Main beam structure, wind turbine blades and wind turbine generator sets

Abstract

The present application relates to the technical field of wind power equipment, and in particular to a main beam structure, a wind turbine blade, and a wind turbine generator set. The main beam structure provided by the present application includes: a main beam body, including a plurality of pultruded plates, the plurality of pultruded plates are stacked, the main beam body extends a predetermined length along a first direction, the main beam body has a first end face and a second end face opposite to each other along the first direction, and an outer peripheral surface connected between the first end face and the second end face; a conductive component is arranged on the main beam body and extends along the first direction, the conductive component is surrounded to form a conductive cavity, the main beam body is accommodated in the conductive cavity, and the conductive component is supported on the first end face, the second end face, and the outer peripheral surface. The main beam structure provided by the present application can reduce the probability of arc breakdown between pultruded plates, and improve the safety and service life of the main beam structure.

Description

Technical Field

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

[0002] Wind turbine blades are usually 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. With the update and iteration of wind turbine blades, in order to reduce the weight of wind turbine blades, the main beam of wind turbine blades has gradually developed into a carbon fiber main beam made of carbon fiber material. However, when struck by lightning, when the lightning protection system conducts current, due to electromagnetic induction, electric charges are easily formed in the carbon fiber main beam, causing discharge between the carbon fiber main beam and the lightning protection system, resulting in damage to the main beam. Therefore, it is usually necessary to set protective parts in the main beam to prevent damage to the main beam.

[0003] In the related art, carbon fiber fabrics are usually laid between the pultruded plates of the blade main beam, or at both ends of each pultruded plate, so that the electric potential between the pultruded plates is equal. The main beam is connected to the down conductor and metal mesh of the lightning protection device to be grounded, so that the transient current generated by the lightning strike can be discharged to the ground through the metal mesh and the down conductor.

[0004] However, when the blade is struck by lightning, current will still flow through the pultruded plates, and arc breakdown is likely to occur between the pultruded plates, causing damage to the pultruded plates. Summary of the invention

[0005] The present application provides a main beam structure, a wind turbine blade and a wind turbine generator set, which are used to solve the problem that when the wind turbine blade is struck by lightning, current will still flow through the pultruded plates, arc breakdown is likely to occur between the pultruded plates, and the pultruded plates will be damaged.

[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 main beam structure, comprising: a main beam body, comprising a plurality of pultruded plates, the plurality of pultruded plates are stacked, the main beam body extends a predetermined length along a first direction, the main beam body has a first end face and a second end face opposite to each other along the first direction, and an outer peripheral face connected between the first end face and the second end face; a conductive component, arranged on the main beam body and extending along the first direction, the conductive component is surrounded to form a conductive cavity, the main beam body is accommodated in the conductive cavity, and the conductive component is supported on the first end face, the second end face and the outer peripheral face.

[0008] In a possible implementation, the main beam structure provided by the present application, the conductive component includes at least one conductive member, and the conductive member includes at least one of a planar conductive member, a mesh conductive member, a spiral strip conductive member, and a strip conductive member.

[0009] In a possible implementation, in the main beam structure provided by the present application, the conductive component is arranged around the outer peripheral surface, and the conductive component extends along the outer peripheral surface to form a closed ring.

[0010] In one possible implementation, the main beam structure provided by the present application, the conductive component includes a conductive member, the conductive member has a first overlapping portion and a second overlapping portion relative to each other, the extension length of the conductive member along the outer peripheral surface is greater than the circumference of the corresponding area of ​​the outer peripheral surface, and the first overlapping portion and the second overlapping portion are partially overlapped.

[0011] In a possible implementation, the main beam structure provided by the present application, the conductive component includes more than two conductive parts, the more than two conductive parts are distributed in sequence around the outer peripheral surface and enclosed to form a conductive cavity, and two adjacent conductive parts are arranged to overlap at one end facing each other.

[0012] In one possible implementation, the main beam structure provided by the present application, the conductive component includes a first conductive member and a second conductive member, the first conductive member and the second conductive member are sequentially distributed around the outer peripheral surface and enclosed to form a conductive cavity, and the first conductive member and the second conductive member are overlapped at one end facing each other.

[0013] In a possible implementation, in the main beam structure provided by the present application, the first conductive member and the second conductive member are respectively provided as one, the first conductive member extends along the outer circumferential surface to be wrapped around at least part of the outer circumferential surface, and the two ends of the first conductive member are bent in directions toward each other; the second conductive member is covered between the two ends of the first conductive member and is partially overlapped with the first conductive member.

