Blade root structure, wind power blade and wind generating set

Abstract

The invention relates to the technical field of wind power equipment, in particular to a blade root structure, a wind power blade and a wind generating set. The blade root structure comprises an annular base body, the annular base body comprises an inner skin and an outer skin which are distributed in the radial direction of the annular base body, and a containing cavity is formed between the inner skin and the outer skin; the first connecting assembly is arranged in the containing cavity, the first connecting assembly comprises a plurality of first connecting units, and the first connecting units are distributed in the circumferential direction of the annular base body; the pouring pieces are arranged between every two adjacent first connecting units, and the pouring pieces are supported on the inner skin and the outer skin; at least part of the first connecting units in the multiple first connecting units are provided with the second connecting assemblies, and the second connecting assemblies are connected to the adjacent pouring pieces in an inserted mode. According to the blade root structure, the connection strength of the blade root structure can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power equipment, and in particular to a blade root structure, a wind power blade and a wind turbine generator set. Background Art

[0002] Wind turbine blades are the core components of wind turbines, used to capture wind energy and convert it into mechanical energy, which is then converted into electrical energy through the generator in the wind turbine. Wind turbine blades usually have connecting parts arranged in the blade root structure, which are connected to the bearings of the wind turbine through bearing bolts.

[0003] Since wind turbine blades are subjected to high stress during operation, the blade root structure is prone to fatigue failure and peeling. In the related art, the connection strength of the blade root structure is usually improved by adding connecting parts to the blade root structure or reinforcing the injection material between the connecting parts.

[0004] However, the above-mentioned method of improving the connection strength of the blade root structure is not effective, and therefore, a new blade root structure is urgently needed. Summary of the invention

[0005] The present application provides a blade root structure, a wind turbine blade and a wind turbine generator set, so as to solve the problem that the current method of improving the connection strength of the blade root structure is not effective.

[0006] In order to achieve the above purpose, the technical solution of this application is as follows:

[0007] In a first aspect, the present application provides a blade root structure for connecting to a bearing of a wind turbine generator set, the blade root structure comprising: an annular base, the annular base comprising an inner skin and an outer skin distributed along its own radial direction, an accommodating cavity formed between the inner skin and the outer skin; a first connecting component, arranged in the accommodating cavity, the first connecting component comprising a plurality of first connecting units, each of the first connecting units being distributed along the circumference of the annular base; a casting piece, a casting piece is respectively arranged between two adjacent first connecting units, the casting piece is supported by the inner skin and the outer skin; a second connecting component, at least some of the plurality of first connecting units are provided with a second connecting component, the second connecting component is plugged into the adjacently arranged casting piece.

[0008] In a possible implementation, the blade root structure provided by the present application has a plurality of second connection components, the plurality of second connection components are aligned in the circumferential direction, a second connection component is respectively provided on each first connection unit, and each second connection component is plug-fitted with two adjacent casting parts along the circumferential direction.

[0009] In a possible implementation, in the blade root structure provided by the present application, the circumferential extension dimension of the second connection assembly is L, and the axial thickness of the annular base is D, wherein D≤L.

[0010] In one possible implementation, the blade root structure provided by the present application, the second connection assembly includes second connection units arranged in pairs, the second connection units arranged in pairs are distributed radially and enclosed to form a fixed cavity, and the first connection unit is inserted into the accommodating cavity and fixed in a relative position with the second connection assembly.

[0011] In a possible implementation, the blade root structure provided by the present application has a first connecting unit having a first plug-in groove along its own circumference; the casting piece has a second plug-in groove relatively arranged along the circumference, the first plug-in groove is connected to the second plug-in groove, and the second connecting component is plugged into the first plug-in groove and the second plug-in groove.

[0012] In a possible implementation, the blade root structure provided by the present application has a first plug-in groove which is an annular groove extending circumferentially around the first connecting unit, and each second connecting unit is respectively provided with a first plug-in portion on one side facing the first plug-in groove, and each first plug-in portion is plugged into the first plug-in groove.

