavity, the first connecting assembly including a plurality of first connecting units, each first connecting unit being distributed circumferentially along the annular base; a filling member, a filling member being disposed between two adjacent first connecting units, the filling member being supported by the inner skin and the outer skin; and a second connecting assembly, at least some of the plurality of first connecting units being provided with a second connecting assembly, the second connecting assembly being inserted into the adjacent filling member.

[0009] In one possible implementation, the leaf root structure provided in this application has multiple second connecting components, which are aligned in the circumferential direction. Each first connecting unit is provided with a second connecting component, and each second connecting component is inserted into two adjacent injection components along the circumferential direction.

[0010] In one possible implementation, the leaf root structure provided in this application has a second connecting component extending circumferentially by a dimension L and having a thickness D along the axial direction of the annular base, where D≤L.

[0011] In one possible implementation, the leaf root structure provided in this application includes a second connecting component comprising a pair of second connecting units arranged radially and enclosing a fixed cavity, wherein a first connecting unit is inserted into the receiving cavity and fixed in relative position to the second connecting component.

[0012] In one possible implementation, the leaf root structure provided in this application has a first connecting unit having a first insertion groove along its circumference; the filling component has a second insertion groove disposed opposite to it along its circumference, the first insertion groove and the second insertion groove being connected, and a second connecting component being inserted into the first insertion groove and the second insertion groove.

[0013] In one possible implementation, the leaf root structure provided in this application has a first insertion groove that is an annular groove extending circumferentially around the first connecting unit, and each second connecting unit is provided with a first insertion part on the side facing the first insertion groove, and each first insertion part is inserted into the first insertion groove.

[0014] In one possible implementation, the blade root structure provided in this application has an opening in the receiving cavity along the axial direction of the annular base, with the opening facing the bearing; the first connecting unit includes a bolt sleeve and a filler connected to the bolt sleeve, with the filler located at the end of the bolt sleeve away from the opening; wherein, a first insertion groove is provided in the bolt sleeve.

[0015] In one possible implementation, the leaf root structure provided in this application has a bolt sleeve having a first end and a second end opposite to each other along the axial direction, the first end being disposed toward the opening, and a first insertion groove being disposed near the second end relative to the first end.

[0016] In one possible implementation, the leaf root structure provided in this application has a covering layer on the outside of the bolt sleeve.

[0017] In one possible implementation, the leaf root structure provided in this application includes a first covering segment and a second covering segment, which are located on both sides of the first insertion groove.

[0018] Secondly, this application provides a wind turbine blade, including the aforementioned blade root structure and blade body, wherein the blade root structure is disposed on the blade body.

[0019] Thirdly, this application provides a wind turbine generator set, including the aforementioned wind turbine blades.

[0020] The blade root structure, wind turbine blade, and wind turbine generator provided in this application include a blade root structure comprising an annular base, a first connecting assembly, a filling component, and a second connecting assembly. The annular base has a receiving cavity, and each first connecting unit of the first connecting assembly is distributed circumferentially within the receiving cavity. The first connecting assembly is used for connection with the bearing of the wind turbine generator. A filling component is respectively provided between two adjacent first connecting units, and the filling component is supported by the inner and outer skins to improve the connection strength of the blade root structure. At least some of the multiple first connecting units are provided with a second connecting assembly, and the second connecting assembly is inserted into an adjacent filling component. By inserting the second connecting assembly into the first connecting unit and the filling component adjacent to the first connecting unit, the connection strength between the first connecting unit and the filling component can be further improved, thereby improving the connection strength of the blade root structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of the structure of the wind turbine blade provided in an embodiment of this application;

[0023] Figure 2 is a schematic diagram of the leaf root structure in Figure 1;

[0024] Figure 3 is a partial structural schematic diagram of Figure 2;

[0025] Figure 4 is a schematic diagram of the structure in Figure 3 after removing the inner skin;

[0026] Figure 5 is a schematic diagram of the structure of the first connection unit provided in an embodiment of this application;

[0027] Figure 6 is a schematic diagram of the structure of the first connecting unit and the covering layer provided in an embodiment of this application;

[0028] Figure 7 is a structural schematic diagram of the first connecting unit, the covering layer, and the injection component provided in an embodiment of this application;

[0029] Figure 8 is a connection diagram of the first connecting unit, the injection component, and the second connecting assembly provided in an embodiment of this application;

[0030] Figure 9 is a partial cross-sectional schematic diagram of the leaf root structure provided in an embodiment of this application;