[0014] In a possible implementation, the main beam structure provided by the present application is provided with two first conductive members and two second conductive members respectively, the two first conductive members are located on opposite sides of the outer peripheral surface, and both ends of the two first conductive members are bent in directions toward each other; the two second conductive members and the two first conductive members are alternately distributed on the outer peripheral surface.

[0015] In a possible implementation, in the main beam structure provided by the present application, the conductive member is spirally wound around the outer peripheral surface in a first direction.

[0016] In a possible implementation, the main beam structure provided by the present application has a plurality of conductive members, at least one of which is spirally wound around the outer peripheral surface in a first direction; at least one is extended along a straight trajectory in the first direction, and the conductive member spirally wound around the outer peripheral surface overlaps with the conductive member extending along the straight trajectory at a portion of their orthographic projection on the outer peripheral surface.

[0017] In the second aspect, the present application provides a wind turbine blade, including a blade shell and the above-mentioned main beam structure, the main beam structure is arranged on the blade shell; the blade shell is provided with a metal mesh and a down conductor, and the conductive component, the metal mesh and the down conductor are connected at the same potential.

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

[0019] The main beam structure, wind turbine blade and wind turbine generator set provided by the present application, the main beam structure includes a main beam body and a conductive component, the main beam body includes a plurality of stacked pultruded plates, the main beam body has a first end face, a second end face and an outer peripheral surface. The conductive component is arranged to form a conductive cavity, the main beam body is arranged inside the conductive cavity, and the conductive component is supported on the first end face, the second end face and the outer peripheral surface, so that the conductive cavity formed by the conductive component is in a closed cavity shape outside the main beam body, so that when encountering a lightning strike, the closed cavity-shaped conductive cavity forms a conductor outside the main beam body, and the transient current generated by the lightning strike flows through the conductive component, and is guided by the conductive component to the down conductor and other structures, but does not flow through or flows very little through the pultruded plates, which can reduce the probability of arc breakdown between the pultruded plates, and improve the safety and service life of the main beam 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 A schematic diagram of the main beam structure provided in the embodiment of the present application Figure 1 ;

[0023] Figure 3 A schematic diagram of the main beam structure provided in the embodiment of the present application Figure 2 ;

[0024] Figure 4 A schematic diagram of the main beam structure provided in the embodiment of the present application Figure 3 ;

[0025] Figure 5 A schematic diagram of the main beam structure provided in the embodiment of the present application Figure 4 ;

[0026] Figure 6 A schematic diagram of the main beam structure provided in the embodiment of the present application Figure 5 ;

[0027] Figure 7 A schematic diagram of the main beam structure provided in the embodiment of the present application Figure 6 .

[0028] Description of reference numerals:

[0029] 10- Main beam structure;

[0030] 100-main beam body;

[0031] 110-pultruded board;

[0032] 120- first end surface;

[0033] 130- second end surface;

[0034] 140-outer peripheral surface;

[0035] 200-conductive component;

[0036] 210-conductive cavity;

[0037] 220-conductive member; 221-first overlapping portion; 222-second overlapping portion;

[0038] 230-first conductive member;

[0039] 240- a second conductive member;

[0040] 20-blade shell; 21-metal mesh; 22-down conductor;

[0041] X - first direction.

[0042] 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

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Wind turbine blades are usually 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. With the update and iteration of wind turbine blades, in order to reduce the weight of wind turbine blades, the main beam of wind turbine blades has gradually developed into a carbon fiber main beam made of carbon fiber material. However, when struck by lightning, when the lightning protection system conducts current, due to electromagnetic induction, electric charges are easily formed in the carbon fiber main beam, causing discharge between the carbon fiber main beam and the lightning protection system, resulting in damage to the main beam. Therefore, it is usually necessary to set protective parts in the main beam to prevent damage to the main beam.

[0048] In the related art, carbon fiber fabric is usually laid between the pultruded plates of the blade main beam, or at both ends of each pultruded plate, so that the electric potential between the pultruded plates is equal. The main beam is connected to the down conductor and metal mesh of the lightning protection device and grounded, so that the transient current generated by the lightning strike can flow to the ground through the metal mesh and the down conductor. However, when the blade is struck by lightning, current will still flow through the pultruded plate, and arc breakdown is likely to occur between the pultruded plates, causing damage to the pultruded plates.