[0013] In a possible implementation, the blade root structure provided by the present application has an accommodating cavity with an opening along the axial direction of the annular base, and the opening is arranged toward the bearing; the first connecting unit includes a bolt sleeve and a filling piece connected to the bolt sleeve, and the filling piece is located at an end of the bolt sleeve away from the opening; wherein the first plug-in groove is arranged on the bolt sleeve.

[0014] In a possible implementation, the blade root structure provided by the present application has a bolt sleeve having a first end and a second end opposite to each other in the axial direction, the first end is arranged toward the opening, and the first insertion groove is arranged relative to the first end and close to the second end.

[0015] In a possible implementation, in the blade root structure provided by the present application, a coating layer is provided on the outer side of the bolt sleeve.

[0016] In a possible implementation, in the blade root structure provided by the present application, the covering layer includes a first covering segment and a second covering segment, and the first covering segment and the second covering segment are respectively located on two sides of the first insertion slot.

[0017] In a second aspect, the present application provides a wind turbine blade, comprising the above-mentioned blade root structure and a blade body, wherein the blade root structure is arranged on the blade body.

[0018] In a third aspect, the present application provides a wind turbine generator set, comprising the above-mentioned wind turbine blade.

[0019] The blade root structure, wind turbine blade and wind turbine generator set provided by the present application, the blade root structure includes an annular base, a first connecting assembly, a casting piece and a second connecting assembly, the annular base has a receiving cavity, each first connecting unit of the first connecting assembly is distributed in the receiving cavity along the circumference of the annular base, and the first connecting assembly is used to connect with the bearing of the wind turbine generator set. Casting pieces are respectively arranged between two adjacent first connecting units, and the casting pieces are supported by the inner skin and the outer skin to improve the connection strength of the blade root structure. At least some of the first connecting units among the multiple first connecting units are provided with a second connecting assembly, and the second connecting assembly is plugged into the adjacently arranged casting piece. By plugging the second connecting assembly into the first connecting unit and the casting piece adjacent to the first connecting unit, the connection strength between the first connecting unit and the casting piece can be further improved, thereby improving the connection strength of the blade root structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a wind turbine blade provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the middle leaf root;

[0023] Figure 3 for Figure 2 Schematic diagram of some structures in ;

[0024] Figure 4 for Figure 3 Schematic diagram of the structure with the inner skin removed;

[0025] Figure 5 A schematic diagram of the structure of a first connection unit provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of the structure of the first connecting unit and the coating layer provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the structure of a first connecting unit, a coating layer and a potting member provided in an embodiment of the present application;

[0028] Figure 8 A schematic diagram of the connection of a first connection unit, a pouring piece, and a second connection assembly provided in an embodiment of the present application;

[0029] Fig. 9 A partial cross-sectional view of a blade root structure provided in an embodiment of the present application Figure 1 ;

[0030] Fig.10 A partial cross-sectional view of a blade root structure provided in an embodiment of the present application Figure 2 ;

[0031] Fig.11 for Figure 8 A schematic diagram of the structure of the second connection component;

[0032] Fig.12 for Fig.11 A schematic structural diagram of the second connecting unit;

[0033] Fig.13 for Fig.12 Schematic diagram from another perspective.

[0034] Description of reference numerals:

[0035] 1- Wind turbine blades;

[0036] 10-leaf root structure;

[0037] 100-ring base;

[0038] 110-Inner skin;

[0039] 120-outer skin;

[0040] 130 - accommodating chamber; 131 - opening;

[0041] 200-first connection component;

[0042] 210 - first connection unit; 211 - first plug-in slot; 212 - bolt sleeve; 2121 - first end; 2122 - second end; 213 - filling piece;

[0043] 300-filling piece; 310-second plug-in slot;

[0044] 400-second connection component;

[0045] 410 - second connection unit; 411 - first plug-in portion;

[0046] 420-fixed cavity;

[0047] 500-coating layer; 510-first coating section; 520-second coating section;

[0048] 20- blade body;

[0049] X- circumferential direction of the annular base; Y- axial direction of the annular base.