[0031] Figure 10 is a second partial cross-sectional schematic diagram of the leaf root structure provided in an embodiment of this application;

[0032] Figure 11 is a schematic diagram of the structure of the second connecting component in Figure 8;

[0033] Figure 12 is a schematic diagram of the structure of the second connecting unit in Figure 11;

[0034] Figure 13 is a schematic diagram from another perspective of Figure 12.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Wind turbine blade;

[0037] 10-Leaf root structure;

[0038] 100-Ring matrix;

[0039] 110-Inner skin;

[0040] 120 - Outer skin;

[0041] 130 - Receiving cavity; 131 - Opening;

[0042] 200 - First connecting component;

[0043] 210 - First connecting unit; 211 - First insertion slot; 212 - Bolt sleeve; 2121 - First end; 2122 - Second end; 213 - Filler;

[0044] 300 - Pouring part; 310 - Second insertion slot;

[0045] 400 - Second connection component;

[0046] 410 - Second connecting unit; 411 - First plug-in part;

[0047] 420 - Fixed cavity;

[0048] 500 - Coating layer; 510 - First coating segment; 520 - Second coating segment;

[0049] 20 - Blade body;

[0050] X - circumferential direction of the annular matrix; Y - axial direction of the annular matrix.

[0051] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the preferred embodiments of this application will be described in more detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0053] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0054] Furthermore, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," 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 mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between 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.

[0056] Wind turbine blades are the core components of wind turbine units, used to capture wind energy and convert it into mechanical energy, which is then converted into electrical energy by the generator in the wind turbine unit. Wind turbine blades are typically connected to the bearings of the wind turbine unit through connecting components in the blade root structure.

[0057] Because wind turbine blades are subjected to significant stress during operation, the blade root structure is prone to fatigue failure and delamination. Related technologies typically improve the connection strength of the blade root structure by adding connecting components or reinforcing the connections with grouting materials. However, these methods are not very effective, therefore, a new blade root structure is urgently needed.

[0058] In view of this, the blade root structure, wind turbine blade, and wind turbine generator provided in this application include a blade root structure comprising an annular base, a first connecting assembly, a filling component, and a second connecting assembly. The annular base has a receiving cavity, and each first connecting unit of the first connecting assembly is distributed circumferentially within the receiving cavity. The first connecting assembly is used for connection with the bearing of the wind turbine generator. A filling component is respectively provided between two adjacent first connecting units, and the filling component is supported by the inner skin and the outer skin to improve the connection strength of the blade root structure. At least some of the multiple first connecting units are provided with a second connecting assembly, and the second connecting assembly is inserted into an adjacent filling component. By inserting the second connecting assembly into the first connecting unit and the filling component adjacent to the first connecting unit, the connection strength between the first connecting unit and the filling component can be further improved, thereby improving the connection strength of the blade root structure.

[0059] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0060] Referring to Figures 2 to 13, this application provides a blade root structure 10 for connection with the bearing of a wind turbine generator set. The blade root structure 10 may include an annular base 100, a first connecting assembly 200, an injection component 300, and a second connecting assembly 400. The annular base 100 may include an inner skin 110 and an outer skin 120 distributed radially therefrom, with a receiving cavity 130 formed between the inner skin 110 and the outer skin 120.

[0061] It should be noted that the outer skin 120 is the external protective layer of the blade root structure 10, used to protect the blade root structure 10 from external environmental corrosion. The outer skin 120 typically comprises a high-strength, corrosion-resistant material. Optionally, the outer skin 120 may comprise at least one of glass fiber composite materials and carbon fiber composite materials, which have good mechanical properties and durability. The inner skin 110 is a protective layer coated on the inner side of the annular substrate 100. The inner skin 110 may also comprise at least one of glass fiber composite materials and carbon fiber composite materials.

[0062] An accommodating cavity 130 of an annular base 100 is formed between the inner skin 110 and the outer skin 120. A first connecting component 200 is disposed in the accommodating cavity 130. The first connecting component 200 may include a plurality of first connecting units 210, each of which is distributed along the circumferential direction X of the annular base 100.

[0063] Understandably, the first connecting unit 210 is used to achieve an effective connection between the blade root structure 10 and the bearing, thereby ensuring the stability and safety of the wind turbine generator during operation. Optionally, the connection between the first connecting unit 210 and the bearing can be one of bolted connection, flange connection, or tenon and mortise connection.