[0049] In view of this, the main beam structure, wind turbine blade and wind turbine generator set provided by the present application, the main beam structure includes a main beam body and a conductive component, the main beam body includes a plurality of stacked pultruded plates, and the main beam body has a first end face, a second end face and an outer peripheral surface. The conductive component is arranged to form a conductive cavity, the main beam body is arranged inside the conductive cavity, and the conductive component is supported on the first end face, the second end face and the outer peripheral surface, so that the conductive cavity formed by the conductive component is in a closed cavity shape outside the main beam body. In this way, when encountering a lightning strike, the closed cavity-shaped conductive cavity forms a conductor outside the main beam body, and the transient current generated by the lightning strike flows through the conductive cavity, but does not flow through or flows through the pultruded plate in very small amounts, which can reduce the probability of arc breakdown between the pultruded plates and improve the safety and service life of the main beam structure.

[0050] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] See also Figures 1 to 7 The present application provides a main beam structure 10, which may include a main beam body 100 and a conductive component 200. The main beam body 100 includes a plurality of pultruded plates 110, which are stacked, and the main beam body 100 extends a predetermined length along a first direction X. The main beam body 100 has a first end face 120 and a second end face 130 opposite to each other along the first direction X, and an outer peripheral face 140 connected between the first end face 120 and the second end face 130.

[0052] The first direction X may be understood as the length direction of the main beam body 100 .

[0053] The conductive component 200 is disposed on the main beam body 100 and extends along the first direction X. The conductive component 200 is surrounded by a conductive cavity 210 . The main beam body 100 is accommodated in the conductive cavity 210 , and the conductive component 200 is supported by the first end surface 120 , the second end surface 130 and the outer peripheral surface 140 .

[0054] The conductive component 200 may be disposed in close contact with the first end surface 120 , the second end surface 130 and the outer peripheral surface 140 . Alternatively, a glass fiber layer may be disposed between the conductive component 200 and the main beam body 100 .

[0055] It is understandable that the main beam body 100 is stacked with multiple pultruded plates 110, which can enhance the overall strength and stability of the main beam body 100, and facilitate the adjustment of the number of stacking according to actual needs to achieve ideal load-bearing and bending resistance. In addition, the pultruded plates 110 usually include carbon fibers, so that the weight of the main beam body 100 can be reduced.

[0056] In order to improve the lightning protection effect of the main beam structure 10 , the main beam structure 10 may be provided with a conductive component 200 , and the conductive component 200 is supported on the first end surface 120 , the second end surface 130 and the outer peripheral surface 140 .

[0057] In some optional embodiments, the conductive cavity 210 formed by the conductive assembly 200 is in a closed cavity shape outside the main beam body 100. The closed cavity shape mentioned above can be a completely closed cavity with multiple closed faces, or a cage-shaped cavity with a polygonal opening or a spiral opening connected to the outside of the conductive cavity. In other words, the conductive assembly 200 is arranged on any side of the main beam body 100, and the conductive cavity 210 surrounds the main beam body 100 inside the conductive cavity 210. This arrangement improves the conductive performance of the main beam structure 10. The closed cavity-shaped conductive cavity 210 forms an electromagnetic shield for the main beam body 100. When a lightning strike occurs, the closed cavity-shaped conductive cavity 210 forms a conductor outside the main beam body 100. The transient current generated by the lightning strike flows through the conductive cavity 210 instead of flowing through the pultruded plate 110, which can reduce the probability of arc breakdown between the pultruded plates 110.

[0058] It should be noted that the closed cavity-shaped conductive cavity 210 is an equipotential body, the internal potential of the conductive cavity 210 is zero, and the electric field is zero. When struck by lightning, the conductive cavity 210 protects its interior from the influence of the external electric field, that is, it protects the main beam body 100. Due to the skin effect and skin depth characteristics of transient current, the current can be prevented from flowing through the pultruded plate 110. Compared with the related art, the pultruded plate 110 and the conductive material jointly form a conductor. The main beam structure 10 provided in the present application can reduce the probability of arc breakdown between the pultruded plates 110, improve the lightning protection effect of the main beam structure 10, and improve the safety and service life of the main beam structure 10.

[0059] The conductive component 200 may include carbon fiber fabric.

[0060] In addition, the conductive component 200 is arranged on the outer surface of the main beam body 100. When the conductive component 200 is damaged, compared with the related art of setting conductive materials between layers of the pultruded plate 110, the main beam structure 10 provided in the present application is convenient for inspection and maintenance, thereby improving the maintenance efficiency.