[0050] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0052] It should be noted that in the description of the embodiments of the present application, terms such as "upper", "lower", "inside" and "outside" indicating orientation or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0053] In addition, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] Wind turbine blades are the core components of wind turbines, used to capture wind energy and convert it into mechanical energy, which is then converted into electrical energy through the generator in the wind turbine. Wind turbine blades are usually connected to the bearings of the wind turbine through the connecting parts in the blade root structure.

[0056] Since wind turbine blades are subjected to high stress during operation, the blade root structure is prone to fatigue failure and peeling. In the related art, the connection strength of the blade root structure is usually improved by adding connecting parts to the blade root structure or strengthening the injection material between the connecting parts. However, the above-mentioned method of improving the connection strength of the blade root structure is not effective, so a new blade root structure is urgently needed.

[0057] In view of this, the present application provides a blade root structure, a wind turbine blade and a wind turbine generator set, wherein the blade root structure includes an annular base, a first connection assembly, a casting, and a second connection assembly. The annular base has a receiving cavity, and each first connection unit of the first connection assembly is distributed in the receiving cavity along the circumference of the annular base. The first connection assembly is used to connect with the bearing of the wind turbine generator set. Castings are respectively arranged between two adjacent first connection units, and the castings are 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 connection units are provided with a second connection assembly, and the second connection assembly is plugged into the adjacent casting. By plugging the second connection assembly into the first connection unit and the casting adjacent to the first connection unit, the connection strength between the first connection unit and the casting can be further improved, thereby improving the connection strength of the blade root structure.

[0058] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] See also Figures 2 to 13 The present application provides a blade root structure 10, which is used to connect with a bearing of a wind turbine generator set. The blade root structure 10 may include an annular base 100, a first connection assembly 200, a casting piece 300 and a second connection assembly 400. The annular base 100 may include an inner skin 110 and an outer skin 120 distributed along its radial direction, and an accommodating cavity 130 is formed between the inner skin 110 and the outer skin 120.

[0060] It should be noted that the outer skin 120 is an outer protective layer of the blade root structure 10, which is used to protect the blade root structure 10 from erosion by the external environment. The outer skin 120 generally includes a high-strength, corrosion-resistant material. Optionally, the outer skin 120 may include at least one of a glass fiber composite material and a carbon fiber composite material, 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, and the inner skin 110 may also include at least one of a glass fiber composite material and a carbon fiber composite material.

[0061] An accommodating cavity 130 of the annular base 100 is formed between the inner skin 110 and the outer skin 120 . The first connecting assembly 200 is disposed in the accommodating cavity 130 . The first connecting assembly 200 may include a plurality of first connecting units 210 , and each first connecting unit 210 is distributed along the circumferential direction X of the annular base 100 .

[0062] It is understandable that the first connection 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 set during operation. Optionally, the connection between the first connection unit 210 and the bearing can be one of a bolt connection, a flange connection, and a mortise and tenon connection.

[0063] In order to enhance the integrity and stability of the blade root structure 10, a casting piece 300 is provided between two adjacent first connection units 210. The casting piece 300 not only supports the inner skin 110 and the outer skin 120, but also effectively reduces the gap 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 casting piece 300, the blade root structure 10 can disperse the stress more evenly when subjected to wind force, thereby extending the service life of the blade root structure 10.

[0064] Optionally, the injection piece 300 may include a unidirectional fiber cloth injection block, wherein the unidirectional fiber cloth is a high-performance fiber-reinforced material with good tensile strength. Setting its fiber direction to be consistent with the load direction can improve the connection strength of the blade root structure 10.

[0065] In order to further improve the reliability and stability of the blade root structure 10, among the multiple first connection units 210 of the first connection component 200, at least some of the first connection units 210 are configured with a second connection component 400, and the second connection component 400 can be inserted between adjacently arranged castings 300. In this way, by adding connection points between the first connection unit 210 and the adjacently arranged castings 300, the connection strength between the first connection unit 210 and the casting 300 can be improved, and the peeling failure problem caused by stress concentration between the first connection unit 210 and the casting 300 can be avoided, the connection strength between the blade root structure 10 and the bearing is improved, and the connection reliability between the blade root structure 10 and the bearing is enhanced, which provides a strong guarantee for the stable operation of the wind turbine.