[0064] To enhance the integrity and stability of the blade root structure 10, a filling component 300 is provided between two adjacent first connecting units 210. The filling component 300 not only supports the inner skin 110 and outer skin 120, but also effectively reduces the voids inside the blade root structure 10 through its filling effect, thereby improving the fatigue resistance and vibration resistance of the blade root structure 10. By providing the filling component 300, the blade root structure 10 can more evenly distribute stress when subjected to wind force, extending the service life of the blade root structure 10.

[0065] Optionally, the infusion component 300 may include a unidirectional fiber cloth infusion block, wherein the unidirectional fiber cloth is a high-performance fiber-reinforced material with good tensile strength, and setting its fiber direction to be consistent with the load direction can improve the connection strength of the blade root structure 10.

[0066] To further enhance the reliability and stability of the blade root structure 10, at least some of the first connection units 210 in the first connection assembly 200 are equipped with second connection components 400. The second connection components 400 can be inserted between adjacent injection components 300. In this way, by adding connection points between the first connection unit 210 and the adjacent injection component 300, the connection strength between the first connection unit 210 and the injection component 300 can be improved, avoiding the peeling failure problem caused by stress concentration between the first connection unit 210 and the injection component 300. This improves the connection strength between the blade root structure 10 and the bearing, enhances the connection reliability between the blade root structure 10 and the bearing, and provides a strong guarantee for the stable operation of the wind turbine generator set.

[0067] Optionally, the second connecting component 400 may include at least one of a metallic material or a composite material.

[0068] It is understood that by providing a filling component 300 between two adjacent first connecting units 210 and inserting a second connecting component 400 between at least a portion of the first connecting units 210 and the adjacent filling component 300, the connection strength between the blade root structure 10 and the bearing can be effectively improved, and the service life of the blade root structure 10 can be extended.

[0069] Referring to Figure 4, in some embodiments, there are multiple second connecting components 400, which are aligned on the circumferential direction X of the annular base 100. Each first connecting unit 210 is provided with a second connecting component 400, and each second connecting component 400 is inserted into two adjacent injection components 300 along the circumferential direction X.

[0070] Each first connecting unit 210 is provided with at least one second connecting component 400 to ensure the integrity and connection strength of the blade root structure 10. Along the circumferential X direction, each second connecting component 400 forms a tight plug-in fit with two adjacent injection components 300.

[0071] Specifically, the second connecting component 400 can be connected to the first connecting unit 210 and the injection component 300 by mortise and tenon joints. The mortise and tenon joints enable the second connecting component 400 to be stably connected between the first connecting unit 210 and the injection component 300, thereby improving the overall stability and load-bearing capacity of the leaf root structure 10.

[0072] Furthermore, the second connecting components 400 are aligned in the circumferential X direction. This arrangement allows the second connecting components 400 to bear the load transfer in the circumferential X direction, helping to optimize the stress distribution of the blade root structure 10 and reduce the risk of damage caused by local stress concentration. It also enhances the collaborative load-bearing capacity of the first connecting unit 210 and the injection component 300 under multi-directional loads. Simultaneously, the synergistic effect of the multiple second connecting components 400 further enhances the overall stiffness and fatigue resistance of the blade root structure 10.

[0073] Referring to Figures 4 and 11, in some embodiments, the second connecting group 400 extends in the circumferential direction X by a dimension L, and has a thickness D along the axial direction Y of the annular base 100, where D ≤ L.

[0074] The second connecting component 400 extends in the circumferential direction X by a dimension L. L can be set according to the length of the first connecting unit 210 and the adjacent injection component 300 to ensure that the second connecting component 400 can form an effective connection with the adjacent injection component 300.

[0075] The thickness of the second connecting component 400 along the axial direction Y of the annular base 100 is D, to ensure that the second connecting component 400 provides sufficient connection strength without excessively increasing the weight of the blade root structure 10.

[0076] It should be noted that by setting the thickness of the second connecting component 400 to be no greater than its length, the weight of the second connecting component 400 can be reduced while ensuring connection strength, thereby improving the overall aerodynamic performance of the wind turbine blade 1. Furthermore, it helps optimize the stress distribution of the wind turbine blade 1. Under wind force, the wind turbine blade 1 is subjected to complex bending and torsional moments. The second connecting component 400 can effectively disperse the circumferential X load of the blade root structure 10, reducing the risk of local stress concentration, thereby improving the fatigue resistance and durability of the blade root structure 10.