[0061] See also Figure 2 , Figure 6 and Figure 7 In some embodiments, the conductive component 200 may include at least one conductive member 220, and the conductive member 220 may include at least one of a planar conductive member, a mesh conductive member, a spiral strip conductive member, and a strip conductive member, and may also include a combination of any two, three or four of the planar conductive member, the mesh conductive member, the spiral strip conductive member, and the strip conductive member.

[0062] Optionally, the conductive assembly 200 may include a planar conductive member, which can increase the conductive area, improve the current conduction effect, and is easy to install. By using the planar conductive member, a completely closed cavity can be formed outside the main beam body 100.

[0063] The conductive component 200 may also include a mesh conductive member. The grid structure of the mesh conductive member can increase the conductive area. When struck by lightning, it can quickly guide the current to the ground, effectively avoiding local overheating or arc breakdown caused by current concentration, and protecting the integrity of the main beam structure 10.

[0064] In addition, the conductive assembly 200 may include a spiral strip conductive member and a strip conductive member, which are easy to install and can effectively avoid local overheating or arc breakdown caused by current concentration when struck by lightning. The spiral strip conductive member can be spirally wound around the main beam body 100, and the strip conductive member can be laid flat on the main beam body 100.

[0065] It can be understood that by using mesh conductive parts, spiral strip conductive parts and strip conductive parts, the amount of conductive material can be reduced while ensuring the lightning protection effect, effectively reducing the weight of the main beam structure 10 and reducing the manufacturing cost.

[0066] See also Figures 2 to 5 In some embodiments, the conductive component 200 is disposed around the outer peripheral surface 140 , and the conductive component 200 extends along the outer peripheral surface 140 to form a closed ring.

[0067] The closed loop conductive component 200 ensures that the conductive component 200 fully covers the outer peripheral surface 140 of the main beam body 100. This arrangement improves the continuity and stability of the conductive conduction, effectively prevents leakage and interference of the current during the transmission process, and thus avoids current flowing through the main beam body 100.

[0068] In addition, the closed-loop conductive component 200 can be smoothly arranged on the outer peripheral surface 140 of the main beam body 100 to avoid the formation of a discharge tip on the outer peripheral surface 140, thereby avoiding heating, flashover and other problems caused by the discharge tip when the current is discharged, thereby avoiding damage to the main beam body 100.

[0069] It can be understood that the conductive component 200 forms a conductive cavity 210 outside the main beam body 100, and the conductive cavity 210 is a closed cavity. That is, the conductive component 200 can also be smoothly arranged on the first end face 120 and the second end face 130 of the main beam body 100 to avoid the end of the conductive component 200 protruding from the conductive cavity 210, thereby avoiding the formation of a discharge tip on the main beam body 100.

[0070] See also Figure 2 In some embodiments, the conductive component 200 may include a conductive member 220 having a first overlapping portion 221 and a second overlapping portion 222 relative to each other. The extension length of the conductive member 220 along the outer peripheral surface 140 is greater than the circumference of the corresponding area of ​​the outer peripheral surface 140, and the first overlapping portion 221 and the second overlapping portion 222 are partially overlapped.

[0071] In a specific implementation, the extension length of the conductive member 220 along the outer peripheral surface 140 is set to be greater than the perimeter of the corresponding area of ​​the outer peripheral surface 140, so that the first overlapping portion 221 and the second overlapping portion 222 can be partially overlapped.

[0072] The partial overlap between the first overlap portion 221 and the second overlap portion 222 can enhance the structural stability of the conductive component 200. Through the overlap of the first overlap portion 221 and the second overlap portion 222, the conductive member 220 forms a more solid contact surface at the connection, effectively preventing the connection from loosening or breaking. This improves the durability of the conductive component 200, ensures the current guiding effect of the conductive component 200, avoids leakage and interference of current during transmission, and further protects the main beam body 100 and avoids damage to the main beam body 100.

[0073] Optionally, the overlapping width of the first overlapping portion 221 and the second overlapping portion 222 can be any value between 10 mm and 15 mm, including 10 mm, 15 mm, etc., and the present application does not limit this.