[0066] Optionally, the second connection component 400 may include at least one of a metal material and a composite material.

[0067] It can be understood that by arranging a casting piece 300 between two adjacent first connection units 210 and inserting a second connection assembly 400 between at least part of the first connection unit 210 and the adjacent casting piece 300, the connection strength between the blade root structure 10 and the bearing can be effectively improved, thereby extending the service life of the blade root structure 10.

[0068] See also Figure 4 In some embodiments, there are multiple second connection components 400, and the multiple second connection components 400 are aligned and arranged in the circumferential direction X of the annular base 100. Each first connection unit 210 is respectively provided with a second connection component 400. Along the circumferential direction X, each second connection component 400 is plugged into and matched with two adjacent casting parts 300.

[0069] At least one second connection assembly 400 is disposed on each first connection unit 210 to ensure the integrity and connection strength of the blade root structure 10. Along the circumferential X direction, each second connection assembly 400 forms a tight plug-in fit with two adjacent casting pieces 300.

[0070] Specifically, the second connection component 400 can be connected to the first connection unit 210 and the casting piece 300 by mortise and tenon connection. Through the mortise and tenon connection, the second connection component 400 can be firmly connected between the first connection unit 210 and the casting piece 300, thereby improving the overall stability and bearing capacity of the blade root structure 10.

[0071] In addition, the second connection assemblies 400 are aligned in the circumferential direction X. In this way, the second connection assemblies 400 can bear the transmission of the circumferential X load, which helps to optimize the force distribution of the blade root structure 10 and reduce the risk of damage caused by local stress concentration. It also enhances the cooperative bearing capacity of the first connection unit 210 and the injection piece 300 under multi-directional loads. At the same time, the synergistic effect of multiple second connection assemblies 400 further enhances the overall stiffness and fatigue resistance of the blade root structure 10.

[0072] See also Figure 4 and Fig.11 In some embodiments, the second connection group 400 has an extension dimension L along the circumferential direction X, and a thickness D along the axial direction Y of the annular base 100 , wherein D≤L.

[0073] The second connection assembly 400 extends along the circumferential direction X to a dimension L, where L can be set according to the length of the first connection unit 210 and the adjacent potting piece 300 to ensure that the second connection assembly 400 can form an effective connection with the adjacent potting piece 300 .

[0074] The thickness of the second connection assembly 400 along the axial direction Y of the annular base 100 is D, so as to ensure that the second connection assembly 400 provides sufficient connection strength while not excessively increasing the weight of the blade root structure 10 .

[0075] It should be noted that by setting the thickness of the second connection component 400 to be no greater than the length of the second connection component 400, the weight of the second connection component 400 can be reduced while ensuring the connection strength, thereby improving the overall aerodynamic performance of the wind turbine blade 1. In addition, it is also helpful to optimize the force distribution of the wind turbine blade 1. Under the action of wind force, the wind turbine blade 1 will be subjected to complex bending and torsional moments. The second connection component 400 can effectively disperse the circumferential X load of the blade root structure 10, reduce the risk of local stress concentration, and thus improve the fatigue resistance and durability of the blade root structure 10.

[0076] See also Figures 11 to 13 In some embodiments, the second connection group 400 may include second connection units 410 arranged in pairs, which are radially distributed and enclosed to form a fixed cavity 420, and the first connection unit 210 is inserted into the accommodating cavity 130 and fixed in relative position with the second connection component 400.

[0077] Such a configuration not only ensures a tight fit between the first connection unit 210 and the second connection assembly 400 , but also effectively maintains the relative position stability between the first connection unit 210 and the second connection unit 410 through a physical locking mechanism.

[0078] The second connection component 400 can be configured as a pair or more than a pair of second connection units 410 , and the embodiment of the present application is preferably a pair of second connection units 410 .

[0079] It should be noted that the second connection unit 410 can be optionally an integrally formed part, and the second connection units 410 arranged in pairs are distributed radially. With this arrangement, the second connection unit 410 can effectively transfer and disperse the load of the first connection unit 210 in the circumferential direction X of the annular base 100, thereby improving the reliability and durability of the entire blade root structure 10.