[0077] Referring to Figures 11 to 13, in some embodiments, the second connecting assembly 400 may include a pair of second connecting units 410 arranged radially and enclosing a fixed cavity 420. The first connecting unit 210 is inserted into the receiving cavity 130 and fixed in relative position to the second connecting assembly 400.

[0078] This configuration not only ensures a close fit between the first connecting unit 210 and the second connecting component 400, but also effectively maintains the relative positional stability between the first connecting unit 210 and the second connecting unit 410 through a physical locking mechanism.

[0079] The second connecting component 400 can be configured as a pair or more second connecting units 410, and in this embodiment, a pair of second connecting units 410 is preferred.

[0080] It should be noted that the second connecting unit 410 can be an integrally molded part, and the paired second connecting units 410 are distributed radially. With this configuration, the second connecting unit 410 can effectively transfer and distribute the load of the first connecting unit 210 on the circumferential X of the annular base 100, thereby improving the reliability and durability of the entire blade root structure 10.

[0081] Furthermore, the insertion between the first connecting unit 210 and the second connecting component 400 not only simplifies the installation process but also improves the connection efficiency, enabling the first connecting unit 210 and the second connecting component 400 to achieve a stable connection without the need for additional fasteners or complex operations.

[0082] Referring to Figures 7 to 10, in some embodiments, the first connecting unit 210 has a first insertion groove 211 along its circumference; the injection component 300 has a second insertion groove 310 disposed opposite to it along its circumference, the first insertion groove 211 and the second insertion groove 310 are connected, and the second connecting component 400 is inserted into the first insertion groove 211 and the second insertion groove 310.

[0083] It should be noted that Figure 9 can be understood as a partial cross-sectional schematic diagram of the blade root structure 10 at the location where the second connecting unit 410 is not arranged, and Figure 10 can be understood as a partial cross-sectional schematic diagram of the blade root structure 10 at the location where the second connecting unit 410 is inserted.

[0084] Understandably, the first insertion slot 211 and the second insertion slot 310 are connected, allowing a continuous and through insertion channel to be formed between the first connecting unit 210 and the potting component 300. This arrangement enhances the stability between the first connecting unit 210, the potting component 300, and the second connecting unit 410 when the second connecting unit 410 is inserted. Through a physical locking mechanism, loosening or displacement between the first connecting unit 210, the potting component 300, and the second connecting unit 410 can be effectively prevented.

[0085] Referring to Figure 7, in some embodiments, the first insertion groove 211 is an annular groove extending circumferentially around the first connecting unit 210, and each second connecting unit 410 is provided with a first insertion part 411 on the side facing the first insertion groove 211, and each first insertion part 411 is inserted into the first insertion groove 211.

[0086] To ensure a secure connection between the second connecting unit 410 and the first insertion slot 211, each second connecting unit 410 is provided with a first insertion portion 411. The shape and size of the first insertion portion 411 are designed to match the first insertion slot 211. For example, if the first insertion slot 211 is an annular groove, the first insertion portion 411 can be configured as an arc-shaped insertion portion to ensure that the first insertion portion 411 can be smoothly and securely inserted into the first insertion slot 211 when the second connecting unit 410 is inserted.

[0087] During the insertion process, the first insertion part 411 of each second connecting unit 410 is inserted into the first insertion slot 211 one by one until it is fully in place. The insertion process is not only simple and convenient, but also achieves seamless docking between the first connecting unit 210 and the second connecting assembly 400 through the tight cooperation between the first insertion part 411 and the first insertion slot 211.

[0088] In addition, the design of the annular groove transforms the insertion process into a uniform distribution of the first insertion part 411 along the circumference of the first connecting unit 210, thereby enabling the second connecting unit 410 to effectively distribute the load on the first connecting unit 210, avoiding damage to the first connecting unit 210 due to stress concentration, improving the connection strength of the blade root structure 10, and extending the service life of the blade root structure 10.

[0089] Referring to Figures 3, 5, and 6, in some embodiments, the cavity accommodating 130 has an opening 131 along the axial direction Y of the annular base 100, and the opening 131 is disposed toward the bearing; the first connecting unit 210 may include a bolt sleeve 212 and a filler 213 connected to the bolt sleeve 212, the filler 213 being located at the end of the bolt sleeve 212 away from the opening 131; wherein, a first insertion groove 211 is disposed in the bolt sleeve 212.

[0090] By providing an opening 131 in the receiving cavity 130 along the axial Y of the annular base 100, and with the opening 131 located on the side of the receiving cavity 130 facing the bearing, it is convenient to connect each of the first connecting units 210 to the bearing.