[0074] It should be noted that when installing the conductive member 220 , it can be laid during the assembly process of the pultruded plate 110 , it can also be laid when the main beam body 100 is formed, or it can be laid when the wind turbine blade shell is laid. Specifically, when laying the conductive member 220 during the assembly process of the pultruded plate 110, the conductive member 220 is first laid on the jig frame, and then the pultruded plates 110 are stacked on the conductive member 220 in sequence. After the pultruded plates 110 are stacked, the first overlap portion 221 and the second overlap portion 222 are folded, and the first overlap portion 221 and the second overlap portion 222 are overlapped to cover each pultruded plate 110 in the conductive member 220; when laying the conductive member 220 during the main beam forming process, the pultruded plates 110 are first stacked on the jig frame, and then the conductive member 220 is laid in the main beam forming mold, the stacked main beam body 100 is placed in the main beam forming mold, and then the first overlap portion 221 and the second overlap portion 222 are folded and overlapped to cover the main beam body 100 in the conductive member 220, and then the main beam structure 10 is injection molded. When laying the conductive member 220 during the plying of the wind turbine blade shell, the conductive member 220 is laid in the wind turbine blade shell mold, and then the poured main beam body 100 is placed, and then the first overlap portion 221 and the second overlap portion 222 are folded and overlapped to cover the main beam body 100 in the conductive member 220.

[0075] Among them, the length of the conductive member 220 in the first direction X can be greater than the length of the main beam body 100, so that the two ends of the conductive member 220 can be folded to support the first end face 120 and the second end face 130 of the main beam body 100; or, the conductive member 220 can be cut into multiple pieces and installed separately to be set on the outer peripheral surface 140, the first end face 120 and the second end face 130 of the main beam body 100. Of course, the present application is not limited here.

[0076] In some embodiments, the conductive component 200 may include more than two conductive members 220 , which are sequentially distributed around the outer peripheral surface 140 and enclose a conductive cavity 210 , and two adjacent conductive members 220 are overlapped at one end facing each other.

[0077] The number of conductive parts 220 included in the conductive component 200 can be two, three, four, five or more. The structural forms of the conductive parts 220 can be the same, partially the same, or different, and can be set according to the outer contour shape of the main beam body 100.

[0078] In a specific implementation, the conductive members 220 are sequentially distributed around the outer peripheral surface 140 and enclosed to form a conductive cavity 210, providing comprehensive and effective protection for the main beam body 100. Adjacent conductive members 220 are arranged to overlap each other at one end, which enhances the overall structural strength of the conductive assembly 200 and ensures the current conduction performance of the conductive assembly 200. This arrangement enables the instantaneous current to be quickly and evenly conducted through the conductive cavity 210, effectively reducing the impact of lightning on the main beam body 100 and improving the lightning protection performance of the main beam structure 10.

[0079] In addition, the number of the conductive members 220 in the conductive assembly 200 increases, and the staff can flexibly adjust the number, distribution and overlap of the conductive members 220 according to the size and shape of the main beam body 100 and the specific requirements of lightning protection to improve the lightning protection effect. This arrangement not only improves the lightning protection performance of the wind turbine blade, but also helps to reduce the manufacturing cost and improve the economic efficiency of the wind turbine blade.

[0080] See also Figures 3 to 5 In some embodiments, in order to better understand the structure when the conductive component 200 includes more than two conductive members 200 , the following will use the form of a first conductive member 230 and a second conductive member 240 to distinguish between two or more different conductive members 200 .

[0081] Optionally, the conductive component 200 may include a first conductive member 230 and a second conductive member 240 , which are sequentially distributed around the outer peripheral surface 140 and enclose a conductive cavity 210 , and the first conductive member 230 and the second conductive member 240 are overlapped at one end thereof.

[0082] When lightning strikes a wind turbine blade, the first conductive member 230 and the second conductive member 240 can quickly guide the current to be distributed along the conductive cavity 210, avoiding single-point damage to the main beam body 100 caused by current concentration, thereby improving the lightning protection capability of the main beam structure 10 and ensuring the safe operation of the wind turbine.

[0083] The overlapping arrangement of the first conductive member 230 and the second conductive member 240 not only enhances the structural strength of the conductive assembly 200 itself, but also provides support and protection for the main beam body 100 through the formation of the conductive cavity 210, which helps to extend the service life of the wind turbine blades and reduce the maintenance and replacement costs caused by lightning disasters.

[0084] The length of the first conductive member 230 extending along the outer peripheral surface 140 may be greater than that of the second conductive member 240 , so as to facilitate the sequential installation of the first conductive member 230 and the second conductive member 240 .