[0080] In addition, plugging the first connection unit 210 and the second connection component 400 not only simplifies the installation process, but also improves the connection efficiency, so that the first connection unit 210 and the second connection component 400 can be firmly connected without additional fasteners or complicated operations.

[0081] See also Figures 7 to 10In some embodiments, the first connecting unit 210 has a first plug-in groove 211 along its own circumference; the casting piece 300 has a second plug-in groove 310 arranged oppositely along the circumference, the first plug-in groove 211 is connected to the second plug-in groove 310, and the second connecting component 400 is plugged into the first plug-in groove 211 and the second plug-in groove 310.

[0082] It should be noted that Fig. 9 It can be understood as a partial cross-sectional schematic diagram of the blade root structure 10 where the second connection unit 410 is not arranged. Fig.10 It can be understood as a partial cross-sectional schematic diagram of the blade root structure 10 where the second connecting unit 410 is inserted.

[0083] It is understandable that the first plug-in slot 211 and the second plug-in slot 310 are connected, so that a continuous and through plug-in channel can be formed between the first connection unit 210 and the potting piece 300. In this way, when the second connection unit 410 is inserted, the stability between the first connection unit 210, the potting piece 300 and the second connection unit 410 can be enhanced, and the physical locking mechanism can effectively prevent the first connection unit 210, the potting piece 300 and the second connection unit 410 from loosening or displacement.

[0084] See also Figure 7 In some embodiments, the first plug-in slot 211 is an annular slot extending circumferentially around the first connecting unit 210, and each second connecting unit 410 is respectively provided with a first plug-in portion 411 on one side facing the first plug-in slot 211, and each first plug-in portion 411 is plugged into the first plug-in slot 211.

[0085] In order to ensure that the second connection unit 410 is firmly connected to the first plug-in slot 211, each second connection unit 410 is provided with a first plug-in portion 411. The shape and size of the first plug-in portion 411 are set to match the first plug-in slot 211. For example, the first plug-in slot 211 is an annular slot, and corresponding to the annular slot, the first plug-in portion 411 can be set as an arc-shaped plug-in portion, ensuring that when the second connection unit 410 is inserted, the first plug-in portion 411 can be smoothly and firmly inserted into the first plug-in slot 211.

[0086] During the plugging process, the first plugging portion 411 of each second connection unit 410 is inserted into the first plugging slot 211 one by one until it is fully in place. The plugging process is not only simple and convenient, but also through the close cooperation between the first plugging portion 411 and the first plugging slot 211, the seamless connection between the first connection unit 210 and the second connection assembly 400 is achieved.

[0087] In addition, the design of the annular groove transforms the plug-in process into a uniform distribution of the first plug-in portion 411 along the circumference of the first connecting unit 210, so that the second connecting unit 410 effectively disperses the load on the first connecting unit 210, avoiding damage to the first connecting unit 210 due to stress concentration, thereby improving the connection strength of the blade root structure 10 and extending the service life of the blade root structure 10.

[0088] See also Figure 3 , Figure 5 and Figure 6 In some embodiments, the accommodating cavity 130 has an opening 131 along the axial direction Y of the annular base 100, and the opening 131 is set toward the bearing; the first connecting unit 210 may include a bolt sleeve 212 and a filling piece 213 connected to the bolt sleeve 212, and the filling piece 213 is located at one end of the bolt sleeve 212 away from the opening 131; wherein the first plug-in groove 211 is set on the bolt sleeve 212.

[0089] By providing an opening 131 in the accommodating cavity 130 along the axial direction Y of the annular base 100 , and the opening 131 is located on the side of the accommodating cavity 130 facing the bearing, the connection between each first connecting unit 210 and the bearing is facilitated.

[0090] 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 matching 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.