[0091] In a specific implementation, the first connecting unit 210 includes a bolt sleeve 212, which may include an internal thread. A bolt is provided on the bearing, and the bolt has an external thread that matches the internal thread. The first connecting unit 210 is threadedly connected to the bearing through the bolt, so that the blade root structure is connected to the hub through the connection with the bearing.

[0092] In addition, the first connecting unit 210 may also include a filler 213. Optionally, the receiving cavity 130 formed between the outer skin 120 and the inner skin 110 may have a first inclined surface. The bolt sleeve 212 is disposed near the opening 131 relative to the first inclined surface to facilitate connection with the bearing. In order to fill the receiving cavity 130, the end of the bolt sleeve 212 away from the opening 131 may be provided with a filler 213. The filler 213 may have a second inclined surface that matches the first inclined surface to fill the receiving cavity 130 and improve the structural stability of the blade root structure 10.

[0093] Optionally, filler 213 may include polyvinyl chloride foam material.

[0094] It is understandable that the first insertion slot 211 is located on the bolt sleeve 212. In this way, the connection between the second connecting unit 410 and the first insertion slot 211 and the second insertion slot 310 can effectively distribute the load on the bolt sleeve 212 and improve the connection strength between the bolt sleeve 212 and the potting component 300.

[0095] Referring to Figures 5 and 6, in some embodiments, the bolt 212 sleeve has a first end 2121 and a second end 2122 opposite to each other along the axial direction, the first end 2121 being disposed toward the opening 131, and the first insertion groove 211 being disposed near the second end 2122 relative to the first end 2121.

[0096] The first insertion slot 211 being positioned closer to the second end 2122 than the first end 2121 can be understood as follows: along the axial direction, the minimum vertical distance from the first insertion slot 211 to the second end 2122 is less than the minimum vertical distance from the first insertion slot 211 to the first end 2121.

[0097] In the actual use of the leaf root structure 10, the stress at the second end 2122 of the bolt sleeve 212 is more concentrated than that at the first end 2121. The first insertion groove 211 is set closer to the second end 2122 than the first end 2121. After the second connecting unit 410 is inserted, the second connecting unit 410 can effectively disperse the circumferential X load, avoid stress concentration at the second end 2122, and thus improve the structural strength of the bolt sleeve 212.

[0098] In specific implementation, each bolt sleeve 212 may be provided with one first insertion groove 211, or each bolt sleeve 212 may be provided with two or more first insertion grooves 211 along its own axial direction, and the adjacent potting component 300 may be provided with a second insertion groove 310 matching the number of first insertion grooves 211, and each first insertion groove 211 is provided with a corresponding second connection unit 410. This arrangement can further improve the connection strength between the bolt sleeve 212 and the potting component 300.

[0099] It is understandable that when the bolt sleeve 212 is provided with multiple first insertion slots 211, the multiple first insertion slots 211 located on the same bolt sleeve 212 can also be provided close to the second end 2122 relative to the first end 2121.

[0100] Referring to Figure 6, in some embodiments, the outer side of the bolt sleeve 212 is provided with a covering layer 500.

[0101] The mechanical properties of the bolt sleeve 212 are further enhanced by the addition of a covering layer 500. The covering layer 500 can improve the tensile strength, compressive strength and impact resistance of the bolt sleeve 212, thereby ensuring that the bolt sleeve 212 can maintain structural integrity and connection stability when subjected to complex working conditions such as heavy loads and vibrations.

[0102] Optionally, the covering layer 500 may include fiber bundles, such as glass fiber yarns, which are wound onto the bolt sleeve 212 to further improve structural strength.

[0103] Referring to Figures 5 and 6, in some embodiments, the 500-layer covering may include a first covering segment 510 and a second covering segment 520, which are located on both sides of the first insertion slot 211, respectively.

[0104] In practice, the first covering section 510 fits tightly against the bolt sleeve 212 and is located between the second end 2122 and the first insertion groove 211. When the bolt sleeve 212 is subjected to lateral force or torque, the first covering section 510 provides support for the bolt sleeve 212, preventing the bolt sleeve 212 from deforming or being damaged.

[0105] Similarly, the second covering section 520 is located between the first insertion groove 211 and the first end 2121. The second covering section 520 not only enhances the overall structural stability of the bolt sleeve 212, but also further improves the service life of the bolt sleeve 212 under complex working conditions.