[0085] See also Figure 3In some embodiments, the first conductive member 230 and the second conductive member 240 can be provided as one each, the first conductive member 230 extends along the outer circumference 140 to be disposed around at least a portion of the outer circumference 140, and the two ends of the first conductive member 230 are bent in directions toward each other. The second conductive member 240 is disposed between the two ends of the first conductive member 230 and partially overlaps with the first conductive member 230.

[0086] The overlapping portion between the first conductive member 230 and the second conductive member 240 not only increases the conductive area, but also improves the efficiency of current transmission, so that when the main beam structure 10 faces a lightning strike, it can guide the current to the ground more quickly and effectively, thereby reducing the damage to the main beam structure 10 caused by lightning.

[0087] When installing the first conductive member 230 and the second conductive member 240, the first conductive member 230 can be laid first, and then the pultruded plates 110 are stacked in sequence, and the two ends of the first conductive member 230 in the width direction of the pultruded plates 110 are folded along the thickness direction of the pultruded plates 110, and then the two ends of the first conductive member 230 are folded again in the direction toward each other, and then the second conductive member 240 is laid on each pultruded plate 110, and the ends of the first conductive member 230 and the second conductive member 240 facing each other are overlapped, so that the main beam body 100 is located in the conductive cavity 210, and the main beam body 100 is covered in this way to avoid the formation of a discharge tip on the main beam body 100, and further avoid the main beam body 100 from being damaged by lightning. In addition, the first conductive member 230 and the second conductive member 240 can also be laid when the main beam is formed, and can also be laid when the wind turbine blade shell is laid.

[0088] In a specific implementation, the length of the first conductive member 230 in the first direction X may be greater than that of the second conductive member 240. In this way, when the first conductive member 230 and the second conductive member 240 are sequentially covered on the outer peripheral surface 140, the two ends of the first conductive member 230 in the first direction X may be folded to overlap with the second conductive member 240, and are disposed on the first end surface 120 and the second end surface 130 of the main beam body 100. Alternatively, the length of the second conductive member 240 in the first direction X may be greater than that of the first conductive member 230. In this way, when the first conductive member 230 and the second conductive member 240 are sequentially covered on the outer peripheral surface 140, the two ends of the second conductive member 240 in the first direction X may be folded to overlap with the first conductive member 230, and are disposed on the first end surface 120 and the second end surface 130. Of course, the present application is not limited thereto.

[0089] See also Figure 4 and Figure 5In some embodiments, the first conductive member 230 and the second conductive member 240 can be provided in pairs respectively, and the two first conductive members 230 are located on opposite sides of the outer peripheral surface 140, and both ends of the two first conductive members 230 are bent in directions toward each other. The two second conductive members 240 and the two first conductive members 230 are alternately distributed on the outer peripheral surface 140.

[0090] The two first conductive members 230 are located on opposite sides of the outer peripheral surface 140, and the two ends are bent toward each other to facilitate the connection between the first conductive member 230 and the second conductive member 240. This arrangement ensures that when the wind turbine blade is struck by lightning, the current can be quickly and evenly dispersed to multiple conductive paths, thereby reducing the risk of local overheating and damage.

[0091] Among them, the design of two second conductive members 240 and two first conductive members 230 being alternately distributed on the outer peripheral surface 140 enhances the overall electromagnetic shielding effect of the wind turbine blade, effectively reduces the interference of lightning on the wind turbine blade, and ensures the stable operation of the wind turbine blade.

[0092] When installing the first conductive member 230 and the second conductive member 240, see Figure 4 , one of the two first conductive members 230 can be laid first, and the pultruded plate 110 can be stacked on the first conductive member 230. After the pultruded plate 110 is stacked, the other of the two first conductive members 230 can be laid on the pultruded plate 110, and then the two ends of the two first conductive members 230 in the width direction of the pultruded plate 110 can be folded along the thickness direction of the pultruded plate 110, and then the second conductive member 240 can be laid, so that the first conductive member 230 and the second conductive member 240 are overlapped in sequence, and the main beam body 100 is covered in the conductive assembly 200. Alternatively, see Figure 5 , one of the second conductive members 240 can be laid first, and the first conductive members 230 can be overlapped at both ends of the second conductive member 240 along the width direction of the pultruded plate 110, and then the pultruded plate 110 can be stacked on the second conductive member 240. After the pultruded plate 110 is stacked, the two first conductive members 230 are folded along the thickness direction of the pultruded plate 110, and then folded again along the width direction of the pultruded plate 110, and then the other of the two second conductive members 240 is laid on the pultruded plate 110, so that the first conductive member 230 and the second conductive member 240 are overlapped in sequence, and the main beam body 100 is covered in the conductive assembly 200. In addition, the first conductive member 230 and the second conductive member 240 can also be laid when the main beam is formed, and can also be laid when the wind turbine blade shell is laid.