[0091] In addition, the first connecting unit 210 may further include a filling piece 213. Optionally, the accommodating cavity 130 formed between the outer skin 120 and the inner skin 110 may have a first inclined surface, and the bolt sleeve 212 is arranged close to the opening 131 relative to the first inclined surface to facilitate connection with the bearing. In order to fill the accommodating cavity 130, a filling piece 213 may be provided at one end of the bolt sleeve 212 away from the opening 131. The filling piece 213 may have a second inclined surface matching the first inclined surface to fill the accommodating cavity 130 and improve the structural stability of the blade root structure 10.

[0092] Optionally, the filler 213 may include polyvinyl chloride foam material.

[0093] It is understandable that the first insertion groove 211 is located in the bolt sleeve 212. In this way, through the connection between the second connecting unit 410 and the first insertion groove 211 and the second insertion groove 310, the load on the bolt sleeve 212 can be effectively dispersed, and the connection strength between the bolt sleeve 212 and the cast part 300 can be improved.

[0094] See also Figure 5 and Figure 6In some embodiments, the bolt 212 sleeve has a first end 2121 and a second end 2122 opposite to each other in the axial direction, the first end 2121 is arranged toward the opening 131 , and the first insertion slot 211 is arranged relative to the first end 2121 and close to the second end 2122 .

[0095] The first plugging slot 211 is arranged closer to the second end 2122 relative to the first end 2121, which can be understood as follows: along the axial direction, the minimum vertical distance from the first plugging slot 211 to the second end 2122 is smaller than the minimum vertical distance from the first plugging slot 211 to the first end 2121.

[0096] During the actual use of the blade 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 arranged closer to the second end 2122 relative to the first end 2121. After the second connecting unit 410 is inserted, the second connecting unit 410 can effectively disperse the circumferential X load and avoid stress concentration at the second end 2122, thereby improving the structural strength of the bolt sleeve 212.

[0097] In a specific implementation, a first plug-in groove 211 can be optionally provided on each bolt sleeve 212, or two or more first plug-in grooves 211 can be provided on each bolt sleeve 212 along its own axial direction, and second plug-in grooves 310 matching the number of the first plug-in grooves 211 can be provided on the adjacent cast member 300, and each first plug-in groove 211 is correspondingly provided with a second connecting unit 410. Such a configuration can further enhance the connection strength between the bolt sleeve 212 and the cast member 300.

[0098] It is understandable that when the bolt sleeve 212 is provided with a plurality of first inserting grooves 211 , the plurality of first inserting grooves 211 on the same bolt sleeve 212 may also be provided close to the second end 2122 relative to the first end 2121 .

[0099] See also Figure 6 In some embodiments, a coating layer 500 is disposed on the outer side of the bolt sleeve 212 .

[0100] The mechanical properties of the bolt sleeve 212 are further enhanced by providing the coating layer 500. The coating 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.

[0101] Optionally, the covering layer 500 may include fiber yarn bundles, such as glass fiber yarns, which are wound around the bolt sleeve 212 to further improve the structural strength.

[0102] See also Figure 5and Figure 6 In some embodiments, the coating layer 500 may include a first coating segment 510 and a second coating segment 520 , and the first coating segment 510 and the second coating segment 520 are respectively located on both sides of the first plug-in slot 211 .

[0103] In a specific implementation, the first covering section 510 is tightly fitted on the bolt sleeve 212 and is located between the second end 2122 and the first insertion slot 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 to prevent the bolt sleeve 212 from deformation or damage.

[0104] 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.

[0105] It should be noted that the first plug-in groove 211 is used for plugging with the second connection assembly 400 to improve the connection strength between the first connection unit 210 and the potting member 300 , and thus, the first plug-in groove 211 does not need to be wrapped with the coating layer 500 .

[0106] Based on the above embodiments, see Figure 1 An embodiment of the present application provides a wind turbine blade 1, comprising a blade root structure 10 and a blade body 20 provided in any of the above embodiments, wherein the blade root structure 10 is arranged on the blade body 20.

[0107] The blade root structure 10 has been described in detail in the above embodiment and will not be described again. By adopting the blade root structure 10 of the present application, the stress concentration under the action of wind force can be effectively dispersed, and the overall service life of the wind turbine blade 1 can be extended.