[0106] It should be noted that the first insertion slot 211 is used to insert with the second connecting component 400 to improve the connection strength between the first connecting unit 210 and the injection component 300. As a result, the first insertion slot 211 does not need to be wrapped with the covering layer 500.

[0107] Based on the above embodiments, referring to FIG1, this application provides a wind turbine blade 1, including the blade root structure 10 and the blade body 20 provided in any of the above embodiments, wherein the blade root structure 10 is disposed on the blade body 20.

[0108] The blade root structure 10 has been described in detail in the above embodiments and will not be repeated here. By adopting the blade root structure 10 of this application, stress concentration under wind force can be effectively dispersed, and the overall service life of the wind turbine blade 1 can be extended.

[0109] Based on the above embodiments, this application provides a wind turbine generator set, including the wind turbine blade 1 provided in the above embodiments.

[0110] The wind turbine blade 1 has been described in detail in the above embodiments and will not be repeated here.

[0111] 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 blade root structure for connection to a bearing of a wind turbine generator set, said blade root structure (10) comprising: An annular substrate (100) includes an inner skin (110) and an outer skin (120) distributed radially therein, and a receiving cavity (130) is formed between the inner skin (110) and the outer skin (120); A first connecting component (200) is disposed in the receiving cavity (130). The first connecting component (200) includes a plurality of first connecting units (210), and each first connecting unit (210) is distributed circumferentially along the annular base (100). A grouting component (300) is provided between two adjacent first connecting units (210), and the grouting component (300) is supported by the inner skin (110) and the outer skin (120); A second connecting component (400) is provided in at least a portion of the plurality of first connecting units (210), and the second connecting component (400) is inserted into the adjacent injection member (300).

2. The leaf root structure according to claim 1, wherein, The number of the second connecting components (400) is multiple, and the multiple second connecting components (400) are aligned in the circumferential direction. Each first connecting unit (210) is provided with a second connecting component (400). Along the circumferential direction, each second connecting component (400) is inserted and engaged with two adjacent injection parts (300).

3. The leaf root structure according to claim 1, wherein, The second connecting component (400) extends in the circumferential direction by a dimension L and has a thickness D along the axial direction of the annular base (100), wherein D ≤ L.

4. The leaf root structure according to any one of claims 1 to 3, wherein, The second connecting assembly (400) includes a pair of second connecting units (410), which are distributed along the radial direction and enclose a fixed cavity (420). The first connecting unit (210) is inserted into the receiving cavity (130) and fixed in relative position with the second connecting assembly (400).

5. The leaf root structure according to claim 4, wherein, The first connecting unit (210) has a first insertion slot (211) along its circumference; The injection component (300) has a second insertion groove (310) disposed opposite to each other along the circumferential direction, the first insertion groove (211) and the second insertion groove (310) are connected, and the second connecting component (400) is inserted into the first insertion groove (211) and the second insertion groove (310).

6. The leaf root structure according to claim 5, wherein, The first insertion groove (211) is an annular groove extending circumferentially around the first connecting unit (210). Each second connecting unit (410) is provided with a first insertion part (411) on the side facing the first insertion groove (211). Each first insertion part (411) is inserted into the first insertion groove (211).

7. The leaf root structure according to claim 5, wherein, The receiving cavity (130) has an opening (131) along the axial direction of the annular base (100), and the opening (131) is disposed toward the bearing; The first connecting unit (210) includes a bolt sleeve (212) and a filler (213) connected to the bolt sleeve (212), the filler (213) being located at one end of the bolt sleeve (212) away from the opening (131); The first insertion slot (211) is disposed on the bolt sleeve (212).

8. The leaf root structure according to claim 7, wherein, The bolt sleeve (212) has a first end (2121) and a second end (2122) opposite each other along the axial direction, the first end (2121) being disposed toward the opening (131), and the first insertion groove (211) being disposed near the second end (2122) relative to the first end (2121).

9. The leaf root structure according to claim 7, wherein, The outer side of the bolt sleeve (212) is provided with a covering layer (500).

10. The leaf root structure according to claim 9, wherein, The covering layer (500) includes a first covering section (510) and a second covering section (520), the first covering section (510) and the second covering section (520) being located on both sides of the first insertion groove (211).

11. A wind turbine blade, comprising a blade root structure (10) as described in any one of claims 1 to 10 and a blade body (20), wherein the blade root structure (10) is disposed on the blade body (20).

12. A wind turbine generator set, comprising the wind turbine blade (1) as described in claim 11.

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