[0093] In a specific implementation, the length of the first conductive member 230 in the first direction X may be greater than that of the second conductive member 240. Thus, when the first conductive member 230 and the second conductive member 240 are sequentially covered on the outer peripheral surface 140, the two ends of the first conductive member 230 in the first direction X may be folded so that the ends of the two first conductive members 230 overlap in correspondence and are disposed on the first end surface 120 and the second end surface 130 of the main beam body 100. Alternatively, the length of the second conductive member 240 in the first direction X may be greater than that of the first conductive member 230. Thus, when the first conductive member 230 and the second conductive member 240 are sequentially covered on the outer peripheral surface 140, the two ends of the second conductive member 240 in the first direction X may be folded so that the ends of the two second conductive members 240 overlap in sequence and are disposed on the first end surface 120 and the second end surface 130. Of course, the present application is not limited thereto.

[0094] See also Figure 6 In some embodiments, the conductive element 220 is spirally wound around the outer peripheral surface 140 in the first direction X.

[0095] It should be noted that the conductive member 220 can be spirally wound around the outer circumferential surface 140 along a first pitch. This arrangement can ensure the guiding effect of the conductive component 200 while also reducing the manufacturing cost of the conductive member 220 .

[0096] See also Figure 7 In some embodiments, the conductive member 220 may be provided in plurality, and at least one of the conductive members 220 is spirally wound on the outer peripheral surface 140 in the first direction X. At least one is extended along a straight track in the first direction X, and the conductive member 220 spirally wound on the outer peripheral surface 140 overlaps the conductive member 220 extending along the straight track in the orthographic projection portion of the outer peripheral surface 140.

[0097] At least one conductive member 220 is spirally wound around the outer peripheral surface 140 along a second pitch, which helps to quickly guide the current to the ground when lightning strikes, effectively reducing the risk of damage to the main beam body 100 caused by lightning.

[0098] At the same time, at least one conductive member 220 is extended along a straight track in the first direction X, and overlaps with the orthographic projection of the spirally wound conductive member 220 on the outer peripheral surface 140, further enhancing the connectivity of the conductive network. The overlapping portion increases the conductive path, which not only improves the lightning protection performance, but also enhances the electromagnetic shielding effect on the main beam body 100, effectively reducing the interference of lightning on the main beam body 100.

[0099] Among them, the second pitch can be set to be greater than the first pitch, that is, in this embodiment, the conductive member 220 is set to be multiple, thereby, the conductive member 220 spirally wound on the outer peripheral surface 140 can appropriately increase the pitch and reduce the manufacturing cost of the conductive member 220.

[0100] When installing the conductive member 220, the main beam body 100 can be lifted by a lifting device to achieve spiral winding of the conductive member 220 on the main beam body 100, or the conductive member 220 can be cut into multiple pieces and spirally wound in sequence, which is not limited in the present application.

[0101] Furthermore, both ends of the conductive member 220 spirally wound around the main beam body 100 can be bent along the thickness direction of the main beam body 100 to form a closed conductive cavity 210, or, both ends of the conductive member 220 extending along a straight line trajectory in the first direction X can be bent along the thickness direction of the main beam body 100 to form a closed conductive cavity 210.

[0102] Based on the above embodiments, see Figure 1 An embodiment of the present application provides a wind turbine blade, including a blade shell 20 and a main beam structure 10 provided in any of the above embodiments, the main beam structure 10 is arranged on the blade shell 20; the blade shell 20 is provided with a metal mesh 21 and a down conductor 22, and the conductive component 200, the metal mesh 21 and the down conductor 22 are connected at the same potential.

[0103] The main beam structure 10 has been described in detail in the above embodiments and will not be described again here.

[0104] In specific implementation, the metal mesh 21 can be set on the outer wall of the blade shell 20, and the down conductor 22 is led out through the interior of the blade shell 20. The main beam structure 10 is set inside the blade shell 20 and is connected to the metal mesh 21 and the down conductor 22 at the same potential through metal connectors. In this way, when a lightning strike occurs, the current flowing through the conductive component 200 can be discharged to the ground through the down conductor 22.