[0108] On the basis of the above embodiment, an embodiment of the present application provides a wind turbine generator set, including the wind turbine blade 1 provided in the above embodiment.

[0109] The wind turbine blade 1 has been described in detail in the above embodiments and will not be described again here.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A blade root structure, used to connect with a bearing of a wind turbine generator set, characterized in that: The blade root structure (10) comprises: An annular base (100), the annular base (100) comprising an inner skin (110) and an outer skin (120) distributed along the annular base (100) radially, a receiving cavity (130) being formed between the inner skin (110) and the outer skin (120); A first connection assembly (200) is disposed in the accommodating cavity (130), wherein the first connection assembly (200) comprises a plurality of first connection units (210), and each of the first connection units (210) is distributed along the circumference of the annular base (100); A casting piece (300), wherein the casting piece (300) is respectively arranged between two adjacent first connection units (210), and the casting piece (300) is supported by the inner skin (110) and the outer skin (120); A second connection component (400), at least some of the first connection units (210) among the plurality of the first connection units (210) are provided with the second connection component (400), and the second connection component (400) is plugged into the adjacently arranged filling piece (300).

2. The blade root structure according to claim 1, characterized in that: The number of the second connection components (400) is multiple, and the multiple second connection components (400) are aligned in the circumferential direction. Each of the first connection units (210) is respectively provided with a second connection component (400), and along the circumferential direction, each of the second connection components (400) is plug-fitted with two adjacent injection parts (300).

3. The blade root structure according to claim 1, characterized in that: The second connection component (400) has a circumferential extension dimension L, and an axial thickness of the annular base (100) is D, wherein D≤L.

4. The blade root structure according to any one of claims 1 to 3, characterized in that: The second connection assembly (400) comprises second connection units (410) arranged in pairs, the second connection units (410) arranged in pairs are distributed along the radial direction and enclosed to form a fixed cavity (420), and the first connection unit (210) is inserted into the accommodating cavity (130) and fixed in relative position with the second connection assembly (400).

5. The blade root structure according to claim 4, characterized in that: The first connection unit (210) has a first insertion groove (211) along its circumference; The casting piece (300) has second plug-in grooves (310) arranged opposite to each other along the circumferential direction, the first plug-in groove (211) is connected to the second plug-in groove (310), and the second connection assembly (400) is plugged into the first plug-in groove (211) and the second plug-in groove (310).

6. The blade root structure according to claim 5, characterized in that: The first plug-in slot (211) is an annular slot extending circumferentially around the first connecting unit (210), and each of the second connecting units (410) is provided with a first plug-in portion (411) on one side facing the first plug-in slot (211), and each of the first plug-in portions (411) is plugged into the first plug-in slot (211).

7. The blade root structure according to claim 5, characterized in that: The accommodating cavity (130) has an opening (131) along the axial direction of the annular base (100), and the opening (131) is arranged toward the bearing; The first connection unit (210) comprises a bolt sleeve (212) and a filling piece (213) connected to the bolt sleeve (212), wherein the filling piece (213) is located at an end of the bolt sleeve (212) away from the opening (131); Wherein, the first insertion groove (211) is arranged on the bolt sleeve (212).

8. The blade root structure according to claim 7, characterized in that: The bolt sleeve (212) has a first end (2121) and a second end (2122) opposite to each other along the axial direction, the first end (2121) is arranged toward the opening (131), and the first insertion groove (211) is arranged close to the second end (2122) relative to the first end (2121).

9. The blade root structure according to claim 7, characterized in that: A coating layer (500) is provided on the outer side of the bolt sleeve (212).

10. The blade root structure according to claim 9, characterized in that: The covering layer (500) comprises a first covering section (510) and a second covering section (520), wherein the first covering section (510) and the second covering section (520) are respectively located on two sides of the first plug-in slot (211).

11. A wind turbine blade, characterized in that: It comprises a blade root structure (10) and a blade body (20) according to any one of claims 1 to 10, wherein the blade root structure (10) is arranged on the blade body (20).

12. A wind turbine generator set, characterized in that: It comprises the wind turbine blade (1) as claimed in claim 11.

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