[0105] Based on the above embodiment, an embodiment of the present application provides a wind turbine generator set, including the above wind turbine blade.

[0106] The wind turbine blades have been described in detail in the above embodiments and will not be described again here.

[0107] 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 main beam structure, characterized in that: include: A main beam body (100) comprises a plurality of pultruded plates (110), wherein the plurality of pultruded plates (110) are stacked and arranged, wherein the main beam body (100) extends along a first direction (X) by a predetermined length, and wherein the main beam body (100) has a first end face (120), a second end face (130) opposite to each other along the first direction (X), and an outer peripheral face (140) connected between the first end face (120) and the second end face (130); a conductive component (200) disposed on the main beam body (100) and extending along the first direction (X); the conductive component (200) is surrounded by a conductive cavity (210); the main beam body (100) is accommodated in the conductive cavity (210); and the conductive component (200) is supported by the first end surface (120), the second end surface (130) and the outer peripheral surface (140); The conductive cavity (210) formed by the conductive component (200) is in the shape of a closed cavity outside the main beam body (100), and the main beam body (100) is surrounded by the conductive cavity (210).

2. The main beam structure according to claim 1, characterized in that: The conductive component (200) comprises at least one conductive member (220), and the conductive member (220) comprises at least one of a planar conductive member, a mesh conductive member, a spiral strip conductive member, and a belt conductive member.

3. The main beam structure according to claim 2, characterized in that: The conductive component (200) is arranged around the outer peripheral surface (140), and the conductive component (200) extends along the outer peripheral surface (140) in a closed ring shape.

4. The main beam structure according to claim 3, characterized in that: The conductive component (200) comprises a conductive member (220), wherein the conductive member (220) has a first overlapping portion (221) and a second overlapping portion (222) that are opposite to each other, and an extension length of the conductive member (220) along the outer peripheral surface (140) is greater than a circumference of a corresponding area of ​​the outer peripheral surface (140), and the first overlapping portion (221) and the second overlapping portion (222) are partially overlapped.

5. The main beam structure according to claim 3, characterized in that: The conductive component (200) comprises more than two conductive members (220), and the more than two conductive members (220) are sequentially distributed around the outer peripheral surface (140) and enclose the conductive cavity (210), and two adjacent conductive members (220) are arranged to overlap with one end facing each other.

6. The main beam structure according to claim 5, characterized in that: The conductive component (200) comprises a first conductive member (230) and a second conductive member (240); the first conductive member (230) and the second conductive member (240) are sequentially distributed around the outer peripheral surface (140) and enclose the conductive cavity (210); the first conductive member (230) and the second conductive member (240) are arranged to overlap with one end of each other.

7. The main beam structure according to claim 6, characterized in that: The first conductive member (230) and the second conductive member (240) are each provided as one, the first conductive member (230) extends along the outer peripheral surface (140) to be arranged around at least a portion of the outer peripheral surface (140), and two ends of the first conductive member (230) are arranged to be bent in directions facing each other; The second conductive member (240) is disposed between two ends of the first conductive member (230) and partially overlaps with the first conductive member (230).

8. The main beam structure according to claim 6, characterized in that: The first conductive member (230) and the second conductive member (240) are respectively provided in pairs, the two first conductive members (230) are located on two opposite sides of the outer peripheral surface (140), and both ends of the two first conductive members (230) are bent in directions facing each other; The two second conductive members (240) and the two first conductive members (230) are alternately distributed on the outer peripheral surface (140).

9. The main beam structure according to claim 2, characterized in that: The conductive element (220) is spirally wound around the outer peripheral surface (140) in the first direction (X).

10. The main beam structure according to claim 8, characterized in that: The conductive members (220) are provided in plurality, and at least one of the conductive members (220) is spirally wound on the outer peripheral surface (140) in the first direction (X); At least one of them is extended along a straight track in the first direction (X), and the conductive member (220) spirally wound on the outer peripheral surface (140) overlaps with the conductive member (220) extending along the straight track at the orthographic projection portion of the outer peripheral surface (140).

11. A wind turbine blade, characterized in that: It comprises a blade shell (20) and a main beam structure (10) according to any one of claims 1 to 10, wherein the main beam structure (10) is arranged on the blade shell (20); The blade shell (20) is provided with a metal mesh (21) and a down conductor (22); the conductive component (200), the metal mesh (21) and the down conductor (22) are connected at the same potential.

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

Images